ae74e11664
Protect script when ram_freq is not set
Safely load PSCI DTO to enable CPUidle driver: psci_idle
The PSCI DTO shall only be applied if TF-A & Crust
support CPU idle states [0]. Otherwise the CPU usage
will be at 100%. This will not be visible in top,
lead to overheating and battery drain.
Worst case scenario would lead to a fried chip if
the CPU thermal_zone does not work or is not enabled
in DTS.
[0] https://gitlab.com/postmarketOS/pmaports/-/issues/1901#note_1238456920
44 lines
877 B
Text
44 lines
877 B
Text
// Source: https://github.com/megous/linux/commit/9584b9c889dce3d58fcd465697d0a9857f764739
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/dts-v1/;
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/plugin/;
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&{/cpus} {
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cpu@0 {
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cpu-idle-states = <&cpu_sleep>, <&cluster_sleep>;
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};
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cpu@1 {
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cpu-idle-states = <&cpu_sleep>, <&cluster_sleep>;
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};
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cpu@2 {
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cpu-idle-states = <&cpu_sleep>, <&cluster_sleep>;
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};
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cpu@3 {
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cpu-idle-states = <&cpu_sleep>, <&cluster_sleep>;
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};
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idle-states {
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entry-method = "psci";
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cpu_sleep: cpu-sleep {
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compatible = "arm,idle-state";
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local-timer-stop;
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entry-latency-us = <800>;
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exit-latency-us = <1500>;
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min-residency-us = <25000>;
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arm,psci-suspend-param = <0x00010003>;
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};
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cluster_sleep: cluster-sleep {
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compatible = "arm,idle-state";
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local-timer-stop;
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entry-latency-us = <850>;
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exit-latency-us = <1500>;
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min-residency-us = <50000>;
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arm,psci-suspend-param = <0x01010013>;
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};
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};
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};
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