Re: [FAIL bisect] Sound card probe error

From: Sylwester Nawrocki
Date: Mon May 14 2018 - 09:35:41 EST

On 05/14/2018 02:50 PM, Krzysztof Kozlowski wrote:
> On Mon, May 14, 2018 at 2:45 PM, Krzysztof Kozlowski <krzk@xxxxxxxxxx> wrote:
>> On Mon, May 14, 2018 at 2:40 PM, Sylwester Nawrocki
>> <s.nawrocki@xxxxxxxxxxx> wrote:
>>> On 05/14/2018 02:29 PM, Krzysztof Kozlowski wrote:
>>>> Ah, I missed these messages because I was looking at err dmesg level
>>>> (and for some reason these are warn). Anyway do you have any thoughts
>>>> how is it connected with missing Odroid XU3 sound card and max98090
>>>> codec?
>>> One reason is that the DRM driver registers an ASoC codec object which
>>> is required for the sound card registration to complete. But I wonder
>>> why there is no any error messages related to this.
>> Thanks Marek and Sylwester. Another point is that probably OOPS later
>> should not happen...

> Separate topic (trim Cc list):
> ... and this means that disabling Exynos DRM causes lack of Audio. I
> tried it now and indeed without DRM there is no audio again. I think
> it is not nice... There are not many such use cases but there are
> (playing audio from console/ssh with a headless board).\

As we discussed off the mailing list, what we could probably do now
is to add a compile time dependency on CONFIG_DRM_EXYNOS_HDMI, a fallback
to the max98098 codec only when the HDMI driver is disabled.

That might require modifying snd_soc_of_get_dai_link_codecs() so it can
skip optional codecs.