linux-kernel - Re: [PATCH] arm64: dts: qcom: sm6115: Add CPU idle-states

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Date:   Fri, 3 Mar 2023 02:03:41 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Bhupesh Sharma <bhupesh.sharma@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, agross@...nel.org,
        andersson@...nel.org, linux-kernel@...r.kernel.org,
        bhupesh.linux@...il.com, robh+dt@...nel.org,
        devicetree@...r.kernel.org, krzysztof.kozlowski+dt@...aro.org
Subject: Re: [PATCH] arm64: dts: qcom: sm6115: Add CPU idle-states



On 18.01.2023 21:48, Bhupesh Sharma wrote:
> On Thu, 19 Jan 2023 at 02:10, Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
>>
>>
>>
>> On 18.01.2023 21:34, Bhupesh Sharma wrote:
>>> Add CPU idle-state nodes and power-domains in Qualcomm sm6115 SoC dtsi.
>>>
>>> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
>>> ---
[...]

>>> +
>>> +             domain-idle-states {
>>> +                     CLUSTER_SLEEP_0: cluster-sleep-0 {
>>> +                             compatible = "domain-idle-state";
>>> +                             idle-state-name = "cluster-power-collapse";
>>> +                             arm,psci-suspend-param = <0x41000043>;
>>> +                             entry-latency-us = <800>;
>>> +                             exit-latency-us = <2118>;
>>> +                             min-residency-us = <7376>;
>> These values vary per cluster, see qcom,pm-cluster-level@2 in the
>> file linked above.. We should either split that, or at least take
>> max() of each value between the two nodes to make sure the sleep
>> state is exited properly on both types of cores.
> 
> Ack to both the above observations. Will send a fixed v2 shortly.
In doing so, please also add support for D3G cluster sleep states
as well, it sounds beneficial to have a middleground between a total
power collapse and a simple wfi.

Konrad
> 
> Thanks,
> Bhupesh
> 
>>> +                     };
>>> +             };
>>>       };
>>>
>>>       firmware {
>>> @@ -191,6 +242,59 @@ pmu {
>>>       psci {
>>>               compatible = "arm,psci-1.0";
>>>               method = "smc";
>>> +
>>> +             CPU_PD0: power-domain-cpu0 {
>>> +                     #power-domain-cells = <0>;
>>> +                     power-domains = <&CLUSTER_PD>;
>>> +                     domain-idle-states = <&LITTLE_CPU_SLEEP_0>;
>>> +             };
>>> +
>>> +             CPU_PD1: power-domain-cpu1 {
>>> +                     #power-domain-cells = <0>;
>>> +                     power-domains = <&CLUSTER_PD>;
>>> +                     domain-idle-states = <&LITTLE_CPU_SLEEP_0>;
>>> +             };
>>> +
>>> +             CPU_PD2: power-domain-cpu2 {
>>> +                     #power-domain-cells = <0>;
>>> +                     power-domains = <&CLUSTER_PD>;
>>> +                     domain-idle-states = <&LITTLE_CPU_SLEEP_0>;
>>> +             };
>>> +
>>> +             CPU_PD3: power-domain-cpu3 {
>>> +                     #power-domain-cells = <0>;
>>> +                     power-domains = <&CLUSTER_PD>;
>>> +                     domain-idle-states = <&LITTLE_CPU_SLEEP_0>;
>>> +             };
>>> +
>>> +             CPU_PD4: power-domain-cpu4 {
>>> +                     #power-domain-cells = <0>;
>>> +                     power-domains = <&CLUSTER_PD>;
>>> +                     domain-idle-states = <&BIG_CPU_SLEEP_0>;
>>> +             };
>>> +
>>> +             CPU_PD5: power-domain-cpu5 {
>>> +                     #power-domain-cells = <0>;
>>> +                     power-domains = <&CLUSTER_PD>;
>>> +                     domain-idle-states = <&BIG_CPU_SLEEP_0>;
>>> +             };
>>> +
>>> +             CPU_PD6: power-domain-cpu6 {
>>> +                     #power-domain-cells = <0>;
>>> +                     power-domains = <&CLUSTER_PD>;
>>> +                     domain-idle-states = <&BIG_CPU_SLEEP_0>;
>>> +             };
>>> +
>>> +             CPU_PD7: power-domain-cpu7 {
>>> +                     #power-domain-cells = <0>;
>>> +                     power-domains = <&CLUSTER_PD>;
>>> +                     domain-idle-states = <&BIG_CPU_SLEEP_0>;
>>> +             };
>>> +
>>> +             CLUSTER_PD: power-domain-cpu-cluster0 {
>>> +                     #power-domain-cells = <0>;
>>> +                     domain-idle-states = <&CLUSTER_SLEEP_0>;
>>> +             };
>>>       };
>>>
>>>       reserved_memory: reserved-memory {