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Subject: Re: [PATCH v2 1/2] i2c: tegra: Better handle case where CPU0 is busy
 for a long time
To:     Dmitry Osipenko <digetx@gmail.com>,
        Thierry Reding <thierry.reding@gmail.com>,
        Laxman Dewangan <ldewangan@nvidia.com>,
        "Wolfram Sang" <wsa@the-dreams.de>,
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From:   Jon Hunter <jonathanh@nvidia.com>
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Date:   Tue, 21 Apr 2020 20:42:40 +0100
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On 21/04/2020 16:08, Dmitry Osipenko wrote:
> 21.04.2020 17:40, Jon Hunter =D0=BF=D0=B8=D1=88=D0=B5=D1=82:
>>
>> On 21/04/2020 14:25, Dmitry Osipenko wrote:
>>> 21.04.2020 12:49, Jon Hunter =D0=BF=D0=B8=D1=88=D0=B5=D1=82:
>>> ...
>>>> I can try the above, but I agree it would be best to avoid messing wit=
h
>>>> the suspend levels if possible.
>>>
>>> Will be awesome if you could try it and report back the result.
>>>
>>
>> I gave it a try but suspend still fails.
>=20
> Perhaps the RPM's -EACCES is returned from here:
>=20
> https://elixir.free-electrons.com/linux/v5.7-rc2/source/drivers/base/powe=
r/runtime.c#L723
>=20
> Which suggests that I2C is accessed after being suspended. I guess the
> PCIe driver suspends after the I2C and somehow my change affected the
> suspension order, although not sure how.
>=20
> Jon, could you please try to enable PM logging and post the log? Please
> also post log of the working kernel version, so that we could compare
> the PM sequence.
>=20
> Something like this should enable the logging: "echo 1 >
> /sys/power/pm_trace" + there is RPM tracing.

Unfortunately, after enabling that I don't any output and so no help there.

Jon

--=20
nvpublic