linux-kernel - Re: [PATCH v5 3/3] ARM: tegra: Add thermal reset (thermtrip) support to PMC

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Message-ID: <54AC05A5.5040401@kapsi.fi>
Date:	Tue, 06 Jan 2015 17:56:21 +0200
From:	Mikko Perttunen <mikko.perttunen@...si.fi>
To:	Thierry Reding <thierry.reding@...il.com>
CC:	swarren@...dotorg.org, gnurou@...il.com,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-tegra@...r.kernel.org, wni@...dia.com,
	Mikko Perttunen <mperttunen@...dia.com>
Subject: Re: [PATCH v5 3/3] ARM: tegra: Add thermal reset (thermtrip) support
 to PMC

On 01/06/2015 05:14 PM, Thierry Reding wrote:
> On Tue, Jan 06, 2015 at 12:52:58PM +0200, Mikko Perttunen wrote:
>> From: Mikko Perttunen <mperttunen@...dia.com>
>>
>> This adds a device tree controlled option to enable PMC-based
>> thermal reset in overheating situations. Thermtrip is supported on
>> Tegra30, Tegra114 and Tegra124. The thermal reset only works when
>> the thermal sensors are calibrated, so a soctherm driver is also
>> required.
>>
>> The thermtrip event is triggered by the soctherm block, and all
>> soctherm sensors default to showing a temperature of zero Celsius
>> before they are initialized. Because of this, it is safe to initialize
>> thermtrip and soctherm in any order.
>>
>> Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
>> ---
>>   drivers/soc/tegra/pmc.c | 107 ++++++++++++++++++++++++++++++++++++++++++++++++
>>   1 file changed, 107 insertions(+)
>
> This looks good to me. I'm not sure if I asked before, but can this be
> tested? Can we somehow trick thermtrip into reporting a temperature that
> would trigger this?
>
> Thierry
>

Yep, you can find a program here: 
https://gist.github.com/cyndis/66126c9c176b5f94a76f

It sets the thermtrip threshold to zero degrees.

Mikko

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