diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index 5eeb32c9c9ce..c9bc4ccb6d43 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -624,7 +624,8 @@ static inline void ltdc_set_ycbcr_config(struct drm_plane *plane, u32 drm_pix_fm
 		break;
 	default:
 		/* RGB or not a YCbCr supported format */
-		break;
+		DRM_ERROR("Unsupported pixel format: %u\n", drm_pix_fmt);
+		return;
 	}
 
 	/* Enable limited range */