From 4efe070896e1f7373c98a13713e659d1f5dee52a Mon Sep 17 00:00:00 2001
From: Jesse Barnes <jbarnes@virtuousgeek.org>
Date: Tue, 18 Jan 2011 11:25:41 -0800
Subject: [PATCH] drm/i915: make the blitter report buffer modifications to the
 FBC unit

Without this change, blits to the front buffer won't invalidate FBC
state, causing us to scan out stale data.  Make sure we update these
bits on every FBC enable, since they may get clobbered if we shut off
the display.

References: https://bugzilla.kernel.org/show_bug.cgi?id=26932
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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