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[Why] Currently only a singular de-rate is used for all DPM levels. The intent was to limit the bandwidth utilization at high DPMs so the display requirements are not competing with other engines for bandwidth. At lower DPMs, the de-rates could be more lenient so more bandwidth can be utilized without the need to increase the DPM level and result in potential power savings. i.e. DPM0 could be achieved on certain display configs instead of DPM1 if de-rates were a couple percentage points higher The system average de-rates can be adjusted as needed as only urgent de-rates are defined for the SOC. [How] Update QOS parameters to have a table of derates with a per-DPM granularity If the per-DPM value is provided, that will value be used. Otherwise use the global value if there is no DPM specific value. Reviewed-by: Jun Lei <jun.lei@amd.com> Signed-off-by: Austin Zheng <Austin.Zheng@amd.com> Signed-off-by: George Zhang <george.zhang@amd.com> Tested-by: Dan Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>