ravb: Add half_duplex to struct ravb_hw_info

RZ/G2L supports half duplex mode.
Add a half_duplex hw feature bit to struct ravb_hw_info for
supporting half duplex mode for RZ/G2L.
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/renesas/ravb.h

@@ -1008,6 +1008,7 @@ struct ravb_hw_info {
 	unsigned ccc_gac:1;		/* AVB-DMAC has gPTP support active in config mode */
 	unsigned nc_queue:1;		/* AVB-DMAC has NC queue */
 	unsigned magic_pkt:1;		/* E-MAC supports magic packet detection */
+	unsigned half_duplex:1;		/* E-MAC supports half duplex mode */
 };
 
 struct ravb_private {
@@ -1062,6 +1063,8 @@ struct ravb_private {
 	unsigned rgmii_override:1;	/* Deprecated rgmii-*id behavior */
 	unsigned int num_tx_desc;	/* TX descriptors per packet */
 
+	int duplex;
+
 	const struct ravb_hw_info *info;
 	struct reset_control *rstc;
 };

drivers/net/ethernet/renesas/ravb_main.c

@@ -1091,6 +1091,13 @@ static int ravb_poll(struct napi_struct *napi, int budget)
 	return budget - quota;
 }
 
+static void ravb_set_duplex_gbeth(struct net_device *ndev)
+{
+	struct ravb_private *priv = netdev_priv(ndev);
+
+	ravb_modify(ndev, ECMR, ECMR_DM, priv->duplex > 0 ? ECMR_DM : 0);
+}
+
 /* PHY state control function */
 static void ravb_adjust_link(struct net_device *ndev)
 {
@@ -1107,6 +1114,12 @@ static void ravb_adjust_link(struct net_device *ndev)
 		ravb_rcv_snd_disable(ndev);
 
 	if (phydev->link) {
+		if (info->half_duplex && phydev->duplex != priv->duplex) {
+			new_state = true;
+			priv->duplex = phydev->duplex;
+			ravb_set_duplex_gbeth(ndev);
+		}
+
 		if (phydev->speed != priv->speed) {
 			new_state = true;
 			priv->speed = phydev->speed;
@@ -1121,6 +1134,8 @@ static void ravb_adjust_link(struct net_device *ndev)
 		new_state = true;
 		priv->link = 0;
 		priv->speed = 0;
+		if (info->half_duplex)
+			priv->duplex = -1;
 	}
 
 	/* Enable TX and RX right over here, if E-MAC change is ignored */
@@ -1143,6 +1158,7 @@ static int ravb_phy_init(struct net_device *ndev)
 {
 	struct device_node *np = ndev->dev.parent->of_node;
 	struct ravb_private *priv = netdev_priv(ndev);
+	const struct ravb_hw_info *info = priv->info;
 	struct phy_device *phydev;
 	struct device_node *pn;
 	phy_interface_t iface;
@@ -1150,6 +1166,7 @@ static int ravb_phy_init(struct net_device *ndev)
 
 	priv->link = 0;
 	priv->speed = 0;
+	priv->duplex = -1;
 
 	/* Try connecting to PHY */
 	pn = of_parse_phandle(np, "phy-handle", 0);
@@ -1188,6 +1205,7 @@ static int ravb_phy_init(struct net_device *ndev)
 		netdev_info(ndev, "limited PHY to 100Mbit/s\n");
 	}
 
+	if (!info->half_duplex) {
 		/* 10BASE, Pause and Asym Pause is not supported */
 		phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_10baseT_Half_BIT);
 		phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_10baseT_Full_BIT);
@@ -1197,6 +1215,7 @@ static int ravb_phy_init(struct net_device *ndev)
 		/* Half Duplex is not supported */
 		phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_1000baseT_Half_BIT);
 		phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_100baseT_Half_BIT);
+	}
 
 	phy_attached_info(phydev);
 
@@ -2175,6 +2194,7 @@ static const struct ravb_hw_info gbeth_hw_info = {
 	.tsrq = TCCR_TSRQ0,
 	.aligned_tx = 1,
 	.tx_counters = 1,
+	.half_duplex = 1,
 };
 
 static const struct of_device_id ravb_match_table[] = {