+ } else if (property == config->zpos_property) {
+ state->zpos = val;
} else if (plane->funcs->atomic_set_property) {
return plane->funcs->atomic_set_property(plane, state,
property, val);
@@ -670,6 +672,8 @@ drm_atomic_plane_get_property(struct drm_plane *plane,
*val = state->src_h;
} else if (property == config->rotation_property) {
*val = state->rotation;
+ } else if (property == config->zpos_property) {
+ *val = state->zpos;
} else if (plane->funcs->atomic_get_property) {
return plane->funcs->atomic_get_property(plane, state, property, val);
} else {
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index d0d4b2ff7c21..257946fac94b 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -31,6 +31,7 @@
#include <drm/drm_crtc_helper.h>
#include <drm/drm_atomic_helper.h>
#include <linux/fence.h>
+#include <linux/sort.h>
/**
* DOC: overview
@@ -507,6 +508,117 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
}
EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
+static int drm_atomic_state_zpos_cmp(const void *a, const void *b)
+{
+ const struct drm_plane_state *sa = *(struct drm_plane_state **)a;
+ const struct drm_plane_state *sb = *(struct drm_plane_state **)b;
+ int zpos_a = (sa->zpos << 16) + sa->plane->base.id;
+ int zpos_b = (sb->zpos << 16) + sb->plane->base.id;
+
+ return zpos_a - zpos_b;
+}
+
+/**
+ * drm_atomic_helper_crtc_normalize_zpos - calculate normalized zpos values
+ * @crtc: crtc with planes, which have to be considered for normalization
+ * @crtc_state: new atomic state to apply
+ *
+ * This function checks new states of all planes assigned to given crtc and
+ * calculates normalized zpos value for them. Planes are compared first by their
+ * zpos values, then by plane id (if zpos equals). Plane with lowest zpos value
+ * is at the bottom. The plane_state->normalized_zpos is then filled with uniqe
+ * values from 0 to number of active planes in crtc minus one.
+ *
+ * RETURNS
+ * Zero for success or -errno
+ */
+int drm_atomic_helper_crtc_normalize_zpos(struct drm_crtc *crtc,
+ struct drm_crtc_state *crtc_state)
+{
+ struct drm_atomic_state *state = crtc_state->state;
+ struct drm_device *dev = crtc->dev;
+ int total_planes = dev->mode_config.num_total_plane;
+ struct drm_plane_state **states;
+ struct drm_plane *plane;
+ int i, n = 0;
+ int ret = 0;
+
+ DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos values\n",
+ crtc->base.id, crtc->name);
+
+ states = kmalloc(total_planes * sizeof(*states), GFP_KERNEL);
+ if (!states)
+ return -ENOMEM;
+
+ /*
+ * Normalization process might create new states for planes which
+ * normalized_zpos has to be recalculated.
+ */
+ drm_for_each_plane_mask(plane, dev, crtc_state->plane_mask) {
+ struct drm_plane_state *plane_state =
+ drm_atomic_get_plane_state(state, plane);
+ if (IS_ERR(plane_state)) {
+ ret = PTR_ERR(plane_state);
+ goto fail;
+ }
+ states[n++] = plane_state;
+ DRM_DEBUG_ATOMIC("[PLANE:%d:%s] processing zpos value %d\n",
+ plane->base.id, plane->name, plane_state->zpos);
+ }
+
+ sort(states, n, sizeof(*states), drm_atomic_state_zpos_cmp, NULL);
+
+ for (i = 0; i < n; i++) {
+ plane = states[i]->plane;
+ states[i]->normalized_zpos = i;
+ DRM_DEBUG_ATOMIC("[PLANE:%d:%s] normalized zpos value %d\n",
+ plane->base.id, plane->name, i);
+ }
+fail:
+ kfree(states);
+ return ret;
+}
+EXPORT_SYMBOL(drm_atomic_helper_crtc_normalize_zpos);
+
+static int drm_atomic_helper_normalize_zpos(struct drm_device *dev,
+ struct drm_atomic_state *state)
+{
+ struct drm_crtc *crtc;
+ struct drm_crtc_state *crtc_state;
+ struct drm_plane *plane;
+ struct drm_plane_state *plane_state;
+ int i, ret = 0;
+
+ /*
+ * If zpos_property is not initialized, then it makes no sense
+ * to calculate normalized zpos values.
+ */
+ if (!dev->mode_config.zpos_property)
+ return 0;
+
+ for_each_plane_in_state(state, plane, plane_state, i) {
+ crtc = plane_state->crtc;
+ if (!crtc)
+ continue;
+ if (plane->state->zpos != plane_state->zpos) {
+ crtc_state =
+ drm_atomic_get_existing_crtc_state(state, crtc);
+ crtc_state->zpos_changed = true;
+ }
+ }
+
+ for_each_crtc_in_state(state, crtc, crtc_state, i) {
+ if (crtc_state->plane_mask != crtc->state->plane_mask ||
+ crtc_state->zpos_changed) {
+ ret = drm_atomic_helper_crtc_normalize_zpos(crtc,
+ crtc_state);
+ if (ret)
+ return ret;
+ }
+ }
+ return 0;
+}
+
/**
* drm_atomic_helper_check_planes - validate state object for planes changes
* @dev: DRM device
@@ -532,6 +644,10 @@ drm_atomic_helper_check_planes(struct drm_device *dev,
struct drm_plane_state *plane_state;
int i, ret = 0;
+ ret = drm_atomic_helper_normalize_zpos(dev, state);
+ if (ret)
+ return ret;
+
for_each_plane_in_state(state, plane, plane_state, i) {
const struct drm_plane_helper_funcs *funcs;
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 62fa95fa5471..54a21e7c1ca5 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -5880,6 +5880,59 @@ struct drm_property *drm_mode_create_rotation_property(struct drm_device *dev,
EXPORT_SYMBOL(drm_mode_create_rotation_property);
/**
+ * drm_mode_create_zpos_property - create muttable zpos property
+ * @dev: DRM device
+ *
+ * This function initializes generic muttable zpos property and enables support
+ * for it in drm core. Drivers can then attach this property to planes to enable
+ * support for configurable planes arrangement during blending operation.
+ * Drivers can also use drm_atomic_helper_normalize_zpos() function to calculate
+ * drm_plane_state->normalized_zpos values.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_create_zpos_property(struct drm_device *dev)
+{
+ struct drm_property *prop;
+
+ prop = drm_property_create_range(dev, 0, "zpos", 0, 255);
+ if (!prop)
+ return -ENOMEM;
+
+ dev->mode_config.zpos_property = prop;
+ return 0;
+}
+EXPORT_SYMBOL(drm_mode_create_zpos_property);
+
+/**
+ * drm_plane_create_zpos_property - create immuttable zpos property
+ * @dev: DRM device
+ *
+ * This function initializes generic immuttable zpos property and enables
+ * support for it in drm core. Using this property driver lets userspace
+ * to get the arrangement of the planes for blending operation and notifies
+ * it that the hardware (or driver) doesn't support changing of the planes'
+ * order.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_create_zpos_immutable_property(struct drm_device *dev)
+{
+ struct drm_property *prop;
+
+ prop = drm_property_create_range(dev, DRM_MODE_PROP_IMMUTABLE, "zpos",
+ 0, 255);
+ if (!prop)
+ return -ENOMEM;
+
+ dev->mode_config.zpos_immutable_property = prop;
+ return 0;
+}
+EXPORT_SYMBOL(drm_mode_create_zpos_immutable_property);
+
+/**
* DOC: Tile group
*
* Tile groups are used to represent tiled monitors with a unique
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 3b040b355472..0607ad2ce918 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -305,6 +305,7 @@ struct drm_plane_helper_funcs;
* @mode_changed: crtc_state->mode or crtc_state->enable has been changed
* @active_changed: crtc_state->active has been toggled.
* @connectors_changed: connectors to this crtc have been updated
+ * @zpos_changed: zpos values of planes on this crtc have been updated
* @plane_mask: bitmask of (1 << drm_plane_index(plane)) of attached planes
* @last_vblank_count: for helpers and drivers to capture the vblank of the
* update to ensure framebuffer cleanup isn't done too early
@@ -331,6 +332,7 @@ struct drm_crtc_state {
bool mode_changed : 1;
bool active_changed : 1;
bool connectors_changed : 1;
+ bool zpos_changed : 1;
/* attached planes bitmask:
* WARNING: transitional helpers do not maintain plane_mask so
@@ -1243,6 +1245,9 @@ struct drm_connector {
* plane (in 16.16)
* @src_w: width of visible portion of plane (in 16.16)
* @src_h: height of visible portion of plane (in 16.16)
+ * @zpos: priority of the given plane on crtc (optional)
+ * @normalized_zpos: normalized value of zpos: uniqe, range from 0 to
+ * (number of planes - 1) for given crtc
* @state: backpointer to global drm_atomic_state
*/
struct drm_plane_state {
@@ -1263,6 +1268,10 @@ struct drm_plane_state {
/* Plane rotation */
unsigned int rotation;
+ /* Plane zpos */
+ unsigned int zpos;
+ unsigned int normalized_zpos;
+
struct drm_atomic_state *state;
};
@@ -2083,6 +2092,8 @@ struct drm_mode_config {
struct drm_property *tile_property;
struct drm_property *plane_type_property;
struct drm_property *rotation_property;
+ struct drm_property *zpos_property;
+ struct drm_property *zpos_immutable_property;
struct drm_property *prop_src_x;
struct drm_property *prop_src_y;
struct drm_property *prop_src_w;
@@ -2484,6 +2495,9 @@ extern struct drm_property *drm_mode_create_rotation_property(struct drm_device
extern unsigned int drm_rotation_simplify(unsigned int rotation,
unsigned int supported_rotations);
+extern int drm_mode_create_zpos_property(struct drm_device *dev);
+extern int drm_mode_create_zpos_immutable_property(struct drm_device *dev);
+
/* Helpers */
static inline struct drm_plane *drm_plane_find(struct drm_device *dev,
--
1.9.2
