linux-kernel - Re: [alsa-devel] [PATCH v3 4/5] ASoC: tda998x: adjust the audio hw parameters from EDID

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Date:	Wed, 5 Feb 2014 19:07:32 +0100
From:	Jean-Francois Moine <moinejf@...e.fr>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	Mark Brown <broonie@...nel.org>, alsa-devel@...a-project.org,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	Rob Clark <robdclark@...il.com>,
	Dave Airlie <airlied@...il.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [alsa-devel] [PATCH v3 4/5] ASoC: tda998x: adjust the audio hw
 parameters from EDID

On Wed, 05 Feb 2014 10:19:22 +0100
Lars-Peter Clausen <lars@...afoo.de> wrote:

> > So, in the CODEC, I don't see how I could update the parameters
> > dictated by the EDID otherwise in changing the DAI driver parameters.
> >  
> 
> The startup function is the right place. But instead of modifying the DAI 
> use snd_pcm_hw_constraint_mask64(), snd_pcm_hw_constraint_list(), etc. to 
> setup the additional constraints that come from the EDID.

It is more complicated, but it works. Nevertheless, I have 2 problems:

- snd_pcm_hw_constraint_list() keeps a pointer to the list, so, it
  cannot be in the stack. It fix this with static struct and rate array.

- snd_pcm_hw_constraint_mask64() is not exported.
  Is there an other way to set constraints on the formats/sample widths?

-- 
Ken ar c'hentañ	|	      ** Breizh ha Linux atav! **
Jef		|		http://moinejf.free.fr/
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