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ti-sdk-beagleboard-06.00.00 OTG Issue

dibin moolakadan1
Expert 1180 points

Hi All,

 I am trying to work on beagle board OTG  with  sdk 06.00.00.

 The device is working  either as a HOST or a DEVICE 

The issue is once hdrc mode  is changed  to a_idle state it never returns to b_idle or b_ peripheral state and                                                                    

i   need a reboot to make it return to b_idle .

cat  /sys/devices/platform/omap/musb-omap2430/musb-hdrc/mode    is b_idle at boot up. And when i

 connect  OTG cable the mode changes to a_idle  and never returns to b_idle   on disconnecting the OTG cable .  I

have connected the board to PC by a MIniB usb  Cable but the mode remails at a_idle.  Is there any kernel patch

available for this issue? Any one point me how to solve this issue.  

 

Regards,

Dibin

 

  • 0
    TI__Guru 65405 points

    Hi Dibin,

    Could you give more detailed description in steps what do you do and what state of the mode you observe in each one step?

    BR

    Tsvetolin Shulev

  • 0 in reply to Cvetolin Shulev-XID
    Expert 1180 points

    Hi Shulev,

    Thankyou very much for your quick response. Below are the steps i followed.

    1. Booted Up the board

    cat  /sys/devices/platform/omap/musb-omap2430/musb-hdrc/mode    shows   b_idle

    2. Connected OTG cable to the board

    cat  /sys/devices/platform/omap/musb-omap2430/musb-hdrc/mode   shows     a_idle

    3. Disconnected OTG cable from the board 

    cat  /sys/devices/platform/omap/musb-omap2430/musb-hdrc/mode  shows      a_idle

    4.Connected MiniUSB cable to the Board and Connected it to Computer

    cat  /sys/devices/platform/omap/musb-omap2430/musb-hdrc/mode    shows     a_idle

    In the 4 th case board  should change mode from a_idle to b_idle or to b_peripheral , and the board should detect in my computer as a ethernet gadget .

    Which is not happening in my case!!!!!!!.

    Once the mode is changed to a_idle its  remains at that mode .

    Regards,

    Dibin

  • 0 in reply to dibin moolakadan1
    Expert 1180 points

    Hi Shulev ,

    I found a similar issue reported for am35xx and for older kernel.

    http://e2e.ti.com/support/arm/sitara_arm/f/791/t/189348.aspx

    Bin Liu has  posted a patch for this issue , Which is no longer  available. 

    As per him we  have to keep the timer (otg_workaround) running to set OTG back to b_idle state once the ID pin is no longer grounded.

    Can you please tell your thoughts on , how to do this.

    Regards,

    Dibin

  • 0 in reply to dibin moolakadan1
    TI__Guru 65405 points

    Hi Dibin,

    As I'm reading the 4-th case of detailed description of the issue I could say that the behaviour is incorrect and it is a bug. I check the linked page:

    http://arago-project.org/git/projects/?p=linux-omap3.git;a=commit;h=20c003f2f024d9f50f59edf9f1b8f5f035fb15b8

    and I suggest you if you could find a patch or it could not be applied to your sources to prepare your own patch as made diff between the files:

    drivers/usb/musb/musb_core.c
    drivers/usb/musb/musb_core.h
    drivers/usb/musb/musb_gadget.c
    drivers/usb/musb/omap2430.c

    from the link and those in your source or apply the differences manually.

    BR

    Tsvetolin Shulev