i2c: piix4: Fix probing of reserved ports on AMD Family 16h Model 30h

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Prevent bus timeouts and resets on Family 16h Model 30h by not probing
reserved Ports 3 and 4.

According to the AMD BIOS and Kernel Developer's Guides (BKDG), Port 3
and Port 4 are reserved on the following devices:
 - Family 15h Model 60h-6Fh
 - Family 15h Model 70h-7Fh
 - Family 16h Model 30h-3Fh

Based on earlier work by Andrew Cooks.

Reported-by: Andrew Cooks <andrew.cooks@opengear.com>
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

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Jean Delvare 2019-08-02 14:54:38 +02:00 • committed by Wolfram Sang

parent ba91940356

commit 528d53a159

1 changed files with 13 additions and 3 deletions

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drivers/i2c/busses/i2c-piix4.c

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