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 | |
| parent | net: dsa: mv88e6xxx: add rx/tx timestamping support (diff) | |
| download | linux-dev-a2e47134e577713add97124afd812bc3f93627fb.tar.xz linux-dev-a2e47134e577713add97124afd812bc3f93627fb.zip | |
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')
| -rw-r--r-- | drivers/net/dsa/mv88e6xxx/hwtstamp.c | 13 | ||||
| -rw-r--r-- | drivers/net/dsa/mv88e6xxx/hwtstamp.h | 9 |
2 files changed, 22 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; } diff --git a/drivers/net/dsa/mv88e6xxx/hwtstamp.h b/drivers/net/dsa/mv88e6xxx/hwtstamp.h index 18ff39cdab4c..bc71c9212a08 100644 --- a/drivers/net/dsa/mv88e6xxx/hwtstamp.h +++ b/drivers/net/dsa/mv88e6xxx/hwtstamp.h @@ -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 |