linux-kernel - Re: [Regression] dmesg warnings after "i2c: smbus: Support up to 8 SPD EEPROMs"

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Message-ID: <6a8f1302-1905-4bc4-84b0-a00558ebecdb@gmail.com>
Date: Wed, 1 May 2024 11:57:34 +0200
From: Heiner Kallweit <hkallweit1@...il.com>
To: Wolfram Sang <wsa+renesas@...g-engineering.com>,
 Mateusz Jończyk <mat.jonczyk@...pl>,
 Jean Delvare <jdelvare@...e.de>, linux-kernel@...r.kernel.org,
 linux-i2c@...r.kernel.org, ruirui.yang@...ux.dev,
 Wolfram Sang <wsa@...nel.org>
Subject: Re: [Regression] dmesg warnings after "i2c: smbus: Support up to 8
 SPD EEPROMs"

On 01.05.2024 09:27, Wolfram Sang wrote:
> 
> Adding Heiner...
> 
> On Tue, Apr 30, 2024 at 09:39:03PM +0200, Mateusz Jończyk wrote:
>> Hello,
>>
>> I have received a regression report on
>> commit 13e3a512a29001c ("i2c: smbus: Support up to 8 SPD EEPROMs")
>> as I was subscribed to some kernel Bugzilla thread and I'm posting it here
>> to make you aware of it.
>>
>> This thread was
>>
>> Bug 213345 - i801_smbus: Timeout waiting for interrupt, driver can't access SMBus 
>>
>> ruirui.yang@...ux.dev on 2024-04-19 08:22:57 UTC wrote:
>>> I got similar issue on thinkpad X1 gen9 with latest 6.9.0-rc4+
>>> Git bisect the first bad commit is "13e3a512a29001c  i2c: smbus: Support up to 8 SPD EEPROMs
>>> "

Thanks for the report. Repeating what I just commented in bugzilla:

The mentioned commit showed up in 6.8 only, but the problem reports
date back to at least 5.12. Original bug report in bugzilla is from
2021. So I don't think this commit is the culprit.

What is the latest known good kernel version?
How about LTS version 6.6?

>>>
>>> modprobe without param:
>>> [ 1290.401393] i801_smbus 0000:00:1f.4: SPD Write Disable is set
>>> [ 1290.401486] i801_smbus 0000:00:1f.4: SMBus using PCI interrupt
>>> [ 1290.403340] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
>>> [ 1290.403383] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
>>> [ 1290.403410] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
>>> [ 1290.403437] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
>>> [ 1290.403465] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
>>> [ 1290.403492] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
>>> [ 1290.403519] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
>>> [ 1290.403546] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
>>>
>>> with param 
>>> [ 1314.568785] i801_smbus 0000:00:1f.4: Interrupt disabled by user
>>> [ 1314.568837] i801_smbus 0000:00:1f.4: SPD Write Disable is set
>>> [ 1314.568894] i801_smbus 0000:00:1f.4: SMBus using po*lling
>>> [ 1314.570230] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
>>> [ 1314.570257] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
>>> [ 1314.570283] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
>>> [ 1314.570310] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
>>> [ 1314.570336] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
>>> [ 1314.570362] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
>>> [ 1314.570389] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
>>> [ 1314.570415] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
>>
>> Link: https://bugzilla.kernel.org/show_bug.cgi?id=213345
>>
>> The param mentioned was i2c-i801.disable_features=0x10, which disables interrupt usage
>> of this driver.
>>
>> Please decide if this is serious enough to warrant a revert.
>>
>> Greetings,
>> Mateusz
>>
>>
Heiner