[Intel-gfx] [PATCH 03/11] drm/i915: Avoid nesting of domain changes when setting display plane

[Chris Wilson]

Nesting domain changes will cause confusion when trying to interpret the
tracepoints describing the sequence of changes for the object, as well
as obscuring the order of operations for the reader of the code.

Signed-off-by: Chris Wilson <chris at 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 bf70355..1c65f0b 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2914,18 +2914,16 @@ i915_gem_object_set_to_display_plane(struct drm_gem_object *obj)
 			return ret;
 	}
 
+	i915_gem_object_flush_cpu_write_domain(obj);
+
 	old_write_domain = obj->write_domain;
 	old_read_domains = obj->read_domains;
 
-	obj->read_domains &= I915_GEM_DOMAIN_GTT;
-
-	i915_gem_object_flush_cpu_write_domain(obj);
-
 	/* It should now be out of any other write domains, and we can update
 	 * the domain values for our changes.
 	 */
 	BUG_ON((obj->write_domain & ~I915_GEM_DOMAIN_GTT) != 0);
-	obj->read_domains |= I915_GEM_DOMAIN_GTT;
+	obj->read_domains = I915_GEM_DOMAIN_GTT;
 	obj->write_domain = I915_GEM_DOMAIN_GTT;
 	obj_priv->dirty = 1;
 
-- 
1.7.1