Date:   Mon, 30 Oct 2017 16:14:00 -0400
From:   MoreRobustThanYou <gameexpertnetwork@...il.com>
To:     gameexpertnetwork@...il.com
Cc:     Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        linux-kernel@...r.kernel.org (open list),
        dri-devel@...ts.freedesktop.org (open list:DRM PANEL DRIVERS)
Subject: [PATCH] Novatek NT71392QG panel support

---
 drivers/gpu/drm/panel/Kconfig                   |   9 +
 drivers/gpu/drm/panel/Makefile                  |   1 +
 drivers/gpu/drm/panel/panel-novatek-nt71392qg.c | 438 ++++++++++++++++++++++++
 3 files changed, 448 insertions(+)
 mode change 100644 => 100755 drivers/gpu/drm/panel/Kconfig
 mode change 100644 => 100755 drivers/gpu/drm/panel/Makefile
 create mode 100755 drivers/gpu/drm/panel/panel-novatek-nt71392qg.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
old mode 100644
new mode 100755
index 726f3fb..069373a
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -150,4 +150,13 @@ config DRM_PANEL_SITRONIX_ST7789V
 	  Say Y here if you want to enable support for the Sitronix
 	  ST7789V controller for 240x320 LCD panels
 
+config DRM_PANEL_NOVATEK_NT71392QG
+	tristate "Novatek NT71392QG 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 Novatek
+	  NT71392QG controller for 1200x1920 LCD panel
+
 endmenu
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
old mode 100644
new mode 100755
index 77ede34..4d0e84f
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -14,3 +14,4 @@ obj-$(CONFIG_DRM_PANEL_SEIKO_43WVF1G) += panel-seiko-43wvf1g.o
 obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
 obj-$(CONFIG_DRM_PANEL_SHARP_LS043T1LE01) += panel-sharp-ls043t1le01.o
 obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7789V) += panel-sitronix-st7789v.o
+obj-$(CONFIG_DRM_PANEL_NOVATEK_NT71392QG) += panel-novatek-nt71392qg.o
\ No newline at end of file
diff --git a/drivers/gpu/drm/panel/panel-novatek-nt71392qg.c b/drivers/gpu/drm/panel/panel-novatek-nt71392qg.c
new file mode 100755
index 0000000..4d540e8
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-novatek-nt71392qg.c
@@ -0,0 +1,438 @@
+/*
+ * Copyright (C) 2015 Red Hat
+ * Author: steamport <gameexpertnetwork@...il.com>
+ * This is based off of Rob Clark's panel-lg-novatek-1080p-vid.c (thanks rob for your help!)
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/backlight.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_panel.h>
+
+#include <video/mipi_display.h>
+
+struct lg_panel {
+	struct drm_panel base;
+	struct mipi_dsi_device *dsi;
+
+	struct backlight_device *backlight;
+	struct regulator *supply;
+	struct gpio_desc *reset_gpio;
+
+	bool prepared;
+	bool enabled;
+
+	const struct drm_display_mode *mode;
+};
+
+static inline struct lg_panel *to_lg_panel(struct drm_panel *panel)
+{
+	return container_of(panel, struct lg_panel, base);
+}
+
+static int lg_panel_init(struct lg_panel *lg) //translated from https://github.com/LineageOS/android_kernel_amazon_hdx-common/blob/cm-14.1/arch/arm/boot/dts/dsi-panel-novatek-1080p-video.dtsi
+{
+	struct mipi_dsi_device *dsi = lg->dsi;
+	int ret;
+
+	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+		
+	msleep(5)
+	ret = mipi_dsi_turn_on_peripheral(dsi); /* peripheral on, change the delay from 100 to 5ms */
+	if (ret < 0)
+		return ret;
+	
+	ret = mipi_dsi_generic_short_write(dsi, (u8[]){0xf3, 0xa8}, 2); /* unlock page 8 */
+	if (ret < 0)
+		return ret;
+	
+	ret = mipi_dsi_generic_short_write(dsi, (u8[]){0x7a, 0x2b}, 2); /* 0x87a = 2b, this and below relate to garbage screen */
+	if (ret < 0)
+		return ret;
+	
+	ret = mipi_dsi_generic_short_write(dsi, (u8[]){0x7b, 0x63}, 2); /* 0x87b = 63 */
+	if (ret < 0)
+		return ret;
+	
+	ret = mipi_dsi_generic_short_write(dsi, (u8[]){0x7c, 0x0d}, 2); /* 0x87c = 0d */
+	if (ret < 0)
+		return ret;
+		
+	ret = mipi_dsi_generic_short_write(dsi, (u8[]){0x7e, 0x60}, 2); /* 0x87e = 60 */
+	if (ret < 0)
+		return ret;
+	
+	ret = mipi_dsi_generic_short_write(dsi, (u8[]){0x80, 0x00}, 2); /* 0x880 = 00 */
+	if (ret < 0)
+		return ret;
+	
+	ret = mipi_dsi_generic_short_write(dsi, (u8[]){0x81, 0x00}, 2); /* 0x881 = 00 */
+	if (ret < 0)
+		return ret;
+		
+	msleep(1)
+	ret = mipi_dsi_generic_short_write(dsi); /* lock page 8 */
+	if (ret < 0)
+		return ret;
+	
+	ret = mipi_dsi_generic_short_write(dsi, (u8[]){0xf3, 0xa1}, 2); /* unlock page 1 */
+	if (ret < 0)
+		return ret;
+	
+	ret = mipi_dsi_generic_short_write(dsi, (u8[]){0x53, 0x83}, 2); /* 0x153 = 80 */
+	if (ret < 0)
+		return ret;
+	return 0;
+	
+	msleep(1)
+	ret = mipi_dsi_generic_short_write(dsi); /* lock page 1 */
+	if (ret < 0)
+		return ret;
+}
+
+static int lg_panel_on(struct lg_panel *lg)
+{
+	struct mipi_dsi_device *dsi = lg->dsi;
+	int ret;
+
+	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	ret = mipi_dsi_dcs_set_display_on(dsi);
+	if (ret < 0)
+		return ret;
+
+	msleep(40);
+
+	return 0;
+}
+
+static int lg_panel_off(struct lg_panel *lg)
+{
+	struct mipi_dsi_device *dsi = lg->dsi;
+	int ret;
+
+	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+	ret = mipi_dsi_dcs_write(dsi, 0xff, (u8[]){ 0x10 }, 1);
+	if (ret < 0)
+		return ret;
+
+	ret = mipi_dsi_dcs_set_display_off(dsi);
+	if (ret < 0)
+		return ret;
+
+	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
+	if (ret < 0)
+		return ret;
+
+	msleep(100);
+
+	return 0;
+}
+
+static int lg_panel_disable(struct drm_panel *panel)
+{
+	struct lg_panel *lg = to_lg_panel(panel);
+
+	if (!lg->enabled)
+		return 0;
+
+	DRM_DEBUG("disable\n");
+
+	if (lg->backlight) {
+		lg->backlight->props.power = FB_BLANK_POWERDOWN;
+		backlight_update_status(lg->backlight);
+	}
+
+	lg->enabled = false;
+
+	return 0;
+}
+
+static int lg_panel_unprepare(struct drm_panel *panel)
+{
+	struct lg_panel *lg = to_lg_panel(panel);
+	int ret;
+
+	if (!lg->prepared)
+		return 0;
+
+	DRM_DEBUG("unprepare\n");
+
+	ret = lg_panel_off(lg);
+	if (ret) {
+		dev_err(panel->dev, "failed to set panel off: %d\n", ret);
+		return ret;
+	}
+
+	regulator_disable(lg->supply);
+	if (lg->reset_gpio)
+		gpiod_set_value(lg->reset_gpio, 0);
+
+	lg->prepared = false;
+
+	return 0;
+}
+
+static int lg_panel_prepare(struct drm_panel *panel)
+{
+	struct lg_panel *lg = to_lg_panel(panel);
+	int ret;
+
+	if (lg->prepared)
+		return 0;
+
+	DRM_DEBUG("prepare\n");
+
+	if (lg->reset_gpio) {
+		gpiod_set_value(lg->reset_gpio, 0);
+		msleep(5);
+	}
+
+	ret = regulator_enable(lg->supply);
+	if (ret < 0)
+		return ret;
+
+	msleep(20);
+
+	if (lg->reset_gpio) {
+		gpiod_set_value(lg->reset_gpio, 1);
+		msleep(10);
+	}
+
+	msleep(150);
+
+	ret = lg_panel_init(lg);
+	if (ret) {
+		dev_err(panel->dev, "failed to init panel: %d\n", ret);
+		goto poweroff;
+	}
+
+	ret = lg_panel_on(lg);
+	if (ret) {
+		dev_err(panel->dev, "failed to set panel on: %d\n", ret);
+		goto poweroff;
+	}
+
+	lg->prepared = true;
+
+	return 0;
+
+poweroff:
+	regulator_disable(lg->supply);
+	if (lg->reset_gpio)
+		gpiod_set_value(lg->reset_gpio, 0);
+	return ret;
+}
+
+static int lg_panel_enable(struct drm_panel *panel)
+{
+	struct lg_panel *lg = to_lg_panel(panel);
+
+	if (lg->enabled)
+		return 0;
+
+	DRM_DEBUG("enable\n");
+
+	if (lg->backlight) {
+		lg->backlight->props.power = FB_BLANK_UNBLANK;
+		backlight_update_status(lg->backlight);
+	}
+
+	lg->enabled = true;
+
+	return 0;
+}
+
+static const struct drm_display_mode default_mode = {
+		.clock = 165080,
+		.hdisplay = 1200,
+		.hsync_start = 1200 + 56,
+		.hsync_end = 1200 + 56 + 8,
+		.htotal = 1200 + 56 + 8 + 8,
+		.vdisplay = 1920,
+		.vsync_start = 1920 + 233,
+		.vsync_end = 1920 + 233 + 2,
+		.vtotal = 1920 + 233 + 2 + 8,
+		.vrefresh = 60,
+};
+
+static int lg_panel_get_modes(struct drm_panel *panel)
+{
+	struct drm_display_mode *mode;
+
+	mode = drm_mode_duplicate(panel->drm, &default_mode);
+	if (!mode) {
+		dev_err(panel->drm->dev, "failed to add mode %ux%ux@%u\n",
+				default_mode.hdisplay, default_mode.vdisplay,
+				default_mode.vrefresh);
+		return -ENOMEM;
+	}
+
+	drm_mode_set_name(mode);
+
+	drm_mode_probed_add(panel->connector, mode);
+
+	panel->connector->display_info.width_mm = 64;
+	panel->connector->display_info.height_mm = 114;
+
+	return 1;
+}
+
+static const struct drm_panel_funcs lg_panel_funcs = {
+		.disable = lg_panel_disable,
+		.unprepare = lg_panel_unprepare,
+		.prepare = lg_panel_prepare,
+		.enable = lg_panel_enable,
+		.get_modes = lg_panel_get_modes,
+};
+
+static const struct of_device_id lg_of_match[] = {
+		{ .compatible = "novatek,nt71392qg", },
+		{ }
+};
+MODULE_DEVICE_TABLE(of, lg_of_match);
+
+static int lg_panel_add(struct lg_panel *lg)
+{
+	struct device *dev= &lg->dsi->dev;
+	struct device_node *np;
+	int ret;
+
+	lg->mode = &default_mode;
+
+	lg->supply = devm_regulator_get(dev, "power");
+	if (IS_ERR(lg->supply))
+		return PTR_ERR(lg->supply);
+
+	lg->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(lg->reset_gpio)) {
+		dev_err(dev, "cannot get reset-gpios %ld\n",
+			PTR_ERR(lg->reset_gpio));
+		lg->reset_gpio = NULL;
+	} else {
+		gpiod_direction_output(lg->reset_gpio, 0);
+	}
+
+	np = of_parse_phandle(dev->of_node, "backlight", 0);
+	if (np) {
+		lg->backlight = of_find_backlight_by_node(np);
+		of_node_put(np);
+
+		if (!lg->backlight)
+			return -EPROBE_DEFER;
+	}
+
+	drm_panel_init(&lg->base);
+	lg->base.funcs = &lg_panel_funcs;
+	lg->base.dev = &lg->dsi->dev;
+
+	ret = drm_panel_add(&lg->base);
+	if (ret < 0)
+		goto put_backlight;
+
+	return 0;
+
+	put_backlight:
+	if (lg->backlight)
+		put_device(&lg->backlight->dev);
+
+	return ret;
+}
+
+static void lg_panel_del(struct lg_panel *lg)
+{
+	if (lg->base.dev)
+		drm_panel_remove(&lg->base);
+
+	if (lg->backlight)
+		put_device(&lg->backlight->dev);
+}
+
+static int lg_panel_probe(struct mipi_dsi_device *dsi)
+{
+	struct lg_panel *lg;
+	int ret;
+
+	dsi->lanes = 4;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
+			MIPI_DSI_MODE_VIDEO_HSE |
+			MIPI_DSI_CLOCK_NON_CONTINUOUS |
+			MIPI_DSI_MODE_EOT_PACKET;
+
+	lg = devm_kzalloc(&dsi->dev, sizeof(*lg), GFP_KERNEL);
+	if (!lg) {
+		return -ENOMEM;
+	}
+
+	mipi_dsi_set_drvdata(dsi, lg);
+
+	lg->dsi = dsi;
+
+	ret = lg_panel_add(lg);
+	if (ret < 0) {
+		return ret;
+	}
+
+	return mipi_dsi_attach(dsi);
+}
+
+static int lg_panel_remove(struct mipi_dsi_device *dsi)
+{
+	struct lg_panel *lg = mipi_dsi_get_drvdata(dsi);
+	int ret;
+
+	ret = lg_panel_disable(&lg->base);
+	if (ret < 0)
+		dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
+
+	ret = mipi_dsi_detach(dsi);
+	if (ret < 0)
+		dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
+
+	drm_panel_detach(&lg->base);
+	lg_panel_del(lg);
+
+	return 0;
+}
+
+static void lg_panel_shutdown(struct mipi_dsi_device *dsi)
+{
+	struct lg_panel *lg = mipi_dsi_get_drvdata(dsi);
+
+	lg_panel_disable(&lg->base);
+}
+
+static struct mipi_dsi_driver lg_panel_driver = {
+	.driver = {
+		.name = "novatek-1080p-video-mode-dsi-panel",
+		.of_match_table = lg_of_match,
+	},
+	.probe = lg_panel_probe,
+	.remove = lg_panel_remove,
+	.shutdown = lg_panel_shutdown,
+};
+module_mipi_dsi_driver(lg_panel_driver);
+
+MODULE_AUTHOR("steamport <gameexpertnetwork@...il.com>");
+MODULE_DESCRIPTION("Novatek panel driver (linux-mainline, for amazon-thor)");
+MODULE_LICENSE("GPL v2");
\ No newline at end of file
-- 
2.7.4

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