linux-kernel - Re: Probe HD-audio devices in parallel (was: azx

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Date:   Wed, 25 Apr 2018 15:42:32 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Paul Menzel <pmenzel+alsa-devel@...gen.mpg.de>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: Probe HD-audio devices in parallel (was: azx_probe() called twice)

On Wed, 25 Apr 2018 14:38:36 +0200,
Paul Menzel wrote:
> 
> Dear Takashi,
> 
> 
> On 04/25/18 14:34, Takashi Iwai wrote:
> > On Wed, 25 Apr 2018 14:29:31 +0200, Paul Menzel wrote:
> 
> >> On 04/25/18 13:58, Takashi Iwai wrote:
> >>> On Wed, 25 Apr 2018 13:48:27 +0200, Paul Menzel wrote:
> >>
> >>>> With the attached debug patch, `azx_probe()` seems to have been called
> >>>> twice on the ASRock E350M1. Is that expected? It also differs, that
> >>>> it’s only called once during some boots, and twice during others.
> >>>
> >>> How many HD-audio devices does it have?
> >>
> >> I’d say one (ALC892), but how do I verify that?
> >
> > I meant HD-audio controllers.
> >
> >> Please find lspci and Linux logs attached from an older boot with Linux 4.11.
> > ....
> >> 00:01.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Wrestler HDMI Audio
> > ....
> >> 00:14.2 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] SBx00 Azalia (Intel HDA) (rev 40)
> >
> > So you have two HD-audio controllers (one for HDMI/DP and another for
> > Realtek codec).  It's expected behavior that azx_probe() gets called
> > twice.
> 
> True. Too many log files I looked at lately, and I got confused. Sorry
> for the noise.
> 
> Could the probe theoretically be done in parallel?

I guess you can pass snd_hda_intel.async_probe boot option.


Takashi