net: igb: fix the start time for periodic output signals

[ Upstream commit 58c98be137830d34b79024cc5dc95ef54fcd7ffe ]

When programming the start of a periodic output, the code wrongly places
the seconds value into the "low" register and the nanoseconds into the
"high" register.  Even though this is backwards, it slipped through my
testing, because the re-arming code in the interrupt service routine is
correct, and the signal does appear starting with the second edge.

This patch fixes the issue by programming the registers correctly.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/intel/igb/igb_ptp.c b/drivers/net/ethernet/intel/igb/igb_ptp.c
index d20fc8ed11f1574a2ae0fa4649be23fe204e1308..c3657652b6312a8bdc0610b0ffb634daa85505c9 100644 (file)
--- a/drivers/net/ethernet/intel/igb/igb_ptp.c
+++ b/drivers/net/ethernet/intel/igb/igb_ptp.c
@@ -540,8 +540,8 @@ static int igb_ptp_feature_enable_i210(struct ptp_clock_info *ptp,
                        igb->perout[i].start.tv_nsec = rq->perout.start.nsec;
                        igb->perout[i].period.tv_sec = ts.tv_sec;
                        igb->perout[i].period.tv_nsec = ts.tv_nsec;
-                       wr32(trgttiml, rq->perout.start.sec);
-                       wr32(trgttimh, rq->perout.start.nsec);
+                       wr32(trgttimh, rq->perout.start.sec);
+                       wr32(trgttiml, rq->perout.start.nsec);
                        tsauxc |= tsauxc_mask;
                        tsim |= tsim_mask;
                } else {