drm/i915: Add support for GPU reset on gen6.
This has proven sufficient to recover from a hang of the GPU using the gem_bad_blit test while at the KMS console then starting X. When attempting the same during an X session, the timer doesn't appear to trigger. Signed-off-by: NEric Anholt <eric@anholt.net> Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
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