linux-kernel - Re: [PATCH v5 1/4] Runtime Interpreted Power Sequences

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Message-ID: <20120907081501.GA17749@opensource.wolfsonmicro.com>
Date:	Fri, 7 Sep 2012 16:15:03 +0800
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Alex Courbot <acourbot@...dia.com>
Cc:	Heiko Stübner <heiko@...ech.de>,
	Stephen Warren <swarren@...dia.com>,
	Thierry Reding <thierry.reding@...onic-design.de>,
	Simon Glass <sjg@...omium.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Anton Vorontsov <cbou@...l.ru>,
	David Woodhouse <dwmw2@...radead.org>,
	Arnd Bergmann <arnd@...db.de>,
	Leela Krishna Amudala <leelakrishna.a@...il.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v5 1/4] Runtime Interpreted Power Sequences

On Fri, Sep 07, 2012 at 05:04:24PM +0900, Alex Courbot wrote:

> If e.g. the power on sequence fails at step N (of M steps for that sequence), 
> one could try playing the corresponding power off sequence (either completely 
> of from step M - N), but then again we cannot rely on sequences to be 
> perfectly symetrical. Maybe this is more something for the calling driver to 
> check for and control?

That had been my thought too - depending on what the sequence is for it
may be that the corrective action is something very different to
reversing the sequence, for example a device reset may be required.
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