ts2phc: Fix edge rejection for pulse widths over 0.5s.

If the configured pulse width is longer than 0.5 seconds, the calculated
range of ignored offsets is too small to cover the wrong edge. Fix the
calculation of the limits to use the minimum of pulsewidth and
(1.0s - pulsewidth). A pulsewidth of 0.5s should give the shortest interval.

Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>

ts2phc_pps_sink.c

@@ -175,6 +175,8 @@ static struct ts2phc_pps_sink *ts2phc_pps_sink_create(struct ts2phc_private *pri
 	sink->correction = nanoseconds_to_tmv(correction);
 
 	pulsewidth = config_get_int(cfg, device, "ts2phc.pulsewidth");
+	if (pulsewidth > 500000000)
+		pulsewidth = 1000000000 - pulsewidth;
 	pulsewidth /= 2;
 	sink->ignore_upper = 1000000000 - pulsewidth;
 	sink->ignore_lower = pulsewidth;