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

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Date:   Wed, 25 Jul 2018 16:27:06 +0200
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     "J, KEERTHY" <j-keerthy@...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, 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).

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