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drm/i915: disable rc6 on ilk when vt-d is enabled
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:
parent
7788a76520
commit
cd7988eea5
@ -2372,6 +2372,11 @@ int intel_enable_rc6(const struct drm_device *dev)
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return i915_enable_rc6;
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if (INTEL_INFO(dev)->gen == 5) {
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#ifdef CONFIG_INTEL_IOMMU
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/* Disable rc6 on ilk if VT-d is on. */
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if (intel_iommu_gfx_mapped)
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return false;
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#endif
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DRM_DEBUG_DRIVER("Ironlake: only RC6 available\n");
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return INTEL_RC6_ENABLE;
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}
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