net: dsa: mv88e6xxx: Re-setup interrupts on CMODE change.

When a port changes CMODE, the SERDES interface being used can change.
Disable interrupts for the old SERDES interface, and enable interrupts
on the new.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx/port.c

@@ -342,8 +342,9 @@ int mv88e6390x_port_set_speed(struct mv88e6xxx_chip *chip, int port, int speed)
 int mv88e6390x_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
 			      phy_interface_t mode)
 {
-	u16 reg;
+	int lane;
 	u16 cmode;
+	u16 reg;
 	int err;
 
 	if (mode == PHY_INTERFACE_MODE_NA)
@@ -373,6 +374,16 @@ int mv88e6390x_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
 		cmode = 0;
 	}
 
+	lane = mv88e6390x_serdes_get_lane(chip, port);
+	if (lane < 0)
+		return lane;
+
+	if (chip->ports[port].serdes_irq) {
+		err = mv88e6390_serdes_irq_disable(chip, port, lane);
+		if (err)
+			return err;
+	}
+
 	err = mv88e6390_serdes_power(chip, port, false);
 	if (err)
 		return err;
@@ -392,6 +403,12 @@ int mv88e6390x_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
 		err = mv88e6390_serdes_power(chip, port, true);
 		if (err)
 			return err;
+
+		if (chip->ports[port].serdes_irq) {
+			err = mv88e6390_serdes_irq_enable(chip, port, lane);
+			if (err)
+				return err;
+		}
 	}
 
 	chip->ports[port].cmode = cmode;

drivers/net/dsa/mv88e6xxx/serdes.c

@@ -214,7 +214,7 @@ static int mv88e6390_serdes_get_lane(struct mv88e6xxx_chip *chip, int port)
  * use multiple lanes. If so, return the first lane the port uses.
  * Returns -ENODEV if a port does not have a lane.
  */
-static int mv88e6390x_serdes_get_lane(struct mv88e6xxx_chip *chip, int port)
+int mv88e6390x_serdes_get_lane(struct mv88e6xxx_chip *chip, int port)
 {
 	u8 cmode_port9, cmode_port10, cmode_port;
 
@@ -576,6 +576,8 @@ void mv88e6390_serdes_irq_free(struct mv88e6xxx_chip *chip, int port)
 	mutex_unlock(&chip->reg_lock);
 	free_irq(chip->ports[port].serdes_irq, &chip->ports[port]);
 	mutex_lock(&chip->reg_lock);
+
+	chip->ports[port].serdes_irq = 0;
 }
 
 int mv88e6341_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on)

drivers/net/dsa/mv88e6xxx/serdes.h

@@ -57,6 +57,7 @@
 #define MV88E6390_SGMII_INT_FALSE_CARRIER	BIT(7)
 #define MV88E6390_SGMII_INT_STATUS	0xa002
 
+int mv88e6390x_serdes_get_lane(struct mv88e6xxx_chip *chip, int port);
 int mv88e6341_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on);
 int mv88e6352_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on);
 int mv88e6390_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on);
@@ -68,4 +69,9 @@ int mv88e6352_serdes_get_strings(struct mv88e6xxx_chip *chip,
 				 int port, uint8_t *data);
 int mv88e6352_serdes_get_stats(struct mv88e6xxx_chip *chip, int port,
 			       uint64_t *data);
+int mv88e6390_serdes_irq_enable(struct mv88e6xxx_chip *chip, int port,
+				int lane);
+int mv88e6390_serdes_irq_disable(struct mv88e6xxx_chip *chip, int port,
+				 int lane);
+
 #endif