[PATCH 4/4] drm/amdgpu: extend profiling mode.

[Andy Furniss]

Rex Zhu wrote:
> in profiling mode, powerplay will fix power state
> as stable as possible.and disable gfx cg and LBPW feature.
>
> profile_standard: as a prerequisite, ensure power and thermal
> sustainable, set clocks ratio as close to the highest clock
> ratio as possible.
> profile_min_sclk: fix mclk as profile_normal, set lowest sclk
> profile_min_mclk: fix sclk as profile_normal, set lowest mclk
> profile_peak: set highest sclk and mclk, power and thermal not
> sustainable
> profile_exit: exit profile mode. enable gfx cg/lbpw feature.

Testing R9 285 Tonga on drm-next-4.11-wip

This commit has the effect that doing

echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level

instantly forces fan to (I guess) max, where normally it doesn't
need anything like as fast with the clocks high when doing nothing else.