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authorAndiry Xu <andiry.xu@amd.com>2011-05-05 18:14:02 +0800
committerSarah Sharp <sarah.a.sharp@linux.intel.com>2011-05-09 09:34:47 -0700
commitad106f292369d753d5c75751cb9e760726e3cd00 (patch)
tree0d612a1b3a09f03103eb33a012dbb3264137e170 /drivers/usb/host/xhci-ring.c
parent7b1fc2ea8a5fbf9487d83865456cff77d0249ea9 (diff)
xHCI 1.0: Block Interrupts for Isoch transfer
Currently an isoc URB is divided into multiple TDs, and every TD will trigger an interrupt when it's processed. However, software can schedule multiple TDs at a time, and it only needs an interrupt every URB. xHCI 1.0 introduces the Block Event Interrupt(BEI) flag which allows Normal and Isoch Transfer TRBs to place an Event TRB on an Event Ring but not assert an intrrupt to the host, and the interrupt rate is significantly reduced and the system performance is improved. Signed-off-by: Andiry Xu <andiry.xu@amd.com> Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Diffstat (limited to 'drivers/usb/host/xhci-ring.c')
-rw-r--r--drivers/usb/host/xhci-ring.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 3e759af049b..c35058b94de 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -3293,6 +3293,11 @@ static int xhci_queue_isoc_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
} else {
td->last_trb = ep_ring->enqueue;
field |= TRB_IOC;
+ if (xhci->hci_version == 0x100) {
+ /* Set BEI bit except for the last td */
+ if (i < num_tds - 1)
+ field |= TRB_BEI;
+ }
more_trbs_coming = false;
}