linux-kernel - Re: [PATCH 22/31] soc/tegra: Migrate to dev_pm_opp_set

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Message-ID: <f2acd51e-24f6-aa84-cfd4-372dd5e30aa0@nvidia.com>
Date:   Wed, 29 Jun 2022 18:03:00 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Dmitry Osipenko <dmitry.osipenko@...labora.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Rafael Wysocki <rjw@...ysocki.net>,
        Stephen Boyd <sboyd@...nel.org>, Nishanth Menon <nm@...com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 22/31] soc/tegra: Migrate to dev_pm_opp_set_config()


On 28/06/2022 11:08, Dmitry Osipenko wrote:
> On 6/28/22 10:09, Viresh Kumar wrote:
>> On 27-06-22, 12:51, Viresh Kumar wrote:
>>> On 27-06-22, 10:14, Dmitry Osipenko wrote:
>>>> 27.06.2022 09:45, Viresh Kumar пишет:
>>>>>> Looks okay. If you'll solve the cpufreq problem where OPP config is set
>>>>>> by two drivers for the same cpu device
>>>>> This is supported, there is some early freeing of resources on the
>>>>> removal path though, the reasoning for which I already gave in another
>>>>> email. Though, I am open to sorting that out as well, but nothing
>>>>> breaks the code for now AFAICT.
>>>>>
>>>>
>>>> In case of Tegra, we use tegra-cpufreq driver that sets supported_hw and
>>>> registers cpufreq-dt. If cpufreq-dt driver defers the probe, then the
>>>> supported_hw will be lost on the re-probe. I haven't checked yet, but I
>>>> suppose that cpufreq-dt driver defers on Tegra30 because of the CPU
>>>> regulator and that's why we get the "OPP table is missing" error.
>>>
>>> Aha, I get it now. I see, this is a real problem. Will fix it. Give me
>>> some time to think. Thanks.
>>
>> Okay, I fixed this in opp/linux-next, can you or Jon please give it a
>> go on tegra30 to see if the issue is fixed ?
>>
>> FWIW, I have fixed this with the IDR API and the OPP core will only
>> free the resources in clear-config, that the corresponding set-config
>> has configured. I have tested it with the clk API only though.
>>
>> Once you confirm, I will resend all the patches and hope no issues are
>> left here.
>>
>> Thanks for helping out guys. Really appreciate it.
>>
> 
> The opp/linux-next works fine, thank you.
> 
> Tested-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>


Today's -next is also working fine for me too!

Thanks
Jon

-- 
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