From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Tue, 15 Sep 2009 20:57:32 +0000 (+0200)
Subject: drm/i915: add i915_lp_ring_sync helper
X-Git-Tag: v2.6.33-rc1~323^2~5^2~60
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=48764bf43f746113fc77877d7e80f2df23ca4cbb;p=pandora-kernel.git

drm/i915: add i915_lp_ring_sync helper

This just waits until the hw passed the current ring position with
cmd execution. This slightly changes the existing i915_wait_request
function to make uninterruptible waiting possible - no point in
returning to userspace while mucking around with the overlay, that
piece of hw is just too fragile.

Also replace a magic 0 with the symbolic constant (and kill the then
superflous comment) while I was looking at the code.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Eric Anholt <eric@anholt.net>
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