Re: [PATCH] USB: power-management documenation update

[Tilman Schmidt <tilman@xxxxxxx>]

Alan Stern schrieb:
> This patch (as1014) was partly written by Tilman Schmidt.  It
> clarifies the USB power-management documentation by explaining that
> when a disconnect occurs, a suspend method call might not be followed
> by either a resume or a reset_resume call.
> 
> Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>

Signed-off-by: Tilman Schmidt <tilman@xxxxxxx>

> ---
> 
> Index: usb-2.6/Documentation/usb/power-management.txt
> ===================================================================
> --- usb-2.6.orig/Documentation/usb/power-management.txt
> +++ usb-2.6/Documentation/usb/power-management.txt
> @@ -278,6 +278,14 @@ optional.  The methods' jobs are quite s
>  	(although the interfaces will be in the same altsettings as
>  	before the suspend).
>  
> +If the device is disconnected or powered down while it is suspended,
> +the disconnect method will be called instead of the resume or
> +reset_resume method.  This is also quite likely to happen when
> +waking up from hibernation, as many systems do not maintain suspend
> +current to the USB host controllers during hibernation.  (It's
> +possible to work around the hibernation-forces-disconnect problem by
> +using the USB Persist facility.)
> +
>  The reset_resume method is used by the USB Persist facility (see
>  Documentation/usb/persist.txt) and it can also be used under certain
>  circumstances when CONFIG_USB_PERSIST is not enabled.  Currently, if a
> 


-- 
Tilman Schmidt                    E-Mail: tilman@xxxxxxx
Bonn, Germany
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