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

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Message-ID: <20140703182600.7a98c5b6@armhf>
Date:	Thu, 3 Jul 2014 18:26:00 +0200
From:	Jean-Francois Moine <moinejf@...e.fr>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Mark Brown <broonie@...nel.org>, Andrew Lunn <andrew@...n.ch>,
	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 Thu, 3 Jul 2014 16:43:25 +0100
Russell King - ARM Linux <linux@....linux.org.uk> wrote:

> What you're doing in kirkwood-i2s is providing two plain DAI links,
> and then insisting that only one can be active any any one time.
> 
> A DPCM solution provides at least one frontend DAI link and at least
> one backend DAI link.  Your code does not do this.

You know why I did not insert the DPCM code in the kirkwood driver: it
does not work. But, as I tested it end 2013, I still have the code.
Do you want I propose a patch?

> Which bit of "we need to support both I2S and SPDIF" in my previous
> emails was not clear.  Which bit of "We should only support SPDIF
> on the Cubox" was not clear?
> 
> I *fully* acknowledge that we need to support both, but I'm putting
> a _strong_ recommendation to you _with_ technical reasons why we
> should _only_ support SPDIF on the Cubox.

Sorry, I still don't see why only S/PDIF should be supported on the
Cubox. I have both, and both are working on HDMI. I hope someone will
tell me it also works on S/PDIF: there is no reason it could not.

I don't see your technical reasons: you know the constraints of each
protocol I2S and S/PDIF. If you don't want I2S, just don't declare it
in the DT (see my previous mail). You may also note that I did not put
any change relative to the Cubox DT in my patch.

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