drm/i915/selftests: Verify frequency scaling with RPS
One of the core tenents of reclocking the GPU is that its throughput scales with the clock frequency. We can observe this by incrementing a loop counter on the GPU, and compare the different execution rates at the notional RPS frequencies. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200420172739.11620-1-chris@chris-wilson.co.uk
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