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

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From	Kai-Heng Feng <kai.heng.feng@canonical.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] usb: host: ehci: workaround PME bug on AMD EHCI controller
Date	Fri, 16 Jun 2017 05:10:02 +0200
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X-Original-Cc	Bjorn Helgaas <helgaas@kernel.org>, Bjorn Helgaas <bhelgaas@google.com>, gregkh@linuxfoundation.org, USB list <linux-usb@vger.kernel.org>, linux-pci@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>, "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>, linux-pm@vger.kernel.org
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On Thu, Jun 15, 2017 at 10:12 PM, Alan Stern <stern@rowland.harvard.edu> wrote:
> On Thu, 15 Jun 2017, Kai-Heng Feng wrote:
>
>> On Wed, Jun 14, 2017 at 1:28 AM, Bjorn Helgaas <helgaas@kernel.org> wrote:
>> >
>> > The lspci output [1] shows:
>> >
>> >   00:12.0 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB EHCI Controller (rev 39) (prog-if 20 [EHCI])
>> >     Capabilities: [c0] Power Management version 2
>> >       Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
>> >       Status: D3 NoSoftRst- PME-Enable+ DSel=0 DScale=0 PME-
>> >       Bridge: PM- B3+
>> >
>> > The device claims it can assert PME# from D3hot.  If it can't, that
>> > sounds like a hardware defect that should be addressed with a quirk.
>> > Ideally we would also have a pointer to the AMD hardware erratum.
>>
>> Looks like it's pretty similar to "23 USB Wake on Connect/Disconnect
>> with Low Speed Devices" in [1].
>> It points to a workaround in appendix A2 from [2].
>> However it says this bug only effects Low Speed devices, but it
>> actually also happens on High Speed devices.
>>
>> [1] https://support.amd.com/TechDocs/46837.pdf
>> [2] https://support.amd.com/TechDocs/42413.pdf
>
> 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 Stern
>

Thread

[PATCH] usb: host: ehci: workaround PME bug on AMD EHCI controller Kai-Heng Feng <kai.heng.feng@canonical.com> - 2017-06-09 09:30 +0200
  Re: [PATCH] usb: host: ehci: workaround PME bug on AMD EHCI controller Alan Stern <stern@rowland.harvard.edu> - 2017-06-09 16:50 +0200
    Re: [PATCH] usb: host: ehci: workaround PME bug on AMD EHCI controller Kai-Heng Feng <kai.heng.feng@canonical.com> - 2017-06-12 09:10 +0200
      Re: [PATCH] usb: host: ehci: workaround PME bug on AMD EHCI controller Kai-Heng Feng <kai.heng.feng@canonical.com> - 2017-06-12 12:20 +0200
        Re: [PATCH] usb: host: ehci: workaround PME bug on AMD EHCI controller Alan Stern <stern@rowland.harvard.edu> - 2017-06-12 16:20 +0200
          Re: [PATCH] usb: host: ehci: workaround PME bug on AMD EHCI controller Kai-Heng Feng <kai.heng.feng@canonical.com> - 2017-06-13 06:30 +0200
            Re: [PATCH] usb: host: ehci: workaround PME bug on AMD EHCI  controller Bjorn Helgaas <helgaas@kernel.org> - 2017-06-13 19:30 +0200
              Re: [PATCH] usb: host: ehci: workaround PME bug on AMD EHCI controller Alan Stern <stern@rowland.harvard.edu> - 2017-06-14 21:00 +0200
                Re: [PATCH] usb: host: ehci: workaround PME bug on AMD EHCI controller Kai-Heng Feng <kai.heng.feng@canonical.com> - 2017-06-15 09:10 +0200
                Re: [PATCH] usb: host: ehci: workaround PME bug on AMD EHCI  controller Bjorn Helgaas <helgaas@kernel.org> - 2017-06-15 15:30 +0200
              Re: [PATCH] usb: host: ehci: workaround PME bug on AMD EHCI controller Kai-Heng Feng <kai.heng.feng@canonical.com> - 2017-06-15 09:00 +0200
                Re: [PATCH] usb: host: ehci: workaround PME bug on AMD EHCI controller Alan Stern <stern@rowland.harvard.edu> - 2017-06-15 16:20 +0200
                Re: [PATCH] usb: host: ehci: workaround PME bug on AMD EHCI controller Kai-Heng Feng <kai.heng.feng@canonical.com> - 2017-06-16 05:10 +0200
                Re: [PATCH] usb: host: ehci: workaround PME bug on AMD EHCI controller Kai-Heng Feng <kai.heng.feng@canonical.com> - 2017-06-16 18:20 +0200
                Re: [PATCH] usb: host: ehci: workaround PME bug on AMD EHCI controller Alan Stern <stern@rowland.harvard.edu> - 2017-06-16 19:40 +0200
                Re: [PATCH] usb: host: ehci: workaround PME bug on AMD EHCI controller Kai-Heng Feng <kai.heng.feng@canonical.com> - 2017-06-19 05:40 +0200
                Re: [PATCH] usb: host: ehci: workaround PME bug on AMD EHCI  controller Bjorn Helgaas <helgaas@kernel.org> - 2017-06-19 19:50 +0200
                Re: [PATCH] usb: host: ehci: workaround PME bug on AMD EHCI controller Alan Stern <stern@rowland.harvard.edu> - 2017-06-19 20:40 +0200
                Re: [PATCH] usb: host: ehci: workaround PME bug on AMD EHCI controller "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-06-20 00:10 +0200

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