[alsa-devel] ASoC: pxa2xx-ssp

Daniel Ribeiro drwyrm at gmail.com
Sat Oct 25 07:32:47 CEST 2008

Em Sex, 2008-10-24 às 16:54 +0100, Liam Girdwood escreveu:
> On Thu, 2008-10-23 at 22:54 -0200, Daniel Ribeiro wrote:
> > Hi!
> > 
> > What is needed for [0] to be accepted on mainline linux?
> > 
> > [0]http://opensource.wolfsonmicro.com/cgi-bin/gitweb.cgi?p=linux-2.6-asoc.git;a=blob;f=sound/soc/pxa/pxa2xx-ssp.c;h=6b1baeece184e990c4254e2f43495013d4562c95;hb=e4d89cdd854b4a40c963adf434d261070c67b6bb
> > 
> When I last worked on this it was in need of updates for SSP register
> IO, clk API and more testing. It has the IO and clk stuff now.
> Does this code work well on your platform/board ?

	Not as it is.

	My sound codec needs 32bit ssp frames, even considering that it only
supports 16bit mono/stereo audio. I guess that it works with I2S
emulation mode, which pxa2xx-ssp.c dont support yet.

	After some time trying to understand the very poorly documented I2S/SSP
emulation on the pxa manual, i ended up with [1]. It works perfectly on
my board, with SND_SOC_DAIFMT_MSB.

	To ease your reading, attached is a diff against [0]. It is updated to
build on the latest linus tree and handles DAIFMT_I2S and DAIFMT_MSB

> If so, I guess we could scratch off the more testing part and consider
> it for the next merge window. Iirc it was also waiting on some pxa
> dependencies going upstream, so it may wait a little longer.
> I'm sure it's on Mark's long todo list....
> Liam 


Daniel Ribeiro
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