drm/exynos: make zpos property configurable

This patch adds all infrastructure to make zpos plane property
configurable from userspace.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

drivers/gpu/drm/exynos/exynos_drm_drv.h

@@ -64,6 +64,7 @@ struct exynos_drm_plane_state {
 	struct exynos_drm_rect src;
 	unsigned int h_ratio;
 	unsigned int v_ratio;
+	unsigned int zpos;
 };
 
 static inline struct exynos_drm_plane_state *
@@ -91,11 +92,12 @@ struct exynos_drm_plane {
 
 #define EXYNOS_DRM_PLANE_CAP_DOUBLE	(1 << 0)
 #define EXYNOS_DRM_PLANE_CAP_SCALE	(1 << 1)
+#define EXYNOS_DRM_PLANE_CAP_ZPOS	(1 << 2)
 
 /*
  * Exynos DRM plane configuration structure.
  *
- * @zpos: z-position of the plane.
+ * @zpos: initial z-position of the plane.
  * @type: type of the plane (primary, cursor or overlay).
  * @pixel_formats: supported pixel formats.
  * @num_pixel_formats: number of elements in 'pixel_formats'.

drivers/gpu/drm/exynos/exynos_drm_plane.c

@@ -124,6 +124,7 @@ static void exynos_plane_mode_set(struct exynos_drm_plane_state *exynos_state)
 
 static void exynos_drm_plane_reset(struct drm_plane *plane)
 {
+	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 	struct exynos_drm_plane_state *exynos_state;
 
 	if (plane->state) {
@@ -136,6 +137,7 @@ static void exynos_drm_plane_reset(struct drm_plane *plane)
 
 	exynos_state = kzalloc(sizeof(*exynos_state), GFP_KERNEL);
 	if (exynos_state) {
+		exynos_state->zpos = exynos_plane->config->zpos;
 		plane->state = &exynos_state->base;
 		plane->state->plane = plane;
 	}
@@ -153,6 +155,7 @@ exynos_drm_plane_duplicate_state(struct drm_plane *plane)
 		return NULL;
 
 	__drm_atomic_helper_plane_duplicate_state(plane, &copy->base);
+	copy->zpos = exynos_state->zpos;
 	return &copy->base;
 }
 
@@ -165,13 +168,53 @@ static void exynos_drm_plane_destroy_state(struct drm_plane *plane,
 	kfree(old_exynos_state);
 }
 
+static int exynos_drm_plane_atomic_set_property(struct drm_plane *plane,
+						struct drm_plane_state *state,
+						struct drm_property *property,
+						uint64_t val)
+{
+	struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
+	struct exynos_drm_plane_state *exynos_state =
+					to_exynos_plane_state(state);
+	struct exynos_drm_private *dev_priv = plane->dev->dev_private;
+	const struct exynos_drm_plane_config *config = exynos_plane->config;
+
+	if (property == dev_priv->plane_zpos_property &&
+	    (config->capabilities & EXYNOS_DRM_PLANE_CAP_ZPOS))
+		exynos_state->zpos = val;
+	else
+		return -EINVAL;
+
+	return 0;
+}
+
+static int exynos_drm_plane_atomic_get_property(struct drm_plane *plane,
+					  const struct drm_plane_state *state,
+					  struct drm_property *property,
+					  uint64_t *val)
+{
+	const struct exynos_drm_plane_state *exynos_state =
+		container_of(state, const struct exynos_drm_plane_state, base);
+	struct exynos_drm_private *dev_priv = plane->dev->dev_private;
+
+	if (property == dev_priv->plane_zpos_property)
+		*val = exynos_state->zpos;
+	else
+		return -EINVAL;
+
+	return 0;
+}
+
 static struct drm_plane_funcs exynos_plane_funcs = {
 	.update_plane	= drm_atomic_helper_update_plane,
 	.disable_plane	= drm_atomic_helper_disable_plane,
 	.destroy	= drm_plane_cleanup,
+	.set_property	= drm_atomic_helper_plane_set_property,
 	.reset		= exynos_drm_plane_reset,
 	.atomic_duplicate_state = exynos_drm_plane_duplicate_state,
 	.atomic_destroy_state = exynos_drm_plane_destroy_state,
+	.atomic_set_property = exynos_drm_plane_atomic_set_property,
+	.atomic_get_property = exynos_drm_plane_atomic_get_property,
 };
 
 static int
@@ -267,8 +310,8 @@ static void exynos_plane_attach_zpos_property(struct drm_plane *plane,
 
 	prop = dev_priv->plane_zpos_property;
 	if (!prop) {
-		prop = drm_property_create_range(dev, DRM_MODE_PROP_IMMUTABLE,
-						 "zpos", 0, MAX_PLANE - 1);
+		prop = drm_property_create_range(dev, 0, "zpos",
+						 0, MAX_PLANE - 1);
 		if (!prop)
 			return;
 
@@ -301,9 +344,7 @@ int exynos_plane_init(struct drm_device *dev,
 	exynos_plane->index = index;
 	exynos_plane->config = config;
 
-	if (config->type == DRM_PLANE_TYPE_OVERLAY)
-		exynos_plane_attach_zpos_property(&exynos_plane->base,
-						  config->zpos);
+	exynos_plane_attach_zpos_property(&exynos_plane->base, config->zpos);
 
 	return 0;
 }