[pulseaudio-discuss] lots of retry on failure of hw_params interface

[jiwang]

Hi community

When doing development for Audio driver, I hit an interesting behaviour 
of pulseaudio

Due to some miss configurations in devicetree, my CPU DAI driver always 
fail on hw_params() interface,
when pulseaudio starts to configure driver for the first time, due to 
the problem in Driver configuration,
it fails on hw_params interface.
But instead of just exit from execution, (or just retry a few times)
pulseaudio continues to retry SNDRV_PCM_IOCTL_HW_PARAMS ioctl call,

with the following log message:
... ...
I: [pulseaudio] alsa-util.c: snd_pcm_hw_params failed: Invalid argument
I: [pulseaudio] alsa-util.c: Failed to set hardware parameters on 
plug:hw:0: Invalid argument
I: [pulseaudio] (alsa-lib)conf.c: Unknown parameters 0
I: [pulseaudio] (alsa-lib)pcm.c: Unknown PCM front:0
I: [pulseaudio] alsa-util.c: Error opening PCM device front:0: Invalid 
argument
I: [pulseaudio] (alsa-lib)pcm_hw.c: SNDRV_PCM_IOCTL_HW_PARAMS failed (-22)
I: [pulseaudio] (alsa-lib)pcm_hw.c: SNDRV_PCM_IOCTL_HW_PARAMS failed (-22)
I: [pulseaudio] (alsa-lib)pcm_hw.c: SNDRV_PCM_IOCTL_HW_PARAMS failed (-22)
I: [pulseaudio] (alsa-lib)pcm_hw.c: SNDRV_PCM_IOCTL_HW_PARAMS failed (-22)
I: [pulseaudio] (alsa-lib)pcm_hw.c: SNDRV_PCM_IOCTL_HW_PARAMS failed (-22)
I: [pulseaudio] alsa-util.c: snd_pcm_hw_params failed: Invalid argument
I: [pulseaudio] (alsa-lib)pcm_hw.c: SNDRV_PCM_IOCTL_HW_PARAMS failed (-22)
I: [pulseaudio] (alsa-lib)pcm_hw.c: SNDRV_PCM_IOCTL_HW_PARAMS failed (-22)
I: [pulseaudio] (alsa-lib)pcm_hw.c: SNDRV_PCM_IOCTL_HW_PARAMS failed (-22)
I: [pulseaudio] (alsa-lib)pcm_hw.c: SNDRV_PCM_IOCTL_HW_PARAMS failed (-22)
I: [pulseaudio] (alsa-lib)pcm_hw.c: SNDRV_PCM_IOCTL_HW_PARAMS failed (-22)
I: [pulseaudio] alsa-util.c: snd_pcm_hw_params failed: Invalid argument
I: [pulseaudio] (alsa-lib)pcm_hw.c: SNDRV_PCM_IOCTL_HW_PARAMS failed (-22)
I: [pulseaudio] (alsa-lib)pcm_hw.c: SNDRV_PCM_IOCTL_HW_PARAMS failed (-22)
I: [pulseaudio] (alsa-lib)pcm_hw.c: SNDRV_PCM_IOCTL_HW_PARAMS failed (-22)
I: [pulseaudio] (alsa-lib)pcm_hw.c: SNDRV_PCM_IOCTL_HW_PARAMS failed (-22)
I: [pulseaudio] (alsa-lib)pcm_hw.c: SNDRV_PCM_IOCTL_HW_PARAMS failed (-22)
... ...

as pulseaudio continues its retry of hw_params, it stops the whole system,
which doesn't make sense for me.

my question is:
is this behaviour default for pulseaudio?
can I change the retry number (for example, I want pulseaudio only retry 
a few times),
or can I disable the retry mechanism at all?



Thanks,
Jiada