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

[ Upstream commit 23d775f12dcd23d052a4927195f15e970e27ab26 ]

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: a3dcb3e7e70c ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index b69bd44ada1f21de58353219ba66372d720e252e..a73008b9e0b3c9e0ad9ccbac1e36bb1e145e3afe 100644 (file)
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -3006,6 +3006,14 @@ static void mv88e6xxx_hardware_reset(struct mv88e6xxx_chip *chip)
 
        /* If there is a GPIO connected to the reset pin, toggle it */
        if (gpiod) {
+               /* If the switch has just been reset and not yet completed
+                * loading EEPROM, the reset may interrupt the I2C transaction
+                * mid-byte, causing the first EEPROM read after the reset
+                * from the wrong location resulting in the switch booting
+                * to wrong mode and inoperable.
+                */
+               mv88e6xxx_g1_wait_eeprom_done(chip);
+
                gpiod_set_value_cansleep(gpiod, 1);
                usleep_range(10000, 20000);
                gpiod_set_value_cansleep(gpiod, 0);