linux-kernel - Re: [PATCH v2] hwmon: Driver for temperature sensors on SATA drives

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Message-ID: <CACRpkdYU7ZDcKp+BbXRCnEFDw1xwDkU_vXsfo-AZNUWGEVknXQ@mail.gmail.com>
Date:   Sun, 12 Jan 2020 12:21:49 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Gabriel C <nix.or.die@...il.com>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-hwmon@...r.kernel.org, Jean Delvare <jdelvare@...e.com>,
        Bart Van Assche <bvanassche@....org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-scsi <linux-scsi@...r.kernel.org>,
        "open list:LIBATA SUBSYSTEM (Serial and Parallel ATA drivers)" 
        <linux-ide@...r.kernel.org>, Chris Healy <cphealy@...il.com>
Subject: Re: [PATCH v2] hwmon: Driver for temperature sensors on SATA drives

On Sun, Jan 12, 2020 at 12:18 PM Gabriel C <nix.or.die@...il.com> wrote:

> What I've noticed however is the nvme temperature low/high values on
> the Sensors X are strange here.
(...)
> Sensor 1:     +27.9°C  (low  = -273.1°C, high = +65261.8°C)
> Sensor 2:     +29.9°C  (low  = -273.1°C, high = +65261.8°C)
(...)
> Sensor 1:     +23.9°C  (low  = -273.1°C, high = +65261.8°C)
> Sensor 2:     +25.9°C  (low  = -273.1°C, high = +65261.8°C)

That doesn't look strange to me. It seems like reasonable defaults
from the firmware if either it doesn't really log the min/max temperatures
or hasn't been through a cycle of updating these yet. Just set both
to absolute min/max temperatures possible.

Yours,
Linus Walleij