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SubjectRe: [PATCH v3] xhci: Prevent runtime suspend on Etron EJ168
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On 28.9.2020 12.10, Kai-Heng Feng wrote:
>
>
>> On Jun 8, 2020, at 11:56, Kai-Heng Feng <kai.heng.feng@canonical.com> wrote:
>>
>>
>>
>>> On May 5, 2020, at 01:16, Kai-Heng Feng <kai.heng.feng@canonical.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@canonical.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

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