drm/i915: use runtime irq suspend/resume in freeze/thaw
We don't need to uninstall the full handler, simply disabling interrupts ought to be enough. Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> Reviewed-by: Imre Deak <imre.deak@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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