drivers/gpu/drm/panel/panel-novatek-nt36672a.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2020 Linaro Ltd
 * Author: Sumit Semwal <sumit.semwal@linaro.org>
 *
 * This driver is for the DSI interface to panels using the NT36672A display driver IC
 * from Novatek.
 * Currently supported are the Tianma FHD+ panels found in some Xiaomi phones, including
 * some variants of the Poco F1 phone.
 *
 * Panels using the Novatek NT37762A IC should add appropriate configuration per-panel and
 * use this driver.
 */

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

#include <linux/gpio/consumer.h>
#include <linux/pinctrl/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 nt36672a_panel_cmd {
	const char data[2];
};

static const char * const nt36672a_regulator_names[] = {
	"vddio",
	"vddpos",
	"vddneg",
};

static unsigned long const nt36672a_regulator_enable_loads[] = {
	62000,
	100000,
	100000
};

struct nt36672a_panel_desc {
	const struct drm_display_mode *display_mode;
	const char *panel_name;

	unsigned int width_mm;
	unsigned int height_mm;

	unsigned long mode_flags;
	enum mipi_dsi_pixel_format format;
	unsigned int lanes;

	unsigned int num_on_cmds_1;
	const struct nt36672a_panel_cmd *on_cmds_1;
	unsigned int num_on_cmds_2;
	const struct nt36672a_panel_cmd *on_cmds_2;

	unsigned int num_off_cmds;
	const struct nt36672a_panel_cmd *off_cmds;
};

struct nt36672a_panel {
	struct drm_panel base;
	struct mipi_dsi_device *link;
	const struct nt36672a_panel_desc *desc;

	struct regulator_bulk_data supplies[ARRAY_SIZE(nt36672a_regulator_names)];

	struct gpio_desc *reset_gpio;

	bool prepared;
};

static inline struct nt36672a_panel *to_nt36672a_panel(struct drm_panel *panel)
{
	return container_of(panel, struct nt36672a_panel, base);
}

static int nt36672a_send_cmds(struct drm_panel *panel, const struct nt36672a_panel_cmd *cmds,
			      int num)
{
	struct nt36672a_panel *pinfo = to_nt36672a_panel(panel);
	unsigned int i;
	int err;

	for (i = 0; i < num; i++) {
		const struct nt36672a_panel_cmd *cmd = &cmds[i];

		err = mipi_dsi_dcs_write(pinfo->link, cmd->data[0], cmd->data + 1, 1);

		if (err < 0)
			return err;
	}

	return 0;
}

static int nt36672a_panel_power_off(struct drm_panel *panel)
{
	struct nt36672a_panel *pinfo = to_nt36672a_panel(panel);
	int ret = 0;

	gpiod_set_value(pinfo->reset_gpio, 1);

	ret = regulator_bulk_disable(ARRAY_SIZE(pinfo->supplies), pinfo->supplies);
	if (ret)
		dev_err(panel->dev, "regulator_bulk_disable failed %d\n", ret);

	return ret;
}

static int nt36672a_panel_unprepare(struct drm_panel *panel)
{
	struct nt36672a_panel *pinfo = to_nt36672a_panel(panel);
	int ret;

	if (!pinfo->prepared)
		return 0;

	/* send off cmds */
	ret = nt36672a_send_cmds(panel, pinfo->desc->off_cmds,
				 pinfo->desc->num_off_cmds);

	if (ret < 0)
		dev_err(panel->dev, "failed to send DCS off cmds: %d\n", ret);

	ret = mipi_dsi_dcs_set_display_off(pinfo->link);
	if (ret < 0)
		dev_err(panel->dev, "set_display_off cmd failed ret = %d\n", ret);

	/* 120ms delay required here as per DCS spec */
	msleep(120);

	ret = mipi_dsi_dcs_enter_sleep_mode(pinfo->link);
	if (ret < 0)
		dev_err(panel->dev, "enter_sleep cmd failed ret = %d\n", ret);

	/* 0x3C = 60ms delay */
	msleep(60);

	ret = nt36672a_panel_power_off(panel);
	if (ret < 0)
		dev_err(panel->dev, "power_off failed ret = %d\n", ret);

	pinfo->prepared = false;

	return ret;
}

static int nt36672a_panel_power_on(struct nt36672a_panel *pinfo)
{
	int ret;

	ret = regulator_bulk_enable(ARRAY_SIZE(pinfo->supplies), pinfo->supplies);
	if (ret < 0)
		return ret;

	/*
	 * As per downstream kernel, Reset sequence of Tianma FHD panel requires the panel to
	 * be out of reset for 10ms, followed by being held in reset for 10ms. But for Android
	 * AOSP, we needed to bump it upto 200ms otherwise we get white screen sometimes.
	 * FIXME: Try to reduce this 200ms to a lesser value.
	 */
	gpiod_set_value(pinfo->reset_gpio, 1);
	msleep(200);
	gpiod_set_value(pinfo->reset_gpio, 0);
	msleep(200);

	return 0;
}

static int nt36672a_panel_prepare(struct drm_panel *panel)
{
	struct nt36672a_panel *pinfo = to_nt36672a_panel(panel);
	int err;

	if (pinfo->prepared)
		return 0;

	err = nt36672a_panel_power_on(pinfo);
	if (err < 0)
		goto poweroff;

	/* send first part of init cmds */
	err = nt36672a_send_cmds(panel, pinfo->desc->on_cmds_1,
				 pinfo->desc->num_on_cmds_1);

	if (err < 0) {
		dev_err(panel->dev, "failed to send DCS Init 1st 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;
	}

	/* 0x46 = 70 ms delay */
	msleep(70);

	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;
	}

	/* Send rest of the init cmds */
	err = nt36672a_send_cmds(panel, pinfo->desc->on_cmds_2,
				 pinfo->desc->num_on_cmds_2);

	if (err < 0) {
		dev_err(panel->dev, "failed to send DCS Init 2nd Code: %d\n", err);
		goto poweroff;
	}

	msleep(120);

	pinfo->prepared = true;

	return 0;

poweroff:
	gpiod_set_value(pinfo->reset_gpio, 0);
	return err;
}

static int nt36672a_panel_get_modes(struct drm_panel *panel,
				    struct drm_connector *connector)
{
	struct nt36672a_panel *pinfo = to_nt36672a_panel(panel);
	const struct drm_display_mode *m = pinfo->desc->display_mode;
	struct drm_display_mode *mode;

	mode = drm_mode_duplicate(connector->dev, m);
	if (!mode) {
		dev_err(panel->dev, "failed to add mode %ux%u@%u\n", m->hdisplay,
			m->vdisplay, drm_mode_vrefresh(m));
		return -ENOMEM;
	}

	connector->display_info.width_mm = pinfo->desc->width_mm;
	connector->display_info.height_mm = pinfo->desc->height_mm;

	drm_mode_set_name(mode);
	drm_mode_probed_add(connector, mode);

	return 1;
}

static const struct drm_panel_funcs panel_funcs = {
	.unprepare = nt36672a_panel_unprepare,
	.prepare = nt36672a_panel_prepare,
	.get_modes = nt36672a_panel_get_modes,
};

static const struct nt36672a_panel_cmd tianma_fhd_video_on_cmds_1[] = {
	/* skin enhancement mode */
	{ .data = {0xFF, 0x22} },
	{ .data = {0x00, 0x40} },
	{ .data = {0x01, 0xC0} },
	{ .data = {0x02, 0x40} },
	{ .data = {0x03, 0x40} },
	{ .data = {0x04, 0x40} },
	{ .data = {0x05, 0x40} },
	{ .data = {0x06, 0x40} },
	{ .data = {0x07, 0x40} },
	{ .data = {0x08, 0x40} },
	{ .data = {0x09, 0x40} },
	{ .data = {0x0A, 0x40} },
	{ .data = {0x0B, 0x40} },
	{ .data = {0x0C, 0x40} },
	{ .data = {0x0D, 0x40} },
	{ .data = {0x0E, 0x40} },
	{ .data = {0x0F, 0x40} },
	{ .data = {0x10, 0x40} },
	{ .data = {0x11, 0x50} },
	{ .data = {0x12, 0x60} },
	{ .data = {0x13, 0x70} },
	{ .data = {0x14, 0x58} },
	{ .data = {0x15, 0x68} },
	{ .data = {0x16, 0x78} },
	{ .data = {0x17, 0x77} },
	{ .data = {0x18, 0x39} },
	{ .data = {0x19, 0x2D} },
	{ .data = {0x1A, 0x2E} },
	{ .data = {0x1B, 0x32} },
	{ .data = {0x1C, 0x37} },
	{ .data = {0x1D, 0x3A} },
	{ .data = {0x1E, 0x40} },
	{ .data = {0x1F, 0x40} },
	{ .data = {0x20, 0x40} },
	{ .data = {0x21, 0x40} },
	{ .data = {0x22, 0x40} },
	{ .data = {0x23, 0x40} },
	{ .data = {0x24, 0x40} },
	{ .data = {0x25, 0x40} },
	{ .data = {0x26, 0x40} },
	{ .data = {0x27, 0x40} },
	{ .data = {0x28, 0x40} },
	{ .data = {0x2D, 0x00} },
	{ .data = {0x2F, 0x40} },
	{ .data = {0x30, 0x40} },
	{ .data = {0x31, 0x40} },
	{ .data = {0x32, 0x40} },
	{ .data = {0x33, 0x40} },
	{ .data = {0x34, 0x40} },
	{ .data = {0x35, 0x40} },
	{ .data = {0x36, 0x40} },
	{ .data = {0x37, 0x40} },
	{ .data = {0x38, 0x40} },
	{ .data = {0x39, 0x40} },
	{ .data = {0x3A, 0x40} },
	{ .data = {0x3B, 0x40} },
	{ .data = {0x3D, 0x40} },
	{ .data = {0x3F, 0x40} },
	{ .data = {0x40, 0x40} },
	{ .data = {0x41, 0x40} },
	{ .data = {0x42, 0x40} },
	{ .data = {0x43, 0x40} },
	{ .data = {0x44, 0x40} },
	{ .data = {0x45, 0x40} },
	{ .data = {0x46, 0x40} },
	{ .data = {0x47, 0x40} },
	{ .data = {0x48, 0x40} },
	{ .data = {0x49, 0x40} },
	{ .data = {0x4A, 0x40} },
	{ .data = {0x4B, 0x40} },
	{ .data = {0x4C, 0x40} },
	{ .data = {0x4D, 0x40} },
	{ .data = {0x4E, 0x40} },
	{ .data = {0x4F, 0x40} },
	{ .data = {0x50, 0x40} },
	{ .data = {0x51, 0x40} },
	{ .data = {0x52, 0x40} },
	{ .data = {0x53, 0x01} },
	{ .data = {0x54, 0x01} },
	{ .data = {0x55, 0xFE} },
	{ .data = {0x56, 0x77} },
	{ .data = {0x58, 0xCD} },
	{ .data = {0x59, 0xD0} },
	{ .data = {0x5A, 0xD0} },
	{ .data = {0x5B, 0x50} },
	{ .data = {0x5C, 0x50} },
	{ .data = {0x5D, 0x50} },
	{ .data = {0x5E, 0x50} },
	{ .data = {0x5F, 0x50} },
	{ .data = {0x60, 0x50} },
	{ .data = {0x61, 0x50} },
	{ .data = {0x62, 0x50} },
	{ .data = {0x63, 0x50} },
	{ .data = {0x64, 0x50} },
	{ .data = {0x65, 0x50} },
	{ .data = {0x66, 0x50} },
	{ .data = {0x67, 0x50} },
	{ .data = {0x68, 0x50} },
	{ .data = {0x69, 0x50} },
	{ .data = {0x6A, 0x50} },
	{ .data = {0x6B, 0x50} },
	{ .data = {0x6C, 0x50} },
	{ .data = {0x6D, 0x50} },
	{ .data = {0x6E, 0x50} },
	{ .data = {0x6F, 0x50} },
	{ .data = {0x70, 0x07} },
	{ .data = {0x71, 0x00} },
	{ .data = {0x72, 0x00} },
	{ .data = {0x73, 0x00} },
	{ .data = {0x74, 0x06} },
	{ .data = {0x75, 0x0C} },
	{ .data = {0x76, 0x03} },
	{ .data = {0x77, 0x09} },
	{ .data = {0x78, 0x0F} },
	{ .data = {0x79, 0x68} },
	{ .data = {0x7A, 0x88} },
	{ .data = {0x7C, 0x80} },
	{ .data = {0x7D, 0x80} },
	{ .data = {0x7E, 0x80} },
	{ .data = {0x7F, 0x00} },
	{ .data = {0x80, 0x00} },
	{ .data = {0x81, 0x00} },
	{ .data = {0x83, 0x01} },
	{ .data = {0x84, 0x00} },
	{ .data = {0x85, 0x80} },
	{ .data = {0x86, 0x80} },
	{ .data = {0x87, 0x80} },
	{ .data = {0x88, 0x40} },
	{ .data = {0x89, 0x91} },
	{ .data = {0x8A, 0x98} },
	{ .data = {0x8B, 0x80} },
	{ .data = {0x8C, 0x80} },
	{ .data = {0x8D, 0x80} },
	{ .data = {0x8E, 0x80} },
	{ .data = {0x8F, 0x80} },
	{ .data = {0x90, 0x80} },
	{ .data = {0x91, 0x80} },
	{ .data = {0x92, 0x80} },
	{ .data = {0x93, 0x80} },
	{ .data = {0x94, 0x80} },
	{ .data = {0x95, 0x80} },
	{ .data = {0x96, 0x80} },
	{ .data = {0x97, 0x80} },
	{ .data = {0x98, 0x80} },
	{ .data = {0x99, 0x80} },
	{ .data = {0x9A, 0x80} },
	{ .data = {0x9B, 0x80} },
	{ .data = {0x9C, 0x80} },
	{ .data = {0x9D, 0x80} },
	{ .data = {0x9E, 0x80} },
	{ .data = {0x9F, 0x80} },
	{ .data = {0xA0, 0x8A} },
	{ .data = {0xA2, 0x80} },
	{ .data = {0xA6, 0x80} },
	{ .data = {0xA7, 0x80} },
	{ .data = {0xA9, 0x80} },
	{ .data = {0xAA, 0x80} },
	{ .data = {0xAB, 0x80} },
	{ .data = {0xAC, 0x80} },
	{ .data = {0xAD, 0x80} },
	{ .data = {0xAE, 0x80} },
	{ .data = {0xAF, 0x80} },
	{ .data = {0xB7, 0x76} },
	{ .data = {0xB8, 0x76} },
	{ .data = {0xB9, 0x05} },
	{ .data = {0xBA, 0x0D} },
	{ .data = {0xBB, 0x14} },
	{ .data = {0xBC, 0x0F} },
	{ .data = {0xBD, 0x18} },
	{ .data = {0xBE, 0x1F} },
	{ .data = {0xBF, 0x05} },
	{ .data = {0xC0, 0x0D} },
	{ .data = {0xC1, 0x14} },
	{ .data = {0xC2, 0x03} },
	{ .data = {0xC3, 0x07} },
	{ .data = {0xC4, 0x0A} },
	{ .data = {0xC5, 0xA0} },
	{ .data = {0xC6, 0x55} },
	{ .data = {0xC7, 0xFF} },
	{ .data = {0xC8, 0x39} },
	{ .data = {0xC9, 0x44} },
	{ .data = {0xCA, 0x12} },
	{ .data = {0xCD, 0x80} },
	{ .data = {0xDB, 0x80} },
	{ .data = {0xDC, 0x80} },
	{ .data = {0xDD, 0x80} },
	{ .data = {0xE0, 0x80} },
	{ .data = {0xE1, 0x80} },
	{ .data = {0xE2, 0x80} },
	{ .data = {0xE3, 0x80} },
	{ .data = {0xE4, 0x80} },
	{ .data = {0xE5, 0x40} },
	{ .data = {0xE6, 0x40} },
	{ .data = {0xE7, 0x40} },
	{ .data = {0xE8, 0x40} },
	{ .data = {0xE9, 0x40} },
	{ .data = {0xEA, 0x40} },
	{ .data = {0xEB, 0x40} },
	{ .data = {0xEC, 0x40} },
	{ .data = {0xED, 0x40} },
	{ .data = {0xEE, 0x40} },
	{ .data = {0xEF, 0x40} },
	{ .data = {0xF0, 0x40} },
	{ .data = {0xF1, 0x40} },
	{ .data = {0xF2, 0x40} },
	{ .data = {0xF3, 0x40} },
	{ .data = {0xF4, 0x40} },
	{ .data = {0xF5, 0x40} },
	{ .data = {0xF6, 0x40} },
	{ .data = {0xFB, 0x1} },
	{ .data = {0xFF, 0x23} },
	{ .data = {0xFB, 0x01} },
	/* dimming enable */
	{ .data = {0x01, 0x84} },
	{ .data = {0x05, 0x2D} },
	{ .data = {0x06, 0x00} },
	 /* resolution 1080*2246 */
	{ .data = {0x11, 0x01} },
	{ .data = {0x12, 0x7B} },
	{ .data = {0x15, 0x6F} },
	{ .data = {0x16, 0x0B} },
	 /* UI mode */
	{ .data = {0x29, 0x0A} },
	{ .data = {0x30, 0xFF} },
	{ .data = {0x31, 0xFF} },
	{ .data = {0x32, 0xFF} },
	{ .data = {0x33, 0xFF} },
	{ .data = {0x34, 0xFF} },
	{ .data = {0x35, 0xFF} },
	{ .data = {0x36, 0xFF} },
	{ .data = {0x37, 0xFF} },
	{ .data = {0x38, 0xFC} },
	{ .data = {0x39, 0xF8} },
	{ .data = {0x3A, 0xF4} },
	{ .data = {0x3B, 0xF1} },
	{ .data = {0x3D, 0xEE} },
	{ .data = {0x3F, 0xEB} },
	{ .data = {0x40, 0xE8} },
	{ .data = {0x41, 0xE5} },
	 /* STILL mode */
	{ .data = {0x2A, 0x13} },
	{ .data = {0x45, 0xFF} },
	{ .data = {0x46, 0xFF} },
	{ .data = {0x47, 0xFF} },
	{ .data = {0x48, 0xFF} },
	{ .data = {0x49, 0xFF} },
	{ .data = {0x4A, 0xFF} },
	{ .data = {0x4B, 0xFF} },
	{ .data = {0x4C, 0xFF} },
	{ .data = {0x4D, 0xED} },
	{ .data = {0x4E, 0xD5} },
	{ .data = {0x4F, 0xBF} },
	{ .data = {0x50, 0xA6} },
	{ .data = {0x51, 0x96} },
	{ .data = {0x52, 0x86} },
	{ .data = {0x53, 0x76} },
	{ .data = {0x54, 0x66} },
	 /* MOVING mode */
	{ .data = {0x2B, 0x0E} },
	{ .data = {0x58, 0xFF} },
	{ .data = {0x59, 0xFF} },
	{ .data = {0x5A, 0xFF} },
	{ .data = {0x5B, 0xFF} },
	{ .data = {0x5C, 0xFF} },
	{ .data = {0x5D, 0xFF} },
	{ .data = {0x5E, 0xFF} },
	{ .data = {0x5F, 0xFF} },
	{ .data = {0x60, 0xF6} },
	{ .data = {0x61, 0xEA} },
	{ .data = {0x62, 0xE1} },
	{ .data = {0x63, 0xD8} },
	{ .data = {0x64, 0xCE} },
	{ .data = {0x65, 0xC3} },
	{ .data = {0x66, 0xBA} },
	{ .data = {0x67, 0xB3} },
	{ .data = {0xFF, 0x25} },
	{ .data = {0xFB, 0x01} },
	{ .data = {0x05, 0x04} },
	{ .data = {0xFF, 0x26} },
	{ .data = {0xFB, 0x01} },
	{ .data = {0x1C, 0xAF} },
	{ .data = {0xFF, 0x10} },
	{ .data = {0xFB, 0x01} },
	{ .data = {0x51, 0xFF} },
	{ .data = {0x53, 0x24} },
	{ .data = {0x55, 0x00} },
};

static const struct nt36672a_panel_cmd tianma_fhd_video_on_cmds_2[] = {
	{ .data = {0xFF, 0x24} },
	{ .data = {0xFB, 0x01} },
	{ .data = {0xC3, 0x01} },
	{ .data = {0xC4, 0x54} },
	{ .data = {0xFF, 0x10} },
};

static const struct nt36672a_panel_cmd tianma_fhd_video_off_cmds[] = {
	{ .data = {0xFF, 0x24} },
	{ .data = {0xFB, 0x01} },
	{ .data = {0xC3, 0x01} },
	{ .data = {0xFF, 0x10} },
};

static const struct drm_display_mode tianma_fhd_video_panel_default_mode = {
	.clock		= 161331,

	.hdisplay	= 1080,
	.hsync_start	= 1080 + 40,
	.hsync_end	= 1080 + 40 + 20,
	.htotal		= 1080 + 40 + 20 + 44,

	.vdisplay	= 2246,
	.vsync_start	= 2246 + 15,
	.vsync_end	= 2246 + 15 + 2,
	.vtotal		= 2246 + 15 + 2 + 8,

	.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
};

static const struct nt36672a_panel_desc tianma_fhd_video_panel_desc = {
	.display_mode = &tianma_fhd_video_panel_default_mode,

	.width_mm = 68,
	.height_mm = 136,

	.mode_flags = MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_VIDEO
			| MIPI_DSI_MODE_VIDEO_HSE
			| MIPI_DSI_CLOCK_NON_CONTINUOUS
			| MIPI_DSI_MODE_VIDEO_BURST,
	.format = MIPI_DSI_FMT_RGB888,
	.lanes = 4,
	.on_cmds_1 = tianma_fhd_video_on_cmds_1,
	.num_on_cmds_1 = ARRAY_SIZE(tianma_fhd_video_on_cmds_1),
	.on_cmds_2 = tianma_fhd_video_on_cmds_2,
	.num_on_cmds_2 = ARRAY_SIZE(tianma_fhd_video_on_cmds_2),
	.off_cmds = tianma_fhd_video_off_cmds,
	.num_off_cmds = ARRAY_SIZE(tianma_fhd_video_off_cmds),
};

static int nt36672a_panel_add(struct nt36672a_panel *pinfo)
{
	struct device *dev = &pinfo->link->dev;
	int i, ret;

	for (i = 0; i < ARRAY_SIZE(pinfo->supplies); i++)
		pinfo->supplies[i].supply = nt36672a_regulator_names[i];

	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(pinfo->supplies),
				      pinfo->supplies);
	if (ret < 0)
		return dev_err_probe(dev, ret, "failed to get regulators\n");

	for (i = 0; i < ARRAY_SIZE(pinfo->supplies); i++) {
		ret = regulator_set_load(pinfo->supplies[i].consumer,
					 nt36672a_regulator_enable_loads[i]);
		if (ret)
			return dev_err_probe(dev, ret, "failed to set regulator enable loads\n");
	}

	pinfo->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
	if (IS_ERR(pinfo->reset_gpio))
		return dev_err_probe(dev, PTR_ERR(pinfo->reset_gpio),
				     "failed to get reset gpio from DT\n");

	drm_panel_init(&pinfo->base, dev, &panel_funcs, DRM_MODE_CONNECTOR_DSI);

	ret = drm_panel_of_backlight(&pinfo->base);
	if (ret)
		return dev_err_probe(dev, ret, "Failed to get backlight\n");

	drm_panel_add(&pinfo->base);

	return 0;
}

static int nt36672a_panel_probe(struct mipi_dsi_device *dsi)
{
	struct nt36672a_panel *pinfo;
	const struct nt36672a_panel_desc *desc;
	int err;

	pinfo = devm_kzalloc(&dsi->dev, sizeof(*pinfo), GFP_KERNEL);
	if (!pinfo)
		return -ENOMEM;

	desc = of_device_get_match_data(&dsi->dev);
	dsi->mode_flags = desc->mode_flags;
	dsi->format = desc->format;
	dsi->lanes = desc->lanes;
	pinfo->desc = desc;
	pinfo->link = dsi;

	mipi_dsi_set_drvdata(dsi, pinfo);

	err = nt36672a_panel_add(pinfo);
	if (err < 0)
		return err;

	err = mipi_dsi_attach(dsi);
	if (err < 0) {
		drm_panel_remove(&pinfo->base);
		return err;
	}

	return 0;
}

static void nt36672a_panel_remove(struct mipi_dsi_device *dsi)
{
	struct nt36672a_panel *pinfo = mipi_dsi_get_drvdata(dsi);
	int err;

	err = drm_panel_unprepare(&pinfo->base);
	if (err < 0)
		dev_err(&dsi->dev, "failed to unprepare panel: %d\n", err);

	err = drm_panel_disable(&pinfo->base);
	if (err < 0)
		dev_err(&dsi->dev, "failed to disable panel: %d\n", err);

	err = mipi_dsi_detach(dsi);
	if (err < 0)
		dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", err);

	drm_panel_remove(&pinfo->base);
}

static void nt36672a_panel_shutdown(struct mipi_dsi_device *dsi)
{
	struct nt36672a_panel *pinfo = mipi_dsi_get_drvdata(dsi);

	drm_panel_disable(&pinfo->base);
	drm_panel_unprepare(&pinfo->base);
}

static const struct of_device_id tianma_fhd_video_of_match[] = {
	{ .compatible = "tianma,fhd-video", .data = &tianma_fhd_video_panel_desc },
	{ },
};
MODULE_DEVICE_TABLE(of, tianma_fhd_video_of_match);

static struct mipi_dsi_driver nt36672a_panel_driver = {
	.driver = {
		.name = "panel-tianma-nt36672a",
		.of_match_table = tianma_fhd_video_of_match,
	},
	.probe = nt36672a_panel_probe,
	.remove = nt36672a_panel_remove,
	.shutdown = nt36672a_panel_shutdown,
};
module_mipi_dsi_driver(nt36672a_panel_driver);

MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");
MODULE_DESCRIPTION("NOVATEK NT36672A based MIPI-DSI LCD panel driver");
MODULE_LICENSE("GPL");