linux-kernel - spd5118 driver occasionally produces erroneous values

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Message-ID: <CACsxjPbcjDPLVfnVncumKVAL16fgBXr4kUGbH4hW+cZiJTe_0w@mail.gmail.com>
Date: Fri, 21 Nov 2025 00:57:15 +1100
From: ‍小太 <nospam@...a.moe>
To: Guenter Roeck <linux@...ck-us.net>, linux-kernel@...r.kernel.org, 
	linux-hwmon@...r.kernel.org
Subject: spd5118 driver occasionally produces erroneous values

Hello, I have just set up spd5118 for my Asus Pro WS TRX50-SAGE WIFI
motherboard and v-color TRA532G72D834Q RAM

However, I've encountered it occasionally producing unrealistic
temperature values.
See this graph collected over 10 minutes - note the temperature scale:
https://files.catbox.moe/yt8uqp.png

I wonder if this is a known issue with the driver? Or maybe it's some
quirk with my system?
It kind of feels like a race condition...
If I boot Windows and run HWiNFO, it does not exhibit this behaviour

Note that spd5118 does not automatically attach to the I²C devices, so
I have to manually do it

Some details about the system:

kota@...e:/tmp$ sensors spd5118-*
spd5118-i2c-1-50
Adapter: Synopsys DesignWare I2C adapter
DIMM_A1:      +46.2°C  (low  =  +0.0°C, high = +55.0°C)
                       (crit low =  +0.0°C, crit = +85.0°C)

spd5118-i2c-0-50
Adapter: Synopsys DesignWare I2C adapter
DIMM_E1:      +47.0°C  (low  =  +0.0°C, high = +55.0°C)
                       (crit low =  +0.0°C, crit = +85.0°C)

spd5118-i2c-1-52
Adapter: Synopsys DesignWare I2C adapter
DIMM_C1:      +47.0°C  (low  =  +0.0°C, high = +55.0°C)  ALARM (LCRIT)
                       (crit low = +192.0°C, crit = +85.0°C)

spd5118-i2c-0-52
Adapter: Synopsys DesignWare I2C adapter
DIMM_G1:      +48.0°C  (low  =  +0.0°C, high = +55.0°C)
                       (crit low = +15.2°C, crit = +85.0°C)

kota@...e:/tmp$ sudo i2cdetect -l
i2c-0    i2c           Synopsys DesignWare I2C adapter     I2C adapter
i2c-1    i2c           Synopsys DesignWare I2C adapter     I2C adapter
i2c-2    i2c           Synopsys DesignWare I2C adapter     I2C adapter
i2c-3    i2c           Synopsys DesignWare I2C adapter     I2C adapter
i2c-4    smbus         SMBus PIIX4 adapter port 0 at 0b00    SMBus adapter
i2c-5    smbus         SMBus PIIX4 adapter port 2 at 0b00    SMBus adapter
i2c-6    smbus         SMBus PIIX4 adapter port 1 at 0b20    SMBus adapter
...

kota@...e:/tmp$ ls -l /sys/bus/i2c/devices/
total 0
lrwxrwxrwx 1 root root 0 Nov 21 00:02 0-0050 ->
../../../devices/platform/AMDI0010:01/i2c-0/0-0050
lrwxrwxrwx 1 root root 0 Nov 21 00:02 0-0052 ->
../../../devices/platform/AMDI0010:01/i2c-0/0-0052
lrwxrwxrwx 1 root root 0 Nov 21 00:02 1-0050 ->
../../../devices/platform/AMDI0010:02/i2c-1/1-0050
lrwxrwxrwx 1 root root 0 Nov 21 00:02 1-0052 ->
../../../devices/platform/AMDI0010:02/i2c-1/1-0052
lrwxrwxrwx 1 root root 0 Nov 21 00:01 i2c-0 ->
../../../devices/platform/AMDI0010:01/i2c-0
lrwxrwxrwx 1 root root 0 Nov 21 00:01 i2c-1 ->
../../../devices/platform/AMDI0010:02/i2c-1
lrwxrwxrwx 1 root root 0 Nov 21 00:01 i2c-2 ->
../../../devices/platform/AMDI0010:04/i2c-2
lrwxrwxrwx 1 root root 0 Nov 21 00:01 i2c-3 ->
../../../devices/platform/AMDI0010:05/i2c-3
lrwxrwxrwx 1 root root 0 Nov 21 00:02 i2c-4 ->
../../../devices/pci0000:00/0000:00:14.0/i2c-4
lrwxrwxrwx 1 root root 0 Nov 21 00:02 i2c-5 ->
../../../devices/pci0000:00/0000:00:14.0/i2c-5
lrwxrwxrwx 1 root root 0 Nov 21 00:02 i2c-6 ->
../../../devices/pci0000:00/0000:00:14.0/i2c-6
...