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smsc95xx: enable power saving mode during system suspend

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This patch enables the device to enter its lowest power SUSPEND2
state during system suspend, instead of staying up using full power.

Patch updated to not add two pointers to .suspend & .resume.

Patch updated to replace BUG_ON with WARN_ON_ONCE and return.

Signed-off-by: Steve Glendinning <steve.glendinning@shawell.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Steve Glendinning
2012-09-28 00:07:11 +00:00
committed by David S. Miller
parent c954679cf7
commit b5a0447586
2 changed files with 32 additions and 2 deletions
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28
drivers/net/usb/smsc95xx.c
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@@ -1018,6 +1018,32 @@ static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
}
}
static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
{
struct usbnet *dev = usb_get_intfdata(intf);
int ret;
u32 val;
if (WARN_ON_ONCE(!dev))
return -EINVAL;
ret = usbnet_suspend(intf, message);
check_warn_return(ret, "usbnet_suspend error");
netdev_info(dev->net, "entering SUSPEND2 mode");
ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
check_warn_return(ret, "Error reading PM_CTRL");
val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
val |= PM_CTL_SUS_MODE_2;
ret = smsc95xx_write_reg(dev, PM_CTRL, val);
check_warn_return(ret, "Error writing PM_CTRL");
return 0;
}
static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
{
skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2);
@@ -1280,7 +1306,7 @@ static struct usb_driver smsc95xx_driver = {
.name = "smsc95xx",
.id_table = products,
.probe = usbnet_probe,
.suspend = usbnet_suspend,
.suspend = smsc95xx_suspend,
.resume = usbnet_resume,
.reset_resume = usbnet_resume,
.disconnect = usbnet_disconnect,