net: stmmac: Support WOL with phy

Currently, the stmmac driver WOL implementation relies on MAC's PMT
feature. We have a case: the MAC HW doesn't enable PMT, instead, we
rely on the phy to support WOL. Implement the support for this case.
Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c

@@ -600,6 +600,9 @@ static void stmmac_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
 {
 	struct stmmac_priv *priv = netdev_priv(dev);
 
+	if (!priv->plat->pmt)
+		return phylink_ethtool_get_wol(priv->phylink, wol);
+
 	mutex_lock(&priv->lock);
 	if (device_can_wakeup(priv->device)) {
 		wol->supported = WAKE_MAGIC | WAKE_UCAST;
@@ -618,6 +621,14 @@ static int stmmac_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
 	if (!device_can_wakeup(priv->device))
 		return -EOPNOTSUPP;
 
+	if (!priv->plat->pmt) {
+		int ret = phylink_ethtool_set_wol(priv->phylink, wol);
+
+		if (!ret)
+			device_set_wakeup_enable(&dev->dev, !!wol->wolopts);
+		return ret;
+	}
+
 	/* By default almost all GMAC devices support the WoL via
 	 * magic frame but we can disable it if the HW capability
 	 * register shows no support for pmt_magic_frame. */

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -1075,6 +1075,7 @@ static void stmmac_check_pcs_mode(struct stmmac_priv *priv)
  */
 static int stmmac_init_phy(struct net_device *dev)
 {
+	struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL };
 	struct stmmac_priv *priv = netdev_priv(dev);
 	struct device_node *node;
 	int ret;
@@ -1100,6 +1101,9 @@ static int stmmac_init_phy(struct net_device *dev)
 		ret = phylink_connect_phy(priv->phylink, phydev);
 	}
 
+	phylink_ethtool_get_wol(priv->phylink, &wol);
+	device_set_wakeup_capable(priv->device, !!wol.supported);
+
 	return ret;
 }