linux-kernel - RE: USB remote wakeup through gpio interrupt

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Date:	Thu, 6 Mar 2014 06:05:13 +0000
From:	Peter Chen <Peter.Chen@...escale.com>
To:	Jagdish Gedia <jvgediya@...il.com>
CC:	Alan Stern <stern@...land.harvard.edu>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: USB remote wakeup through gpio interrupt



 
> 
> Hi Peter,
> 
> Thanks for your reply.
> 
> I can use pm_runtime_get in interrupt handler, but i am not getting your
> idea of using pm_runtime_put in interrupt handler?
> 

After your device finishes using usb, it may need to toggle gpio to trigger
interrupt, and you can suspend usb at this interrupt handler using pm_runtime_put.

> My device is usb telephony modem, which will give interrupt through gpio
> when call comes. so at that time i want to wakeup the usb functionality
> as remote wakeup is not working properly.
> 
> will pm_runtime_put suspend the device immidiately or it will not suspend
> the device till it is in use?
> 

It should suspend device immediately if you have not set any timeout value
for runtime. You call pm_runtime_put, it means you want to stop using device,
the host will stop sending SOF after it finishes suspending bus routine.

Peter
 

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