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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Shaohui Xie <Shaohui.Xie@nxp.com>,
        Yangbo Lu <Yangbo.lu@nxp.com>,
        Claudiu Manoil <claudiu.manoil@nxp.com>,
        Andrew Lunn <andrew@lunn.ch>,
        "David S. Miller" <davem@davemloft.net>,
        Sasha Levin <alexander.levin@microsoft.com>
Subject: [PATCH 4.9 071/145] gianfar: Disable EEE autoneg by default
Date:   Fri, 23 Feb 2018 19:26:17 +0100
Message-Id: <20180223170733.867043636@linuxfoundation.org>
In-Reply-To: <20180223170724.669759283@linuxfoundation.org>
References: <20180223170724.669759283@linuxfoundation.org>
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4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Claudiu Manoil <claudiu.manoil@nxp.com>


[ Upstream commit b6b5e8a691185606dfffff3198c89e3b4fd9d4f6 ]

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@nxp.com>
Tested-by: Yangbo Lu <Yangbo.lu@nxp.com>
Signed-off-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/freescale/gianfar.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/net/ethernet/freescale/gianfar.c
+++ b/drivers/net/ethernet/freescale/gianfar.c
@@ -1789,6 +1789,7 @@ static int init_phy(struct net_device *d
 		GFAR_SUPPORTED_GBIT : 0;
 	phy_interface_t interface;
 	struct phy_device *phydev;
+	struct ethtool_eee edata;
 
 	priv->oldlink = 0;
 	priv->oldspeed = 0;
@@ -1813,6 +1814,10 @@ static int init_phy(struct net_device *d
 	/* 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;
 }