linux-kernel - [PATCH] i2c: piix4: Add second SMBus for X370/X470/X570

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Date:   Mon, 13 Apr 2020 17:06:34 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Jean Delvare <jdelvare@...e.com>
Cc:     linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sebastian Reichel <sebastian.reichel@...labora.com>,
        Adam Honse <calcprogrammer1@...il.com>
Subject: [PATCH] i2c: piix4: Add second SMBus for X370/X470/X570

The second interface can be found on X370, X470 and X570 according
to the bugzilla entry. I only tested with X570 on an ASRock X570
Taichi:

$ lspci -nnv -d 1022:790b
00:14.0 SMBus [0c05]: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller [1022:790b] (rev 61)
	Subsystem: ASRock Incorporation FCH SMBus Controller [1849:ffff]
	Flags: 66MHz, medium devsel
	Kernel driver in use: piix4_smbus
	Kernel modules: i2c_piix4, sp5100_tco

Before the patch:

$ i2cdetect -l | grep PIIX4
i2c-1	unknown   	SMBus PIIX4 adapter port 2 at 0b00	N/A
i2c-0	unknown   	SMBus PIIX4 adapter port 0 at 0b00	N/A

After the patch:

$ i2cdetect -l | grep PIIX4
i2c-1	unknown   	SMBus PIIX4 adapter port 2 at 0b00	N/A
i2c-2	unknown   	SMBus PIIX4 adapter port 1 at 0b20	N/A
i2c-0	unknown   	SMBus PIIX4 adapter port 0 at 0b00	N/A

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=202587
Reported-by: Adam Honse <calcprogrammer1@...il.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
---
Hi,

The Bugzilla entry contains a second change, which reduces the timeouts
for quicker operation. I did not include that change, since I do not know
if this is a good idea for all devices supported by this driver. In any
case it should be a separate patch. Let's get the interface working for
now.

-- Sebastian
---
 drivers/i2c/busses/i2c-piix4.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c
index 30ded6422e7b..3e89143a0ecf 100644
--- a/drivers/i2c/busses/i2c-piix4.c
+++ b/drivers/i2c/busses/i2c-piix4.c
@@ -976,9 +976,11 @@ 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) {
-		retval = piix4_setup_sb800(dev, id, 1);
+	if (dev->vendor == PCI_VENDOR_ID_AMD) {
+		if (dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS ||
+		    dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS) {
+			retval = piix4_setup_sb800(dev, id, 1);
+		}
 	}
 
 	if (retval > 0) {
-- 
2.25.1