From: Andrew Lunn <andrew@lunn.ch>
To: Hubert Feurstein <h.feurstein@gmail.com>
Cc: netdev <netdev@vger.kernel.org>,
lkml <linux-kernel@vger.kernel.org>,
Richard Cochran <richardcochran@gmail.com>,
Vivien Didelot <vivien.didelot@gmail.com>,
Florian Fainelli <f.fainelli@gmail.com>,
Vladimir Oltean <olteanv@gmail.com>,
"David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH net-next 2/3] net: dsa: mv88e6xxx: extend PTP gettime function to read system clock
Date: Mon, 19 Aug 2019 19:34:41 +0200 [thread overview]
Message-ID: <20190819173441.GB29991@lunn.ch> (raw)
In-Reply-To: <CAFfN3gUNrnjdOt8bW2EugzjSZMb_vvdEaLN0yOv_06=roqcJYQ@mail.gmail.com>
On Mon, Aug 19, 2019 at 07:14:25PM +0200, Hubert Feurstein wrote:
> Hi Andrew,
>
> Am Mo., 19. Aug. 2019 um 15:27 Uhr schrieb Andrew Lunn <andrew@lunn.ch>:
> >
> > > @@ -45,7 +45,8 @@ static int mv88e6xxx_smi_direct_write(struct mv88e6xxx_chip *chip,
> > > {
> > > int ret;
> > >
> > > - ret = mdiobus_write_nested(chip->bus, dev, reg, data);
> > > + ret = mdiobus_write_sts_nested(chip->bus, dev, reg, data,
> > > + chip->ptp_sts);
> > > if (ret < 0)
> > > return ret;
> > >
> >
> > Please also make a similar change to mv88e6xxx_smi_indirect_write().
> > The last write in that function should be timestamped.
> Since it is already the last write it should be already ok (The
> mv88e6xxx_smi_indirect_write
> calls the mv88e6xxx_smi_direct_write which initiates the timestamping).
Hi Hubert
But you are also time stamping the first write as well. And it seems
like it is not completely for free. So it would be nice to limit it to
the write which actually matters.
Andrew
next prev parent reply other threads:[~2019-08-19 17:34 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-16 16:31 [PATCH net-next 0/3] Improve phc2sys precision for mv88e6xxx switch in combination with imx6-fec Hubert Feurstein
2019-08-16 16:31 ` [PATCH net-next 1/3] net: mdio: add support for passing a PTP system timestamp to the mii_bus driver Hubert Feurstein
2019-08-17 3:30 ` Richard Cochran
2019-08-19 13:17 ` Andrew Lunn
2019-08-19 13:34 ` Vladimir Oltean
2019-08-19 13:37 ` Vladimir Oltean
2019-08-19 15:14 ` Andrew Lunn
2019-08-16 16:31 ` [PATCH net-next 2/3] net: dsa: mv88e6xxx: extend PTP gettime function to read system clock Hubert Feurstein
2019-08-19 13:27 ` Andrew Lunn
2019-08-19 15:16 ` Vivien Didelot
2019-08-19 15:20 ` Andrew Lunn
2019-08-19 17:14 ` Hubert Feurstein
2019-08-19 17:34 ` Andrew Lunn [this message]
2019-08-16 16:31 ` [PATCH net-next 3/3] net: fec: add support for PTP system timestamping for MDIO devices Hubert Feurstein
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