drm/tegra: Support the XBGR8888 pixelformat

While at it, also include the RGB565 pixelformat in the list of formats
supported by overlays.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Tested-by: Erik Faye-Lund <kusmabite@gmail.com>
diff --git a/drivers/gpu/host1x/drm/dc.c b/drivers/gpu/host1x/drm/dc.c
index 85ea616..1e20603 100644
--- a/drivers/gpu/host1x/drm/dc.c
+++ b/drivers/gpu/host1x/drm/dc.c
@@ -105,7 +105,9 @@
 };
 
 static const uint32_t plane_formats[] = {
+	DRM_FORMAT_XBGR8888,
 	DRM_FORMAT_XRGB8888,
+	DRM_FORMAT_RGB565,
 	DRM_FORMAT_UYVY,
 	DRM_FORMAT_YUV420,
 	DRM_FORMAT_YUV422,
@@ -543,6 +545,9 @@
 unsigned int tegra_dc_format(uint32_t format)
 {
 	switch (format) {
+	case DRM_FORMAT_XBGR8888:
+		return WIN_COLOR_DEPTH_R8G8B8A8;
+
 	case DRM_FORMAT_XRGB8888:
 		return WIN_COLOR_DEPTH_B8G8R8A8;