drm/i915: Don't do MTRR setup if PAT is enabled

Some newer BIOSes are shipping with all MTRRs already populated.  These
BIOSes are all on machines with sufficiently new CPUs that the
referenced errata doesn't apply anyway, so just don't try to claim the
MTRR.

Signed-off-by: Adam Jackson <ajax@redhat.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=41648
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index fa5c276b7992aaccd897fb8618288b1e3eb6de56..ee7775c5545054a04f4be31dad1116fb289043b0 100644 (file)
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -43,6 +43,7 @@
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <acpi/video.h>
+#include <asm/pat.h>
 
 static void i915_write_hws_pga(struct drm_device *dev)
 {
@@ -1918,6 +1919,11 @@ static void
 i915_mtrr_setup(struct drm_i915_private *dev_priv, unsigned long base,
                unsigned long size)
 {
+#if defined(CONFIG_X86_PAT)
+       if (cpu_has_pat)
+               return;
+#endif
+
        /* Set up a WC MTRR for non-PAT systems.  This is more common than
         * one would think, because the kernel disables PAT on first
         * generation Core chips because WC PAT gets overridden by a UC