net: lan743x: fix SGMII detection on PCI1xxxx B0+ during warm reset

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A warm reset on boards using an EEPROM-only strap configuration (where
no MAC address is set in the image) can cause the driver to incorrectly
revert to RGMII mode. This occurs because the ENET_CONFIG_LOAD_STARTED
bit may not persist or behave as expected.

Update pci11x1x_strap_get_status() to use revision-specific validation:

- For PCI11x1x A0: Continue using the legacy check (config load started
  or reset protection) to validate the SGMII strap.
- For PCI11x1x B0 and later: Use the newly available
  STRAP_READ_USE_SGMII_EN_ bit in the upper strap register to validate
  the lower SGMII_EN bit.

This ensures the SGMII interface is correctly identified even after a
warm reboot.

Signed-off-by: Thangaraj Samynathan <thangaraj.s@microchip.com>
Link: https://patch.msgid.link/20260318063228.17110-1-thangaraj.s@microchip.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

...

This commit is contained in:

Thangaraj Samynathan 2026-03-18 12:02:28 +05:30 • committed by Jakub Kicinski

parent 64cf4b95de

commit e783e40fb6

2 changed files with 12 additions and 4 deletions

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15

drivers/net/ethernet/microchip/lan743x_main.c

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1

drivers/net/ethernet/microchip/lan743x_main.h

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