On Fri, 4 Jan 2013, Lan Tianyu wrote:
> This patch is to add runtime pm callback for usb port device.
> Set/clear PORT_POWER feature in the resume/suspend callbak.
> Add portnum for struct usb_port to record port number. Do
> pm_rumtime_get_sync/put(portdev) when a device is plugged/unplugged
> to prevent it from being power off when it is active.
> --- a/drivers/usb/core/port.c
> +++ b/drivers/usb/core/port.c
> @@ -68,9 +69,42 @@ static void usb_port_device_release(struct device *dev)
> kfree(port_dev);
> }
>
> +static int usb_port_runtime_resume(struct device *dev)
> +{
> + struct usb_port *port_dev = to_usb_port(dev);
> + struct usb_device *hdev =
> + to_usb_device(dev->parent->parent);
> +
> + return usb_hub_set_port_power(hdev, port_dev->portnum,
> + true);
> +}
usb_port_runtime_resume can be called while the hub is suspended,
right? So it needs to call usb_autopm_get_interface and
usb_autopm_put_interface.
The same is probably true for usb_port_runtime_suspend.
Alan Stern
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