Re: [RFC PATCH 4/9] opp: core: Don't warn if required OPP device does not exist

[Hector Martin "marcan"]

On 2021年10月12日 18:26:03 JST, Viresh Kumar <viresh.kumar at linaro.org> wrote:
>On 12-10-21, 14:57, Hector Martin wrote:
>> 
>> This is arguably not entirely representative of how the hardware works,
>> since technically the cluster switching couldn't care less what the memory
>> controller is doing; it's a soft dependency, states that should be switched
>> together but are not interdependent (in fact, the clock code does this
>> unconditionally after the CPU p-state change, regardless of whether we're
>> shifting up or down; this is, FWIW, the same order macOS uses, and it
>> clearly doesn't matter which way you do it).
>
>Yeah, I understand what you are doing. But the current patch is
>incorrect in the sense that it can cause a bug on other platforms. To
>make this work, you should rather set this genpd as parent of CPU
>devices (which are doing anyway since you are updating them with CPU's
>DVFS). With that the clk driver won't be required to do the magic
>behind the scene.
>

That doesn't work, though, because the CPUs aren't normal devices with runtime-pm. That was the first thing I tried :).

If you think this *should* be made to work instead then I can try that.


-- 
Hector Martin "marcan" (marcan at marcan.st)
Public key: https://mrcn.st/pub