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OMAP3530 framebuffer LCD suspend and resume

Eswar
Intellectual 420 points
Other Parts Discussed in Thread: OMAP3530, WL1271

Hi,

   On our omap3530 based board we are trying to suspend/resume the board. We used the following commands

         echo mem > /sys/power/state

But we are getting blank screen after we resume. We also applied patch from the below link still not working.

http://lists.linaro.org/pipermail/linaro-dev/2011-June/005046.html

Anyone having solution for suspend and resume issue on frame buffer.


Thanks Regards

Eswar

  • 0
    TI__Guru 65405 points

    Hi Eswar,

    I checked the issue on my board omap3evm equipped with omap3530 and DVSDK 4.03 Linux kernel 2.6.37 and suspend / resume procedure works properly. The test is performed without the patch and observing LCD display. The resume is achieved after both cases - serial console activity and touchscreen activity. There is the console output:

    root@omap35x-evm:/sys/power# echo mem > state
    [ 1060.185821] PM: Syncing filesystems ... done.
    [ 1060.191375] PM: Preparing system for mem sleep
    [ 1060.196075] Freezing user space processes ... (elapsed 0.01 seconds) done.
    [ 1060.219665] Freezing remaining freezable tasks ... (elapsed 0.02 seconds) done.
    [ 1060.250976] PM: Entering mem sleep
    [ 1060.254852] Suspending console(s) (use no_console_suspend to debug)
    [ 1060.266204] wl1271: wl1271_suspend: wow_enabled: 0
    [ 1060.497039] PM: suspend of devices complete after 234.344 msecs
    [ 1060.497955] PM: late suspend of devices complete after 0.915 msecs
    [ 1063.716308] Successfully put all powerdomains to target state
    [ 1063.717010] PM: early resume of devices complete after 0.549 msecs
    [ 1063.717407] platform iva.0: omap_voltage_scale: Already at the requestedrate 800000000
    [ 1063.717407] platform mpu.0: omap_voltage_scale: Already at the requestedrate 1000000000
    [ 1064.185729] wl1271: wl1271 resume
    [ 1064.188354] PM: resume of devices complete after 471.252 msecs
    [ 1064.246398] PM: Finishing wakeup.
    [ 1064.249908] Restarting tasks ... done.
    root@omap35x-evm:/sys/power#

    About the patch - read the next messages of discussion in the patch page. It seems that it is not working properly with the HDMI/DVI interface.

    BR

    Tsvetolin Shulev

  • 0 in reply to Cvetolin Shulev-XID
    Intellectual 420 points

    Hi,

       Thanks for reply. But when we tried with 2.6.37 kernel on our board we are getting the following messages on the console. And LCD is displaying Black screen after resume.

      [  197.898773] PM: Syncing filesystems ... done.
    [  197.931091] Freezing user space processes ... (elapsed 0.02 seconds) done.
    [  197.961120] Freezing remaining freezable tasks ... (elapsed 0.03 seconds) done.
    [  198.008514] Suspending console(s) (use no_console_suspend to debug)
    [  198.116607] PM: suspend of devices complete after 94.421 msecs
    [  198.122497] omap_device: omap_i2c.1: new worst case deactivate latency 0: 183105
    [  198.122894] PM: late suspend of devices complete after 6.286 msecs
    [  198.123626] omap_device: omap_uart.2: new worst case deactivate latency 0: 30517
    [  199.733856] omap_device: omap_uart.0: new worst case activate latency 0: 91552
    [  199.734008] Powerdomain (core_pwrdm) didn't enter target state 1
    [  199.734039] Powerdomain (cam_pwrdm) didn't enter target state 1
    [  199.734039] Powerdomain (per_pwrdm) didn't enter target state 1
    [  199.734069] Could not enter target state in pm_suspend
    [  199.737121] PM: early resume of devices complete after 2.807 msecs

    [  199.900299] PM: resume of devices complete after 161.895 msecs
    [  199.985321] Restarting tasks ...
    [  199.990386] done.

    Is this warnings are problem for LCD Black screen after resume??

    Thanks Regards

    Eswar