[OpenWrt-Devel] [PATCH 6/6] ar8216: display flow control info in swconfig get_link in case of autonegatiation too

[Heiner Kallweit]

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 at gmail.com>
---
 target/linux/generic/files/drivers/net/phy/ar8327.c | 18 +++++++++++++++++-
 target/linux/generic/files/drivers/net/phy/ar8327.h |  2 ++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/target/linux/generic/files/drivers/net/phy/ar8327.c b/target/linux/generic/files/drivers/net/phy/ar8327.c
index c0262d7..12b825f 100644
--- a/target/linux/generic/files/drivers/net/phy/ar8327.c
+++ b/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
diff --git a/target/linux/generic/files/drivers/net/phy/ar8327.h b/target/linux/generic/files/drivers/net/phy/ar8327.h
index 1877f00..f0ef013 100644
--- a/target/linux/generic/files/drivers/net/phy/ar8327.h
+++ b/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)
-- 
2.2.1
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