drm/i915: Disable semaphores by default on SNB
Semaphores still cause problems on some machines: > From Udo Steinberg: > > With Linux-3.2-rc6 I'm frequently seeing GPU hangs when large amounts of > text scroll in an xterm, such as when extracting a tar archive. Such as this > one (note the timestamps): > > I can reproduce it fairly easily with something > as simple as: > > while true; do dmesg; done This patch turns them off on SNB while leaving them on for IVB. Reported-by: Udo Steinberg <udo@hypervisor.org> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: Eugeni Dodonov <eugeni@dodonov.net> Signed-off-by: Keith Packard <keithp@keithp.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -756,9 +756,9 @@ intel_enable_semaphores(struct drm_device *dev)
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if (i915_semaphores >= 0)
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return i915_semaphores;
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/* Enable semaphores on SNB when IO remapping is off */
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/* Disable semaphores on SNB */
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if (INTEL_INFO(dev)->gen == 6)
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return !intel_iommu_enabled;
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return 0;
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return 1;
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}
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