384 lines
11 KiB
Diff
384 lines
11 KiB
Diff
From d0ff75b09e66023c5f88992706dee4601aa7a437 Mon Sep 17 00:00:00 2001
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From: Teguh Sobirin <[email protected]>
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Date: Mon, 27 Oct 2025 16:53:15 +0800
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Subject: [PATCH] drm/panel: Add panel driver for DDIC CH13726A based panels
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Signed-off-by: Teguh Sobirin <[email protected]>
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---
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drivers/gpu/drm/panel/Kconfig | 11 +
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drivers/gpu/drm/panel/Makefile | 1 +
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drivers/gpu/drm/panel/panel-ddic-ch13726a.c | 327 ++++++++++++++++++++
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3 files changed, 339 insertions(+)
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create mode 100644 drivers/gpu/drm/panel/panel-ddic-ch13726a.c
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diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
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index cc2b93322628..fd889664ff6b 100644
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--- a/drivers/gpu/drm/panel/Kconfig
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+++ b/drivers/gpu/drm/panel/Kconfig
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@@ -126,6 +126,17 @@ config DRM_PANEL_CHIPONE_ICNA35XX
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around the Chipone ICNA3512 and ICNA3520 display controllers,
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such as some Tianma panels used in AYN Odin2 Portal and Thor.
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+config DRM_PANEL_DDIC_CH13726A
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+ tristate "DDIC CH13726A-based DSI panel"
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+ depends on OF
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+ depends on DRM_MIPI_DSI
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+ depends on BACKLIGHT_CLASS_DEVICE
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+ select DRM_DISPLAY_DP_HELPER
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+ select DRM_DISPLAY_HELPER
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+ help
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+ Say Y here if you want to enable support for DDIC CH13726A-based
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+ display panels.
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+
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config DRM_PANEL_EBBG_FT8719
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tristate "EBBG FT8719 panel driver"
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depends on OF
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diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
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index 339a5cb9f31b..c5f4f5f7bd82 100644
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--- a/drivers/gpu/drm/panel/Makefile
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+++ b/drivers/gpu/drm/panel/Makefile
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@@ -11,6 +11,7 @@ obj-$(CONFIG_DRM_PANEL_BOE_TV101WUM_LL2) += panel-boe-tv101wum-ll2.o
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obj-$(CONFIG_DRM_PANEL_BOE_TV101WUM_NL6) += panel-boe-tv101wum-nl6.o
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obj-$(CONFIG_DRM_PANEL_BOE_XM91080G) += panel-boe-xm91080g.o
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obj-$(CONFIG_DRM_PANEL_CHIPONE_ICNA35XX) += panel-chipone-icna35xx.o
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+obj-$(CONFIG_DRM_PANEL_DDIC_CH13726A) += panel-ddic-ch13726a.o
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obj-$(CONFIG_DRM_PANEL_DSI_CM) += panel-dsi-cm.o
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obj-$(CONFIG_DRM_PANEL_LVDS) += panel-lvds.o
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obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o
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diff --git a/drivers/gpu/drm/panel/panel-ddic-ch13726a.c b/drivers/gpu/drm/panel/panel-ddic-ch13726a.c
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new file mode 100644
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index 000000000000..946ad32f9b82
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--- /dev/null
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+++ b/drivers/gpu/drm/panel/panel-ddic-ch13726a.c
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@@ -0,0 +1,327 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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+/*
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+ * DDIC CH13726A MIPI-DSI panel driver
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+ * Copyright (c) 2024, Teguh Sobirin <[email protected]>.
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+ */
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+
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+#include <linux/backlight.h>
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+#include <linux/delay.h>
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+#include <linux/gpio/consumer.h>
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+#include <linux/module.h>
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+#include <linux/of.h>
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+#include <linux/regulator/consumer.h>
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+
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+#include <drm/drm_mipi_dsi.h>
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+#include <drm/drm_modes.h>
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+#include <drm/drm_panel.h>
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+
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+#include <video/mipi_display.h>
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+
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+struct ch13726a_panel {
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+ struct drm_panel panel;
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+ struct mipi_dsi_device *dsi;
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+ struct regulator_bulk_data supplies[4];
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+ struct gpio_desc *reset_gpio;
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+ const struct drm_display_mode *display_mode;
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+ enum drm_panel_orientation orientation;
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+ bool prepared;
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+};
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+
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+static inline struct ch13726a_panel *to_ch13726a_panel(struct drm_panel *panel)
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+{
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+ return container_of(panel, struct ch13726a_panel, panel);
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+}
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+
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+static void ch13726a_reset(struct ch13726a_panel *ctx)
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+{
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+ gpiod_set_value_cansleep(ctx->reset_gpio, 1);
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+ usleep_range(10000, 11000);
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+ gpiod_set_value_cansleep(ctx->reset_gpio, 0);
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+ usleep_range(10000, 11000);
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+ gpiod_set_value_cansleep(ctx->reset_gpio, 1);
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+ usleep_range(10000, 11000);
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+}
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+
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+static int ch13726a_on(struct ch13726a_panel *ctx)
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+{
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+ struct mipi_dsi_multi_context dsi_ctx = { .dsi = ctx->dsi };
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+
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+ ctx->dsi->mode_flags |= MIPI_DSI_MODE_LPM;
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+
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+ mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xf0, 0x50);
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+ mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb9, 0x00);
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+
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+ mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
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+
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+ mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
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+
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+ return dsi_ctx.accum_err;
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+}
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+
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+static int ch13726a_disable(struct drm_panel *panel)
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+{
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+ struct ch13726a_panel *ctx = to_ch13726a_panel(panel);
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+ struct mipi_dsi_multi_context dsi_ctx = { .dsi = ctx->dsi };
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+
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+ ctx->dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
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+
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+ mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
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+ mipi_dsi_msleep(&dsi_ctx, 50);
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+ mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
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+
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+ return dsi_ctx.accum_err;
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+}
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+
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+static int ch13726a_prepare(struct drm_panel *panel)
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+{
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+ struct ch13726a_panel *ctx = to_ch13726a_panel(panel);
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+ struct device *dev = &ctx->dsi->dev;
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+ int ret;
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+
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+ if (ctx->prepared)
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+ return 0;
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+
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+ ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
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+ if (ret < 0) {
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+ dev_err(dev, "Failed to enable regulators: %d\n", ret);
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+ return ret;
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+ }
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+
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+ ch13726a_reset(ctx);
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+
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+ ret = ch13726a_on(ctx);
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+ if (ret < 0) {
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+ dev_err(dev, "Failed to initialize panel: %d\n", ret);
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+ gpiod_set_value_cansleep(ctx->reset_gpio, 0);
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+ regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
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+ return ret;
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+ }
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+
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+ msleep(28);
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+
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+ ctx->prepared = true;
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+
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+ return 0;
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+}
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+
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+static int ch13726a_unprepare(struct drm_panel *panel)
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+{
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+ struct ch13726a_panel *ctx = to_ch13726a_panel(panel);
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+
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+ if (!ctx->prepared)
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+ return 0;
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+
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+ gpiod_set_value_cansleep(ctx->reset_gpio, 0);
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+ regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
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+
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+ ctx->prepared = false;
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+ return 0;
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+}
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+
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+static const struct drm_display_mode rp5_display_mode = {
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+ .clock = (1080 + 12 + 4 + 12) * (1920 + 12 + 4 + 12) * 60 / 1000,
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+ .hdisplay = 1080,
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+ .hsync_start = 1080 + 12,
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+ .hsync_end = 1080 + 12 + 4,
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+ .htotal = 1080 + 12 + 4 + 12,
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+ .vdisplay = 1920,
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+ .vsync_start = 1920 + 12,
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+ .vsync_end = 1920 + 12 + 4,
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+ .vtotal = 1920 + 12 + 4 + 12,
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+ .width_mm = 68,
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+ .height_mm = 121,
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+};
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+
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+static const struct drm_display_mode rpmini_display_mode = {
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+ .clock = (960 + 28 + 4 + 36) * (1280 + 16 + 4 + 8) * 60 / 1000,
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+ .hdisplay = 960,
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+ .hsync_start = 960 + 28,
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+ .hsync_end = 960 + 28 + 4,
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+ .htotal = 960 + 28 + 4 + 36,
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+ .vdisplay = 1280,
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+ .vsync_start = 1280 + 16,
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+ .vsync_end = 1280 + 16 + 4,
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+ .vtotal = 1280 + 16 + 4 + 8,
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+ .width_mm = 65,
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+ .height_mm = 75,
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+};
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+
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+static const struct drm_display_mode rpminiv2_display_mode = {
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+ .clock = (1080 + 28 + 4 + 36) * (1240 + 16 + 4 + 8) * 60 / 1000,
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+ .hdisplay = 1080,
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+ .hsync_start = 1080 + 28,
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+ .hsync_end = 1080 + 28 + 4,
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+ .htotal = 1080 + 28 + 4 + 36,
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+ .vdisplay = 1240,
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+ .vsync_start = 1240 + 16,
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+ .vsync_end = 1240 + 16 + 4,
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+ .vtotal = 1240 + 16 + 4 + 8,
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+ .width_mm = 65,
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+ .height_mm = 75,
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+};
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+
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+static int ch13726a_get_modes(struct drm_panel *panel,
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+ struct drm_connector *connector)
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+{
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+ struct ch13726a_panel *ctx = to_ch13726a_panel(panel);
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+ struct drm_display_mode *mode;
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+
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+ mode = drm_mode_duplicate(connector->dev, ctx->display_mode);
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+ if (!mode)
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+ return -ENOMEM;
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+
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+ drm_mode_set_name(mode);
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+
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+ mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
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+ connector->display_info.width_mm = mode->width_mm;
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+ connector->display_info.height_mm = mode->height_mm;
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+ drm_mode_probed_add(connector, mode);
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+
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+ return 1;
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+}
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+
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+static enum drm_panel_orientation ch13726a_get_orientation(struct drm_panel *panel)
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+{
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+ struct ch13726a_panel *ctx = to_ch13726a_panel(panel);
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+
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+ return ctx->orientation;
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+}
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+
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+static const struct drm_panel_funcs ch13726a_panel_funcs = {
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+ .prepare = ch13726a_prepare,
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+ .unprepare = ch13726a_unprepare,
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+ .disable = ch13726a_disable,
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+ .get_modes = ch13726a_get_modes,
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+ .get_orientation = ch13726a_get_orientation,
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+};
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+
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+static int ch13726a_bl_update_status(struct backlight_device *bl)
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+{
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+ struct mipi_dsi_device *dsi = bl_get_data(bl);
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+ u16 brightness = backlight_get_brightness(bl);
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+ int ret;
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+
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+ dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
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+
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+ ret = mipi_dsi_dcs_set_display_brightness(dsi, brightness);
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+ if (ret < 0)
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+ return ret;
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+
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+ dsi->mode_flags |= MIPI_DSI_MODE_LPM;
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+
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+ return 0;
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+}
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+
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+static const struct backlight_ops ch13726a_bl_ops = {
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+ .update_status = ch13726a_bl_update_status,
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+};
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+
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+static struct backlight_device *
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+ch13726a_create_backlight(struct mipi_dsi_device *dsi)
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+{
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+ struct device *dev = &dsi->dev;
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+ const struct backlight_properties props = {
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+ .type = BACKLIGHT_RAW,
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+ .brightness = 255,
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+ .max_brightness = 255,
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+ };
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+
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+ return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
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+ &ch13726a_bl_ops, &props);
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+}
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+
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+static int ch13726a_probe(struct mipi_dsi_device *dsi)
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+{
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+ struct device *dev = &dsi->dev;
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+ struct ch13726a_panel *ctx;
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+ int ret;
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+
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+ ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
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+ if (!ctx)
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+ return -ENOMEM;
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+
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+ ctx->display_mode = of_device_get_match_data(dev);
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+
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+ ctx->supplies[0].supply = "vdd1v2";
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+ ctx->supplies[1].supply = "vddio";
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+ ctx->supplies[2].supply = "vdd";
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+ ctx->supplies[3].supply = "avdd";
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+
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+ ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
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+ ctx->supplies);
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+ if (ret < 0)
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+ return dev_err_probe(dev, ret, "Failed to get regulators\n");
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+
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+ ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
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+ if (IS_ERR(ctx->reset_gpio))
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+ return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
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+ "Failed to get reset-gpios\n");
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+
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+ ret = of_drm_get_panel_orientation(dev->of_node, &ctx->orientation);
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+ if (ret < 0) {
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+ dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, ret);
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+ return ret;
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+ }
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+
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+ ctx->dsi = dsi;
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+ mipi_dsi_set_drvdata(dsi, ctx);
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+
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+ dsi->lanes = 4;
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+ dsi->format = MIPI_DSI_FMT_RGB888;
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+ dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
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+ MIPI_DSI_CLOCK_NON_CONTINUOUS;
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+
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+ drm_panel_init(&ctx->panel, dev, &ch13726a_panel_funcs,
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+ DRM_MODE_CONNECTOR_DSI);
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+ ctx->panel.prepare_prev_first = true;
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+
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+ ctx->panel.backlight = ch13726a_create_backlight(dsi);
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+ if (IS_ERR(ctx->panel.backlight))
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+ return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight),
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+ "Failed to create backlight\n");
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+
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+ drm_panel_add(&ctx->panel);
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+
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+ ret = mipi_dsi_attach(dsi);
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+ if (ret < 0) {
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+ dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
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+ drm_panel_remove(&ctx->panel);
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+ return ret;
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+ }
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+
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+ return 0;
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+}
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+
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+static void ch13726a_remove(struct mipi_dsi_device *dsi)
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+{
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+ struct ch13726a_panel *ctx = mipi_dsi_get_drvdata(dsi);
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+ int ret;
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+
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+ ret = mipi_dsi_detach(dsi);
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+ if (ret < 0)
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+ dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
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+
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+ drm_panel_remove(&ctx->panel);
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+}
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+
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+static const struct of_device_id ch13726a_of_match[] = {
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+ { .compatible = "ch13726a,rp5", .data = &rp5_display_mode },
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+ { .compatible = "ch13726a,rpmini", .data = &rpmini_display_mode },
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+ { .compatible = "ch13726a,rpminiv2", .data = &rpminiv2_display_mode },
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+ { .compatible = "ch13726a,thor", .data = &rpminiv2_display_mode },
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+ { /* sentinel */ }
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+};
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+MODULE_DEVICE_TABLE(of, ch13726a_of_match);
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+
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+static struct mipi_dsi_driver ch13726a_driver = {
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+ .probe = ch13726a_probe,
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+ .remove = ch13726a_remove,
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+ .driver = {
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+ .name = "panel-ch13726a-amoled",
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+ .of_match_table = ch13726a_of_match,
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+ },
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+};
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+module_mipi_dsi_driver(ch13726a_driver);
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+
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+MODULE_DESCRIPTION("DRM driver for CH13726A DSI panels");
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+MODULE_LICENSE("GPL");
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--
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2.34.1
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