drm/gud: Add GUD_PIXEL_FORMAT_RGB332

Add support for the RGB332 pixel format.

Acked-by: Thomas Zimmermann <[e-mail]>
Signed-off-by: Noralf Trønnes <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/gud/gud_drv.c

···
 		case DRM_FORMAT_R8:
 			fallthrough;
 		case GUD_DRM_FORMAT_XRGB1111:
+			fallthrough;
+		case DRM_FORMAT_RGB332:
 			if (!xrgb8888_emulation_format)
 				xrgb8888_emulation_format = info;
 			break;

drivers/gpu/drm/gud/gud_internal.h

···
 		return GUD_PIXEL_FORMAT_R8;
 	case GUD_DRM_FORMAT_XRGB1111:
 		return GUD_PIXEL_FORMAT_XRGB1111;
+	case DRM_FORMAT_RGB332:
+		return GUD_PIXEL_FORMAT_RGB332;
 	case DRM_FORMAT_RGB565:
 		return GUD_PIXEL_FORMAT_RGB565;
 	case DRM_FORMAT_XRGB8888:
···
 		return DRM_FORMAT_R8;
 	case GUD_PIXEL_FORMAT_XRGB1111:
 		return GUD_DRM_FORMAT_XRGB1111;
+	case GUD_PIXEL_FORMAT_RGB332:
+		return DRM_FORMAT_RGB332;
 	case GUD_PIXEL_FORMAT_RGB565:
 		return DRM_FORMAT_RGB565;
 	case GUD_PIXEL_FORMAT_XRGB8888:

drivers/gpu/drm/gud/gud_pipe.c

···
 			}
 		} else if (format->format == DRM_FORMAT_R8) {
 			drm_fb_xrgb8888_to_gray8(buf, vaddr, fb, rect);
+		} else if (format->format == DRM_FORMAT_RGB332) {
+			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 {

include/drm/gud.h

···
   #define GUD_PIXEL_FORMAT_R1			0x01 /* 1-bit monochrome */
   #define GUD_PIXEL_FORMAT_R8			0x08 /* 8-bit greyscale */
   #define GUD_PIXEL_FORMAT_XRGB1111		0x20
+  #define GUD_PIXEL_FORMAT_RGB332		0x30
   #define GUD_PIXEL_FORMAT_RGB565		0x40
   #define GUD_PIXEL_FORMAT_XRGB8888		0x80
   #define GUD_PIXEL_FORMAT_ARGB8888		0x81