[PATCH 2/7] cpufreq: dt: Register an Energy Model
From: Quentin Perret <hidden>
Date: 2019-01-28 16:56:25
Also in:
linux-devicetree, linux-pm, lkml
Subsystem:
cpu frequency scaling framework, the rest · Maintainers:
"Rafael J. Wysocki", Viresh Kumar, Linus Torvalds
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 <redacted> --- 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); 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; 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
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