mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-30 14:19:16 +00:00
Code Issues Releases Wiki Activity

net: mvneta: speed down the PHY, if WoL used, to save energy

Browse source 
Some PHYs connected to this ethernet hardware support the WoL feature.
But when WoL is enabled and the machine is powered off, the PHY remains
waiting for a magic packet at max speed (i.e. 1Gbps), which is a waste of
energy.

Slow down the PHY speed before stopping the ethernet if WoL is enabled,
and save some energy while the machine is powered off or sleeping.

Tested using an Armada 370 based board (LS421DE) equipped with a Marvell
88E1518 PHY.

Signed-off-by: Daniel González Cabanelas <dgcbueu@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel González Cabanelas 2020-05-12 19:59:48 +02:00 committed by David S. Miller
parent 6545be8280
commit 5e3768a436
1 changed files with 11 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
drivers/net/ethernet/marvell/mvneta.c
View file

@ -3561,6 +3561,10 @@ static void mvneta_start_dev(struct mvneta_port *pp)
MVNETA_CAUSE_LINK_CHANGE);
phylink_start(pp->phylink);
/* We may have called phy_speed_down before */
phy_speed_up(pp->dev->phydev);
netif_tx_start_all_queues(pp->dev);
}
@ -3568,6 +3572,9 @@ static void mvneta_stop_dev(struct mvneta_port *pp)
{
unsigned int cpu;
if (device_may_wakeup(&pp->dev->dev))
phy_speed_down(pp->dev->phydev, false);
phylink_stop(pp->phylink);
if (!pp->neta_armada3700) {
@ -4040,6 +4047,10 @@ static int mvneta_mdio_probe(struct mvneta_port *pp)
phylink_ethtool_get_wol(pp->phylink, &wol);
device_set_wakeup_capable(&pp->dev->dev, !!wol.supported);
/* PHY WoL may be enabled but device wakeup disabled */
if (wol.supported)
device_set_wakeup_enable(&pp->dev->dev, !!wol.wolopts);
return err;
}