[PATCH] drm/atomic-helper: Calculate normalized zpos values

[Thierry Reding]

From: Thierry Reding <treding at nvidia.com>

kerneldoc for drm_plane_create_zpos_property() says that the DRM core
will automatically calculate the normalized zpos values, but it won't
currently do so. Modify the atomic helpers to behave as documented.

Signed-off-by: Thierry Reding <treding at nvidia.com>
---
 drivers/gpu/drm/drm_atomic_helper.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 71d712f1b56a..6c3ceb3a5dc0 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -791,6 +791,10 @@ int drm_atomic_helper_check(struct drm_device *dev,
 	if (ret)
 		return ret;
 
+	ret = drm_atomic_normalize_zpos(dev, state);
+	if (ret)
+		return ret;
+
 	ret = drm_atomic_helper_check_planes(dev, state);
 	if (ret)
 		return ret;
-- 
2.14.1