From: Sergey Organov <sorganov@gmail.com>
Date: Wed, 15 Jul 2020 18:42:58 +0300
Subject: net: fec: initialize clock with 0 rather than current kernel time
Git-commit: 199560343e9dac0e5f9e54307de767ef3fc781f4
Patch-mainline: v5.9-rc1
References: jsc#SLE-16106

Initializing with 0 makes it much easier to identify time stamps from
otherwise uninitialized clock.

Initialization of PTP clock with current kernel time makes little sense as
PTP time scale differs from UTC time scale that kernel time represents.
It only leads to confusion when no actual PTP initialization happens, as
these time scales differ in a small integer number of seconds (37 at the
time of writing.)

Signed-off-by: Sergey Organov <sorganov@gmail.com>
Acked-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
 drivers/net/ethernet/freescale/fec_ptp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/freescale/fec_ptp.c b/drivers/net/ethernet/freescale/fec_ptp.c
index fda306b3e21f..4bec7e66a39b 100644
--- a/drivers/net/ethernet/freescale/fec_ptp.c
+++ b/drivers/net/ethernet/freescale/fec_ptp.c
@@ -264,7 +264,7 @@ void fec_ptp_start_cyclecounter(struct net_device *ndev)
 	fep->cc.mult = FEC_CC_MULT;
 
 	/* reset the ns time counter */
-	timecounter_init(&fep->tc, &fep->cc, ktime_to_ns(ktime_get_real()));
+	timecounter_init(&fep->tc, &fep->cc, 0);
 
 	spin_unlock_irqrestore(&fep->tmreg_lock, flags);
 }