aboutsummaryrefslogtreecommitdiff
path: root/include/drm/drm_encoder.h
blob: 8d8245ec0181d043324f86ea15b22a63ce12c227 (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
/*
 * Copyright (c) 2016 Intel Corporation
 *
 * 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.
 */

#ifndef __DRM_ENCODER_H__
#define __DRM_ENCODER_H__

#include <linux/list.h>
#include <linux/ctype.h>
#include <drm/drm_crtc.h>
#include <drm/drm_mode.h>
#include <drm/drm_mode_object.h>

struct drm_encoder;

/**
 * struct drm_encoder_funcs - encoder controls
 *
 * Encoders sit between CRTCs and connectors.
 */
struct drm_encoder_funcs {
	/**
	 * @reset:
	 *
	 * Reset encoder hardware and software state to off. This function isn't
	 * called by the core directly, only through drm_mode_config_reset().
	 * It's not a helper hook only for historical reasons.
	 */
	void (*reset)(struct drm_encoder *encoder);

	/**
	 * @destroy:
	 *
	 * Clean up encoder resources. This is only called at driver unload time
	 * through drm_mode_config_cleanup() since an encoder cannot be
	 * hotplugged in DRM.
	 */
	void (*destroy)(struct drm_encoder *encoder);

	/**
	 * @late_register:
	 *
	 * This optional hook can be used to register additional userspace
	 * interfaces attached to the encoder like debugfs interfaces.
	 * It is called late in the driver load sequence from drm_dev_register().
	 * Everything added from this callback should be unregistered in
	 * the early_unregister callback.
	 *
	 * Returns:
	 *
	 * 0 on success, or a negative error code on failure.
	 */
	int (*late_register)(struct drm_encoder *encoder);

	/**
	 * @early_unregister:
	 *
	 * This optional hook should be used to unregister the additional
	 * userspace interfaces attached to the encoder from
	 * @late_register. It is called from drm_dev_unregister(),
	 * early in the driver unload sequence to disable userspace access
	 * before data structures are torndown.
	 */
	void (*early_unregister)(struct drm_encoder *encoder);
};

/**
 * struct drm_encoder - central DRM encoder structure
 * @dev: parent DRM device
 * @head: list management
 * @base: base KMS object
 * @name: human readable name, can be overwritten by the driver
 * @crtc: currently bound CRTC
 * @bridge: bridge associated to the encoder
 * @funcs: control functions
 * @helper_private: mid-layer private data
 *
 * CRTCs drive pixels to encoders, which convert them into signals
 * appropriate for a given connector or set of connectors.
 */
struct drm_encoder {
	struct drm_device *dev;
	struct list_head head;

	struct drm_mode_object base;
	char *name;
	/**
	 * @encoder_type:
	 *
	 * One of the DRM_MODE_ENCODER_<foo> types in drm_mode.h. The following
	 * encoder types are defined thus far:
	 *
	 * - DRM_MODE_ENCODER_DAC for VGA and analog on DVI-I/DVI-A.
	 *
	 * - DRM_MODE_ENCODER_TMDS for DVI, HDMI and (embedded) DisplayPort.
	 *
	 * - DRM_MODE_ENCODER_LVDS for display panels, or in general any panel
	 *   with a proprietary parallel connector.
	 *
	 * - DRM_MODE_ENCODER_TVDAC for TV output (Composite, S-Video,
	 *   Component, SCART).
	 *
	 * - DRM_MODE_ENCODER_VIRTUAL for virtual machine displays
	 *
	 * - DRM_MODE_ENCODER_DSI for panels connected using the DSI serial bus.
	 *
	 * - DRM_MODE_ENCODER_DPI for panels connected using the DPI parallel
	 *   bus.
	 *
	 * - DRM_MODE_ENCODER_DPMST for special fake encoders used to allow
	 *   mutliple DP MST streams to share one physical encoder.
	 */
	int encoder_type;

	/**
	 * @index: Position inside the mode_config.list, can be used as an array
	 * index. It is invariant over the lifetime of the encoder.
	 */
	unsigned index;

	/**
	 * @possible_crtcs: Bitmask of potential CRTC bindings, using
	 * drm_crtc_index() as the index into the bitfield. The driver must set
	 * the bits for all &drm_crtc objects this encoder can be connected to
	 * before calling drm_encoder_init().
	 *
	 * In reality almost every driver gets this wrong.
	 *
	 * Note that since CRTC objects can't be hotplugged the assigned indices
	 * are stable and hence known before registering all objects.
	 */
	uint32_t possible_crtcs;

	/**
	 * @possible_clones: Bitmask of potential sibling encoders for cloning,
	 * using drm_encoder_index() as the index into the bitfield. The driver
	 * must set the bits for all &drm_encoder objects which can clone a
	 * &drm_crtc together with this encoder before calling
	 * drm_encoder_init(). Drivers should set the bit representing the
	 * encoder itself, too. Cloning bits should be set such that when two
	 * encoders can be used in a cloned configuration, they both should have
	 * each another bits set.
	 *
	 * In reality almost every driver gets this wrong.
	 *
	 * Note that since encoder objects can't be hotplugged the assigned indices
	 * are stable and hence known before registering all objects.
	 */
	uint32_t possible_clones;

	struct drm_crtc *crtc;
	struct drm_bridge *bridge;
	const struct drm_encoder_funcs *funcs;
	const struct drm_encoder_helper_funcs *helper_private;
};

#define obj_to_encoder(x) container_of(x, struct drm_encoder, base)

__printf(5, 6)
int drm_encoder_init(struct drm_device *dev,
		     struct drm_encoder *encoder,
		     const struct drm_encoder_funcs *funcs,
		     int encoder_type, const char *name, ...);

/**
 * drm_encoder_index - find the index of a registered encoder
 * @encoder: encoder to find index for
 *
 * Given a registered encoder, return the index of that encoder within a DRM
 * device's list of encoders.
 */
static inline unsigned int drm_encoder_index(struct drm_encoder *encoder)
{
	return encoder->index;
}

/**
 * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
 * @encoder: encoder to test
 * @crtc: crtc to test
 *
 * Returns false if @encoder can't be driven by @crtc, true otherwise.
 */
static inline bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
				       struct drm_crtc *crtc)
{
	return !!(encoder->possible_crtcs & drm_crtc_mask(crtc));
}

/**
 * drm_encoder_find - find a &drm_encoder
 * @dev: DRM device
 * @id: encoder id
 *
 * Returns the encoder with @id, NULL if it doesn't exist. Simple wrapper around
 * drm_mode_object_find().
 */
static inline struct drm_encoder *drm_encoder_find(struct drm_device *dev,
						   uint32_t id)
{
	struct drm_mode_object *mo;

	mo = drm_mode_object_find(dev, id, DRM_MODE_OBJECT_ENCODER);

	return mo ? obj_to_encoder(mo) : NULL;
}

void drm_encoder_cleanup(struct drm_encoder *encoder);

/**
 * drm_for_each_encoder_mask - iterate over encoders specified by bitmask
 * @encoder: the loop cursor
 * @dev: the DRM device
 * @encoder_mask: bitmask of encoder indices
 *
 * Iterate over all encoders specified by bitmask.
 */
#define drm_for_each_encoder_mask(encoder, dev, encoder_mask) \
	list_for_each_entry((encoder), &(dev)->mode_config.encoder_list, head) \
		for_each_if ((encoder_mask) & (1 << drm_encoder_index(encoder)))

/**
 * drm_for_each_encoder - iterate over all encoders
 * @encoder: the loop cursor
 * @dev: the DRM device
 *
 * Iterate over all encoders of @dev.
 */
#define drm_for_each_encoder(encoder, dev) \
	list_for_each_entry(encoder, &(dev)->mode_config.encoder_list, head)

#endif