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cpufreq: Auto-register the driver as a thermal cooling device if asked

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All cpufreq drivers do similar things to register as a cooling device.
Provide a cpufreq driver flag so drivers can just ask the cpufreq core
to register the cooling device on their behalf. This allows us to get
rid of duplicated code in the drivers.

In order to allow this, we add a struct thermal_cooling_device pointer
to struct cpufreq_policy so that drivers don't need to store it in a
private data structure.

Suggested-by: Stephen Boyd <swboyd@chromium.org>
Suggested-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Tested-by: Matthias Kaehlcke <mka@chromium.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Amit Kucheria
2019-01-30 10:52:01 +05:30
committed by Rafael J. Wysocki
parent afa1f2ab43
commit 5c238a8b59
2 changed files with 20 additions and 0 deletions
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11
drivers/cpufreq/cpufreq.c
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@@ -19,6 +19,7 @@
#include <linux/cpu.h>
#include <linux/cpufreq.h>
#include <linux/cpu_cooling.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/init.h>
@@ -1316,6 +1317,10 @@ static int cpufreq_online(unsigned int cpu)
if (cpufreq_driver->ready)
cpufreq_driver->ready(policy);
if (IS_ENABLED(CONFIG_CPU_THERMAL) &&
cpufreq_driver->flags & CPUFREQ_IS_COOLING_DEV)
policy->cdev = of_cpufreq_cooling_register(policy);
pr_debug("initialization complete\n");
return 0;
@@ -1403,6 +1408,12 @@ static int cpufreq_offline(unsigned int cpu)
goto unlock;
}
if (IS_ENABLED(CONFIG_CPU_THERMAL) &&
cpufreq_driver->flags & CPUFREQ_IS_COOLING_DEV) {
cpufreq_cooling_unregister(policy->cdev);
policy->cdev = NULL;
}
if (cpufreq_driver->stop_cpu)
cpufreq_driver->stop_cpu(policy);