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When we switched to always using a timeout in conjunction with wait_seqno, we lost the ability to detect missed interrupts. Since, we have had issues with interrupts on a number of generations, and they are required to be delivered in a timely fashion for a smooth UX, it is important that we do log errors found in the wild and prevent the display stalling for upwards of 1s every time the seqno interrupt is missed. Rather than continue to fix up the timeouts to work around the interface impedence in wait_event_*(), open code the combination of wait_event[_interruptible][_timeout], and use the exposed timer to poll for seqno should we detect a lost interrupt. v2: In order to satisfy the debug requirement of logging missed interrupts with the real world requirments of making machines work even if interrupts are hosed, we revert to polling after detecting a missed interrupt. v3: Throw in a debugfs interface to simulate broken hw not reporting interrupts. v4: s/EGAIN/EAGAIN/ (Imre) Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Imre Deak <imre.deak@intel.com> [danvet: Don't use the struct typedef in new code.] Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> |
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