igt/perf_pmu: Recalibrate interrupt loop.
We have to be careful in our calibration loop, too slow and we timeout, too fast and we don't emit an interrupt! On fast legacy devices, we would overflow the calibration calcuation... v2: Give the time constants a name. Signed-off-by: Chris Wilson <email@example.com> Cc: Tvrtko Ursulin <firstname.lastname@example.org> Reviewed-by: Tvrtko Ursulin <email@example.com>
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