AG71XX_REG_RX_CTRL
ag71xx_wr(ag, AG71XX_REG_RX_CTRL, RX_CTRL_RXE);
ag71xx_wr(ag, AG71XX_REG_RX_CTRL, 0);
rx = ag71xx_rr(ag, AG71XX_REG_RX_CTRL) & RX_CTRL_RXE;
ag71xx_wr(ag, AG71XX_REG_RX_CTRL, 0);
ag71xx_wr(ag, AG71XX_REG_RX_CTRL, RX_CTRL_RXE);