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| author | Andiry Xu <andiry.xu@amd.com> | 2012-03-05 17:49:34 +0800 |
|---|---|---|
| committer | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2012-03-13 09:29:55 -0700 |
| commit | b008df60c6369ba0290fa7daa177375407a12e07 (patch) | |
| tree | 05a59c4a4d8d624b18ad0844949841f36b241c17 /drivers/usb/host/xhci.h | |
| parent | 3fe4fe083d3355537565b2b0a678807513dfa013 (diff) | |
| download | linux-b008df60c6369ba0290fa7daa177375407a12e07.tar.gz linux-b008df60c6369ba0290fa7daa177375407a12e07.tar.bz2 linux-b008df60c6369ba0290fa7daa177375407a12e07.zip | |
xHCI: count free TRBs on transfer ring
In the past, the room_on_ring() check was implemented by walking all over
the ring, which is wasteful and complicated.
Count the number of free TRBs instead. The free TRBs number should be
updated when enqueue/dequeue pointer is updated, or upon the completion
of a set dequeue pointer command.
Signed-off-by: Andiry Xu <andiry.xu@amd.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Tested-by: Paul Zimmerman <Paul.Zimmerman@synopsys.com>
Diffstat (limited to 'drivers/usb/host/xhci.h')
| -rw-r--r-- | drivers/usb/host/xhci.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 2337a8e80b60..ea8fc237d158 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1278,6 +1278,8 @@ struct xhci_ring { u32 cycle_state; unsigned int stream_id; unsigned int num_segs; + unsigned int num_trbs_free; + unsigned int num_trbs_free_temp; enum xhci_ring_type type; bool last_td_was_short; }; |