netdev - [PATCH net] gianfar: Disable EEE autoneg by default

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Date:   Thu, 7 Dec 2017 18:44:23 +0200
From:   Claudiu Manoil <claudiu.manoil@....com>
To:     <netdev@...r.kernel.org>
CC:     Andrew Lunn <andrew@...n.ch>,
        "David S . Miller" <davem@...emloft.net>,
        Shaohui Xie <Shaohui.Xie@....com>
Subject: [PATCH net] gianfar: Disable EEE autoneg by default

This controller does not support EEE, 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
gianfar connects to, to prevent the above unwanted outcome.

Signed-off-by: Shaohui Xie <Shaohui.Xie@....com>
Tested-by: Yangbo Lu <Yangbo.lu@....com>
Signed-off-by: Claudiu Manoil <claudiu.manoil@....com>
---
 drivers/net/ethernet/freescale/gianfar.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
index 81a73af..7f83700 100644
--- a/drivers/net/ethernet/freescale/gianfar.c
+++ b/drivers/net/ethernet/freescale/gianfar.c
@@ -1792,6 +1792,7 @@ static int init_phy(struct net_device *dev)
 		GFAR_SUPPORTED_GBIT : 0;
 	phy_interface_t interface;
 	struct phy_device *phydev;
+	struct ethtool_eee edata;
 
 	priv->oldlink = 0;
 	priv->oldspeed = 0;
@@ -1816,6 +1817,10 @@ static int init_phy(struct net_device *dev)
 	/* Add support for flow control, but don't advertise it by default */
 	phydev->supported |= (SUPPORTED_Pause | SUPPORTED_Asym_Pause);
 
+	/* disable EEE autoneg, EEE not supported by eTSEC */
+	memset(&edata, 0, sizeof(struct ethtool_eee));
+	phy_ethtool_set_eee(phydev, &edata);
+
 	return 0;
 }
 
-- 
2.7.4