linux-kernel - Re: [RFC/PATCH v6 05/12] media: Reference count and power handling

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Message-Id: <201011251643.17313.laurent.pinchart@ideasonboard.com>
Date:	Thu, 25 Nov 2010 16:43:16 +0100
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	linux-media@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, lrg@...mlogic.co.uk,
	sakari.ailus@...well.research.nokia.com, lennart@...ttering.net
Subject: Re: [RFC/PATCH v6 05/12] media: Reference count and power handling

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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