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

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Message-ID: <Y1tyldAD/nDIoL3d@kroah.com>
Date:   Fri, 28 Oct 2022 08:11:33 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Reka Norman <rekanorman@...omium.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 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?

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.

thanks,

greg k-h