[PATCH 4/7] cpufreq: arm_big_little: Register an Energy Model
From: Quentin Perret <hidden>
Date: 2019-01-28 16:56:14
Also in:
linux-devicetree, linux-pm, lkml
Subsystem:
cpu frequency scaling framework, the rest · Maintainers:
"Rafael J. Wysocki", Viresh Kumar, Linus Torvalds
From: Dietmar Eggemann <dietmar.eggemann@arm.com> 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 the arm_big_little CPUFreq driver, hence ensuring interested subsystems (the task scheduler, for example) can make use of that information when available. Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Signed-off-by: Quentin Perret <redacted> --- drivers/cpufreq/arm_big_little.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/drivers/cpufreq/arm_big_little.c b/drivers/cpufreq/arm_big_little.c
index cf62a1f64dd7..803d41c629c3 100644
--- a/drivers/cpufreq/arm_big_little.c
+++ b/drivers/cpufreq/arm_big_little.c@@ -24,6 +24,7 @@ #include <linux/cpufreq.h> #include <linux/cpumask.h> #include <linux/cpu_cooling.h> +#include <linux/energy_model.h> #include <linux/export.h> #include <linux/module.h> #include <linux/mutex.h>
@@ -456,6 +457,7 @@ static int get_cluster_clk_and_freq_table(struct device *cpu_dev, /* Per-CPU initialization */ static int bL_cpufreq_init(struct cpufreq_policy *policy) { + struct em_data_callback em_cb = EM_DATA_CB(of_dev_pm_opp_get_cpu_power); u32 cur_cluster = cpu_to_cluster(policy->cpu); struct device *cpu_dev; int ret;
@@ -487,6 +489,14 @@ static int bL_cpufreq_init(struct cpufreq_policy *policy) policy->cpuinfo.transition_latency = arm_bL_ops->get_transition_latency(cpu_dev); + ret = dev_pm_opp_get_opp_count(cpu_dev); + if (ret <= 0) { + dev_dbg(cpu_dev, "OPP table is not ready, deferring probe\n"); + return -EPROBE_DEFER; + } + + em_register_perf_domain(policy->cpus, ret, &em_cb); + if (is_bL_switching_enabled()) per_cpu(cpu_last_req_freq, policy->cpu) = clk_get_cpu_rate(policy->cpu);
--
2.20.1
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