drm/i915: Don't reserve compatibility fence regs in KMS mode.

The fence start is for compatibility with UMS X Servers before fence
management.  KMS X Servers only started doing tiling after fence
management appeared.

Signed-off-by: Eric Anholt <eric@anholt.net>

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 129ac36..4a14199 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4794,7 +4794,8 @@ i915_gem_load(struct drm_device *dev)
        spin_unlock(&shrink_list_lock);
 
        /* Old X drivers will take 0-2 for front, back, depth buffers */
-       dev_priv->fence_reg_start = 3;
+       if (!drm_core_check_feature(dev, DRIVER_MODESET))
+               dev_priv->fence_reg_start = 3;
 
        if (IS_I965G(dev) || IS_I945G(dev) || IS_I945GM(dev) || IS_G33(dev))
                dev_priv->num_fence_regs = 16;