linux-kernel - Re: [RFC 1/2] USB: OTG: Hold wakeupsource when VBUS present

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Date:	Tue, 2 Sep 2014 17:32:01 -0700
From:	Todd Poynor <toddpoynor@...gle.com>
To:	balbi@...com
Cc:	Kiran Kumar Raparthy <kiran.kumar@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org,
	Android Kernel Team <kernel-team@...roid.com>,
	John Stultz <john.stultz@...aro.org>,
	Arve Hj�nnev�g <arve@...roid.com>,
	Benoit Goby <benoit@...roid.com>,
	Ruchi Kandoi <kandoiruchi@...gle.com>,
	Badhri Jagan Sridharan <badhri@...gle.com>
Subject: Re: [RFC 1/2] USB: OTG: Hold wakeupsource when VBUS present

On Fri, Aug 29, 2014 at 1:50 PM, Felipe Balbi <balbi@...com> wrote:
> Hi,
>
> On Wed, Aug 27, 2014 at 02:58:30PM -0700, Todd Poynor wrote:
>> On Fri, Aug 22, 2014 at 10:12 AM, Felipe Balbi <balbi@...com> wrote:
>> ...
>> > you never explain why this is needed and you have also added some
>> > information to commit log which shouldn't be here.
>>
>> Android uses this to prevent suspend from interfering with USB
>> peripheral traffic, notably adb.
>
> aaaaah, that's because Android freezes userspace right ?

Yes, and only wakeup interrupts will be enabled; it is a suspend-to-RAM.


Todd
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