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xhci: quirks: add link TRB quirk for VL805

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The VL805 controller can't cope with the TR Dequeue Pointer for an endpoint
being set to a Link TRB. The hardware-maintained endpoint context ends up
stuck at the address of the Link TRB, leading to erroneous ring expansion
events whenever the enqueue pointer wraps to the dequeue position.

If the search for the end of the current TD and ring cycle state lands on
a Link TRB, move to the next segment.

See: https://github.com/raspberrypi/linux/issues/3919

Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
This commit is contained in:
Jonathan Bell
2020-10-26 14:03:35 +00:00
committed by Dom Cobley
parent d4fe4acf93
commit 61ae192e41
3 changed files with 11 additions and 0 deletions
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1
drivers/usb/host/xhci-pci.c
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@@ -295,6 +295,7 @@ 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 &&

9
drivers/usb/host/xhci-ring.c
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@@ -667,6 +667,15 @@ static int xhci_move_dequeue_past_td(struct xhci_hcd *xhci,
} while (!cycle_found || !td_last_trb_found);
deq_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))
new_cycle ^= 0x1;
next_trb(xhci, ep_ring, &new_seg, &new_deq);
}
/* Don't update the ring cycle state for the producer (us). */
addr = xhci_trb_virt_to_dma(new_seg, new_deq);

1
drivers/usb/host/xhci.h
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@@ -1899,6 +1899,7 @@ struct xhci_hcd {
#define XHCI_EP_CTX_BROKEN_DCS BIT_ULL(42)
#define XHCI_SUSPEND_RESUME_CLKS BIT_ULL(43)
#define XHCI_RESET_TO_DEFAULT BIT_ULL(44)
#define XHCI_AVOID_DQ_ON_LINK BIT_ULL(45)
unsigned int num_active_eps;
unsigned int limit_active_eps;