linux-kernel - Re: [PATCH V2 0/3] OPP: Simplify required-opp handling

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Date:   Fri, 3 Nov 2023 10:24:08 +0100
From:   Stephan Gerhold <stephan@...hold.net>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Nishanth Menon <nm@...com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Viresh Kumar <vireshk@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Stephan Gerhold <stephan.gerhold@...nkonzept.com>,
        linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 0/3] OPP: Simplify required-opp handling

On Fri, Nov 03, 2023 at 10:58:54AM +0530, Viresh Kumar wrote:
> On 30-10-23, 15:54, Viresh Kumar wrote:
> > I wasn't able to test this locally (despite trying to hack it around) and need
> > help from someone who is `virt_devs` field of `struct dev_pm_opp_config`.
> > 
> > Pushed here:
> > 
> > git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm.git opp/required-opps
> > 
> > V1->V2:
> > - Support opp-level 0, drop vote i.e..
> > - Fix OPP pointer while calling dev_pm_opp_set_opp() recursively.
> > - Minor checks and fixes.
> > - Add Reviewed-by from Ulf.
> 
> Stephan, Ulf,
> 
> Any feedback on this before I merge it ?
> 

Sorry for the delay. I tested this successfully on the MSM8909 board on
Wednesday (with the single genpd, and without opp-level 0 there), but
until now didn't find time to test it on the MSM8916 board with the
multiple genpds and the opp-level 0.

The opp-level 0 works fine now, thanks for fixing that!

The warning in _link_required_opps() when using the parent genpd setup
[1] is still present though. Given that this setup is an existing
feature in the genpd core I would appreciate if we try to find a
solution before merging this patch set. It's kind of a regression
otherwise since the warning isn't present without this patch set.
Maybe someone else is already actively using such a setup.

Thanks!
Stephan

[1]: https://lore.kernel.org/linux-pm/ZTkciw5AwufxQYnB@gerhold.net/