Currently the default behavior is to manually having the devfreq backend to register themselves as a devfreq cooling device.
Instead of adding the code in the drivers for the thermal cooling device registering, let's provide a flag in the devfreq's profile to tell the common devfreq code to register the newly created devfreq as a cooling device. Suggested-by: Chanwoo Choi <[email protected]> Signed-off-by: Daniel Lezcano <[email protected]> --- drivers/devfreq/devfreq.c | 11 +++++++++++ include/linux/devfreq.h | 7 +++++++ 2 files changed, 18 insertions(+) diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index b6d63f02d293..5c0fdd3a48d2 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -11,6 +11,7 @@ #include <linux/kmod.h> #include <linux/sched.h> #include <linux/debugfs.h> +#include <linux/devfreq_cooling.h> #include <linux/errno.h> #include <linux/err.h> #include <linux/init.h> @@ -26,6 +27,7 @@ #include <linux/hrtimer.h> #include <linux/of.h> #include <linux/pm_qos.h> +#include <linux/thermal.h> #include <linux/units.h> #include "governor.h" @@ -935,6 +937,13 @@ struct devfreq *devfreq_add_device(struct device *dev, mutex_unlock(&devfreq_list_lock); + if (devfreq->profile->is_cooling_device) { + devfreq->cdev = devfreq_cooling_em_register(devfreq, NULL); + if (IS_ERR(devfreq->cdev)) + dev_info(dev, "Failed to register devfreq " + "cooling device\n"); + } + return devfreq; err_init: @@ -960,6 +969,8 @@ int devfreq_remove_device(struct devfreq *devfreq) if (!devfreq) return -EINVAL; + thermal_cooling_device_unregister(devfreq->cdev); + if (devfreq->governor) { devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_STOP, NULL); diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h index 26ea0850be9b..554e7904b0c5 100644 --- a/include/linux/devfreq.h +++ b/include/linux/devfreq.h @@ -98,11 +98,15 @@ struct devfreq_dev_status { * @freq_table: Optional list of frequencies to support statistics * and freq_table must be generated in ascending order. * @max_state: The size of freq_table. + * + * @is_cooling_device: A self-explanatory boolean giving the device a + * cooling effect property. */ struct devfreq_dev_profile { unsigned long initial_freq; unsigned int polling_ms; enum devfreq_timer timer; + bool is_cooling_device; int (*target)(struct device *dev, unsigned long *freq, u32 flags); int (*get_dev_status)(struct device *dev, @@ -198,6 +202,9 @@ struct devfreq { struct srcu_notifier_head transition_notifier_list; + /* Pointer to the cooling device if used for thermal mitigation */ + struct thermal_cooling_device *cdev; + struct notifier_block nb_min; struct notifier_block nb_max; }; -- 2.17.1
