On Monday 21 February 2005 2:24 pm, Chris Clayton wrote: > On Sun, 20 Feb 2005 08:39:51 +0000 > Chris Clayton <[EMAIL PROTECTED]> wrote: > > > Hi again. > > > > My word, I've put some hours into this, but I now have a 2.6.10 kernel with > > which the built-in USB port on my Compaq Armada 7400 works. So far that is, > > I > > want to do a bit more work on fine tuning the duration of the delays I have > > added to host/ohci-q.c::finish_unlinks() - 5 millseconds only works some of > > the time, 10 milliseconds seems to work all of the time. > > Mmm, spoke a bit too soon. Trying to find the sweet spot between 5 and 10 > millisecs, I'm currently at ...... 20 milliseconds. I had done some testing > yesterday, copying 5-6MB files to and from compact flash and over the > wireless network, and all was OK. However, tonight I've been copying a > kernel tarball around and getting timeouts again, so it looks like I've > got some more work to do. Sorry for the noise :)
That suggests a timeout isn't exactly the issue here ... it'd be more at the level of that (old) silicon wanting to get some register written, or maybe cleared. Random notion: before writing a new control or bulk list head, write a zero into that register and spin (up to a millisecond) until the next frame has started. One of the more subtle changes in that group of patches changed some behavior in that area, getting rid of a race. It's possible that the reason some earler code clobbered that register was because it was trying to run on hardware that misbehaved otherwise. > I would still value guidance on the questions I asked yetserday though. If you can find some approach that works reliably, I think the right way to package it would be by defining a new quirk flag and kicking in the logic that's needed on your chip. Then set that flag when the PCI probe detects this particular PCI vendor/product and this revision (or older). That way if someone sticks a "modern" CardBus controller into that laptop, this workaround would only apply to the built-in controller. - Dave ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
