MVPP2_TXQ_PREF_BUF_REG
mvpp2_write(sc->sc, MVPP2_TXQ_PREF_BUF_REG,
reg = mvpp2_read(sc->sc, MVPP2_TXQ_PREF_BUF_REG);
mvpp2_write(sc->sc, MVPP2_TXQ_PREF_BUF_REG, reg);
mvpp2_write(sc->sc, MVPP2_TXQ_PREF_BUF_REG, reg);