drm: drop mtrr from i915

Alan Hourihane wants to set MTRR in the DDX only as otherwise
we get problems with the shared memory chipset.

From: Alan Hourihane <alanh@fairlite.demon.co.uk>
Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/char/drm/i915_drv.c b/drivers/char/drm/i915_drv.c
index 32b7f8bb420d..e88d32d286f5 100644
--- a/drivers/char/drm/i915_drv.c
+++ b/drivers/char/drm/i915_drv.c
@@ -39,8 +39,11 @@ static struct pci_device_id pciidlist[] = {
 };
 
 static struct drm_driver driver = {
+        /* don't use mtrr's here, the Xserver or user space app should
+         * deal with them for intel hardware.
+         */
         .driver_features =
-            DRIVER_USE_AGP | DRIVER_REQUIRE_AGP | DRIVER_USE_MTRR |
+            DRIVER_USE_AGP | DRIVER_REQUIRE_AGP | /* DRIVER_USE_MTRR |*/
             DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED,
         .load = i915_driver_load,
         .lastclose = i915_driver_lastclose,