[alsa-devel] trouble with alsa, wolfson, and TI OMAP35xx McBSP

Mark Brown broonie at sirena.org.uk
Thu Apr 23 13:15:11 CEST 2009

On Thu, Apr 23, 2009 at 12:04:05PM +0100, Alan Horstmann wrote:

> Does this indicate that the implementation/drivers of i2s has a fundamental 
> ambiguity?  Is it not rigidly defined which channel should follow a rising 
> edge of L/R clock?

It's clearly defined to be that the left channel follows the falling
edge of LRCLK (ie, the left channel data is transmitted while LRCLK is
low).  However, not all CPUs do a wonderful job of implementing this -
some of the older Samsung chips need a workaround for synchronisation,
for example.

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