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SubjectRe: [PATCH 2/7] cpufreq: dt: Register an Energy Model
On Tuesday 29 Jan 2019 at 11:00:41 (+0530), Viresh Kumar wrote:
> On 28-01-19, 16:55, Quentin Perret wrote:
> > Now that PM_OPP provides a helper function to estimate the power
> > consumed by CPUs, make sure to try and register an Energy Model (EM)
> > from cpufreq-dt, hence ensuring interested subsystems (the task
> > scheduler, for example) can make use of that information when available.
> >
> > Signed-off-by: Quentin Perret <quentin.perret@arm.com>
> > ---
> > drivers/cpufreq/cpufreq-dt.c | 7 ++++++-
> > 1 file changed, 6 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
> > index e58bfcb1169e..7556e07e7a9f 100644
> > --- a/drivers/cpufreq/cpufreq-dt.c
> > +++ b/drivers/cpufreq/cpufreq-dt.c
> > @@ -16,6 +16,7 @@
> > #include <linux/cpu_cooling.h>
> > #include <linux/cpufreq.h>
> > #include <linux/cpumask.h>
> > +#include <linux/energy_model.h>
> > #include <linux/err.h>
> > #include <linux/module.h>
> > #include <linux/of.h>
> > @@ -152,6 +153,7 @@ static int resources_available(void)
> >
> > static int cpufreq_init(struct cpufreq_policy *policy)
> > {
> > + struct em_data_callback em_cb = EM_DATA_CB(of_dev_pm_opp_get_cpu_power);
>
> Hmm, so all the earlier comments regarding prototype of this routine are invalid
> because of this.

Right.

>
> > struct cpufreq_frequency_table *freq_table;
> > struct opp_table *opp_table = NULL;
> > struct private_data *priv;
> > @@ -160,7 +162,7 @@ static int cpufreq_init(struct cpufreq_policy *policy)
> > unsigned int transition_latency;
> > bool fallback = false;
> > const char *name;
> > - int ret;
> > + int ret, nr_opp;
> >
> > cpu_dev = get_cpu_device(policy->cpu);
> > if (!cpu_dev) {
> > @@ -237,6 +239,7 @@ static int cpufreq_init(struct cpufreq_policy *policy)
> > ret = -EPROBE_DEFER;
> > goto out_free_opp;
> > }
> > + nr_opp = ret;
>
> Instead use nr_opp instead of ret while calling dev_pm_opp_get_opp_count().

Will do.

>
> >
> > if (fallback) {
> > cpumask_setall(policy->cpus);
> > @@ -280,6 +283,8 @@ static int cpufreq_init(struct cpufreq_policy *policy)
> > policy->cpuinfo.transition_latency = transition_latency;
> > policy->dvfs_possible_from_any_cpu = true;
> >
> > + em_register_perf_domain(policy->cpus, nr_opp, &em_cb);
> > +
> > return 0;
> >
> > out_free_cpufreq_table:
> > --
> > 2.20.1
>
> --
> viresh

Thanks,
Quentin

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