net/faraday: Clear stale interrupts

There is stale interrupt (PHYSTS_CHG in ISR, bit#6 in 0x0) from
the bootloader (uboot) when enabling the MAC. The stale interrupts
aren't part of kernel and should be cleared.

This clears the stale interrupts in ISR (0x0) when enabling the MAC.
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/faraday/ftgmac100.c

@@ -1112,6 +1112,7 @@ static int ftgmac100_poll(struct napi_struct *napi, int budget)
 static int ftgmac100_open(struct net_device *netdev)
 {
 	struct ftgmac100 *priv = netdev_priv(netdev);
+	unsigned int status;
 	int err;
 
 	err = ftgmac100_alloc_buffers(priv);
@@ -1137,6 +1138,11 @@ static int ftgmac100_open(struct net_device *netdev)
 
 	ftgmac100_init_hw(priv);
 	ftgmac100_start_hw(priv, priv->use_ncsi ? 100 : 10);
+
+	/* Clear stale interrupts */
+	status = ioread32(priv->base + FTGMAC100_OFFSET_ISR);
+	iowrite32(status, priv->base + FTGMAC100_OFFSET_ISR);
+
 	if (netdev->phydev)
 		phy_start(netdev->phydev);
 	else if (priv->use_ncsi)