APQ8096 has its VDD APC (Power for quad Kryo applications
microprocessors) powered by PM8996 PMIC S9, S10, S11 tri-phase
regulators (gang). The bootloader may have configured these
regulators with non sustainable default values, leading to sporadic
hangs under CPU stress tests (cpufreq-bench). Ideally we should enable
voltage scaling along with frequency scaling, but for now just set the
regulator gang value to a sane voltage, capable of supporting highest
frequencies (turbo).
Signed-off-by: Loic Poulain <loic.poulain@xxxxxxxxxx>
---
v2: Move pm8994_spmi_regulators node to pm8994 dtsi
Move syscon to msm8996 dtsi
lower case for addresses
arch/arm64/boot/dts/qcom/apq8096-db820c.dtsi | 16 ++++++++++++++++
arch/arm64/boot/dts/qcom/msm8996.dtsi | 5 +++++
arch/arm64/boot/dts/qcom/pm8994.dtsi | 4 ++++
3 files changed, 25 insertions(+)
diff --git a/arch/arm64/boot/dts/qcom/apq8096-db820c.dtsi b/arch/arm64/boot/dts/qcom/apq8096-db820c.dtsi
index dba3488..89c7b19 100644
--- a/arch/arm64/boot/dts/qcom/apq8096-db820c.dtsi
+++ b/arch/arm64/boot/dts/qcom/apq8096-db820c.dtsi
@@ -669,6 +669,22 @@
};
};
+&pm8994_spmi_regulators {
+ qcom,saw-reg = <&saw3>;
+ s9 {
+ qcom,saw-slave;
+ };
+ s10 {
+ qcom,saw-slave;
+ };
+ s11 {
+ qcom,saw-leader;
+ regulator-always-on;
+ regulator-min-microvolt = <1230000>;
+ regulator-max-microvolt = <1230000>;
+ };
+};
+
&spmi_bus {
pmic@0 {
pon@800 {
diff --git a/arch/arm64/boot/dts/qcom/msm8996.dtsi b/arch/arm64/boot/dts/qcom/msm8996.dtsi
index 4ca2e7b..715f26e 100644
--- a/arch/arm64/boot/dts/qcom/msm8996.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8996.dtsi
@@ -611,6 +611,11 @@
reg = <0x7a0000 0x18000>;
};
+ saw3: syscon@9a10000 {
+ compatible = "syscon";
+ reg = <0x09a10000 0x1000>;
+ };
+
intc: interrupt-controller@9bc0000 {
compatible = "qcom,msm8996-gic-v3", "arm,gic-v3";
#interrupt-cells = <3>;
diff --git a/arch/arm64/boot/dts/qcom/pm8994.dtsi b/arch/arm64/boot/dts/qcom/pm8994.dtsi
index 76b5a3e..7e4f777 100644
--- a/arch/arm64/boot/dts/qcom/pm8994.dtsi
+++ b/arch/arm64/boot/dts/qcom/pm8994.dtsi
@@ -85,5 +85,9 @@
reg = <0x1 SPMI_USID>;
#address-cells = <1>;
#size-cells = <0>;
+
+ pm8994_spmi_regulators: regulators {
+ compatible = "qcom,pm8994-regulators";
+ };
};
};
--
2.7.4
