linux-kernel - Re: [PATCH 01/14] thermal: ti-soc-thermal: fix TALERT IRQ handling for DRA752

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Date:   Fri, 27 Jul 2018 10:13:51 +0530
From:   Keerthy <j-keerthy@...com>
To:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
CC:     Eduardo Valentin <edubezval@...il.com>,
        Zhang Rui <rui.zhang@...el.com>, <linux-pm@...r.kernel.org>,
        <linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/14] thermal: ti-soc-thermal: fix TALERT IRQ handling
 for DRA752



On Wednesday 25 July 2018 07:57 PM, Bartlomiej Zolnierkiewicz wrote:
> On Wednesday, July 11, 2018 07:49:41 AM J, KEERTHY wrote:
>>
>> On 5/14/2018 5:12 PM, Bartlomiej Zolnierkiewicz wrote:
>>> .report_temperature is not set in dra752_data which
>>> results in temperature updates not being propagated by
>>> ti_bandgap_talert_irq_handler() (it doesn't make much
>>> sense to handle TALERT IRQ without reporting temperature
>>> updates to the thermal core). Fix it.
>>
>> ATM no one is using TALERT as the thermal software polls on the 
>> temperature. No real benefit from TALERT.
>>
>> TALERT is set at different temperature and software polling thresholds 
>> come from Device tree and i believe its best for software to go by 
>> polling and then act on trip points.
> 
> Could you please explain what do you mean by "no one is using
> TALERT"?
> 
> The code in ti_bandgap_probe() sets TALERT thresholds and requests
> IRQ if the TI_BANDGAP_FEATURE_TALERT feature flag is set (and this
> flag is set in omap4460_data, omap4470_data, omap5430_data and
> dra752_data).

The software thresholds and the polling takes care of reducing the
temperature. What i actually meant was we never relied on talert and the
polling takes care of keeping a check on the temperature.

Regards,
Keerthy

> 
> Best regards,
> --
> Bartlomiej Zolnierkiewicz
> Samsung R&D Institute Poland
> Samsung Electronics
>