Hi Greg, The kernel is based on 3.4.11 from omapzoom.org (ti-ubuntu-3.4-1487) with Variscite BSP patches from: http://www.variwiki.com/index.php?title=VAR-SOM-OM44_-_Ubuntu_Precise I was expecting 200-250Mbps which is entirly possible on the same chip using its ehci-controller. musb seems to sustain this speed also, for most of the time, until a "glitch" like the one in the screenshot stalls the pipe. We don't want to use the ehci-controller because it's already bogged down with an ethernet controller. Regards, Frederik On Thursday 09 May 2013 08.12.47 Greg KH wrote: > On Thu, May 09, 2013 at 10:44:05AM +0200, Frederik Schmid wrote: > > Hi, > > > > I'm developing a camera application on a TI OMAP4460. I have a cmos > > usb-camera from IDS (UI-1551-LE-C-HQ) connected to the OTG-port (musb as > > host) on the OMAP. > > > > I get very poor frame rates with this setup reliably. The throughput rate > > is ~50-70Mbps. (1600x1200,8bpp,3-5fps) > > > > I uploaded a screenshot of a packet trace here: > > > > http://i.imgur.com/26XL23T.png > > > > The host seems to keep up with the camera most of the time but > > occasionally > > some kind of "glitch" causes the host to lag behind and the camera signals > > STALL because of buffer overrun. > > What kernel version are you using? And what data rate do you expect to > be getting with this hardware configuration? > > thanks, > > greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
