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