linux-kernel - Re: [PATCH] x86/defconfig: Enable CONFIG_USB_XHCI

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Date:   Mon, 8 Oct 2018 11:20:22 -0400 (EDT)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
cc:     Adam Borowski <kilobyte@...band.pl>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, <x86@...nel.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [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@...band.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