STMMAC_FLAG_KEEP_PREAMBLE_BEFORE_SFD
if (data->flags & STMMAC_FLAG_KEEP_PREAMBLE_BEFORE_SFD)
plat_dat->flags |= STMMAC_FLAG_KEEP_PREAMBLE_BEFORE_SFD;
STMMAC_FLAG_KEEP_PREAMBLE_BEFORE_SFD,
if (priv->plat->flags & STMMAC_FLAG_KEEP_PREAMBLE_BEFORE_SFD)