Re: [PATCH] arm64: dts: qcom: x1e80100: add system power domain SS3 state

[Konrad Dybcio]

On 10/13/25 12:54 AM, Val Packett wrote:
> Add the same PSCI state as seen on other Oryon-based SoCs like SM8750
> and Glymur, seems to work fine on Hamoa as well.
> 
> Signed-off-by: Val Packett <val@xxxxxxxxxxxx>
> ---
> Tested on a Dell Latitude 7455:
> 
> /sys/kernel/debug/pm_genpd/power-domain-system/idle_states:
> State          Time Spent(ms) Usage      Rejected   Above      Below
> S0             69476          23006      195        21562      0
> 
> Seems to mostly be used in system suspend, though I've occasionally seen
> the counter increment a little bit during runtime as well.
> ---

FWIW the exact same state is hardcoded to be present if you use
PSCI_SYSTEM_SUSPEND (which is mapped to `deep` in /sys/power/mem_sleep)

>  arch/arm64/boot/dts/qcom/x1e80100.dtsi | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/x1e80100.dtsi b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
> index 3cf2568def3f..fab8104147bd 100644
> --- a/arch/arm64/boot/dts/qcom/x1e80100.dtsi
> +++ b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
> @@ -303,6 +303,14 @@ cluster_cl5: cluster-sleep-1 {
>  				exit-latency-us = <4000>;
>  				min-residency-us = <7000>;
>  			};
> +
> +			domain_ss3: domain-sleep-0 {
> +				compatible = "domain-idle-state";
> +				arm,psci-suspend-param = <0x0200c354>;
> +				entry-latency-us = <2800>;
> +				exit-latency-us = <4400>;
> +				min-residency-us = <10150>;

You seem to have copied these time numbers from 8750 as well, but
it's not a great idea, since they're tuned for getting a good perf/pwr
profile for a mobile phone

I attached an old patch I had laying around that described all three
states exposed in the windows DSDT (although I'm not sure if that's
exactly beneficial without additional tuning too)

+Mukesh please take a look

KonradFrom df74e0e5f669b136a08f758651771423b8be9c61 Mon Sep 17 00:00:00 2001
From: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
Date: Mon, 15 Jul 2024 16:16:41 +0200
Subject: [PATCH] arm64: dts: qcom: x1e80100: Add system sleep states

Add the missing system-wide sleep states based on the information
found in the DSDT.

DRIPS is a non-obvious name, but it's the state that the device enters
for Modern Standby on Windows (see [1], [2]).

The entry latency numbers (which were not provided anywhere) could use
some tuning, for starters I set them equal to exit latency, which is
not an entirely unreasonable estimate..

[1] https://learn.microsoft.com/en-us/windows-hardware/design/device-experiences/prepare-hardware-for-modern-standby
[2] https://dl.dell.com/manuals/all-products/esuprt_solutions_int/esuprt_solutions_int_solutions_resources/client-mobile-solution-resources_white-papers45_en-us.pdf
Signed-off-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
---
 arch/arm64/boot/dts/qcom/x1e80100.dtsi | 31 +++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/x1e80100.dtsi b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
index e80a454fb8df..a35ab4f7cdc9 100644
--- a/arch/arm64/boot/dts/qcom/x1e80100.dtsi
+++ b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
@@ -302,6 +302,33 @@ CLUSTER_CL5: cluster-sleep-1 {
 				exit-latency-us = <2500>;
 				min-residency-us = <7000>;
 			};
+
+			SYSTEM_SLEEP0: system-sleep-0 {
+				compatible = "domain-idle-state";
+				idle-state-name = "system-sleep0";
+				arm,psci-suspend-param = <0x02000154>;
+				entry-latency-us = <500>;
+				exit-latency-us = <500>;
+				min-residency-us = <7500>;
+			};
+
+			SYSTEM_SLEEP1: system-sleep-1 {
+				compatible = "domain-idle-state";
+				idle-state-name = "system-sleep1";
+				arm,psci-suspend-param = <0x02000254>;
+				entry-latency-us = <3000>;
+				exit-latency-us = <3000>;
+				min-residency-us = <8000>;
+			};
+
+			SYSTEM_DRIPS: system-sleep-2 {
+				compatible = "domain-idle-state";
+				idle-state-name = "drips";
+				arm,psci-suspend-param = <0x0200c354>;
+				entry-latency-us = <5000>;
+				exit-latency-us = <5000>;
+				min-residency-us = <9000>;
+			};
 		};
 	};
 
@@ -435,7 +462,9 @@ CLUSTER_PD2: power-domain-cpu-cluster2 {
 
 		SYSTEM_PD: power-domain-system {
 			#power-domain-cells = <0>;
-			/* TODO: system-wide idle states */
+			domain-idle-states = <&SYSTEM_SLEEP0>,
+					     <&SYSTEM_SLEEP1>,
+					     <&SYSTEM_DRIPS>;
 		};
 	};
 
-- 
2.51.0