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Erdem

Member

From: Istabul

Registered: 2012-03-15

Posts: 5

Website

Cezanne APU i2c issue

Hi, I have issues with reaching my I2C devices with my latest CPU.
Everything is fine with my old Ryzen 1700 CPU, but after upgrading to Ryzen 5700G APU, I can't reach i2c buses at CPU part.

Indeed it shows at i2c-3 to 5 but all query results :

i2c i2c-3: Failed! (ff)

lines at dmesg...

[death@Ryzen ~]$ i2cdetect -l
i2c-0    i2c           AMDGPU DM i2c hw bus 0              I2C adapter
i2c-1    i2c           AMDGPU DM i2c hw bus 1              I2C adapter
i2c-2    i2c           AMDGPU DM i2c hw bus 2              I2C adapter
i2c-3    smbus         SMBus PIIX4 adapter port 0 at ff00    SMBus adapter
i2c-4    smbus         SMBus PIIX4 adapter port 2 at ff00    SMBus adapter
i2c-5    smbus         SMBus PIIX4 adapter port 1 at ff20    SMBus adapter

I make previous research and found that:
https://lore.kernel.org/linux-i2c/20220 … n@amd.com/

But I think those patches are included into 5.18. And I am using linux-5.18.5.arch1-1-x86_64 kernel right now.
Any ideas?

Last edited by Erdem (2022-06-18 01:18:15)

Erdem

Member

From: Istabul

Registered: 2012-03-15

Posts: 5

Website

Re: Cezanne APU i2c issue

Found the issue: dkms has a special piix4 driver...

Last edited by Erdem (2022-06-29 01:05:33)