linux-kernel - Re: [PATCH v2 3/3] thermal/core: Fix thermal trip cross point

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Date:   Tue, 12 Jul 2022 14:30:54 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Lukasz Luba <lukasz.luba@....com>
Cc:     quic_manafm@...cinc.com, rui.zhang@...el.com,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Amit Kucheria <amitk@...nel.org>, rafael@...nel.org
Subject: Re: [PATCH v2 3/3] thermal/core: Fix thermal trip cross point

On 12/07/2022 13:29, Lukasz Luba wrote:

[ ... ]

>> @@ -511,8 +528,13 @@ void thermal_zone_device_update(struct 
>> thermal_zone_device *tz,
>>       tz->notify_event = event;
>> -    for (count = 0; count < tz->trips; count++)
>> -        handle_thermal_trip(tz, count);
>> +    if (tz->last_temperature <= tz->temperature) {
>> +        for (count = 0; count < tz->trips; count++)
>> +            handle_thermal_trip(tz, count);
>> +    } else {
>> +        for (count = tz->prev_trip; count >= 0; count--)
>> +            handle_thermal_trip(tz, count);
>> +    }
> 
> In general the code look good. I have one question, though:
> Is it always true that these trip points coming from the DT
> and parsed in thermal_of_build_thermal_zone() populated by
>      for_each_child_of_node(child, gchild) {
>           thermal_of_populate_trip(gchild, &tz->trips[i++]);
> 
> are always defined in right order in DT?

Hmm, that is a good question. Even if the convention is to put the trip 
point in the ascending order, I don't find any documentation telling it 
is mandatory. Given that I don't feel particularly comfortable to assume 
that is the case.

Perhaps, it would make more sense to build a map of indexes telling the 
order in the trip points and work with it instead.


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