linux-kernel - Re: [PATCH] thermal/drivers/armada: Use the thermal_zone_get_crit

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Message-ID: <4225f833-0f15-5780-5ef4-4cd9e05eca70@linaro.org>
Date:   Tue, 24 Jan 2023 12:36:22 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     rafael@...nel.org, Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        "open list:THERMAL" <linux-pm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] thermal/drivers/armada: Use the
 thermal_zone_get_crit_temp()

On 24/01/2023 12:04, Miquel Raynal wrote:
> Hi Daniel,
> 
> daniel.lezcano@...aro.org wrote on Wed, 18 Jan 2023 23:26:10 +0100:
> 
>> The driver browses the trip point to find out the critical trip
>> temperature. However the function thermal_zone_get_crit_temp() does
>> already that, so the routine is pointless in the driver.
>>
>> Use thermal_zone_get_crit_temp() instead of inspecting all the trip
>> points.
>>
>> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
>> ---
>>   drivers/thermal/armada_thermal.c | 38 +++++++++++++-------------------
>>   1 file changed, 15 insertions(+), 23 deletions(-)
>>
>> diff --git a/drivers/thermal/armada_thermal.c b/drivers/thermal/armada_thermal.c
>> index db040dbdaa0a..c6d51d8acbf0 100644
>> --- a/drivers/thermal/armada_thermal.c
>> +++ b/drivers/thermal/armada_thermal.c
>> @@ -784,34 +784,26 @@ static int armada_configure_overheat_int(struct armada_thermal_priv *priv,
>>   					 int sensor_id)
>>   {
>>   	/* Retrieve the critical trip point to enable the overheat interrupt */
>> -	struct thermal_trip trip;
>> +	int temperature;
>>   	int ret;
>> -	int i;
>> -
>> -	for (i = 0; i < thermal_zone_get_num_trips(tz); i++) {
>> -
>> -		ret = thermal_zone_get_trip(tz, i, &trip);
>> -		if (ret)
>> -			return ret;
>> -
>> -		if (trip.type != THERMAL_TRIP_CRITICAL)
>> -			continue;
>> -
>> -		ret = armada_select_channel(priv, sensor_id);
>> -		if (ret)
>> -			return ret;
>>   
>> -		armada_set_overheat_thresholds(priv, trip.temperature,
>> -					       trip.hysteresis);
>> -		priv->overheat_sensor = tz;
>> -		priv->interrupt_source = sensor_id;
>> +	ret = thermal_zone_get_crit_temp(tz, &temperature);
>> +	if (ret)
>> +		return ret;
>>   
>> -		armada_enable_overheat_interrupt(priv);
>> +	ret = armada_select_channel(priv, sensor_id);
>> +	if (ret)
>> +		return ret;
>>   
>> -		return 0;
>> -	}
>> +	/*
>> +	 * A critical temperature does not have a hysteresis
>> +	 */
> 
> Makes sense.
> 
> Nit: I would actually put that comment in the commit log rather than
> keeping it in the code, but whatever, that's a nice simplification.

Oh, actually, I added the comment because of the third parameter change 
for armada_set_overheat_thresholds(..., 0);

>> +	armada_set_overheat_thresholds(priv, temperature, 0);

I think it makes sense to keep the comment to clarify why we pass this 
zero temperature argument.



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