DSS_IRQ_PLANE_FIFO_UNDERFLOW
vid_stat |= DSS_IRQ_PLANE_FIFO_UNDERFLOW(hw_plane);
if (vidstat & DSS_IRQ_PLANE_FIFO_UNDERFLOW(hw_plane))
tidss->irq_mask |= DSS_IRQ_PLANE_FIFO_UNDERFLOW(tplane->hw_plane_id);
if (irqstatus & DSS_IRQ_PLANE_FIFO_UNDERFLOW(tplane->hw_plane_id))