net: bcmgenet: Add 'eee' module parameter

On some switches, having EEE enabled causes the link to become
unstable. With this patch, adding 'genet.eee=N' to the kernel command
line will cause EEE to be disabled on the link.

See: #4289

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

drivers/net/ethernet/broadcom/genet/bcmgenet.c

@@ -70,6 +70,9 @@ static void bcmgenet_set_rx_mode(struct net_device *dev);
 static bool skip_umac_reset = false;
 module_param(skip_umac_reset, bool, 0444);
 MODULE_PARM_DESC(skip_umac_reset, "Skip UMAC reset step");
+static bool eee = true;
+module_param(eee, bool, 0444);
+MODULE_PARM_DESC(eee, "Enable EEE (default Y)");
 
 static inline void bcmgenet_writel(u32 value, void __iomem *offset)
 {
@@ -3430,6 +3433,17 @@ static int bcmgenet_open(struct net_device *dev)
 
 	bcmgenet_phy_pause_set(dev, priv->rx_pause, priv->tx_pause);
 
+	if (!eee) {
+		struct ethtool_keee eee_data;
+
+		ret = bcmgenet_get_eee(dev, &eee_data);
+		if (ret == 0) {
+			eee_data.eee_enabled = 0;
+			bcmgenet_set_eee(dev, &eee_data);
+			netdev_warn(dev, "EEE disabled\n");
+		}
+	}
+
 	bcmgenet_netif_start(dev);
 
 	netif_tx_start_all_queues(dev);