GEN8_PIPE_FIFO_UNDERRUN
if (iir & GEN8_PIPE_FIFO_UNDERRUN)
u32 extra_ier = GEN8_PIPE_VBLANK | GEN8_PIPE_FIFO_UNDERRUN |
GEN8_PIPE_VBLANK | GEN8_PIPE_FIFO_UNDERRUN |
bdw_enable_pipe_irq(display, pipe, GEN8_PIPE_FIFO_UNDERRUN);
bdw_disable_pipe_irq(display, pipe, GEN8_PIPE_FIFO_UNDERRUN);