diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.10/950-0355-xhci-quirks-add-link-TRB-quirk-for-VL805.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.10/950-0355-xhci-quirks-add-link-TRB-quirk-for-VL805.patch | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.10/950-0355-xhci-quirks-add-link-TRB-quirk-for-VL805.patch b/target/linux/bcm27xx/patches-5.10/950-0355-xhci-quirks-add-link-TRB-quirk-for-VL805.patch new file mode 100644 index 0000000000..1e1b9a9510 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.10/950-0355-xhci-quirks-add-link-TRB-quirk-for-VL805.patch @@ -0,0 +1,61 @@ +From be6ae78e28ff92b6da6af988f3013420af957481 Mon Sep 17 00:00:00 2001 +From: Jonathan Bell <jonathan@raspberrypi.org> +Date: Mon, 26 Oct 2020 14:03:35 +0000 +Subject: [PATCH] xhci: quirks: add link TRB quirk for VL805 + +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> +--- + drivers/usb/host/xhci-pci.c | 1 + + drivers/usb/host/xhci-ring.c | 10 ++++++++++ + drivers/usb/host/xhci.h | 1 + + 3 files changed, 12 insertions(+) + +--- a/drivers/usb/host/xhci-pci.c ++++ b/drivers/usb/host/xhci-pci.c +@@ -277,6 +277,7 @@ static void xhci_pci_quirks(struct devic + 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 && +--- a/drivers/usb/host/xhci-ring.c ++++ b/drivers/usb/host/xhci-ring.c +@@ -653,6 +653,16 @@ void xhci_find_new_dequeue_state(struct + + } 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; + +--- a/drivers/usb/host/xhci.h ++++ b/drivers/usb/host/xhci.h +@@ -1882,6 +1882,7 @@ struct xhci_hcd { + #define XHCI_SG_TRB_CACHE_SIZE_QUIRK BIT_ULL(39) + #define XHCI_NO_SOFT_RETRY BIT_ULL(40) + #define XHCI_EP_CTX_BROKEN_DCS BIT_ULL(41) ++#define XHCI_AVOID_DQ_ON_LINK BIT_ULL(42) + + unsigned int num_active_eps; + unsigned int limit_active_eps; |