> simon@xxxxxxxxxxxxxx wrote: >> > simon@xxxxxxxxxxxxxx wrote: >> >> Hi I am using a v4l2 usb video capturer (em28xx based), and it is >> working >> >> fine for around 5 minutes. However, it stops capturing after this >> time. >> >> >> >> There is no error message sent to kmsg ot the application, which >> >> apparently waits for more data to be received. >> >> >> >> The debug dump from usbmon is: >> >> >> > <snip usbmon dump> >> > >> >> >> >> I am using kernel 2.6.34-rc7, and now the E messages are shown. In >> kernels >> >> 2.6.33 and 2.6.32 the bus went on sending callbacks with 0s. >> >> I assume that there is still some work in progress on the ehci >> module, and >> >> eventually this issue will be solved. >> >> >> >> Also, when I stop the application the following message is shown: >> >> >> >> em28xx #0: cannot change alternate number to 0 (error=-110) >> >> >> > >> > Which processor and which board are you running this on? What is the >> > transceiver you are using? (We had issues due to inadequate >> capacitance >> > on some power rails, and poor board design). This could be one source >> > of your problem. >> > >> > Then again, you might be hitting an OMAP errata. >> > >> > Are you able to use the device after you load the EHCI module again? >> > >> >> I am using gumstix overo air board. >> >> I am using a hub attached to the overo, and the capturer >> attached to the device. >> >> Once I reload the ehci-hcd module, I have to replug either the usb hub >> or >> the capturer so that it is detected again by ehci. >> I mean, when I reload the ehci-hcd module the root hub is detected, but >> not the devices attached to it. >> > > What happens if you have the video capture device and another USB device > (a flash drive maybe) connected to the external hub? Does the other > device > also stop working when the video capture device fails? > > - Anand > The USB flash drive connected to the hub stops working once the capturer failed. I also get this error several times, until it gives up: hub 1-2:1.0: Cannot enable port 2. Maybe the USB cable is bad? hub 1-2:1.0: cannot disable port 2 (err = -110) hub 1-2:1.0: cannot reset port 2 (err = -110) ... hub 1-2:1.0: hub_port_status failed (err = -110) -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
