drm/i915/gen8: Factor out display interrupt handling
Tidy quite long interrupt service routine by factoring out the display part. This simplifies the exit path a little bit, makes the code a bit more readable, and potentialy makes code reuse in the future easier. Signed-off-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/1452614647-13973-2-git-send-email-tvrtko.ursulin@linux.intel.com
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