On Thu, 2 Aug 2007, David Engraf wrote:
> This would be solution too, but what if someone uses the uhci controller
> and don't want the
> ehci. So a single Kconfig flag wouldn't be enough, we have to add 3
> flags for uchi, ohci and
> ehci. I think this maybe a little bit difficult when configuring the kernel.
> The best solution would be when we could use the CONFIG_USB_xxxx_HCD
> flag, but it
> seems that some hardware has problems when we disable the handoff and
> let the BIOS
> control the usb controller. Do you know any of this hardware?
The email messages are hidden in the depths of the linux-usb-devel
archives. Maybe you can find them by checking the Git history for
drivers/usb/host/pci-quirks.c, finding the dates for patches that
affected the handoff code, and then searching through the archives near
those dates.
IIRC the problems arose on some MIPS machines. And I don't think the
problem involved letting the firmware manage the USB controller; I
think the problem came when the controller driver tried to do the
handoff later on.
Alan Stern
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