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hwclock: fix conversion of HW timestamps

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Fix a sign error in conversion of HW time to local time, which caused
the jitter to be amplified instead of reduced. NTP with HW timestamping
should now be more stable and able to ignore occasionally delayed
readings of PHC.
This commit is contained in:
Miroslav Lichvar
2017-08-04 15:08:40 +02:00
parent be8215e181
commit 4534db84c4
1 changed files with 1 additions and 1 deletions
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hwclock.c
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@@ -198,7 +198,7 @@ HCL_CookTime(HCL_Instance clock, struct timespec *raw, struct timespec *cooked,
return 0;
elapsed = UTI_DiffTimespecsToDouble(raw, &clock->hw_ref);
offset = clock->offset + elapsed / clock->frequency;
offset = elapsed / clock->frequency - clock->offset;
UTI_AddDoubleToTimespec(&clock->local_ref, offset, cooked);
/* Fow now, just return the error of the last sample */