drm/amd/display: enable EASF support for DCN40
[Why] Enable adaptive scaler support for DCN401 [How] - Enable build flag for SPL - Set prefer_easf flag to true - Apply light linear scaling policy based on transfer function and pixel format. Choose between linear or non-linear scaling - Set matrix_mode based on pixel format - Disable ring estimator - Add missing EASF register defines, masks, and writes - Disable EASF if scale ratio or number of taps is unsupported and when bypassing the scaler - Add debug flags and registry keys for debugging SPL and EASF - Add support for Visual Confirm with EASF Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com> Signed-off-by: Samson Tam <Samson.Tam@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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