path: root/drivers/gpu/drm/bridge/lontium-lt9611.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2018, The Linux Foundation. All rights reserved.
 * Copyright (c) 2019-2020. Linaro Limited.
 */

#include <linux/gpio/consumer.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>

#include <sound/hdmi-codec.h>

#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>

#define EDID_SEG_SIZE	256
#define EDID_LEN	32
#define EDID_LOOP	8
#define KEY_DDC_ACCS_DONE 0x02
#define DDC_NO_ACK	0x50

#define LT9611_4LANES	0

struct lt9611 {
	struct device *dev;
	struct drm_bridge bridge;
	struct drm_connector connector;

	struct regmap *regmap;

	struct device_node *dsi0_node;
	struct device_node *dsi1_node;
	struct mipi_dsi_device *dsi0;
	struct mipi_dsi_device *dsi1;
	struct platform_device *audio_pdev;

	bool ac_mode;

	struct gpio_desc *reset_gpio;
	struct gpio_desc *enable_gpio;

	bool power_on;
	bool sleep;

	struct regulator_bulk_data supplies[2];

	struct i2c_client *client;

	enum drm_connector_status status;

	u8 edid_buf[EDID_SEG_SIZE];
	u32 vic;
};

#define LT9611_PAGE_CONTROL	0xff

static const struct regmap_range_cfg lt9611_ranges[] = {
	{
		.name = "register_range",
		.range_min =  0,
		.range_max = 0x85ff,
		.selector_reg = LT9611_PAGE_CONTROL,
		.selector_mask = 0xff,
		.selector_shift = 0,
		.window_start = 0,
		.window_len = 0x100,
	},
};

static const struct regmap_config lt9611_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = 0xffff,
	.ranges = lt9611_ranges,
	.num_ranges = ARRAY_SIZE(lt9611_ranges),
};

struct lt9611_mode {
	u16 hdisplay;
	u16 vdisplay;
	u8 vrefresh;
	u8 lanes;
	u8 intfs;
};

static struct lt9611_mode lt9611_modes[] = {
	{ 3840, 2160, 30, 4, 2 }, /* 3840x2160 24bit 30Hz 4Lane 2ports */
	{ 1920, 1080, 60, 4, 1 }, /* 1080P 24bit 60Hz 4lane 1port */
	{ 1920, 1080, 30, 3, 1 }, /* 1080P 24bit 30Hz 3lane 1port */
	{ 1920, 1080, 24, 3, 1 },
	{ 720, 480, 60, 4, 1 },
	{ 720, 576, 50, 2, 1 },
	{ 640, 480, 60, 2, 1 },
};

static struct lt9611 *bridge_to_lt9611(struct drm_bridge *bridge)
{
	return container_of(bridge, struct lt9611, bridge);
}

static struct lt9611 *connector_to_lt9611(struct drm_connector *connector)
{
	return container_of(connector, struct lt9611, connector);
}

static int lt9611_mipi_input_analog(struct lt9611 *lt9611)
{
	const struct reg_sequence reg_cfg[] = {
		{ 0x8106, 0x40 }, /* port A rx current */
		{ 0x810a, 0xfe }, /* port A ldo voltage set */
		{ 0x810b, 0xbf }, /* enable port A lprx */
		{ 0x8111, 0x40 }, /* port B rx current */
		{ 0x8115, 0xfe }, /* port B ldo voltage set */
		{ 0x8116, 0xbf }, /* enable port B lprx */

		{ 0x811c, 0x03 }, /* PortA clk lane no-LP mode */
		{ 0x8120, 0x03 }, /* PortB clk lane with-LP mode */
	};

	return regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
}

static int lt9611_mipi_input_digital(struct lt9611 *lt9611,
				     const struct drm_display_mode *mode