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pps: capture MONOTONIC_RAW timestamps as well

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MONOTONIC_RAW clock timestamps are ideally suited for frequency
calculation and also fit well into the original NTP hardpps design.  Now
phase and frequency can be adjusted separately: the former based on
REALTIME clock and the latter based on MONOTONIC_RAW clock.

A new function getnstime_raw_and_real is added to timekeeping subsystem to
capture both timestamps at the same time and atomically.

Signed-off-by: Alexander Gordeev <lasaine@lvk.cs.msu.su>
Acked-by: John Stultz <johnstul@us.ibm.com>
Cc: Rodolfo Giometti <giometti@enneenne.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexander Gordeev 2011-01-12 17:00:57 -08:00 • committed by Linus Torvalds
parent 025b40abe7
commit e2c18e49a0
3 changed files with 59 additions and 0 deletions
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14
include/linux/pps_kernel.h
View file

@ -47,6 +47,9 @@ struct pps_source_info {
};
struct pps_event_time {
#ifdef CONFIG_NTP_PPS
struct timespec ts_raw;
#endif /* CONFIG_NTP_PPS */
struct timespec ts_real;
};
@ -97,10 +100,21 @@ static inline void timespec_to_pps_ktime(struct pps_ktime *kt,
kt->nsec = ts.tv_nsec;
}
#ifdef CONFIG_NTP_PPS
static inline void pps_get_ts(struct pps_event_time *ts)
{
getnstime_raw_and_real(&ts->ts_raw, &ts->ts_real);
}
#else /* CONFIG_NTP_PPS */
static inline void pps_get_ts(struct pps_event_time *ts)
{
getnstimeofday(&ts->ts_real);
}
#endif /* CONFIG_NTP_PPS */
#endif /* LINUX_PPS_KERNEL_H */