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Message-ID: <20240906133951.3433788-4-niklas.soderlund+renesas@ragnatech.se>
Date: Fri, 6 Sep 2024 15:39:51 +0200
From: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
To: Andrew Lunn <andrew@...n.ch>,
Heiner Kallweit <hkallweit1@...il.com>,
Russell King <linux@...linux.org.uk>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Stefan Eichenberger <eichest@...il.com>,
Dimitri Fedrau <dima.fedrau@...il.com>,
Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
netdev@...r.kernel.org
Cc: linux-renesas-soc@...r.kernel.org,
Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
Subject: [net-next 3/3] net: phy: marvell-88q2xxx: Enable auto negotiation for mv88q2110
The initial marvell-88q2xxx driver only supported the Marvell 88Q2110
PHY without auto negotiation support. The reason documented states that
the provided initialization sequence did not to work. Now a method to
enable auto negotiation have been found by comparing the initialization
of other supported devices and an out-of-tree PHY driver.
Perform the minimal needed initialization of the PHY to get auto
negotiation working and remove the limitation that disables the auto
negotiation feature for the mv88q2110 device.
With this change a 1000Mbps full duplex link is able to be negotiated
between two mv88q2110 and the link works perfectly. The other side also
reflects the manually configure settings of the master device.
# ethtool eth0
Settings for eth0:
Supported ports: [ ]
Supported link modes: 100baseT1/Full
1000baseT1/Full
Supported pause frame use: Symmetric Receive-only
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 100baseT1/Full
1000baseT1/Full
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Link partner advertised link modes: 100baseT1/Full
1000baseT1/Full
Link partner advertised pause frame use: No
Link partner advertised auto-negotiation: Yes
Link partner advertised FEC modes: Not reported
Speed: 1000Mb/s
Duplex: Full
Auto-negotiation: on
master-slave cfg: preferred master
master-slave status: slave
Port: Twisted Pair
PHYAD: 0
Transceiver: external
MDI-X: Unknown
Link detected: yes
SQI: 15/15
Before this change I was not able to manually configure 1000Mbps link,
only a 100Mpps link so this change providers an improvement in
performance for this device.
[ 5] local 10.1.0.2 port 5201 connected to 10.1.0.1 port 38346
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 96.8 MBytes 812 Mbits/sec 0 469 KBytes
[ 5] 1.00-2.00 sec 94.3 MBytes 791 Mbits/sec 0 469 KBytes
[ 5] 2.00-3.00 sec 96.1 MBytes 806 Mbits/sec 0 469 KBytes
[ 5] 3.00-4.00 sec 98.3 MBytes 825 Mbits/sec 0 469 KBytes
[ 5] 4.00-5.00 sec 98.4 MBytes 825 Mbits/sec 0 469 KBytes
[ 5] 5.00-6.00 sec 98.4 MBytes 826 Mbits/sec 0 469 KBytes
[ 5] 6.00-7.00 sec 98.9 MBytes 830 Mbits/sec 0 469 KBytes
[ 5] 7.00-8.00 sec 91.7 MBytes 769 Mbits/sec 0 469 KBytes
[ 5] 8.00-9.00 sec 99.4 MBytes 834 Mbits/sec 0 747 KBytes
[ 5] 9.00-10.00 sec 101 MBytes 851 Mbits/sec 0 747 KBytes
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
---
drivers/net/phy/marvell-88q2xxx.c | 46 ++++++++++++++++++++++++-------
1 file changed, 36 insertions(+), 10 deletions(-)
diff --git a/drivers/net/phy/marvell-88q2xxx.c b/drivers/net/phy/marvell-88q2xxx.c
index 31f8c976e387..5107f58338af 100644
--- a/drivers/net/phy/marvell-88q2xxx.c
+++ b/drivers/net/phy/marvell-88q2xxx.c
@@ -101,6 +101,22 @@ struct mmd_val {
u16 val;
};
+static const struct mmd_val mv88q2110_init_seq0[] = {
+ { MDIO_MMD_PCS, 0xffe4, 0x07b5 },
+ { MDIO_MMD_PCS, 0xffe4, 0x06b6 },
+};
+
+static const struct mmd_val mv88q2110_init_seq1[] = {
+ { MDIO_MMD_PCS, 0xffde, 0x402f },
+ { MDIO_MMD_PCS, 0xfe34, 0x4040 },
+ { MDIO_MMD_PCS, 0xfe2a, 0x3c1d },
+ { MDIO_MMD_PCS, 0xfe34, 0x0040 },
+ { MDIO_MMD_AN, 0x8032, 0x0064 },
+ { MDIO_MMD_AN, 0x8031, 0x0a01 },
+ { MDIO_MMD_AN, 0x8031, 0x0c01 },
+ { MDIO_MMD_PCS, 0xffdb, 0x0010 },
+};
+
static const struct mmd_val mv88q222x_revb0_init_seq0[] = {
{ MDIO_MMD_PCS, 0x8033, 0x6801 },
{ MDIO_MMD_AN, MDIO_AN_T1_CTRL, 0x0 },
@@ -424,15 +440,6 @@ static int mv88q2xxx_get_features(struct phy_device *phydev)
if (ret)
return ret;
- /* The PHY signalizes it supports autonegotiation. Unfortunately, so
- * far it was not possible to get a link even when following the init
- * sequence provided by Marvell. Disable it for now until a proper
- * workaround is found or a new PHY revision is released.
- */
- if (phydev->drv->phy_id == MARVELL_PHY_ID_88Q2110)
- linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
- phydev->supported);
-
return 0;
}
@@ -739,6 +746,25 @@ static int mv88q2xxx_probe(struct phy_device *phydev)
return mv88q2xxx_hwmon_probe(phydev);
}
+static int mv88q2110_config_init(struct phy_device *phydev)
+{
+ int ret;
+
+ ret = mv88q2xxx_write_mmd_vals(phydev, mv88q2110_init_seq0,
+ ARRAY_SIZE(mv88q2110_init_seq0));
+ if (ret < 0)
+ return ret;
+
+ usleep_range(5000, 10000);
+
+ ret = mv88q2xxx_write_mmd_vals(phydev, mv88q2110_init_seq1,
+ ARRAY_SIZE(mv88q2110_init_seq1));
+ if (ret < 0)
+ return ret;
+
+ return mv88q2xxx_config_init(phydev);
+}
+
static int mv88q222x_revb0_config_init(struct phy_device *phydev)
{
int ret;
@@ -880,7 +906,7 @@ static struct phy_driver mv88q2xxx_driver[] = {
.name = "mv88q2110",
.get_features = mv88q2xxx_get_features,
.config_aneg = mv88q2xxx_config_aneg,
- .config_init = mv88q2xxx_config_init,
+ .config_init = mv88q2110_config_init,
.read_status = mv88q2xxx_read_status,
.soft_reset = mv88q2xxx_soft_reset,
.set_loopback = genphy_c45_loopback,
--
2.46.0
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