From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Fabian=20Silva=20Delgado?= Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- drivers/gpu/drm/i915/intel_dp.c | 5693 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 5693 insertions(+) create mode 100644 drivers/gpu/drm/i915/intel_dp.c (limited to 'drivers/gpu/drm/i915/intel_dp.c') diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c new file mode 100644 index 000000000..d714a4b57 --- /dev/null +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -0,0 +1,5693 @@ +/* + * Copyright © 2008 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + * + * Authors: + * Keith Packard + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "intel_drv.h" +#include +#include "i915_drv.h" + +#define DP_LINK_CHECK_TIMEOUT (10 * 1000) + +struct dp_link_dpll { + int link_bw; + struct dpll dpll; +}; + +static const struct dp_link_dpll gen4_dpll[] = { + { DP_LINK_BW_1_62, + { .p1 = 2, .p2 = 10, .n = 2, .m1 = 23, .m2 = 8 } }, + { DP_LINK_BW_2_7, + { .p1 = 1, .p2 = 10, .n = 1, .m1 = 14, .m2 = 2 } } +}; + +static const struct dp_link_dpll pch_dpll[] = { + { DP_LINK_BW_1_62, + { .p1 = 2, .p2 = 10, .n = 1, .m1 = 12, .m2 = 9 } }, + { DP_LINK_BW_2_7, + { .p1 = 1, .p2 = 10, .n = 2, .m1 = 14, .m2 = 8 } } +}; + +static const struct dp_link_dpll vlv_dpll[] = { + { DP_LINK_BW_1_62, + { .p1 = 3, .p2 = 2, .n = 5, .m1 = 3, .m2 = 81 } }, + { DP_LINK_BW_2_7, + { .p1 = 2, .p2 = 2, .n = 1, .m1 = 2, .m2 = 27 } } +}; + +/* + * CHV supports eDP 1.4 that have more link rates. + * Below only provides the fixed rate but exclude variable rate. + */ +static const struct dp_link_dpll chv_dpll[] = { + /* + * CHV requires to program fractional division for m2. + * m2 is stored in fixed point format using formula below + * (m2_int << 22) | m2_fraction + */ + { DP_LINK_BW_1_62, /* m2_int = 32, m2_fraction = 1677722 */ + { .p1 = 4, .p2 = 2, .n = 1, .m1 = 2, .m2 = 0x819999a } }, + { DP_LINK_BW_2_7, /* m2_int = 27, m2_fraction = 0 */ + { .p1 = 4, .p2 = 1, .n = 1, .m1 = 2, .m2 = 0x6c00000 } }, + { DP_LINK_BW_5_4, /* m2_int = 27, m2_fraction = 0 */ + { .p1 = 2, .p2 = 1, .n = 1, .m1 = 2, .m2 = 0x6c00000 } } +}; +/* Skylake supports following rates */ +static const int gen9_rates[] = { 162000, 216000, 270000, + 324000, 432000, 540000 }; +static const int chv_rates[] = { 162000, 202500, 210000, 216000, + 243000, 270000, 324000, 405000, + 420000, 432000, 540000 }; +static const int default_rates[] = { 162000, 270000, 540000 }; + +/** + * is_edp - is the given port attached to an eDP panel (either CPU or PCH) + * @intel_dp: DP struct + * + * If a CPU or PCH DP output is attached to an eDP panel, this function + * will return true, and false otherwise. + */ +static bool is_edp(struct intel_dp *intel_dp) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + + return intel_dig_port->base.type == INTEL_OUTPUT_EDP; +} + +static struct drm_device *intel_dp_to_dev(struct intel_dp *intel_dp) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + + return intel_dig_port->base.base.dev; +} + +static struct intel_dp *intel_attached_dp(struct drm_connector *connector) +{ + return enc_to_intel_dp(&intel_attached_encoder(connector)->base); +} + +static void intel_dp_link_down(struct intel_dp *intel_dp); +static bool edp_panel_vdd_on(struct intel_dp *intel_dp); +static void edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync); +static void vlv_init_panel_power_sequencer(struct intel_dp *intel_dp); +static void vlv_steal_power_sequencer(struct drm_device *dev, + enum pipe pipe); + +static int +intel_dp_max_link_bw(struct intel_dp *intel_dp) +{ + int max_link_bw = intel_dp->dpcd[DP_MAX_LINK_RATE]; + + switch (max_link_bw) { + case DP_LINK_BW_1_62: + case DP_LINK_BW_2_7: + case DP_LINK_BW_5_4: + break; + default: + WARN(1, "invalid max DP link bw val %x, using 1.62Gbps\n", + max_link_bw); + max_link_bw = DP_LINK_BW_1_62; + break; + } + return max_link_bw; +} + +static u8 intel_dp_max_lane_count(struct intel_dp *intel_dp) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct drm_device *dev = intel_dig_port->base.base.dev; + u8 source_max, sink_max; + + source_max = 4; + if (HAS_DDI(dev) && intel_dig_port->port == PORT_A && + (intel_dig_port->saved_port_bits & DDI_A_4_LANES) == 0) + source_max = 2; + + sink_max = drm_dp_max_lane_count(intel_dp->dpcd); + + return min(source_max, sink_max); +} + +/* + * The units on the numbers in the next two are... bizarre. Examples will + * make it clearer; this one parallels an example in the eDP spec. + * + * intel_dp_max_data_rate for one lane of 2.7GHz evaluates as: + * + * 270000 * 1 * 8 / 10 == 216000 + * + * The actual data capacity of that configuration is 2.16Gbit/s, so the + * units are decakilobits. ->clock in a drm_display_mode is in kilohertz - + * or equivalently, kilopixels per second - so for 1680x1050R it'd be + * 119000. At 18bpp that's 2142000 kilobits per second. + * + * Thus the strange-looking division by 10 in intel_dp_link_required, to + * get the result in decakilobits instead of kilobits. + */ + +static int +intel_dp_link_required(int pixel_clock, int bpp) +{ + return (pixel_clock * bpp + 9) / 10; +} + +static int +intel_dp_max_data_rate(int max_link_clock, int max_lanes) +{ + return (max_link_clock * max_lanes * 8) / 10; +} + +static enum drm_mode_status +intel_dp_mode_valid(struct drm_connector *connector, + struct drm_display_mode *mode) +{ + struct intel_dp *intel_dp = intel_attached_dp(connector); + struct intel_connector *intel_connector = to_intel_connector(connector); + struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode; + int target_clock = mode->clock; + int max_rate, mode_rate, max_lanes, max_link_clock; + + if (is_edp(intel_dp) && fixed_mode) { + if (mode->hdisplay > fixed_mode->hdisplay) + return MODE_PANEL; + + if (mode->vdisplay > fixed_mode->vdisplay) + return MODE_PANEL; + + target_clock = fixed_mode->clock; + } + + max_link_clock = intel_dp_max_link_rate(intel_dp); + max_lanes = intel_dp_max_lane_count(intel_dp); + + max_rate = intel_dp_max_data_rate(max_link_clock, max_lanes); + mode_rate = intel_dp_link_required(target_clock, 18); + + if (mode_rate > max_rate) + return MODE_CLOCK_HIGH; + + if (mode->clock < 10000) + return MODE_CLOCK_LOW; + + if (mode->flags & DRM_MODE_FLAG_DBLCLK) + return MODE_H_ILLEGAL; + + return MODE_OK; +} + +uint32_t intel_dp_pack_aux(const uint8_t *src, int src_bytes) +{ + int i; + uint32_t v = 0; + + if (src_bytes > 4) + src_bytes = 4; + for (i = 0; i < src_bytes; i++) + v |= ((uint32_t) src[i]) << ((3-i) * 8); + return v; +} + +static void intel_dp_unpack_aux(uint32_t src, uint8_t *dst, int dst_bytes) +{ + int i; + if (dst_bytes > 4) + dst_bytes = 4; + for (i = 0; i < dst_bytes; i++) + dst[i] = src >> ((3-i) * 8); +} + +/* hrawclock is 1/4 the FSB frequency */ +static int +intel_hrawclk(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + uint32_t clkcfg; + + /* There is no CLKCFG reg in Valleyview. VLV hrawclk is 200 MHz */ + if (IS_VALLEYVIEW(dev)) + return 200; + + clkcfg = I915_READ(CLKCFG); + switch (clkcfg & CLKCFG_FSB_MASK) { + case CLKCFG_FSB_400: + return 100; + case CLKCFG_FSB_533: + return 133; + case CLKCFG_FSB_667: + return 166; + case CLKCFG_FSB_800: + return 200; + case CLKCFG_FSB_1067: + return 266; + case CLKCFG_FSB_1333: + return 333; + /* these two are just a guess; one of them might be right */ + case CLKCFG_FSB_1600: + case CLKCFG_FSB_1600_ALT: + return 400; + default: + return 133; + } +} + +static void +intel_dp_init_panel_power_sequencer(struct drm_device *dev, + struct intel_dp *intel_dp); +static void +intel_dp_init_panel_power_sequencer_registers(struct drm_device *dev, + struct intel_dp *intel_dp); + +static void pps_lock(struct intel_dp *intel_dp) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct intel_encoder *encoder = &intel_dig_port->base; + struct drm_device *dev = encoder->base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + enum intel_display_power_domain power_domain; + + /* + * See vlv_power_sequencer_reset() why we need + * a power domain reference here. + */ + power_domain = intel_display_port_power_domain(encoder); + intel_display_power_get(dev_priv, power_domain); + + mutex_lock(&dev_priv->pps_mutex); +} + +static void pps_unlock(struct intel_dp *intel_dp) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct intel_encoder *encoder = &intel_dig_port->base; + struct drm_device *dev = encoder->base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + enum intel_display_power_domain power_domain; + + mutex_unlock(&dev_priv->pps_mutex); + + power_domain = intel_display_port_power_domain(encoder); + intel_display_power_put(dev_priv, power_domain); +} + +static void +vlv_power_sequencer_kick(struct intel_dp *intel_dp) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct drm_device *dev = intel_dig_port->base.base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + enum pipe pipe = intel_dp->pps_pipe; + bool pll_enabled; + uint32_t DP; + + if (WARN(I915_READ(intel_dp->output_reg) & DP_PORT_EN, + "skipping pipe %c power seqeuncer kick due to port %c being active\n", + pipe_name(pipe), port_name(intel_dig_port->port))) + return; + + DRM_DEBUG_KMS("kicking pipe %c power sequencer for port %c\n", + pipe_name(pipe), port_name(intel_dig_port->port)); + + /* Preserve the BIOS-computed detected bit. This is + * supposed to be read-only. + */ + DP = I915_READ(intel_dp->output_reg) & DP_DETECTED; + DP |= DP_VOLTAGE_0_4 | DP_PRE_EMPHASIS_0; + DP |= DP_PORT_WIDTH(1); + DP |= DP_LINK_TRAIN_PAT_1; + + if (IS_CHERRYVIEW(dev)) + DP |= DP_PIPE_SELECT_CHV(pipe); + else if (pipe == PIPE_B) + DP |= DP_PIPEB_SELECT; + + pll_enabled = I915_READ(DPLL(pipe)) & DPLL_VCO_ENABLE; + + /* + * The DPLL for the pipe must be enabled for this to work. + * So enable temporarily it if it's not already enabled. + */ + if (!pll_enabled) + vlv_force_pll_on(dev, pipe, IS_CHERRYVIEW(dev) ? + &chv_dpll[0].dpll : &vlv_dpll[0].dpll); + + /* + * Similar magic as in intel_dp_enable_port(). + * We _must_ do this port enable + disable trick + * to make this power seqeuencer lock onto the port. + * Otherwise even VDD force bit won't work. + */ + I915_WRITE(intel_dp->output_reg, DP); + POSTING_READ(intel_dp->output_reg); + + I915_WRITE(intel_dp->output_reg, DP | DP_PORT_EN); + POSTING_READ(intel_dp->output_reg); + + I915_WRITE(intel_dp->output_reg, DP & ~DP_PORT_EN); + POSTING_READ(intel_dp->output_reg); + + if (!pll_enabled) + vlv_force_pll_off(dev, pipe); +} + +static enum pipe +vlv_power_sequencer_pipe(struct intel_dp *intel_dp) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct drm_device *dev = intel_dig_port->base.base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_encoder *encoder; + unsigned int pipes = (1 << PIPE_A) | (1 << PIPE_B); + enum pipe pipe; + + lockdep_assert_held(&dev_priv->pps_mutex); + + /* We should never land here with regular DP ports */ + WARN_ON(!is_edp(intel_dp)); + + if (intel_dp->pps_pipe != INVALID_PIPE) + return intel_dp->pps_pipe; + + /* + * We don't have power sequencer currently. + * Pick one that's not used by other ports. + */ + list_for_each_entry(encoder, &dev->mode_config.encoder_list, + base.head) { + struct intel_dp *tmp; + + if (encoder->type != INTEL_OUTPUT_EDP) + continue; + + tmp = enc_to_intel_dp(&encoder->base); + + if (tmp->pps_pipe != INVALID_PIPE) + pipes &= ~(1 << tmp->pps_pipe); + } + + /* + * Didn't find one. This should not happen since there + * are two power sequencers and up to two eDP ports. + */ + if (WARN_ON(pipes == 0)) + pipe = PIPE_A; + else + pipe = ffs(pipes) - 1; + + vlv_steal_power_sequencer(dev, pipe); + intel_dp->pps_pipe = pipe; + + DRM_DEBUG_KMS("picked pipe %c power sequencer for port %c\n", + pipe_name(intel_dp->pps_pipe), + port_name(intel_dig_port->port)); + + /* init power sequencer on this pipe and port */ + intel_dp_init_panel_power_sequencer(dev, intel_dp); + intel_dp_init_panel_power_sequencer_registers(dev, intel_dp); + + /* + * Even vdd force doesn't work until we've made + * the power sequencer lock in on the port. + */ + vlv_power_sequencer_kick(intel_dp); + + return intel_dp->pps_pipe; +} + +typedef bool (*vlv_pipe_check)(struct drm_i915_private *dev_priv, + enum pipe pipe); + +static bool vlv_pipe_has_pp_on(struct drm_i915_private *dev_priv, + enum pipe pipe) +{ + return I915_READ(VLV_PIPE_PP_STATUS(pipe)) & PP_ON; +} + +static bool vlv_pipe_has_vdd_on(struct drm_i915_private *dev_priv, + enum pipe pipe) +{ + return I915_READ(VLV_PIPE_PP_CONTROL(pipe)) & EDP_FORCE_VDD; +} + +static bool vlv_pipe_any(struct drm_i915_private *dev_priv, + enum pipe pipe) +{ + return true; +} + +static enum pipe +vlv_initial_pps_pipe(struct drm_i915_private *dev_priv, + enum port port, + vlv_pipe_check pipe_check) +{ + enum pipe pipe; + + for (pipe = PIPE_A; pipe <= PIPE_B; pipe++) { + u32 port_sel = I915_READ(VLV_PIPE_PP_ON_DELAYS(pipe)) & + PANEL_PORT_SELECT_MASK; + + if (port_sel != PANEL_PORT_SELECT_VLV(port)) + continue; + + if (!pipe_check(dev_priv, pipe)) + continue; + + return pipe; + } + + return INVALID_PIPE; +} + +static void +vlv_initial_power_sequencer_setup(struct intel_dp *intel_dp) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct drm_device *dev = intel_dig_port->base.base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + enum port port = intel_dig_port->port; + + lockdep_assert_held(&dev_priv->pps_mutex); + + /* try to find a pipe with this port selected */ + /* first pick one where the panel is on */ + intel_dp->pps_pipe = vlv_initial_pps_pipe(dev_priv, port, + vlv_pipe_has_pp_on); + /* didn't find one? pick one where vdd is on */ + if (intel_dp->pps_pipe == INVALID_PIPE) + intel_dp->pps_pipe = vlv_initial_pps_pipe(dev_priv, port, + vlv_pipe_has_vdd_on); + /* didn't find one? pick one with just the correct port */ + if (intel_dp->pps_pipe == INVALID_PIPE) + intel_dp->pps_pipe = vlv_initial_pps_pipe(dev_priv, port, + vlv_pipe_any); + + /* didn't find one? just let vlv_power_sequencer_pipe() pick one when needed */ + if (intel_dp->pps_pipe == INVALID_PIPE) { + DRM_DEBUG_KMS("no initial power sequencer for port %c\n", + port_name(port)); + return; + } + + DRM_DEBUG_KMS("initial power sequencer for port %c: pipe %c\n", + port_name(port), pipe_name(intel_dp->pps_pipe)); + + intel_dp_init_panel_power_sequencer(dev, intel_dp); + intel_dp_init_panel_power_sequencer_registers(dev, intel_dp); +} + +void vlv_power_sequencer_reset(struct drm_i915_private *dev_priv) +{ + struct drm_device *dev = dev_priv->dev; + struct intel_encoder *encoder; + + if (WARN_ON(!IS_VALLEYVIEW(dev))) + return; + + /* + * We can't grab pps_mutex here due to deadlock with power_domain + * mutex when power_domain functions are called while holding pps_mutex. + * That also means that in order to use pps_pipe the code needs to + * hold both a power domain reference and pps_mutex, and the power domain + * reference get/put must be done while _not_ holding pps_mutex. + * pps_{lock,unlock}() do these steps in the correct order, so one + * should use them always. + */ + + list_for_each_entry(encoder, &dev->mode_config.encoder_list, base.head) { + struct intel_dp *intel_dp; + + if (encoder->type != INTEL_OUTPUT_EDP) + continue; + + intel_dp = enc_to_intel_dp(&encoder->base); + intel_dp->pps_pipe = INVALID_PIPE; + } +} + +static u32 _pp_ctrl_reg(struct intel_dp *intel_dp) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + + if (HAS_PCH_SPLIT(dev)) + return PCH_PP_CONTROL; + else + return VLV_PIPE_PP_CONTROL(vlv_power_sequencer_pipe(intel_dp)); +} + +static u32 _pp_stat_reg(struct intel_dp *intel_dp) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + + if (HAS_PCH_SPLIT(dev)) + return PCH_PP_STATUS; + else + return VLV_PIPE_PP_STATUS(vlv_power_sequencer_pipe(intel_dp)); +} + +/* Reboot notifier handler to shutdown panel power to guarantee T12 timing + This function only applicable when panel PM state is not to be tracked */ +static int edp_notify_handler(struct notifier_block *this, unsigned long code, + void *unused) +{ + struct intel_dp *intel_dp = container_of(this, typeof(* intel_dp), + edp_notifier); + struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct drm_i915_private *dev_priv = dev->dev_private; + u32 pp_div; + u32 pp_ctrl_reg, pp_div_reg; + + if (!is_edp(intel_dp) || code != SYS_RESTART) + return 0; + + pps_lock(intel_dp); + + if (IS_VALLEYVIEW(dev)) { + enum pipe pipe = vlv_power_sequencer_pipe(intel_dp); + + pp_ctrl_reg = VLV_PIPE_PP_CONTROL(pipe); + pp_div_reg = VLV_PIPE_PP_DIVISOR(pipe); + pp_div = I915_READ(pp_div_reg); + pp_div &= PP_REFERENCE_DIVIDER_MASK; + + /* 0x1F write to PP_DIV_REG sets max cycle delay */ + I915_WRITE(pp_div_reg, pp_div | 0x1F); + I915_WRITE(pp_ctrl_reg, PANEL_UNLOCK_REGS | PANEL_POWER_OFF); + msleep(intel_dp->panel_power_cycle_delay); + } + + pps_unlock(intel_dp); + + return 0; +} + +static bool edp_have_panel_power(struct intel_dp *intel_dp) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct drm_i915_private *dev_priv = dev->dev_private; + + lockdep_assert_held(&dev_priv->pps_mutex); + + if (IS_VALLEYVIEW(dev) && + intel_dp->pps_pipe == INVALID_PIPE) + return false; + + return (I915_READ(_pp_stat_reg(intel_dp)) & PP_ON) != 0; +} + +static bool edp_have_panel_vdd(struct intel_dp *intel_dp) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct drm_i915_private *dev_priv = dev->dev_private; + + lockdep_assert_held(&dev_priv->pps_mutex); + + if (IS_VALLEYVIEW(dev) && + intel_dp->pps_pipe == INVALID_PIPE) + return false; + + return I915_READ(_pp_ctrl_reg(intel_dp)) & EDP_FORCE_VDD; +} + +static void +intel_dp_check_edp(struct intel_dp *intel_dp) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct drm_i915_private *dev_priv = dev->dev_private; + + if (!is_edp(intel_dp)) + return; + + if (!edp_have_panel_power(intel_dp) && !edp_have_panel_vdd(intel_dp)) { + WARN(1, "eDP powered off while attempting aux channel communication.\n"); + DRM_DEBUG_KMS("Status 0x%08x Control 0x%08x\n", + I915_READ(_pp_stat_reg(intel_dp)), + I915_READ(_pp_ctrl_reg(intel_dp))); + } +} + +static uint32_t +intel_dp_aux_wait_done(struct intel_dp *intel_dp, bool has_aux_irq) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct drm_device *dev = intel_dig_port->base.base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + uint32_t ch_ctl = intel_dp->aux_ch_ctl_reg; + uint32_t status; + bool done; + +#define C (((status = I915_READ_NOTRACE(ch_ctl)) & DP_AUX_CH_CTL_SEND_BUSY) == 0) + if (has_aux_irq) + done = wait_event_timeout(dev_priv->gmbus_wait_queue, C, + msecs_to_jiffies_timeout(10)); + else + done = wait_for_atomic(C, 10) == 0; + if (!done) + DRM_ERROR("dp aux hw did not signal timeout (has irq: %i)!\n", + has_aux_irq); +#undef C + + return status; +} + +static uint32_t i9xx_get_aux_clock_divider(struct intel_dp *intel_dp, int index) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct drm_device *dev = intel_dig_port->base.base.dev; + + /* + * The clock divider is based off the hrawclk, and would like to run at + * 2MHz. So, take the hrawclk value and divide by 2 and use that + */ + return index ? 0 : intel_hrawclk(dev) / 2; +} + +static uint32_t ilk_get_aux_clock_divider(struct intel_dp *intel_dp, int index) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct drm_device *dev = intel_dig_port->base.base.dev; + + if (index) + return 0; + + if (intel_dig_port->port == PORT_A) { + if (IS_GEN6(dev) || IS_GEN7(dev)) + return 200; /* SNB & IVB eDP input clock at 400Mhz */ + else + return 225; /* eDP input clock at 450Mhz */ + } else { + return DIV_ROUND_UP(intel_pch_rawclk(dev), 2); + } +} + +static uint32_t hsw_get_aux_clock_divider(struct intel_dp *intel_dp, int index) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct drm_device *dev = intel_dig_port->base.base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + + if (intel_dig_port->port == PORT_A) { + if (index) + return 0; + return DIV_ROUND_CLOSEST(intel_ddi_get_cdclk_freq(dev_priv), 2000); + } else if (dev_priv->pch_id == INTEL_PCH_LPT_DEVICE_ID_TYPE) { + /* Workaround for non-ULT HSW */ + switch (index) { + case 0: return 63; + case 1: return 72; + default: return 0; + } + } else { + return index ? 0 : DIV_ROUND_UP(intel_pch_rawclk(dev), 2); + } +} + +static uint32_t vlv_get_aux_clock_divider(struct intel_dp *intel_dp, int index) +{ + return index ? 0 : 100; +} + +static uint32_t skl_get_aux_clock_divider(struct intel_dp *intel_dp, int index) +{ + /* + * SKL doesn't need us to program the AUX clock divider (Hardware will + * derive the clock from CDCLK automatically). We still implement the + * get_aux_clock_divider vfunc to plug-in into the existing code. + */ + return index ? 0 : 1; +} + +static uint32_t i9xx_get_aux_send_ctl(struct intel_dp *intel_dp, + bool has_aux_irq, + int send_bytes, + uint32_t aux_clock_divider) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct drm_device *dev = intel_dig_port->base.base.dev; + uint32_t precharge, timeout; + + if (IS_GEN6(dev)) + precharge = 3; + else + precharge = 5; + + if (IS_BROADWELL(dev) && intel_dp->aux_ch_ctl_reg == DPA_AUX_CH_CTL) + timeout = DP_AUX_CH_CTL_TIME_OUT_600us; + else + timeout = DP_AUX_CH_CTL_TIME_OUT_400us; + + return DP_AUX_CH_CTL_SEND_BUSY | + DP_AUX_CH_CTL_DONE | + (has_aux_irq ? DP_AUX_CH_CTL_INTERRUPT : 0) | + DP_AUX_CH_CTL_TIME_OUT_ERROR | + timeout | + DP_AUX_CH_CTL_RECEIVE_ERROR | + (send_bytes << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) | + (precharge << DP_AUX_CH_CTL_PRECHARGE_2US_SHIFT) | + (aux_clock_divider << DP_AUX_CH_CTL_BIT_CLOCK_2X_SHIFT); +} + +static uint32_t skl_get_aux_send_ctl(struct intel_dp *intel_dp, + bool has_aux_irq, + int send_bytes, + uint32_t unused) +{ + return DP_AUX_CH_CTL_SEND_BUSY | + DP_AUX_CH_CTL_DONE | + (has_aux_irq ? DP_AUX_CH_CTL_INTERRUPT : 0) | + DP_AUX_CH_CTL_TIME_OUT_ERROR | + DP_AUX_CH_CTL_TIME_OUT_1600us | + DP_AUX_CH_CTL_RECEIVE_ERROR | + (send_bytes << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) | + DP_AUX_CH_CTL_SYNC_PULSE_SKL(32); +} + +static int +intel_dp_aux_ch(struct intel_dp *intel_dp, + const uint8_t *send, int send_bytes, + uint8_t *recv, int recv_size) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct drm_device *dev = intel_dig_port->base.base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + uint32_t ch_ctl = intel_dp->aux_ch_ctl_reg; + uint32_t ch_data = ch_ctl + 4; + uint32_t aux_clock_divider; + int i, ret, recv_bytes; + uint32_t status; + int try, clock = 0; + bool has_aux_irq = HAS_AUX_IRQ(dev); + bool vdd; + + pps_lock(intel_dp); + + /* + * We will be called with VDD already enabled for dpcd/edid/oui reads. + * In such cases we want to leave VDD enabled and it's up to upper layers + * to turn it off. But for eg. i2c-dev access we need to turn it on/off + * ourselves. + */ + vdd = edp_panel_vdd_on(intel_dp); + + /* dp aux is extremely sensitive to irq latency, hence request the + * lowest possible wakeup latency and so prevent the cpu from going into + * deep sleep states. + */ + pm_qos_update_request(&dev_priv->pm_qos, 0); + + intel_dp_check_edp(intel_dp); + + intel_aux_display_runtime_get(dev_priv); + + /* Try to wait for any previous AUX channel activity */ + for (try = 0; try < 3; try++) { + status = I915_READ_NOTRACE(ch_ctl); + if ((status & DP_AUX_CH_CTL_SEND_BUSY) == 0) + break; + msleep(1); + } + + if (try == 3) { + WARN(1, "dp_aux_ch not started status 0x%08x\n", + I915_READ(ch_ctl)); + ret = -EBUSY; + goto out; + } + + /* Only 5 data registers! */ + if (WARN_ON(send_bytes > 20 || recv_size > 20)) { + ret = -E2BIG; + goto out; + } + + while ((aux_clock_divider = intel_dp->get_aux_clock_divider(intel_dp, clock++))) { + u32 send_ctl = intel_dp->get_aux_send_ctl(intel_dp, + has_aux_irq, + send_bytes, + aux_clock_divider); + + /* Must try at least 3 times according to DP spec */ + for (try = 0; try < 5; try++) { + /* Load the send data into the aux channel data registers */ + for (i = 0; i < send_bytes; i += 4) + I915_WRITE(ch_data + i, + intel_dp_pack_aux(send + i, + send_bytes - i)); + + /* Send the command and wait for it to complete */ + I915_WRITE(ch_ctl, send_ctl); + + status = intel_dp_aux_wait_done(intel_dp, has_aux_irq); + + /* Clear done status and any errors */ + I915_WRITE(ch_ctl, + status | + DP_AUX_CH_CTL_DONE | + DP_AUX_CH_CTL_TIME_OUT_ERROR | + DP_AUX_CH_CTL_RECEIVE_ERROR); + + if (status & (DP_AUX_CH_CTL_TIME_OUT_ERROR | + DP_AUX_CH_CTL_RECEIVE_ERROR)) + continue; + if (status & DP_AUX_CH_CTL_DONE) + goto done; + } + } + + if ((status & DP_AUX_CH_CTL_DONE) == 0) { + DRM_ERROR("dp_aux_ch not done status 0x%08x\n", status); + ret = -EBUSY; + goto out; + } + +done: + /* Check for timeout or receive error. + * Timeouts occur when the sink is not connected + */ + if (status & DP_AUX_CH_CTL_RECEIVE_ERROR) { + DRM_ERROR("dp_aux_ch receive error status 0x%08x\n", status); + ret = -EIO; + goto out; + } + + /* Timeouts occur when the device isn't connected, so they're + * "normal" -- don't fill the kernel log with these */ + if (status & DP_AUX_CH_CTL_TIME_OUT_ERROR) { + DRM_DEBUG_KMS("dp_aux_ch timeout status 0x%08x\n", status); + ret = -ETIMEDOUT; + goto out; + } + + /* Unload any bytes sent back from the other side */ + recv_bytes = ((status & DP_AUX_CH_CTL_MESSAGE_SIZE_MASK) >> + DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT); + if (recv_bytes > recv_size) + recv_bytes = recv_size; + + for (i = 0; i < recv_bytes; i += 4) + intel_dp_unpack_aux(I915_READ(ch_data + i), + recv + i, recv_bytes - i); + + ret = recv_bytes; +out: + pm_qos_update_request(&dev_priv->pm_qos, PM_QOS_DEFAULT_VALUE); + intel_aux_display_runtime_put(dev_priv); + + if (vdd) + edp_panel_vdd_off(intel_dp, false); + + pps_unlock(intel_dp); + + return ret; +} + +#define BARE_ADDRESS_SIZE 3 +#define HEADER_SIZE (BARE_ADDRESS_SIZE + 1) +static ssize_t +intel_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) +{ + struct intel_dp *intel_dp = container_of(aux, struct intel_dp, aux); + uint8_t txbuf[20], rxbuf[20]; + size_t txsize, rxsize; + int ret; + + txbuf[0] = (msg->request << 4) | + ((msg->address >> 16) & 0xf); + txbuf[1] = (msg->address >> 8) & 0xff; + txbuf[2] = msg->address & 0xff; + txbuf[3] = msg->size - 1; + + switch (msg->request & ~DP_AUX_I2C_MOT) { + case DP_AUX_NATIVE_WRITE: + case DP_AUX_I2C_WRITE: + txsize = msg->size ? HEADER_SIZE + msg->size : BARE_ADDRESS_SIZE; + rxsize = 2; /* 0 or 1 data bytes */ + + if (WARN_ON(txsize > 20)) + return -E2BIG; + + memcpy(txbuf + HEADER_SIZE, msg->buffer, msg->size); + + ret = intel_dp_aux_ch(intel_dp, txbuf, txsize, rxbuf, rxsize); + if (ret > 0) { + msg->reply = rxbuf[0] >> 4; + + if (ret > 1) { + /* Number of bytes written in a short write. */ + ret = clamp_t(int, rxbuf[1], 0, msg->size); + } else { + /* Return payload size. */ + ret = msg->size; + } + } + break; + + case DP_AUX_NATIVE_READ: + case DP_AUX_I2C_READ: + txsize = msg->size ? HEADER_SIZE : BARE_ADDRESS_SIZE; + rxsize = msg->size + 1; + + if (WARN_ON(rxsize > 20)) + return -E2BIG; + + ret = intel_dp_aux_ch(intel_dp, txbuf, txsize, rxbuf, rxsize); + if (ret > 0) { + msg->reply = rxbuf[0] >> 4; + /* + * Assume happy day, and copy the data. The caller is + * expected to check msg->reply before touching it. + * + * Return payload size. + */ + ret--; + memcpy(msg->buffer, rxbuf + 1, ret); + } + break; + + default: + ret = -EINVAL; + break; + } + + return ret; +} + +static void +intel_dp_aux_init(struct intel_dp *intel_dp, struct intel_connector *connector) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + enum port port = intel_dig_port->port; + const char *name = NULL; + int ret; + + switch (port) { + case PORT_A: + intel_dp->aux_ch_ctl_reg = DPA_AUX_CH_CTL; + name = "DPDDC-A"; + break; + case PORT_B: + intel_dp->aux_ch_ctl_reg = PCH_DPB_AUX_CH_CTL; + name = "DPDDC-B"; + break; + case PORT_C: + intel_dp->aux_ch_ctl_reg = PCH_DPC_AUX_CH_CTL; + name = "DPDDC-C"; + break; + case PORT_D: + intel_dp->aux_ch_ctl_reg = PCH_DPD_AUX_CH_CTL; + name = "DPDDC-D"; + break; + default: + BUG(); + } + + /* + * The AUX_CTL register is usually DP_CTL + 0x10. + * + * On Haswell and Broadwell though: + * - Both port A DDI_BUF_CTL and DDI_AUX_CTL are on the CPU + * - Port B/C/D AUX channels are on the PCH, DDI_BUF_CTL on the CPU + * + * Skylake moves AUX_CTL back next to DDI_BUF_CTL, on the CPU. + */ + if (!IS_HASWELL(dev) && !IS_BROADWELL(dev)) + intel_dp->aux_ch_ctl_reg = intel_dp->output_reg + 0x10; + + intel_dp->aux.name = name; + intel_dp->aux.dev = dev->dev; + intel_dp->aux.transfer = intel_dp_aux_transfer; + + DRM_DEBUG_KMS("registering %s bus for %s\n", name, + connector->base.kdev->kobj.name); + + ret = drm_dp_aux_register(&intel_dp->aux); + if (ret < 0) { + DRM_ERROR("drm_dp_aux_register() for %s failed (%d)\n", + name, ret); + return; + } + + ret = sysfs_create_link(&connector->base.kdev->kobj, + &intel_dp->aux.ddc.dev.kobj, + intel_dp->aux.ddc.dev.kobj.name); + if (ret < 0) { + DRM_ERROR("sysfs_create_link() for %s failed (%d)\n", name, ret); + drm_dp_aux_unregister(&intel_dp->aux); + } +} + +static void +intel_dp_connector_unregister(struct intel_connector *intel_connector) +{ + struct intel_dp *intel_dp = intel_attached_dp(&intel_connector->base); + + if (!intel_connector->mst_port) + sysfs_remove_link(&intel_connector->base.kdev->kobj, + intel_dp->aux.ddc.dev.kobj.name); + intel_connector_unregister(intel_connector); +} + +static void +skl_edp_set_pll_config(struct intel_crtc_state *pipe_config, int link_clock) +{ + u32 ctrl1; + + pipe_config->ddi_pll_sel = SKL_DPLL0; + pipe_config->dpll_hw_state.cfgcr1 = 0; + pipe_config->dpll_hw_state.cfgcr2 = 0; + + ctrl1 = DPLL_CTRL1_OVERRIDE(SKL_DPLL0); + switch (link_clock / 2) { + case 81000: + ctrl1 |= DPLL_CRTL1_LINK_RATE(DPLL_CRTL1_LINK_RATE_810, + SKL_DPLL0); + break; + case 135000: + ctrl1 |= DPLL_CRTL1_LINK_RATE(DPLL_CRTL1_LINK_RATE_1350, + SKL_DPLL0); + break; + case 270000: + ctrl1 |= DPLL_CRTL1_LINK_RATE(DPLL_CRTL1_LINK_RATE_2700, + SKL_DPLL0); + break; + case 162000: + ctrl1 |= DPLL_CRTL1_LINK_RATE(DPLL_CRTL1_LINK_RATE_1620, + SKL_DPLL0); + break; + /* TBD: For DP link rates 2.16 GHz and 4.32 GHz, VCO is 8640 which + results in CDCLK change. Need to handle the change of CDCLK by + disabling pipes and re-enabling them */ + case 108000: + ctrl1 |= DPLL_CRTL1_LINK_RATE(DPLL_CRTL1_LINK_RATE_1080, + SKL_DPLL0); + break; + case 216000: + ctrl1 |= DPLL_CRTL1_LINK_RATE(DPLL_CRTL1_LINK_RATE_2160, + SKL_DPLL0); + break; + + } + pipe_config->dpll_hw_state.ctrl1 = ctrl1; +} + +static void +hsw_dp_set_ddi_pll_sel(struct intel_crtc_state *pipe_config, int link_bw) +{ + switch (link_bw) { + case DP_LINK_BW_1_62: + pipe_config->ddi_pll_sel = PORT_CLK_SEL_LCPLL_810; + break; + case DP_LINK_BW_2_7: + pipe_config->ddi_pll_sel = PORT_CLK_SEL_LCPLL_1350; + break; + case DP_LINK_BW_5_4: + pipe_config->ddi_pll_sel = PORT_CLK_SEL_LCPLL_2700; + break; + } +} + +static int +intel_dp_sink_rates(struct intel_dp *intel_dp, const int **sink_rates) +{ + if (intel_dp->num_sink_rates) { + *sink_rates = intel_dp->sink_rates; + return intel_dp->num_sink_rates; + } + + *sink_rates = default_rates; + + return (intel_dp_max_link_bw(intel_dp) >> 3) + 1; +} + +static int +intel_dp_source_rates(struct drm_device *dev, const int **source_rates) +{ + if (INTEL_INFO(dev)->gen >= 9) { + *source_rates = gen9_rates; + return ARRAY_SIZE(gen9_rates); + } else if (IS_CHERRYVIEW(dev)) { + *source_rates = chv_rates; + return ARRAY_SIZE(chv_rates); + } + + *source_rates = default_rates; + + if (IS_SKYLAKE(dev) && INTEL_REVID(dev) <= SKL_REVID_B0) + /* WaDisableHBR2:skl */ + return (DP_LINK_BW_2_7 >> 3) + 1; + else if (INTEL_INFO(dev)->gen >= 8 || + (IS_HASWELL(dev) && !IS_HSW_ULX(dev))) + return (DP_LINK_BW_5_4 >> 3) + 1; + else + return (DP_LINK_BW_2_7 >> 3) + 1; +} + +static void +intel_dp_set_clock(struct intel_encoder *encoder, + struct intel_crtc_state *pipe_config, int link_bw) +{ + struct drm_device *dev = encoder->base.dev; + const struct dp_link_dpll *divisor = NULL; + int i, count = 0; + + if (IS_G4X(dev)) { + divisor = gen4_dpll; + count = ARRAY_SIZE(gen4_dpll); + } else if (HAS_PCH_SPLIT(dev)) { + divisor = pch_dpll; + count = ARRAY_SIZE(pch_dpll); + } else if (IS_CHERRYVIEW(dev)) { + divisor = chv_dpll; + count = ARRAY_SIZE(chv_dpll); + } else if (IS_VALLEYVIEW(dev)) { + divisor = vlv_dpll; + count = ARRAY_SIZE(vlv_dpll); + } + + if (divisor && count) { + for (i = 0; i < count; i++) { + if (link_bw == divisor[i].link_bw) { + pipe_config->dpll = divisor[i].dpll; + pipe_config->clock_set = true; + break; + } + } + } +} + +static int intersect_rates(const int *source_rates, int source_len, + const int *sink_rates, int sink_len, + int *common_rates) +{ + int i = 0, j = 0, k = 0; + + while (i < source_len && j < sink_len) { + if (source_rates[i] == sink_rates[j]) { + if (WARN_ON(k >= DP_MAX_SUPPORTED_RATES)) + return k; + common_rates[k] = source_rates[i]; + ++k; + ++i; + ++j; + } else if (source_rates[i] < sink_rates[j]) { + ++i; + } else { + ++j; + } + } + return k; +} + +static int intel_dp_common_rates(struct intel_dp *intel_dp, + int *common_rates) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + const int *source_rates, *sink_rates; + int source_len, sink_len; + + sink_len = intel_dp_sink_rates(intel_dp, &sink_rates); + source_len = intel_dp_source_rates(dev, &source_rates); + + return intersect_rates(source_rates, source_len, + sink_rates, sink_len, + common_rates); +} + +static void snprintf_int_array(char *str, size_t len, + const int *array, int nelem) +{ + int i; + + str[0] = '\0'; + + for (i = 0; i < nelem; i++) { + int r = snprintf(str, len, "%d,", array[i]); + if (r >= len) + return; + str += r; + len -= r; + } +} + +static void intel_dp_print_rates(struct intel_dp *intel_dp) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + const int *source_rates, *sink_rates; + int source_len, sink_len, common_len; + int common_rates[DP_MAX_SUPPORTED_RATES]; + char str[128]; /* FIXME: too big for stack? */ + + if ((drm_debug & DRM_UT_KMS) == 0) + return; + + source_len = intel_dp_source_rates(dev, &source_rates); + snprintf_int_array(str, sizeof(str), source_rates, source_len); + DRM_DEBUG_KMS("source rates: %s\n", str); + + sink_len = intel_dp_sink_rates(intel_dp, &sink_rates); + snprintf_int_array(str, sizeof(str), sink_rates, sink_len); + DRM_DEBUG_KMS("sink rates: %s\n", str); + + common_len = intel_dp_common_rates(intel_dp, common_rates); + snprintf_int_array(str, sizeof(str), common_rates, common_len); + DRM_DEBUG_KMS("common rates: %s\n", str); +} + +static int rate_to_index(int find, const int *rates) +{ + int i = 0; + + for (i = 0; i < DP_MAX_SUPPORTED_RATES; ++i) + if (find == rates[i]) + break; + + return i; +} + +int +intel_dp_max_link_rate(struct intel_dp *intel_dp) +{ + int rates[DP_MAX_SUPPORTED_RATES] = {}; + int len; + + len = intel_dp_common_rates(intel_dp, rates); + if (WARN_ON(len <= 0)) + return 162000; + + return rates[rate_to_index(0, rates) - 1]; +} + +int intel_dp_rate_select(struct intel_dp *intel_dp, int rate) +{ + return rate_to_index(rate, intel_dp->sink_rates); +} + +bool +intel_dp_compute_config(struct intel_encoder *encoder, + struct intel_crtc_state *pipe_config) +{ + struct drm_device *dev = encoder->base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode; + struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base); + enum port port = dp_to_dig_port(intel_dp)->port; + struct intel_crtc *intel_crtc = to_intel_crtc(pipe_config->base.crtc); + struct intel_connector *intel_connector = intel_dp->attached_connector; + int lane_count, clock; + int min_lane_count = 1; + int max_lane_count = intel_dp_max_lane_count(intel_dp); + /* Conveniently, the link BW constants become indices with a shift...*/ + int min_clock = 0; + int max_clock; + int bpp, mode_rate; + int link_avail, link_clock; + int common_rates[DP_MAX_SUPPORTED_RATES] = {}; + int common_len; + + common_len = intel_dp_common_rates(intel_dp, common_rates); + + /* No common link rates between source and sink */ + WARN_ON(common_len <= 0); + + max_clock = common_len - 1; + + if (HAS_PCH_SPLIT(dev) && !HAS_DDI(dev) && port != PORT_A) + pipe_config->has_pch_encoder = true; + + pipe_config->has_dp_encoder = true; + pipe_config->has_drrs = false; + pipe_config->has_audio = intel_dp->has_audio && port != PORT_A; + + if (is_edp(intel_dp) && intel_connector->panel.fixed_mode) { + intel_fixed_panel_mode(intel_connector->panel.fixed_mode, + adjusted_mode); + if (!HAS_PCH_SPLIT(dev)) + intel_gmch_panel_fitting(intel_crtc, pipe_config, + intel_connector->panel.fitting_mode); + else + intel_pch_panel_fitting(intel_crtc, pipe_config, + intel_connector->panel.fitting_mode); + } + + if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK) + return false; + + DRM_DEBUG_KMS("DP link computation with max lane count %i " + "max bw %d pixel clock %iKHz\n", + max_lane_count, common_rates[max_clock], + adjusted_mode->crtc_clock); + + /* Walk through all bpp values. Luckily they're all nicely spaced with 2 + * bpc in between. */ + bpp = pipe_config->pipe_bpp; + if (is_edp(intel_dp)) { + if (dev_priv->vbt.edp_bpp && dev_priv->vbt.edp_bpp < bpp) { + DRM_DEBUG_KMS("clamping bpp for eDP panel to BIOS-provided %i\n", + dev_priv->vbt.edp_bpp); + bpp = dev_priv->vbt.edp_bpp; + } + + /* + * Use the maximum clock and number of lanes the eDP panel + * advertizes being capable of. The panels are generally + * designed to support only a single clock and lane + * configuration, and typically these values correspond to the + * native resolution of the panel. + */ + min_lane_count = max_lane_count; + min_clock = max_clock; + } + + for (; bpp >= 6*3; bpp -= 2*3) { + mode_rate = intel_dp_link_required(adjusted_mode->crtc_clock, + bpp); + + for (clock = min_clock; clock <= max_clock; clock++) { + for (lane_count = min_lane_count; + lane_count <= max_lane_count; + lane_count <<= 1) { + + link_clock = common_rates[clock]; + link_avail = intel_dp_max_data_rate(link_clock, + lane_count); + + if (mode_rate <= link_avail) { + goto found; + } + } + } + } + + return false; + +found: + if (intel_dp->color_range_auto) { + /* + * See: + * CEA-861-E - 5.1 Default Encoding Parameters + * VESA DisplayPort Ver.1.2a - 5.1.1.1 Video Colorimetry + */ + if (bpp != 18 && drm_match_cea_mode(adjusted_mode) > 1) + intel_dp->color_range = DP_COLOR_RANGE_16_235; + else + intel_dp->color_range = 0; + } + + if (intel_dp->color_range) + pipe_config->limited_color_range = true; + + intel_dp->lane_count = lane_count; + + if (intel_dp->num_sink_rates) { + intel_dp->link_bw = 0; + intel_dp->rate_select = + intel_dp_rate_select(intel_dp, common_rates[clock]); + } else { + intel_dp->link_bw = + drm_dp_link_rate_to_bw_code(common_rates[clock]); + intel_dp->rate_select = 0; + } + + pipe_config->pipe_bpp = bpp; + pipe_config->port_clock = common_rates[clock]; + + DRM_DEBUG_KMS("DP link bw %02x lane count %d clock %d bpp %d\n", + intel_dp->link_bw, intel_dp->lane_count, + pipe_config->port_clock, bpp); + DRM_DEBUG_KMS("DP link bw required %i available %i\n", + mode_rate, link_avail); + + intel_link_compute_m_n(bpp, lane_count, + adjusted_mode->crtc_clock, + pipe_config->port_clock, + &pipe_config->dp_m_n); + + if (intel_connector->panel.downclock_mode != NULL && + dev_priv->drrs.type == SEAMLESS_DRRS_SUPPORT) { + pipe_config->has_drrs = true; + intel_link_compute_m_n(bpp, lane_count, + intel_connector->panel.downclock_mode->clock, + pipe_config->port_clock, + &pipe_config->dp_m2_n2); + } + + if (IS_SKYLAKE(dev) && is_edp(intel_dp)) + skl_edp_set_pll_config(pipe_config, common_rates[clock]); + else if (IS_HASWELL(dev) || IS_BROADWELL(dev)) + hsw_dp_set_ddi_pll_sel(pipe_config, intel_dp->link_bw); + else + intel_dp_set_clock(encoder, pipe_config, intel_dp->link_bw); + + return true; +} + +static void ironlake_set_pll_cpu_edp(struct intel_dp *intel_dp) +{ + struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp); + struct intel_crtc *crtc = to_intel_crtc(dig_port->base.base.crtc); + struct drm_device *dev = crtc->base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + u32 dpa_ctl; + + DRM_DEBUG_KMS("eDP PLL enable for clock %d\n", + crtc->config->port_clock); + dpa_ctl = I915_READ(DP_A); + dpa_ctl &= ~DP_PLL_FREQ_MASK; + + if (crtc->config->port_clock == 162000) { + /* For a long time we've carried around a ILK-DevA w/a for the + * 160MHz clock. If we're really unlucky, it's still required. + */ + DRM_DEBUG_KMS("160MHz cpu eDP clock, might need ilk devA w/a\n"); + dpa_ctl |= DP_PLL_FREQ_160MHZ; + intel_dp->DP |= DP_PLL_FREQ_160MHZ; + } else { + dpa_ctl |= DP_PLL_FREQ_270MHZ; + intel_dp->DP |= DP_PLL_FREQ_270MHZ; + } + + I915_WRITE(DP_A, dpa_ctl); + + POSTING_READ(DP_A); + udelay(500); +} + +static void intel_dp_prepare(struct intel_encoder *encoder) +{ + struct drm_device *dev = encoder->base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base); + enum port port = dp_to_dig_port(intel_dp)->port; + struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc); + struct drm_display_mode *adjusted_mode = &crtc->config->base.adjusted_mode; + + /* + * There are four kinds of DP registers: + * + * IBX PCH + * SNB CPU + * IVB CPU + * CPT PCH + * + * IBX PCH and CPU are the same for almost everything, + * except that the CPU DP PLL is configured in this + * register + * + * CPT PCH is quite different, having many bits moved + * to the TRANS_DP_CTL register instead. That + * configuration happens (oddly) in ironlake_pch_enable + */ + + /* Preserve the BIOS-computed detected bit. This is + * supposed to be read-only. + */ + intel_dp->DP = I915_READ(intel_dp->output_reg) & DP_DETECTED; + + /* Handle DP bits in common between all three register formats */ + intel_dp->DP |= DP_VOLTAGE_0_4 | DP_PRE_EMPHASIS_0; + intel_dp->DP |= DP_PORT_WIDTH(intel_dp->lane_count); + + if (crtc->config->has_audio) + intel_dp->DP |= DP_AUDIO_OUTPUT_ENABLE; + + /* Split out the IBX/CPU vs CPT settings */ + + if (port == PORT_A && IS_GEN7(dev) && !IS_VALLEYVIEW(dev)) { + if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC) + intel_dp->DP |= DP_SYNC_HS_HIGH; + if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC) + intel_dp->DP |= DP_SYNC_VS_HIGH; + intel_dp->DP |= DP_LINK_TRAIN_OFF_CPT; + + if (drm_dp_enhanced_frame_cap(intel_dp->dpcd)) + intel_dp->DP |= DP_ENHANCED_FRAMING; + + intel_dp->DP |= crtc->pipe << 29; + } else if (!HAS_PCH_CPT(dev) || port == PORT_A) { + if (!HAS_PCH_SPLIT(dev) && !IS_VALLEYVIEW(dev)) + intel_dp->DP |= intel_dp->color_range; + + if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC) + intel_dp->DP |= DP_SYNC_HS_HIGH; + if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC) + intel_dp->DP |= DP_SYNC_VS_HIGH; + intel_dp->DP |= DP_LINK_TRAIN_OFF; + + if (drm_dp_enhanced_frame_cap(intel_dp->dpcd)) + intel_dp->DP |= DP_ENHANCED_FRAMING; + + if (!IS_CHERRYVIEW(dev)) { + if (crtc->pipe == 1) + intel_dp->DP |= DP_PIPEB_SELECT; + } else { + intel_dp->DP |= DP_PIPE_SELECT_CHV(crtc->pipe); + } + } else { + intel_dp->DP |= DP_LINK_TRAIN_OFF_CPT; + } +} + +#define IDLE_ON_MASK (PP_ON | PP_SEQUENCE_MASK | 0 | PP_SEQUENCE_STATE_MASK) +#define IDLE_ON_VALUE (PP_ON | PP_SEQUENCE_NONE | 0 | PP_SEQUENCE_STATE_ON_IDLE) + +#define IDLE_OFF_MASK (PP_ON | PP_SEQUENCE_MASK | 0 | 0) +#define IDLE_OFF_VALUE (0 | PP_SEQUENCE_NONE | 0 | 0) + +#define IDLE_CYCLE_MASK (PP_ON | PP_SEQUENCE_MASK | PP_CYCLE_DELAY_ACTIVE | PP_SEQUENCE_STATE_MASK) +#define IDLE_CYCLE_VALUE (0 | PP_SEQUENCE_NONE | 0 | PP_SEQUENCE_STATE_OFF_IDLE) + +static void wait_panel_status(struct intel_dp *intel_dp, + u32 mask, + u32 value) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct drm_i915_private *dev_priv = dev->dev_private; + u32 pp_stat_reg, pp_ctrl_reg; + + lockdep_assert_held(&dev_priv->pps_mutex); + + pp_stat_reg = _pp_stat_reg(intel_dp); + pp_ctrl_reg = _pp_ctrl_reg(intel_dp); + + DRM_DEBUG_KMS("mask %08x value %08x status %08x control %08x\n", + mask, value, + I915_READ(pp_stat_reg), + I915_READ(pp_ctrl_reg)); + + if (_wait_for((I915_READ(pp_stat_reg) & mask) == value, 5000, 10)) { + DRM_ERROR("Panel status timeout: status %08x control %08x\n", + I915_READ(pp_stat_reg), + I915_READ(pp_ctrl_reg)); + } + + DRM_DEBUG_KMS("Wait complete\n"); +} + +static void wait_panel_on(struct intel_dp *intel_dp) +{ + DRM_DEBUG_KMS("Wait for panel power on\n"); + wait_panel_status(intel_dp, IDLE_ON_MASK, IDLE_ON_VALUE); +} + +static void wait_panel_off(struct intel_dp *intel_dp) +{ + DRM_DEBUG_KMS("Wait for panel power off time\n"); + wait_panel_status(intel_dp, IDLE_OFF_MASK, IDLE_OFF_VALUE); +} + +static void wait_panel_power_cycle(struct intel_dp *intel_dp) +{ + DRM_DEBUG_KMS("Wait for panel power cycle\n"); + + /* When we disable the VDD override bit last we have to do the manual + * wait. */ + wait_remaining_ms_from_jiffies(intel_dp->last_power_cycle, + intel_dp->panel_power_cycle_delay); + + wait_panel_status(intel_dp, IDLE_CYCLE_MASK, IDLE_CYCLE_VALUE); +} + +static void wait_backlight_on(struct intel_dp *intel_dp) +{ + wait_remaining_ms_from_jiffies(intel_dp->last_power_on, + intel_dp->backlight_on_delay); +} + +static void edp_wait_backlight_off(struct intel_dp *intel_dp) +{ + wait_remaining_ms_from_jiffies(intel_dp->last_backlight_off, + intel_dp->backlight_off_delay); +} + +/* Read the current pp_control value, unlocking the register if it + * is locked + */ + +static u32 ironlake_get_pp_control(struct intel_dp *intel_dp) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct drm_i915_private *dev_priv = dev->dev_private; + u32 control; + + lockdep_assert_held(&dev_priv->pps_mutex); + + control = I915_READ(_pp_ctrl_reg(intel_dp)); + control &= ~PANEL_UNLOCK_MASK; + control |= PANEL_UNLOCK_REGS; + return control; +} + +/* + * Must be paired with edp_panel_vdd_off(). + * Must hold pps_mutex around the whole on/off sequence. + * Can be nested with intel_edp_panel_vdd_{on,off}() calls. + */ +static bool edp_panel_vdd_on(struct intel_dp *intel_dp) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct intel_encoder *intel_encoder = &intel_dig_port->base; + struct drm_i915_private *dev_priv = dev->dev_private; + enum intel_display_power_domain power_domain; + u32 pp; + u32 pp_stat_reg, pp_ctrl_reg; + bool need_to_disable = !intel_dp->want_panel_vdd; + + lockdep_assert_held(&dev_priv->pps_mutex); + + if (!is_edp(intel_dp)) + return false; + + cancel_delayed_work(&intel_dp->panel_vdd_work); + intel_dp->want_panel_vdd = true; + + if (edp_have_panel_vdd(intel_dp)) + return need_to_disable; + + power_domain = intel_display_port_power_domain(intel_encoder); + intel_display_power_get(dev_priv, power_domain); + + DRM_DEBUG_KMS("Turning eDP port %c VDD on\n", + port_name(intel_dig_port->port)); + + if (!edp_have_panel_power(intel_dp)) + wait_panel_power_cycle(intel_dp); + + pp = ironlake_get_pp_control(intel_dp); + pp |= EDP_FORCE_VDD; + + pp_stat_reg = _pp_stat_reg(intel_dp); + pp_ctrl_reg = _pp_ctrl_reg(intel_dp); + + I915_WRITE(pp_ctrl_reg, pp); + POSTING_READ(pp_ctrl_reg); + DRM_DEBUG_KMS("PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n", + I915_READ(pp_stat_reg), I915_READ(pp_ctrl_reg)); + /* + * If the panel wasn't on, delay before accessing aux channel + */ + if (!edp_have_panel_power(intel_dp)) { + DRM_DEBUG_KMS("eDP port %c panel power wasn't enabled\n", + port_name(intel_dig_port->port)); + msleep(intel_dp->panel_power_up_delay); + } + + return need_to_disable; +} + +/* + * Must be paired with intel_edp_panel_vdd_off() or + * intel_edp_panel_off(). + * Nested calls to these functions are not allowed since + * we drop the lock. Caller must use some higher level + * locking to prevent nested calls from other threads. + */ +void intel_edp_panel_vdd_on(struct intel_dp *intel_dp) +{ + bool vdd; + + if (!is_edp(intel_dp)) + return; + + pps_lock(intel_dp); + vdd = edp_panel_vdd_on(intel_dp); + pps_unlock(intel_dp); + + I915_STATE_WARN(!vdd, "eDP port %c VDD already requested on\n", + port_name(dp_to_dig_port(intel_dp)->port)); +} + +static void edp_panel_vdd_off_sync(struct intel_dp *intel_dp) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_digital_port *intel_dig_port = + dp_to_dig_port(intel_dp); + struct intel_encoder *intel_encoder = &intel_dig_port->base; + enum intel_display_power_domain power_domain; + u32 pp; + u32 pp_stat_reg, pp_ctrl_reg; + + lockdep_assert_held(&dev_priv->pps_mutex); + + WARN_ON(intel_dp->want_panel_vdd); + + if (!edp_have_panel_vdd(intel_dp)) + return; + + DRM_DEBUG_KMS("Turning eDP port %c VDD off\n", + port_name(intel_dig_port->port)); + + pp = ironlake_get_pp_control(intel_dp); + pp &= ~EDP_FORCE_VDD; + + pp_ctrl_reg = _pp_ctrl_reg(intel_dp); + pp_stat_reg = _pp_stat_reg(intel_dp); + + I915_WRITE(pp_ctrl_reg, pp); + POSTING_READ(pp_ctrl_reg); + + /* Make sure sequencer is idle before allowing subsequent activity */ + DRM_DEBUG_KMS("PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n", + I915_READ(pp_stat_reg), I915_READ(pp_ctrl_reg)); + + if ((pp & POWER_TARGET_ON) == 0) + intel_dp->last_power_cycle = jiffies; + + power_domain = intel_display_port_power_domain(intel_encoder); + intel_display_power_put(dev_priv, power_domain); +} + +static void edp_panel_vdd_work(struct work_struct *__work) +{ + struct intel_dp *intel_dp = container_of(to_delayed_work(__work), + struct intel_dp, panel_vdd_work); + + pps_lock(intel_dp); + if (!intel_dp->want_panel_vdd) + edp_panel_vdd_off_sync(intel_dp); + pps_unlock(intel_dp); +} + +static void edp_panel_vdd_schedule_off(struct intel_dp *intel_dp) +{ + unsigned long delay; + + /* + * Queue the timer to fire a long time from now (relative to the power + * down delay) to keep the panel power up across a sequence of + * operations. + */ + delay = msecs_to_jiffies(intel_dp->panel_power_cycle_delay * 5); + schedule_delayed_work(&intel_dp->panel_vdd_work, delay); +} + +/* + * Must be paired with edp_panel_vdd_on(). + * Must hold pps_mutex around the whole on/off sequence. + * Can be nested with intel_edp_panel_vdd_{on,off}() calls. + */ +static void edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync) +{ + struct drm_i915_private *dev_priv = + intel_dp_to_dev(intel_dp)->dev_private; + + lockdep_assert_held(&dev_priv->pps_mutex); + + if (!is_edp(intel_dp)) + return; + + I915_STATE_WARN(!intel_dp->want_panel_vdd, "eDP port %c VDD not forced on", + port_name(dp_to_dig_port(intel_dp)->port)); + + intel_dp->want_panel_vdd = false; + + if (sync) + edp_panel_vdd_off_sync(intel_dp); + else + edp_panel_vdd_schedule_off(intel_dp); +} + +static void edp_panel_on(struct intel_dp *intel_dp) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct drm_i915_private *dev_priv = dev->dev_private; + u32 pp; + u32 pp_ctrl_reg; + + lockdep_assert_held(&dev_priv->pps_mutex); + + if (!is_edp(intel_dp)) + return; + + DRM_DEBUG_KMS("Turn eDP port %c panel power on\n", + port_name(dp_to_dig_port(intel_dp)->port)); + + if (WARN(edp_have_panel_power(intel_dp), + "eDP port %c panel power already on\n", + port_name(dp_to_dig_port(intel_dp)->port))) + return; + + wait_panel_power_cycle(intel_dp); + + pp_ctrl_reg = _pp_ctrl_reg(intel_dp); + pp = ironlake_get_pp_control(intel_dp); + if (IS_GEN5(dev)) { + /* ILK workaround: disable reset around power sequence */ + pp &= ~PANEL_POWER_RESET; + I915_WRITE(pp_ctrl_reg, pp); + POSTING_READ(pp_ctrl_reg); + } + + pp |= POWER_TARGET_ON; + if (!IS_GEN5(dev)) + pp |= PANEL_POWER_RESET; + + I915_WRITE(pp_ctrl_reg, pp); + POSTING_READ(pp_ctrl_reg); + + wait_panel_on(intel_dp); + intel_dp->last_power_on = jiffies; + + if (IS_GEN5(dev)) { + pp |= PANEL_POWER_RESET; /* restore panel reset bit */ + I915_WRITE(pp_ctrl_reg, pp); + POSTING_READ(pp_ctrl_reg); + } +} + +void intel_edp_panel_on(struct intel_dp *intel_dp) +{ + if (!is_edp(intel_dp)) + return; + + pps_lock(intel_dp); + edp_panel_on(intel_dp); + pps_unlock(intel_dp); +} + + +static void edp_panel_off(struct intel_dp *intel_dp) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct intel_encoder *intel_encoder = &intel_dig_port->base; + struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct drm_i915_private *dev_priv = dev->dev_private; + enum intel_display_power_domain power_domain; + u32 pp; + u32 pp_ctrl_reg; + + lockdep_assert_held(&dev_priv->pps_mutex); + + if (!is_edp(intel_dp)) + return; + + DRM_DEBUG_KMS("Turn eDP port %c panel power off\n", + port_name(dp_to_dig_port(intel_dp)->port)); + + WARN(!intel_dp->want_panel_vdd, "Need eDP port %c VDD to turn off panel\n", + port_name(dp_to_dig_port(intel_dp)->port)); + + pp = ironlake_get_pp_control(intel_dp); + /* We need to switch off panel power _and_ force vdd, for otherwise some + * panels get very unhappy and cease to work. */ + pp &= ~(POWER_TARGET_ON | PANEL_POWER_RESET | EDP_FORCE_VDD | + EDP_BLC_ENABLE); + + pp_ctrl_reg = _pp_ctrl_reg(intel_dp); + + intel_dp->want_panel_vdd = false; + + I915_WRITE(pp_ctrl_reg, pp); + POSTING_READ(pp_ctrl_reg); + + intel_dp->last_power_cycle = jiffies; + wait_panel_off(intel_dp); + + /* We got a reference when we enabled the VDD. */ + power_domain = intel_display_port_power_domain(intel_encoder); + intel_display_power_put(dev_priv, power_domain); +} + +void intel_edp_panel_off(struct intel_dp *intel_dp) +{ + if (!is_edp(intel_dp)) + return; + + pps_lock(intel_dp); + edp_panel_off(intel_dp); + pps_unlock(intel_dp); +} + +/* Enable backlight in the panel power control. */ +static void _intel_edp_backlight_on(struct intel_dp *intel_dp) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct drm_device *dev = intel_dig_port->base.base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + u32 pp; + u32 pp_ctrl_reg; + + /* + * If we enable the backlight right away following a panel power + * on, we may see slight flicker as the panel syncs with the eDP + * link. So delay a bit to make sure the image is solid before + * allowing it to appear. + */ + wait_backlight_on(intel_dp); + + pps_lock(intel_dp); + + pp = ironlake_get_pp_control(intel_dp); + pp |= EDP_BLC_ENABLE; + + pp_ctrl_reg = _pp_ctrl_reg(intel_dp); + + I915_WRITE(pp_ctrl_reg, pp); + POSTING_READ(pp_ctrl_reg); + + pps_unlock(intel_dp); +} + +/* Enable backlight PWM and backlight PP control. */ +void intel_edp_backlight_on(struct intel_dp *intel_dp) +{ + if (!is_edp(intel_dp)) + return; + + DRM_DEBUG_KMS("\n"); + + intel_panel_enable_backlight(intel_dp->attached_connector); + _intel_edp_backlight_on(intel_dp); +} + +/* Disable backlight in the panel power control. */ +static void _intel_edp_backlight_off(struct intel_dp *intel_dp) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct drm_i915_private *dev_priv = dev->dev_private; + u32 pp; + u32 pp_ctrl_reg; + + if (!is_edp(intel_dp)) + return; + + pps_lock(intel_dp); + + pp = ironlake_get_pp_control(intel_dp); + pp &= ~EDP_BLC_ENABLE; + + pp_ctrl_reg = _pp_ctrl_reg(intel_dp); + + I915_WRITE(pp_ctrl_reg, pp); + POSTING_READ(pp_ctrl_reg); + + pps_unlock(intel_dp); + + intel_dp->last_backlight_off = jiffies; + edp_wait_backlight_off(intel_dp); +} + +/* Disable backlight PP control and backlight PWM. */ +void intel_edp_backlight_off(struct intel_dp *intel_dp) +{ + if (!is_edp(intel_dp)) + return; + + DRM_DEBUG_KMS("\n"); + + _intel_edp_backlight_off(intel_dp); + intel_panel_disable_backlight(intel_dp->attached_connector); +} + +/* + * Hook for controlling the panel power control backlight through the bl_power + * sysfs attribute. Take care to handle multiple calls. + */ +static void intel_edp_backlight_power(struct intel_connector *connector, + bool enable) +{ + struct intel_dp *intel_dp = intel_attached_dp(&connector->base); + bool is_enabled; + + pps_lock(intel_dp); + is_enabled = ironlake_get_pp_control(intel_dp) & EDP_BLC_ENABLE; + pps_unlock(intel_dp); + + if (is_enabled == enable) + return; + + DRM_DEBUG_KMS("panel power control backlight %s\n", + enable ? "enable" : "disable"); + + if (enable) + _intel_edp_backlight_on(intel_dp); + else + _intel_edp_backlight_off(intel_dp); +} + +static void ironlake_edp_pll_on(struct intel_dp *intel_dp) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct drm_crtc *crtc = intel_dig_port->base.base.crtc; + struct drm_device *dev = crtc->dev; + struct drm_i915_private *dev_priv = dev->dev_private; + u32 dpa_ctl; + + assert_pipe_disabled(dev_priv, + to_intel_crtc(crtc)->pipe); + + DRM_DEBUG_KMS("\n"); + dpa_ctl = I915_READ(DP_A); + WARN(dpa_ctl & DP_PLL_ENABLE, "dp pll on, should be off\n"); + WARN(dpa_ctl & DP_PORT_EN, "dp port still on, should be off\n"); + + /* We don't adjust intel_dp->DP while tearing down the link, to + * facilitate link retraining (e.g. after hotplug). Hence clear all + * enable bits here to ensure that we don't enable too much. */ + intel_dp->DP &= ~(DP_PORT_EN | DP_AUDIO_OUTPUT_ENABLE); + intel_dp->DP |= DP_PLL_ENABLE; + I915_WRITE(DP_A, intel_dp->DP); + POSTING_READ(DP_A); + udelay(200); +} + +static void ironlake_edp_pll_off(struct intel_dp *intel_dp) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct drm_crtc *crtc = intel_dig_port->base.base.crtc; + struct drm_device *dev = crtc->dev; + struct drm_i915_private *dev_priv = dev->dev_private; + u32 dpa_ctl; + + assert_pipe_disabled(dev_priv, + to_intel_crtc(crtc)->pipe); + + dpa_ctl = I915_READ(DP_A); + WARN((dpa_ctl & DP_PLL_ENABLE) == 0, + "dp pll off, should be on\n"); + WARN(dpa_ctl & DP_PORT_EN, "dp port still on, should be off\n"); + + /* We can't rely on the value tracked for the DP register in + * intel_dp->DP because link_down must not change that (otherwise link + * re-training will fail. */ + dpa_ctl &= ~DP_PLL_ENABLE; + I915_WRITE(DP_A, dpa_ctl); + POSTING_READ(DP_A); + udelay(200); +} + +/* If the sink supports it, try to set the power state appropriately */ +void intel_dp_sink_dpms(struct intel_dp *intel_dp, int mode) +{ + int ret, i; + + /* Should have a valid DPCD by this point */ + if (intel_dp->dpcd[DP_DPCD_REV] < 0x11) + return; + + if (mode != DRM_MODE_DPMS_ON) { + ret = drm_dp_dpcd_writeb(&intel_dp->aux, DP_SET_POWER, + DP_SET_POWER_D3); + } else { + /* + * When turning on, we need to retry for 1ms to give the sink + * time to wake up. + */ + for (i = 0; i < 3; i++) { + ret = drm_dp_dpcd_writeb(&intel_dp->aux, DP_SET_POWER, + DP_SET_POWER_D0); + if (ret == 1) + break; + msleep(1); + } + } + + if (ret != 1) + DRM_DEBUG_KMS("failed to %s sink power state\n", + mode == DRM_MODE_DPMS_ON ? "enable" : "disable"); +} + +static bool intel_dp_get_hw_state(struct intel_encoder *encoder, + enum pipe *pipe) +{ + struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base); + enum port port = dp_to_dig_port(intel_dp)->port; + struct drm_device *dev = encoder->base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + enum intel_display_power_domain power_domain; + u32 tmp; + + power_domain = intel_display_port_power_domain(encoder); + if (!intel_display_power_is_enabled(dev_priv, power_domain)) + return false; + + tmp = I915_READ(intel_dp->output_reg); + + if (!(tmp & DP_PORT_EN)) + return false; + + if (port == PORT_A && IS_GEN7(dev) && !IS_VALLEYVIEW(dev)) { + *pipe = PORT_TO_PIPE_CPT(tmp); + } else if (IS_CHERRYVIEW(dev)) { + *pipe = DP_PORT_TO_PIPE_CHV(tmp); + } else if (!HAS_PCH_CPT(dev) || port == PORT_A) { + *pipe = PORT_TO_PIPE(tmp); + } else { + u32 trans_sel; + u32 trans_dp; + int i; + + switch (intel_dp->output_reg) { + case PCH_DP_B: + trans_sel = TRANS_DP_PORT_SEL_B; + break; + case PCH_DP_C: + trans_sel = TRANS_DP_PORT_SEL_C; + break; + case PCH_DP_D: + trans_sel = TRANS_DP_PORT_SEL_D; + break; + default: + return true; + } + + for_each_pipe(dev_priv, i) { + trans_dp = I915_READ(TRANS_DP_CTL(i)); + if ((trans_dp & TRANS_DP_PORT_SEL_MASK) == trans_sel) { + *pipe = i; + return true; + } + } + + DRM_DEBUG_KMS("No pipe for dp port 0x%x found\n", + intel_dp->output_reg); + } + + return true; +} + +static void intel_dp_get_config(struct intel_encoder *encoder, + struct intel_crtc_state *pipe_config) +{ + struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base); + u32 tmp, flags = 0; + struct drm_device *dev = encoder->base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + enum port port = dp_to_dig_port(intel_dp)->port; + struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc); + int dotclock; + + tmp = I915_READ(intel_dp->output_reg); + + pipe_config->has_audio = tmp & DP_AUDIO_OUTPUT_ENABLE && port != PORT_A; + + if ((port == PORT_A) || !HAS_PCH_CPT(dev)) { + if (tmp & DP_SYNC_HS_HIGH) + flags |= DRM_MODE_FLAG_PHSYNC; + else + flags |= DRM_MODE_FLAG_NHSYNC; + + if (tmp & DP_SYNC_VS_HIGH) + flags |= DRM_MODE_FLAG_PVSYNC; + else + flags |= DRM_MODE_FLAG_NVSYNC; + } else { + tmp = I915_READ(TRANS_DP_CTL(crtc->pipe)); + if (tmp & TRANS_DP_HSYNC_ACTIVE_HIGH) + flags |= DRM_MODE_FLAG_PHSYNC; + else + flags |= DRM_MODE_FLAG_NHSYNC; + + if (tmp & TRANS_DP_VSYNC_ACTIVE_HIGH) + flags |= DRM_MODE_FLAG_PVSYNC; + else + flags |= DRM_MODE_FLAG_NVSYNC; + } + + pipe_config->base.adjusted_mode.flags |= flags; + + if (!HAS_PCH_SPLIT(dev) && !IS_VALLEYVIEW(dev) && + tmp & DP_COLOR_RANGE_16_235) + pipe_config->limited_color_range = true; + + pipe_config->has_dp_encoder = true; + + intel_dp_get_m_n(crtc, pipe_config); + + if (port == PORT_A) { + if ((I915_READ(DP_A) & DP_PLL_FREQ_MASK) == DP_PLL_FREQ_160MHZ) + pipe_config->port_clock = 162000; + else + pipe_config->port_clock = 270000; + } + + dotclock = intel_dotclock_calculate(pipe_config->port_clock, + &pipe_config->dp_m_n); + + if (HAS_PCH_SPLIT(dev_priv->dev) && port != PORT_A) + ironlake_check_encoder_dotclock(pipe_config, dotclock); + + pipe_config->base.adjusted_mode.crtc_clock = dotclock; + + if (is_edp(intel_dp) && dev_priv->vbt.edp_bpp && + pipe_config->pipe_bpp > dev_priv->vbt.edp_bpp) { + /* + * This is a big fat ugly hack. + * + * Some machines in UEFI boot mode provide us a VBT that has 18 + * bpp and 1.62 GHz link bandwidth for eDP, which for reasons + * unknown we fail to light up. Yet the same BIOS boots up with + * 24 bpp and 2.7 GHz link. Use the same bpp as the BIOS uses as + * max, not what it tells us to use. + * + * Note: This will still be broken if the eDP panel is not lit + * up by the BIOS, and thus we can't get the mode at module + * load. + */ + DRM_DEBUG_KMS("pipe has %d bpp for eDP panel, overriding BIOS-provided max %d bpp\n", + pipe_config->pipe_bpp, dev_priv->vbt.edp_bpp); + dev_priv->vbt.edp_bpp = pipe_config->pipe_bpp; + } +} + +static void intel_disable_dp(struct intel_encoder *encoder) +{ + struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base); + struct drm_device *dev = encoder->base.dev; + struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc); + + if (crtc->config->has_audio) + intel_audio_codec_disable(encoder); + + if (HAS_PSR(dev) && !HAS_DDI(dev)) + intel_psr_disable(intel_dp); + + /* Make sure the panel is off before trying to change the mode. But also + * ensure that we have vdd while we switch off the panel. */ + intel_edp_panel_vdd_on(intel_dp); + intel_edp_backlight_off(intel_dp); + intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF); + intel_edp_panel_off(intel_dp); + + /* disable the port before the pipe on g4x */ + if (INTEL_INFO(dev)->gen < 5) + intel_dp_link_down(intel_dp); +} + +static void ilk_post_disable_dp(struct intel_encoder *encoder) +{ + struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base); + enum port port = dp_to_dig_port(intel_dp)->port; + + intel_dp_link_down(intel_dp); + if (port == PORT_A) + ironlake_edp_pll_off(intel_dp); +} + +static void vlv_post_disable_dp(struct intel_encoder *encoder) +{ + struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base); + + intel_dp_link_down(intel_dp); +} + +static void chv_post_disable_dp(struct intel_encoder *encoder) +{ + struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base); + struct intel_digital_port *dport = dp_to_dig_port(intel_dp); + struct drm_device *dev = encoder->base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_crtc *intel_crtc = + to_intel_crtc(encoder->base.crtc); + enum dpio_channel ch = vlv_dport_to_channel(dport); + enum pipe pipe = intel_crtc->pipe; + u32 val; + + intel_dp_link_down(intel_dp); + + mutex_lock(&dev_priv->dpio_lock); + + /* Propagate soft reset to data lane reset */ + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW1(ch)); + val |= CHV_PCS_REQ_SOFTRESET_EN; + vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW1(ch), val); + + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW1(ch)); + val |= CHV_PCS_REQ_SOFTRESET_EN; + vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW1(ch), val); + + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW0(ch)); + val &= ~(DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET); + vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW0(ch), val); + + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW0(ch)); + val &= ~(DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET); + vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW0(ch), val); + + mutex_unlock(&dev_priv->dpio_lock); +} + +static void +_intel_dp_set_link_train(struct intel_dp *intel_dp, + uint32_t *DP, + uint8_t dp_train_pat) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct drm_device *dev = intel_dig_port->base.base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + enum port port = intel_dig_port->port; + + if (HAS_DDI(dev)) { + uint32_t temp = I915_READ(DP_TP_CTL(port)); + + if (dp_train_pat & DP_LINK_SCRAMBLING_DISABLE) + temp |= DP_TP_CTL_SCRAMBLE_DISABLE; + else + temp &= ~DP_TP_CTL_SCRAMBLE_DISABLE; + + temp &= ~DP_TP_CTL_LINK_TRAIN_MASK; + switch (dp_train_pat & DP_TRAINING_PATTERN_MASK) { + case DP_TRAINING_PATTERN_DISABLE: + temp |= DP_TP_CTL_LINK_TRAIN_NORMAL; + + break; + case DP_TRAINING_PATTERN_1: + temp |= DP_TP_CTL_LINK_TRAIN_PAT1; + break; + case DP_TRAINING_PATTERN_2: + temp |= DP_TP_CTL_LINK_TRAIN_PAT2; + break; + case DP_TRAINING_PATTERN_3: + temp |= DP_TP_CTL_LINK_TRAIN_PAT3; + break; + } + I915_WRITE(DP_TP_CTL(port), temp); + + } else if (HAS_PCH_CPT(dev) && (IS_GEN7(dev) || port != PORT_A)) { + *DP &= ~DP_LINK_TRAIN_MASK_CPT; + + switch (dp_train_pat & DP_TRAINING_PATTERN_MASK) { + case DP_TRAINING_PATTERN_DISABLE: + *DP |= DP_LINK_TRAIN_OFF_CPT; + break; + case DP_TRAINING_PATTERN_1: + *DP |= DP_LINK_TRAIN_PAT_1_CPT; + break; + case DP_TRAINING_PATTERN_2: + *DP |= DP_LINK_TRAIN_PAT_2_CPT; + break; + case DP_TRAINING_PATTERN_3: + DRM_ERROR("DP training pattern 3 not supported\n"); + *DP |= DP_LINK_TRAIN_PAT_2_CPT; + break; + } + + } else { + if (IS_CHERRYVIEW(dev)) + *DP &= ~DP_LINK_TRAIN_MASK_CHV; + else + *DP &= ~DP_LINK_TRAIN_MASK; + + switch (dp_train_pat & DP_TRAINING_PATTERN_MASK) { + case DP_TRAINING_PATTERN_DISABLE: + *DP |= DP_LINK_TRAIN_OFF; + break; + case DP_TRAINING_PATTERN_1: + *DP |= DP_LINK_TRAIN_PAT_1; + break; + case DP_TRAINING_PATTERN_2: + *DP |= DP_LINK_TRAIN_PAT_2; + break; + case DP_TRAINING_PATTERN_3: + if (IS_CHERRYVIEW(dev)) { + *DP |= DP_LINK_TRAIN_PAT_3_CHV; + } else { + DRM_ERROR("DP training pattern 3 not supported\n"); + *DP |= DP_LINK_TRAIN_PAT_2; + } + break; + } + } +} + +static void intel_dp_enable_port(struct intel_dp *intel_dp) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct drm_i915_private *dev_priv = dev->dev_private; + + /* enable with pattern 1 (as per spec) */ + _intel_dp_set_link_train(intel_dp, &intel_dp->DP, + DP_TRAINING_PATTERN_1); + + I915_WRITE(intel_dp->output_reg, intel_dp->DP); + POSTING_READ(intel_dp->output_reg); + + /* + * Magic for VLV/CHV. We _must_ first set up the register + * without actually enabling the port, and then do another + * write to enable the port. Otherwise link training will + * fail when the power sequencer is freshly used for this port. + */ + intel_dp->DP |= DP_PORT_EN; + + I915_WRITE(intel_dp->output_reg, intel_dp->DP); + POSTING_READ(intel_dp->output_reg); +} + +static void intel_enable_dp(struct intel_encoder *encoder) +{ + struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base); + struct drm_device *dev = encoder->base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc); + uint32_t dp_reg = I915_READ(intel_dp->output_reg); + + if (WARN_ON(dp_reg & DP_PORT_EN)) + return; + + pps_lock(intel_dp); + + if (IS_VALLEYVIEW(dev)) + vlv_init_panel_power_sequencer(intel_dp); + + intel_dp_enable_port(intel_dp); + + edp_panel_vdd_on(intel_dp); + edp_panel_on(intel_dp); + edp_panel_vdd_off(intel_dp, true); + + pps_unlock(intel_dp); + + if (IS_VALLEYVIEW(dev)) + vlv_wait_port_ready(dev_priv, dp_to_dig_port(intel_dp)); + + intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON); + intel_dp_start_link_train(intel_dp); + intel_dp_complete_link_train(intel_dp); + intel_dp_stop_link_train(intel_dp); + + if (crtc->config->has_audio) { + DRM_DEBUG_DRIVER("Enabling DP audio on pipe %c\n", + pipe_name(crtc->pipe)); + intel_audio_codec_enable(encoder); + } +} + +static void g4x_enable_dp(struct intel_encoder *encoder) +{ + struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base); + + intel_enable_dp(encoder); + intel_edp_backlight_on(intel_dp); +} + +static void vlv_enable_dp(struct intel_encoder *encoder) +{ + struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base); + + intel_edp_backlight_on(intel_dp); + intel_psr_enable(intel_dp); +} + +static void g4x_pre_enable_dp(struct intel_encoder *encoder) +{ + struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base); + struct intel_digital_port *dport = dp_to_dig_port(intel_dp); + + intel_dp_prepare(encoder); + + /* Only ilk+ has port A */ + if (dport->port == PORT_A) { + ironlake_set_pll_cpu_edp(intel_dp); + ironlake_edp_pll_on(intel_dp); + } +} + +static void vlv_detach_power_sequencer(struct intel_dp *intel_dp) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct drm_i915_private *dev_priv = intel_dig_port->base.base.dev->dev_private; + enum pipe pipe = intel_dp->pps_pipe; + int pp_on_reg = VLV_PIPE_PP_ON_DELAYS(pipe); + + edp_panel_vdd_off_sync(intel_dp); + + /* + * VLV seems to get confused when multiple power seqeuencers + * have the same port selected (even if only one has power/vdd + * enabled). The failure manifests as vlv_wait_port_ready() failing + * CHV on the other hand doesn't seem to mind having the same port + * selected in multiple power seqeuencers, but let's clear the + * port select always when logically disconnecting a power sequencer + * from a port. + */ + DRM_DEBUG_KMS("detaching pipe %c power sequencer from port %c\n", + pipe_name(pipe), port_name(intel_dig_port->port)); + I915_WRITE(pp_on_reg, 0); + POSTING_READ(pp_on_reg); + + intel_dp->pps_pipe = INVALID_PIPE; +} + +static void vlv_steal_power_sequencer(struct drm_device *dev, + enum pipe pipe) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_encoder *encoder; + + lockdep_assert_held(&dev_priv->pps_mutex); + + if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B)) + return; + + list_for_each_entry(encoder, &dev->mode_config.encoder_list, + base.head) { + struct intel_dp *intel_dp; + enum port port; + + if (encoder->type != INTEL_OUTPUT_EDP) + continue; + + intel_dp = enc_to_intel_dp(&encoder->base); + port = dp_to_dig_port(intel_dp)->port; + + if (intel_dp->pps_pipe != pipe) + continue; + + DRM_DEBUG_KMS("stealing pipe %c power sequencer from port %c\n", + pipe_name(pipe), port_name(port)); + + WARN(encoder->connectors_active, + "stealing pipe %c power sequencer from active eDP port %c\n", + pipe_name(pipe), port_name(port)); + + /* make sure vdd is off before we steal it */ + vlv_detach_power_sequencer(intel_dp); + } +} + +static void vlv_init_panel_power_sequencer(struct intel_dp *intel_dp) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct intel_encoder *encoder = &intel_dig_port->base; + struct drm_device *dev = encoder->base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc); + + lockdep_assert_held(&dev_priv->pps_mutex); + + if (!is_edp(intel_dp)) + return; + + if (intel_dp->pps_pipe == crtc->pipe) + return; + + /* + * If another power sequencer was being used on this + * port previously make sure to turn off vdd there while + * we still have control of it. + */ + if (intel_dp->pps_pipe != INVALID_PIPE) + vlv_detach_power_sequencer(intel_dp); + + /* + * We may be stealing the power + * sequencer from another port. + */ + vlv_steal_power_sequencer(dev, crtc->pipe); + + /* now it's all ours */ + intel_dp->pps_pipe = crtc->pipe; + + DRM_DEBUG_KMS("initializing pipe %c power sequencer for port %c\n", + pipe_name(intel_dp->pps_pipe), port_name(intel_dig_port->port)); + + /* init power sequencer on this pipe and port */ + intel_dp_init_panel_power_sequencer(dev, intel_dp); + intel_dp_init_panel_power_sequencer_registers(dev, intel_dp); +} + +static void vlv_pre_enable_dp(struct intel_encoder *encoder) +{ + struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base); + struct intel_digital_port *dport = dp_to_dig_port(intel_dp); + struct drm_device *dev = encoder->base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc); + enum dpio_channel port = vlv_dport_to_channel(dport); + int pipe = intel_crtc->pipe; + u32 val; + + mutex_lock(&dev_priv->dpio_lock); + + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW8(port)); + val = 0; + if (pipe) + val |= (1<<21); + else + val &= ~(1<<21); + val |= 0x001000c4; + vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW8(port), val); + vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW14(port), 0x00760018); + vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW23(port), 0x00400888); + + mutex_unlock(&dev_priv->dpio_lock); + + intel_enable_dp(encoder); +} + +static void vlv_dp_pre_pll_enable(struct intel_encoder *encoder) +{ + struct intel_digital_port *dport = enc_to_dig_port(&encoder->base); + struct drm_device *dev = encoder->base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_crtc *intel_crtc = + to_intel_crtc(encoder->base.crtc); + enum dpio_channel port = vlv_dport_to_channel(dport); + int pipe = intel_crtc->pipe; + + intel_dp_prepare(encoder); + + /* Program Tx lane resets to default */ + mutex_lock(&dev_priv->dpio_lock); + vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW0(port), + DPIO_PCS_TX_LANE2_RESET | + DPIO_PCS_TX_LANE1_RESET); + vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW1(port), + DPIO_PCS_CLK_CRI_RXEB_EIOS_EN | + DPIO_PCS_CLK_CRI_RXDIGFILTSG_EN | + (1<dpio_lock); +} + +static void chv_pre_enable_dp(struct intel_encoder *encoder) +{ + struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base); + struct intel_digital_port *dport = dp_to_dig_port(intel_dp); + struct drm_device *dev = encoder->base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_crtc *intel_crtc = + to_intel_crtc(encoder->base.crtc); + enum dpio_channel ch = vlv_dport_to_channel(dport); + int pipe = intel_crtc->pipe; + int data, i; + u32 val; + + mutex_lock(&dev_priv->dpio_lock); + + /* allow hardware to manage TX FIFO reset source */ + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW11(ch)); + val &= ~DPIO_LANEDESKEW_STRAP_OVRD; + vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW11(ch), val); + + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW11(ch)); + val &= ~DPIO_LANEDESKEW_STRAP_OVRD; + vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW11(ch), val); + + /* Deassert soft data lane reset*/ + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW1(ch)); + val |= CHV_PCS_REQ_SOFTRESET_EN; + vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW1(ch), val); + + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW1(ch)); + val |= CHV_PCS_REQ_SOFTRESET_EN; + vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW1(ch), val); + + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW0(ch)); + val |= (DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET); + vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW0(ch), val); + + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW0(ch)); + val |= (DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET); + vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW0(ch), val); + + /* Program Tx lane latency optimal setting*/ + for (i = 0; i < 4; i++) { + /* Set the upar bit */ + data = (i == 1) ? 0x0 : 0x1; + vlv_dpio_write(dev_priv, pipe, CHV_TX_DW14(ch, i), + data << DPIO_UPAR_SHIFT); + } + + /* Data lane stagger programming */ + /* FIXME: Fix up value only after power analysis */ + + mutex_unlock(&dev_priv->dpio_lock); + + intel_enable_dp(encoder); +} + +static void chv_dp_pre_pll_enable(struct intel_encoder *encoder) +{ + struct intel_digital_port *dport = enc_to_dig_port(&encoder->base); + struct drm_device *dev = encoder->base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_crtc *intel_crtc = + to_intel_crtc(encoder->base.crtc); + enum dpio_channel ch = vlv_dport_to_channel(dport); + enum pipe pipe = intel_crtc->pipe; + u32 val; + + intel_dp_prepare(encoder); + + mutex_lock(&dev_priv->dpio_lock); + + /* program left/right clock distribution */ + if (pipe != PIPE_B) { + val = vlv_dpio_read(dev_priv, pipe, _CHV_CMN_DW5_CH0); + val &= ~(CHV_BUFLEFTENA1_MASK | CHV_BUFRIGHTENA1_MASK); + if (ch == DPIO_CH0) + val |= CHV_BUFLEFTENA1_FORCE; + if (ch == DPIO_CH1) + val |= CHV_BUFRIGHTENA1_FORCE; + vlv_dpio_write(dev_priv, pipe, _CHV_CMN_DW5_CH0, val); + } else { + val = vlv_dpio_read(dev_priv, pipe, _CHV_CMN_DW1_CH1); + val &= ~(CHV_BUFLEFTENA2_MASK | CHV_BUFRIGHTENA2_MASK); + if (ch == DPIO_CH0) + val |= CHV_BUFLEFTENA2_FORCE; + if (ch == DPIO_CH1) + val |= CHV_BUFRIGHTENA2_FORCE; + vlv_dpio_write(dev_priv, pipe, _CHV_CMN_DW1_CH1, val); + } + + /* program clock channel usage */ + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW8(ch)); + val |= CHV_PCS_USEDCLKCHANNEL_OVRRIDE; + if (pipe != PIPE_B) + val &= ~CHV_PCS_USEDCLKCHANNEL; + else + val |= CHV_PCS_USEDCLKCHANNEL; + vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW8(ch), val); + + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW8(ch)); + val |= CHV_PCS_USEDCLKCHANNEL_OVRRIDE; + if (pipe != PIPE_B) + val &= ~CHV_PCS_USEDCLKCHANNEL; + else + val |= CHV_PCS_USEDCLKCHANNEL; + vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW8(ch), val); + + /* + * This a a bit weird since generally CL + * matches the pipe, but here we need to + * pick the CL based on the port. + */ + val = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW19(ch)); + if (pipe != PIPE_B) + val &= ~CHV_CMN_USEDCLKCHANNEL; + else + val |= CHV_CMN_USEDCLKCHANNEL; + vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW19(ch), val); + + mutex_unlock(&dev_priv->dpio_lock); +} + +/* + * Native read with retry for link status and receiver capability reads for + * cases where the sink may still be asleep. + * + * Sinks are *supposed* to come up within 1ms from an off state, but we're also + * supposed to retry 3 times per the spec. + */ +static ssize_t +intel_dp_dpcd_read_wake(struct drm_dp_aux *aux, unsigned int offset, + void *buffer, size_t size) +{ + ssize_t ret; + int i; + + /* + * Sometime we just get the same incorrect byte repeated + * over the entire buffer. Doing just one throw away read + * initially seems to "solve" it. + */ + drm_dp_dpcd_read(aux, DP_DPCD_REV, buffer, 1); + + for (i = 0; i < 3; i++) { + ret = drm_dp_dpcd_read(aux, offset, buffer, size); + if (ret == size) + return ret; + msleep(1); + } + + return ret; +} + +/* + * Fetch AUX CH registers 0x202 - 0x207 which contain + * link status information + */ +static bool +intel_dp_get_link_status(struct intel_dp *intel_dp, uint8_t link_status[DP_LINK_STATUS_SIZE]) +{ + return intel_dp_dpcd_read_wake(&intel_dp->aux, + DP_LANE0_1_STATUS, + link_status, + DP_LINK_STATUS_SIZE) == DP_LINK_STATUS_SIZE; +} + +/* These are source-specific values. */ +static uint8_t +intel_dp_voltage_max(struct intel_dp *intel_dp) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct drm_i915_private *dev_priv = dev->dev_private; + enum port port = dp_to_dig_port(intel_dp)->port; + + if (INTEL_INFO(dev)->gen >= 9) { + if (dev_priv->vbt.edp_low_vswing && port == PORT_A) + return DP_TRAIN_VOLTAGE_SWING_LEVEL_3; + return DP_TRAIN_VOLTAGE_SWING_LEVEL_2; + } else if (IS_VALLEYVIEW(dev)) + return DP_TRAIN_VOLTAGE_SWING_LEVEL_3; + else if (IS_GEN7(dev) && port == PORT_A) + return DP_TRAIN_VOLTAGE_SWING_LEVEL_2; + else if (HAS_PCH_CPT(dev) && port != PORT_A) + return DP_TRAIN_VOLTAGE_SWING_LEVEL_3; + else + return DP_TRAIN_VOLTAGE_SWING_LEVEL_2; +} + +static uint8_t +intel_dp_pre_emphasis_max(struct intel_dp *intel_dp, uint8_t voltage_swing) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + enum port port = dp_to_dig_port(intel_dp)->port; + + if (INTEL_INFO(dev)->gen >= 9) { + switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) { + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0: + return DP_TRAIN_PRE_EMPH_LEVEL_3; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1: + return DP_TRAIN_PRE_EMPH_LEVEL_2; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_2: + return DP_TRAIN_PRE_EMPH_LEVEL_1; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_3: + return DP_TRAIN_PRE_EMPH_LEVEL_0; + default: + return DP_TRAIN_PRE_EMPH_LEVEL_0; + } + } else if (IS_HASWELL(dev) || IS_BROADWELL(dev)) { + switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) { + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0: + return DP_TRAIN_PRE_EMPH_LEVEL_3; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1: + return DP_TRAIN_PRE_EMPH_LEVEL_2; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_2: + return DP_TRAIN_PRE_EMPH_LEVEL_1; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_3: + default: + return DP_TRAIN_PRE_EMPH_LEVEL_0; + } + } else if (IS_VALLEYVIEW(dev)) { + switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) { + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0: + return DP_TRAIN_PRE_EMPH_LEVEL_3; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1: + return DP_TRAIN_PRE_EMPH_LEVEL_2; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_2: + return DP_TRAIN_PRE_EMPH_LEVEL_1; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_3: + default: + return DP_TRAIN_PRE_EMPH_LEVEL_0; + } + } else if (IS_GEN7(dev) && port == PORT_A) { + switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) { + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0: + return DP_TRAIN_PRE_EMPH_LEVEL_2; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1: + case DP_TRAIN_VOLTAGE_SWING_LEVEL_2: + return DP_TRAIN_PRE_EMPH_LEVEL_1; + default: + return DP_TRAIN_PRE_EMPH_LEVEL_0; + } + } else { + switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) { + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0: + return DP_TRAIN_PRE_EMPH_LEVEL_2; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1: + return DP_TRAIN_PRE_EMPH_LEVEL_2; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_2: + return DP_TRAIN_PRE_EMPH_LEVEL_1; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_3: + default: + return DP_TRAIN_PRE_EMPH_LEVEL_0; + } + } +} + +static uint32_t intel_vlv_signal_levels(struct intel_dp *intel_dp) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_digital_port *dport = dp_to_dig_port(intel_dp); + struct intel_crtc *intel_crtc = + to_intel_crtc(dport->base.base.crtc); + unsigned long demph_reg_value, preemph_reg_value, + uniqtranscale_reg_value; + uint8_t train_set = intel_dp->train_set[0]; + enum dpio_channel port = vlv_dport_to_channel(dport); + int pipe = intel_crtc->pipe; + + switch (train_set & DP_TRAIN_PRE_EMPHASIS_MASK) { + case DP_TRAIN_PRE_EMPH_LEVEL_0: + preemph_reg_value = 0x0004000; + switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) { + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0: + demph_reg_value = 0x2B405555; + uniqtranscale_reg_value = 0x552AB83A; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1: + demph_reg_value = 0x2B404040; + uniqtranscale_reg_value = 0x5548B83A; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_2: + demph_reg_value = 0x2B245555; + uniqtranscale_reg_value = 0x5560B83A; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_3: + demph_reg_value = 0x2B405555; + uniqtranscale_reg_value = 0x5598DA3A; + break; + default: + return 0; + } + break; + case DP_TRAIN_PRE_EMPH_LEVEL_1: + preemph_reg_value = 0x0002000; + switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) { + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0: + demph_reg_value = 0x2B404040; + uniqtranscale_reg_value = 0x5552B83A; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1: + demph_reg_value = 0x2B404848; + uniqtranscale_reg_value = 0x5580B83A; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_2: + demph_reg_value = 0x2B404040; + uniqtranscale_reg_value = 0x55ADDA3A; + break; + default: + return 0; + } + break; + case DP_TRAIN_PRE_EMPH_LEVEL_2: + preemph_reg_value = 0x0000000; + switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) { + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0: + demph_reg_value = 0x2B305555; + uniqtranscale_reg_value = 0x5570B83A; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1: + demph_reg_value = 0x2B2B4040; + uniqtranscale_reg_value = 0x55ADDA3A; + break; + default: + return 0; + } + break; + case DP_TRAIN_PRE_EMPH_LEVEL_3: + preemph_reg_value = 0x0006000; + switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) { + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0: + demph_reg_value = 0x1B405555; + uniqtranscale_reg_value = 0x55ADDA3A; + break; + default: + return 0; + } + break; + default: + return 0; + } + + mutex_lock(&dev_priv->dpio_lock); + vlv_dpio_write(dev_priv, pipe, VLV_TX_DW5(port), 0x00000000); + vlv_dpio_write(dev_priv, pipe, VLV_TX_DW4(port), demph_reg_value); + vlv_dpio_write(dev_priv, pipe, VLV_TX_DW2(port), + uniqtranscale_reg_value); + vlv_dpio_write(dev_priv, pipe, VLV_TX_DW3(port), 0x0C782040); + vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW11(port), 0x00030000); + vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW9(port), preemph_reg_value); + vlv_dpio_write(dev_priv, pipe, VLV_TX_DW5(port), 0x80000000); + mutex_unlock(&dev_priv->dpio_lock); + + return 0; +} + +static uint32_t intel_chv_signal_levels(struct intel_dp *intel_dp) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_digital_port *dport = dp_to_dig_port(intel_dp); + struct intel_crtc *intel_crtc = to_intel_crtc(dport->base.base.crtc); + u32 deemph_reg_value, margin_reg_value, val; + uint8_t train_set = intel_dp->train_set[0]; + enum dpio_channel ch = vlv_dport_to_channel(dport); + enum pipe pipe = intel_crtc->pipe; + int i; + + switch (train_set & DP_TRAIN_PRE_EMPHASIS_MASK) { + case DP_TRAIN_PRE_EMPH_LEVEL_0: + switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) { + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0: + deemph_reg_value = 128; + margin_reg_value = 52; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1: + deemph_reg_value = 128; + margin_reg_value = 77; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_2: + deemph_reg_value = 128; + margin_reg_value = 102; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_3: + deemph_reg_value = 128; + margin_reg_value = 154; + /* FIXME extra to set for 1200 */ + break; + default: + return 0; + } + break; + case DP_TRAIN_PRE_EMPH_LEVEL_1: + switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) { + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0: + deemph_reg_value = 85; + margin_reg_value = 78; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1: + deemph_reg_value = 85; + margin_reg_value = 116; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_2: + deemph_reg_value = 85; + margin_reg_value = 154; + break; + default: + return 0; + } + break; + case DP_TRAIN_PRE_EMPH_LEVEL_2: + switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) { + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0: + deemph_reg_value = 64; + margin_reg_value = 104; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1: + deemph_reg_value = 64; + margin_reg_value = 154; + break; + default: + return 0; + } + break; + case DP_TRAIN_PRE_EMPH_LEVEL_3: + switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) { + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0: + deemph_reg_value = 43; + margin_reg_value = 154; + break; + default: + return 0; + } + break; + default: + return 0; + } + + mutex_lock(&dev_priv->dpio_lock); + + /* Clear calc init */ + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW10(ch)); + val &= ~(DPIO_PCS_SWING_CALC_TX0_TX2 | DPIO_PCS_SWING_CALC_TX1_TX3); + val &= ~(DPIO_PCS_TX1DEEMP_MASK | DPIO_PCS_TX2DEEMP_MASK); + val |= DPIO_PCS_TX1DEEMP_9P5 | DPIO_PCS_TX2DEEMP_9P5; + vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW10(ch), val); + + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW10(ch)); + val &= ~(DPIO_PCS_SWING_CALC_TX0_TX2 | DPIO_PCS_SWING_CALC_TX1_TX3); + val &= ~(DPIO_PCS_TX1DEEMP_MASK | DPIO_PCS_TX2DEEMP_MASK); + val |= DPIO_PCS_TX1DEEMP_9P5 | DPIO_PCS_TX2DEEMP_9P5; + vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW10(ch), val); + + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW9(ch)); + val &= ~(DPIO_PCS_TX1MARGIN_MASK | DPIO_PCS_TX2MARGIN_MASK); + val |= DPIO_PCS_TX1MARGIN_000 | DPIO_PCS_TX2MARGIN_000; + vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW9(ch), val); + + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW9(ch)); + val &= ~(DPIO_PCS_TX1MARGIN_MASK | DPIO_PCS_TX2MARGIN_MASK); + val |= DPIO_PCS_TX1MARGIN_000 | DPIO_PCS_TX2MARGIN_000; + vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW9(ch), val); + + /* Program swing deemph */ + for (i = 0; i < 4; i++) { + val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW4(ch, i)); + val &= ~DPIO_SWING_DEEMPH9P5_MASK; + val |= deemph_reg_value << DPIO_SWING_DEEMPH9P5_SHIFT; + vlv_dpio_write(dev_priv, pipe, CHV_TX_DW4(ch, i), val); + } + + /* Program swing margin */ + for (i = 0; i < 4; i++) { + val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW2(ch, i)); + val &= ~DPIO_SWING_MARGIN000_MASK; + val |= margin_reg_value << DPIO_SWING_MARGIN000_SHIFT; + vlv_dpio_write(dev_priv, pipe, CHV_TX_DW2(ch, i), val); + } + + /* Disable unique transition scale */ + for (i = 0; i < 4; i++) { + val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW3(ch, i)); + val &= ~DPIO_TX_UNIQ_TRANS_SCALE_EN; + vlv_dpio_write(dev_priv, pipe, CHV_TX_DW3(ch, i), val); + } + + if (((train_set & DP_TRAIN_PRE_EMPHASIS_MASK) + == DP_TRAIN_PRE_EMPH_LEVEL_0) && + ((train_set & DP_TRAIN_VOLTAGE_SWING_MASK) + == DP_TRAIN_VOLTAGE_SWING_LEVEL_3)) { + + /* + * The document said it needs to set bit 27 for ch0 and bit 26 + * for ch1. Might be a typo in the doc. + * For now, for this unique transition scale selection, set bit + * 27 for ch0 and ch1. + */ + for (i = 0; i < 4; i++) { + val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW3(ch, i)); + val |= DPIO_TX_UNIQ_TRANS_SCALE_EN; + vlv_dpio_write(dev_priv, pipe, CHV_TX_DW3(ch, i), val); + } + + for (i = 0; i < 4; i++) { + val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW2(ch, i)); + val &= ~(0xff << DPIO_UNIQ_TRANS_SCALE_SHIFT); + val |= (0x9a << DPIO_UNIQ_TRANS_SCALE_SHIFT); + vlv_dpio_write(dev_priv, pipe, CHV_TX_DW2(ch, i), val); + } + } + + /* Start swing calculation */ + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW10(ch)); + val |= DPIO_PCS_SWING_CALC_TX0_TX2 | DPIO_PCS_SWING_CALC_TX1_TX3; + vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW10(ch), val); + + val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW10(ch)); + val |= DPIO_PCS_SWING_CALC_TX0_TX2 | DPIO_PCS_SWING_CALC_TX1_TX3; + vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW10(ch), val); + + /* LRC Bypass */ + val = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW30); + val |= DPIO_LRC_BYPASS; + vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW30, val); + + mutex_unlock(&dev_priv->dpio_lock); + + return 0; +} + +static void +intel_get_adjust_train(struct intel_dp *intel_dp, + const uint8_t link_status[DP_LINK_STATUS_SIZE]) +{ + uint8_t v = 0; + uint8_t p = 0; + int lane; + uint8_t voltage_max; + uint8_t preemph_max; + + for (lane = 0; lane < intel_dp->lane_count; lane++) { + uint8_t this_v = drm_dp_get_adjust_request_voltage(link_status, lane); + uint8_t this_p = drm_dp_get_adjust_request_pre_emphasis(link_status, lane); + + if (this_v > v) + v = this_v; + if (this_p > p) + p = this_p; + } + + voltage_max = intel_dp_voltage_max(intel_dp); + if (v >= voltage_max) + v = voltage_max | DP_TRAIN_MAX_SWING_REACHED; + + preemph_max = intel_dp_pre_emphasis_max(intel_dp, v); + if (p >= preemph_max) + p = preemph_max | DP_TRAIN_MAX_PRE_EMPHASIS_REACHED; + + for (lane = 0; lane < 4; lane++) + intel_dp->train_set[lane] = v | p; +} + +static uint32_t +intel_gen4_signal_levels(uint8_t train_set) +{ + uint32_t signal_levels = 0; + + switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) { + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0: + default: + signal_levels |= DP_VOLTAGE_0_4; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1: + signal_levels |= DP_VOLTAGE_0_6; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_2: + signal_levels |= DP_VOLTAGE_0_8; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_3: + signal_levels |= DP_VOLTAGE_1_2; + break; + } + switch (train_set & DP_TRAIN_PRE_EMPHASIS_MASK) { + case DP_TRAIN_PRE_EMPH_LEVEL_0: + default: + signal_levels |= DP_PRE_EMPHASIS_0; + break; + case DP_TRAIN_PRE_EMPH_LEVEL_1: + signal_levels |= DP_PRE_EMPHASIS_3_5; + break; + case DP_TRAIN_PRE_EMPH_LEVEL_2: + signal_levels |= DP_PRE_EMPHASIS_6; + break; + case DP_TRAIN_PRE_EMPH_LEVEL_3: + signal_levels |= DP_PRE_EMPHASIS_9_5; + break; + } + return signal_levels; +} + +/* Gen6's DP voltage swing and pre-emphasis control */ +static uint32_t +intel_gen6_edp_signal_levels(uint8_t train_set) +{ + int signal_levels = train_set & (DP_TRAIN_VOLTAGE_SWING_MASK | + DP_TRAIN_PRE_EMPHASIS_MASK); + switch (signal_levels) { + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_0: + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1 | DP_TRAIN_PRE_EMPH_LEVEL_0: + return EDP_LINK_TRAIN_400_600MV_0DB_SNB_B; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_1: + return EDP_LINK_TRAIN_400MV_3_5DB_SNB_B; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_2: + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1 | DP_TRAIN_PRE_EMPH_LEVEL_2: + return EDP_LINK_TRAIN_400_600MV_6DB_SNB_B; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1 | DP_TRAIN_PRE_EMPH_LEVEL_1: + case DP_TRAIN_VOLTAGE_SWING_LEVEL_2 | DP_TRAIN_PRE_EMPH_LEVEL_1: + return EDP_LINK_TRAIN_600_800MV_3_5DB_SNB_B; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_2 | DP_TRAIN_PRE_EMPH_LEVEL_0: + case DP_TRAIN_VOLTAGE_SWING_LEVEL_3 | DP_TRAIN_PRE_EMPH_LEVEL_0: + return EDP_LINK_TRAIN_800_1200MV_0DB_SNB_B; + default: + DRM_DEBUG_KMS("Unsupported voltage swing/pre-emphasis level:" + "0x%x\n", signal_levels); + return EDP_LINK_TRAIN_400_600MV_0DB_SNB_B; + } +} + +/* Gen7's DP voltage swing and pre-emphasis control */ +static uint32_t +intel_gen7_edp_signal_levels(uint8_t train_set) +{ + int signal_levels = train_set & (DP_TRAIN_VOLTAGE_SWING_MASK | + DP_TRAIN_PRE_EMPHASIS_MASK); + switch (signal_levels) { + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_0: + return EDP_LINK_TRAIN_400MV_0DB_IVB; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_1: + return EDP_LINK_TRAIN_400MV_3_5DB_IVB; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_2: + return EDP_LINK_TRAIN_400MV_6DB_IVB; + + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1 | DP_TRAIN_PRE_EMPH_LEVEL_0: + return EDP_LINK_TRAIN_600MV_0DB_IVB; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1 | DP_TRAIN_PRE_EMPH_LEVEL_1: + return EDP_LINK_TRAIN_600MV_3_5DB_IVB; + + case DP_TRAIN_VOLTAGE_SWING_LEVEL_2 | DP_TRAIN_PRE_EMPH_LEVEL_0: + return EDP_LINK_TRAIN_800MV_0DB_IVB; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_2 | DP_TRAIN_PRE_EMPH_LEVEL_1: + return EDP_LINK_TRAIN_800MV_3_5DB_IVB; + + default: + DRM_DEBUG_KMS("Unsupported voltage swing/pre-emphasis level:" + "0x%x\n", signal_levels); + return EDP_LINK_TRAIN_500MV_0DB_IVB; + } +} + +/* Gen7.5's (HSW) DP voltage swing and pre-emphasis control */ +static uint32_t +intel_hsw_signal_levels(uint8_t train_set) +{ + int signal_levels = train_set & (DP_TRAIN_VOLTAGE_SWING_MASK | + DP_TRAIN_PRE_EMPHASIS_MASK); + switch (signal_levels) { + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_0: + return DDI_BUF_TRANS_SELECT(0); + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_1: + return DDI_BUF_TRANS_SELECT(1); + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_2: + return DDI_BUF_TRANS_SELECT(2); + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_3: + return DDI_BUF_TRANS_SELECT(3); + + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1 | DP_TRAIN_PRE_EMPH_LEVEL_0: + return DDI_BUF_TRANS_SELECT(4); + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1 | DP_TRAIN_PRE_EMPH_LEVEL_1: + return DDI_BUF_TRANS_SELECT(5); + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1 | DP_TRAIN_PRE_EMPH_LEVEL_2: + return DDI_BUF_TRANS_SELECT(6); + + case DP_TRAIN_VOLTAGE_SWING_LEVEL_2 | DP_TRAIN_PRE_EMPH_LEVEL_0: + return DDI_BUF_TRANS_SELECT(7); + case DP_TRAIN_VOLTAGE_SWING_LEVEL_2 | DP_TRAIN_PRE_EMPH_LEVEL_1: + return DDI_BUF_TRANS_SELECT(8); + + case DP_TRAIN_VOLTAGE_SWING_LEVEL_3 | DP_TRAIN_PRE_EMPH_LEVEL_0: + return DDI_BUF_TRANS_SELECT(9); + default: + DRM_DEBUG_KMS("Unsupported voltage swing/pre-emphasis level:" + "0x%x\n", signal_levels); + return DDI_BUF_TRANS_SELECT(0); + } +} + +/* Properly updates "DP" with the correct signal levels. */ +static void +intel_dp_set_signal_levels(struct intel_dp *intel_dp, uint32_t *DP) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + enum port port = intel_dig_port->port; + struct drm_device *dev = intel_dig_port->base.base.dev; + uint32_t signal_levels, mask; + uint8_t train_set = intel_dp->train_set[0]; + + if (IS_HASWELL(dev) || IS_BROADWELL(dev) || INTEL_INFO(dev)->gen >= 9) { + signal_levels = intel_hsw_signal_levels(train_set); + mask = DDI_BUF_EMP_MASK; + } else if (IS_CHERRYVIEW(dev)) { + signal_levels = intel_chv_signal_levels(intel_dp); + mask = 0; + } else if (IS_VALLEYVIEW(dev)) { + signal_levels = intel_vlv_signal_levels(intel_dp); + mask = 0; + } else if (IS_GEN7(dev) && port == PORT_A) { + signal_levels = intel_gen7_edp_signal_levels(train_set); + mask = EDP_LINK_TRAIN_VOL_EMP_MASK_IVB; + } else if (IS_GEN6(dev) && port == PORT_A) { + signal_levels = intel_gen6_edp_signal_levels(train_set); + mask = EDP_LINK_TRAIN_VOL_EMP_MASK_SNB; + } else { + signal_levels = intel_gen4_signal_levels(train_set); + mask = DP_VOLTAGE_MASK | DP_PRE_EMPHASIS_MASK; + } + + DRM_DEBUG_KMS("Using signal levels %08x\n", signal_levels); + + *DP = (*DP & ~mask) | signal_levels; +} + +static bool +intel_dp_set_link_train(struct intel_dp *intel_dp, + uint32_t *DP, + uint8_t dp_train_pat) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct drm_device *dev = intel_dig_port->base.base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + uint8_t buf[sizeof(intel_dp->train_set) + 1]; + int ret, len; + + _intel_dp_set_link_train(intel_dp, DP, dp_train_pat); + + I915_WRITE(intel_dp->output_reg, *DP); + POSTING_READ(intel_dp->output_reg); + + buf[0] = dp_train_pat; + if ((dp_train_pat & DP_TRAINING_PATTERN_MASK) == + DP_TRAINING_PATTERN_DISABLE) { + /* don't write DP_TRAINING_LANEx_SET on disable */ + len = 1; + } else { + /* DP_TRAINING_LANEx_SET follow DP_TRAINING_PATTERN_SET */ + memcpy(buf + 1, intel_dp->train_set, intel_dp->lane_count); + len = intel_dp->lane_count + 1; + } + + ret = drm_dp_dpcd_write(&intel_dp->aux, DP_TRAINING_PATTERN_SET, + buf, len); + + return ret == len; +} + +static bool +intel_dp_reset_link_train(struct intel_dp *intel_dp, uint32_t *DP, + uint8_t dp_train_pat) +{ + memset(intel_dp->train_set, 0, sizeof(intel_dp->train_set)); + intel_dp_set_signal_levels(intel_dp, DP); + return intel_dp_set_link_train(intel_dp, DP, dp_train_pat); +} + +static bool +intel_dp_update_link_train(struct intel_dp *intel_dp, uint32_t *DP, + const uint8_t link_status[DP_LINK_STATUS_SIZE]) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct drm_device *dev = intel_dig_port->base.base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + int ret; + + intel_get_adjust_train(intel_dp, link_status); + intel_dp_set_signal_levels(intel_dp, DP); + + I915_WRITE(intel_dp->output_reg, *DP); + POSTING_READ(intel_dp->output_reg); + + ret = drm_dp_dpcd_write(&intel_dp->aux, DP_TRAINING_LANE0_SET, + intel_dp->train_set, intel_dp->lane_count); + + return ret == intel_dp->lane_count; +} + +static void intel_dp_set_idle_link_train(struct intel_dp *intel_dp) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct drm_device *dev = intel_dig_port->base.base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + enum port port = intel_dig_port->port; + uint32_t val; + + if (!HAS_DDI(dev)) + return; + + val = I915_READ(DP_TP_CTL(port)); + val &= ~DP_TP_CTL_LINK_TRAIN_MASK; + val |= DP_TP_CTL_LINK_TRAIN_IDLE; + I915_WRITE(DP_TP_CTL(port), val); + + /* + * On PORT_A we can have only eDP in SST mode. There the only reason + * we need to set idle transmission mode is to work around a HW issue + * where we enable the pipe while not in idle link-training mode. + * In this case there is requirement to wait for a minimum number of + * idle patterns to be sent. + */ + if (port == PORT_A) + return; + + if (wait_for((I915_READ(DP_TP_STATUS(port)) & DP_TP_STATUS_IDLE_DONE), + 1)) + DRM_ERROR("Timed out waiting for DP idle patterns\n"); +} + +/* Enable corresponding port and start training pattern 1 */ +void +intel_dp_start_link_train(struct intel_dp *intel_dp) +{ + struct drm_encoder *encoder = &dp_to_dig_port(intel_dp)->base.base; + struct drm_device *dev = encoder->dev; + int i; + uint8_t voltage; + int voltage_tries, loop_tries; + uint32_t DP = intel_dp->DP; + uint8_t link_config[2]; + + if (HAS_DDI(dev)) + intel_ddi_prepare_link_retrain(encoder); + + /* Write the link configuration data */ + link_config[0] = intel_dp->link_bw; + link_config[1] = intel_dp->lane_count; + if (drm_dp_enhanced_frame_cap(intel_dp->dpcd)) + link_config[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN; + drm_dp_dpcd_write(&intel_dp->aux, DP_LINK_BW_SET, link_config, 2); + if (intel_dp->num_sink_rates) + drm_dp_dpcd_write(&intel_dp->aux, DP_LINK_RATE_SET, + &intel_dp->rate_select, 1); + + link_config[0] = 0; + link_config[1] = DP_SET_ANSI_8B10B; + drm_dp_dpcd_write(&intel_dp->aux, DP_DOWNSPREAD_CTRL, link_config, 2); + + DP |= DP_PORT_EN; + + /* clock recovery */ + if (!intel_dp_reset_link_train(intel_dp, &DP, + DP_TRAINING_PATTERN_1 | + DP_LINK_SCRAMBLING_DISABLE)) { + DRM_ERROR("failed to enable link training\n"); + return; + } + + voltage = 0xff; + voltage_tries = 0; + loop_tries = 0; + for (;;) { + uint8_t link_status[DP_LINK_STATUS_SIZE]; + + drm_dp_link_train_clock_recovery_delay(intel_dp->dpcd); + if (!intel_dp_get_link_status(intel_dp, link_status)) { + DRM_ERROR("failed to get link status\n"); + break; + } + + if (drm_dp_clock_recovery_ok(link_status, intel_dp->lane_count)) { + DRM_DEBUG_KMS("clock recovery OK\n"); + break; + } + + /* Check to see if we've tried the max voltage */ + for (i = 0; i < intel_dp->lane_count; i++) + if ((intel_dp->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0) + break; + if (i == intel_dp->lane_count) { + ++loop_tries; + if (loop_tries == 5) { + DRM_ERROR("too many full retries, give up\n"); + break; + } + intel_dp_reset_link_train(intel_dp, &DP, + DP_TRAINING_PATTERN_1 | + DP_LINK_SCRAMBLING_DISABLE); + voltage_tries = 0; + continue; + } + + /* Check to see if we've tried the same voltage 5 times */ + if ((intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) { + ++voltage_tries; + if (voltage_tries == 5) { + DRM_ERROR("too many voltage retries, give up\n"); + break; + } + } else + voltage_tries = 0; + voltage = intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK; + + /* Update training set as requested by target */ + if (!intel_dp_update_link_train(intel_dp, &DP, link_status)) { + DRM_ERROR("failed to update link training\n"); + break; + } + } + + intel_dp->DP = DP; +} + +void +intel_dp_complete_link_train(struct intel_dp *intel_dp) +{ + bool channel_eq = false; + int tries, cr_tries; + uint32_t DP = intel_dp->DP; + uint32_t training_pattern = DP_TRAINING_PATTERN_2; + + /* Training Pattern 3 for HBR2 ot 1.2 devices that support it*/ + if (intel_dp->link_bw == DP_LINK_BW_5_4 || intel_dp->use_tps3) + training_pattern = DP_TRAINING_PATTERN_3; + + /* channel equalization */ + if (!intel_dp_set_link_train(intel_dp, &DP, + training_pattern | + DP_LINK_SCRAMBLING_DISABLE)) { + DRM_ERROR("failed to start channel equalization\n"); + return; + } + + tries = 0; + cr_tries = 0; + channel_eq = false; + for (;;) { + uint8_t link_status[DP_LINK_STATUS_SIZE]; + + if (cr_tries > 5) { + DRM_ERROR("failed to train DP, aborting\n"); + break; + } + + drm_dp_link_train_channel_eq_delay(intel_dp->dpcd); + if (!intel_dp_get_link_status(intel_dp, link_status)) { + DRM_ERROR("failed to get link status\n"); + break; + } + + /* Make sure clock is still ok */ + if (!drm_dp_clock_recovery_ok(link_status, intel_dp->lane_count)) { + intel_dp_start_link_train(intel_dp); + intel_dp_set_link_train(intel_dp, &DP, + training_pattern | + DP_LINK_SCRAMBLING_DISABLE); + cr_tries++; + continue; + } + + if (drm_dp_channel_eq_ok(link_status, intel_dp->lane_count)) { + channel_eq = true; + break; + } + + /* Try 5 times, then try clock recovery if that fails */ + if (tries > 5) { + intel_dp_start_link_train(intel_dp); + intel_dp_set_link_train(intel_dp, &DP, + training_pattern | + DP_LINK_SCRAMBLING_DISABLE); + tries = 0; + cr_tries++; + continue; + } + + /* Update training set as requested by target */ + if (!intel_dp_update_link_train(intel_dp, &DP, link_status)) { + DRM_ERROR("failed to update link training\n"); + break; + } + ++tries; + } + + intel_dp_set_idle_link_train(intel_dp); + + intel_dp->DP = DP; + + if (channel_eq) + DRM_DEBUG_KMS("Channel EQ done. DP Training successful\n"); + +} + +void intel_dp_stop_link_train(struct intel_dp *intel_dp) +{ + intel_dp_set_link_train(intel_dp, &intel_dp->DP, + DP_TRAINING_PATTERN_DISABLE); +} + +static void +intel_dp_link_down(struct intel_dp *intel_dp) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + enum port port = intel_dig_port->port; + struct drm_device *dev = intel_dig_port->base.base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + uint32_t DP = intel_dp->DP; + + if (WARN_ON(HAS_DDI(dev))) + return; + + if (WARN_ON((I915_READ(intel_dp->output_reg) & DP_PORT_EN) == 0)) + return; + + DRM_DEBUG_KMS("\n"); + + if (HAS_PCH_CPT(dev) && (IS_GEN7(dev) || port != PORT_A)) { + DP &= ~DP_LINK_TRAIN_MASK_CPT; + I915_WRITE(intel_dp->output_reg, DP | DP_LINK_TRAIN_PAT_IDLE_CPT); + } else { + if (IS_CHERRYVIEW(dev)) + DP &= ~DP_LINK_TRAIN_MASK_CHV; + else + DP &= ~DP_LINK_TRAIN_MASK; + I915_WRITE(intel_dp->output_reg, DP | DP_LINK_TRAIN_PAT_IDLE); + } + POSTING_READ(intel_dp->output_reg); + + if (HAS_PCH_IBX(dev) && + I915_READ(intel_dp->output_reg) & DP_PIPEB_SELECT) { + /* Hardware workaround: leaving our transcoder select + * set to transcoder B while it's off will prevent the + * corresponding HDMI output on transcoder A. + * + * Combine this with another hardware workaround: + * transcoder select bit can only be cleared while the + * port is enabled. + */ + DP &= ~DP_PIPEB_SELECT; + I915_WRITE(intel_dp->output_reg, DP); + POSTING_READ(intel_dp->output_reg); + } + + DP &= ~DP_AUDIO_OUTPUT_ENABLE; + I915_WRITE(intel_dp->output_reg, DP & ~DP_PORT_EN); + POSTING_READ(intel_dp->output_reg); + msleep(intel_dp->panel_power_down_delay); +} + +static bool +intel_dp_get_dpcd(struct intel_dp *intel_dp) +{ + struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp); + struct drm_device *dev = dig_port->base.base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + uint8_t rev; + + if (intel_dp_dpcd_read_wake(&intel_dp->aux, 0x000, intel_dp->dpcd, + sizeof(intel_dp->dpcd)) < 0) + return false; /* aux transfer failed */ + + DRM_DEBUG_KMS("DPCD: %*ph\n", (int) sizeof(intel_dp->dpcd), intel_dp->dpcd); + + if (intel_dp->dpcd[DP_DPCD_REV] == 0) + return false; /* DPCD not present */ + + /* Check if the panel supports PSR */ + memset(intel_dp->psr_dpcd, 0, sizeof(intel_dp->psr_dpcd)); + if (is_edp(intel_dp)) { + intel_dp_dpcd_read_wake(&intel_dp->aux, DP_PSR_SUPPORT, + intel_dp->psr_dpcd, + sizeof(intel_dp->psr_dpcd)); + if (intel_dp->psr_dpcd[0] & DP_PSR_IS_SUPPORTED) { + dev_priv->psr.sink_support = true; + DRM_DEBUG_KMS("Detected EDP PSR Panel.\n"); + } + } + + /* Training Pattern 3 support, both source and sink */ + if (intel_dp->dpcd[DP_DPCD_REV] >= 0x12 && + intel_dp->dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED && + (IS_HASWELL(dev_priv) || INTEL_INFO(dev_priv)->gen >= 8)) { + intel_dp->use_tps3 = true; + DRM_DEBUG_KMS("Displayport TPS3 supported\n"); + } else + intel_dp->use_tps3 = false; + + /* Intermediate frequency support */ + if (is_edp(intel_dp) && + (intel_dp->dpcd[DP_EDP_CONFIGURATION_CAP] & DP_DPCD_DISPLAY_CONTROL_CAPABLE) && + (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_EDP_DPCD_REV, &rev, 1) == 1) && + (rev >= 0x03)) { /* eDp v1.4 or higher */ + __le16 sink_rates[DP_MAX_SUPPORTED_RATES]; + int i; + + intel_dp_dpcd_read_wake(&intel_dp->aux, + DP_SUPPORTED_LINK_RATES, + sink_rates, + sizeof(sink_rates)); + + for (i = 0; i < ARRAY_SIZE(sink_rates); i++) { + int val = le16_to_cpu(sink_rates[i]); + + if (val == 0) + break; + + /* Value read is in kHz while drm clock is saved in deca-kHz */ + intel_dp->sink_rates[i] = (val * 200) / 10; + } + intel_dp->num_sink_rates = i; + } + + intel_dp_print_rates(intel_dp); + + if (!(intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] & + DP_DWN_STRM_PORT_PRESENT)) + return true; /* native DP sink */ + + if (intel_dp->dpcd[DP_DPCD_REV] == 0x10) + return true; /* no per-port downstream info */ + + if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_DOWNSTREAM_PORT_0, + intel_dp->downstream_ports, + DP_MAX_DOWNSTREAM_PORTS) < 0) + return false; /* downstream port status fetch failed */ + + return true; +} + +static void +intel_dp_probe_oui(struct intel_dp *intel_dp) +{ + u8 buf[3]; + + if (!(intel_dp->dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT)) + return; + + if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_SINK_OUI, buf, 3) == 3) + DRM_DEBUG_KMS("Sink OUI: %02hx%02hx%02hx\n", + buf[0], buf[1], buf[2]); + + if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_BRANCH_OUI, buf, 3) == 3) + DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n", + buf[0], buf[1], buf[2]); +} + +static bool +intel_dp_probe_mst(struct intel_dp *intel_dp) +{ + u8 buf[1]; + + if (!intel_dp->can_mst) + return false; + + if (intel_dp->dpcd[DP_DPCD_REV] < 0x12) + return false; + + if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_MSTM_CAP, buf, 1)) { + if (buf[0] & DP_MST_CAP) { + DRM_DEBUG_KMS("Sink is MST capable\n"); + intel_dp->is_mst = true; + } else { + DRM_DEBUG_KMS("Sink is not MST capable\n"); + intel_dp->is_mst = false; + } + } + + drm_dp_mst_topology_mgr_set_mst(&intel_dp->mst_mgr, intel_dp->is_mst); + return intel_dp->is_mst; +} + +int intel_dp_sink_crc(struct intel_dp *intel_dp, u8 *crc) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct drm_device *dev = intel_dig_port->base.base.dev; + struct intel_crtc *intel_crtc = + to_intel_crtc(intel_dig_port->base.base.crtc); + u8 buf; + int test_crc_count; + int attempts = 6; + + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) + return -EIO; + + if (!(buf & DP_TEST_CRC_SUPPORTED)) + return -ENOTTY; + + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) + return -EIO; + + if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK, + buf | DP_TEST_SINK_START) < 0) + return -EIO; + + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0) + return -EIO; + test_crc_count = buf & DP_TEST_COUNT_MASK; + + do { + if (drm_dp_dpcd_readb(&intel_dp->aux, + DP_TEST_SINK_MISC, &buf) < 0) + return -EIO; + intel_wait_for_vblank(dev, intel_crtc->pipe); + } while (--attempts && (buf & DP_TEST_COUNT_MASK) == test_crc_count); + + if (attempts == 0) { + DRM_DEBUG_KMS("Panel is unable to calculate CRC after 6 vblanks\n"); + return -ETIMEDOUT; + } + + if (drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_CRC_R_CR, crc, 6) < 0) + return -EIO; + + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) + return -EIO; + if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK, + buf & ~DP_TEST_SINK_START) < 0) + return -EIO; + + return 0; +} + +static bool +intel_dp_get_sink_irq(struct intel_dp *intel_dp, u8 *sink_irq_vector) +{ + return intel_dp_dpcd_read_wake(&intel_dp->aux, + DP_DEVICE_SERVICE_IRQ_VECTOR, + sink_irq_vector, 1) == 1; +} + +static bool +intel_dp_get_sink_irq_esi(struct intel_dp *intel_dp, u8 *sink_irq_vector) +{ + int ret; + + ret = intel_dp_dpcd_read_wake(&intel_dp->aux, + DP_SINK_COUNT_ESI, + sink_irq_vector, 14); + if (ret != 14) + return false; + + return true; +} + +static void +intel_dp_handle_test_request(struct intel_dp *intel_dp) +{ + /* NAK by default */ + drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_RESPONSE, DP_TEST_NAK); +} + +static int +intel_dp_check_mst_status(struct intel_dp *intel_dp) +{ + bool bret; + + if (intel_dp->is_mst) { + u8 esi[16] = { 0 }; + int ret = 0; + int retry; + bool handled; + bret = intel_dp_get_sink_irq_esi(intel_dp, esi); +go_again: + if (bret == true) { + + /* check link status - esi[10] = 0x200c */ + if (intel_dp->active_mst_links && !drm_dp_channel_eq_ok(&esi[10], intel_dp->lane_count)) { + DRM_DEBUG_KMS("channel EQ not ok, retraining\n"); + intel_dp_start_link_train(intel_dp); + intel_dp_complete_link_train(intel_dp); + intel_dp_stop_link_train(intel_dp); + } + + DRM_DEBUG_KMS("got esi %3ph\n", esi); + ret = drm_dp_mst_hpd_irq(&intel_dp->mst_mgr, esi, &handled); + + if (handled) { + for (retry = 0; retry < 3; retry++) { + int wret; + wret = drm_dp_dpcd_write(&intel_dp->aux, + DP_SINK_COUNT_ESI+1, + &esi[1], 3); + if (wret == 3) { + break; + } + } + + bret = intel_dp_get_sink_irq_esi(intel_dp, esi); + if (bret == true) { + DRM_DEBUG_KMS("got esi2 %3ph\n", esi); + goto go_again; + } + } else + ret = 0; + + return ret; + } else { + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + DRM_DEBUG_KMS("failed to get ESI - device may have failed\n"); + intel_dp->is_mst = false; + drm_dp_mst_topology_mgr_set_mst(&intel_dp->mst_mgr, intel_dp->is_mst); + /* send a hotplug event */ + drm_kms_helper_hotplug_event(intel_dig_port->base.base.dev); + } + } + return -EINVAL; +} + +/* + * According to DP spec + * 5.1.2: + * 1. Read DPCD + * 2. Configure link according to Receiver Capabilities + * 3. Use Link Training from 2.5.3.3 and 3.5.1.3 + * 4. Check link status on receipt of hot-plug interrupt + */ +static void +intel_dp_check_link_status(struct intel_dp *intel_dp) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct intel_encoder *intel_encoder = &dp_to_dig_port(intel_dp)->base; + u8 sink_irq_vector; + u8 link_status[DP_LINK_STATUS_SIZE]; + + WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex)); + + if (!intel_encoder->connectors_active) + return; + + if (WARN_ON(!intel_encoder->base.crtc)) + return; + + if (!to_intel_crtc(intel_encoder->base.crtc)->active) + return; + + /* Try to read receiver status if the link appears to be up */ + if (!intel_dp_get_link_status(intel_dp, link_status)) { + return; + } + + /* Now read the DPCD to see if it's actually running */ + if (!intel_dp_get_dpcd(intel_dp)) { + return; + } + + /* Try to read the source of the interrupt */ + if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11 && + intel_dp_get_sink_irq(intel_dp, &sink_irq_vector)) { + /* Clear interrupt source */ + drm_dp_dpcd_writeb(&intel_dp->aux, + DP_DEVICE_SERVICE_IRQ_VECTOR, + sink_irq_vector); + + if (sink_irq_vector & DP_AUTOMATED_TEST_REQUEST) + intel_dp_handle_test_request(intel_dp); + if (sink_irq_vector & (DP_CP_IRQ | DP_SINK_SPECIFIC_IRQ)) + DRM_DEBUG_DRIVER("CP or sink specific irq unhandled\n"); + } + + if (!drm_dp_channel_eq_ok(link_status, intel_dp->lane_count)) { + DRM_DEBUG_KMS("%s: channel EQ not ok, retraining\n", + intel_encoder->base.name); + intel_dp_start_link_train(intel_dp); + intel_dp_complete_link_train(intel_dp); + intel_dp_stop_link_train(intel_dp); + } +} + +/* XXX this is probably wrong for multiple downstream ports */ +static enum drm_connector_status +intel_dp_detect_dpcd(struct intel_dp *intel_dp) +{ + uint8_t *dpcd = intel_dp->dpcd; + uint8_t type; + + if (!intel_dp_get_dpcd(intel_dp)) + return connector_status_disconnected; + + /* if there's no downstream port, we're done */ + if (!(dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT)) + return connector_status_connected; + + /* If we're HPD-aware, SINK_COUNT changes dynamically */ + if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11 && + intel_dp->downstream_ports[0] & DP_DS_PORT_HPD) { + uint8_t reg; + + if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_SINK_COUNT, + ®, 1) < 0) + return connector_status_unknown; + + return DP_GET_SINK_COUNT(reg) ? connector_status_connected + : connector_status_disconnected; + } + + /* If no HPD, poke DDC gently */ + if (drm_probe_ddc(&intel_dp->aux.ddc)) + return connector_status_connected; + + /* Well we tried, say unknown for unreliable port types */ + if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11) { + type = intel_dp->downstream_ports[0] & DP_DS_PORT_TYPE_MASK; + if (type == DP_DS_PORT_TYPE_VGA || + type == DP_DS_PORT_TYPE_NON_EDID) + return connector_status_unknown; + } else { + type = intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] & + DP_DWN_STRM_PORT_TYPE_MASK; + if (type == DP_DWN_STRM_PORT_TYPE_ANALOG || + type == DP_DWN_STRM_PORT_TYPE_OTHER) + return connector_status_unknown; + } + + /* Anything else is out of spec, warn and ignore */ + DRM_DEBUG_KMS("Broken DP branch device, ignoring\n"); + return connector_status_disconnected; +} + +static enum drm_connector_status +edp_detect(struct intel_dp *intel_dp) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + enum drm_connector_status status; + + status = intel_panel_detect(dev); + if (status == connector_status_unknown) + status = connector_status_connected; + + return status; +} + +static enum drm_connector_status +ironlake_dp_detect(struct intel_dp *intel_dp) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + + if (!ibx_digital_port_connected(dev_priv, intel_dig_port)) + return connector_status_disconnected; + + return intel_dp_detect_dpcd(intel_dp); +} + +static int g4x_digital_port_connected(struct drm_device *dev, + struct intel_digital_port *intel_dig_port) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + uint32_t bit; + + if (IS_VALLEYVIEW(dev)) { + switch (intel_dig_port->port) { + case PORT_B: + bit = PORTB_HOTPLUG_LIVE_STATUS_VLV; + break; + case PORT_C: + bit = PORTC_HOTPLUG_LIVE_STATUS_VLV; + break; + case PORT_D: + bit = PORTD_HOTPLUG_LIVE_STATUS_VLV; + break; + default: + return -EINVAL; + } + } else { + switch (intel_dig_port->port) { + case PORT_B: + bit = PORTB_HOTPLUG_LIVE_STATUS_G4X; + break; + case PORT_C: + bit = PORTC_HOTPLUG_LIVE_STATUS_G4X; + break; + case PORT_D: + bit = PORTD_HOTPLUG_LIVE_STATUS_G4X; + break; + default: + return -EINVAL; + } + } + + if ((I915_READ(PORT_HOTPLUG_STAT) & bit) == 0) + return 0; + return 1; +} + +static enum drm_connector_status +g4x_dp_detect(struct intel_dp *intel_dp) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + int ret; + + /* Can't disconnect eDP, but you can close the lid... */ + if (is_edp(intel_dp)) { + enum drm_connector_status status; + + status = intel_panel_detect(dev); + if (status == connector_status_unknown) + status = connector_status_connected; + return status; + } + + ret = g4x_digital_port_connected(dev, intel_dig_port); + if (ret == -EINVAL) + return connector_status_unknown; + else if (ret == 0) + return connector_status_disconnected; + + return intel_dp_detect_dpcd(intel_dp); +} + +static struct edid * +intel_dp_get_edid(struct intel_dp *intel_dp) +{ + struct intel_connector *intel_connector = intel_dp->attached_connector; + + /* use cached edid if we have one */ + if (intel_connector->edid) { + /* invalid edid */ + if (IS_ERR(intel_connector->edid)) + return NULL; + + return drm_edid_duplicate(intel_connector->edid); + } else + return drm_get_edid(&intel_connector->base, + &intel_dp->aux.ddc); +} + +static void +intel_dp_set_edid(struct intel_dp *intel_dp) +{ + struct intel_connector *intel_connector = intel_dp->attached_connector; + struct edid *edid; + + edid = intel_dp_get_edid(intel_dp); + intel_connector->detect_edid = edid; + + if (intel_dp->force_audio != HDMI_AUDIO_AUTO) + intel_dp->has_audio = intel_dp->force_audio == HDMI_AUDIO_ON; + else + intel_dp->has_audio = drm_detect_monitor_audio(edid); +} + +static void +intel_dp_unset_edid(struct intel_dp *intel_dp) +{ + struct intel_connector *intel_connector = intel_dp->attached_connector; + + kfree(intel_connector->detect_edid); + intel_connector->detect_edid = NULL; + + intel_dp->has_audio = false; +} + +static enum intel_display_power_domain +intel_dp_power_get(struct intel_dp *dp) +{ + struct intel_encoder *encoder = &dp_to_dig_port(dp)->base; + enum intel_display_power_domain power_domain; + + power_domain = intel_display_port_power_domain(encoder); + intel_display_power_get(to_i915(encoder->base.dev), power_domain); + + return power_domain; +} + +static void +intel_dp_power_put(struct intel_dp *dp, + enum intel_display_power_domain power_domain) +{ + struct intel_encoder *encoder = &dp_to_dig_port(dp)->base; + intel_display_power_put(to_i915(encoder->base.dev), power_domain); +} + +static enum drm_connector_status +intel_dp_detect(struct drm_connector *connector, bool force) +{ + struct intel_dp *intel_dp = intel_attached_dp(connector); + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct intel_encoder *intel_encoder = &intel_dig_port->base; + struct drm_device *dev = connector->dev; + enum drm_connector_status status; + enum intel_display_power_domain power_domain; + bool ret; + + DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", + connector->base.id, connector->name); + intel_dp_unset_edid(intel_dp); + + if (intel_dp->is_mst) { + /* MST devices are disconnected from a monitor POV */ + if (intel_encoder->type != INTEL_OUTPUT_EDP) + intel_encoder->type = INTEL_OUTPUT_DISPLAYPORT; + return connector_status_disconnected; + } + + power_domain = intel_dp_power_get(intel_dp); + + /* Can't disconnect eDP, but you can close the lid... */ + if (is_edp(intel_dp)) + status = edp_detect(intel_dp); + else if (HAS_PCH_SPLIT(dev)) + status = ironlake_dp_detect(intel_dp); + else + status = g4x_dp_detect(intel_dp); + if (status != connector_status_connected) + goto out; + + intel_dp_probe_oui(intel_dp); + + ret = intel_dp_probe_mst(intel_dp); + if (ret) { + /* if we are in MST mode then this connector + won't appear connected or have anything with EDID on it */ + if (intel_encoder->type != INTEL_OUTPUT_EDP) + intel_encoder->type = INTEL_OUTPUT_DISPLAYPORT; + status = connector_status_disconnected; + goto out; + } + + intel_dp_set_edid(intel_dp); + + if (intel_encoder->type != INTEL_OUTPUT_EDP) + intel_encoder->type = INTEL_OUTPUT_DISPLAYPORT; + status = connector_status_connected; + +out: + intel_dp_power_put(intel_dp, power_domain); + return status; +} + +static void +intel_dp_force(struct drm_connector *connector) +{ + struct intel_dp *intel_dp = intel_attached_dp(connector); + struct intel_encoder *intel_encoder = &dp_to_dig_port(intel_dp)->base; + enum intel_display_power_domain power_domain; + + DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", + connector->base.id, connector->name); + intel_dp_unset_edid(intel_dp); + + if (connector->status != connector_status_connected) + return; + + power_domain = intel_dp_power_get(intel_dp); + + intel_dp_set_edid(intel_dp); + + intel_dp_power_put(intel_dp, power_domain); + + if (intel_encoder->type != INTEL_OUTPUT_EDP) + intel_encoder->type = INTEL_OUTPUT_DISPLAYPORT; +} + +static int intel_dp_get_modes(struct drm_connector *connector) +{ + struct intel_connector *intel_connector = to_intel_connector(connector); + struct edid *edid; + + edid = intel_connector->detect_edid; + if (edid) { + int ret = intel_connector_update_modes(connector, edid); + if (ret) + return ret; + } + + /* if eDP has no EDID, fall back to fixed mode */ + if (is_edp(intel_attached_dp(connector)) && + intel_connector->panel.fixed_mode) { + struct drm_display_mode *mode; + + mode = drm_mode_duplicate(connector->dev, + intel_connector->panel.fixed_mode); + if (mode) { + drm_mode_probed_add(connector, mode); + return 1; + } + } + + return 0; +} + +static bool +intel_dp_detect_audio(struct drm_connector *connector) +{ + bool has_audio = false; + struct edid *edid; + + edid = to_intel_connector(connector)->detect_edid; + if (edid) + has_audio = drm_detect_monitor_audio(edid); + + return has_audio; +} + +static int +intel_dp_set_property(struct drm_connector *connector, + struct drm_property *property, + uint64_t val) +{ + struct drm_i915_private *dev_priv = connector->dev->dev_private; + struct intel_connector *intel_connector = to_intel_connector(connector); + struct intel_encoder *intel_encoder = intel_attached_encoder(connector); + struct intel_dp *intel_dp = enc_to_intel_dp(&intel_encoder->base); + int ret; + + ret = drm_object_property_set_value(&connector->base, property, val); + if (ret) + return ret; + + if (property == dev_priv->force_audio_property) { + int i = val; + bool has_audio; + + if (i == intel_dp->force_audio) + return 0; + + intel_dp->force_audio = i; + + if (i == HDMI_AUDIO_AUTO) + has_audio = intel_dp_detect_audio(connector); + else + has_audio = (i == HDMI_AUDIO_ON); + + if (has_audio == intel_dp->has_audio) + return 0; + + intel_dp->has_audio = has_audio; + goto done; + } + + if (property == dev_priv->broadcast_rgb_property) { + bool old_auto = intel_dp->color_range_auto; + uint32_t old_range = intel_dp->color_range; + + switch (val) { + case INTEL_BROADCAST_RGB_AUTO: + intel_dp->color_range_auto = true; + break; + case INTEL_BROADCAST_RGB_FULL: + intel_dp->color_range_auto = false; + intel_dp->color_range = 0; + break; + case INTEL_BROADCAST_RGB_LIMITED: + intel_dp->color_range_auto = false; + intel_dp->color_range = DP_COLOR_RANGE_16_235; + break; + default: + return -EINVAL; + } + + if (old_auto == intel_dp->color_range_auto && + old_range == intel_dp->color_range) + return 0; + + goto done; + } + + if (is_edp(intel_dp) && + property == connector->dev->mode_config.scaling_mode_property) { + if (val == DRM_MODE_SCALE_NONE) { + DRM_DEBUG_KMS("no scaling not supported\n"); + return -EINVAL; + } + + if (intel_connector->panel.fitting_mode == val) { + /* the eDP scaling property is not changed */ + return 0; + } + intel_connector->panel.fitting_mode = val; + + goto done; + } + + return -EINVAL; + +done: + if (intel_encoder->base.crtc) + intel_crtc_restore_mode(intel_encoder->base.crtc); + + return 0; +} + +static void +intel_dp_connector_destroy(struct drm_connector *connector) +{ + struct intel_connector *intel_connector = to_intel_connector(connector); + + kfree(intel_connector->detect_edid); + + if (!IS_ERR_OR_NULL(intel_connector->edid)) + kfree(intel_connector->edid); + + /* Can't call is_edp() since the encoder may have been destroyed + * already. */ + if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) + intel_panel_fini(&intel_connector->panel); + + drm_connector_cleanup(connector); + kfree(connector); +} + +void intel_dp_encoder_destroy(struct drm_encoder *encoder) +{ + struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder); + struct intel_dp *intel_dp = &intel_dig_port->dp; + + drm_dp_aux_unregister(&intel_dp->aux); + intel_dp_mst_encoder_cleanup(intel_dig_port); + if (is_edp(intel_dp)) { + cancel_delayed_work_sync(&intel_dp->panel_vdd_work); + /* + * vdd might still be enabled do to the delayed vdd off. + * Make sure vdd is actually turned off here. + */ + pps_lock(intel_dp); + edp_panel_vdd_off_sync(intel_dp); + pps_unlock(intel_dp); + + if (intel_dp->edp_notifier.notifier_call) { + unregister_reboot_notifier(&intel_dp->edp_notifier); + intel_dp->edp_notifier.notifier_call = NULL; + } + } + drm_encoder_cleanup(encoder); + kfree(intel_dig_port); +} + +static void intel_dp_encoder_suspend(struct intel_encoder *intel_encoder) +{ + struct intel_dp *intel_dp = enc_to_intel_dp(&intel_encoder->base); + + if (!is_edp(intel_dp)) + return; + + /* + * vdd might still be enabled do to the delayed vdd off. + * Make sure vdd is actually turned off here. + */ + cancel_delayed_work_sync(&intel_dp->panel_vdd_work); + pps_lock(intel_dp); + edp_panel_vdd_off_sync(intel_dp); + pps_unlock(intel_dp); +} + +static void intel_edp_panel_vdd_sanitize(struct intel_dp *intel_dp) +{ + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct drm_device *dev = intel_dig_port->base.base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + enum intel_display_power_domain power_domain; + + lockdep_assert_held(&dev_priv->pps_mutex); + + if (!edp_have_panel_vdd(intel_dp)) + return; + + /* + * The VDD bit needs a power domain reference, so if the bit is + * already enabled when we boot or resume, grab this reference and + * schedule a vdd off, so we don't hold on to the reference + * indefinitely. + */ + DRM_DEBUG_KMS("VDD left on by BIOS, adjusting state tracking\n"); + power_domain = intel_display_port_power_domain(&intel_dig_port->base); + intel_display_power_get(dev_priv, power_domain); + + edp_panel_vdd_schedule_off(intel_dp); +} + +static void intel_dp_encoder_reset(struct drm_encoder *encoder) +{ + struct intel_dp *intel_dp; + + if (to_intel_encoder(encoder)->type != INTEL_OUTPUT_EDP) + return; + + intel_dp = enc_to_intel_dp(encoder); + + pps_lock(intel_dp); + + /* + * Read out the current power sequencer assignment, + * in case the BIOS did something with it. + */ + if (IS_VALLEYVIEW(encoder->dev)) + vlv_initial_power_sequencer_setup(intel_dp); + + intel_edp_panel_vdd_sanitize(intel_dp); + + pps_unlock(intel_dp); +} + +static const struct drm_connector_funcs intel_dp_connector_funcs = { + .dpms = intel_connector_dpms, + .detect = intel_dp_detect, + .force = intel_dp_force, + .fill_modes = drm_helper_probe_single_connector_modes, + .set_property = intel_dp_set_property, + .atomic_get_property = intel_connector_atomic_get_property, + .destroy = intel_dp_connector_destroy, + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, +}; + +static const struct drm_connector_helper_funcs intel_dp_connector_helper_funcs = { + .get_modes = intel_dp_get_modes, + .mode_valid = intel_dp_mode_valid, + .best_encoder = intel_best_encoder, +}; + +static const struct drm_encoder_funcs intel_dp_enc_funcs = { + .reset = intel_dp_encoder_reset, + .destroy = intel_dp_encoder_destroy, +}; + +void +intel_dp_hot_plug(struct intel_encoder *intel_encoder) +{ + return; +} + +enum irqreturn +intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd) +{ + struct intel_dp *intel_dp = &intel_dig_port->dp; + struct intel_encoder *intel_encoder = &intel_dig_port->base; + struct drm_device *dev = intel_dig_port->base.base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + enum intel_display_power_domain power_domain; + enum irqreturn ret = IRQ_NONE; + + if (intel_dig_port->base.type != INTEL_OUTPUT_EDP) + intel_dig_port->base.type = INTEL_OUTPUT_DISPLAYPORT; + + if (long_hpd && intel_dig_port->base.type == INTEL_OUTPUT_EDP) { + /* + * vdd off can generate a long pulse on eDP which + * would require vdd on to handle it, and thus we + * would end up in an endless cycle of + * "vdd off -> long hpd -> vdd on -> detect -> vdd off -> ..." + */ + DRM_DEBUG_KMS("ignoring long hpd on eDP port %c\n", + port_name(intel_dig_port->port)); + return IRQ_HANDLED; + } + + DRM_DEBUG_KMS("got hpd irq on port %c - %s\n", + port_name(intel_dig_port->port), + long_hpd ? "long" : "short"); + + power_domain = intel_display_port_power_domain(intel_encoder); + intel_display_power_get(dev_priv, power_domain); + + if (long_hpd) { + + if (HAS_PCH_SPLIT(dev)) { + if (!ibx_digital_port_connected(dev_priv, intel_dig_port)) + goto mst_fail; + } else { + if (g4x_digital_port_connected(dev, intel_dig_port) != 1) + goto mst_fail; + } + + if (!intel_dp_get_dpcd(intel_dp)) { + goto mst_fail; + } + + intel_dp_probe_oui(intel_dp); + + if (!intel_dp_probe_mst(intel_dp)) + goto mst_fail; + + } else { + if (intel_dp->is_mst) { + if (intel_dp_check_mst_status(intel_dp) == -EINVAL) + goto mst_fail; + } + + if (!intel_dp->is_mst) { + /* + * we'll check the link status via the normal hot plug path later - + * but for short hpds we should check it now + */ + drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); + intel_dp_check_link_status(intel_dp); + drm_modeset_unlock(&dev->mode_config.connection_mutex); + } + } + + ret = IRQ_HANDLED; + + goto put_power; +mst_fail: + /* if we were in MST mode, and device is not there get out of MST mode */ + if (intel_dp->is_mst) { + DRM_DEBUG_KMS("MST device may have disappeared %d vs %d\n", intel_dp->is_mst, intel_dp->mst_mgr.mst_state); + intel_dp->is_mst = false; + drm_dp_mst_topology_mgr_set_mst(&intel_dp->mst_mgr, intel_dp->is_mst); + } +put_power: + intel_display_power_put(dev_priv, power_domain); + + return ret; +} + +/* Return which DP Port should be selected for Transcoder DP control */ +int +intel_trans_dp_port_sel(struct drm_crtc *crtc) +{ + struct drm_device *dev = crtc->dev; + struct intel_encoder *intel_encoder; + struct intel_dp *intel_dp; + + for_each_encoder_on_crtc(dev, crtc, intel_encoder) { + intel_dp = enc_to_intel_dp(&intel_encoder->base); + + if (intel_encoder->type == INTEL_OUTPUT_DISPLAYPORT || + intel_encoder->type == INTEL_OUTPUT_EDP) + return intel_dp->output_reg; + } + + return -1; +} + +/* check the VBT to see whether the eDP is on DP-D port */ +bool intel_dp_is_edp(struct drm_device *dev, enum port port) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + union child_device_config *p_child; + int i; + static const short port_mapping[] = { + [PORT_B] = PORT_IDPB, + [PORT_C] = PORT_IDPC, + [PORT_D] = PORT_IDPD, + }; + + if (port == PORT_A) + return true; + + if (!dev_priv->vbt.child_dev_num) + return false; + + for (i = 0; i < dev_priv->vbt.child_dev_num; i++) { + p_child = dev_priv->vbt.child_dev + i; + + if (p_child->common.dvo_port == port_mapping[port] && + (p_child->common.device_type & DEVICE_TYPE_eDP_BITS) == + (DEVICE_TYPE_eDP & DEVICE_TYPE_eDP_BITS)) + return true; + } + return false; +} + +void +intel_dp_add_properties(struct intel_dp *intel_dp, struct drm_connector *connector) +{ + struct intel_connector *intel_connector = to_intel_connector(connector); + + intel_attach_force_audio_property(connector); + intel_attach_broadcast_rgb_property(connector); + intel_dp->color_range_auto = true; + + if (is_edp(intel_dp)) { + drm_mode_create_scaling_mode_property(connector->dev); + drm_object_attach_property( + &connector->base, + connector->dev->mode_config.scaling_mode_property, + DRM_MODE_SCALE_ASPECT); + intel_connector->panel.fitting_mode = DRM_MODE_SCALE_ASPECT; + } +} + +static void intel_dp_init_panel_power_timestamps(struct intel_dp *intel_dp) +{ + intel_dp->last_power_cycle = jiffies; + intel_dp->last_power_on = jiffies; + intel_dp->last_backlight_off = jiffies; +} + +static void +intel_dp_init_panel_power_sequencer(struct drm_device *dev, + struct intel_dp *intel_dp) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + struct edp_power_seq cur, vbt, spec, + *final = &intel_dp->pps_delays; + u32 pp_on, pp_off, pp_div, pp; + int pp_ctrl_reg, pp_on_reg, pp_off_reg, pp_div_reg; + + lockdep_assert_held(&dev_priv->pps_mutex); + + /* already initialized? */ + if (final->t11_t12 != 0) + return; + + if (HAS_PCH_SPLIT(dev)) { + pp_ctrl_reg = PCH_PP_CONTROL; + pp_on_reg = PCH_PP_ON_DELAYS; + pp_off_reg = PCH_PP_OFF_DELAYS; + pp_div_reg = PCH_PP_DIVISOR; + } else { + enum pipe pipe = vlv_power_sequencer_pipe(intel_dp); + + pp_ctrl_reg = VLV_PIPE_PP_CONTROL(pipe); + pp_on_reg = VLV_PIPE_PP_ON_DELAYS(pipe); + pp_off_reg = VLV_PIPE_PP_OFF_DELAYS(pipe); + pp_div_reg = VLV_PIPE_PP_DIVISOR(pipe); + } + + /* Workaround: Need to write PP_CONTROL with the unlock key as + * the very first thing. */ + pp = ironlake_get_pp_control(intel_dp); + I915_WRITE(pp_ctrl_reg, pp); + + pp_on = I915_READ(pp_on_reg); + pp_off = I915_READ(pp_off_reg); + pp_div = I915_READ(pp_div_reg); + + /* Pull timing values out of registers */ + cur.t1_t3 = (pp_on & PANEL_POWER_UP_DELAY_MASK) >> + PANEL_POWER_UP_DELAY_SHIFT; + + cur.t8 = (pp_on & PANEL_LIGHT_ON_DELAY_MASK) >> + PANEL_LIGHT_ON_DELAY_SHIFT; + + cur.t9 = (pp_off & PANEL_LIGHT_OFF_DELAY_MASK) >> + PANEL_LIGHT_OFF_DELAY_SHIFT; + + cur.t10 = (pp_off & PANEL_POWER_DOWN_DELAY_MASK) >> + PANEL_POWER_DOWN_DELAY_SHIFT; + + cur.t11_t12 = ((pp_div & PANEL_POWER_CYCLE_DELAY_MASK) >> + PANEL_POWER_CYCLE_DELAY_SHIFT) * 1000; + + DRM_DEBUG_KMS("cur t1_t3 %d t8 %d t9 %d t10 %d t11_t12 %d\n", + cur.t1_t3, cur.t8, cur.t9, cur.t10, cur.t11_t12); + + vbt = dev_priv->vbt.edp_pps; + + /* Upper limits from eDP 1.3 spec. Note that we use the clunky units of + * our hw here, which are all in 100usec. */ + spec.t1_t3 = 210 * 10; + spec.t8 = 50 * 10; /* no limit for t8, use t7 instead */ + spec.t9 = 50 * 10; /* no limit for t9, make it symmetric with t8 */ + spec.t10 = 500 * 10; + /* This one is special and actually in units of 100ms, but zero + * based in the hw (so we need to add 100 ms). But the sw vbt + * table multiplies it with 1000 to make it in units of 100usec, + * too. */ + spec.t11_t12 = (510 + 100) * 10; + + DRM_DEBUG_KMS("vbt t1_t3 %d t8 %d t9 %d t10 %d t11_t12 %d\n", + vbt.t1_t3, vbt.t8, vbt.t9, vbt.t10, vbt.t11_t12); + + /* Use the max of the register settings and vbt. If both are + * unset, fall back to the spec limits. */ +#define assign_final(field) final->field = (max(cur.field, vbt.field) == 0 ? \ + spec.field : \ + max(cur.field, vbt.field)) + assign_final(t1_t3); + assign_final(t8); + assign_final(t9); + assign_final(t10); + assign_final(t11_t12); +#undef assign_final + +#define get_delay(field) (DIV_ROUND_UP(final->field, 10)) + intel_dp->panel_power_up_delay = get_delay(t1_t3); + intel_dp->backlight_on_delay = get_delay(t8); + intel_dp->backlight_off_delay = get_delay(t9); + intel_dp->panel_power_down_delay = get_delay(t10); + intel_dp->panel_power_cycle_delay = get_delay(t11_t12); +#undef get_delay + + DRM_DEBUG_KMS("panel power up delay %d, power down delay %d, power cycle delay %d\n", + intel_dp->panel_power_up_delay, intel_dp->panel_power_down_delay, + intel_dp->panel_power_cycle_delay); + + DRM_DEBUG_KMS("backlight on delay %d, off delay %d\n", + intel_dp->backlight_on_delay, intel_dp->backlight_off_delay); +} + +static void +intel_dp_init_panel_power_sequencer_registers(struct drm_device *dev, + struct intel_dp *intel_dp) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + u32 pp_on, pp_off, pp_div, port_sel = 0; + int div = HAS_PCH_SPLIT(dev) ? intel_pch_rawclk(dev) : intel_hrawclk(dev); + int pp_on_reg, pp_off_reg, pp_div_reg; + enum port port = dp_to_dig_port(intel_dp)->port; + const struct edp_power_seq *seq = &intel_dp->pps_delays; + + lockdep_assert_held(&dev_priv->pps_mutex); + + if (HAS_PCH_SPLIT(dev)) { + pp_on_reg = PCH_PP_ON_DELAYS; + pp_off_reg = PCH_PP_OFF_DELAYS; + pp_div_reg = PCH_PP_DIVISOR; + } else { + enum pipe pipe = vlv_power_sequencer_pipe(intel_dp); + + pp_on_reg = VLV_PIPE_PP_ON_DELAYS(pipe); + pp_off_reg = VLV_PIPE_PP_OFF_DELAYS(pipe); + pp_div_reg = VLV_PIPE_PP_DIVISOR(pipe); + } + + /* + * And finally store the new values in the power sequencer. The + * backlight delays are set to 1 because we do manual waits on them. For + * T8, even BSpec recommends doing it. For T9, if we don't do this, + * we'll end up waiting for the backlight off delay twice: once when we + * do the manual sleep, and once when we disable the panel and wait for + * the PP_STATUS bit to become zero. + */ + pp_on = (seq->t1_t3 << PANEL_POWER_UP_DELAY_SHIFT) | + (1 << PANEL_LIGHT_ON_DELAY_SHIFT); + pp_off = (1 << PANEL_LIGHT_OFF_DELAY_SHIFT) | + (seq->t10 << PANEL_POWER_DOWN_DELAY_SHIFT); + /* Compute the divisor for the pp clock, simply match the Bspec + * formula. */ + pp_div = ((100 * div)/2 - 1) << PP_REFERENCE_DIVIDER_SHIFT; + pp_div |= (DIV_ROUND_UP(seq->t11_t12, 1000) + << PANEL_POWER_CYCLE_DELAY_SHIFT); + + /* Haswell doesn't have any port selection bits for the panel + * power sequencer any more. */ + if (IS_VALLEYVIEW(dev)) { + port_sel = PANEL_PORT_SELECT_VLV(port); + } else if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev)) { + if (port == PORT_A) + port_sel = PANEL_PORT_SELECT_DPA; + else + port_sel = PANEL_PORT_SELECT_DPD; + } + + pp_on |= port_sel; + + I915_WRITE(pp_on_reg, pp_on); + I915_WRITE(pp_off_reg, pp_off); + I915_WRITE(pp_div_reg, pp_div); + + DRM_DEBUG_KMS("panel power sequencer register settings: PP_ON %#x, PP_OFF %#x, PP_DIV %#x\n", + I915_READ(pp_on_reg), + I915_READ(pp_off_reg), + I915_READ(pp_div_reg)); +} + +/** + * intel_dp_set_drrs_state - program registers for RR switch to take effect + * @dev: DRM device + * @refresh_rate: RR to be programmed + * + * This function gets called when refresh rate (RR) has to be changed from + * one frequency to another. Switches can be between high and low RR + * supported by the panel or to any other RR based on media playback (in + * this case, RR value needs to be passed from user space). + * + * The caller of this function needs to take a lock on dev_priv->drrs. + */ +static void intel_dp_set_drrs_state(struct drm_device *dev, int refresh_rate) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_encoder *encoder; + struct intel_digital_port *dig_port = NULL; + struct intel_dp *intel_dp = dev_priv->drrs.dp; + struct intel_crtc_state *config = NULL; + struct intel_crtc *intel_crtc = NULL; + u32 reg, val; + enum drrs_refresh_rate_type index = DRRS_HIGH_RR; + + if (refresh_rate <= 0) { + DRM_DEBUG_KMS("Refresh rate should be positive non-zero.\n"); + return; + } + + if (intel_dp == NULL) { + DRM_DEBUG_KMS("DRRS not supported.\n"); + return; + } + + /* + * FIXME: This needs proper synchronization with psr state for some + * platforms that cannot have PSR and DRRS enabled at the same time. + */ + + dig_port = dp_to_dig_port(intel_dp); + encoder = &dig_port->base; + intel_crtc = to_intel_crtc(encoder->base.crtc); + + if (!intel_crtc) { + DRM_DEBUG_KMS("DRRS: intel_crtc not initialized\n"); + return; + } + + config = intel_crtc->config; + + if (dev_priv->drrs.type < SEAMLESS_DRRS_SUPPORT) { + DRM_DEBUG_KMS("Only Seamless DRRS supported.\n"); + return; + } + + if (intel_dp->attached_connector->panel.downclock_mode->vrefresh == + refresh_rate) + index = DRRS_LOW_RR; + + if (index == dev_priv->drrs.refresh_rate_type) { + DRM_DEBUG_KMS( + "DRRS requested for previously set RR...ignoring\n"); + return; + } + + if (!intel_crtc->active) { + DRM_DEBUG_KMS("eDP encoder disabled. CRTC not Active\n"); + return; + } + + if (INTEL_INFO(dev)->gen >= 8 && !IS_CHERRYVIEW(dev)) { + switch (index) { + case DRRS_HIGH_RR: + intel_dp_set_m_n(intel_crtc, M1_N1); + break; + case DRRS_LOW_RR: + intel_dp_set_m_n(intel_crtc, M2_N2); + break; + case DRRS_MAX_RR: + default: + DRM_ERROR("Unsupported refreshrate type\n"); + } + } else if (INTEL_INFO(dev)->gen > 6) { + reg = PIPECONF(intel_crtc->config->cpu_transcoder); + val = I915_READ(reg); + + if (index > DRRS_HIGH_RR) { + if (IS_VALLEYVIEW(dev)) + val |= PIPECONF_EDP_RR_MODE_SWITCH_VLV; + else + val |= PIPECONF_EDP_RR_MODE_SWITCH; + } else { + if (IS_VALLEYVIEW(dev)) + val &= ~PIPECONF_EDP_RR_MODE_SWITCH_VLV; + else + val &= ~PIPECONF_EDP_RR_MODE_SWITCH; + } + I915_WRITE(reg, val); + } + + dev_priv->drrs.refresh_rate_type = index; + + DRM_DEBUG_KMS("eDP Refresh Rate set to : %dHz\n", refresh_rate); +} + +/** + * intel_edp_drrs_enable - init drrs struct if supported + * @intel_dp: DP struct + * + * Initializes frontbuffer_bits and drrs.dp + */ +void intel_edp_drrs_enable(struct intel_dp *intel_dp) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp); + struct drm_crtc *crtc = dig_port->base.base.crtc; + struct intel_crtc *intel_crtc = to_intel_crtc(crtc); + + if (!intel_crtc->config->has_drrs) { + DRM_DEBUG_KMS("Panel doesn't support DRRS\n"); + return; + } + + mutex_lock(&dev_priv->drrs.mutex); + if (WARN_ON(dev_priv->drrs.dp)) { + DRM_ERROR("DRRS already enabled\n"); + goto unlock; + } + + dev_priv->drrs.busy_frontbuffer_bits = 0; + + dev_priv->drrs.dp = intel_dp; + +unlock: + mutex_unlock(&dev_priv->drrs.mutex); +} + +/** + * intel_edp_drrs_disable - Disable DRRS + * @intel_dp: DP struct + * + */ +void intel_edp_drrs_disable(struct intel_dp *intel_dp) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp); + struct drm_crtc *crtc = dig_port->base.base.crtc; + struct intel_crtc *intel_crtc = to_intel_crtc(crtc); + + if (!intel_crtc->config->has_drrs) + return; + + mutex_lock(&dev_priv->drrs.mutex); + if (!dev_priv->drrs.dp) { + mutex_unlock(&dev_priv->drrs.mutex); + return; + } + + if (dev_priv->drrs.refresh_rate_type == DRRS_LOW_RR) + intel_dp_set_drrs_state(dev_priv->dev, + intel_dp->attached_connector->panel. + fixed_mode->vrefresh); + + dev_priv->drrs.dp = NULL; + mutex_unlock(&dev_priv->drrs.mutex); + + cancel_delayed_work_sync(&dev_priv->drrs.work); +} + +static void intel_edp_drrs_downclock_work(struct work_struct *work) +{ + struct drm_i915_private *dev_priv = + container_of(work, typeof(*dev_priv), drrs.work.work); + struct intel_dp *intel_dp; + + mutex_lock(&dev_priv->drrs.mutex); + + intel_dp = dev_priv->drrs.dp; + + if (!intel_dp) + goto unlock; + + /* + * The delayed work can race with an invalidate hence we need to + * recheck. + */ + + if (dev_priv->drrs.busy_frontbuffer_bits) + goto unlock; + + if (dev_priv->drrs.refresh_rate_type != DRRS_LOW_RR) + intel_dp_set_drrs_state(dev_priv->dev, + intel_dp->attached_connector->panel. + downclock_mode->vrefresh); + +unlock: + mutex_unlock(&dev_priv->drrs.mutex); +} + +/** + * intel_edp_drrs_invalidate - Invalidate DRRS + * @dev: DRM device + * @frontbuffer_bits: frontbuffer plane tracking bits + * + * When there is a disturbance on screen (due to cursor movement/time + * update etc), DRRS needs to be invalidated, i.e. need to switch to + * high RR. + * + * Dirty frontbuffers relevant to DRRS are tracked in busy_frontbuffer_bits. + */ +void intel_edp_drrs_invalidate(struct drm_device *dev, + unsigned frontbuffer_bits) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + struct drm_crtc *crtc; + enum pipe pipe; + + if (dev_priv->drrs.type == DRRS_NOT_SUPPORTED) + return; + + cancel_delayed_work(&dev_priv->drrs.work); + + mutex_lock(&dev_priv->drrs.mutex); + if (!dev_priv->drrs.dp) { + mutex_unlock(&dev_priv->drrs.mutex); + return; + } + + crtc = dp_to_dig_port(dev_priv->drrs.dp)->base.base.crtc; + pipe = to_intel_crtc(crtc)->pipe; + + if (dev_priv->drrs.refresh_rate_type == DRRS_LOW_RR) { + intel_dp_set_drrs_state(dev_priv->dev, + dev_priv->drrs.dp->attached_connector->panel. + fixed_mode->vrefresh); + } + + frontbuffer_bits &= INTEL_FRONTBUFFER_ALL_MASK(pipe); + + dev_priv->drrs.busy_frontbuffer_bits |= frontbuffer_bits; + mutex_unlock(&dev_priv->drrs.mutex); +} + +/** + * intel_edp_drrs_flush - Flush DRRS + * @dev: DRM device + * @frontbuffer_bits: frontbuffer plane tracking bits + * + * When there is no movement on screen, DRRS work can be scheduled. + * This DRRS work is responsible for setting relevant registers after a + * timeout of 1 second. + * + * Dirty frontbuffers relevant to DRRS are tracked in busy_frontbuffer_bits. + */ +void intel_edp_drrs_flush(struct drm_device *dev, + unsigned frontbuffer_bits) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + struct drm_crtc *crtc; + enum pipe pipe; + + if (dev_priv->drrs.type == DRRS_NOT_SUPPORTED) + return; + + cancel_delayed_work(&dev_priv->drrs.work); + + mutex_lock(&dev_priv->drrs.mutex); + if (!dev_priv->drrs.dp) { + mutex_unlock(&dev_priv->drrs.mutex); + return; + } + + crtc = dp_to_dig_port(dev_priv->drrs.dp)->base.base.crtc; + pipe = to_intel_crtc(crtc)->pipe; + dev_priv->drrs.busy_frontbuffer_bits &= ~frontbuffer_bits; + + if (dev_priv->drrs.refresh_rate_type != DRRS_LOW_RR && + !dev_priv->drrs.busy_frontbuffer_bits) + schedule_delayed_work(&dev_priv->drrs.work, + msecs_to_jiffies(1000)); + mutex_unlock(&dev_priv->drrs.mutex); +} + +/** + * DOC: Display Refresh Rate Switching (DRRS) + * + * Display Refresh Rate Switching (DRRS) is a power conservation feature + * which enables swtching between low and high refresh rates, + * dynamically, based on the usage scenario. This feature is applicable + * for internal panels. + * + * Indication that the panel supports DRRS is given by the panel EDID, which + * would list multiple refresh rates for one resolution. + * + * DRRS is of 2 types - static and seamless. + * Static DRRS involves changing refresh rate (RR) by doing a full modeset + * (may appear as a blink on screen) and is used in dock-undock scenario. + * Seamless DRRS involves changing RR without any visual effect to the user + * and can be used during normal system usage. This is done by programming + * certain registers. + * + * Support for static/seamless DRRS may be indicated in the VBT based on + * inputs from the panel spec. + * + * DRRS saves power by switching to low RR based on usage scenarios. + * + * eDP DRRS:- + * The implementation is based on frontbuffer tracking implementation. + * When there is a disturbance on the screen triggered by user activity or a + * periodic system activity, DRRS is disabled (RR is changed to high RR). + * When there is no movement on screen, after a timeout of 1 second, a switch + * to low RR is made. + * For integration with frontbuffer tracking code, + * intel_edp_drrs_invalidate() and intel_edp_drrs_flush() are called. + * + * DRRS can be further extended to support other internal panels and also + * the scenario of video playback wherein RR is set based on the rate + * requested by userspace. + */ + +/** + * intel_dp_drrs_init - Init basic DRRS work and mutex. + * @intel_connector: eDP connector + * @fixed_mode: preferred mode of panel + * + * This function is called only once at driver load to initialize basic + * DRRS stuff. + * + * Returns: + * Downclock mode if panel supports it, else return NULL. + * DRRS support is determined by the presence of downclock mode (apart + * from VBT setting). + */ +static struct drm_display_mode * +intel_dp_drrs_init(struct intel_connector *intel_connector, + struct drm_display_mode *fixed_mode) +{ + struct drm_connector *connector = &intel_connector->base; + struct drm_device *dev = connector->dev; + struct drm_i915_private *dev_priv = dev->dev_private; + struct drm_display_mode *downclock_mode = NULL; + + INIT_DELAYED_WORK(&dev_priv->drrs.work, intel_edp_drrs_downclock_work); + mutex_init(&dev_priv->drrs.mutex); + + if (INTEL_INFO(dev)->gen <= 6) { + DRM_DEBUG_KMS("DRRS supported for Gen7 and above\n"); + return NULL; + } + + if (dev_priv->vbt.drrs_type != SEAMLESS_DRRS_SUPPORT) { + DRM_DEBUG_KMS("VBT doesn't support DRRS\n"); + return NULL; + } + + downclock_mode = intel_find_panel_downclock + (dev, fixed_mode, connector); + + if (!downclock_mode) { + DRM_DEBUG_KMS("Downclock mode is not found. DRRS not supported\n"); + return NULL; + } + + dev_priv->drrs.type = dev_priv->vbt.drrs_type; + + dev_priv->drrs.refresh_rate_type = DRRS_HIGH_RR; + DRM_DEBUG_KMS("seamless DRRS supported for eDP panel.\n"); + return downclock_mode; +} + +static bool intel_edp_init_connector(struct intel_dp *intel_dp, + struct intel_connector *intel_connector) +{ + struct drm_connector *connector = &intel_connector->base; + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); + struct intel_encoder *intel_encoder = &intel_dig_port->base; + struct drm_device *dev = intel_encoder->base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + struct drm_display_mode *fixed_mode = NULL; + struct drm_display_mode *downclock_mode = NULL; + bool has_dpcd; + struct drm_display_mode *scan; + struct edid *edid; + enum pipe pipe = INVALID_PIPE; + + if (!is_edp(intel_dp)) + return true; + + pps_lock(intel_dp); + intel_edp_panel_vdd_sanitize(intel_dp); + pps_unlock(intel_dp); + + /* Cache DPCD and EDID for edp. */ + has_dpcd = intel_dp_get_dpcd(intel_dp); + + if (has_dpcd) { + if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11) + dev_priv->no_aux_handshake = + intel_dp->dpcd[DP_MAX_DOWNSPREAD] & + DP_NO_AUX_HANDSHAKE_LINK_TRAINING; + } else { + /* if this fails, presume the device is a ghost */ + DRM_INFO("failed to retrieve link info, disabling eDP\n"); + return false; + } + + /* We now know it's not a ghost, init power sequence regs. */ + pps_lock(intel_dp); + intel_dp_init_panel_power_sequencer_registers(dev, intel_dp); + pps_unlock(intel_dp); + + mutex_lock(&dev->mode_config.mutex); + edid = drm_get_edid(connector, &intel_dp->aux.ddc); + if (edid) { + if (drm_add_edid_modes(connector, edid)) { + drm_mode_connector_update_edid_property(connector, + edid); + drm_edid_to_eld(connector, edid); + } else { + kfree(edid); + edid = ERR_PTR(-EINVAL); + } + } else { + edid = ERR_PTR(-ENOENT); + } + intel_connector->edid = edid; + + /* prefer fixed mode from EDID if available */ + list_for_each_entry(scan, &connector->probed_modes, head) { + if ((scan->type & DRM_MODE_TYPE_PREFERRED)) { + fixed_mode = drm_mode_duplicate(dev, scan); + downclock_mode = intel_dp_drrs_init( + intel_connector, fixed_mode); + break; + } + } + + /* fallback to VBT if available for eDP */ + if (!fixed_mode && dev_priv->vbt.lfp_lvds_vbt_mode) { + fixed_mode = drm_mode_duplicate(dev, + dev_priv->vbt.lfp_lvds_vbt_mode); + if (fixed_mode) + fixed_mode->type |= DRM_MODE_TYPE_PREFERRED; + } + mutex_unlock(&dev->mode_config.mutex); + + if (IS_VALLEYVIEW(dev)) { + intel_dp->edp_notifier.notifier_call = edp_notify_handler; + register_reboot_notifier(&intel_dp->edp_notifier); + + /* + * Figure out the current pipe for the initial backlight setup. + * If the current pipe isn't valid, try the PPS pipe, and if that + * fails just assume pipe A. + */ + if (IS_CHERRYVIEW(dev)) + pipe = DP_PORT_TO_PIPE_CHV(intel_dp->DP); + else + pipe = PORT_TO_PIPE(intel_dp->DP); + + if (pipe != PIPE_A && pipe != PIPE_B) + pipe = intel_dp->pps_pipe; + + if (pipe != PIPE_A && pipe != PIPE_B) + pipe = PIPE_A; + + DRM_DEBUG_KMS("using pipe %c for initial backlight setup\n", + pipe_name(pipe)); + } + + intel_panel_init(&intel_connector->panel, fixed_mode, downclock_mode); + intel_connector->panel.backlight_power = intel_edp_backlight_power; + intel_panel_setup_backlight(connector, pipe); + + return true; +} + +bool +intel_dp_init_connector(struct intel_digital_port *intel_dig_port, + struct intel_connector *intel_connector) +{ + struct drm_connector *connector = &intel_connector->base; + struct intel_dp *intel_dp = &intel_dig_port->dp; + struct intel_encoder *intel_encoder = &intel_dig_port->base; + struct drm_device *dev = intel_encoder->base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + enum port port = intel_dig_port->port; + int type; + + intel_dp->pps_pipe = INVALID_PIPE; + + /* intel_dp vfuncs */ + if (INTEL_INFO(dev)->gen >= 9) + intel_dp->get_aux_clock_divider = skl_get_aux_clock_divider; + else if (IS_VALLEYVIEW(dev)) + intel_dp->get_aux_clock_divider = vlv_get_aux_clock_divider; + else if (IS_HASWELL(dev) || IS_BROADWELL(dev)) + intel_dp->get_aux_clock_divider = hsw_get_aux_clock_divider; + else if (HAS_PCH_SPLIT(dev)) + intel_dp->get_aux_clock_divider = ilk_get_aux_clock_divider; + else + intel_dp->get_aux_clock_divider = i9xx_get_aux_clock_divider; + + if (INTEL_INFO(dev)->gen >= 9) + intel_dp->get_aux_send_ctl = skl_get_aux_send_ctl; + else + intel_dp->get_aux_send_ctl = i9xx_get_aux_send_ctl; + + /* Preserve the current hw state. */ + intel_dp->DP = I915_READ(intel_dp->output_reg); + intel_dp->attached_connector = intel_connector; + + if (intel_dp_is_edp(dev, port)) + type = DRM_MODE_CONNECTOR_eDP; + else + type = DRM_MODE_CONNECTOR_DisplayPort; + + /* + * For eDP we always set the encoder type to INTEL_OUTPUT_EDP, but + * for DP the encoder type can be set by the caller to + * INTEL_OUTPUT_UNKNOWN for DDI, so don't rewrite it. + */ + if (type == DRM_MODE_CONNECTOR_eDP) + intel_encoder->type = INTEL_OUTPUT_EDP; + + /* eDP only on port B and/or C on vlv/chv */ + if (WARN_ON(IS_VALLEYVIEW(dev) && is_edp(intel_dp) && + port != PORT_B && port != PORT_C)) + return false; + + DRM_DEBUG_KMS("Adding %s connector on port %c\n", + type == DRM_MODE_CONNECTOR_eDP ? "eDP" : "DP", + port_name(port)); + + drm_connector_init(dev, connector, &intel_dp_connector_funcs, type); + drm_connector_helper_add(connector, &intel_dp_connector_helper_funcs); + + connector->interlace_allowed = true; + connector->doublescan_allowed = 0; + + INIT_DELAYED_WORK(&intel_dp->panel_vdd_work, + edp_panel_vdd_work); + + intel_connector_attach_encoder(intel_connector, intel_encoder); + drm_connector_register(connector); + + if (HAS_DDI(dev)) + intel_connector->get_hw_state = intel_ddi_connector_get_hw_state; + else + intel_connector->get_hw_state = intel_connector_get_hw_state; + intel_connector->unregister = intel_dp_connector_unregister; + + /* Set up the hotplug pin. */ + switch (port) { + case PORT_A: + intel_encoder->hpd_pin = HPD_PORT_A; + break; + case PORT_B: + intel_encoder->hpd_pin = HPD_PORT_B; + break; + case PORT_C: + intel_encoder->hpd_pin = HPD_PORT_C; + break; + case PORT_D: + intel_encoder->hpd_pin = HPD_PORT_D; + break; + default: + BUG(); + } + + if (is_edp(intel_dp)) { + pps_lock(intel_dp); + intel_dp_init_panel_power_timestamps(intel_dp); + if (IS_VALLEYVIEW(dev)) + vlv_initial_power_sequencer_setup(intel_dp); + else + intel_dp_init_panel_power_sequencer(dev, intel_dp); + pps_unlock(intel_dp); + } + + intel_dp_aux_init(intel_dp, intel_connector); + + /* init MST on ports that can support it */ + if (IS_HASWELL(dev) || IS_BROADWELL(dev) || INTEL_INFO(dev)->gen >= 9) { + if (port == PORT_B || port == PORT_C || port == PORT_D) { + intel_dp_mst_encoder_init(intel_dig_port, + intel_connector->base.base.id); + } + } + + if (!intel_edp_init_connector(intel_dp, intel_connector)) { + drm_dp_aux_unregister(&intel_dp->aux); + if (is_edp(intel_dp)) { + cancel_delayed_work_sync(&intel_dp->panel_vdd_work); + /* + * vdd might still be enabled do to the delayed vdd off. + * Make sure vdd is actually turned off here. + */ + pps_lock(intel_dp); + edp_panel_vdd_off_sync(intel_dp); + pps_unlock(intel_dp); + } + drm_connector_unregister(connector); + drm_connector_cleanup(connector); + return false; + } + + intel_dp_add_properties(intel_dp, connector); + + /* For G4X desktop chip, PEG_BAND_GAP_DATA 3:0 must first be written + * 0xd. Failure to do so will result in spurious interrupts being + * generated on the port when a cable is not attached. + */ + if (IS_G4X(dev) && !IS_GM45(dev)) { + u32 temp = I915_READ(PEG_BAND_GAP_DATA); + I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd); + } + + return true; +} + +void +intel_dp_init(struct drm_device *dev, int output_reg, enum port port) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_digital_port *intel_dig_port; + struct intel_encoder *intel_encoder; + struct drm_encoder *encoder; + struct intel_connector *intel_connector; + + intel_dig_port = kzalloc(sizeof(*intel_dig_port), GFP_KERNEL); + if (!intel_dig_port) + return; + + intel_connector = intel_connector_alloc(); + if (!intel_connector) { + kfree(intel_dig_port); + return; + } + + intel_encoder = &intel_dig_port->base; + encoder = &intel_encoder->base; + + drm_encoder_init(dev, &intel_encoder->base, &intel_dp_enc_funcs, + DRM_MODE_ENCODER_TMDS); + + intel_encoder->compute_config = intel_dp_compute_config; + intel_encoder->disable = intel_disable_dp; + intel_encoder->get_hw_state = intel_dp_get_hw_state; + intel_encoder->get_config = intel_dp_get_config; + intel_encoder->suspend = intel_dp_encoder_suspend; + if (IS_CHERRYVIEW(dev)) { + intel_encoder->pre_pll_enable = chv_dp_pre_pll_enable; + intel_encoder->pre_enable = chv_pre_enable_dp; + intel_encoder->enable = vlv_enable_dp; + intel_encoder->post_disable = chv_post_disable_dp; + } else if (IS_VALLEYVIEW(dev)) { + intel_encoder->pre_pll_enable = vlv_dp_pre_pll_enable; + intel_encoder->pre_enable = vlv_pre_enable_dp; + intel_encoder->enable = vlv_enable_dp; + intel_encoder->post_disable = vlv_post_disable_dp; + } else { + intel_encoder->pre_enable = g4x_pre_enable_dp; + intel_encoder->enable = g4x_enable_dp; + if (INTEL_INFO(dev)->gen >= 5) + intel_encoder->post_disable = ilk_post_disable_dp; + } + + intel_dig_port->port = port; + intel_dig_port->dp.output_reg = output_reg; + + intel_encoder->type = INTEL_OUTPUT_DISPLAYPORT; + if (IS_CHERRYVIEW(dev)) { + if (port == PORT_D) + intel_encoder->crtc_mask = 1 << 2; + else + intel_encoder->crtc_mask = (1 << 0) | (1 << 1); + } else { + intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2); + } + intel_encoder->cloneable = 0; + intel_encoder->hot_plug = intel_dp_hot_plug; + + intel_dig_port->hpd_pulse = intel_dp_hpd_pulse; + dev_priv->hpd_irq_port[port] = intel_dig_port; + + if (!intel_dp_init_connector(intel_dig_port, intel_connector)) { + drm_encoder_cleanup(encoder); + kfree(intel_dig_port); + kfree(intel_connector); + } +} + +void intel_dp_mst_suspend(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + int i; + + /* disable MST */ + for (i = 0; i < I915_MAX_PORTS; i++) { + struct intel_digital_port *intel_dig_port = dev_priv->hpd_irq_port[i]; + if (!intel_dig_port) + continue; + + if (intel_dig_port->base.type == INTEL_OUTPUT_DISPLAYPORT) { + if (!intel_dig_port->dp.can_mst) + continue; + if (intel_dig_port->dp.is_mst) + drm_dp_mst_topology_mgr_suspend(&intel_dig_port->dp.mst_mgr); + } + } +} + +void intel_dp_mst_resume(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + int i; + + for (i = 0; i < I915_MAX_PORTS; i++) { + struct intel_digital_port *intel_dig_port = dev_priv->hpd_irq_port[i]; + if (!intel_dig_port) + continue; + if (intel_dig_port->base.type == INTEL_OUTPUT_DISPLAYPORT) { + int ret; + + if (!intel_dig_port->dp.can_mst) + continue; + + ret = drm_dp_mst_topology_mgr_resume(&intel_dig_port->dp.mst_mgr); + if (ret != 0) { + intel_dp_check_mst_status(&intel_dig_port->dp); + } + } + } +} -- cgit v1.2.3