linux-kernel - Re: [RFT PATCH v2 2/3] hwmon: (spd5118) Use spd5118 specific read/write operations

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Message-ID: <6845cc2d-c50b-415b-af49-bf57333ee939@molgen.mpg.de>
Date: Wed, 19 Jun 2024 01:39:57 +0200
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: Armin Wolf <W_Armin@....de>, Guenter Roeck <linux@...ck-us.net>
Cc: Wolfram Sang <wsa+renesas@...g-engineering.com>,
 linux-kernel@...r.kernel.org, René Rebe
 <rene@...ctcode.de>, Thomas Weißschuh
 <linux@...ssschuh.net>, Stephen Horvath <s.horvath@...look.com.au>,
 Sasha Kozachuk <skozachuk@...gle.com>, John Hamrick <johnham@...gle.com>,
 Chris Sarra <chrissarra@...gle.com>, linux-hwmon@...r.kernel.org,
 Jean Delvare <jdelvare@...e.com>, Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [RFT PATCH v2 2/3] hwmon: (spd5118) Use spd5118 specific
 read/write operations

[Cc: +Heiner]


Dear Armin,


Am 19.06.24 um 01:28 schrieb Armin Wolf:
> Am 19.06.24 um 00:28 schrieb Wolfram Sang:
> 
>>> to 86 degrees C. If that doesn't work, we'll be really out of luck
>>> with that controller (or at least I don't have an idea what else to 
>>> try).
>> 
>> Try CCing Heiner Kallweit for ideas about the i801 controller.

> i am not Heiner Kallweit, but i found something interesting in
> commit ba9ad2af7019 ("i2c: i801: Fix I2C Block Read on 8-Series/C220 and 
> later").
> 
> Basically, it seems that the i802 i2c controller indeed features a SPD 
> write disable bit which blocks all writes for slave addresses 0x50-0x57.
> 
> Does the i801 i2c controller driver print something like "SPD Write 
> Disable is set" during boot?

Nice find. Yes, it does:

     [    5.462605] i801_smbus 0000:00:1f.4: SPD Write Disable is set
     [    5.468399] i801_smbus 0000:00:1f.4: SMBus using PCI interrupt


Kind regards,

Paul