linux-kernel - Re: [PATCH v3] xhci: Prevent runtime suspend on Etron EJ168

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Date:   Tue, 29 Sep 2020 00:42:52 +0300
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Mathias Nyman <mathias.nyman@...el.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "open list:USB XHCI DRIVER" <linux-usb@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] xhci: Prevent runtime suspend on Etron EJ168

On 28.9.2020 12.10, Kai-Heng Feng wrote:
> 
> 
>> On Jun 8, 2020, at 11:56, Kai-Heng Feng <kai.heng.feng@...onical.com> wrote:
>>
>>
>>
>>> On May 5, 2020, at 01:16, Kai-Heng Feng <kai.heng.feng@...onical.com> wrote:
>>>
>>> Etron EJ168 USB 3.0 Host Controller stops working after S3, if it was
>>> runtime suspended previously:
>>> [  370.080359] pci 0000:02:00.0: can't change power state from D3cold to D0 (config space inaccessible)
>>> [  370.080477] xhci_hcd 0000:04:00.0: can't change power state from D3cold to D0 (config space inaccessible)
>>> [  370.080532] pcieport 0000:00:1c.0: DPC: containment event, status:0x1f05 source:0x0200
>>> [  370.080533] pcieport 0000:00:1c.0: DPC: ERR_FATAL detected
>>> [  370.080536] xhci_hcd 0000:04:00.0: can't change power state from D3hot to D0 (config space inaccessible)
>>> [  370.080552] xhci_hcd 0000:04:00.0: AER: can't recover (no error_detected callback)
>>> [  370.080566] usb usb3: root hub lost power or was reset
>>> [  370.080566] usb usb4: root hub lost power or was reset
>>> [  370.080572] xhci_hcd 0000:04:00.0: Host halt failed, -19
>>> [  370.080574] xhci_hcd 0000:04:00.0: Host not accessible, reset failed.
>>> [  370.080575] xhci_hcd 0000:04:00.0: PCI post-resume error -19!
>>> [  370.080586] xhci_hcd 0000:04:00.0: HC died; cleaning up
>>>
>>> This can be fixed by not runtime suspend the controller at all.
>>>
>>> So disable runtime suspend for EJ168 xHCI device.
>>>
>>> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
>>
>> A gentle ping...
> 
> Another gentle ping...

Thanks, somehow I didn't notice this earlier.

Was the rootcause ever investigated?
Preventing runtime suspend looks like a quick fix to get rid of the issue, but 
possibly just hides some other underlying power management problem

-Mathias