drm/amd/display: Clear update flags at end of flip

Clear update flags so the next flip does not have any redundant
programming (if a subsequent flip does not have a stream or plane
update, the update flags are not cleared).

Fixes: 0baae624 ("drm/amd/display: Refactor fast update to use new HWSS build sequence")
Reviewed-by: Jun Lei <jun.lei@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Alvin Lee <alvin.lee2@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc.c

@@ -3577,6 +3577,13 @@ static void commit_planes_for_stream_fast(struct dc *dc,
 	hwss_execute_sequence(dc,
 			context->block_sequence,
 			context->block_sequence_steps);
+	/* Clear update flags so next flip doesn't have redundant programming
+	 * (if there's no stream update, the update flags are not cleared).
+	 */
+	if (top_pipe_to_program->plane_state)
+		top_pipe_to_program->plane_state->update_flags.raw = 0;
+	if (top_pipe_to_program->stream)
+		top_pipe_to_program->stream->update_flags.raw = 0;
 }
 
 static void commit_planes_for_stream(struct dc *dc,