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arm64: dts: apq8096-db820c: Fix VDD core voltage

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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@linaro.org>
Link: https://lore.kernel.org/r/1578401755-26211-1-git-send-email-loic.poulain@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Loic Poulain 2020-01-07 13:55:55 +01:00 committed by Bjorn Andersson
parent eac8ce86cb
commit 7a2a2231ef
3 changed files with 25 additions and 0 deletions
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16
arch/arm64/boot/dts/qcom/apq8096-db820c.dtsi
View File

@ -647,6 +647,22 @@
"NC";
};
&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>;
};
};
&pmi8994_gpios {
gpio-line-names =
"NC",

5
arch/arm64/boot/dts/qcom/msm8996.dtsi
View File

@ -2137,6 +2137,11 @@
};
};
saw3: syscon@9a10000 {
compatible = "syscon";
reg = <0x09a10000 0x1000>;
};
intc: interrupt-controller@9bc0000 {
compatible = "qcom,msm8996-gic-v3", "arm,gic-v3";
#interrupt-cells = <3>;

4
arch/arm64/boot/dts/qcom/pm8994.dtsi
View File

@ -85,5 +85,9 @@
reg = <0x1 SPMI_USID>;
#address-cells = <1>;
#size-cells = <0>;
pm8994_spmi_regulators: regulators {
compatible = "qcom,pm8994-regulators";
};
};
};