]> nv-tegra.nvidia Code Review - linux-2.6.git/blob - drivers/gpu/drm/drm_crtc_helper.c
drm: Hook up DPMS property handling in drm_crtc.c. Add drm_helper_connector_dpms.
[linux-2.6.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 "drmP.h"
33 #include "drm_crtc.h"
34 #include "drm_crtc_helper.h"
35
36 /*
37  * Detailed mode info for 800x600@60Hz
38  */
39 static struct drm_display_mode std_modes[] = {
40         { DRM_MODE("800x600", DRM_MODE_TYPE_DEFAULT, 40000, 800, 840,
41                    968, 1056, 0, 600, 601, 605, 628, 0,
42                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
43 };
44
45 static void drm_mode_validate_flag(struct drm_connector *connector,
46                                    int flags)
47 {
48         struct drm_display_mode *mode, *t;
49
50         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
51                 return;
52
53         list_for_each_entry_safe(mode, t, &connector->modes, head) {
54                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
55                                 !(flags & DRM_MODE_FLAG_INTERLACE))
56                         mode->status = MODE_NO_INTERLACE;
57                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
58                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
59                         mode->status = MODE_NO_DBLESCAN;
60         }
61
62         return;
63 }
64
65 /**
66  * drm_helper_probe_connector_modes - get complete set of display modes
67  * @dev: DRM device
68  * @maxX: max width for modes
69  * @maxY: max height for modes
70  *
71  * LOCKING:
72  * Caller must hold mode config lock.
73  *
74  * Based on @dev's mode_config layout, scan all the connectors and try to detect
75  * modes on them.  Modes will first be added to the connector's probed_modes
76  * list, then culled (based on validity and the @maxX, @maxY parameters) and
77  * put into the normal modes list.
78  *
79  * Intended to be used either at bootup time or when major configuration
80  * changes have occurred.
81  *
82  * FIXME: take into account monitor limits
83  *
84  * RETURNS:
85  * Number of modes found on @connector.
86  */
87 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
88                                             uint32_t maxX, uint32_t maxY)
89 {
90         struct drm_device *dev = connector->dev;
91         struct drm_display_mode *mode, *t;
92         struct drm_connector_helper_funcs *connector_funcs =
93                 connector->helper_private;
94         int count = 0;
95         int mode_flags = 0;
96
97         DRM_DEBUG("%s\n", drm_get_connector_name(connector));
98         /* set all modes to the unverified state */
99         list_for_each_entry_safe(mode, t, &connector->modes, head)
100                 mode->status = MODE_UNVERIFIED;
101
102         connector->status = connector->funcs->detect(connector);
103
104         if (connector->status == connector_status_disconnected) {
105                 DRM_DEBUG("%s is disconnected\n",
106                           drm_get_connector_name(connector));
107                 /* TODO set EDID to NULL */
108                 return 0;
109         }
110
111         count = (*connector_funcs->get_modes)(connector);
112         if (!count)
113                 return 0;
114
115         drm_mode_connector_list_update(connector);
116
117         if (maxX && maxY)
118                 drm_mode_validate_size(dev, &connector->modes, maxX,
119                                        maxY, 0);
120
121         if (connector->interlace_allowed)
122                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
123         if (connector->doublescan_allowed)
124                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
125         drm_mode_validate_flag(connector, mode_flags);
126
127         list_for_each_entry_safe(mode, t, &connector->modes, head) {
128                 if (mode->status == MODE_OK)
129                         mode->status = connector_funcs->mode_valid(connector,
130                                                                    mode);
131         }
132
133
134         drm_mode_prune_invalid(dev, &connector->modes, true);
135
136         if (list_empty(&connector->modes))
137                 return 0;
138
139         drm_mode_sort(&connector->modes);
140
141         DRM_DEBUG("Probed modes for %s\n", drm_get_connector_name(connector));
142         list_for_each_entry_safe(mode, t, &connector->modes, head) {
143                 mode->vrefresh = drm_mode_vrefresh(mode);
144
145                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
146                 drm_mode_debug_printmodeline(mode);
147         }
148
149         return count;
150 }
151 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
152
153 int drm_helper_probe_connector_modes(struct drm_device *dev, uint32_t maxX,
154                                       uint32_t maxY)
155 {
156         struct drm_connector *connector;
157         int count = 0;
158
159         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
160                 count += drm_helper_probe_single_connector_modes(connector,
161                                                                  maxX, maxY);
162         }
163
164         return count;
165 }
166 EXPORT_SYMBOL(drm_helper_probe_connector_modes);
167
168 static void drm_helper_add_std_modes(struct drm_device *dev,
169                                      struct drm_connector *connector)
170 {
171         struct drm_display_mode *mode, *t;
172         int i;
173
174         for (i = 0; i < ARRAY_SIZE(std_modes); i++) {
175                 struct drm_display_mode *stdmode;
176
177                 /*
178                  * When no valid EDID modes are available we end up
179                  * here and bailed in the past, now we add some standard
180                  * modes and move on.
181                  */
182                 stdmode = drm_mode_duplicate(dev, &std_modes[i]);
183                 drm_mode_probed_add(connector, stdmode);
184                 drm_mode_list_concat(&connector->probed_modes,
185                                      &connector->modes);
186
187                 DRM_DEBUG("Adding mode %s to %s\n", stdmode->name,
188                           drm_get_connector_name(connector));
189         }
190         drm_mode_sort(&connector->modes);
191
192         DRM_DEBUG("Added std modes on %s\n", drm_get_connector_name(connector));
193         list_for_each_entry_safe(mode, t, &connector->modes, head) {
194                 mode->vrefresh = drm_mode_vrefresh(mode);
195
196                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
197                 drm_mode_debug_printmodeline(mode);
198         }
199 }
200
201 /**
202  * drm_helper_encoder_in_use - check if a given encoder is in use
203  * @encoder: encoder to check
204  *
205  * LOCKING:
206  * Caller must hold mode config lock.
207  *
208  * Walk @encoders's DRM device's mode_config and see if it's in use.
209  *
210  * RETURNS:
211  * True if @encoder is part of the mode_config, false otherwise.
212  */
213 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
214 {
215         struct drm_connector *connector;
216         struct drm_device *dev = encoder->dev;
217         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
218                 if (connector->encoder == encoder)
219                         return true;
220         return false;
221 }
222 EXPORT_SYMBOL(drm_helper_encoder_in_use);
223
224 /**
225  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
226  * @crtc: CRTC to check
227  *
228  * LOCKING:
229  * Caller must hold mode config lock.
230  *
231  * Walk @crtc's DRM device's mode_config and see if it's in use.
232  *
233  * RETURNS:
234  * True if @crtc is part of the mode_config, false otherwise.
235  */
236 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
237 {
238         struct drm_encoder *encoder;
239         struct drm_device *dev = crtc->dev;
240         /* FIXME: Locking around list access? */
241         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
242                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
243                         return true;
244         return false;
245 }
246 EXPORT_SYMBOL(drm_helper_crtc_in_use);
247
248 /**
249  * drm_disable_unused_functions - disable unused objects
250  * @dev: DRM device
251  *
252  * LOCKING:
253  * Caller must hold mode config lock.
254  *
255  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
256  * by calling its dpms function, which should power it off.
257  */
258 void drm_helper_disable_unused_functions(struct drm_device *dev)
259 {
260         struct drm_encoder *encoder;
261         struct drm_encoder_helper_funcs *encoder_funcs;
262         struct drm_crtc *crtc;
263
264         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
265                 encoder_funcs = encoder->helper_private;
266                 if (!drm_helper_encoder_in_use(encoder))
267                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
268         }
269
270         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
271                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
272                 crtc->enabled = drm_helper_crtc_in_use(crtc);
273                 if (!crtc->enabled) {
274                         crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
275                         crtc->fb = NULL;
276                 }
277         }
278 }
279 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
280
281 static struct drm_display_mode *drm_has_preferred_mode(struct drm_connector *connector, int width, int height)
282 {
283         struct drm_display_mode *mode;
284
285         list_for_each_entry(mode, &connector->modes, head) {
286                 if (drm_mode_width(mode) > width ||
287                     drm_mode_height(mode) > height)
288                         continue;
289                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
290                         return mode;
291         }
292         return NULL;
293 }
294
295 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
296 {
297         bool enable;
298
299         if (strict) {
300                 enable = connector->status == connector_status_connected;
301         } else {
302                 enable = connector->status != connector_status_disconnected;
303         }
304         return enable;
305 }
306
307 static void drm_enable_connectors(struct drm_device *dev, bool *enabled)
308 {
309         bool any_enabled = false;
310         struct drm_connector *connector;
311         int i = 0;
312
313         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
314                 enabled[i] = drm_connector_enabled(connector, true);
315                 DRM_DEBUG("connector %d enabled? %s\n", connector->base.id,
316                           enabled[i] ? "yes" : "no");
317                 any_enabled |= enabled[i];
318                 i++;
319         }
320
321         if (any_enabled)
322                 return;
323
324         i = 0;
325         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
326                 enabled[i] = drm_connector_enabled(connector, false);
327                 i++;
328         }
329 }
330
331 static bool drm_target_preferred(struct drm_device *dev,
332                                  struct drm_display_mode **modes,
333                                  bool *enabled, int width, int height)
334 {
335         struct drm_connector *connector;
336         int i = 0;
337
338         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
339
340                 if (enabled[i] == false) {
341                         i++;
342                         continue;
343                 }
344
345                 DRM_DEBUG("looking for preferred mode on connector %d\n",
346                           connector->base.id);
347
348                 modes[i] = drm_has_preferred_mode(connector, width, height);
349                 /* No preferred modes, pick one off the list */
350                 if (!modes[i] && !list_empty(&connector->modes)) {
351                         list_for_each_entry(modes[i], &connector->modes, head)
352                                 break;
353                 }
354                 DRM_DEBUG("found mode %s\n", modes[i] ? modes[i]->name :
355                           "none");
356                 i++;
357         }
358         return true;
359 }
360
361 static int drm_pick_crtcs(struct drm_device *dev,
362                           struct drm_crtc **best_crtcs,
363                           struct drm_display_mode **modes,
364                           int n, int width, int height)
365 {
366         int c, o;
367         struct drm_connector *connector;
368         struct drm_connector_helper_funcs *connector_funcs;
369         struct drm_encoder *encoder;
370         struct drm_crtc *best_crtc;
371         int my_score, best_score, score;
372         struct drm_crtc **crtcs, *crtc;
373
374         if (n == dev->mode_config.num_connector)
375                 return 0;
376         c = 0;
377         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
378                 if (c == n)
379                         break;
380                 c++;
381         }
382
383         best_crtcs[n] = NULL;
384         best_crtc = NULL;
385         best_score = drm_pick_crtcs(dev, best_crtcs, modes, n+1, width, height);
386         if (modes[n] == NULL)
387                 return best_score;
388
389         crtcs = kmalloc(dev->mode_config.num_connector *
390                         sizeof(struct drm_crtc *), GFP_KERNEL);
391         if (!crtcs)
392                 return best_score;
393
394         my_score = 1;
395         if (connector->status == connector_status_connected)
396                 my_score++;
397         if (drm_has_preferred_mode(connector, width, height))
398                 my_score++;
399
400         connector_funcs = connector->helper_private;
401         encoder = connector_funcs->best_encoder(connector);
402         if (!encoder)
403                 goto out;
404
405         connector->encoder = encoder;
406
407         /* select a crtc for this connector and then attempt to configure
408            remaining connectors */
409         c = 0;
410         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
411
412                 if ((connector->encoder->possible_crtcs & (1 << c)) == 0) {
413                         c++;
414                         continue;
415                 }
416
417                 for (o = 0; o < n; o++)
418                         if (best_crtcs[o] == crtc)
419                                 break;
420
421                 if (o < n) {
422                         /* ignore cloning for now */
423                         c++;
424                         continue;
425                 }
426
427                 crtcs[n] = crtc;
428                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_crtc *));
429                 score = my_score + drm_pick_crtcs(dev, crtcs, modes, n + 1,
430                                                   width, height);
431                 if (score > best_score) {
432                         best_crtc = crtc;
433                         best_score = score;
434                         memcpy(best_crtcs, crtcs,
435                                dev->mode_config.num_connector *
436                                sizeof(struct drm_crtc *));
437                 }
438                 c++;
439         }
440 out:
441         kfree(crtcs);
442         return best_score;
443 }
444
445 static void drm_setup_crtcs(struct drm_device *dev)
446 {
447         struct drm_crtc **crtcs;
448         struct drm_display_mode **modes;
449         struct drm_encoder *encoder;
450         struct drm_connector *connector;
451         bool *enabled;
452         int width, height;
453         int i, ret;
454
455         DRM_DEBUG("\n");
456
457         width = dev->mode_config.max_width;
458         height = dev->mode_config.max_height;
459
460         /* clean out all the encoder/crtc combos */
461         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
462                 encoder->crtc = NULL;
463         }
464
465         crtcs = kcalloc(dev->mode_config.num_connector,
466                         sizeof(struct drm_crtc *), GFP_KERNEL);
467         modes = kcalloc(dev->mode_config.num_connector,
468                         sizeof(struct drm_display_mode *), GFP_KERNEL);
469         enabled = kcalloc(dev->mode_config.num_connector,
470                           sizeof(bool), GFP_KERNEL);
471
472         drm_enable_connectors(dev, enabled);
473
474         ret = drm_target_preferred(dev, modes, enabled, width, height);
475         if (!ret)
476                 DRM_ERROR("Unable to find initial modes\n");
477
478         DRM_DEBUG("picking CRTCs for %dx%d config\n", width, height);
479
480         drm_pick_crtcs(dev, crtcs, modes, 0, width, height);
481
482         i = 0;
483         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
484                 struct drm_display_mode *mode = modes[i];
485                 struct drm_crtc *crtc = crtcs[i];
486
487                 if (connector->encoder == NULL) {
488                         i++;
489                         continue;
490                 }
491
492                 if (mode && crtc) {
493                         DRM_DEBUG("desired mode %s set on crtc %d\n",
494                                   mode->name, crtc->base.id);
495                         crtc->desired_mode = mode;
496                         connector->encoder->crtc = crtc;
497                 } else
498                         connector->encoder->crtc = NULL;
499                 i++;
500         }
501
502         kfree(crtcs);
503         kfree(modes);
504         kfree(enabled);
505 }
506
507 /**
508  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
509  * @encoder: encoder to test
510  * @crtc: crtc to test
511  *
512  * Return false if @encoder can't be driven by @crtc, true otherwise.
513  */
514 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
515                                 struct drm_crtc *crtc)
516 {
517         struct drm_device *dev;
518         struct drm_crtc *tmp;
519         int crtc_mask = 1;
520
521         WARN(!crtc, "checking null crtc?");
522
523         dev = crtc->dev;
524
525         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
526                 if (tmp == crtc)
527                         break;
528                 crtc_mask <<= 1;
529         }
530
531         if (encoder->possible_crtcs & crtc_mask)
532                 return true;
533         return false;
534 }
535
536 /*
537  * Check the CRTC we're going to map each output to vs. its current
538  * CRTC.  If they don't match, we have to disable the output and the CRTC
539  * since the driver will have to re-route things.
540  */
541 static void
542 drm_crtc_prepare_encoders(struct drm_device *dev)
543 {
544         struct drm_encoder_helper_funcs *encoder_funcs;
545         struct drm_encoder *encoder;
546
547         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
548                 encoder_funcs = encoder->helper_private;
549                 /* Disable unused encoders */
550                 if (encoder->crtc == NULL)
551                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
552                 /* Disable encoders whose CRTC is about to change */
553                 if (encoder_funcs->get_crtc &&
554                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
555                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
556         }
557 }
558
559 /**
560  * drm_crtc_set_mode - set a mode
561  * @crtc: CRTC to program
562  * @mode: mode to use
563  * @x: width of mode
564  * @y: height of mode
565  *
566  * LOCKING:
567  * Caller must hold mode config lock.
568  *
569  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
570  * to fixup or reject the mode prior to trying to set it.
571  *
572  * RETURNS:
573  * True if the mode was set successfully, or false otherwise.
574  */
575 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
576                               struct drm_display_mode *mode,
577                               int x, int y,
578                               struct drm_framebuffer *old_fb)
579 {
580         struct drm_device *dev = crtc->dev;
581         struct drm_display_mode *adjusted_mode, saved_mode;
582         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
583         struct drm_encoder_helper_funcs *encoder_funcs;
584         int saved_x, saved_y;
585         struct drm_encoder *encoder;
586         bool ret = true;
587
588         adjusted_mode = drm_mode_duplicate(dev, mode);
589
590         crtc->enabled = drm_helper_crtc_in_use(crtc);
591
592         if (!crtc->enabled)
593                 return true;
594
595         saved_mode = crtc->mode;
596         saved_x = crtc->x;
597         saved_y = crtc->y;
598
599         /* Update crtc values up front so the driver can rely on them for mode
600          * setting.
601          */
602         crtc->mode = *mode;
603         crtc->x = x;
604         crtc->y = y;
605
606         /* Pass our mode to the connectors and the CRTC to give them a chance to
607          * adjust it according to limitations or connector properties, and also
608          * a chance to reject the mode entirely.
609          */
610         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
611
612                 if (encoder->crtc != crtc)
613                         continue;
614                 encoder_funcs = encoder->helper_private;
615                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
616                                                       adjusted_mode))) {
617                         goto done;
618                 }
619         }
620
621         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
622                 goto done;
623         }
624
625         /* Prepare the encoders and CRTCs before setting the mode. */
626         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
627
628                 if (encoder->crtc != crtc)
629                         continue;
630                 encoder_funcs = encoder->helper_private;
631                 /* Disable the encoders as the first thing we do. */
632                 encoder_funcs->prepare(encoder);
633         }
634
635         drm_crtc_prepare_encoders(dev);
636
637         crtc_funcs->prepare(crtc);
638
639         /* Set up the DPLL and any encoders state that needs to adjust or depend
640          * on the DPLL.
641          */
642         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
643         if (!ret)
644             goto done;
645
646         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
647
648                 if (encoder->crtc != crtc)
649                         continue;
650
651                 DRM_INFO("%s: set mode %s %x\n", drm_get_encoder_name(encoder),
652                          mode->name, mode->base.id);
653                 encoder_funcs = encoder->helper_private;
654                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
655         }
656
657         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
658         crtc_funcs->commit(crtc);
659
660         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
661
662                 if (encoder->crtc != crtc)
663                         continue;
664
665                 encoder_funcs = encoder->helper_private;
666                 encoder_funcs->commit(encoder);
667
668         }
669
670         /* XXX free adjustedmode */
671         drm_mode_destroy(dev, adjusted_mode);
672         /* FIXME: add subpixel order */
673 done:
674         if (!ret) {
675                 crtc->mode = saved_mode;
676                 crtc->x = saved_x;
677                 crtc->y = saved_y;
678         }
679
680         return ret;
681 }
682 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
683
684
685 /**
686  * drm_crtc_helper_set_config - set a new config from userspace
687  * @crtc: CRTC to setup
688  * @crtc_info: user provided configuration
689  * @new_mode: new mode to set
690  * @connector_set: set of connectors for the new config
691  * @fb: new framebuffer
692  *
693  * LOCKING:
694  * Caller must hold mode config lock.
695  *
696  * Setup a new configuration, provided by the user in @crtc_info, and enable
697  * it.
698  *
699  * RETURNS:
700  * Zero. (FIXME)
701  */
702 int drm_crtc_helper_set_config(struct drm_mode_set *set)
703 {
704         struct drm_device *dev;
705         struct drm_crtc **save_crtcs, *new_crtc;
706         struct drm_encoder **save_encoders, *new_encoder;
707         struct drm_framebuffer *old_fb = NULL;
708         bool save_enabled;
709         bool mode_changed = false;
710         bool fb_changed = false;
711         struct drm_connector *connector;
712         int count = 0, ro, fail = 0;
713         struct drm_crtc_helper_funcs *crtc_funcs;
714         int ret = 0;
715
716         DRM_DEBUG("\n");
717
718         if (!set)
719                 return -EINVAL;
720
721         if (!set->crtc)
722                 return -EINVAL;
723
724         if (!set->crtc->helper_private)
725                 return -EINVAL;
726
727         crtc_funcs = set->crtc->helper_private;
728
729         DRM_DEBUG("crtc: %p %d fb: %p connectors: %p num_connectors: %d (x, y) (%i, %i)\n",
730                   set->crtc, set->crtc->base.id, set->fb, set->connectors,
731                   (int)set->num_connectors, set->x, set->y);
732
733         dev = set->crtc->dev;
734
735         /* save previous config */
736         save_enabled = set->crtc->enabled;
737
738         /*
739          * We do mode_config.num_connectors here since we'll look at the
740          * CRTC and encoder associated with each connector later.
741          */
742         save_crtcs = kzalloc(dev->mode_config.num_connector *
743                              sizeof(struct drm_crtc *), GFP_KERNEL);
744         if (!save_crtcs)
745                 return -ENOMEM;
746
747         save_encoders = kzalloc(dev->mode_config.num_connector *
748                                 sizeof(struct drm_encoders *), GFP_KERNEL);
749         if (!save_encoders) {
750                 kfree(save_crtcs);
751                 return -ENOMEM;
752         }
753
754         /* We should be able to check here if the fb has the same properties
755          * and then just flip_or_move it */
756         if (set->crtc->fb != set->fb) {
757                 /* If we have no fb then treat it as a full mode set */
758                 if (set->crtc->fb == NULL) {
759                         DRM_DEBUG("crtc has no fb, full mode set\n");
760                         mode_changed = true;
761                 } else if ((set->fb->bits_per_pixel !=
762                          set->crtc->fb->bits_per_pixel) ||
763                          set->fb->depth != set->crtc->fb->depth)
764                         fb_changed = true;
765                 else
766                         fb_changed = true;
767         }
768
769         if (set->x != set->crtc->x || set->y != set->crtc->y)
770                 fb_changed = true;
771
772         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
773                 DRM_DEBUG("modes are different, full mode set\n");
774                 drm_mode_debug_printmodeline(&set->crtc->mode);
775                 drm_mode_debug_printmodeline(set->mode);
776                 mode_changed = true;
777         }
778
779         /* a) traverse passed in connector list and get encoders for them */
780         count = 0;
781         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
782                 struct drm_connector_helper_funcs *connector_funcs =
783                         connector->helper_private;
784                 save_encoders[count++] = connector->encoder;
785                 new_encoder = connector->encoder;
786                 for (ro = 0; ro < set->num_connectors; ro++) {
787                         if (set->connectors[ro] == connector) {
788                                 new_encoder = connector_funcs->best_encoder(connector);
789                                 /* if we can't get an encoder for a connector
790                                    we are setting now - then fail */
791                                 if (new_encoder == NULL)
792                                         /* don't break so fail path works correct */
793                                         fail = 1;
794                                 break;
795                         }
796                 }
797
798                 if (new_encoder != connector->encoder) {
799                         DRM_DEBUG("encoder changed, full mode switch\n");
800                         mode_changed = true;
801                         connector->encoder = new_encoder;
802                 }
803         }
804
805         if (fail) {
806                 ret = -EINVAL;
807                 goto fail_no_encoder;
808         }
809
810         count = 0;
811         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
812                 if (!connector->encoder)
813                         continue;
814
815                 save_crtcs[count++] = connector->encoder->crtc;
816
817                 if (connector->encoder->crtc == set->crtc)
818                         new_crtc = NULL;
819                 else
820                         new_crtc = connector->encoder->crtc;
821
822                 for (ro = 0; ro < set->num_connectors; ro++) {
823                         if (set->connectors[ro] == connector)
824                                 new_crtc = set->crtc;
825                 }
826
827                 /* Make sure the new CRTC will work with the encoder */
828                 if (new_crtc &&
829                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
830                         ret = -EINVAL;
831                         goto fail_set_mode;
832                 }
833                 if (new_crtc != connector->encoder->crtc) {
834                         DRM_DEBUG("crtc changed, full mode switch\n");
835                         mode_changed = true;
836                         connector->encoder->crtc = new_crtc;
837                 }
838                 DRM_DEBUG("setting connector %d crtc to %p\n",
839                           connector->base.id, new_crtc);
840         }
841
842         /* mode_set_base is not a required function */
843         if (fb_changed && !crtc_funcs->mode_set_base)
844                 mode_changed = true;
845
846         if (mode_changed) {
847                 old_fb = set->crtc->fb;
848                 set->crtc->fb = set->fb;
849                 set->crtc->enabled = (set->mode != NULL);
850                 if (set->mode != NULL) {
851                         DRM_DEBUG("attempting to set mode from userspace\n");
852                         drm_mode_debug_printmodeline(set->mode);
853                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
854                                                       set->x, set->y,
855                                                       old_fb)) {
856                                 DRM_ERROR("failed to set mode on crtc %p\n",
857                                           set->crtc);
858                                 ret = -EINVAL;
859                                 goto fail_set_mode;
860                         }
861                         /* TODO are these needed? */
862                         set->crtc->desired_x = set->x;
863                         set->crtc->desired_y = set->y;
864                         set->crtc->desired_mode = set->mode;
865                 }
866                 drm_helper_disable_unused_functions(dev);
867         } else if (fb_changed) {
868                 old_fb = set->crtc->fb;
869                 if (set->crtc->fb != set->fb)
870                         set->crtc->fb = set->fb;
871                 ret = crtc_funcs->mode_set_base(set->crtc,
872                                                 set->x, set->y, old_fb);
873                 if (ret != 0)
874                     goto fail_set_mode;
875         }
876
877         kfree(save_encoders);
878         kfree(save_crtcs);
879         return 0;
880
881 fail_set_mode:
882         set->crtc->enabled = save_enabled;
883         set->crtc->fb = old_fb;
884         count = 0;
885         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
886                 if (!connector->encoder)
887                         continue;
888
889                 connector->encoder->crtc = save_crtcs[count++];
890         }
891 fail_no_encoder:
892         kfree(save_crtcs);
893         count = 0;
894         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
895                 connector->encoder = save_encoders[count++];
896         }
897         kfree(save_encoders);
898         return ret;
899 }
900 EXPORT_SYMBOL(drm_crtc_helper_set_config);
901
902 bool drm_helper_plugged_event(struct drm_device *dev)
903 {
904         DRM_DEBUG("\n");
905
906         drm_helper_probe_connector_modes(dev, dev->mode_config.max_width,
907                                          dev->mode_config.max_height);
908
909         drm_setup_crtcs(dev);
910
911         /* alert the driver fb layer */
912         dev->mode_config.funcs->fb_changed(dev);
913
914         /* FIXME: send hotplug event */
915         return true;
916 }
917 /**
918  * drm_initial_config - setup a sane initial connector configuration
919  * @dev: DRM device
920  *
921  * LOCKING:
922  * Called at init time, must take mode config lock.
923  *
924  * Scan the CRTCs and connectors and try to put together an initial setup.
925  * At the moment, this is a cloned configuration across all heads with
926  * a new framebuffer object as the backing store.
927  *
928  * RETURNS:
929  * Zero if everything went ok, nonzero otherwise.
930  */
931 bool drm_helper_initial_config(struct drm_device *dev)
932 {
933         struct drm_connector *connector;
934         int count = 0;
935
936         count = drm_helper_probe_connector_modes(dev,
937                                                  dev->mode_config.max_width,
938                                                  dev->mode_config.max_height);
939
940         /*
941          * None of the available connectors had any modes, so add some
942          * and try to light them up anyway
943          */
944         if (!count) {
945                 DRM_ERROR("connectors have no modes, using standard modes\n");
946                 list_for_each_entry(connector,
947                                     &dev->mode_config.connector_list,
948                                     head)
949                         drm_helper_add_std_modes(dev, connector);
950         }
951
952         drm_setup_crtcs(dev);
953
954         /* alert the driver fb layer */
955         dev->mode_config.funcs->fb_changed(dev);
956
957         return 0;
958 }
959 EXPORT_SYMBOL(drm_helper_initial_config);
960
961 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
962 {
963         int dpms = DRM_MODE_DPMS_OFF;
964         struct drm_connector *connector;
965         struct drm_device *dev = encoder->dev;
966
967         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
968                 if (connector->encoder == encoder)
969                         if (connector->dpms < dpms)
970                                 dpms = connector->dpms;
971         return dpms;
972 }
973
974 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
975 {
976         int dpms = DRM_MODE_DPMS_OFF;
977         struct drm_connector *connector;
978         struct drm_device *dev = crtc->dev;
979
980         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
981                 if (connector->encoder && connector->encoder->crtc == crtc)
982                         if (connector->dpms < dpms)
983                                 dpms = connector->dpms;
984         return dpms;
985 }
986
987 /**
988  * drm_helper_connector_dpms
989  * @connector affected connector
990  * @mode DPMS mode
991  *
992  * Calls the low-level connector DPMS function, then
993  * calls appropriate encoder and crtc DPMS functions as well
994  */
995 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
996 {
997         struct drm_encoder *encoder = connector->encoder;
998         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
999         int old_dpms;
1000
1001         if (mode == connector->dpms)
1002                 return;
1003
1004         old_dpms = connector->dpms;
1005         connector->dpms = mode;
1006
1007         /* from off to on, do crtc then encoder */
1008         if (mode < old_dpms) {
1009                 if (crtc) {
1010                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
1011                         if (crtc_funcs->dpms)
1012                                 (*crtc_funcs->dpms) (crtc,
1013                                                      drm_helper_choose_crtc_dpms(crtc));
1014                 }
1015                 if (encoder) {
1016                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
1017                         if (encoder_funcs->dpms)
1018                                 (*encoder_funcs->dpms) (encoder,
1019                                                         drm_helper_choose_encoder_dpms(encoder));
1020                 }
1021         }
1022
1023         /* from on to off, do encoder then crtc */
1024         if (mode > old_dpms) {
1025                 if (encoder) {
1026                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
1027                         if (encoder_funcs->dpms)
1028                                 (*encoder_funcs->dpms) (encoder,
1029                                                         drm_helper_choose_encoder_dpms(encoder));
1030                 }
1031                 if (crtc) {
1032                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
1033                         if (crtc_funcs->dpms)
1034                                 (*crtc_funcs->dpms) (crtc,
1035                                                      drm_helper_choose_crtc_dpms(crtc));
1036                 }
1037         }
1038
1039         return;
1040 }
1041 EXPORT_SYMBOL(drm_helper_connector_dpms);
1042
1043 /**
1044  * drm_hotplug_stage_two
1045  * @dev DRM device
1046  * @connector hotpluged connector
1047  *
1048  * LOCKING.
1049  * Caller must hold mode config lock, function might grab struct lock.
1050  *
1051  * Stage two of a hotplug.
1052  *
1053  * RETURNS:
1054  * Zero on success, errno on failure.
1055  */
1056 int drm_helper_hotplug_stage_two(struct drm_device *dev)
1057 {
1058         drm_helper_plugged_event(dev);
1059
1060         return 0;
1061 }
1062 EXPORT_SYMBOL(drm_helper_hotplug_stage_two);
1063
1064 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
1065                                    struct drm_mode_fb_cmd *mode_cmd)
1066 {
1067         fb->width = mode_cmd->width;
1068         fb->height = mode_cmd->height;
1069         fb->pitch = mode_cmd->pitch;
1070         fb->bits_per_pixel = mode_cmd->bpp;
1071         fb->depth = mode_cmd->depth;
1072
1073         return 0;
1074 }
1075 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
1076
1077 int drm_helper_resume_force_mode(struct drm_device *dev)
1078 {
1079         struct drm_crtc *crtc;
1080         int ret;
1081
1082         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1083
1084                 if (!crtc->enabled)
1085                         continue;
1086
1087                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
1088                                                crtc->x, crtc->y, crtc->fb);
1089
1090                 if (ret == false)
1091                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
1092         }
1093         return 0;
1094 }
1095 EXPORT_SYMBOL(drm_helper_resume_force_mode);