smsc911x: add second read of EEPROM mac when possible corruption seen

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[ Upstream commit 69777753a8 ]

When the EEPROM MAC is read by way of ADDRH, it can return all 0s the
first time. Subsequent reads succeed.

This is fully reproduceable on the Phytec PCM049 SOM.

Re-read the ADDRH when this behaviour is observed, in an attempt to
correctly apply the EEPROM MAC address.

Signed-off-by: Colin Foster <colin.foster@in-advantage.com>
Link: https://patch.msgid.link/20250903132610.966787-1-colin.foster@in-advantage.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Colin Foster 2025-09-03 08:26:10 -05:00 • committed by Greg Kroah-Hartman

parent 562bcdc0d7

commit 8cd230920b

1 changed files with 12 additions and 2 deletions

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drivers/net/ethernet/smsc/smsc911x.c

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