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phy: Move PHY PM operations into phy_device 

The MDIO PM operations are really PHY device PM operations. So move
them into phy_device. This will be needed when we support devices on
the mdio bus which are not PHYs.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Lunn 2016-01-06 20:11:21 +01:00 committed by David S. Miller
parent 0071f56e46
commit bc87922ff5
3 changed files with 121 additions and 74 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

83
drivers/net/phy/mdio_bus.c
View File

@ -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->pm_ops && mdio->pm_ops->suspend)
return mdio->pm_ops->suspend(dev);
if (!mdio_bus_phy_may_suspend(phydev))
return 0;
return phy_suspend(phydev);
return 0;
}
static int mdio_bus_resume(struct device *dev)
{
struct phy_device *phydev = to_phy_device(dev);
int ret;
struct mdio_device *mdio = to_mdio_device(dev);
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);
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;
struct mdio_device *mdio = to_mdio_device(dev);
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);
if (mdio->pm_ops && mdio->pm_ops->restore)
return mdio->pm_ops->restore(dev);
return 0;
}

110
drivers/net/phy/phy_device.c
View File

@ -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;

2
include/linux/mdio.h
View File

@ -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;