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PM / devfreq: Add PM QoS support

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Register notifiers with the PM QoS framework in order to respond to
requests for DEV_PM_QOS_MIN_FREQUENCY and DEV_PM_QOS_MAX_FREQUENCY.

No notifiers are added by this patch but PM QoS constraints can be
imposed externally (for example from other devices).

Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Tested-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Leonard Crestez 2019-12-05 12:05:06 +02:00 • committed by Chanwoo Choi
parent 42a6b25e67
commit 05d7ae15cf
2 changed files with 82 additions and 0 deletions
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5
include/linux/devfreq.h
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@ -136,6 +136,8 @@ struct devfreq_dev_profile {
* @time_in_state: Statistics of devfreq states
* @last_stat_updated: The last time stat updated
* @transition_notifier_list: list head of DEVFREQ_TRANSITION_NOTIFIER notifier
* @nb_min: Notifier block for DEV_PM_QOS_MIN_FREQUENCY
* @nb_max: Notifier block for DEV_PM_QOS_MAX_FREQUENCY
*
* This structure stores the devfreq information for a give device.
*
@ -178,6 +180,9 @@ struct devfreq {
unsigned long last_stat_updated;
struct srcu_notifier_head transition_notifier_list;
struct notifier_block nb_min;
struct notifier_block nb_max;
};
struct devfreq_freqs {