netdev - Re: [uclinux-dist-devel] [PATCH RFC net-next 2/4] bfin_mac: replace sys time stamps with raw ones instead.

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Date:	Tue, 30 Oct 2012 14:41:12 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	Bob Liu <lliubbo@...il.com>
Cc:	netdev@...r.kernel.org, Miroslav Lichvar <mlichvar@...hat.com>,
	John Ronciak <john.ronciak@...el.com>,
	John Stultz <john.stultz@...aro.org>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	device-drivers-devel@...ckfin.uclinux.org,
	Jacob Keller <jacob.e.keller@...el.com>,
	uclinux-dist-devel@...ckfin.uclinux.org,
	Patrick Ohly <patrick.ohly@...el.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [uclinux-dist-devel] [PATCH RFC net-next 2/4] bfin_mac:
 replace sys time stamps with raw ones instead.

On Tue, Oct 30, 2012 at 05:17:51PM +0800, Bob Liu wrote:

> > @@ -892,51 +879,25 @@ static void bfin_rx_hwtstamp(struct net_device *netdev, struct sk_buff *skb)
> >
> >         regval = bfin_read_EMAC_PTP_RXSNAPLO();
> >         regval |= (u64)bfin_read_EMAC_PTP_RXSNAPHI() << 32;
> > -       ns = timecounter_cyc2time(&lp->clock, regval);
> > -       timecompare_update(&lp->compare, ns);
> > +       ns = regval >> lp->shift;
> >         memset(shhwtstamps, 0, sizeof(*shhwtstamps));
> >         shhwtstamps->hwtstamp = ns_to_ktime(ns);
> > -       shhwtstamps->syststamp = timecompare_transform(&lp->compare, ns);
> > -
> > -       bfin_dump_hwtamp("RX", &shhwtstamps->hwtstamp, &shhwtstamps->syststamp, &lp->compare);
> > -}
> 
> In my test,  system time in slave side can't be updated although here
> have set shhwtstamps->hwtstamp = ns_to_ktime(ns).
> Any idea?

So the "system time" in shhwtstamps->syststamp has been removed. Only
the raw value remains.

Or what do you mean by "can't be updated"?

How did you test this?

I would suggest the following:

1. test using Documentation/ptp/testptp to make sure the clock is
   working reasconably.

2. try ptp4l from http://linuxptp.sourceforge.net/ to make sure the
   time stamping is working

Thanks,
Richard
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