From f27237c174fd9653033330e4e532cd9d153ce824 Mon Sep 17 00:00:00 2001
From: Adam Honse <calcprogrammer1@gmail.com>
Date: Fri, 10 Apr 2020 15:48:44 -0500
Subject: [PATCH] i2c: piix4: Detect secondary SMBus controller on AMD AM4 chipsets
Git-commit: f27237c174fd9653033330e4e532cd9d153ce824
Patch-mainline: v5.8-rc1
References: git-fixes
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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/i2c/busses/i2c-piix4.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
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);
}
--
2.26.2