--- /dev/null
+/*
+ * Copyright (C) 2016 Samsung Electronics Co.Ltd
+ * Authors:
+ * Marek Szyprowski <m.szyprowski@samsung.com>
+ *
+ * DRM core plane blending related functions
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission. The copyright holders make no representations
+ * about the suitability of this software for any purpose. It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+#include <drm/drmP.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_crtc.h>
+#include <linux/export.h>
+#include <linux/slab.h>
+#include <linux/sort.h>
+
+#include "drm_internal.h"
+
+/**
+ * drm_plane_create_zpos_property - create mutable zpos property
+ * @plane: drm plane
+ * @zpos: initial value of zpos property
+ * @min: minimal possible value of zpos property
+ * @max: maximal possible value of zpos property
+ *
+ * This function initializes generic mutable 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.
+ * Once mutable zpos property has been enabled, the DRM core will automatically
+ * calculate drm_plane_state->normalized_zpos values. Usually min should be set
+ * to 0 and max to maximal number of planes for given crtc - 1.
+ *
+ * If zpos of some planes cannot be changed (like fixed background or
+ * cursor/topmost planes), driver should adjust min/max values and assign those
+ * planes immutable zpos property with lower or higher values (for more
+ * information, see drm_mode_create_zpos_immutable_property() function). In such
+ * case driver should also assign proper initial zpos values for all planes in
+ * its plane_reset() callback, so the planes will be always sorted properly.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_plane_create_zpos_property(struct drm_plane *plane,
+ unsigned int zpos,
+ unsigned int min, unsigned int max)
+{
+ struct drm_property *prop;
+
+ prop = drm_property_create_range(plane->dev, 0, "zpos", min, max);
+ if (!prop)
+ return -ENOMEM;
+
+ drm_object_attach_property(&plane->base, prop, zpos);
+
+ plane->zpos_property = prop;
+
+ if (plane->state) {
+ plane->state->zpos = zpos;
+ plane->state->normalized_zpos = zpos;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_plane_create_zpos_property);
+
+/**
+ * drm_plane_create_zpos_immutable_property - create immuttable zpos property
+ * @plane: drm plane
+ * @zpos: value of zpos property
+ *
+ * This function initializes generic immutable 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_plane_create_zpos_immutable_property(struct drm_plane *plane,
+ unsigned int zpos)
+{
+ struct drm_property *prop;
+
+ prop = drm_property_create_range(plane->dev, DRM_MODE_PROP_IMMUTABLE,
+ "zpos", zpos, zpos);
+ if (!prop)
+ return -ENOMEM;
+
+ drm_object_attach_property(&plane->base, prop, zpos);
+
+ plane->zpos_property = prop;
+
+ if (plane->state) {
+ plane->state->zpos = zpos;
+ plane->state->normalized_zpos = zpos;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_plane_create_zpos_immutable_property);
+
+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;
+
+ if (sa->zpos != sb->zpos)
+ return sa->zpos - sb->zpos;
+ else
+ return sa->plane->base.id - sb->plane->base.id;
+}
+
+/**
+ * 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 unique
+ * values from 0 to number of active planes in crtc minus one.
+ *
+ * RETURNS
+ * Zero for success or -errno
+ */
+static 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_array(total_planes, sizeof(*states), GFP_TEMPORARY);
+ 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 done;
+ }
+ 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);
+ }
+ crtc_state->zpos_changed = true;
+
+done:
+ kfree(states);
+ return ret;
+}
+
+/**
+ * drm_atomic_helper_normalize_zpos - calculate normalized zpos values for all
+ * crtcs
+ * @dev: DRM device
+ * @state: atomic state of DRM device
+ *
+ * This function calculates normalized zpos value for all modified planes in
+ * the provided atomic state of DRM device. For more information, see
+ * drm_atomic_helper_crtc_normalize_zpos() function.
+ *
+ * RETURNS
+ * Zero for success or -errno
+ */
+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;
+
+ 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;
+}
* @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
* @color_mgmt_changed: color management properties have changed (degamma or
* gamma LUT or CSC matrix)
* @plane_mask: bitmask of (1 << drm_plane_index(plane)) of attached planes
bool mode_changed : 1;
bool active_changed : 1;
bool connectors_changed : 1;
+ bool zpos_changed : 1;
bool color_mgmt_changed : 1;
/* attached planes bitmask:
* @src_w: width of visible portion of plane (in 16.16)
* @src_h: height of visible portion of plane (in 16.16)
* @rotation: rotation of the plane
+ * @zpos: priority of the given plane on crtc (optional)
+ * @normalized_zpos: normalized value of zpos: unique, range from 0 to N-1
+ * where N is the number of active planes for given crtc
* @state: backpointer to global drm_atomic_state
*/
struct drm_plane_state {
/* Plane rotation */
unsigned int rotation;
+ /* Plane zpos */
+ unsigned int zpos;
+ unsigned int normalized_zpos;
+
struct drm_atomic_state *state;
};
* @properties: property tracking for this plane
* @type: type of plane (overlay, primary, cursor)
* @state: current atomic state for this plane
+ * @zpos_property: zpos property for this plane
* @helper_private: mid-layer private data
*/
struct drm_plane {
const struct drm_plane_helper_funcs *helper_private;
struct drm_plane_state *state;
+
+ struct drm_property *zpos_property;
};
/**
uint degamma_lut_size,
bool has_ctm,
uint gamma_lut_size);
+
+int drm_plane_create_zpos_property(struct drm_plane *plane,
+ unsigned int zpos,
+ unsigned int min, unsigned int max);
+
+int drm_plane_create_zpos_immutable_property(struct drm_plane *plane,
+ unsigned int zpos);
+
/* Helpers */
struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
uint32_t id, uint32_t type);
projects / platform / kernel / linux-amlogic.git / commitdiff