linux-kernel - Re: [PATCH] usb: host: ehci: workaround PME bug on AMD EHCI controller

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Message-ID: <Pine.LNX.4.44L0.1706161327410.1715-100000@iolanthe.rowland.org>
Date:   Fri, 16 Jun 2017 13:30:15 -0400 (EDT)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
cc:     Bjorn Helgaas <helgaas@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        <gregkh@...uxfoundation.org>, USB list <linux-usb@...r.kernel.org>,
        <linux-pci@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        <linux-pm@...r.kernel.org>
Subject: Re: [PATCH] usb: host: ehci: workaround PME bug on AMD EHCI controller

On Sat, 17 Jun 2017, Kai-Heng Feng wrote:

> On Fri, Jun 16, 2017 at 11:07 AM, Kai-Heng Feng
> <kai.heng.feng@...onical.com> wrote:
> > On Thu, Jun 15, 2017 at 10:12 PM, Alan Stern <stern@...land.harvard.edu> wrote:
> >> Those documents refer to a hardware bug with a workaround in the BIOS.
> >> Have you checked to see if your BIOS is up to date?
> >
> > Yes, it's up to date.
> >
> 
> Alan, I re-sent a patch but I forgot to add you to CC list:
> http://marc.info/?l=linux-pci&m=149760607914628&w=2

Thanks for letting me know.  The patch seems reasonable.

Have you tested it with system suspend?  That is, if you suspend the 
whole computer, does plugging or unplugging a USB device cause the 
system to wake up?

Alan Stern