linux-kernel - Re: [alsa-devel] Question on Compressed offload session

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Message-ID: <20141114170650.GG3815@sirena.org.uk>
Date:	Fri, 14 Nov 2014 17:06:50 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:	gsantosh@...eaurora.org, Mark Rutland <mark.rutland@....com>,
	Rob Herring <robh@...nel.org>,
	ALSA Development Mailing List <alsa-devel@...a-project.org>,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	Magnus <magnus.damm@...il.com>, linux-kernel@...r.kernel.org,
	Olof Johansson <olof@...om.net>, devicetree@...r.kernel.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	grant.likely@...aro.org, alsa-devel-bounces@...a-project.org,
	Kuninori Morimoto <kuninori.morimoto.gx@...il.com>
Subject: Re: [alsa-devel] Question on Compressed offload session

On Fri, Nov 14, 2014 at 10:28:54AM -0600, Pierre-Louis Bossart wrote:
> On 11/13/14, 10:08 PM, gsantosh@...eaurora.org wrote:

> >1) in Codec driver avoid adding hw_constraint during startup if compressed
> >session is routed, this recommend for codec driver to know that compress
> >session is routed to codec which I feel not the correct way to handle this

> >I was checking how to handle this situation in much better way.

> What exactly do you call a 'legacy codec'? If there is a DAI i am not sure I
> understand the problem.

I think what he's trying to say is that there's nothing automatic which
will ensure that constraints on the back end set by the CODEC driver
will be paid attention to.  This is true, it's pretty much entirely up
to the machine driver to make sure it gets the back end links right.

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