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net: dsa: microchip: fix KSZ8765 fiber detection

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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: [email protected]
Fixes: 91a98917a8 ("net: dsa: microchip: move switch chip_id detection to ksz_common")
Reviewed-by: Nicolai Buchwitz <[email protected]>
Signed-off-by: Sebastien Royen <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>
This commit is contained in:
Sebastien Royen authored and Jakub Kicinski committed 2026-10-08 10:48:00 -07:00
1 parent b056ca4d37
commit fc13ba44da
1 file changed
+1 -1
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drivers/net/dsa/microchip/ksz_common.h
+1 -1
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@@ -853,7 +853,7 @@ static inline bool ksz_is_sgmii_port(struct ksz_device *dev, int port)
#define KSZ88_FAMILY_ID 0x88
#define KSZ8895_FAMILY_ID 0x95
#define KSZ8_PORT_STATUS_0 0x08
#define KSZ8_PORT_STATUS_0 0x18
#define KSZ8_PORT_FIBER_MODE BIT(7)
#define SW_CHIP_ID_M GENMASK(7, 4)