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authorHeiner Kallweit <hkallweit1@gmail.com>2021-02-12 00:32:52 +0300
committerDavid S. Miller <davem@davemloft.net>2021-02-12 05:27:18 +0300
commit4c0d2e96ba055bd8911bb8287def4f8ebbad15b6 (patch)
treef09e8cb3a60b43e344229e57a379b52b1e105c78
parente12be9139cca26d689fe1a9257054b76752f725b (diff)
downloadlinux-4c0d2e96ba055bd8911bb8287def4f8ebbad15b6.tar.xz
net: phy: consider that suspend2ram may cut off PHY power
Claudiu reported that on his system S2R cuts off power to the PHY and after resuming certain PHY settings are lost. The PM folks confirmed that cutting off power to selected components in S2R is a valid case. Therefore resuming from S2R, same as from hibernation, has to assume that the PHY has power-on defaults. As a consequence use the restore callback also as resume callback. In addition make sure that the interrupt configuration is restored. Let's do this in phy_init_hw() and ensure that after this call actual interrupt configuration is in sync with phydev->interrupts. Currently, if interrupt was enabled before hibernation, we would resume with interrupt disabled because that's the power-on default. This fix applies cleanly only after the commit marked as fixed. I don't have an affected system, therefore change is compile-tested only. [0] https://lore.kernel.org/netdev/1610120754-14331-1-git-send-email-claudiu.beznea@microchip.com/ Fixes: 611d779af7ca ("net: phy: fix MDIO bus PM PHY resuming") Reported-by: Claudiu Beznea <claudiu.beznea@microchip.com> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/phy/phy_device.c53
1 files changed, 17 insertions, 36 deletions
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 80c2e646c093..71169e7d6177 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -300,50 +300,22 @@ static int mdio_bus_phy_resume(struct device *dev)
phydev->suspended_by_mdio_bus = 0;
- ret = phy_resume(phydev);
+ ret = phy_init_hw(phydev);
if (ret < 0)
return ret;
-no_resume:
- if (phydev->attached_dev && phydev->adjust_link)
- phy_start_machine(phydev);
-
- return 0;
-}
-
-static int mdio_bus_phy_restore(struct device *dev)
-{
- struct phy_device *phydev = to_phy_device(dev);
- struct net_device *netdev = phydev->attached_dev;
- int ret;
-
- if (!netdev)
- return 0;
-
- ret = phy_init_hw(phydev);
+ ret = phy_resume(phydev);
if (ret < 0)
return ret;
-
+no_resume:
if (phydev->attached_dev && phydev->adjust_link)
phy_start_machine(phydev);
return 0;
}
-static const struct dev_pm_ops mdio_bus_phy_pm_ops = {
- .suspend = mdio_bus_phy_suspend,
- .resume = mdio_bus_phy_resume,
- .freeze = mdio_bus_phy_suspend,
- .thaw = mdio_bus_phy_resume,
- .restore = mdio_bus_phy_restore,
-};
-
-#define MDIO_BUS_PHY_PM_OPS (&mdio_bus_phy_pm_ops)
-
-#else
-
-#define MDIO_BUS_PHY_PM_OPS NULL
-
+static SIMPLE_DEV_PM_OPS(mdio_bus_phy_pm_ops, mdio_bus_phy_suspend,
+ mdio_bus_phy_resume);
#endif /* CONFIG_PM */
/**
@@ -554,7 +526,7 @@ static const struct device_type mdio_bus_phy_type = {
.name = "PHY",
.groups = phy_dev_groups,
.release = phy_device_release,
- .pm = MDIO_BUS_PHY_PM_OPS,
+ .pm = pm_ptr(&mdio_bus_phy_pm_ops),
};
static int phy_request_driver_module(struct phy_device *dev, u32 phy_id)
@@ -1143,10 +1115,19 @@ int phy_init_hw(struct phy_device *phydev)
if (ret < 0)
return ret;
- if (phydev->drv->config_init)
+ if (phydev->drv->config_init) {
ret = phydev->drv->config_init(phydev);
+ if (ret < 0)
+ return ret;
+ }
- return ret;
+ if (phydev->drv->config_intr) {
+ ret = phydev->drv->config_intr(phydev);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
}
EXPORT_SYMBOL(phy_init_hw);