drm/panel: st7701: Add missing bus_flags configuration for HyperPixel 2.1 Round

When porting the code for the Pimoroni HyperPixel 2.1 Round
from Linux 6.6 to Linux 6.12, the bus_flags configuration was overlooked.
Porting bus_flags resolves the noise issues that were occurring.

Signed-off-by: Akira Ouchi <akkiesoft@marokun.net>

Author: Akkiesoft

drivers/gpu/drm/panel/panel-sitronix-st7701.c

@@ -109,6 +109,7 @@ struct st7701_panel_desc {
 	enum mipi_dsi_pixel_format format;
 	u32 mediabus_format;
 	unsigned int panel_sleep_delay;
+	u32 bus_flags;
 
 	/* TFT matrix driver configuration, panel specific. */
 	const u8	pv_gamma[16];	/* Positive voltage gamma control */
@@ -703,6 +704,7 @@ static int st7701_get_modes(struct drm_panel *panel,
 		drm_display_info_set_bus_formats(&connector->display_info,
 						 &st7701->desc->mediabus_format,
 						 1);
+	connector->display_info.bus_flags = 0;
 
 	connector->display_info.width_mm = desc_mode->width_mm;
 	connector->display_info.height_mm = desc_mode->height_mm;
@@ -713,6 +715,9 @@ static int st7701_get_modes(struct drm_panel *panel,
 	 */
 	drm_connector_set_panel_orientation(connector, st7701->orientation);
 
+	if (st7701->desc->bus_flags)
+		connector->display_info.bus_flags = st7701->desc->bus_flags;
+
 	return 1;
 }
 
@@ -1312,6 +1317,7 @@ static const struct st7701_panel_desc txw210001b0_desc = {
 		CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC255_MASK, 0x1d)
 	},
 	.gip_sequence = txw210001b0_gip_sequence,
+	.bus_flags = DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE,
 };
 
 static const struct st7701_panel_desc hyperpixel2r_desc = {
@@ -1376,6 +1382,7 @@ static const struct st7701_panel_desc hyperpixel2r_desc = {
 		CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC255_MASK, 0x1d)
 	},
 	.gip_sequence = txw210001b0_gip_sequence,
+	.bus_flags = DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE,
 };
 
 static void st7701_cleanup(void *data)