Commit eb9c0d67 authored by Horatiu Vultur's avatar Horatiu Vultur Committed by Jakub Kicinski
Browse files

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: d0964594 ("net: lan966x: Add support for ptp clocks")
Signed-off-by: default avatarHoratiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 8467dda0

drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c

+4 −4
Original line number Diff line number Diff line
@@ -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)