On Fri, 17 Sep 2010, Martin Schiller wrote: > Hi, > > I've got some problems with EHCI on an AMD Geode LX platform with the CS5536 companion: > > Some facts: > - The problem only occurs when using EHCI with the USB-Ports from the CS5536. > - When I rmmod the ehci-hcd and just use ohci, everything works well. > - When I use EHCI with another USB 2.0 PCI-Controller on the same mainboard, everything works well. > > I can also reproduce this on 3 different mainboards from different manufacturers, which all use this same chipset. > So this must have something to do with the CS5536 EHCI combination. > > I'm using linux-2.6.31.4, but have also tested linux-2.6.34.4 in openSUSE 11.3 with the same results. > > The USB devices I use are all 3G mPCIe Modules with USB 2.0 support from different Vendors. > The one, with which I can reproduce the error the easiest way is a Sierra Wireless MC8790. > > I only start a simple perl script (using CPAN module Device::SerialPort), which does nothing else than open and close one serial port of the modem in an infinit loop. > After a few seconds the script hangs and can't be killed any more. Only a reboot can fix it. > > Here are the DEBUG messages of ehci-hcd (with VERBOSE_DEBUG and EHCI_URB_TRACE enabled): ... > And here are some register dumps of the EHCI: ... > So what can we do, to find the reason for this? You can try setting the broken_periodic flag. Alan Stern -- 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
