From c062df61966405b0be6743bfb0cf300dca2fa7c2 Mon Sep 17 00:00:00 2001
From: Li Peng <peng.li@linux.intel.com>
Date: Sat, 23 Jan 2010 00:12:58 +0800
Subject: [PATCH] drm/i915: enable vblank interrupt on ironlake

so far vblank interrupt on ironlake is disabled, this would cause
bad gfx performance if userspace calls drm_wait_vblank. This patch
enables vblank interrupt on ironlake and follows vblank get/put
model.

Signed-off-by: Li Peng <peng.li@intel.com>
Acked-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
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Reading git-format-patch failed