From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Sat, 7 Aug 2010 10:01:35 +0000 (+0100)
Subject: drm/i915: Ensure that while(INREG()) are bounded (v2)
X-Git-Tag: v2.6.36-rc2~2^2~21
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=913d8d110078788c14812dce8bb62c37946821d2;p=pandora-kernel.git

drm/i915: Ensure that while(INREG()) are bounded (v2)

Add a new macro, wait_for, to simplify the act of waiting on a register
to change state. wait_for() takes three arguments, the condition to
inspect on every loop, the maximum amount of time to wait and whether to
yield the cpu for a length of time after each check.

v2: Upgrade failure messages to DRM_ERROR on the suggestion of
Eric Anholt. We do not expect to hit these conditions as they reflect
programming errors, so if we do we want to be notified.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Eric Anholt <eric@anholt.net>
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