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Commit be71eabe authored by Rodrigo Vivi's avatar Rodrigo Vivi Committed by Daniel Vetter
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Revert "drm/i915: Enable semaphores on BDW" 



This reverts commit 521e62e4.

Although POST_SYNC brought a bit of stability to Semaphores on BDW
it didn't solved all issues and some hungs can still occour when
semaphores are enabled on BDW. Also some sloweness can be found on some
igt tests, althoguth it apparently doesn't affect real workloads.

Besides that, no real performance gain was found on our tests with different
and even multiple workloads.

Let's disable it again for now. At least until we are sure it is safe
to re-enable it.

Signed-off-by: default avatarRodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent ece4a17d

drivers/gpu/drm/i915/i915_drv.c

+4 −0
Original line number Diff line number Diff line
@@ -481,6 +481,10 @@ bool i915_semaphore_is_enabled(struct drm_device *dev) 
	if (i915.semaphores >= 0)

		return i915.semaphores;



	/* Until we get further testing... */

	if (IS_GEN8(dev))

		return false;



#ifdef CONFIG_INTEL_IOMMU

	/* Enable semaphores on SNB when IO remapping is off */

	if (INTEL_INFO(dev)->gen == 6 && intel_iommu_gfx_mapped)