Patch "dsa: lan9303: Fix mapping between DSA port number and PHY address" has been added to the 6.9-stable tree

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This is a note to let you know that I've just added the patch titled

    dsa: lan9303: Fix mapping between DSA port number and PHY address

to the 6.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     dsa-lan9303-fix-mapping-between-dsa-port-number-and-.patch
and it can be found in the queue-6.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 0307ec007a29a2655254cbfaf6dc31b938d22992
Author: Christian Eggers <ceggers@xxxxxxx>
Date:   Wed Jul 3 16:57:17 2024 +0200

    dsa: lan9303: Fix mapping between DSA port number and PHY address
    
    [ Upstream commit 0005b2dc43f96b93fc5b0850d7ca3f7aeac9129c ]
    
    The 'phy' parameter supplied to lan9303_phy_read/_write was sometimes a
    DSA port number and sometimes a PHY address. This isn't a problem as
    long as they are equal.  But if the external phy_addr_sel_strap pin is
    wired to 'high', the PHY addresses change from 0-1-2 to 1-2-3 (CPU,
    slave0, slave1).  In this case, lan9303_phy_read/_write must translate
    between DSA port numbers and the corresponding PHY address.
    
    Fixes: a1292595e006 ("net: dsa: add new DSA switch driver for the SMSC-LAN9303")
    Signed-off-by: Christian Eggers <ceggers@xxxxxxx>
    Reviewed-by: Michal Kubiak <michal.kubiak@xxxxxxxxx>
    Reviewed-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>
    Reviewed-by: Vladimir Oltean <olteanv@xxxxxxxxx>
    Link: https://patch.msgid.link/20240703145718.19951-1-ceggers@xxxxxxx
    Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/dsa/lan9303-core.c b/drivers/net/dsa/lan9303-core.c
index 666b4d766c005..1f7000f90bb78 100644
--- a/drivers/net/dsa/lan9303-core.c
+++ b/drivers/net/dsa/lan9303-core.c
@@ -1048,31 +1048,31 @@ static int lan9303_get_sset_count(struct dsa_switch *ds, int port, int sset)
 	return ARRAY_SIZE(lan9303_mib);
 }
 
-static int lan9303_phy_read(struct dsa_switch *ds, int phy, int regnum)
+static int lan9303_phy_read(struct dsa_switch *ds, int port, int regnum)
 {
 	struct lan9303 *chip = ds->priv;
 	int phy_base = chip->phy_addr_base;
 
-	if (phy == phy_base)
+	if (port == 0)
 		return lan9303_virt_phy_reg_read(chip, regnum);
-	if (phy > phy_base + 2)
+	if (port > 2)
 		return -ENODEV;
 
-	return chip->ops->phy_read(chip, phy, regnum);
+	return chip->ops->phy_read(chip, phy_base + port, regnum);
 }
 
-static int lan9303_phy_write(struct dsa_switch *ds, int phy, int regnum,
+static int lan9303_phy_write(struct dsa_switch *ds, int port, int regnum,
 			     u16 val)
 {
 	struct lan9303 *chip = ds->priv;
 	int phy_base = chip->phy_addr_base;
 
-	if (phy == phy_base)
+	if (port == 0)
 		return lan9303_virt_phy_reg_write(chip, regnum, val);
-	if (phy > phy_base + 2)
+	if (port > 2)
 		return -ENODEV;
 
-	return chip->ops->phy_write(chip, phy, regnum, val);
+	return chip->ops->phy_write(chip, phy_base + port, regnum, val);
 }
 
 static int lan9303_port_enable(struct dsa_switch *ds, int port,
@@ -1100,7 +1100,7 @@ static void lan9303_port_disable(struct dsa_switch *ds, int port)
 	vlan_vid_del(dsa_port_to_conduit(dp), htons(ETH_P_8021Q), port);
 
 	lan9303_disable_processing_port(chip, port);
-	lan9303_phy_write(ds, chip->phy_addr_base + port, MII_BMCR, BMCR_PDOWN);
+	lan9303_phy_write(ds, port, MII_BMCR, BMCR_PDOWN);
 }
 
 static int lan9303_port_bridge_join(struct dsa_switch *ds, int port,
@@ -1375,8 +1375,6 @@ static const struct dsa_switch_ops lan9303_switch_ops = {
 
 static int lan9303_register_switch(struct lan9303 *chip)
 {
-	int base;
-
 	chip->ds = devm_kzalloc(chip->dev, sizeof(*chip->ds), GFP_KERNEL);
 	if (!chip->ds)
 		return -ENOMEM;
@@ -1386,8 +1384,7 @@ static int lan9303_register_switch(struct lan9303 *chip)
 	chip->ds->priv = chip;
 	chip->ds->ops = &lan9303_switch_ops;
 	chip->ds->phylink_mac_ops = &lan9303_phylink_mac_ops;
-	base = chip->phy_addr_base;
-	chip->ds->phys_mii_mask = GENMASK(LAN9303_NUM_PORTS - 1 + base, base);
+	chip->ds->phys_mii_mask = GENMASK(LAN9303_NUM_PORTS - 1, 0);
 
 	return dsa_register_switch(chip->ds);
 }




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