diff options
| -rw-r--r-- | drivers/net/phy/mdio_bus.c | 83 | ||||
| -rw-r--r-- | drivers/net/phy/phy_device.c | 110 | ||||
| -rw-r--r-- | include/linux/mdio.h | 2 |
3 files changed, 121 insertions, 74 deletions
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c index e6dddb086265..65ff8199bd09 100644 --- a/drivers/net/phy/mdio_bus.c +++ b/drivers/net/phy/mdio_bus.c @@ -561,95 +561,32 @@ static int mdio_bus_match(struct device *dev, struct device_driver *drv) } #ifdef CONFIG_PM - -static bool mdio_bus_phy_may_suspend(struct phy_device *phydev) -{ - struct device_driver *drv = phydev->mdio.dev.driver; - struct phy_driver *phydrv = to_phy_driver(drv); - struct net_device *netdev = phydev->attached_dev; - - if (!drv || !phydrv->suspend) - return false; - - /* PHY not attached? May suspend if the PHY has not already been - * suspended as part of a prior call to phy_disconnect() -> - * phy_detach() -> phy_suspend() because the parent netdev might be the - * MDIO bus driver and clock gated at this point. - */ - if (!netdev) - return !phydev->suspended; - - /* Don't suspend PHY if the attched netdev parent may wakeup. - * The parent may point to a PCI device, as in tg3 driver. - */ - if (netdev->dev.parent && device_may_wakeup(netdev->dev.parent)) - return false; - - /* Also don't suspend PHY if the netdev itself may wakeup. This - * is the case for devices w/o underlaying pwr. mgmt. aware bus, - * e.g. SoC devices. - */ - if (device_may_wakeup(&netdev->dev)) - return false; - - return true; -} - static int mdio_bus_suspend(struct device *dev) { - struct phy_device *phydev = to_phy_device(dev); + struct mdio_device *mdio = to_mdio_device(dev); - /* We must stop the state machine manually, otherwise it stops out of - * control, possibly with the phydev->lock held. Upon resume, netdev - * may call phy routines that try to grab the same lock, and that may - * lead to a deadlock. - */ - if (phydev->attached_dev && phydev->adjust_link) - phy_stop_machine(phydev); - - if (!mdio_bus_phy_may_suspend(phydev)) - return 0; + if (mdio->pm_ops && mdio->pm_ops->suspend) + return mdio->pm_ops->suspend(dev); - return phy_suspend(phydev); + return 0; } static int mdio_bus_resume(struct device *dev) { - struct phy_device *phydev = to_phy_device(dev); - int ret; - - if (!mdio_bus_phy_may_suspend(phydev)) - goto no_resume; + struct mdio_device *mdio = to_mdio_device(dev); - ret = phy_resume(phydev); - if (ret < 0) - return ret; - -no_resume: - if (phydev->attached_dev && phydev->adjust_link) - phy_start_machine(phydev); + if (mdio->pm_ops && mdio->pm_ops->resume) + return mdio->pm_ops->resume(dev); return 0; } static int mdio_bus_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); - if (ret < 0) - return ret; - - /* The PHY needs to renegotiate. */ - phydev->link = 0; - phydev->state = PHY_UP; + struct mdio_device *mdio = to_mdio_device(dev); - phy_start_machine(phydev); + if (mdio->pm_ops && mdio->pm_ops->restore) + return mdio->pm_ops->restore(dev); return 0; } diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c index 7a5222daff93..eb0b0ed32662 100644 --- a/drivers/net/phy/phy_device.c +++ b/drivers/net/phy/phy_device.c @@ -63,6 +63,115 @@ static struct phy_driver genphy_driver[GENPHY_DRV_MAX]; static LIST_HEAD(phy_fixup_list); static DEFINE_MUTEX(phy_fixup_lock); +#ifdef CONFIG_PM +static bool mdio_bus_phy_may_suspend(struct phy_device *phydev) +{ + struct device_driver *drv = phydev->mdio.dev.driver; + struct phy_driver *phydrv = to_phy_driver(drv); + struct net_device *netdev = phydev->attached_dev; + + if (!drv || !phydrv->suspend) + return false; + + /* PHY not attached? May suspend if the PHY has not already been + * suspended as part of a prior call to phy_disconnect() -> + * phy_detach() -> phy_suspend() because the parent netdev might be the + * MDIO bus driver and clock gated at this point. + */ + if (!netdev) + return !phydev->suspended; + + /* Don't suspend PHY if the attached netdev parent may wakeup. + * The parent may point to a PCI device, as in tg3 driver. + */ + if (netdev->dev.parent && device_may_wakeup(netdev->dev.parent)) + return false; + + /* Also don't suspend PHY if the netdev itself may wakeup. This + * is the case for devices w/o underlaying pwr. mgmt. aware bus, + * e.g. SoC devices. + */ + if (device_may_wakeup(&netdev->dev)) + return false; + + return true; +} + +static int mdio_bus_phy_suspend(struct device *dev) +{ + struct phy_device *phydev = to_phy_device(dev); + + /* We must stop the state machine manually, otherwise it stops out of + * control, possibly with the phydev->lock held. Upon resume, netdev + * may call phy routines that try to grab the same lock, and that may + * lead to a deadlock. + */ + if (phydev->attached_dev && phydev->adjust_link) + phy_stop_machine(phydev); + + if (!mdio_bus_phy_may_suspend(phydev)) + return 0; + + return phy_suspend(phydev); +} + +static int mdio_bus_phy_resume(struct device *dev) +{ + struct phy_device *phydev = to_phy_device(dev); + int ret; + + if (!mdio_bus_phy_may_suspend(phydev)) + goto no_resume; + + 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 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); + if (ret < 0) + return ret; + + /* The PHY needs to renegotiate. */ + phydev->link = 0; + phydev->state = PHY_UP; + + 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 + +#endif /* CONFIG_PM */ + /** * phy_register_fixup - creates a new phy_fixup and adds it to the list * @bus_id: A string which matches phydev->mdio.dev.bus_id (or PHY_ANY_ID) @@ -165,6 +274,7 @@ struct phy_device *phy_device_create(struct mii_bus *bus, int addr, int phy_id, mdiodev->dev.parent = &bus->dev; mdiodev->dev.bus = &mdio_bus_type; mdiodev->bus = bus; + mdiodev->pm_ops = MDIO_BUS_PHY_PM_OPS; mdiodev->addr = addr; mdiodev->flags = MDIO_DEVICE_FLAG_PHY; diff --git a/include/linux/mdio.h b/include/linux/mdio.h index 8cd9579e18ea..9f844d372ed5 100644 --- a/include/linux/mdio.h +++ b/include/linux/mdio.h @@ -15,7 +15,7 @@ struct mii_bus; struct mdio_device { struct device dev; - + const struct dev_pm_ops *pm_ops; struct mii_bus *bus; /* Bus address of the MDIO device (0-31) */ int addr; |