netdev - [PATCH net-next] net: dsa: mv88e6xxx: fix mdio bus' phy

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Message-Id: <20230319140238.9470-1-kabel@kernel.org>
Date:   Sun, 19 Mar 2023 15:02:38 +0100
From:   Marek Behún <kabel@...nel.org>
To:     netdev@...r.kernel.org
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Vladimir Oltean <olteanv@...il.com>,
        Klaus Kudielka <klaus.kudielka@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Marek Behún <kabel@...nel.org>
Subject: [PATCH net-next] net: dsa: mv88e6xxx: fix mdio bus' phy_mask member

Commit 2c7e46edbd03 ("net: dsa: mv88e6xxx: mask apparently non-existing
phys during probing") added non-trivial bus->phy_mask in
mv88e6xxx_mdio_register() in order to avoid excessive mdio bus
transactions during probing.

But the mask is incorrect for switches with non-zero phy_base_addr (such
as 88E6341).

Fix this.

Fixes: 2c7e46edbd03 ("net: dsa: mv88e6xxx: mask apparently non-existing phys during probing")
Signed-off-by: Marek Behún <kabel@...nel.org>
---
I was unable to test this now, so this change needs testing.
---
 drivers/net/dsa/mv88e6xxx/chip.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 260e38c5c6e6..b73d1d6747b7 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -3805,7 +3805,9 @@ static int mv88e6xxx_mdio_register(struct mv88e6xxx_chip *chip,
 	bus->read_c45 = mv88e6xxx_mdio_read_c45;
 	bus->write_c45 = mv88e6xxx_mdio_write_c45;
 	bus->parent = chip->dev;
-	bus->phy_mask = GENMASK(31, mv88e6xxx_num_ports(chip));
+	bus->phy_mask = ~GENMASK(chip->info->phy_base_addr +
+				 mv88e6xxx_num_ports(chip) - 1,
+				 chip->info->phy_base_addr);
 
 	if (!external) {
 		err = mv88e6xxx_g2_irq_mdio_setup(chip, bus);
-- 
2.39.2