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USB: xHCI: allocate bigger ring for isochronous endpoint

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Isochronous endpoint needs a bigger size of transfer ring. Isochronous URB
consists of multiple packets, each packet needs a isoc td to carry, and
there will be multiple trbs inserted to the ring at one time. One segment
is too small for isochronous endpoints, and it will result in
room_on_ring() check failure and the URB is failed to enqueue.

Allocate bigger ring for isochronous endpoint. 8 segments should be enough.
This will be replaced with dynamic ring expansion in the future.

Signed-off-by: Andiry Xu <andiry.xu@amd.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Andiry Xu 2010-07-22 15:23:47 -07:00 committed by Greg Kroah-Hartman
parent 04e51901dd
commit a061a5a0b8
1 changed files with 12 additions and 2 deletions
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10
drivers/usb/host/xhci-mem.c
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@ -1112,6 +1112,16 @@ int xhci_endpoint_init(struct xhci_hcd *xhci,
ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, ep_index);
/* Set up the endpoint ring */
/*
* Isochronous endpoint ring needs bigger size because one isoc URB
* carries multiple packets and it will insert multiple tds to the
* ring.
* This should be replaced with dynamic ring resizing in the future.
*/
if (usb_endpoint_xfer_isoc(&ep->desc))
virt_dev->eps[ep_index].new_ring =
xhci_ring_alloc(xhci, 8, true, mem_flags);
else
virt_dev->eps[ep_index].new_ring =
xhci_ring_alloc(xhci, 1, true, mem_flags);
if (!virt_dev->eps[ep_index].new_ring) {