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net: dsa: microchip: Correct initialization order for KSZ88x3 ports

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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: a1ea57710c ("net: dsa: microchip: dcb: add special handling for KSZ88X3 family")
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Hariprasad Kelam <hkelam@marvell.com>
Acked-by: Arun Ramadoss <arun.ramadoss@microchip.com>
Link: https://lore.kernel.org/r/20240517050121.2174412-1-o.rempel@pengutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Oleksij Rempel 2024-05-17 07:01:21 +02:00 committed by Jakub Kicinski
parent 31279b0cb4
commit f0fa841164
1 changed files with 10 additions and 0 deletions
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10
drivers/net/dsa/microchip/ksz_dcb.c
View File

@ -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;
}