drm/i915: Re-enable GPU semaphores for SandyBridge mobile

This seems to be running stably on my test laptop, so hopefully the
reported hangs where just symptoms of other bugs.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 1c3b76a..d461ad5 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -744,8 +744,7 @@ i915_gem_execbuffer_sync_rings(struct drm_i915_gem_object *obj,
        if (from == NULL || to == from)
                return 0;
 
-       /* XXX gpu semaphores are currently causing hard hangs on SNB mobile */
-       if (INTEL_INFO(obj->base.dev)->gen < 6 || IS_MOBILE(obj->base.dev))
+       if (INTEL_INFO(obj->base.dev)->gen < 6)
                return i915_gem_object_wait_rendering(obj);
 
        idx = intel_ring_sync_index(from, to);