[PATCH 3/3] drm/amd/display: Implement zpos property

[Joshua Ashton]

Despite certain GPUs supporting multiple overlay planes already in
AMDGPU, the driver did not expose the zpos property which is required
for userspace to take advantage of multiple overlay planes in any
meaningful way.

The driver was already hooked up to normalized_zpos, but was just
missing the exposure of it.

Signed-off-by: Joshua Ashton <joshua at froggi.es>

Cc: Harry Wentland <harry.wentland at amd.com>
Cc: Melissa Wen <mwen at igalia.com>
Cc: Simon Ser <contact at emersion.fr>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
index 8eeca160d434..2198df96ed6f 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
@@ -1468,6 +1468,15 @@ int amdgpu_dm_plane_init(struct amdgpu_display_manager *dm,
 		drm_plane_create_blend_mode_property(plane, blend_caps);
 	}
 
+	if (plane->type == DRM_PLANE_TYPE_PRIMARY) {
+		drm_plane_create_zpos_immutable_property(plane, 0);
+	} else if (plane->type == DRM_PLANE_TYPE_OVERLAY) {
+		unsigned int zpos = 1 + drm_plane_index(plane);
+		drm_plane_create_zpos_property(plane, zpos, 1, 254);
+	} else if (plane->type == DRM_PLANE_TYPE_CURSOR) {
+		drm_plane_create_zpos_immutable_property(plane, 255);
+	}
+
 	if (plane->type == DRM_PLANE_TYPE_PRIMARY &&
 	    plane_cap &&
 	    (plane_cap->pixel_format_support.nv12 ||
-- 
2.41.0