[Intel-gfx] [PATCH] drm/i915: Skip fence installation for objects with rotated views (v4)

[Vivek Kasireddy]

While pinning a fb object to the display plane, only install a fence
if the object is using a normal view. This corresponds with the
behavior found in i915_gem_object_do_pin() where the fencability
criteria is determined only for objects with normal views.

v2:
Look at the object's map_and_fenceable flag to determine whether to
install a fence or not (Chris).

v3:
Pin and unpin a fence only if the current view type is normal.

v4:
Extend the "view type is normal" check for pin_fence as well.

Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Ville Syrjala <ville.syrjala at linux.intel.com>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy at intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 36 ++++++++++++++++++++----------------
 1 file changed, 20 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 2fdfca1..9c80968 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2419,22 +2419,24 @@ intel_pin_and_fence_fb_obj(struct drm_plane *plane,
 	 * framebuffer compression.  For simplicity, we always install
 	 * a fence as the cost is not that onerous.
 	 */
-	ret = i915_gem_object_get_fence(obj);
-	if (ret == -EDEADLK) {
-		/*
-		 * -EDEADLK means there are no free fences
-		 * no pending flips.
-		 *
-		 * This is propagated to atomic, but it uses
-		 * -EDEADLK to force a locking recovery, so
-		 * change the returned error to -EBUSY.
-		 */
-		ret = -EBUSY;
-		goto err_unpin;
-	} else if (ret)
-		goto err_unpin;
+	if (view.type == I915_GGTT_VIEW_NORMAL) {
+		ret = i915_gem_object_get_fence(obj);
+		if (ret == -EDEADLK) {
+			/*
+			 * -EDEADLK means there are no free fences
+			 * no pending flips.
+			 *
+			 * This is propagated to atomic, but it uses
+			 * -EDEADLK to force a locking recovery, so
+			 * change the returned error to -EBUSY.
+			 */
+			ret = -EBUSY;
+			goto err_unpin;
+		} else if (ret)
+			goto err_unpin;
 
-	i915_gem_object_pin_fence(obj);
+		i915_gem_object_pin_fence(obj);
+	}
 
 	dev_priv->mm.interruptible = true;
 	intel_runtime_pm_put(dev_priv);
@@ -2460,7 +2462,9 @@ static void intel_unpin_fb_obj(struct drm_framebuffer *fb,
 	ret = intel_fill_fb_ggtt_view(&view, fb, plane_state);
 	WARN_ONCE(ret, "Couldn't get view from plane state!");
 
-	i915_gem_object_unpin_fence(obj);
+	if (view.type == I915_GGTT_VIEW_NORMAL)
+		i915_gem_object_unpin_fence(obj);
+
 	i915_gem_object_unpin_from_display_plane(obj, &view);
 }
 
-- 
2.4.3