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

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Message-ID: <f38dd1e6-8eb0-42ef-a539-d1bce195a554@molgen.mpg.de>
Date: Wed, 19 Jun 2024 00:59:15 +0200
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: Guenter Roeck <linux@...ck-us.net>
Cc: linux-kernel@...r.kernel.org,
 Wolfram Sang <wsa+renesas@...g-engineering.com>,
 René Rebe <rene@...ctcode.de>,
 Thomas Weißschuh <linux@...ssschuh.net>,
 Armin Wolf <W_Armin@....de>, 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 Kallweit]


Dear Guenter,


Thank you for your support and trying all these things without having 
such a system at hand.

Am 19.06.24 um 00:37 schrieb Guenter Roeck:

> On 6/18/24 14:45, Paul Menzel wrote:

>> Am 18.06.24 um 23:08 schrieb Guenter Roeck:
>>
>>> On 6/18/24 13:37, Paul Menzel wrote:
>>> [ ... ]
>>>> Unfortunately, it still fails:
>>>>
>>>>      $ git log --no-decorate --oneline -4
>>>>      7ddcff2d44ae3 hwmon: (spd5118) Add support for Renesas/ITD SPD5118 hub controllers
>>>>      e89136743324f hwmon: (spd5118) Use spd5118 specific read/write operations
>>>>      0fcc7279f0cc4 hwmon: (spd5118) Use regmap to implement paging
>>>>      801b6aad6fa7a hwmon: (spd5118) Add configuration option for auto-detection
>>>>
>>>>      $ uname -r
>>>>      6.10.0-rc4.mx64.461-00050-g7ddcff2d44ae
>>>>      $ sudo bash -c 'echo 56000 > /sys/class/hwmon/hwmon3/temp1_max'
>>>>      bash: line 1: echo: write error: No such device or address
>>>
>>> Now I am really baffled. I don't think we could do anything simpler
>>> than that.
>>>
>>> Please try
>>>      sudo i2cset -y -f 0 0x50 0x21 0x06
>>>
>>> That should update the critical temperature from 85 degrees C
>>> 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).
>>
>> Bad news:
>>
>>      $ sudo LD_LIBRARY_PATH=~/src/i2c-tools/lib tools/i2cset -y -f 0 0x50 0x21 0x06
>>      Error: Write failed
> 
> I wonder if there is some write protect active in your system.

Not that I know of.

> I don't see anything in the spd5118 specification, though, or in the
> i801 datasheet. I really don't know what else we could try, sorry.
> Unfortunately I don't have a system with Intel CPU, much less one
> with DDR5, so I won't be able to play with this myself and/or 
> determine if there is something special with your system, or if this
> is a generic problem with i801 controllers.
> 
> Let's hope that we get some feedback from others.

Thank you and kind regards,

Paul