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xhci: add quirk for host controllers that don't update endpoint DCS

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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>
This commit is contained in:
Jonathan Bell
2019-07-11 17:55:43 +01:00
committed by popcornmix
parent 26ba59e46b
commit 75e43cfc8b
3 changed files with 29 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/usb/host/xhci-pci.c
View File

@@ -269,8 +269,10 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
pdev->device == 0x3432)
xhci->quirks |= XHCI_BROKEN_STREAMS;
if (pdev->vendor == PCI_VENDOR_ID_VIA && pdev->device == 0x3483)
if (pdev->vendor == PCI_VENDOR_ID_VIA && pdev->device == 0x3483) {
xhci->quirks |= XHCI_LPM_SUPPORT;
xhci->quirks |= XHCI_EP_CTX_BROKEN_DCS;
}
if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
pdev->device == PCI_DEVICE_ID_ASMEDIA_1042_XHCI)

26
drivers/usb/host/xhci-ring.c
View File

@@ -533,7 +533,10 @@ void xhci_find_new_dequeue_state(struct xhci_hcd *xhci,
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;
@@ -571,7 +574,28 @@ void xhci_find_new_dequeue_state(struct xhci_hcd *xhci,
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;
/*

1
drivers/usb/host/xhci.h
View File

@@ -1879,6 +1879,7 @@ struct xhci_hcd {
#define XHCI_SKIP_PHY_INIT BIT_ULL(37)
#define XHCI_DISABLE_SPARSE BIT_ULL(38)
#define XHCI_SG_TRB_CACHE_SIZE_QUIRK BIT_ULL(39)
#define XHCI_EP_CTX_BROKEN_DCS BIT_ULL(40)
unsigned int num_active_eps;
unsigned int limit_active_eps;