diff options
| author | Brandon Streiff <brandon.streiff@ni.com> | 2018-02-14 01:07:51 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-02-14 14:33:37 -0500 |
| commit | a2e47134e577713add97124afd812bc3f93627fb (patch) | |
| tree | d779fcb16a984e9c1070269050d885c2d73ce120 /drivers/net/dsa/mv88e6xxx/hwtstamp.c | |
| parent | c6fe0ad2c3499cca7c7b3be83958e6f7e961f567 (diff) | |
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: Brandon Streiff <brandon.streiff@ni.com>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/dsa/mv88e6xxx/hwtstamp.c')
| -rw-r--r-- | drivers/net/dsa/mv88e6xxx/hwtstamp.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/net/dsa/mv88e6xxx/hwtstamp.c b/drivers/net/dsa/mv88e6xxx/hwtstamp.c index 1b8f79b2c939..b251d534b70d 100644 --- a/drivers/net/dsa/mv88e6xxx/hwtstamp.c +++ b/drivers/net/dsa/mv88e6xxx/hwtstamp.c @@ -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; } |