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From:   Krzysztof Kozlowski <krzk@kernel.org>
Date:   Mon, 14 May 2018 14:43:09 +0200
Message-ID: <CAJKOXPcTQX82UdcBROBc18C-M0_3bOnStLqJzUzRDqHC33m-1g@mail.gmail.com>
Subject: Re: [FAIL bisect] Sound card probe error
To:     Ulf Hansson <ulf.hansson@linaro.org>
Cc:     Sylwester Nawrocki <s.nawrocki@samsung.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Mark Brown <broonie@kernel.org>,
        Inki Dae <inki.dae@samsung.com>,
        "linux-samsung-soc@vger.kernel.org" 
        <linux-samsung-soc@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        Andrzej Hajda <a.hajda@samsung.com>
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On Mon, May 14, 2018 at 2:30 PM, Ulf Hansson <ulf.hansson@linaro.org> wrote:
> On 14 May 2018 at 14:22, Sylwester Nawrocki <s.nawrocki@samsung.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@linaro.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@linaro.org>
>>>     Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>>>     Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.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 for providing this information!
>
> I was about to tell that I overlooked the fact that there is more than
> one way to assign PM domain pointers to devices. To fix the problem,
> dev_pm_domain_attach() should return 0, not -EEXIST when it finds and
> existing PM domain pointer.
>
> Does the below patch fix the problem?
>
> From: Ulf Hansson <ulf.hansson@linaro.org>
> Date: Mon, 14 May 2018 14:26:16 +0200
> Subject: [PATCH] PM / Domains: Don't return -EEXIST at attach when PM domain
>  exists
>
> As dev_pm_domain_attach() isn't the only way to assign PM domain pointers
> to devices, clearly we must allow a device to have the pointer already
> being assigned. For this reason, return 0 instead of -EEXIST.
>
> Reported-by: Krzysztof Kozlowski <krzk@kernel.org>
> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
> ---
>  drivers/base/power/common.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)


Yes, this fixes the issue.
Tested-by: Krzysztof Kozlowski <krzk@kernel.org>

Best regards,
Krzysztof