On Fri, 1 Sep 2006, Greg KH wrote: > On Fri, Sep 01, 2006 at 10:27:03PM -0700, Greg KH wrote: > > On Wed, Aug 30, 2006 at 03:47:31PM -0400, Alan Stern wrote: > > > > > > We never resolved the questions about this patch. I'm including it here > > > so that people can try it out and see what happens both with and without > > > it. > > > > > > Here's a good test scenario: Unplug all your USB devices and wait a few > > > seconds for the controllers to autosuspend. Then try plugging in a > > > device. Does the host controller notice it and wake up? > > > > No, my USB 2.0 hub in my monitor does not wake up, with this patch :( > > > > People aren't going to like not being able to use their hubs anymore... > > > > Hm, I plugged a different 2.0 hub into my root port, and it showed up. > > Then it suspended. Plugged a device into it, nothing. Removed the hub, > > nothing then either. The ehci driver still thinks this hub is present > > :( > > Tried it with the same hub in my laptop (different ehci controller). > Same thing happened :(
Let's see if I understand this right: You start out with nothing plugged in, and your EHCI root hub is suspended. Then you plug in a 2.0 hub; the root hub wakes up and recognizes the external hub. 2 seconds later the external hub gets suspended and 2 seconds after that the root hub gets suspended. If you plug another device into the external hub, nothing wakes up. If you unplug the external hub from the computer, the root hub doesn't wake up. This seems very strange. Why should the root hub wake up when you connect the external hub but not when you disconnect it? Seeing the dmesg log might help. You might also want to add some debugging printk's to ehci_irq() in ehci-hcd.c, especially in the "if (status & STS_PCD)" section. (Hmmm, looking at that code it appears that "status" is not handled very well. The result from readl(&ehci->regs->command) shouldn't be allowed to overwrite it.) Alan Stern ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
