summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/drm_simple_kms_helper.c
blob: 987a353c7f720113fe4e07e81d76ba4a581d4394 (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
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
/*
 * Copyright (C) 2016 Noralf Trønnes
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <drm/drmP.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_simple_kms_helper.h>
#include <linux/slab.h>

/**
 * DOC: overview
 *
 * This helper library provides helpers for drivers for simple display
 * hardware.
 *
 * drm_simple_display_pipe_init() initializes a simple display pipeline
 * which has only one full-screen scanout buffer feeding one output. The
 * pipeline is represented by &struct drm_simple_display_pipe and binds
 * together &drm_plane, &drm_crtc and &drm_encoder structures into one fixed
 * entity. Some flexibility for code reuse is provided through a separately
 * allocated &drm_connector object and supporting optional &drm_bridge
 * encoder drivers.
 */

static const struct drm_encoder_funcs drm_simple_kms_encoder_funcs = {
	.destroy = drm_encoder_cleanup,
};

static enum drm_mode_status
drm_simple_kms_crtc_mode_valid(struct drm_crtc *crtc,
			       const struct drm_display_mode *mode)
{
	struct drm_simple_display_pipe *pipe;

	pipe = container_of(crtc, struct drm_simple_display_pipe, crtc);
	if (!pipe->funcs || !pipe->funcs->mode_valid)
		/* Anything goes */
		return MODE_OK;

	return pipe->funcs->mode_valid(crtc, mode);
}

static int drm_simple_kms_crtc_check(struct drm_crtc *crtc,
				     struct drm_crtc_state *state)
{
	bool has_primary = state->plane_mask &
			   BIT(drm_plane_index(crtc->primary));

	/* We always want to have an active plane with an active CRTC */
	if (has_primary != state->enable)
		return -EINVAL;

	return drm_atomic_add_affected_planes(state->state, crtc);
}

static void drm_simple_kms_crtc_enable(struct drm_crtc *crtc,
				       struct drm_crtc_state *old_state)
{
	struct drm_simple_display_pipe *pipe;

	pipe = container_of(crtc, struct drm_simple_display_pipe, crtc);
	if (!pipe->funcs || !pipe->funcs->enable)
		return;

	pipe->funcs->enable(pipe, crtc->state);
}

static void drm_simple_kms_crtc_disable(struct drm_crtc *crtc,
					struct drm_crtc_state *old_state)
{
	struct drm_simple_display_pipe *pipe;

	pipe = container_of(crtc, struct drm_simple_display_pipe, crtc);
	if (!pipe->funcs || !pipe->funcs->disable)
		return;

	pipe->funcs->disable(pipe);
}

static const struct drm_crtc_helper_funcs drm_simple_kms_crtc_helper_funcs = {
	.mode_valid = drm_simple_kms_crtc_mode_valid,
	.atomic_check = drm_simple_kms_crtc_check,
	.atomic_enable = drm_simple_kms_crtc_enable,
	.atomic_disable = drm_simple_kms_crtc_disable,
};

static int drm_simple_kms_crtc_enable_vblank(struct drm_crtc *crtc)
{
	struct drm_simple_display_pipe *pipe;

	pipe = container_of(crtc, struct drm_simple_display_pipe, crtc);
	if (!pipe->funcs || !pipe->funcs->enable_vblank)
		return 0;

	return pipe->funcs->enable_vblank(pipe);
}

static void drm_simple_kms_crtc_disable_vblank(struct drm_crtc *crtc)
{
	struct drm_simple_display_pipe *pipe;

	pipe = container_of(crtc, struct drm_simple_display_pipe, crtc);
	if (!pipe->funcs || !pipe->funcs->disable_vblank)
		return;

	pipe->funcs->disable_vblank(pipe);
}

static const struct drm_crtc_funcs drm_simple_kms_crtc_funcs = {
	.reset = drm_atomic_helper_crtc_reset,
	.destroy = drm_crtc_cleanup,
	.set_config = drm_atomic_helper_set_config,
	.page_flip = drm_atomic_helper_page_flip,
	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
	.enable_vblank = drm_simple_kms_crtc_enable_vblank,
	.disable_vblank = drm_simple_kms_crtc_disable_vblank,
};

static int drm_simple_kms_plane_atomic_check(struct drm_plane *plane,
					struct drm_plane_state *plane_state)
{
	struct drm_simple_display_pipe *pipe;
	struct drm_crtc_state *crtc_state;
	int ret;

	pipe = container_of(plane, struct drm_simple_display_pipe, plane);
	crtc_state = drm_atomic_get_new_crtc_state(plane_state->state,
						   &pipe->crtc);

	ret = drm_atomic_helper_check_plane_state(plane_state, crtc_state,
						  DRM_PLANE_HELPER_NO_SCALING,
						  DRM_PLANE_HELPER_NO_SCALING,
						  false, true);
	if (ret)
		return ret;

	if (!plane_state->visible)
		return 0;

	if (!pipe->funcs || !pipe->funcs->check)
		return 0;

	return pipe->funcs->check(pipe, plane_state, crtc_state);
}

static void drm_simple_kms_plane_atomic_update(struct drm_plane *plane,
					struct drm_plane_state *old_pstate)
{
	struct drm_simple_display_pipe *pipe;

	pipe = container_of(plane, struct drm_simple_display_pipe, plane);
	if (!pipe->funcs || !pipe->funcs->update)
		return;

	pipe->funcs->update(pipe, old_pstate);
}

static int drm_simple_kms_plane_prepare_fb(struct drm_plane *plane,
					   struct drm_plane_state *state)
{
	struct drm_simple_display_pipe *pipe;

	pipe = container_of(plane, struct drm_simple_display_pipe, plane);
	if (!pipe->funcs || !pipe->funcs->prepare_fb)
		return 0;

	return pipe->funcs->prepare_fb(pipe, state);
}

static void drm_simple_kms_plane_cleanup_fb(struct drm_plane *plane,
					    struct drm_plane_state *state)
{
	struct drm_simple_display_pipe *pipe;

	pipe = container_of(plane, struct drm_simple_display_pipe, plane);
	if (!pipe->funcs || !pipe->funcs->cleanup_fb)
		return;

	pipe->funcs->cleanup_fb(pipe, state);
}

static const struct drm_plane_helper_funcs drm_simple_kms_plane_helper_funcs = {
	.prepare_fb = drm_simple_kms_plane_prepare_fb,
	.cleanup_fb = drm_simple_kms_plane_cleanup_fb,
	.atomic_check = drm_simple_kms_plane_atomic_check,
	.atomic_update = drm_simple_kms_plane_atomic_update,
};

static const struct drm_plane_funcs drm_simple_kms_plane_funcs = {
	.update_plane		= drm_atomic_helper_update_plane,
	.disable_plane		= drm_atomic_helper_disable_plane,
	.destroy		= drm_plane_cleanup,
	.reset			= drm_atomic_helper_plane_reset,
	.atomic_duplicate_state	= drm_atomic_helper_plane_duplicate_state,
	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
};

/**
 * drm_simple_display_pipe_attach_bridge - Attach a bridge to the display pipe
 * @pipe: simple display pipe object
 * @bridge: bridge to attach
 *
 * Makes it possible to still use the drm_simple_display_pipe helpers when
 * a DRM bridge has to be used.
 *
 * Note that you probably want to initialize the pipe by passing a NULL
 * connector to drm_simple_display_pipe_init().
 *
 * Returns:
 * Zero on success, negative error code on failure.
 */
int drm_simple_display_pipe_attach_bridge(struct drm_simple_display_pipe *pipe,
					  struct drm_bridge *bridge)
{
	return drm_bridge_attach(&pipe->encoder, bridge, NULL);
}
EXPORT_SYMBOL(drm_simple_display_pipe_attach_bridge);

/**
 * drm_simple_display_pipe_init - Initialize a simple display pipeline
 * @dev: DRM device
 * @pipe: simple display pipe object to initialize
 * @funcs: callbacks for the display pipe (optional)
 * @formats: array of supported formats (DRM_FORMAT\_\*)
 * @format_count: number of elements in @formats
 * @format_modifiers: array of formats modifiers
 * @connector: connector to attach and register (optional)
 *
 * Sets up a display pipeline which consist of a really simple
 * plane-crtc-encoder pipe.
 *
 * If a connector is supplied, the pipe will be coupled with the provided
 * connector. You may supply a NULL connector when using drm bridges, that
 * handle connectors themselves (see drm_simple_display_pipe_attach_bridge()).
 *
 * Teardown of a simple display pipe is all handled automatically by the drm
 * core through calling drm_mode_config_cleanup(). Drivers afterwards need to
 * release the memory for the structure themselves.
 *
 * Returns:
 * Zero on success, negative error code on failure.
 */
int drm_simple_display_pipe_init(struct drm_device *dev,
			struct drm_simple_display_pipe *pipe,
			const struct drm_simple_display_pipe_funcs *funcs,
			const uint32_t *formats, unsigned int format_count,
			const uint64_t *format_modifiers,
			struct drm_connector *connector)
{
	struct drm_encoder *encoder = &pipe->encoder;
	struct drm_plane *plane = &pipe->plane;
	struct drm_crtc *crtc = &pipe->crtc;
	int ret;

	pipe->connector = connector;
	pipe->funcs = funcs;

	drm_plane_helper_add(plane, &drm_simple_kms_plane_helper_funcs);
	ret = drm_universal_plane_init(dev, plane, 0,
				       &drm_simple_kms_plane_funcs,
				       formats, format_count,
				       format_modifiers,
				       DRM_PLANE_TYPE_PRIMARY, NULL);
	if (ret)
		return ret;

	drm_crtc_helper_add(crtc, &drm_simple_kms_crtc_helper_funcs);
	ret = drm_crtc_init_with_planes(dev, crtc, plane, NULL,
					&drm_simple_kms_crtc_funcs, NULL);
	if (ret)
		return ret;

	encoder->possible_crtcs = 1 << drm_crtc_index(crtc);
	ret = drm_encoder_init(dev, encoder, &drm_simple_kms_encoder_funcs,
			       DRM_MODE_ENCODER_NONE, NULL);
	if (ret || !connector)
		return ret;

	return drm_mode_connector_attach_encoder(connector, encoder);
}
EXPORT_SYMBOL(drm_simple_display_pipe_init);

MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud