linux-kernel - Re: [RFC v5] usb: phy: Hold wakeupsource when USB is enumerated in peripheral mode

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Message-ID: <20141105194047.GQ6548@saruman>
Date:	Wed, 5 Nov 2014 13:40:47 -0600
From:	Felipe Balbi <balbi@...com>
To:	Kiran Kumar Raparthy <kiran.kumar@...aro.org>
CC:	<linux-kernel@...r.kernel.org>,
	Todd Poynor <toddpoynor@...gle.com>,
	Kishon Vijay Abraham I <kishon@...com>,
	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-usb@...r.kernel.org>,
	Android Kernel Team <kernel-team@...roid.com>,
	John Stultz <john.stultz@...aro.org>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Arve Hjďż˝nnevďż˝g <arve@...roid.com>,
	Benoit Goby <benoit@...roid.com>
Subject: Re: [RFC v5] usb: phy: Hold wakeupsource when USB is enumerated in
 peripheral mode

On Tue, Nov 04, 2014 at 03:30:54PM +0530, Kiran Kumar Raparthy wrote:
> From: Todd Poynor <toddpoynor@...gle.com>
> 
> usb: phy: Hold wakeupsource when USB is enumerated in peripheral mode
> 
> Some systems require a mechanism to prevent system to enter into suspend
> state when USB is connected and enumerated in peripheral mode.
> 
> This patch provides an interface to hold a wakeupsource to prevent suspend.
> PHY drivers can use this interface when USB is connected and enumerated in
> peripheral mode.
> 
> A timed wakeupsource is temporarily held on USB disconnect events, to allow
> the rest of the system to react to the USB disconnection (dropping host
> sessions, updating charger status, etc.) prior to re-allowing suspend.
> 
> Cc: Kishon Vijay Abraham I <kishon@...com>
> Cc: Felipe Balbi <balbi@...com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-usb@...r.kernel.org
> Cc: Android Kernel Team <kernel-team@...roid.com>
> Cc: John Stultz <john.stultz@...aro.org>
> Cc: Sumit Semwal <sumit.semwal@...aro.org>
> Cc: Arve Hjřnnevĺg <arve@...roid.com>
> Cc: Benoit Goby <benoit@...roid.com>
> Signed-off-by: Todd Poynor <toddpoynor@...gle.com>
> [kiran: Added context to commit message, squished build fixes
> from Benoit Goby and Arve Hjřnnevĺg, changed wakelocks usage
> to wakeupsource, merged Todd's refactoring logic and simplified
> the structures and code and addressed community feedback]
> Signed-off-by: Kiran Raparthy <kiran.kumar@...aro.org>

you still didn't get this right. I asked that you introduce
usb_phy_set_event() as a separate patch, then make PHY drivers use it
and only on a third patch should you hold a wakeupsource.

-- 
balbi

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