net: dsa: mv88e6xxx: check for mode change in port_setup_mac

The mv88e6xxx_port_setup_mac checks if the requested MAC settings are
different from the current ones, and if not, does nothing (since chaning
them requires putting the link down).

In this check it only looks if the triplet [link, speed, duplex] is
being changed.

This patch adds support to also check if the mode parameter (of type
phy_interface_t) is requested to be changed. The current mode is
computed by the ->port_link_state() method, and if it is different from
PHY_INTERFACE_MODE_NA, we check for equality with the requested mode.

In the implementations of the mv88e6250_port_link_state() method we set
the current mode to PHY_INTERFACE_MODE_NA - so the code does not check
for mode change on 6250.

In the mv88e6352_port_link_state() method, we use the cached cmode of
the port to determine the mode as phy_interface_t (and if it is not
enough, eg. for RGMII, we also look at the port control register for
RX/TX timings).

Signed-off-by: Marek Behún <[e-mail]>
Reviewed-by: Andrew Lunn <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/dsa/mv88e6xxx/chip.c

···
 	 */
 	if (state.link == link &&
 	    state.speed == speed &&
-	    state.duplex == duplex)
+	    state.duplex == duplex &&
+	    (state.interface == mode ||
+	     state.interface == PHY_INTERFACE_MODE_NA))
 		return 0;
 
 	/* Port's MAC control must not be changed unless the link is down */

drivers/net/dsa/mv88e6xxx/port.c

···
 	state->link = !!(reg & MV88E6250_PORT_STS_LINK);
 	state->an_enabled = 1;
 	state->an_complete = state->link;
+	state->interface = PHY_INTERFACE_MODE_NA;
 
 	return 0;
 }
···
 {
 	int err;
 	u16 reg;
+
+	switch (chip->ports[port].cmode) {
+	case MV88E6XXX_PORT_STS_CMODE_RGMII:
+		err = mv88e6xxx_port_read(chip, port, MV88E6XXX_PORT_MAC_CTL,
+					  &reg);
+		if (err)
+			return err;
+
+		if ((reg & MV88E6XXX_PORT_MAC_CTL_RGMII_DELAY_RXCLK) &&
+		    (reg & MV88E6XXX_PORT_MAC_CTL_RGMII_DELAY_TXCLK))
+			state->interface = PHY_INTERFACE_MODE_RGMII_ID;
+		else if (reg & MV88E6XXX_PORT_MAC_CTL_RGMII_DELAY_RXCLK)
+			state->interface = PHY_INTERFACE_MODE_RGMII_RXID;
+		else if (reg & MV88E6XXX_PORT_MAC_CTL_RGMII_DELAY_TXCLK)
+			state->interface = PHY_INTERFACE_MODE_RGMII_TXID;
+		else
+			state->interface = PHY_INTERFACE_MODE_RGMII;
+		break;
+	case MV88E6XXX_PORT_STS_CMODE_1000BASE_X:
+		state->interface = PHY_INTERFACE_MODE_1000BASEX;
+		break;
+	case MV88E6XXX_PORT_STS_CMODE_SGMII:
+		state->interface = PHY_INTERFACE_MODE_SGMII;
+		break;
+	case MV88E6XXX_PORT_STS_CMODE_2500BASEX:
+		state->interface = PHY_INTERFACE_MODE_2500BASEX;
+		break;
+	case MV88E6XXX_PORT_STS_CMODE_XAUI:
+		state->interface = PHY_INTERFACE_MODE_XAUI;
+		break;
+	case MV88E6XXX_PORT_STS_CMODE_RXAUI:
+		state->interface = PHY_INTERFACE_MODE_RXAUI;
+		break;
+	default:
+		/* we do not support other cmode values here */
+		state->interface = PHY_INTERFACE_MODE_NA;
+	}
 
 	err = mv88e6xxx_port_read(chip, port, MV88E6XXX_PORT_STS, &reg);
 	if (err)

drivers/net/dsa/mv88e6xxx/port.h

···
 #define MV88E6XXX_PORT_STS_TX_PAUSED		0x0020
 #define MV88E6XXX_PORT_STS_FLOW_CTL		0x0010
 #define MV88E6XXX_PORT_STS_CMODE_MASK		0x000f
+#define MV88E6XXX_PORT_STS_CMODE_RGMII		0x0007
 #define MV88E6XXX_PORT_STS_CMODE_100BASE_X	0x0008
 #define MV88E6XXX_PORT_STS_CMODE_1000BASE_X	0x0009
 #define MV88E6XXX_PORT_STS_CMODE_SGMII		0x000a