On Saturday, November 17, 2012 05:19:57 PM Lan Tianyu wrote:
> This patch is to expose usb port's pm qos flags(pm_qos_no_power_off,
> pm_qos_remote_wakeup) to user space. User can set pm_qos_no_power_off
> flag to prohibit the port from being power off.
>
> Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
>From the PM perspective:
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> ---
> drivers/usb/core/port.c | 9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
> index 8b66aeb..f5842e6 100644
> --- a/drivers/usb/core/port.c
> +++ b/drivers/usb/core/port.c
> @@ -62,6 +62,7 @@ static void usb_port_device_release(struct device *dev)
> {
> struct usb_port *port_dev = to_usb_port(dev);
>
> + dev_pm_qos_hide_flags(dev);
> usb_acpi_unregister_power_resources(dev);
> kfree(port_dev);
> }
> @@ -145,8 +146,12 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1)
> if (retval)
> goto error_register;
>
> - pm_runtime_set_active(&port_dev->dev);
> - pm_runtime_enable(&port_dev->dev);
> + if (!dev_pm_qos_expose_flags(&port_dev->dev,
> + PM_QOS_FLAG_NO_POWER_OFF)) {
> + pm_runtime_set_active(&port_dev->dev);
> + pm_runtime_enable(&port_dev->dev);
> + }
> +
> usb_acpi_register_power_resources(&port_dev->dev);
>
> return 0;
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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