Line data Source code
1 : /*
2 : * Copyright (c) 2006-2008 Intel Corporation
3 : * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
4 : *
5 : * DRM core CRTC related functions
6 : *
7 : * Permission to use, copy, modify, distribute, and sell this software and its
8 : * documentation for any purpose is hereby granted without fee, provided that
9 : * the above copyright notice appear in all copies and that both that copyright
10 : * notice and this permission notice appear in supporting documentation, and
11 : * that the name of the copyright holders not be used in advertising or
12 : * publicity pertaining to distribution of the software without specific,
13 : * written prior permission. The copyright holders make no representations
14 : * about the suitability of this software for any purpose. It is provided "as
15 : * is" without express or implied warranty.
16 : *
17 : * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 : * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
19 : * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
20 : * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
21 : * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
22 : * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
23 : * OF THIS SOFTWARE.
24 : *
25 : * Authors:
26 : * Keith Packard
27 : * Eric Anholt <eric@anholt.net>
28 : * Dave Airlie <airlied@linux.ie>
29 : * Jesse Barnes <jesse.barnes@intel.com>
30 : */
31 :
32 : #include <linux/export.h>
33 : #include <linux/kernel.h>
34 : #include <linux/moduleparam.h>
35 :
36 : #include <drm/drm_atomic.h>
37 : #include <drm/drm_atomic_helper.h>
38 : #include <drm/drm_atomic_uapi.h>
39 : #include <drm/drm_bridge.h>
40 : #include <drm/drm_crtc.h>
41 : #include <drm/drm_crtc_helper.h>
42 : #include <drm/drm_drv.h>
43 : #include <drm/drm_edid.h>
44 : #include <drm/drm_encoder.h>
45 : #include <drm/drm_fb_helper.h>
46 : #include <drm/drm_fourcc.h>
47 : #include <drm/drm_plane_helper.h>
48 : #include <drm/drm_print.h>
49 : #include <drm/drm_vblank.h>
50 :
51 : #include "drm_crtc_helper_internal.h"
52 :
53 : /**
54 : * DOC: overview
55 : *
56 : * The CRTC modeset helper library provides a default set_config implementation
57 : * in drm_crtc_helper_set_config(). Plus a few other convenience functions using
58 : * the same callbacks which drivers can use to e.g. restore the modeset
59 : * configuration on resume with drm_helper_resume_force_mode().
60 : *
61 : * Note that this helper library doesn't track the current power state of CRTCs
62 : * and encoders. It can call callbacks like &drm_encoder_helper_funcs.dpms even
63 : * though the hardware is already in the desired state. This deficiency has been
64 : * fixed in the atomic helpers.
65 : *
66 : * The driver callbacks are mostly compatible with the atomic modeset helpers,
67 : * except for the handling of the primary plane: Atomic helpers require that the
68 : * primary plane is implemented as a real standalone plane and not directly tied
69 : * to the CRTC state. For easier transition this library provides functions to
70 : * implement the old semantics required by the CRTC helpers using the new plane
71 : * and atomic helper callbacks.
72 : *
73 : * Drivers are strongly urged to convert to the atomic helpers (by way of first
74 : * converting to the plane helpers). New drivers must not use these functions
75 : * but need to implement the atomic interface instead, potentially using the
76 : * atomic helpers for that.
77 : *
78 : * These legacy modeset helpers use the same function table structures as
79 : * all other modesetting helpers. See the documentation for struct
80 : * &drm_crtc_helper_funcs, &struct drm_encoder_helper_funcs and struct
81 : * &drm_connector_helper_funcs.
82 : */
83 :
84 : /**
85 : * drm_helper_encoder_in_use - check if a given encoder is in use
86 : * @encoder: encoder to check
87 : *
88 : * Checks whether @encoder is with the current mode setting output configuration
89 : * in use by any connector. This doesn't mean that it is actually enabled since
90 : * the DPMS state is tracked separately.
91 : *
92 : * Returns:
93 : * True if @encoder is used, false otherwise.
94 : */
95 0 : bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
96 : {
97 : struct drm_connector *connector;
98 : struct drm_connector_list_iter conn_iter;
99 0 : struct drm_device *dev = encoder->dev;
100 :
101 0 : WARN_ON(drm_drv_uses_atomic_modeset(dev));
102 :
103 : /*
104 : * We can expect this mutex to be locked if we are not panicking.
105 : * Locking is currently fubar in the panic handler.
106 : */
107 0 : if (!oops_in_progress) {
108 0 : WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
109 0 : WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
110 : }
111 :
112 :
113 0 : drm_connector_list_iter_begin(dev, &conn_iter);
114 0 : drm_for_each_connector_iter(connector, &conn_iter) {
115 0 : if (connector->encoder == encoder) {
116 0 : drm_connector_list_iter_end(&conn_iter);
117 0 : return true;
118 : }
119 : }
120 0 : drm_connector_list_iter_end(&conn_iter);
121 0 : return false;
122 : }
123 : EXPORT_SYMBOL(drm_helper_encoder_in_use);
124 :
125 : /**
126 : * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
127 : * @crtc: CRTC to check
128 : *
129 : * Checks whether @crtc is with the current mode setting output configuration
130 : * in use by any connector. This doesn't mean that it is actually enabled since
131 : * the DPMS state is tracked separately.
132 : *
133 : * Returns:
134 : * True if @crtc is used, false otherwise.
135 : */
136 0 : bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
137 : {
138 : struct drm_encoder *encoder;
139 0 : struct drm_device *dev = crtc->dev;
140 :
141 0 : WARN_ON(drm_drv_uses_atomic_modeset(dev));
142 :
143 : /*
144 : * We can expect this mutex to be locked if we are not panicking.
145 : * Locking is currently fubar in the panic handler.
146 : */
147 0 : if (!oops_in_progress)
148 0 : WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
149 :
150 0 : drm_for_each_encoder(encoder, dev)
151 0 : if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
152 : return true;
153 : return false;
154 : }
155 : EXPORT_SYMBOL(drm_helper_crtc_in_use);
156 :
157 : static void
158 0 : drm_encoder_disable(struct drm_encoder *encoder)
159 : {
160 0 : const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
161 :
162 0 : if (!encoder_funcs)
163 : return;
164 :
165 0 : if (encoder_funcs->disable)
166 0 : (*encoder_funcs->disable)(encoder);
167 0 : else if (encoder_funcs->dpms)
168 0 : (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
169 : }
170 :
171 0 : static void __drm_helper_disable_unused_functions(struct drm_device *dev)
172 : {
173 : struct drm_encoder *encoder;
174 : struct drm_crtc *crtc;
175 :
176 0 : drm_warn_on_modeset_not_all_locked(dev);
177 :
178 0 : drm_for_each_encoder(encoder, dev) {
179 0 : if (!drm_helper_encoder_in_use(encoder)) {
180 0 : drm_encoder_disable(encoder);
181 : /* disconnect encoder from any connector */
182 0 : encoder->crtc = NULL;
183 : }
184 : }
185 :
186 0 : drm_for_each_crtc(crtc, dev) {
187 0 : const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
188 :
189 0 : crtc->enabled = drm_helper_crtc_in_use(crtc);
190 0 : if (!crtc->enabled) {
191 0 : if (crtc_funcs->disable)
192 0 : (*crtc_funcs->disable)(crtc);
193 : else
194 0 : (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
195 0 : crtc->primary->fb = NULL;
196 : }
197 : }
198 0 : }
199 :
200 : /**
201 : * drm_helper_disable_unused_functions - disable unused objects
202 : * @dev: DRM device
203 : *
204 : * This function walks through the entire mode setting configuration of @dev. It
205 : * will remove any CRTC links of unused encoders and encoder links of
206 : * disconnected connectors. Then it will disable all unused encoders and CRTCs
207 : * either by calling their disable callback if available or by calling their
208 : * dpms callback with DRM_MODE_DPMS_OFF.
209 : *
210 : * NOTE:
211 : *
212 : * This function is part of the legacy modeset helper library and will cause
213 : * major confusion with atomic drivers. This is because atomic helpers guarantee
214 : * to never call ->disable() hooks on a disabled function, or ->enable() hooks
215 : * on an enabled functions. drm_helper_disable_unused_functions() on the other
216 : * hand throws such guarantees into the wind and calls disable hooks
217 : * unconditionally on unused functions.
218 : */
219 0 : void drm_helper_disable_unused_functions(struct drm_device *dev)
220 : {
221 0 : WARN_ON(drm_drv_uses_atomic_modeset(dev));
222 :
223 0 : drm_modeset_lock_all(dev);
224 0 : __drm_helper_disable_unused_functions(dev);
225 0 : drm_modeset_unlock_all(dev);
226 0 : }
227 : EXPORT_SYMBOL(drm_helper_disable_unused_functions);
228 :
229 : /*
230 : * Check the CRTC we're going to map each output to vs. its current
231 : * CRTC. If they don't match, we have to disable the output and the CRTC
232 : * since the driver will have to re-route things.
233 : */
234 : static void
235 0 : drm_crtc_prepare_encoders(struct drm_device *dev)
236 : {
237 : const struct drm_encoder_helper_funcs *encoder_funcs;
238 : struct drm_encoder *encoder;
239 :
240 0 : drm_for_each_encoder(encoder, dev) {
241 0 : encoder_funcs = encoder->helper_private;
242 0 : if (!encoder_funcs)
243 0 : continue;
244 :
245 : /* Disable unused encoders */
246 0 : if (encoder->crtc == NULL)
247 0 : drm_encoder_disable(encoder);
248 : }
249 0 : }
250 :
251 : /**
252 : * drm_crtc_helper_set_mode - internal helper to set a mode
253 : * @crtc: CRTC to program
254 : * @mode: mode to use
255 : * @x: horizontal offset into the surface
256 : * @y: vertical offset into the surface
257 : * @old_fb: old framebuffer, for cleanup
258 : *
259 : * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
260 : * to fixup or reject the mode prior to trying to set it. This is an internal
261 : * helper that drivers could e.g. use to update properties that require the
262 : * entire output pipe to be disabled and re-enabled in a new configuration. For
263 : * example for changing whether audio is enabled on a hdmi link or for changing
264 : * panel fitter or dither attributes. It is also called by the
265 : * drm_crtc_helper_set_config() helper function to drive the mode setting
266 : * sequence.
267 : *
268 : * Returns:
269 : * True if the mode was set successfully, false otherwise.
270 : */
271 0 : bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
272 : struct drm_display_mode *mode,
273 : int x, int y,
274 : struct drm_framebuffer *old_fb)
275 : {
276 0 : struct drm_device *dev = crtc->dev;
277 : struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
278 0 : const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
279 : const struct drm_encoder_helper_funcs *encoder_funcs;
280 : int saved_x, saved_y;
281 : bool saved_enabled;
282 : struct drm_encoder *encoder;
283 0 : bool ret = true;
284 :
285 0 : WARN_ON(drm_drv_uses_atomic_modeset(dev));
286 :
287 0 : drm_warn_on_modeset_not_all_locked(dev);
288 :
289 0 : saved_enabled = crtc->enabled;
290 0 : crtc->enabled = drm_helper_crtc_in_use(crtc);
291 0 : if (!crtc->enabled)
292 : return true;
293 :
294 0 : adjusted_mode = drm_mode_duplicate(dev, mode);
295 0 : if (!adjusted_mode) {
296 0 : crtc->enabled = saved_enabled;
297 0 : return false;
298 : }
299 :
300 0 : drm_mode_init(&saved_mode, &crtc->mode);
301 0 : drm_mode_init(&saved_hwmode, &crtc->hwmode);
302 0 : saved_x = crtc->x;
303 0 : saved_y = crtc->y;
304 :
305 : /* Update crtc values up front so the driver can rely on them for mode
306 : * setting.
307 : */
308 0 : drm_mode_copy(&crtc->mode, mode);
309 0 : crtc->x = x;
310 0 : crtc->y = y;
311 :
312 : /* Pass our mode to the connectors and the CRTC to give them a chance to
313 : * adjust it according to limitations or connector properties, and also
314 : * a chance to reject the mode entirely.
315 : */
316 0 : drm_for_each_encoder(encoder, dev) {
317 :
318 0 : if (encoder->crtc != crtc)
319 0 : continue;
320 :
321 0 : encoder_funcs = encoder->helper_private;
322 0 : if (!encoder_funcs)
323 0 : continue;
324 :
325 0 : encoder_funcs = encoder->helper_private;
326 0 : if (encoder_funcs->mode_fixup) {
327 0 : if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
328 : adjusted_mode))) {
329 0 : DRM_DEBUG_KMS("Encoder fixup failed\n");
330 0 : goto done;
331 : }
332 : }
333 : }
334 :
335 0 : if (crtc_funcs->mode_fixup) {
336 0 : if (!(ret = crtc_funcs->mode_fixup(crtc, mode,
337 : adjusted_mode))) {
338 0 : DRM_DEBUG_KMS("CRTC fixup failed\n");
339 0 : goto done;
340 : }
341 : }
342 0 : DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
343 :
344 0 : drm_mode_copy(&crtc->hwmode, adjusted_mode);
345 :
346 : /* Prepare the encoders and CRTCs before setting the mode. */
347 0 : drm_for_each_encoder(encoder, dev) {
348 :
349 0 : if (encoder->crtc != crtc)
350 0 : continue;
351 :
352 0 : encoder_funcs = encoder->helper_private;
353 0 : if (!encoder_funcs)
354 0 : continue;
355 :
356 : /* Disable the encoders as the first thing we do. */
357 0 : if (encoder_funcs->prepare)
358 0 : encoder_funcs->prepare(encoder);
359 : }
360 :
361 0 : drm_crtc_prepare_encoders(dev);
362 :
363 0 : crtc_funcs->prepare(crtc);
364 :
365 : /* Set up the DPLL and any encoders state that needs to adjust or depend
366 : * on the DPLL.
367 : */
368 0 : ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
369 0 : if (!ret)
370 : goto done;
371 :
372 0 : drm_for_each_encoder(encoder, dev) {
373 :
374 0 : if (encoder->crtc != crtc)
375 0 : continue;
376 :
377 0 : encoder_funcs = encoder->helper_private;
378 0 : if (!encoder_funcs)
379 0 : continue;
380 :
381 0 : DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%s]\n",
382 : encoder->base.id, encoder->name, mode->name);
383 0 : if (encoder_funcs->mode_set)
384 0 : encoder_funcs->mode_set(encoder, mode, adjusted_mode);
385 : }
386 :
387 : /* Now enable the clocks, plane, pipe, and connectors that we set up. */
388 0 : crtc_funcs->commit(crtc);
389 :
390 0 : drm_for_each_encoder(encoder, dev) {
391 :
392 0 : if (encoder->crtc != crtc)
393 0 : continue;
394 :
395 0 : encoder_funcs = encoder->helper_private;
396 0 : if (!encoder_funcs)
397 0 : continue;
398 :
399 0 : if (encoder_funcs->commit)
400 0 : encoder_funcs->commit(encoder);
401 : }
402 :
403 : /* Calculate and store various constants which
404 : * are later needed by vblank and swap-completion
405 : * timestamping. They are derived from true hwmode.
406 : */
407 0 : drm_calc_timestamping_constants(crtc, &crtc->hwmode);
408 :
409 : /* FIXME: add subpixel order */
410 : done:
411 0 : drm_mode_destroy(dev, adjusted_mode);
412 0 : if (!ret) {
413 0 : crtc->enabled = saved_enabled;
414 0 : drm_mode_copy(&crtc->mode, &saved_mode);
415 0 : drm_mode_copy(&crtc->hwmode, &saved_hwmode);
416 0 : crtc->x = saved_x;
417 0 : crtc->y = saved_y;
418 : }
419 :
420 : return ret;
421 : }
422 : EXPORT_SYMBOL(drm_crtc_helper_set_mode);
423 :
424 : static void
425 0 : drm_crtc_helper_disable(struct drm_crtc *crtc)
426 : {
427 0 : struct drm_device *dev = crtc->dev;
428 : struct drm_connector *connector;
429 : struct drm_encoder *encoder;
430 :
431 : /* Decouple all encoders and their attached connectors from this crtc */
432 0 : drm_for_each_encoder(encoder, dev) {
433 : struct drm_connector_list_iter conn_iter;
434 :
435 0 : if (encoder->crtc != crtc)
436 0 : continue;
437 :
438 0 : drm_connector_list_iter_begin(dev, &conn_iter);
439 0 : drm_for_each_connector_iter(connector, &conn_iter) {
440 0 : if (connector->encoder != encoder)
441 0 : continue;
442 :
443 0 : connector->encoder = NULL;
444 :
445 : /*
446 : * drm_helper_disable_unused_functions() ought to be
447 : * doing this, but since we've decoupled the encoder
448 : * from the connector above, the required connection
449 : * between them is henceforth no longer available.
450 : */
451 0 : connector->dpms = DRM_MODE_DPMS_OFF;
452 :
453 : /* we keep a reference while the encoder is bound */
454 : drm_connector_put(connector);
455 : }
456 0 : drm_connector_list_iter_end(&conn_iter);
457 : }
458 :
459 0 : __drm_helper_disable_unused_functions(dev);
460 0 : }
461 :
462 : /*
463 : * For connectors that support multiple encoders, either the
464 : * .atomic_best_encoder() or .best_encoder() operation must be implemented.
465 : */
466 : struct drm_encoder *
467 0 : drm_connector_get_single_encoder(struct drm_connector *connector)
468 : {
469 : struct drm_encoder *encoder;
470 :
471 0 : WARN_ON(hweight32(connector->possible_encoders) > 1);
472 0 : drm_connector_for_each_possible_encoder(connector, encoder)
473 : return encoder;
474 :
475 : return NULL;
476 : }
477 :
478 : /**
479 : * drm_crtc_helper_set_config - set a new config from userspace
480 : * @set: mode set configuration
481 : * @ctx: lock acquire context, not used here
482 : *
483 : * The drm_crtc_helper_set_config() helper function implements the of
484 : * &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC
485 : * helpers.
486 : *
487 : * It first tries to locate the best encoder for each connector by calling the
488 : * connector @drm_connector_helper_funcs.best_encoder helper operation.
489 : *
490 : * After locating the appropriate encoders, the helper function will call the
491 : * mode_fixup encoder and CRTC helper operations to adjust the requested mode,
492 : * or reject it completely in which case an error will be returned to the
493 : * application. If the new configuration after mode adjustment is identical to
494 : * the current configuration the helper function will return without performing
495 : * any other operation.
496 : *
497 : * If the adjusted mode is identical to the current mode but changes to the
498 : * frame buffer need to be applied, the drm_crtc_helper_set_config() function
499 : * will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation.
500 : *
501 : * If the adjusted mode differs from the current mode, or if the
502 : * ->mode_set_base() helper operation is not provided, the helper function
503 : * performs a full mode set sequence by calling the ->prepare(), ->mode_set()
504 : * and ->commit() CRTC and encoder helper operations, in that order.
505 : * Alternatively it can also use the dpms and disable helper operations. For
506 : * details see &struct drm_crtc_helper_funcs and struct
507 : * &drm_encoder_helper_funcs.
508 : *
509 : * This function is deprecated. New drivers must implement atomic modeset
510 : * support, for which this function is unsuitable. Instead drivers should use
511 : * drm_atomic_helper_set_config().
512 : *
513 : * Returns:
514 : * Returns 0 on success, negative errno numbers on failure.
515 : */
516 0 : int drm_crtc_helper_set_config(struct drm_mode_set *set,
517 : struct drm_modeset_acquire_ctx *ctx)
518 : {
519 : struct drm_device *dev;
520 : struct drm_crtc **save_encoder_crtcs, *new_crtc;
521 : struct drm_encoder **save_connector_encoders, *new_encoder, *encoder;
522 0 : bool mode_changed = false; /* if true do a full mode set */
523 0 : bool fb_changed = false; /* if true and !mode_changed just do a flip */
524 : struct drm_connector *connector;
525 : struct drm_connector_list_iter conn_iter;
526 0 : int count = 0, ro, fail = 0;
527 : const struct drm_crtc_helper_funcs *crtc_funcs;
528 : struct drm_mode_set save_set;
529 : int ret;
530 : int i;
531 :
532 0 : DRM_DEBUG_KMS("\n");
533 :
534 0 : BUG_ON(!set);
535 0 : BUG_ON(!set->crtc);
536 0 : BUG_ON(!set->crtc->helper_private);
537 :
538 : /* Enforce sane interface api - has been abused by the fb helper. */
539 0 : BUG_ON(!set->mode && set->fb);
540 0 : BUG_ON(set->fb && set->num_connectors == 0);
541 :
542 0 : crtc_funcs = set->crtc->helper_private;
543 :
544 0 : dev = set->crtc->dev;
545 0 : WARN_ON(drm_drv_uses_atomic_modeset(dev));
546 :
547 0 : if (!set->mode)
548 0 : set->fb = NULL;
549 :
550 0 : if (set->fb) {
551 0 : DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n",
552 : set->crtc->base.id, set->crtc->name,
553 : set->fb->base.id,
554 : (int)set->num_connectors, set->x, set->y);
555 : } else {
556 0 : DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n",
557 : set->crtc->base.id, set->crtc->name);
558 0 : drm_crtc_helper_disable(set->crtc);
559 0 : return 0;
560 : }
561 :
562 0 : drm_warn_on_modeset_not_all_locked(dev);
563 :
564 : /*
565 : * Allocate space for the backup of all (non-pointer) encoder and
566 : * connector data.
567 : */
568 0 : save_encoder_crtcs = kcalloc(dev->mode_config.num_encoder,
569 : sizeof(struct drm_crtc *), GFP_KERNEL);
570 0 : if (!save_encoder_crtcs)
571 : return -ENOMEM;
572 :
573 0 : save_connector_encoders = kcalloc(dev->mode_config.num_connector,
574 : sizeof(struct drm_encoder *), GFP_KERNEL);
575 0 : if (!save_connector_encoders) {
576 0 : kfree(save_encoder_crtcs);
577 0 : return -ENOMEM;
578 : }
579 :
580 : /*
581 : * Copy data. Note that driver private data is not affected.
582 : * Should anything bad happen only the expected state is
583 : * restored, not the drivers personal bookkeeping.
584 : */
585 0 : count = 0;
586 0 : drm_for_each_encoder(encoder, dev) {
587 0 : save_encoder_crtcs[count++] = encoder->crtc;
588 : }
589 :
590 0 : count = 0;
591 0 : drm_connector_list_iter_begin(dev, &conn_iter);
592 0 : drm_for_each_connector_iter(connector, &conn_iter)
593 0 : save_connector_encoders[count++] = connector->encoder;
594 0 : drm_connector_list_iter_end(&conn_iter);
595 :
596 0 : save_set.crtc = set->crtc;
597 0 : save_set.mode = &set->crtc->mode;
598 0 : save_set.x = set->crtc->x;
599 0 : save_set.y = set->crtc->y;
600 0 : save_set.fb = set->crtc->primary->fb;
601 :
602 : /* We should be able to check here if the fb has the same properties
603 : * and then just flip_or_move it */
604 0 : if (set->crtc->primary->fb != set->fb) {
605 : /* If we have no fb then treat it as a full mode set */
606 0 : if (set->crtc->primary->fb == NULL) {
607 0 : DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
608 0 : mode_changed = true;
609 0 : } else if (set->fb->format != set->crtc->primary->fb->format) {
610 : mode_changed = true;
611 : } else
612 0 : fb_changed = true;
613 : }
614 :
615 0 : if (set->x != set->crtc->x || set->y != set->crtc->y)
616 0 : fb_changed = true;
617 :
618 0 : if (!drm_mode_equal(set->mode, &set->crtc->mode)) {
619 0 : DRM_DEBUG_KMS("modes are different, full mode set\n");
620 0 : drm_mode_debug_printmodeline(&set->crtc->mode);
621 0 : drm_mode_debug_printmodeline(set->mode);
622 0 : mode_changed = true;
623 : }
624 :
625 : /* take a reference on all unbound connectors in set, reuse the
626 : * already taken reference for bound connectors
627 : */
628 0 : for (ro = 0; ro < set->num_connectors; ro++) {
629 0 : if (set->connectors[ro]->encoder)
630 0 : continue;
631 0 : drm_connector_get(set->connectors[ro]);
632 : }
633 :
634 : /* a) traverse passed in connector list and get encoders for them */
635 0 : count = 0;
636 0 : drm_connector_list_iter_begin(dev, &conn_iter);
637 0 : drm_for_each_connector_iter(connector, &conn_iter) {
638 0 : const struct drm_connector_helper_funcs *connector_funcs =
639 : connector->helper_private;
640 0 : new_encoder = connector->encoder;
641 0 : for (ro = 0; ro < set->num_connectors; ro++) {
642 0 : if (set->connectors[ro] == connector) {
643 0 : if (connector_funcs->best_encoder)
644 0 : new_encoder = connector_funcs->best_encoder(connector);
645 : else
646 0 : new_encoder = drm_connector_get_single_encoder(connector);
647 :
648 : /* if we can't get an encoder for a connector
649 : we are setting now - then fail */
650 0 : if (new_encoder == NULL)
651 : /* don't break so fail path works correct */
652 0 : fail = 1;
653 :
654 0 : if (connector->dpms != DRM_MODE_DPMS_ON) {
655 0 : DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
656 0 : mode_changed = true;
657 : }
658 :
659 : break;
660 : }
661 : }
662 :
663 0 : if (new_encoder != connector->encoder) {
664 0 : DRM_DEBUG_KMS("encoder changed, full mode switch\n");
665 0 : mode_changed = true;
666 : /* If the encoder is reused for another connector, then
667 : * the appropriate crtc will be set later.
668 : */
669 0 : if (connector->encoder)
670 0 : connector->encoder->crtc = NULL;
671 0 : connector->encoder = new_encoder;
672 : }
673 : }
674 0 : drm_connector_list_iter_end(&conn_iter);
675 :
676 0 : if (fail) {
677 : ret = -EINVAL;
678 : goto fail;
679 : }
680 :
681 0 : count = 0;
682 0 : drm_connector_list_iter_begin(dev, &conn_iter);
683 0 : drm_for_each_connector_iter(connector, &conn_iter) {
684 0 : if (!connector->encoder)
685 0 : continue;
686 :
687 0 : if (connector->encoder->crtc == set->crtc)
688 : new_crtc = NULL;
689 : else
690 0 : new_crtc = connector->encoder->crtc;
691 :
692 0 : for (ro = 0; ro < set->num_connectors; ro++) {
693 0 : if (set->connectors[ro] == connector)
694 0 : new_crtc = set->crtc;
695 : }
696 :
697 : /* Make sure the new CRTC will work with the encoder */
698 0 : if (new_crtc &&
699 0 : !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
700 0 : ret = -EINVAL;
701 0 : drm_connector_list_iter_end(&conn_iter);
702 0 : goto fail;
703 : }
704 0 : if (new_crtc != connector->encoder->crtc) {
705 0 : DRM_DEBUG_KMS("crtc changed, full mode switch\n");
706 0 : mode_changed = true;
707 0 : connector->encoder->crtc = new_crtc;
708 : }
709 0 : if (new_crtc) {
710 0 : DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n",
711 : connector->base.id, connector->name,
712 : new_crtc->base.id, new_crtc->name);
713 : } else {
714 0 : DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
715 : connector->base.id, connector->name);
716 : }
717 : }
718 0 : drm_connector_list_iter_end(&conn_iter);
719 :
720 : /* mode_set_base is not a required function */
721 0 : if (fb_changed && !crtc_funcs->mode_set_base)
722 0 : mode_changed = true;
723 :
724 0 : if (mode_changed) {
725 0 : if (drm_helper_crtc_in_use(set->crtc)) {
726 0 : DRM_DEBUG_KMS("attempting to set mode from"
727 : " userspace\n");
728 0 : drm_mode_debug_printmodeline(set->mode);
729 0 : set->crtc->primary->fb = set->fb;
730 0 : if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
731 0 : set->x, set->y,
732 : save_set.fb)) {
733 0 : DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n",
734 : set->crtc->base.id, set->crtc->name);
735 0 : set->crtc->primary->fb = save_set.fb;
736 0 : ret = -EINVAL;
737 0 : goto fail;
738 : }
739 0 : DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
740 0 : for (i = 0; i < set->num_connectors; i++) {
741 0 : DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
742 : set->connectors[i]->name);
743 0 : set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
744 : }
745 : }
746 0 : __drm_helper_disable_unused_functions(dev);
747 0 : } else if (fb_changed) {
748 0 : set->crtc->x = set->x;
749 0 : set->crtc->y = set->y;
750 0 : set->crtc->primary->fb = set->fb;
751 0 : ret = crtc_funcs->mode_set_base(set->crtc,
752 0 : set->x, set->y, save_set.fb);
753 0 : if (ret != 0) {
754 0 : set->crtc->x = save_set.x;
755 0 : set->crtc->y = save_set.y;
756 0 : set->crtc->primary->fb = save_set.fb;
757 0 : goto fail;
758 : }
759 : }
760 :
761 0 : kfree(save_connector_encoders);
762 0 : kfree(save_encoder_crtcs);
763 0 : return 0;
764 :
765 : fail:
766 : /* Restore all previous data. */
767 0 : count = 0;
768 0 : drm_for_each_encoder(encoder, dev) {
769 0 : encoder->crtc = save_encoder_crtcs[count++];
770 : }
771 :
772 0 : count = 0;
773 0 : drm_connector_list_iter_begin(dev, &conn_iter);
774 0 : drm_for_each_connector_iter(connector, &conn_iter)
775 0 : connector->encoder = save_connector_encoders[count++];
776 0 : drm_connector_list_iter_end(&conn_iter);
777 :
778 : /* after fail drop reference on all unbound connectors in set, let
779 : * bound connectors keep their reference
780 : */
781 0 : for (ro = 0; ro < set->num_connectors; ro++) {
782 0 : if (set->connectors[ro]->encoder)
783 0 : continue;
784 0 : drm_connector_put(set->connectors[ro]);
785 : }
786 :
787 : /* Try to restore the config */
788 0 : if (mode_changed &&
789 0 : !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
790 : save_set.y, save_set.fb))
791 0 : DRM_ERROR("failed to restore config after modeset failure\n");
792 :
793 0 : kfree(save_connector_encoders);
794 0 : kfree(save_encoder_crtcs);
795 0 : return ret;
796 : }
797 : EXPORT_SYMBOL(drm_crtc_helper_set_config);
798 :
799 0 : static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
800 : {
801 0 : int dpms = DRM_MODE_DPMS_OFF;
802 : struct drm_connector *connector;
803 : struct drm_connector_list_iter conn_iter;
804 0 : struct drm_device *dev = encoder->dev;
805 :
806 0 : drm_connector_list_iter_begin(dev, &conn_iter);
807 0 : drm_for_each_connector_iter(connector, &conn_iter)
808 0 : if (connector->encoder == encoder)
809 0 : if (connector->dpms < dpms)
810 0 : dpms = connector->dpms;
811 0 : drm_connector_list_iter_end(&conn_iter);
812 :
813 0 : return dpms;
814 : }
815 :
816 : /* Helper which handles bridge ordering around encoder dpms */
817 : static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
818 : {
819 : const struct drm_encoder_helper_funcs *encoder_funcs;
820 :
821 0 : encoder_funcs = encoder->helper_private;
822 0 : if (!encoder_funcs)
823 : return;
824 :
825 0 : if (encoder_funcs->dpms)
826 0 : encoder_funcs->dpms(encoder, mode);
827 : }
828 :
829 0 : static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
830 : {
831 0 : int dpms = DRM_MODE_DPMS_OFF;
832 : struct drm_connector *connector;
833 : struct drm_connector_list_iter conn_iter;
834 0 : struct drm_device *dev = crtc->dev;
835 :
836 0 : drm_connector_list_iter_begin(dev, &conn_iter);
837 0 : drm_for_each_connector_iter(connector, &conn_iter)
838 0 : if (connector->encoder && connector->encoder->crtc == crtc)
839 0 : if (connector->dpms < dpms)
840 0 : dpms = connector->dpms;
841 0 : drm_connector_list_iter_end(&conn_iter);
842 :
843 0 : return dpms;
844 : }
845 :
846 : /**
847 : * drm_helper_connector_dpms() - connector dpms helper implementation
848 : * @connector: affected connector
849 : * @mode: DPMS mode
850 : *
851 : * The drm_helper_connector_dpms() helper function implements the
852 : * &drm_connector_funcs.dpms callback for drivers using the legacy CRTC
853 : * helpers.
854 : *
855 : * This is the main helper function provided by the CRTC helper framework for
856 : * implementing the DPMS connector attribute. It computes the new desired DPMS
857 : * state for all encoders and CRTCs in the output mesh and calls the
858 : * &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks
859 : * provided by the driver.
860 : *
861 : * This function is deprecated. New drivers must implement atomic modeset
862 : * support, where DPMS is handled in the DRM core.
863 : *
864 : * Returns:
865 : * Always returns 0.
866 : */
867 0 : int drm_helper_connector_dpms(struct drm_connector *connector, int mode)
868 : {
869 0 : struct drm_encoder *encoder = connector->encoder;
870 0 : struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
871 0 : int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
872 :
873 0 : WARN_ON(drm_drv_uses_atomic_modeset(connector->dev));
874 :
875 0 : if (mode == connector->dpms)
876 : return 0;
877 :
878 0 : old_dpms = connector->dpms;
879 0 : connector->dpms = mode;
880 :
881 0 : if (encoder)
882 0 : encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
883 :
884 : /* from off to on, do crtc then encoder */
885 0 : if (mode < old_dpms) {
886 0 : if (crtc) {
887 0 : const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
888 :
889 0 : if (crtc_funcs->dpms)
890 0 : (*crtc_funcs->dpms) (crtc,
891 : drm_helper_choose_crtc_dpms(crtc));
892 : }
893 0 : if (encoder)
894 : drm_helper_encoder_dpms(encoder, encoder_dpms);
895 : }
896 :
897 : /* from on to off, do encoder then crtc */
898 0 : if (mode > old_dpms) {
899 0 : if (encoder)
900 : drm_helper_encoder_dpms(encoder, encoder_dpms);
901 0 : if (crtc) {
902 0 : const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
903 :
904 0 : if (crtc_funcs->dpms)
905 0 : (*crtc_funcs->dpms) (crtc,
906 : drm_helper_choose_crtc_dpms(crtc));
907 : }
908 : }
909 :
910 : return 0;
911 : }
912 : EXPORT_SYMBOL(drm_helper_connector_dpms);
913 :
914 : /**
915 : * drm_helper_resume_force_mode - force-restore mode setting configuration
916 : * @dev: drm_device which should be restored
917 : *
918 : * Drivers which use the mode setting helpers can use this function to
919 : * force-restore the mode setting configuration e.g. on resume or when something
920 : * else might have trampled over the hw state (like some overzealous old BIOSen
921 : * tended to do).
922 : *
923 : * This helper doesn't provide a error return value since restoring the old
924 : * config should never fail due to resource allocation issues since the driver
925 : * has successfully set the restored configuration already. Hence this should
926 : * boil down to the equivalent of a few dpms on calls, which also don't provide
927 : * an error code.
928 : *
929 : * Drivers where simply restoring an old configuration again might fail (e.g.
930 : * due to slight differences in allocating shared resources when the
931 : * configuration is restored in a different order than when userspace set it up)
932 : * need to use their own restore logic.
933 : *
934 : * This function is deprecated. New drivers should implement atomic mode-
935 : * setting and use the atomic suspend/resume helpers.
936 : *
937 : * See also:
938 : * drm_atomic_helper_suspend(), drm_atomic_helper_resume()
939 : */
940 0 : void drm_helper_resume_force_mode(struct drm_device *dev)
941 : {
942 : struct drm_crtc *crtc;
943 : struct drm_encoder *encoder;
944 : const struct drm_crtc_helper_funcs *crtc_funcs;
945 : int encoder_dpms;
946 : bool ret;
947 :
948 0 : WARN_ON(drm_drv_uses_atomic_modeset(dev));
949 :
950 0 : drm_modeset_lock_all(dev);
951 0 : drm_for_each_crtc(crtc, dev) {
952 :
953 0 : if (!crtc->enabled)
954 0 : continue;
955 :
956 0 : ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
957 0 : crtc->x, crtc->y, crtc->primary->fb);
958 :
959 : /* Restoring the old config should never fail! */
960 0 : if (ret == false)
961 0 : DRM_ERROR("failed to set mode on crtc %p\n", crtc);
962 :
963 : /* Turn off outputs that were already powered off */
964 0 : if (drm_helper_choose_crtc_dpms(crtc)) {
965 0 : drm_for_each_encoder(encoder, dev) {
966 :
967 0 : if(encoder->crtc != crtc)
968 0 : continue;
969 :
970 0 : encoder_dpms = drm_helper_choose_encoder_dpms(
971 : encoder);
972 :
973 : drm_helper_encoder_dpms(encoder, encoder_dpms);
974 : }
975 :
976 0 : crtc_funcs = crtc->helper_private;
977 0 : if (crtc_funcs->dpms)
978 0 : (*crtc_funcs->dpms) (crtc,
979 : drm_helper_choose_crtc_dpms(crtc));
980 : }
981 : }
982 :
983 : /* disable the unused connectors while restoring the modesetting */
984 0 : __drm_helper_disable_unused_functions(dev);
985 0 : drm_modeset_unlock_all(dev);
986 0 : }
987 : EXPORT_SYMBOL(drm_helper_resume_force_mode);
988 :
989 : /**
990 : * drm_helper_force_disable_all - Forcibly turn off all enabled CRTCs
991 : * @dev: DRM device whose CRTCs to turn off
992 : *
993 : * Drivers may want to call this on unload to ensure that all displays are
994 : * unlit and the GPU is in a consistent, low power state. Takes modeset locks.
995 : *
996 : * Note: This should only be used by non-atomic legacy drivers. For an atomic
997 : * version look at drm_atomic_helper_shutdown().
998 : *
999 : * Returns:
1000 : * Zero on success, error code on failure.
1001 : */
1002 0 : int drm_helper_force_disable_all(struct drm_device *dev)
1003 : {
1004 : struct drm_crtc *crtc;
1005 0 : int ret = 0;
1006 :
1007 0 : drm_modeset_lock_all(dev);
1008 0 : drm_for_each_crtc(crtc, dev)
1009 0 : if (crtc->enabled) {
1010 0 : struct drm_mode_set set = {
1011 : .crtc = crtc,
1012 : };
1013 :
1014 0 : ret = drm_mode_set_config_internal(&set);
1015 0 : if (ret)
1016 : goto out;
1017 : }
1018 : out:
1019 0 : drm_modeset_unlock_all(dev);
1020 0 : return ret;
1021 : }
1022 : EXPORT_SYMBOL(drm_helper_force_disable_all);
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