linux-kernel - Re: [PATCH v1 06/11] thermal/drivers/ti: Use fixed update interval

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Date:   Tue, 7 Mar 2023 21:00:47 +0530
From:   "Gole, Dhruva" <d-gole@...com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>, <rafael@...nel.org>
CC:     <rui.zhang@...el.com>, <amitk@...nel.org>,
        Keerthy <j-keerthy@...com>,
        Eduardo Valentin <edubezval@...il.com>,
        "open list:TI BANDGAP AND THERMAL DRIVER" <linux-pm@...r.kernel.org>,
        "open list:TI BANDGAP AND THERMAL DRIVER" 
        <linux-omap@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 06/11] thermal/drivers/ti: Use fixed update interval


On 3/7/2023 7:07 PM, Daniel Lezcano wrote:
> Currently the TI thermal driver sets the sensor update interval based
> on the polling of the thermal zone. In order to get the polling rate,
> the code inspects the thermal zone device strcuture internals, thus
> breaking the self-encapsulation of the thermal framework core
> framework.
>
> On the other side, we see the common polling rates set in the device
> tree for the platforms using this driver are 500 or 1000 ms.
>
> Setting the polling rate to 250 ms would be far enough to cover the
> combination we found in the device tree.
>
> Instead of accessing the thermal zone device structure polling rate,
> let's use a common update interval of 250 ms for the driver.
>
> Cc: Keerthy <j-keerthy@...com>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> ---
>  drivers/thermal/ti-soc-thermal/ti-thermal-common.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/thermal/ti-soc-thermal/ti-thermal-common.c b/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
> index 0c8914017c18..430c4b43151f 100644
> --- a/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
> +++ b/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
> @@ -23,6 +23,8 @@
>  #include "ti-bandgap.h"
>  #include "../thermal_hwmon.h"
>  
> +#define TI_BANDGAP_UPDATE_INTERVAL_MS 250
> +
>  /* common data structures */
>  struct ti_thermal_data {
>  	struct cpufreq_policy *policy;
> @@ -159,7 +161,6 @@ int ti_thermal_expose_sensor(struct ti_bandgap *bgp, int id,
>  			     char *domain)
>  {
>  	struct ti_thermal_data *data;
> -	int interval;
>  
>  	data = ti_bandgap_get_sensor_data(bgp, id);
>  
> @@ -177,10 +178,9 @@ int ti_thermal_expose_sensor(struct ti_bandgap *bgp, int id,
>  		return PTR_ERR(data->ti_thermal);
>  	}
>  
> -	interval = jiffies_to_msecs(data->ti_thermal->polling_delay_jiffies);
> -
>  	ti_bandgap_set_sensor_data(bgp, id, data);
> -	ti_bandgap_write_update_interval(bgp, data->sensor_id, interval);
> +	ti_bandgap_write_update_interval(bgp, data->sensor_id,
> +					 TI_BANDGAP_UPDATE_INTERVAL_MS);
Reviewed-by: Dhruva Gole <d-gole@...com>
>  
>  	if (devm_thermal_add_hwmon_sysfs(bgp->dev, data->ti_thermal))
>  		dev_warn(bgp->dev, "failed to add hwmon sysfs attributes\n");

-- 
Regards,
Dhruva Gole <d-gole@...com>