Linux Power mangament architechure

Discussion in 'Linux Hardware' started by bandaru_sivakrishna, Sep 17, 2012.

  1. bandaru_sivakrishna

    bandaru_sivakrishna New Member

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    Hai All,


    I am working on Linux power management on Cortex A-9 dual core micro-controller. I am new to power management. So Can you anybody Please Help me on Linux power management architecture with Hardware level.

    Please help me on this.....

    Thanks & Regards,
    Siva Krishna.
  2. bandaru_sivakrishna

    bandaru_sivakrishna New Member

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    Hi All,

    I am using Samsung-exynos micro-controller...in this controller we have 6 power states they are
    1) Normal
    2) Idle
    3) Deep-Idle
    4) Stop
    5) Deep-Stop
    6) Sleep

    But in linux Kenel we have only Four Power states, they are
    1) Run
    2) StandBy
    3) ShutDown
    4) Sleep

    So my question is How the Linux kernel 4 power states are controlled Samsung-exynos micro-controller 6 power states. How its inter-linked?

    Please Help me on this.

    Thanks & Regards
    Siva Krishna.
  3. Patrick Lumumba

    Patrick Lumumba New Member

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    am no expert but i'd suggest you try bridging certain states by assigning the same state twice to the Samsung microcontroller i.e normal to run, idle and deep idle to standby, shutdown to deep-stop and stop then sleep to sleep. alternatively skip the deep-idle and stop states then link the rest to the appropriate states

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