[alsa-devel] cs46xx thinkpad resume fix - #bug1946

Pavel Kysilka pavelk at bsys.cz
Wed Jul 18 00:26:42 CEST 2007

On Tue Jul 17, 2007 at 12:50:21PM +0200, Takashi Iwai wrote:

  Hi Takashi,

good news below.

> At Mon, 16 Jul 2007 11:24:45 +0200,
> I wrote:
> > 
> > 
> > Oh, thanks for hunting this long-standing bug!
> > 
> > I think, however, it cannot be applied as it is.
> > First, snd_cs46xx_start_dsp() calls cs46xx_dsp_load_module(), and the
> > latter function isn't designed for the PM resume.  We'd need a special
> > resume function just for clearing area & reloading the dsp images
> > according to the already loaded DSP modules.
> > 
> > Second, __devinit prefix for snd_cs46xx_start_dsp() has to be removed
> > if it's called from the PM handler.
> Looking at the code more deeply, I suspect whether it really works
> when CONFIG_SND_CS46XX_NEW_DSP=y.  snd_cs46xx_start_dsp() involves
> with many calls that add SCBs and co, which will eventually overflow.
> I made a patch blindly to do the resume work in a saner way, but of
> course, it's totally untested.  Could you check whether it works?

Patch works perfectly.

Tested option:
- kernel compiled with and without CONFIG_SND_CS46XX_NEW_DSP=y
- play pcm stream, suspend, resume and pcm stream is playing
- play pcm stream, stop playing pcm stream, suspend, resume and play pcm stream

If you need log from resume from notebook, I'll send you this log.

> thanks,
> Takashi

 Many thanks

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