net: dsa: microchip: lan937x: clear the POR_READY_INT status bit

In the lan937x_reset_switch(), it masks all the switch and port
registers. In the Global_Int_status register, POR ready bit is write 1
to clear bit and all other bits are read only. So, this patch clear the
por_ready_int status bit by writing 1.
Signed-off-by: Arun Ramadoss <arun.ramadoss@microchip.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/microchip/lan937x_main.c

@@ -225,6 +225,10 @@ int lan937x_reset_switch(struct ksz_device *dev)
 	if (ret < 0)
 		return ret;
 
+	ret = ksz_write32(dev, REG_SW_INT_STATUS__4, POR_READY_INT);
+	if (ret < 0)
+		return ret;
+
 	ret = ksz_write32(dev, REG_SW_PORT_INT_MASK__4, 0xFF);
 	if (ret < 0)
 		return ret;