net: macb: runtime detect MACB_CAPS_USRIO_DISABLED

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DCFG1 (design config 1 register) carries a bit indicating whether User
I/O feature has been enabled or not. The MACB/GEM driver has a cap flag
indicating that HW has the feature disabled (default is enabled). Add
the missing connection between DCFG1 bit and MACB_CAPS_USRIO_DISABLED.

Indirect impact: avoid useless writel() on USERIO register; this is not
an important fix because USERIO is anyway read-only when feature is
disabled.

If for some reason a compatible sets USRIO_DISABLED but DCFG1 indicates
it is enabled, we still keep the disabled capability flag. This ensures
we don't break "cdns,np4-macb" that sets the flag from compatible match
data.

Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20260325-compactly-glue-f426a2e68904@spud
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Théo Lebrun 2026-03-25 16:28:16 +00:00 • committed by Jakub Kicinski

parent 41adda8764

commit 47c86c4636

2 changed files with 4 additions and 0 deletions

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2

drivers/net/ethernet/cadence/macb.h

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2

drivers/net/ethernet/cadence/macb_main.c

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