about ARM11 WM9715 no sound when resume

about ARM11 WM9715 no sound when resume

[tommy]

Hi,all!

Platform:Linux 2.6.24.2
MCU:Samsung ARM11
Codec:WM9715 AC97

Problem:
              When MCU resume from suspend,no sound but can also
playback from start to end!
               It has sound only by modifing sound setting applicantion
program!
               I see ubuntu alsa resume,it is use alsa-force(reloading
alsa driver to fix that problem),is that only way to fix that issue in
ARM too?
               My driver is built-in!
               I try to write volume reg to codec when resume,also the
same problem!
               
Thanks first!

Tommy at China

about ARM11 WM9715 no sound when resume

[Mark Brown]

On Thu, Oct 22, 2009 at 10:58:09AM +0800, tommy wrote:
> Platform:Linux 2.6.24.2

This is a very old kernel, I would strongly recommend upgrading to
something more current, it will make it much easier for you to seek
upstream support.

>               When MCU resume from suspend,no sound but can also
> playback from start to end!
>                It has sound only by modifing sound setting applicantion
> program!

The wm971x ASoC drivers have suspend and resume support which is fairly
widely used on a number of platforms.  However, there may be problems
with the CPU drivers.  As a first step I would suggest checking to make
sure that the master clock to the CODEC is restarted after resume and
that the AC97 link is succesfully restarted.

about ARM11 WM9715 no sound when resume

[tommy]

hi,brown!
It can playback mp3 from start to end,also can't indicate its clock is
ok ?

On ?, 2009-10-22 at 11:39 +0100, Mark Brown wrote:
> On Thu, Oct 22, 2009 at 10:58:09AM +0800, tommy wrote:
> > Platform:Linux 2.6.24.2
> 
> This is a very old kernel, I would strongly recommend upgrading to
> something more current, it will make it much easier for you to seek
> upstream support.
> 
> >               When MCU resume from suspend,no sound but can also
> > playback from start to end!
> >                It has sound only by modifing sound setting applicantion
> > program!
> 
> The wm971x ASoC drivers have suspend and resume support which is fairly
> widely used on a number of platforms.  However, there may be problems
> with the CPU drivers.  As a first step I would suggest checking to make
> sure that the master clock to the CODEC is restarted after resume and
> that the AC97 link is succesfully restarted.
> 

about ARM11 WM9715 no sound when resume

[Mark Brown]

On Thu, Oct 22, 2009 at 06:45:22PM +0800, tommy wrote:

Please don't top post, it breaks the flow of discussion.

> hi,brown!
> It can playback mp3 from start to end,also can't indicate its clock is
> ok ?

To check the clock you should use an oscilloscope to make sure that the
clock is present and running at the expected rate.

I'm not sure what you mean about MP3 playback?