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From: Yedaya Katsman <yedaya.ka@gmail.com>
Date: Thu, 12 Mar 2026 13:55:09 +0200
Subject: [PATCH v3 2/3] drm: panel: Add Samsung S6E8FCO DSI controller for
 M1906F9 panel
Precedence: bulk
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To: Neil Armstrong <neil.armstrong@linaro.org>,
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Cc: ~postmarketos/upstreaming@lists.sr.ht, phone-devel@vger.kernel.org,
 dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
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 pk=CgNmxD3tYSws5dZfpmJfc6re/bV/f47veVijddHLytk=

Add driver for Samsung S6E8FCO DSI controller for M1906F9 video mode panel,
found in Xiaomi Mi A3 mobile phone.

Co-developed-by: Kamil Go=C5=82da <kamil.golda@protonmail.com>
Signed-off-by: Kamil Go=C5=82da <kamil.golda@protonmail.com>
Signed-off-by: Yedaya Katsman <yedaya.ka@gmail.com>
---
 MAINTAINERS                                        |   1 +
 drivers/gpu/drm/panel/Kconfig                      |  13 +
 drivers/gpu/drm/panel/Makefile                     |   1 +
 .../gpu/drm/panel/panel-samsung-s6e8fco-m1906f9.c  | 302 +++++++++++++++++=
++++
 4 files changed, 317 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index d7aee8dab903cd42c245fea3cf8971dcd99b2196..d00775a09445a8a1bd626ecfd27=
903471d08d33a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8187,6 +8187,7 @@ DRM DRIVER FOR SAMSUNG S6E8FCO PANELS
 M:	Yedaya Katsman <yedaya.ka@gmail.com>
 S:	Maintained
 F:	Documentation/devicetree/bindings/display/panel/samsung,s6e8fco-m1906f9=
.yaml
+F:	drivers/gpu/drm/panel/panel-samsung-s6e8fco-m1906f9.c
=20
 DRM DRIVER FOR SAMSUNG SOFEF00 DDIC
 M:	David Heidelberg <david@ixit.cz>
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 7a83804fedca1b688ce6fbe4295ec9009007e693..ee9cc6939f2ac1dc4542563fd73=
f68ac5f9ee371 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -893,6 +893,19 @@ config DRM_PANEL_SAMSUNG_S6E8AA5X01_AMS561RA01
 	  ~5.6 inch AMOLED display, and the controller is driven by the MIPI
 	  DSI protocol with 4 lanes.
=20
+config DRM_PANEL_SAMSUNG_S6E8FCO_M1906F9
+	tristate "Samsung M1906F9 panel with S6E8FCO DSI controller"
+	depends on OF
+	depends on BACKLIGHT_CLASS_DEVICE
+	select DRM_MIPI_DSI
+	select VIDEOMODE_HELPERS
+	help
+	  Say Y or M here if you want to enable support for the Samsung video
+	  mode panel M1906F9 (M1906F9SH or M1906F9SI), which uses the Samsung
+	  S6E8FCO DSI controller. The panel has a 6.09 inch AMOLED display,
+	  with a resolution of 720x1560.
+	  Found in the Xiaomi Mi A3 smartphone (xiaomi-laurel).
+
 config DRM_PANEL_SAMSUNG_SOFEF00
 	tristate "Samsung SOFEF00 DSI panel controller"
 	depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index b9562a6fdcb38bfd0dfee9e8c11e16149ada4386..19e1e898dfd4af2d34eafe7a6de=
d5ad74fc7ee04 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -91,6 +91,7 @@ obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E88A0_AMS427AP24) +=3D p=
anel-samsung-s6e88a0-ams4
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E88A0_AMS452EF01) +=3D panel-samsung-s6e8=
8a0-ams452ef01.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) +=3D panel-samsung-s6e8aa0.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA5X01_AMS561RA01) +=3D panel-samsung-s=
6e8aa5x01-ams561ra01.o
+obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8FCO_M1906F9) +=3D panel-samsung-s6e8fco=
-m1906f9.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_SOFEF00) +=3D panel-samsung-sofef00.o
 obj-$(CONFIG_DRM_PANEL_SEIKO_43WVF1G) +=3D panel-seiko-43wvf1g.o
 obj-$(CONFIG_DRM_PANEL_SHARP_LQ079L1SX01) +=3D panel-sharp-lq079l1sx01.o
diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e8fco-m1906f9.c b/driver=
s/gpu/drm/panel/panel-samsung-s6e8fco-m1906f9.c
new file mode 100644
index 0000000000000000000000000000000000000000..ccf18da59271dc4926a536f795a=
38d8eae349e00
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-samsung-s6e8fco-m1906f9.c
@@ -0,0 +1,302 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright (c) Kamil Go=C5=82da <kamil.golda@protonmail.com>
+// Copyright (c) Yedaya Katsman <yedaya.ka@gmail.com>
+// Generated with linux-mdss-dsi-panel-driver-generator from vendor device=
 tree:
+//   Copyright (c) The Linux Foundation. All rights reserved.
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.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 s6e8fco_m1906f9_ctx {
+	struct drm_panel panel;
+	struct mipi_dsi_device *dsi;
+	struct regulator_bulk_data *supplies;
+	struct gpio_desc *reset_gpio;
+};
+
+static const struct regulator_bulk_data s6e8fco_m1906f9_supplies[] =3D {
+	{ .supply =3D "vddi" },
+	{ .supply =3D "vci" },
+};
+
+static inline
+struct s6e8fco_m1906f9_ctx *to_s6e8fco_m1906f9_ctx(struct drm_panel *panel)
+{
+	return container_of_const(panel, struct s6e8fco_m1906f9_ctx, panel);
+}
+
+static void s6e8fco_m1906f9_reset(struct s6e8fco_m1906f9_ctx *ctx)
+{
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(12000, 13000);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	usleep_range(2000, 3000);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(10000, 11000);
+}
+
+#define s6e8fco_m1906f9_test_key_on_lvl2(ctx) \
+	mipi_dsi_dcs_write_seq_multi(ctx, 0xf0, 0x5a, 0x5a)
+#define s6e8fco_m1906f9_test_key_off_lvl2(ctx) \
+	mipi_dsi_dcs_write_seq_multi(ctx, 0xf0, 0xa5, 0xa5)
+#define s6e8fco_m1906f9_test_key_on_lvl3(ctx) \
+	mipi_dsi_dcs_write_seq_multi(ctx, 0xfc, 0x5a, 0x5a)
+#define s6e8fco_m1906f9_test_key_off_lvl3(ctx) \
+	mipi_dsi_dcs_write_seq_multi(ctx, 0xfc, 0xa5, 0xa5)
+
+static int s6e8fco_m1906f9_on(struct s6e8fco_m1906f9_ctx *ctx)
+{
+	struct mipi_dsi_multi_context dsi_ctx =3D { .dsi =3D ctx->dsi };
+
+	s6e8fco_m1906f9_test_key_on_lvl3(&dsi_ctx);
+
+	mipi_dsi_dcs_set_display_brightness_multi(&dsi_ctx, 0x0000);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_WRITE_CONTROL_DISPLAY,
+				     0x20);
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 50);
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xb0, 0x04, 0xed);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xed,
+				     0xe4, 0x08, 0x96, 0xa4, 0x2a, 0x72, 0xe2,
+				     0xca, 0x00);
+	s6e8fco_m1906f9_test_key_off_lvl3(&dsi_ctx);
+	s6e8fco_m1906f9_test_key_on_lvl2(&dsi_ctx);
+	s6e8fco_m1906f9_test_key_on_lvl3(&dsi_ctx);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xe1, 0x93);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xb0, 0x05, 0xf4);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf4, 0x03);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xed, 0x01, 0x81, 0x04);
+	s6e8fco_m1906f9_test_key_off_lvl2(&dsi_ctx);
+	s6e8fco_m1906f9_test_key_off_lvl3(&dsi_ctx);
+
+	return dsi_ctx.accum_err;
+}
+
+static int s6e8fco_m1906f9_off(struct s6e8fco_m1906f9_ctx *ctx)
+{
+	struct mipi_dsi_multi_context dsi_ctx =3D { .dsi =3D ctx->dsi };
+
+	mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 20);
+	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 120);
+
+	return dsi_ctx.accum_err;
+}
+
+static int s6e8fco_m1906f9_prepare(struct drm_panel *panel)
+{
+	struct s6e8fco_m1906f9_ctx *ctx =3D to_s6e8fco_m1906f9_ctx(panel);
+	struct device *dev =3D &ctx->dsi->dev;
+	int ret;
+
+	ret =3D regulator_bulk_enable(ARRAY_SIZE(s6e8fco_m1906f9_supplies), ctx->=
supplies);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable regulators: %d\n", ret);
+		return ret;
+	}
+
+	s6e8fco_m1906f9_reset(ctx);
+
+	ret =3D s6e8fco_m1906f9_on(ctx);
+	if (ret < 0) {
+		dev_err(dev, "Failed to initialize panel: %d\n", ret);
+		gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+		regulator_bulk_disable(ARRAY_SIZE(s6e8fco_m1906f9_supplies), ctx->suppli=
es);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int s6e8fco_m1906f9_unprepare(struct drm_panel *panel)
+{
+	struct s6e8fco_m1906f9_ctx *ctx =3D to_s6e8fco_m1906f9_ctx(panel);
+	struct device *dev =3D &ctx->dsi->dev;
+	int ret;
+
+	ret =3D s6e8fco_m1906f9_off(ctx);
+	if (ret < 0)
+		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
+
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	regulator_bulk_disable(ARRAY_SIZE(s6e8fco_m1906f9_supplies), ctx->supplie=
s);
+
+	return 0;
+}
+
+static const struct drm_display_mode s6e8fco_m1906f9_samsungp_mode =3D {
+	.clock =3D (720 + 350 + 40 + 294) * (1560 + 17 + 2 + 5) * 60 / 1000,
+	.hdisplay =3D 720,
+	.hsync_start =3D 720 + 350,
+	.hsync_end =3D 720 + 350 + 40,
+	.htotal =3D 720 + 350 + 40 + 294,
+	.vdisplay =3D 1560,
+	.vsync_start =3D 1560 + 17,
+	.vsync_end =3D 1560 + 17 + 2,
+	.vtotal =3D 1560 + 17 + 2 + 5,
+	.width_mm =3D 65,
+	.height_mm =3D 140,
+	.type =3D DRM_MODE_TYPE_DRIVER,
+};
+
+static int s6e8fco_m1906f9_get_modes(struct drm_panel *panel,
+				      struct drm_connector *connector)
+{
+	return drm_connector_helper_get_modes_fixed(connector, &s6e8fco_m1906f9_s=
amsungp_mode);
+}
+
+static const struct drm_panel_funcs s6e8fco_m1906f9_panel_funcs =3D {
+	.prepare =3D s6e8fco_m1906f9_prepare,
+	.unprepare =3D s6e8fco_m1906f9_unprepare,
+	.get_modes =3D s6e8fco_m1906f9_get_modes,
+};
+
+static int s6e8fco_m1906f9_bl_update_status(struct backlight_device *bl)
+{
+	struct mipi_dsi_device *dsi =3D bl_get_data(bl);
+	u16 brightness =3D backlight_get_brightness(bl);
+	int ret;
+
+	dsi->mode_flags &=3D ~MIPI_DSI_MODE_LPM;
+
+	ret =3D mipi_dsi_dcs_set_display_brightness_large(dsi, brightness);
+	if (ret < 0)
+		return ret;
+
+	dsi->mode_flags |=3D MIPI_DSI_MODE_LPM;
+
+	return 0;
+}
+
+static int s6e8fco_m1906f9_bl_get_brightness(struct backlight_device *bl)
+{
+	struct mipi_dsi_device *dsi =3D bl_get_data(bl);
+	u16 brightness;
+	int ret;
+
+	dsi->mode_flags &=3D ~MIPI_DSI_MODE_LPM;
+
+	ret =3D mipi_dsi_dcs_get_display_brightness_large(dsi, &brightness);
+	if (ret < 0)
+		return ret;
+
+	dsi->mode_flags |=3D MIPI_DSI_MODE_LPM;
+
+	return brightness;
+}
+
+static const struct backlight_ops s6e8fco_m1906f9_bl_ops =3D {
+	.update_status =3D s6e8fco_m1906f9_bl_update_status,
+	.get_brightness =3D s6e8fco_m1906f9_bl_get_brightness,
+};
+
+static struct backlight_device *
+s6e8fco_m1906f9_create_backlight(struct mipi_dsi_device *dsi)
+{
+	struct device *dev =3D &dsi->dev;
+	const struct backlight_properties props =3D {
+		.type =3D BACKLIGHT_RAW,
+		.brightness =3D 512,
+		// The downstream dts claims 2047, but seems to ignore the MSB.
+		.max_brightness =3D 1023,
+	};
+
+	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
+					      &s6e8fco_m1906f9_bl_ops, &props);
+}
+
+static int s6e8fco_m1906f9_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev =3D &dsi->dev;
+	struct s6e8fco_m1906f9_ctx *ctx;
+	int ret;
+
+	ctx =3D devm_drm_panel_alloc(dev, struct s6e8fco_m1906f9_ctx, panel,
+				   &s6e8fco_m1906f9_panel_funcs,
+				   DRM_MODE_CONNECTOR_DSI);
+	if (IS_ERR(ctx))
+		return PTR_ERR(ctx);
+
+	ret =3D devm_regulator_bulk_get_const(dev,
+					    ARRAY_SIZE(s6e8fco_m1906f9_supplies),
+					    s6e8fco_m1906f9_supplies,
+					    &ctx->supplies);
+	if (ret < 0)
+		return ret;
+
+	ctx->reset_gpio =3D 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 =3D dsi;
+	mipi_dsi_set_drvdata(dsi, ctx);
+
+	dsi->lanes =3D 4;
+	dsi->format =3D MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags =3D MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
+			  MIPI_DSI_CLOCK_NON_CONTINUOUS;
+
+	ctx->panel.prepare_prev_first =3D true;
+
+	ctx->panel.backlight =3D s6e8fco_m1906f9_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 =3D 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 s6e8fco_m1906f9_remove(struct mipi_dsi_device *dsi)
+{
+	struct s6e8fco_m1906f9_ctx *ctx =3D mipi_dsi_get_drvdata(dsi);
+	int ret;
+
+	ret =3D 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 samsung_s6e8fco_m1906f9_of_match[] =3D {
+	{ .compatible =3D "samsung,s6e8fco-m1906f9" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, samsung_s6e8fco_m1906f9_of_match);
+
+static struct mipi_dsi_driver s6e8fco_m1906f9_driver =3D {
+	.probe =3D s6e8fco_m1906f9_probe,
+	.remove =3D s6e8fco_m1906f9_remove,
+	.driver =3D {
+		.name =3D "panel-samsung-s6e8fco-m1906f9",
+		.of_match_table =3D samsung_s6e8fco_m1906f9_of_match,
+	},
+};
+module_mipi_dsi_driver(s6e8fco_m1906f9_driver);
+
+MODULE_AUTHOR("Kamil Go=C5=82da <kamil.golda@protonmail.com>");
+MODULE_DESCRIPTION("DRM driver for Samsubng s6e8fco DSI controller for m19=
06f9 amoled video mode panel");
+MODULE_LICENSE("GPL");

--=20
2.53.0