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PM / devfreq: add support for suspend/resume of a devfreq device

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The patch prepares devfreq device for handling suspend/resume
functionality. The new fields will store needed information during this
process. Devfreq framework handles opp-suspend DT entry and there is no
need of modyfications in the drivers code. It uses atomic variables to
make sure no race condition affects the process.

Suggested-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
Suggested-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
This commit is contained in:
Lukasz Luba 2018-12-05 12:05:53 +01:00 • committed by MyungJoo Ham
parent 633141721b
commit 83f8ca45af
2 changed files with 48 additions and 6 deletions
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7
include/linux/devfreq.h
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@ -131,6 +131,9 @@ struct devfreq_dev_profile {
* @scaling_min_freq: Limit minimum frequency requested by OPP interface
* @scaling_max_freq: Limit maximum frequency requested by OPP interface
* @stop_polling: devfreq polling status of a device.
* @suspend_freq: frequency of a device set during suspend phase.
* @resume_freq: frequency of a device set in resume phase.
* @suspend_count: suspend requests counter for a device.
* @total_trans: Number of devfreq transitions
* @trans_table: Statistics of devfreq transitions
* @time_in_state: Statistics of devfreq states
@ -167,6 +170,10 @@ struct devfreq {
unsigned long scaling_max_freq;
bool stop_polling;
unsigned long suspend_freq;
unsigned long resume_freq;
atomic_t suspend_count;
/* information for device frequency transition */
unsigned int total_trans;
unsigned int *trans_table;