net: smsc911x: Stop and start PHY during suspend and resume

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>

diff --git a/drivers/net/ethernet/smsc/smsc911x.c b/drivers/net/ethernet/smsc/smsc911x.c
index 3bf2021..3829c28 100644 (file)
--- 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;