Using TRB_CYCLE makes it clearer that the ring->cycle_state value is used when
writing to the actual ring itself.
Always use ^= TRB_CYCLE to invert the bit.
Revert the part of 186a7ef13a8f (xHCI: set cycle state when allocate rings)
that passed the cycle state to xhci_ring_alloc() and xhci_initialize_ring_info()
as these are only called for new rings and always passed 1 (TRB_CYCLE).
Signed-off-by: David Laight <david.lai...@aculab.com>
---
Changes for v2:
1: Adjusted so that is applies to HEAD
2: Added signed-off
Changes for v3:
1: Changed for additional lines (assignd to new_cycle_state).
2: Removed the cycle_state parameter - also shortens some overlong lines.
drivers/usb/host/xhci-mem.c | 37 ++++++++++++++-----------------------
drivers/usb/host/xhci-ring.c | 22 +++++++++++-----------
drivers/usb/host/xhci.c | 2 +-
3 files changed, 26 insertions(+), 35 deletions(-)
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 49b8bd0..706b530 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -161,8 +161,7 @@ void xhci_ring_free(struct xhci_hcd *xhci, struct xhci_ring
*ring)
kfree(ring);
}
-static void xhci_initialize_ring_info(struct xhci_ring *ring,
- unsigned int cycle_state)
+static void xhci_initialize_ring_info(struct xhci_ring *ring)
{
/* The ring is empty, so the enqueue pointer == dequeue pointer */
ring->enqueue = ring->first_seg->trbs;
@@ -173,10 +172,9 @@ static void xhci_initialize_ring_info(struct xhci_ring
*ring,
* bit to handover ownership of the TRB, so PCS = 1. The consumer must
* compare CCS to the cycle bit to check ownership, so CCS = 1.
*
- * New rings are initialized with cycle state equal to 1; if we are
- * handling ring expansion, set the cycle state equal to the old ring.
+ * New rings are initialized with cycle state equal to 1.
*/
- ring->cycle_state = cycle_state;
+ ring->cycle_state = TRB_CYCLE;
/* Not necessary for new rings, but needed for re-initialized rings */
ring->enq_updates = 0;
ring->deq_updates = 0;
@@ -234,8 +232,7 @@ static int xhci_alloc_segments_for_ring(struct xhci_hcd
*xhci,
* See section 4.9.1 and figures 15 and 16.
*/
static struct xhci_ring *xhci_ring_alloc(struct xhci_hcd *xhci,
- unsigned int num_segs, unsigned int cycle_state,
- enum xhci_ring_type type, gfp_t flags)
+ unsigned int num_segs, enum xhci_ring_type type, gfp_t flags)
{
struct xhci_ring *ring;
int ret;
@@ -251,7 +248,7 @@ static struct xhci_ring *xhci_ring_alloc(struct xhci_hcd
*xhci,
return ring;
ret = xhci_alloc_segments_for_ring(xhci, &ring->first_seg,
- &ring->last_seg, num_segs, cycle_state, type, flags);
+ &ring->last_seg, num_segs, TRB_CYCLE, type, flags);
if (ret)
goto fail;
@@ -261,7 +258,7 @@ static struct xhci_ring *xhci_ring_alloc(struct xhci_hcd
*xhci,
ring->last_seg->trbs[TRBS_PER_SEGMENT - 1].link.control |=
cpu_to_le32(LINK_TOGGLE);
}
- xhci_initialize_ring_info(ring, cycle_state);
+ xhci_initialize_ring_info(ring);
return ring;
fail:
@@ -297,25 +294,19 @@ void xhci_free_or_cache_endpoint_ring(struct xhci_hcd
*xhci,
* pointers to the beginning of the ring.
*/
static void xhci_reinit_cached_ring(struct xhci_hcd *xhci,
- struct xhci_ring *ring, unsigned int cycle_state,
- enum xhci_ring_type type)
+ struct xhci_ring *ring, enum xhci_ring_type type)
{
struct xhci_segment *seg = ring->first_seg;
- int i;
do {
memset(seg->trbs, 0,
sizeof(union xhci_trb)*TRBS_PER_SEGMENT);
- if (cycle_state == 0) {
- for (i = 0; i < TRBS_PER_SEGMENT; i++)
- seg->trbs[i].link.control |= TRB_CYCLE;
- }
/* All endpoint rings have link TRBs */
xhci_link_segments(xhci, seg, seg->next, type);
seg = seg->next;
} while (seg != ring->first_seg);
ring->type = type;
- xhci_initialize_ring_info(ring, cycle_state);
+ xhci_initialize_ring_info(ring);
/* td list should be empty since all URBs have been cancelled,
* but just in case...
*/
@@ -597,7 +588,7 @@ struct xhci_stream_info *xhci_alloc_stream_info(struct
xhci_hcd *xhci,
*/
for (cur_stream = 1; cur_stream < num_streams; cur_stream++) {
stream_info->stream_rings[cur_stream] =
- xhci_ring_alloc(xhci, 2, 1, TYPE_STREAM, mem_flags);
+ xhci_ring_alloc(xhci, 2, TYPE_STREAM, mem_flags);
cur_ring = stream_info->stream_rings[cur_stream];
if (!cur_ring)
goto cleanup_rings;
@@ -906,7 +897,7 @@ int xhci_alloc_virt_device(struct xhci_hcd *xhci, int
slot_id,
}
/* Allocate endpoint 0 ring */
- dev->eps[0].ring = xhci_ring_alloc(xhci, 2, 1, TYPE_CTRL, flags);
+ dev->eps[0].ring = xhci_ring_alloc(xhci, 2, TYPE_CTRL, flags);
if (!dev->eps[0].ring)
goto fail;
@@ -1326,7 +1317,7 @@ int xhci_endpoint_init(struct xhci_hcd *xhci,
type = usb_endpoint_type(&ep->desc);
/* Set up the endpoint ring */
virt_dev->eps[ep_index].new_ring =
- xhci_ring_alloc(xhci, 2, 1, type, mem_flags);
+ xhci_ring_alloc(xhci, 2, type, mem_flags);
if (!virt_dev->eps[ep_index].new_ring) {
/* Attempt to use the ring cache */
if (virt_dev->num_rings_cached == 0)
@@ -1336,7 +1327,7 @@ int xhci_endpoint_init(struct xhci_hcd *xhci,
virt_dev->ring_cache[virt_dev->num_rings_cached] = NULL;
virt_dev->num_rings_cached--;
xhci_reinit_cached_ring(xhci, virt_dev->eps[ep_index].new_ring,
- 1, type);
+ type);
}
virt_dev->eps[ep_index].skip = false;
ep_ring = virt_dev->eps[ep_index].new_ring;
@@ -2303,7 +2294,7 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
goto fail;
/* Set up the command ring to have one segments for now. */
- xhci->cmd_ring = xhci_ring_alloc(xhci, 1, 1, TYPE_COMMAND, flags);
+ xhci->cmd_ring = xhci_ring_alloc(xhci, 1, TYPE_COMMAND, flags);
if (!xhci->cmd_ring)
goto fail;
xhci_dbg_trace(xhci, trace_xhci_dbg_init,
@@ -2347,7 +2338,7 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
* the event ring segment table (ERST). Section 4.9.3.
*/
xhci_dbg_trace(xhci, trace_xhci_dbg_init, "// Allocating event ring");
- xhci->event_ring = xhci_ring_alloc(xhci, ERST_NUM_SEGS, 1, TYPE_EVENT,
+ xhci->event_ring = xhci_ring_alloc(xhci, ERST_NUM_SEGS, TYPE_EVENT,
flags);
if (!xhci->event_ring)
goto fail;
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 53c2e29..045de10 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -178,7 +178,7 @@ static void inc_deq(struct xhci_hcd *xhci, struct xhci_ring
*ring)
if (ring->type == TYPE_EVENT &&
last_trb_on_last_seg(xhci, ring,
ring->deq_seg, ring->dequeue)) {
- ring->cycle_state ^= 1;
+ ring->cycle_state ^= TRB_CYCLE;
}
ring->deq_seg = ring->deq_seg->next;
ring->dequeue = ring->deq_seg->trbs;
@@ -257,7 +257,7 @@ static void inc_enq(struct xhci_hcd *xhci, struct xhci_ring
*ring,
/* Toggle the cycle bit after the last ring segment. */
if (last_trb_on_last_seg(xhci, ring, ring->enq_seg,
next)) {
- ring->cycle_state = (ring->cycle_state ? 0 : 1);
+ ring->cycle_state ^= TRB_CYCLE;
}
}
ring->enq_seg = ring->enq_seg->next;
@@ -475,7 +475,7 @@ static struct xhci_segment *find_trb_seg(
&cur_seg->trbs[TRBS_PER_SEGMENT - 1] < trb) {
generic_trb = &cur_seg->trbs[TRBS_PER_SEGMENT - 1].generic;
if (generic_trb->field[3] & cpu_to_le32(LINK_TOGGLE))
- *cycle_state ^= 0x1;
+ *cycle_state ^= TRB_CYCLE;
cur_seg = cur_seg->next;
if (cur_seg == start_seg)
/* Looped over the entire list. Oops! */
@@ -580,7 +580,7 @@ void xhci_find_new_dequeue_state(struct xhci_hcd *xhci,
xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
"Finding endpoint context");
ep_ctx = xhci_get_ep_ctx(xhci, dev->out_ctx, ep_index);
- state->new_cycle_state = 0x1 & le64_to_cpu(ep_ctx->deq);
+ state->new_cycle_state = TRB_CYCLE & le64_to_cpu(ep_ctx->deq);
state->new_deq_ptr = cur_td->last_trb;
xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
@@ -596,7 +596,7 @@ void xhci_find_new_dequeue_state(struct xhci_hcd *xhci,
trb = &state->new_deq_ptr->generic;
if (TRB_TYPE_LINK_LE32(trb->field[3]) &&
(trb->field[3] & cpu_to_le32(LINK_TOGGLE)))
- state->new_cycle_state ^= 0x1;
+ state->new_cycle_state ^= TRB_CYCLE;
next_trb(xhci, ep_ring, &state->new_deq_seg, &state->new_deq_ptr);
/*
@@ -610,7 +610,7 @@ void xhci_find_new_dequeue_state(struct xhci_hcd *xhci,
*/
if (ep_ring->first_seg == ep_ring->first_seg->next &&
state->new_deq_ptr < dev->eps[ep_index].stopped_trb)
- state->new_cycle_state ^= 0x1;
+ state->new_cycle_state ^= TRB_CYCLE;
xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
"Cycle state = 0x%x", state->new_cycle_state);
@@ -3063,7 +3063,7 @@ static int prepare_ring(struct xhci_hcd *xhci, struct
xhci_ring *ep_ring,
/* Toggle the cycle bit after the last ring segment. */
if (last_trb_on_last_seg(xhci, ring, ring->enq_seg,
next)) {
- ring->cycle_state = (ring->cycle_state ? 0 : 1);
+ ring->cycle_state ^= TRB_CYCLE;
}
ring->enq_seg = ring->enq_seg->next;
ring->enqueue = ring->enq_seg->trbs;
@@ -3351,7 +3351,7 @@ static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t
mem_flags,
if (first_trb) {
first_trb = false;
if (start_cycle == 0)
- field |= 0x1;
+ field |= TRB_CYCLE;
} else
field |= ep_ring->cycle_state;
@@ -3514,7 +3514,7 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t
mem_flags,
if (first_trb) {
first_trb = false;
if (start_cycle == 0)
- field |= 0x1;
+ field |= TRB_CYCLE;
} else
field |= ep_ring->cycle_state;
@@ -3629,7 +3629,7 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t
mem_flags,
field = 0;
field |= TRB_IDT | TRB_TYPE(TRB_SETUP);
if (start_cycle == 0)
- field |= 0x1;
+ field |= TRB_CYCLE;
/* xHCI 1.0 6.4.1.2.1: Transfer Type field */
if (xhci->hci_version == 0x100) {
@@ -3839,7 +3839,7 @@ static int xhci_queue_isoc_tx(struct xhci_hcd *xhci,
gfp_t mem_flags,
field |= TRB_SIA;
if (i == 0) {
if (start_cycle == 0)
- field |= 0x1;
+ field |= TRB_CYCLE;
} else
field |= ep_ring->cycle_state;
first_trb = false;
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 4265b48..7550cb1 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -825,7 +825,7 @@ static void xhci_clear_command_ring(struct xhci_hcd *xhci)
* Ring is now zeroed, so the HW should look for change of ownership
* when the cycle bit is set to 1.
*/
- ring->cycle_state = 1;
+ ring->cycle_state = TRB_CYCLE;
/*
* Reset the hardware dequeue pointer.
--
1.8.1.2
--
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