On Tue, Jun 08, 2010 at 10:07:47AM +0200, Clemens Ladisch wrote: > Sarah Sharp wrote: > > Do any other USB hosts support MSI/MSI-X? A quick grep in the > > drivers/usb/host/ directory says no. > > There are several hardware implementations where MSI actually works. > > The [EOU]HCI drivers don't have MSI support because there have been > too many hardware bugs, but I'd guess a whitelist would work. > > > Are there any plans to add MSI support to a USB host? > > Yes. > > On my machine, I have working MSI support for all USB hosts in my AMD > SB710, but it's a horrible hack at the moment. Due to lack of time, > I've waited to see if I could eventually reuse any of your code. :) Dong's final patch is out, so if there is any code you can reuse, feel free to refactor it into the USB core. > > If so, it might be useful to introduce a new HCD driver function to > > enable MSI, which the USB core can call in usb_add_hcd(). The hosts > > could have a flag to indicate whether they are designed to handle > > MSI/MSI-X. > > Instead of a flag in struct hc_driver, we'd need another callback to be > able to do the per-device whitelisting checks. Where do you propose the callback be used? In usb_add_hcd() or somewhere else, like pci-quirks.c? Sarah Sharp -- 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
