From 26507b065b503ac1b5ba702161c2084190fc0c9f Mon Sep 17 00:00:00 2001
From: =?utf8?q?St=C3=A9phane=20Marchesin?= <marcheu@chromium.org>
Date: Wed, 2 Jul 2014 15:13:42 -0700
Subject: [PATCH] drm/udl: add vblank support
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This is needed to be able to send page flip completion events.
Also while I'm at it, fix the error paths on init.

Signed-off-by: Stéphane Marchesin <marcheu@chromium.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
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