drm/amd/display: Expose support for xBGR ordered fp16 formats.

Expose support for DRM_FORMAT_ABGR16161616F and
DRM_FORMAT_XBGR16161616F to the DRM core, complementing
the already existing xRGB ordered fp16 formats.

These are especially useful for creating presentable
swapchains in Vulkan for VK_FORMAT_R16G16B16A16_SFLOAT.
Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -3665,6 +3665,10 @@ fill_dc_plane_info_and_addr(struct amdgpu_device *adev,
 	case DRM_FORMAT_ARGB16161616F:
 		plane_info->format = SURFACE_PIXEL_FORMAT_GRPH_ARGB16161616F;
 		break;
+	case DRM_FORMAT_XBGR16161616F:
+	case DRM_FORMAT_ABGR16161616F:
+		plane_info->format = SURFACE_PIXEL_FORMAT_GRPH_ABGR16161616F;
+		break;
 	default:
 		DRM_ERROR(
 			"Unsupported screen format %s\n",
@@ -5580,6 +5584,8 @@ static int get_plane_formats(const struct drm_plane *plane,
 		if (plane_cap && plane_cap->pixel_format_support.fp16) {
 			formats[num_formats++] = DRM_FORMAT_XRGB16161616F;
 			formats[num_formats++] = DRM_FORMAT_ARGB16161616F;
+			formats[num_formats++] = DRM_FORMAT_XBGR16161616F;
+			formats[num_formats++] = DRM_FORMAT_ABGR16161616F;
 		}
 		break;