The top (graphics) plane has a global alpha setting. Expose it through
the plane's alpha property.

Signed-off-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
---
 drivers/gpu/drm/xlnx/zynqmp_disp.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/xlnx/zynqmp_disp.c 
b/drivers/gpu/drm/xlnx/zynqmp_disp.c
index 4c23ffc75343..991dd6bebdc7 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_disp.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_disp.c
@@ -1173,7 +1173,7 @@ zynqmp_disp_plane_atomic_disable(struct drm_plane *plane,
 
        if (layer->id == ZYNQMP_DISP_LAYER_GFX)
                zynqmp_disp_blend_set_global_alpha(&layer->disp->blend, false,
-                                                  0);
+                                                  plane->state->alpha >> 8);
 }
 
 static void
@@ -1203,7 +1203,7 @@ zynqmp_disp_plane_atomic_update(struct drm_plane *plane,
 
        if (layer->id == ZYNQMP_DISP_LAYER_GFX)
                zynqmp_disp_blend_set_global_alpha(&layer->disp->blend, true,
-                                                  255);
+                                                  plane->state->alpha >> 8);
 
        /* Enable or re-enable the plane is the format has changed. */
        if (format_changed)
@@ -1262,6 +1262,8 @@ static int zynqmp_disp_create_planes(struct zynqmp_disp 
*disp)
                                     &zynqmp_disp_plane_helper_funcs);
 
                drm_plane_create_zpos_immutable_property(&layer->plane, i);
+               if (type == DRM_PLANE_TYPE_OVERLAY)
+                       drm_plane_create_alpha_property(&layer->plane);
        }
 
        return 0;
-- 
Regards,

Laurent Pinchart

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