drm/amd/display: Add function to set dither option

Signed-off-by: Ding Wang <Ding.Wang@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index dd8902d..87675f0 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -122,6 +122,9 @@ struct dc_stream_funcs {
 			const struct dc_stream **stream,
 			int num_streams,
 			const struct dc_static_screen_events *events);
+
+	void (*set_dither_option)(const struct dc_stream *stream,
+			enum dc_dither_option option);
 };
 
 struct link_training_settings;