From 97ca310aa18a93329ef5cd68c20de89761962f45 Mon Sep 17 00:00:00 2001
From: David Bauer <mail@david-bauer.net>
Date: Sun, 13 Jun 2021 12:19:36 +0200
Subject: [PATCH] net: phy: at803x: fix feature detection

AR8031/AR8033 have different status registers for copper
and fiber operation. However, the extended status register
is the same for both operation modes.

As a result of that, ESTATUS_1000_XFULL is set to 1 even when
operating in copper TP mode.

Remove this mode from the supported link modes, as this driver
currently only supports copper operation.

Signed-off-by: David Bauer <mail@david-bauer.net>
---
 drivers/net/phy/at803x.c | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

--- a/drivers/net/phy/at803x.c
+++ b/drivers/net/phy/at803x.c
@@ -411,6 +411,34 @@ static int at803x_aneg_done(struct phy_d
 	return aneg_done;
 }
 
+static int at803x_get_features(struct phy_device *phydev)
+{
+	int err;
+
+	err = genphy_read_abilities(phydev);
+	if (err)
+		return err;
+
+	if (!(phydev->phy_id & phydev->drv->phy_id_mask) == (ATH8031_PHY_ID & phydev->drv->phy_id_mask))
+		return 0;
+
+	/* AR8031/AR8033 have different status registers
+	 * for copper and fiber operation. However, the
+	 * extended status register is the same for both
+	 * operation modes.
+	 *
+	 * As a result of that, ESTATUS_1000_XFULL is set
+	 * to 1 even when operating in copper TP mode.
+	 *
+	 * Remove this mode from the supported link modes,
+	 * as this driver currently only supports copper
+	 * operation.
+	 */
+	linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
+			   phydev->supported);
+	return 0;
+}
+
 static int at803x_read_status(struct phy_device *phydev)
 {
 	int ss, err, old_link = phydev->link;
@@ -513,7 +541,7 @@ static struct phy_driver at803x_driver[]
 	.resume			= at803x_resume,
 	.read_page		= at803x_read_page,
 	.write_page		= at803x_write_page,
-	/* PHY_GBIT_FEATURES */
+	.get_features		= at803x_get_features,
 	.read_status		= at803x_read_status,
 	.aneg_done		= at803x_aneg_done,
 	.ack_interrupt		= &at803x_ack_interrupt,
