26 lines
1.0 KiB
Plaintext
26 lines
1.0 KiB
Plaintext
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In Rush Current Mitigation driver:
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On recent targets, APSS L2 memories are moved to APC domain which were
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earlier on Mx domain. Analysis suggests that on current targets APSS L2
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memories provide reverse capacitance on Mx and this used to provide buffer
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while powering ON Q6 L2. Now due to L2s moving to APC, the cushion is not
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available. So there is a chance of droop when Q6 L2 memories are being
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powered up.
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During Q6 low power modes L2 is kept in retention only and never collapsed. So
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the cases where it needs to be taken care is during PIL(modem and adsp bringup
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during boot). So in cold boot path before bringing up modem or adsp, turn on MM
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memories. Hence providing a intermediate load.
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Required properties:
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- compatible: Must be qcom,msm-inrush-current-mitigation
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- qcom,dependent-subsystems: List of subsystems which need the intermediate load
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- vdd-supply: gdsc handle to switch on memory.
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Example:
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qcom,inrush-current {
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compatible = "qcom,msm-inrush-current-mitigation";
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qcom,dependent-subsystems = "modem", "adsp";
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vdd-supply = <&gdsc_mdss>;
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};
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