net: dsa: mv88e6xxx: get rid of SPEED_MAX setting

Currently, all the device specific speed setting functions convert
SPEED_MAX to the actual speed of the port. Rather than having each
of the mv88e6xxx chip specifics handling SPEED_MAX, derive it from
the mac_capabilities instead.

This is only needed for CPU and DSA ports, so move the logic up into
mv88e6xxx_setup_port() - which allows us to kill off all users of
SPEED_MAX throughout the driver.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: Russell King

drivers/net/dsa/mv88e6xxx/chip.c

@@ -449,9 +449,6 @@ static int mv88e6xxx_port_setup_mac(struct mv88e6xxx_chip *chip, int port,
 			goto restore_link;
 	}
 
-	if (speed == SPEED_MAX && chip->info->ops->port_max_speed_mode)
-		mode = chip->info->ops->port_max_speed_mode(port);
-
 	if (chip->info->ops->port_set_pause) {
 		err = chip->info->ops->port_set_pause(chip, port, pause);
 		if (err)
@@ -3280,28 +3277,51 @@ static int mv88e6xxx_setup_port(struct mv88e6xxx_chip *chip, int port)
 {
 	struct device_node *phy_handle = NULL;
 	struct dsa_switch *ds = chip->ds;
+	phy_interface_t mode;
 	struct dsa_port *dp;
-	int tx_amp;
+	int tx_amp, speed;
 	int err;
 	u16 reg;
 
 	chip->ports[port].chip = chip;
 	chip->ports[port].port = port;
 
+	dp = dsa_to_port(ds, port);
+
 	/* MAC Forcing register: don't force link, speed, duplex or flow control
 	 * state to any particular values on physical ports, but force the CPU
 	 * port and all DSA ports to their maximum bandwidth and full duplex.
 	 */
-	if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
+	if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)) {
+		unsigned long caps = dp->pl_config.mac_capabilities;
+
+		if (chip->info->ops->port_max_speed_mode)
+			mode = chip->info->ops->port_max_speed_mode(port);
+		else
+			mode = PHY_INTERFACE_MODE_NA;
+
+		if (caps & MAC_10000FD)
+			speed = SPEED_10000;
+		else if (caps & MAC_5000FD)
+			speed = SPEED_5000;
+		else if (caps & MAC_2500FD)
+			speed = SPEED_2500;
+		else if (caps & MAC_1000)
+			speed = SPEED_1000;
+		else if (caps & MAC_100)
+			speed = SPEED_100;
+		else
+			speed = SPEED_10;
+
 		err = mv88e6xxx_port_setup_mac(chip, port, LINK_FORCED_UP,
-					       SPEED_MAX, DUPLEX_FULL,
-					       PAUSE_OFF,
-					       PHY_INTERFACE_MODE_NA);
-	else
+					       speed, DUPLEX_FULL,
+					       PAUSE_OFF, mode);
+	} else {
 		err = mv88e6xxx_port_setup_mac(chip, port, LINK_UNFORCED,
 					       SPEED_UNFORCED, DUPLEX_UNFORCED,
 					       PAUSE_ON,
 					       PHY_INTERFACE_MODE_NA);
+	}
 	if (err)
 		return err;
 
@@ -3473,7 +3493,6 @@ static int mv88e6xxx_setup_port(struct mv88e6xxx_chip *chip, int port)
 	}
 
 	if (chip->info->ops->serdes_set_tx_amplitude) {
-		dp = dsa_to_port(ds, port);
 		if (dp)
 			phy_handle = of_parse_phandle(dp->dn, "phy-handle", 0);
 

drivers/net/dsa/mv88e6xxx/chip.h

@@ -488,14 +488,13 @@ struct mv88e6xxx_ops {
 	int (*port_set_pause)(struct mv88e6xxx_chip *chip, int port,
 			      int pause);
 
-#define SPEED_MAX		INT_MAX
 #define SPEED_UNFORCED		-2
 #define DUPLEX_UNFORCED		-2
 
 	/* Port's MAC speed (in Mbps) and MAC duplex mode
 	 *
 	 * Depending on the chip, 10, 100, 200, 1000, 2500, 10000 are valid.
-	 * Use SPEED_UNFORCED for normal detection, SPEED_MAX for max value.
+	 * Use SPEED_UNFORCED for normal detection.
 	 *
 	 * Use DUPLEX_HALF or DUPLEX_FULL to force half or full duplex,
 	 * or DUPLEX_UNFORCED for normal duplex detection.

drivers/net/dsa/mv88e6xxx/port.c

@@ -298,9 +298,6 @@ static int mv88e6xxx_port_set_speed_duplex(struct mv88e6xxx_chip *chip,
 int mv88e6185_port_set_speed_duplex(struct mv88e6xxx_chip *chip, int port,
 				    int speed, int duplex)
 {
-	if (speed == SPEED_MAX)
-		speed = 1000;
-
 	if (speed == 200 || speed > 1000)
 		return -EOPNOTSUPP;
 
@@ -312,9 +309,6 @@ int mv88e6185_port_set_speed_duplex(struct mv88e6xxx_chip *chip, int port,
 int mv88e6250_port_set_speed_duplex(struct mv88e6xxx_chip *chip, int port,
 				    int speed, int duplex)
 {
-	if (speed == SPEED_MAX)
-		speed = 100;
-
 	if (speed > 100)
 		return -EOPNOTSUPP;
 
@@ -326,9 +320,6 @@ int mv88e6250_port_set_speed_duplex(struct mv88e6xxx_chip *chip, int port,
 int mv88e6341_port_set_speed_duplex(struct mv88e6xxx_chip *chip, int port,
 				    int speed, int duplex)
 {
-	if (speed == SPEED_MAX)
-		speed = port < 5 ? 1000 : 2500;
-
 	if (speed > 2500)
 		return -EOPNOTSUPP;
 
@@ -354,9 +345,6 @@ phy_interface_t mv88e6341_port_max_speed_mode(int port)
 int mv88e6352_port_set_speed_duplex(struct mv88e6xxx_chip *chip, int port,
 				    int speed, int duplex)
 {
-	if (speed == SPEED_MAX)
-		speed = 1000;
-
 	if (speed > 1000)
 		return -EOPNOTSUPP;
 
@@ -371,9 +359,6 @@ int mv88e6352_port_set_speed_duplex(struct mv88e6xxx_chip *chip, int port,
 int mv88e6390_port_set_speed_duplex(struct mv88e6xxx_chip *chip, int port,
 				    int speed, int duplex)
 {
-	if (speed == SPEED_MAX)
-		speed = port < 9 ? 1000 : 2500;
-
 	if (speed > 2500)
 		return -EOPNOTSUPP;
 
@@ -399,9 +384,6 @@ phy_interface_t mv88e6390_port_max_speed_mode(int port)
 int mv88e6390x_port_set_speed_duplex(struct mv88e6xxx_chip *chip, int port,
 				     int speed, int duplex)
 {
-	if (speed == SPEED_MAX)
-		speed = port < 9 ? 1000 : 10000;
-
 	if (speed == 200 && port != 0)
 		return -EOPNOTSUPP;
 
@@ -430,9 +412,6 @@ int mv88e6393x_port_set_speed_duplex(struct mv88e6xxx_chip *chip, int port,
 	u16 reg, ctrl;
 	int err;
 
-	if (speed == SPEED_MAX)
-		speed = (port > 0 && port < 9) ? 1000 : 10000;
-
 	if (speed == 200 && port != 0)
 		return -EOPNOTSUPP;