Messages in this thread Patch in this message | | | From | Quentin Perret <> | Subject | [PATCH v3 4/5] cpufreq: arm_big_little: Register an Energy Model | Date | Fri, 1 Feb 2019 09:31:00 +0000 |
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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 <quentin.perret@arm.com> --- drivers/cpufreq/arm_big_little.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/cpufreq/arm_big_little.c b/drivers/cpufreq/arm_big_little.c index cf62a1f64dd7..18b05bcb2614 100644 --- a/drivers/cpufreq/arm_big_little.c +++ b/drivers/cpufreq/arm_big_little.c @@ -487,6 +487,14 @@ 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; + } + + dev_pm_opp_of_register_em(policy->cpus, ret); + 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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