linux-kernel - Re: [PATCH] of-thermal: Disable polling when interrupt property is found in DT

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Message-ID: <5da6a33b.1c69fb81.64cc.6834@mx.google.com>
Date:   Tue, 15 Oct 2019 21:57:30 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Amit Kucheria <amit.kucheria@...aro.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Eduardo Valentin <edubezval@...il.com>,
        Zhang Rui <rui.zhang@...el.com>, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     linux-pm@...r.kernel.org
Subject: Re: [PATCH] of-thermal: Disable polling when interrupt property is found in DT

Quoting Amit Kucheria (2019-10-15 16:13:16)
> Currently, in order to enable interrupt-only mode, one must set
> polling-delay-passive and polling-delay properties in the DT to 0,
> otherwise the thermal framework will continue to setup a periodic timers
> to monitor the thermal zones.
> 
> Change the behaviour, so that on DT-based systems, we no longer have to
> set the properties to zero if we find an 'interrupt' property in the
> sensor.
> 
> Following data shows the number of times
> thermal_zone_device_set_polling() is invoked with and without this
> patch. So the patch achieves the same behaviour as setting the delay
> properties to 0.
> 
> Current behaviour (without setting delay properties to 0):
>   FUNC                              COUNT
>   thermal_zone_device_update          302
>   thermal_zone_device_set_pollin     7911

thermal_zone_device_set_polling?

> 
> Current behaviour (with delay properties set to 0):
>   FUNC                              COUNT
>   thermal_zone_device_update            3
>   thermal_zone_device_set_pollin        6
> 
> With this patch (without setting delay properties to 0):
>   FUNC                              COUNT
>   thermal_zone_device_update            3
>   thermal_zone_device_set_pollin        6
> 
> Suggested-by: Stephen Boyd <swboyd@...omium.org>
> Signed-off-by: Amit Kucheria <amit.kucheria@...aro.org>
> ---

Reviewed-by: Stephen Boyd <swboyd@...omium.org>