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321a95ae DV |
1 | /* |
2 | * Copyright (c) 2016 Intel Corporation | |
3 | * | |
4 | * Permission to use, copy, modify, distribute, and sell this software and its | |
5 | * documentation for any purpose is hereby granted without fee, provided that | |
6 | * the above copyright notice appear in all copies and that both that copyright | |
7 | * notice and this permission notice appear in supporting documentation, and | |
8 | * that the name of the copyright holders not be used in advertising or | |
9 | * publicity pertaining to distribution of the software without specific, | |
10 | * written prior permission. The copyright holders make no representations | |
11 | * about the suitability of this software for any purpose. It is provided "as | |
12 | * is" without express or implied warranty. | |
13 | * | |
14 | * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, | |
15 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO | |
16 | * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR | |
17 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, | |
18 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER | |
19 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE | |
20 | * OF THIS SOFTWARE. | |
21 | */ | |
22 | ||
23 | #include <linux/export.h> | |
24 | #include <drm/drmP.h> | |
25 | #include <drm/drm_encoder.h> | |
26 | ||
27 | #include "drm_crtc_internal.h" | |
28 | ||
e03e6de0 DV |
29 | /** |
30 | * DOC: overview | |
31 | * | |
32 | * Encoders represent the connecting element between the CRTC (as the overall | |
33 | * pixel pipeline, represented by struct &drm_crtc) and the connectors (as the | |
f15e6bb0 DP |
34 | * generic sink entity, represented by struct &drm_connector). An encoder takes |
35 | * pixel data from a CRTC and converts it to a format suitable for any attached | |
36 | * connector. Encoders are objects exposed to userspace, originally to allow | |
37 | * userspace to infer cloning and connector/CRTC restrictions. Unfortunately | |
38 | * almost all drivers get this wrong, making the uabi pretty much useless. On | |
39 | * top of that the exposed restrictions are too simple for today's hardware, and | |
40 | * the recommended way to infer restrictions is by using the | |
41 | * DRM_MODE_ATOMIC_TEST_ONLY flag for the atomic IOCTL. | |
e03e6de0 DV |
42 | * |
43 | * Otherwise encoders aren't used in the uapi at all (any modeset request from | |
44 | * userspace directly connects a connector with a CRTC), drivers are therefore | |
45 | * free to use them however they wish. Modeset helper libraries make strong use | |
46 | * of encoders to facilitate code sharing. But for more complex settings it is | |
47 | * usually better to move shared code into a separate &drm_bridge. Compared to | |
f15e6bb0 | 48 | * encoders, bridges also have the benefit of being purely an internal |
e03e6de0 DV |
49 | * abstraction since they are not exposed to userspace at all. |
50 | * | |
51 | * Encoders are initialized with drm_encoder_init() and cleaned up using | |
52 | * drm_encoder_cleanup(). | |
53 | */ | |
321a95ae DV |
54 | static const struct drm_prop_enum_list drm_encoder_enum_list[] = { |
55 | { DRM_MODE_ENCODER_NONE, "None" }, | |
56 | { DRM_MODE_ENCODER_DAC, "DAC" }, | |
57 | { DRM_MODE_ENCODER_TMDS, "TMDS" }, | |
58 | { DRM_MODE_ENCODER_LVDS, "LVDS" }, | |
59 | { DRM_MODE_ENCODER_TVDAC, "TV" }, | |
60 | { DRM_MODE_ENCODER_VIRTUAL, "Virtual" }, | |
61 | { DRM_MODE_ENCODER_DSI, "DSI" }, | |
62 | { DRM_MODE_ENCODER_DPMST, "DP MST" }, | |
63 | { DRM_MODE_ENCODER_DPI, "DPI" }, | |
64 | }; | |
65 | ||
66 | int drm_encoder_register_all(struct drm_device *dev) | |
67 | { | |
68 | struct drm_encoder *encoder; | |
69 | int ret = 0; | |
70 | ||
71 | drm_for_each_encoder(encoder, dev) { | |
72 | if (encoder->funcs->late_register) | |
73 | ret = encoder->funcs->late_register(encoder); | |
74 | if (ret) | |
75 | return ret; | |
76 | } | |
77 | ||
78 | return 0; | |
79 | } | |
80 | ||
81 | void drm_encoder_unregister_all(struct drm_device *dev) | |
82 | { | |
83 | struct drm_encoder *encoder; | |
84 | ||
85 | drm_for_each_encoder(encoder, dev) { | |
86 | if (encoder->funcs->early_unregister) | |
87 | encoder->funcs->early_unregister(encoder); | |
88 | } | |
89 | } | |
90 | ||
91 | /** | |
92 | * drm_encoder_init - Init a preallocated encoder | |
93 | * @dev: drm device | |
94 | * @encoder: the encoder to init | |
95 | * @funcs: callbacks for this encoder | |
96 | * @encoder_type: user visible type of the encoder | |
97 | * @name: printf style format string for the encoder name, or NULL for default name | |
98 | * | |
e03e6de0 DV |
99 | * Initialises a preallocated encoder. Encoder should be subclassed as part of |
100 | * driver encoder objects. At driver unload time drm_encoder_cleanup() should be | |
101 | * called from the driver's destroy hook in &drm_encoder_funcs. | |
321a95ae DV |
102 | * |
103 | * Returns: | |
104 | * Zero on success, error code on failure. | |
105 | */ | |
106 | int drm_encoder_init(struct drm_device *dev, | |
e03e6de0 DV |
107 | struct drm_encoder *encoder, |
108 | const struct drm_encoder_funcs *funcs, | |
109 | int encoder_type, const char *name, ...) | |
321a95ae DV |
110 | { |
111 | int ret; | |
112 | ||
113 | drm_modeset_lock_all(dev); | |
114 | ||
115 | ret = drm_mode_object_get(dev, &encoder->base, DRM_MODE_OBJECT_ENCODER); | |
116 | if (ret) | |
117 | goto out_unlock; | |
118 | ||
119 | encoder->dev = dev; | |
120 | encoder->encoder_type = encoder_type; | |
121 | encoder->funcs = funcs; | |
122 | if (name) { | |
123 | va_list ap; | |
124 | ||
125 | va_start(ap, name); | |
126 | encoder->name = kvasprintf(GFP_KERNEL, name, ap); | |
127 | va_end(ap); | |
128 | } else { | |
129 | encoder->name = kasprintf(GFP_KERNEL, "%s-%d", | |
130 | drm_encoder_enum_list[encoder_type].name, | |
131 | encoder->base.id); | |
132 | } | |
133 | if (!encoder->name) { | |
134 | ret = -ENOMEM; | |
135 | goto out_put; | |
136 | } | |
137 | ||
138 | list_add_tail(&encoder->head, &dev->mode_config.encoder_list); | |
139 | encoder->index = dev->mode_config.num_encoder++; | |
140 | ||
141 | out_put: | |
142 | if (ret) | |
143 | drm_mode_object_unregister(dev, &encoder->base); | |
144 | ||
145 | out_unlock: | |
146 | drm_modeset_unlock_all(dev); | |
147 | ||
148 | return ret; | |
149 | } | |
150 | EXPORT_SYMBOL(drm_encoder_init); | |
151 | ||
152 | /** | |
153 | * drm_encoder_cleanup - cleans up an initialised encoder | |
154 | * @encoder: encoder to cleanup | |
155 | * | |
156 | * Cleans up the encoder but doesn't free the object. | |
157 | */ | |
158 | void drm_encoder_cleanup(struct drm_encoder *encoder) | |
159 | { | |
160 | struct drm_device *dev = encoder->dev; | |
161 | ||
162 | /* Note that the encoder_list is considered to be static; should we | |
163 | * remove the drm_encoder at runtime we would have to decrement all | |
164 | * the indices on the drm_encoder after us in the encoder_list. | |
165 | */ | |
166 | ||
167 | drm_modeset_lock_all(dev); | |
168 | drm_mode_object_unregister(dev, &encoder->base); | |
169 | kfree(encoder->name); | |
170 | list_del(&encoder->head); | |
171 | dev->mode_config.num_encoder--; | |
172 | drm_modeset_unlock_all(dev); | |
173 | ||
174 | memset(encoder, 0, sizeof(*encoder)); | |
175 | } | |
176 | EXPORT_SYMBOL(drm_encoder_cleanup); | |
177 | ||
178 | static struct drm_crtc *drm_encoder_get_crtc(struct drm_encoder *encoder) | |
179 | { | |
180 | struct drm_connector *connector; | |
181 | struct drm_device *dev = encoder->dev; | |
182 | bool uses_atomic = false; | |
183 | ||
184 | /* For atomic drivers only state objects are synchronously updated and | |
185 | * protected by modeset locks, so check those first. */ | |
186 | drm_for_each_connector(connector, dev) { | |
187 | if (!connector->state) | |
188 | continue; | |
189 | ||
190 | uses_atomic = true; | |
191 | ||
192 | if (connector->state->best_encoder != encoder) | |
193 | continue; | |
194 | ||
195 | return connector->state->crtc; | |
196 | } | |
197 | ||
198 | /* Don't return stale data (e.g. pending async disable). */ | |
199 | if (uses_atomic) | |
200 | return NULL; | |
201 | ||
202 | return encoder->crtc; | |
203 | } | |
204 | ||
321a95ae DV |
205 | int drm_mode_getencoder(struct drm_device *dev, void *data, |
206 | struct drm_file *file_priv) | |
207 | { | |
208 | struct drm_mode_get_encoder *enc_resp = data; | |
209 | struct drm_encoder *encoder; | |
210 | struct drm_crtc *crtc; | |
211 | ||
212 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
213 | return -EINVAL; | |
214 | ||
215 | encoder = drm_encoder_find(dev, enc_resp->encoder_id); | |
216 | if (!encoder) | |
217 | return -ENOENT; | |
218 | ||
219 | drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); | |
220 | crtc = drm_encoder_get_crtc(encoder); | |
221 | if (crtc) | |
222 | enc_resp->crtc_id = crtc->base.id; | |
223 | else | |
224 | enc_resp->crtc_id = 0; | |
225 | drm_modeset_unlock(&dev->mode_config.connection_mutex); | |
226 | ||
227 | enc_resp->encoder_type = encoder->encoder_type; | |
228 | enc_resp->encoder_id = encoder->base.id; | |
229 | enc_resp->possible_crtcs = encoder->possible_crtcs; | |
230 | enc_resp->possible_clones = encoder->possible_clones; | |
231 | ||
232 | return 0; | |
233 | } |