[PATCH 2/3] drm: panel: Add support for Samsung EA8076 AMOLED panel
Alicja Michalska
alicja.michalska at 9elements.com
Wed Jul 23 14:52:10 UTC 2025
Signed-off-by: Alicja Michalska <alicja.michalska at 9elements.com>
---
MAINTAINERS | 6 +
drivers/gpu/drm/panel/Kconfig | 7 +
drivers/gpu/drm/panel/Makefile | 1 +
drivers/gpu/drm/panel/panel-samsung-ea8076.c | 274 +++++++++++++++++++
4 files changed, 288 insertions(+)
create mode 100644 drivers/gpu/drm/panel/panel-samsung-ea8076.c
diff --git a/MAINTAINERS b/MAINTAINERS
index dd844ac8d910..d392760bdc34 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7673,6 +7673,12 @@ S: Maintained
F: Documentation/devicetree/bindings/display/panel/samsung,s6d7aa0.yaml
F: drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c
+DRM DRIVER FOR SAMSUNG EA8076 PANELS
+M: Alicja Michalska <alicja.michalska at 9elements.com>
+S: Maintained
+F: Documentation/devicetree/bindings/display/panel/samsung,ea8076.yaml
+F: drivers/gpu/drm/panel/panel-samsung-ea8076.c
+
DRM DRIVER FOR SAMSUNG S6E3HA8 PANELS
M: Dzmitry Sankouski <dsankouski at gmail.com>
S: Maintained
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index c288dcc87d98..5b594f25a03c 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -729,6 +729,13 @@ config DRM_PANEL_SAMSUNG_S6D7AA0
select DRM_MIPI_DSI
select VIDEOMODE_HELPERS
+config DRM_PANEL_SAMSUNG_EA8076
+ tristate "Samsung EA8076 DSI video mode panel"
+ depends on OF
+ depends on DRM_MIPI_DSI
+ depends on BACKLIGHT_CLASS_DEVICE
+ 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 40b1693988d6..ce4ea1a9fc61 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -72,6 +72,7 @@ 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-$(CONFIG_DRM_PANEL_SAMSUNG_EA8076) += panel-samsung-ea8076.o
obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E3FA7) += panel-samsung-s6e3fa7.o
obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E3HA2) += panel-samsung-s6e3ha2.o
obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E3HA8) += panel-samsung-s6e3ha8.o
diff --git a/drivers/gpu/drm/panel/panel-samsung-ea8076.c b/drivers/gpu/drm/panel/panel-samsung-ea8076.c
new file mode 100644
index 000000000000..2b01ab113c63
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-samsung-ea8076.c
@@ -0,0 +1,274 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/*
+ * Samsung EA8076 (1080x2340 AMOLED) panel driver
+ * Copyright (c) 2025 Alicja Michalska <alicja.michalska at 9elements.com>
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.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 ea8076 {
+ struct drm_panel panel;
+ struct mipi_dsi_device *dsi;
+ struct gpio_desc *reset_gpio;
+};
+
+static inline struct ea8076 *to_ea8076(struct drm_panel *panel)
+{
+ return container_of(panel, struct ea8076, panel);
+}
+
+static void ea8076_reset(struct ea8076 *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 ea8076_on(struct ea8076 *ctx)
+{
+ struct mipi_dsi_multi_context dsi_ctx = { .dsi = ctx->dsi };
+
+ mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+ mipi_dsi_usleep_range(&dsi_ctx, 10000, 11000);
+ mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf0, 0x5a, 0x5a);
+ mipi_dsi_dcs_set_tear_on_multi(&dsi_ctx, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
+ mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xb7, 0x01, 0x4b);
+ mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xb0, 0x06);
+ mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xb7, 0x10);
+ mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf0, 0xa5, 0xa5);
+ mipi_dsi_dcs_set_page_address_multi(&dsi_ctx, 0x0000, 0x0923);
+ mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf0, 0x5a, 0x5a);
+ mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xfc, 0x5a, 0x5a);
+ mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xe9,
+ 0x11, 0x75, 0xa6, 0x75, 0xa3, 0xb6, 0x85,
+ 0x7a, 0x00, 0x32, 0x32);
+ mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xe1,
+ 0x00, 0x00, 0x02, 0x02, 0x42, 0x02);
+ mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xe2,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
+ mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xb0, 0x0c);
+ mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xe1, 0x19);
+ mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf0, 0xa5, 0xa5);
+ mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xfc, 0xa5, 0xa5);
+ mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_WRITE_CONTROL_DISPLAY,
+ 0x20);
+ mipi_dsi_dcs_set_display_brightness_multi(&dsi_ctx, 0x0000);
+ mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_WRITE_POWER_SAVE, 0x00);
+ mipi_dsi_msleep(&dsi_ctx, 67);
+ mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+
+ return dsi_ctx.accum_err;
+}
+
+static int ea8076_off(struct ea8076 *ctx)
+{
+ struct mipi_dsi_multi_context dsi_ctx = { .dsi = ctx->dsi };
+
+ mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
+ mipi_dsi_msleep(&dsi_ctx, 35);
+ mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
+ mipi_dsi_msleep(&dsi_ctx, 120);
+
+ return dsi_ctx.accum_err;
+}
+
+static int ea8076_prepare(struct drm_panel *panel)
+{
+ struct ea8076 *ctx = to_ea8076(panel);
+ struct device *dev = &ctx->dsi->dev;
+ int ret;
+
+ ea8076_reset(ctx);
+
+ ret = ea8076_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 ea8076_unprepare(struct drm_panel *panel)
+{
+ struct ea8076 *ctx = to_ea8076(panel);
+ struct device *dev = &ctx->dsi->dev;
+ int ret;
+
+ ret = ea8076_off(ctx);
+ if (ret < 0)
+ dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
+
+ gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+
+ return 0;
+}
+
+static const struct drm_display_mode ea8076_mode = {
+ .clock = (1080 + 64 + 20 + 64) * (2340 + 64 + 20 + 64) * 60 / 1000,
+ .hdisplay = 1080,
+ .hsync_start = 1080 + 64,
+ .hsync_end = 1080 + 64 + 20,
+ .htotal = 1080 + 64 + 20 + 64,
+ .vdisplay = 2340,
+ .vsync_start = 2340 + 64,
+ .vsync_end = 2340 + 64 + 20,
+ .vtotal = 2340 + 64 + 20 + 64,
+ .width_mm = 69,
+ .height_mm = 147,
+ .type = DRM_MODE_TYPE_DRIVER,
+};
+
+static int ea8076_get_modes(struct drm_panel *panel,
+ struct drm_connector *connector)
+{
+ return drm_connector_helper_get_modes_fixed(connector, &ea8076_mode);
+}
+
+static const struct drm_panel_funcs ea8076_panel_funcs = {
+ .prepare = ea8076_prepare,
+ .unprepare = ea8076_unprepare,
+ .get_modes = ea8076_get_modes,
+};
+
+static int ea8076_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 ea8076_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 ea8076_bl_ops = {
+ .update_status = ea8076_bl_update_status,
+ .get_brightness = ea8076_bl_get_brightness,
+};
+
+static struct backlight_device *
+ea8076_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,
+ &ea8076_bl_ops, &props);
+}
+
+static int ea8076_probe(struct mipi_dsi_device *dsi)
+{
+ struct device *dev = &dsi->dev;
+ struct ea8076 *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, &ea8076_panel_funcs,
+ DRM_MODE_CONNECTOR_DSI);
+ ctx->panel.prepare_prev_first = true;
+
+ ctx->panel.backlight = ea8076_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 ea8076_remove(struct mipi_dsi_device *dsi)
+{
+ struct ea8076 *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 ea8076_of_match[] = {
+ { .compatible = "samsung,ea8076" },
+ { }
+};
+
+MODULE_DEVICE_TABLE(of, ea8076_of_match);
+
+static struct mipi_dsi_driver ea8076_driver = {
+ .probe = ea8076_probe,
+ .remove = ea8076_remove,
+ .driver = {
+ .name = "panel-samsung-ea8076",
+ .of_match_table = ea8076_of_match,
+ },
+};
+module_mipi_dsi_driver(ea8076_driver);
+
+MODULE_AUTHOR("Alicja Michalska <alicja.michalska at 9elements.com>");
+MODULE_DESCRIPTION("Samsung EA8076 panel driver");
+MODULE_LICENSE("GPL v2");
--
2.50.1
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