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usb-xhci: ready the link trb early 

The keyboard events being async, need to prepare the link when last but
one trb is queued.

Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
This commit is contained in:
Nikunj A Dadhania 2015-09-18 14:17:01 +05:30 committed by Alexey Kardashevskiy
parent 35f9876b6a
commit ec94b351f6
1 changed files with 6 additions and 7 deletions
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13
lib/libusb/usb-xhci.c
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@ -1119,18 +1119,17 @@ static inline struct xhci_seg *xhci_pipe_get_seg(struct usb_pipe *pipe)
static inline void *xhci_get_trb(struct xhci_seg *seg)
{
uint64_t val, enq;
uint32_t size;
int index;
struct xhci_link_trb *link;
enq = val = seg->enq;
val = val + XHCI_TRB_SIZE;
size = seg->size * XHCI_TRB_SIZE;
/* TRBs being a cyclic buffer, here we cycle back to beginning. */
if ((val % size) == 0) {
index = (enq - (uint64_t)seg->trbs) / XHCI_TRB_SIZE + 1;
dprintf("%s: enq %llx, val %llx %x\n", __func__, enq, val, index);
/* TRBs being a cyclic buffer, here we cycle back to beginning. */
if (index == (seg->size - 1)) {
dprintf("%s: rounding \n", __func__);
seg->enq = (uint64_t)seg->trbs;
enq = seg->enq;
seg->enq = seg->enq + XHCI_TRB_SIZE;
val = 0;
seg->cycle_state ^= seg->cycle_state;
link = (struct xhci_link_trb *) (seg->trbs + seg->size - 1);
link->addr = cpu_to_le64(seg->trbs_dma);