linux-kernel - Re: [PATCH v8 1/5] cpuidle: qcom_spm: Detach state machine from main SPM handling

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Message-ID: <f688b8b4-4fdb-4497-22db-920bd67d255e@linaro.org>
Date:   Sat, 14 Aug 2021 12:46:02 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>, rjw@...ysocki.net
Cc:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, phone-devel@...r.kernel.org,
        konrad.dybcio@...ainline.org, marijn.suijten@...ainline.org,
        martin.botka@...ainline.org, jeffrey.l.hugo@...il.com,
        jami.kettunen@...ainline.org,
        ~postmarketos/upstreaming@...ts.sr.ht, devicetree@...r.kernel.org,
        stephan@...hold.net, robh@...nel.org, bartosz.dudziak@...jp.pl
Subject: Re: [PATCH v8 1/5] cpuidle: qcom_spm: Detach state machine from main
 SPM handling

On 05/08/2021 00:56, Bjorn Andersson wrote:
> On Thu 29 Jul 10:56 CDT 2021, AngeloGioacchino Del Regno wrote:
> 
>> In commit a871be6b8eee ("cpuidle: Convert Qualcomm SPM driver to a generic
>> CPUidle driver") the SPM driver has been converted to a
>> generic CPUidle driver: that was mainly made to simplify the
>> driver and that was a great accomplishment;
>> Though, at that time, this driver was only applicable to ARM 32-bit SoCs,
>> lacking logic about the handling of newer generation SAW.
>>
>> In preparation for the enablement of SPM features on AArch64/ARM64,
>> split the cpuidle-qcom-spm driver in two: the CPUIdle related
>> state machine (currently used only on ARM SoCs) stays there, while
>> the SPM communication handling lands back in soc/qcom/spm.c and
>> also making sure to not discard the simplifications that were
>> introduced in the aforementioned commit.
>>
>> Since now the "two drivers" are split, the SCM dependency in the
>> main SPM handling is gone and for this reason it was also possible
>> to move the SPM initialization early: this will also make sure that
>> whenever the SAW CPUIdle driver is getting initialized, the SPM
>> driver will be ready to do the job.
>>
>> Please note that the anticipation of the SPM initialization was
>> also done to optimize the boot times on platforms that have their
>> CPU/L2 idle states managed by other means (such as PSCI), while
>> needing SAW initialization for other purposes, like AVS control.
>>
>> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
>> Reviewed-by: Stephan Gerhold <stephan@...hold.net>
>> Tested-by: Stephan Gerhold <stephan@...hold.net>
> 
> Rafael, Daniel, any objections to me picking this patch through the qcom
> tree?
> 

Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>



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