Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc
[linux-2.6] / 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_crtc_in_use - check if a given CRTC is in a mode_config
203  * @crtc: CRTC to check
204  *
205  * LOCKING:
206  * Caller must hold mode config lock.
207  *
208  * Walk @crtc's DRM device's mode_config and see if it's in use.
209  *
210  * RETURNS:
211  * True if @crtc is part of the mode_config, false otherwise.
212  */
213 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
214 {
215         struct drm_encoder *encoder;
216         struct drm_device *dev = crtc->dev;
217         /* FIXME: Locking around list access? */
218         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
219                 if (encoder->crtc == crtc)
220                         return true;
221         return false;
222 }
223 EXPORT_SYMBOL(drm_helper_crtc_in_use);
224
225 /**
226  * drm_disable_unused_functions - disable unused objects
227  * @dev: DRM device
228  *
229  * LOCKING:
230  * Caller must hold mode config lock.
231  *
232  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
233  * by calling its dpms function, which should power it off.
234  */
235 void drm_helper_disable_unused_functions(struct drm_device *dev)
236 {
237         struct drm_encoder *encoder;
238         struct drm_encoder_helper_funcs *encoder_funcs;
239         struct drm_crtc *crtc;
240
241         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
242                 encoder_funcs = encoder->helper_private;
243                 if (!encoder->crtc)
244                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
245         }
246
247         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
248                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
249                 crtc->enabled = drm_helper_crtc_in_use(crtc);
250                 if (!crtc->enabled) {
251                         crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
252                         crtc->fb = NULL;
253                 }
254         }
255 }
256 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
257
258 static struct drm_display_mode *drm_has_preferred_mode(struct drm_connector *connector, int width, int height)
259 {
260         struct drm_display_mode *mode;
261
262         list_for_each_entry(mode, &connector->modes, head) {
263                 if (drm_mode_width(mode) > width ||
264                     drm_mode_height(mode) > height)
265                         continue;
266                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
267                         return mode;
268         }
269         return NULL;
270 }
271
272 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
273 {
274         bool enable;
275
276         if (strict) {
277                 enable = connector->status == connector_status_connected;
278         } else {
279                 enable = connector->status != connector_status_disconnected;
280         }
281         return enable;
282 }
283
284 static void drm_enable_connectors(struct drm_device *dev, bool *enabled)
285 {
286         bool any_enabled = false;
287         struct drm_connector *connector;
288         int i = 0;
289
290         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
291                 enabled[i] = drm_connector_enabled(connector, true);
292                 DRM_DEBUG("connector %d enabled? %s\n", connector->base.id,
293                           enabled[i] ? "yes" : "no");
294                 any_enabled |= enabled[i];
295                 i++;
296         }
297
298         if (any_enabled)
299                 return;
300
301         i = 0;
302         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
303                 enabled[i] = drm_connector_enabled(connector, false);
304                 i++;
305         }
306 }
307
308 static bool drm_target_preferred(struct drm_device *dev,
309                                  struct drm_display_mode **modes,
310                                  bool *enabled, int width, int height)
311 {
312         struct drm_connector *connector;
313         int i = 0;
314
315         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
316
317                 if (enabled[i] == false) {
318                         i++;
319                         continue;
320                 }
321
322                 DRM_DEBUG("looking for preferred mode on connector %d\n",
323                           connector->base.id);
324
325                 modes[i] = drm_has_preferred_mode(connector, width, height);
326                 /* No preferred modes, pick one off the list */
327                 if (!modes[i] && !list_empty(&connector->modes)) {
328                         list_for_each_entry(modes[i], &connector->modes, head)
329                                 break;
330                 }
331                 DRM_DEBUG("found mode %s\n", modes[i] ? modes[i]->name :
332                           "none");
333                 i++;
334         }
335         return true;
336 }
337
338 static int drm_pick_crtcs(struct drm_device *dev,
339                           struct drm_crtc **best_crtcs,
340                           struct drm_display_mode **modes,
341                           int n, int width, int height)
342 {
343         int c, o;
344         struct drm_connector *connector;
345         struct drm_connector_helper_funcs *connector_funcs;
346         struct drm_encoder *encoder;
347         struct drm_crtc *best_crtc;
348         int my_score, best_score, score;
349         struct drm_crtc **crtcs, *crtc;
350
351         if (n == dev->mode_config.num_connector)
352                 return 0;
353         c = 0;
354         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
355                 if (c == n)
356                         break;
357                 c++;
358         }
359
360         best_crtcs[n] = NULL;
361         best_crtc = NULL;
362         best_score = drm_pick_crtcs(dev, best_crtcs, modes, n+1, width, height);
363         if (modes[n] == NULL)
364                 return best_score;
365
366         crtcs = kmalloc(dev->mode_config.num_connector *
367                         sizeof(struct drm_crtc *), GFP_KERNEL);
368         if (!crtcs)
369                 return best_score;
370
371         my_score = 1;
372         if (connector->status == connector_status_connected)
373                 my_score++;
374         if (drm_has_preferred_mode(connector, width, height))
375                 my_score++;
376
377         connector_funcs = connector->helper_private;
378         encoder = connector_funcs->best_encoder(connector);
379         if (!encoder)
380                 goto out;
381
382         connector->encoder = encoder;
383
384         /* select a crtc for this connector and then attempt to configure
385            remaining connectors */
386         c = 0;
387         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
388
389                 if ((connector->encoder->possible_crtcs & (1 << c)) == 0) {
390                         c++;
391                         continue;
392                 }
393
394                 for (o = 0; o < n; o++)
395                         if (best_crtcs[o] == crtc)
396                                 break;
397
398                 if (o < n) {
399                         /* ignore cloning for now */
400                         c++;
401                         continue;
402                 }
403
404                 crtcs[n] = crtc;
405                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_crtc *));
406                 score = my_score + drm_pick_crtcs(dev, crtcs, modes, n + 1,
407                                                   width, height);
408                 if (score > best_score) {
409                         best_crtc = crtc;
410                         best_score = score;
411                         memcpy(best_crtcs, crtcs,
412                                dev->mode_config.num_connector *
413                                sizeof(struct drm_crtc *));
414                 }
415                 c++;
416         }
417 out:
418         kfree(crtcs);
419         return best_score;
420 }
421
422 static void drm_setup_crtcs(struct drm_device *dev)
423 {
424         struct drm_crtc **crtcs;
425         struct drm_display_mode **modes;
426         struct drm_encoder *encoder;
427         struct drm_connector *connector;
428         bool *enabled;
429         int width, height;
430         int i, ret;
431
432         DRM_DEBUG("\n");
433
434         width = dev->mode_config.max_width;
435         height = dev->mode_config.max_height;
436
437         /* clean out all the encoder/crtc combos */
438         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
439                 encoder->crtc = NULL;
440         }
441
442         crtcs = kcalloc(dev->mode_config.num_connector,
443                         sizeof(struct drm_crtc *), GFP_KERNEL);
444         modes = kcalloc(dev->mode_config.num_connector,
445                         sizeof(struct drm_display_mode *), GFP_KERNEL);
446         enabled = kcalloc(dev->mode_config.num_connector,
447                           sizeof(bool), GFP_KERNEL);
448
449         drm_enable_connectors(dev, enabled);
450
451         ret = drm_target_preferred(dev, modes, enabled, width, height);
452         if (!ret)
453                 DRM_ERROR("Unable to find initial modes\n");
454
455         DRM_DEBUG("picking CRTCs for %dx%d config\n", width, height);
456
457         drm_pick_crtcs(dev, crtcs, modes, 0, width, height);
458
459         i = 0;
460         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
461                 struct drm_display_mode *mode = modes[i];
462                 struct drm_crtc *crtc = crtcs[i];
463
464                 if (connector->encoder == NULL) {
465                         i++;
466                         continue;
467                 }
468
469                 if (mode && crtc) {
470                         DRM_DEBUG("desired mode %s set on crtc %d\n",
471                                   mode->name, crtc->base.id);
472                         crtc->desired_mode = mode;
473                         connector->encoder->crtc = crtc;
474                 } else
475                         connector->encoder->crtc = NULL;
476                 i++;
477         }
478
479         kfree(crtcs);
480         kfree(modes);
481         kfree(enabled);
482 }
483
484 /**
485  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
486  * @encoder: encoder to test
487  * @crtc: crtc to test
488  *
489  * Return false if @encoder can't be driven by @crtc, true otherwise.
490  */
491 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
492                                 struct drm_crtc *crtc)
493 {
494         struct drm_device *dev;
495         struct drm_crtc *tmp;
496         int crtc_mask = 1;
497
498         WARN(!crtc, "checking null crtc?");
499
500         dev = crtc->dev;
501
502         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
503                 if (tmp == crtc)
504                         break;
505                 crtc_mask <<= 1;
506         }
507
508         if (encoder->possible_crtcs & crtc_mask)
509                 return true;
510         return false;
511 }
512
513 /*
514  * Check the CRTC we're going to map each output to vs. its current
515  * CRTC.  If they don't match, we have to disable the output and the CRTC
516  * since the driver will have to re-route things.
517  */
518 static void
519 drm_crtc_prepare_encoders(struct drm_device *dev)
520 {
521         struct drm_encoder_helper_funcs *encoder_funcs;
522         struct drm_encoder *encoder;
523
524         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
525                 encoder_funcs = encoder->helper_private;
526                 /* Disable unused encoders */
527                 if (encoder->crtc == NULL)
528                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
529                 /* Disable encoders whose CRTC is about to change */
530                 if (encoder_funcs->get_crtc &&
531                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
532                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
533         }
534 }
535
536 /**
537  * drm_crtc_set_mode - set a mode
538  * @crtc: CRTC to program
539  * @mode: mode to use
540  * @x: width of mode
541  * @y: height of mode
542  *
543  * LOCKING:
544  * Caller must hold mode config lock.
545  *
546  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
547  * to fixup or reject the mode prior to trying to set it.
548  *
549  * RETURNS:
550  * True if the mode was set successfully, or false otherwise.
551  */
552 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
553                               struct drm_display_mode *mode,
554                               int x, int y,
555                               struct drm_framebuffer *old_fb)
556 {
557         struct drm_device *dev = crtc->dev;
558         struct drm_display_mode *adjusted_mode, saved_mode;
559         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
560         struct drm_encoder_helper_funcs *encoder_funcs;
561         int saved_x, saved_y;
562         struct drm_encoder *encoder;
563         bool ret = true;
564         bool depth_changed, bpp_changed;
565
566         adjusted_mode = drm_mode_duplicate(dev, mode);
567
568         crtc->enabled = drm_helper_crtc_in_use(crtc);
569
570         if (!crtc->enabled)
571                 return true;
572
573         if (old_fb && crtc->fb) {
574                 depth_changed = (old_fb->depth != crtc->fb->depth);
575                 bpp_changed = (old_fb->bits_per_pixel !=
576                                crtc->fb->bits_per_pixel);
577         } else {
578                 depth_changed = true;
579                 bpp_changed = true;
580         }
581
582         saved_mode = crtc->mode;
583         saved_x = crtc->x;
584         saved_y = crtc->y;
585
586         /* Update crtc values up front so the driver can rely on them for mode
587          * setting.
588          */
589         crtc->mode = *mode;
590         crtc->x = x;
591         crtc->y = y;
592
593         if (drm_mode_equal(&saved_mode, &crtc->mode)) {
594                 if (saved_x != crtc->x || saved_y != crtc->y ||
595                     depth_changed || bpp_changed) {
596                         ret = !crtc_funcs->mode_set_base(crtc, crtc->x, crtc->y,
597                                                          old_fb);
598                         goto done;
599                 }
600         }
601
602         /* Pass our mode to the connectors and the CRTC to give them a chance to
603          * adjust it according to limitations or connector properties, and also
604          * a chance to reject the mode entirely.
605          */
606         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
607
608                 if (encoder->crtc != crtc)
609                         continue;
610                 encoder_funcs = encoder->helper_private;
611                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
612                                                       adjusted_mode))) {
613                         goto done;
614                 }
615         }
616
617         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
618                 goto done;
619         }
620
621         /* Prepare the encoders and CRTCs before setting the mode. */
622         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
623
624                 if (encoder->crtc != crtc)
625                         continue;
626                 encoder_funcs = encoder->helper_private;
627                 /* Disable the encoders as the first thing we do. */
628                 encoder_funcs->prepare(encoder);
629         }
630
631         drm_crtc_prepare_encoders(dev);
632
633         crtc_funcs->prepare(crtc);
634
635         /* Set up the DPLL and any encoders state that needs to adjust or depend
636          * on the DPLL.
637          */
638         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
639         if (!ret)
640             goto done;
641
642         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
643
644                 if (encoder->crtc != crtc)
645                         continue;
646
647                 DRM_INFO("%s: set mode %s %x\n", drm_get_encoder_name(encoder),
648                          mode->name, mode->base.id);
649                 encoder_funcs = encoder->helper_private;
650                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
651         }
652
653         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
654         crtc_funcs->commit(crtc);
655
656         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
657
658                 if (encoder->crtc != crtc)
659                         continue;
660
661                 encoder_funcs = encoder->helper_private;
662                 encoder_funcs->commit(encoder);
663
664         }
665
666         /* XXX free adjustedmode */
667         drm_mode_destroy(dev, adjusted_mode);
668         /* FIXME: add subpixel order */
669 done:
670         if (!ret) {
671                 crtc->mode = saved_mode;
672                 crtc->x = saved_x;
673                 crtc->y = saved_y;
674         }
675
676         return ret;
677 }
678 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
679
680
681 /**
682  * drm_crtc_helper_set_config - set a new config from userspace
683  * @crtc: CRTC to setup
684  * @crtc_info: user provided configuration
685  * @new_mode: new mode to set
686  * @connector_set: set of connectors for the new config
687  * @fb: new framebuffer
688  *
689  * LOCKING:
690  * Caller must hold mode config lock.
691  *
692  * Setup a new configuration, provided by the user in @crtc_info, and enable
693  * it.
694  *
695  * RETURNS:
696  * Zero. (FIXME)
697  */
698 int drm_crtc_helper_set_config(struct drm_mode_set *set)
699 {
700         struct drm_device *dev;
701         struct drm_crtc **save_crtcs, *new_crtc;
702         struct drm_encoder **save_encoders, *new_encoder;
703         struct drm_framebuffer *old_fb = NULL;
704         bool save_enabled;
705         bool mode_changed = false;
706         bool fb_changed = false;
707         struct drm_connector *connector;
708         int count = 0, ro, fail = 0;
709         struct drm_crtc_helper_funcs *crtc_funcs;
710         int ret = 0;
711
712         DRM_DEBUG("\n");
713
714         if (!set)
715                 return -EINVAL;
716
717         if (!set->crtc)
718                 return -EINVAL;
719
720         if (!set->crtc->helper_private)
721                 return -EINVAL;
722
723         crtc_funcs = set->crtc->helper_private;
724
725         DRM_DEBUG("crtc: %p %d fb: %p connectors: %p num_connectors: %d (x, y) (%i, %i)\n",
726                   set->crtc, set->crtc->base.id, set->fb, set->connectors,
727                   (int)set->num_connectors, set->x, set->y);
728
729         dev = set->crtc->dev;
730
731         /* save previous config */
732         save_enabled = set->crtc->enabled;
733
734         /*
735          * We do mode_config.num_connectors here since we'll look at the
736          * CRTC and encoder associated with each connector later.
737          */
738         save_crtcs = kzalloc(dev->mode_config.num_connector *
739                              sizeof(struct drm_crtc *), GFP_KERNEL);
740         if (!save_crtcs)
741                 return -ENOMEM;
742
743         save_encoders = kzalloc(dev->mode_config.num_connector *
744                                 sizeof(struct drm_encoders *), GFP_KERNEL);
745         if (!save_encoders) {
746                 kfree(save_crtcs);
747                 return -ENOMEM;
748         }
749
750         /* We should be able to check here if the fb has the same properties
751          * and then just flip_or_move it */
752         if (set->crtc->fb != set->fb) {
753                 /* If we have no fb then treat it as a full mode set */
754                 if (set->crtc->fb == NULL) {
755                         DRM_DEBUG("crtc has no fb, full mode set\n");
756                         mode_changed = true;
757                 } else if ((set->fb->bits_per_pixel !=
758                          set->crtc->fb->bits_per_pixel) ||
759                          set->fb->depth != set->crtc->fb->depth)
760                         fb_changed = true;
761                 else
762                         fb_changed = true;
763         }
764
765         if (set->x != set->crtc->x || set->y != set->crtc->y)
766                 fb_changed = true;
767
768         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
769                 DRM_DEBUG("modes are different, full mode set\n");
770                 drm_mode_debug_printmodeline(&set->crtc->mode);
771                 drm_mode_debug_printmodeline(set->mode);
772                 mode_changed = true;
773         }
774
775         /* a) traverse passed in connector list and get encoders for them */
776         count = 0;
777         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
778                 struct drm_connector_helper_funcs *connector_funcs =
779                         connector->helper_private;
780                 save_encoders[count++] = connector->encoder;
781                 new_encoder = connector->encoder;
782                 for (ro = 0; ro < set->num_connectors; ro++) {
783                         if (set->connectors[ro] == connector) {
784                                 new_encoder = connector_funcs->best_encoder(connector);
785                                 /* if we can't get an encoder for a connector
786                                    we are setting now - then fail */
787                                 if (new_encoder == NULL)
788                                         /* don't break so fail path works correct */
789                                         fail = 1;
790                                 break;
791                         }
792                 }
793
794                 if (new_encoder != connector->encoder) {
795                         DRM_DEBUG("encoder changed, full mode switch\n");
796                         mode_changed = true;
797                         connector->encoder = new_encoder;
798                 }
799         }
800
801         if (fail) {
802                 ret = -EINVAL;
803                 goto fail_no_encoder;
804         }
805
806         count = 0;
807         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
808                 if (!connector->encoder)
809                         continue;
810
811                 save_crtcs[count++] = connector->encoder->crtc;
812
813                 if (connector->encoder->crtc == set->crtc)
814                         new_crtc = NULL;
815                 else
816                         new_crtc = connector->encoder->crtc;
817
818                 for (ro = 0; ro < set->num_connectors; ro++) {
819                         if (set->connectors[ro] == connector)
820                                 new_crtc = set->crtc;
821                 }
822
823                 /* Make sure the new CRTC will work with the encoder */
824                 if (new_crtc &&
825                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
826                         ret = -EINVAL;
827                         goto fail_set_mode;
828                 }
829                 if (new_crtc != connector->encoder->crtc) {
830                         DRM_DEBUG("crtc changed, full mode switch\n");
831                         mode_changed = true;
832                         connector->encoder->crtc = new_crtc;
833                 }
834                 DRM_DEBUG("setting connector %d crtc to %p\n",
835                           connector->base.id, new_crtc);
836         }
837
838         /* mode_set_base is not a required function */
839         if (fb_changed && !crtc_funcs->mode_set_base)
840                 mode_changed = true;
841
842         if (mode_changed) {
843                 old_fb = set->crtc->fb;
844                 set->crtc->fb = set->fb;
845                 set->crtc->enabled = (set->mode != NULL);
846                 if (set->mode != NULL) {
847                         DRM_DEBUG("attempting to set mode from userspace\n");
848                         drm_mode_debug_printmodeline(set->mode);
849                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
850                                                       set->x, set->y,
851                                                       old_fb)) {
852                                 DRM_ERROR("failed to set mode on crtc %p\n",
853                                           set->crtc);
854                                 ret = -EINVAL;
855                                 goto fail_set_mode;
856                         }
857                         /* TODO are these needed? */
858                         set->crtc->desired_x = set->x;
859                         set->crtc->desired_y = set->y;
860                         set->crtc->desired_mode = set->mode;
861                 }
862                 drm_helper_disable_unused_functions(dev);
863         } else if (fb_changed) {
864                 old_fb = set->crtc->fb;
865                 if (set->crtc->fb != set->fb)
866                         set->crtc->fb = set->fb;
867                 ret = crtc_funcs->mode_set_base(set->crtc,
868                                                 set->x, set->y, old_fb);
869                 if (ret != 0)
870                     goto fail_set_mode;
871         }
872
873         kfree(save_encoders);
874         kfree(save_crtcs);
875         return 0;
876
877 fail_set_mode:
878         set->crtc->enabled = save_enabled;
879         set->crtc->fb = old_fb;
880         count = 0;
881         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
882                 if (!connector->encoder)
883                         continue;
884
885                 connector->encoder->crtc = save_crtcs[count++];
886         }
887 fail_no_encoder:
888         kfree(save_crtcs);
889         count = 0;
890         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
891                 connector->encoder = save_encoders[count++];
892         }
893         kfree(save_encoders);
894         return ret;
895 }
896 EXPORT_SYMBOL(drm_crtc_helper_set_config);
897
898 bool drm_helper_plugged_event(struct drm_device *dev)
899 {
900         DRM_DEBUG("\n");
901
902         drm_helper_probe_connector_modes(dev, dev->mode_config.max_width,
903                                          dev->mode_config.max_height);
904
905         drm_setup_crtcs(dev);
906
907         /* alert the driver fb layer */
908         dev->mode_config.funcs->fb_changed(dev);
909
910         /* FIXME: send hotplug event */
911         return true;
912 }
913 /**
914  * drm_initial_config - setup a sane initial connector configuration
915  * @dev: DRM device
916  *
917  * LOCKING:
918  * Called at init time, must take mode config lock.
919  *
920  * Scan the CRTCs and connectors and try to put together an initial setup.
921  * At the moment, this is a cloned configuration across all heads with
922  * a new framebuffer object as the backing store.
923  *
924  * RETURNS:
925  * Zero if everything went ok, nonzero otherwise.
926  */
927 bool drm_helper_initial_config(struct drm_device *dev)
928 {
929         struct drm_connector *connector;
930         int count = 0;
931
932         count = drm_helper_probe_connector_modes(dev,
933                                                  dev->mode_config.max_width,
934                                                  dev->mode_config.max_height);
935
936         /*
937          * None of the available connectors had any modes, so add some
938          * and try to light them up anyway
939          */
940         if (!count) {
941                 DRM_ERROR("connectors have no modes, using standard modes\n");
942                 list_for_each_entry(connector,
943                                     &dev->mode_config.connector_list,
944                                     head)
945                         drm_helper_add_std_modes(dev, connector);
946         }
947
948         drm_setup_crtcs(dev);
949
950         /* alert the driver fb layer */
951         dev->mode_config.funcs->fb_changed(dev);
952
953         return 0;
954 }
955 EXPORT_SYMBOL(drm_helper_initial_config);
956
957 /**
958  * drm_hotplug_stage_two
959  * @dev DRM device
960  * @connector hotpluged connector
961  *
962  * LOCKING.
963  * Caller must hold mode config lock, function might grab struct lock.
964  *
965  * Stage two of a hotplug.
966  *
967  * RETURNS:
968  * Zero on success, errno on failure.
969  */
970 int drm_helper_hotplug_stage_two(struct drm_device *dev)
971 {
972         drm_helper_plugged_event(dev);
973
974         return 0;
975 }
976 EXPORT_SYMBOL(drm_helper_hotplug_stage_two);
977
978 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
979                                    struct drm_mode_fb_cmd *mode_cmd)
980 {
981         fb->width = mode_cmd->width;
982         fb->height = mode_cmd->height;
983         fb->pitch = mode_cmd->pitch;
984         fb->bits_per_pixel = mode_cmd->bpp;
985         fb->depth = mode_cmd->depth;
986
987         return 0;
988 }
989 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
990
991 int drm_helper_resume_force_mode(struct drm_device *dev)
992 {
993         struct drm_crtc *crtc;
994         int ret;
995
996         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
997
998                 if (!crtc->enabled)
999                         continue;
1000
1001                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
1002                                                crtc->x, crtc->y, crtc->fb);
1003
1004                 if (ret == false)
1005                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
1006         }
1007         return 0;
1008 }
1009 EXPORT_SYMBOL(drm_helper_resume_force_mode);