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xhci: For streams the dequeue ptr must be read from the stream ctx

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This fixes TR dequeue validation failing on Intel XHCI controllers with the
following warning:

Mismatch between completed Set TR Deq Ptr command & xHCI internal state.

Interestingly enough reading the deq ptr from the ep ctx after a
TR Deq Ptr command does work on a Nec XHCI controller, it seems the Nec
writes the ptr to both the ep and stream contexts when streams are used.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
This commit is contained in:
Hans de Goede 2013-10-04 00:29:49 +02:00 committed by Sarah Sharp
parent 95241dbdf8
commit 9aad95e292
2 changed files with 16 additions and 7 deletions
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22
drivers/usb/host/xhci-ring.c
View File

@ -1081,12 +1081,14 @@ static void xhci_handle_cmd_set_deq(struct xhci_hcd *xhci, int slot_id,
unsigned int stream_id;
struct xhci_ring *ep_ring;
struct xhci_virt_device *dev;
struct xhci_virt_ep *ep;
struct xhci_ep_ctx *ep_ctx;
struct xhci_slot_ctx *slot_ctx;
ep_index = TRB_TO_EP_INDEX(le32_to_cpu(trb->generic.field[3]));
stream_id = TRB_TO_STREAM_ID(le32_to_cpu(trb->generic.field[2]));
dev = xhci->devs[slot_id];
ep = &dev->eps[ep_index];
ep_ring = xhci_stream_id_to_ring(dev, ep_index, stream_id);
if (!ep_ring) {
@ -1134,12 +1136,19 @@ static void xhci_handle_cmd_set_deq(struct xhci_hcd *xhci, int slot_id,
* cancelling URBs, which might not be an error...
*/
} else {
u64 deq;
/* 4.6.10 deq ptr is written to the stream ctx for streams */
if (ep->ep_state & EP_HAS_STREAMS) {
struct xhci_stream_ctx *ctx =
&ep->stream_info->stream_ctx_array[stream_id];
deq = le64_to_cpu(ctx->stream_ring) & SCTX_DEQ_MASK;
} else {
deq = le64_to_cpu(ep_ctx->deq) & ~EP_CTX_CYCLE_MASK;
}
xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
"Successful Set TR Deq Ptr cmd, deq = @%08llx",
le64_to_cpu(ep_ctx->deq));
if (xhci_trb_virt_to_dma(dev->eps[ep_index].queued_deq_seg,
dev->eps[ep_index].queued_deq_ptr) ==
(le64_to_cpu(ep_ctx->deq) & ~(EP_CTX_CYCLE_MASK))) {
"Successful Set TR Deq Ptr cmd, deq = @%08llx", deq);
if (xhci_trb_virt_to_dma(ep->queued_deq_seg,
ep->queued_deq_ptr) == deq) {
/* Update the ring's dequeue segment and dequeue pointer
* to reflect the new position.
*/
@ -1148,8 +1157,7 @@ static void xhci_handle_cmd_set_deq(struct xhci_hcd *xhci, int slot_id,
} else {
xhci_warn(xhci, "Mismatch between completed Set TR Deq Ptr command & xHCI internal state.\n");
xhci_warn(xhci, "ep deq seg = %p, deq ptr = %p\n",
dev->eps[ep_index].queued_deq_seg,
dev->eps[ep_index].queued_deq_ptr);
ep->queued_deq_seg, ep->queued_deq_ptr);
}
}

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

@ -703,6 +703,7 @@ struct xhci_ep_ctx {
/* deq bitmasks */
#define EP_CTX_CYCLE_MASK (1 << 0)
#define SCTX_DEQ_MASK (~0xfL)
/**