IMX8MQ android休眠功耗过大

[晓锋潘]

操作系统：android 9.0.0_1.0.0

处理器：IMX8MQ

问题：android深度休眠后CPU小系统功耗太大，功耗为3.3V*260mA，这个还有办法再降吗？在这个版本上系统休眠后能否关掉更多的clk？系统休眠后CPU的四个核都是UP状态，能关掉几个核吗？要怎么操作？我的目标是在系统休眠时功耗降到3.3V*100mA以下。

[晓锋潘]

系统休眠的log如下：

[   49.693516] mma enable setting standby
[   50.798836] PM: suspend entry (deep)
[   50.802686] PM: Syncing filesystems ... done.
[   50.817807] Freezing user space processes ... (elapsed 0.002 seconds) done.
[   50.827335] OOM killer disabled.
[   50.830579] Freezing remaining freezable tasks ... (elapsed 0.063 seconds) done.
[   50.901360] Suspending console(s) (use no_console_suspend to debug)
[   50.915455] android_work: did not send uevent (0 0           (null))
[   51.625036] PM: Wakeup pending, aborting suspend
[   51.625054] PM: Some devices failed to suspend, or early wake event detected
[   51.751446] PM: resume devices took 0.128 seconds
[   51.774240] OOM killer enabled.
[   51.777382] Restarting tasks ... done.
[   51.785352] hantro receive hot notification event: 0
[   51.805683] PM: suspend exit
[   52.008915] PM: suspend entry (deep)
[   52.012522] PM: Syncing filesystems ... done.
[   52.175809] Freezing user space processes ... (elapsed 0.002 seconds) done.
[   52.185014] OOM killer disabled.
[   52.188273] Freezing remaining freezable tasks ... (elapsed 0.016 seconds) done.
[   52.212777] Suspending console(s) (use no_console_suspend to debug)
[   52.225701] android_work: did not send uevent (0 0           (null))
[   52.938761] PM: suspend devices took 0.720 seconds
[   52.942213] Disabling non-boot CPUs ...
[   52.961548] CPU0: update max cpu_capacity 1024
[   52.965556] CPU1: shutdown
[   52.965560] psci: CPU1 killed.
[   52.985548] CPU0: update max cpu_capacity 1024
[   52.989544] CPU2: shutdown
[   52.989547] psci: CPU2 killed.
[   53.005986] IRQ 6: no longer affine to CPU3
[   53.013542] CPU3: shutdown
[   53.013546] psci: CPU3 killed.
[   53.013912] Enabling non-boot CPUs ...
[   53.014568] Detected VIPT I-cache on CPU1
[   53.014594] GICv3: CPU1: found redistributor 1 region 0:0x00000000388a0000
[   53.014645] CPU1: Booted secondary processor [410fd034]
[   53.015116]  cache: parent cpu1 should not be sleeping
[   53.015392] CPU1 is up
[   53.016087] Detected VIPT I-cache on CPU2
[   53.016104] GICv3: CPU2: found redistributor 2 region 0:0x00000000388c0000
[   53.016140] CPU2: Booted secondary processor [410fd034]
[   53.016493]  cache: parent cpu2 should not be sleeping
[   53.016746] CPU2 is up
[   53.017368] Detected VIPT I-cache on CPU3
[   53.017388] GICv3: CPU3: found redistributor 3 region 0:0x00000000388e0000
[   53.017424] CPU3: Booted secondary processor [410fd034]
[   53.017703] CPU0: update max cpu_capacity 1024
[   53.017821]  cache: parent cpu3 should not be sleeping
[   53.018110] CPU3 is up
[   53.021501] CPU1: update max cpu_capacity 1024
[   53.151583] PM: resume devices took 0.128 seconds
[   53.287895] OOM killer enabled.
[   53.291103] Restarting tasks ... done.
[   53.301285] hantro receive hot notification event: 0
[   53.350175] PM: suspend exit
[   53.566635] PM: suspend entry (deep)
[   53.570287] PM: Syncing filesystems ... done.
[   53.761257] Freezing user space processes ... (elapsed 0.002 seconds) done.
[   53.770619] OOM killer disabled.
[   53.773926] Freezing remaining freezable tasks ... (elapsed 0.028 seconds) done.
[   53.809799] Suspending console(s) (use no_console_suspend to debug)
[   53.823884] android_work: did not send uevent (0 0           (null))
[   54.534774] PM: suspend devices took 0.720 seconds
[   54.537551] Disabling non-boot CPUs ...
[   54.554195] IRQ 6: no longer affine to CPU1
[   54.557508] CPU0: update max cpu_capacity 1024
[   54.561504] CPU1: shutdown
[   54.561508] psci: CPU1 killed.
[   54.581507] CPU0: update max cpu_capacity 1024
[   54.585503] CPU2: shutdown
[   54.585506] psci: CPU2 killed.
[   54.609502] CPU3: shutdown
[   54.609505] psci: CPU3 killed.
[   54.609805] Enabling non-boot CPUs ...
[   54.610439] Detected VIPT I-cache on CPU1
[   54.610464] GICv3: CPU1: found redistributor 1 region 0:0x00000000388a0000
[   54.610515] CPU1: Booted secondary processor [410fd034]
[   54.610987]  cache: parent cpu1 should not be sleeping
[   54.611263] CPU1 is up
[   54.612018] Detected VIPT I-cache on CPU2
[   54.612036] GICv3: CPU2: found redistributor 2 region 0:0x00000000388c0000
[   54.612071] CPU2: Booted secondary processor [410fd034]
[   54.612422]  cache: parent cpu2 should not be sleeping
[   54.612676] CPU2 is up
[   54.613391] Detected VIPT I-cache on CPU3
[   54.613411] GICv3: CPU3: found redistributor 3 region 0:0x00000000388e0000
[   54.613447] CPU3: Booted secondary processor [410fd034]
[   54.613472] CPU2: update max cpu_capacity 1024
[   54.613852]  cache: parent cpu3 should not be sleeping
[   54.614125] CPU3 is up
[   54.617458] CPU2: update max cpu_capacity 1024
[   54.746145] PM: resume devices took 0.128 seconds
[   54.880073] OOM killer enabled.
[   54.883223] Restarting tasks ... done.
[   54.889032] hantro receive hot notification event: 0
[   54.948747] PM: suspend exit
[   55.163594] PM: suspend entry (deep)
[   55.168534] PM: Syncing filesystems ... done.
[   55.290189] Freezing user space processes ... (elapsed 0.002 seconds) done.
[   55.299911] OOM killer disabled.
[   55.303221] Freezing remaining freezable tasks ... (elapsed 0.008 seconds) done.
[   55.319256] Suspending console(s) (use no_console_suspend to debug)
[   55.333632] android_work: did not send uevent (0 0           (null))
[   55.338372] dpm_run_callback(): platform_pm_suspend+0x0/0x50 returns -16
[   55.338376] PM: Device alarmtimer failed to suspend: error -16
[   55.455550] PM: Some devices failed to suspend, or early wake event detected
[   55.515432] PM: resume devices took 0.060 seconds
[   55.546336] OOM killer enabled.
[   55.549552] Restarting tasks ... done.
[   55.555233] hantro receive hot notification event: 0
[   55.637116] PM: suspend exit
[   57.350096] PM: suspend entry (deep)
[   57.353758] PM: Syncing filesystems ... done.
[   57.495695] Freezing user space processes ... (elapsed 0.002 seconds) done.
[   57.504779] OOM killer disabled.
[   57.508020] Freezing remaining freezable tasks ... (elapsed 0.060 seconds) done.
[   57.575528] Suspending console(s) (use no_console_suspend to debug)

[jimmychan]

Please refer to AN https://www.nxp.com/docs/en/nxp/application-notes/AN12118.pdf