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Message-ID: <CAH=2NtzPReiUHuEAW8PsQJvNzOYvb71pZ7SWRbThWdLT7_a0ug@mail.gmail.com>
Date: Sat, 1 Apr 2023 23:56:07 +0530
From: Bhupesh Sharma <bhupesh.sharma@...aro.org>
To: Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: linux-arm-msm@...r.kernel.org, agross@...nel.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
andersson@...nel.org, bhupesh.linux@...il.com,
krzysztof.kozlowski@...aro.org, robh+dt@...nel.org
Subject: Re: [RESEND PATCH v2 1/1] arm64: dts: qcom: sm6115: Add CPU idle-states
Hi Konrad,
On Sat, 1 Apr 2023 at 17:51, Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
>
>
>
> On 30.03.2023 21:33, 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>
> > ---
> > Changes since v1:
> > - v1 can be viewed here: https://lore.kernel.org/lkml/e5cda4cf-5c2a-a7ed-9e1d-1fe9f2cbef40@linaro.org
> > - Addressed Konrad's comments on v1 and added GDHS and Power Collapse
> > cluster power states.
> >
> > arch/arm64/boot/dts/qcom/sm6115.dtsi | 136 +++++++++++++++++++++++++++
> > 1 file changed, 136 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/qcom/sm6115.dtsi b/arch/arm64/boot/dts/qcom/sm6115.dtsi
> > index 2a51c938bbcb..b63395d476ed 100644
> > --- a/arch/arm64/boot/dts/qcom/sm6115.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sm6115.dtsi
> > @@ -45,6 +45,8 @@ CPU0: cpu@0 {
> > enable-method = "psci";
> > next-level-cache = <&L2_0>;
> > qcom,freq-domain = <&cpufreq_hw 0>;
> > + power-domains = <&CPU_PD0>;
> > + power-domain-names = "psci";
> > L2_0: l2-cache {
> > compatible = "cache";
> > cache-level = <2>;
> > @@ -61,6 +63,8 @@ CPU1: cpu@1 {
> > enable-method = "psci";
> > next-level-cache = <&L2_0>;
> > qcom,freq-domain = <&cpufreq_hw 0>;
> > + power-domains = <&CPU_PD1>;
> > + power-domain-names = "psci";
> > };
> >
> > CPU2: cpu@2 {
> > @@ -73,6 +77,8 @@ CPU2: cpu@2 {
> > enable-method = "psci";
> > next-level-cache = <&L2_0>;
> > qcom,freq-domain = <&cpufreq_hw 0>;
> > + power-domains = <&CPU_PD2>;
> > + power-domain-names = "psci";
> > };
> >
> > CPU3: cpu@3 {
> > @@ -85,6 +91,8 @@ CPU3: cpu@3 {
> > enable-method = "psci";
> > next-level-cache = <&L2_0>;
> > qcom,freq-domain = <&cpufreq_hw 0>;
> > + power-domains = <&CPU_PD3>;
> > + power-domain-names = "psci";
> > };
> >
> > CPU4: cpu@100 {
> > @@ -97,6 +105,8 @@ CPU4: cpu@100 {
> > dynamic-power-coefficient = <282>;
> > next-level-cache = <&L2_1>;
> > qcom,freq-domain = <&cpufreq_hw 1>;
> > + power-domains = <&CPU_PD4>;
> > + power-domain-names = "psci";
> > L2_1: l2-cache {
> > compatible = "cache";
> > cache-level = <2>;
> > @@ -113,6 +123,8 @@ CPU5: cpu@101 {
> > enable-method = "psci";
> > next-level-cache = <&L2_1>;
> > qcom,freq-domain = <&cpufreq_hw 1>;
> > + power-domains = <&CPU_PD5>;
> > + power-domain-names = "psci";
> > };
> >
> > CPU6: cpu@102 {
> > @@ -125,6 +137,8 @@ CPU6: cpu@102 {
> > enable-method = "psci";
> > next-level-cache = <&L2_1>;
> > qcom,freq-domain = <&cpufreq_hw 1>;
> > + power-domains = <&CPU_PD6>;
> > + power-domain-names = "psci";
> > };
> >
> > CPU7: cpu@103 {
> > @@ -137,6 +151,8 @@ CPU7: cpu@103 {
> > enable-method = "psci";
> > next-level-cache = <&L2_1>;
> > qcom,freq-domain = <&cpufreq_hw 1>;
> > + power-domains = <&CPU_PD7>;
> > + power-domain-names = "psci";
> > };
> >
> > cpu-map {
> > @@ -176,6 +192,68 @@ core3 {
> > };
> > };
> > };
> > +
> > + idle-states {
> > + entry-method = "psci";
> > +
> > + LITTLE_CPU_SLEEP_0: cpu-sleep-0-0 {
> > + compatible = "arm,idle-state";
> > + idle-state-name = "silver-rail-power-collapse";
> > + arm,psci-suspend-param = <0x40000003>;
> > + entry-latency-us = <290>;
> > + exit-latency-us = <376>;
> > + min-residency-us = <1182>;
> > + local-timer-stop;
> > + };
> > +
> > + BIG_CPU_SLEEP_0: cpu-sleep-1-0 {
> > + compatible = "arm,idle-state";
> > + idle-state-name = "gold-rail-power-collapse";
> > + arm,psci-suspend-param = <0x40000003>;
> > + entry-latency-us = <297>;
> > + exit-latency-us = <324>;
> > + min-residency-us = <1110>;
> > + local-timer-stop;
> > + };
> > + };
> > +
> > + domain-idle-states {
> > + CLUSTER_0_SLEEP_0: cluster-sleep-0-0 {
> > + /* GDHS */
> > + compatible = "domain-idle-state";
> > + arm,psci-suspend-param = <0x40000022>;
> This 0x22 ending seems very sus.
>
> The last nibble represents the core-level power state and the
> penultimate one represents the same at cluster level. A value
> of 2 in that cluster nibble is actually undefined by the PSCI spec,
> whereas the value of 4 (as you have in all of the other idle
> states, including D3G for the perf cluster) corresponds to
> "Retention", so unless there's a very weird nuance in the
> TZ for this SoC, it should probably end in 0x42.
>
> Otherwise I think this LGTM now!
I am also learning by experiment about the exact values to use here,
as the only ready reckoner of how these values are calculated, seems
to be available via [1].
Also it seems the downstream code uses the following approach to
calculate the LPM state suspend-param, which for example for
CLUSTER_0_SLEEP_1 states turns out to be:
state_id = get_cluster_id(cpu->parent, &affinity_level, from_idle); = 0x40
power_state = (is-reset << 30) = 0x40000000
affinity_level = (affinity level & 0x3) << 24 = 0x1000000
state_id += power_state + affinity_level + psci_id;
= 0x40000000 + 0x1000000 + 0x40 + 0x4 = 0x41000044
For the D3G cases as well, I just used the 'qcom,psci-mode = <2>'
value as provided in downstream code (see [2]), for the overall
calculations.
Also, the only usage of D3G state I could find upstream (in qcom dtsi
files0 is for 'msm8916' (see [3]), which also uses the value with
ending 0x2 -> 'arm,psci-suspend-param = <0x41000032>'
[1]. https://patchwork.kernel.org/project/linux-arm-msm/patch/20201221002907.2870059-3-danny@kdrag0n.dev/#23857409
[2]. https://android.googlesource.com/kernel/msm-extra/devicetree/+/refs/tags/android-11.0.0_r0.56/qcom/bengal-pm.dtsi#127
[3]. https://github.com/torvalds/linux/blob/master/arch/arm64/boot/dts/qcom/msm8916.dtsi#L209
Thanks,
Bhupesh
> > + entry-latency-us = <360>;
> > + exit-latency-us = <421>;
> > + min-residency-us = <782>;
> > + };
> > +
> > + CLUSTER_0_SLEEP_1: cluster-sleep-0-1 {
> > + /* Power Collapse */
> > + compatible = "domain-idle-state";
> > + arm,psci-suspend-param = <0x41000044>;
> > + entry-latency-us = <800>;
> > + exit-latency-us = <2118>;
> > + min-residency-us = <7376>;
> > + };
> > +
> > + CLUSTER_1_SLEEP_0: cluster-sleep-1-0 {
> > + /* GDHS */
> > + compatible = "domain-idle-state";
> > + arm,psci-suspend-param = <0x40000042>;
> > + entry-latency-us = <314>;
> > + exit-latency-us = <345>;
> > + min-residency-us = <660>;
> > + };
> > +
> > + CLUSTER_1_SLEEP_1: cluster-sleep-1-1 {
> > + /* Power Collapse */
> > + compatible = "domain-idle-state";
> > + arm,psci-suspend-param = <0x41000044>;
> > + entry-latency-us = <640>;
> > + exit-latency-us = <1654>;
> > + min-residency-us = <8094>;
> > + };
> > + };
> > };
> >
> > firmware {
> > @@ -199,6 +277,64 @@ pmu {
> > psci {
> > compatible = "arm,psci-1.0";
> > method = "smc";
> > +
> > + CPU_PD0: power-domain-cpu0 {
> > + #power-domain-cells = <0>;
> > + power-domains = <&CLUSTER_0_PD>;
> > + domain-idle-states = <&LITTLE_CPU_SLEEP_0>;
> > + };
> > +
> > + CPU_PD1: power-domain-cpu1 {
> > + #power-domain-cells = <0>;
> > + power-domains = <&CLUSTER_0_PD>;
> > + domain-idle-states = <&LITTLE_CPU_SLEEP_0>;
> > + };
> > +
> > + CPU_PD2: power-domain-cpu2 {
> > + #power-domain-cells = <0>;
> > + power-domains = <&CLUSTER_0_PD>;
> > + domain-idle-states = <&LITTLE_CPU_SLEEP_0>;
> > + };
> > +
> > + CPU_PD3: power-domain-cpu3 {
> > + #power-domain-cells = <0>;
> > + power-domains = <&CLUSTER_0_PD>;
> > + domain-idle-states = <&LITTLE_CPU_SLEEP_0>;
> > + };
> > +
> > + CPU_PD4: power-domain-cpu4 {
> > + #power-domain-cells = <0>;
> > + power-domains = <&CLUSTER_1_PD>;
> > + domain-idle-states = <&BIG_CPU_SLEEP_0>;
> > + };
> > +
> > + CPU_PD5: power-domain-cpu5 {
> > + #power-domain-cells = <0>;
> > + power-domains = <&CLUSTER_1_PD>;
> > + domain-idle-states = <&BIG_CPU_SLEEP_0>;
> > + };
> > +
> > + CPU_PD6: power-domain-cpu6 {
> > + #power-domain-cells = <0>;
> > + power-domains = <&CLUSTER_1_PD>;
> > + domain-idle-states = <&BIG_CPU_SLEEP_0>;
> > + };
> > +
> > + CPU_PD7: power-domain-cpu7 {
> > + #power-domain-cells = <0>;
> > + power-domains = <&CLUSTER_1_PD>;
> > + domain-idle-states = <&BIG_CPU_SLEEP_0>;
> > + };
> > +
> > + CLUSTER_0_PD: power-domain-cpu-cluster0 {
> > + #power-domain-cells = <0>;
> > + domain-idle-states = <&CLUSTER_0_SLEEP_0>, <&CLUSTER_0_SLEEP_1>;
> > + };
> > +
> > + CLUSTER_1_PD: power-domain-cpu-cluster1 {
> > + #power-domain-cells = <0>;
> > + domain-idle-states = <&CLUSTER_1_SLEEP_0>, <&CLUSTER_1_SLEEP_1>;
> > + };
> > };
> >
> > reserved_memory: reserved-memory {
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