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[Why] DOUBLE_BUFFER_EN bit is getting cleared before enable blanking. That leads to CRTC_BLANK_DATA_EN is getting updated immediately. [How] Get DOUBLE_BUFFER_EN bit set, the same as DCE110. Signed-off-by: Jerry (Fangzhi) Zuo <Jerry.Zuo@amd.com> Reviewed-by: Charlene Liu <Charlene.Liu@amd.com> Acked-by: Leo Li <sunpeng.li@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>