netdev - [PATCH net-next] dp83640: Adjust ptp event timestamps

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Date:	Wed, 9 Jul 2014 12:22:23 +0200
From:	Stefan Sørensen 
	<stefan.sorensen@...ctralink.com>
To:	<richardcochran@...il.com>
CC:	<netdev@...r.kernel.org>,
	Stefan Sørensen 
	<stefan.sorensen@...ctralink.com>
Subject: [PATCH net-next] dp83640: Adjust ptp event timestamps

>From the dp86340 Software Development Guide:
  Event timestamp values should be adjusted by 3*reference clock period +
  11 ns = 35 ns to compensate for input path and synchronization delays.

So subtract 35ns from event timestamps.

Signed-off-by: Stefan Sørensen <stefan.sorensen@...ctralink.com>
---
 drivers/net/phy/dp83640.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/phy/dp83640.c b/drivers/net/phy/dp83640.c
index 53bd1af..76fbd39 100644
--- a/drivers/net/phy/dp83640.c
+++ b/drivers/net/phy/dp83640.c
@@ -755,6 +755,9 @@ static int decode_evnt(struct dp83640_private *dp83640,
 	event.type = PTP_CLOCK_EXTTS;
 	event.timestamp = phy2txts(&dp83640->edata);
 
+	/* Compensate for input path and synchronization delays */
+	event.timestamp -= 35;
+
 	for (i = 0; i < N_EXT_TS; i++) {
 		if (ext_status & exts_chan_to_edata(i)) {
 			event.index = i;
-- 
1.9.3

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