diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c index ac30afae35ccf5..fc20e43bd462fd 100644 --- a/drivers/usb/host/xhci-pci.c +++ b/drivers/usb/host/xhci-pci.c @@ -262,6 +262,7 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci) if (pdev->vendor == PCI_VENDOR_ID_VIA && pdev->device == 0x3483) { xhci->quirks |= XHCI_LPM_SUPPORT; xhci->quirks |= XHCI_EP_CTX_BROKEN_DCS; + xhci->quirks |= XHCI_AVOID_DQ_ON_LINK; } if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA && diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index bbc804fe5c3d46..48e1917a0e4b80 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -630,6 +630,16 @@ void xhci_find_new_dequeue_state(struct xhci_hcd *xhci, } while (!cycle_found || !td_last_trb_found); + /* + * Quirk: the xHC does not correctly parse link TRBs if the HW Dequeue + * pointer is set to one. Advance to the next TRB (and next segment). + */ + if (xhci->quirks & XHCI_AVOID_DQ_ON_LINK && trb_is_link(new_deq)) { + if (link_trb_toggles_cycle(new_deq)) + state->new_cycle_state ^= 0x1; + next_trb(xhci, ep_ring, &new_seg, &new_deq); + } + state->new_deq_seg = new_seg; state->new_deq_ptr = new_deq; diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 3b66d885cfc962..d5e6992c06e770 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1875,6 +1875,7 @@ struct xhci_hcd { #define XHCI_SNPS_BROKEN_SUSPEND BIT_ULL(35) #define XHCI_RENESAS_FW_QUIRK BIT_ULL(36) #define XHCI_EP_CTX_BROKEN_DCS BIT_ULL(37) +#define XHCI_AVOID_DQ_ON_LINK BIT_ULL(38) unsigned int num_active_eps; unsigned int limit_active_eps;