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/*
* 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;
}
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