MVPP22_GMAC_CTRL_4_REG
old_ctrl4 = ctrl4 = readl(port->base + MVPP22_GMAC_CTRL_4_REG);
writel(ctrl4, port->base + MVPP22_GMAC_CTRL_4_REG);
mvpp2_modify(port->base + MVPP22_GMAC_CTRL_4_REG,