CR_PROTOCOL_READ_REG
writel(SS_CR_READ_REG, phy_dwc3->base + CR_PROTOCOL_READ_REG);
ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_READ_REG);
writel(SS_CR_READ_REG, phy_dwc3->base + CR_PROTOCOL_READ_REG);
ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_READ_REG);