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

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Message-ID: <20140702195154.47d6f6b4@armhf>
Date:	Wed, 2 Jul 2014 19:51:54 +0200
From:	Jean-Francois Moine <moinejf@...e.fr>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	Mark Brown <broonie@...nel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	devicetree@...r.kernel.org, alsa-devel@...a-project.org,
	lgirdwood@...il.com, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, Rob Clark <robdclark@...il.com>,
	Dave Airlie <airlied@...il.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ASoC: tda998x: add a codec to the HDMI transmitter

On Wed, 2 Jul 2014 18:56:28 +0200
Andrew Lunn <andrew@...n.ch> wrote:

> How well will this work with Russell concept of a front end and two
> backends? Can you uses your CODEC twice, once with the I2S backend and
> a second time with the S/PDIF backend?

Hi Andrew,

The TDA998x CODEC has two functions:
- it sets the possible formats and rates when the screen connects and
- it sets the audio input port when audio streaming starts.

I tested this CODEC with both DAPM and DPCM. If the audio subsystem
asks for streaming on both I2S and S/PDIF, only the last call is served
(this depends on the order of the DAI links in the audio card creation
table).

As I told to Russell, DPCM just asks for a 'system' DAI (front-end),
but it also asks for some additional code in the kirkwood DMA driver
because all PCMs are activated on streaming start.

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