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4.2.0 usb problem - DragonBoard410c - 96Boards Forum

4.2.0 usb problem

Products Support DragonBoard410c
#1

Hello

I’m interfacing an usb camera with the dragonboard and I’ve some problem with the usb bus.
Cpufreq is configured with “preformance” governor, I’ve checked the cpu speed it stay set to 1.2GHz.
The camera is streaming raw bayer images on a bulk interface and I’m getting only some part of the image (~20%). The camera is streaming a 640x480x8bpp image at 15fps.
BTW, the same camera run fine on a beaglebone black, thus the dragonboard should be more than enough to run it.
I have an usb keyboard connected to the board and while the camera is streaming some keypress are lost (almost half). So the usb is definitely loosing some packets.

Is this a known issue ?
Is there any workaround ?
Any pointer where to start looking at ?

Thanks,

Philippe

#2

hi,

which release/build are you using?

there were USB issues that were fixed recently (it was discussed in a recent post).

#3

Hi,

I’m the ubuntu version with this kernel:
linaro@linaro-alip:~$ uname -a
Linux linaro-alip 4.2.0-linaro-lt-qcom #1 SMP PREEMPT Wed Sep 30 18:55:59 UTC 2015 aarch64 aarch64 aarch64 GNU/Linux

#4

ok, i think this issue should be fixed if you use this build:

http://builds.96boards.org/snapshots/dragonboard410c/linaro/ubuntu/111/

you either need to reflash the board, or recompile the kernel and modules and install the modules in your existing image.

#5

Thanks, using the last build fix the problem !