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drm/i915: Disable GPU semaphores on SandyBridge mobile

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Hopefully, this is a temporary measure whilst the root cause is
understood. At the moment, we experience a hard hang whilst looping
urbanterror that has been identified as a result of the use of
semaphores, but so far only on SNB mobile.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=32752
Tested-by: mengmeng.meng@intel.com
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2011-01-14 09:46:38 +00:00
parent 595dad76a0
commit 1591192d3a
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/i915_gem_execbuffer.c
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@ -772,7 +772,8 @@ i915_gem_execbuffer_sync_rings(struct drm_i915_gem_object *obj,
if (from == NULL || to == from)
return 0;
if (INTEL_INFO(obj->base.dev)->gen < 6)
/* XXX gpu semaphores are currently causing hard hangs on SNB mobile */
if (INTEL_INFO(obj->base.dev)->gen < 6 || IS_MOBILE(obj->base.dev))
return i915_gem_object_wait_rendering(obj, true);
idx = intel_ring_sync_index(from, to);