[alsa-devel] [PATCH 1/1] ASoC: Fix compilation error with davinci-sffsdr module

Mark Brown broonie at sirena.org.uk
Thu Jan 15 21:01:22 CET 2009

On Thu, Jan 15, 2009 at 02:54:54PM -0500, Hugo Villeneuve wrote:
> Mark Brown <broonie at sirena.org.uk> wrote:

> > > The breakage I see when I run the aplay utility is this:

> > >   aplay: pcm_write:1394: write error: Input/output error

> > > davinci-git version is the latest as of january 14
> > > (2.6.28-davinci1-06546-gcfb152b)

> > Hrm, OK.  That's not terribly informative - does the error get
> > reported after about 10 seconds by any chance?  I suspect that DMA
> > just isn't happening.

> Sorry about the non-verbosity :)

I actually meant the error message rather than your posting, sorry!

> Yes it happens almost exactly after 10 seconds. I?m not an expert with
> audio nor DMA, but can you indicate me where I should be looking for
> signs of trouble (which source files for example)?

sound/soc/davinci/davinci-pcm.c and the underlying DMA APIs it calls.  I
wouldn't be surprised if either there had been some change in the DMA
APIs that required an update in the driver or the DMA APIs haven't been
fully merged.

Hopefully a comparison of the mainline and DaVinci trees will show

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