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path: root/drivers/usb/host/xhci-ring.c
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Diffstat (limited to 'drivers/usb/host/xhci-ring.c')
-rw-r--r--drivers/usb/host/xhci-ring.c93
1 files changed, 76 insertions, 17 deletions
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 36c858e5b529..94e6934edb09 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -182,8 +182,12 @@ static void inc_deq(struct xhci_hcd *xhci, struct xhci_ring *ring, bool consumer
* set, but other sections talk about dealing with the chain bit set. This was
* fixed in the 0.96 specification errata, but we have to assume that all 0.95
* xHCI hardware can't handle the chain bit being cleared on a link TRB.
+ *
+ * @more_trbs_coming: Will you enqueue more TRBs before calling
+ * prepare_transfer()?
*/
-static void inc_enq(struct xhci_hcd *xhci, struct xhci_ring *ring, bool consumer)
+static void inc_enq(struct xhci_hcd *xhci, struct xhci_ring *ring,
+ bool consumer, bool more_trbs_coming)
{
u32 chain;
union xhci_trb *next;
@@ -199,15 +203,28 @@ static void inc_enq(struct xhci_hcd *xhci, struct xhci_ring *ring, bool consumer
while (last_trb(xhci, ring, ring->enq_seg, next)) {
if (!consumer) {
if (ring != xhci->event_ring) {
- if (chain) {
- next->link.control |= TRB_CHAIN;
-
- /* Give this link TRB to the hardware */
- wmb();
- next->link.control ^= TRB_CYCLE;
- } else {
+ /*
+ * If the caller doesn't plan on enqueueing more
+ * TDs before ringing the doorbell, then we
+ * don't want to give the link TRB to the
+ * hardware just yet. We'll give the link TRB
+ * back in prepare_ring() just before we enqueue
+ * the TD at the top of the ring.
+ */
+ if (!chain && !more_trbs_coming)
break;
+
+ /* If we're not dealing with 0.95 hardware,
+ * carry over the chain bit of the previous TRB
+ * (which may mean the chain bit is cleared).
+ */
+ if (!xhci_link_trb_quirk(xhci)) {
+ next->link.control &= ~TRB_CHAIN;
+ next->link.control |= chain;
}
+ /* Give this link TRB to the hardware */
+ wmb();
+ next->link.control ^= TRB_CYCLE;
}
/* Toggle the cycle bit after the last ring segment. */
if (last_trb_on_last_seg(xhci, ring, ring->enq_seg, next)) {
@@ -1071,6 +1088,15 @@ bandwidth_change:
xhci_warn(xhci, "Reset device command completion "
"for disabled slot %u\n", slot_id);
break;
+ case TRB_TYPE(TRB_NEC_GET_FW):
+ if (!(xhci->quirks & XHCI_NEC_HOST)) {
+ xhci->error_bitmask |= 1 << 6;
+ break;
+ }
+ xhci_dbg(xhci, "NEC firmware version %2x.%02x\n",
+ NEC_FW_MAJOR(event->status),
+ NEC_FW_MINOR(event->status));
+ break;
default:
/* Skip over unknown commands on the event ring */
xhci->error_bitmask |= 1 << 6;
@@ -1079,6 +1105,17 @@ bandwidth_change:
inc_deq(xhci, xhci->cmd_ring, false);
}
+static void handle_vendor_event(struct xhci_hcd *xhci,
+ union xhci_trb *event)
+{
+ u32 trb_type;
+
+ trb_type = TRB_FIELD_TO_TYPE(event->generic.field[3]);
+ xhci_dbg(xhci, "Vendor specific event TRB type = %u\n", trb_type);
+ if (trb_type == TRB_NEC_CMD_COMP && (xhci->quirks & XHCI_NEC_HOST))
+ handle_cmd_completion(xhci, &event->event_cmd);
+}
+
static void handle_port_status(struct xhci_hcd *xhci,
union xhci_trb *event)
{
@@ -1659,7 +1696,10 @@ void xhci_handle_event(struct xhci_hcd *xhci)
update_ptrs = 0;
break;
default:
- xhci->error_bitmask |= 1 << 3;
+ if ((event->event_cmd.flags & TRB_TYPE_BITMASK) >= TRB_TYPE(48))
+ handle_vendor_event(xhci, event);
+ else
+ xhci->error_bitmask |= 1 << 3;
}
/* Any of the above functions may drop and re-acquire the lock, so check
* to make sure a watchdog timer didn't mark the host as non-responsive.
@@ -1684,9 +1724,12 @@ void xhci_handle_event(struct xhci_hcd *xhci)
/*
* Generic function for queueing a TRB on a ring.
* The caller must have checked to make sure there's room on the ring.
+ *
+ * @more_trbs_coming: Will you enqueue more TRBs before calling
+ * prepare_transfer()?
*/
static void queue_trb(struct xhci_hcd *xhci, struct xhci_ring *ring,
- bool consumer,
+ bool consumer, bool more_trbs_coming,
u32 field1, u32 field2, u32 field3, u32 field4)
{
struct xhci_generic_trb *trb;
@@ -1696,7 +1739,7 @@ static void queue_trb(struct xhci_hcd *xhci, struct xhci_ring *ring,
trb->field[1] = field2;
trb->field[2] = field3;
trb->field[3] = field4;
- inc_enq(xhci, ring, consumer);
+ inc_enq(xhci, ring, consumer, more_trbs_coming);
}
/*
@@ -1965,6 +2008,7 @@ static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
int trb_buff_len, this_sg_len, running_total;
bool first_trb;
u64 addr;
+ bool more_trbs_coming;
struct xhci_generic_trb *start_trb;
int start_cycle;
@@ -2050,7 +2094,11 @@ static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
length_field = TRB_LEN(trb_buff_len) |
remainder |
TRB_INTR_TARGET(0);
- queue_trb(xhci, ep_ring, false,
+ if (num_trbs > 1)
+ more_trbs_coming = true;
+ else
+ more_trbs_coming = false;
+ queue_trb(xhci, ep_ring, false, more_trbs_coming,
lower_32_bits(addr),
upper_32_bits(addr),
length_field,
@@ -2101,6 +2149,7 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
int num_trbs;
struct xhci_generic_trb *start_trb;
bool first_trb;
+ bool more_trbs_coming;
int start_cycle;
u32 field, length_field;
@@ -2189,7 +2238,11 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
length_field = TRB_LEN(trb_buff_len) |
remainder |
TRB_INTR_TARGET(0);
- queue_trb(xhci, ep_ring, false,
+ if (num_trbs > 1)
+ more_trbs_coming = true;
+ else
+ more_trbs_coming = false;
+ queue_trb(xhci, ep_ring, false, more_trbs_coming,
lower_32_bits(addr),
upper_32_bits(addr),
length_field,
@@ -2268,7 +2321,7 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
/* Queue setup TRB - see section 6.4.1.2.1 */
/* FIXME better way to translate setup_packet into two u32 fields? */
setup = (struct usb_ctrlrequest *) urb->setup_packet;
- queue_trb(xhci, ep_ring, false,
+ queue_trb(xhci, ep_ring, false, true,
/* FIXME endianness is probably going to bite my ass here. */
setup->bRequestType | setup->bRequest << 8 | setup->wValue << 16,
setup->wIndex | setup->wLength << 16,
@@ -2284,7 +2337,7 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
if (urb->transfer_buffer_length > 0) {
if (setup->bRequestType & USB_DIR_IN)
field |= TRB_DIR_IN;
- queue_trb(xhci, ep_ring, false,
+ queue_trb(xhci, ep_ring, false, true,
lower_32_bits(urb->transfer_dma),
upper_32_bits(urb->transfer_dma),
length_field,
@@ -2301,7 +2354,7 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
field = 0;
else
field = TRB_DIR_IN;
- queue_trb(xhci, ep_ring, false,
+ queue_trb(xhci, ep_ring, false, false,
0,
0,
TRB_INTR_TARGET(0),
@@ -2338,7 +2391,7 @@ static int queue_command(struct xhci_hcd *xhci, u32 field1, u32 field2,
"unfailable commands failed.\n");
return -ENOMEM;
}
- queue_trb(xhci, xhci->cmd_ring, false, field1, field2, field3,
+ queue_trb(xhci, xhci->cmd_ring, false, false, field1, field2, field3,
field4 | xhci->cmd_ring->cycle_state);
return 0;
}
@@ -2378,6 +2431,12 @@ int xhci_queue_address_device(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr,
false);
}
+int xhci_queue_vendor_command(struct xhci_hcd *xhci,
+ u32 field1, u32 field2, u32 field3, u32 field4)
+{
+ return queue_command(xhci, field1, field2, field3, field4, false);
+}
+
/* Queue a reset device command TRB */
int xhci_queue_reset_device(struct xhci_hcd *xhci, u32 slot_id)
{
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.