1 files changed, 42 insertions, 50 deletions

diff --git a/drivers/net/ethernet/intel/igb/igb_ptp.c b/drivers/net/ethernet/intel/igb/igb_ptp.c
index f097c5a8ab93..e61b647f5f2a 100644
--- a/drivers/net/ethernet/intel/igb/igb_ptp.c
+++ b/drivers/net/ethernet/intel/igb/igb_ptp.c
@@ -684,6 +684,7 @@ void igb_ptp_rx_hang(struct igb_adapter *adapter)
 	u32 tsyncrxctl = rd32(E1000_TSYNCRXCTL);
 	unsigned long rx_event;
 
+	/* Other hardware uses per-packet timestamps */
 	if (hw->mac.type != e1000_82576)
 		return;
 
@@ -1042,6 +1043,13 @@ int igb_ptp_set_ts_config(struct net_device *netdev, struct ifreq *ifr)
 		-EFAULT : 0;
 }
 
+/**
+ * igb_ptp_init - Initialize PTP functionality
+ * @adapter: Board private structure
+ *
+ * This function is called at device probe to initialize the PTP
+ * functionality.
+ */
 void igb_ptp_init(struct igb_adapter *adapter)
 {
 	struct e1000_hw *hw = &adapter->hw;
@@ -1064,8 +1072,7 @@ void igb_ptp_init(struct igb_adapter *adapter)
 		adapter->cc.mask = CYCLECOUNTER_MASK(64);
 		adapter->cc.mult = 1;
 		adapter->cc.shift = IGB_82576_TSYNC_SHIFT;
-		/* Dial the nominal frequency. */
-		wr32(E1000_TIMINCA, INCPERIOD_82576 | INCVALUE_82576);
+		adapter->ptp_flags |= IGB_PTP_OVERFLOW_CHECK;
 		break;
 	case e1000_82580:
 	case e1000_i354:
@@ -1084,8 +1091,7 @@ void igb_ptp_init(struct igb_adapter *adapter)
 		adapter->cc.mask = CYCLECOUNTER_MASK(IGB_NBITS_82580);
 		adapter->cc.mult = 1;
 		adapter->cc.shift = 0;
-		/* Enable the timer functions by clearing bit 31. */
-		wr32(E1000_TSAUXC, 0x0);
+		adapter->ptp_flags |= IGB_PTP_OVERFLOW_CHECK;
 		break;
 	case e1000_i210:
 	case e1000_i211:
@@ -1110,44 +1116,24 @@ void igb_ptp_init(struct igb_adapter *adapter)
 		adapter->ptp_caps.settime64 = igb_ptp_settime_i210;
 		adapter->ptp_caps.enable = igb_ptp_feature_enable_i210;
 		adapter->ptp_caps.verify = igb_ptp_verify_pin;
-		/* Enable the timer functions by clearing bit 31. */
-		wr32(E1000_TSAUXC, 0x0);
 		break;
 	default:
 		adapter->ptp_clock = NULL;
 		return;
 	}
 
-	wrfl();
-
 	spin_lock_init(&adapter->tmreg_lock);
 	INIT_WORK(&adapter->ptp_tx_work, igb_ptp_tx_work);
 
-	/* Initialize the clock and overflow work for devices that need it. */
-	if ((hw->mac.type == e1000_i210) || (hw->mac.type == e1000_i211)) {
-		struct timespec64 ts = ktime_to_timespec64(ktime_get_real());
-
-		igb_ptp_settime_i210(&adapter->ptp_caps, &ts);
-	} else {
-		timecounter_init(&adapter->tc, &adapter->cc,
-				 ktime_to_ns(ktime_get_real()));
-
+	if (adapter->ptp_flags & IGB_PTP_OVERFLOW_CHECK)
 		INIT_DELAYED_WORK(&adapter->ptp_overflow_work,
 				  igb_ptp_overflow_check);
 
-		schedule_delayed_work(&adapter->ptp_overflow_work,
-				      IGB_SYSTIM_OVERFLOW_PERIOD);
-	}
-
-	/* Initialize the time sync interrupts for devices that support it. */
-	if (hw->mac.type >= e1000_82580) {
-		wr32(E1000_TSIM, TSYNC_INTERRUPTS);
-		wr32(E1000_IMS, E1000_IMS_TS);
-	}
-
 	adapter->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
 	adapter->tstamp_config.tx_type = HWTSTAMP_TX_OFF;
 
+	igb_ptp_reset(adapter);
+
 	adapter->ptp_clock = ptp_clock_register(&adapter->ptp_caps,
 						&adapter->pdev->dev);
 	if (IS_ERR(adapter->ptp_clock)) {
@@ -1156,32 +1142,24 @@ void igb_ptp_init(struct igb_adapter *adapter)
 	} else {
 		dev_info(&adapter->pdev->dev, "added PHC on %s\n",
 			 adapter->netdev->name);
-		adapter->flags |= IGB_FLAG_PTP;
+		adapter->ptp_flags |= IGB_PTP_ENABLED;
 	}
 }
 
 /**
- * igb_ptp_stop - Disable PTP device and stop the overflow check.
- * @adapter: Board private structure.
+ * igb_ptp_suspend - Disable PTP work items and prepare for suspend
+ * @adapter: Board private structure
  *
- * This function stops the PTP support and cancels the delayed work.
- **/
-void igb_ptp_stop(struct igb_adapter *adapter)
+ * This function stops the overflow check work and PTP Tx timestamp work, and
+ * will prepare the device for OS suspend.
+ */
+void igb_ptp_suspend(struct igb_adapter *adapter)
 {
-	switch (adapter->hw.mac.type) {
-	case e1000_82576:
-	case e1000_82580:
-	case e1000_i354:
-	case e1000_i350:
-		cancel_delayed_work_sync(&adapter->ptp_overflow_work);
-		break;
-	case e1000_i210:
-	case e1000_i211:
-		/* No delayed work to cancel. */
-		break;
-	default:
+	if (!(adapter->ptp_flags & IGB_PTP_ENABLED))
 		return;
-	}
+
+	if (adapter->ptp_flags & IGB_PTP_OVERFLOW_CHECK)
+		cancel_delayed_work_sync(&adapter->ptp_overflow_work);
 
 	cancel_work_sync(&adapter->ptp_tx_work);
 	if (adapter->ptp_tx_skb) {
@@ -1189,12 +1167,23 @@ void igb_ptp_stop(struct igb_adapter *adapter)
 		adapter->ptp_tx_skb = NULL;
 		clear_bit_unlock(__IGB_PTP_TX_IN_PROGRESS, &adapter->state);
 	}
+}
+
+/**
+ * igb_ptp_stop - Disable PTP device and stop the overflow check.
+ * @adapter: Board private structure.
+ *
+ * This function stops the PTP support and cancels the delayed work.
+ **/
+void igb_ptp_stop(struct igb_adapter *adapter)
+{
+	igb_ptp_suspend(adapter);
 
 	if (adapter->ptp_clock) {
 		ptp_clock_unregister(adapter->ptp_clock);
 		dev_info(&adapter->pdev->dev, "removed PHC on %s\n",
 			 adapter->netdev->name);
-		adapter->flags &= ~IGB_FLAG_PTP;
+		adapter->ptp_flags &= ~IGB_PTP_ENABLED;
 	}
 }
 
@@ -1209,9 +1198,6 @@ void igb_ptp_reset(struct igb_adapter *adapter)
 	struct e1000_hw *hw = &adapter->hw;
 	unsigned long flags;
 
-	if (!(adapter->flags & IGB_FLAG_PTP))
-		return;
-
 	/* reset the tstamp_config */
 	igb_ptp_set_timestamp_mode(adapter, &adapter->tstamp_config);
 
@@ -1248,4 +1234,10 @@ void igb_ptp_reset(struct igb_adapter *adapter)
 	}
 out:
 	spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
+
+	wrfl();
+
+	if (adapter->ptp_flags & IGB_PTP_OVERFLOW_CHECK)
+		schedule_delayed_work(&adapter->ptp_overflow_work,
+				      IGB_SYSTIM_OVERFLOW_PERIOD);
 }