GMAC_REG_OMR
ret = netsec_mac_read(priv, GMAC_REG_OMR, &value);
if (netsec_mac_write(priv, GMAC_REG_OMR, value))
ret = netsec_mac_read(priv, GMAC_REG_OMR, &value);
return netsec_mac_write(priv, GMAC_REG_OMR, value);