diff options
| author | Horatiu Vultur <horatiu.vultur@microchip.com> | 2022-04-09 20:41:40 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-04-11 20:47:15 -0700 |
| commit | eb9c0d671e9432901b8a453e7915416f22f7f919 (patch) | |
| tree | bc5f79476f4d838c0317babb4e48e1a1e6345128 /drivers/net | |
| parent | 8467dda0c26583547731e7f3ea73fc3856bae3bf (diff) | |
| download | linux-eb9c0d671e9432901b8a453e7915416f22f7f919.tar.bz2 | |
net: lan966x: Update lan966x_ptp_get_nominal_value
The clk_per_cfg register represents the value added to the system clock
for each clock cycle. The issue is that the default value is wrong,
meaning that in case the DUT was a grandmaster then everone in the
network was too slow. In case there was a grandmaster, then there is no
issue because the DUT will configure clk_per_cfg register based on the
master frequency.
Fixes: d096459494a887 ("net: lan966x: Add support for ptp clocks")
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c b/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c index ae782778d6dd..0a1041da4384 100644 --- a/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c @@ -29,10 +29,10 @@ enum { static u64 lan966x_ptp_get_nominal_value(void) { - u64 res = 0x304d2df1; - - res <<= 32; - return res; + /* This is the default value that for each system clock, the time of day + * is increased. It has the format 5.59 nanosecond. + */ + return 0x304d4873ecade305; } int lan966x_ptp_hwtstamp_set(struct lan966x_port *port, struct ifreq *ifr) |