On Wed, May 18, 2022 at 03:39:35PM -0700, Jonathan Lemon wrote:

+static int bcm_ptp_adjtime_locked(struct bcm_ptp_private *priv,
+				  s64 delta_ns)
+{
+	struct timespec64 ts;
+	int err;
+
+	err = bcm_ptp_gettime_locked(priv, &ts, NULL);
+	if (!err) {
+		set_normalized_timespec64(&ts, ts.tv_sec,
+					  ts.tv_nsec + delta_ns);

This also takes a LONG time when delta is large...

+		err = bcm_ptp_settime_locked(priv, &ts);
+	}
+	return err;
+}

Try this instead:

	s64 ns;

	err = bcm_ptp_gettime_locked(priv, &ts, NULL);
	if (err) {
		return err;
	}
	ns = timespec64_to_ns(&ts);		
	ns += delta_ns;
	ts = ns_to_timespec64(ns);
	err = bcm_ptp_settime_locked(priv, &ts);

	return err;

Thanks,
Richard