On Thu, 13 Feb 2014, Ben Collins wrote: > On Feb 13, 2014, at 10:19 AM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > > On Thu, 13 Feb 2014, Peter Chen wrote: > > > >>>> - If you have a usb bus analyzer, please check if the GET_DESCRPTOR sends out successfully. > >>>> (Most probably, I don't think it sends out) > >>> > >>> I've attached a screen cap of the USB capture. At the to in red is the "SETUP txn" that fails in u-boot (shows Timed Out). Below on the second capture, the Get Descriptor succeeds to the same device, but this time from Linux. > > > > Have you compared the capture result with the same thing on a Linux PC? > > > > Can you make the capture data available publicly? > > Meant to add that the capture data is two captures. One is u-boot, the other is Linux. The SETUP packets look identical. > > I feel like this problem is completely in the driver. Something is not getting configured correctly with the qH/qTD. I'm still working on getting the Linux side of this out. I agree, that's what it looks like. The problem may have something to do with the fact that the keyboard's internal hub runs at full speed. The other devices you tested, which worked okay, would have been low speed and high speed but not full speed. 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
