linux-kernel - Re: [PATCH] xhci: Apply XHCI_RESET_TO

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Message-ID: <CAEmPcwvCs3c0z5BhicGfagNyDCLTkWkYYW2ftb0guR5Y+8uoHA@mail.gmail.com>
Date:   Mon, 31 Oct 2022 14:54:59 +1100
From:   Reka Norman <rekanorman@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Mathias Nyman <mathias.nyman@...el.com>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH] xhci: Apply XHCI_RESET_TO_DEFAULT quirk to ADL-N

On Fri, Oct 28, 2022 at 5:10 PM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Fri, Oct 28, 2022 at 10:56:56AM +1100, Reka Norman wrote:
> > On Thu, Oct 27, 2022 at 5:11 PM Greg Kroah-Hartman
> > <gregkh@...uxfoundation.org> wrote:
> > >
> > > On Thu, Oct 27, 2022 at 04:34:07PM +1100, Reka Norman wrote:
> > > > ADL-N systems have the same issue as ADL-P, where a large boot firmware
> > > > delay is seen if USB ports are left in U3 at shutdown. So apply the
> > > > XHCI_RESET_TO_DEFAULT quirk to ADL-N as well.
> > > >
> > > > This patch depends on "xhci: Add quirk to reset host back to default
> > > > state at shutdown".
> > >
> > > What is the git commit id of that change?
> >
> > It hasn't been merged in mainline yet, only in the xhci tree:
> > https://git.kernel.org/pub/scm/linux/kernel/git/mnyman/xhci.git/commit/?id=feb0b04b09c82589af65c84398b7d3fefaa7b7ac&head=for-usb-linus
> > Should I add the commit id from there? Or add the lore link?
>
> This is in linux-next already as 34cd2db408d5 ("xhci: Add quirk to reset
> host back to default state at shutdown") right?

Yes it is, my bad. Added in v2.

>
> Please use that.
>
> > > And is this needed in stable kernels?  If so, how far back?
> >
> > Sorry, I'm not sure how to answer that properly.
> > It looks like most ADL-N support was added starting from 5.16.
> > The issue it fixes is a ~20s boot delay in the specific case of booting from S5.
> > It probably makes sense for it to go wherever the ADL-P patch goes.
>
> Then properly mark it with that information.

Done in v2.

Thanks.

>
> thanks,
>
> greg k-h