diff options
Diffstat (limited to 'drivers/gpu/drm/tegra/dsi.c')
| -rw-r--r-- | drivers/gpu/drm/tegra/dsi.c | 1636 |
1 files changed, 1636 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tegra/dsi.c b/drivers/gpu/drm/tegra/dsi.c new file mode 100644 index 000000000..ed970f622 --- /dev/null +++ b/drivers/gpu/drm/tegra/dsi.c @@ -0,0 +1,1636 @@ +/* + * Copyright (C) 2013 NVIDIA Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/clk.h> +#include <linux/debugfs.h> +#include <linux/host1x.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/reset.h> + +#include <linux/regulator/consumer.h> + +#include <drm/drm_atomic_helper.h> +#include <drm/drm_mipi_dsi.h> +#include <drm/drm_panel.h> + +#include <video/mipi_display.h> + +#include "dc.h" +#include "drm.h" +#include "dsi.h" +#include "mipi-phy.h" + +struct tegra_dsi_state { + struct drm_connector_state base; + + struct mipi_dphy_timing timing; + unsigned long period; + + unsigned int vrefresh; + unsigned int lanes; + unsigned long pclk; + unsigned long bclk; + + enum tegra_dsi_format format; + unsigned int mul; + unsigned int div; +}; + +static inline struct tegra_dsi_state * +to_dsi_state(struct drm_connector_state *state) +{ + return container_of(state, struct tegra_dsi_state, base); +} + +struct tegra_dsi { + struct host1x_client client; + struct tegra_output output; + struct device *dev; + + void __iomem *regs; + + struct reset_control *rst; + struct clk *clk_parent; + struct clk *clk_lp; + struct clk *clk; + + struct drm_info_list *debugfs_files; + struct drm_minor *minor; + struct dentry *debugfs; + + unsigned long flags; + enum mipi_dsi_pixel_format format; + unsigned int lanes; + + struct tegra_mipi_device *mipi; + struct mipi_dsi_host host; + + struct regulator *vdd; + + unsigned int video_fifo_depth; + unsigned int host_fifo_depth; + + /* for ganged-mode support */ + struct tegra_dsi *master; + struct tegra_dsi *slave; +}; + +static inline struct tegra_dsi * +host1x_client_to_dsi(struct host1x_client *client) +{ + return container_of(client, struct tegra_dsi, client); +} + +static inline struct tegra_dsi *host_to_tegra(struct mipi_dsi_host *host) +{ + return container_of(host, struct tegra_dsi, host); +} + +static inline struct tegra_dsi *to_dsi(struct tegra_output *output) +{ + return container_of(output, struct tegra_dsi, output); +} + +static struct tegra_dsi_state *tegra_dsi_get_state(struct tegra_dsi *dsi) +{ + return to_dsi_state(dsi->output.connector.state); +} + +static inline u32 tegra_dsi_readl(struct tegra_dsi *dsi, unsigned long reg) +{ + return readl(dsi->regs + (reg << 2)); +} + +static inline void tegra_dsi_writel(struct tegra_dsi *dsi, u32 value, + unsigned long reg) +{ + writel(value, dsi->regs + (reg << 2)); +} + +static int tegra_dsi_show_regs(struct seq_file *s, void *data) +{ + struct drm_info_node *node = s->private; + struct tegra_dsi *dsi = node->info_ent->data; + +#define DUMP_REG(name) \ + seq_printf(s, "%-32s %#05x %08x\n", #name, name, \ + tegra_dsi_readl(dsi, name)) + + DUMP_REG(DSI_INCR_SYNCPT); + DUMP_REG(DSI_INCR_SYNCPT_CONTROL); + DUMP_REG(DSI_INCR_SYNCPT_ERROR); + DUMP_REG(DSI_CTXSW); + DUMP_REG(DSI_RD_DATA); + DUMP_REG(DSI_WR_DATA); + DUMP_REG(DSI_POWER_CONTROL); + DUMP_REG(DSI_INT_ENABLE); + DUMP_REG(DSI_INT_STATUS); + DUMP_REG(DSI_INT_MASK); + DUMP_REG(DSI_HOST_CONTROL); + DUMP_REG(DSI_CONTROL); + DUMP_REG(DSI_SOL_DELAY); + DUMP_REG(DSI_MAX_THRESHOLD); + DUMP_REG(DSI_TRIGGER); + DUMP_REG(DSI_TX_CRC); + DUMP_REG(DSI_STATUS); + + DUMP_REG(DSI_INIT_SEQ_CONTROL); + DUMP_REG(DSI_INIT_SEQ_DATA_0); + DUMP_REG(DSI_INIT_SEQ_DATA_1); + DUMP_REG(DSI_INIT_SEQ_DATA_2); + DUMP_REG(DSI_INIT_SEQ_DATA_3); + DUMP_REG(DSI_INIT_SEQ_DATA_4); + DUMP_REG(DSI_INIT_SEQ_DATA_5); + DUMP_REG(DSI_INIT_SEQ_DATA_6); + DUMP_REG(DSI_INIT_SEQ_DATA_7); + + DUMP_REG(DSI_PKT_SEQ_0_LO); + DUMP_REG(DSI_PKT_SEQ_0_HI); + DUMP_REG(DSI_PKT_SEQ_1_LO); + DUMP_REG(DSI_PKT_SEQ_1_HI); + DUMP_REG(DSI_PKT_SEQ_2_LO); + DUMP_REG(DSI_PKT_SEQ_2_HI); + DUMP_REG(DSI_PKT_SEQ_3_LO); + DUMP_REG(DSI_PKT_SEQ_3_HI); + DUMP_REG(DSI_PKT_SEQ_4_LO); + DUMP_REG(DSI_PKT_SEQ_4_HI); + DUMP_REG(DSI_PKT_SEQ_5_LO); + DUMP_REG(DSI_PKT_SEQ_5_HI); + + DUMP_REG(DSI_DCS_CMDS); + + DUMP_REG(DSI_PKT_LEN_0_1); + DUMP_REG(DSI_PKT_LEN_2_3); + DUMP_REG(DSI_PKT_LEN_4_5); + DUMP_REG(DSI_PKT_LEN_6_7); + + DUMP_REG(DSI_PHY_TIMING_0); + DUMP_REG(DSI_PHY_TIMING_1); + DUMP_REG(DSI_PHY_TIMING_2); + DUMP_REG(DSI_BTA_TIMING); + + DUMP_REG(DSI_TIMEOUT_0); + DUMP_REG(DSI_TIMEOUT_1); + DUMP_REG(DSI_TO_TALLY); + + DUMP_REG(DSI_PAD_CONTROL_0); + DUMP_REG(DSI_PAD_CONTROL_CD); + DUMP_REG(DSI_PAD_CD_STATUS); + DUMP_REG(DSI_VIDEO_MODE_CONTROL); + DUMP_REG(DSI_PAD_CONTROL_1); + DUMP_REG(DSI_PAD_CONTROL_2); + DUMP_REG(DSI_PAD_CONTROL_3); + DUMP_REG(DSI_PAD_CONTROL_4); + + DUMP_REG(DSI_GANGED_MODE_CONTROL); + DUMP_REG(DSI_GANGED_MODE_START); + DUMP_REG(DSI_GANGED_MODE_SIZE); + + DUMP_REG(DSI_RAW_DATA_BYTE_COUNT); + DUMP_REG(DSI_ULTRA_LOW_POWER_CONTROL); + + DUMP_REG(DSI_INIT_SEQ_DATA_8); + DUMP_REG(DSI_INIT_SEQ_DATA_9); + DUMP_REG(DSI_INIT_SEQ_DATA_10); + DUMP_REG(DSI_INIT_SEQ_DATA_11); + DUMP_REG(DSI_INIT_SEQ_DATA_12); + DUMP_REG(DSI_INIT_SEQ_DATA_13); + DUMP_REG(DSI_INIT_SEQ_DATA_14); + DUMP_REG(DSI_INIT_SEQ_DATA_15); + +#undef DUMP_REG + + return 0; +} + +static struct drm_info_list debugfs_files[] = { + { "regs", tegra_dsi_show_regs, 0, NULL }, +}; + +static int tegra_dsi_debugfs_init(struct tegra_dsi *dsi, + struct drm_minor *minor) +{ + const char *name = dev_name(dsi->dev); + unsigned int i; + int err; + + dsi->debugfs = debugfs_create_dir(name, minor->debugfs_root); + if (!dsi->debugfs) + return -ENOMEM; + + dsi->debugfs_files = kmemdup(debugfs_files, sizeof(debugfs_files), + GFP_KERNEL); + if (!dsi->debugfs_files) { + err = -ENOMEM; + goto remove; + } + + for (i = 0; i < ARRAY_SIZE(debugfs_files); i++) + dsi->debugfs_files[i].data = dsi; + + err = drm_debugfs_create_files(dsi->debugfs_files, + ARRAY_SIZE(debugfs_files), + dsi->debugfs, minor); + if (err < 0) + goto free; + + dsi->minor = minor; + + return 0; + +free: + kfree(dsi->debugfs_files); + dsi->debugfs_files = NULL; +remove: + debugfs_remove(dsi->debugfs); + dsi->debugfs = NULL; + + return err; +} + +static void tegra_dsi_debugfs_exit(struct tegra_dsi *dsi) +{ + drm_debugfs_remove_files(dsi->debugfs_files, ARRAY_SIZE(debugfs_files), + dsi->minor); + dsi->minor = NULL; + + kfree(dsi->debugfs_files); + dsi->debugfs_files = NULL; + + debugfs_remove(dsi->debugfs); + dsi->debugfs = NULL; +} + +#define PKT_ID0(id) ((((id) & 0x3f) << 3) | (1 << 9)) +#define PKT_LEN0(len) (((len) & 0x07) << 0) +#define PKT_ID1(id) ((((id) & 0x3f) << 13) | (1 << 19)) +#define PKT_LEN1(len) (((len) & 0x07) << 10) +#define PKT_ID2(id) ((((id) & 0x3f) << 23) | (1 << 29)) +#define PKT_LEN2(len) (((len) & 0x07) << 20) + +#define PKT_LP (1 << 30) +#define NUM_PKT_SEQ 12 + +/* + * non-burst mode with sync pulses + */ +static const u32 pkt_seq_video_non_burst_sync_pulses[NUM_PKT_SEQ] = { + [ 0] = PKT_ID0(MIPI_DSI_V_SYNC_START) | PKT_LEN0(0) | + PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) | + PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) | + PKT_LP, + [ 1] = 0, + [ 2] = PKT_ID0(MIPI_DSI_V_SYNC_END) | PKT_LEN0(0) | + PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) | + PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) | + PKT_LP, + [ 3] = 0, + [ 4] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | + PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) | + PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) | + PKT_LP, + [ 5] = 0, + [ 6] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | + PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) | + PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0), + [ 7] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(2) | + PKT_ID1(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN1(3) | + PKT_ID2(MIPI_DSI_BLANKING_PACKET) | PKT_LEN2(4), + [ 8] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | + PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) | + PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) | + PKT_LP, + [ 9] = 0, + [10] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | + PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) | + PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0), + [11] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(2) | + PKT_ID1(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN1(3) | + PKT_ID2(MIPI_DSI_BLANKING_PACKET) | PKT_LEN2(4), +}; + +/* + * non-burst mode with sync events + */ +static const u32 pkt_seq_video_non_burst_sync_events[NUM_PKT_SEQ] = { + [ 0] = PKT_ID0(MIPI_DSI_V_SYNC_START) | PKT_LEN0(0) | + PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) | + PKT_LP, + [ 1] = 0, + [ 2] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | + PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) | + PKT_LP, + [ 3] = 0, + [ 4] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | + PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) | + PKT_LP, + [ 5] = 0, + [ 6] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | + PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(2) | + PKT_ID2(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN2(3), + [ 7] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(4), + [ 8] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | + PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) | + PKT_LP, + [ 9] = 0, + [10] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | + PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(2) | + PKT_ID2(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN2(3), + [11] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(4), +}; + +static const u32 pkt_seq_command_mode[NUM_PKT_SEQ] = { + [ 0] = 0, + [ 1] = 0, + [ 2] = 0, + [ 3] = 0, + [ 4] = 0, + [ 5] = 0, + [ 6] = PKT_ID0(MIPI_DSI_DCS_LONG_WRITE) | PKT_LEN0(3) | PKT_LP, + [ 7] = 0, + [ 8] = 0, + [ 9] = 0, + [10] = PKT_ID0(MIPI_DSI_DCS_LONG_WRITE) | PKT_LEN0(5) | PKT_LP, + [11] = 0, +}; + +static void tegra_dsi_set_phy_timing(struct tegra_dsi *dsi, + unsigned long period, + const struct mipi_dphy_timing *timing) +{ + u32 value; + + value = DSI_TIMING_FIELD(timing->hsexit, period, 1) << 24 | + DSI_TIMING_FIELD(timing->hstrail, period, 0) << 16 | + DSI_TIMING_FIELD(timing->hszero, period, 3) << 8 | + DSI_TIMING_FIELD(timing->hsprepare, period, 1); + tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_0); + + value = DSI_TIMING_FIELD(timing->clktrail, period, 1) << 24 | + DSI_TIMING_FIELD(timing->clkpost, period, 1) << 16 | + DSI_TIMING_FIELD(timing->clkzero, period, 1) << 8 | + DSI_TIMING_FIELD(timing->lpx, period, 1); + tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_1); + + value = DSI_TIMING_FIELD(timing->clkprepare, period, 1) << 16 | + DSI_TIMING_FIELD(timing->clkpre, period, 1) << 8 | + DSI_TIMING_FIELD(0xff * period, period, 0) << 0; + tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_2); + + value = DSI_TIMING_FIELD(timing->taget, period, 1) << 16 | + DSI_TIMING_FIELD(timing->tasure, period, 1) << 8 | + DSI_TIMING_FIELD(timing->tago, period, 1); + tegra_dsi_writel(dsi, value, DSI_BTA_TIMING); + + if (dsi->slave) + tegra_dsi_set_phy_timing(dsi->slave, period, timing); +} + +static int tegra_dsi_get_muldiv(enum mipi_dsi_pixel_format format, + unsigned int *mulp, unsigned int *divp) +{ + switch (format) { + case MIPI_DSI_FMT_RGB666_PACKED: + case MIPI_DSI_FMT_RGB888: + *mulp = 3; + *divp = 1; + break; + + case MIPI_DSI_FMT_RGB565: + *mulp = 2; + *divp = 1; + break; + + case MIPI_DSI_FMT_RGB666: + *mulp = 9; + *divp = 4; + break; + + default: + return -EINVAL; + } + + return 0; +} + +static int tegra_dsi_get_format(enum mipi_dsi_pixel_format format, + enum tegra_dsi_format *fmt) +{ + switch (format) { + case MIPI_DSI_FMT_RGB888: + *fmt = TEGRA_DSI_FORMAT_24P; + break; + + case MIPI_DSI_FMT_RGB666: + *fmt = TEGRA_DSI_FORMAT_18NP; + break; + + case MIPI_DSI_FMT_RGB666_PACKED: + *fmt = TEGRA_DSI_FORMAT_18P; + break; + + case MIPI_DSI_FMT_RGB565: + *fmt = TEGRA_DSI_FORMAT_16P; + break; + + default: + return -EINVAL; + } + + return 0; +} + +static void tegra_dsi_ganged_enable(struct tegra_dsi *dsi, unsigned int start, + unsigned int size) +{ + u32 value; + + tegra_dsi_writel(dsi, start, DSI_GANGED_MODE_START); + tegra_dsi_writel(dsi, size << 16 | size, DSI_GANGED_MODE_SIZE); + + value = DSI_GANGED_MODE_CONTROL_ENABLE; + tegra_dsi_writel(dsi, value, DSI_GANGED_MODE_CONTROL); +} + +static void tegra_dsi_enable(struct tegra_dsi *dsi) +{ + u32 value; + + value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL); + value |= DSI_POWER_CONTROL_ENABLE; + tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL); + + if (dsi->slave) + tegra_dsi_enable(dsi->slave); +} + +static unsigned int tegra_dsi_get_lanes(struct tegra_dsi *dsi) +{ + if (dsi->master) + return dsi->master->lanes + dsi->lanes; + + if (dsi->slave) + return dsi->lanes + dsi->slave->lanes; + + return dsi->lanes; +} + +static void tegra_dsi_configure(struct tegra_dsi *dsi, unsigned int pipe, + const struct drm_display_mode *mode) +{ + unsigned int hact, hsw, hbp, hfp, i, mul, div; + struct tegra_dsi_state *state; + const u32 *pkt_seq; + u32 value; + + /* XXX: pass in state into this function? */ + if (dsi->master) + state = tegra_dsi_get_state(dsi->master); + else + state = tegra_dsi_get_state(dsi); + + mul = state->mul; + div = state->div; + + if (dsi->flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) { + DRM_DEBUG_KMS("Non-burst video mode with sync pulses\n"); + pkt_seq = pkt_seq_video_non_burst_sync_pulses; + } else if (dsi->flags & MIPI_DSI_MODE_VIDEO) { + DRM_DEBUG_KMS("Non-burst video mode with sync events\n"); + pkt_seq = pkt_seq_video_non_burst_sync_events; + } else { + DRM_DEBUG_KMS("Command mode\n"); + pkt_seq = pkt_seq_command_mode; + } + + value = DSI_CONTROL_CHANNEL(0) | + DSI_CONTROL_FORMAT(state->format) | + DSI_CONTROL_LANES(dsi->lanes - 1) | + DSI_CONTROL_SOURCE(pipe); + tegra_dsi_writel(dsi, value, DSI_CONTROL); + + tegra_dsi_writel(dsi, dsi->video_fifo_depth, DSI_MAX_THRESHOLD); + + value = DSI_HOST_CONTROL_HS; + tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL); + + value = tegra_dsi_readl(dsi, DSI_CONTROL); + + if (dsi->flags & MIPI_DSI_CLOCK_NON_CONTINUOUS) + value |= DSI_CONTROL_HS_CLK_CTRL; + + value &= ~DSI_CONTROL_TX_TRIG(3); + + /* enable DCS commands for command mode */ + if (dsi->flags & MIPI_DSI_MODE_VIDEO) + value &= ~DSI_CONTROL_DCS_ENABLE; + else + value |= DSI_CONTROL_DCS_ENABLE; + + value |= DSI_CONTROL_VIDEO_ENABLE; + value &= ~DSI_CONTROL_HOST_ENABLE; + tegra_dsi_writel(dsi, value, DSI_CONTROL); + + for (i = 0; i < NUM_PKT_SEQ; i++) + tegra_dsi_writel(dsi, pkt_seq[i], DSI_PKT_SEQ_0_LO + i); + + if (dsi->flags & MIPI_DSI_MODE_VIDEO) { + /* horizontal active pixels */ + hact = mode->hdisplay * mul / div; + + /* horizontal sync width */ + hsw = (mode->hsync_end - mode->hsync_start) * mul / div; + hsw -= 10; + + /* horizontal back porch */ + hbp = (mode->htotal - mode->hsync_end) * mul / div; + hbp -= 14; + + /* horizontal front porch */ + hfp = (mode->hsync_start - mode->hdisplay) * mul / div; + hfp -= 8; + + tegra_dsi_writel(dsi, hsw << 16 | 0, DSI_PKT_LEN_0_1); + tegra_dsi_writel(dsi, hact << 16 | hbp, DSI_PKT_LEN_2_3); + tegra_dsi_writel(dsi, hfp, DSI_PKT_LEN_4_5); + tegra_dsi_writel(dsi, 0x0f0f << 16, DSI_PKT_LEN_6_7); + + /* set SOL delay (for non-burst mode only) */ + tegra_dsi_writel(dsi, 8 * mul / div, DSI_SOL_DELAY); + + /* TODO: implement ganged mode */ + } else { + u16 bytes; + + if (dsi->master || dsi->slave) { + /* + * For ganged mode, assume symmetric left-right mode. + */ + bytes = 1 + (mode->hdisplay / 2) * mul / div; + } else { + /* 1 byte (DCS command) + pixel data */ + bytes = 1 + mode->hdisplay * mul / div; + } + + tegra_dsi_writel(dsi, 0, DSI_PKT_LEN_0_1); + tegra_dsi_writel(dsi, bytes << 16, DSI_PKT_LEN_2_3); + tegra_dsi_writel(dsi, bytes << 16, DSI_PKT_LEN_4_5); + tegra_dsi_writel(dsi, 0, DSI_PKT_LEN_6_7); + + value = MIPI_DCS_WRITE_MEMORY_START << 8 | + MIPI_DCS_WRITE_MEMORY_CONTINUE; + tegra_dsi_writel(dsi, value, DSI_DCS_CMDS); + + /* set SOL delay */ + if (dsi->master || dsi->slave) { + unsigned long delay, bclk, bclk_ganged; + unsigned int lanes = state->lanes; + + /* SOL to valid, valid to FIFO and FIFO write delay */ + delay = 4 + 4 + 2; + delay = DIV_ROUND_UP(delay * mul, div * lanes); + /* FIFO read delay */ + delay = delay + 6; + + bclk = DIV_ROUND_UP(mode->htotal * mul, div * lanes); + bclk_ganged = DIV_ROUND_UP(bclk * lanes / 2, lanes); + value = bclk - bclk_ganged + delay + 20; + } else { + /* TODO: revisit for non-ganged mode */ + value = 8 * mul / div; + } + + tegra_dsi_writel(dsi, value, DSI_SOL_DELAY); + } + + if (dsi->slave) { + tegra_dsi_configure(dsi->slave, pipe, mode); + + /* + * TODO: Support modes other than symmetrical left-right + * split. + */ + tegra_dsi_ganged_enable(dsi, 0, mode->hdisplay / 2); + tegra_dsi_ganged_enable(dsi->slave, mode->hdisplay / 2, + mode->hdisplay / 2); + } +} + +static int tegra_dsi_wait_idle(struct tegra_dsi *dsi, unsigned long timeout) +{ + u32 value; + + timeout = jiffies + msecs_to_jiffies(timeout); + + while (time_before(jiffies, timeout)) { + value = tegra_dsi_readl(dsi, DSI_STATUS); + if (value & DSI_STATUS_IDLE) + return 0; + + usleep_range(1000, 2000); + } + + return -ETIMEDOUT; +} + +static void tegra_dsi_video_disable(struct tegra_dsi *dsi) +{ + u32 value; + + value = tegra_dsi_readl(dsi, DSI_CONTROL); + value &= ~DSI_CONTROL_VIDEO_ENABLE; + tegra_dsi_writel(dsi, value, DSI_CONTROL); + + if (dsi->slave) + tegra_dsi_video_disable(dsi->slave); +} + +static void tegra_dsi_ganged_disable(struct tegra_dsi *dsi) +{ + tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_START); + tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_SIZE); + tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_CONTROL); +} + +static void tegra_dsi_set_timeout(struct tegra_dsi *dsi, unsigned long bclk, + unsigned int vrefresh) +{ + unsigned int timeout; + u32 value; + + /* one frame high-speed transmission timeout */ + timeout = (bclk / vrefresh) / 512; + value = DSI_TIMEOUT_LRX(0x2000) | DSI_TIMEOUT_HTX(timeout); + tegra_dsi_writel(dsi, value, DSI_TIMEOUT_0); + + /* 2 ms peripheral timeout for panel */ + timeout = 2 * bclk / 512 * 1000; + value = DSI_TIMEOUT_PR(timeout) | DSI_TIMEOUT_TA(0x2000); + tegra_dsi_writel(dsi, value, DSI_TIMEOUT_1); + + value = DSI_TALLY_TA(0) | DSI_TALLY_LRX(0) | DSI_TALLY_HTX(0); + tegra_dsi_writel(dsi, value, DSI_TO_TALLY); + + if (dsi->slave) + tegra_dsi_set_timeout(dsi->slave, bclk, vrefresh); +} + +static void tegra_dsi_disable(struct tegra_dsi *dsi) +{ + u32 value; + + if (dsi->slave) { + tegra_dsi_ganged_disable(dsi->slave); + tegra_dsi_ganged_disable(dsi); + } + + value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL); + value &= ~DSI_POWER_CONTROL_ENABLE; + tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL); + + if (dsi->slave) + tegra_dsi_disable(dsi->slave); + + usleep_range(5000, 10000); +} + +static void tegra_dsi_soft_reset(struct tegra_dsi *dsi) +{ + u32 value; + + value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL); + value &= ~DSI_POWER_CONTROL_ENABLE; + tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL); + + usleep_range(300, 1000); + + value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL); + value |= DSI_POWER_CONTROL_ENABLE; + tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL); + + usleep_range(300, 1000); + + value = tegra_dsi_readl(dsi, DSI_TRIGGER); + if (value) + tegra_dsi_writel(dsi, 0, DSI_TRIGGER); + + if (dsi->slave) + tegra_dsi_soft_reset(dsi->slave); +} + +static void tegra_dsi_connector_dpms(struct drm_connector *connector, int mode) +{ +} + +static void tegra_dsi_connector_reset(struct drm_connector *connector) +{ + struct tegra_dsi_state *state; + + kfree(connector->state); + connector->state = NULL; + + state = kzalloc(sizeof(*state), GFP_KERNEL); + if (state) + connector->state = &state->base; +} + +static struct drm_connector_state * +tegra_dsi_connector_duplicate_state(struct drm_connector *connector) +{ + struct tegra_dsi_state *state = to_dsi_state(connector->state); + struct tegra_dsi_state *copy; + + copy = kmemdup(state, sizeof(*state), GFP_KERNEL); + if (!copy) + return NULL; + + return ©->base; +} + +static const struct drm_connector_funcs tegra_dsi_connector_funcs = { + .dpms = tegra_dsi_connector_dpms, + .reset = tegra_dsi_connector_reset, + .detect = tegra_output_connector_detect, + .fill_modes = drm_helper_probe_single_connector_modes, + .destroy = tegra_output_connector_destroy, + .atomic_duplicate_state = tegra_dsi_connector_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, +}; + +static enum drm_mode_status +tegra_dsi_connector_mode_valid(struct drm_connector *connector, + struct drm_display_mode *mode) +{ + return MODE_OK; +} + +static const struct drm_connector_helper_funcs tegra_dsi_connector_helper_funcs = { + .get_modes = tegra_output_connector_get_modes, + .mode_valid = tegra_dsi_connector_mode_valid, + .best_encoder = tegra_output_connector_best_encoder, +}; + +static const struct drm_encoder_funcs tegra_dsi_encoder_funcs = { + .destroy = tegra_output_encoder_destroy, +}; + +static void tegra_dsi_encoder_dpms(struct drm_encoder *encoder, int mode) +{ +} + +static void tegra_dsi_encoder_prepare(struct drm_encoder *encoder) +{ +} + +static void tegra_dsi_encoder_commit(struct drm_encoder *encoder) +{ +} + +static void tegra_dsi_encoder_mode_set(struct drm_encoder *encoder, + struct drm_display_mode *mode, + struct drm_display_mode *adjusted) +{ + struct tegra_output *output = encoder_to_output(encoder); + struct tegra_dc *dc = to_tegra_dc(encoder->crtc); + struct tegra_dsi *dsi = to_dsi(output); + struct tegra_dsi_state *state; + u32 value; + + state = tegra_dsi_get_state(dsi); + + tegra_dsi_set_timeout(dsi, state->bclk, state->vrefresh); + + /* + * The D-PHY timing fields are expressed in byte-clock cycles, so + * multiply the period by 8. + */ + tegra_dsi_set_phy_timing(dsi, state->period * 8, &state->timing); + + if (output->panel) + drm_panel_prepare(output->panel); + + tegra_dsi_configure(dsi, dc->pipe, mode); + + /* enable display controller */ + value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS); + value |= DSI_ENABLE; + tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS); + + tegra_dc_commit(dc); + + /* enable DSI controller */ + tegra_dsi_enable(dsi); + + if (output->panel) + drm_panel_enable(output->panel); + + return; +} + +static void tegra_dsi_encoder_disable(struct drm_encoder *encoder) +{ + struct tegra_output *output = encoder_to_output(encoder); + struct tegra_dc *dc = to_tegra_dc(encoder->crtc); + struct tegra_dsi *dsi = to_dsi(output); + u32 value; + int err; + + if (output->panel) + drm_panel_disable(output->panel); + + tegra_dsi_video_disable(dsi); + + /* + * The following accesses registers of the display controller, so make + * sure it's only executed when the output is attached to one. + */ + if (dc) { + value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS); + value &= ~DSI_ENABLE; + tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS); + + tegra_dc_commit(dc); + } + + err = tegra_dsi_wait_idle(dsi, 100); + if (err < 0) + dev_dbg(dsi->dev, "failed to idle DSI: %d\n", err); + + tegra_dsi_soft_reset(dsi); + + if (output->panel) + drm_panel_unprepare(output->panel); + + tegra_dsi_disable(dsi); + + return; +} + +static int +tegra_dsi_encoder_atomic_check(struct drm_encoder *encoder, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state) +{ + struct tegra_output *output = encoder_to_output(encoder); + struct tegra_dsi_state *state = to_dsi_state(conn_state); + struct tegra_dc *dc = to_tegra_dc(conn_state->crtc); + struct tegra_dsi *dsi = to_dsi(output); + unsigned int scdiv; + unsigned long plld; + int err; + + state->pclk = crtc_state->mode.clock * 1000; + + err = tegra_dsi_get_muldiv(dsi->format, &state->mul, &state->div); + if (err < 0) + return err; + + state->lanes = tegra_dsi_get_lanes(dsi); + + err = tegra_dsi_get_format(dsi->format, &state->format); + if (err < 0) + return err; + + state->vrefresh = drm_mode_vrefresh(&crtc_state->mode); + + /* compute byte clock */ + state->bclk = (state->pclk * state->mul) / (state->div * state->lanes); + + DRM_DEBUG_KMS("mul: %u, div: %u, lanes: %u\n", state->mul, state->div, + state->lanes); + DRM_DEBUG_KMS("format: %u, vrefresh: %u\n", state->format, + state->vrefresh); + DRM_DEBUG_KMS("bclk: %lu\n", state->bclk); + + /* + * Compute bit clock and round up to the next MHz. + */ + plld = DIV_ROUND_UP(state->bclk * 8, USEC_PER_SEC) * USEC_PER_SEC; + state->period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, plld); + + err = mipi_dphy_timing_get_default(&state->timing, state->period); + if (err < 0) + return err; + + err = mipi_dphy_timing_validate(&state->timing, state->period); + if (err < 0) { + dev_err(dsi->dev, "failed to validate D-PHY timing: %d\n", err); + return err; + } + + /* + * We divide the frequency by two here, but we make up for that by + * setting the shift clock divider (further below) to half of the + * correct value. + */ + plld /= 2; + + /* + * Derive pixel clock from bit clock using the shift clock divider. + * Note that this is only half of what we would expect, but we need + * that to make up for the fact that we divided the bit clock by a + * factor of two above. + * + * It's not clear exactly why this is necessary, but the display is + * not working properly otherwise. Perhaps the PLLs cannot generate + * frequencies sufficiently high. + */ + scdiv = ((8 * state->mul) / (state->div * state->lanes)) - 2; + + err = tegra_dc_state_setup_clock(dc, crtc_state, dsi->clk_parent, + plld, scdiv); + if (err < 0) { + dev_err(output->dev, "failed to setup CRTC state: %d\n", err); + return err; + } + + return err; +} + +static const struct drm_encoder_helper_funcs tegra_dsi_encoder_helper_funcs = { + .dpms = tegra_dsi_encoder_dpms, + .prepare = tegra_dsi_encoder_prepare, + .commit = tegra_dsi_encoder_commit, + .mode_set = tegra_dsi_encoder_mode_set, + .disable = tegra_dsi_encoder_disable, + .atomic_check = tegra_dsi_encoder_atomic_check, +}; + +static int tegra_dsi_pad_enable(struct tegra_dsi *dsi) +{ + u32 value; + + value = DSI_PAD_CONTROL_VS1_PULLDN(0) | DSI_PAD_CONTROL_VS1_PDIO(0); + tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_0); + + return 0; +} + +static int tegra_dsi_pad_calibrate(struct tegra_dsi *dsi) +{ + u32 value; + + tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_0); + tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_1); + tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_2); + tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_3); + tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_4); + + /* start calibration */ + tegra_dsi_pad_enable(dsi); + + value = DSI_PAD_SLEW_UP(0x7) | DSI_PAD_SLEW_DN(0x7) | + DSI_PAD_LP_UP(0x1) | DSI_PAD_LP_DN(0x1) | + DSI_PAD_OUT_CLK(0x0); + tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_2); + + return tegra_mipi_calibrate(dsi->mipi); +} + +static int tegra_dsi_init(struct host1x_client *client) +{ + struct drm_device *drm = dev_get_drvdata(client->parent); + struct tegra_dsi *dsi = host1x_client_to_dsi(client); + int err; + + reset_control_deassert(dsi->rst); + + err = tegra_dsi_pad_calibrate(dsi); + if (err < 0) { + dev_err(dsi->dev, "MIPI calibration failed: %d\n", err); + goto reset; + } + + /* Gangsters must not register their own outputs. */ + if (!dsi->master) { + dsi->output.dev = client->dev; + + drm_connector_init(drm, &dsi->output.connector, + &tegra_dsi_connector_funcs, + DRM_MODE_CONNECTOR_DSI); + drm_connector_helper_add(&dsi->output.connector, + &tegra_dsi_connector_helper_funcs); + dsi->output.connector.dpms = DRM_MODE_DPMS_OFF; + + drm_encoder_init(drm, &dsi->output.encoder, + &tegra_dsi_encoder_funcs, + DRM_MODE_ENCODER_DSI); + drm_encoder_helper_add(&dsi->output.encoder, + &tegra_dsi_encoder_helper_funcs); + + drm_mode_connector_attach_encoder(&dsi->output.connector, + &dsi->output.encoder); + drm_connector_register(&dsi->output.connector); + + err = tegra_output_init(drm, &dsi->output); + if (err < 0) { + dev_err(client->dev, + "failed to initialize output: %d\n", + err); + goto reset; + } + + dsi->output.encoder.possible_crtcs = 0x3; + } + + if (IS_ENABLED(CONFIG_DEBUG_FS)) { + err = tegra_dsi_debugfs_init(dsi, drm->primary); + if (err < 0) + dev_err(dsi->dev, "debugfs setup failed: %d\n", err); + } + + return 0; + +reset: + reset_control_assert(dsi->rst); + return err; +} + +static int tegra_dsi_exit(struct host1x_client *client) +{ + struct tegra_dsi *dsi = host1x_client_to_dsi(client); + + tegra_output_exit(&dsi->output); + + if (IS_ENABLED(CONFIG_DEBUG_FS)) + tegra_dsi_debugfs_exit(dsi); + + reset_control_assert(dsi->rst); + + return 0; +} + +static const struct host1x_client_ops dsi_client_ops = { + .init = tegra_dsi_init, + .exit = tegra_dsi_exit, +}; + +static int tegra_dsi_setup_clocks(struct tegra_dsi *dsi) +{ + struct clk *parent; + int err; + + parent = clk_get_parent(dsi->clk); + if (!parent) + return -EINVAL; + + err = clk_set_parent(parent, dsi->clk_parent); + if (err < 0) + return err; + + return 0; +} + +static const char * const error_report[16] = { + "SoT Error", + "SoT Sync Error", + "EoT Sync Error", + "Escape Mode Entry Command Error", + "Low-Power Transmit Sync Error", + "Peripheral Timeout Error", + "False Control Error", + "Contention Detected", + "ECC Error, single-bit", + "ECC Error, multi-bit", + "Checksum Error", + "DSI Data Type Not Recognized", + "DSI VC ID Invalid", + "Invalid Transmission Length", + "Reserved", + "DSI Protocol Violation", +}; + +static ssize_t tegra_dsi_read_response(struct tegra_dsi *dsi, + const struct mipi_dsi_msg *msg, + size_t count) +{ + u8 *rx = msg->rx_buf; + unsigned int i, j, k; + size_t size = 0; + u16 errors; + u32 value; + + /* read and parse packet header */ + value = tegra_dsi_readl(dsi, DSI_RD_DATA); + + switch (value & 0x3f) { + case MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT: + errors = (value >> 8) & 0xffff; + dev_dbg(dsi->dev, "Acknowledge and error report: %04x\n", + errors); + for (i = 0; i < ARRAY_SIZE(error_report); i++) + if (errors & BIT(i)) + dev_dbg(dsi->dev, " %2u: %s\n", i, + error_report[i]); + break; + + case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_1BYTE: + rx[0] = (value >> 8) & 0xff; + size = 1; + break; + + case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_2BYTE: + rx[0] = (value >> 8) & 0xff; + rx[1] = (value >> 16) & 0xff; + size = 2; + break; + + case MIPI_DSI_RX_DCS_LONG_READ_RESPONSE: + size = ((value >> 8) & 0xff00) | ((value >> 8) & 0xff); + break; + + case MIPI_DSI_RX_GENERIC_LONG_READ_RESPONSE: + size = ((value >> 8) & 0xff00) | ((value >> 8) & 0xff); + break; + + default: + dev_err(dsi->dev, "unhandled response type: %02x\n", + value & 0x3f); + return -EPROTO; + } + + size = min(size, msg->rx_len); + + if (msg->rx_buf && size > 0) { + for (i = 0, j = 0; i < count - 1; i++, j += 4) { + u8 *rx = msg->rx_buf + j; + + value = tegra_dsi_readl(dsi, DSI_RD_DATA); + + for (k = 0; k < 4 && (j + k) < msg->rx_len; k++) + rx[j + k] = (value >> (k << 3)) & 0xff; + } + } + + return size; +} + +static int tegra_dsi_transmit(struct tegra_dsi *dsi, unsigned long timeout) +{ + tegra_dsi_writel(dsi, DSI_TRIGGER_HOST, DSI_TRIGGER); + + timeout = jiffies + msecs_to_jiffies(timeout); + + while (time_before(jiffies, timeout)) { + u32 value = tegra_dsi_readl(dsi, DSI_TRIGGER); + if ((value & DSI_TRIGGER_HOST) == 0) + return 0; + + usleep_range(1000, 2000); + } + + DRM_DEBUG_KMS("timeout waiting for transmission to complete\n"); + return -ETIMEDOUT; +} + +static int tegra_dsi_wait_for_response(struct tegra_dsi *dsi, + unsigned long timeout) +{ + timeout = jiffies + msecs_to_jiffies(250); + + while (time_before(jiffies, timeout)) { + u32 value = tegra_dsi_readl(dsi, DSI_STATUS); + u8 count = value & 0x1f; + + if (count > 0) + return count; + + usleep_range(1000, 2000); + } + + DRM_DEBUG_KMS("peripheral returned no data\n"); + return -ETIMEDOUT; +} + +static void tegra_dsi_writesl(struct tegra_dsi *dsi, unsigned long offset, + const void *buffer, size_t size) +{ + const u8 *buf = buffer; + size_t i, j; + u32 value; + + for (j = 0; j < size; j += 4) { + value = 0; + + for (i = 0; i < 4 && j + i < size; i++) + value |= buf[j + i] << (i << 3); + + tegra_dsi_writel(dsi, value, DSI_WR_DATA); + } +} + +static ssize_t tegra_dsi_host_transfer(struct mipi_dsi_host *host, + const struct mipi_dsi_msg *msg) +{ + struct tegra_dsi *dsi = host_to_tegra(host); + struct mipi_dsi_packet packet; + const u8 *header; + size_t count; + ssize_t err; + u32 value; + + err = mipi_dsi_create_packet(&packet, msg); + if (err < 0) + return err; + + header = packet.header; + + /* maximum FIFO depth is 1920 words */ + if (packet.size > dsi->video_fifo_depth * 4) + return -ENOSPC; + + /* reset underflow/overflow flags */ + value = tegra_dsi_readl(dsi, DSI_STATUS); + if (value & (DSI_STATUS_UNDERFLOW | DSI_STATUS_OVERFLOW)) { + value = DSI_HOST_CONTROL_FIFO_RESET; + tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL); + usleep_range(10, 20); + } + + value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL); + value |= DSI_POWER_CONTROL_ENABLE; + tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL); + + usleep_range(5000, 10000); + + value = DSI_HOST_CONTROL_CRC_RESET | DSI_HOST_CONTROL_TX_TRIG_HOST | + DSI_HOST_CONTROL_CS | DSI_HOST_CONTROL_ECC; + + if ((msg->flags & MIPI_DSI_MSG_USE_LPM) == 0) + value |= DSI_HOST_CONTROL_HS; + + /* + * The host FIFO has a maximum of 64 words, so larger transmissions + * need to use the video FIFO. + */ + if (packet.size > dsi->host_fifo_depth * 4) + value |= DSI_HOST_CONTROL_FIFO_SEL; + + tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL); + + /* + * For reads and messages with explicitly requested ACK, generate a + * BTA sequence after the transmission of the packet. + */ + if ((msg->flags & MIPI_DSI_MSG_REQ_ACK) || + (msg->rx_buf && msg->rx_len > 0)) { + value = tegra_dsi_readl(dsi, DSI_HOST_CONTROL); + value |= DSI_HOST_CONTROL_PKT_BTA; + tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL); + } + + value = DSI_CONTROL_LANES(0) | DSI_CONTROL_HOST_ENABLE; + tegra_dsi_writel(dsi, value, DSI_CONTROL); + + /* write packet header, ECC is generated by hardware */ + value = header[2] << 16 | header[1] << 8 | header[0]; + tegra_dsi_writel(dsi, value, DSI_WR_DATA); + + /* write payload (if any) */ + if (packet.payload_length > 0) + tegra_dsi_writesl(dsi, DSI_WR_DATA, packet.payload, + packet.payload_length); + + err = tegra_dsi_transmit(dsi, 250); + if (err < 0) + return err; + + if ((msg->flags & MIPI_DSI_MSG_REQ_ACK) || + (msg->rx_buf && msg->rx_len > 0)) { + err = tegra_dsi_wait_for_response(dsi, 250); + if (err < 0) + return err; + + count = err; + + value = tegra_dsi_readl(dsi, DSI_RD_DATA); + switch (value) { + case 0x84: + /* + dev_dbg(dsi->dev, "ACK\n"); + */ + break; + + case 0x87: + /* + dev_dbg(dsi->dev, "ESCAPE\n"); + */ + break; + + default: + dev_err(dsi->dev, "unknown status: %08x\n", value); + break; + } + + if (count > 1) { + err = tegra_dsi_read_response(dsi, msg, count); + if (err < 0) + dev_err(dsi->dev, + "failed to parse response: %zd\n", + err); + else { + /* + * For read commands, return the number of + * bytes returned by the peripheral. + */ + count = err; + } + } + } else { + /* + * For write commands, we have transmitted the 4-byte header + * plus the variable-length payload. + */ + count = 4 + packet.payload_length; + } + + return count; +} + +static int tegra_dsi_ganged_setup(struct tegra_dsi *dsi) +{ + struct clk *parent; + int err; + + /* make sure both DSI controllers share the same PLL */ + parent = clk_get_parent(dsi->slave->clk); + if (!parent) + return -EINVAL; + + err = clk_set_parent(parent, dsi->clk_parent); + if (err < 0) + return err; + + return 0; +} + +static int tegra_dsi_host_attach(struct mipi_dsi_host *host, + struct mipi_dsi_device *device) +{ + struct tegra_dsi *dsi = host_to_tegra(host); + + dsi->flags = device->mode_flags; + dsi->format = device->format; + dsi->lanes = device->lanes; + + if (dsi->slave) { + int err; + + dev_dbg(dsi->dev, "attaching dual-channel device %s\n", + dev_name(&device->dev)); + + err = tegra_dsi_ganged_setup(dsi); + if (err < 0) { + dev_err(dsi->dev, "failed to set up ganged mode: %d\n", + err); + return err; + } + } + + /* + * Slaves don't have a panel associated with them, so they provide + * merely the second channel. + */ + if (!dsi->master) { + struct tegra_output *output = &dsi->output; + + output->panel = of_drm_find_panel(device->dev.of_node); + if (output->panel && output->connector.dev) { + drm_panel_attach(output->panel, &output->connector); + drm_helper_hpd_irq_event(output->connector.dev); + } + } + + return 0; +} + +static int tegra_dsi_host_detach(struct mipi_dsi_host *host, + struct mipi_dsi_device *device) +{ + struct tegra_dsi *dsi = host_to_tegra(host); + struct tegra_output *output = &dsi->output; + + if (output->panel && &device->dev == output->panel->dev) { + output->panel = NULL; + + if (output->connector.dev) + drm_helper_hpd_irq_event(output->connector.dev); + } + + return 0; +} + +static const struct mipi_dsi_host_ops tegra_dsi_host_ops = { + .attach = tegra_dsi_host_attach, + .detach = tegra_dsi_host_detach, + .transfer = tegra_dsi_host_transfer, +}; + +static int tegra_dsi_ganged_probe(struct tegra_dsi *dsi) +{ + struct device_node *np; + + np = of_parse_phandle(dsi->dev->of_node, "nvidia,ganged-mode", 0); + if (np) { + struct platform_device *gangster = of_find_device_by_node(np); + + dsi->slave = platform_get_drvdata(gangster); + of_node_put(np); + + if (!dsi->slave) + return -EPROBE_DEFER; + + dsi->slave->master = dsi; + } + + return 0; +} + +static int tegra_dsi_probe(struct platform_device *pdev) +{ + struct tegra_dsi *dsi; + struct resource *regs; + int err; + + dsi = devm_kzalloc(&pdev->dev, sizeof(*dsi), GFP_KERNEL); + if (!dsi) + return -ENOMEM; + + dsi->output.dev = dsi->dev = &pdev->dev; + dsi->video_fifo_depth = 1920; + dsi->host_fifo_depth = 64; + + err = tegra_dsi_ganged_probe(dsi); + if (err < 0) + return err; + + err = tegra_output_probe(&dsi->output); + if (err < 0) + return err; + + dsi->output.connector.polled = DRM_CONNECTOR_POLL_HPD; + + /* + * Assume these values by default. When a DSI peripheral driver + * attaches to the DSI host, the parameters will be taken from + * the attached device. + */ + dsi->flags = MIPI_DSI_MODE_VIDEO; + dsi->format = MIPI_DSI_FMT_RGB888; + dsi->lanes = 4; + + dsi->rst = devm_reset_control_get(&pdev->dev, "dsi"); + if (IS_ERR(dsi->rst)) + return PTR_ERR(dsi->rst); + + dsi->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(dsi->clk)) { + dev_err(&pdev->dev, "cannot get DSI clock\n"); + err = PTR_ERR(dsi->clk); + goto reset; + } + + err = clk_prepare_enable(dsi->clk); + if (err < 0) { + dev_err(&pdev->dev, "cannot enable DSI clock\n"); + goto reset; + } + + dsi->clk_lp = devm_clk_get(&pdev->dev, "lp"); + if (IS_ERR(dsi->clk_lp)) { + dev_err(&pdev->dev, "cannot get low-power clock\n"); + err = PTR_ERR(dsi->clk_lp); + goto disable_clk; + } + + err = clk_prepare_enable(dsi->clk_lp); + if (err < 0) { + dev_err(&pdev->dev, "cannot enable low-power clock\n"); + goto disable_clk; + } + + dsi->clk_parent = devm_clk_get(&pdev->dev, "parent"); + if (IS_ERR(dsi->clk_parent)) { + dev_err(&pdev->dev, "cannot get parent clock\n"); + err = PTR_ERR(dsi->clk_parent); + goto disable_clk_lp; + } + + dsi->vdd = devm_regulator_get(&pdev->dev, "avdd-dsi-csi"); + if (IS_ERR(dsi->vdd)) { + dev_err(&pdev->dev, "cannot get VDD supply\n"); + err = PTR_ERR(dsi->vdd); + goto disable_clk_lp; + } + + err = regulator_enable(dsi->vdd); + if (err < 0) { + dev_err(&pdev->dev, "cannot enable VDD supply\n"); + goto disable_clk_lp; + } + + err = tegra_dsi_setup_clocks(dsi); + if (err < 0) { + dev_err(&pdev->dev, "cannot setup clocks\n"); + goto disable_vdd; + } + + regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); + dsi->regs = devm_ioremap_resource(&pdev->dev, regs); + if (IS_ERR(dsi->regs)) { + err = PTR_ERR(dsi->regs); + goto disable_vdd; + } + + dsi->mipi = tegra_mipi_request(&pdev->dev); + if (IS_ERR(dsi->mipi)) { + err = PTR_ERR(dsi->mipi); + goto disable_vdd; + } + + dsi->host.ops = &tegra_dsi_host_ops; + dsi->host.dev = &pdev->dev; + + err = mipi_dsi_host_register(&dsi->host); + if (err < 0) { + dev_err(&pdev->dev, "failed to register DSI host: %d\n", err); + goto mipi_free; + } + + INIT_LIST_HEAD(&dsi->client.list); + dsi->client.ops = &dsi_client_ops; + dsi->client.dev = &pdev->dev; + + err = host1x_client_register(&dsi->client); + if (err < 0) { + dev_err(&pdev->dev, "failed to register host1x client: %d\n", + err); + goto unregister; + } + + platform_set_drvdata(pdev, dsi); + + return 0; + +unregister: + mipi_dsi_host_unregister(&dsi->host); +mipi_free: + tegra_mipi_free(dsi->mipi); +disable_vdd: + regulator_disable(dsi->vdd); +disable_clk_lp: + clk_disable_unprepare(dsi->clk_lp); +disable_clk: + clk_disable_unprepare(dsi->clk); +reset: + reset_control_assert(dsi->rst); + return err; +} + +static int tegra_dsi_remove(struct platform_device *pdev) +{ + struct tegra_dsi *dsi = platform_get_drvdata(pdev); + int err; + + err = host1x_client_unregister(&dsi->client); + if (err < 0) { + dev_err(&pdev->dev, "failed to unregister host1x client: %d\n", + err); + return err; + } + + tegra_output_remove(&dsi->output); + + mipi_dsi_host_unregister(&dsi->host); + tegra_mipi_free(dsi->mipi); + + regulator_disable(dsi->vdd); + clk_disable_unprepare(dsi->clk_lp); + clk_disable_unprepare(dsi->clk); + reset_control_assert(dsi->rst); + + return 0; +} + +static const struct of_device_id tegra_dsi_of_match[] = { + { .compatible = "nvidia,tegra114-dsi", }, + { }, +}; +MODULE_DEVICE_TABLE(of, tegra_dsi_of_match); + +struct platform_driver tegra_dsi_driver = { + .driver = { + .name = "tegra-dsi", + .of_match_table = tegra_dsi_of_match, + }, + .probe = tegra_dsi_probe, + .remove = tegra_dsi_remove, +}; |