From: Andiry Xu <andiry.xu@amd.com>
Date: Mon, 5 Mar 2012 09:49:34 +0000 (+0800)
Subject: xHCI: count free TRBs on transfer ring
X-Git-Tag: v3.4-rc1~184^2~21^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b008df60c6369ba0290fa7daa177375407a12e07;p=pandora-kernel.git

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>
---

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