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| /openbmc/linux/drivers/i2c/busses/ |
| H A D | i2c-piix4.c | d46b4ff3 Wed Feb 09 11:27:16 CST 2022 Terry Bowman <terry.bowman@amd.com> i2c: piix4: Add EFCH MMIO support for SMBus port select
commit 381a3083c6747ae5cdbef9b176d57d1b966db49f upstream.
AMD processors include registers capable of selecting between 2 SMBus
ports. Port selection is made during each user access by writing to
FCH::PM::DECODEEN[smbus0sel]. Change the driver to use MMIO during
SMBus port selection because cd6h/cd7h port I/O is not available on
later AMD processors.
Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Cc: Mario Limonciello <Mario.Limonciello@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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