drm/kms: Init the CRTC info fields for modes forced from the command line.
[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 #include "drm_fb_helper.h"
36
37 static void drm_mode_validate_flag(struct drm_connector *connector,
38                                    int flags)
39 {
40         struct drm_display_mode *mode, *t;
41
42         if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
43                 return;
44
45         list_for_each_entry_safe(mode, t, &connector->modes, head) {
46                 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
47                                 !(flags & DRM_MODE_FLAG_INTERLACE))
48                         mode->status = MODE_NO_INTERLACE;
49                 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
50                                 !(flags & DRM_MODE_FLAG_DBLSCAN))
51                         mode->status = MODE_NO_DBLESCAN;
52         }
53
54         return;
55 }
56
57 /**
58  * drm_helper_probe_connector_modes - get complete set of display modes
59  * @dev: DRM device
60  * @maxX: max width for modes
61  * @maxY: max height for modes
62  *
63  * LOCKING:
64  * Caller must hold mode config lock.
65  *
66  * Based on @dev's mode_config layout, scan all the connectors and try to detect
67  * modes on them.  Modes will first be added to the connector's probed_modes
68  * list, then culled (based on validity and the @maxX, @maxY parameters) and
69  * put into the normal modes list.
70  *
71  * Intended to be used either at bootup time or when major configuration
72  * changes have occurred.
73  *
74  * FIXME: take into account monitor limits
75  *
76  * RETURNS:
77  * Number of modes found on @connector.
78  */
79 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
80                                             uint32_t maxX, uint32_t maxY)
81 {
82         struct drm_device *dev = connector->dev;
83         struct drm_display_mode *mode, *t;
84         struct drm_connector_helper_funcs *connector_funcs =
85                 connector->helper_private;
86         int count = 0;
87         int mode_flags = 0;
88
89         DRM_DEBUG_KMS("%s\n", drm_get_connector_name(connector));
90         /* set all modes to the unverified state */
91         list_for_each_entry_safe(mode, t, &connector->modes, head)
92                 mode->status = MODE_UNVERIFIED;
93
94         if (connector->force) {
95                 if (connector->force == DRM_FORCE_ON)
96                         connector->status = connector_status_connected;
97                 else
98                         connector->status = connector_status_disconnected;
99                 if (connector->funcs->force)
100                         connector->funcs->force(connector);
101         } else
102                 connector->status = connector->funcs->detect(connector);
103
104         if (connector->status == connector_status_disconnected) {
105                 DRM_DEBUG_KMS("%s is disconnected\n",
106                           drm_get_connector_name(connector));
107                 goto prune;
108         }
109
110         count = (*connector_funcs->get_modes)(connector);
111         if (!count) {
112                 count = drm_add_modes_noedid(connector, 800, 600);
113                 if (!count)
114                         return 0;
115         }
116
117         drm_mode_connector_list_update(connector);
118
119         if (maxX && maxY)
120                 drm_mode_validate_size(dev, &connector->modes, maxX,
121                                        maxY, 0);
122
123         if (connector->interlace_allowed)
124                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
125         if (connector->doublescan_allowed)
126                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
127         drm_mode_validate_flag(connector, mode_flags);
128
129         list_for_each_entry_safe(mode, t, &connector->modes, head) {
130                 if (mode->status == MODE_OK)
131                         mode->status = connector_funcs->mode_valid(connector,
132                                                                    mode);
133         }
134
135 prune:
136         drm_mode_prune_invalid(dev, &connector->modes, true);
137
138         if (list_empty(&connector->modes))
139                 return 0;
140
141         drm_mode_sort(&connector->modes);
142
143         DRM_DEBUG_KMS("Probed modes for %s\n",
144                                 drm_get_connector_name(connector));
145         list_for_each_entry_safe(mode, t, &connector->modes, head) {
146                 mode->vrefresh = drm_mode_vrefresh(mode);
147
148                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
149                 drm_mode_debug_printmodeline(mode);
150         }
151
152         return count;
153 }
154 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
155
156 int drm_helper_probe_connector_modes(struct drm_device *dev, uint32_t maxX,
157                                       uint32_t maxY)
158 {
159         struct drm_connector *connector;
160         int count = 0;
161
162         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
163                 count += drm_helper_probe_single_connector_modes(connector,
164                                                                  maxX, maxY);
165         }
166
167         return count;
168 }
169 EXPORT_SYMBOL(drm_helper_probe_connector_modes);
170
171 /**
172  * drm_helper_encoder_in_use - check if a given encoder is in use
173  * @encoder: encoder to check
174  *
175  * LOCKING:
176  * Caller must hold mode config lock.
177  *
178  * Walk @encoders's DRM device's mode_config and see if it's in use.
179  *
180  * RETURNS:
181  * True if @encoder is part of the mode_config, false otherwise.
182  */
183 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
184 {
185         struct drm_connector *connector;
186         struct drm_device *dev = encoder->dev;
187         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
188                 if (connector->encoder == encoder)
189                         return true;
190         return false;
191 }
192 EXPORT_SYMBOL(drm_helper_encoder_in_use);
193
194 /**
195  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
196  * @crtc: CRTC to check
197  *
198  * LOCKING:
199  * Caller must hold mode config lock.
200  *
201  * Walk @crtc's DRM device's mode_config and see if it's in use.
202  *
203  * RETURNS:
204  * True if @crtc is part of the mode_config, false otherwise.
205  */
206 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
207 {
208         struct drm_encoder *encoder;
209         struct drm_device *dev = crtc->dev;
210         /* FIXME: Locking around list access? */
211         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
212                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
213                         return true;
214         return false;
215 }
216 EXPORT_SYMBOL(drm_helper_crtc_in_use);
217
218 /**
219  * drm_disable_unused_functions - disable unused objects
220  * @dev: DRM device
221  *
222  * LOCKING:
223  * Caller must hold mode config lock.
224  *
225  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
226  * by calling its dpms function, which should power it off.
227  */
228 void drm_helper_disable_unused_functions(struct drm_device *dev)
229 {
230         struct drm_encoder *encoder;
231         struct drm_connector *connector;
232         struct drm_encoder_helper_funcs *encoder_funcs;
233         struct drm_crtc *crtc;
234
235         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
236                 if (!connector->encoder)
237                         continue;
238                 if (connector->status == connector_status_disconnected)
239                         connector->encoder = NULL;
240         }
241
242         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
243                 encoder_funcs = encoder->helper_private;
244                 if (!drm_helper_encoder_in_use(encoder)) {
245                         if (encoder_funcs->disable)
246                                 (*encoder_funcs->disable)(encoder);
247                         else
248                                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
249                         /* disconnector encoder from any connector */
250                         encoder->crtc = NULL;
251                 }
252         }
253
254         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
255                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
256                 crtc->enabled = drm_helper_crtc_in_use(crtc);
257                 if (!crtc->enabled) {
258                         crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
259                         crtc->fb = NULL;
260                 }
261         }
262 }
263 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
264
265 static struct drm_display_mode *drm_has_preferred_mode(struct drm_connector *connector, int width, int height)
266 {
267         struct drm_display_mode *mode;
268
269         list_for_each_entry(mode, &connector->modes, head) {
270                 if (drm_mode_width(mode) > width ||
271                     drm_mode_height(mode) > height)
272                         continue;
273                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
274                         return mode;
275         }
276         return NULL;
277 }
278
279 static bool drm_has_cmdline_mode(struct drm_connector *connector)
280 {
281         struct drm_fb_helper_connector *fb_help_conn = connector->fb_helper_private;
282         struct drm_fb_helper_cmdline_mode *cmdline_mode;
283
284         if (!fb_help_conn)
285                 return false;
286
287         cmdline_mode = &fb_help_conn->cmdline_mode;
288         return cmdline_mode->specified;
289 }
290
291 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_connector *connector, int width, int height)
292 {
293         struct drm_fb_helper_connector *fb_help_conn = connector->fb_helper_private;
294         struct drm_fb_helper_cmdline_mode *cmdline_mode;
295         struct drm_display_mode *mode = NULL;
296
297         if (!fb_help_conn)
298                 return mode;
299
300         cmdline_mode = &fb_help_conn->cmdline_mode;
301         if (cmdline_mode->specified == false)
302                 return mode;
303
304         /* attempt to find a matching mode in the list of modes
305          *  we have gotten so far, if not add a CVT mode that conforms
306          */
307         if (cmdline_mode->rb || cmdline_mode->margins)
308                 goto create_mode;
309
310         list_for_each_entry(mode, &connector->modes, head) {
311                 /* check width/height */
312                 if (mode->hdisplay != cmdline_mode->xres ||
313                     mode->vdisplay != cmdline_mode->yres)
314                         continue;
315
316                 if (cmdline_mode->refresh_specified) {
317                         if (mode->vrefresh != cmdline_mode->refresh)
318                                 continue;
319                 }
320
321                 if (cmdline_mode->interlace) {
322                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
323                                 continue;
324                 }
325                 return mode;
326         }
327
328 create_mode:
329         mode = drm_cvt_mode(connector->dev, cmdline_mode->xres,
330                             cmdline_mode->yres,
331                             cmdline_mode->refresh_specified ? cmdline_mode->refresh : 60,
332                             cmdline_mode->rb, cmdline_mode->interlace,
333                             cmdline_mode->margins);
334         drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
335         list_add(&mode->head, &connector->modes);
336         return mode;
337 }
338
339 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
340 {
341         bool enable;
342
343         if (strict) {
344                 enable = connector->status == connector_status_connected;
345         } else {
346                 enable = connector->status != connector_status_disconnected;
347         }
348         return enable;
349 }
350
351 static void drm_enable_connectors(struct drm_device *dev, bool *enabled)
352 {
353         bool any_enabled = false;
354         struct drm_connector *connector;
355         int i = 0;
356
357         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
358                 enabled[i] = drm_connector_enabled(connector, true);
359                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
360                           enabled[i] ? "yes" : "no");
361                 any_enabled |= enabled[i];
362                 i++;
363         }
364
365         if (any_enabled)
366                 return;
367
368         i = 0;
369         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
370                 enabled[i] = drm_connector_enabled(connector, false);
371                 i++;
372         }
373 }
374
375 static bool drm_target_preferred(struct drm_device *dev,
376                                  struct drm_display_mode **modes,
377                                  bool *enabled, int width, int height)
378 {
379         struct drm_connector *connector;
380         int i = 0;
381
382         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
383
384                 if (enabled[i] == false) {
385                         i++;
386                         continue;
387                 }
388
389                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
390                               connector->base.id);
391
392                 /* got for command line mode first */
393                 modes[i] = drm_pick_cmdline_mode(connector, width, height);
394                 if (!modes[i]) {
395                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
396                                       connector->base.id);
397                         modes[i] = drm_has_preferred_mode(connector, width, height);
398                 }
399                 /* No preferred modes, pick one off the list */
400                 if (!modes[i] && !list_empty(&connector->modes)) {
401                         list_for_each_entry(modes[i], &connector->modes, head)
402                                 break;
403                 }
404                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
405                           "none");
406                 i++;
407         }
408         return true;
409 }
410
411 static int drm_pick_crtcs(struct drm_device *dev,
412                           struct drm_crtc **best_crtcs,
413                           struct drm_display_mode **modes,
414                           int n, int width, int height)
415 {
416         int c, o;
417         struct drm_connector *connector;
418         struct drm_connector_helper_funcs *connector_funcs;
419         struct drm_encoder *encoder;
420         struct drm_crtc *best_crtc;
421         int my_score, best_score, score;
422         struct drm_crtc **crtcs, *crtc;
423
424         if (n == dev->mode_config.num_connector)
425                 return 0;
426         c = 0;
427         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
428                 if (c == n)
429                         break;
430                 c++;
431         }
432
433         best_crtcs[n] = NULL;
434         best_crtc = NULL;
435         best_score = drm_pick_crtcs(dev, best_crtcs, modes, n+1, width, height);
436         if (modes[n] == NULL)
437                 return best_score;
438
439         crtcs = kmalloc(dev->mode_config.num_connector *
440                         sizeof(struct drm_crtc *), GFP_KERNEL);
441         if (!crtcs)
442                 return best_score;
443
444         my_score = 1;
445         if (connector->status == connector_status_connected)
446                 my_score++;
447         if (drm_has_cmdline_mode(connector))
448                 my_score++;
449         if (drm_has_preferred_mode(connector, width, height))
450                 my_score++;
451
452         connector_funcs = connector->helper_private;
453         encoder = connector_funcs->best_encoder(connector);
454         if (!encoder)
455                 goto out;
456
457         connector->encoder = encoder;
458
459         /* select a crtc for this connector and then attempt to configure
460            remaining connectors */
461         c = 0;
462         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
463
464                 if ((encoder->possible_crtcs & (1 << c)) == 0) {
465                         c++;
466                         continue;
467                 }
468
469                 for (o = 0; o < n; o++)
470                         if (best_crtcs[o] == crtc)
471                                 break;
472
473                 if (o < n) {
474                         /* ignore cloning for now */
475                         c++;
476                         continue;
477                 }
478
479                 crtcs[n] = crtc;
480                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_crtc *));
481                 score = my_score + drm_pick_crtcs(dev, crtcs, modes, n + 1,
482                                                   width, height);
483                 if (score > best_score) {
484                         best_crtc = crtc;
485                         best_score = score;
486                         memcpy(best_crtcs, crtcs,
487                                dev->mode_config.num_connector *
488                                sizeof(struct drm_crtc *));
489                 }
490                 c++;
491         }
492 out:
493         kfree(crtcs);
494         return best_score;
495 }
496
497 static void drm_setup_crtcs(struct drm_device *dev)
498 {
499         struct drm_crtc **crtcs;
500         struct drm_display_mode **modes;
501         struct drm_encoder *encoder;
502         struct drm_connector *connector;
503         bool *enabled;
504         int width, height;
505         int i, ret;
506
507         DRM_DEBUG_KMS("\n");
508
509         width = dev->mode_config.max_width;
510         height = dev->mode_config.max_height;
511
512         /* clean out all the encoder/crtc combos */
513         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
514                 encoder->crtc = NULL;
515         }
516
517         crtcs = kcalloc(dev->mode_config.num_connector,
518                         sizeof(struct drm_crtc *), GFP_KERNEL);
519         modes = kcalloc(dev->mode_config.num_connector,
520                         sizeof(struct drm_display_mode *), GFP_KERNEL);
521         enabled = kcalloc(dev->mode_config.num_connector,
522                           sizeof(bool), GFP_KERNEL);
523
524         drm_enable_connectors(dev, enabled);
525
526         ret = drm_target_preferred(dev, modes, enabled, width, height);
527         if (!ret)
528                 DRM_ERROR("Unable to find initial modes\n");
529
530         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
531
532         drm_pick_crtcs(dev, crtcs, modes, 0, width, height);
533
534         i = 0;
535         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
536                 struct drm_display_mode *mode = modes[i];
537                 struct drm_crtc *crtc = crtcs[i];
538
539                 if (connector->encoder == NULL) {
540                         i++;
541                         continue;
542                 }
543
544                 if (mode && crtc) {
545                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
546                                   mode->name, crtc->base.id);
547                         crtc->desired_mode = mode;
548                         connector->encoder->crtc = crtc;
549                 } else {
550                         connector->encoder->crtc = NULL;
551                         connector->encoder = NULL;
552                 }
553                 i++;
554         }
555
556         kfree(crtcs);
557         kfree(modes);
558         kfree(enabled);
559 }
560
561 /**
562  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
563  * @encoder: encoder to test
564  * @crtc: crtc to test
565  *
566  * Return false if @encoder can't be driven by @crtc, true otherwise.
567  */
568 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
569                                 struct drm_crtc *crtc)
570 {
571         struct drm_device *dev;
572         struct drm_crtc *tmp;
573         int crtc_mask = 1;
574
575         WARN(!crtc, "checking null crtc?");
576
577         dev = crtc->dev;
578
579         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
580                 if (tmp == crtc)
581                         break;
582                 crtc_mask <<= 1;
583         }
584
585         if (encoder->possible_crtcs & crtc_mask)
586                 return true;
587         return false;
588 }
589
590 /*
591  * Check the CRTC we're going to map each output to vs. its current
592  * CRTC.  If they don't match, we have to disable the output and the CRTC
593  * since the driver will have to re-route things.
594  */
595 static void
596 drm_crtc_prepare_encoders(struct drm_device *dev)
597 {
598         struct drm_encoder_helper_funcs *encoder_funcs;
599         struct drm_encoder *encoder;
600
601         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
602                 encoder_funcs = encoder->helper_private;
603                 /* Disable unused encoders */
604                 if (encoder->crtc == NULL)
605                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
606                 /* Disable encoders whose CRTC is about to change */
607                 if (encoder_funcs->get_crtc &&
608                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
609                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
610         }
611 }
612
613 /**
614  * drm_crtc_set_mode - set a mode
615  * @crtc: CRTC to program
616  * @mode: mode to use
617  * @x: width of mode
618  * @y: height of mode
619  *
620  * LOCKING:
621  * Caller must hold mode config lock.
622  *
623  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
624  * to fixup or reject the mode prior to trying to set it.
625  *
626  * RETURNS:
627  * True if the mode was set successfully, or false otherwise.
628  */
629 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
630                               struct drm_display_mode *mode,
631                               int x, int y,
632                               struct drm_framebuffer *old_fb)
633 {
634         struct drm_device *dev = crtc->dev;
635         struct drm_display_mode *adjusted_mode, saved_mode;
636         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
637         struct drm_encoder_helper_funcs *encoder_funcs;
638         int saved_x, saved_y;
639         struct drm_encoder *encoder;
640         bool ret = true;
641
642         adjusted_mode = drm_mode_duplicate(dev, mode);
643
644         crtc->enabled = drm_helper_crtc_in_use(crtc);
645
646         if (!crtc->enabled)
647                 return true;
648
649         saved_mode = crtc->mode;
650         saved_x = crtc->x;
651         saved_y = crtc->y;
652
653         /* Update crtc values up front so the driver can rely on them for mode
654          * setting.
655          */
656         crtc->mode = *mode;
657         crtc->x = x;
658         crtc->y = y;
659
660         /* Pass our mode to the connectors and the CRTC to give them a chance to
661          * adjust it according to limitations or connector properties, and also
662          * a chance to reject the mode entirely.
663          */
664         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
665
666                 if (encoder->crtc != crtc)
667                         continue;
668                 encoder_funcs = encoder->helper_private;
669                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
670                                                       adjusted_mode))) {
671                         goto done;
672                 }
673         }
674
675         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
676                 goto done;
677         }
678
679         /* Prepare the encoders and CRTCs before setting the mode. */
680         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
681
682                 if (encoder->crtc != crtc)
683                         continue;
684                 encoder_funcs = encoder->helper_private;
685                 /* Disable the encoders as the first thing we do. */
686                 encoder_funcs->prepare(encoder);
687         }
688
689         drm_crtc_prepare_encoders(dev);
690
691         crtc_funcs->prepare(crtc);
692
693         /* Set up the DPLL and any encoders state that needs to adjust or depend
694          * on the DPLL.
695          */
696         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
697         if (!ret)
698             goto done;
699
700         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
701
702                 if (encoder->crtc != crtc)
703                         continue;
704
705                 DRM_INFO("%s: set mode %s %x\n", drm_get_encoder_name(encoder),
706                          mode->name, mode->base.id);
707                 encoder_funcs = encoder->helper_private;
708                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
709         }
710
711         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
712         crtc_funcs->commit(crtc);
713
714         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
715
716                 if (encoder->crtc != crtc)
717                         continue;
718
719                 encoder_funcs = encoder->helper_private;
720                 encoder_funcs->commit(encoder);
721
722         }
723
724         /* XXX free adjustedmode */
725         drm_mode_destroy(dev, adjusted_mode);
726         /* FIXME: add subpixel order */
727 done:
728         if (!ret) {
729                 crtc->mode = saved_mode;
730                 crtc->x = saved_x;
731                 crtc->y = saved_y;
732         }
733
734         return ret;
735 }
736 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
737
738
739 /**
740  * drm_crtc_helper_set_config - set a new config from userspace
741  * @crtc: CRTC to setup
742  * @crtc_info: user provided configuration
743  * @new_mode: new mode to set
744  * @connector_set: set of connectors for the new config
745  * @fb: new framebuffer
746  *
747  * LOCKING:
748  * Caller must hold mode config lock.
749  *
750  * Setup a new configuration, provided by the user in @crtc_info, and enable
751  * it.
752  *
753  * RETURNS:
754  * Zero. (FIXME)
755  */
756 int drm_crtc_helper_set_config(struct drm_mode_set *set)
757 {
758         struct drm_device *dev;
759         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
760         struct drm_encoder *save_encoders, *new_encoder, *encoder;
761         struct drm_framebuffer *old_fb = NULL;
762         bool mode_changed = false; /* if true do a full mode set */
763         bool fb_changed = false; /* if true and !mode_changed just do a flip */
764         struct drm_connector *save_connectors, *connector;
765         int count = 0, ro, fail = 0;
766         struct drm_crtc_helper_funcs *crtc_funcs;
767         int ret = 0;
768
769         DRM_DEBUG_KMS("\n");
770
771         if (!set)
772                 return -EINVAL;
773
774         if (!set->crtc)
775                 return -EINVAL;
776
777         if (!set->crtc->helper_private)
778                 return -EINVAL;
779
780         crtc_funcs = set->crtc->helper_private;
781
782         DRM_DEBUG_KMS("crtc: %p %d fb: %p connectors: %p num_connectors:"
783                         " %d (x, y) (%i, %i)\n",
784                   set->crtc, set->crtc->base.id, set->fb, set->connectors,
785                   (int)set->num_connectors, set->x, set->y);
786
787         dev = set->crtc->dev;
788
789         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
790          * connector data. */
791         save_crtcs = kzalloc(dev->mode_config.num_crtc *
792                              sizeof(struct drm_crtc), GFP_KERNEL);
793         if (!save_crtcs)
794                 return -ENOMEM;
795
796         save_encoders = kzalloc(dev->mode_config.num_encoder *
797                                 sizeof(struct drm_encoder), GFP_KERNEL);
798         if (!save_encoders) {
799                 kfree(save_crtcs);
800                 return -ENOMEM;
801         }
802
803         save_connectors = kzalloc(dev->mode_config.num_connector *
804                                 sizeof(struct drm_connector), GFP_KERNEL);
805         if (!save_connectors) {
806                 kfree(save_crtcs);
807                 kfree(save_encoders);
808                 return -ENOMEM;
809         }
810
811         /* Copy data. Note that driver private data is not affected.
812          * Should anything bad happen only the expected state is
813          * restored, not the drivers personal bookkeeping.
814          */
815         count = 0;
816         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
817                 save_crtcs[count++] = *crtc;
818         }
819
820         count = 0;
821         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
822                 save_encoders[count++] = *encoder;
823         }
824
825         count = 0;
826         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
827                 save_connectors[count++] = *connector;
828         }
829
830         /* We should be able to check here if the fb has the same properties
831          * and then just flip_or_move it */
832         if (set->crtc->fb != set->fb) {
833                 /* If we have no fb then treat it as a full mode set */
834                 if (set->crtc->fb == NULL) {
835                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
836                         mode_changed = true;
837                 } else if (set->fb == NULL) {
838                         mode_changed = true;
839                 } else if ((set->fb->bits_per_pixel !=
840                          set->crtc->fb->bits_per_pixel) ||
841                          set->fb->depth != set->crtc->fb->depth)
842                         fb_changed = true;
843                 else
844                         fb_changed = true;
845         }
846
847         if (set->x != set->crtc->x || set->y != set->crtc->y)
848                 fb_changed = true;
849
850         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
851                 DRM_DEBUG_KMS("modes are different, full mode set\n");
852                 drm_mode_debug_printmodeline(&set->crtc->mode);
853                 drm_mode_debug_printmodeline(set->mode);
854                 mode_changed = true;
855         }
856
857         /* a) traverse passed in connector list and get encoders for them */
858         count = 0;
859         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
860                 struct drm_connector_helper_funcs *connector_funcs =
861                         connector->helper_private;
862                 new_encoder = connector->encoder;
863                 for (ro = 0; ro < set->num_connectors; ro++) {
864                         if (set->connectors[ro] == connector) {
865                                 new_encoder = connector_funcs->best_encoder(connector);
866                                 /* if we can't get an encoder for a connector
867                                    we are setting now - then fail */
868                                 if (new_encoder == NULL)
869                                         /* don't break so fail path works correct */
870                                         fail = 1;
871                                 break;
872                         }
873                 }
874
875                 if (new_encoder != connector->encoder) {
876                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
877                         mode_changed = true;
878                         /* If the encoder is reused for another connector, then
879                          * the appropriate crtc will be set later.
880                          */
881                         if (connector->encoder)
882                                 connector->encoder->crtc = NULL;
883                         connector->encoder = new_encoder;
884                 }
885         }
886
887         if (fail) {
888                 ret = -EINVAL;
889                 goto fail;
890         }
891
892         count = 0;
893         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
894                 if (!connector->encoder)
895                         continue;
896
897                 if (connector->encoder->crtc == set->crtc)
898                         new_crtc = NULL;
899                 else
900                         new_crtc = connector->encoder->crtc;
901
902                 for (ro = 0; ro < set->num_connectors; ro++) {
903                         if (set->connectors[ro] == connector)
904                                 new_crtc = set->crtc;
905                 }
906
907                 /* Make sure the new CRTC will work with the encoder */
908                 if (new_crtc &&
909                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
910                         ret = -EINVAL;
911                         goto fail;
912                 }
913                 if (new_crtc != connector->encoder->crtc) {
914                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
915                         mode_changed = true;
916                         connector->encoder->crtc = new_crtc;
917                 }
918                 DRM_DEBUG_KMS("setting connector %d crtc to %p\n",
919                           connector->base.id, new_crtc);
920         }
921
922         /* mode_set_base is not a required function */
923         if (fb_changed && !crtc_funcs->mode_set_base)
924                 mode_changed = true;
925
926         if (mode_changed) {
927                 old_fb = set->crtc->fb;
928                 set->crtc->fb = set->fb;
929                 set->crtc->enabled = (set->mode != NULL);
930                 if (set->mode != NULL) {
931                         DRM_DEBUG_KMS("attempting to set mode from"
932                                         " userspace\n");
933                         drm_mode_debug_printmodeline(set->mode);
934                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
935                                                       set->x, set->y,
936                                                       old_fb)) {
937                                 DRM_ERROR("failed to set mode on crtc %p\n",
938                                           set->crtc);
939                                 ret = -EINVAL;
940                                 goto fail;
941                         }
942                         /* TODO are these needed? */
943                         set->crtc->desired_x = set->x;
944                         set->crtc->desired_y = set->y;
945                         set->crtc->desired_mode = set->mode;
946                 }
947                 drm_helper_disable_unused_functions(dev);
948         } else if (fb_changed) {
949                 set->crtc->x = set->x;
950                 set->crtc->y = set->y;
951
952                 old_fb = set->crtc->fb;
953                 if (set->crtc->fb != set->fb)
954                         set->crtc->fb = set->fb;
955                 ret = crtc_funcs->mode_set_base(set->crtc,
956                                                 set->x, set->y, old_fb);
957                 if (ret != 0)
958                         goto fail;
959         }
960
961         kfree(save_connectors);
962         kfree(save_encoders);
963         kfree(save_crtcs);
964         return 0;
965
966 fail:
967         /* Restore all previous data. */
968         count = 0;
969         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
970                 *crtc = save_crtcs[count++];
971         }
972
973         count = 0;
974         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
975                 *encoder = save_encoders[count++];
976         }
977
978         count = 0;
979         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
980                 *connector = save_connectors[count++];
981         }
982
983         kfree(save_connectors);
984         kfree(save_encoders);
985         kfree(save_crtcs);
986         return ret;
987 }
988 EXPORT_SYMBOL(drm_crtc_helper_set_config);
989
990 bool drm_helper_plugged_event(struct drm_device *dev)
991 {
992         DRM_DEBUG_KMS("\n");
993
994         drm_helper_probe_connector_modes(dev, dev->mode_config.max_width,
995                                          dev->mode_config.max_height);
996
997         drm_setup_crtcs(dev);
998
999         /* alert the driver fb layer */
1000         dev->mode_config.funcs->fb_changed(dev);
1001
1002         /* FIXME: send hotplug event */
1003         return true;
1004 }
1005 /**
1006  * drm_initial_config - setup a sane initial connector configuration
1007  * @dev: DRM device
1008  *
1009  * LOCKING:
1010  * Called at init time, must take mode config lock.
1011  *
1012  * Scan the CRTCs and connectors and try to put together an initial setup.
1013  * At the moment, this is a cloned configuration across all heads with
1014  * a new framebuffer object as the backing store.
1015  *
1016  * RETURNS:
1017  * Zero if everything went ok, nonzero otherwise.
1018  */
1019 bool drm_helper_initial_config(struct drm_device *dev)
1020 {
1021         int count = 0;
1022
1023         drm_fb_helper_parse_command_line(dev);
1024
1025         count = drm_helper_probe_connector_modes(dev,
1026                                                  dev->mode_config.max_width,
1027                                                  dev->mode_config.max_height);
1028
1029         /*
1030          * we shouldn't end up with no modes here.
1031          */
1032         WARN(!count, "No connectors reported connected with modes\n");
1033
1034         drm_setup_crtcs(dev);
1035
1036         /* alert the driver fb layer */
1037         dev->mode_config.funcs->fb_changed(dev);
1038
1039         return 0;
1040 }
1041 EXPORT_SYMBOL(drm_helper_initial_config);
1042
1043 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
1044 {
1045         int dpms = DRM_MODE_DPMS_OFF;
1046         struct drm_connector *connector;
1047         struct drm_device *dev = encoder->dev;
1048
1049         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
1050                 if (connector->encoder == encoder)
1051                         if (connector->dpms < dpms)
1052                                 dpms = connector->dpms;
1053         return dpms;
1054 }
1055
1056 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
1057 {
1058         int dpms = DRM_MODE_DPMS_OFF;
1059         struct drm_connector *connector;
1060         struct drm_device *dev = crtc->dev;
1061
1062         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
1063                 if (connector->encoder && connector->encoder->crtc == crtc)
1064                         if (connector->dpms < dpms)
1065                                 dpms = connector->dpms;
1066         return dpms;
1067 }
1068
1069 /**
1070  * drm_helper_connector_dpms
1071  * @connector affected connector
1072  * @mode DPMS mode
1073  *
1074  * Calls the low-level connector DPMS function, then
1075  * calls appropriate encoder and crtc DPMS functions as well
1076  */
1077 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
1078 {
1079         struct drm_encoder *encoder = connector->encoder;
1080         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
1081         int old_dpms;
1082
1083         if (mode == connector->dpms)
1084                 return;
1085
1086         old_dpms = connector->dpms;
1087         connector->dpms = mode;
1088
1089         /* from off to on, do crtc then encoder */
1090         if (mode < old_dpms) {
1091                 if (crtc) {
1092                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
1093                         if (crtc_funcs->dpms)
1094                                 (*crtc_funcs->dpms) (crtc,
1095                                                      drm_helper_choose_crtc_dpms(crtc));
1096                 }
1097                 if (encoder) {
1098                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
1099                         if (encoder_funcs->dpms)
1100                                 (*encoder_funcs->dpms) (encoder,
1101                                                         drm_helper_choose_encoder_dpms(encoder));
1102                 }
1103         }
1104
1105         /* from on to off, do encoder then crtc */
1106         if (mode > old_dpms) {
1107                 if (encoder) {
1108                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
1109                         if (encoder_funcs->dpms)
1110                                 (*encoder_funcs->dpms) (encoder,
1111                                                         drm_helper_choose_encoder_dpms(encoder));
1112                 }
1113                 if (crtc) {
1114                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
1115                         if (crtc_funcs->dpms)
1116                                 (*crtc_funcs->dpms) (crtc,
1117                                                      drm_helper_choose_crtc_dpms(crtc));
1118                 }
1119         }
1120
1121         return;
1122 }
1123 EXPORT_SYMBOL(drm_helper_connector_dpms);
1124
1125 /**
1126  * drm_hotplug_stage_two
1127  * @dev DRM device
1128  * @connector hotpluged connector
1129  *
1130  * LOCKING.
1131  * Caller must hold mode config lock, function might grab struct lock.
1132  *
1133  * Stage two of a hotplug.
1134  *
1135  * RETURNS:
1136  * Zero on success, errno on failure.
1137  */
1138 int drm_helper_hotplug_stage_two(struct drm_device *dev)
1139 {
1140         drm_helper_plugged_event(dev);
1141
1142         return 0;
1143 }
1144 EXPORT_SYMBOL(drm_helper_hotplug_stage_two);
1145
1146 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
1147                                    struct drm_mode_fb_cmd *mode_cmd)
1148 {
1149         fb->width = mode_cmd->width;
1150         fb->height = mode_cmd->height;
1151         fb->pitch = mode_cmd->pitch;
1152         fb->bits_per_pixel = mode_cmd->bpp;
1153         fb->depth = mode_cmd->depth;
1154
1155         return 0;
1156 }
1157 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
1158
1159 int drm_helper_resume_force_mode(struct drm_device *dev)
1160 {
1161         struct drm_crtc *crtc;
1162         int ret;
1163
1164         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1165
1166                 if (!crtc->enabled)
1167                         continue;
1168
1169                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
1170                                                crtc->x, crtc->y, crtc->fb);
1171
1172                 if (ret == false)
1173                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
1174         }
1175         /* disable the unused connectors while restoring the modesetting */
1176         drm_helper_disable_unused_functions(dev);
1177         return 0;
1178 }
1179 EXPORT_SYMBOL(drm_helper_resume_force_mode);