MVPP2_GMAC_CTRL_0_REG
reg = mvpp2_gmac_read(sc, MVPP2_GMAC_CTRL_0_REG);
mvpp2_gmac_write(sc, MVPP2_GMAC_CTRL_0_REG, reg);
val = mvpp2_gmac_read(port, MVPP2_GMAC_CTRL_0_REG);
mvpp2_gmac_write(port, MVPP2_GMAC_CTRL_0_REG, val);
val = mvpp2_gmac_read(port, MVPP2_GMAC_CTRL_0_REG);
mvpp2_gmac_write(port, MVPP2_GMAC_CTRL_0_REG, val);