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Commit a2e47134 authored by Brandon Streiff's avatar Brandon Streiff Committed by David S. Miller
Browse files

net: dsa: mv88e6xxx: add workaround for 6341 timestamping 



88E6341 devices default to timestamping at the PHY, but due to a
hardware issue, timestamps via this component are unreliable. For
this family, configure the PTP hardware to force the timestamping
to occur at the MAC.

Signed-off-by: default avatarBrandon Streiff <brandon.streiff@ni.com>
Signed-off-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c6fe0ad2

drivers/net/dsa/mv88e6xxx/hwtstamp.c

+13 −0
Original line number Diff line number Diff line
@@ -563,6 +563,19 @@ int mv88e6xxx_hwtstamp_setup(struct mv88e6xxx_chip *chip) 
	if (err)

		return err;



	/* 88E6341 devices default to timestamping at the PHY, but this has

	 * a hardware issue that results in unreliable timestamps. Force

	 * these devices to timestamp at the MAC.

	 */

	if (chip->info->family == MV88E6XXX_FAMILY_6341) {

		u16 val = MV88E6341_PTP_CFG_UPDATE |

			  MV88E6341_PTP_CFG_MODE_IDX |

			  MV88E6341_PTP_CFG_MODE_TS_AT_MAC;

		err = mv88e6xxx_ptp_write(chip, MV88E6341_PTP_CFG, val);

		if (err)

			return err;

	}



	return 0;

}

drivers/net/dsa/mv88e6xxx/hwtstamp.h

+9 −0
Original line number Diff line number Diff line
@@ -34,6 +34,15 @@ 
/* Offset 0x02: Timestamp Arrival Capture Pointers */

#define MV88E6XXX_PTP_TS_ARRIVAL_PTR	0x02



/* Offset 0x07: PTP Global Configuration */

#define MV88E6341_PTP_CFG			0x07

#define MV88E6341_PTP_CFG_UPDATE		0x8000

#define MV88E6341_PTP_CFG_IDX_MASK		0x7f00

#define MV88E6341_PTP_CFG_DATA_MASK		0x00ff

#define MV88E6341_PTP_CFG_MODE_IDX		0x0

#define MV88E6341_PTP_CFG_MODE_TS_AT_PHY	0x00

#define MV88E6341_PTP_CFG_MODE_TS_AT_MAC	0x80



/* Offset 0x08: PTP Interrupt Status */

#define MV88E6XXX_PTP_IRQ_STATUS	0x08