From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Mark Brown <broonie@opensource.wolfsonmicro.com>
Subject: Re: [RFC/PATCH v6 05/12] media: Reference count and power handling
Date: Thu, 25 Nov 2010 16:43:16 +0100
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Cc: linux-media@vger.kernel.org, linux-omap@vger.kernel.org,
        linux-kernel@vger.kernel.org, lrg@slimlogic.co.uk,
        sakari.ailus@maxwell.research.nokia.com, lennart@poettering.net
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Hi Mark,

On Thursday 25 November 2010 14:49:08 Mark Brown wrote:
> On Thu, Nov 25, 2010 at 03:28:12AM +0100, Laurent Pinchart wrote:
> > 	If the entity is of node type, the power change is distributed to
> > 	all connected entities. For non-nodes it only affects that very
> > 	node. A mutex is used to serialise access to the entity graph.
> 
> ASoC has its own power management stuff which doesn't *quite* map onto
> this one as-is.  The power determination stuff is essentially identical
> (and this is actually nicer) but we have a separate postprocessing stage
> that actually applies the changes in a sequence which minimises audible
> issues caused by doing things in a bad order (eg, power down a PGA
> before you turn off inputs).  This is noddy enough to implement, though
> - we just need a pre and post run notifications to set up and implement
> the changes I think.

That sounds feasible. Sakari, you've implemented power management, what do you 
think about this ?


> BTW, I notice you've not CCed the ALSA list, Liam, Takashi or Jaroslav
> on any of this - might be good.

I've just subscrived to the alsa-devel list. I will make sure to CC it, as 
well as Liam, Takashi and Jaroslav, on the next version of the patches. Sorry 
about the missing CC's in these e-mails.

-- 
Regards,

Laurent Pinchart
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