On Thu, Mar 12, 2015 at 11:15 AM, Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx> wrote:
> When a device with an isochronous endpoint is plugged into the Intel
> xHCI host controller, and the driver submits multiple frames per URB,
> the xHCI driver will set the Block Event Interrupt (BEI) flag on all
> but the last TD for the URB. This causes the host controller to place
> an event on the event ring, but not send an interrupt. When the last
> TD for the URB completes, BEI is cleared, and we get an interrupt for
> the whole URB.
>
> However, under Intel xHCI host controllers, if the event ring is full
> of events from transfers with BEI set, an "Event Ring is Full" event
> will be posted to the last entry of the event ring, but no interrupt
> is generated. Host will cease all transfer and command executions and
> wait until software completes handling the pending events in the event
> ring. That means xHC stops, but event of "event ring is full" is not
> notified. As the result, the xHC looks like dead to user.
>
> This patch is to apply XHCI_AVOID_BEI quirk to Intel xHC devices. And
> it should be backported to kernels as old as 3.0, that contains the
> commit 69e848c2090a ("Intel xhci: Support EHCI/xHCI port switching.").
>
> Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> ---
> drivers/usb/host/xhci-pci.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
> index fd53c9e..2af32e2 100644
> --- a/drivers/usb/host/xhci-pci.c
> +++ b/drivers/usb/host/xhci-pci.c
> @@ -115,6 +115,7 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
> if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
> xhci->quirks |= XHCI_LPM_SUPPORT;
> xhci->quirks |= XHCI_INTEL_HOST;
> + xhci->quirks |= XHCI_AVOID_BEI;
> }
> if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
> pdev->device == PCI_DEVICE_ID_INTEL_PANTHERPOINT_XHCI) {
> @@ -130,7 +131,6 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
> * PPT chipsets.
> */
> xhci->quirks |= XHCI_SPURIOUS_REBOOT;
> - xhci->quirks |= XHCI_AVOID_BEI;
> }
> if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
> pdev->device == PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI) {
> --
> 2.1.0
>
> --
This works for me...
Computer: Dell XPS13 9333
USB controller: Intel Corporation 8 Series USB xHCI HC (rev 04)
(prog-if 30 [XHCI])
Kernel: 3.19.1
USB Device: Hauppauge USB-Live2
Please let me know if I can help in any other way.
Tested-by: Alistair Grant <akgrant0710@xxxxxxxxx>
Thanks!
Alistair
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