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 <bennistei...@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 occassionally.

Signed-off-by: Sumit Semwal <sumit.sem...@linaro.org>
Cc: Benni Steini <bennistei...@gmail.com>
Change-Id: Ib822ef12464abcb50d2e539d11b8983be87c31f2

---
v2: increase reset sequence timing to a safe 200ms
---
 MAINTAINERS                                   |   7 +
 drivers/gpu/drm/panel/Kconfig                 |  11 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 drivers/gpu/drm/panel/panel-tianma-nt36672a.c | 859 ++++++++++++++++++
 4 files changed, 878 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-tianma-nt36672a.c

diff --git a/MAINTAINERS b/MAINTAINERS
index b4a43a9e7fbc..2d384e51353b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5544,6 +5544,13 @@ 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.sem...@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 39055c1f0e2f..da9d74c1ec91 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 de74f282c433..303e44eb50fa 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -44,6 +44,7 @@ obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7701) += 
panel-sitronix-st7701.o
 obj-$(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..0af3a6ff5d55
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-tianma-nt36672a.c
@@ -0,0 +1,859 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 Linaro Ltd
+ * Author: Sumit Semwal <sumit.sem...@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, m->vrefresh);
+               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,
+       .vrefresh       = 60,
+
+       .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.sem...@linaro.org>");
+MODULE_DESCRIPTION("TIANMA NT36672A MIPI-DSI LCD panel");
+MODULE_LICENSE("GPL");
-- 
2.27.0

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