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PM / devfreq: Add tracepoint for frequency changes

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Add a tracepoint for frequency changes of devfreq devices and
use it.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
[cw00.choi: Move print position of tracepoint and add more information]
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Matthias Kaehlcke
2020-10-07 22:03:59 +09:00
committed by Chanwoo Choi
parent b4365423bb
commit cab477d0d4
2 changed files with 36 additions and 0 deletions
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8
drivers/devfreq/devfreq.c
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@@ -367,6 +367,14 @@ static int devfreq_set_target(struct devfreq *devfreq, unsigned long new_freq,
return err;
}
/*
* Print devfreq_frequency trace information between DEVFREQ_PRECHANGE
* and DEVFREQ_POSTCHANGE because for showing the correct frequency
* change order of between devfreq device and passive devfreq device.
*/
if (trace_devfreq_frequency_enabled() && new_freq != cur_freq)
trace_devfreq_frequency(devfreq, new_freq, cur_freq);
freqs.new = new_freq;
devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE);