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-rw-r--r--drivers/net/phy/mdio_bus.c54
1 files changed, 40 insertions, 14 deletions
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 811a637695ca..bb29ae3ff17d 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -21,6 +21,7 @@
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/delay.h>
+#include <linux/device.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
@@ -286,33 +287,58 @@ static int mdio_bus_match(struct device *dev, struct device_driver *drv)
(phydev->phy_id & phydrv->phy_id_mask));
}
+static bool mdio_bus_phy_may_suspend(struct phy_device *phydev)
+{
+ struct device_driver *drv = phydev->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 (!netdev)
+ return true;
+
+ /*
+ * 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;
+}
+
/* Suspend and resume. Copied from platform_suspend and
* platform_resume
*/
static int mdio_bus_suspend(struct device * dev, pm_message_t state)
{
- int ret = 0;
- struct device_driver *drv = dev->driver;
- struct phy_driver *phydrv = to_phy_driver(drv);
+ struct phy_driver *phydrv = to_phy_driver(dev->driver);
struct phy_device *phydev = to_phy_device(dev);
- if (drv && phydrv->suspend && !device_may_wakeup(phydev->dev.parent))
- ret = phydrv->suspend(phydev);
-
- return ret;
+ if (!mdio_bus_phy_may_suspend(phydev))
+ return 0;
+ return phydrv->suspend(phydev);
}
static int mdio_bus_resume(struct device * dev)
{
- int ret = 0;
- struct device_driver *drv = dev->driver;
- struct phy_driver *phydrv = to_phy_driver(drv);
+ struct phy_driver *phydrv = to_phy_driver(dev->driver);
struct phy_device *phydev = to_phy_device(dev);
- if (drv && phydrv->resume && !device_may_wakeup(phydev->dev.parent))
- ret = phydrv->resume(phydev);
-
- return ret;
+ if (!mdio_bus_phy_may_suspend(phydev))
+ return 0;
+ return phydrv->resume(phydev);
}
struct bus_type mdio_bus_type = {
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