linux-kernel - Re: [PATCH v4 5/6] i2c: smbus: Support DDR5 SPD EEPROMs

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Message-ID: <342dae24-56c5-4b81-9591-dc23ddbb2806@roeck-us.net>
Date: Tue, 18 Jun 2024 12:31:44 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Paul Menzel <pmenzel@...gen.mpg.de>
Cc: linux-hwmon@...r.kernel.org, linux-i2c@...r.kernel.org,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 Krzysztof Kozlowski <krzk+dt@...nel.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>
Subject: Re: [PATCH v4 5/6] i2c: smbus: Support DDR5 SPD EEPROMs

On 6/18/24 11:59, Paul Menzel wrote:
> Dear Guenter,
> 
> 
> Am 18.06.24 um 20:16 schrieb Guenter Roeck:
>> On 6/18/24 08:25, Paul Menzel wrote:
> 
>>> Am 18.06.24 um 17:10 schrieb Guenter Roeck:
>>>> On 6/18/24 07:59, Paul Menzel wrote:
>>>> [ ... ]
>>>>
>>>>> I did
>>>>>
>>>>>      $ tail -3 /etc/sensors3.conf
>>>>>      chip "spd5118-*"
>>>>>          set temp1_max 56000
>>>>>          set temp1_crit 84000
>>>>>
>>>>> but it stays with the defaults:
>>>>>
>>>>> ```
>>>>> $ sensors
>>>>> spd5118-i2c-0-53
>>>>> Adapter: SMBus I801 adapter at efa0
>>>>> temp1:        +20.8°C  (low  =  +0.0°C, high = +55.0°C)
>>>>>                         (crit low =  +0.0°C, crit = +85.0°C)
>>>>>
>>>>
>>>> You'd have to write directly into the attribute files.
>>>> For example, if you have
>>>>
>>>> $ grep . /sys/class/hwmon/*/name
>>>> /sys/class/hwmon/hwmon0/name:nvme
>>>> /sys/class/hwmon/hwmon1/name:nct6687
>>>> /sys/class/hwmon/hwmon2/name:k10temp
>>>> /sys/class/hwmon/hwmon3/name:spd5118
>>>> /sys/class/hwmon/hwmon4/name:spd5118
>>>> /sys/class/hwmon/hwmon5/name:spd5118
>>>> /sys/class/hwmon/hwmon6/name:spd5118
>>>> /sys/class/hwmon/hwmon7/name:mt7921_phy0
>>>> /sys/class/hwmon/hwmon8/name:amdgpu
>>>>
>>>> you could run
>>>>
>>>> sudo bash -c 'echo 56000 > /sys/class/hwmon/hwmon3/temp1_max'
>>>
>>>      $ sudo bash -c 'echo 56000 > /sys/class/hwmon/hwmon3/temp1_max'
>>>      bash: line 1: echo: write error: No such device or address
>>>
>>
>> Please add
>>
>>      .use_single_write = true,
>>
>> to the regmap configuration (spd5118_regmap_config) to see if it helps.
> 
> Unfortunately, it does not:
> 
>      $ git log --no-decorate -p -1
>      commit c27ae51b689d7bdb7baf10c434438d501bd384aa
>      Author: Paul Menzel <pmenzel@...gen.mpg.de>
>      Date:   Tue Jun 18 20:26:17 2024 +0200
> 
>          hwmon: spd5118: Use .use_single_write = true,
> 
>      diff --git a/drivers/hwmon/spd5118.c b/drivers/hwmon/spd5118.c
>      index ac94a67793605..33a628840597e 100644
>      --- a/drivers/hwmon/spd5118.c
>      +++ b/drivers/hwmon/spd5118.c
>      @@ -522,6 +522,7 @@ static const struct regmap_config spd5118_regmap_config = {
>              .writeable_reg = spd5118_writeable_reg,
>              .volatile_reg = spd5118_volatile_reg,
>              .cache_type = REGCACHE_MAPLE,
>      +       .use_single_write = true,
>       };
> 
>       static int spd5118_probe(struct i2c_client *client)
> 
>      $ uname -r
>      6.10.0-rc4.mx64.461-00048-gc27ae51b689d
>      $ sudo bash -c 'echo 56000 > /sys/class/hwmon/hwmon3/temp1_max'
>      bash: line 1: echo: write error: No such device or address
> 
> 

Too bad. Still, thanks for trying!

I have a more comprehensive patch series which I think _should_ work.
I'll send it out for testing shortly.

Thanks,
Guenter