Signed-off-by: Alicja Michalska <alicja.michal...@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.michal...@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 <dsankou...@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.michal...@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.michal...@9elements.com>"); +MODULE_DESCRIPTION("Samsung EA8076 panel driver"); +MODULE_LICENSE("GPL v2"); -- 2.50.1