tree 23eda01b7f362fddaa922b0d80d931d8b4b2a9d3
parent 4d4f527029e290d8e67703409518af9b4a71edb1
author Guenter Roeck <linux@roeck-us.net> 1500162686 -0700
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1509093487 +0200

i2c: piix4: Fix SMBus port selection for AMD Family 17h chips

commit 0fe16195f89173652cf111d7b384941b00c5aabd upstream.

AMD Family 17h uses the KERNCZ SMBus controller. While its documentation
is not publicly available, it is documented in the BIOS and Kernel
Developer’s Guide for AMD Family 15h Models 60h-6Fh Processors.

On this SMBus controller, the port select register is at PMx register
0x02, bit 4:3 (PMx00 register bit 20:19).

Without this patch, the 4 SMBus channels on AMD Family 17h chips are
mirrored and report the same chips on all channels.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>