linux-kernel - [PATCH 5.15 075/177] net: dsa: mv88e6xxx: Unforce speed & duplex in mac_link

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Date:   Mon, 20 Dec 2021 15:33:45 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Marek Behún <kabel@...nel.org>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 075/177] net: dsa: mv88e6xxx: Unforce speed & duplex in mac_link_down()

From: Marek Behún <kabel@...nel.org>

[ Upstream commit 9d591fc028b6bddb38c6585874f331267cbdadae ]

Commit 64d47d50be7a ("net: dsa: mv88e6xxx: configure interface settings
in mac_config") removed forcing of speed and duplex from
mv88e6xxx_mac_config(), where the link is forced down, and left it only
in mv88e6xxx_mac_link_up(), by which time link is unforced.

It seems that (at least on 88E6190) when changing cmode to 2500base-x,
if the link is not forced down, but the speed or duplex are still
forced, the forcing of new settings for speed & duplex doesn't take in
mv88e6xxx_mac_link_up().

Fix this by unforcing speed & duplex in mv88e6xxx_mac_link_down().

Fixes: 64d47d50be7a ("net: dsa: mv88e6xxx: configure interface settings in mac_config")
Signed-off-by: Marek Behún <kabel@...nel.org>
Reviewed-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/dsa/mv88e6xxx/chip.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index a31cc0ab7c625..43d126628610b 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -769,6 +769,10 @@ static void mv88e6xxx_mac_link_down(struct dsa_switch *ds, int port,
 	if ((!mv88e6xxx_port_ppu_updates(chip, port) ||
 	     mode == MLO_AN_FIXED) && ops->port_sync_link)
 		err = ops->port_sync_link(chip, port, mode, false);
+
+	if (!err && ops->port_set_speed_duplex)
+		err = ops->port_set_speed_duplex(chip, port, SPEED_UNFORCED,
+						 DUPLEX_UNFORCED);
 	mv88e6xxx_reg_unlock(chip);
 
 	if (err)
-- 
2.33.0