Linux/AM3352: USB Gadget driver problem

Hi Dwarakesh R

Thank you!

Is this patch for MUSB device mode.?

I use  SDK6,and the Kernel is 3.2.0

I can't find the "/drivers/usb/musb/musb_cppi41.c" file

The Kernel 3.2.0 has only cppi41.c cppi41_dma.c

I can success to send in 511byte, but 512byte can not be sent

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Gitweb:     http://git.kernel.org/linus/;a=commit;h=9267edaf8cd7b0ef2cd7785c677fe792c077b6ab
Commit:     9267edaf8cd7b0ef2cd7785c677fe792c077b6ab
Parent:     69e273c0b0a3c337a521d083374c918dc52c666f
Refname:    refs/heads/master
Author:     Bin Liu <b-liu@ti.com>
AuthorDate: Tue Aug 12 14:18:43 2014 -0500
Committer:  Felipe Balbi <balbi@ti.com>
CommitDate: Wed Sep 3 09:15:56 2014 -0500

    usb: musb: cppi41: fix not transmitting zero length packet issue
    
    CPPI TX does not transmit ZLP for TX transfers which
    - transfer size is multiple of EP packet size,
    - and URB_ZERO_PACKET is set in urb->transfer_flags.
    
    The fix is transmitting the ZLP using PIO mode after the CPPI TX is
    done.
    
    Validated using the following usbtest write case in MUSB host mode.
    
      # testusb -t1 -c1

Hi Justin,

As Biser suggested, it would be better to get the latest SDK. Since it would have fixes and patches already in place. I suggested above patch since it seems to be coming at the time of sending EP packet size(512). It is expected to send ZLP after sending it(Also if it fixes yoyr issue quickly, than getting and running latest code. But you might face other issues running older SDK). Can you try if you can patch it up to cpp41.c ?

Hi Dwarakesh R,

Thanks for your help!!

I found the following patch for SDK6 kernel 3.2.0

It still has same problem when i patched it