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

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>

diff --git a/drivers/net/ethernet/intel/igb/igb_ptp.c b/drivers/net/ethernet/intel/igb/igb_ptp.c
index e3b9b63ad01083cb987429f57c9ebef84d86f4db..c3a9392cbc192229f4178c913fad8ab64d8c44c3 100644 (file)
--- a/drivers/net/ethernet/intel/igb/igb_ptp.c
+++ b/drivers/net/ethernet/intel/igb/igb_ptp.c
@@ -538,8 +538,8 @@ 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 {