linux-kernel - Re: [FAIL bisect] Sound card probe error

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Date:   Mon, 14 May 2018 14:50:52 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Sylwester Nawrocki <s.nawrocki@...sung.com>
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Mark Brown <broonie@...nel.org>,
        Inki Dae <inki.dae@...sung.com>,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Andrzej Hajda <a.hajda@...sung.com>
Subject: Re: [FAIL bisect] Sound card probe error

On Mon, May 14, 2018 at 2:45 PM, Krzysztof Kozlowski <krzk@...nel.org> wrote:
> On Mon, May 14, 2018 at 2:40 PM, Sylwester Nawrocki
> <s.nawrocki@...sung.com> 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).\

Best regards,
Krzysztof