Q_WRITE
Q_WRITE(q, desc_base, q->desc_dma);
Q_WRITE(q, ring_size, MT_DMA_RRO_EN | q->ndesc);
Q_WRITE(q, ring_size, q->ndesc);
Q_WRITE(q, cpu_idx, 0);
Q_WRITE(q, dma_idx, 0);
Q_WRITE(q, cpu_idx, q->head);
Q_WRITE(q, dma_idx, q->tail);