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Linux/AM5728: Quick suspend and wake

solid repellent
Intellectual 850 points
Part Number: AM5728
Other Parts Discussed in Thread: TMDSEVM572X

Tool/software: Linux

Hi TI,

I am using TI AM572x EVM board without the touchscreen attachment.

I would like to quickly suspend the CPU from the command line and wake it again (from the command line). I am accessing the command line from the serial interface. I am guessing that "standby" could be used like below.

$ echo standby > /sys/power/state

But, I am not sure how to wake it back? from the command line? Could you please throw some light on this?

I am using 4.4.32 kernel.

root@am57xx-evm:~/temperature# uname -a
Linux am57xx-evm 4.4.32-gadde2ca9f8 #1 SMP PREEMPT Wed Dec 14 19:14:12 EST 2016 armv7l GNU/Linux

Thank you for your time.

  • 0
    TI__Guru**** 170625 points
    Hi Solid,

    Do you use 4.4.32 kernel that is coming with AM57x PSDK Linux v3.02?

    You can resume AM57x device from UART console. Refer to the below wiki for details:

    processors.wiki.ti.com/.../Linux_Core_Power_Management_User's_Guide_(v4.4)

    Regards,
    Pavel
  • 0 in reply to Pavel Botev
    Intellectual 850 points
    Thank you Pavel. I am using the 4.4.32 kernel from Linux SDK.

    I enabled the UART capability by the following command.

    echo enabled > /sys/devices/platform/44000000.ocp/48020000.serial/tty/ttyS2/power/wakeup

    Then entered the deep sleep state 0 (standby mode is not supported) with the following command.

    echo mem > /sys/power/state

    It works for the first time. I mean, I was able to enter the deepsleep state and come out of it. But when I go to the deepsleep state again and try to wake up, it does not wake up and requires me to push the reset button.

    I checked the /sys/devices/platform/44000000.ocp/48020000.serial/tty/ttyS2/power/wakeup file before going into the deepsleep state for the second time. It is still enabled.

    Any ideas, why it behaves like this?

    Thank you once again.
  • 0 in reply to solid repellent
    TI__Guru**** 170625 points
    Solid,

    I have tried on my side, I have TMDSEVM572X rev A.20, I am using PSDK Linux 5.01 (kernel 4.14.67, pre-built binaries).

    I see that quick suspend/resume (try 3 times) is working fine, see below log:

    root@am57xx-evm:~# echo enabled > /sys/devices/platform/44000000.ocp/48020000.serial/tty/ttyS2/power/wakeup
    root@am57xx-evm:~# echo mem > /sys/power/state
    [ 69.261059] PM: suspend entry (deep)
    [ 69.264655] PM: Syncing filesystems ... done.
    [ 70.777857] Freezing user space processes ... (elapsed 0.001 seconds) done.
    [ 70.786205] OOM killer disabled.
    [ 70.789442] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
    [ 70.798121] Suspending console(s) (use no_console_suspend to debug)
    [ 71.053633] Disabling non-boot CPUs ...
    [ 71.102678] Successfully put all powerdomains to target state
    [ 71.102720] Enabling non-boot CPUs ...
    [ 71.102787] CPU1: smp_ops.cpu_die() returned, trying to resuscitate
    [ 71.103134] CPU1 is up
    [ 71.119723] omap-iommu 58882000.mmu: 58882000.mmu: version 2.1
    [ 71.124104] net eth0: initializing cpsw version 1.15 (0)
    [ 71.241396] Micrel KSZ9031 Gigabit PHY 48485000.mdio:01: attached PHY driver [Micrel KSZ9031 Gigabit PHY] (mii_bus:phy_addr=48485000.mdio:01, irq=POLL)
    [ 71.243244] cpts ptp bc clkid 0
    [ 71.243271] net eth1: initializing cpsw version 1.15 (0)
    [ 71.361593] Micrel KSZ9031 Gigabit PHY 48485000.mdio:02: attached PHY driver [Micrel KSZ9031 Gigabit PHY] (mii_bus:phy_addr=48485000.mdio:02, irq=POLL)
    [ 71.452382] ata1: SATA link down (SStatus 0 SControl 300)
    [ 71.769608] usb 1-1: reset high-speed USB device number 2 using xhci-hcd
    [ 72.194859] OOM killer enabled.
    [ 72.198009] Restarting tasks ... done.
    [ 72.208188] PM: suspend exit
    root@am57xx-evm:~# echo mem > /sys/power/state
    [ 75.031237] PM: suspend entry (deep)
    [ 75.034833] PM: Syncing filesystems ... done.
    [ 76.033928] Freezing user space processes ... (elapsed 0.001 seconds) done.
    [ 76.042443] OOM killer disabled.
    [ 76.045682] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
    [ 76.054348] Suspending console(s) (use no_console_suspend to debug)
    [ 76.322890] Disabling non-boot CPUs ...
    [ 76.371938] Successfully put all powerdomains to target state
    [ 76.371978] Enabling non-boot CPUs ...
    [ 76.372044] CPU1: smp_ops.cpu_die() returned, trying to resuscitate
    [ 76.372405] CPU1 is up
    [ 76.388679] omap-iommu 58882000.mmu: 58882000.mmu: version 2.1
    [ 76.393060] net eth0: initializing cpsw version 1.15 (0)
    [ 76.511416] Micrel KSZ9031 Gigabit PHY 48485000.mdio:01: attached PHY driver [Micrel KSZ9031 Gigabit PHY] (mii_bus:phy_addr=48485000.mdio:01, irq=POLL)
    [ 76.513445] cpts ptp bc clkid 0
    [ 76.513471] net eth1: initializing cpsw version 1.15 (0)
    [ 76.631569] Micrel KSZ9031 Gigabit PHY 48485000.mdio:02: attached PHY driver [Micrel KSZ9031 Gigabit PHY] (mii_bus:phy_addr=48485000.mdio:02, irq=POLL)
    [ 76.722373] ata1: SATA link down (SStatus 0 SControl 300)
    [ 77.039571] usb 1-1: reset high-speed USB device number 2 using xhci-hcd
    [ 77.464777] OOM killer enabled.
    [ 77.467927] Restarting tasks ... done.
    [ 77.485947] PM: suspend exit
    root@am57xx-evm:~# echo mem > /sys/power/state
    [ 89.961036] PM: suspend entry (deep)
    [ 89.964633] PM: Syncing filesystems ... done.
    [ 90.977146] Freezing user space processes ... (elapsed 0.001 seconds) done.
    [ 90.985528] OOM killer disabled.
    [ 90.988766] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
    [ 90.997391] Suspending console(s) (use no_console_suspend to debug)
    [ 91.252838] Disabling non-boot CPUs ...
    [ 91.302035] Successfully put all powerdomains to target state
    [ 91.302097] Enabling non-boot CPUs ...
    [ 91.302162] CPU1: smp_ops.cpu_die() returned, trying to resuscitate
    [ 91.302530] CPU1 is up
    [ 91.319268] omap-iommu 58882000.mmu: 58882000.mmu: version 2.1
    [ 91.323764] net eth0: initializing cpsw version 1.15 (0)
    [ 91.441595] Micrel KSZ9031 Gigabit PHY 48485000.mdio:01: attached PHY driver [Micrel KSZ9031 Gigabit PHY] (mii_bus:phy_addr=48485000.mdio:01, irq=POLL)
    [ 91.443592] cpts ptp bc clkid 0
    [ 91.443619] net eth1: initializing cpsw version 1.15 (0)
    [ 91.561768] Micrel KSZ9031 Gigabit PHY 48485000.mdio:02: attached PHY driver [Micrel KSZ9031 Gigabit PHY] (mii_bus:phy_addr=48485000.mdio:02, irq=POLL)
    [ 91.652372] ata1: SATA link down (SStatus 0 SControl 300)
    [ 91.969772] usb 1-1: reset high-speed USB device number 2 using xhci-hcd
    [ 92.394418] OOM killer enabled.
    [ 92.397568] Restarting tasks ... done.
    [ 92.414991] PM: suspend exit

    I am using UART console for wakeup.

    I will suggest you to try your EVM with PSDK 5.02 or PSDK 5.01 versions.

    Regards,
    Pavel
  • 0 in reply to Pavel Botev
    TI__Guru**** 170625 points
    If you have no more questions related to the subject of this e2e thread, please close/verify/resolve this thread.

    Regards,
    Pavel
  • 0 in reply to Pavel Botev
    Expert 1370 points

    Hi Pavel,

    I have similar problem on TDA2X EVM board (VSDK v3.5).

    I have tried the commands , the logs message:

    ===================================

    Arago Project http://arago-project.org dra7xx-evm ttyS0

    Arago 2016.12 dra7xx-evm ttyS0

    dra7xx-evm login: root
    root@dra7xx-evm:~# [   43.057636] random: nonblocking pool is initialized

    root@dra7xx-evm:~# echo enabled > /sys/devices/platform/44000000.ocp/48020000.serial/tty/ttyS2/power/wakeup
    root@dra7xx-evm:~# echo mem > /sys/power/state
    [   80.097578] PM: Syncing filesystems ... done.
    [   80.128512] Freezing user space processes ... (elapsed 0.001 seconds) done.
    [   80.136942] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
    [   80.145711] Suspending console(s) (use no_console_suspend to debug)

    ========================================================

    I need reset the power then restart system.

    Could you teach me how to fix the issue of wakeup? Thanks.

    BR,

    Sam Hsieh

  • 0 in reply to sam hsieh
    TI__Guru**** 170625 points
    Hi Sam Hsieh,

    Sorry, I am not able to help with TDA2X EVM board (VSDK v3.5). You need to open new e2e thread for your issue.

    Regards,
    Pavel