[pulseaudio-tickets] [Bug 84585] Issue of CPU usage with HiFiBerry driver snd_soc_hifiberry_amp with Debian Wheezy kernel 3.12.28

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84585

--- Comment #27 from Alessandro Ferri <alessandroferri_015 at fastwebnet.it> ---
Dear Raymond,
the same failed error is present in both pulseaudio verbose log with Kernell
3.12.25 and 3.12.28, in the same situations. Do you think this is to create the
bug?

Kernel 3.12.25

1)
(   1.321|   0.001) I: [pulseaudio] (alsa-lib)pcm_hw.c:
SNDRV_PCM_IOCTL_HW_PARAMS failed (-22)
(   1.322|   0.001) D: [pulseaudio] alsa-util.c: Set buffer size first (to
88200 samples), period size second (to 88200 samples).
2)
(   9.113|   0.001) I: [alsa-sink] (alsa-lib)pcm_hw.c:
SNDRV_PCM_IOCTL_HW_PARAMS failed (-22)
(   9.115|   0.001) D: [alsa-sink] alsa-util.c: Set buffer size first (to 88200
samples), period size second (to 44100 samples).

Kernel 3.12.28
1)
(   1.217|   0.001) I: [pulseaudio] (alsa-lib)pcm_hw.c:
SNDRV_PCM_IOCTL_HW_PARAMS failed (-22)
(   1.219|   0.001) D: [pulseaudio] alsa-util.c: Set buffer size first (to
88200 samples), period size second (to 88200 samples).
2)
(   9.358|   0.001) I: [alsa-sink] (alsa-lib)pcm_hw.c:
SNDRV_PCM_IOCTL_HW_PARAMS failed (-22)
(   9.359|   0.001) D: [alsa-sink] alsa-util.c: Set buffer size first (to 88200
samples), period size second (to 44100 samples).




(In reply to Raymond from comment #26)
> (alsa-lib)pcm_hw.c: SNDRV_PCM_IOCTL_HW_PARAMS failed (-22)
> 
> 
> 
> do the driver has enough constraints to finalize the parameters when
> pulseaudio only set maximum buffer size? 
> 
> 
> do this mean it support Non integer (e.g.3.7 ) periods per buffer since
> there is no constraint 
> 
> snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
> 
> http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/src/modules/alsa/
> alsa-util.c?id=3c73e2130fd65e147c487b0b84c1a8b6a8afa04c

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