From: Florian Fainelli f.fainelli@gmail.com
[ Upstream commit 3ce9f2bef75528936c78a7053301f5725f622f3a ]
Commit 744d23c71af3 ("net: phy: Warn about incorrect mdio_bus_phy_resume() state") unveiled that the smsc911x driver was not properly stopping and restarting the PHY during suspend/resume. Correct that by indicating that the MAC is in charge of PHY PM operations and ensure that all MDIO bus activity is quiescent during suspend.
Tested-by: Geert Uytterhoeven geert+renesas@glider.be Tested-by: Marek Szyprowski m.szyprowski@samsung.com Fixes: fba863b81604 ("net: phy: make PHY PM ops a no-op if MAC driver manages PHY PM") Fixes: 2aa70f864955 ("net: smsc911x: Quieten netif during suspend") Signed-off-by: Florian Fainelli f.fainelli@gmail.com Link: https://lore.kernel.org/r/20220825023951.3220-1-f.fainelli@gmail.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/smsc/smsc911x.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/net/ethernet/smsc/smsc911x.c b/drivers/net/ethernet/smsc/smsc911x.c index 3bf20211cceb4..3829c2805b16c 100644 --- a/drivers/net/ethernet/smsc/smsc911x.c +++ b/drivers/net/ethernet/smsc/smsc911x.c @@ -1037,6 +1037,8 @@ static int smsc911x_mii_probe(struct net_device *dev) return ret; }
+ /* Indicate that the MAC is responsible for managing PHY PM */ + phydev->mac_managed_pm = true; phy_attached_info(phydev);
phy_set_max_speed(phydev, SPEED_100); @@ -2587,6 +2589,8 @@ static int smsc911x_suspend(struct device *dev) if (netif_running(ndev)) { netif_stop_queue(ndev); netif_device_detach(ndev); + if (!device_may_wakeup(dev)) + phy_stop(ndev->phydev); }
/* enable wake on LAN, energy detection and the external PME @@ -2628,6 +2632,8 @@ static int smsc911x_resume(struct device *dev) if (netif_running(ndev)) { netif_device_attach(ndev); netif_start_queue(ndev); + if (!device_may_wakeup(dev)) + phy_start(ndev->phydev); }
return 0;