[alsa-devel] Bad PCM stream after a suspend/resume cycle

[Takashi Iwai]

On Thu, 11 Jan 2018 10:06:12 +0100,
Mirza Krak wrote:
> 
> Hi.
> 
> I have a quite simple problem really (simple test-case at least).
> 
> Following describes the test case:
> 
> $ aplay test.wav
> 
> # While the .wav is playing suspend the system
> $ systemctl suspend
> 
> # When system is resumed I get the following error on my aplay command
> aplay: pcm_write:2030: write error: File descriptor in bad state
> 
> I was expecting for the playback to resume.
> 
> I did some debugging using "aplay" and what I can see that happens
> before the EBADFD error is that the "writei_func()" returns a positive
> value once which results in a call to "snd_pcm_wait()" and on the next
> "writei_func()" call -EBADFD is returned.
> 
> I would expect a -ESTRPIPE error which should then result in that the
> PCM stream to be "resumed" (according to documentation at least). I
> have tried "forcing" a call to "suspend()" on the first write error in
> aplay after system is resumed and it actually works, kinda. The
> playback is resumed even-though the "snd_pcm_resume()" call returns an
> error.
> 
> I have not worked much with the sound subsystem before and I am having
> a hard time following all the call paths to see who/what is to blame
> for this behavior. Maybe it expected to work like this? And I do not
> know if this is only on my SoC or if this is a generic sound problem.

It's no generic issue but specific to platform / SoC driver
implementation.


Takashi

> Information about my system:
> 
> Using a RK3288 SoC (RK3288-FireFly board) with 4.14.13 Linux kernel
> (latest stable).
> 
> alsa-lib version 1.1.4.1
> 
> Playback using I2S
> 
> $ cat /proc/asound/cards
>  0 [I2S            ]: I2S - I2S
>                       I2S
> $ cat /proc/asound/card0/pcm0p/info
> card: 0
> device: 0
> subdevice: 0
> stream: PLAYBACK
> id: Audio es8328-hifi-analog-0
> name:
> subname: subdevice #0
> class: 0
> subclass: 0
> subdevices_count: 1
> subdevices_avail: 1
> 
> Let me know if there is additional information that I need to provide.
> 
> -- 
> Med Vänliga Hälsningar / Best Regards
> 
> Mirza Krak
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