[WIP] drm/starfive: Support DRM_FORMAT_XRGB8888

When creating dumb buffers with 32bpp and 24bit colour depth this is
default mode return by drm_mode_legacy_fb_format. So we need to support
this for common dumb buffers to just work.

Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>

Author: esmil

drivers/gpu/drm/starfive/starfive_drm_crtc.c

@@ -64,6 +64,7 @@ static int ddrfmt_to_ppfmt(struct starfive_crtc *sf_crtc)
 	case DRM_FORMAT_NV12:
 		sf_crtc->vpp_format = COLOR_YUV420_NV12;
 		break;
+	case DRM_FORMAT_XRGB8888:
 	case DRM_FORMAT_ARGB8888:
 		sf_crtc->vpp_format = COLOR_RGB888_ARGB;
 		break;

drivers/gpu/drm/starfive/starfive_drm_plane.c

@@ -28,6 +28,7 @@ static const u32 formats[] = {
 	DRM_FORMAT_NV21,
 	DRM_FORMAT_NV12,
 
+	DRM_FORMAT_XRGB8888,
 	DRM_FORMAT_ARGB8888,
 	DRM_FORMAT_ABGR8888,
 };