Date: Tue, 25 Nov 2014 08:45:44 -0600
From: Felipe Balbi <balbi@ti.com>
To: Peter Chen <Peter.Chen@freescale.com>
CC: Kiran Raparthy <kiran.kumar@linaro.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Felipe Balbi <balbi@ti.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
        Android Kernel Team <kernel-team@android.com>,
        John Stultz <john.stultz@linaro.org>,
        Sumit Semwal <sumit.semwal@linaro.org>,
        Arve =?iso-8859-1?B?SGr4bm5lduVn?= <arve@android.com>,
        Benoit Goby <benoit@android.com>, Todd Poynor <toddpoynor@google.com>
Subject: Re: [PATCH v3 3/3] usb: phy: hold wakeupsource when USB is
 enumerated in peripheral mode
Message-ID: <20141125144544.GC6360@saruman>
Reply-To: <balbi@ti.com>
References: <1416849900-29959-1-git-send-email-kiran.kumar@linaro.org>
 <1416849900-29959-3-git-send-email-kiran.kumar@linaro.org>
 <15cad5ef7627483cbba96e05fe180813@BN1PR0301MB0772.namprd03.prod.outlook.com>
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On Tue, Nov 25, 2014 at 07:06:18AM +0000, Peter Chen wrote:
> =20
> >=20
> > usb: phy: hold wakeupsource when USB is enumerated in peripheral mode
> >=20
> > Some systems require a mechanism to prevent system to enter into suspend
> > state when USB is connected and enumerated in peripheral mode.
> >=20
> > This patch provides an interface to hold a wakeupsource to prevent susp=
end.
> > PHY drivers can use this interface when USB is connected and enumerated=
 in
> > peripheral mode.
> >=20
> > A timed wakeupsource is temporarily held on USB disconnect events, to a=
llow
> > the rest of the system to react to the USB disconnection (dropping host
> > sessions, updating charger status, etc.) prior to re-allowing suspend.
> >=20
>=20
> Hi Kiran & Felipe,
>=20
> Just two questions for this series
>=20
> - Will it be the default behavior for all peripheral drivers?
> - If the peripheral driver's PHY driver does not vbus event, how to
> support it?
> For example, chipidea udc driver has its vbus interface at its
> controller register.

hmm, good point. Since it's so late, I'll just go ahead and drop
$subject from v3.20. Let's delay only $subject to v3.20 merge window so
we have some more time to discuss these details.

cheers

--=20
balbi

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