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

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Date:   Mon, 14 May 2018 14:36:21 +0200
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.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

Hi Krzysztof,

On 2018-05-14 14:29, Krzysztof Kozlowski wrote:
> On Mon, May 14, 2018 at 2:22 PM, Sylwester Nawrocki
> <s.nawrocki@...sung.com> wrote:
>> Hi,
>>
>> On 05/14/2018 12:17 PM, Krzysztof Kozlowski wrote:
>>
>>> Bisected to:
>>> 8c123c14bbba4add148536b6d47a9226deda2f7a is the first bad commit
>>> commit 8c123c14bbba4add148536b6d47a9226deda2f7a
>>> Author: Ulf Hansson <ulf.hansson@...aro.org>
>>> Date:   Thu Apr 26 10:53:06 2018 +0200
>>>
>>>      driver core: Respect all error codes from dev_pm_domain_attach()
>>>
>>>      The limitation of being able to check only for -EPROBE_DEFER from
>>>      dev_pm_domain_attach() has been removed. Hence let's respect all error
>>>      codes and bail out accordingly.
>>>
>>>      Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
>>>      Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>>>      Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>> The DRM driver creates the HDMI codec but its registration fails, due
>> to some missing clocks. The clock are missing because the exynos5-subcmu
>> driver probing fails.
>>
>> [    0.678578] exynos5-subcmu: probe of GSC failed with error -17
>> [    0.679250] exynos5-subcmu: probe of MFC failed with error -17
>> [    0.679992] exynos5-subcmu: probe of DISP failed with error -17
>>
>> The exynos5-subcmu driver before registering platform device makes
>> of_genpd_add_device() call, so in platform_drv_probe() dev_pm_domain_attach()
>> call will fail, as dev->pm_domain is already set. Previously the error
>> was masked by code removed in the above commit and platform_drv_probe()
>> was could complete successfully.
> Thanks Sylwester!
>
> 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?

Odroid XU3 sound card driver is waiting for HDMI codec, which is being 
created
by Exynos DRM HDMI driver, which was deferred by lack of clocks.

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland