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| author | Sebastien Royen <sebastien.royen@armadeus.com> | 2026-10-07 10:05:57 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2026-10-08 10:48:00 -0700 |
| commit | fc13ba44da197a186f2f4d77c5b7d73d0f99f053 (patch) | |
| tree | 34babcea535b1596fa74dfa8a282074450f4b0fb /tools/lib/python/kdoc | |
| parent | b056ca4d3742d0769f91137bb1ce3215428398f7 (diff) | |
| download | linux-next-fc13ba44da197a186f2f4d77c5b7d73d0f99f053.tar.gz linux-next-fc13ba44da197a186f2f4d77c5b7d73d0f99f053.zip | |
net: dsa: microchip: fix KSZ8765 fiber detection
The KSZ8765 is similar to the KSZ8795 but has two fiber ports.
KSZ8_PORT_STATUS_0 is used to detect fiber mode. It is currently
defined as 0x08, which is the Global Control 6 MIB Control register
and has bit 7 defined as Flush Counter.
Set KSZ8_PORT_STATUS_0 to 0x18, which is the Port 1 Status 0 register
where bit 7 is the Fiber Mode bit.
This issue was discovered when upgrading an embedded device from kernel
5.10 to 6.16. The device was using a KSZ8765 device tree configuration
and the corresponding hardware, but during boot the kernel incorrectly
detected it as a KSZ8795. The relevant boot messages were:
ksz-switch spi0.0: found switch: KSZ8795, rev 0
ksz-switch spi0.0: Device tree specifies chip KSZ8765 but found KSZ8795, please fix it!
Cc: stable@vger.kernel.org
Fixes: 91a98917a883 ("net: dsa: microchip: move switch chip_id detection to ksz_common")
Reviewed-by: Nicolai Buchwitz <nb@tipi-net.de>
Signed-off-by: Sebastien Royen <sebastien.royen@armadeus.com>
Link: https://patch.msgid.link/20261007080557.15719-1-sebastien.royen@armadeus.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'tools/lib/python/kdoc')
0 files changed, 0 insertions, 0 deletions