ar8216: display flow control info in swconfig get_link in case of autonegatiation too

The swconfig get_link attribute (at least) on AR8327/AR8337 doesn't
consider the autonegotiated flow control.
AR8327/AR8337 provide the info about autonegotiated rx/tx flow control
in bits 10 and 11 of the port status register.
Use these values to display info about autonegotiated rx/tx flow
control as part of the get_link attribute.

Successfully tested on TL-WDR4900 (AR8327 rev.4) and
TL-WDR4300 (AR8327 rev.2).

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>

SVN-Revision: 44023

target/linux/generic/files/drivers/net/phy/ar8327.c

@@ -710,7 +710,23 @@ ar8327_init_port(struct ar8xxx_priv *priv, int port)
 static u32
 ar8327_read_port_status(struct ar8xxx_priv *priv, int port)
 {
-	return ar8xxx_read(priv, AR8327_REG_PORT_STATUS(port));
+	u32 t;
+
+	t = ar8xxx_read(priv, AR8327_REG_PORT_STATUS(port));
+	/* map the flow control autoneg result bits to the flow control bits
+	 * used in forced mode to allow ar8216_read_port_link detect
+	 * flow control properly if autoneg is used
+	 */
+	if (t & AR8216_PORT_STATUS_LINK_UP &&
+	    t & AR8216_PORT_STATUS_LINK_AUTO) {
+		t &= ~(AR8216_PORT_STATUS_TXFLOW | AR8216_PORT_STATUS_RXFLOW);
+		if (t & AR8327_PORT_STATUS_TXFLOW_AUTO)
+			t |= AR8216_PORT_STATUS_TXFLOW;
+		if (t & AR8327_PORT_STATUS_RXFLOW_AUTO)
+			t |= AR8216_PORT_STATUS_RXFLOW;
+	}
+
+	return t;
 }
 
 static u32

target/linux/generic/files/drivers/net/phy/ar8327.h

@@ -84,6 +84,8 @@
 #define   AR8327_MAX_FRAME_SIZE_MTU		BITS(0, 14)
 
 #define AR8327_REG_PORT_STATUS(_i)		(0x07c + (_i) * 4)
+#define   AR8327_PORT_STATUS_TXFLOW_AUTO	BIT(10)
+#define   AR8327_PORT_STATUS_RXFLOW_AUTO	BIT(11)
 
 #define AR8327_REG_HEADER_CTRL			0x098
 #define AR8327_REG_PORT_HEADER(_i)		(0x09c + (_i) * 4)