drm: xlnx: zynqmp_dpsub: Add global alpha support

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

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

diff --git a/drivers/gpu/drm/xlnx/zynqmp_disp.c b/drivers/gpu/drm/xlnx/zynqmp_disp.c
index 27b3829..d87af7c 100644 (file)
--- a/drivers/gpu/drm/xlnx/zynqmp_disp.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_disp.c
@@ -1164,7 +1164,8 @@ zynqmp_disp_plane_atomic_disable(struct drm_plane *plane,
        zynqmp_disp_layer_disable(layer);
 
        if (zynqmp_disp_layer_is_gfx(layer))
-               zynqmp_disp_blend_set_global_alpha(layer->disp, false, 0);
+               zynqmp_disp_blend_set_global_alpha(layer->disp, false,
+                                                  plane->state->alpha >> 8);
 }
 
 static void
@@ -1195,7 +1196,8 @@ zynqmp_disp_plane_atomic_update(struct drm_plane *plane,
        zynqmp_disp_layer_update(layer, new_state);
 
        if (zynqmp_disp_layer_is_gfx(layer))
-               zynqmp_disp_blend_set_global_alpha(layer->disp, true, 255);
+               zynqmp_disp_blend_set_global_alpha(layer->disp, true,
+                                                  plane->state->alpha >> 8);
 
        /* Enable or re-enable the plane is the format has changed. */
        if (format_changed)
@@ -1249,6 +1251,9 @@ static int zynqmp_disp_create_planes(struct zynqmp_disp *disp)
 
                drm_plane_helper_add(&layer->plane,
                                     &zynqmp_disp_plane_helper_funcs);
+
+               if (zynqmp_disp_layer_is_gfx(layer))
+                       drm_plane_create_alpha_property(&layer->plane);
        }
 
        return 0;