* i2c-tools does not work with AMD Cezanne APU's
[not found] <CAPoa-_rth53JPWJB-c9hB+PCjyU=MvAHa2Db0h=ghciMgphvgQ@mail.gmail.com>
@ 2022-01-19 1:26 ` Jon P
2022-01-19 10:51 ` Jean Delvare
0 siblings, 1 reply; 2+ messages in thread
From: Jon P @ 2022-01-19 1:26 UTC (permalink / raw)
To: linux-i2c, Jean Delvare, Adam Honse
After updating to a 5700G APU from a 2400G on my B450 board I am not
able to access i2c interfaces which is a blocking issue to use OpenRGB
on the DRAM and motherboard RGB controller (I am one of the developers
of OpenRGB).
I have opened an issue with the distribution that I am using and
multiple other users are seeing the same issue but I have not seen any
updates on the issue or request for more details so I am afraid that
it has just gone into the void. Full details here:
https://bugs.launchpad.net/bugs/1950062
I see the same issues when using the i2c-tools as well when I am
trying to read the DRAM so following the man page I would like to
report a bug using the i2c-tools with AMD Cezanne APU's.
Thanks for looking into this.
Regards, TheRogueZeta
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: i2c-tools does not work with AMD Cezanne APU's
2022-01-19 1:26 ` i2c-tools does not work with AMD Cezanne APU's Jon P
@ 2022-01-19 10:51 ` Jean Delvare
0 siblings, 0 replies; 2+ messages in thread
From: Jean Delvare @ 2022-01-19 10:51 UTC (permalink / raw)
To: Jon P; +Cc: linux-i2c, Adam Honse, Terry Bowman
Hi Jon,
On Tue, 18 Jan 2022 17:26:03 -0800, Jon P wrote:
> After updating to a 5700G APU from a 2400G on my B450 board I am not
> able to access i2c interfaces which is a blocking issue to use OpenRGB
> on the DRAM and motherboard RGB controller (I am one of the developers
> of OpenRGB).
>
> I have opened an issue with the distribution that I am using and
> multiple other users are seeing the same issue but I have not seen any
> updates on the issue or request for more details so I am afraid that
> it has just gone into the void. Full details here:
> https://bugs.launchpad.net/bugs/1950062
>
> I see the same issues when using the i2c-tools as well when I am
> trying to read the DRAM so following the man page I would like to
> report a bug using the i2c-tools with AMD Cezanne APU's.
From your logs, the i2c bus itself is not working. So this is
definitely not an i2c-tools issue, but a kernel driver issue.
Most likely this is related to the required change of register access
method for recent AMD chipsets which has been discussed recently:
https://lore.kernel.org/linux-i2c/20220118221152.300444-1-terry.bowman@amd.com/T/#t
--
Jean Delvare
SUSE L3 Support
^ permalink raw reply [flat|nested] 2+ messages in thread
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2022-01-19 1:26 ` i2c-tools does not work with AMD Cezanne APU's Jon P
2022-01-19 10:51 ` Jean Delvare
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