netdev - [PATCH v2] usbnet: asix AX88772: leave the carrier control to phylink

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Message-ID: <m3plhmdfte.fsf_-_@t19.piap.pl>
Date: Tue, 08 Apr 2025 13:59:41 +0200
From: Krzysztof Hałasa <khalasa@...p.pl>
To: Oleksij Rempel <o.rempel@...gutronix.de>
Cc: netdev <netdev@...r.kernel.org>,  Oliver Neukum <oneukum@...e.com>,
  Andrew Lunn <andrew+netdev@...n.ch>,  "David S. Miller"
 <davem@...emloft.net>,  Eric Dumazet <edumazet@...gle.com>,  Jakub
 Kicinski <kuba@...nel.org>,  Paolo Abeni <pabeni@...hat.com>,
  <linux-usb@...r.kernel.org>,  <linux-kernel@...r.kernel.org>,  Jose
 Ignacio Tornos Martinez <jtornosm@...hat.com>,  Ming Lei
 <ming.lei@...hat.com>
Subject: [PATCH v2] usbnet: asix AX88772: leave the carrier control to phylink

ASIX AX88772B based USB 10/100 Ethernet adapter doesn't come
up ("carrier off"), despite the built-in 100BASE-FX PHY positive link
indication. The internal PHY is configured (using EEPROM) in fixed
100 Mbps full duplex mode.

The primary problem appears to be using carrier_netif_{on,off}() while,
at the same time, delegating carrier management to phylink. Use only the
latter and remove "manual control" in the asix driver.

I don't have any other AX88772 board here, but the problem doesn't seem
specific to a particular board or settings - it's probably
timing-dependent.

Remove unused asix_adjust_link() as well.

Signed-off-by: Krzysztof Hałasa <khalasa@...p.pl>

--- a/drivers/net/usb/asix.h
+++ b/drivers/net/usb/asix.h
@@ -224,7 +224,6 @@ int asix_write_rx_ctl(struct usbnet *dev, u16 mode, int in_pm);
 
 u16 asix_read_medium_status(struct usbnet *dev, int in_pm);
 int asix_write_medium_mode(struct usbnet *dev, u16 mode, int in_pm);
-void asix_adjust_link(struct net_device *netdev);
 
 int asix_write_gpio(struct usbnet *dev, u16 value, int sleep, int in_pm);
 
--- a/drivers/net/usb/asix_common.c
+++ b/drivers/net/usb/asix_common.c
@@ -414,28 +414,6 @@ int asix_write_medium_mode(struct usbnet *dev, u16 mode, int in_pm)
 	return ret;
 }
 
-/* set MAC link settings according to information from phylib */
-void asix_adjust_link(struct net_device *netdev)
-{
-	struct phy_device *phydev = netdev->phydev;
-	struct usbnet *dev = netdev_priv(netdev);
-	u16 mode = 0;
-
-	if (phydev->link) {
-		mode = AX88772_MEDIUM_DEFAULT;
-
-		if (phydev->duplex == DUPLEX_HALF)
-			mode &= ~AX_MEDIUM_FD;
-
-		if (phydev->speed != SPEED_100)
-			mode &= ~AX_MEDIUM_PS;
-	}
-
-	asix_write_medium_mode(dev, mode, 0);
-	phy_print_status(phydev);
-	usbnet_link_change(dev, phydev->link, 0);
-}
-
 int asix_write_gpio(struct usbnet *dev, u16 value, int sleep, int in_pm)
 {
 	int ret;
--- a/drivers/net/usb/asix_devices.c
+++ b/drivers/net/usb/asix_devices.c
@@ -752,7 +736,6 @@ static void ax88772_mac_link_down(struct phylink_config *config,
 	struct usbnet *dev = netdev_priv(to_net_dev(config->dev));
 
 	asix_write_medium_mode(dev, 0, 0);
-	usbnet_link_change(dev, false, false);
 }
 
 static void ax88772_mac_link_up(struct phylink_config *config,
@@ -783,7 +766,6 @@ static void ax88772_mac_link_up(struct phylink_config *config,
 		m |= AX_MEDIUM_RFC;
 
 	asix_write_medium_mode(dev, m, 0);
-	usbnet_link_change(dev, true, false);
 }
 
 static const struct phylink_mac_ops ax88772_phylink_mac_ops = {
@@ -1350,10 +1328,9 @@ static const struct driver_info ax88772_info = {
 	.description = "ASIX AX88772 USB 2.0 Ethernet",
 	.bind = ax88772_bind,
 	.unbind = ax88772_unbind,
-	.status = asix_status,
 	.reset = ax88772_reset,
 	.stop = ax88772_stop,
-	.flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_LINK_INTR | FLAG_MULTI_PACKET,
+	.flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_MULTI_PACKET,
 	.rx_fixup = asix_rx_fixup_common,
 	.tx_fixup = asix_tx_fixup,
 };
@@ -1362,11 +1339,9 @@ static const struct driver_info ax88772b_info = {
 	.description = "ASIX AX88772B USB 2.0 Ethernet",
 	.bind = ax88772_bind,
 	.unbind = ax88772_unbind,
-	.status = asix_status,
 	.reset = ax88772_reset,
 	.stop = ax88772_stop,
-	.flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_LINK_INTR |
-	         FLAG_MULTI_PACKET,
+	.flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_MULTI_PACKET,
 	.rx_fixup = asix_rx_fixup_common,
 	.tx_fixup = asix_tx_fixup,
 	.data = FLAG_EEPROM_MAC,
@@ -1376,11 +1351,9 @@ static const struct driver_info lxausb_t1l_info = {
 	.description = "Linux Automation GmbH USB 10Base-T1L",
 	.bind = ax88772_bind,
 	.unbind = ax88772_unbind,
-	.status = asix_status,
 	.reset = ax88772_reset,
 	.stop = ax88772_stop,
-	.flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_LINK_INTR |
-		 FLAG_MULTI_PACKET,
+	.flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_MULTI_PACKET,
 	.rx_fixup = asix_rx_fixup_common,
 	.tx_fixup = asix_tx_fixup,
 	.data = FLAG_EEPROM_MAC,
@@ -1412,10 +1383,8 @@ static const struct driver_info hg20f9_info = {
 	.description = "HG20F9 USB 2.0 Ethernet",
 	.bind = ax88772_bind,
 	.unbind = ax88772_unbind,
-	.status = asix_status,
 	.reset = ax88772_reset,
-	.flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_LINK_INTR |
-	         FLAG_MULTI_PACKET,
+	.flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_MULTI_PACKET,
 	.rx_fixup = asix_rx_fixup_common,
 	.tx_fixup = asix_tx_fixup,
 	.data = FLAG_EEPROM_MAC,

-- 
Krzysztof "Chris" Hałasa

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