START_DMA
# define START_DMA_TX (START_DMA | 0x0)) /* busmaster-only */
# define START_DMA_RX (START_DMA | 0x1) /* busmaster-only */
_MASKED_BIT_ENABLE(dma_flags | START_DMA));
ret = intel_wait_for_register_fw(uncore, DMA_CTRL, START_DMA, 0, 100, NULL);
if (GFX_MODE_BIT_SET_IN_MASK(mode, START_DMA)) {