drm/i915/selftests: Wait for idle between idle resets as well
Even though we weren't injecting guilty requests to be reset, we could still fall over the issue of resetting the same request too fast -- where the GPU refuses to start again. (Although it is interesting to note that reloading the driver is sufficient, suggesting that we could recover if we delayed the setup after reset?) Continue to paper over the problem by adding a small delay by waiting for the engine to idle between tests, and ensure that the engines are idle before starting the idle tests. v2: Replace single instance of 50 with a magic macro. References: 02866679 ("drm/i915/selftests: Avoid repeatedly harming the same innocent context") Signed-off-by:Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Cc: Michał Winiarski <michal.winiarski@intel.com> Cc: Michel Thierry <michel.thierry@intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by:
Michał Winiarski <michal.winiarski@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180411120346.27618-1-chris@chris-wilson.co.uk
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