pch_gbe: scale time stamps to nanoseconds

This patch fixes the helper functions that give the transmit and
receive time stamps to return nanoseconds, instead of arbitrary clock
ticks.

[ RC - Rebased Takahiro's changes and wrote a commit message
  explaining the changes. ]

Signed-off-by: Takahiro Shimizu <tshimizu818@gmail.com>
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/ptp/ptp_pch.c b/drivers/ptp/ptp_pch.c
index 375eb04c16ea..847a3c3e31e4 100644
--- a/drivers/ptp/ptp_pch.c
+++ b/drivers/ptp/ptp_pch.c
@@ -261,6 +261,7 @@ u64 pch_rx_snap_read(struct pci_dev *pdev)
 
         ns = ((u64) hi) << 32;
         ns |= lo;
+        ns <<= TICKS_NS_SHIFT;
 
         return ns;
 }
@@ -277,6 +278,7 @@ u64 pch_tx_snap_read(struct pci_dev *pdev)
 
         ns = ((u64) hi) << 32;
         ns |= lo;
+        ns <<= TICKS_NS_SHIFT;
 
         return ns;
 }