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net: smsc911x: Make Runtime PM handling more fine-grained

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Currently the smsc911x driver has mininal power management: during
driver probe, the device is powered up, and during driver remove, it is
powered down.

Improve power management by making it more fine-grained:
  1. Power the device down when driver probe is finished,
  2. Power the device (down) when it is opened (closed),
  3. Make sure the device is powered during PHY access.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20210118150857.796943-1-geert+renesas@glider.be
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Geert Uytterhoeven 2021-01-18 16:08:57 +01:00 committed by Jakub Kicinski
parent eaaf611228
commit 1e30b8d755
1 changed files with 9 additions and 1 deletions
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10
drivers/net/ethernet/smsc/smsc911x.c
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@ -557,6 +557,7 @@ static int smsc911x_mii_read(struct mii_bus *bus, int phyaddr, int regidx)
unsigned int addr;
int i, reg;
pm_runtime_get_sync(bus->parent);
spin_lock_irqsave(&pdata->mac_lock, flags);
/* Confirm MII not busy */
@ -582,6 +583,7 @@ static int smsc911x_mii_read(struct mii_bus *bus, int phyaddr, int regidx)
out:
spin_unlock_irqrestore(&pdata->mac_lock, flags);
pm_runtime_put(bus->parent);
return reg;
}
@ -594,6 +596,7 @@ static int smsc911x_mii_write(struct mii_bus *bus, int phyaddr, int regidx,
unsigned int addr;
int i, reg;
pm_runtime_get_sync(bus->parent);
spin_lock_irqsave(&pdata->mac_lock, flags);
/* Confirm MII not busy */
@ -623,6 +626,7 @@ static int smsc911x_mii_write(struct mii_bus *bus, int phyaddr, int regidx,
out:
spin_unlock_irqrestore(&pdata->mac_lock, flags);
pm_runtime_put(bus->parent);
return reg;
}
@ -1589,6 +1593,8 @@ static int smsc911x_open(struct net_device *dev)
int retval;
int irq_flags;
pm_runtime_get_sync(dev->dev.parent);
/* find and start the given phy */
if (!dev->phydev) {
retval = smsc911x_mii_probe(dev);
@ -1735,6 +1741,7 @@ mii_free_out:
phy_disconnect(dev->phydev);
dev->phydev = NULL;
out:
pm_runtime_put(dev->dev.parent);
return retval;
}
@ -1766,6 +1773,7 @@ static int smsc911x_stop(struct net_device *dev)
dev->phydev = NULL;
}
netif_carrier_off(dev);
pm_runtime_put(dev->dev.parent);
SMSC_TRACE(pdata, ifdown, "Interface stopped");
return 0;
@ -2334,7 +2342,6 @@ static int smsc911x_drv_remove(struct platform_device *pdev)
free_netdev(dev);
pm_runtime_put(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return 0;
@ -2540,6 +2547,7 @@ static int smsc911x_drv_probe(struct platform_device *pdev)
}
spin_unlock_irq(&pdata->mac_lock);
pm_runtime_put(&pdev->dev);
netdev_info(dev, "MAC Address: %pM\n", dev->dev_addr);