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[karo-tx-linux.git] / drivers / gpu / drm / drm_crtc_helper.c
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/kernel.h>
33 #include <linux/export.h>
34 #include <linux/moduleparam.h>
35
36 #include <drm/drmP.h>
37 #include <drm/drm_atomic.h>
38 #include <drm/drm_crtc.h>
39 #include <drm/drm_encoder.h>
40 #include <drm/drm_fourcc.h>
41 #include <drm/drm_crtc_helper.h>
42 #include <drm/drm_fb_helper.h>
43 #include <drm/drm_plane_helper.h>
44 #include <drm/drm_atomic_helper.h>
45 #include <drm/drm_edid.h>
46
47 /**
48  * DOC: overview
49  *
50  * The CRTC modeset helper library provides a default set_config implementation
51  * in drm_crtc_helper_set_config(). Plus a few other convenience functions using
52  * the same callbacks which drivers can use to e.g. restore the modeset
53  * configuration on resume with drm_helper_resume_force_mode().
54  *
55  * Note that this helper library doesn't track the current power state of CRTCs
56  * and encoders. It can call callbacks like &drm_encoder_helper_funcs.dpms even
57  * though the hardware is already in the desired state. This deficiency has been
58  * fixed in the atomic helpers.
59  *
60  * The driver callbacks are mostly compatible with the atomic modeset helpers,
61  * except for the handling of the primary plane: Atomic helpers require that the
62  * primary plane is implemented as a real standalone plane and not directly tied
63  * to the CRTC state. For easier transition this library provides functions to
64  * implement the old semantics required by the CRTC helpers using the new plane
65  * and atomic helper callbacks.
66  *
67  * Drivers are strongly urged to convert to the atomic helpers (by way of first
68  * converting to the plane helpers). New drivers must not use these functions
69  * but need to implement the atomic interface instead, potentially using the
70  * atomic helpers for that.
71  *
72  * These legacy modeset helpers use the same function table structures as
73  * all other modesetting helpers. See the documentation for struct
74  * &drm_crtc_helper_funcs, &struct drm_encoder_helper_funcs and struct
75  * &drm_connector_helper_funcs.
76  */
77
78 /**
79  * drm_helper_encoder_in_use - check if a given encoder is in use
80  * @encoder: encoder to check
81  *
82  * Checks whether @encoder is with the current mode setting output configuration
83  * in use by any connector. This doesn't mean that it is actually enabled since
84  * the DPMS state is tracked separately.
85  *
86  * Returns:
87  * True if @encoder is used, false otherwise.
88  */
89 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
90 {
91         struct drm_connector *connector;
92         struct drm_connector_list_iter conn_iter;
93         struct drm_device *dev = encoder->dev;
94
95         /*
96          * We can expect this mutex to be locked if we are not panicking.
97          * Locking is currently fubar in the panic handler.
98          */
99         if (!oops_in_progress) {
100                 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
101                 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
102         }
103
104
105         drm_connector_list_iter_get(dev, &conn_iter);
106         drm_for_each_connector_iter(connector, &conn_iter) {
107                 if (connector->encoder == encoder) {
108                         drm_connector_list_iter_put(&conn_iter);
109                         return true;
110                 }
111         }
112         drm_connector_list_iter_put(&conn_iter);
113         return false;
114 }
115 EXPORT_SYMBOL(drm_helper_encoder_in_use);
116
117 /**
118  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
119  * @crtc: CRTC to check
120  *
121  * Checks whether @crtc is with the current mode setting output configuration
122  * in use by any connector. This doesn't mean that it is actually enabled since
123  * the DPMS state is tracked separately.
124  *
125  * Returns:
126  * True if @crtc is used, false otherwise.
127  */
128 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
129 {
130         struct drm_encoder *encoder;
131         struct drm_device *dev = crtc->dev;
132
133         /*
134          * We can expect this mutex to be locked if we are not panicking.
135          * Locking is currently fubar in the panic handler.
136          */
137         if (!oops_in_progress)
138                 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
139
140         drm_for_each_encoder(encoder, dev)
141                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
142                         return true;
143         return false;
144 }
145 EXPORT_SYMBOL(drm_helper_crtc_in_use);
146
147 static void
148 drm_encoder_disable(struct drm_encoder *encoder)
149 {
150         const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
151
152         if (!encoder_funcs)
153                 return;
154
155         drm_bridge_disable(encoder->bridge);
156
157         if (encoder_funcs->disable)
158                 (*encoder_funcs->disable)(encoder);
159         else if (encoder_funcs->dpms)
160                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
161
162         drm_bridge_post_disable(encoder->bridge);
163 }
164
165 static void __drm_helper_disable_unused_functions(struct drm_device *dev)
166 {
167         struct drm_encoder *encoder;
168         struct drm_crtc *crtc;
169
170         drm_warn_on_modeset_not_all_locked(dev);
171
172         drm_for_each_encoder(encoder, dev) {
173                 if (!drm_helper_encoder_in_use(encoder)) {
174                         drm_encoder_disable(encoder);
175                         /* disconnect encoder from any connector */
176                         encoder->crtc = NULL;
177                 }
178         }
179
180         drm_for_each_crtc(crtc, dev) {
181                 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
182                 crtc->enabled = drm_helper_crtc_in_use(crtc);
183                 if (!crtc->enabled) {
184                         if (crtc_funcs->disable)
185                                 (*crtc_funcs->disable)(crtc);
186                         else
187                                 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
188                         crtc->primary->fb = NULL;
189                 }
190         }
191 }
192
193 /**
194  * drm_helper_disable_unused_functions - disable unused objects
195  * @dev: DRM device
196  *
197  * This function walks through the entire mode setting configuration of @dev. It
198  * will remove any CRTC links of unused encoders and encoder links of
199  * disconnected connectors. Then it will disable all unused encoders and CRTCs
200  * either by calling their disable callback if available or by calling their
201  * dpms callback with DRM_MODE_DPMS_OFF.
202  *
203  * NOTE:
204  *
205  * This function is part of the legacy modeset helper library and will cause
206  * major confusion with atomic drivers. This is because atomic helpers guarantee
207  * to never call ->disable() hooks on a disabled function, or ->enable() hooks
208  * on an enabled functions. drm_helper_disable_unused_functions() on the other
209  * hand throws such guarantees into the wind and calls disable hooks
210  * unconditionally on unused functions.
211  */
212 void drm_helper_disable_unused_functions(struct drm_device *dev)
213 {
214         if (drm_core_check_feature(dev, DRIVER_ATOMIC))
215                 DRM_ERROR("Called for atomic driver, this is not what you want.\n");
216
217         drm_modeset_lock_all(dev);
218         __drm_helper_disable_unused_functions(dev);
219         drm_modeset_unlock_all(dev);
220 }
221 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
222
223 /*
224  * Check the CRTC we're going to map each output to vs. its current
225  * CRTC.  If they don't match, we have to disable the output and the CRTC
226  * since the driver will have to re-route things.
227  */
228 static void
229 drm_crtc_prepare_encoders(struct drm_device *dev)
230 {
231         const struct drm_encoder_helper_funcs *encoder_funcs;
232         struct drm_encoder *encoder;
233
234         drm_for_each_encoder(encoder, dev) {
235                 encoder_funcs = encoder->helper_private;
236                 if (!encoder_funcs)
237                         continue;
238
239                 /* Disable unused encoders */
240                 if (encoder->crtc == NULL)
241                         drm_encoder_disable(encoder);
242                 /* Disable encoders whose CRTC is about to change */
243                 if (encoder_funcs->get_crtc &&
244                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
245                         drm_encoder_disable(encoder);
246         }
247 }
248
249 /**
250  * drm_crtc_helper_set_mode - internal helper to set a mode
251  * @crtc: CRTC to program
252  * @mode: mode to use
253  * @x: horizontal offset into the surface
254  * @y: vertical offset into the surface
255  * @old_fb: old framebuffer, for cleanup
256  *
257  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
258  * to fixup or reject the mode prior to trying to set it. This is an internal
259  * helper that drivers could e.g. use to update properties that require the
260  * entire output pipe to be disabled and re-enabled in a new configuration. For
261  * example for changing whether audio is enabled on a hdmi link or for changing
262  * panel fitter or dither attributes. It is also called by the
263  * drm_crtc_helper_set_config() helper function to drive the mode setting
264  * sequence.
265  *
266  * Returns:
267  * True if the mode was set successfully, false otherwise.
268  */
269 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
270                               struct drm_display_mode *mode,
271                               int x, int y,
272                               struct drm_framebuffer *old_fb)
273 {
274         struct drm_device *dev = crtc->dev;
275         struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
276         const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
277         const struct drm_encoder_helper_funcs *encoder_funcs;
278         int saved_x, saved_y;
279         bool saved_enabled;
280         struct drm_encoder *encoder;
281         bool ret = true;
282
283         drm_warn_on_modeset_not_all_locked(dev);
284
285         saved_enabled = crtc->enabled;
286         crtc->enabled = drm_helper_crtc_in_use(crtc);
287         if (!crtc->enabled)
288                 return true;
289
290         adjusted_mode = drm_mode_duplicate(dev, mode);
291         if (!adjusted_mode) {
292                 crtc->enabled = saved_enabled;
293                 return false;
294         }
295
296         saved_mode = crtc->mode;
297         saved_hwmode = crtc->hwmode;
298         saved_x = crtc->x;
299         saved_y = crtc->y;
300
301         /* Update crtc values up front so the driver can rely on them for mode
302          * setting.
303          */
304         crtc->mode = *mode;
305         crtc->x = x;
306         crtc->y = y;
307
308         /* Pass our mode to the connectors and the CRTC to give them a chance to
309          * adjust it according to limitations or connector properties, and also
310          * a chance to reject the mode entirely.
311          */
312         drm_for_each_encoder(encoder, dev) {
313
314                 if (encoder->crtc != crtc)
315                         continue;
316
317                 encoder_funcs = encoder->helper_private;
318                 if (!encoder_funcs)
319                         continue;
320
321                 ret = drm_bridge_mode_fixup(encoder->bridge,
322                         mode, adjusted_mode);
323                 if (!ret) {
324                         DRM_DEBUG_KMS("Bridge fixup failed\n");
325                         goto done;
326                 }
327
328                 encoder_funcs = encoder->helper_private;
329                 if (encoder_funcs->mode_fixup) {
330                         if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
331                                                               adjusted_mode))) {
332                                 DRM_DEBUG_KMS("Encoder fixup failed\n");
333                                 goto done;
334                         }
335                 }
336         }
337
338         if (crtc_funcs->mode_fixup) {
339                 if (!(ret = crtc_funcs->mode_fixup(crtc, mode,
340                                                 adjusted_mode))) {
341                         DRM_DEBUG_KMS("CRTC fixup failed\n");
342                         goto done;
343                 }
344         }
345         DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
346
347         crtc->hwmode = *adjusted_mode;
348
349         /* Prepare the encoders and CRTCs before setting the mode. */
350         drm_for_each_encoder(encoder, dev) {
351
352                 if (encoder->crtc != crtc)
353                         continue;
354
355                 encoder_funcs = encoder->helper_private;
356                 if (!encoder_funcs)
357                         continue;
358
359                 drm_bridge_disable(encoder->bridge);
360
361                 /* Disable the encoders as the first thing we do. */
362                 if (encoder_funcs->prepare)
363                         encoder_funcs->prepare(encoder);
364
365                 drm_bridge_post_disable(encoder->bridge);
366         }
367
368         drm_crtc_prepare_encoders(dev);
369
370         crtc_funcs->prepare(crtc);
371
372         /* Set up the DPLL and any encoders state that needs to adjust or depend
373          * on the DPLL.
374          */
375         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
376         if (!ret)
377             goto done;
378
379         drm_for_each_encoder(encoder, dev) {
380
381                 if (encoder->crtc != crtc)
382                         continue;
383
384                 encoder_funcs = encoder->helper_private;
385                 if (!encoder_funcs)
386                         continue;
387
388                 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
389                         encoder->base.id, encoder->name,
390                         mode->base.id, mode->name);
391                 if (encoder_funcs->mode_set)
392                         encoder_funcs->mode_set(encoder, mode, adjusted_mode);
393
394                 drm_bridge_mode_set(encoder->bridge, mode, adjusted_mode);
395         }
396
397         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
398         crtc_funcs->commit(crtc);
399
400         drm_for_each_encoder(encoder, dev) {
401
402                 if (encoder->crtc != crtc)
403                         continue;
404
405                 encoder_funcs = encoder->helper_private;
406                 if (!encoder_funcs)
407                         continue;
408
409                 drm_bridge_pre_enable(encoder->bridge);
410
411                 if (encoder_funcs->commit)
412                         encoder_funcs->commit(encoder);
413
414                 drm_bridge_enable(encoder->bridge);
415         }
416
417         /* Calculate and store various constants which
418          * are later needed by vblank and swap-completion
419          * timestamping. They are derived from true hwmode.
420          */
421         drm_calc_timestamping_constants(crtc, &crtc->hwmode);
422
423         /* FIXME: add subpixel order */
424 done:
425         drm_mode_destroy(dev, adjusted_mode);
426         if (!ret) {
427                 crtc->enabled = saved_enabled;
428                 crtc->mode = saved_mode;
429                 crtc->hwmode = saved_hwmode;
430                 crtc->x = saved_x;
431                 crtc->y = saved_y;
432         }
433
434         return ret;
435 }
436 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
437
438 static void
439 drm_crtc_helper_disable(struct drm_crtc *crtc)
440 {
441         struct drm_device *dev = crtc->dev;
442         struct drm_connector *connector;
443         struct drm_encoder *encoder;
444
445         /* Decouple all encoders and their attached connectors from this crtc */
446         drm_for_each_encoder(encoder, dev) {
447                 struct drm_connector_list_iter conn_iter;
448
449                 if (encoder->crtc != crtc)
450                         continue;
451
452                 drm_connector_list_iter_get(dev, &conn_iter);
453                 drm_for_each_connector_iter(connector, &conn_iter) {
454                         if (connector->encoder != encoder)
455                                 continue;
456
457                         connector->encoder = NULL;
458
459                         /*
460                          * drm_helper_disable_unused_functions() ought to be
461                          * doing this, but since we've decoupled the encoder
462                          * from the connector above, the required connection
463                          * between them is henceforth no longer available.
464                          */
465                         connector->dpms = DRM_MODE_DPMS_OFF;
466
467                         /* we keep a reference while the encoder is bound */
468                         drm_connector_unreference(connector);
469                 }
470                 drm_connector_list_iter_put(&conn_iter);
471         }
472
473         __drm_helper_disable_unused_functions(dev);
474 }
475
476 /**
477  * drm_crtc_helper_set_config - set a new config from userspace
478  * @set: mode set configuration
479  *
480  * The drm_crtc_helper_set_config() helper function implements the of
481  * &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC
482  * helpers.
483  *
484  * It first tries to locate the best encoder for each connector by calling the
485  * connector @drm_connector_helper_funcs.best_encoder helper operation.
486  *
487  * After locating the appropriate encoders, the helper function will call the
488  * mode_fixup encoder and CRTC helper operations to adjust the requested mode,
489  * or reject it completely in which case an error will be returned to the
490  * application. If the new configuration after mode adjustment is identical to
491  * the current configuration the helper function will return without performing
492  * any other operation.
493  *
494  * If the adjusted mode is identical to the current mode but changes to the
495  * frame buffer need to be applied, the drm_crtc_helper_set_config() function
496  * will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation.
497  *
498  * If the adjusted mode differs from the current mode, or if the
499  * ->mode_set_base() helper operation is not provided, the helper function
500  * performs a full mode set sequence by calling the ->prepare(), ->mode_set()
501  * and ->commit() CRTC and encoder helper operations, in that order.
502  * Alternatively it can also use the dpms and disable helper operations. For
503  * details see &struct drm_crtc_helper_funcs and struct
504  * &drm_encoder_helper_funcs.
505  *
506  * This function is deprecated.  New drivers must implement atomic modeset
507  * support, for which this function is unsuitable. Instead drivers should use
508  * drm_atomic_helper_set_config().
509  *
510  * Returns:
511  * Returns 0 on success, negative errno numbers on failure.
512  */
513 int drm_crtc_helper_set_config(struct drm_mode_set *set)
514 {
515         struct drm_device *dev;
516         struct drm_crtc **save_encoder_crtcs, *new_crtc;
517         struct drm_encoder **save_connector_encoders, *new_encoder, *encoder;
518         bool mode_changed = false; /* if true do a full mode set */
519         bool fb_changed = false; /* if true and !mode_changed just do a flip */
520         struct drm_connector *connector;
521         struct drm_connector_list_iter conn_iter;
522         int count = 0, ro, fail = 0;
523         const struct drm_crtc_helper_funcs *crtc_funcs;
524         struct drm_mode_set save_set;
525         int ret;
526         int i;
527
528         DRM_DEBUG_KMS("\n");
529
530         BUG_ON(!set);
531         BUG_ON(!set->crtc);
532         BUG_ON(!set->crtc->helper_private);
533
534         /* Enforce sane interface api - has been abused by the fb helper. */
535         BUG_ON(!set->mode && set->fb);
536         BUG_ON(set->fb && set->num_connectors == 0);
537
538         crtc_funcs = set->crtc->helper_private;
539
540         if (!set->mode)
541                 set->fb = NULL;
542
543         if (set->fb) {
544                 DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n",
545                               set->crtc->base.id, set->crtc->name,
546                               set->fb->base.id,
547                               (int)set->num_connectors, set->x, set->y);
548         } else {
549                 DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n",
550                               set->crtc->base.id, set->crtc->name);
551                 drm_crtc_helper_disable(set->crtc);
552                 return 0;
553         }
554
555         dev = set->crtc->dev;
556
557         drm_warn_on_modeset_not_all_locked(dev);
558
559         /*
560          * Allocate space for the backup of all (non-pointer) encoder and
561          * connector data.
562          */
563         save_encoder_crtcs = kzalloc(dev->mode_config.num_encoder *
564                                 sizeof(struct drm_crtc *), GFP_KERNEL);
565         if (!save_encoder_crtcs)
566                 return -ENOMEM;
567
568         save_connector_encoders = kzalloc(dev->mode_config.num_connector *
569                                 sizeof(struct drm_encoder *), GFP_KERNEL);
570         if (!save_connector_encoders) {
571                 kfree(save_encoder_crtcs);
572                 return -ENOMEM;
573         }
574
575         /*
576          * Copy data. Note that driver private data is not affected.
577          * Should anything bad happen only the expected state is
578          * restored, not the drivers personal bookkeeping.
579          */
580         count = 0;
581         drm_for_each_encoder(encoder, dev) {
582                 save_encoder_crtcs[count++] = encoder->crtc;
583         }
584
585         count = 0;
586         drm_connector_list_iter_get(dev, &conn_iter);
587         drm_for_each_connector_iter(connector, &conn_iter)
588                 save_connector_encoders[count++] = connector->encoder;
589         drm_connector_list_iter_put(&conn_iter);
590
591         save_set.crtc = set->crtc;
592         save_set.mode = &set->crtc->mode;
593         save_set.x = set->crtc->x;
594         save_set.y = set->crtc->y;
595         save_set.fb = set->crtc->primary->fb;
596
597         /* We should be able to check here if the fb has the same properties
598          * and then just flip_or_move it */
599         if (set->crtc->primary->fb != set->fb) {
600                 /* If we have no fb then treat it as a full mode set */
601                 if (set->crtc->primary->fb == NULL) {
602                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
603                         mode_changed = true;
604                 } else if (set->fb->format != set->crtc->primary->fb->format) {
605                         mode_changed = true;
606                 } else
607                         fb_changed = true;
608         }
609
610         if (set->x != set->crtc->x || set->y != set->crtc->y)
611                 fb_changed = true;
612
613         if (!drm_mode_equal(set->mode, &set->crtc->mode)) {
614                 DRM_DEBUG_KMS("modes are different, full mode set\n");
615                 drm_mode_debug_printmodeline(&set->crtc->mode);
616                 drm_mode_debug_printmodeline(set->mode);
617                 mode_changed = true;
618         }
619
620         /* take a reference on all unbound connectors in set, reuse the
621          * already taken reference for bound connectors
622          */
623         for (ro = 0; ro < set->num_connectors; ro++) {
624                 if (set->connectors[ro]->encoder)
625                         continue;
626                 drm_connector_reference(set->connectors[ro]);
627         }
628
629         /* a) traverse passed in connector list and get encoders for them */
630         count = 0;
631         drm_connector_list_iter_get(dev, &conn_iter);
632         drm_for_each_connector_iter(connector, &conn_iter) {
633                 const struct drm_connector_helper_funcs *connector_funcs =
634                         connector->helper_private;
635                 new_encoder = connector->encoder;
636                 for (ro = 0; ro < set->num_connectors; ro++) {
637                         if (set->connectors[ro] == connector) {
638                                 new_encoder = connector_funcs->best_encoder(connector);
639                                 /* if we can't get an encoder for a connector
640                                    we are setting now - then fail */
641                                 if (new_encoder == NULL)
642                                         /* don't break so fail path works correct */
643                                         fail = 1;
644
645                                 if (connector->dpms != DRM_MODE_DPMS_ON) {
646                                         DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
647                                         mode_changed = true;
648                                 }
649
650                                 break;
651                         }
652                 }
653
654                 if (new_encoder != connector->encoder) {
655                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
656                         mode_changed = true;
657                         /* If the encoder is reused for another connector, then
658                          * the appropriate crtc will be set later.
659                          */
660                         if (connector->encoder)
661                                 connector->encoder->crtc = NULL;
662                         connector->encoder = new_encoder;
663                 }
664         }
665         drm_connector_list_iter_put(&conn_iter);
666
667         if (fail) {
668                 ret = -EINVAL;
669                 goto fail;
670         }
671
672         count = 0;
673         drm_connector_list_iter_get(dev, &conn_iter);
674         drm_for_each_connector_iter(connector, &conn_iter) {
675                 if (!connector->encoder)
676                         continue;
677
678                 if (connector->encoder->crtc == set->crtc)
679                         new_crtc = NULL;
680                 else
681                         new_crtc = connector->encoder->crtc;
682
683                 for (ro = 0; ro < set->num_connectors; ro++) {
684                         if (set->connectors[ro] == connector)
685                                 new_crtc = set->crtc;
686                 }
687
688                 /* Make sure the new CRTC will work with the encoder */
689                 if (new_crtc &&
690                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
691                         ret = -EINVAL;
692                         drm_connector_list_iter_put(&conn_iter);
693                         goto fail;
694                 }
695                 if (new_crtc != connector->encoder->crtc) {
696                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
697                         mode_changed = true;
698                         connector->encoder->crtc = new_crtc;
699                 }
700                 if (new_crtc) {
701                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n",
702                                       connector->base.id, connector->name,
703                                       new_crtc->base.id, new_crtc->name);
704                 } else {
705                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
706                                       connector->base.id, connector->name);
707                 }
708         }
709         drm_connector_list_iter_put(&conn_iter);
710
711         /* mode_set_base is not a required function */
712         if (fb_changed && !crtc_funcs->mode_set_base)
713                 mode_changed = true;
714
715         if (mode_changed) {
716                 if (drm_helper_crtc_in_use(set->crtc)) {
717                         DRM_DEBUG_KMS("attempting to set mode from"
718                                         " userspace\n");
719                         drm_mode_debug_printmodeline(set->mode);
720                         set->crtc->primary->fb = set->fb;
721                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
722                                                       set->x, set->y,
723                                                       save_set.fb)) {
724                                 DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n",
725                                           set->crtc->base.id, set->crtc->name);
726                                 set->crtc->primary->fb = save_set.fb;
727                                 ret = -EINVAL;
728                                 goto fail;
729                         }
730                         DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
731                         for (i = 0; i < set->num_connectors; i++) {
732                                 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
733                                               set->connectors[i]->name);
734                                 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
735                         }
736                 }
737                 __drm_helper_disable_unused_functions(dev);
738         } else if (fb_changed) {
739                 set->crtc->x = set->x;
740                 set->crtc->y = set->y;
741                 set->crtc->primary->fb = set->fb;
742                 ret = crtc_funcs->mode_set_base(set->crtc,
743                                                 set->x, set->y, save_set.fb);
744                 if (ret != 0) {
745                         set->crtc->x = save_set.x;
746                         set->crtc->y = save_set.y;
747                         set->crtc->primary->fb = save_set.fb;
748                         goto fail;
749                 }
750         }
751
752         kfree(save_connector_encoders);
753         kfree(save_encoder_crtcs);
754         return 0;
755
756 fail:
757         /* Restore all previous data. */
758         count = 0;
759         drm_for_each_encoder(encoder, dev) {
760                 encoder->crtc = save_encoder_crtcs[count++];
761         }
762
763         count = 0;
764         drm_connector_list_iter_get(dev, &conn_iter);
765         drm_for_each_connector_iter(connector, &conn_iter)
766                 connector->encoder = save_connector_encoders[count++];
767         drm_connector_list_iter_put(&conn_iter);
768
769         /* after fail drop reference on all unbound connectors in set, let
770          * bound connectors keep their reference
771          */
772         for (ro = 0; ro < set->num_connectors; ro++) {
773                 if (set->connectors[ro]->encoder)
774                         continue;
775                 drm_connector_unreference(set->connectors[ro]);
776         }
777
778         /* Try to restore the config */
779         if (mode_changed &&
780             !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
781                                       save_set.y, save_set.fb))
782                 DRM_ERROR("failed to restore config after modeset failure\n");
783
784         kfree(save_connector_encoders);
785         kfree(save_encoder_crtcs);
786         return ret;
787 }
788 EXPORT_SYMBOL(drm_crtc_helper_set_config);
789
790 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
791 {
792         int dpms = DRM_MODE_DPMS_OFF;
793         struct drm_connector *connector;
794         struct drm_connector_list_iter conn_iter;
795         struct drm_device *dev = encoder->dev;
796
797         drm_connector_list_iter_get(dev, &conn_iter);
798         drm_for_each_connector_iter(connector, &conn_iter)
799                 if (connector->encoder == encoder)
800                         if (connector->dpms < dpms)
801                                 dpms = connector->dpms;
802         drm_connector_list_iter_put(&conn_iter);
803
804         return dpms;
805 }
806
807 /* Helper which handles bridge ordering around encoder dpms */
808 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
809 {
810         struct drm_bridge *bridge = encoder->bridge;
811         const struct drm_encoder_helper_funcs *encoder_funcs;
812
813         encoder_funcs = encoder->helper_private;
814         if (!encoder_funcs)
815                 return;
816
817         if (mode == DRM_MODE_DPMS_ON)
818                 drm_bridge_pre_enable(bridge);
819         else
820                 drm_bridge_disable(bridge);
821
822         if (encoder_funcs->dpms)
823                 encoder_funcs->dpms(encoder, mode);
824
825         if (mode == DRM_MODE_DPMS_ON)
826                 drm_bridge_enable(bridge);
827         else
828                 drm_bridge_post_disable(bridge);
829 }
830
831 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
832 {
833         int dpms = DRM_MODE_DPMS_OFF;
834         struct drm_connector *connector;
835         struct drm_connector_list_iter conn_iter;
836         struct drm_device *dev = crtc->dev;
837
838         drm_connector_list_iter_get(dev, &conn_iter);
839         drm_for_each_connector_iter(connector, &conn_iter)
840                 if (connector->encoder && connector->encoder->crtc == crtc)
841                         if (connector->dpms < dpms)
842                                 dpms = connector->dpms;
843         drm_connector_list_iter_put(&conn_iter);
844
845         return dpms;
846 }
847
848 /**
849  * drm_helper_connector_dpms() - connector dpms helper implementation
850  * @connector: affected connector
851  * @mode: DPMS mode
852  *
853  * The drm_helper_connector_dpms() helper function implements the
854  * &drm_connector_funcs.dpms callback for drivers using the legacy CRTC
855  * helpers.
856  *
857  * This is the main helper function provided by the CRTC helper framework for
858  * implementing the DPMS connector attribute. It computes the new desired DPMS
859  * state for all encoders and CRTCs in the output mesh and calls the
860  * &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks
861  * provided by the driver.
862  *
863  * This function is deprecated.  New drivers must implement atomic modeset
864  * support, for which this function is unsuitable. Instead drivers should use
865  * drm_atomic_helper_connector_dpms().
866  *
867  * Returns:
868  * Always returns 0.
869  */
870 int drm_helper_connector_dpms(struct drm_connector *connector, int mode)
871 {
872         struct drm_encoder *encoder = connector->encoder;
873         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
874         int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
875
876         if (mode == connector->dpms)
877                 return 0;
878
879         old_dpms = connector->dpms;
880         connector->dpms = mode;
881
882         if (encoder)
883                 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
884
885         /* from off to on, do crtc then encoder */
886         if (mode < old_dpms) {
887                 if (crtc) {
888                         const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
889                         if (crtc_funcs->dpms)
890                                 (*crtc_funcs->dpms) (crtc,
891                                                      drm_helper_choose_crtc_dpms(crtc));
892                 }
893                 if (encoder)
894                         drm_helper_encoder_dpms(encoder, encoder_dpms);
895         }
896
897         /* from on to off, do encoder then crtc */
898         if (mode > old_dpms) {
899                 if (encoder)
900                         drm_helper_encoder_dpms(encoder, encoder_dpms);
901                 if (crtc) {
902                         const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
903                         if (crtc_funcs->dpms)
904                                 (*crtc_funcs->dpms) (crtc,
905                                                      drm_helper_choose_crtc_dpms(crtc));
906                 }
907         }
908
909         return 0;
910 }
911 EXPORT_SYMBOL(drm_helper_connector_dpms);
912
913 /**
914  * drm_helper_resume_force_mode - force-restore mode setting configuration
915  * @dev: drm_device which should be restored
916  *
917  * Drivers which use the mode setting helpers can use this function to
918  * force-restore the mode setting configuration e.g. on resume or when something
919  * else might have trampled over the hw state (like some overzealous old BIOSen
920  * tended to do).
921  *
922  * This helper doesn't provide a error return value since restoring the old
923  * config should never fail due to resource allocation issues since the driver
924  * has successfully set the restored configuration already. Hence this should
925  * boil down to the equivalent of a few dpms on calls, which also don't provide
926  * an error code.
927  *
928  * Drivers where simply restoring an old configuration again might fail (e.g.
929  * due to slight differences in allocating shared resources when the
930  * configuration is restored in a different order than when userspace set it up)
931  * need to use their own restore logic.
932  *
933  * This function is deprecated. New drivers should implement atomic mode-
934  * setting and use the atomic suspend/resume helpers.
935  *
936  * See also:
937  * drm_atomic_helper_suspend(), drm_atomic_helper_resume()
938  */
939 void drm_helper_resume_force_mode(struct drm_device *dev)
940 {
941         struct drm_crtc *crtc;
942         struct drm_encoder *encoder;
943         const struct drm_crtc_helper_funcs *crtc_funcs;
944         int encoder_dpms;
945         bool ret;
946
947         drm_modeset_lock_all(dev);
948         drm_for_each_crtc(crtc, dev) {
949
950                 if (!crtc->enabled)
951                         continue;
952
953                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
954                                                crtc->x, crtc->y, crtc->primary->fb);
955
956                 /* Restoring the old config should never fail! */
957                 if (ret == false)
958                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
959
960                 /* Turn off outputs that were already powered off */
961                 if (drm_helper_choose_crtc_dpms(crtc)) {
962                         drm_for_each_encoder(encoder, dev) {
963
964                                 if(encoder->crtc != crtc)
965                                         continue;
966
967                                 encoder_dpms = drm_helper_choose_encoder_dpms(
968                                                         encoder);
969
970                                 drm_helper_encoder_dpms(encoder, encoder_dpms);
971                         }
972
973                         crtc_funcs = crtc->helper_private;
974                         if (crtc_funcs->dpms)
975                                 (*crtc_funcs->dpms) (crtc,
976                                                      drm_helper_choose_crtc_dpms(crtc));
977                 }
978         }
979
980         /* disable the unused connectors while restoring the modesetting */
981         __drm_helper_disable_unused_functions(dev);
982         drm_modeset_unlock_all(dev);
983 }
984 EXPORT_SYMBOL(drm_helper_resume_force_mode);
985
986 /**
987  * drm_helper_crtc_mode_set - mode_set implementation for atomic plane helpers
988  * @crtc: DRM CRTC
989  * @mode: DRM display mode which userspace requested
990  * @adjusted_mode: DRM display mode adjusted by ->mode_fixup callbacks
991  * @x: x offset of the CRTC scanout area on the underlying framebuffer
992  * @y: y offset of the CRTC scanout area on the underlying framebuffer
993  * @old_fb: previous framebuffer
994  *
995  * This function implements a callback useable as the ->mode_set callback
996  * required by the CRTC helpers. Besides the atomic plane helper functions for
997  * the primary plane the driver must also provide the ->mode_set_nofb callback
998  * to set up the CRTC.
999  *
1000  * This is a transitional helper useful for converting drivers to the atomic
1001  * interfaces.
1002  */
1003 int drm_helper_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
1004                              struct drm_display_mode *adjusted_mode, int x, int y,
1005                              struct drm_framebuffer *old_fb)
1006 {
1007         struct drm_crtc_state *crtc_state;
1008         const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
1009         int ret;
1010
1011         if (crtc->funcs->atomic_duplicate_state)
1012                 crtc_state = crtc->funcs->atomic_duplicate_state(crtc);
1013         else {
1014                 if (!crtc->state)
1015                         drm_atomic_helper_crtc_reset(crtc);
1016
1017                 crtc_state = drm_atomic_helper_crtc_duplicate_state(crtc);
1018         }
1019
1020         if (!crtc_state)
1021                 return -ENOMEM;
1022
1023         crtc_state->planes_changed = true;
1024         crtc_state->mode_changed = true;
1025         ret = drm_atomic_set_mode_for_crtc(crtc_state, mode);
1026         if (ret)
1027                 goto out;
1028         drm_mode_copy(&crtc_state->adjusted_mode, adjusted_mode);
1029
1030         if (crtc_funcs->atomic_check) {
1031                 ret = crtc_funcs->atomic_check(crtc, crtc_state);
1032                 if (ret)
1033                         goto out;
1034         }
1035
1036         swap(crtc->state, crtc_state);
1037
1038         crtc_funcs->mode_set_nofb(crtc);
1039
1040         ret = drm_helper_crtc_mode_set_base(crtc, x, y, old_fb);
1041
1042 out:
1043         if (crtc_state) {
1044                 if (crtc->funcs->atomic_destroy_state)
1045                         crtc->funcs->atomic_destroy_state(crtc, crtc_state);
1046                 else
1047                         drm_atomic_helper_crtc_destroy_state(crtc, crtc_state);
1048         }
1049
1050         return ret;
1051 }
1052 EXPORT_SYMBOL(drm_helper_crtc_mode_set);
1053
1054 /**
1055  * drm_helper_crtc_mode_set_base - mode_set_base implementation for atomic plane helpers
1056  * @crtc: DRM CRTC
1057  * @x: x offset of the CRTC scanout area on the underlying framebuffer
1058  * @y: y offset of the CRTC scanout area on the underlying framebuffer
1059  * @old_fb: previous framebuffer
1060  *
1061  * This function implements a callback useable as the ->mode_set_base used
1062  * required by the CRTC helpers. The driver must provide the atomic plane helper
1063  * functions for the primary plane.
1064  *
1065  * This is a transitional helper useful for converting drivers to the atomic
1066  * interfaces.
1067  */
1068 int drm_helper_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
1069                                   struct drm_framebuffer *old_fb)
1070 {
1071         struct drm_plane_state *plane_state;
1072         struct drm_plane *plane = crtc->primary;
1073
1074         if (plane->funcs->atomic_duplicate_state)
1075                 plane_state = plane->funcs->atomic_duplicate_state(plane);
1076         else {
1077                 if (!plane->state)
1078                         drm_atomic_helper_plane_reset(plane);
1079
1080                 plane_state = drm_atomic_helper_plane_duplicate_state(plane);
1081         }
1082         if (!plane_state)
1083                 return -ENOMEM;
1084         plane_state->plane = plane;
1085
1086         plane_state->crtc = crtc;
1087         drm_atomic_set_fb_for_plane(plane_state, crtc->primary->fb);
1088         plane_state->crtc_x = 0;
1089         plane_state->crtc_y = 0;
1090         plane_state->crtc_h = crtc->mode.vdisplay;
1091         plane_state->crtc_w = crtc->mode.hdisplay;
1092         plane_state->src_x = x << 16;
1093         plane_state->src_y = y << 16;
1094         plane_state->src_h = crtc->mode.vdisplay << 16;
1095         plane_state->src_w = crtc->mode.hdisplay << 16;
1096
1097         return drm_plane_helper_commit(plane, plane_state, old_fb);
1098 }
1099 EXPORT_SYMBOL(drm_helper_crtc_mode_set_base);