linux-kernel - Re: [PATCH v3 2/3] firmware: add exynos ACPM protocol driver

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Message-ID: <2eedbbe1-6b4c-427b-a369-5b08dc27deaf@linaro.org>
Date: Fri, 6 Dec 2024 20:50:15 +0100
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Tudor Ambarus <tudor.ambarus@...aro.org>, robh@...nel.org,
 krzk+dt@...nel.org, conor+dt@...nel.org, alim.akhtar@...sung.com,
 linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 andre.draszik@...aro.org, kernel-team@...roid.com, willmcvicker@...gle.com,
 peter.griffin@...aro.org, javierm@...hat.com, tzimmermann@...e.de,
 vincent.guittot@...aro.org, ulf.hansson@...aro.org, arnd@...db.de
Subject: Re: [PATCH v3 2/3] firmware: add exynos ACPM protocol driver

On 12/6/24 14:28, Krzysztof Kozlowski wrote:
> On Fri, Dec 06, 2024 at 12:39:56AM +0100, Daniel Lezcano wrote:
>>> +# SPDX-License-Identifier: GPL-2.0-only
>>> +
>>> +config EXYNOS_ACPM_PROTOCOL
>>> +	tristate "Exynos Alive Clock and Power Manager (ACPM) Message Protocol"
>>
>> Given the importance of this driver where a lot of PM services rely on, does
>> it really make sense to allow it as a module ?
>>
>> Some PM services may be needed very early in the boot process
>>
> 
> If it works as module e.g. on Android, it is beneficial. I think the
> platform was booting fine without it, at least to some shell, so I can
> imagine this can be loaded a bit later.

Usually the firmware sets the frequency to the maximum in order to boot 
the kernel as fast as possible. That may lead to thermal issues at boot 
time where the thermal framework won't be able to kick in as some 
components will depends on ACPM while the system stays at its highest 
performance state.


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