On Sat, Sep 02, 2006 at 11:52:57AM -0400, Alan Stern wrote: > 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.
In one situation yes, in another no. > 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. Yes. > If you plug another device into the external hub, nothing wakes up. Correct. > If you unplug the external hub from the computer, the root hub doesn't > wake up. Correct. > This seems very strange. Why should the root hub wake up when you connect > the external hub but not when you disconnect it? That seems to be the problem here :) > 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. There is nothing in the debug log when I remove the hub, or connect the device. > (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.) Care to make a fix? :) I don't have the time right now for the next few days to work much on this (family stuff.) Let me get back to you on Tuesday... thanks, greg k-h ------------------------------------------------------------------------- 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
