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

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Message-ID: <20140703133406.2d3e3a1d@armhf>
Date:	Thu, 3 Jul 2014 13:34:06 +0200
From:	Jean-Francois Moine <moinejf@...e.fr>
To:	Mark Brown <broonie@...nel.org>
Cc:	Andrew Lunn <andrew@...n.ch>,
	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 Thu, 3 Jul 2014 11:44:32 +0100
Mark Brown <broonie@...nel.org> wrote:

> > > I'd expect this to return an error for the busy DAI rather than just
> > > silently ignore it failing to start or (better) implement some control
> > > to let the user select which of the DAIs is active.  
> 
> > This is not an error. If the audio subsystem (DPCM, not the user)
> > chooses to activate both I2S and S/PDIF, this means the HDMI audio may
> > be taken either from I2S or from S/PDIF: both inputs have the right
> > format and rate.  
> 
> Your board happens to only be able to present the same input on both I2S
> and S/PDIF but that might not apply to other boards, they may be able to
> route different signals to each which would present a practical problem.

If there are two different streamss on I2S and S/PDIF, and if the audio
subsystem wants to route these streams to the same connector (widget
'hdmi-out'), then, somewhere, there should be a software or a design
bug. No?

Anyway, the tda998x cannot know if the double route is wanted or not.

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