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[Why] Some scalers do not pick up color space updates unless the DP link is disabled/re-enabled which can result in incorrect/washed out HDR colors in some cases. [How] Call set_dpms_on to disable the link, re-train and re-enable with the updated output color space. Reviewed-by: Aric Cyr <Aric.Cyr@amd.com> Acked-by: Alan Liu <HaoPing.Liu@amd.com> Signed-off-by: Ilya Bakoulin <Ilya.Bakoulin@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>