ice1712, snd_pcm_mmap_readi(), POLLERR in poll_revents

ice1712, snd_pcm_mmap_readi(), POLLERR in poll_revents

[Peter Vollmer]

Hi all,

I am still trying to get the ice1712-based soundcard to work on an embedded 
platform, using alsa driver/lib 0.9.3
While capturing works for hw:0,0 (multitrack mode) using snd_pcm_readi(), I 
get an -EIO when capturing with snd_pcm_mmap_readi(), immediatly after the 
buffer is filled up with 4 periods.
I tracked the problem down to the snd_read_areas() function, where 
snd_pcm_wait(pcm,-1) returns -EIO (detection of POLLERR in revents), 
waiting for the soundcard to become ready.

Do you have any idea where to start debugging in the driver from this point ?

Thanks for your help,

Peter



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Re: ice1712, snd_pcm_mmap_readi(), POLLERR in poll_revents

[Takashi Iwai]

At Fri, 16 May 2003 16:03:48 +0200,
Peter Vollmer wrote:
> 
> Hi all,
> 
> I am still trying to get the ice1712-based soundcard to work on an embedded 
> platform, using alsa driver/lib 0.9.3
> While capturing works for hw:0,0 (multitrack mode) using snd_pcm_readi(), I 
> get an -EIO when capturing with snd_pcm_mmap_readi(), immediatly after the 
> buffer is filled up with 4 periods.
> I tracked the problem down to the snd_read_areas() function, where 
> snd_pcm_wait(pcm,-1) returns -EIO (detection of POLLERR in revents), 
> waiting for the soundcard to become ready.

at first you should check in which state the pcm stream is when poll()
returns the error.  alsa-lib code checks the normal errors (XRUN and
SUSPENDED) but the other status are handled as it is.


ciao,

Takashi


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Re: ice1712, snd_pcm_mmap_readi(), POLLERR in poll_revents

[Peter Vollmer]

At 17:04 16.5.2003 +0200, Takashi Iwai wrote:
>At Fri, 16 May 2003 16:03:48 +0200,
>Peter Vollmer wrote:
> >
> > Hi all,
> >
> > I am still trying to get the ice1712-based soundcard to work on an 
> embedded
> > platform, using alsa driver/lib 0.9.3
> > While capturing works for hw:0,0 (multitrack mode) using 
> snd_pcm_readi(), I
> > get an -EIO when capturing with snd_pcm_mmap_readi(), immediatly after the
> > buffer is filled up with 4 periods.
> > I tracked the problem down to the snd_read_areas() function, where
> > snd_pcm_wait(pcm,-1) returns -EIO (detection of POLLERR in revents),
> > waiting for the soundcard to become ready.
>
>at first you should check in which state the pcm stream is when poll()
>returns the error.  alsa-lib code checks the normal errors (XRUN and
>SUSPENDED) but the other status are handled as it is.

I checked this in the driver. Somehow the stream returned to OPEN state.
In snd_pcm_capture_poll() the default case is applied. But the driver
seems not to cause this, I checked all occurences of SNDRV_PCM_STATE_OPEN
(in snd_pcm_open_substream(), snd_pcm_hw_params() and snd_pcm_hw_free().
If the state is only set  using the enums SNDDRV_PCM_STATE_... , I guess I
have a problem somewhere else.

Peter



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The only event dedicated to issues related to Linux enterprise solutions
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