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net: sh_eth: do not advertise Gigabit capabilities when not available 

Not all variants of the sh_eth hardware have Gigabit
support. Unfortunately, the current driver doesn't tell the PHY about
the limited MAC capabilities. Due to this, if you have a Gigabit
capable PHY, the PHY will advertise its Gigabit capability and
establish a link at 1Gbit/s, even though the MAC doesn't support it.

In order to avoid this, we use the recently introduced
phy_set_max_speed() to tell the PHY to not advertise speed higher than
100 MBit/s.

Tested on a SH7786 platform, with a Gigabit PHY.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Petazzoni 2017-12-08 16:35:40 +01:00 committed by David S. Miller
parent f1e2400a80
commit 2aab6b40b0
1 changed files with 10 additions and 0 deletions
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10
drivers/net/ethernet/renesas/sh_eth.c
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@ -1892,6 +1892,16 @@ static int sh_eth_phy_init(struct net_device *ndev)
return PTR_ERR(phydev);
}
/* mask with MAC supported features */
if (mdp->cd->register_type != SH_ETH_REG_GIGABIT) {
int err = phy_set_max_speed(phydev, SPEED_100);
if (err) {
netdev_err(ndev, "failed to limit PHY to 100 Mbit/s\n");
phy_disconnect(phydev);
return err;
}
}
phy_attached_info(phydev);
return 0;