[mirror_ubuntu-focal-kernel.git] / drivers / gpu / drm / bridge / sii902x.c

/*
 * Copyright (C) 2016 Atmel
 *		      Bo Shen <voice.shen@atmel.com>
 *
 * Authors:	      Bo Shen <voice.shen@atmel.com>
 *		      Boris Brezillon <boris.brezillon@free-electrons.com>
 *		      Wu, Songjun <Songjun.Wu@atmel.com>
 *
 *
 * Copyright (C) 2010-2011 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/regmap.h>

#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_edid.h>

#define SII902X_TPI_VIDEO_DATA			0x0

#define SII902X_TPI_PIXEL_REPETITION		0x8
#define SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT     BIT(5)
#define SII902X_TPI_AVI_PIXEL_REP_RISING_EDGE   BIT(4)
#define SII902X_TPI_AVI_PIXEL_REP_4X		3
#define SII902X_TPI_AVI_PIXEL_REP_2X		1
#define SII902X_TPI_AVI_PIXEL_REP_NONE		0
#define SII902X_TPI_CLK_RATIO_HALF		(0 << 6)
#define SII902X_TPI_CLK_RATIO_1X		(1 << 6)
#define SII902X_TPI_CLK_RATIO_2X		(2 << 6)
#define SII902X_TPI_CLK_RATIO_4X		(3 << 6)

#define SII902X_TPI_AVI_IN_FORMAT		0x9
#define SII902X_TPI_AVI_INPUT_BITMODE_12BIT	BIT(7)
#define SII902X_TPI_AVI_INPUT_DITHER		BIT(6)
#define SII902X_TPI_AVI_INPUT_RANGE_LIMITED	(2 << 2)
#define SII902X_TPI_AVI_INPUT_RANGE_FULL	(1 << 2)
#define SII902X_TPI_AVI_INPUT_RANGE_AUTO	(0 << 2)
#define SII902X_TPI_AVI_INPUT_COLORSPACE_BLACK	(3 << 0)
#define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV422	(2 << 0)
#define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV444	(1 << 0)
#define SII902X_TPI_AVI_INPUT_COLORSPACE_RGB	(0 << 0)

#define SII902X_TPI_AVI_INFOFRAME		0x0c

#define SII902X_SYS_CTRL_DATA			0x1a
#define SII902X_SYS_CTRL_PWR_DWN		BIT(4)
#define SII902X_SYS_CTRL_AV_MUTE		BIT(3)
#define SII902X_SYS_CTRL_DDC_BUS_REQ		BIT(2)
#define SII902X_SYS_CTRL_DDC_BUS_GRTD		BIT(1)
#define SII902X_SYS_CTRL_OUTPUT_MODE		BIT(0)
#define SII902X_SYS_CTRL_OUTPUT_HDMI		1
#define SII902X_SYS_CTRL_OUTPUT_DVI		0

#define SII902X_REG_CHIPID(n)			(0x1b + (n))

#define SII902X_PWR_STATE_CTRL			0x1e
#define SII902X_AVI_POWER_STATE_MSK		GENMASK(1, 0)
#define SII902X_AVI_POWER_STATE_D(l)		((l) & SII902X_AVI_POWER_STATE_MSK)

#define SII902X_INT_ENABLE			0x3c
#define SII902X_INT_STATUS			0x3d
#define SII902X_HOTPLUG_EVENT			BIT(0)
#define SII902X_PLUGGED_STATUS			BIT(2)

#define SII902X_REG_TPI_RQB			0xc7

#define SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS	500

struct sii902x {
	struct i2c_client *i2c;
	struct regmap *regmap;
	struct drm_bridge bridge;
	struct drm_connector connector;
	struct gpio_desc *reset_gpio;
};

static inline struct sii902x *bridge_to_sii902x(struct drm_bridge *bridge)
{
	return container_of(bridge, struct sii902x, bridge);
}

static inline struct sii902x *connector_to_sii902x(struct drm_connector *con)
{
	return container_of(con, struct sii902x, connector);
}

static void sii902x_reset(struct sii902x *sii902x)
{
	if (!sii902x->reset_gpio)
		return;

	gpiod_set_value(sii902x->reset_gpio, 1);

	/* The datasheet says treset-min = 100us. Make it 150us to be sure. */
	usleep_range(150, 200);

	gpiod_set_value(sii902x->reset_gpio, 0);
}

static enum drm_connector_status
sii902x_connector_detect(struct drm_connector *connector, bool force)
{
	struct sii902x *sii902x = connector_to_sii902x(connector);
	unsigned int status;

	regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);

	return (status & SII902X_PLUGGED_STATUS) ?
	       connector_status_connected : connector_status_disconnected;
}

static const struct drm_connector_funcs sii902x_connector_funcs = {
	.detect = sii902x_connector_detect,
	.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 sii902x_get_modes(struct drm_connector *connector)
{
	struct sii902x *sii902x = connector_to_sii902x(connector);
	struct regmap *regmap = sii902x->regmap;
	u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
	struct device *dev = &sii902x->i2c->dev;
	unsigned long timeout;
	unsigned int retries;
	unsigned int status;
	struct edid *edid;
	int num = 0;
	int ret;

	ret = regmap_update_bits(regmap, SII902X_SYS_CTRL_DATA,
				 SII902X_SYS_CTRL_DDC_BUS_REQ,
				 SII902X_SYS_CTRL_DDC_BUS_REQ);
	if (ret)
		return ret;

	timeout = jiffies +
		  msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
	do {
		ret = regmap_read(regmap, SII902X_SYS_CTRL_DATA, &status);
		if (ret)
			return ret;
	} while (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
		 time_before(jiffies, timeout));

	if (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
		dev_err(dev, "failed to acquire the i2c bus\n");
		return -ETIMEDOUT;
	}

	ret = regmap_write(regmap, SII902X_SYS_CTRL_DATA, status);
	if (ret)
		return ret;

	edid = drm_get_edid(connector, sii902x->i2c->adapter);
	drm_connector_update_edid_property(connector, edid);
	if (edid) {
		num = drm_add_edid_modes(connector, edid);
		kfree(edid);
	}

	ret = drm_display_info_set_bus_formats(&connector->display_info,
					       &bus_format, 1);
	if (ret)
		return ret;

	/*
	 * Sometimes the I2C bus can stall after failure to use the
	 * EDID channel. Retry a few times to see if things clear
	 * up, else continue anyway.
	 */
	retries = 5;
	do {
		ret = regmap_read(regmap, SII902X_SYS_CTRL_DATA,
				  &status);
		retries--;
	} while (ret && retries);
	if (ret)
		dev_err(dev, "failed to read status (%d)\n", ret);

	ret = regmap_update_bits(regmap, SII902X_SYS_CTRL_DATA,
				 SII902X_SYS_CTRL_DDC_BUS_REQ |
				 SII902X_SYS_CTRL_DDC_BUS_GRTD, 0);
	if (ret)
		return ret;

	timeout = jiffies +
		  msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
	do {
		ret = regmap_read(regmap, SII902X_SYS_CTRL_DATA, &status);
		if (ret)
			return ret;
	} while (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
			   SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
		 time_before(jiffies, timeout));

	if (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
		      SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
		dev_err(dev, "failed to release the i2c bus\n");
		return -ETIMEDOUT;
	}

	return num;
}

static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
					       struct drm_display_mode *mode)
{
	/* TODO: check mode */

	return MODE_OK;
}

static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = {
	.get_modes = sii902x_get_modes,
	.mode_valid = sii902x_mode_valid,
};

static void sii902x_bridge_disable(struct drm_bridge *bridge)
{
	struct sii902x *sii902x = bridge_to_sii902x(bridge);

	regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
			   SII902X_SYS_CTRL_PWR_DWN,
			   SII902X_SYS_CTRL_PWR_DWN);
}

static void sii902x_bridge_enable(struct drm_bridge *bridge)
{
	struct sii902x *sii902x = bridge_to_sii902x(bridge);

	regmap_update_bits(sii902x->regmap, SII902X_PWR_STATE_CTRL,
			   SII902X_AVI_POWER_STATE_MSK,
			   SII902X_AVI_POWER_STATE_D(0));
	regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
			   SII902X_SYS_CTRL_PWR_DWN, 0);
}

static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
				    struct drm_display_mode *mode,
				    struct drm_display_mode *adj)
{
	struct sii902x *sii902x = bridge_to_sii902x(bridge);
	struct regmap *regmap = sii902x->regmap;
	u8 buf[HDMI_INFOFRAME_SIZE(AVI)];
	struct hdmi_avi_infoframe frame;
	int ret;

	buf[0] = adj->clock;
	buf[1] = adj->clock >> 8;
	buf[2] = adj->vrefresh;
	buf[3] = 0x00;
	buf[4] = adj->hdisplay;
	buf[5] = adj->hdisplay >> 8;
	buf[6] = adj->vdisplay;
	buf[7] = adj->vdisplay >> 8;
	buf[8] = SII902X_TPI_CLK_RATIO_1X | SII902X_TPI_AVI_PIXEL_REP_NONE |
		 SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT;
	buf[9] = SII902X_TPI_AVI_INPUT_RANGE_AUTO |
		 SII902X_TPI_AVI_INPUT_COLORSPACE_RGB;

	ret = regmap_bulk_write(regmap, SII902X_TPI_VIDEO_DATA, buf, 10);
	if (ret)
		return;

	ret = drm_hdmi_avi_infoframe_from_display_mode(&frame, adj, false);
	if (ret < 0) {
		DRM_ERROR("couldn't fill AVI infoframe\n");
		return;
	}

	ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf));
	if (ret < 0) {
		DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
		return;
	}

	/* Do not send the infoframe header, but keep the CRC field. */
	regmap_bulk_write(regmap, SII902X_TPI_AVI_INFOFRAME,
			  buf + HDMI_INFOFRAME_HEADER_SIZE - 1,
			  HDMI_AVI_INFOFRAME_SIZE + 1);
}

static int sii902x_bridge_attach(struct drm_bridge *bridge)
{
	struct sii902x *sii902x = bridge_to_sii902x(bridge);
	struct drm_device *drm = bridge->dev;
	int ret;

	drm_connector_helper_add(&sii902x->connector,
				 &sii902x_connector_helper_funcs);

	if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) {
		dev_err(&sii902x->i2c->dev,
			"sii902x driver is only compatible with DRM devices supporting atomic updates\n");
		return -ENOTSUPP;
	}

	ret = drm_connector_init(drm, &sii902x->connector,
				 &sii902x_connector_funcs,
				 DRM_MODE_CONNECTOR_HDMIA);
	if (ret)
		return ret;

	if (sii902x->i2c->irq > 0)
		sii902x->connector.polled = DRM_CONNECTOR_POLL_HPD;
	else
		sii902x->connector.polled = DRM_CONNECTOR_POLL_CONNECT;

	drm_connector_attach_encoder(&sii902x->connector, bridge->encoder);

	return 0;
}

static const struct drm_bridge_funcs sii902x_bridge_funcs = {
	.attach = sii902x_bridge_attach,
	.mode_set = sii902x_bridge_mode_set,
	.disable = sii902x_bridge_disable,
	.enable = sii902x_bridge_enable,
};

static const struct regmap_range sii902x_volatile_ranges[] = {
	{ .range_min = 0, .range_max = 0xff },
};

static const struct regmap_access_table sii902x_volatile_table = {
	.yes_ranges = sii902x_volatile_ranges,
	.n_yes_ranges = ARRAY_SIZE(sii902x_volatile_ranges),
};

static const struct regmap_config sii902x_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.volatile_table = &sii902x_volatile_table,
	.cache_type = REGCACHE_NONE,
};

static irqreturn_t sii902x_interrupt(int irq, void *data)
{
	struct sii902x *sii902x = data;
	unsigned int status = 0;

	regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
	regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);

	if ((status & SII902X_HOTPLUG_EVENT) && sii902x->bridge.dev)
		drm_helper_hpd_irq_event(sii902x->bridge.dev);

	return IRQ_HANDLED;
}

static int sii902x_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	unsigned int status = 0;
	struct sii902x *sii902x;
	u8 chipid[4];
	int ret;

	sii902x = devm_kzalloc(dev, sizeof(*sii902x), GFP_KERNEL);
	if (!sii902x)
		return -ENOMEM;

	sii902x->i2c = client;
	sii902x->regmap = devm_regmap_init_i2c(client, &sii902x_regmap_config);
	if (IS_ERR(sii902x->regmap))
		return PTR_ERR(sii902x->regmap);

	sii902x->reset_gpio = devm_gpiod_get_optional(dev, "reset",
						      GPIOD_OUT_LOW);
	if (IS_ERR(sii902x->reset_gpio)) {
		dev_err(dev, "Failed to retrieve/request reset gpio: %ld\n",
			PTR_ERR(sii902x->reset_gpio));
		return PTR_ERR(sii902x->reset_gpio);
	}

	sii902x_reset(sii902x);

	ret = regmap_write(sii902x->regmap, SII902X_REG_TPI_RQB, 0x0);
	if (ret)
		return ret;

	ret = regmap_bulk_read(sii902x->regmap, SII902X_REG_CHIPID(0),
			       &chipid, 4);
	if (ret) {
		dev_err(dev, "regmap_read failed %d\n", ret);
		return ret;
	}

	if (chipid[0] != 0xb0) {
		dev_err(dev, "Invalid chipid: %02x (expecting 0xb0)\n",
			chipid[0]);
		return -EINVAL;
	}

	/* Clear all pending interrupts */
	regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
	regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);

	if (client->irq > 0) {
		regmap_write(sii902x->regmap, SII902X_INT_ENABLE,
			     SII902X_HOTPLUG_EVENT);

		ret = devm_request_threaded_irq(dev, client->irq, NULL,
						sii902x_interrupt,
						IRQF_ONESHOT, dev_name(dev),
						sii902x);
		if (ret)
			return ret;
	}

	sii902x->bridge.funcs = &sii902x_bridge_funcs;
	sii902x->bridge.of_node = dev->of_node;
	drm_bridge_add(&sii902x->bridge);

	i2c_set_clientdata(client, sii902x);

	return 0;
}

static int sii902x_remove(struct i2c_client *client)

{
	struct sii902x *sii902x = i2c_get_clientdata(client);

	drm_bridge_remove(&sii902x->bridge);

	return 0;
}

static const struct of_device_id sii902x_dt_ids[] = {
	{ .compatible = "sil,sii9022", },
	{ }
};
MODULE_DEVICE_TABLE(of, sii902x_dt_ids);

static const struct i2c_device_id sii902x_i2c_ids[] = {
	{ "sii9022", 0 },
	{ },
};
MODULE_DEVICE_TABLE(i2c, sii902x_i2c_ids);

static struct i2c_driver sii902x_driver = {
	.probe = sii902x_probe,
	.remove = sii902x_remove,
	.driver = {
		.name = "sii902x",
		.of_match_table = sii902x_dt_ids,
	},
	.id_table = sii902x_i2c_ids,
};
module_i2c_driver(sii902x_driver);

MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
MODULE_DESCRIPTION("SII902x RGB -> HDMI bridges");
MODULE_LICENSE("GPL");
Commit	Line	Data
675605c1 BB	1	/*
	2	* Copyright (C) 2016 Atmel
	3	* Bo Shen <voice.shen@atmel.com>
	4	*
	5	* Authors: Bo Shen <voice.shen@atmel.com>
	6	* Boris Brezillon <boris.brezillon@free-electrons.com>
	7	* Wu, Songjun <Songjun.Wu@atmel.com>
	8	*
	9	*
	10	* Copyright (C) 2010-2011 Freescale Semiconductor, Inc. All Rights Reserved.
	11	*
	12	* This program is free software; you can redistribute it and/or modify
	13	* it under the terms of the GNU General Public License as published by
	14	* the Free Software Foundation; either version 2 of the License, or
	15	* (at your option) any later version.
	16	*
	17	* This program is distributed in the hope that it will be useful,
	18	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	20	* GNU General Public License for more details.
	21	*/
	22
	23	#include <linux/gpio/consumer.h>
	24	#include <linux/i2c.h>
	25	#include <linux/module.h>
	26	#include <linux/regmap.h>
	27
	28	#include <drm/drmP.h>
	29	#include <drm/drm_atomic_helper.h>
	30	#include <drm/drm_crtc_helper.h>
	31	#include <drm/drm_edid.h>
	32
	33	#define SII902X_TPI_VIDEO_DATA 0x0
	34
	35	#define SII902X_TPI_PIXEL_REPETITION 0x8
	36	#define SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT BIT(5)
	37	#define SII902X_TPI_AVI_PIXEL_REP_RISING_EDGE BIT(4)
	38	#define SII902X_TPI_AVI_PIXEL_REP_4X 3
	39	#define SII902X_TPI_AVI_PIXEL_REP_2X 1
	40	#define SII902X_TPI_AVI_PIXEL_REP_NONE 0
	41	#define SII902X_TPI_CLK_RATIO_HALF (0 << 6)
	42	#define SII902X_TPI_CLK_RATIO_1X (1 << 6)
	43	#define SII902X_TPI_CLK_RATIO_2X (2 << 6)
	44	#define SII902X_TPI_CLK_RATIO_4X (3 << 6)
	45
	46	#define SII902X_TPI_AVI_IN_FORMAT 0x9
	47	#define SII902X_TPI_AVI_INPUT_BITMODE_12BIT BIT(7)
	48	#define SII902X_TPI_AVI_INPUT_DITHER BIT(6)
	49	#define SII902X_TPI_AVI_INPUT_RANGE_LIMITED (2 << 2)
	50	#define SII902X_TPI_AVI_INPUT_RANGE_FULL (1 << 2)
	51	#define SII902X_TPI_AVI_INPUT_RANGE_AUTO (0 << 2)
	52	#define SII902X_TPI_AVI_INPUT_COLORSPACE_BLACK (3 << 0)
	53	#define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV422 (2 << 0)
	54	#define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV444 (1 << 0)
	55	#define SII902X_TPI_AVI_INPUT_COLORSPACE_RGB (0 << 0)
	56
	57	#define SII902X_TPI_AVI_INFOFRAME 0x0c
	58
	59	#define SII902X_SYS_CTRL_DATA 0x1a
	60	#define SII902X_SYS_CTRL_PWR_DWN BIT(4)
	61	#define SII902X_SYS_CTRL_AV_MUTE BIT(3)
	62	#define SII902X_SYS_CTRL_DDC_BUS_REQ BIT(2)
	63	#define SII902X_SYS_CTRL_DDC_BUS_GRTD BIT(1)
	64	#define SII902X_SYS_CTRL_OUTPUT_MODE BIT(0)
65	#define SII902X_SYS_CTRL_OUTPUT_HDMI 1
66	#define SII902X_SYS_CTRL_OUTPUT_DVI 0
67
68	#define SII902X_REG_CHIPID(n) (0x1b + (n))
69
70	#define SII902X_PWR_STATE_CTRL 0x1e
71	#define SII902X_AVI_POWER_STATE_MSK GENMASK(1, 0)
72	#define SII902X_AVI_POWER_STATE_D(l) ((l) & SII902X_AVI_POWER_STATE_MSK)
73
74	#define SII902X_INT_ENABLE 0x3c
75	#define SII902X_INT_STATUS 0x3d
76	#define SII902X_HOTPLUG_EVENT BIT(0)
77	#define SII902X_PLUGGED_STATUS BIT(2)
78
79	#define SII902X_REG_TPI_RQB 0xc7
80
81	#define SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS 500
82
83	struct sii902x {
84	struct i2c_client *i2c;
85	struct regmap *regmap;
86	struct drm_bridge bridge;
87	struct drm_connector connector;
88	struct gpio_desc *reset_gpio;
89	};
90
91	static inline struct sii902x bridge_to_sii902x(struct drm_bridge bridge)
92	{
93	return container_of(bridge, struct sii902x, bridge);
94	}
95
96	static inline struct sii902x connector_to_sii902x(struct drm_connector con)
97	{
98	return container_of(con, struct sii902x, connector);
99	}
100
101	static void sii902x_reset(struct sii902x *sii902x)
102	{
103	if (!sii902x->reset_gpio)
104	return;
105
106	gpiod_set_value(sii902x->reset_gpio, 1);
107
108	/* The datasheet says treset-min = 100us. Make it 150us to be sure. */
109	usleep_range(150, 200);
110
111	gpiod_set_value(sii902x->reset_gpio, 0);
112	}
113
114	static enum drm_connector_status
115	sii902x_connector_detect(struct drm_connector *connector, bool force)
116	{
117	struct sii902x *sii902x = connector_to_sii902x(connector);
118	unsigned int status;
119
120	regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
121
122	return (status & SII902X_PLUGGED_STATUS) ?
123	connector_status_connected : connector_status_disconnected;
124	}
125
126	static const struct drm_connector_funcs sii902x_connector_funcs = {
675605c1 BB	127	.detect = sii902x_connector_detect,
	128	.fill_modes = drm_helper_probe_single_connector_modes,
	129	.destroy = drm_connector_cleanup,
	130	.reset = drm_atomic_helper_connector_reset,
	131	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	132	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
	133	};
	134
	135	static int sii902x_get_modes(struct drm_connector *connector)
	136	{
	137	struct sii902x *sii902x = connector_to_sii902x(connector);
	138	struct regmap *regmap = sii902x->regmap;
	139	u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
2e7a66a8	140	struct device *dev = &sii902x->i2c->dev;
675605c1	141	unsigned long timeout;
2e7a66a8	142	unsigned int retries;
675605c1 BB	143	unsigned int status;
	144	struct edid *edid;
	145	int num = 0;
	146	int ret;
	147
	148	ret = regmap_update_bits(regmap, SII902X_SYS_CTRL_DATA,
	149	SII902X_SYS_CTRL_DDC_BUS_REQ,
	150	SII902X_SYS_CTRL_DDC_BUS_REQ);
	151	if (ret)
	152	return ret;
	153
	154	timeout = jiffies +
	155	msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
	156	do {
	157	ret = regmap_read(regmap, SII902X_SYS_CTRL_DATA, &status);
	158	if (ret)
	159	return ret;
	160	} while (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
	161	time_before(jiffies, timeout));
	162
	163	if (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
2e7a66a8	164	dev_err(dev, "failed to acquire the i2c bus\n");
675605c1 BB	165	return -ETIMEDOUT;
	166	}
	167
	168	ret = regmap_write(regmap, SII902X_SYS_CTRL_DATA, status);
	169	if (ret)
	170	return ret;
	171
	172	edid = drm_get_edid(connector, sii902x->i2c->adapter);
c555f023	173	drm_connector_update_edid_property(connector, edid);
675605c1 BB	174	if (edid) {
	175	num = drm_add_edid_modes(connector, edid);
	176	kfree(edid);
	177	}
	178
	179	ret = drm_display_info_set_bus_formats(&connector->display_info,
	180	&bus_format, 1);
	181	if (ret)
	182	return ret;
	183
2e7a66a8 LW	184	/*
	185	* Sometimes the I2C bus can stall after failure to use the
	186	* EDID channel. Retry a few times to see if things clear
	187	* up, else continue anyway.
	188	*/
	189	retries = 5;
	190	do {
	191	ret = regmap_read(regmap, SII902X_SYS_CTRL_DATA,
	192	&status);
	193	retries--;
	194	} while (ret && retries);
675605c1	195	if (ret)
2e7a66a8	196	dev_err(dev, "failed to read status (%d)\n", ret);
675605c1 BB	197
	198	ret = regmap_update_bits(regmap, SII902X_SYS_CTRL_DATA,
	199	SII902X_SYS_CTRL_DDC_BUS_REQ \|
	200	SII902X_SYS_CTRL_DDC_BUS_GRTD, 0);
	201	if (ret)
	202	return ret;
	203
	204	timeout = jiffies +
	205	msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
	206	do {
	207	ret = regmap_read(regmap, SII902X_SYS_CTRL_DATA, &status);
	208	if (ret)
	209	return ret;
	210	} while (status & (SII902X_SYS_CTRL_DDC_BUS_REQ \|
	211	SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
	212	time_before(jiffies, timeout));
	213
	214	if (status & (SII902X_SYS_CTRL_DDC_BUS_REQ \|
	215	SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
2e7a66a8	216	dev_err(dev, "failed to release the i2c bus\n");
675605c1 BB	217	return -ETIMEDOUT;
	218	}
	219
	220	return num;
	221	}
	222
	223	static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
	224	struct drm_display_mode *mode)
	225	{
	226	/* TODO: check mode */
	227
	228	return MODE_OK;
	229	}
	230
	231	static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = {
	232	.get_modes = sii902x_get_modes,
	233	.mode_valid = sii902x_mode_valid,
	234	};
	235
	236	static void sii902x_bridge_disable(struct drm_bridge *bridge)
	237	{
	238	struct sii902x *sii902x = bridge_to_sii902x(bridge);
	239
	240	regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
	241	SII902X_SYS_CTRL_PWR_DWN,
	242	SII902X_SYS_CTRL_PWR_DWN);
	243	}
	244
	245	static void sii902x_bridge_enable(struct drm_bridge *bridge)
	246	{
	247	struct sii902x *sii902x = bridge_to_sii902x(bridge);
	248
	249	regmap_update_bits(sii902x->regmap, SII902X_PWR_STATE_CTRL,
	250	SII902X_AVI_POWER_STATE_MSK,
	251	SII902X_AVI_POWER_STATE_D(0));
	252	regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
	253	SII902X_SYS_CTRL_PWR_DWN, 0);
	254	}
	255
	256	static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
	257	struct drm_display_mode *mode,
	258	struct drm_display_mode *adj)
	259	{
	260	struct sii902x *sii902x = bridge_to_sii902x(bridge);
	261	struct regmap *regmap = sii902x->regmap;
	262	u8 buf[HDMI_INFOFRAME_SIZE(AVI)];
	263	struct hdmi_avi_infoframe frame;
	264	int ret;
	265
	266	buf[0] = adj->clock;
	267	buf[1] = adj->clock >> 8;
	268	buf[2] = adj->vrefresh;
	269	buf[3] = 0x00;
	270	buf[4] = adj->hdisplay;
	271	buf[5] = adj->hdisplay >> 8;
	272	buf[6] = adj->vdisplay;
	273	buf[7] = adj->vdisplay >> 8;
	274	buf[8] = SII902X_TPI_CLK_RATIO_1X \| SII902X_TPI_AVI_PIXEL_REP_NONE \|
	275	SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT;
	276	buf[9] = SII902X_TPI_AVI_INPUT_RANGE_AUTO \|
	277	SII902X_TPI_AVI_INPUT_COLORSPACE_RGB;
	278
	279	ret = regmap_bulk_write(regmap, SII902X_TPI_VIDEO_DATA, buf, 10);
	280	if (ret)
281	return;
282
0c1f528c	283	ret = drm_hdmi_avi_infoframe_from_display_mode(&frame, adj, false);
675605c1 BB	284	if (ret < 0) {
	285	DRM_ERROR("couldn't fill AVI infoframe\n");
	286	return;
	287	}
	288
	289	ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf));
	290	if (ret < 0) {
	291	DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
	292	return;
	293	}
	294
	295	/* Do not send the infoframe header, but keep the CRC field. */
	296	regmap_bulk_write(regmap, SII902X_TPI_AVI_INFOFRAME,
	297	buf + HDMI_INFOFRAME_HEADER_SIZE - 1,
	298	HDMI_AVI_INFOFRAME_SIZE + 1);
	299	}
	300
	301	static int sii902x_bridge_attach(struct drm_bridge *bridge)
	302	{
	303	struct sii902x *sii902x = bridge_to_sii902x(bridge);
	304	struct drm_device *drm = bridge->dev;
	305	int ret;
	306
	307	drm_connector_helper_add(&sii902x->connector,
	308	&sii902x_connector_helper_funcs);
	309
	310	if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) {
	311	dev_err(&sii902x->i2c->dev,
ce9971de	312	"sii902x driver is only compatible with DRM devices supporting atomic updates\n");
675605c1 BB	313	return -ENOTSUPP;
	314	}
	315
	316	ret = drm_connector_init(drm, &sii902x->connector,
	317	&sii902x_connector_funcs,
	318	DRM_MODE_CONNECTOR_HDMIA);
	319	if (ret)
	320	return ret;
	321
	322	if (sii902x->i2c->irq > 0)
	323	sii902x->connector.polled = DRM_CONNECTOR_POLL_HPD;
	324	else
	325	sii902x->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
	326
cde4c44d	327	drm_connector_attach_encoder(&sii902x->connector, bridge->encoder);
675605c1 BB	328
	329	return 0;
	330	}
	331
	332	static const struct drm_bridge_funcs sii902x_bridge_funcs = {
	333	.attach = sii902x_bridge_attach,
	334	.mode_set = sii902x_bridge_mode_set,
	335	.disable = sii902x_bridge_disable,
	336	.enable = sii902x_bridge_enable,
	337	};
	338
	339	static const struct regmap_range sii902x_volatile_ranges[] = {
	340	{ .range_min = 0, .range_max = 0xff },
	341	};
	342
	343	static const struct regmap_access_table sii902x_volatile_table = {
	344	.yes_ranges = sii902x_volatile_ranges,
	345	.n_yes_ranges = ARRAY_SIZE(sii902x_volatile_ranges),
	346	};
	347
	348	static const struct regmap_config sii902x_regmap_config = {
	349	.reg_bits = 8,
	350	.val_bits = 8,
	351	.volatile_table = &sii902x_volatile_table,
	352	.cache_type = REGCACHE_NONE,
	353	};
	354
	355	static irqreturn_t sii902x_interrupt(int irq, void *data)
	356	{
	357	struct sii902x *sii902x = data;
	358	unsigned int status = 0;
	359
	360	regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
	361	regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
	362
	363	if ((status & SII902X_HOTPLUG_EVENT) && sii902x->bridge.dev)
	364	drm_helper_hpd_irq_event(sii902x->bridge.dev);
	365
	366	return IRQ_HANDLED;
	367	}
	368
	369	static int sii902x_probe(struct i2c_client *client,
	370	const struct i2c_device_id *id)
	371	{
	372	struct device *dev = &client->dev;
	373	unsigned int status = 0;
	374	struct sii902x *sii902x;
	375	u8 chipid[4];
	376	int ret;
	377
	378	sii902x = devm_kzalloc(dev, sizeof(*sii902x), GFP_KERNEL);
	379	if (!sii902x)
	380	return -ENOMEM;
	381
	382	sii902x->i2c = client;
	383	sii902x->regmap = devm_regmap_init_i2c(client, &sii902x_regmap_config);
	384	if (IS_ERR(sii902x->regmap))
	385	return PTR_ERR(sii902x->regmap);
	386
	387	sii902x->reset_gpio = devm_gpiod_get_optional(dev, "reset",
	388	GPIOD_OUT_LOW);
	389	if (IS_ERR(sii902x->reset_gpio)) {
	390	dev_err(dev, "Failed to retrieve/request reset gpio: %ld\n",
	391	PTR_ERR(sii902x->reset_gpio));
392	return PTR_ERR(sii902x->reset_gpio);
393	}
394
395	sii902x_reset(sii902x);
396
397	ret = regmap_write(sii902x->regmap, SII902X_REG_TPI_RQB, 0x0);
398	if (ret)
399	return ret;
400
401	ret = regmap_bulk_read(sii902x->regmap, SII902X_REG_CHIPID(0),
402	&chipid, 4);
403	if (ret) {
404	dev_err(dev, "regmap_read failed %d\n", ret);
405	return ret;
406	}
407
408	if (chipid[0] != 0xb0) {
409	dev_err(dev, "Invalid chipid: %02x (expecting 0xb0)\n",
410	chipid[0]);
411	return -EINVAL;
412	}
413
414	/* Clear all pending interrupts */
415	regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
416	regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
417
418	if (client->irq > 0) {
419	regmap_write(sii902x->regmap, SII902X_INT_ENABLE,
420	SII902X_HOTPLUG_EVENT);
421
422	ret = devm_request_threaded_irq(dev, client->irq, NULL,
423	sii902x_interrupt,
424	IRQF_ONESHOT, dev_name(dev),
425	sii902x);
426	if (ret)
427	return ret;
428	}
429
430	sii902x->bridge.funcs = &sii902x_bridge_funcs;
431	sii902x->bridge.of_node = dev->of_node;
d341a640	432	drm_bridge_add(&sii902x->bridge);
675605c1 BB	433
	434	i2c_set_clientdata(client, sii902x);
	435
	436	return 0;
	437	}
	438
	439	static int sii902x_remove(struct i2c_client *client)
	440
	441	{
	442	struct sii902x *sii902x = i2c_get_clientdata(client);
	443
	444	drm_bridge_remove(&sii902x->bridge);
	445
	446	return 0;
	447	}
	448
	449	static const struct of_device_id sii902x_dt_ids[] = {
	450	{ .compatible = "sil,sii9022", },
	451	{ }
	452	};
	453	MODULE_DEVICE_TABLE(of, sii902x_dt_ids);
	454
	455	static const struct i2c_device_id sii902x_i2c_ids[] = {
	456	{ "sii9022", 0 },
	457	{ },
	458	};
	459	MODULE_DEVICE_TABLE(i2c, sii902x_i2c_ids);
	460
	461	static struct i2c_driver sii902x_driver = {
	462	.probe = sii902x_probe,
	463	.remove = sii902x_remove,
	464	.driver = {
	465	.name = "sii902x",
	466	.of_match_table = sii902x_dt_ids,
	467	},
	468	.id_table = sii902x_i2c_ids,
	469	};
	470	module_i2c_driver(sii902x_driver);
	471
	472	MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
	473	MODULE_DESCRIPTION("SII902x RGB -> HDMI bridges");
	474	MODULE_LICENSE("GPL");