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drm/i915: disable rc6 on ilk when vt-d is enabled

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It blows up. And hopefully this is the root-cause of the mysterious
rc6 related hang on ilk. For reference, the commit that enabled rc6 on
ilk again is:

commit 456470eb58
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Wed Aug 8 23:35:40 2012 +0200

    drm/i915: enable rc6 on ilk again

Reported-by: Dave Airlie <airlied@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2012-08-26 20:33:18 +02:00
parent 7788a76520
commit cd7988eea5
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/i915/intel_pm.c
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@ -2372,6 +2372,11 @@ int intel_enable_rc6(const struct drm_device *dev)
return i915_enable_rc6;
if (INTEL_INFO(dev)->gen == 5) {
#ifdef CONFIG_INTEL_IOMMU
/* Disable rc6 on ilk if VT-d is on. */
if (intel_iommu_gfx_mapped)
return false;
#endif
DRM_DEBUG_DRIVER("Ironlake: only RC6 available\n");
return INTEL_RC6_ENABLE;
}