linux-kernel - Re: [linux-pm] [PATCH 0/8] Suspend block api (version 6)

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Date:	Thu, 13 May 2010 16:48:40 -0700
From:	Brian Swetland <swetland@...gle.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Greg KH <gregkh@...e.de>,
	Daniel Walker <dwalker@...o99.com>,
	Matthew Garrett <mjg@...hat.com>,
	Paul Walmsley <paul@...an.com>,
	"Arve Hj?nnev?g" <arve@...roid.com>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
	Tony Lindgren <tony@...mide.com>,
	Kevin Hilman <khilman@...prootsystems.com>,
	Alan Stern <stern@...land.harvard.edu>, magnus.damm@...il.com,
	"Theodore Ts'o" <tytso@....edu>,
	mark gross <mgross@...ux.intel.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Geoff Smith <geoffx.smith@...el.com>,
	"Beno?t Cousson" <b-cousson@...com>, linux-omap@...r.kernel.org,
	Vitaly Wool <vitalywool@...il.com>,
	Liam Girdwood <lrg@...mlogic.co.uk>
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 6)

On Thu, May 13, 2010 at 4:36 PM, Mark Brown
<broonie@...nsource.wolfsonmicro.com> wrote:
>
>> I'm not a big fan of suspend blockers myself, but let's face it, _currently_
>> there's no alternative and we need to stop the trend, the sooner the better.
>
> I don't think this is a major part of the trend - like I say, the fact
> that people have been working with an old kernel version is generally
> a much more substantial issue than the wakelocks in the code I've seen.

Current published trees are based on .32 (used for the coming-soon
froyo release that's been in late QA for a while now) and forward
development is moving to .34 post final (or in the case of tegra2,
tracking .34-rc series as it happens).  We've been actively snapping
up to track mainline since we started doing this around 2.6.16.  We'd
*love* to be able to get more stuff sanely upstream instead of
maintaining branches and rebasing every other mainline release or so.

> The issue was that when I originally noticed the patch series was being
> considered for mainline again was that one effect of using it in a
> mobile phone with the standard Linux embedded audio subsystem would be
> to break use cases such as audio on voice calls, which isn't really
> desirable, and that there was no roadmap for how to fix that or any
> other subsystems with similar issues.  This didn't seem like it would
> have been a good situation given that the major user is expected to be
> Android, which is mainly for mobile phones.

I'd love to have a separate discussion on using standard linux
embedded audio for mobile devices -- one of my goals for 2010 is to
try to migrate from our "one off" approach on MSM to making use of
ALSA and standard interfaces.  I have a lot of questions about handing
encoded data (mp3/aac/etc) that will be processed by the DSP, how to
approach routing control, and how to best interact with the
user/kernel interface, etc.

Brian
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