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

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Message-ID: <20181008164811.oydbuy2xu2d72y5f@angband.pl>
Date:   Mon, 8 Oct 2018 18:48:11 +0200
From:   Adam Borowski <kilobyte@...band.pl>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     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, Oct 08, 2018 at 03:19:44PM +0200, 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 :)

IIRC Gentoo even suggests it in the install instructions (although I
haven't looked at Gentoo in quite a while).  Other distros have handcrafted
approximations of allmodconfig.
 
> > +CONFIG_USB_XHCI_HCD=y
> >  CONFIG_USB_EHCI_HCD=y
> >  CONFIG_USB_OHCI_HCD=y
> 
> You can probably turn ehci and ohci off if you have xhci in the
> "default" system now.

Besides mixed wiring (as Alan and Randy mentioned), some machines without
USB3 are still usable.  I haven't upgraded my home machine in ages -- yet
despite it being an ancient Phenom2 x6 it builds defconfig in 6m 13s while
this fresh work box in 3m something.  Defconfig is supposed to handle a wide
range of common hardware, so keeping support for 2011 stuff would be wise.

As for !x86, I see that defconfigs for non-fringe archs already enable XHCI.


Meow!
-- 
⢀⣴⠾⠻⢶⣦⠀ 
⣾⠁⢰⠒⠀⣿⡁ 10 people enter a bar: 1 who understands binary,
⢿⡄⠘⠷⠚⠋⠀ 1 who doesn't, D who prefer to write it as hex,
⠈⠳⣄⠀⠀⠀⠀ and 1 who narrowly avoided an off-by-one error.