net: dsa: mv88e6xxx: Wait for EEPROM done before HW reset

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If the switch is reset during active EEPROM transactions, as in
just after an SoC reset after power up, the I2C bus transaction
may be cut short leaving the EEPROM internal I2C state machine
in the wrong state.  When the switch is reset again, the bad
state machine state may result in data being read from the wrong
memory location causing the switch to enter unexpected mode
rendering it inoperational.

Fixes: a3dcb3e7e7 ("net: dsa: mv88e6xxx: Wait for EEPROM done after HW reset")
Signed-off-by: Alfred Lee <l00g33k@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20230815001323.24739-1-l00g33k@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Alfred Lee 2023-08-14 17:13:23 -07:00 • committed by Jakub Kicinski

parent de4c5efeec

commit 23d775f12d

1 changed files with 8 additions and 0 deletions

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drivers/net/dsa/mv88e6xxx/chip.c

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