[linux-block.git] / drivers / gpu / drm / bridge / parade-ps8622.c

// 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/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_bridge.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");
Commit	Line	Data
9c92ab61	1	// SPDX-License-Identifier: GPL-2.0-only
b2ea8772 VP	2	/*
	3	* Parade PS8622 eDP/LVDS bridge driver
	4	*
	5	* Copyright (C) 2014 Google, Inc.
b2ea8772 VP	6	*/
	7
	8	#include <linux/backlight.h>
	9	#include <linux/delay.h>
	10	#include <linux/err.h>
dcd43d64	11	#include <linux/gpio/consumer.h>
b2ea8772 VP	12	#include <linux/i2c.h>
	13	#include <linux/module.h>
	14	#include <linux/of.h>
	15	#include <linux/of_device.h>
b2ea8772 VP	16	#include <linux/pm.h>
b2ea8772 VP	17	#include <linux/regulator/consumer.h>
95b60804	18
191436c4	19	#include <drm/drm_atomic_helper.h>
ee68c743	20	#include <drm/drm_bridge.h>
191436c4	21	#include <drm/drm_crtc.h>
ebc94461	22	#include <drm/drm_of.h>
b2ea8772	23	#include <drm/drm_panel.h>
95b60804	24	#include <drm/drm_print.h>
fcd70cd3	25	#include <drm/drm_probe_helper.h>
b2ea8772 VP	26
	27	/* Brightness scale on the Parade chip */
	28	#define PS8622_MAX_BRIGHTNESS 0xff
	29
	30	/* Timings taken from the version 1.7 datasheet for the PS8622/PS8625 */
	31	#define PS8622_POWER_RISE_T1_MIN_US 10
	32	#define PS8622_POWER_RISE_T1_MAX_US 10000
	33	#define PS8622_RST_HIGH_T2_MIN_US 3000
	34	#define PS8622_RST_HIGH_T2_MAX_US 30000
	35	#define PS8622_PWMO_END_T12_MS 200
	36	#define PS8622_POWER_FALL_T16_MAX_US 10000
	37	#define PS8622_POWER_OFF_T17_MS 500
	38
	39	#if ((PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US) > \
	40	(PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US))
	41	#error "T2.min + T1.max must be less than T2.max + T1.min"
	42	#endif
	43
	44	struct ps8622_bridge {
	45	struct drm_connector connector;
	46	struct i2c_client *client;
	47	struct drm_bridge bridge;
	48	struct drm_panel *panel;
	49	struct regulator *v12;
	50	struct backlight_device *bl;
	51
	52	struct gpio_desc *gpio_slp;
	53	struct gpio_desc *gpio_rst;
	54
	55	u32 max_lane_count;
	56	u32 lane_count;
	57
	58	bool enabled;
	59	};
	60
	61	static inline struct ps8622_bridge *
	62	bridge_to_ps8622(struct drm_bridge *bridge)
	63	{
	64	return container_of(bridge, struct ps8622_bridge, bridge);
	65	}
	66
	67	static inline struct ps8622_bridge *
	68	connector_to_ps8622(struct drm_connector *connector)
	69	{
	70	return container_of(connector, struct ps8622_bridge, connector);
	71	}
	72
	73	static int ps8622_set(struct i2c_client *client, u8 page, u8 reg, u8 val)
	74	{
	75	int ret;
	76	struct i2c_adapter *adap = client->adapter;
	77	struct i2c_msg msg;
	78	u8 data[] = {reg, val};
	79
	80	msg.addr = client->addr + page;
	81	msg.flags = 0;
	82	msg.len = sizeof(data);
	83	msg.buf = data;
	84
	85	ret = i2c_transfer(adap, &msg, 1);
	86	if (ret != 1)
	87	pr_warn("PS8622 I2C write (0x%02x,0x%02x,0x%02x) failed: %d\n",
	88	client->addr + page, reg, val, ret);
	89	return !(ret == 1);
90	}
91
92	static int ps8622_send_config(struct ps8622_bridge *ps8622)
93	{
94	struct i2c_client *cl = ps8622->client;
95	int err = 0;
96
97	/* HPD low */
98	err = ps8622_set(cl, 0x02, 0xa1, 0x01);
99	if (err)
100	goto error;
101
102	/* SW setting: [1:0] SW output 1.2V voltage is lower to 96% */
103	err = ps8622_set(cl, 0x04, 0x14, 0x01);
104	if (err)
105	goto error;
106
107	/* RCO SS setting: [5:4] = b01 0.5%, b10 1%, b11 1.5% */
108	err = ps8622_set(cl, 0x04, 0xe3, 0x20);
109	if (err)
110	goto error;
111
112	/* [7] RCO SS enable */
113	err = ps8622_set(cl, 0x04, 0xe2, 0x80);
114	if (err)
115	goto error;
116
117	/* RPHY Setting
118	* [3:2] CDR tune wait cycle before measure for fine tune
119	* b00: 1us b01: 0.5us b10:2us, b11: 4us
120	*/
121	err = ps8622_set(cl, 0x04, 0x8a, 0x0c);
122	if (err)
123	goto error;
124
125	/* [3] RFD always on */
126	err = ps8622_set(cl, 0x04, 0x89, 0x08);
127	if (err)
128	goto error;
129
130	/* CTN lock in/out: 20000ppm/80000ppm. Lock out 2 times. */
131	err = ps8622_set(cl, 0x04, 0x71, 0x2d);
132	if (err)
133	goto error;
134
135	/* 2.7G CDR settings: NOF=40LSB for HBR CDR setting */
136	err = ps8622_set(cl, 0x04, 0x7d, 0x07);
137	if (err)
138	goto error;
139
140	/* [1:0] Fmin=+4bands */
141	err = ps8622_set(cl, 0x04, 0x7b, 0x00);
142	if (err)
143	goto error;
144
145	/* [7:5] DCO_FTRNG=+-40% */
146	err = ps8622_set(cl, 0x04, 0x7a, 0xfd);
147	if (err)
148	goto error;
149
150	/* 1.62G CDR settings: [5:2]NOF=64LSB [1:0]DCO scale is 2/5 */
151	err = ps8622_set(cl, 0x04, 0xc0, 0x12);
152	if (err)
153	goto error;
154
155	/* Gitune=-37% */
156	err = ps8622_set(cl, 0x04, 0xc1, 0x92);
157	if (err)
158	goto error;
159
160	/* Fbstep=100% */
161	err = ps8622_set(cl, 0x04, 0xc2, 0x1c);
162	if (err)
163	goto error;
164
165	/* [7] LOS signal disable */
166	err = ps8622_set(cl, 0x04, 0x32, 0x80);
167	if (err)
168	goto error;
169
170	/* RPIO Setting: [7:4] LVDS driver bias current : 75% (250mV swing) */
171	err = ps8622_set(cl, 0x04, 0x00, 0xb0);
172	if (err)
173	goto error;
174
175	/* [7:6] Right-bar GPIO output strength is 8mA */
176	err = ps8622_set(cl, 0x04, 0x15, 0x40);
177	if (err)
178	goto error;
179
180	/* EQ Training State Machine Setting, RCO calibration start */
181	err = ps8622_set(cl, 0x04, 0x54, 0x10);
182	if (err)
183	goto error;
184
185	/* Logic, needs more than 10 I2C command */
186	/* [4:0] MAX_LANE_COUNT set to max supported lanes */
187	err = ps8622_set(cl, 0x01, 0x02, 0x80 \| ps8622->max_lane_count);
188	if (err)
189	goto error;
190
191	/* [4:0] LANE_COUNT_SET set to chosen lane count */
192	err = ps8622_set(cl, 0x01, 0x21, 0x80 \| ps8622->lane_count);
193	if (err)
194	goto error;
195
196	err = ps8622_set(cl, 0x00, 0x52, 0x20);
197	if (err)
198	goto error;
199
200	/* HPD CP toggle enable */
201	err = ps8622_set(cl, 0x00, 0xf1, 0x03);
202	if (err)
203	goto error;
204
205	err = ps8622_set(cl, 0x00, 0x62, 0x41);
206	if (err)
207	goto error;
208
209	/* Counter number, add 1ms counter delay */
210	err = ps8622_set(cl, 0x00, 0xf6, 0x01);
211	if (err)
212	goto error;
213
214	/* [6]PWM function control by DPCD0040f[7], default is PWM block */
215	err = ps8622_set(cl, 0x00, 0x77, 0x06);
216	if (err)
217	goto error;
218
219	/* 04h Adjust VTotal toleranceto fix the 30Hz no display issue */
220	err = ps8622_set(cl, 0x00, 0x4c, 0x04);
221	if (err)
222	goto error;
223
224	/* DPCD00400='h00, Parade OUI ='h001cf8 */
225	err = ps8622_set(cl, 0x01, 0xc0, 0x00);
226	if (err)
227	goto error;
228
229	/* DPCD00401='h1c */
230	err = ps8622_set(cl, 0x01, 0xc1, 0x1c);
231	if (err)
232	goto error;
233
234	/* DPCD00402='hf8 */
235	err = ps8622_set(cl, 0x01, 0xc2, 0xf8);
236	if (err)
237	goto error;
238
239	/* DPCD403~408 = ASCII code, D2SLV5='h4432534c5635 */
240	err = ps8622_set(cl, 0x01, 0xc3, 0x44);
241	if (err)
242	goto error;
243
244	/* DPCD404 */
245	err = ps8622_set(cl, 0x01, 0xc4, 0x32);
246	if (err)
247	goto error;
248
249	/* DPCD405 */
250	err = ps8622_set(cl, 0x01, 0xc5, 0x53);
251	if (err)
252	goto error;
253
254	/* DPCD406 */
255	err = ps8622_set(cl, 0x01, 0xc6, 0x4c);
256	if (err)
257	goto error;
258
259	/* DPCD407 */
260	err = ps8622_set(cl, 0x01, 0xc7, 0x56);
261	if (err)
262	goto error;
263
264	/* DPCD408 */
265	err = ps8622_set(cl, 0x01, 0xc8, 0x35);
266	if (err)
267	goto error;
268
269	/* DPCD40A, Initial Code major revision '01' */
270	err = ps8622_set(cl, 0x01, 0xca, 0x01);
271	if (err)
272	goto error;
273
274	/* DPCD40B, Initial Code minor revision '05' */
275	err = ps8622_set(cl, 0x01, 0xcb, 0x05);
276	if (err)
277	goto error;
278
279
280	if (ps8622->bl) {
281	/* DPCD720, internal PWM */
282	err = ps8622_set(cl, 0x01, 0xa5, 0xa0);
283	if (err)
284	goto error;
285
286	/* FFh for 100% brightness, 0h for 0% brightness */
287	err = ps8622_set(cl, 0x01, 0xa7,
288	ps8622->bl->props.brightness);
289	if (err)
290	goto error;
291	} else {
292	/* DPCD720, external PWM */
293	err = ps8622_set(cl, 0x01, 0xa5, 0x80);
294	if (err)
295	goto error;
296	}
297
298	/* Set LVDS output as 6bit-VESA mapping, single LVDS channel */
299	err = ps8622_set(cl, 0x01, 0xcc, 0x13);
300	if (err)
301	goto error;
302
303	/* Enable SSC set by register */
304	err = ps8622_set(cl, 0x02, 0xb1, 0x20);
305	if (err)
306	goto error;
307
308	/* Set SSC enabled and +/-1% central spreading */
309	err = ps8622_set(cl, 0x04, 0x10, 0x16);
310	if (err)
311	goto error;
312
313	/* Logic end */
314	/* MPU Clock source: LC => RCO */
315	err = ps8622_set(cl, 0x04, 0x59, 0x60);
316	if (err)
317	goto error;
318
319	/* LC -> RCO */
320	err = ps8622_set(cl, 0x04, 0x54, 0x14);
321	if (err)
322	goto error;
323
324	/* HPD high */
325	err = ps8622_set(cl, 0x02, 0xa1, 0x91);
326
327	error:
328	return err ? -EIO : 0;
329	}
330
331	static int ps8622_backlight_update(struct backlight_device *bl)
332	{
333	struct ps8622_bridge *ps8622 = dev_get_drvdata(&bl->dev);
334	int ret, brightness = bl->props.brightness;
335
336	if (bl->props.power != FB_BLANK_UNBLANK \|\|
337	bl->props.state & (BL_CORE_SUSPENDED \| BL_CORE_FBBLANK))
338	brightness = 0;
339
340	if (!ps8622->enabled)
341	return -EINVAL;
342
343	ret = ps8622_set(ps8622->client, 0x01, 0xa7, brightness);
344
345	return ret;
346	}
347
348	static const struct backlight_ops ps8622_backlight_ops = {
349	.update_status = ps8622_backlight_update,
350	};
351
352	static void ps8622_pre_enable(struct drm_bridge *bridge)
353	{
354	struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
355	int ret;
356
357	if (ps8622->enabled)
358	return;
359
360	gpiod_set_value(ps8622->gpio_rst, 0);
361
362	if (ps8622->v12) {
363	ret = regulator_enable(ps8622->v12);
364	if (ret)
365	DRM_ERROR("fails to enable ps8622->v12");
366	}
367
368	if (drm_panel_prepare(ps8622->panel)) {
369	DRM_ERROR("failed to prepare panel\n");
370	return;
371	}
372
373	gpiod_set_value(ps8622->gpio_slp, 1);
374
375	/*
376	* T1 is the range of time that it takes for the power to rise after we
377	* enable the lcd/ps8622 fet. T2 is the range of time in which the
378	* data sheet specifies we should deassert the reset pin.
379	*
380	* If it takes T1.max for the power to rise, we need to wait atleast
381	* T2.min before deasserting the reset pin. If it takes T1.min for the
382	* power to rise, we need to wait at most T2.max before deasserting the
383	* reset pin.
384	*/
385	usleep_range(PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US,
386	PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US);
387
388	gpiod_set_value(ps8622->gpio_rst, 1);
389
390	/* wait 20ms after RST high */
391	usleep_range(20000, 30000);
392
393	ret = ps8622_send_config(ps8622);
394	if (ret) {
395	DRM_ERROR("Failed to send config to bridge (%d)\n", ret);
396	return;
397	}
398
399	ps8622->enabled = true;
400	}
401
402	static void ps8622_enable(struct drm_bridge *bridge)
403	{
404	struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
405
406	if (drm_panel_enable(ps8622->panel)) {
407	DRM_ERROR("failed to enable panel\n");
408	return;
409	}
410	}
411
412	static void ps8622_disable(struct drm_bridge *bridge)
413	{
414	struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
415
416	if (drm_panel_disable(ps8622->panel)) {
417	DRM_ERROR("failed to disable panel\n");
418	return;
419	}
420	msleep(PS8622_PWMO_END_T12_MS);
421	}
422
423	static void ps8622_post_disable(struct drm_bridge *bridge)
424	{
425	struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
426
427	if (!ps8622->enabled)
428	return;
429
430	ps8622->enabled = false;
431
432	/*
433	* This doesn't matter if the regulators are turned off, but something
434	* else might keep them on. In that case, we want to assert the slp gpio
435	* to lower power.
436	*/
437	gpiod_set_value(ps8622->gpio_slp, 0);
438
439	if (drm_panel_unprepare(ps8622->panel)) {
440	DRM_ERROR("failed to unprepare panel\n");
441	return;
442	}
443
444	if (ps8622->v12)
445	regulator_disable(ps8622->v12);
446
447	/*
448	* Sleep for at least the amount of time that it takes the power rail to
449	* fall to prevent asserting the rst gpio from doing anything.
450	*/
451	usleep_range(PS8622_POWER_FALL_T16_MAX_US,
452	2 * PS8622_POWER_FALL_T16_MAX_US);
453	gpiod_set_value(ps8622->gpio_rst, 0);
454
455	msleep(PS8622_POWER_OFF_T17_MS);
456	}
457
458	static int ps8622_get_modes(struct drm_connector *connector)
459	{
460	struct ps8622_bridge *ps8622;
461
462	ps8622 = connector_to_ps8622(connector);
463
464	return drm_panel_get_modes(ps8622->panel);
465	}
466
b2ea8772 VP	467	static const struct drm_connector_helper_funcs ps8622_connector_helper_funcs = {
b2ea8772 VP	468	.get_modes = ps8622_get_modes,
b2ea8772 VP	469	};
b2ea8772 VP	470
b2ea8772	471	static const struct drm_connector_funcs ps8622_connector_funcs = {
b2ea8772	472	.fill_modes = drm_helper_probe_single_connector_modes,
bf3b123e	473	.destroy = drm_connector_cleanup,
4ea9526b GP	474	.reset = drm_atomic_helper_connector_reset,
	475	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	476	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
b2ea8772 VP	477	};
b2ea8772 VP	478
8a7d56b3	479	static int ps8622_attach(struct drm_bridge *bridge)
b2ea8772 VP	480	{
	481	struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
	482	int ret;
	483
	484	if (!bridge->encoder) {
	485	DRM_ERROR("Parent encoder object not found");
	486	return -ENODEV;
	487	}
	488
	489	ps8622->connector.polled = DRM_CONNECTOR_POLL_HPD;
	490	ret = drm_connector_init(bridge->dev, &ps8622->connector,
	491	&ps8622_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
	492	if (ret) {
	493	DRM_ERROR("Failed to initialize connector with drm\n");
	494	return ret;
	495	}
	496	drm_connector_helper_add(&ps8622->connector,
	497	&ps8622_connector_helper_funcs);
	498	drm_connector_register(&ps8622->connector);
cde4c44d	499	drm_connector_attach_encoder(&ps8622->connector,
b2ea8772 VP	500	bridge->encoder);
	501
	502	if (ps8622->panel)
	503	drm_panel_attach(ps8622->panel, &ps8622->connector);
	504
	505	drm_helper_hpd_irq_event(ps8622->connector.dev);
	506
	507	return ret;
	508	}
	509
	510	static const struct drm_bridge_funcs ps8622_bridge_funcs = {
	511	.pre_enable = ps8622_pre_enable,
	512	.enable = ps8622_enable,
	513	.disable = ps8622_disable,
	514	.post_disable = ps8622_post_disable,
	515	.attach = ps8622_attach,
	516	};
	517
	518	static const struct of_device_id ps8622_devices[] = {
	519	{.compatible = "parade,ps8622",},
	520	{.compatible = "parade,ps8625",},
	521	{}
	522	};
	523	MODULE_DEVICE_TABLE(of, ps8622_devices);
	524
	525	static int ps8622_probe(struct i2c_client *client,
	526	const struct i2c_device_id *id)
	527	{
	528	struct device *dev = &client->dev;
b2ea8772 VP	529	struct ps8622_bridge *ps8622;
	530	int ret;
	531
	532	ps8622 = devm_kzalloc(dev, sizeof(*ps8622), GFP_KERNEL);
	533	if (!ps8622)
	534	return -ENOMEM;
	535
ebc94461 RH	536	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ps8622->panel, NULL);
	537	if (ret)
	538	return ret;
b2ea8772 VP	539
	540	ps8622->client = client;
	541
	542	ps8622->v12 = devm_regulator_get(dev, "vdd12");
	543	if (IS_ERR(ps8622->v12)) {
	544	dev_info(dev, "no 1.2v regulator found for PS8622\n");
	545	ps8622->v12 = NULL;
	546	}
	547
a92bf307	548	ps8622->gpio_slp = devm_gpiod_get(dev, "sleep", GPIOD_OUT_HIGH);
b2ea8772 VP	549	if (IS_ERR(ps8622->gpio_slp)) {
	550	ret = PTR_ERR(ps8622->gpio_slp);
	551	dev_err(dev, "cannot get gpio_slp %d\n", ret);
	552	return ret;
	553	}
b2ea8772	554
b2ea8772 VP	555	/*
	556	* Assert the reset pin high to avoid the bridge being
	557	* initialized prematurely
	558	*/
a92bf307 UKK	559	ps8622->gpio_rst = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
	560	if (IS_ERR(ps8622->gpio_rst)) {
	561	ret = PTR_ERR(ps8622->gpio_rst);
	562	dev_err(dev, "cannot get gpio_rst %d\n", ret);
b2ea8772 VP	563	return ret;
	564	}
	565
	566	ps8622->max_lane_count = id->driver_data;
	567
	568	if (of_property_read_u32(dev->of_node, "lane-count",
	569	&ps8622->lane_count)) {
	570	ps8622->lane_count = ps8622->max_lane_count;
	571	} else if (ps8622->lane_count > ps8622->max_lane_count) {
	572	dev_info(dev, "lane-count property is too high,"
	573	"using max_lane_count\n");
	574	ps8622->lane_count = ps8622->max_lane_count;
	575	}
	576
	577	if (!of_find_property(dev->of_node, "use-external-pwm", NULL)) {
	578	ps8622->bl = backlight_device_register("ps8622-backlight",
	579	dev, ps8622, &ps8622_backlight_ops,
	580	NULL);
	581	if (IS_ERR(ps8622->bl)) {
	582	DRM_ERROR("failed to register backlight\n");
	583	ret = PTR_ERR(ps8622->bl);
	584	ps8622->bl = NULL;
	585	return ret;
	586	}
	587	ps8622->bl->props.max_brightness = PS8622_MAX_BRIGHTNESS;
	588	ps8622->bl->props.brightness = PS8622_MAX_BRIGHTNESS;
	589	}
	590
	591	ps8622->bridge.funcs = &ps8622_bridge_funcs;
	592	ps8622->bridge.of_node = dev->of_node;
d0ceb3ec	593	drm_bridge_add(&ps8622->bridge);
b2ea8772 VP	594
	595	i2c_set_clientdata(client, ps8622);
	596
	597	return 0;
	598	}
	599
	600	static int ps8622_remove(struct i2c_client *client)
	601	{
	602	struct ps8622_bridge *ps8622 = i2c_get_clientdata(client);
	603
4cf090e1	604	backlight_device_unregister(ps8622->bl);
b2ea8772 VP	605	drm_bridge_remove(&ps8622->bridge);
	606
	607	return 0;
	608	}
	609
	610	static const struct i2c_device_id ps8622_i2c_table[] = {
	611	/* Device type, max_lane_count */
	612	{"ps8622", 1},
	613	{"ps8625", 2},
	614	{},
	615	};
	616	MODULE_DEVICE_TABLE(i2c, ps8622_i2c_table);
	617
8a7d56b3	618	static struct i2c_driver ps8622_driver = {
b2ea8772 VP	619	.id_table = ps8622_i2c_table,
	620	.probe = ps8622_probe,
	621	.remove = ps8622_remove,
	622	.driver = {
	623	.name = "ps8622",
b2ea8772 VP	624	.of_match_table = ps8622_devices,
	625	},
	626	};
	627	module_i2c_driver(ps8622_driver);
	628
	629	MODULE_AUTHOR("Vincent Palatin <vpalatin@chromium.org>");
	630	MODULE_DESCRIPTION("Parade ps8622/ps8625 eDP-LVDS converter driver");
	631	MODULE_LICENSE("GPL v2");