net: dsa: lantiq_gswip: handle SPEED_2500 in gswip_port_set_speed()

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The mxl-gsw1xx driver advertises 2500BASE-X on its SGMII port (via
supports_2500m and gsw1xx_phylink_get_caps()), but the shared
gswip_port_set_speed() has no SPEED_2500 case: at 2.5G every field keeps
its initializer, so mdio_phy = 0 pins the MDIO speed override to 10 Mbps
and no data passes.

At the MAC/MDIO level 2500BASE-X is identical to 1 Gbps (same wide GMII
datapath, same speed override); the rate itself is set in the PCS and
SerDes, not here. This matches the boot loader's PHY_ADDR_4 = 0x32A4 for
the 2.5G strap ("1 Gbps or above"), whose SPEED field is
GSWIP_MDIO_PHY_SPEED_G1 (the field has no encoding above G1). Share the
SPEED_1000 arm via a stacked case label. Its mii_cfg value is a no-op
for 2.5G: gswip_mii_mask_cfg() writes it only for the RGMII port
(mii_cfg[SGMII port] == -1), which cannot reach 2.5G anyway.

Cc: stable+noautosel@kernel.org # never worked
Signed-off-by: Jan Havran (Advantech Czech) <havran.jan@email.cz>
Reviewed-by: Daniel Golle <daniel@makrotopia.org>
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/20260907134818.16670-3-havran.jan@email.cz
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Jan Havran (Advantech Czech) 2026-09-07 15:48:17 +02:00 • committed by Jakub Kicinski

parent 40c578ceae

commit 6b597ba4c2

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drivers/net/dsa/lantiq/lantiq_gswip_common.c

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