From: Ben Widawsky <ben@bwidawsk.net>
Date: Sun, 20 Mar 2011 01:14:27 +0000 (-0700)
Subject: drm/1915: ringbuffer wait for idle function
X-Git-Tag: v3.0-rc1~312^2~4^2~35
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=96f298aa9c9fc9b7c8a2ebaf8c195d178f570e09;p=pandora-kernel.git

drm/1915: ringbuffer wait for idle function

Added a new function which waits for the ringbuffer space to be equal to
(total - 8). This is the empty condition of the ringbuffer, and
equivalent to head==tail.

Also modified two users of this functionality elsewhere in the code.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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