Hello,
I posted this on the Keystone forum yesterday. Maybe this is a more appropriate forum for this issue, so posting it here (I will remove it from the other forum.)
I am trying to use a USB camera on the TCI6638K2K evaluation board.
I have built the Keystone kernel with v4l support and I am testing it using yavta: http://git.ideasonboard.org/yavta.git
It works OK if I use very low resolution raw format. But when I capture raw data at VGA resolution, the following kernel error occurs:
xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
I suspect that it might be a bandwidth issue since it doesn't occur so easily when using compressed format (MJPEG) or when using small enough resolutions in raw format:
E.g.
root@keystone-evm:~#./yavta -f UYVY -s 640x480 --capture=1 --file=raw-640x480-#.bin /dev/video1
Device /dev/video1 opened.
Device `UVC Camera (046d:081b)' on `usb-xhci-hcd-1' is a video capture device.
Video format set: YUYV (56595559) 640x480 (stride 1280) buffer size 614400
Video format: YUYV (56595559) 640x480 (stride 1280) buffer size 614400
8 buffers requested.
length: 614400 offset: 0 timestamp type: unknown
Buffer 0 mapped at a[22153.088039] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
[22153.096726] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
ddress 0xb6d7d000.
length: 614400 offset: 61440[22153.107537] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
[22153.116841] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
0 timestamp type: unknown
Buffer 1 mapped at ad[22153.127662] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
[22153.136949] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
dress 0xb6ce7000.
length: 614400 offset: 122880[22153.147786] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
[22153.157063] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
0 timestamp type: unknown
Buffer 2 mapped at ad[22153.167911] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
[22153.177172] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
dress 0xb6c51000.
length: 614400 offset: 184320[22153.187911] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
[22153.197282] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
0 timestamp type: unknown
Buffer 3 mapped at ad[22153.208036] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
[22153.217394] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
dress 0xb6bbb000.
length: 614400 offset: 245760[22153.228161] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
[22153.237504] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
0 timestamp type: unknown
Buffer 4 mapped at ad[22153.248285] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
[22153.257614] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
dress 0xb6b25000.
length: 614400 offset: 307200[22153.268411] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
[22153.277722] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
0 timestamp type: unknown
Buffer 5 mapped at ad[22153.288535] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
[22153.297831] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
dress 0xb6a8f000.
length: 614400 offset: 368640[22153.308661] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
[22153.317941] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
0 timestamp type: unknown
Buffer 6 mapped at ad[22153.328785] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
[22153.338052] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
dress 0xb69f9000.
length: 614400 offset: 430080[22153.348785] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
[22153.358162] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
0 timestamp type: unknown
Buffer 7 mapped at ad[22153.368910] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
[22153.378273] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
dress 0xb6963000.
[22153.389035] xhci-hcd xhci-hcd: ERROR Transfer event TRB DMA ptr not part of current TD
Is this a know issue? I will see if I can find an easier way to reproduce it.
Any advice on how to debug this would be most welcome!
-Jose
