diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0272-xhci-add-quirk-for-host-controllers-that-don-t-updat.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0272-xhci-add-quirk-for-host-controllers-that-don-t-updat.patch | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0272-xhci-add-quirk-for-host-controllers-that-don-t-updat.patch b/target/linux/bcm27xx/patches-5.4/950-0272-xhci-add-quirk-for-host-controllers-that-don-t-updat.patch new file mode 100644 index 0000000000..2044aa2bd9 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0272-xhci-add-quirk-for-host-controllers-that-don-t-updat.patch @@ -0,0 +1,90 @@ +From 7bb9b7d36fa457a9fc463108d1228fd318891da4 Mon Sep 17 00:00:00 2001 +From: Jonathan Bell <jonathan@raspberrypi.org> +Date: Thu, 11 Jul 2019 17:55:43 +0100 +Subject: [PATCH] xhci: add quirk for host controllers that don't + update endpoint DCS + +Seen on a VLI VL805 PCIe to USB controller. For non-stream endpoints +at least, if the xHC halts on a particular TRB due to an error then +the DCS field in the Out Endpoint Context maintained by the hardware +is not updated with the current cycle state. + +Using the quirk XHCI_EP_CTX_BROKEN_DCS and instead fetch the DCS bit +from the TRB that the xHC stopped on. + +See: https://github.com/raspberrypi/linux/issues/3060 + +Signed-off-by: Jonathan Bell <jonathan@raspberrypi.org> +--- + drivers/usb/host/xhci-pci.c | 4 +++- + drivers/usb/host/xhci-ring.c | 26 +++++++++++++++++++++++++- + drivers/usb/host/xhci.h | 1 + + 3 files changed, 29 insertions(+), 2 deletions(-) + +--- a/drivers/usb/host/xhci-pci.c ++++ b/drivers/usb/host/xhci-pci.c +@@ -242,8 +242,10 @@ static void xhci_pci_quirks(struct devic + xhci->quirks |= XHCI_BROKEN_STREAMS; + + if (pdev->vendor == PCI_VENDOR_ID_VIA && +- pdev->device == 0x3483) ++ pdev->device == 0x3483) { + xhci->quirks |= XHCI_LPM_SUPPORT; ++ xhci->quirks |= XHCI_EP_CTX_BROKEN_DCS; ++ } + + if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA && + pdev->device == 0x1042) +--- a/drivers/usb/host/xhci-ring.c ++++ b/drivers/usb/host/xhci-ring.c +@@ -527,7 +527,10 @@ void xhci_find_new_dequeue_state(struct + struct xhci_virt_ep *ep = &dev->eps[ep_index]; + struct xhci_ring *ep_ring; + struct xhci_segment *new_seg; ++ struct xhci_segment *halted_seg = NULL; + union xhci_trb *new_deq; ++ union xhci_trb *halted_trb; ++ int index = 0; + dma_addr_t addr; + u64 hw_dequeue; + bool cycle_found = false; +@@ -548,7 +551,28 @@ void xhci_find_new_dequeue_state(struct + hw_dequeue = xhci_get_hw_deq(xhci, dev, ep_index, stream_id); + new_seg = ep_ring->deq_seg; + new_deq = ep_ring->dequeue; +- state->new_cycle_state = hw_dequeue & 0x1; ++ ++ /* ++ * Quirk: xHC write-back of the DCS field in the hardware dequeue ++ * pointer is wrong - use the cycle state of the TRB pointed to by ++ * the dequeue pointer. ++ */ ++ if (xhci->quirks & XHCI_EP_CTX_BROKEN_DCS && ++ !(ep->ep_state & EP_HAS_STREAMS)) ++ halted_seg = trb_in_td(xhci, cur_td->start_seg, ++ cur_td->first_trb, cur_td->last_trb, ++ hw_dequeue & ~0xf, false); ++ if (halted_seg) { ++ index = ((dma_addr_t)(hw_dequeue & ~0xf) - halted_seg->dma) / ++ sizeof(*halted_trb); ++ halted_trb = &halted_seg->trbs[index]; ++ state->new_cycle_state = halted_trb->generic.field[3] & 0x1; ++ xhci_dbg(xhci, "Endpoint DCS = %d TRB index = %d cycle = %d\n", ++ (u8)(hw_dequeue & 0x1), index, ++ state->new_cycle_state); ++ } else { ++ state->new_cycle_state = hw_dequeue & 0x1; ++ } + state->stream_id = stream_id; + + /* +--- a/drivers/usb/host/xhci.h ++++ b/drivers/usb/host/xhci.h +@@ -1867,6 +1867,7 @@ struct xhci_hcd { + #define XHCI_DEFAULT_PM_RUNTIME_ALLOW BIT_ULL(33) + #define XHCI_RESET_PLL_ON_DISCONNECT BIT_ULL(34) + #define XHCI_SNPS_BROKEN_SUSPEND BIT_ULL(35) ++#define XHCI_EP_CTX_BROKEN_DCS BIT_ULL(36) + + unsigned int num_active_eps; + unsigned int limit_active_eps; |