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

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Message-ID: <20101125134908.GC24208@opensource.wolfsonmicro.com>
Date:	Thu, 25 Nov 2010 13:49:08 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.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

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.

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