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From: Richard Acayan <mailingradian@gmail.com>
To: Bjorn Andersson <andersson@kernel.org>,
 Konrad Dybcio <konradybcio@kernel.org>, Rob Herring <robh@kernel.org>,
 Krzysztof Kozlowski <krzk+dt@kernel.org>,
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 devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org
Cc: yifei@zhan.science,
	Richard Acayan <mailingradian@gmail.com>
Subject: [PATCH v2 3/6] drm/panel: Add Novatek/Tianma NT37700F panel
Date: Mon, 16 Feb 2026 19:08:51 -0500
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Some Pixel 3a XL devices have a Tianma panel. Add support for it, with
the aid of linux-mdss-dsi-panel-driver-generator.

Link: https://github.com/msm8916-mainline/linux-mdss-dsi-panel-driver-generator
Signed-off-by: Richard Acayan <mailingradian@gmail.com>
Tested-by: Yifei Zhan <yifei@zhan.science>
---
 drivers/gpu/drm/panel/Kconfig                 |   9 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 .../gpu/drm/panel/panel-novatek-nt37700f.c    | 282 ++++++++++++++++++
 3 files changed, 292 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-novatek-nt37700f.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 76f6af819037..138d617e8195 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -553,6 +553,15 @@ config DRM_PANEL_NOVATEK_NT36672E
 	  LCD panel module. The panel has a resolution of 1080x2408 and uses 24 bit
 	  RGB per pixel.
 
+config DRM_PANEL_NOVATEK_NT37700F
+	tristate "Novatek NT37700F DSI 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 Novatek NT37700F DSI
+	  panel module. The panel has a resolution of 1080x2160.
+
 config DRM_PANEL_NOVATEK_NT37801
 	tristate "Novatek NT37801/NT37810 AMOLED DSI panel"
 	depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index b9562a6fdcb3..9218a7d7ff34 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -54,6 +54,7 @@ obj-$(CONFIG_DRM_PANEL_NOVATEK_NT35950) += panel-novatek-nt35950.o
 obj-$(CONFIG_DRM_PANEL_NOVATEK_NT36523) += panel-novatek-nt36523.o
 obj-$(CONFIG_DRM_PANEL_NOVATEK_NT36672A) += panel-novatek-nt36672a.o
 obj-$(CONFIG_DRM_PANEL_NOVATEK_NT36672E) += panel-novatek-nt36672e.o
+obj-$(CONFIG_DRM_PANEL_NOVATEK_NT37700F) += panel-novatek-nt37700f.o
 obj-$(CONFIG_DRM_PANEL_NOVATEK_NT37801) += panel-novatek-nt37801.o
 obj-$(CONFIG_DRM_PANEL_NOVATEK_NT39016) += panel-novatek-nt39016.o
 obj-$(CONFIG_DRM_PANEL_MANTIX_MLAF057WE51) += panel-mantix-mlaf057we51.o
diff --git a/drivers/gpu/drm/panel/panel-novatek-nt37700f.c b/drivers/gpu/drm/panel/panel-novatek-nt37700f.c
new file mode 100644
index 000000000000..e7e6343b2963
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-novatek-nt37700f.c
@@ -0,0 +1,282 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2024, The Linux Foundation. All rights reserved.
+ * Generated with linux-mdss-dsi-panel-driver-generator from vendor device tree:
+ *   Copyright (c) 2013, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+
+#include <video/mipi_display.h>
+
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_probe_helper.h>
+
+struct nt37700f_tianma {
+	struct drm_panel panel;
+	struct mipi_dsi_device *dsi;
+	struct gpio_desc *reset_gpio;
+};
+
+static inline
+struct nt37700f_tianma *to_nt37700f_tianma(struct drm_panel *panel)
+{
+	return container_of(panel, struct nt37700f_tianma, panel);
+}
+
+static void nt37700f_tianma_reset(struct nt37700f_tianma *ctx)
+{
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	usleep_range(1000, 2000);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(10000, 11000);
+}
+
+static int nt37700f_tianma_on(struct nt37700f_tianma *ctx)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
+
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf0, 0x55, 0xaa, 0x52, 0x08, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xc0, 0x56);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xca, 0x52);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x06);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xb5, 0x2b, 0x1a);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf0, 0x55, 0xaa, 0x52, 0x08, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xcd, 0x04, 0x82);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf0, 0x55, 0xaa, 0x52, 0x08, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xcc, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xff, 0xaa, 0x55, 0xa5, 0x80);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x55);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf6, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x56);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf6, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xff, 0xaa, 0x55, 0xa5, 0x81);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x07);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf3, 0x07);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x05);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf3, 0x25);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x90, 0x01);
+
+	mipi_dsi_dcs_set_column_address_multi(&dsi_ctx, 0x0000, 1080 - 1);
+	mipi_dsi_dcs_set_page_address_multi(&dsi_ctx, 0x0000, 2160 - 1);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_WRITE_CONTROL_DISPLAY, 0x20);
+	mipi_dsi_dcs_set_tear_on_multi(&dsi_ctx, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
+
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf0, 0x55, 0xaa, 0x52, 0x08, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xc0, 0x56);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf0, 0x55, 0xaa, 0x52, 0x08, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xcd, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf0, 0x55, 0xaa, 0x52, 0x08, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xd0, 0x11, 0x64);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x09);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xb1, 0x20);
+
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 120);
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+
+	return dsi_ctx.accum_err;
+}
+
+static int nt37700f_tianma_disable(struct drm_panel *panel)
+{
+	struct nt37700f_tianma *ctx = to_nt37700f_tianma(panel);
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
+
+	mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 50);
+	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 100);
+
+	return dsi_ctx.accum_err;
+}
+
+static int nt37700f_tianma_prepare(struct drm_panel *panel)
+{
+	struct nt37700f_tianma *ctx = to_nt37700f_tianma(panel);
+	struct device *dev = &ctx->dsi->dev;
+	int ret;
+
+	nt37700f_tianma_reset(ctx);
+
+	ret = nt37700f_tianma_on(ctx);
+	if (ret < 0) {
+		dev_err(dev, "Failed to initialize panel: %d\n", ret);
+		gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int nt37700f_tianma_unprepare(struct drm_panel *panel)
+{
+	struct nt37700f_tianma *ctx = to_nt37700f_tianma(panel);
+
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+
+	return 0;
+}
+
+static const struct drm_display_mode nt37700f_tianma_mode = {
+	.clock = (1080 + 32 + 32 + 98) * (2160 + 32 + 4 + 98) * 60 / 1000,
+	.hdisplay = 1080,
+	.hsync_start = 1080 + 32,
+	.hsync_end = 1080 + 32 + 32,
+	.htotal = 1080 + 32 + 32 + 98,
+	.vdisplay = 2160,
+	.vsync_start = 2160 + 32,
+	.vsync_end = 2160 + 32 + 4,
+	.vtotal = 2160 + 32 + 4 + 98,
+	.width_mm = 69,
+	.height_mm = 137,
+	.type = DRM_MODE_TYPE_DRIVER,
+};
+
+static int nt37700f_tianma_get_modes(struct drm_panel *panel,
+				     struct drm_connector *connector)
+{
+	return drm_connector_helper_get_modes_fixed(connector, &nt37700f_tianma_mode);
+}
+
+static const struct drm_panel_funcs nt37700f_tianma_panel_funcs = {
+	.prepare = nt37700f_tianma_prepare,
+	.unprepare = nt37700f_tianma_unprepare,
+	.disable = nt37700f_tianma_disable,
+	.get_modes = nt37700f_tianma_get_modes,
+};
+
+static int nt37700f_tianma_bl_update_status(struct backlight_device *bl)
+{
+	struct mipi_dsi_device *dsi = bl_get_data(bl);
+	u16 brightness = backlight_get_brightness(bl);
+	int ret;
+
+	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+	ret = mipi_dsi_dcs_set_display_brightness_large(dsi, brightness);
+	if (ret < 0)
+		return ret;
+
+	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	return 0;
+}
+
+static int nt37700f_tianma_bl_get_brightness(struct backlight_device *bl)
+{
+	struct mipi_dsi_device *dsi = bl_get_data(bl);
+	u16 brightness;
+	int ret;
+
+	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+	ret = mipi_dsi_dcs_get_display_brightness_large(dsi, &brightness);
+	if (ret < 0)
+		return ret;
+
+	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	return brightness;
+}
+
+static const struct backlight_ops nt37700f_tianma_bl_ops = {
+	.update_status = nt37700f_tianma_bl_update_status,
+	.get_brightness = nt37700f_tianma_bl_get_brightness,
+};
+
+static struct backlight_device *
+nt37700f_tianma_create_backlight(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	const struct backlight_properties props = {
+		.type = BACKLIGHT_RAW,
+		.brightness = 2047,
+		.max_brightness = 2047,
+	};
+
+	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
+					      &nt37700f_tianma_bl_ops, &props);
+}
+
+static int nt37700f_tianma_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	struct nt37700f_tianma *ctx;
+	int ret;
+
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(ctx->reset_gpio))
+		return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
+				     "Failed to get reset-gpios\n");
+
+	ctx->dsi = dsi;
+	mipi_dsi_set_drvdata(dsi, ctx);
+
+	dsi->lanes = 4;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO_BURST |
+			  MIPI_DSI_CLOCK_NON_CONTINUOUS | MIPI_DSI_MODE_LPM;
+
+	drm_panel_init(&ctx->panel, dev, &nt37700f_tianma_panel_funcs,
+		       DRM_MODE_CONNECTOR_DSI);
+	ctx->panel.prepare_prev_first = true;
+
+	ctx->panel.backlight = nt37700f_tianma_create_backlight(dsi);
+	if (IS_ERR(ctx->panel.backlight))
+		return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight),
+				     "Failed to create backlight\n");
+
+	drm_panel_add(&ctx->panel);
+
+	ret = mipi_dsi_attach(dsi);
+	if (ret < 0) {
+		drm_panel_remove(&ctx->panel);
+		return dev_err_probe(dev, ret, "Failed to attach to DSI host\n");
+	}
+
+	return 0;
+}
+
+static void nt37700f_tianma_remove(struct mipi_dsi_device *dsi)
+{
+	struct nt37700f_tianma *ctx = mipi_dsi_get_drvdata(dsi);
+	int ret;
+
+	ret = mipi_dsi_detach(dsi);
+	if (ret < 0)
+		dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
+
+	drm_panel_remove(&ctx->panel);
+}
+
+static const struct of_device_id nt37700f_tianma_of_match[] = {
+	{ .compatible = "novatek,nt37700f" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, nt37700f_tianma_of_match);
+
+static struct mipi_dsi_driver nt37700f_tianma_driver = {
+	.probe = nt37700f_tianma_probe,
+	.remove = nt37700f_tianma_remove,
+	.driver = {
+		.name = "panel-novatek-nt37700f",
+		.of_match_table = nt37700f_tianma_of_match,
+	},
+};
+module_mipi_dsi_driver(nt37700f_tianma_driver);
+
+MODULE_DESCRIPTION("DRM driver for nt37700f cmd mode dsi tianma panel");
+MODULE_LICENSE("GPL");
-- 
2.53.0