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From: Aaron Kling via B4 Relay <devnull+webgeek1234.gmail.com@kernel.org>
Date: Tue, 17 Mar 2026 00:23:08 -0500
Subject: [PATCH v2 2/2] drm/panel: Add panel driver for ChipWealth CH13726A
 based panels
Precedence: bulk
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Message-Id: <20260317-ch13726a-v2-2-28aa46bcd6d0@gmail.com>
References: <20260317-ch13726a-v2-0-28aa46bcd6d0@gmail.com>
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To: Neil Armstrong <neil.armstrong@linaro.org>,
 Jessica Zhang <jesszhan0024@gmail.com>,
 Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
 Maxime Ripard <mripard@kernel.org>, Thomas Zimmermann <tzimmermann@suse.de>,
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 Conor Dooley <conor+dt@kernel.org>
Cc: dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
 linux-kernel@vger.kernel.org, Teguh Sobirin <teguh@sobir.in>,
 Aaron Kling <webgeek1234@gmail.com>
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Reply-To: webgeek1234@gmail.com

From: Teguh Sobirin <teguh@sobir.in>

This is used by the AYN Thor for the bottom panel.

Signed-off-by: Teguh Sobirin <teguh@sobir.in>
Co-developed-by: Aaron Kling <webgeek1234@gmail.com>
Signed-off-by: Aaron Kling <webgeek1234@gmail.com>
---
 drivers/gpu/drm/panel/Kconfig                     |  11 +
 drivers/gpu/drm/panel/Makefile                    |   1 +
 drivers/gpu/drm/panel/panel-chipwealth-ch13726a.c | 339 ++++++++++++++++++=
++++
 3 files changed, 351 insertions(+)

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index a99f2e2a49fe66a09c6f2d503f570b05a5e228b1..e953b61a819082866b93d0a453e=
e750a76d70c18 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -105,6 +105,17 @@ config DRM_PANEL_BOE_TV101WUM_LL2
 	  Say Y here if you want to support for BOE TV101WUM-LL2
 	  WUXGA PANEL DSI Video Mode panel
=20
+config DRM_PANEL_CHIPWEALTH_CH13726A
+	tristate "CHIPWEALTH CH13726A-based DSI panel"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
+	select DRM_DISPLAY_DP_HELPER
+	select DRM_DISPLAY_HELPER
+	help
+	  Say Y here if you want to enable support for ChipWealth
+	  CH13726A-based display panels.
+
 config DRM_PANEL_EBBG_FT8719
 	tristate "EBBG FT8719 panel driver"
 	depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 3336a2c0cd86419b6a22f74dcde6df966a311da9..85da2eb5a5c664d4302837f52e7=
e10ec11da8966 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_DRM_PANEL_BOE_TD4320) +=3D panel-boe-td4320.o
 obj-$(CONFIG_DRM_PANEL_BOE_TH101MB31UIG002_28A) +=3D panel-boe-th101mb31ig=
002-28a.o
 obj-$(CONFIG_DRM_PANEL_BOE_TV101WUM_LL2) +=3D panel-boe-tv101wum-ll2.o
 obj-$(CONFIG_DRM_PANEL_BOE_TV101WUM_NL6) +=3D panel-boe-tv101wum-nl6.o
+obj-$(CONFIG_DRM_PANEL_CHIPWEALTH_CH13726A) +=3D panel-chipwealth-ch13726a=
.o
 obj-$(CONFIG_DRM_PANEL_DSI_CM) +=3D panel-dsi-cm.o
 obj-$(CONFIG_DRM_PANEL_LVDS) +=3D panel-lvds.o
 obj-$(CONFIG_DRM_PANEL_SIMPLE) +=3D panel-simple.o
diff --git a/drivers/gpu/drm/panel/panel-chipwealth-ch13726a.c b/drivers/gp=
u/drm/panel/panel-chipwealth-ch13726a.c
new file mode 100644
index 0000000000000000000000000000000000000000..48a5e20e07c48748e073f8bb914=
7036c18c51caa
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-chipwealth-ch13726a.c
@@ -0,0 +1,339 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ChipWealth CH13726A MIPI-DSI panel driver
+ * Copyright (c) 2024, Teguh Sobirin <teguh@sobir.in>.
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+
+#include <video/mipi_display.h>
+
+struct ch13726a_panel {
+	struct drm_panel panel;
+	struct mipi_dsi_device *dsi;
+	struct regulator_bulk_data supplies[4];
+	struct gpio_desc *reset_gpio;
+	struct ch13726a_desc *desc;
+	enum drm_panel_orientation orientation;
+	bool prepared;
+};
+
+struct ch13726a_desc {
+	unsigned int width_mm;
+	unsigned int height_mm;
+	unsigned int bpc;
+
+	const struct drm_display_mode *modes;
+	unsigned int num_modes;
+};
+
+static inline struct ch13726a_panel *to_ch13726a_panel(struct drm_panel *p=
anel)
+{
+	return container_of(panel, struct ch13726a_panel, panel);
+}
+
+static void ch13726a_reset(struct ch13726a_panel *ctx)
+{
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	usleep_range(10000, 11000);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(10000, 11000);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	usleep_range(10000, 11000);
+}
+
+static int ch13726a_on(struct ch13726a_panel *ctx)
+{
+	struct mipi_dsi_multi_context dsi_ctx =3D { .dsi =3D ctx->dsi };
+
+	ctx->dsi->mode_flags |=3D MIPI_DSI_MODE_LPM;
+
+	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xf0, 0x50);
+	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb9, 0x00);
+
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+
+	return dsi_ctx.accum_err;
+}
+
+static int ch13726a_disable(struct drm_panel *panel)
+{
+	struct ch13726a_panel *ctx =3D to_ch13726a_panel(panel);
+	struct mipi_dsi_multi_context dsi_ctx =3D { .dsi =3D ctx->dsi };
+
+	ctx->dsi->mode_flags &=3D ~MIPI_DSI_MODE_LPM;
+
+	mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 50);
+	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
+
+	return dsi_ctx.accum_err;
+}
+
+static int ch13726a_prepare(struct drm_panel *panel)
+{
+	struct ch13726a_panel *ctx =3D to_ch13726a_panel(panel);
+	struct device *dev =3D &ctx->dsi->dev;
+	int ret;
+
+	if (ctx->prepared)
+		return 0;
+
+	ret =3D regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable regulators: %d\n", ret);
+		return ret;
+	}
+
+	ch13726a_reset(ctx);
+
+	ret =3D ch13726a_on(ctx);
+	if (ret < 0) {
+		dev_err(dev, "Failed to initialize panel: %d\n", ret);
+		gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+		regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+		return ret;
+	}
+
+	msleep(28);
+
+	ctx->prepared =3D true;
+
+	return 0;
+}
+
+static int ch13726a_unprepare(struct drm_panel *panel)
+{
+	struct ch13726a_panel *ctx =3D to_ch13726a_panel(panel);
+
+	if (!ctx->prepared)
+		return 0;
+
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+
+	ctx->prepared =3D false;
+	return 0;
+}
+
+static const struct drm_display_mode thor_bottom_modes[] =3D {
+	{
+		/* 120Hz */
+		.clock =3D (1080 + 28 + 4 + 36) * (1240 + 16 + 4 + 8) * 120 / 1000,
+		.hdisplay =3D 1080,
+		.hsync_start =3D 1080 + 28,
+		.hsync_end =3D 1080 + 28 + 4,
+		.htotal =3D 1080 + 28 + 4 + 36,
+		.vdisplay =3D 1240,
+		.vsync_start =3D 1240 + 16,
+		.vsync_end =3D 1240 + 16 + 4,
+		.vtotal =3D 1240 + 16 + 4 + 8,
+	},
+	{
+		/* 60Hz */
+		.clock =3D (1080 + 28 + 4 + 36) * (1240 + 16 + 4 + 8) * 60 / 1000,
+		.hdisplay =3D 1080,
+		.hsync_start =3D 1080 + 28,
+		.hsync_end =3D 1080 + 28 + 4,
+		.htotal =3D 1080 + 28 + 4 + 36,
+		.vdisplay =3D 1240,
+		.vsync_start =3D 1240 + 16,
+		.vsync_end =3D 1240 + 16 + 4,
+		.vtotal =3D 1240 + 16 + 4 + 8,
+	}
+};
+
+static struct ch13726a_desc thor_bottom_desc =3D {
+	.modes =3D thor_bottom_modes,
+	.num_modes =3D ARRAY_SIZE(thor_bottom_modes),
+	.width_mm =3D 65,
+	.height_mm =3D 75,
+	.bpc =3D 8,
+};
+
+static int ch13726a_get_modes(struct drm_panel *panel,
+					struct drm_connector *connector)
+{
+	struct ch13726a_panel *ctx =3D to_ch13726a_panel(panel);
+
+	for (uint8_t i =3D 0; i < ctx->desc->num_modes; i++) {
+		const struct drm_display_mode *m =3D &ctx->desc->modes[i];
+		struct drm_display_mode *mode;
+
+		mode =3D drm_mode_duplicate(connector->dev, m);
+		if (!mode) {
+			dev_err(&ctx->dsi->dev, "failed to add mode %ux%u@%u\n",
+				m->hdisplay, m->vdisplay, drm_mode_vrefresh(m));
+			return -ENOMEM;
+		}
+
+		mode->type =3D DRM_MODE_TYPE_DRIVER;
+		if (i =3D=3D 0)
+			mode->type |=3D DRM_MODE_TYPE_PREFERRED;
+
+		drm_mode_set_name(mode);
+		drm_mode_probed_add(connector, mode);
+	}
+
+	connector->display_info.width_mm =3D ctx->desc->width_mm;
+	connector->display_info.height_mm =3D ctx->desc->height_mm;
+	connector->display_info.bpc =3D ctx->desc->bpc;
+
+	return ctx->desc->num_modes;
+}
+
+static enum drm_panel_orientation ch13726a_get_orientation(struct drm_pane=
l *panel)
+{
+	struct ch13726a_panel *ctx =3D to_ch13726a_panel(panel);
+
+	return ctx->orientation;
+}
+
+static const struct drm_panel_funcs ch13726a_panel_funcs =3D {
+	.prepare =3D ch13726a_prepare,
+	.unprepare =3D ch13726a_unprepare,
+	.disable =3D ch13726a_disable,
+	.get_modes =3D ch13726a_get_modes,
+	.get_orientation =3D ch13726a_get_orientation,
+};
+
+static int ch13726a_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(dsi, brightness);
+	if (ret < 0)
+		return ret;
+
+	dsi->mode_flags |=3D MIPI_DSI_MODE_LPM;
+
+	return 0;
+}
+
+static const struct backlight_ops ch13726a_bl_ops =3D {
+	.update_status =3D ch13726a_bl_update_status,
+};
+
+static struct backlight_device *
+ch13726a_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 255,
+		.max_brightness =3D 255,
+	};
+
+	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
+					      &ch13726a_bl_ops, &props);
+}
+
+static int ch13726a_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev =3D &dsi->dev;
+	struct ch13726a_panel *ctx;
+	int ret;
+
+	ctx =3D devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->desc =3D (struct ch13726a_desc *)of_device_get_match_data(dev);
+	if (!ctx->desc)
+		return -ENODEV;
+
+	ctx->supplies[0].supply =3D "vdd1v2";
+	ctx->supplies[1].supply =3D "vddio";
+	ctx->supplies[2].supply =3D "vdd";
+	ctx->supplies[3].supply =3D "avdd";
+
+	ret =3D 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 =3D devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(ctx->reset_gpio))
+		return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
+				     "Failed to get reset-gpios\n");
+
+	ret =3D of_drm_get_panel_orientation(dev->of_node, &ctx->orientation);
+	if (ret < 0) {
+		dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, ret);
+		return ret;
+	}
+
+	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_CLOCK_NON_CONTINUOUS;
+
+	drm_panel_init(&ctx->panel, dev, &ch13726a_panel_funcs,
+		       DRM_MODE_CONNECTOR_DSI);
+	ctx->panel.prepare_prev_first =3D true;
+
+	ctx->panel.backlight =3D ch13726a_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) {
+		dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
+		drm_panel_remove(&ctx->panel);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void ch13726a_remove(struct mipi_dsi_device *dsi)
+{
+	struct ch13726a_panel *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 ch13726a_of_match[] =3D {
+	{ .compatible =3D "ayntec,thor-panel-bottom", .data =3D &thor_bottom_desc=
 },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ch13726a_of_match);
+
+static struct mipi_dsi_driver ch13726a_driver =3D {
+	.probe =3D ch13726a_probe,
+	.remove =3D ch13726a_remove,
+	.driver =3D {
+		.name =3D "panel-ch13726a-amoled",
+		.of_match_table =3D ch13726a_of_match,
+	},
+};
+module_mipi_dsi_driver(ch13726a_driver);
+
+MODULE_DESCRIPTION("DRM driver for CH13726A DSI panels");
+MODULE_LICENSE("GPL");

--=20
2.53.0