From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- drivers/gpu/drm/bridge/parade-ps8622.c | 552 +++++++++++++++++++++++++++++++++ 1 file changed, 552 insertions(+) create mode 100644 drivers/gpu/drm/bridge/parade-ps8622.c (limited to 'drivers/gpu/drm/bridge/parade-ps8622.c') diff --git a/drivers/gpu/drm/bridge/parade-ps8622.c b/drivers/gpu/drm/bridge/parade-ps8622.c new file mode 100644 index 000000000..309de8028 --- /dev/null +++ b/drivers/gpu/drm/bridge/parade-ps8622.c @@ -0,0 +1,552 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Parade PS8622 eDP/LVDS bridge driver + * + * Copyright (C) 2014 Google, Inc. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include + +/* 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 i2c_client *client; + struct drm_bridge bridge; + struct drm_bridge *panel_bridge; + 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 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 = backlight_get_brightness(bl); + + 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"); + } + + 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_disable(struct drm_bridge *bridge) +{ + /* Delay after panel is disabled */ + 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 (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_attach(struct drm_bridge *bridge, + enum drm_bridge_attach_flags flags) +{ + struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); + + return drm_bridge_attach(ps8622->bridge.encoder, ps8622->panel_bridge, + &ps8622->bridge, flags); +} + +static const struct drm_bridge_funcs ps8622_bridge_funcs = { + .pre_enable = ps8622_pre_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; + struct drm_bridge *panel_bridge; + int ret; + + ps8622 = devm_kzalloc(dev, sizeof(*ps8622), GFP_KERNEL); + if (!ps8622) + return -ENOMEM; + + panel_bridge = devm_drm_of_get_bridge(dev, dev->of_node, 0, 0); + if (IS_ERR(panel_bridge)) + return PTR_ERR(panel_bridge); + + ps8622->panel_bridge = panel_bridge; + 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.type = DRM_MODE_CONNECTOR_LVDS; + ps8622->bridge.of_node = dev->of_node; + drm_bridge_add(&ps8622->bridge); + + i2c_set_clientdata(client, ps8622); + + return 0; +} + +static void ps8622_remove(struct i2c_client *client) +{ + struct ps8622_bridge *ps8622 = i2c_get_clientdata(client); + + backlight_device_unregister(ps8622->bl); + drm_bridge_remove(&ps8622->bridge); +} + +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 "); +MODULE_DESCRIPTION("Parade ps8622/ps8625 eDP-LVDS converter driver"); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3