linux-kernel - [PATCH net v2 1/1] net: dsa: microchip: Correct initialization order for KSZ88x3 ports

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Date: Fri, 17 May 2024 07:01:21 +0200
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: "David S. Miller" <davem@...emloft.net>,
	Andrew Lunn <andrew@...n.ch>,
	Eric Dumazet <edumazet@...gle.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Vladimir Oltean <olteanv@...il.com>,
	Woojung Huh <woojung.huh@...rochip.com>,
	Arun Ramadoss <arun.ramadoss@...rochip.com>
Cc: Oleksij Rempel <o.rempel@...gutronix.de>,
	Hariprasad Kelam <hkelam@...vell.com>,
	kernel@...gutronix.de,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	UNGLinuxDriver@...rochip.com,
	David Ahern <dsahern@...nel.org>,
	Simon Horman <horms@...nel.org>,
	Willem de Bruijn <willemb@...gle.com>,
	Søren Andersen <san@...v.dk>
Subject: [PATCH net v2 1/1] net: dsa: microchip: Correct initialization order for KSZ88x3 ports

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@...gutronix.de>
Reviewed-by: Hariprasad Kelam <hkelam@...vell.com>
---
 drivers/net/dsa/microchip/ksz_dcb.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/dsa/microchip/ksz_dcb.c b/drivers/net/dsa/microchip/ksz_dcb.c
index a971063275629..086bc9b3cf536 100644
--- a/drivers/net/dsa/microchip/ksz_dcb.c
+++ b/drivers/net/dsa/microchip/ksz_dcb.c
@@ -805,5 +805,15 @@ 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))
+		return ksz_prmw8(dev, KSZ_PORT_2, KSZ8_REG_PORT_1_CTRL_0,
+				 KSZ8_PORT_802_1P_ENABLE,
+				 KSZ8_PORT_802_1P_ENABLE);
+
 	return 0;
 }
-- 
2.39.2