From 7d0feb27904624a06d61ff9d72738b8d27b681fb Mon Sep 17 00:00:00 2001 From: =?utf8?q?Daniel=20Gonz=C3=A1lez=20Cabanelas?= Date: Tue, 12 May 2020 19:59:48 +0200 Subject: [PATCH] net: mvneta: speed down the PHY, if WoL used, to save energy MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: David S. Miller --- drivers/net/ethernet/marvell/mvneta.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c index 51889770958d8..e0e9e56830c04 100644 --- a/drivers/net/ethernet/marvell/mvneta.c +++ b/drivers/net/ethernet/marvell/mvneta.c @@ -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; } -- 2.39.5