drm/i915: always disable irqs in intel_pipe_update_start
This can only fail because of a bug in the code. Suggested-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com> [danvet: Squash in follow-up to also remove start_vbl_count from intel_crtc->atomic and put it into the intel_crtc directly - it's not precomputed state.] Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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