drm: panel: Add support for Hydis HV101HD1 MIPI DSI panel

HV101HD1-1E1 is a color active matrix TFT LCD module using amorphous
silicon TFT's (Thin Film Transistors) as an active switching devices. This
module has a 10.1 inch diagonally measured active area with HD resolutions
(1366 horizontal by 768 vertical pixel array).

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Reviewed-by: David Heidelberg <david@ixit.cz>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20250717135752.55958-3-clamor95@gmail.com

drivers/gpu/drm/panel/Kconfig

@@ -215,6 +215,19 @@ config DRM_PANEL_HIMAX_HX8394
 
 	  If M is selected the module will be called panel-himax-hx8394.
 
+config DRM_PANEL_HYDIS_HV101HD1
+	tristate "Hydis HV101HD1 panel"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
+	help
+	  Say Y here if you want to enable support for the Hydis HV101HD1
+	  2-lane 1366x768 MIPI DSI panel found in ASUS VivoTab RT TF600T.
+	  HV101HD1 is a color active matrix TFT LCD module using amorphous
+	  silicon TFT's (Thin Film Transistors) as an active switching devices.
+
+	  If M is selected the module will be called panel-hydis-hv101hd1
+
 config DRM_PANEL_ILITEK_IL9322
 	tristate "Ilitek ILI9322 320x240 QVGA panels"
 	depends on OF && SPI

drivers/gpu/drm/panel/Makefile

@@ -22,6 +22,7 @@ obj-$(CONFIG_DRM_PANEL_HIMAX_HX83102) += panel-himax-hx83102.o
 obj-$(CONFIG_DRM_PANEL_HIMAX_HX83112A) += panel-himax-hx83112a.o
 obj-$(CONFIG_DRM_PANEL_HIMAX_HX83112B) += panel-himax-hx83112b.o
 obj-$(CONFIG_DRM_PANEL_HIMAX_HX8394) += panel-himax-hx8394.o
+obj-$(CONFIG_DRM_PANEL_HYDIS_HV101HD1) += panel-hydis-hv101hd1.o
 obj-$(CONFIG_DRM_PANEL_ILITEK_IL9322) += panel-ilitek-ili9322.o
 obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9341) += panel-ilitek-ili9341.o
 obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9805) += panel-ilitek-ili9805.o

drivers/gpu/drm/panel/panel-hydis-hv101hd1.c

@@ -0,0 +1,188 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/array_size.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/regulator/consumer.h>
+
+#include <video/mipi_display.h>
+
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+
+struct hv101hd1 {
+	struct drm_panel panel;
+	struct mipi_dsi_device *dsi;
+	struct regulator_bulk_data *supplies;
+};
+
+static const struct regulator_bulk_data hv101hd1_supplies[] = {
+	{ .supply = "vdd" },
+	{ .supply = "vio" },
+};
+
+static inline struct hv101hd1 *to_hv101hd1(struct drm_panel *panel)
+{
+	return container_of(panel, struct hv101hd1, panel);
+}
+
+static int hv101hd1_prepare(struct drm_panel *panel)
+{
+	struct hv101hd1 *hv = to_hv101hd1(panel);
+	struct mipi_dsi_multi_context ctx = { .dsi = hv->dsi };
+	struct device *dev = &hv->dsi->dev;
+	int ret;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(hv101hd1_supplies), hv->supplies);
+	if (ret) {
+		dev_err(dev, "error enabling regulators (%d)\n", ret);
+		return ret;
+	}
+
+	mipi_dsi_dcs_exit_sleep_mode_multi(&ctx);
+	mipi_dsi_msleep(&ctx, 20);
+
+	mipi_dsi_dcs_set_display_on_multi(&ctx);
+	mipi_dsi_msleep(&ctx, 20);
+
+	return 0;
+}
+
+static int hv101hd1_disable(struct drm_panel *panel)
+{
+	struct hv101hd1 *hv = to_hv101hd1(panel);
+	struct mipi_dsi_multi_context ctx = { .dsi = hv->dsi };
+
+	mipi_dsi_dcs_set_display_off_multi(&ctx);
+	mipi_dsi_msleep(&ctx, 120);
+	mipi_dsi_dcs_enter_sleep_mode_multi(&ctx);
+	mipi_dsi_msleep(&ctx, 20);
+
+	return 0;
+}
+
+static int hv101hd1_unprepare(struct drm_panel *panel)
+{
+	struct hv101hd1 *hv = to_hv101hd1(panel);
+
+	return regulator_bulk_disable(ARRAY_SIZE(hv101hd1_supplies),
+				      hv->supplies);
+}
+
+static const struct drm_display_mode hv101hd1_mode = {
+	.clock = (1366 + 74 + 36 + 24) * (768 + 21 + 7 + 4) * 60 / 1000,
+	.hdisplay = 1366,
+	.hsync_start = 1366 + 74,
+	.hsync_end = 1366 + 74 + 36,
+	.htotal = 1366 + 74 + 36 + 24,
+	.vdisplay = 768,
+	.vsync_start = 768 + 21,
+	.vsync_end = 768 + 21 + 7,
+	.vtotal = 768 + 21 + 7 + 4,
+	.width_mm = 140,
+	.height_mm = 220,
+};
+
+static int hv101hd1_get_modes(struct drm_panel *panel, struct drm_connector *connector)
+{
+	struct drm_display_mode *mode;
+
+	mode = drm_mode_duplicate(connector->dev, &hv101hd1_mode);
+	if (!mode)
+		return -ENOMEM;
+
+	drm_mode_set_name(mode);
+
+	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+
+	connector->display_info.width_mm = mode->width_mm;
+	connector->display_info.height_mm = mode->height_mm;
+
+	drm_mode_probed_add(connector, mode);
+
+	return 1;
+}
+
+static const struct drm_panel_funcs hv101hd1_panel_funcs = {
+	.prepare = hv101hd1_prepare,
+	.disable = hv101hd1_disable,
+	.unprepare = hv101hd1_unprepare,
+	.get_modes = hv101hd1_get_modes,
+};
+
+static int hv101hd1_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	struct hv101hd1 *hv;
+	int ret;
+
+	hv = devm_drm_panel_alloc(dev, struct hv101hd1, panel,
+				  &hv101hd1_panel_funcs,
+				  DRM_MODE_CONNECTOR_DSI);
+	if (IS_ERR(hv))
+		return PTR_ERR(hv);
+
+	ret = devm_regulator_bulk_get_const(dev, ARRAY_SIZE(hv101hd1_supplies),
+					    hv101hd1_supplies, &hv->supplies);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to get regulators\n");
+
+	hv->dsi = dsi;
+	mipi_dsi_set_drvdata(dsi, hv);
+
+	dsi->lanes = 2;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_LPM;
+
+	ret = drm_panel_of_backlight(&hv->panel);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to get backlight\n");
+
+	drm_panel_add(&hv->panel);
+
+	ret = mipi_dsi_attach(dsi);
+	if (ret) {
+		drm_panel_remove(&hv->panel);
+		return dev_err_probe(dev, ret, "Failed to attach to DSI host\n");
+	}
+
+	return 0;
+}
+
+static void hv101hd1_remove(struct mipi_dsi_device *dsi)
+{
+	struct hv101hd1 *hv = 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(&hv->panel);
+}
+
+static const struct of_device_id hv101hd1_of_match[] = {
+	{ .compatible = "hydis,hv101hd1" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, hv101hd1_of_match);
+
+static struct mipi_dsi_driver hv101hd1_driver = {
+	.driver = {
+		.name = "panel-hv101hd1",
+		.of_match_table = hv101hd1_of_match,
+	},
+	.probe = hv101hd1_probe,
+	.remove = hv101hd1_remove,
+};
+module_mipi_dsi_driver(hv101hd1_driver);
+
+MODULE_AUTHOR("Svyatoslav Ryhel <clamor95@gmail.com>");
+MODULE_DESCRIPTION("DRM driver for Hydis HV101HD1 panel");
+MODULE_LICENSE("GPL");