linux-kernel - [PATCH 3/7] arm64: dts: qcom: sm8550: Fix up CPU idle states

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Message-Id: <20230830-topic-8550_dmac2-v1-3-49bb25239fb1@linaro.org>
Date:   Wed, 30 Aug 2023 14:48:42 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Abel Vesa <abel.vesa@...aro.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Sai Prakash Ranjan <quic_saipraka@...cinc.com>,
        Vinod Koul <vkoul@...nel.org>
Cc:     Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH 3/7] arm64: dts: qcom: sm8550: Fix up CPU idle states

The idle residency times are largely too low according to the vendor
kernel (maybe they came from an earlier release or something), especially
for the prime X2 core. Fix them.

Fixes: ffc50b2d3828 ("arm64: dts: qcom: Add base SM8550 dtsi")
Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 arch/arm64/boot/dts/qcom/sm8550.dtsi | 32 +++++++++++++++++++++-----------
 1 file changed, 21 insertions(+), 11 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sm8550.dtsi b/arch/arm64/boot/dts/qcom/sm8550.dtsi
index d115960bdeec..c21ba6afa752 100644
--- a/arch/arm64/boot/dts/qcom/sm8550.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm8550.dtsi
@@ -283,9 +283,9 @@ LITTLE_CPU_SLEEP_0: cpu-sleep-0-0 {
 				compatible = "arm,idle-state";
 				idle-state-name = "silver-rail-power-collapse";
 				arm,psci-suspend-param = <0x40000004>;
-				entry-latency-us = <800>;
+				entry-latency-us = <550>;
 				exit-latency-us = <750>;
-				min-residency-us = <4090>;
+				min-residency-us = <6700>;
 				local-timer-stop;
 			};
 
@@ -294,8 +294,18 @@ BIG_CPU_SLEEP_0: cpu-sleep-1-0 {
 				idle-state-name = "gold-rail-power-collapse";
 				arm,psci-suspend-param = <0x40000004>;
 				entry-latency-us = <600>;
-				exit-latency-us = <1550>;
-				min-residency-us = <4791>;
+				exit-latency-us = <1300>;
+				min-residency-us = <8136>;
+				local-timer-stop;
+			};
+
+			PRIME_CPU_SLEEP_0: cpu-sleep-2-0 {
+				compatible = "arm,idle-state";
+				idle-state-name = "gold-plus-rail-power-collapse";
+				arm,psci-suspend-param = <0x40000004>;
+				entry-latency-us = <500>;
+				exit-latency-us = <1350>;
+				min-residency-us = <7480>;
 				local-timer-stop;
 			};
 		};
@@ -304,17 +314,17 @@ domain-idle-states {
 			CLUSTER_SLEEP_0: cluster-sleep-0 {
 				compatible = "domain-idle-state";
 				arm,psci-suspend-param = <0x41000044>;
-				entry-latency-us = <1050>;
-				exit-latency-us = <2500>;
-				min-residency-us = <5309>;
+				entry-latency-us = <750>;
+				exit-latency-us = <2350>;
+				min-residency-us = <9144>;
 			};
 
 			CLUSTER_SLEEP_1: cluster-sleep-1 {
 				compatible = "domain-idle-state";
 				arm,psci-suspend-param = <0x4100c344>;
-				entry-latency-us = <2700>;
-				exit-latency-us = <3500>;
-				min-residency-us = <13959>;
+				entry-latency-us = <2800>;
+				exit-latency-us = <4400>;
+				min-residency-us = <10150>;
 			};
 		};
 	};
@@ -398,7 +408,7 @@ CPU_PD6: power-domain-cpu6 {
 		CPU_PD7: power-domain-cpu7 {
 			#power-domain-cells = <0>;
 			power-domains = <&CLUSTER_PD>;
-			domain-idle-states = <&BIG_CPU_SLEEP_0>;
+			domain-idle-states = <&PRIME_CPU_SLEEP_0>;
 		};
 
 		CLUSTER_PD: power-domain-cluster {

-- 
2.42.0