linux-kernel - Re: [PATCH v9 3/4] ASoC: tda998x: add a codec to the HDMI transmitter

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Message-ID: <20150113102455.4f29cff5@armhf>
Date:	Tue, 13 Jan 2015 10:24:55 +0100
From:	Jean-Francois Moine <moinejf@...e.fr>
To:	Andrew Jackson <Andrew.Jackson@....com>
Cc:	Mark Brown <broonie@...nel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Dave Airlie <airlied@...il.com>, Jyri Sarha <jsarha@...com>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 3/4] ASoC: tda998x: add a codec to the HDMI
 transmitter

On Fri, 09 Jan 2015 17:39:08 +0000
Andrew Jackson <Andrew.Jackson@....com> wrote:

> > +       snd_pcm_hw_constraint_minmax(runtime,
> > +                               SNDRV_PCM_HW_PARAM_CHANNELS,
> > +                               1, sad[SAD_MX_CHAN_I]);  
> 
> In the light of our discussions elsewhere [1], shouldn't this
> be constrained by the number of hardware channels that the TDA998x
> supports too?  That is, the maximum number of channels should
> be the lesser of sd[SAD_MX_CHAN_I] and number_of_I2S channels 
> (or S/PDIF channels if so configured).

snd_pcm_hw_constraint_minmax() does the job from the min/max numbers of
channels in the DAI definition and the real max number of channels will
be set from audio ports declared in the DT.

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