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Date:   Wed, 6 Dec 2017 22:20:17 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     mathias.nyman@...el.com, Bjorn Helgaas <bhelgaas@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        USB list <linux-usb@...r.kernel.org>,
        linux-pci@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Joe Lee <asmt.swfae@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>, linux-pm@...r.kernel.org
Subject: Re: [PATCH] xhci: Fix front USB ports on ASUS PRIME B350M-A

On Wed, Dec 6, 2017 at 1:14 AM, Bjorn Helgaas <helgaas@...nel.org> wrote:
> [+cc Rafael, linux-pm]
>
> On Wed, Dec 06, 2017 at 12:22:42AM +0800, Kai-Heng Feng wrote:
>> The board in question has three XHCI HCs:
>> 02:00.0 USB controller [0c03]: Advanced Micro Devices, Inc. [AMD] USB 3.1 XHCI Controller [1022:43bb] (rev 02)
>> 04:00.0 USB controller [0c03]: ASMedia Technology Inc. Device [1b21:1343]
>> 0a:00.3 USB controller [0c03]: Advanced Micro Devices, Inc. [AMD] USB3 Host Controller [1022:145c]
>>
>> The front ports are connected to HC [1022:43bb] (02:00.0).
>>
>> After plugging high speed devices into front ports several times, it
>> stops responding to high speed devices. Super speed devices can still
>> get detected though.
>>
>> When I plugged a high speed device, [1b21:1343] (04:00.0) also got woke
>> up:
>> [  140.834823] xhci_hcd 0000:02:00.0: // Setting command ring address to 0xff73b001
>> [  140.838220] xhci_hcd 0000:02:00.0: xhci_resume: starting port polling.
>> [  140.838226] xhci_hcd 0000:02:00.0: xhci_hub_status_data: stopping port polling.
>> [  140.838266] xhci_hcd 0000:02:00.0: xhci_suspend: stopping port polling.
>> [  140.838362] xhci_hcd 0000:02:00.0: // Setting command ring address to 0xff73b001
>> [  140.858908] xhci_hcd 0000:04:00.0: // Setting command ring address to 0xfffd9001
>> [  140.862745] xhci_hcd 0000:04:00.0: xhci_resume: starting port polling.
>> [  140.862754] xhci_hcd 0000:04:00.0: xhci_hub_status_data: stopping port polling.
>> [  140.862760] xhci_hcd 0000:04:00.0: xhci_hub_status_data: stopping port polling.
>> [  140.862787] xhci_hcd 0000:04:00.0: xhci_suspend: stopping port polling.
>> [  140.862811] xhci_hcd 0000:04:00.0: // Setting command ring address to 0xfffd9001
>>
>> Seems like [1022:43bb] is wired to [1b21:1343] internally.
>>
>> Both HCs support D3hot PME, so I tried to disable D3cold on them.
>> Turns out disable D3cold on [1b21:1343] (04:00.0) can workaround the
>> issue for [1022:43bb] (02:00.0).
>>
>> Also, [1022:43bb] (02:00.0) sometimes failed to suspend:
>> [  549.114587] xhci_hcd 0000:02:00.0: WARN: xHC CMD_RUN timeout
>> [  549.114608] suspend_common(): xhci_pci_suspend+0x0/0xc0 returns -110
>> [  549.114638] xhci_hcd 0000:02:00.0: can't suspend (hcd_pci_runtime_suspend returned -110)
>> [  549.116744] usb usb3: root hub lost power or was reset
>> [  549.116746] usb usb4: root hub lost power or was reset
>>
>> Based on previous guesswork, the issue can be workaround by doing PCI
>> reset on [1b21:1343] (04:00.0).
>
> Naive questions: Does this indicate that xhci_hcd is lacking something
> in the "resume from D3cold" path?

I think it's not related to xhci_hcd, it's weird to 04:00.0 gets woke
up because
something plugged into 02:00.0's port at first place.

> Is there a bugzilla for this? If
> not, can you open one and attach the complete dmesg log and complete
> "lspci -vv" output (as root)?  Google found some possibly related
> issues but I can't quite tie them together yet.

https://bugzilla.kernel.org/show_bug.cgi?id=198097

>
> I don't have an issue with the quirk per se, but in general I think
> it's better to debug an issue than simply avoid it.

Thanks. I hope ASMedia can shed some light on this issue.

>
>> Cc: Joe Lee <asmt.swfae@...il.com>
>> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
>> ---
>>  drivers/pci/quirks.c          | 2 ++
>>  drivers/usb/host/pci-quirks.c | 3 +++
>>  2 files changed, 5 insertions(+)
>>
>> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
>> index 10684b17d0bd..380061dae51d 100644
>> --- a/drivers/pci/quirks.c
>> +++ b/drivers/pci/quirks.c
>> @@ -1699,6 +1699,8 @@ static void quirk_radeon_pm(struct pci_dev *dev)
>>  }
>>  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x6741, quirk_radeon_pm);
>>
>> +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ASMEDIA, 0x1343, pci_d3cold_disable);
>> +
>>  #ifdef CONFIG_X86_IO_APIC
>>  static int dmi_disable_ioapicreroute(const struct dmi_system_id *d)
>>  {
>> diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
>> index 161536717025..8c4318671e37 100644
>> --- a/drivers/usb/host/pci-quirks.c
>> +++ b/drivers/usb/host/pci-quirks.c
>> @@ -1176,6 +1176,9 @@ bool usb_xhci_needs_pci_reset(struct pci_dev *pdev)
>>           (pdev->device == 0x0014 || pdev->device == 0x0015))
>>               return true;
>>
>> +     if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA && pdev->device == 0x1343)
>> +             return true;
>> +
>>       return false;
>>  }
>>  EXPORT_SYMBOL_GPL(usb_xhci_needs_pci_reset);
>> --
>> 2.14.1
>>

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