- Reduce "extra" added latency when trying to enter light
sleep from 500ms to 50us, since light sleep states
(e.g. "WFI idle") usually have microsecond-range residency
times.
- Keep "extra" latency when entering deep sleep the same at
1100ms (as we're trying to enter the deepest sleep state
available, it doesn't hurt).
- Replace k_uptime_delta() with manual subtraction since
k_uptime_delta() updates starting timestamp which leads to
incorrect timing measurement when k_uptime_delta() is
called for the second time.
- Measuring PM sleep entry latency using pm_notifier entry
callback, do it only for the first PM entry event after
calling k_usleep(), as during the sleep PM entry & exit
may happen multiple times and that is normal.
Signed-off-by: Roman Dobrodii <rdobrodii@antmicro.com>
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