From c3613de92ebea302137d21d8938421c3f88d8741 Mon Sep 17 00:00:00 2001
From: Keith Packard <keithp@keithp.com>
Date: Fri, 12 Aug 2011 17:05:54 -0700
Subject: [PATCH] drm/i915: Can't do accurate vblank timestamps with UMS

Disable this feature when KMS is not running by setting the
driver->get_vblank_timestamp function pointer to NULL.

Signed-off-by: Keith Packard <keithp@keithp.com>
Tested-by: Justin P. Mattock <justinmattock@gmail.com>
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