linux-kernel - Re: [PATCH] hwmon: (pmbus/ibm-cffps) Do not swap max_power

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Message-ID: <e5916b33-8898-a483-bc69-49a08913672c@roeck-us.net>
Date:   Mon, 30 Aug 2021 08:34:48 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Eddie James <eajames@...ux.ibm.com>,
        Brandon Wyman <bjwyman@...il.com>
Cc:     Joel Stanley <joel@....id.au>, openbmc@...ts.ozlabs.org,
        Jean Delvare <jdelvare@...e.com>, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwmon: (pmbus/ibm-cffps) Do not swap max_power_out

On 8/30/21 6:50 AM, Eddie James wrote:
> On Sat, 2021-08-28 at 08:52 -0700, Guenter Roeck wrote:
>> On Fri, Aug 27, 2021 at 11:04:33PM +0000, Brandon Wyman wrote:
>>> The bytes for max_power_out from the ibm-cffps devices do not need
>>> to be
>>> swapped.
>>>
>>> Signed-off-by: Brandon Wyman <bjwyman@...il.com>
>>
>> Eddie, can you confirm this ?
> 
> This can't be true for all the power supplies supported by this driver,
> no. I think we need to check the version first. Brandon, I tested this
> on witherspoon (which is psu version 1) and get 3148 watts. If it's not
> swapped, that would be 19468 watts...
> 

Hmm. Eddie, can you also have a look at commit 9fed8fa99334 ("hwmon:
(pmbus/ibm-cffps) Fix write bits for LED control") ?
We need to make sure that it doesn't mess up some versions of this PS.

Thanks,
Guenter