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[Why] When doing 2:1 downscaling on a YUV sub-sampled format, the chroma scaling ratio is 1:1. Since chroma has cositing, it is needed to do scaling on the chroma plane(s) and not to bypass chroma scaling. [How] Do not set the chroma taps to one when the chroma ratio is identity and the input format is a sub-sampled YUV format. Reviewed-by: Samson Tam <samson.tam@amd.com> Signed-off-by: Navid Assadian <Navid.Assadian@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>