From e210c422b6fdd2dc123bedc588f399aefd8bf9de Mon Sep 17 00:00:00 2001 From: Mathias Nyman Date: Mon, 12 Oct 2015 11:30:11 +0300 Subject: xhci: don't finish a TD if we get a short transfer event mid TD If the difference is big enough between the bytes asked and received in a bulk transfer we can get a short transfer event pointing to a TRB in the middle of the TD. We don't want to handle the TD yet as we will anyway receive a new event for the last TRB in the TD. Hold off from finishing the TD and removing it from the list until we receive an event for the last TRB in the TD Cc: stable Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci-ring.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 43291f93afeb..79e89e6aef73 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -2191,6 +2191,10 @@ static int process_bulk_intr_td(struct xhci_hcd *xhci, struct xhci_td *td, } /* Fast path - was this the last TRB in the TD for this URB? */ } else if (event_trb == td->last_trb) { + if (td->urb_length_set && trb_comp_code == COMP_SHORT_TX) + return finish_td(xhci, td, event_trb, event, ep, + status, false); + if (EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)) != 0) { td->urb->actual_length = td->urb->transfer_buffer_length - @@ -2242,6 +2246,12 @@ static int process_bulk_intr_td(struct xhci_hcd *xhci, struct xhci_td *td, td->urb->actual_length += TRB_LEN(le32_to_cpu(cur_trb->generic.field[2])) - EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)); + + if (trb_comp_code == COMP_SHORT_TX) { + xhci_dbg(xhci, "mid bulk/intr SP, wait for last TRB event\n"); + td->urb_length_set = true; + return 0; + } } return finish_td(xhci, td, event_trb, event, ep, status, false); -- cgit v1.2.3 From 3b4739b8951d650becbcd855d7d6f18ac98a9a85 Mon Sep 17 00:00:00 2001 From: Mathias Nyman Date: Mon, 12 Oct 2015 11:30:12 +0300 Subject: xhci: handle no ping response error properly If a host fails to wake up a isochronous SuperSpeed device from U1/U2 in time for a isoch transfer it will generate a "No ping response error" Host will then move to the next transfer descriptor. Handle this case in the same way as missed service errors, tag the current TD as skipped and handle it on the next transfer event. Cc: stable Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci-ring.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 79e89e6aef73..97ffe3997273 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -2284,6 +2284,7 @@ static int handle_tx_event(struct xhci_hcd *xhci, u32 trb_comp_code; int ret = 0; int td_num = 0; + bool handling_skipped_tds = false; slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags)); xdev = xhci->devs[slot_id]; @@ -2420,6 +2421,10 @@ static int handle_tx_event(struct xhci_hcd *xhci, ep->skip = true; xhci_dbg(xhci, "Miss service interval error, set skip flag\n"); goto cleanup; + case COMP_PING_ERR: + ep->skip = true; + xhci_dbg(xhci, "No Ping response error, Skip one Isoc TD\n"); + goto cleanup; default: if (xhci_is_vendor_info_code(xhci, trb_comp_code)) { status = 0; @@ -2556,13 +2561,18 @@ static int handle_tx_event(struct xhci_hcd *xhci, ep, &status); cleanup: + + + handling_skipped_tds = ep->skip && + trb_comp_code != COMP_MISSED_INT && + trb_comp_code != COMP_PING_ERR; + /* - * Do not update event ring dequeue pointer if ep->skip is set. - * Will roll back to continue process missed tds. + * Do not update event ring dequeue pointer if we're in a loop + * processing missed tds. */ - if (trb_comp_code == COMP_MISSED_INT || !ep->skip) { + if (!handling_skipped_tds) inc_deq(xhci, xhci->event_ring); - } if (ret) { urb = td->urb; @@ -2597,7 +2607,7 @@ cleanup: * Process them as short transfer until reach the td pointed by * the event. */ - } while (ep->skip && trb_comp_code != COMP_MISSED_INT); + } while (handling_skipped_tds); return 0; } -- cgit v1.2.3 From fd7cd061adcf5f7503515ba52b6a724642a839c8 Mon Sep 17 00:00:00 2001 From: Laura Abbott Date: Mon, 12 Oct 2015 11:30:13 +0300 Subject: xhci: Add spurious wakeup quirk for LynxPoint-LP controllers We received several reports of systems rebooting and powering on after an attempted shutdown. Testing showed that setting XHCI_SPURIOUS_WAKEUP quirk in addition to the XHCI_SPURIOUS_REBOOT quirk allowed the system to shutdown as expected for LynxPoint-LP xHCI controllers. Set the quirk back. Note that the quirk was originally introduced for LynxPoint and LynxPoint-LP just for this same reason. See: commit 638298dc66ea ("xhci: Fix spurious wakeups after S5 on Haswell") It was later limited to only concern HP machines as it caused regression on some machines, see both bug and commit: Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=66171 commit 6962d914f317 ("xhci: Limit the spurious wakeup fix only to HP machines") Later it was discovered that the powering on after shutdown was limited to LynxPoint-LP (Haswell-ULT) and that some non-LP HP machine suffered from spontaneous resume from S3 (which should not be related to the SPURIOUS_WAKEUP quirk at all). An attempt to fix this then removed the SPURIOUS_WAKEUP flag usage completely. commit b45abacde3d5 ("xhci: no switching back on non-ULT Haswell") Current understanding is that LynxPoint-LP (Haswell ULT) machines need the SPURIOUS_WAKEUP quirk, otherwise they will restart, and plain Lynxpoint (Haswell) machines may _not_ have the quirk set otherwise they again will restart. Signed-off-by: Laura Abbott Cc: Takashi Iwai Cc: Oliver Neukum [Added more history to commit message -Mathias] Cc: stable Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci-pci.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c index c79d33676672..c47d3e480586 100644 --- a/drivers/usb/host/xhci-pci.c +++ b/drivers/usb/host/xhci-pci.c @@ -147,6 +147,7 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci) if (pdev->vendor == PCI_VENDOR_ID_INTEL && pdev->device == PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI) { xhci->quirks |= XHCI_SPURIOUS_REBOOT; + xhci->quirks |= XHCI_SPURIOUS_WAKEUP; } if (pdev->vendor == PCI_VENDOR_ID_INTEL && (pdev->device == PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_XHCI || -- cgit v1.2.3