The 2D driver unfortunately uses the BLT ring in order to perform blits,
and will often blit between buffers in the course of a pageflip. (Though
usually it is from the post-flipped scanout to the window frontbuffer
for reasons known only to itself, maintaining the front buffer in case
of 2D access one presumes.)
As such, being able to use a GPU semaphore and not stall the CPU/GPU
whilst switching between rings for a pageflip is useful.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_gem.c | 8 +++-----
1 files changed, 3 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 801496a..fe45f4e 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3217,11 +3217,9 @@ i915_gem_object_pin_to_display_plane(struct
drm_i915_gem_object *obj,
if (ret)
return ret;
- if (pipelined != obj->ring) {
- ret = i915_gem_object_wait_rendering(obj);
- if (ret)
- return ret;
- }
+ ret = i915_gem_object_move_to_ring(obj, pipelined);
+ if (ret)
+ return ret;
/* The display engine is not coherent with the LLC cache on gen6. As
* a result, we make sure that the pinning that is about to occur is
--
1.7.4.1
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