Subject: [PATCH net v2] net: phy: Fix qca8081 with speeds lower than 2.5Gb/s

From: Jonathan McDowell <[email-masked]>
Date: Mon, 31 Jan 2022 13:56:41 +0000

A typo in qca808x_read_status means we try to set SMII mode on the port
rather than SGMII when the link speed is not 2.5Gb/s. This results in no
traffic due to the mismatch in configuration between the phy and the
mac.

v2:
 Only change interface mode when the link is up

Fixes: 79c7bc0521545 ("net: phy: add qca8081 read_status")
Cc: [email-masked]
Signed-off-by: Jonathan McDowell <[email-masked]>
---
 drivers/net/phy/at803x.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
index 5b6c0d120e09..29aa811af430 100644
--- a/drivers/net/phy/at803x.c
+++ b/drivers/net/phy/at803x.c
@@ -1688,19 +1688,19 @@ static int qca808x_read_status(struct phy_device *phydev)
 	if (ret < 0)
 		return ret;
 
-	if (phydev->link && phydev->speed == SPEED_2500)
-		phydev->interface = PHY_INTERFACE_MODE_2500BASEX;
-	else
-		phydev->interface = PHY_INTERFACE_MODE_SMII;
-
-	/* generate seed as a lower random value to make PHY linked as SLAVE easily,
-	 * except for master/slave configuration fault detected.
-	 * the reason for not putting this code into the function link_change_notify is
-	 * the corner case where the link partner is also the qca8081 PHY and the seed
-	 * value is configured as the same value, the link can't be up and no link change
-	 * occurs.
-	 */
-	if (!phydev->link) {
+	if (phydev->link) {
+		if (phydev->speed == SPEED_2500)
+			phydev->interface = PHY_INTERFACE_MODE_2500BASEX;
+		else
+			phydev->interface = PHY_INTERFACE_MODE_SGMII;
+	} else {
+		/* generate seed as a lower random value to make PHY linked as SLAVE easily,
+		 * except for master/slave configuration fault detected.
+		 * the reason for not putting this code into the function link_change_notify is
+		 * the corner case where the link partner is also the qca8081 PHY and the seed
+		 * value is configured as the same value, the link can't be up and no link change
+		 * occurs.
+		 */
 		if (phydev->master_slave_state == MASTER_SLAVE_STATE_ERR) {
 			qca808x_phy_ms_seed_enable(phydev, false);
 		} else {
-- 
2.30.2