i915: Avoid calling drm_fence_flush_old excessively.

diff --git a/shared-core/i915_dma.c b/shared-core/i915_dma.c
index 15fb811..a012f68 100644 (file)
--- a/shared-core/i915_dma.c
+++ b/shared-core/i915_dma.c
@@ -494,7 +494,8 @@ static int i915_dispatch_cmdbuffer(struct drm_device * dev,
 
        i915_emit_breadcrumb(dev);
 #ifdef I915_HAVE_FENCE
-       drm_fence_flush_old(dev, 0, dev_priv->counter);
+       if (unlikely((dev_priv->counter & 0xFF) == 0))
+               drm_fence_flush_old(dev, 0, dev_priv->counter);
 #endif
        return 0;
 }
@@ -548,7 +549,8 @@ static int i915_dispatch_batchbuffer(struct drm_device * dev,
 
        i915_emit_breadcrumb(dev);
 #ifdef I915_HAVE_FENCE
-       drm_fence_flush_old(dev, 0, dev_priv->counter);
+       if (unlikely((dev_priv->counter & 0xFF) == 0))
+               drm_fence_flush_old(dev, 0, dev_priv->counter);
 #endif
        return 0;
 }
@@ -621,7 +623,7 @@ void i915_dispatch_flip(struct drm_device * dev, int planes, int sync)
 
        i915_emit_breadcrumb(dev);
 #ifdef I915_HAVE_FENCE
-       if (!sync)
+       if (unlikely(!sync && ((dev_priv->counter & 0xFF) == 0)))
                drm_fence_flush_old(dev, 0, dev_priv->counter);
 #endif
 }