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Chris Wilson authored
If our watchdog fires and we see that the GPU is idle, but that we are still waiting on an interrupt, forcibly wake-up the waiter. i915_do_wait_request() should not be racy, yet there are persistent reports that 945GM hangs whilst the GPU is idle. This implies that the hardware is not quite as coherent as the documentation claims - a write followed by a flush is supposed to be coherent in main memory before the flush is retired and the irq is emitted. This seems to be a sensible and elegant guard to force the wait to timeout. v2: Daniel Vetter pointed out that a warning would be useful to explain why the machine appeared to stall. Signed-off-by:
Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by:
Eric Anholt <eric@anholt.net>
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