Re: [RFC PATCH] USB: enable "power/wakeup" to control remote wakeup in the runtime suspend

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Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx> writes:
> On Wed, Jul 18, 2012 at 10:52:22AM -0400, Alan Stern wrote:
>> On Wed, 18 Jul 2012, Oliver Neukum wrote:
>> 
>> > On Wednesday 18 July 2012 10:21:27 Alan Stern wrote:
>> > > On Wed, 18 Jul 2012, Oliver Neukum wrote:
>> > > 
>> > > > > 	I have a question that reset-resume still can not resolve firmware 
>> > > > > problem? I think this depend on driver. right?
>> > > > 
>> > > > Right, but this is not really useful information. We can infer from
>> > > > a lack of support for reset_resume() that we must not cut power.
>> > > > The reverse conclusion is invalid, unfortunately.
>> > > 
>> > > Why?  If the driver claims to support reset-resume then it must have a
>> > > way to insure that firmware is reloaded when necessary.
>> > 
>> > No, the device may morph. And we have generic drivers (btusb) that
>> > support devices after another driver (ath3k) has uploaded firmware.
>> 
>> True.  This would be a case where unbinding the driver is the only safe 
>> way to go.
>
> Hmm, but wouldn't both the bluetooth and wireless device have remote
> wakeup enabled when it was suspended? 

Not necessarily.  The driver will only request remote wakeup if the
device is opened.


Bjørn
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