drm/i915: Don't vblank wait on ilk-ivb after pipe enable
Like on hsw/bdw the pipe isn't actually running yet at this point. This holds for both pch ports and the cpu edp port according to my testing on ilk, snb and ivb. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=77297Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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