linux-kernel - Re: [PATCH] xhci: Disable connect, disconnect and over-current wakeup on system suspend

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Message-ID: <CAAd53p5pxGfS0y260NsMF+m_Ota+d1ZKbtdq4dfM5s+T1z14bw@mail.gmail.com>
Date:   Fri, 18 Aug 2023 08:01:54 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     mathias.nyman@...el.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xhci: Disable connect, disconnect and over-current wakeup
 on system suspend

On Thu, Aug 17, 2023 at 10:22 PM Alan Stern <stern@...land.harvard.edu> wrote:
>
> On Thu, Aug 17, 2023 at 10:07:37AM -0400, Alan Stern wrote:
> > On Thu, Aug 17, 2023 at 05:33:05PM +0800, Kai-Heng Feng wrote:
> > > HP ProOne 440 G10 AIO sometimes cannot suspend as xHCI wakes up the
> > > system:
> > > [  445.814574] hub 2-0:1.0: hub_suspend
> > > [  445.814652] usb usb2: bus suspend, wakeup 0
> > > [  445.824629] xhci_hcd 0000:00:14.0: Port change event, 1-11, id 11, portsc: 0x202a0
> >
> > What is the meaning of the 0x202a0 bits?  What caused this wakeup?
>
> And more to the point, given that the previous line says "wakeup 0", why
> should any port change event cause a wakeup?

I think the controller and roothub have to deal with the interrupt
about disconnecting regardless of the remote wakeup setting.

Kai-Heng

>
> Alan Stern