drm/i915: Completely disable fence pipelining.

I'm still seeing tiling corruption of PutImage and CopyArea (I think)
under mutter on pnv, so obviously the pipelining logic is deeply flawed.

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

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index eeed2e9..8685b92 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2484,6 +2484,9 @@ i915_gem_object_get_fence(struct drm_i915_gem_object *obj,
        struct drm_i915_fence_reg *reg;
        int ret;
 
+       /* XXX disable pipelining. There are bugs. Shocking. */
+       pipelined = NULL;
+
        /* Just update our place in the LRU if our fence is getting reused. */
        if (obj->fence_reg != I915_FENCE_REG_NONE) {
                reg = &dev_priv->fence_regs[obj->fence_reg];
@@ -2556,9 +2559,8 @@ i915_gem_object_get_fence(struct drm_i915_gem_object *obj,
                if (old->tiling_mode)
                        i915_gem_release_mmap(old);
 
-               /* XXX The pipelined change over appears to be incoherent. */
                ret = i915_gem_object_flush_fence(old,
-                                                 NULL, //pipelined,
+                                                 pipelined,
                                                  interruptible);
                if (ret) {
                        drm_gem_object_unreference(&old->base);