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From: Andrew Lunn <andrew@lunn.ch>
To: Hubert Feurstein <h.feurstein@gmail.com>
Cc: netdev@vger.kernel.org, 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 15:27:33 +0200	[thread overview]
Message-ID: <20190819132733.GE8981@lunn.ch> (raw)
In-Reply-To: <20190816163157.25314-3-h.feurstein@gmail.com>

> @@ -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.

Vivien, please could you think about these changes with respect to
RMU. We probably want to skip the RMU in this case, so we get slow but
uniform jitter, vs fast and unpredictable jitter from using the RMU.

Thanks
	Andrew

  reply	other threads:[~2019-08-19 13:27 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 [this message]
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
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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