AG71XX_REG_RX_DESC
ag71xx_wr(ag, AG71XX_REG_RX_DESC, ag->rx_ring.descs_dma);
ag71xx_wr(ag, AG71XX_REG_RX_DESC, ag->stop_desc_dma);
rx_ds = ag71xx_rr(ag, AG71XX_REG_RX_DESC);
ag71xx_wr(ag, AG71XX_REG_RX_DESC, rx_ds);