Line data Source code
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 :
25 : #include <drm/drm_bridge.h>
26 : #include <drm/drm_device.h>
27 : #include <drm/drm_drv.h>
28 : #include <drm/drm_encoder.h>
29 : #include <drm/drm_managed.h>
30 : #include <drm/drm_print.h>
31 :
32 : #include "drm_crtc_internal.h"
33 :
34 : /**
35 : * DOC: overview
36 : *
37 : * Encoders represent the connecting element between the CRTC (as the overall
38 : * pixel pipeline, represented by &struct drm_crtc) and the connectors (as the
39 : * generic sink entity, represented by &struct drm_connector). An encoder takes
40 : * pixel data from a CRTC and converts it to a format suitable for any attached
41 : * connector. Encoders are objects exposed to userspace, originally to allow
42 : * userspace to infer cloning and connector/CRTC restrictions. Unfortunately
43 : * almost all drivers get this wrong, making the uabi pretty much useless. On
44 : * top of that the exposed restrictions are too simple for today's hardware, and
45 : * the recommended way to infer restrictions is by using the
46 : * DRM_MODE_ATOMIC_TEST_ONLY flag for the atomic IOCTL.
47 : *
48 : * Otherwise encoders aren't used in the uapi at all (any modeset request from
49 : * userspace directly connects a connector with a CRTC), drivers are therefore
50 : * free to use them however they wish. Modeset helper libraries make strong use
51 : * of encoders to facilitate code sharing. But for more complex settings it is
52 : * usually better to move shared code into a separate &drm_bridge. Compared to
53 : * encoders, bridges also have the benefit of being purely an internal
54 : * abstraction since they are not exposed to userspace at all.
55 : *
56 : * Encoders are initialized with drm_encoder_init() and cleaned up using
57 : * drm_encoder_cleanup().
58 : */
59 : static const struct drm_prop_enum_list drm_encoder_enum_list[] = {
60 : { DRM_MODE_ENCODER_NONE, "None" },
61 : { DRM_MODE_ENCODER_DAC, "DAC" },
62 : { DRM_MODE_ENCODER_TMDS, "TMDS" },
63 : { DRM_MODE_ENCODER_LVDS, "LVDS" },
64 : { DRM_MODE_ENCODER_TVDAC, "TV" },
65 : { DRM_MODE_ENCODER_VIRTUAL, "Virtual" },
66 : { DRM_MODE_ENCODER_DSI, "DSI" },
67 : { DRM_MODE_ENCODER_DPMST, "DP MST" },
68 : { DRM_MODE_ENCODER_DPI, "DPI" },
69 : };
70 :
71 1 : int drm_encoder_register_all(struct drm_device *dev)
72 : {
73 : struct drm_encoder *encoder;
74 1 : int ret = 0;
75 :
76 1 : drm_for_each_encoder(encoder, dev) {
77 0 : if (encoder->funcs && encoder->funcs->late_register)
78 0 : ret = encoder->funcs->late_register(encoder);
79 0 : if (ret)
80 : return ret;
81 : }
82 :
83 : return 0;
84 : }
85 :
86 1 : void drm_encoder_unregister_all(struct drm_device *dev)
87 : {
88 : struct drm_encoder *encoder;
89 :
90 1 : drm_for_each_encoder(encoder, dev) {
91 0 : if (encoder->funcs && encoder->funcs->early_unregister)
92 0 : encoder->funcs->early_unregister(encoder);
93 : }
94 1 : }
95 :
96 : __printf(5, 0)
97 0 : static int __drm_encoder_init(struct drm_device *dev,
98 : struct drm_encoder *encoder,
99 : const struct drm_encoder_funcs *funcs,
100 : int encoder_type, const char *name, va_list ap)
101 : {
102 : int ret;
103 :
104 : /* encoder index is used with 32bit bitmasks */
105 0 : if (WARN_ON(dev->mode_config.num_encoder >= 32))
106 : return -EINVAL;
107 :
108 0 : ret = drm_mode_object_add(dev, &encoder->base, DRM_MODE_OBJECT_ENCODER);
109 0 : if (ret)
110 : return ret;
111 :
112 0 : encoder->dev = dev;
113 0 : encoder->encoder_type = encoder_type;
114 0 : encoder->funcs = funcs;
115 0 : if (name) {
116 0 : encoder->name = kvasprintf(GFP_KERNEL, name, ap);
117 : } else {
118 0 : encoder->name = kasprintf(GFP_KERNEL, "%s-%d",
119 : drm_encoder_enum_list[encoder_type].name,
120 : encoder->base.id);
121 : }
122 0 : if (!encoder->name) {
123 : ret = -ENOMEM;
124 : goto out_put;
125 : }
126 :
127 0 : INIT_LIST_HEAD(&encoder->bridge_chain);
128 0 : list_add_tail(&encoder->head, &dev->mode_config.encoder_list);
129 0 : encoder->index = dev->mode_config.num_encoder++;
130 :
131 : out_put:
132 0 : if (ret)
133 0 : drm_mode_object_unregister(dev, &encoder->base);
134 :
135 : return ret;
136 : }
137 :
138 : /**
139 : * drm_encoder_init - Init a preallocated encoder
140 : * @dev: drm device
141 : * @encoder: the encoder to init
142 : * @funcs: callbacks for this encoder
143 : * @encoder_type: user visible type of the encoder
144 : * @name: printf style format string for the encoder name, or NULL for default name
145 : *
146 : * Initializes a preallocated encoder. Encoder should be subclassed as part of
147 : * driver encoder objects. At driver unload time the driver's
148 : * &drm_encoder_funcs.destroy hook should call drm_encoder_cleanup() and kfree()
149 : * the encoder structure. The encoder structure should not be allocated with
150 : * devm_kzalloc().
151 : *
152 : * Note: consider using drmm_encoder_alloc() or drmm_encoder_init()
153 : * instead of drm_encoder_init() to let the DRM managed resource
154 : * infrastructure take care of cleanup and deallocation.
155 : *
156 : * Returns:
157 : * Zero on success, error code on failure.
158 : */
159 0 : int drm_encoder_init(struct drm_device *dev,
160 : struct drm_encoder *encoder,
161 : const struct drm_encoder_funcs *funcs,
162 : int encoder_type, const char *name, ...)
163 : {
164 : va_list ap;
165 : int ret;
166 :
167 0 : WARN_ON(!funcs->destroy);
168 :
169 0 : va_start(ap, name);
170 0 : ret = __drm_encoder_init(dev, encoder, funcs, encoder_type, name, ap);
171 0 : va_end(ap);
172 :
173 0 : return ret;
174 : }
175 : EXPORT_SYMBOL(drm_encoder_init);
176 :
177 : /**
178 : * drm_encoder_cleanup - cleans up an initialised encoder
179 : * @encoder: encoder to cleanup
180 : *
181 : * Cleans up the encoder but doesn't free the object.
182 : */
183 0 : void drm_encoder_cleanup(struct drm_encoder *encoder)
184 : {
185 0 : struct drm_device *dev = encoder->dev;
186 : struct drm_bridge *bridge, *next;
187 :
188 : /* Note that the encoder_list is considered to be static; should we
189 : * remove the drm_encoder at runtime we would have to decrement all
190 : * the indices on the drm_encoder after us in the encoder_list.
191 : */
192 :
193 0 : list_for_each_entry_safe(bridge, next, &encoder->bridge_chain,
194 : chain_node)
195 0 : drm_bridge_detach(bridge);
196 :
197 0 : drm_mode_object_unregister(dev, &encoder->base);
198 0 : kfree(encoder->name);
199 0 : list_del(&encoder->head);
200 0 : dev->mode_config.num_encoder--;
201 :
202 0 : memset(encoder, 0, sizeof(*encoder));
203 0 : }
204 : EXPORT_SYMBOL(drm_encoder_cleanup);
205 :
206 0 : static void drmm_encoder_alloc_release(struct drm_device *dev, void *ptr)
207 : {
208 0 : struct drm_encoder *encoder = ptr;
209 :
210 0 : if (WARN_ON(!encoder->dev))
211 : return;
212 :
213 0 : drm_encoder_cleanup(encoder);
214 : }
215 :
216 : __printf(5, 0)
217 0 : static int __drmm_encoder_init(struct drm_device *dev,
218 : struct drm_encoder *encoder,
219 : const struct drm_encoder_funcs *funcs,
220 : int encoder_type,
221 : const char *name,
222 : va_list args)
223 : {
224 : int ret;
225 :
226 0 : if (drm_WARN_ON(dev, funcs && funcs->destroy))
227 : return -EINVAL;
228 :
229 0 : ret = __drm_encoder_init(dev, encoder, funcs, encoder_type, name, args);
230 0 : if (ret)
231 : return ret;
232 :
233 0 : ret = drmm_add_action_or_reset(dev, drmm_encoder_alloc_release, encoder);
234 0 : if (ret)
235 : return ret;
236 :
237 0 : return 0;
238 : }
239 :
240 0 : void *__drmm_encoder_alloc(struct drm_device *dev, size_t size, size_t offset,
241 : const struct drm_encoder_funcs *funcs,
242 : int encoder_type, const char *name, ...)
243 : {
244 : void *container;
245 : struct drm_encoder *encoder;
246 : va_list ap;
247 : int ret;
248 :
249 0 : container = drmm_kzalloc(dev, size, GFP_KERNEL);
250 0 : if (!container)
251 : return ERR_PTR(-ENOMEM);
252 :
253 0 : encoder = container + offset;
254 :
255 0 : va_start(ap, name);
256 0 : ret = __drmm_encoder_init(dev, encoder, funcs, encoder_type, name, ap);
257 0 : va_end(ap);
258 0 : if (ret)
259 0 : return ERR_PTR(ret);
260 :
261 : return container;
262 : }
263 : EXPORT_SYMBOL(__drmm_encoder_alloc);
264 :
265 : /**
266 : * drmm_encoder_init - Initialize a preallocated encoder
267 : * @dev: drm device
268 : * @encoder: the encoder to init
269 : * @funcs: callbacks for this encoder (optional)
270 : * @encoder_type: user visible type of the encoder
271 : * @name: printf style format string for the encoder name, or NULL for default name
272 : *
273 : * Initializes a preallocated encoder. Encoder should be subclassed as
274 : * part of driver encoder objects. Cleanup is automatically handled
275 : * through registering drm_encoder_cleanup() with drmm_add_action(). The
276 : * encoder structure should be allocated with drmm_kzalloc().
277 : *
278 : * The @drm_encoder_funcs.destroy hook must be NULL.
279 : *
280 : * Returns:
281 : * Zero on success, error code on failure.
282 : */
283 0 : int drmm_encoder_init(struct drm_device *dev, struct drm_encoder *encoder,
284 : const struct drm_encoder_funcs *funcs,
285 : int encoder_type, const char *name, ...)
286 : {
287 : va_list ap;
288 : int ret;
289 :
290 0 : va_start(ap, name);
291 0 : ret = __drmm_encoder_init(dev, encoder, funcs, encoder_type, name, ap);
292 0 : va_end(ap);
293 0 : if (ret)
294 : return ret;
295 :
296 0 : return 0;
297 : }
298 : EXPORT_SYMBOL(drmm_encoder_init);
299 :
300 0 : static struct drm_crtc *drm_encoder_get_crtc(struct drm_encoder *encoder)
301 : {
302 : struct drm_connector *connector;
303 0 : struct drm_device *dev = encoder->dev;
304 0 : bool uses_atomic = false;
305 : struct drm_connector_list_iter conn_iter;
306 :
307 : /* For atomic drivers only state objects are synchronously updated and
308 : * protected by modeset locks, so check those first. */
309 0 : drm_connector_list_iter_begin(dev, &conn_iter);
310 0 : drm_for_each_connector_iter(connector, &conn_iter) {
311 0 : if (!connector->state)
312 0 : continue;
313 :
314 0 : uses_atomic = true;
315 :
316 0 : if (connector->state->best_encoder != encoder)
317 0 : continue;
318 :
319 0 : drm_connector_list_iter_end(&conn_iter);
320 0 : return connector->state->crtc;
321 : }
322 0 : drm_connector_list_iter_end(&conn_iter);
323 :
324 : /* Don't return stale data (e.g. pending async disable). */
325 0 : if (uses_atomic)
326 : return NULL;
327 :
328 0 : return encoder->crtc;
329 : }
330 :
331 0 : int drm_mode_getencoder(struct drm_device *dev, void *data,
332 : struct drm_file *file_priv)
333 : {
334 0 : struct drm_mode_get_encoder *enc_resp = data;
335 : struct drm_encoder *encoder;
336 : struct drm_crtc *crtc;
337 :
338 0 : if (!drm_core_check_feature(dev, DRIVER_MODESET))
339 : return -EOPNOTSUPP;
340 :
341 0 : encoder = drm_encoder_find(dev, file_priv, enc_resp->encoder_id);
342 0 : if (!encoder)
343 : return -ENOENT;
344 :
345 0 : drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
346 0 : crtc = drm_encoder_get_crtc(encoder);
347 0 : if (crtc && drm_lease_held(file_priv, crtc->base.id))
348 0 : enc_resp->crtc_id = crtc->base.id;
349 : else
350 0 : enc_resp->crtc_id = 0;
351 0 : drm_modeset_unlock(&dev->mode_config.connection_mutex);
352 :
353 0 : enc_resp->encoder_type = encoder->encoder_type;
354 0 : enc_resp->encoder_id = encoder->base.id;
355 0 : enc_resp->possible_crtcs = drm_lease_filter_crtcs(file_priv,
356 : encoder->possible_crtcs);
357 0 : enc_resp->possible_clones = encoder->possible_clones;
358 :
359 0 : return 0;
360 : }
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