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SubjectRe: [PATCH] x86/defconfig: Enable CONFIG_USB_XHCI_HCD
On Mon, 8 Oct 2018, Greg Kroah-Hartman wrote:

> On Mon, Oct 08, 2018 at 12:32:23PM +0200, Adam Borowski wrote:
> > A spanking new machine I just got has all but one USB ports wired as 3.0.
> > Booting defconfig resulted in no keyboard or mouse, which was pretty
> > uncool. Let's enable that -- USB3 is ubiquitous rather than an oddity.
> > As 'y' not 'm' -- recovering from initrd problems needs a keyboard.
> >
> > Signed-off-by: Adam Borowski <kilobyte@angband.pl>
> > ---
> > arch/x86/configs/x86_64_defconfig | 1 +
> > 1 file changed, 1 insertion(+)
>
> defconfig for x86 actually still works? That's amazing in itself :)
>
> > diff --git a/arch/x86/configs/x86_64_defconfig b/arch/x86/configs/x86_64_defconfig
> > index e32fc1f274d8..ac9ae487cfeb 100644
> > --- a/arch/x86/configs/x86_64_defconfig
> > +++ b/arch/x86/configs/x86_64_defconfig
> > @@ -243,6 +243,7 @@ CONFIG_USB_HIDDEV=y
> > CONFIG_USB=y
> > CONFIG_USB_ANNOUNCE_NEW_DEVICES=y
> > CONFIG_USB_MON=y
> > +CONFIG_USB_XHCI_HCD=y
> > CONFIG_USB_EHCI_HCD=y
> > CONFIG_USB_EHCI_TT_NEWSCHED=y
> > CONFIG_USB_OHCI_HCD=y
>
> You can probably turn ehci and ohci off if you have xhci in the
> "default" system now.

Heh. My office PC has both EHCI and xHCI controllers, but it uses xHCI
_only_ for SuperSpeed devices, and only on some of the ports. Not a
combination I have heard of anywhere else. Enabling xHCI without EHCI
on that computer would be a bad idea. :-)

Alan Stern

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