i2c-pasemi messages since kernel 6.16

[Christian Zigotzky]

On 11 August 2025 at 06:12 pm, Sven Peter wrote:
> hi,
> 
> On 10.08.25 18:47, Christian Zigotzky wrote:
>> Hello Sven,
>>
>> Since the kernel 6.16 we have the following messages during the boot.
>>
>> [    9.459706] i2c-pasemi 0000:00:1c.0: NACK, status 0x08210100
>> [    9.649736] i2c-pasemi 0000:00:1c.0: Issuing reset due to status 
>> 0x08210100 (xfstatus 0x00000001)
>> [    9.690696] i2c-pasemi 0000:00:1c.1: NACK, status 0x08210100
>> [    9.708651] i2c-pasemi 0000:00:1c.1: Issuing reset due to status 
>> 0x08210100 (xfstatus 0x00000001)
>> [    9.892693] i2c-pasemi 0000:00:1c.2: NACK, status 0x08210100
>> [    9.911535] i2c-pasemi 0000:00:1c.2: Issuing reset due to status 
>> 0x08210100 (xfstatus 0x00000001)
>>
>> What exactly do these messages mean?
> 
> Do you just see these messages or are there also any other issues like a 
> device on the i2c bus not working anymore when it worked fine before?
> We added some additional logging recently and I suspect that this has 
> always been happening and no one noticed.
> 
> 
> 
> Sven
> 
> 

Hello Sven,

Thank you for your answer.

I just see these messages. There aren't any other issues.

Further information:

$ cat /proc/version
Linux version 6.12.22-powerpc64-smp (geeko at buildhost) 
(powerpc64-suse-linux-gcc (SUSE Linux) 7.5.0, GNU ld (GNU Binutils; 
devel:gcc / SLE-15) 2.43.1.20240828-150300.536) #1 SMP Tue Apr  8 
09:47:26 CEST 2025

$ sudo dmesg | grep -i i2c
[    5.032840] i2c_dev: i2c /dev entries driver
[    5.440998] i2c i2c-9: Detected TI TMP423 chip at 0x4c

$ sudo i2cdetect -l
[sudo] password for christian:
i2c-3	i2c       	Radeon i2c bit bus 0x93         	I2C adapter
i2c-10	i2c       	PA Semi SMBus adapter (0000:00:1c.1)	I2C adapter
i2c-1	i2c       	Radeon i2c bit bus 0x91         	I2C adapter
i2c-8	i2c       	card0-DP-1                      	I2C adapter
i2c-6	i2c       	Radeon i2c bit bus 0x96         	I2C adapter
i2c-4	i2c       	Radeon i2c bit bus 0x94         	I2C adapter
i2c-11	i2c       	PA Semi SMBus adapter (0000:00:1c.2)	I2C adapter
i2c-2	i2c       	Radeon i2c bit bus 0x92         	I2C adapter
i2c-0	i2c       	Radeon i2c bit bus 0x90         	I2C adapter
i2c-9	i2c       	PA Semi SMBus adapter (0000:00:1c.0)	I2C adapter
i2c-7	i2c       	Radeon i2c bit bus 0x97         	I2C adapter
i2c-5	i2c       	Radeon i2c bit bus 0x95         	I2C adapter


$ cat /proc/version
Linux version 6.16.0-powerpc64-smp (geeko at buildhost) 
(powerpc64-suse-linux-gcc (SUSE Linux) 11.5.0, GNU ld (GNU Binutils; 
devel:gcc / SLE-15) 2.43.1.20240828-150300.536) #1 SMP Mon Jul 28 
06:44:21 CEST 2025

$ sudo dmesg | grep -i i2c
[sudo] password for christian:
[    3.381852] i2c_dev: i2c /dev entries driver
[    3.591326] i2c-pasemi 0000:00:1c.0: NACK, status 0x08210100
[    3.604687] i2c-pasemi 0000:00:1c.0: Issuing reset due to status 
0x08210100 (xfstatus 0x00000001)
[    3.623181] i2c i2c-9: Detected TI TMP423 chip at 0x4c
[    3.640313] i2c-pasemi 0000:00:1c.0: NACK, status 0x08210100
[    3.653561] i2c-pasemi 0000:00:1c.0: Issuing reset due to status 
0x08210100 (xfstatus 0x00000001)
[    3.667314] i2c-pasemi 0000:00:1c.0: NACK, status 0x08210100
[    3.680416] i2c-pasemi 0000:00:1c.0: Issuing reset due to status 
0x08210100 (xfstatus 0x00000001)
[    3.694312] i2c-pasemi 0000:00:1c.0: NACK, status 0x08210100
[    3.708309] i2c-pasemi 0000:00:1c.1: NACK, status 0x08210100
[    3.721268] i2c-pasemi 0000:00:1c.1: Issuing reset due to status 
0x08210100 (xfstatus 0x00000001)
[    3.735309] i2c-pasemi 0000:00:1c.1: NACK, status 0x08210100
[    3.748276] i2c-pasemi 0000:00:1c.1: Issuing reset due to status 
0x08210100 (xfstatus 0x00000001)
[    3.762309] i2c-pasemi 0000:00:1c.1: NACK, status 0x08210100
[    3.775289] i2c-pasemi 0000:00:1c.1: Issuing reset due to status 
0x08210100 (xfstatus 0x00000001)
[    3.789309] i2c-pasemi 0000:00:1c.1: NACK, status 0x08210100
[    3.802265] i2c-pasemi 0000:00:1c.1: Issuing reset due to status 
0x08210100 (xfstatus 0x00000001)
[    3.816315] i2c-pasemi 0000:00:1c.1: NACK, status 0x08210100
[    3.830308] i2c-pasemi 0000:00:1c.2: NACK, status 0x08210100
[    3.843392] i2c-pasemi 0000:00:1c.2: Issuing reset due to status 
0x08210100 (xfstatus 0x00000001)
[    3.857308] i2c-pasemi 0000:00:1c.2: NACK, status 0x08210100
[    3.870637] i2c-pasemi 0000:00:1c.2: Issuing reset due to status 
0x08210100 (xfstatus 0x00000001)
[    3.884307] i2c-pasemi 0000:00:1c.2: NACK, status 0x08210100
[    3.897148] i2c-pasemi 0000:00:1c.2: Issuing reset due to status 
0x08210100 (xfstatus 0x00000001)
[    3.911309] i2c-pasemi 0000:00:1c.2: NACK, status 0x08210100
[    3.924874] i2c-pasemi 0000:00:1c.2: Issuing reset due to status 
0x08210100 (xfstatus 0x00000001)
[    3.939307] i2c-pasemi 0000:00:1c.2: NACK, status 0x08210100
[    9.335546] i2c-pasemi 0000:00:1c.0: Issuing reset due to status 
0x08210100 (xfstatus 0x00000001)

sudo i2cdetect -l
[sudo] password for christian:
i2c-3	i2c       	Radeon i2c bit bus 0x93         	I2C adapter
i2c-10	i2c       	PA Semi SMBus adapter (0000:00:1c.1)	I2C adapter
i2c-1	i2c       	Radeon i2c bit bus 0x91         	I2C adapter
i2c-8	i2c       	card0-DP-1                      	I2C adapter
i2c-6	i2c       	Radeon i2c bit bus 0x96         	I2C adapter
i2c-4	i2c       	Radeon i2c bit bus 0x94         	I2C adapter
i2c-11	i2c       	PA Semi SMBus adapter (0000:00:1c.2)	I2C adapter
i2c-2	i2c       	Radeon i2c bit bus 0x92         	I2C adapter
i2c-0	i2c       	Radeon i2c bit bus 0x90         	I2C adapter
i2c-9	i2c       	PA Semi SMBus adapter (0000:00:1c.0)	I2C adapter
i2c-7	i2c       	Radeon i2c bit bus 0x97         	I2C adapter
i2c-5	i2c       	Radeon i2c bit bus 0x95         	I2C adapter

Cheers,
Christian