linux-kernel - Re: [PATCH 5/5] i2c: tegra: convert normal suspend/resume to *

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Message-ID: <20120724125237.GB22576@sirena.org.uk>
Date:	Tue, 24 Jul 2012 13:52:38 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Peter De Schrijver <pdeschrijver@...dia.com>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	Laxman Dewangan <ldewangan@...dia.com>,
	"w.sang@...gutronix.de" <w.sang@...gutronix.de>,
	"khali@...ux-fr.org" <khali@...ux-fr.org>,
	"ben-linux@...ff.org" <ben-linux@...ff.org>,
	Stephen Warren <swarren@...dia.com>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	Colin Cross <ccross@...roid.com>
Subject: Re: [PATCH 5/5] i2c: tegra: convert normal suspend/resume to
 *_noirq

On Tue, Jul 24, 2012 at 12:13:58PM +0300, Peter De Schrijver wrote:
> On Mon, Jul 23, 2012 at 08:24:38PM +0200, Stephen Warren wrote:

> > IIRC, I proposed it before solely to solve some suspend/resume ordering
> > issues, and Colin Cross NAKd it. These days, deferred probe should make
> > this change unnecessary.

> How does deferred probe solve this? Iirc the problem is that i2c is needed to
> talk to the PMIC, so we need to make sure i2c is shutdown last because drivers
> might want to do regulator control in the suspend function.

With probe deferral the drivers will be after the regulator driver in
the DPM list and so be suspended first.
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