| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Parade PS8622 eDP/LVDS bridge driver |
| * |
| * Copyright (C) 2014 Google, Inc. |
| */ |
| |
| #include <linux/backlight.h> |
| #include <linux/delay.h> |
| #include <linux/err.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/pm.h> |
| #include <linux/regulator/consumer.h> |
| |
| #include <drm/drm_atomic_helper.h> |
| #include <drm/drm_crtc.h> |
| #include <drm/drm_of.h> |
| #include <drm/drm_panel.h> |
| #include <drm/drm_print.h> |
| #include <drm/drm_probe_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 const struct drm_connector_helper_funcs ps8622_connector_helper_funcs = { |
| .get_modes = ps8622_get_modes, |
| }; |
| |
| static const struct drm_connector_funcs ps8622_connector_funcs = { |
| .fill_modes = drm_helper_probe_single_connector_modes, |
| .destroy = drm_connector_cleanup, |
| .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_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 ps8622_bridge *ps8622; |
| int ret; |
| |
| ps8622 = devm_kzalloc(dev, sizeof(*ps8622), GFP_KERNEL); |
| if (!ps8622) |
| return -ENOMEM; |
| |
| ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ps8622->panel, NULL); |
| if (ret) |
| return ret; |
| |
| 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; |
| drm_bridge_add(&ps8622->bridge); |
| |
| i2c_set_clientdata(client, ps8622); |
| |
| return 0; |
| } |
| |
| static int ps8622_remove(struct i2c_client *client) |
| { |
| struct ps8622_bridge *ps8622 = i2c_get_clientdata(client); |
| |
| 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", |
| .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"); |