drm/i915/vlv: use parallel context restore when coming out of RC6
Setting this bit restores all ring contexts in parallel rather than serially. Matches current BWG recommendations. Tested-by: N"Meng, Mengmeng" <mengmeng.meng@intel.com> Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org> Reviewed-by: NDeepak S <deepak.s@inel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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