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SubjectRe: [PATCH v3] xhci: Prevent runtime suspend on Etron EJ168
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> 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...

>
>> ---
>> v3:
>> - Balance rpm refcount in remove callback.
>>
>> v2:
>> - Use a new quirk to avoid changing existing behavior.
>>
>> drivers/usb/host/xhci-pci.c | 7 ++++++-
>> drivers/usb/host/xhci.h | 1 +
>> 2 files changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
>> index 766b74723e64..67b4b433a93e 100644
>> --- a/drivers/usb/host/xhci-pci.c
>> +++ b/drivers/usb/host/xhci-pci.c
>> @@ -227,6 +227,7 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
>> xhci->quirks |= XHCI_RESET_ON_RESUME;
>> xhci->quirks |= XHCI_TRUST_TX_LENGTH;
>> xhci->quirks |= XHCI_BROKEN_STREAMS;
>> + xhci->quirks |= XHCI_DISABLE_RUNTIME_SUSPEND;
>> }
>> if (pdev->vendor == PCI_VENDOR_ID_RENESAS &&
>> pdev->device == 0x0014) {
>> @@ -371,7 +372,8 @@ static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
>> xhci->shared_hcd->can_do_streams = 1;
>>
>> /* USB-2 and USB-3 roothubs initialized, allow runtime pm suspend */
>> - pm_runtime_put_noidle(&dev->dev);
>> + if (!(xhci->quirks & XHCI_DISABLE_RUNTIME_SUSPEND))
>> + pm_runtime_put_noidle(&dev->dev);
>>
>> if (xhci->quirks & XHCI_DEFAULT_PM_RUNTIME_ALLOW)
>> pm_runtime_allow(&dev->dev);
>> @@ -397,6 +399,9 @@ static void xhci_pci_remove(struct pci_dev *dev)
>> if (xhci->quirks & XHCI_DEFAULT_PM_RUNTIME_ALLOW)
>> pm_runtime_forbid(&dev->dev);
>>
>> + if (!(xhci->quirks & XHCI_DISABLE_RUNTIME_SUSPEND))
>> + pm_runtime_get_noresume(&dev->dev);
>> +
>> if (xhci->shared_hcd) {
>> usb_remove_hcd(xhci->shared_hcd);
>> usb_put_hcd(xhci->shared_hcd);
>> diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
>> index 86cfefdd6632..d9c209a10d3f 100644
>> --- a/drivers/usb/host/xhci.h
>> +++ b/drivers/usb/host/xhci.h
>> @@ -1873,6 +1873,7 @@ struct xhci_hcd {
>> #define XHCI_DEFAULT_PM_RUNTIME_ALLOW BIT_ULL(33)
>> #define XHCI_RESET_PLL_ON_DISCONNECT BIT_ULL(34)
>> #define XHCI_SNPS_BROKEN_SUSPEND BIT_ULL(35)
>> +#define XHCI_DISABLE_RUNTIME_SUSPEND BIT_ULL(36)
>>
>> unsigned int num_active_eps;
>> unsigned int limit_active_eps;
>> --
>> 2.17.1
>>
>

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