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net: lan966x: Update lan966x_ptp_get_nominal_value

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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: d096459494 ("net: lan966x: Add support for ptp clocks")
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Horatiu Vultur 2022-04-09 20:41:40 +02:00 committed by Jakub Kicinski
parent 8467dda0c2
commit eb9c0d671e
1 changed files with 4 additions and 4 deletions
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8
drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c
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@ -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)