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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@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>
This commit is contained in:
Claudiu Manoil 2017-12-07 18:44:23 +02:00 committed by David S. Miller
parent d4761754b4
commit b6b5e8a691
1 changed files with 5 additions and 0 deletions
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5
drivers/net/ethernet/freescale/gianfar.c
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@ -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;
}