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Commit 9aad95e2 authored by Hans de Goede's avatar Hans de Goede Committed by Sarah Sharp
Browse files

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



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: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
parent 95241dbd

drivers/usb/host/xhci-ring.c

+15 −7
Original line number Diff line number Diff line
@@ -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);

		}

	}

drivers/usb/host/xhci.h

+1 −0
Original line number Diff line number Diff line
@@ -703,6 +703,7 @@ struct xhci_ep_ctx { 


/* deq bitmasks */

#define EP_CTX_CYCLE_MASK		(1 << 0)

#define SCTX_DEQ_MASK			(~0xfL)





/**