Joel, On Wed, Oct 24, 2018 at 05:31:25PM +0200, Joel Pepper wrote: > Hi Joseph, Hi Bin, > > I am currently investigating a bug with the BeagleBoneBlack (which also > uses the AM335x) and a Logitech Webcam, which might be connected. > > I am using a Logitech C270 and if I set the format to YUYV and the > framesize to 544x288 or larger (including specifically 640x480), any > ioctl VIDIOC_DQBUF will hang indefinetely. This might be the underlying > source of the timeout Joseph encountered. > > Joseph, > > have you tried setting the camera to the lowest resolution it can go? If > low resolutions work, but higher ones, like 640x480 don't, we might be > chasing the same problem. If not, I will look into my problem separately > and open a new thread. > > > Bin, > > my case happened using ISOC transfers, but my preliminary investigation > has shown lots of ISOC traffic flowing, apparently successfuly from the > camera to the BBB, which makes me suspect a problem closer to the > v4l2/musb boundary, but I'm still reading into the code. If you would > like to investigate that further, the C270 is rather affordable, but I > will gladly provide any details, usbmon captures etc. that you require.
I am aware of an issue for 640x480@30fps with some cameras. I am in full-day meetings this week. Once I get time, I will provide more details for the issue I know of to see if you have face the same. Regards, -Bin.
