netdev - Re: [PATCH net-next v5 2/2] net: phy: broadcom: Add PTP support for some Broadcom PHYs.

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Date:   Sat, 28 May 2022 17:34:47 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Jonathan Lemon <jonathan.lemon@...il.com>
Cc:     netdev@...r.kernel.org, f.fainelli@...il.com, andrew@...n.ch,
        hkallweit1@...il.com, linux@...linux.org.uk,
        bcm-kernel-feedback-list@...adcom.com, kernel-team@...com,
        davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com
Subject: Re: [PATCH net-next v5 2/2] net: phy: broadcom: Add PTP support for
 some Broadcom PHYs.

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