netdev - Re: [PATCH net-next 3/3] mlxsw: core: Add support for negative temperature readout

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Message-ID: <20190623162537.GF28942@lunn.ch>
Date:   Sun, 23 Jun 2019 18:25:37 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Vadim Pasternak <vadimp@...lanox.com>
Cc:     Ido Schimmel <idosch@...sch.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Jiri Pirko <jiri@...lanox.com>, mlxsw <mlxsw@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>
Subject: Re: [PATCH net-next 3/3] mlxsw: core: Add support for negative
 temperature readout

> > Why the > 0?
> 
> We don't consider negative temperature for thermal control.

Is this because the thermal control is also broken and does not
support negative values? This is just a workaround papering over the
cracks?

I've worked on some systems where the thermal subsystem has controller
a heater. Mostly industrial systems, extended temperature range, and
you have to make sure the hardware is kept above -25C, otherwise the
DRAM timing goes to pot and the system crashed and froze.

	Andrew