drm/panel: samsung-s6e88a0-ams427ap24: Add flip option

The way of implementing a flip option follows the existing
panel-samsung-s6e8aa0.c [1][2][3].

The value to flip the screen is taken from a downstream kernel panel
file of a simular but older device. The downstream code is rather
confusing. The mipi clock [4] for the panel is 461 MHz and a hardware
read-out of the 0xcb values corresponds to revision R01 [5], although
in non-flipped state. Further up there is a hint [6] basically saying
for revision R01 to change the first word of the 0xcb command from 0x06
to 0x0e, which is actually setting BIT(3) of that word. This causes a
horizontal flip.

- [1] https://github.com/torvalds/linux/blob/v6.11/drivers/gpu/drm/panel/panel-samsung-s6e8aa0.c#L103
- [2] https://github.com/torvalds/linux/blob/v6.11/drivers/gpu/drm/panel/panel-samsung-s6e8aa0.c#L207-L211
- [3] https://github.com/torvalds/linux/blob/v6.11/drivers/gpu/drm/panel/panel-samsung-s6e8aa0.c#L954-L974
- [4] https://github.com/LineageOS/android_kernel_samsung_msm8930-common/blob/lineage-15.1/drivers/video/msm/mipi_samsung_oled_video_qhd_pt-8930.c#L2027-L2028
- [5] https://github.com/LineageOS/android_kernel_samsung_msm8930-common/blob/lineage-15.1/drivers/video/msm/mipi_samsung_oled_video_qhd_pt-8930.c#L137-L151
- [6] https://github.com/LineageOS/android_kernel_samsung_msm8930-common/blob/lineage-15.1/drivers/video/msm/mipi_samsung_oled_video_qhd_pt-8930.c#L66-L74

Signed-off-by: Jakob Hauser <[email protected]>

Author: Jakko3

drivers/gpu/drm/panel/msm8916-generated/panel-samsung-s6e88a0-ams427ap24.c

@@ -30,6 +30,7 @@ struct s6e88a0_ams427ap24 {
 	struct mipi_dsi_device *dsi;
 	struct regulator_bulk_data supplies[2];
 	struct gpio_desc *reset_gpio;
+	bool flip_horizontal;
 	bool prepared;
 };
 
@@ -526,6 +527,10 @@ static int s6e88a0_ams427ap24_on(struct s6e88a0_ams427ap24 *ctx)
 	mipi_dsi_dcs_write_seq(dsi, 0xcc, 0x4c);
 	mipi_dsi_dcs_write_seq(dsi, 0xf2, 0x03, 0x0d);
 	mipi_dsi_dcs_write_seq(dsi, 0xf1, 0xa5, 0xa5);
+
+	if (ctx->flip_horizontal)
+		mipi_dsi_dcs_write_seq(dsi, 0xcb, 0x0e);
+
 	mipi_dsi_dcs_write_seq(dsi, 0xf0, 0xa5, 0xa5);
 	mipi_dsi_dcs_write_seq(dsi, 0xfc, 0xa5, 0xa5);
 
@@ -682,6 +687,15 @@ static int s6e88a0_ams427ap24_register_backlight(struct s6e88a0_ams427ap24 *ctx)
 	return ret;
 }
 
+static void s6e88a0_ams427ap24_parse_dt(struct s6e88a0_ams427ap24 *ctx)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	struct device *dev = &dsi->dev;
+	struct device_node *np = dev->of_node;
+
+	ctx->flip_horizontal = of_property_read_bool(np, "flip-horizontal");
+}
+
 static int s6e88a0_ams427ap24_probe(struct mipi_dsi_device *dsi)
 {
 	struct device *dev = &dsi->dev;
@@ -716,6 +730,8 @@ static int s6e88a0_ams427ap24_probe(struct mipi_dsi_device *dsi)
 		       DRM_MODE_CONNECTOR_DSI);
 	ctx->panel.prepare_prev_first = true;
 
+	s6e88a0_ams427ap24_parse_dt(ctx);
+
 	ret = s6e88a0_ams427ap24_register_backlight(ctx);
 	if (ret < 0)
 		return ret;