net/faraday: Mask PHY interrupt with NCSI mode

Bogus PHY interrupts are observed. This masks the PHY interrupt
when the interface works in NCSI mode as there is no attached
PHY under the circumstance.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/faraday/ftgmac100.c

@@ -74,6 +74,7 @@ struct ftgmac100 {
 
 	struct mii_bus *mii_bus;
 	int old_speed;
+	int int_mask_all;
 	bool use_ncsi;
 	bool enabled;
 };
@@ -84,14 +85,6 @@ static int ftgmac100_alloc_rx_page(struct ftgmac100 *priv,
 /******************************************************************************
  * internal functions (hardware register access)
  *****************************************************************************/
-#define INT_MASK_ALL_ENABLED	(FTGMAC100_INT_RPKT_LOST	| \
-				 FTGMAC100_INT_XPKT_ETH		| \
-				 FTGMAC100_INT_XPKT_LOST	| \
-				 FTGMAC100_INT_AHB_ERR		| \
-				 FTGMAC100_INT_PHYSTS_CHG	| \
-				 FTGMAC100_INT_RPKT_BUF		| \
-				 FTGMAC100_INT_NO_RXBUF)
-
 static void ftgmac100_set_rx_ring_base(struct ftgmac100 *priv, dma_addr_t addr)
 {
 	iowrite32(addr, priv->base + FTGMAC100_OFFSET_RXR_BADR);
@@ -1070,8 +1063,9 @@ static int ftgmac100_poll(struct napi_struct *napi, int budget)
 		ftgmac100_tx_complete(priv);
 	}
 
-	if (status & (FTGMAC100_INT_NO_RXBUF | FTGMAC100_INT_RPKT_LOST |
-		      FTGMAC100_INT_AHB_ERR | FTGMAC100_INT_PHYSTS_CHG)) {
+	if (status & priv->int_mask_all & (FTGMAC100_INT_NO_RXBUF |
+			FTGMAC100_INT_RPKT_LOST | FTGMAC100_INT_AHB_ERR |
+			FTGMAC100_INT_PHYSTS_CHG)) {
 		if (net_ratelimit())
 			netdev_info(netdev, "[ISR] = 0x%x: %s%s%s%s\n", status,
 				    status & FTGMAC100_INT_NO_RXBUF ? "NO_RXBUF " : "",
@@ -1094,7 +1088,8 @@ static int ftgmac100_poll(struct napi_struct *napi, int budget)
 		napi_complete(napi);
 
 		/* enable all interrupts */
-		iowrite32(INT_MASK_ALL_ENABLED, priv->base + FTGMAC100_OFFSET_IER);
+		iowrite32(priv->int_mask_all,
+			  priv->base + FTGMAC100_OFFSET_IER);
 	}
 
 	return rx;
@@ -1140,7 +1135,7 @@ static int ftgmac100_open(struct net_device *netdev)
 	netif_start_queue(netdev);
 
 	/* enable all interrupts */
-	iowrite32(INT_MASK_ALL_ENABLED, priv->base + FTGMAC100_OFFSET_IER);
+	iowrite32(priv->int_mask_all, priv->base + FTGMAC100_OFFSET_IER);
 
 	/* Start the NCSI device */
 	if (priv->use_ncsi) {
@@ -1365,6 +1360,13 @@ static int ftgmac100_probe(struct platform_device *pdev)
 	/* MAC address from chip or random one */
 	ftgmac100_setup_mac(priv);
 
+	priv->int_mask_all = (FTGMAC100_INT_RPKT_LOST |
+			      FTGMAC100_INT_XPKT_ETH |
+			      FTGMAC100_INT_XPKT_LOST |
+			      FTGMAC100_INT_AHB_ERR |
+			      FTGMAC100_INT_PHYSTS_CHG |
+			      FTGMAC100_INT_RPKT_BUF |
+			      FTGMAC100_INT_NO_RXBUF);
 	if (pdev->dev.of_node &&
 	    of_get_property(pdev->dev.of_node, "use-ncsi", NULL)) {
 		if (!IS_ENABLED(CONFIG_NET_NCSI)) {
@@ -1374,6 +1376,7 @@ static int ftgmac100_probe(struct platform_device *pdev)
 
 		dev_info(&pdev->dev, "Using NCSI interface\n");
 		priv->use_ncsi = true;
+		priv->int_mask_all &= ~FTGMAC100_INT_PHYSTS_CHG;
 		priv->ndev = ncsi_register_dev(netdev, ftgmac100_ncsi_handler);
 		if (!priv->ndev)
 			goto err_ncsi_dev;