From: Lukasz Luba <lukasz.luba@arm.com>
To: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Di Shen <di.shen@unisoc.com>,
linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org,
xuewen.yan@unisoc.com, jeson.gao@unisoc.com, zhanglyra@gmail.com,
orsonzhai@gmail.com, rui.zhang@intel.com, amitk@kernel.org,
rafael@kernel.org, Di Shen <cindygm567@gmail.com>
Subject: Re: [PATCH V3] thermal/core/power_allocator: avoid thermal cdev can not be reset
Date: Fri, 14 Apr 2023 16:21:01 +0100 [thread overview]
Message-ID: <6022d391-9ae8-2bb4-0f81-2c99466dc556@arm.com> (raw)
In-Reply-To: <ce9b3b01-e496-9e02-5583-41893b7154c7@linaro.org>
On 4/14/23 16:06, Daniel Lezcano wrote:
> On 14/04/2023 16:18, Lukasz Luba wrote:
>>
>>
>> On 4/14/23 12:12, Daniel Lezcano wrote:
>>> 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()
>>>
>>>
>>
>> Sounds reasonable to have a proper API and fwk handling this corner
>> case scenario.
>> Although, if there is a need for a 'easy-to-backport' fix for IPA only,
>> I agree with this patch, since it's straight forward to put in some
>> Android kernel. We can later fix the framework to handle this properly.
>> Anyway, both ways are OK to me.
>
> Unfortunately, we can not do the maintenance of the Linux kernel based
> on an 'easy-to-backport' policy to Android.
>
> This patch could be applied from-list to Android as a hotfix. But for
> Linux the fix should be more elaborated. One solution is to add a
> 'reset' ops and call it from the trip point update function.
Fair enough.
>
> Did you double check the issue is not impacting the other governors too ?
No, unfortunately, I haven't checked other governors.
next prev parent reply other threads:[~2023-04-14 15:21 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-20 9:56 [PATCH V3] thermal/core/power_allocator: avoid thermal cdev can not be reset Di Shen
2023-03-20 12:24 ` Lukasz Luba
2023-04-10 2:09 ` Di Shen
2023-04-10 19:51 ` Daniel Lezcano
2023-04-11 7:17 ` Lukasz Luba
2023-04-13 4:51 ` Di Shen
2023-04-13 7:37 ` Daniel Lezcano
2023-04-13 8:40 ` Di Shen
2023-04-14 11:12 ` Daniel Lezcano
2023-04-14 14:18 ` Lukasz Luba
2023-04-14 15:06 ` Daniel Lezcano
2023-04-14 15:21 ` Lukasz Luba [this message]
2023-05-25 6:39 ` Di Shen
2023-06-19 6:35 ` [PATCH V4] thermal/core/power_allocator: reset thermal governor when trip point is changed Di Shen
2023-06-20 9:46 ` Rafael J. Wysocki
2023-06-20 10:07 ` Rafael J. Wysocki
2023-06-20 10:20 ` Lukasz Luba
2023-06-20 10:39 ` Rafael J. Wysocki
2023-06-20 11:56 ` Lukasz Luba
2023-06-22 18:27 ` Rafael J. Wysocki
2023-06-23 7:43 ` Lukasz Luba
2023-06-23 16:55 ` Rafael J. Wysocki
2023-06-23 17:34 ` Lukasz Luba
2023-06-25 8:40 ` Di Shen
2023-06-25 8:39 ` Di Shen
2023-06-26 7:45 ` Lukasz Luba
2023-06-20 10:38 ` Lukasz Luba
2023-06-21 4:51 ` Di Shen
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