Re: [PATCH v2 11/48] opp: Add dev_pm_opp_find_level_ceil()

[Dmitry Osipenko]

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@xxxxxxxxx>
>>>
>>> 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().