From: Quentin Perret <qperret@google•com>
To: Lukasz Luba <lukasz.luba@arm•com>
Cc: nm@ti•com, juri.lelli@redhat•com, daniel.lezcano@linaro•org,
peterz@infradead•org, viresh.kumar@linaro•org,
dri-devel@lists•freedesktop.org, bjorn.andersson@linaro•org,
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agross@kernel•org, b.zolnierkie@samsung•com,
steven.price@arm•com, cw00.choi@samsung•com, mingo@redhat•com,
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mgorman@suse•de, daniel@ffwll•ch, linux-pm@vger•kernel.org,
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rostedt@goodmis•org, linux-mediatek@lists•infradead.org,
matthias.bgg@gmail•com, Chris.Redpath@arm•com,
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sudeep.holla@arm•com, ionela.voinescu@arm•com
Subject: Re: [PATCH 1/4] PM / EM: and devices to Energy Model
Date: Mon, 20 Jan 2020 15:09:18 +0000 [thread overview]
Message-ID: <20200120150918.GA164543@google.com> (raw)
In-Reply-To: <40587d98-0e8d-cbac-dbf5-d26501d47a8c@arm.com>
Hey Lukasz,
On Monday 20 Jan 2020 at 14:52:07 (+0000), Lukasz Luba wrote:
> On 1/17/20 10:54 AM, Quentin Perret wrote:
> > Suggested alternative: have two registration functions like so:
> >
> > int em_register_dev_pd(struct device *dev, unsigned int nr_states,
> > struct em_data_callback *cb);
> > int em_register_cpu_pd(cpumask_t *span, unsigned int nr_states,
> > struct em_data_callback *cb);
>
> Interesting, in the internal review Dietmar asked me to remove these two
> functions. I had the same idea, which would simplify a bit the
> registration and it does not need to check the dev->bus if it is CPU.
>
> Unfortunately, we would need also two function in drivers/opp/of.c:
> dev_pm_opp_of_register_cpu_em(policy->cpus);
> and
> dev_pm_opp_of_register_dev_em(dev);
>
> Thus, I have created only one registration function, which you can see
> in this patch set.
Right, I can see how having a unified API would be appealing, but the
OPP dependency is a nono, so we'll need to work around one way or
another.
FWIW, I don't think having separate APIs for CPUs and other devices is
that bad given that we already have entirely different frameworks to
drive their respective frequencies. And the _cpu variants are basically
just wrappers around the _dev ones, so not too bad either IMO :).
Thanks,
Quentin
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next prev parent reply other threads:[~2020-01-20 15:09 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-16 15:20 [PATCH 0/4] Add support for devices in the Energy Model lukasz.luba
2020-01-16 15:20 ` [PATCH 1/4] PM / EM: and devices to " lukasz.luba
2020-01-17 10:54 ` Quentin Perret
2020-01-20 14:52 ` Lukasz Luba
2020-01-20 15:09 ` Quentin Perret [this message]
2020-01-20 18:27 ` Dietmar Eggemann
2020-01-20 18:38 ` Lukasz Luba
2020-01-21 9:10 ` Dietmar Eggemann
2020-01-21 9:37 ` Quentin Perret
2020-01-21 9:31 ` Quentin Perret
2020-01-20 14:53 ` Dietmar Eggemann
2020-01-20 15:11 ` Dietmar Eggemann
2020-01-20 15:36 ` Lukasz Luba
2020-01-20 15:27 ` Lukasz Luba
2020-01-20 15:28 ` Quentin Perret
2020-01-20 16:20 ` Lukasz Luba
2020-01-21 10:08 ` Quentin Perret
2020-01-21 10:49 ` Lukasz Luba
2020-01-16 15:20 ` [PATCH 2/4] OPP: change parameter to device pointer in dev_pm_opp_of_register_em() lukasz.luba
2020-01-16 15:20 ` [PATCH 3/4] thermal: devfreq_cooling: Refactor code and switch to use Energy Model lukasz.luba
2020-01-21 17:11 ` Steven Rostedt
2020-01-22 9:35 ` Lukasz Luba
2020-01-16 15:20 ` [PATCH 4/4] drm/panfrost: Register to the Energy Model with devfreq device lukasz.luba
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