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

/*
 * 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 const struct drm_connector_helper_funcs ps8622_connector_helper_funcs = {
	.get_modes = ps8622_get_modes,
};

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",
		.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
b2ea8772 VP	1	/*
	2	* Parade PS8622 eDP/LVDS bridge driver
	3	*
	4	* Copyright (C) 2014 Google, Inc.
	5	*
	6	* This software is licensed under the terms of the GNU General Public
	7	* License version 2, as published by the Free Software Foundation, and
	8	* may be copied, distributed, and modified under those terms.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*/
	15
	16	#include <linux/backlight.h>
	17	#include <linux/delay.h>
	18	#include <linux/err.h>
	19	#include <linux/fb.h>
	20	#include <linux/gpio.h>
dcd43d64	21	#include <linux/gpio/consumer.h>
b2ea8772 VP	22	#include <linux/i2c.h>
	23	#include <linux/module.h>
	24	#include <linux/of.h>
	25	#include <linux/of_device.h>
	26	#include <linux/of_graph.h>
	27	#include <linux/pm.h>
	28	#include <linux/regulator/consumer.h>
	29
	30	#include <drm/drm_panel.h>
	31
	32	#include "drmP.h"
	33	#include "drm_crtc.h"
	34	#include "drm_crtc_helper.h"
4ea9526b	35	#include "drm_atomic_helper.h"
b2ea8772 VP	36
	37	/* Brightness scale on the Parade chip */
	38	#define PS8622_MAX_BRIGHTNESS 0xff
	39
	40	/* Timings taken from the version 1.7 datasheet for the PS8622/PS8625 */
	41	#define PS8622_POWER_RISE_T1_MIN_US 10
	42	#define PS8622_POWER_RISE_T1_MAX_US 10000
	43	#define PS8622_RST_HIGH_T2_MIN_US 3000
	44	#define PS8622_RST_HIGH_T2_MAX_US 30000
	45	#define PS8622_PWMO_END_T12_MS 200
	46	#define PS8622_POWER_FALL_T16_MAX_US 10000
	47	#define PS8622_POWER_OFF_T17_MS 500
	48
	49	#if ((PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US) > \
	50	(PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US))
	51	#error "T2.min + T1.max must be less than T2.max + T1.min"
	52	#endif
	53
	54	struct ps8622_bridge {
	55	struct drm_connector connector;
	56	struct i2c_client *client;
	57	struct drm_bridge bridge;
	58	struct drm_panel *panel;
	59	struct regulator *v12;
	60	struct backlight_device *bl;
	61
	62	struct gpio_desc *gpio_slp;
	63	struct gpio_desc *gpio_rst;
	64
	65	u32 max_lane_count;
	66	u32 lane_count;
	67
	68	bool enabled;
	69	};
	70
	71	static inline struct ps8622_bridge *
	72	bridge_to_ps8622(struct drm_bridge *bridge)
	73	{
	74	return container_of(bridge, struct ps8622_bridge, bridge);
	75	}
	76
	77	static inline struct ps8622_bridge *
	78	connector_to_ps8622(struct drm_connector *connector)
	79	{
	80	return container_of(connector, struct ps8622_bridge, connector);
	81	}
	82
	83	static int ps8622_set(struct i2c_client *client, u8 page, u8 reg, u8 val)
	84	{
	85	int ret;
	86	struct i2c_adapter *adap = client->adapter;
	87	struct i2c_msg msg;
	88	u8 data[] = {reg, val};
	89
	90	msg.addr = client->addr + page;
	91	msg.flags = 0;
	92	msg.len = sizeof(data);
	93	msg.buf = data;
	94
	95	ret = i2c_transfer(adap, &msg, 1);
	96	if (ret != 1)
	97	pr_warn("PS8622 I2C write (0x%02x,0x%02x,0x%02x) failed: %d\n",
	98	client->addr + page, reg, val, ret);
	99	return !(ret == 1);
100	}
101
102	static int ps8622_send_config(struct ps8622_bridge *ps8622)
103	{
104	struct i2c_client *cl = ps8622->client;
105	int err = 0;
106
107	/* HPD low */
108	err = ps8622_set(cl, 0x02, 0xa1, 0x01);
109	if (err)
110	goto error;
111
112	/* SW setting: [1:0] SW output 1.2V voltage is lower to 96% */
113	err = ps8622_set(cl, 0x04, 0x14, 0x01);
114	if (err)
115	goto error;
116
117	/* RCO SS setting: [5:4] = b01 0.5%, b10 1%, b11 1.5% */
118	err = ps8622_set(cl, 0x04, 0xe3, 0x20);
119	if (err)
120	goto error;
121
122	/* [7] RCO SS enable */
123	err = ps8622_set(cl, 0x04, 0xe2, 0x80);
124	if (err)
125	goto error;
126
127	/* RPHY Setting
128	* [3:2] CDR tune wait cycle before measure for fine tune
129	* b00: 1us b01: 0.5us b10:2us, b11: 4us
130	*/
131	err = ps8622_set(cl, 0x04, 0x8a, 0x0c);
132	if (err)
133	goto error;
134
135	/* [3] RFD always on */
136	err = ps8622_set(cl, 0x04, 0x89, 0x08);
137	if (err)
138	goto error;
139
140	/* CTN lock in/out: 20000ppm/80000ppm. Lock out 2 times. */
141	err = ps8622_set(cl, 0x04, 0x71, 0x2d);
142	if (err)
143	goto error;
144
145	/* 2.7G CDR settings: NOF=40LSB for HBR CDR setting */
146	err = ps8622_set(cl, 0x04, 0x7d, 0x07);
147	if (err)
148	goto error;
149
150	/* [1:0] Fmin=+4bands */
151	err = ps8622_set(cl, 0x04, 0x7b, 0x00);
152	if (err)
153	goto error;
154
155	/* [7:5] DCO_FTRNG=+-40% */
156	err = ps8622_set(cl, 0x04, 0x7a, 0xfd);
157	if (err)
158	goto error;
159
160	/* 1.62G CDR settings: [5:2]NOF=64LSB [1:0]DCO scale is 2/5 */
161	err = ps8622_set(cl, 0x04, 0xc0, 0x12);
162	if (err)
163	goto error;
164
165	/* Gitune=-37% */
166	err = ps8622_set(cl, 0x04, 0xc1, 0x92);
167	if (err)
168	goto error;
169
170	/* Fbstep=100% */
171	err = ps8622_set(cl, 0x04, 0xc2, 0x1c);
172	if (err)
173	goto error;
174
175	/* [7] LOS signal disable */
176	err = ps8622_set(cl, 0x04, 0x32, 0x80);
177	if (err)
178	goto error;
179
180	/* RPIO Setting: [7:4] LVDS driver bias current : 75% (250mV swing) */
181	err = ps8622_set(cl, 0x04, 0x00, 0xb0);
182	if (err)
183	goto error;
184
185	/* [7:6] Right-bar GPIO output strength is 8mA */
186	err = ps8622_set(cl, 0x04, 0x15, 0x40);
187	if (err)
188	goto error;
189
190	/* EQ Training State Machine Setting, RCO calibration start */
191	err = ps8622_set(cl, 0x04, 0x54, 0x10);
192	if (err)
193	goto error;
194
195	/* Logic, needs more than 10 I2C command */
196	/* [4:0] MAX_LANE_COUNT set to max supported lanes */
197	err = ps8622_set(cl, 0x01, 0x02, 0x80 \| ps8622->max_lane_count);
198	if (err)
199	goto error;
200
201	/* [4:0] LANE_COUNT_SET set to chosen lane count */
202	err = ps8622_set(cl, 0x01, 0x21, 0x80 \| ps8622->lane_count);
203	if (err)
204	goto error;
205
206	err = ps8622_set(cl, 0x00, 0x52, 0x20);
207	if (err)
208	goto error;
209
210	/* HPD CP toggle enable */
211	err = ps8622_set(cl, 0x00, 0xf1, 0x03);
212	if (err)
213	goto error;
214
215	err = ps8622_set(cl, 0x00, 0x62, 0x41);
216	if (err)
217	goto error;
218
219	/* Counter number, add 1ms counter delay */
220	err = ps8622_set(cl, 0x00, 0xf6, 0x01);
221	if (err)
222	goto error;
223
224	/* [6]PWM function control by DPCD0040f[7], default is PWM block */
225	err = ps8622_set(cl, 0x00, 0x77, 0x06);
226	if (err)
227	goto error;
228
229	/* 04h Adjust VTotal toleranceto fix the 30Hz no display issue */
230	err = ps8622_set(cl, 0x00, 0x4c, 0x04);
231	if (err)
232	goto error;
233
234	/* DPCD00400='h00, Parade OUI ='h001cf8 */
235	err = ps8622_set(cl, 0x01, 0xc0, 0x00);
236	if (err)
237	goto error;
238
239	/* DPCD00401='h1c */
240	err = ps8622_set(cl, 0x01, 0xc1, 0x1c);
241	if (err)
242	goto error;
243
244	/* DPCD00402='hf8 */
245	err = ps8622_set(cl, 0x01, 0xc2, 0xf8);
246	if (err)
247	goto error;
248
249	/* DPCD403~408 = ASCII code, D2SLV5='h4432534c5635 */
250	err = ps8622_set(cl, 0x01, 0xc3, 0x44);
251	if (err)
252	goto error;
253
254	/* DPCD404 */
255	err = ps8622_set(cl, 0x01, 0xc4, 0x32);
256	if (err)
257	goto error;
258
259	/* DPCD405 */
260	err = ps8622_set(cl, 0x01, 0xc5, 0x53);
261	if (err)
262	goto error;
263
264	/* DPCD406 */
265	err = ps8622_set(cl, 0x01, 0xc6, 0x4c);
266	if (err)
267	goto error;
268
269	/* DPCD407 */
270	err = ps8622_set(cl, 0x01, 0xc7, 0x56);
271	if (err)
272	goto error;
273
274	/* DPCD408 */
275	err = ps8622_set(cl, 0x01, 0xc8, 0x35);
276	if (err)
277	goto error;
278
279	/* DPCD40A, Initial Code major revision '01' */
280	err = ps8622_set(cl, 0x01, 0xca, 0x01);
281	if (err)
282	goto error;
283
284	/* DPCD40B, Initial Code minor revision '05' */
285	err = ps8622_set(cl, 0x01, 0xcb, 0x05);
286	if (err)
287	goto error;
288
289
290	if (ps8622->bl) {
291	/* DPCD720, internal PWM */
292	err = ps8622_set(cl, 0x01, 0xa5, 0xa0);
293	if (err)
294	goto error;
295
296	/* FFh for 100% brightness, 0h for 0% brightness */
297	err = ps8622_set(cl, 0x01, 0xa7,
298	ps8622->bl->props.brightness);
299	if (err)
300	goto error;
301	} else {
302	/* DPCD720, external PWM */
303	err = ps8622_set(cl, 0x01, 0xa5, 0x80);
304	if (err)
305	goto error;
306	}
307
308	/* Set LVDS output as 6bit-VESA mapping, single LVDS channel */
309	err = ps8622_set(cl, 0x01, 0xcc, 0x13);
310	if (err)
311	goto error;
312
313	/* Enable SSC set by register */
314	err = ps8622_set(cl, 0x02, 0xb1, 0x20);
315	if (err)
316	goto error;
317
318	/* Set SSC enabled and +/-1% central spreading */
319	err = ps8622_set(cl, 0x04, 0x10, 0x16);
320	if (err)
321	goto error;
322
323	/* Logic end */
324	/* MPU Clock source: LC => RCO */
325	err = ps8622_set(cl, 0x04, 0x59, 0x60);
326	if (err)
327	goto error;
328
329	/* LC -> RCO */
330	err = ps8622_set(cl, 0x04, 0x54, 0x14);
331	if (err)
332	goto error;
333
334	/* HPD high */
335	err = ps8622_set(cl, 0x02, 0xa1, 0x91);
336
337	error:
338	return err ? -EIO : 0;
339	}
340
341	static int ps8622_backlight_update(struct backlight_device *bl)
342	{
343	struct ps8622_bridge *ps8622 = dev_get_drvdata(&bl->dev);
344	int ret, brightness = bl->props.brightness;
345
346	if (bl->props.power != FB_BLANK_UNBLANK \|\|
347	bl->props.state & (BL_CORE_SUSPENDED \| BL_CORE_FBBLANK))
348	brightness = 0;
349
350	if (!ps8622->enabled)
351	return -EINVAL;
352
353	ret = ps8622_set(ps8622->client, 0x01, 0xa7, brightness);
354
355	return ret;
356	}
357
358	static const struct backlight_ops ps8622_backlight_ops = {
359	.update_status = ps8622_backlight_update,
360	};
361
362	static void ps8622_pre_enable(struct drm_bridge *bridge)
363	{
364	struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
365	int ret;
366
367	if (ps8622->enabled)
368	return;
369
370	gpiod_set_value(ps8622->gpio_rst, 0);
371
372	if (ps8622->v12) {
373	ret = regulator_enable(ps8622->v12);
374	if (ret)
375	DRM_ERROR("fails to enable ps8622->v12");
376	}
377
378	if (drm_panel_prepare(ps8622->panel)) {
379	DRM_ERROR("failed to prepare panel\n");
380	return;
381	}
382
383	gpiod_set_value(ps8622->gpio_slp, 1);
384
385	/*
386	* T1 is the range of time that it takes for the power to rise after we
387	* enable the lcd/ps8622 fet. T2 is the range of time in which the
388	* data sheet specifies we should deassert the reset pin.
389	*
390	* If it takes T1.max for the power to rise, we need to wait atleast
391	* T2.min before deasserting the reset pin. If it takes T1.min for the
392	* power to rise, we need to wait at most T2.max before deasserting the
393	* reset pin.
394	*/
395	usleep_range(PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US,
396	PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US);
397
398	gpiod_set_value(ps8622->gpio_rst, 1);
399
400	/* wait 20ms after RST high */
401	usleep_range(20000, 30000);
402
403	ret = ps8622_send_config(ps8622);
404	if (ret) {
405	DRM_ERROR("Failed to send config to bridge (%d)\n", ret);
406	return;
407	}
408
409	ps8622->enabled = true;
410	}
411
412	static void ps8622_enable(struct drm_bridge *bridge)
413	{
414	struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
415
416	if (drm_panel_enable(ps8622->panel)) {
417	DRM_ERROR("failed to enable panel\n");
418	return;
419	}
420	}
421
422	static void ps8622_disable(struct drm_bridge *bridge)
423	{
424	struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
425
426	if (drm_panel_disable(ps8622->panel)) {
427	DRM_ERROR("failed to disable panel\n");
428	return;
429	}
430	msleep(PS8622_PWMO_END_T12_MS);
431	}
432
433	static void ps8622_post_disable(struct drm_bridge *bridge)
434	{
435	struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
436
437	if (!ps8622->enabled)
438	return;
439
440	ps8622->enabled = false;
441
442	/*
443	* This doesn't matter if the regulators are turned off, but something
444	* else might keep them on. In that case, we want to assert the slp gpio
445	* to lower power.
446	*/
447	gpiod_set_value(ps8622->gpio_slp, 0);
448
449	if (drm_panel_unprepare(ps8622->panel)) {
450	DRM_ERROR("failed to unprepare panel\n");
451	return;
452	}
453
454	if (ps8622->v12)
455	regulator_disable(ps8622->v12);
456
457	/*
458	* Sleep for at least the amount of time that it takes the power rail to
459	* fall to prevent asserting the rst gpio from doing anything.
460	*/
461	usleep_range(PS8622_POWER_FALL_T16_MAX_US,
462	2 * PS8622_POWER_FALL_T16_MAX_US);
463	gpiod_set_value(ps8622->gpio_rst, 0);
464
465	msleep(PS8622_POWER_OFF_T17_MS);
466	}
467
468	static int ps8622_get_modes(struct drm_connector *connector)
469	{
470	struct ps8622_bridge *ps8622;
471
472	ps8622 = connector_to_ps8622(connector);
473
474	return drm_panel_get_modes(ps8622->panel);
475	}
476
b2ea8772 VP	477	static const struct drm_connector_helper_funcs ps8622_connector_helper_funcs = {
b2ea8772 VP	478	.get_modes = ps8622_get_modes,
b2ea8772 VP	479	};
	480
	481	static enum drm_connector_status ps8622_detect(struct drm_connector *connector,
	482	bool force)
	483	{
	484	return connector_status_connected;
	485	}
	486
	487	static void ps8622_connector_destroy(struct drm_connector *connector)
	488	{
	489	drm_connector_cleanup(connector);
	490	}
	491
	492	static const struct drm_connector_funcs ps8622_connector_funcs = {
63498e30	493	.dpms = drm_atomic_helper_connector_dpms,
b2ea8772 VP	494	.fill_modes = drm_helper_probe_single_connector_modes,
	495	.detect = ps8622_detect,
	496	.destroy = ps8622_connector_destroy,
4ea9526b GP	497	.reset = drm_atomic_helper_connector_reset,
	498	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	499	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
b2ea8772 VP	500	};
b2ea8772 VP	501
8a7d56b3	502	static int ps8622_attach(struct drm_bridge *bridge)
b2ea8772 VP	503	{
	504	struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
	505	int ret;
	506
	507	if (!bridge->encoder) {
	508	DRM_ERROR("Parent encoder object not found");
	509	return -ENODEV;
	510	}
	511
	512	ps8622->connector.polled = DRM_CONNECTOR_POLL_HPD;
	513	ret = drm_connector_init(bridge->dev, &ps8622->connector,
	514	&ps8622_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
	515	if (ret) {
	516	DRM_ERROR("Failed to initialize connector with drm\n");
	517	return ret;
	518	}
	519	drm_connector_helper_add(&ps8622->connector,
	520	&ps8622_connector_helper_funcs);
	521	drm_connector_register(&ps8622->connector);
	522	drm_mode_connector_attach_encoder(&ps8622->connector,
	523	bridge->encoder);
	524
	525	if (ps8622->panel)
	526	drm_panel_attach(ps8622->panel, &ps8622->connector);
	527
	528	drm_helper_hpd_irq_event(ps8622->connector.dev);
	529
	530	return ret;
	531	}
	532
	533	static const struct drm_bridge_funcs ps8622_bridge_funcs = {
	534	.pre_enable = ps8622_pre_enable,
	535	.enable = ps8622_enable,
	536	.disable = ps8622_disable,
	537	.post_disable = ps8622_post_disable,
	538	.attach = ps8622_attach,
	539	};
	540
	541	static const struct of_device_id ps8622_devices[] = {
	542	{.compatible = "parade,ps8622",},
	543	{.compatible = "parade,ps8625",},
	544	{}
	545	};
	546	MODULE_DEVICE_TABLE(of, ps8622_devices);
	547
	548	static int ps8622_probe(struct i2c_client *client,
	549	const struct i2c_device_id *id)
	550	{
	551	struct device *dev = &client->dev;
	552	struct device_node endpoint, panel_node;
	553	struct ps8622_bridge *ps8622;
	554	int ret;
	555
	556	ps8622 = devm_kzalloc(dev, sizeof(*ps8622), GFP_KERNEL);
	557	if (!ps8622)
	558	return -ENOMEM;
	559
	560	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
	561	if (endpoint) {
	562	panel_node = of_graph_get_remote_port_parent(endpoint);
	563	if (panel_node) {
	564	ps8622->panel = of_drm_find_panel(panel_node);
	565	of_node_put(panel_node);
	566	if (!ps8622->panel)
567	return -EPROBE_DEFER;
568	}
569	}
570
571	ps8622->client = client;
572
573	ps8622->v12 = devm_regulator_get(dev, "vdd12");
574	if (IS_ERR(ps8622->v12)) {
575	dev_info(dev, "no 1.2v regulator found for PS8622\n");
576	ps8622->v12 = NULL;
577	}
578
a92bf307	579	ps8622->gpio_slp = devm_gpiod_get(dev, "sleep", GPIOD_OUT_HIGH);
b2ea8772 VP	580	if (IS_ERR(ps8622->gpio_slp)) {
	581	ret = PTR_ERR(ps8622->gpio_slp);
	582	dev_err(dev, "cannot get gpio_slp %d\n", ret);
	583	return ret;
	584	}
b2ea8772	585
b2ea8772 VP	586	/*
	587	* Assert the reset pin high to avoid the bridge being
	588	* initialized prematurely
	589	*/
a92bf307 UKK	590	ps8622->gpio_rst = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
	591	if (IS_ERR(ps8622->gpio_rst)) {
	592	ret = PTR_ERR(ps8622->gpio_rst);
	593	dev_err(dev, "cannot get gpio_rst %d\n", ret);
b2ea8772 VP	594	return ret;
	595	}
	596
	597	ps8622->max_lane_count = id->driver_data;
	598
	599	if (of_property_read_u32(dev->of_node, "lane-count",
	600	&ps8622->lane_count)) {
	601	ps8622->lane_count = ps8622->max_lane_count;
	602	} else if (ps8622->lane_count > ps8622->max_lane_count) {
	603	dev_info(dev, "lane-count property is too high,"
	604	"using max_lane_count\n");
	605	ps8622->lane_count = ps8622->max_lane_count;
	606	}
	607
	608	if (!of_find_property(dev->of_node, "use-external-pwm", NULL)) {
	609	ps8622->bl = backlight_device_register("ps8622-backlight",
	610	dev, ps8622, &ps8622_backlight_ops,
	611	NULL);
	612	if (IS_ERR(ps8622->bl)) {
	613	DRM_ERROR("failed to register backlight\n");
	614	ret = PTR_ERR(ps8622->bl);
	615	ps8622->bl = NULL;
	616	return ret;
	617	}
	618	ps8622->bl->props.max_brightness = PS8622_MAX_BRIGHTNESS;
	619	ps8622->bl->props.brightness = PS8622_MAX_BRIGHTNESS;
	620	}
	621
	622	ps8622->bridge.funcs = &ps8622_bridge_funcs;
	623	ps8622->bridge.of_node = dev->of_node;
	624	ret = drm_bridge_add(&ps8622->bridge);
	625	if (ret) {
	626	DRM_ERROR("Failed to add bridge\n");
	627	return ret;
	628	}
	629
	630	i2c_set_clientdata(client, ps8622);
	631
	632	return 0;
	633	}
	634
	635	static int ps8622_remove(struct i2c_client *client)
	636	{
	637	struct ps8622_bridge *ps8622 = i2c_get_clientdata(client);
	638
	639	if (ps8622->bl)
	640	backlight_device_unregister(ps8622->bl);
	641
	642	drm_bridge_remove(&ps8622->bridge);
	643
	644	return 0;
	645	}
	646
	647	static const struct i2c_device_id ps8622_i2c_table[] = {
	648	/* Device type, max_lane_count */
	649	{"ps8622", 1},
	650	{"ps8625", 2},
	651	{},
	652	};
	653	MODULE_DEVICE_TABLE(i2c, ps8622_i2c_table);
	654
8a7d56b3	655	static struct i2c_driver ps8622_driver = {
b2ea8772 VP	656	.id_table = ps8622_i2c_table,
	657	.probe = ps8622_probe,
	658	.remove = ps8622_remove,
	659	.driver = {
	660	.name = "ps8622",
b2ea8772 VP	661	.of_match_table = ps8622_devices,
	662	},
	663	};
	664	module_i2c_driver(ps8622_driver);
	665
	666	MODULE_AUTHOR("Vincent Palatin <vpalatin@chromium.org>");
	667	MODULE_DESCRIPTION("Parade ps8622/ps8625 eDP-LVDS converter driver");
	668	MODULE_LICENSE("GPL v2");