mirror of
https://github.com/Ysurac/openmptcprouter.git
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69 lines
2.6 KiB
Diff
69 lines
2.6 KiB
Diff
From 5d9d9ba7547ad27d76dd36791f54a57ff555ff8a Mon Sep 17 00:00:00 2001
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From: Jonathan Bell <jonathan@raspberrypi.org>
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Date: Mon, 26 Oct 2020 14:03:35 +0000
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Subject: [PATCH] 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
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being set to a Link TRB. The hardware-maintained endpoint context ends up
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stuck at the address of the Link TRB, leading to erroneous ring expansion
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events whenever the enqueue pointer wraps to the dequeue position.
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If the search for the end of the current TD and ring cycle state lands on
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a Link TRB, move to the next segment.
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See: https://github.com/raspberrypi/linux/issues/3919
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Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
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---
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drivers/usb/host/xhci-pci.c | 1 +
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drivers/usb/host/xhci-ring.c | 10 ++++++++++
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drivers/usb/host/xhci.h | 1 +
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3 files changed, 12 insertions(+)
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diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
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index 5238fa29ea978..b975e6803d485 100644
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--- a/drivers/usb/host/xhci-pci.c
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+++ b/drivers/usb/host/xhci-pci.c
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@@ -251,6 +251,7 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
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pdev->device == 0x3483) {
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xhci->quirks |= XHCI_LPM_SUPPORT;
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xhci->quirks |= XHCI_EP_CTX_BROKEN_DCS;
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+ xhci->quirks |= XHCI_AVOID_DQ_ON_LINK;
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}
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if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
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diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
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index d99e636f3844c..8149abff857c2 100644
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--- a/drivers/usb/host/xhci-ring.c
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+++ b/drivers/usb/host/xhci-ring.c
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@@ -624,6 +624,16 @@ void xhci_find_new_dequeue_state(struct xhci_hcd *xhci,
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} while (!cycle_found || !td_last_trb_found);
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+ /*
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+ * Quirk: the xHC does not correctly parse link TRBs if the HW Dequeue
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+ * pointer is set to one. Advance to the next TRB (and next segment).
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+ */
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+ if (xhci->quirks & XHCI_AVOID_DQ_ON_LINK && trb_is_link(new_deq)) {
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+ if (link_trb_toggles_cycle(new_deq))
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+ state->new_cycle_state ^= 0x1;
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+ next_trb(xhci, ep_ring, &new_seg, &new_deq);
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+ }
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+
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state->new_deq_seg = new_seg;
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state->new_deq_ptr = new_deq;
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diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
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index 2033bb8683033..90ccc71231c1a 100644
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--- a/drivers/usb/host/xhci.h
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+++ b/drivers/usb/host/xhci.h
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@@ -1874,8 +1874,9 @@ struct xhci_hcd {
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#define XHCI_RESET_PLL_ON_DISCONNECT BIT_ULL(34)
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#define XHCI_SNPS_BROKEN_SUSPEND BIT_ULL(35)
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#define XHCI_EP_CTX_BROKEN_DCS BIT_ULL(36)
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#define XHCI_SKIP_PHY_INIT BIT_ULL(37)
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#define XHCI_DISABLE_SPARSE BIT_ULL(38)
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+#define XHCI_AVOID_DQ_ON_LINK BIT_ULL(39)
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unsigned int num_active_eps;
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unsigned int limit_active_eps;
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