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[Why] MST monitor sends link loss short pulse continuous but sink is occupy by HDMI input to lead link training fail. [How] disable link once retraining fail. Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com> Signed-off-by: Yu-ting Shen <yu-tshen@amd.com> Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>