[alsa-devel] [PATCH 2/2] ASoC: fsl_ssi: Fix number of words per frame for I2S-slave mode

[Nicolin Chen]

On Wed, Jun 29, 2016 at 09:50:24PM +0300, Alexander Shiyan wrote:
> >Среда, 29 июня 2016, 21:26 +03:00 от Nicolin Chen <nicoleotsuka at gmail.com>:
> >
> >On Wed, Jun 29, 2016 at 10:52:01AM +0300, Alexander Shiyan wrote:
> >
> >> >your failed case. Could you please tell me what were the FSclk,
> >> >BITclk and size of your case?
> > 
> >> Here is my oscillograms with/without patch:
> >> Bclk=12 MHz, sound is just a "cat /dev/urandom > /dev/dsp", i.e. FS=8 KHz, MONO.
> >> Upper (yellow) line is TXDATA, Lower (blue) is FS.
> >> 
> >> Measurement without patch:  https://cloud.mail.ru/public/Rcsv/xr88V5Sa1
> >> Measurement with patch:  https://cloud.mail.ru/public/NCwn/DQnzioQEL
> >
> >Thanks for the reply. So in the case without patch, it looks like
> >SSI just sent the data ignoring the slot size right?
> 
> I could be wrong, but think that WL (word length) still point to number of valid
> data bits within 32bit chunk (as defined for I2S-Master mode),
> but since DC=0, this cause to send next word to the channel again and again.

I see. Thanks for the fix.