drm/omap: Add 'alpha' and 'pixel blend mode' plane properties

Add the following properties for planes:
* alpha
* pixel blend mode. Only "Pre-multiplied" and "Coverage" are supported

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190711135219.23402-1-jjhiblot@ti.com

diff --git a/drivers/gpu/drm/omapdrm/omap_plane.c b/drivers/gpu/drm/omapdrm/omap_plane.c
index 84e1be9..73ec998 100644 (file)
--- a/drivers/gpu/drm/omapdrm/omap_plane.c
+++ b/drivers/gpu/drm/omapdrm/omap_plane.c
@@ -53,8 +53,12 @@ static void omap_plane_atomic_update(struct drm_plane *plane,
        memset(&info, 0, sizeof(info));
        info.rotation_type = OMAP_DSS_ROT_NONE;
        info.rotation = DRM_MODE_ROTATE_0;
-       info.global_alpha = 0xff;
+       info.global_alpha = state->alpha >> 8;
        info.zorder = state->normalized_zpos;
+       if (state->pixel_blend_mode == DRM_MODE_BLEND_PREMULTI)
+               info.pre_mult_alpha = 1;
+       else
+               info.pre_mult_alpha = 0;
 
        /* update scanout: */
        omap_framebuffer_update_scanout(state->fb, state, &info);
@@ -285,6 +289,9 @@ struct drm_plane *omap_plane_init(struct drm_device *dev,
 
        omap_plane_install_properties(plane, &plane->base);
        drm_plane_create_zpos_property(plane, 0, 0, num_planes - 1);
+       drm_plane_create_alpha_property(plane);
+       drm_plane_create_blend_mode_property(plane, BIT(DRM_MODE_BLEND_PREMULTI) |
+                                            BIT(DRM_MODE_BLEND_COVERAGE));
 
        return plane;