linux-kernel - Re: [PATCH] ASoC: atmel_ssc_dai: note buggy I2S support when the codec masters LRCLK

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Message-ID: <20160427162344.GA3217@sirena.org.uk>
Date:	Wed, 27 Apr 2016 17:23:44 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Peter Rosin <peda@...ntia.se>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: atmel_ssc_dai: note buggy I2S support when the
 codec masters LRCLK

On Wed, Apr 27, 2016 at 11:06:33AM +0200, Peter Rosin wrote:

> While the start condition is correct for the left channel word in the I2S
> case, it is not correct that the right channel word follows immediately
> after the left channel word. The start of the right channel word should
> be triggered by a rising edge on LRCLK in the I2S case, something which
> simply does not happen.

Almost every programmable serial port does this, it's a very common
issue which is why we always try to go for exact clocking where we can -
it greatly improves the interoperability for I2S if there are no dead
clocks.

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