net: phy: as21xxx: fix read_status speed handling

With further test with 2.5G NIC it was discovered that
phy_resolve_aneg_linkmode is not enough to detect speed higher that 1G
when autoneg is enabled.

Also in the switch case there is a typo where the speed mask is AND with
VEND1_SPEED_STATUS instead of the correct mask VEND1_SPEED_MASK.

Rework the read_status code to always read the speed from the vendor
register and parse the generic bit only for the pause frame.

Fixes: 830877d ("net: phy: Add support for Aeonsemi AS21xxx PHYs")
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

Author: Ansuel

drivers/net/phy/as21xxx.c

@@ -671,7 +671,7 @@ static int as21xxx_read_link(struct phy_device *phydev, int *bmcr)
 
 static int as21xxx_read_c22_lpa(struct phy_device *phydev)
 {
-	int lpagb;
+	int lpagb, lpa;
 
 	/* MII_STAT1000 are only filled in the mapped C22
 	 * in C45, use that to fill lpagb values and check.
@@ -698,12 +698,20 @@ static int as21xxx_read_c22_lpa(struct phy_device *phydev)
 	mii_stat1000_mod_linkmode_lpa_t(phydev->lp_advertising,
 					lpagb);
 
+	lpa = phy_read_mmd(phydev, MDIO_MMD_AN,
+			   AS21XXX_MDIO_AN_C22 + MII_LPA);
+	if (lpa < 0)
+		return lpa;
+
+	mii_lpa_mod_linkmode_lpa_t(phydev->lp_advertising, lpa);
+
 	return 0;
 }
 
 static int as21xxx_read_status(struct phy_device *phydev)
 {
 	int bmcr, old_link = phydev->link;
+	int speed;
 	int ret;
 
 	ret = as21xxx_read_link(phydev, &bmcr);
@@ -720,58 +728,60 @@ static int as21xxx_read_status(struct phy_device *phydev)
 	phydev->asym_pause = 0;
 
 	if (phydev->autoneg == AUTONEG_ENABLE) {
-		ret = genphy_c45_read_lpa(phydev);
-		if (ret)
-			return ret;
+		if (!phydev->autoneg_complete) {
+			mii_stat1000_mod_linkmode_lpa_t(phydev->lp_advertising,
+							0);
+			mii_lpa_mod_linkmode_lpa_t(phydev->lp_advertising, 0);
+			return 0;
+		}
 
 		ret = as21xxx_read_c22_lpa(phydev);
 		if (ret)
 			return ret;
-
-		phy_resolve_aneg_linkmode(phydev);
 	} else {
-		int speed;
-
 		linkmode_zero(phydev->lp_advertising);
+	}
 
-		speed = phy_read_mmd(phydev, MDIO_MMD_VEND1,
-				     VEND1_SPEED_STATUS);
-		if (speed < 0)
-			return speed;
-
-		switch (speed & VEND1_SPEED_STATUS) {
-		case VEND1_SPEED_10000:
-			phydev->speed = SPEED_10000;
-			phydev->duplex = DUPLEX_FULL;
-			break;
-		case VEND1_SPEED_5000:
-			phydev->speed = SPEED_5000;
-			phydev->duplex = DUPLEX_FULL;
-			break;
-		case VEND1_SPEED_2500:
-			phydev->speed = SPEED_2500;
-			phydev->duplex = DUPLEX_FULL;
-			break;
-		case VEND1_SPEED_1000:
-			phydev->speed = SPEED_1000;
-			if (bmcr & BMCR_FULLDPLX)
-				phydev->duplex = DUPLEX_FULL;
-			else
-				phydev->duplex = DUPLEX_HALF;
-			break;
-		case VEND1_SPEED_100:
-			phydev->speed = SPEED_100;
+	speed = phy_read_mmd(phydev, MDIO_MMD_VEND1,
+			     VEND1_SPEED_STATUS);
+	if (speed < 0)
+		return speed;
+
+	switch (speed & VEND1_SPEED_MASK) {
+	case VEND1_SPEED_10000:
+		phydev->speed = SPEED_10000;
+		phydev->duplex = DUPLEX_FULL;
+		break;
+	case VEND1_SPEED_5000:
+		phydev->speed = SPEED_5000;
+		phydev->duplex = DUPLEX_FULL;
+		break;
+	case VEND1_SPEED_2500:
+		phydev->speed = SPEED_2500;
+		phydev->duplex = DUPLEX_FULL;
+		break;
+	case VEND1_SPEED_1000:
+		phydev->speed = SPEED_1000;
+		if (bmcr & BMCR_FULLDPLX)
 			phydev->duplex = DUPLEX_FULL;
-			break;
-		case VEND1_SPEED_10:
-			phydev->speed = SPEED_10;
-			phydev->duplex = DUPLEX_FULL;
-			break;
-		default:
-			return -EINVAL;
-		}
+		else
+			phydev->duplex = DUPLEX_HALF;
+		break;
+	case VEND1_SPEED_100:
+		phydev->speed = SPEED_100;
+		phydev->duplex = DUPLEX_FULL;
+		break;
+	case VEND1_SPEED_10:
+		phydev->speed = SPEED_10;
+		phydev->duplex = DUPLEX_FULL;
+		break;
+	default:
+		return -EINVAL;
 	}
 
+	if (phydev->autoneg == AUTONEG_ENABLE)
+		phy_resolve_aneg_pause(phydev);
+
 	return 0;
 }