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Fix updating of nano slew offset correction error

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This commit is contained in:
Miroslav Lichvar 2010-08-11 16:57:19 +02:00
parent a3d47ffc81
commit fa84496423
1 changed files with 23 additions and 11 deletions
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34
sys_linux.c
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@ -271,27 +271,38 @@ update_nano_slew_error(long offset, int new)
if (offset == 0 && nano_slew_error == 0)
return;
if (gettimeofday(&now, &tz) < 0) {
CROAK("gettimeofday() failed");
}
/* maximum error in offset reported by adjtimex, assuming PLL constant 0
and SHIFT_PLL = 2 */
offset /= new ? 4 : 3;
if (offset < 0)
offset = -offset;
UTI_DiffTimevalsToDouble(&ago, &now, &nano_slew_error_start);
if (ago > 1.1) {
if (!new && nano_slew_error > offset)
nano_slew_error = offset;
if (new || nano_slew_error_start.tv_sec > 0) {
if (gettimeofday(&now, &tz) < 0) {
CROAK("gettimeofday() failed");
}
}
/* When PLL offset is newly set, use the maximum of the old and new error.
Otherwise use the minimum, but only when the last update is older than
1.1 seconds to be sure the previous adjustment is already gone. */
if (!new) {
if (nano_slew_error > offset) {
if (nano_slew_error_start.tv_sec == 0) {
nano_slew_error = offset;
} else {
UTI_DiffTimevalsToDouble(&ago, &now, &nano_slew_error_start);
if (ago > 1.1) {
nano_slew_error_start.tv_sec = 0;
nano_slew_error = offset;
}
}
}
} else {
if (nano_slew_error < offset)
nano_slew_error = offset;
}
if (new)
nano_slew_error_start = now;
}
}
static double
@ -448,6 +459,7 @@ initiate_slew(void)
CROAK("adjtimex() failed in accrue_offset");
}
offset_register -= (double) offset / 1.0e9;
update_nano_slew_error(offset, 0);
offset = 0;
if (TMX_ApplyPLLOffset(offset) < 0) {