sunxi_usbphy_write
sunxi_usbphy_write(sc, phy, PHY_RES45_CAL_EN, 0x1, 1);
sunxi_usbphy_write(sc, phy, PHY_TX_AMPLITUDE_TUNE, 0x14, 5);
sunxi_usbphy_write(sc, phy, PHY_DISCON_TH_SEL, disc_thresh, 2);