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[Why] Panels show corruption with high refresh rate timings when ssc is enabled. [How] Read down-spread percentage from lut to adjust dprefclk. Issues come from S0i3 with this commit has been fixed by SMU. Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> Acked-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com> Signed-off-by: Martin Tsai <martin.tsai@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>