i2c: piix4: Disable completely the IMC during SMBUS_BLOCK_DATA

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SMBUS_BLOCK_DATA transactions might fail due to a race condition with
the IMC (Integrated Micro Controller), even when the IMC semaphore
is used.

This bug has been reported and confirmed by AMD, who suggested as a
solution an IMC firmware upgrade (obtained via BIOS update) and
disabling the IMC during SMBUS_BLOCK_DATA transactions.

Even without the IMC upgrade, the SMBUS is much more stable with this
patch.

Tested on a Bettong-alike board.

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

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Ricardo Ribalda Delgado 2017-10-10 18:11:15 +02:00 • committed by Wolfram Sang

parent 0fe16195f8

commit 88fa2dfb07

1 changed files with 126 additions and 6 deletions

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132

drivers/i2c/busses/i2c-piix4.c

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