drm/i915: Add FIXME for bdw semaphore detection in hancheck
Currently not an issue since we don't emit sempahores, but better
not forget about those.
As a little prep work extract the ipehr decoding for cleaner control
flow. And apply a bit of polish.
Cc: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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