net: mvpp2: check first level interrupt status registers

Check the first level interrupt status registers to determine how to
further process the port interrupt. We will need this to know whether
to invoke the link status processing and/or the PTP processing for
both XLG and GMAC.
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/mvpp2/mvpp2.h

@@ -461,6 +461,8 @@
 #define     MVPP22_CTRL4_DP_CLK_SEL		BIT(5)
 #define     MVPP22_CTRL4_SYNC_BYPASS_DIS	BIT(6)
 #define     MVPP22_CTRL4_QSGMII_BYPASS_ACTIVE	BIT(7)
+#define MVPP22_GMAC_INT_SUM_STAT		0xa0
+#define	    MVPP22_GMAC_INT_SUM_STAT_INTERNAL	BIT(1)
 #define MVPP22_GMAC_INT_SUM_MASK		0xa4
 #define     MVPP22_GMAC_INT_SUM_MASK_LINK_STAT	BIT(1)
 
@@ -488,6 +490,8 @@
 #define     MVPP22_XLG_CTRL3_MACMODESELECT_MASK	(7 << 13)
 #define     MVPP22_XLG_CTRL3_MACMODESELECT_GMAC	(0 << 13)
 #define     MVPP22_XLG_CTRL3_MACMODESELECT_10G	(1 << 13)
+#define MVPP22_XLG_EXT_INT_STAT			0x158
+#define     MVPP22_XLG_EXT_INT_STAT_XLG		BIT(1)
 #define MVPP22_XLG_EXT_INT_MASK			0x15c
 #define     MVPP22_XLG_EXT_INT_MASK_XLG		BIT(1)
 #define     MVPP22_XLG_EXT_INT_MASK_GIG		BIT(2)

drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c

@@ -3039,13 +3039,22 @@ static void mvpp2_isr_handle_gmac_internal(struct mvpp2_port *port)
 static irqreturn_t mvpp2_port_isr(int irq, void *dev_id)
 {
 	struct mvpp2_port *port = (struct mvpp2_port *)dev_id;
+	u32 val;
 
 	mvpp22_gop_mask_irq(port);
 
 	if (mvpp2_port_supports_xlg(port) &&
 	    mvpp2_is_xlg(port->phy_interface)) {
+		/* Check the external status register */
+		val = readl(port->base + MVPP22_XLG_EXT_INT_STAT);
+		if (val & MVPP22_XLG_EXT_INT_STAT_XLG)
 			mvpp2_isr_handle_xlg(port);
 	} else {
+		/* If it's not the XLG, we must be using the GMAC.
+		 * Check the summary status.
+		 */
+		val = readl(port->base + MVPP22_GMAC_INT_SUM_STAT);
+		if (val & MVPP22_GMAC_INT_SUM_STAT_INTERNAL)
 			mvpp2_isr_handle_gmac_internal(port);
 	}