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From:   Sumit Semwal <sumit.semwal@linaro.org>
To:     Thierry Reding <thierry.reding@gmail.com>,
        Sam Ravnborg <sam@ravnborg.org>
Cc:     David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
        Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
        "David S . Miller" <davem@davemloft.net>,
        Rob Herring <robh@kernel.org>, linux-kernel@vger.kernel.org,
        dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Sumit Semwal <sumit.semwal@linaro.org>,
        Benni Steini <bennisteinir@gmail.com>
Subject: [PATCH v4 2/2] drm: panel: Add tianma nt36672a panel driver
Date:   Tue, 11 Aug 2020 23:51:07 +0530
Message-Id: <20200811182107.6515-3-sumit.semwal@linaro.org>
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Some Poco F1 phones have an LCD panel from Tianma, model nt36672a,
with a resolution of 1080x2246 that operates in DSI video mode.

Add the drm panel driver for it.

During testing, Benni Steini <bennisteinir@gmail.com> helped us fix
the reset sequence timing (from 10ms to 20ms), to get the bootanimation
to work on Android.

With current AOSP, we need to increase it to 200ms - this seems to be a
safe high value to avoid a white screen occasionally.

Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Benni Steini <bennisteinir@gmail.com>

---
v2: increase reset sequence timing to a safe 200ms
v4: Since "0425662fdf05: drm: Nuke mode->vrefresh", we have to calculate
    vrefresh on demand. Update for it.
---
 MAINTAINERS                                   |   7 +
 drivers/gpu/drm/panel/Kconfig                 |  11 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 drivers/gpu/drm/panel/panel-tianma-nt36672a.c | 858 ++++++++++++++++++
 4 files changed, 877 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-tianma-nt36672a.c

diff --git a/MAINTAINERS b/MAINTAINERS
index f77df02e4121..9e4bc8da9b2d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5611,6 +5611,13 @@ T:	git git://anongit.freedesktop.org/drm/drm-misc
 F:	Documentation/devicetree/bindings/display/ste,mcde.txt
 F:	drivers/gpu/drm/mcde/
 
+DRM DRIVER FOR TIANMA NT36672A PANELS
+M:	Sumit Semwal <sumit.semwal@linaro.org>
+S:	Maintained
+T:	git git://anongit.freedesktop.org/drm/drm-misc
+F:	Documentation/devicetree/bindings/display/panel/tianma,nt36672a-panel.yaml
+F:	drivers/gpu/drm/panel/panel-tianma-nt36672a.c
+
 DRM DRIVER FOR TDFX VIDEO CARDS
 S:	Orphan / Obsolete
 F:	drivers/gpu/drm/tdfx/
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index de2f2a452be5..8108a682dcb0 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -437,6 +437,17 @@ config DRM_PANEL_TPO_TD043MTEA1
 	  Say Y here if you want to enable support for TPO TD043MTEA1 800x480
 	  4.3" panel (found on the OMAP3 Pandora board).
 
+config DRM_PANEL_TIANMA_FHD_NT36672A
+	tristate "TIANMA NT36672A panel"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
+	help
+	  Say Y here if you want to enable support for the Tianma NT36672A
+	  panel. It is seen mostly in Xiaomi Poco F1 mobile phone.
+	  The panel has a 1080x2246 resolution and uses 24 bit RGB per pixel.
+	  It provides a MIPI DSI interface to the host.
+
 config DRM_PANEL_TPO_TPG110
 	tristate "TPO TPG 800x400 panel"
 	depends on OF && SPI && GPIOLIB
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index e45ceac6286f..472ae9ba8788 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -44,6 +44,7 @@ obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7703) += panel-sitronix-st7703.o
 obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7789V) += panel-sitronix-st7789v.o
 obj-$(CONFIG_DRM_PANEL_SONY_ACX424AKP) += panel-sony-acx424akp.o
 obj-$(CONFIG_DRM_PANEL_SONY_ACX565AKM) += panel-sony-acx565akm.o
+obj-$(CONFIG_DRM_PANEL_TIANMA_FHD_NT36672A) += panel-tianma-nt36672a.o
 obj-$(CONFIG_DRM_PANEL_TPO_TD028TTEC1) += panel-tpo-td028ttec1.o
 obj-$(CONFIG_DRM_PANEL_TPO_TD043MTEA1) += panel-tpo-td043mtea1.o
 obj-$(CONFIG_DRM_PANEL_TPO_TPG110) += panel-tpo-tpg110.o
diff --git a/drivers/gpu/drm/panel/panel-tianma-nt36672a.c b/drivers/gpu/drm/panel/panel-tianma-nt36672a.c
new file mode 100644
index 000000000000..2941975e039c
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-tianma-nt36672a.c
@@ -0,0 +1,858 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 Linaro Ltd
+ * Author: Sumit Semwal <sumit.semwal@linaro.org>
+ */
+
+#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 <drm/drm_print.h>
+
+#include <video/mipi_display.h>
+
+struct panel_cmd {
+	size_t len;
+	const char *data;
+};
+
+#define _INIT_CMD(...) { \
+	.len = sizeof((char[]){__VA_ARGS__}), \
+	.data = (char[]){__VA_ARGS__} }
+
+static const char * const regulator_names[] = {
+	"vddio",
+	"vddpos",
+	"vddneg",
+};
+
+static unsigned long const regulator_enable_loads[] = {
+	62000,
+	100000,
+	100000
+};
+
+static unsigned long const regulator_disable_loads[] = {
+	80,
+	100,
+	100
+};
+
+struct 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;
+
+	const struct panel_cmd *on_cmds_1;
+	const struct panel_cmd *on_cmds_2;
+
+	const struct panel_cmd *off_cmds;
+};
+
+struct panel_info {
+	struct drm_panel base;
+	struct mipi_dsi_device *link;
+	const struct panel_desc *desc;
+
+	struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
+
+	struct gpio_desc *reset_gpio;
+
+	struct pinctrl *pinctrl;
+	struct pinctrl_state *active;
+	struct pinctrl_state *suspend;
+
+
+	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 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;
+
+	if (!cmds)
+		return -EFAULT;
+
+	for (i = 0; cmds[i].len != 0; i++) {
+		const struct panel_cmd *cmd = &cmds[i];
+
+		if (cmd->len == 2)
+			err = mipi_dsi_dcs_write(pinfo->link,
+						    cmd->data[1], NULL, 0);
+		else
+			err = mipi_dsi_dcs_write(pinfo->link,
+						    cmd->data[1], cmd->data + 2,
+						    cmd->len - 2);
+
+		if (err < 0)
+			return err;
+
+	}
+
+	return 0;
+}
+
+static int panel_set_pinctrl_state(struct panel_info *panel, bool enable)
+{
+	int rc = 0;
+	struct pinctrl_state *state;
+
+	if (enable)
+		state = panel->active;
+	else
+		state = panel->suspend;
+
+	rc = pinctrl_select_state(panel->pinctrl, state);
+	if (rc)
+		pr_err("[%s] failed to set pin state, rc=%d\n", panel->desc->panel_name,
+			rc);
+	return rc;
+}
+
+static int tianma_panel_disable(struct drm_panel *panel)
+{
+	struct panel_info *pinfo = to_panel_info(panel);
+
+	pinfo->enabled = false;
+
+	return 0;
+}
+
+static int tianma_panel_power_off(struct drm_panel *panel)
+{
+	struct panel_info *pinfo = to_panel_info(panel);
+	int i, ret = 0;
+
+	gpiod_set_value(pinfo->reset_gpio, 0);
+
+	ret = panel_set_pinctrl_state(pinfo, false);
+	if (ret) {
+		pr_err("[%s] failed to set pinctrl, rc=%d\n", pinfo->desc->panel_name, ret);
+		return ret;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(pinfo->supplies); i++) {
+		ret = regulator_set_load(pinfo->supplies[i].consumer,
+				regulator_disable_loads[i]);
+		if (ret) {
+			DRM_DEV_ERROR(panel->dev,
+				"regulator_set_load failed %d\n", ret);
+			return ret;
+		}
+	}
+
+	ret = regulator_bulk_disable(ARRAY_SIZE(pinfo->supplies), pinfo->supplies);
+	if (ret) {
+		DRM_DEV_ERROR(panel->dev,
+			"regulator_bulk_disable failed %d\n", ret);
+	}
+	return ret;
+}
+
+static int tianma_panel_unprepare(struct drm_panel *panel)
+{
+	struct panel_info *pinfo = to_panel_info(panel);
+	int ret;
+
+	if (!pinfo->prepared)
+		return 0;
+
+	/* send off cmds */
+	ret = send_mipi_cmds(panel, pinfo->desc->off_cmds);
+
+	if (ret < 0) {
+		DRM_DEV_ERROR(panel->dev,
+				"failed to send DCS off cmds: %d\n", ret);
+	}
+
+	ret = mipi_dsi_dcs_set_display_off(pinfo->link);
+	if (ret < 0) {
+		DRM_DEV_ERROR(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) {
+		DRM_DEV_ERROR(panel->dev,
+			"enter_sleep cmd failed ret = %d\n", ret);
+	}
+	/* 0x3C = 60ms delay */
+	msleep(60);
+
+	ret = tianma_panel_power_off(panel);
+	if (ret < 0)
+		DRM_DEV_ERROR(panel->dev, "power_off failed ret = %d\n", ret);
+
+	pinfo->prepared = false;
+
+	return ret;
+
+}
+
+static int tianma_panel_power_on(struct panel_info *pinfo)
+{
+	int ret, i;
+
+	for (i = 0; i < ARRAY_SIZE(pinfo->supplies); i++) {
+		ret = regulator_set_load(pinfo->supplies[i].consumer,
+					regulator_enable_loads[i]);
+		if (ret)
+			return ret;
+	}
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(pinfo->supplies), pinfo->supplies);
+	if (ret < 0)
+		return ret;
+
+	ret = panel_set_pinctrl_state(pinfo, true);
+	if (ret) {
+		pr_err("[%s] failed to set pinctrl, rc=%d\n", pinfo->desc->panel_name, ret);
+		return ret;
+	}
+
+	/*
+	 * As per downstream kernel, Reset sequence of Tianma nt36672a 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, 0);
+	msleep(200);
+	gpiod_set_value(pinfo->reset_gpio, 1);
+	msleep(200);
+
+	return 0;
+}
+
+static int tianma_panel_prepare(struct drm_panel *panel)
+{
+	struct panel_info *pinfo = to_panel_info(panel);
+	int err;
+
+	if (pinfo->prepared)
+		return 0;
+
+	err = tianma_panel_power_on(pinfo);
+	if (err < 0)
+		goto poweroff;
+
+	/* send first part of init cmds */
+	err = send_mipi_cmds(panel, pinfo->desc->on_cmds_1);
+
+	if (err < 0) {
+		DRM_DEV_ERROR(panel->dev,
+				"failed to send DCS Init 1st Code: %d\n", err);
+		goto poweroff;
+	}
+
+	err = mipi_dsi_dcs_set_display_on(pinfo->link);
+	if (err < 0) {
+		DRM_DEV_ERROR(panel->dev,
+				"failed to Set Display ON: %d\n", err);
+		goto poweroff;
+	}
+
+	err = mipi_dsi_dcs_exit_sleep_mode(pinfo->link);
+	if (err < 0) {
+		DRM_DEV_ERROR(panel->dev, "failed to exit sleep mode: %d\n",
+			      err);
+		goto poweroff;
+	}
+	/* 0x46 = 70 ms delay */
+	msleep(70);
+
+	/* Send rest of the init cmds */
+	err = send_mipi_cmds(panel, pinfo->desc->on_cmds_2);
+
+	if (err < 0) {
+		DRM_DEV_ERROR(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, 1);
+	return err;
+}
+
+
+static int tianma_panel_enable(struct drm_panel *panel)
+{
+	struct panel_info *pinfo = to_panel_info(panel);
+
+	if (pinfo->enabled)
+		return 0;
+
+	pinfo->enabled = true;
+
+	return 0;
+}
+
+static int tianma_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->dev, m);
+	if (!mode) {
+		DRM_DEV_ERROR(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 = {
+	.disable = tianma_panel_disable,
+	.unprepare = tianma_panel_unprepare,
+	.prepare = tianma_panel_prepare,
+	.enable = tianma_panel_enable,
+	.get_modes = tianma_panel_get_modes,
+};
+
+static const struct panel_cmd tianma_nt36672a_on_cmds_1[] = {
+	/* skin enhancement mode */
+	_INIT_CMD(0x00, 0xFF, 0x22),
+	_INIT_CMD(0x00, 0x00, 0x40),
+	_INIT_CMD(0x00, 0x01, 0xC0),
+	_INIT_CMD(0x00, 0x02, 0x40),
+	_INIT_CMD(0x00, 0x03, 0x40),
+	_INIT_CMD(0x00, 0x04, 0x40),
+	_INIT_CMD(0x00, 0x05, 0x40),
+	_INIT_CMD(0x00, 0x06, 0x40),
+	_INIT_CMD(0x00, 0x07, 0x40),
+	_INIT_CMD(0x00, 0x08, 0x40),
+	_INIT_CMD(0x00, 0x09, 0x40),
+	_INIT_CMD(0x00, 0x0A, 0x40),
+	_INIT_CMD(0x00, 0x0B, 0x40),
+	_INIT_CMD(0x00, 0x0C, 0x40),
+	_INIT_CMD(0x00, 0x0D, 0x40),
+	_INIT_CMD(0x00, 0x0E, 0x40),
+	_INIT_CMD(0x00, 0x0F, 0x40),
+	_INIT_CMD(0x00, 0x10, 0x40),
+	_INIT_CMD(0x00, 0x11, 0x50),
+	_INIT_CMD(0x00, 0x12, 0x60),
+	_INIT_CMD(0x00, 0x13, 0x70),
+	_INIT_CMD(0x00, 0x14, 0x58),
+	_INIT_CMD(0x00, 0x15, 0x68),
+	_INIT_CMD(0x00, 0x16, 0x78),
+	_INIT_CMD(0x00, 0x17, 0x77),
+	_INIT_CMD(0x00, 0x18, 0x39),
+	_INIT_CMD(0x00, 0x19, 0x2D),
+	_INIT_CMD(0x00, 0x1A, 0x2E),
+	_INIT_CMD(0x00, 0x1B, 0x32),
+	_INIT_CMD(0x00, 0x1C, 0x37),
+	_INIT_CMD(0x00, 0x1D, 0x3A),
+	_INIT_CMD(0x00, 0x1E, 0x40),
+	_INIT_CMD(0x00, 0x1F, 0x40),
+	_INIT_CMD(0x00, 0x20, 0x40),
+	_INIT_CMD(0x00, 0x21, 0x40),
+	_INIT_CMD(0x00, 0x22, 0x40),
+	_INIT_CMD(0x00, 0x23, 0x40),
+	_INIT_CMD(0x00, 0x24, 0x40),
+	_INIT_CMD(0x00, 0x25, 0x40),
+	_INIT_CMD(0x00, 0x26, 0x40),
+	_INIT_CMD(0x00, 0x27, 0x40),
+	_INIT_CMD(0x00, 0x28, 0x40),
+	_INIT_CMD(0x00, 0x2D, 0x00),
+	_INIT_CMD(0x00, 0x2F, 0x40),
+	_INIT_CMD(0x00, 0x30, 0x40),
+	_INIT_CMD(0x00, 0x31, 0x40),
+	_INIT_CMD(0x00, 0x32, 0x40),
+	_INIT_CMD(0x00, 0x33, 0x40),
+	_INIT_CMD(0x00, 0x34, 0x40),
+	_INIT_CMD(0x00, 0x35, 0x40),
+	_INIT_CMD(0x00, 0x36, 0x40),
+	_INIT_CMD(0x00, 0x37, 0x40),
+	_INIT_CMD(0x00, 0x38, 0x40),
+	_INIT_CMD(0x00, 0x39, 0x40),
+	_INIT_CMD(0x00, 0x3A, 0x40),
+	_INIT_CMD(0x00, 0x3B, 0x40),
+	_INIT_CMD(0x00, 0x3D, 0x40),
+	_INIT_CMD(0x00, 0x3F, 0x40),
+	_INIT_CMD(0x00, 0x40, 0x40),
+	_INIT_CMD(0x00, 0x41, 0x40),
+	_INIT_CMD(0x00, 0x42, 0x40),
+	_INIT_CMD(0x00, 0x43, 0x40),
+	_INIT_CMD(0x00, 0x44, 0x40),
+	_INIT_CMD(0x00, 0x45, 0x40),
+	_INIT_CMD(0x00, 0x46, 0x40),
+	_INIT_CMD(0x00, 0x47, 0x40),
+	_INIT_CMD(0x00, 0x48, 0x40),
+	_INIT_CMD(0x00, 0x49, 0x40),
+	_INIT_CMD(0x00, 0x4A, 0x40),
+	_INIT_CMD(0x00, 0x4B, 0x40),
+	_INIT_CMD(0x00, 0x4C, 0x40),
+	_INIT_CMD(0x00, 0x4D, 0x40),
+	_INIT_CMD(0x00, 0x4E, 0x40),
+	_INIT_CMD(0x00, 0x4F, 0x40),
+	_INIT_CMD(0x00, 0x50, 0x40),
+	_INIT_CMD(0x00, 0x51, 0x40),
+	_INIT_CMD(0x00, 0x52, 0x40),
+	_INIT_CMD(0x00, 0x53, 0x01),
+	_INIT_CMD(0x00, 0x54, 0x01),
+	_INIT_CMD(0x00, 0x55, 0xFE),
+	_INIT_CMD(0x00, 0x56, 0x77),
+	_INIT_CMD(0x00, 0x58, 0xCD),
+	_INIT_CMD(0x00, 0x59, 0xD0),
+	_INIT_CMD(0x00, 0x5A, 0xD0),
+	_INIT_CMD(0x00, 0x5B, 0x50),
+	_INIT_CMD(0x00, 0x5C, 0x50),
+	_INIT_CMD(0x00, 0x5D, 0x50),
+	_INIT_CMD(0x00, 0x5E, 0x50),
+	_INIT_CMD(0x00, 0x5F, 0x50),
+	_INIT_CMD(0x00, 0x60, 0x50),
+	_INIT_CMD(0x00, 0x61, 0x50),
+	_INIT_CMD(0x00, 0x62, 0x50),
+	_INIT_CMD(0x00, 0x63, 0x50),
+	_INIT_CMD(0x00, 0x64, 0x50),
+	_INIT_CMD(0x00, 0x65, 0x50),
+	_INIT_CMD(0x00, 0x66, 0x50),
+	_INIT_CMD(0x00, 0x67, 0x50),
+	_INIT_CMD(0x00, 0x68, 0x50),
+	_INIT_CMD(0x00, 0x69, 0x50),
+	_INIT_CMD(0x00, 0x6A, 0x50),
+	_INIT_CMD(0x00, 0x6B, 0x50),
+	_INIT_CMD(0x00, 0x6C, 0x50),
+	_INIT_CMD(0x00, 0x6D, 0x50),
+	_INIT_CMD(0x00, 0x6E, 0x50),
+	_INIT_CMD(0x00, 0x6F, 0x50),
+	_INIT_CMD(0x00, 0x70, 0x07),
+	_INIT_CMD(0x00, 0x71, 0x00),
+	_INIT_CMD(0x00, 0x72, 0x00),
+	_INIT_CMD(0x00, 0x73, 0x00),
+	_INIT_CMD(0x00, 0x74, 0x06),
+	_INIT_CMD(0x00, 0x75, 0x0C),
+	_INIT_CMD(0x00, 0x76, 0x03),
+	_INIT_CMD(0x00, 0x77, 0x09),
+	_INIT_CMD(0x00, 0x78, 0x0F),
+	_INIT_CMD(0x00, 0x79, 0x68),
+	_INIT_CMD(0x00, 0x7A, 0x88),
+	_INIT_CMD(0x00, 0x7C, 0x80),
+	_INIT_CMD(0x00, 0x7D, 0x80),
+	_INIT_CMD(0x00, 0x7E, 0x80),
+	_INIT_CMD(0x00, 0x7F, 0x00),
+	_INIT_CMD(0x00, 0x80, 0x00),
+	_INIT_CMD(0x00, 0x81, 0x00),
+	_INIT_CMD(0x00, 0x83, 0x01),
+	_INIT_CMD(0x00, 0x84, 0x00),
+	_INIT_CMD(0x00, 0x85, 0x80),
+	_INIT_CMD(0x00, 0x86, 0x80),
+	_INIT_CMD(0x00, 0x87, 0x80),
+	_INIT_CMD(0x00, 0x88, 0x40),
+	_INIT_CMD(0x00, 0x89, 0x91),
+	_INIT_CMD(0x00, 0x8A, 0x98),
+	_INIT_CMD(0x00, 0x8B, 0x80),
+	_INIT_CMD(0x00, 0x8C, 0x80),
+	_INIT_CMD(0x00, 0x8D, 0x80),
+	_INIT_CMD(0x00, 0x8E, 0x80),
+	_INIT_CMD(0x00, 0x8F, 0x80),
+	_INIT_CMD(0x00, 0x90, 0x80),
+	_INIT_CMD(0x00, 0x91, 0x80),
+	_INIT_CMD(0x00, 0x92, 0x80),
+	_INIT_CMD(0x00, 0x93, 0x80),
+	_INIT_CMD(0x00, 0x94, 0x80),
+	_INIT_CMD(0x00, 0x95, 0x80),
+	_INIT_CMD(0x00, 0x96, 0x80),
+	_INIT_CMD(0x00, 0x97, 0x80),
+	_INIT_CMD(0x00, 0x98, 0x80),
+	_INIT_CMD(0x00, 0x99, 0x80),
+	_INIT_CMD(0x00, 0x9A, 0x80),
+	_INIT_CMD(0x00, 0x9B, 0x80),
+	_INIT_CMD(0x00, 0x9C, 0x80),
+	_INIT_CMD(0x00, 0x9D, 0x80),
+	_INIT_CMD(0x00, 0x9E, 0x80),
+	_INIT_CMD(0x00, 0x9F, 0x80),
+	_INIT_CMD(0x00, 0xA0, 0x8A),
+	_INIT_CMD(0x00, 0xA2, 0x80),
+	_INIT_CMD(0x00, 0xA6, 0x80),
+	_INIT_CMD(0x00, 0xA7, 0x80),
+	_INIT_CMD(0x00, 0xA9, 0x80),
+	_INIT_CMD(0x00, 0xAA, 0x80),
+	_INIT_CMD(0x00, 0xAB, 0x80),
+	_INIT_CMD(0x00, 0xAC, 0x80),
+	_INIT_CMD(0x00, 0xAD, 0x80),
+	_INIT_CMD(0x00, 0xAE, 0x80),
+	_INIT_CMD(0x00, 0xAF, 0x80),
+	_INIT_CMD(0x00, 0xB7, 0x76),
+	_INIT_CMD(0x00, 0xB8, 0x76),
+	_INIT_CMD(0x00, 0xB9, 0x05),
+	_INIT_CMD(0x00, 0xBA, 0x0D),
+	_INIT_CMD(0x00, 0xBB, 0x14),
+	_INIT_CMD(0x00, 0xBC, 0x0F),
+	_INIT_CMD(0x00, 0xBD, 0x18),
+	_INIT_CMD(0x00, 0xBE, 0x1F),
+	_INIT_CMD(0x00, 0xBF, 0x05),
+	_INIT_CMD(0x00, 0xC0, 0x0D),
+	_INIT_CMD(0x00, 0xC1, 0x14),
+	_INIT_CMD(0x00, 0xC2, 0x03),
+	_INIT_CMD(0x00, 0xC3, 0x07),
+	_INIT_CMD(0x00, 0xC4, 0x0A),
+	_INIT_CMD(0x00, 0xC5, 0xA0),
+	_INIT_CMD(0x00, 0xC6, 0x55),
+	_INIT_CMD(0x00, 0xC7, 0xFF),
+	_INIT_CMD(0x00, 0xC8, 0x39),
+	_INIT_CMD(0x00, 0xC9, 0x44),
+	_INIT_CMD(0x00, 0xCA, 0x12),
+	_INIT_CMD(0x00, 0xCD, 0x80),
+	_INIT_CMD(0x00, 0xDB, 0x80),
+	_INIT_CMD(0x00, 0xDC, 0x80),
+	_INIT_CMD(0x00, 0xDD, 0x80),
+	_INIT_CMD(0x00, 0xE0, 0x80),
+	_INIT_CMD(0x00, 0xE1, 0x80),
+	_INIT_CMD(0x00, 0xE2, 0x80),
+	_INIT_CMD(0x00, 0xE3, 0x80),
+	_INIT_CMD(0x00, 0xE4, 0x80),
+	_INIT_CMD(0x00, 0xE5, 0x40),
+	_INIT_CMD(0x00, 0xE6, 0x40),
+	_INIT_CMD(0x00, 0xE7, 0x40),
+	_INIT_CMD(0x00, 0xE8, 0x40),
+	_INIT_CMD(0x00, 0xE9, 0x40),
+	_INIT_CMD(0x00, 0xEA, 0x40),
+	_INIT_CMD(0x00, 0xEB, 0x40),
+	_INIT_CMD(0x00, 0xEC, 0x40),
+	_INIT_CMD(0x00, 0xED, 0x40),
+	_INIT_CMD(0x00, 0xEE, 0x40),
+	_INIT_CMD(0x00, 0xEF, 0x40),
+	_INIT_CMD(0x00, 0xF0, 0x40),
+	_INIT_CMD(0x00, 0xF1, 0x40),
+	_INIT_CMD(0x00, 0xF2, 0x40),
+	_INIT_CMD(0x00, 0xF3, 0x40),
+	_INIT_CMD(0x00, 0xF4, 0x40),
+	_INIT_CMD(0x00, 0xF5, 0x40),
+	_INIT_CMD(0x00, 0xF6, 0x40),
+	_INIT_CMD(0x00, 0xFB, 0x1),
+	_INIT_CMD(0x00, 0xFF, 0x23),
+	_INIT_CMD(0x00, 0xFB, 0x01),
+	/* dimming enable */
+	_INIT_CMD(0x00, 0x01, 0x84),
+	_INIT_CMD(0x00, 0x05, 0x2D),
+	_INIT_CMD(0x00, 0x06, 0x00),
+	 /* resolution 1080*2246 */
+	_INIT_CMD(0x00, 0x11, 0x01),
+	_INIT_CMD(0x00, 0x12, 0x7B),
+	_INIT_CMD(0x00, 0x15, 0x6F),
+	_INIT_CMD(0x00, 0x16, 0x0B),
+	 /* UI mode */
+	_INIT_CMD(0x00, 0x29, 0x0A),
+	_INIT_CMD(0x00, 0x30, 0xFF),
+	_INIT_CMD(0x00, 0x31, 0xFF),
+	_INIT_CMD(0x00, 0x32, 0xFF),
+	_INIT_CMD(0x00, 0x33, 0xFF),
+	_INIT_CMD(0x00, 0x34, 0xFF),
+	_INIT_CMD(0x00, 0x35, 0xFF),
+	_INIT_CMD(0x00, 0x36, 0xFF),
+	_INIT_CMD(0x00, 0x37, 0xFF),
+	_INIT_CMD(0x00, 0x38, 0xFC),
+	_INIT_CMD(0x00, 0x39, 0xF8),
+	_INIT_CMD(0x00, 0x3A, 0xF4),
+	_INIT_CMD(0x00, 0x3B, 0xF1),
+	_INIT_CMD(0x00, 0x3D, 0xEE),
+	_INIT_CMD(0x00, 0x3F, 0xEB),
+	_INIT_CMD(0x00, 0x40, 0xE8),
+	_INIT_CMD(0x00, 0x41, 0xE5),
+	 /* STILL mode */
+	_INIT_CMD(0x00, 0x2A, 0x13),
+	_INIT_CMD(0x00, 0x45, 0xFF),
+	_INIT_CMD(0x00, 0x46, 0xFF),
+	_INIT_CMD(0x00, 0x47, 0xFF),
+	_INIT_CMD(0x00, 0x48, 0xFF),
+	_INIT_CMD(0x00, 0x49, 0xFF),
+	_INIT_CMD(0x00, 0x4A, 0xFF),
+	_INIT_CMD(0x00, 0x4B, 0xFF),
+	_INIT_CMD(0x00, 0x4C, 0xFF),
+	_INIT_CMD(0x00, 0x4D, 0xED),
+	_INIT_CMD(0x00, 0x4E, 0xD5),
+	_INIT_CMD(0x00, 0x4F, 0xBF),
+	_INIT_CMD(0x00, 0x50, 0xA6),
+	_INIT_CMD(0x00, 0x51, 0x96),
+	_INIT_CMD(0x00, 0x52, 0x86),
+	_INIT_CMD(0x00, 0x53, 0x76),
+	_INIT_CMD(0x00, 0x54, 0x66),
+	 /* MOVING mode */
+	_INIT_CMD(0x00, 0x2B, 0x0E),
+	_INIT_CMD(0x00, 0x58, 0xFF),
+	_INIT_CMD(0x00, 0x59, 0xFF),
+	_INIT_CMD(0x00, 0x5A, 0xFF),
+	_INIT_CMD(0x00, 0x5B, 0xFF),
+	_INIT_CMD(0x00, 0x5C, 0xFF),
+	_INIT_CMD(0x00, 0x5D, 0xFF),
+	_INIT_CMD(0x00, 0x5E, 0xFF),
+	_INIT_CMD(0x00, 0x5F, 0xFF),
+	_INIT_CMD(0x00, 0x60, 0xF6),
+	_INIT_CMD(0x00, 0x61, 0xEA),
+	_INIT_CMD(0x00, 0x62, 0xE1),
+	_INIT_CMD(0x00, 0x63, 0xD8),
+	_INIT_CMD(0x00, 0x64, 0xCE),
+	_INIT_CMD(0x00, 0x65, 0xC3),
+	_INIT_CMD(0x00, 0x66, 0xBA),
+	_INIT_CMD(0x00, 0x67, 0xB3),
+	_INIT_CMD(0x00, 0xFF, 0x25),
+	_INIT_CMD(0x00, 0xFB, 0x01),
+	_INIT_CMD(0x00, 0x05, 0x04),
+	_INIT_CMD(0x00, 0xFF, 0x26),
+	_INIT_CMD(0x00, 0xFB, 0x01),
+	_INIT_CMD(0x00, 0x1C, 0xAF),
+	_INIT_CMD(0x00, 0xFF, 0x10),
+	_INIT_CMD(0x00, 0xFB, 0x01),
+	_INIT_CMD(0x00, 0x51, 0xFF),
+	_INIT_CMD(0x00, 0x53, 0x24),
+	_INIT_CMD(0x00, 0x55, 0x00),
+
+	{},
+};
+
+static const struct panel_cmd tianma_nt36672a_on_cmds_2[] = {
+	_INIT_CMD(0x00, 0xFF, 0x24),
+	_INIT_CMD(0x00, 0xFB, 0x01),
+	_INIT_CMD(0x00, 0xC3, 0x01),
+	_INIT_CMD(0x00, 0xC4, 0x54),
+	_INIT_CMD(0x00, 0xFF, 0x10),
+
+	{},
+};
+
+static const struct panel_cmd tianma_nt36672a_off_cmds[] = {
+	_INIT_CMD(0x00, 0xFF, 0x24),
+	_INIT_CMD(0x00, 0xFB, 0x01),
+	_INIT_CMD(0x00, 0xC3, 0x01),
+	_INIT_CMD(0x00, 0xFF, 0x10),
+
+	{},
+};
+
+static const struct drm_display_mode tianma_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 panel_desc tianma_panel_desc = {
+	.display_mode = &tianma_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_nt36672a_on_cmds_1,
+	.on_cmds_2 = tianma_nt36672a_on_cmds_2,
+	.off_cmds = tianma_nt36672a_off_cmds
+};
+
+
+static const struct of_device_id panel_of_match[] = {
+	{ .compatible = "tianma,nt36672a",
+	  .data = &tianma_panel_desc
+	},
+	{
+		/* sentinel */
+	}
+};
+MODULE_DEVICE_TABLE(of, panel_of_match);
+
+
+static int panel_pinctrl_init(struct panel_info *panel)
+{
+	struct device *dev = &panel->link->dev;
+	int rc = 0;
+
+	panel->pinctrl = devm_pinctrl_get(dev);
+	if (IS_ERR_OR_NULL(panel->pinctrl)) {
+		rc = PTR_ERR(panel->pinctrl);
+		pr_err("failed to get pinctrl, rc=%d\n", rc);
+		goto error;
+	}
+
+	panel->active = pinctrl_lookup_state(panel->pinctrl,
+							"panel_active");
+	if (IS_ERR_OR_NULL(panel->active)) {
+		rc = PTR_ERR(panel->active);
+		pr_err("failed to get pinctrl active state, rc=%d\n", rc);
+		goto error;
+	}
+
+	panel->suspend =
+		pinctrl_lookup_state(panel->pinctrl, "panel_suspend");
+
+	if (IS_ERR_OR_NULL(panel->suspend)) {
+		rc = PTR_ERR(panel->suspend);
+		pr_err("failed to get pinctrl suspend state, rc=%d\n", rc);
+		goto error;
+	}
+
+error:
+	return rc;
+}
+
+static int panel_add(struct panel_info *pinfo)
+{
+	struct device *dev = &pinfo->link->dev;
+	int i, ret;
+
+	for (i = 0; i < ARRAY_SIZE(pinfo->supplies); i++)
+		pinfo->supplies[i].supply = regulator_names[i];
+
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(pinfo->supplies),
+				      pinfo->supplies);
+	if (ret < 0)
+		return ret;
+
+	pinfo->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(pinfo->reset_gpio)) {
+		DRM_DEV_ERROR(dev, "cannot get reset gpio %ld\n",
+			PTR_ERR(pinfo->reset_gpio));
+		return PTR_ERR(pinfo->reset_gpio);
+	}
+
+	ret = panel_pinctrl_init(pinfo);
+	if (ret < 0)
+		return ret;
+
+	drm_panel_init(&pinfo->base, dev, &panel_funcs,
+		       DRM_MODE_CONNECTOR_DSI);
+
+	ret = drm_panel_add(&pinfo->base);
+	if (ret < 0)
+		return ret;
+	return 0;
+}
+
+static void panel_del(struct panel_info *pinfo)
+{
+	if (pinfo->base.dev)
+		drm_panel_remove(&pinfo->base);
+}
+
+static int panel_probe(struct mipi_dsi_device *dsi)
+{
+	struct panel_info *pinfo;
+	const struct 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 = panel_add(pinfo);
+	if (err < 0)
+		return err;
+
+	err = mipi_dsi_attach(dsi);
+	return err;
+}
+
+static int panel_remove(struct mipi_dsi_device *dsi)
+{
+	struct panel_info *pinfo = mipi_dsi_get_drvdata(dsi);
+	int err;
+
+	err = tianma_panel_unprepare(&pinfo->base);
+	if (err < 0)
+		DRM_DEV_ERROR(&dsi->dev, "failed to unprepare panel: %d\n",
+				err);
+
+	err = tianma_panel_disable(&pinfo->base);
+	if (err < 0)
+		DRM_DEV_ERROR(&dsi->dev, "failed to disable panel: %d\n", err);
+
+	err = mipi_dsi_detach(dsi);
+	if (err < 0)
+		DRM_DEV_ERROR(&dsi->dev, "failed to detach from DSI host: %d\n",
+				err);
+
+	drm_panel_detach(&pinfo->base);
+	panel_del(pinfo);
+
+	return 0;
+}
+
+static void panel_shutdown(struct mipi_dsi_device *dsi)
+{
+	struct panel_info *pinfo = mipi_dsi_get_drvdata(dsi);
+
+	tianma_panel_disable(&pinfo->base);
+	tianma_panel_unprepare(&pinfo->base);
+}
+
+static struct mipi_dsi_driver panel_driver = {
+	.driver = {
+		.name = "panel-tianma-nt36672a",
+		.of_match_table = panel_of_match,
+	},
+	.probe = panel_probe,
+	.remove = panel_remove,
+	.shutdown = panel_shutdown,
+};
+module_mipi_dsi_driver(panel_driver);
+
+MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");
+MODULE_DESCRIPTION("TIANMA NT36672A MIPI-DSI LCD panel");
+MODULE_LICENSE("GPL");
-- 
2.28.0