[PATCH 4/5] drm: omapdrm: Store the Z order in the plane state zpos field

[Laurent Pinchart]

The DRM core implements a standard "zpos" property to control planes
ordering. The omapdrm driver implements a similar property named
"zorder". Although we can't switch to DRM core handling of the "zpos"
property for backward compatibility reasons, we can store the zorder
value in the drm_plane_state zpos field, saving us from having to
implement custom plane state handling.

Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
---
 drivers/gpu/drm/omapdrm/omap_plane.c | 73 +++++-------------------------------
 1 file changed, 10 insertions(+), 63 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/omap_plane.c b/drivers/gpu/drm/omapdrm/omap_plane.c
index 386d90af70f7..518cd0e69396 100644
--- a/drivers/gpu/drm/omapdrm/omap_plane.c
+++ b/drivers/gpu/drm/omapdrm/omap_plane.c
@@ -45,18 +45,6 @@ struct omap_plane {
 	uint32_t formats[32];
 };
 
-struct omap_plane_state {
-	struct drm_plane_state base;
-
-	unsigned int zorder;
-};
-
-static inline struct omap_plane_state *
-to_omap_plane_state(struct drm_plane_state *state)
-{
-	return container_of(state, struct omap_plane_state, base);
-}
-
 static int omap_plane_prepare_fb(struct drm_plane *plane,
 				 struct drm_plane_state *new_state)
 {
@@ -78,7 +66,6 @@ static void omap_plane_atomic_update(struct drm_plane *plane,
 {
 	struct omap_plane *omap_plane = to_omap_plane(plane);
 	struct drm_plane_state *state = plane->state;
-	struct omap_plane_state *omap_state = to_omap_plane_state(state);
 	struct omap_overlay_info info;
 	struct omap_drm_window win;
 	int ret;
@@ -90,7 +77,7 @@ static void omap_plane_atomic_update(struct drm_plane *plane,
 	info.rotation = OMAP_DSS_ROT_0;
 	info.global_alpha = 0xff;
 	info.mirror = 0;
-	info.zorder = omap_state->zorder;
+	info.zorder = state->zpos;
 
 	memset(&win, 0, sizeof(win));
 	win.rotation = state->rotation;
@@ -142,11 +129,10 @@ static void omap_plane_atomic_update(struct drm_plane *plane,
 static void omap_plane_atomic_disable(struct drm_plane *plane,
 				      struct drm_plane_state *old_state)
 {
-	struct omap_plane_state *omap_state = to_omap_plane_state(plane->state);
 	struct omap_plane *omap_plane = to_omap_plane(plane);
 
 	plane->state->rotation = DRM_ROTATE_0;
-	omap_state->zorder = plane->type == DRM_PLANE_TYPE_PRIMARY
+	plane->state->zpos = plane->type == DRM_PLANE_TYPE_PRIMARY
 			   ? 0 : omap_plane->id;
 
 	dispc_ovl_enable(omap_plane->id, false);
@@ -231,56 +217,20 @@ void omap_plane_install_properties(struct drm_plane *plane,
 	drm_object_attach_property(obj, priv->zorder_prop, 0);
 }
 
-static struct drm_plane_state *
-omap_plane_atomic_duplicate_state(struct drm_plane *plane)
-{
-	struct omap_plane_state *state;
-	struct omap_plane_state *copy;
-
-	if (WARN_ON(!plane->state))
-		return NULL;
-
-	state = to_omap_plane_state(plane->state);
-	copy = kmemdup(state, sizeof(*state), GFP_KERNEL);
-	if (copy == NULL)
-		return NULL;
-
-	__drm_atomic_helper_plane_duplicate_state(plane, &copy->base);
-
-	return &copy->base;
-}
-
-static void omap_plane_atomic_destroy_state(struct drm_plane *plane,
-					    struct drm_plane_state *state)
-{
-	__drm_atomic_helper_plane_destroy_state(state);
-	kfree(to_omap_plane_state(state));
-}
-
 static void omap_plane_reset(struct drm_plane *plane)
 {
 	struct omap_plane *omap_plane = to_omap_plane(plane);
-	struct omap_plane_state *omap_state;
-
-	if (plane->state) {
-		omap_plane_atomic_destroy_state(plane, plane->state);
-		plane->state = NULL;
-	}
 
-	omap_state = kzalloc(sizeof(*omap_state), GFP_KERNEL);
-	if (omap_state == NULL)
+	drm_atomic_helper_plane_reset(plane);
+	if (!plane->state)
 		return;
 
 	/*
-	 * Set defaults depending on whether we are a primary or overlay
+	 * Set the zpos default depending on whether we are a primary or overlay
 	 * plane.
 	 */
-	omap_state->zorder = plane->type == DRM_PLANE_TYPE_PRIMARY
+	plane->state->zpos = plane->type == DRM_PLANE_TYPE_PRIMARY
 			   ? 0 : omap_plane->id;
-	omap_state->base.rotation = DRM_ROTATE_0;
-
-	plane->state = &omap_state->base;
-	plane->state->plane = plane;
 }
 
 static int omap_plane_atomic_set_property(struct drm_plane *plane,
@@ -289,10 +239,9 @@ static int omap_plane_atomic_set_property(struct drm_plane *plane,
 					  uint64_t val)
 {
 	struct omap_drm_private *priv = plane->dev->dev_private;
-	struct omap_plane_state *omap_state = to_omap_plane_state(state);
 
 	if (property == priv->zorder_prop)
-		omap_state->zorder = val;
+		state->zpos = val;
 	else
 		return -EINVAL;
 
@@ -305,11 +254,9 @@ static int omap_plane_atomic_get_property(struct drm_plane *plane,
 					  uint64_t *val)
 {
 	struct omap_drm_private *priv = plane->dev->dev_private;
-	const struct omap_plane_state *omap_state =
-		container_of(state, const struct omap_plane_state, base);
 
 	if (property == priv->zorder_prop)
-		*val = omap_state->zorder;
+		*val = state->zpos;
 	else
 		return -EINVAL;
 
@@ -322,8 +269,8 @@ static const struct drm_plane_funcs omap_plane_funcs = {
 	.reset = omap_plane_reset,
 	.destroy = omap_plane_destroy,
 	.set_property = drm_atomic_helper_plane_set_property,
-	.atomic_duplicate_state = omap_plane_atomic_duplicate_state,
-	.atomic_destroy_state = omap_plane_atomic_destroy_state,
+	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
 	.atomic_set_property = omap_plane_atomic_set_property,
 	.atomic_get_property = omap_plane_atomic_get_property,
 };
-- 
Regards,

Laurent Pinchart