netdev - [PATCH net-next] Let the ADJ_OFFSET interface respect the STA

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Message-Id: <20200524132800.20010-1-richardcochran@gmail.com>
Date:   Sun, 24 May 2020 06:28:00 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     netdev@...r.kernel.org
Cc:     David Miller <davem@...emloft.net>,
        Miroslav Lichvar <mlichvar@...hat.com>,
        John Stultz <john.stultz@...aro.org>,
        Vincent Cheng <vincent.cheng.xh@...esas.com>
Subject: [PATCH net-next] Let the ADJ_OFFSET interface respect the STA_NANO flag for PHC devices.

In commit 184ecc9eb260d5a3bcdddc5bebd18f285ac004e9 ("ptp: Add adjphase
function to support phase offset control.")  the PTP Hardware Clock
interface expanded to support the ADJ_OFFSET offset mode.  However,
the implementation did not respect the traditional yet pedantic
distinction between units of microseconds and nanoseconds signaled by
the STA_NANO flag.  This patch fixes the issue by adding logic to
handle that flag.

Signed-off-by: Richard Cochran <richardcochran@...il.com>
---
 drivers/ptp/ptp_clock.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c
index fc984a8828fb..7ae6e8e85f99 100644
--- a/drivers/ptp/ptp_clock.c
+++ b/drivers/ptp/ptp_clock.c
@@ -147,8 +147,13 @@ static int ptp_clock_adjtime(struct posix_clock *pc, struct __kernel_timex *tx)
 			err = ops->adjfreq(ops, ppb);
 		ptp->dialed_frequency = tx->freq;
 	} else if (tx->modes & ADJ_OFFSET) {
-		if (ops->adjphase)
-			err = ops->adjphase(ops, tx->offset);
+		if (ops->adjphase) {
+			s32 offset = tx->offset;
+			if (!(tx->status & STA_NANO)) {
+				offset *= NSEC_PER_USEC;
+			}
+			err = ops->adjphase(ops, offset);
+		}
 	} else if (tx->modes == 0) {
 		tx->freq = ptp->dialed_frequency;
 		err = 0;
-- 
2.20.1