drm/gud: Add GUD_PIXEL_FORMAT_RGB888

Add support for the RGB888 pixel format.
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210929191201.34456-7-noralf@tronnes.org

drivers/gpu/drm/gud/gud_drv.c

@@ -528,6 +528,8 @@ static int gud_probe(struct usb_interface *intf, const struct usb_device_id *id)
 		case GUD_DRM_FORMAT_XRGB1111:
 			fallthrough;
 		case DRM_FORMAT_RGB332:
+			fallthrough;
+		case DRM_FORMAT_RGB888:
 			if (!xrgb8888_emulation_format)
 				xrgb8888_emulation_format = info;
 			break;

drivers/gpu/drm/gud/gud_internal.h

@@ -88,6 +88,8 @@ static inline u8 gud_from_fourcc(u32 fourcc)
 		return GUD_PIXEL_FORMAT_RGB332;
 	case DRM_FORMAT_RGB565:
 		return GUD_PIXEL_FORMAT_RGB565;
+	case DRM_FORMAT_RGB888:
+		return GUD_PIXEL_FORMAT_RGB888;
 	case DRM_FORMAT_XRGB8888:
 		return GUD_PIXEL_FORMAT_XRGB8888;
 	case DRM_FORMAT_ARGB8888:
@@ -110,6 +112,8 @@ static inline u32 gud_to_fourcc(u8 format)
 		return DRM_FORMAT_RGB332;
 	case GUD_PIXEL_FORMAT_RGB565:
 		return DRM_FORMAT_RGB565;
+	case GUD_PIXEL_FORMAT_RGB888:
+		return DRM_FORMAT_RGB888;
 	case GUD_PIXEL_FORMAT_XRGB8888:
 		return DRM_FORMAT_XRGB8888;
 	case GUD_PIXEL_FORMAT_ARGB8888:

drivers/gpu/drm/gud/gud_pipe.c

@@ -195,6 +195,8 @@ static int gud_prep_flush(struct gud_device *gdrm, struct drm_framebuffer *fb,
 			drm_fb_xrgb8888_to_rgb332(buf, vaddr, fb, rect);
 		} else if (format->format == DRM_FORMAT_RGB565) {
 			drm_fb_xrgb8888_to_rgb565(buf, vaddr, fb, rect, gud_is_big_endian());
+		} else if (format->format == DRM_FORMAT_RGB888) {
+			drm_fb_xrgb8888_to_rgb888(buf, vaddr, fb, rect);
 		} else {
 			len = gud_xrgb8888_to_color(buf, format, vaddr, fb, rect);
 		}

include/drm/gud.h

@@ -251,6 +251,7 @@ struct gud_state_req {
   #define GUD_PIXEL_FORMAT_XRGB1111		0x20
   #define GUD_PIXEL_FORMAT_RGB332		0x30
   #define GUD_PIXEL_FORMAT_RGB565		0x40
+  #define GUD_PIXEL_FORMAT_RGB888		0x50
   #define GUD_PIXEL_FORMAT_XRGB8888		0x80
   #define GUD_PIXEL_FORMAT_ARGB8888		0x81