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Subject: Re: [PATCH v2 11/48] opp: Add dev_pm_opp_find_level_ceil()
To:     Viresh Kumar <viresh.kumar@linaro.org>
Cc:     Thierry Reding <thierry.reding@gmail.com>,
        Jonathan Hunter <jonathanh@nvidia.com>,
        Mark Brown <broonie@kernel.org>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Peter Geis <pgwipeout@gmail.com>,
        Nicolas Chauvet <kwizart@gmail.com>,
        Krzysztof Kozlowski <krzk@kernel.org>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Kevin Hilman <khilman@kernel.org>,
        Peter De Schrijver <pdeschrijver@nvidia.com>,
        Viresh Kumar <vireshk@kernel.org>,
        Stephen Boyd <sboyd@kernel.org>,
        Michael Turquette <mturquette@baylibre.com>,
        devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org,
        devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org,
        linux-media@vger.kernel.org, linux-tegra@vger.kernel.org,
        linux-clk@vger.kernel.org
References: <20201217180638.22748-1-digetx@gmail.com>
 <20201217180638.22748-12-digetx@gmail.com>
 <20201222064253.x7vsurh7q5k7qzb5@vireshk-i7>
 <fd7b9f42-d0a7-45eb-2a17-d46779011c58@gmail.com>
 <20201223041931.klnppy4fu3sdgtsz@vireshk-i7>
From:   Dmitry Osipenko <digetx@gmail.com>
Message-ID: <f00e0c74-8d9a-d3d3-81bb-3ac25a74175d@gmail.com>
Date:   Wed, 23 Dec 2020 23:37:47 +0300
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23.12.2020 07:19, Viresh Kumar пишет:
> On 22-12-20, 22:15, Dmitry Osipenko wrote:
>> 22.12.2020 09:42, Viresh Kumar пишет:
>>> On 17-12-20, 21:06, Dmitry Osipenko wrote:
>>>> Add a ceil version of the dev_pm_opp_find_level(). It's handy to have if
>>>> levels don't start from 0 in OPP table and zero usually means a minimal
>>>> level.
>>>>
>>>> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
>>>
>>> Why doesn't the exact version work for you here ?
>>>
>>
>> The exact version won't find OPP for level=0 if levels don't start with
>> 0, where 0 means that minimal level is desired.
> 
> Right, but why do you need to send 0 for your platform ?
> 

To put power domain into the lowest performance state when device is idling.

https://elixir.bootlin.com/linux/v5.10-rc2/source/drivers/opp/core.c#L897

https://elixir.bootlin.com/linux/v5.10-rc2/source/drivers/opp/core.c#L785

Also please see patch 32, tegra_clock_runtime_suspend().