From: Andrew Lunn <andrew@lunn.ch>
To: netdev-maintainers <edumazet@google.com>, <kuba@kernel.org>,
<pabeni@redhat.com>, <davem@davemloft.net>
Cc: Vladimir Oltean <vladimir.oltean@nxp.com>,
netdev <netdev@vger.kernel.org>, Andrew Lunn <andrew@lunn.ch>,
stable@vger.kernel.org,
Tim Menninger <tmenninger@purestorage.com>
Subject: [PATCH net v1] net: dsa: mv88e6xxx: Make unsupported C45 reads return 0xffff
Date: Sat, 20 Jan 2024 20:21:25 +0100 [thread overview]
Message-ID: <20240120192125.1340857-1-andrew@lunn.ch> (raw)
When there is no device on the bus for a given address, the pull up
resistor on the data line results in the read returning 0xffff. The
phylib core code understands this when scanning for devices on the
bus, and a number of MDIO bus masters make use of this as a way to
indicate they cannot perform the read.
Make us of this as a minimal fix for stable where the mv88e6xxx
returns EOPNOTSUPP when the hardware does not support C45, but phylib
interprets this as a fatal error, which it should not be.
Cc: stable@vger.kernel.org
Reported-by: Tim Menninger <tmenninger@purestorage.com>
Fixes: 1a136ca2e089 ("net: mdio: scan bus based on bus capabilities for C22 and C45")
Fixes: da099a7fb13d ("net: phy: Remove probe_capabilities")
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
---
drivers/net/dsa/mv88e6xxx/chip.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 383b3c4d6f59..614cabb5c1b0 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -3659,7 +3659,7 @@ static int mv88e6xxx_mdio_read_c45(struct mii_bus *bus, int phy, int devad,
int err;
if (!chip->info->ops->phy_read_c45)
- return -EOPNOTSUPP;
+ return 0xffff;
mv88e6xxx_reg_lock(chip);
err = chip->info->ops->phy_read_c45(chip, bus, phy, devad, reg, &val);
--
2.43.0
next reply other threads:[~2024-01-20 19:22 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-20 19:21 Andrew Lunn [this message]
2024-01-22 12:24 ` [PATCH net v1] net: dsa: mv88e6xxx: Make unsupported C45 reads return 0xffff Vladimir Oltean
2024-01-22 12:29 ` Vladimir Oltean
2024-01-22 12:52 ` Vladimir Oltean
2024-01-22 13:39 ` Andrew Lunn
2024-01-22 20:44 ` Tim Menninger
2024-01-22 23:01 ` Andrew Lunn
2024-01-23 15:27 ` Tim Menninger
2024-01-23 22:59 ` Andrew Lunn
2024-01-24 15:59 ` Tim Menninger
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