diff options
author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-12-15 14:52:16 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-12-15 14:52:16 -0300 |
commit | 8d91c1e411f55d7ea91b1183a2e9f8088fb4d5be (patch) | |
tree | e9891aa6c295060d065adffd610c4f49ecf884f3 /drivers/gpu/drm/bridge/ps8622.c | |
parent | a71852147516bc1cb5b0b3cbd13639bfd4022dc8 (diff) |
Linux-libre 4.3.2-gnu
Diffstat (limited to 'drivers/gpu/drm/bridge/ps8622.c')
-rw-r--r-- | drivers/gpu/drm/bridge/ps8622.c | 679 |
1 files changed, 0 insertions, 679 deletions
diff --git a/drivers/gpu/drm/bridge/ps8622.c b/drivers/gpu/drm/bridge/ps8622.c deleted file mode 100644 index 1a6607beb..000000000 --- a/drivers/gpu/drm/bridge/ps8622.c +++ /dev/null @@ -1,679 +0,0 @@ -/* - * Parade PS8622 eDP/LVDS bridge driver - * - * Copyright (C) 2014 Google, Inc. - * - * This software is licensed under the terms of the GNU General Public - * License version 2, as published by the Free Software Foundation, and - * may be copied, distributed, and modified under those terms. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - */ - -#include <linux/backlight.h> -#include <linux/delay.h> -#include <linux/err.h> -#include <linux/fb.h> -#include <linux/gpio.h> -#include <linux/gpio/consumer.h> -#include <linux/i2c.h> -#include <linux/module.h> -#include <linux/of.h> -#include <linux/of_device.h> -#include <linux/of_graph.h> -#include <linux/pm.h> -#include <linux/regulator/consumer.h> - -#include <drm/drm_panel.h> - -#include "drmP.h" -#include "drm_crtc.h" -#include "drm_crtc_helper.h" -#include "drm_atomic_helper.h" - -/* Brightness scale on the Parade chip */ -#define PS8622_MAX_BRIGHTNESS 0xff - -/* Timings taken from the version 1.7 datasheet for the PS8622/PS8625 */ -#define PS8622_POWER_RISE_T1_MIN_US 10 -#define PS8622_POWER_RISE_T1_MAX_US 10000 -#define PS8622_RST_HIGH_T2_MIN_US 3000 -#define PS8622_RST_HIGH_T2_MAX_US 30000 -#define PS8622_PWMO_END_T12_MS 200 -#define PS8622_POWER_FALL_T16_MAX_US 10000 -#define PS8622_POWER_OFF_T17_MS 500 - -#if ((PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US) > \ - (PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US)) -#error "T2.min + T1.max must be less than T2.max + T1.min" -#endif - -struct ps8622_bridge { - struct drm_connector connector; - struct i2c_client *client; - struct drm_bridge bridge; - struct drm_panel *panel; - struct regulator *v12; - struct backlight_device *bl; - - struct gpio_desc *gpio_slp; - struct gpio_desc *gpio_rst; - - u32 max_lane_count; - u32 lane_count; - - bool enabled; -}; - -static inline struct ps8622_bridge * - bridge_to_ps8622(struct drm_bridge *bridge) -{ - return container_of(bridge, struct ps8622_bridge, bridge); -} - -static inline struct ps8622_bridge * - connector_to_ps8622(struct drm_connector *connector) -{ - return container_of(connector, struct ps8622_bridge, connector); -} - -static int ps8622_set(struct i2c_client *client, u8 page, u8 reg, u8 val) -{ - int ret; - struct i2c_adapter *adap = client->adapter; - struct i2c_msg msg; - u8 data[] = {reg, val}; - - msg.addr = client->addr + page; - msg.flags = 0; - msg.len = sizeof(data); - msg.buf = data; - - ret = i2c_transfer(adap, &msg, 1); - if (ret != 1) - pr_warn("PS8622 I2C write (0x%02x,0x%02x,0x%02x) failed: %d\n", - client->addr + page, reg, val, ret); - return !(ret == 1); -} - -static int ps8622_send_config(struct ps8622_bridge *ps8622) -{ - struct i2c_client *cl = ps8622->client; - int err = 0; - - /* HPD low */ - err = ps8622_set(cl, 0x02, 0xa1, 0x01); - if (err) - goto error; - - /* SW setting: [1:0] SW output 1.2V voltage is lower to 96% */ - err = ps8622_set(cl, 0x04, 0x14, 0x01); - if (err) - goto error; - - /* RCO SS setting: [5:4] = b01 0.5%, b10 1%, b11 1.5% */ - err = ps8622_set(cl, 0x04, 0xe3, 0x20); - if (err) - goto error; - - /* [7] RCO SS enable */ - err = ps8622_set(cl, 0x04, 0xe2, 0x80); - if (err) - goto error; - - /* RPHY Setting - * [3:2] CDR tune wait cycle before measure for fine tune - * b00: 1us b01: 0.5us b10:2us, b11: 4us - */ - err = ps8622_set(cl, 0x04, 0x8a, 0x0c); - if (err) - goto error; - - /* [3] RFD always on */ - err = ps8622_set(cl, 0x04, 0x89, 0x08); - if (err) - goto error; - - /* CTN lock in/out: 20000ppm/80000ppm. Lock out 2 times. */ - err = ps8622_set(cl, 0x04, 0x71, 0x2d); - if (err) - goto error; - - /* 2.7G CDR settings: NOF=40LSB for HBR CDR setting */ - err = ps8622_set(cl, 0x04, 0x7d, 0x07); - if (err) - goto error; - - /* [1:0] Fmin=+4bands */ - err = ps8622_set(cl, 0x04, 0x7b, 0x00); - if (err) - goto error; - - /* [7:5] DCO_FTRNG=+-40% */ - err = ps8622_set(cl, 0x04, 0x7a, 0xfd); - if (err) - goto error; - - /* 1.62G CDR settings: [5:2]NOF=64LSB [1:0]DCO scale is 2/5 */ - err = ps8622_set(cl, 0x04, 0xc0, 0x12); - if (err) - goto error; - - /* Gitune=-37% */ - err = ps8622_set(cl, 0x04, 0xc1, 0x92); - if (err) - goto error; - - /* Fbstep=100% */ - err = ps8622_set(cl, 0x04, 0xc2, 0x1c); - if (err) - goto error; - - /* [7] LOS signal disable */ - err = ps8622_set(cl, 0x04, 0x32, 0x80); - if (err) - goto error; - - /* RPIO Setting: [7:4] LVDS driver bias current : 75% (250mV swing) */ - err = ps8622_set(cl, 0x04, 0x00, 0xb0); - if (err) - goto error; - - /* [7:6] Right-bar GPIO output strength is 8mA */ - err = ps8622_set(cl, 0x04, 0x15, 0x40); - if (err) - goto error; - - /* EQ Training State Machine Setting, RCO calibration start */ - err = ps8622_set(cl, 0x04, 0x54, 0x10); - if (err) - goto error; - - /* Logic, needs more than 10 I2C command */ - /* [4:0] MAX_LANE_COUNT set to max supported lanes */ - err = ps8622_set(cl, 0x01, 0x02, 0x80 | ps8622->max_lane_count); - if (err) - goto error; - - /* [4:0] LANE_COUNT_SET set to chosen lane count */ - err = ps8622_set(cl, 0x01, 0x21, 0x80 | ps8622->lane_count); - if (err) - goto error; - - err = ps8622_set(cl, 0x00, 0x52, 0x20); - if (err) - goto error; - - /* HPD CP toggle enable */ - err = ps8622_set(cl, 0x00, 0xf1, 0x03); - if (err) - goto error; - - err = ps8622_set(cl, 0x00, 0x62, 0x41); - if (err) - goto error; - - /* Counter number, add 1ms counter delay */ - err = ps8622_set(cl, 0x00, 0xf6, 0x01); - if (err) - goto error; - - /* [6]PWM function control by DPCD0040f[7], default is PWM block */ - err = ps8622_set(cl, 0x00, 0x77, 0x06); - if (err) - goto error; - - /* 04h Adjust VTotal toleranceto fix the 30Hz no display issue */ - err = ps8622_set(cl, 0x00, 0x4c, 0x04); - if (err) - goto error; - - /* DPCD00400='h00, Parade OUI ='h001cf8 */ - err = ps8622_set(cl, 0x01, 0xc0, 0x00); - if (err) - goto error; - - /* DPCD00401='h1c */ - err = ps8622_set(cl, 0x01, 0xc1, 0x1c); - if (err) - goto error; - - /* DPCD00402='hf8 */ - err = ps8622_set(cl, 0x01, 0xc2, 0xf8); - if (err) - goto error; - - /* DPCD403~408 = ASCII code, D2SLV5='h4432534c5635 */ - err = ps8622_set(cl, 0x01, 0xc3, 0x44); - if (err) - goto error; - - /* DPCD404 */ - err = ps8622_set(cl, 0x01, 0xc4, 0x32); - if (err) - goto error; - - /* DPCD405 */ - err = ps8622_set(cl, 0x01, 0xc5, 0x53); - if (err) - goto error; - - /* DPCD406 */ - err = ps8622_set(cl, 0x01, 0xc6, 0x4c); - if (err) - goto error; - - /* DPCD407 */ - err = ps8622_set(cl, 0x01, 0xc7, 0x56); - if (err) - goto error; - - /* DPCD408 */ - err = ps8622_set(cl, 0x01, 0xc8, 0x35); - if (err) - goto error; - - /* DPCD40A, Initial Code major revision '01' */ - err = ps8622_set(cl, 0x01, 0xca, 0x01); - if (err) - goto error; - - /* DPCD40B, Initial Code minor revision '05' */ - err = ps8622_set(cl, 0x01, 0xcb, 0x05); - if (err) - goto error; - - - if (ps8622->bl) { - /* DPCD720, internal PWM */ - err = ps8622_set(cl, 0x01, 0xa5, 0xa0); - if (err) - goto error; - - /* FFh for 100% brightness, 0h for 0% brightness */ - err = ps8622_set(cl, 0x01, 0xa7, - ps8622->bl->props.brightness); - if (err) - goto error; - } else { - /* DPCD720, external PWM */ - err = ps8622_set(cl, 0x01, 0xa5, 0x80); - if (err) - goto error; - } - - /* Set LVDS output as 6bit-VESA mapping, single LVDS channel */ - err = ps8622_set(cl, 0x01, 0xcc, 0x13); - if (err) - goto error; - - /* Enable SSC set by register */ - err = ps8622_set(cl, 0x02, 0xb1, 0x20); - if (err) - goto error; - - /* Set SSC enabled and +/-1% central spreading */ - err = ps8622_set(cl, 0x04, 0x10, 0x16); - if (err) - goto error; - - /* Logic end */ - /* MPU Clock source: LC => RCO */ - err = ps8622_set(cl, 0x04, 0x59, 0x60); - if (err) - goto error; - - /* LC -> RCO */ - err = ps8622_set(cl, 0x04, 0x54, 0x14); - if (err) - goto error; - - /* HPD high */ - err = ps8622_set(cl, 0x02, 0xa1, 0x91); - -error: - return err ? -EIO : 0; -} - -static int ps8622_backlight_update(struct backlight_device *bl) -{ - struct ps8622_bridge *ps8622 = dev_get_drvdata(&bl->dev); - int ret, brightness = bl->props.brightness; - - if (bl->props.power != FB_BLANK_UNBLANK || - bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) - brightness = 0; - - if (!ps8622->enabled) - return -EINVAL; - - ret = ps8622_set(ps8622->client, 0x01, 0xa7, brightness); - - return ret; -} - -static const struct backlight_ops ps8622_backlight_ops = { - .update_status = ps8622_backlight_update, -}; - -static void ps8622_pre_enable(struct drm_bridge *bridge) -{ - struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); - int ret; - - if (ps8622->enabled) - return; - - gpiod_set_value(ps8622->gpio_rst, 0); - - if (ps8622->v12) { - ret = regulator_enable(ps8622->v12); - if (ret) - DRM_ERROR("fails to enable ps8622->v12"); - } - - if (drm_panel_prepare(ps8622->panel)) { - DRM_ERROR("failed to prepare panel\n"); - return; - } - - gpiod_set_value(ps8622->gpio_slp, 1); - - /* - * T1 is the range of time that it takes for the power to rise after we - * enable the lcd/ps8622 fet. T2 is the range of time in which the - * data sheet specifies we should deassert the reset pin. - * - * If it takes T1.max for the power to rise, we need to wait atleast - * T2.min before deasserting the reset pin. If it takes T1.min for the - * power to rise, we need to wait at most T2.max before deasserting the - * reset pin. - */ - usleep_range(PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US, - PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US); - - gpiod_set_value(ps8622->gpio_rst, 1); - - /* wait 20ms after RST high */ - usleep_range(20000, 30000); - - ret = ps8622_send_config(ps8622); - if (ret) { - DRM_ERROR("Failed to send config to bridge (%d)\n", ret); - return; - } - - ps8622->enabled = true; -} - -static void ps8622_enable(struct drm_bridge *bridge) -{ - struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); - - if (drm_panel_enable(ps8622->panel)) { - DRM_ERROR("failed to enable panel\n"); - return; - } -} - -static void ps8622_disable(struct drm_bridge *bridge) -{ - struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); - - if (drm_panel_disable(ps8622->panel)) { - DRM_ERROR("failed to disable panel\n"); - return; - } - msleep(PS8622_PWMO_END_T12_MS); -} - -static void ps8622_post_disable(struct drm_bridge *bridge) -{ - struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); - - if (!ps8622->enabled) - return; - - ps8622->enabled = false; - - /* - * This doesn't matter if the regulators are turned off, but something - * else might keep them on. In that case, we want to assert the slp gpio - * to lower power. - */ - gpiod_set_value(ps8622->gpio_slp, 0); - - if (drm_panel_unprepare(ps8622->panel)) { - DRM_ERROR("failed to unprepare panel\n"); - return; - } - - if (ps8622->v12) - regulator_disable(ps8622->v12); - - /* - * Sleep for at least the amount of time that it takes the power rail to - * fall to prevent asserting the rst gpio from doing anything. - */ - usleep_range(PS8622_POWER_FALL_T16_MAX_US, - 2 * PS8622_POWER_FALL_T16_MAX_US); - gpiod_set_value(ps8622->gpio_rst, 0); - - msleep(PS8622_POWER_OFF_T17_MS); -} - -static int ps8622_get_modes(struct drm_connector *connector) -{ - struct ps8622_bridge *ps8622; - - ps8622 = connector_to_ps8622(connector); - - return drm_panel_get_modes(ps8622->panel); -} - -static struct drm_encoder *ps8622_best_encoder(struct drm_connector *connector) -{ - struct ps8622_bridge *ps8622; - - ps8622 = connector_to_ps8622(connector); - - return ps8622->bridge.encoder; -} - -static const struct drm_connector_helper_funcs ps8622_connector_helper_funcs = { - .get_modes = ps8622_get_modes, - .best_encoder = ps8622_best_encoder, -}; - -static enum drm_connector_status ps8622_detect(struct drm_connector *connector, - bool force) -{ - return connector_status_connected; -} - -static void ps8622_connector_destroy(struct drm_connector *connector) -{ - drm_connector_cleanup(connector); -} - -static const struct drm_connector_funcs ps8622_connector_funcs = { - .dpms = drm_atomic_helper_connector_dpms, - .fill_modes = drm_helper_probe_single_connector_modes, - .detect = ps8622_detect, - .destroy = ps8622_connector_destroy, - .reset = drm_atomic_helper_connector_reset, - .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, - .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, -}; - -static int ps8622_attach(struct drm_bridge *bridge) -{ - struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); - int ret; - - if (!bridge->encoder) { - DRM_ERROR("Parent encoder object not found"); - return -ENODEV; - } - - ps8622->connector.polled = DRM_CONNECTOR_POLL_HPD; - ret = drm_connector_init(bridge->dev, &ps8622->connector, - &ps8622_connector_funcs, DRM_MODE_CONNECTOR_LVDS); - if (ret) { - DRM_ERROR("Failed to initialize connector with drm\n"); - return ret; - } - drm_connector_helper_add(&ps8622->connector, - &ps8622_connector_helper_funcs); - drm_connector_register(&ps8622->connector); - drm_mode_connector_attach_encoder(&ps8622->connector, - bridge->encoder); - - if (ps8622->panel) - drm_panel_attach(ps8622->panel, &ps8622->connector); - - drm_helper_hpd_irq_event(ps8622->connector.dev); - - return ret; -} - -static const struct drm_bridge_funcs ps8622_bridge_funcs = { - .pre_enable = ps8622_pre_enable, - .enable = ps8622_enable, - .disable = ps8622_disable, - .post_disable = ps8622_post_disable, - .attach = ps8622_attach, -}; - -static const struct of_device_id ps8622_devices[] = { - {.compatible = "parade,ps8622",}, - {.compatible = "parade,ps8625",}, - {} -}; -MODULE_DEVICE_TABLE(of, ps8622_devices); - -static int ps8622_probe(struct i2c_client *client, - const struct i2c_device_id *id) -{ - struct device *dev = &client->dev; - struct device_node *endpoint, *panel_node; - struct ps8622_bridge *ps8622; - int ret; - - ps8622 = devm_kzalloc(dev, sizeof(*ps8622), GFP_KERNEL); - if (!ps8622) - return -ENOMEM; - - endpoint = of_graph_get_next_endpoint(dev->of_node, NULL); - if (endpoint) { - panel_node = of_graph_get_remote_port_parent(endpoint); - if (panel_node) { - ps8622->panel = of_drm_find_panel(panel_node); - of_node_put(panel_node); - if (!ps8622->panel) - return -EPROBE_DEFER; - } - } - - ps8622->client = client; - - ps8622->v12 = devm_regulator_get(dev, "vdd12"); - if (IS_ERR(ps8622->v12)) { - dev_info(dev, "no 1.2v regulator found for PS8622\n"); - ps8622->v12 = NULL; - } - - ps8622->gpio_slp = devm_gpiod_get(dev, "sleep", GPIOD_OUT_HIGH); - if (IS_ERR(ps8622->gpio_slp)) { - ret = PTR_ERR(ps8622->gpio_slp); - dev_err(dev, "cannot get gpio_slp %d\n", ret); - return ret; - } - - /* - * Assert the reset pin high to avoid the bridge being - * initialized prematurely - */ - ps8622->gpio_rst = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); - if (IS_ERR(ps8622->gpio_rst)) { - ret = PTR_ERR(ps8622->gpio_rst); - dev_err(dev, "cannot get gpio_rst %d\n", ret); - return ret; - } - - ps8622->max_lane_count = id->driver_data; - - if (of_property_read_u32(dev->of_node, "lane-count", - &ps8622->lane_count)) { - ps8622->lane_count = ps8622->max_lane_count; - } else if (ps8622->lane_count > ps8622->max_lane_count) { - dev_info(dev, "lane-count property is too high," - "using max_lane_count\n"); - ps8622->lane_count = ps8622->max_lane_count; - } - - if (!of_find_property(dev->of_node, "use-external-pwm", NULL)) { - ps8622->bl = backlight_device_register("ps8622-backlight", - dev, ps8622, &ps8622_backlight_ops, - NULL); - if (IS_ERR(ps8622->bl)) { - DRM_ERROR("failed to register backlight\n"); - ret = PTR_ERR(ps8622->bl); - ps8622->bl = NULL; - return ret; - } - ps8622->bl->props.max_brightness = PS8622_MAX_BRIGHTNESS; - ps8622->bl->props.brightness = PS8622_MAX_BRIGHTNESS; - } - - ps8622->bridge.funcs = &ps8622_bridge_funcs; - ps8622->bridge.of_node = dev->of_node; - ret = drm_bridge_add(&ps8622->bridge); - if (ret) { - DRM_ERROR("Failed to add bridge\n"); - return ret; - } - - i2c_set_clientdata(client, ps8622); - - return 0; -} - -static int ps8622_remove(struct i2c_client *client) -{ - struct ps8622_bridge *ps8622 = i2c_get_clientdata(client); - - if (ps8622->bl) - backlight_device_unregister(ps8622->bl); - - drm_bridge_remove(&ps8622->bridge); - - return 0; -} - -static const struct i2c_device_id ps8622_i2c_table[] = { - /* Device type, max_lane_count */ - {"ps8622", 1}, - {"ps8625", 2}, - {}, -}; -MODULE_DEVICE_TABLE(i2c, ps8622_i2c_table); - -static struct i2c_driver ps8622_driver = { - .id_table = ps8622_i2c_table, - .probe = ps8622_probe, - .remove = ps8622_remove, - .driver = { - .name = "ps8622", - .owner = THIS_MODULE, - .of_match_table = ps8622_devices, - }, -}; -module_i2c_driver(ps8622_driver); - -MODULE_AUTHOR("Vincent Palatin <vpalatin@chromium.org>"); -MODULE_DESCRIPTION("Parade ps8622/ps8625 eDP-LVDS converter driver"); -MODULE_LICENSE("GPL v2"); |