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[Why] We've made fix for garbage in dcn31_reset_back_end_for_pipe(), adding blank_stream() before disable_crtc(). And set_dpms_off() will call blank_stream() again. [How] Add flag to avoid calling blank_stream() twice. Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> Signed-off-by: Zhongwei Zhang <Zhongwei.Zhang@amd.com> Signed-off-by: Wayne Lin <wayne.lin@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>