REG_MSR
val8 = rtl8xxxu_read8(priv, REG_MSR) & 0x0c;
val8 = rtl8xxxu_read8(priv, REG_MSR) & 0x03;
rtl8xxxu_write8(priv, REG_MSR, val8);
msr = rtl8xxxu_read8(priv, REG_MSR);
rtl8xxxu_write8(priv, REG_MSR, msr);