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From: Langyan Ye <yelangyan@huaqin.corp-partner.google.com>
To: neil.armstrong@linaro.org,
	jessica.zhang@oss.qualcomm.com,
	airlied@gmail.com,
	simona@ffwll.ch,
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Cc: dri-devel@lists.freedesktop.org,
	devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Langyan Ye <yelangyan@huaqin.corp-partner.google.com>
Subject: [PATCH v1 2/2] drm/panel: Add driver for Tianma TL121BVMS07-00 panel
Date: Tue, 30 Sep 2025 15:50:44 +0800
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 <20250930075044.1368134-3-yelangyan@huaqin.corp-partner.google.com>
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Add a DRM panel driver for the Tianma TL121BVMS07-00 12.1"
MIPI-DSI TFT LCD panel. The panel requires multiple power
supplies (AVDD, AVEE, 1.8V logic), an enable GPIO, and a
backlight device. The panel is based on the Ilitek IL79900A
controller.

Signed-off-by: Langyan Ye <yelangyan@huaqin.corp-partner.google.com>
---
 .../drm/panel/panel-tianma-tl121bvms07-00.c   | 419 ++++++++++++++++++
 1 file changed, 419 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-tianma-tl121bvms07-00.c

diff --git a/drivers/gpu/drm/panel/panel-tianma-tl121bvms07-00.c b/drivers/=
gpu/drm/panel/panel-tianma-tl121bvms07-00.c
new file mode 100644
index 000000000000..5facffeda864
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-tianma-tl121bvms07-00.c
@@ -0,0 +1,419 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * DRM panel driver for Tianma TL121BVMS07-00 12.1" MIPI-DSI TFT LCD panel
+ *
+ * Based on drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
+ */
+
+
+#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_connector.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_panel.h>
+
+#include <video/mipi_display.h>
+
+struct tm_panel;
+
+struct panel_desc {
+	const struct drm_display_mode *modes;
+	unsigned int bpc;
+
+	/**
+	 * @width_mm: width of the panel's active display area
+	 * @height_mm: height of the panel's active display area
+	 */
+	struct {
+		unsigned int width_mm;
+		unsigned int height_mm;
+	} size;
+
+	unsigned long mode_flags;
+	enum mipi_dsi_pixel_format format;
+	int (*init)(struct tm_panel *tm);
+	unsigned int lanes;
+	bool discharge_on_disable;
+	bool lp11_before_reset;
+};
+
+struct tm_panel {
+	struct drm_panel base;
+	struct mipi_dsi_device *dsi;
+
+	const struct panel_desc *desc;
+
+	enum drm_panel_orientation orientation;
+	struct regulator *pp1800;
+	struct regulator *avee;
+	struct regulator *avdd;
+	struct gpio_desc *enable_gpio;
+
+	bool prepared;
+};
+
+static int tm_tl121bvms07_00_init(struct tm_panel *tm)
+{
+	struct mipi_dsi_multi_context ctx =3D { .dsi =3D tm->dsi };
+	struct mipi_dsi_device *dsi =3D ctx.dsi;
+
+	mipi_dsi_dcs_write_seq_multi(&ctx, 0xff, 0x5a, 0xa5, 0x06);
+	mipi_dsi_dcs_write_seq_multi(&ctx, 0x3e, 0x62);
+
+
+	mipi_dsi_generic_write_seq(dsi, 0xff, 0x5a, 0xa5, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&ctx, 0x1b, 0x20);
+	mipi_dsi_dcs_write_seq_multi(&ctx, 0x5d, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&ctx, 0x5e, 0x40);
+
+	mipi_dsi_dcs_write_seq_multi(&ctx, 0xff, 0x5a, 0xa5, 0x07);
+	mipi_dsi_dcs_write_seq_multi(&ctx, 0X29, 0x00);
+
+	mipi_dsi_generic_write_seq(dsi, 0xff, 0x5a, 0xa5, 0x00);
+
+	mipi_dsi_dcs_write_seq_multi(&ctx, 0X11);
+
+	if (ctx.accum_err)
+		return ctx.accum_err;
+
+	msleep(120);
+
+	mipi_dsi_dcs_write_seq_multi(&ctx, 0X29);
+
+	if (ctx.accum_err)
+		return ctx.accum_err;
+
+	msleep(80);
+
+	return 0;
+};
+
+static inline struct tm_panel *to_tm_panel(struct drm_panel *panel)
+{
+	return container_of(panel, struct tm_panel, base);
+}
+
+static int tm_panel_enter_sleep_mode(struct tm_panel *tm)
+{
+	struct mipi_dsi_device *dsi =3D tm->dsi;
+	int ret;
+
+	dsi->mode_flags &=3D ~MIPI_DSI_MODE_LPM;
+
+	ret =3D mipi_dsi_dcs_set_display_off(dsi);
+	if (ret < 0)
+		return ret;
+
+	ret =3D mipi_dsi_dcs_enter_sleep_mode(dsi);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int tm_panel_disable(struct drm_panel *panel)
+{
+	struct tm_panel *tm =3D to_tm_panel(panel);
+	int ret;
+
+	ret =3D tm_panel_enter_sleep_mode(tm);
+	if (ret < 0) {
+		dev_err(panel->dev, "failed to set panel off: %d\n", ret);
+		return ret;
+	}
+
+	msleep(150);
+
+	return 0;
+}
+
+static int tm_panel_unprepare(struct drm_panel *panel)
+{
+	struct tm_panel *tm =3D to_tm_panel(panel);
+
+	if (!tm->prepared)
+		return 0;
+
+	if (tm->desc->discharge_on_disable) {
+		regulator_disable(tm->avee);
+		regulator_disable(tm->avdd);
+		usleep_range(5000, 7000);
+		gpiod_set_value(tm->enable_gpio, 0);
+		usleep_range(5000, 7000);
+		regulator_disable(tm->pp1800);
+	} else {
+		gpiod_set_value(tm->enable_gpio, 0);
+		usleep_range(1000, 2000);
+		regulator_disable(tm->avee);
+		regulator_disable(tm->avdd);
+		usleep_range(5000, 7000);
+		regulator_disable(tm->pp1800);
+	}
+
+	tm->prepared =3D false;
+
+	return 0;
+}
+
+static int tm_panel_prepare(struct drm_panel *panel)
+{
+	struct tm_panel *tm =3D to_tm_panel(panel);
+	int ret;
+
+	if (tm->prepared)
+		return 0;
+
+	ret =3D regulator_enable(tm->pp1800);
+	if (ret < 0)
+		return ret;
+
+	usleep_range(6000, 8000);
+
+	ret =3D regulator_enable(tm->avdd);
+	if (ret < 0)
+		goto poweroff1v8;
+	ret =3D regulator_enable(tm->avee);
+	if (ret < 0)
+		goto poweroffavdd;
+
+	usleep_range(11000, 12000);
+
+	gpiod_set_value(tm->enable_gpio, 1);
+
+	if (tm->desc->lp11_before_reset) {
+		ret =3D mipi_dsi_dcs_nop(tm->dsi);
+		if (ret < 0) {
+			dev_err(&tm->dsi->dev, "Failed to send NOP: %d\n", ret);
+			goto poweroff;
+		}
+		usleep_range(1000, 2000);
+	}
+	gpiod_set_value(tm->enable_gpio, 0);
+	usleep_range(1000, 2000);
+	gpiod_set_value(tm->enable_gpio, 1);
+	usleep_range(20000, 21000);
+
+	ret =3D tm->desc->init(tm);
+	if (ret < 0)
+		goto poweroff;
+
+	tm->prepared =3D true;
+	return 0;
+
+poweroff:
+	gpiod_set_value(tm->enable_gpio, 0);
+	regulator_disable(tm->avee);
+poweroffavdd:
+	regulator_disable(tm->avdd);
+poweroff1v8:
+	usleep_range(5000, 7000);
+	regulator_disable(tm->pp1800);
+
+	return ret;
+}
+
+static int tm_panel_enable(struct drm_panel *panel)
+{
+	msleep(130);
+	return 0;
+}
+
+static const struct drm_display_mode tm_tl121bvms07_00_default_mode =3D {
+	.clock =3D 264355,
+	.hdisplay =3D 1600,
+	.hsync_start =3D 1600 + 20,
+	.hsync_end =3D 1600 + 20 + 4,
+	.htotal =3D 1600 + 20 + 4 + 20,
+	.vdisplay =3D 2560,
+	.vsync_start =3D 2560 + 82,
+	.vsync_end =3D 2560 + 82 + 2,
+	.vtotal =3D 2560 + 82 + 2 + 36,
+};
+
+static const struct panel_desc tm_tl121bvms07_00_desc =3D {
+	.modes =3D &tm_tl121bvms07_00_default_mode,
+	.bpc =3D 8,
+	.size =3D {
+		.width_mm =3D 163,
+		.height_mm =3D 260,
+	},
+	.lanes =3D 3,
+	.format =3D MIPI_DSI_FMT_RGB888,
+	.mode_flags =3D MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
+		      MIPI_DSI_MODE_LPM,
+	.init =3D tm_tl121bvms07_00_init,
+	.lp11_before_reset =3D true,
+};
+
+static int tm_panel_get_modes(struct drm_panel *panel,
+			       struct drm_connector *connector)
+{
+	struct tm_panel *tm =3D to_tm_panel(panel);
+	const struct drm_display_mode *m =3D tm->desc->modes;
+	struct drm_display_mode *mode;
+
+	mode =3D drm_mode_duplicate(connector->dev, m);
+	if (!mode) {
+		dev_err(panel->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 | DRM_MODE_TYPE_PREFERRED;
+	drm_mode_set_name(mode);
+	drm_mode_probed_add(connector, mode);
+
+	connector->display_info.width_mm =3D tm->desc->size.width_mm;
+	connector->display_info.height_mm =3D tm->desc->size.height_mm;
+	connector->display_info.bpc =3D tm->desc->bpc;
+	/*
+	 * TODO: Remove once all drm drivers call
+	 * drm_connector_set_orientation_from_panel()
+	 */
+	drm_connector_set_panel_orientation(connector, tm->orientation);
+
+	return 1;
+}
+
+static enum drm_panel_orientation tm_panel_get_orientation(struct drm_pane=
l *panel)
+{
+	struct tm_panel *tm =3D to_tm_panel(panel);
+
+	return tm->orientation;
+}
+
+static const struct drm_panel_funcs tm_panel_funcs =3D {
+	.disable =3D tm_panel_disable,
+	.unprepare =3D tm_panel_unprepare,
+	.prepare =3D tm_panel_prepare,
+	.enable =3D tm_panel_enable,
+	.get_modes =3D tm_panel_get_modes,
+	.get_orientation =3D tm_panel_get_orientation,
+};
+
+static int tm_panel_add(struct tm_panel *tm)
+{
+	struct device *dev =3D &tm->dsi->dev;
+	int err;
+
+	tm->avdd =3D devm_regulator_get(dev, "avdd");
+	if (IS_ERR(tm->avdd))
+		return PTR_ERR(tm->avdd);
+
+	tm->avee =3D devm_regulator_get(dev, "avee");
+	if (IS_ERR(tm->avee))
+		return PTR_ERR(tm->avee);
+
+	tm->pp1800 =3D devm_regulator_get(dev, "pp1800");
+	if (IS_ERR(tm->pp1800))
+		return PTR_ERR(tm->pp1800);
+
+	tm->enable_gpio =3D devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
+	if (IS_ERR(tm->enable_gpio)) {
+		dev_err(dev, "cannot get reset-gpios %ld\n",
+			PTR_ERR(tm->enable_gpio));
+		return PTR_ERR(tm->enable_gpio);
+	}
+
+	gpiod_set_value(tm->enable_gpio, 0);
+
+	tm->base.prepare_prev_first =3D true;
+
+	drm_panel_init(&tm->base, dev, &tm_panel_funcs,
+		       DRM_MODE_CONNECTOR_DSI);
+	err =3D of_drm_get_panel_orientation(dev->of_node, &tm->orientation);
+	if (err < 0) {
+		dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, err);
+		return err;
+	}
+
+	err =3D drm_panel_of_backlight(&tm->base);
+	if (err)
+		return err;
+
+	tm->base.funcs =3D &tm_panel_funcs;
+	tm->base.dev =3D &tm->dsi->dev;
+
+	drm_panel_add(&tm->base);
+
+	return 0;
+}
+
+static int tm_panel_probe(struct mipi_dsi_device *dsi)
+{
+	struct tm_panel *tm;
+	int ret;
+	const struct panel_desc *desc;
+
+	tm =3D devm_kzalloc(&dsi->dev, sizeof(*tm), GFP_KERNEL);
+	if (!tm)
+		return -ENOMEM;
+
+	desc =3D of_device_get_match_data(&dsi->dev);
+	dsi->lanes =3D desc->lanes;
+	dsi->format =3D desc->format;
+	dsi->mode_flags =3D desc->mode_flags;
+	tm->desc =3D desc;
+	tm->dsi =3D dsi;
+	ret =3D tm_panel_add(tm);
+	if (ret < 0)
+		return ret;
+
+	mipi_dsi_set_drvdata(dsi, tm);
+
+	ret =3D mipi_dsi_attach(dsi);
+	if (ret)
+		drm_panel_remove(&tm->base);
+	return ret;
+}
+
+static void tm_panel_shutdown(struct mipi_dsi_device *dsi)
+{
+	struct tm_panel *tm =3D mipi_dsi_get_drvdata(dsi);
+
+	drm_panel_disable(&tm->base);
+	drm_panel_unprepare(&tm->base);
+}
+
+static void tm_panel_remove(struct mipi_dsi_device *dsi)
+{
+	struct tm_panel *tm =3D mipi_dsi_get_drvdata(dsi);
+	int ret;
+
+	tm_panel_shutdown(dsi);
+
+	ret =3D mipi_dsi_detach(dsi);
+	if (ret < 0)
+		dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
+
+	if (tm->base.dev)
+		drm_panel_remove(&tm->base);
+}
+
+static const struct of_device_id tm_of_match[] =3D {
+	{ .compatible =3D "tianma,tl121bvms07-00",
+	  .data =3D &tm_tl121bvms07_00_desc
+	},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, tm_of_match);
+
+static struct mipi_dsi_driver tm_panel_driver =3D {
+	.driver =3D {
+		.name =3D "panel-tianma-tl121bvms07-00",
+		.of_match_table =3D tm_of_match,
+	},
+	.probe =3D tm_panel_probe,
+	.remove =3D tm_panel_remove,
+	.shutdown =3D tm_panel_shutdown,
+};
+module_mipi_dsi_driver(tm_panel_driver);
+
+MODULE_AUTHOR("Langyan Ye <yelangyan@huaqin.corp-partner.google.com>");
+MODULE_DESCRIPTION("TM tl121bvms07-00 1600x2560 video mode panel driver");
+MODULE_LICENSE("GPL");
--=20
2.34.1