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

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Message-ID: <7ab0d5ea-0228-6081-1598-db4904cb99c8@molgen.mpg.de>
Date:   Wed, 25 Apr 2018 14:38:36 +0200
From:   Paul Menzel <pmenzel+alsa-devel@...gen.mpg.de>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Probe HD-audio devices in parallel (was: azx_probe() called twice)

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?


Kind regards,

Paul


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