linux-kernel - Re: snd_hda_codec_hdmi: `hdaudio hdaudioC0D2: Unable to bind the codec`

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Date:   Mon, 18 Feb 2019 16:17:30 +0100
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: Re: snd_hda_codec_hdmi: `hdaudio hdaudioC0D2: Unable to bind the
 codec`

Dear Takashi,


On 02/14/19 17:06, Takashi Iwai wrote:
> On Thu, 14 Feb 2019 17:00:29 +0100, Paul Menzel wrote:

>> On 02/13/19 16:56, Takashi Iwai wrote:
>>> On Wed, 13 Feb 2019 16:42:19 +0100, Paul Menzel wrote:
>>
>>>> On 02/13/19 16:12, Takashi Iwai wrote:
>>>>> On Wed, 13 Feb 2019 15:58:44 +0100, Paul Menzel wrote:
>>>>>>
>>>>>>> Why the i915 driver gets initialized *so late*?
>>>>>>
>>>>>> Maybe, because it’s built as a module?
>>>>>>
>>>>>> ```
>>>>>> $ grep I915 /boot/config-4.20.8.mx64.245 
>>>>>> CONFIG_DRM_I915=m
>>>>>> # CONFIG_DRM_I915_ALPHA_SUPPORT is not set
>>>>>> CONFIG_DRM_I915_CAPTURE_ERROR=y
>>>>>> CONFIG_DRM_I915_COMPRESS_ERROR=y
>>>>>> CONFIG_DRM_I915_USERPTR=y
>>>>>> # CONFIG_DRM_I915_GVT is not set
>>>>>> CONFIG_SND_HDA_I915=y
>>>>>> ```
>>>>>
>>>>> That explains.  You built the HD-audio as built-in while the graphics
>>>>> as module.  This makes the binding impossible at the time of sound
>>>>> driver initialization.
>>>>>
>>>>> If you build the graphics driver as a module, built the sound driver
>>>>> also as a module.
>>
>> I tried that now, but `SND_HDA_I915` is just a boolean and no tristate.
>>
>>     config SND_HDA_I915
>>             bool
>>             select SND_HDA_COMPONENT
> 
> It's not user-choosable in anyway.

Yes, but I read your answer the way, that it could be selected as a
module. (Or did not see, how you knew from looking at the pasted config
options.)

>> Then, I built the HDA subsystem as a module, but that also did not help.
>> The DRM subsystem is started after the HD-audio subsystem.
>>
>> ```
>> $ grep -e SND_HDA= -e SND_HDA_INTEL /boot/config-4.20.8.mx64.245 
>> CONFIG_SND_HDA=m
>> CONFIG_SND_HDA_INTEL=m
> 
> That's odd.  In sound/hda/hdac_i915.c there is an explicit
> request_module("i915"), and at that point, it has a 10 second
> timeout.  If this isn't enough, try to raise the number, e.g. 60
> seconds.

I tried as you suggested, and increased it to 60 seconds.

    sed -i 's/msecs_to_jiffies(10 * 1000))/msecs_to_jiffies(60 * 1000))/' sound/hda/hdac_i915.c

That seems to have fixed it.

```
$ grep _hda_ 20190218–linux_4.20.10–dmesg.txt
[   15.568061] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
[   15.706898] snd_hda_codec_realtek hdaudioC0D0: autoconfig for ALC671: line_outs=1 (0x21/0x0/0x0/0x0/0x0) type:line
[   15.708754] snd_hda_codec_realtek hdaudioC0D0:    speaker_outs=1 (0x17/0x0/0x0/0x0/0x0)
[   15.710249] snd_hda_codec_realtek hdaudioC0D0:    hp_outs=1 (0x14/0x0/0x0/0x0/0x0)
[   15.712031] snd_hda_codec_realtek hdaudioC0D0:    mono: mono_out=0x0
[   15.712348] snd_hda_codec_realtek hdaudioC0D0:    inputs:
[   15.712619] snd_hda_codec_realtek hdaudioC0D0:      Front Mic=0x19
[   15.712929] snd_hda_codec_realtek hdaudioC0D0:      Rear Mic=0x18
[   15.713234] snd_hda_codec_realtek hdaudioC0D0:      Line=0x1a
```

So the time-out, needs to be increased.


Kind regards,

Paul

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