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

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Date:   Wed, 13 Feb 2019 16:56:32 +0100
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: snd_hda_codec_hdmi: `hdaudio hdaudioC0D2: Unable to bind the codec`

On Wed, 13 Feb 2019 16:42:19 +0100,
Paul Menzel wrote:
> 
> Dear Takashi,
> 
> 
> 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.
> 
> Can this be enforced by the Kconfig configuration?

This is the restriction only needed if i915 HDMI audio is used, so you
can't stop the configuration statically.  Your setup would still work
except for HDMI, for example.

> If not, should the
> warning/error message be extended with this hint?

Possible, but why such a weird configuration at the first place...?


Takashi