PIPE_VBLANK_INTERRUPT_STATUS
if (pipe_stats[pipe] & PIPE_VBLANK_INTERRUPT_STATUS)
if (pipe_stats[pipe] & PIPE_VBLANK_INTERRUPT_STATUS)
i915_enable_pipestat(dev_priv, pipe, PIPE_VBLANK_INTERRUPT_STATUS);
i915_disable_pipestat(dev_priv, pipe, PIPE_VBLANK_INTERRUPT_STATUS);