openwrt/target/linux/layerscape/patches-5.4/701-net-0342-LF-376-enetc-disable-EEE-autoneg-by-default.patch

From cb87015e005f429bff6fc084a61281235ca83d51 Mon Sep 17 00:00:00 2001
From: Yangbo Lu <yangbo.lu@nxp.com>
Date: Fri, 6 Dec 2019 12:41:48 +0800
Subject: [PATCH] LF-376 enetc: disable EEE autoneg by default

The EEE support has not been enabled on ENETC, but it may connect
to a PHY which supports EEE and advertises EEE by default, while
its link partner also advertises EEE. If this happens, the PHY enters
low power mode when the traffic rate is low and causes packet loss.
This patch disables EEE advertisement by default for any PHY that
ENETC connects to, to prevent the above unwanted outcome.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
---
 drivers/net/ethernet/freescale/enetc/enetc.c | 5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/net/ethernet/freescale/enetc/enetc.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc.c
@@ -1361,6 +1361,7 @@ static int enetc_phy_connect(struct net_
 {
 	struct enetc_ndev_priv *priv = netdev_priv(ndev);
 	struct phy_device *phydev;
+	struct ethtool_eee edata;
 
 	if (!priv->phy_node)
 		return 0; /* phy-less mode */
@@ -1374,6 +1375,10 @@ static int enetc_phy_connect(struct net_
 
 	phy_attached_info(phydev);
 
+	/* disable EEE autoneg, until ENETC driver supports it */
+	memset(&edata, 0, sizeof(struct ethtool_eee));
+	phy_ethtool_set_eee(phydev, &edata);
+
 	return 0;
 }