drm/i915/vlv: use PIPE_START_VBLANK interrupts on VLV
This fixes a mismatch between our vblank enable code and our IRQ handler. Also, since vblank start events come in before page flips reliably, it also fixes the kms_flip plain-flip test on my BYT system. Spotted-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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