linux-kernel - Re: [PATCH V3] thermal/core/power_allocator: avoid thermal cdev can not be reset

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Message-ID: <6aad180f-410c-5b11-b30b-c7bc02cbe054@linaro.org>
Date:   Fri, 14 Apr 2023 13:12:21 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Di Shen <cindygm567@...il.com>
Cc:     Lukasz Luba <lukasz.luba@....com>, Di Shen <di.shen@...soc.com>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        xuewen.yan@...soc.com, jeson.gao@...soc.com, zhanglyra@...il.com,
        orsonzhai@...il.com, rui.zhang@...el.com, amitk@...nel.org,
        rafael@...nel.org
Subject: Re: [PATCH V3] thermal/core/power_allocator: avoid thermal cdev can
 not be reset

On 13/04/2023 10:40, Di Shen wrote:
> We have discussed this question in patch-v1:
> https://lore.kernel.org/all/f6aaa5f1-495d-a158-14d8-ddb2bffbd9c2@arm.com/
> 
> Simply put, we use the trip_temp in the Android System; set different
> trip_temp for thermal control of different scenarios.

The changes are dealing with the trip points and trying to detect the 
threshold. That part should be handled in the thermal core or thermal 
trip side, not in the governor.

AFAICT, if a trip point is changed, then the power allocator should be 
reset, including the cdev state.

It would be more convenient to add an ops to the governor ops structure 
to reset the governor and then call it when a trip point is changed in 
thermal_zone_set_trip()


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