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/openbmc/linux/drivers/i2c/busses/ |
H A D | i2c-piix4.c | 88fa2dfb Tue Oct 10 11:11:15 CDT 2017 Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> i2c: piix4: Disable completely the IMC during SMBUS_BLOCK_DATA
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> 88fa2dfb Tue Oct 10 11:11:15 CDT 2017 Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> i2c: piix4: Disable completely the IMC during SMBUS_BLOCK_DATA 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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