path: root/drivers/gpu/drm/panel/panel-boe-himax8279d.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2019, Huaqin Telecom Technology Co., Ltd
 *
 * Author: Jerry Han <jerry.han.hq@gmail.com>
 *
 */

#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>

#include <linux/gpio/consumer.h>
#include <linux/regulator/consumer.h>

#include <drm/drm_device.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>

#include <video/mipi_display.h>

struct panel_cmd {
	char cmd;
	char data;
};

struct panel_desc {
	const struct drm_display_mode *display_mode;
	unsigned int bpc;
	unsigned int width_mm;
	unsigned int height_mm;

	unsigned long mode_flags;
	enum mipi_dsi_pixel_format format;
	unsigned int lanes;
	const struct panel_cmd *on_cmds;
	unsigned int on_cmds_num;
};

struct panel_info {
	struct drm_panel base;
	struct mipi_dsi_device *link;
	const struct panel_desc *desc;

	struct gpio_desc *enable_gpio;
	struct gpio_desc *pp33_gpio;
	struct gpio_desc *pp18_gpio;

	bool prepared;
	bool enabled;
};

static inline struct panel_info *to_panel_info(struct drm_panel *panel)
{
	return container_of(panel, struct panel_info, base);
}

static void disable_gpios(struct panel_info *pinfo)
{
	gpiod_set_value(pinfo->enable_gpio, 0);
	gpiod_set_value(pinfo->pp33_gpio, 0);
	gpiod_set_value(pinfo->pp18_gpio, 0);
}

static int send_mipi_cmds(struct drm_panel *panel, const struct panel_cmd *cmds)
{
	struct panel_info *pinfo = to_panel_info(panel);
	unsigned int i = 0;
	int err;

	for (i = 0; i < pinfo->desc->on_cmds_num; i++) {
		err = mipi_dsi_dcs_write_buffer(pinfo->link, &cmds[i],
						sizeof(struct panel_cmd));

		if (err < 0)
			return err;
	}

	return 0;
}

static int boe_panel_disable(struct drm_panel *panel)
{
	struct panel_info *pinfo = to_panel_info(panel);
	int err;

	if (!pinfo->enabled)
		return 0;

	err = mipi_dsi_dcs_set_display_off(pinfo->link);
	if (err < 0) {
		dev_err(panel->dev, "failed to set display off: %d\n", err);
		return err;
	}

	pinfo->enabled = false;

	return 0;
}

static int boe_panel_unprepare(struct drm_panel *panel)
{
	struct panel_info *pinfo = to_panel_info(panel);
	int err;

	if (!pinfo->prepared)
		return 0;

	err = mipi_dsi_dcs_set_display_off(pinfo->link);
	if (err < 0)
		dev_err(panel->dev, "failed to set display off: %d\n", err);

	err = mipi_dsi_dcs_enter_sleep_mode(pinfo->link);
	if (err < 0)
		dev_err(panel->dev, "failed to enter sleep mode: %d\n", err);

	/* sleep_mode_delay: 1ms - 2ms */
	usleep_range(1000, 2000);

	disable_gpios(pinfo);

	pinfo->prepared = false;

	return 0;
}

static int boe_panel_prepare(struct drm_panel *panel)
{
	struct panel_info *pinfo = to_panel_info(panel);
	int err;

	if (pinfo->prepared)
		return 0;

	gpiod_set_value(pinfo->pp18_gpio, 1);
	/* T1: 5ms - 6ms */
	usleep_range(5000, 6000);
	gpiod_set_value(pinfo->pp33_gpio, 1);

	/* reset sequence */
	/* T2: 14ms - 15ms */
	usleep_range(14000, 15000);
	gpiod_set_value(pinfo->enable_gpio, 1);

	/* T3: 1ms - 2ms */
	usleep_range(1000, 2000);
	gpiod_set_value(pinfo->enable_gpio, 0);

	/* T4: 1ms - 2ms */
	usleep_range(1000, 2000);
	gpiod_set_value(pinfo->enable_gpio, 1);

	/* T5: 5ms - 6ms */
	usleep_range(5000, 6000);

	/* send init code */
	err = send_mipi_cmds(panel, pinfo->desc->on_cmds);
	if (err < 0) {
		dev_err(panel->dev, "failed to send DCS Init Code: %d\n", err);
		goto poweroff;
	}

	err = mipi_dsi_dcs_exit_sleep_mode(pinfo->link);
	if (err < 0) {
		dev_err(panel->dev, "failed to exit sleep mode: %d\n", err);
		goto poweroff;
	}

	/* T6: 120ms - 121ms */
	usleep_range(120000, 121000);

	err = mipi_dsi_dcs_set_display_on(pinfo->link);
	if (err < 0) {
		dev_err(panel->dev, "failed to set display on: %d\n", err);
		goto poweroff;
	}

	/* T7: 20ms - 21ms */
	usleep_range(20000, 21000);

	pinfo->prepared = true;

	return 0;

poweroff:
	disable_gpios(pinfo);
	return err;
}

static int boe_panel_enable(struct drm_panel *panel)
{
	struct panel_info *pinfo = to_panel_info(panel);
	int ret;

	if (pinfo->enabled)
		return 0;

	usleep_range(120000, 121000);

	ret = mipi_dsi_dcs_set_display_on(pinfo->link);
	if (ret < 0) {
		dev_err(panel->dev, "failed to set display on: %d\n", ret);
		return ret;
	}

	pinfo->enabled = true;

	return 0;
}

static int boe_panel_get_modes(struct drm_panel *panel,
			       struct drm_connector *connector)
{
	struct panel_info *pinfo = to_panel_info(panel);
	const struct drm_display_mode *m = pinfo->desc->display_mode;
	struct drm_display_mode *mode;

	mode = drm_mode_duplicate(connector