On Wednesday 19 January 2005 11:42 am, Jesse Barnes wrote: > On Wednesday, January 19, 2005 11:20 am, David Brownell wrote: > > What happens when you load EHCI _only_ ? Normally loading that driver > > won't cause any interrupts at all, until some device is connected. > > Yep, that's what happens. I have a USB 1.1 kbd plugged into the 2.0 port and > I don't see any interrupts: > > 67: 0 0 0 0 SN hub ehci_hcd
Well that seems wrong. The USB signaling should have woken up the EHCI driver, causing an IRQ, when that keyboard was plugged in. (Though that's only _needed_ for now when the port issues RESUME signaling.) Specifically a Port Change Detect (PCD) IRQ ... if you build with CONFIG_USB_DEBUG, then the /sys/class/usb_host/usb1/registers file should reflect some wierdness. And the dmesg trace should show that khubd noticed a device there, and caused it to be handed off to the (OHCI) companion controller. - Dave > > Then there are basically two paths: (a) it's a full/low speed device, > > handled by OHCI (or on some cards, UHCI); or (b) it's a high speed device, > > handled by EHCI. To test the latter, I suggest you grab a USB 2.0 hub; > > the slim 4 port ones using Mini-B connectors, just a bit bigger than a > > credit card, are the most featureful. (They have Cypress chips that have > > a transaction translator on each port; which means you can hook up a lot > > more full and low speed devices downstream. All controlled by EHCI.) > > Ok, that's worth a try to make sure EHCI is working at all (I suspect it is). > > > Maybe you have issues with IRQ sharing? > > Quite possible since it looks like the EHCI chip shares an IRQ with one of > the > OHCI chips. I'll take a look at that. > > Thanks, > Jesse > ------------------------------------------------------- This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting Tool for open source databases. Create drag-&-drop reports. Save time by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc. Download a FREE copy at http://www.intelliview.com/go/osdn_nl _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
