[PATCH v3] net: dsa: mv88e6xxx: support RGMII cmode

Marcus Carlberg
2022-08-22T14:42:08Z

Since the probe defaults all interfaces to the highest speed possible
(10GBASE-X in mv88e6393x) before the phy mode configuration from the
devicetree is considered it is currently impossible to use port 0 in
RGMII mode.

This change will allow RGMII modes to be configurable for port 0
enabling port 0 to be configured as RGMII as well as serial depending
on configuration.

Fixes: de776d0d316f ("net: dsa: mv88e6xxx: add support for mv88e6393x family")
Signed-off-by: Marcus Carlberg <marcus.carlberg@axis.com>
---

Notes:
v2: add phy mode input validation for SERDES only ports

v3: add RGMII phy interface types to supported phy modes list.
add fixes tag.

drivers/net/dsa/mv88e6xxx/chip.c | 8 ++++++++
drivers/net/dsa/mv88e6xxx/port.c | 19 +++++++++++++++++++
2 files changed, 27 insertions(+)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 07e9a4da924c..6403f1f8bdbb 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -816,6 +816,14 @@ static void mv88e6393x_phylink_get_caps(struct mv88e6xxx_chip *chip, int port,
MAC_10000FD;
}
}
+
+ if (port == 0) {
+ __set_bit(PHY_INTERFACE_MODE_RMII, supported);
+ __set_bit(PHY_INTERFACE_MODE_RGMII, supported);
+ __set_bit(PHY_INTERFACE_MODE_RGMII_ID, supported);
+ __set_bit(PHY_INTERFACE_MODE_RGMII_RXID, supported);
+ __set_bit(PHY_INTERFACE_MODE_RGMII_TXID, supported);
+ }
}

static void mv88e6xxx_get_caps(struct dsa_switch *ds, int port,
diff --git a/drivers/net/dsa/mv88e6xxx/port.c b/drivers/net/dsa/mv88e6xxx/port.c
index 90c55f23b7c9..5c4195c635b0 100644
--- a/drivers/net/dsa/mv88e6xxx/port.c
+++ b/drivers/net/dsa/mv88e6xxx/port.c
@@ -517,6 +517,12 @@ static int mv88e6xxx_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
case PHY_INTERFACE_MODE_RMII:
cmode = MV88E6XXX_PORT_STS_CMODE_RMII;
break;
+ case PHY_INTERFACE_MODE_RGMII:
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ case PHY_INTERFACE_MODE_RGMII_RXID:
+ case PHY_INTERFACE_MODE_RGMII_TXID:
+ cmode = MV88E6XXX_PORT_STS_CMODE_RGMII;
+ break;
case PHY_INTERFACE_MODE_1000BASEX:
cmode = MV88E6XXX_PORT_STS_CMODE_1000BASEX;
break;
@@ -634,6 +640,19 @@ int mv88e6393x_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
if (port != 0 && port != 9 && port != 10)
return -EOPNOTSUPP;

+ if (port == 9 || port == 10) {
+ switch (mode) {
+ case PHY_INTERFACE_MODE_RMII:
+ case PHY_INTERFACE_MODE_RGMII:
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ case PHY_INTERFACE_MODE_RGMII_RXID:
+ case PHY_INTERFACE_MODE_RGMII_TXID:
+ return -EINVAL;
+ default:
+ break;
+ }
+ }
+
/* mv88e6393x errata 4.5: EEE should be disabled on SERDES ports */
err = mv88e6xxx_port_read(chip, port, MV88E6XXX_PORT_MAC_CTL, &reg);
if (err)
--
2.20.1