drm/i915/selftests: Disable heartbeat around context barrier tests
As the heartbeat has the effect of flushing context barriers, this interferes with the context barrier tests that are trying to observe them directly. Disable the heartbeat so that the barriers are as predictable as the test demands. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191115150841.880349-2-chris@chris-wilson.co.uk
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