TX_DMA_DESC_REG
AQ_WRITE_REG_BIT(sc, TX_DMA_DESC_REG(ringidx), TX_DMA_DESC_EN, 0);
AQ_WRITE_REG_BIT(sc, TX_DMA_DESC_REG(ringidx), TX_DMA_DESC_LEN,
AQ_WRITE_REG_BIT(sc, TX_DMA_DESC_REG(ringidx),