[PATCH v5 2/3] drm/panel: Add Samsung S6D7AA0 panel controller driver

Artur Weber
2023-05-19T17:04:21Z

Initial driver for S6D7AA0-controlled panels. Currently, the following
panels are supported:

- S6D7AA0-LSL080AL02 (Samsung Galaxy Tab 3 8.0)
- S6D7AA0-LSL080AL03 (Samsung Galaxy Tab A 8.0 2015)
- S6D7AA0-LTL101AT01 (Samsung Galaxy Tab A 9.7 2015)

It should be possible to extend this driver to work with other panels
using this IC.

Tested-by: Nikita Travkin <nikita@trvn.ru> #ltl101at01
Signed-off-by: Artur Weber <aweber.kernel@gmail.com>
---
Changed in v2:
- Removed unused panel_name property from desc struct
Changed in v4:
- Added LSL080AL03 and LTL101AT01 panels
- Added DSI-controlled backlight support for panels that support it
- Renamed command defines: CMD_* -> MCS_*
- Dropped s6d7aa0_bl_ctl_on (not universal across panels)
- Dropped MIPI_DSI_MODE_LPM flag
- Added vmipi-supply, renamed enable-supply to power-supply
Changed in v5:
- Changed compatible to avoid concatenating multiple model numbers
---
drivers/gpu/drm/panel/Kconfig | 7 +
drivers/gpu/drm/panel/Makefile | 1 +
drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c | 585 ++++++++++++++++++
3 files changed, 593 insertions(+)
create mode 100644 drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 2b9d6db7860b..203c0ef0bbfd 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -553,6 +553,13 @@ config DRM_PANEL_SAMSUNG_S6D27A1
This panel can be found in Samsung Galaxy Ace 2
GT-I8160 mobile phone.

+config DRM_PANEL_SAMSUNG_S6D7AA0
+ tristate "Samsung S6D7AA0 MIPI-DSI video mode panel controller"
+ depends on OF
+ depends on BACKLIGHT_CLASS_DEVICE
+ select DRM_MIPI_DSI
+ select VIDEOMODE_HELPERS
+
config DRM_PANEL_SAMSUNG_S6E3HA2
tristate "Samsung S6E3HA2 DSI video mode panel"
depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index ff169781e82d..30cf553c8d1d 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -54,6 +54,7 @@ obj-$(CONFIG_DRM_PANEL_SAMSUNG_DB7430) += panel-samsung-db7430.o
obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o
obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D16D0) += panel-samsung-s6d16d0.o
obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D27A1) += panel-samsung-s6d27a1.o
+obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D7AA0) += panel-samsung-s6d7aa0.o
obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E3HA2) += panel-samsung-s6e3ha2.o
obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63J0X03) += panel-samsung-s6e63j0x03.o
obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63M0) += panel-samsung-s6e63m0.o
diff --git a/drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c b/drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c
new file mode 100644
index 000000000000..f532aa018428
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c
@@ -0,0 +1,585 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Samsung S6D7AA0 MIPI-DSI TFT LCD controller drm_panel driver.
+ *
+ * Copyright (C) 2022 Artur Weber <aweber.kernel@gmail.com>
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+
+#include <video/mipi_display.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+
+/* Manufacturer command set */
+#define MCS_BL_CTL 0xc3
+#define MCS_OTP_RELOAD 0xd0
+#define MCS_PASSWD1 0xf0
+#define MCS_PASSWD2 0xf1
+#define MCS_PASSWD3 0xfc
+
+struct s6d7aa0 {
+ struct drm_panel panel;
+ struct mipi_dsi_device *dsi;
+ struct gpio_desc *reset_gpio;
+ struct regulator_bulk_data supplies[2];
+ const struct s6d7aa0_panel_desc *desc;
+};
+
+struct s6d7aa0_panel_desc {
+ unsigned int panel_type;
+ int (*init_func)(struct s6d7aa0 *ctx);
+ int (*off_func)(struct s6d7aa0 *ctx);
+ const struct drm_display_mode drm_mode;
+ unsigned long mode_flags;
+ u32 bus_flags;
+ bool has_backlight;
+ bool use_passwd3;
+};
+
+enum s6d7aa0_panels {
+ S6D7AA0_PANEL_LSL080AL02,
+ S6D7AA0_PANEL_LSL080AL03,
+ S6D7AA0_PANEL_LTL101AT01,
+};
+
+static inline struct s6d7aa0 *panel_to_s6d7aa0(struct drm_panel *panel)
+{
+ return container_of(panel, struct s6d7aa0, panel);
+}
+
+static void s6d7aa0_reset(struct s6d7aa0 *ctx)
+{
+ gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+ msleep(50);
+ gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+ msleep(50);
+}
+
+static int s6d7aa0_lock(struct s6d7aa0 *ctx, bool lock)
+{
+ struct mipi_dsi_device *dsi = ctx->dsi;
+ int ret = 0;
+
+ if (lock) {
+ mipi_dsi_dcs_write_seq(dsi, MCS_PASSWD1, 0xa5, 0xa5);
+ mipi_dsi_dcs_write_seq(dsi, MCS_PASSWD2, 0xa5, 0xa5);
+ if (ctx->desc->use_passwd3)
+ mipi_dsi_dcs_write_seq(dsi, MCS_PASSWD3, 0x5a, 0x5a);
+ } else {
+ mipi_dsi_dcs_write_seq(dsi, MCS_PASSWD1, 0x5a, 0x5a);
+ mipi_dsi_dcs_write_seq(dsi, MCS_PASSWD2, 0x5a, 0x5a);
+ if (ctx->desc->use_passwd3)
+ mipi_dsi_dcs_write_seq(dsi, MCS_PASSWD3, 0xa5, 0xa5);
+ }
+
+ return ret;
+}
+
+static int s6d7aa0_on(struct s6d7aa0 *ctx)
+{
+ struct mipi_dsi_device *dsi = ctx->dsi;
+ struct device *dev = &dsi->dev;
+ int ret;
+
+ ret = ctx->desc->init_func(ctx);
+ if (ret < 0) {
+ dev_err(dev, "Failed to initialize panel: %d\n", ret);
+ gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+ return ret;
+ }
+
+ ret = mipi_dsi_dcs_set_display_on(dsi);
+ if (ret < 0) {
+ dev_err(dev, "Failed to set display on: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int s6d7aa0_off(struct s6d7aa0 *ctx)
+{
+ struct mipi_dsi_device *dsi = ctx->dsi;
+ struct device *dev = &dsi->dev;
+ int ret;
+
+ ret = ctx->desc->off_func(ctx);
+ if (ret < 0) {
+ dev_err(dev, "Panel-specific off function failed: %d\n", ret);
+ return ret;
+ }
+
+ ret = mipi_dsi_dcs_set_display_off(dsi);
+ if (ret < 0) {
+ dev_err(dev, "Failed to set display off: %d\n", ret);
+ return ret;
+ }
+ msleep(64);
+
+ ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
+ if (ret < 0) {
+ dev_err(dev, "Failed to enter sleep mode: %d\n", ret);
+ return ret;
+ }
+ msleep(120);
+
+ return 0;
+}
+
+static int s6d7aa0_prepare(struct drm_panel *panel)
+{
+ struct s6d7aa0 *ctx = panel_to_s6d7aa0(panel);
+ struct device *dev = &ctx->dsi->dev;
+ int ret;
+
+ ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+ if (ret < 0) {
+ dev_err(dev, "Failed to enable regulators: %d\n", ret);
+ return ret;
+ }
+
+ s6d7aa0_reset(ctx);
+
+ ret = s6d7aa0_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 s6d7aa0_disable(struct drm_panel *panel)
+{
+ struct s6d7aa0 *ctx = panel_to_s6d7aa0(panel);
+ struct device *dev = &ctx->dsi->dev;
+ int ret;
+
+ ret = s6d7aa0_off(ctx);
+ if (ret < 0)
+ dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
+
+ return 0;
+}
+
+static int s6d7aa0_unprepare(struct drm_panel *panel)
+{
+ struct s6d7aa0 *ctx = panel_to_s6d7aa0(panel);
+
+ gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+ regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+
+ return 0;
+}
+
+/* Backlight control code */
+
+static int s6d7aa0_bl_update_status(struct backlight_device *bl)
+{
+ struct mipi_dsi_device *dsi = bl_get_data(bl);
+ u16 brightness = backlight_get_brightness(bl);
+ int ret;
+
+ ret = mipi_dsi_dcs_set_display_brightness(dsi, brightness);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int s6d7aa0_bl_get_brightness(struct backlight_device *bl)
+{
+ struct mipi_dsi_device *dsi = bl_get_data(bl);
+ u16 brightness;
+ int ret;
+
+ ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
+ if (ret < 0)
+ return ret;
+
+ return brightness & 0xff;
+}
+
+static const struct backlight_ops s6d7aa0_bl_ops = {
+ .update_status = s6d7aa0_bl_update_status,
+ .get_brightness = s6d7aa0_bl_get_brightness,
+};
+
+static struct backlight_device *
+s6d7aa0_create_backlight(struct mipi_dsi_device *dsi)
+{
+ struct device *dev = &dsi->dev;
+ const struct backlight_properties props = {
+ .type = BACKLIGHT_RAW,
+ .brightness = 255,
+ .max_brightness = 255,
+ };
+
+ return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
+ &s6d7aa0_bl_ops, &props);
+}
+
+/* Initialization code and structures for LSL080AL02 panel */
+
+static int s6d7aa0_lsl080al02_init(struct s6d7aa0 *ctx)
+{
+ struct mipi_dsi_device *dsi = ctx->dsi;
+ struct device *dev = &dsi->dev;
+ int ret;
+
+ usleep_range(20000, 25000);
+
+ ret = s6d7aa0_lock(ctx, false);
+ if (ret < 0) {
+ dev_err(dev, "Failed to unlock registers: %d\n", ret);
+ return ret;
+ }
+
+ mipi_dsi_dcs_write_seq(dsi, MCS_OTP_RELOAD, 0x00, 0x10);
+ usleep_range(1000, 1500);
+
+ /* SEQ_B6_PARAM_8_R01 */
+ mipi_dsi_dcs_write_seq(dsi, 0xb6, 0x10);
+
+ /* BL_CTL_ON */
+ mipi_dsi_dcs_write_seq(dsi, MCS_BL_CTL, 0x40, 0x00, 0x28);
+
+ usleep_range(5000, 6000);
+
+ mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_ADDRESS_MODE, 0x04);
+
+ ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
+ if (ret < 0) {
+ dev_err(dev, "Failed to exit sleep mode: %d\n", ret);
+ return ret;
+ }
+
+ msleep(120);
+ mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_ADDRESS_MODE, 0x00);
+
+ ret = s6d7aa0_lock(ctx, true);
+ if (ret < 0) {
+ dev_err(dev, "Failed to lock registers: %d\n", ret);
+ return ret;
+ }
+
+ ret = mipi_dsi_dcs_set_display_on(dsi);
+ if (ret < 0) {
+ dev_err(dev, "Failed to set display on: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int s6d7aa0_lsl080al02_off(struct s6d7aa0 *ctx)
+{
+ struct mipi_dsi_device *dsi = ctx->dsi;
+
+ /* BL_CTL_OFF */
+ mipi_dsi_dcs_write_seq(dsi, MCS_BL_CTL, 0x40, 0x00, 0x20);
+
+ return 0;
+}
+
+static const struct drm_display_mode s6d7aa0_lsl080al02_mode = {
+ .clock = (800 + 16 + 4 + 140) * (1280 + 8 + 4 + 4) * 60 / 1000,
+ .hdisplay = 800,
+ .hsync_start = 800 + 16,
+ .hsync_end = 800 + 16 + 4,
+ .htotal = 800 + 16 + 4 + 140,
+ .vdisplay = 1280,
+ .vsync_start = 1280 + 8,
+ .vsync_end = 1280 + 8 + 4,
+ .vtotal = 1280 + 8 + 4 + 4,
+ .width_mm = 108,
+ .height_mm = 173,
+};
+
+static const struct s6d7aa0_panel_desc s6d7aa0_lsl080al02_desc = {
+ .panel_type = S6D7AA0_PANEL_LSL080AL02,
+ .init_func = s6d7aa0_lsl080al02_init,
+ .off_func = s6d7aa0_lsl080al02_off,
+ .drm_mode = s6d7aa0_lsl080al02_mode,
+ .mode_flags = MIPI_DSI_MODE_VSYNC_FLUSH | MIPI_DSI_MODE_VIDEO_NO_HFP,
+ .bus_flags = DRM_BUS_FLAG_DE_HIGH,
+
+ .has_backlight = false,
+ .use_passwd3 = false,
+};
+
+/* Initialization code and structures for LSL080AL03 panel */
+
+static int s6d7aa0_lsl080al03_init(struct s6d7aa0 *ctx)
+{
+ struct mipi_dsi_device *dsi = ctx->dsi;
+ struct device *dev = &dsi->dev;
+ int ret;
+
+ usleep_range(20000, 25000);
+
+ ret = s6d7aa0_lock(ctx, false);
+ if (ret < 0) {
+ dev_err(dev, "Failed to unlock registers: %d\n", ret);
+ return ret;
+ }
+
+ if (ctx->desc->panel_type == S6D7AA0_PANEL_LSL080AL03) {
+ mipi_dsi_dcs_write_seq(dsi, MCS_BL_CTL, 0xc7, 0x00, 0x29);
+ mipi_dsi_dcs_write_seq(dsi, 0xbc, 0x01, 0x4e, 0xa0);
+ mipi_dsi_dcs_write_seq(dsi, 0xfd, 0x16, 0x10, 0x11, 0x23,
+ 0x09);
+ mipi_dsi_dcs_write_seq(dsi, 0xfe, 0x00, 0x02, 0x03, 0x21,
+ 0x80, 0x78);
+ } else if (ctx->desc->panel_type == S6D7AA0_PANEL_LTL101AT01) {
+ mipi_dsi_dcs_write_seq(dsi, MCS_BL_CTL, 0x40, 0x00, 0x08);
+ mipi_dsi_dcs_write_seq(dsi, 0xbc, 0x01, 0x4e, 0x0b);
+ mipi_dsi_dcs_write_seq(dsi, 0xfd, 0x16, 0x10, 0x11, 0x23,
+ 0x09);
+ mipi_dsi_dcs_write_seq(dsi, 0xfe, 0x00, 0x02, 0x03, 0x21,
+ 0x80, 0x68);
+ }
+
+ mipi_dsi_dcs_write_seq(dsi, 0xb3, 0x51);
+ mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY, 0x24);
+ mipi_dsi_dcs_write_seq(dsi, 0xf2, 0x02, 0x08, 0x08);
+
+ usleep_range(10000, 11000);
+
+ mipi_dsi_dcs_write_seq(dsi, 0xc0, 0x80, 0x80, 0x30);
+ mipi_dsi_dcs_write_seq(dsi, 0xcd,
+ 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
+ 0x2e, 0x2e, 0x2e, 0x2e, 0x2e);
+ mipi_dsi_dcs_write_seq(dsi, 0xce,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00);
+ mipi_dsi_dcs_write_seq(dsi, 0xc1, 0x03);
+
+ ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
+ if (ret < 0) {
+ dev_err(dev, "Failed to exit sleep mode: %d\n", ret);
+ return ret;
+ }
+
+ ret = s6d7aa0_lock(ctx, true);
+ if (ret < 0) {
+ dev_err(dev, "Failed to lock registers: %d\n", ret);
+ return ret;
+ }
+
+ ret = mipi_dsi_dcs_set_display_on(dsi);
+ if (ret < 0) {
+ dev_err(dev, "Failed to set display on: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int s6d7aa0_lsl080al03_off(struct s6d7aa0 *ctx)
+{
+ struct mipi_dsi_device *dsi = ctx->dsi;
+
+ mipi_dsi_dcs_write_seq(dsi, 0x22, 0x00);
+
+ return 0;
+}
+
+static const struct drm_display_mode s6d7aa0_lsl080al03_mode = {
+ .clock = (768 + 18 + 16 + 126) * (1024 + 8 + 2 + 6) * 60 / 1000,
+ .hdisplay = 768,
+ .hsync_start = 768 + 18,
+ .hsync_end = 768 + 18 + 16,
+ .htotal = 768 + 18 + 16 + 126,
+ .vdisplay = 1024,
+ .vsync_start = 1024 + 8,
+ .vsync_end = 1024 + 8 + 2,
+ .vtotal = 1024 + 8 + 2 + 6,
+ .width_mm = 122,
+ .height_mm = 163,
+};
+
+static const struct s6d7aa0_panel_desc s6d7aa0_lsl080al03_desc = {
+ .panel_type = S6D7AA0_PANEL_LSL080AL03,
+ .init_func = s6d7aa0_lsl080al03_init,
+ .off_func = s6d7aa0_lsl080al03_off,
+ .drm_mode = s6d7aa0_lsl080al03_mode,
+ .mode_flags = MIPI_DSI_MODE_NO_EOT_PACKET,
+ .bus_flags = 0,
+
+ .has_backlight = true,
+ .use_passwd3 = true,
+};
+
+/* Initialization structures for LTL101AT01 panel */
+
+static const struct drm_display_mode s6d7aa0_ltl101at01_mode = {
+ .clock = (768 + 96 + 16 + 184) * (1024 + 8 + 2 + 6) * 60 / 1000,
+ .hdisplay = 768,
+ .hsync_start = 768 + 96,
+ .hsync_end = 768 + 96 + 16,
+ .htotal = 768 + 96 + 16 + 184,
+ .vdisplay = 1024,
+ .vsync_start = 1024 + 8,
+ .vsync_end = 1024 + 8 + 2,
+ .vtotal = 1024 + 8 + 2 + 6,
+ .width_mm = 148,
+ .height_mm = 197,
+};
+
+static const struct s6d7aa0_panel_desc s6d7aa0_ltl101at01_desc = {
+ .panel_type = S6D7AA0_PANEL_LTL101AT01,
+ .init_func = s6d7aa0_lsl080al03_init, /* Similar init to LSL080AL03 */
+ .off_func = s6d7aa0_lsl080al03_off,
+ .drm_mode = s6d7aa0_ltl101at01_mode,
+ .mode_flags = MIPI_DSI_MODE_NO_EOT_PACKET,
+ .bus_flags = 0,
+
+ .has_backlight = true,
+ .use_passwd3 = true,
+};
+
+static int s6d7aa0_get_modes(struct drm_panel *panel,
+ struct drm_connector *connector)
+{
+ struct drm_display_mode *mode;
+ struct s6d7aa0 *ctx;
+
+ ctx = container_of(panel, struct s6d7aa0, panel);
+ if (!ctx)
+ return -EINVAL;
+
+ mode = drm_mode_duplicate(connector->dev, &ctx->desc->drm_mode);
+ if (!mode)
+ return -ENOMEM;
+
+ drm_mode_set_name(mode);
+
+ mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+ connector->display_info.width_mm = mode->width_mm;
+ connector->display_info.height_mm = mode->height_mm;
+ connector->display_info.bus_flags = ctx->desc->bus_flags;
+ drm_mode_probed_add(connector, mode);
+
+ return 1;
+}
+
+static const struct drm_panel_funcs s6d7aa0_panel_funcs = {
+ .disable = s6d7aa0_disable,
+ .prepare = s6d7aa0_prepare,
+ .unprepare = s6d7aa0_unprepare,
+ .get_modes = s6d7aa0_get_modes,
+};
+
+static int s6d7aa0_probe(struct mipi_dsi_device *dsi)
+{
+ struct device *dev = &dsi->dev;
+ struct s6d7aa0 *ctx;
+ int ret;
+
+ ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ ctx->desc = of_device_get_match_data(dev);
+ if (!ctx->desc)
+ return -ENODEV;
+
+ ctx->supplies[0].supply = "power";
+ ctx->supplies[1].supply = "vmipi";
+ ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
+ ctx->supplies);
+ if (ret < 0)
+ return dev_err_probe(dev, ret, "Failed to get regulators\n");
+
+ 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 | MIPI_DSI_MODE_VIDEO_BURST
+ | ctx->desc->mode_flags;
+
+ drm_panel_init(&ctx->panel, dev, &s6d7aa0_panel_funcs,
+ DRM_MODE_CONNECTOR_DSI);
+ ctx->panel.prepare_prev_first = true;
+
+ ret = drm_panel_of_backlight(&ctx->panel);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to get backlight\n");
+
+ /* Use DSI-based backlight as fallback if available */
+ if (ctx->desc->has_backlight && !ctx->panel.backlight) {
+ ctx->panel.backlight = s6d7aa0_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) {
+ dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
+ drm_panel_remove(&ctx->panel);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void s6d7aa0_remove(struct mipi_dsi_device *dsi)
+{
+ struct s6d7aa0 *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 s6d7aa0_of_match[] = {
+ {
+ .compatible = "samsung,lsl080al02",
+ .data = &s6d7aa0_lsl080al02_desc
+ },
+ {
+ .compatible = "samsung,lsl080al03",
+ .data = &s6d7aa0_lsl080al03_desc
+ },
+ {
+ .compatible = "samsung,ltl101at01",
+ .data = &s6d7aa0_ltl101at01_desc
+ },
+ { /* sentinel */ }
+};
+
+static struct mipi_dsi_driver s6d7aa0_driver = {
+ .probe = s6d7aa0_probe,
+ .remove = s6d7aa0_remove,
+ .driver = {
+ .name = "panel-samsung-s6d7aa0",
+ .of_match_table = s6d7aa0_of_match,
+ },
+};
+module_mipi_dsi_driver(s6d7aa0_driver);
+
+MODULE_AUTHOR("Artur Weber <aweber.kernel@gmail.com>");
+MODULE_DESCRIPTION("Samsung S6D7AA0 MIPI-DSI LCD controller driver");
+MODULE_LICENSE("GPL");
--
2.40.1