[alsa-devel] [PATCH 4/7] ASoC: Fix Zylonite voice interface stereo configurations

Mark Brown broonie at sirena.org.uk
Wed Feb 25 17:54:59 CET 2009

On Wed, Feb 25, 2009 at 05:41:13PM +0100, Daniel Mack wrote:

> Is there a thread you can point me to or where have people reported such
> things? Grep'ing the archives did unveil anything regarding this.

Private e-mail only, sorry.

> > The I2S frame length depends on the number of bits per sample.

> Well, as far as I got it, these are different things in the register
> set. The I2S frame is 64 bits per definition (32 bits for each channel),
> and this is what the cs4270 requires to use.

Ah, that's not true of I2S devices in general - most only require as
many bit clocks as they have data.  I've only ever tested with such

> The particular problem with the PXA SSP mode is that I've not yet seen a
> configuration (neighter in slave nor in master mode) where it sends out
> 16 bits of left channel information, followed by 16 bits of zeros, then
> 16 bits of right channel and finally another 16bits of zeros (which
> exactly what they talk about in the 'i2s via ssp' application note).
> Has anyone ever got that?

Not to my knowledge.

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