netdev - [PATCH 1/2] net: dsa: mv88e6xxx: fix marvell 6350 switch probing

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Date: Wed, 22 Nov 2023 23:19:44 +1000
From: Greg Ungerer <gerg@...nel.org>
To: rmk+kernel@...linux.org.uk,
	andrew@...n.ch,
	hkallweit1@...il.com
Cc: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	netdev@...r.kernel.org,
	Greg Ungerer <gerg@...nel.org>
Subject: [PATCH 1/2] net: dsa: mv88e6xxx: fix marvell 6350 switch probing

As of commit de5c9bf40c45 ("net: phylink: require supported_interfaces to
be filled") Marvell 88e6350 switches fail to be probed:

    ...
    mv88e6085 d0072004.mdio-mii:11: switch 0x3710 detected: Marvell 88E6350, revision 2
    mv88e6085 d0072004.mdio-mii:11: phylink: error: empty supported_interfaces
    error creating PHYLINK: -22
    mv88e6085: probe of d0072004.mdio-mii:11 failed with error -22
    ...

The problem stems from the use of mv88e6185_phylink_get_caps() to get
the device capabilities. Create a new dedicated phylink_get_caps for the
6350 to support its more different set of capabilities. Unfortunately the
6352 switch capabilities cannot be re-used due to their support of a SERDES
lane.

The Marvell 88e6351 switch is a slightly improved version of the 6350,
but is mostly identical. It will also need the dedicated 6350 function,
so update its phylink_get_caps as well.

Fixes: de5c9bf40c45 ("net: phylink: require supported_interfaces to be filled")
Signed-off-by: Greg Ungerer <gerg@...nel.org>
---
 drivers/net/dsa/mv88e6xxx/chip.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 42b1acaca33a..e9adf9711c09 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -577,6 +577,18 @@ static void mv88e6250_phylink_get_caps(struct mv88e6xxx_chip *chip, int port,
 	config->mac_capabilities = MAC_SYM_PAUSE | MAC_10 | MAC_100;
 }
 
+static void mv88e6350_phylink_get_caps(struct mv88e6xxx_chip *chip, int port,
+				       struct phylink_config *config)
+{
+	unsigned long *supported = config->supported_interfaces;
+
+	/* Translate the default cmode */
+	mv88e6xxx_translate_cmode(chip->ports[port].cmode, supported);
+
+	config->mac_capabilities = MAC_SYM_PAUSE | MAC_10 | MAC_100 |
+				   MAC_1000FD;
+}
+
 static int mv88e6352_get_port4_serdes_cmode(struct mv88e6xxx_chip *chip)
 {
 	u16 reg, val;
@@ -5069,7 +5081,7 @@ static const struct mv88e6xxx_ops mv88e6350_ops = {
 	.vtu_loadpurge = mv88e6352_g1_vtu_loadpurge,
 	.stu_getnext = mv88e6352_g1_stu_getnext,
 	.stu_loadpurge = mv88e6352_g1_stu_loadpurge,
-	.phylink_get_caps = mv88e6185_phylink_get_caps,
+	.phylink_get_caps = mv88e6350_phylink_get_caps,
 };
 
 static const struct mv88e6xxx_ops mv88e6351_ops = {
@@ -5117,7 +5129,7 @@ static const struct mv88e6xxx_ops mv88e6351_ops = {
 	.stu_loadpurge = mv88e6352_g1_stu_loadpurge,
 	.avb_ops = &mv88e6352_avb_ops,
 	.ptp_ops = &mv88e6352_ptp_ops,
-	.phylink_get_caps = mv88e6185_phylink_get_caps,
+	.phylink_get_caps = mv88e6350_phylink_get_caps,
 };
 
 static const struct mv88e6xxx_ops mv88e6352_ops = {
-- 
2.25.1