freedreno: correct modifier for UBWC buffers

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>

src/gallium/drivers/freedreno/freedreno_resource.c

@@ -681,6 +681,9 @@ fd_resource_modifier(struct fd_resource *rsc)
 	if (!rsc->tile_mode)
 		return DRM_FORMAT_MOD_LINEAR;
 
+	if (rsc->ubwc_size)
+		return DRM_FORMAT_MOD_QCOM_COMPRESSED;
+
 	/* TODO invent a modifier for tiled but not UBWC buffers: */
 	return DRM_FORMAT_MOD_INVALID;
 }