linux-kernel - Re: [RFT PATCH 0/4] hwmon: k10temp driver improvements

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Date:   Fri, 17 Jan 2020 10:46:17 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Ondrej Čerman <ocerman@...1.eu>
Cc:     linux-hwmon@...r.kernel.org, Clemens Ladisch <clemens@...isch.de>,
        Jean Delvare <jdelvare@...e.com>, linux-kernel@...r.kernel.org
Subject: Re: [RFT PATCH 0/4] hwmon: k10temp driver improvements

On Fri, Jan 17, 2020 at 10:46:25AM +0100, Ondrej Čerman wrote:
> Dňa 16. 1. 2020 o 15:17 Guenter Roeck napísal(a):
> > This patch series implements various improvements for the k10temp driver.
> > 
> > Patch 1/4 introduces the use of bit operations.
> > 
> > Patch 2/4 converts the driver to use the devm_hwmon_device_register_with_info
> > API. This not only simplifies the code and reduces its size, it also
> > makes the code easier to maintain and enhance.
> > 
> > Patch 3/4 adds support for reporting Core Complex Die (CCD) temperatures
> > on Ryzen 3 (Zen2) CPUs.
> > 
> > Patch 4/4 adds support for reporting core and SoC current and voltage
> > information on Ryzen CPUs.
> > 
> > With all patches in place, output on Ryzen 3900 CPUs looks as follows
> > (with the system under load).
> > 
> > k10temp-pci-00c3
> > Adapter: PCI adapter
> > Vcore:        +1.36 V
> > Vsoc:         +1.18 V
> > Tdie:         +86.8°C  (high = +70.0°C)
> > Tctl:         +86.8°C
> > Tccd1:        +80.0°C
> > Tccd2:        +81.8°C
> > Icore:       +44.14 A
> > Isoc:        +13.83 A
> > 
> > The patch series has only been tested with Ryzen 3900 CPUs. Further test
> > coverage will be necessary before the changes can be applied to the Linux
> > kernel.
> > 
> Hello everyone, I am the author of https://github.com/ocerman/zenpower/ .
> 
> It is nice to see this merged.
> 
> I just want to warn you that there have been reported issues with
> Threadripper CPUs to zenpower issue tracker. Also I think that no-one tested
> EPYC CPUs.
> 
> Most of the stuff I was able to figure out by trial-and-error approach and
> unfortunately because I do not own any Threadripper CPU I was not able to
> test and fix reported problems.
> 
Thanks a lot for the note. The key problem seems to be that Threadripper
doesn't report SoC current and voltage. Is that correct ? If so, that
should be easy to solve.

On a side note, drivers/gpu/drm/amd/include/asic_reg/thm/thm_10_0_offset.h
suggests that two more temperature sensors might be available at 0x0005995C
and 0x00059960 (DIE3_TEMP and SW_TEMP). Have you ever tried that ?

Thanks,
Guenter