diff --git a/drivers/gpu/drm/nouveau/nv50_vram.c b/drivers/gpu/drm/nouveau/nv50_vram.c
index 6e75335..47489ed 100644
--- a/drivers/gpu/drm/nouveau/nv50_vram.c
+++ b/drivers/gpu/drm/nouveau/nv50_vram.c
@@ -37,6 +37,16 @@
 	1, 0, 2, 0, 1, 0, 2, 0, 1, 1, 2, 2, 1, 1, 0, 0
 };
 
+bool
+nv50_vram_flags_valid(struct drm_device *dev, u32 tile_flags)
+{
+	int type = (tile_flags & NOUVEAU_GEM_TILE_LAYOUT_MASK) >> 8;
+
+	if (likely(type < sizeof(types) && types[type]))
+		return true;
+	return false;
+}
+
 void
 nv50_vram_del(struct drm_device *dev, struct nouveau_vram **pvram)
 {