summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/drm_blend.c
blob: f3c0942bd7568ab0221faa7d12f0e862ae81b7b4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
/*
 * 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;
}
OpenPOWER on IntegriCloud