drm/i915: set the right gen3 flip_done mode also at resume
Currently we've only frobbed this bit at irq_init time, but did not restore it at resume time. Move it to the gen3 clock gating function to fix this. Notice while reading through code. Cc: stable@vger.kernel.org (for 3.5 only) Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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