From: Oleksij Rempel <o.rempel@pengutronix.de>
To: "David S. Miller" <davem@davemloft.net>,
Andrew Lunn <andrew@lunn.ch>, Eric Dumazet <edumazet@google.com>,
Florian Fainelli <f.fainelli@gmail.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Vladimir Oltean <olteanv@gmail.com>,
Woojung Huh <woojung.huh@microchip.com>,
Arun Ramadoss <arun.ramadoss@microchip.com>
Cc: "Oleksij Rempel" <o.rempel@pengutronix.de>,
kernel@pengutronix.de, linux-kernel@vger.kernel.org,
netdev@vger.kernel.org, UNGLinuxDriver@microchip.com,
"David Ahern" <dsahern@kernel.org>,
"Simon Horman" <horms@kernel.org>,
"Willem de Bruijn" <willemb@google.com>,
"Søren Andersen" <san@skov.dk>
Subject: [PATCH net v1 1/1] net: dsa: microchip: Correct initialization order for KSZ88x3 ports
Date: Thu, 16 May 2024 09:08:52 +0200 [thread overview]
Message-ID: <20240516070852.1953381-1-o.rempel@pengutronix.de> (raw)
Adjust the initialization sequence of KSZ88x3 switches to enable
802.1p priority control on Port 2 before configuring Port 1. This
change ensures the apptrust functionality on Port 1 operates
correctly, as it depends on the priority settings of Port 2. The
prior initialization sequence incorrectly configured Port 1 first,
which could lead to functional discrepancies.
Fixes: a1ea57710c9d ("net: dsa: microchip: dcb: add special handling for KSZ88X3 family")
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
drivers/net/dsa/microchip/ksz_dcb.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/net/dsa/microchip/ksz_dcb.c b/drivers/net/dsa/microchip/ksz_dcb.c
index a971063275629..19b228b849247 100644
--- a/drivers/net/dsa/microchip/ksz_dcb.c
+++ b/drivers/net/dsa/microchip/ksz_dcb.c
@@ -805,5 +805,18 @@ int ksz_dcb_init(struct ksz_device *dev)
if (ret)
return ret;
+ /* Enable 802.1p priority control on Port 2 during switch initialization.
+ * This setup is critical for the apptrust functionality on Port 1, which
+ * relies on the priority settings of Port 2. Note: Port 1 is naturally
+ * configured before Port 2, necessitating this configuration order.
+ */
+ if (ksz_is_ksz88x3(dev)) {
+ ret = ksz_prmw8(dev, KSZ_PORT_2, KSZ8_REG_PORT_1_CTRL_0,
+ KSZ8_PORT_802_1P_ENABLE,
+ KSZ8_PORT_802_1P_ENABLE);
+ if (ret)
+ return ret;
+ }
+
return 0;
}
--
2.39.2
next reply other threads:[~2024-05-16 7:09 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-16 7:08 Oleksij Rempel [this message]
2024-05-16 7:28 ` [PATCH net v1 1/1] net: dsa: microchip: Correct initialization order for KSZ88x3 ports Hariprasad Kelam
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