igb: restore PPS signal on igb_ptp_reset

When a reset occurs, the PPS SYS_WRAP interrupt was not re-enabled which
resulted in disabling of the PPS signaling. Fix this by recording when
the interrupt is on and ensuring that we re-enable it every time we
reset.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

2 files changed, 5 insertions, 1 deletions

diff --git a/drivers/net/ethernet/intel/igb/igb.h b/drivers/net/ethernet/intel/igb/igb.h
index 03fbe4b7663b..d11093dce1b9 100644
--- a/drivers/net/ethernet/intel/igb/igb.h
+++ b/drivers/net/ethernet/intel/igb/igb.h
@@ -489,6 +489,7 @@ struct igb_adapter {
         struct timecounter tc;
         u32 tx_hwtstamp_timeouts;
         u32 rx_hwtstamp_cleared;
+        bool pps_sys_wrap_on;
 
         struct ptp_pin_desc sdp_config[IGB_N_SDP];
         struct {
diff --git a/drivers/net/ethernet/intel/igb/igb_ptp.c b/drivers/net/ethernet/intel/igb/igb_ptp.c
index 1dd14e166dc8..a7895c4cbcc3 100644
--- a/drivers/net/ethernet/intel/igb/igb_ptp.c
+++ b/drivers/net/ethernet/intel/igb/igb_ptp.c
@@ -591,6 +591,7 @@ static int igb_ptp_feature_enable_i210(struct ptp_clock_info *ptp,
                         tsim |= TSINTR_SYS_WRAP;
                 else
                         tsim &= ~TSINTR_SYS_WRAP;
+                igb->pps_sys_wrap_on = !!on;
                 wr32(E1000_TSIM, tsim);
                 spin_unlock_irqrestore(&igb->tmreg_lock, flags);
                 return 0;
@@ -1235,7 +1236,9 @@ void igb_ptp_reset(struct igb_adapter *adapter)
         case e1000_i211:
                 wr32(E1000_TSAUXC, 0x0);
                 wr32(E1000_TSSDP, 0x0);
-                wr32(E1000_TSIM, TSYNC_INTERRUPTS);
+                wr32(E1000_TSIM,
+                     TSYNC_INTERRUPTS |
+                     (adapter->pps_sys_wrap_on ? TSINTR_SYS_WRAP : 0));
                 wr32(E1000_IMS, E1000_IMS_TS);
                 break;
         default: