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PM / devfreq: Register devfreq as a cooling device on demand

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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 <cwchoi00@gmail.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Daniel Lezcano
2021-03-08 14:30:37 +01:00
committed by Chanwoo Choi
parent fe07bfda2f
commit 1224451bb6
2 changed files with 18 additions and 0 deletions
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9
include/linux/devfreq.h
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@@ -38,6 +38,7 @@ enum devfreq_timer {
struct devfreq;
struct devfreq_governor;
struct thermal_cooling_device;
/**
* struct devfreq_dev_status - Data given from devfreq user device to
@@ -98,11 +99,15 @@ 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,
@@ -156,6 +161,7 @@ struct devfreq_stats {
* @suspend_count: suspend requests counter for a device.
* @stats: Statistics of devfreq device behavior
* @transition_notifier_list: list head of DEVFREQ_TRANSITION_NOTIFIER notifier
* @cdev: Cooling device pointer if the devfreq has cooling property
* @nb_min: Notifier block for DEV_PM_QOS_MIN_FREQUENCY
* @nb_max: Notifier block for DEV_PM_QOS_MAX_FREQUENCY
*
@@ -198,6 +204,9 @@ 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;
};