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| author | Adam Honse <calcprogrammer1@gmail.com> | 2020-04-10 22:48:44 +0200 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2020-04-15 12:22:52 +0200 |
| commit | f27237c174fd9653033330e4e532cd9d153ce824 (patch) | |
| tree | 49e3e80c5c4944a2157adfd6a99778cdfe4c662e /drivers/i2c | |
| parent | i2c: busses: convert to devm_platform_get_and_ioremap_resource (diff) | |
| download | linux-f27237c174fd9653033330e4e532cd9d153ce824.tar.xz linux-f27237c174fd9653033330e4e532cd9d153ce824.zip | |
i2c: piix4: Detect secondary SMBus controller on AMD AM4 chipsets
The AMD X370 and other AM4 chipsets (A/B/X 3/4/5 parts) and Threadripper
equivalents have a secondary SMBus controller at I/O port address
0x0B20. This bus is used by several manufacturers to control
motherboard RGB lighting via embedded controllers. I have been using
this bus in my OpenRGB project to control the Aura RGB on many
motherboards and ASRock also uses this bus for their Polychrome RGB
controller.
I am not aware of any CZ-compatible platforms which do not have the
second SMBus channel. All of AMD's AM4- and Threadripper- series
chipsets that OpenRGB users have tested appear to have this secondary
bus. I also noticed this secondary bus is present on older AMD
platforms including my FM1 home server.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=202587
Signed-off-by: Adam Honse <calcprogrammer1@gmail.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Tested-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-piix4.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c index 30ded6422e7b..69740a4ff1db 100644 --- a/drivers/i2c/busses/i2c-piix4.c +++ b/drivers/i2c/busses/i2c-piix4.c @@ -977,7 +977,8 @@ static int piix4_probe(struct pci_dev *dev, const struct pci_device_id *id) } if (dev->vendor == PCI_VENDOR_ID_AMD && - dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS) { + (dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS || + dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS)) { retval = piix4_setup_sb800(dev, id, 1); } |