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Message-Id: <20190820084833.6019-3-hubert.feurstein@vahle.at>
Date: Tue, 20 Aug 2019 10:48:31 +0200
From: Hubert Feurstein <h.feurstein@...il.com>
To: netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Hubert Feurstein <h.feurstein@...il.com>,
Andrew Lunn <andrew@...n.ch>,
Richard Cochran <richardcochran@...il.com>,
Miroslav Lichvar <mlichvar@...hat.com>,
Florian Fainelli <f.fainelli@...il.com>,
Heiner Kallweit <hkallweit1@...il.com>,
Vladimir Oltean <olteanv@...il.com>,
"David S. Miller" <davem@...emloft.net>
Subject: [PATCH net-next v3 2/4] net: mdio: add PTP offset compensation to mdiobus_write_sts
From: Hubert Feurstein <h.feurstein@...il.com>
The slow MDIO access introduces quite a big offset (~13us) to the PTP
system time synchronisation. With this patch the driver has the possibility
to set the correct offset which can then be compensated.
Signed-off-by: Hubert Feurstein <h.feurstein@...il.com>
---
drivers/net/phy/mdio_bus.c | 12 ++++++++++++
include/linux/phy.h | 8 ++++++++
2 files changed, 20 insertions(+)
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 4dba2714495e..50a37cf46f96 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -739,6 +739,18 @@ int __mdiobus_write_sts(struct mii_bus *bus, int addr, u32 regnum, u16 val,
if (!(bus->flags & MII_BUS_F_PTP_STS_SUPPORTED))
ptp_read_system_postts(sts);
+ /* PTP offset compensation:
+ * After the MDIO access is completed (from the chip perspective), the
+ * switch chip will snapshot the PHC timestamp. To make sure our system
+ * timestamp corresponds to the PHC timestamp, we have to add the
+ * duration of this MDIO access to sts->post_ts. Linuxptp's phc2sys
+ * takes the average of pre_ts and post_ts to calculate the final
+ * system timestamp. With this in mind, we have to add ptp_sts_offset
+ * twice to post_ts, in order to not introduce an constant time offset.
+ */
+ if (sts)
+ timespec64_add_ns(&sts->post_ts, 2 * bus->ptp_sts_offset);
+
return retval;
}
EXPORT_SYMBOL(__mdiobus_write_sts);
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 0b33662e0320..615df9c7f2c3 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -283,8 +283,16 @@ struct mii_bus {
* The ptp_read_system_*ts functions already check the ptp_sts pointer.
* The MII_BUS_F_PTP_STS_SUPPORTED-bit must be set in flags, when the
* MDIO bus driver takes the timestamps as described above.
+ *
+ * @ptp_sts_offset: This is the compensation offset for the system
+ * timestamp which is introduced by the slow MDIO access duration. An
+ * MDIO access consists of 32 clock cycles. Usually the MDIO bus runs
+ * at ~2.5MHz, so we have to compensate ~12800ns offset.
+ * Set the ptp_sts_offset to the exact duration of one MDIO frame
+ * (= 32 * clock-period) in nano-seconds.
*/
struct ptp_system_timestamp *ptp_sts;
+ u32 ptp_sts_offset;
};
#define to_mii_bus(d) container_of(d, struct mii_bus, dev)
--
2.22.1
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