Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[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 /**
46  * drm_helper_probe_connector_modes - get complete set of display modes
47  * @dev: DRM device
48  * @maxX: max width for modes
49  * @maxY: max height for modes
50  *
51  * LOCKING:
52  * Caller must hold mode config lock.
53  *
54  * Based on @dev's mode_config layout, scan all the connectors and try to detect
55  * modes on them.  Modes will first be added to the connector's probed_modes
56  * list, then culled (based on validity and the @maxX, @maxY parameters) and
57  * put into the normal modes list.
58  *
59  * Intended to be used either at bootup time or when major configuration
60  * changes have occurred.
61  *
62  * FIXME: take into account monitor limits
63  *
64  * RETURNS:
65  * Number of modes found on @connector.
66  */
67 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
68                                             uint32_t maxX, uint32_t maxY)
69 {
70         struct drm_device *dev = connector->dev;
71         struct drm_display_mode *mode, *t;
72         struct drm_connector_helper_funcs *connector_funcs =
73                 connector->helper_private;
74         int count = 0;
75
76         DRM_DEBUG("%s\n", drm_get_connector_name(connector));
77         /* set all modes to the unverified state */
78         list_for_each_entry_safe(mode, t, &connector->modes, head)
79                 mode->status = MODE_UNVERIFIED;
80
81         connector->status = connector->funcs->detect(connector);
82
83         if (connector->status == connector_status_disconnected) {
84                 DRM_DEBUG("%s is disconnected\n",
85                           drm_get_connector_name(connector));
86                 /* TODO set EDID to NULL */
87                 return 0;
88         }
89
90         count = (*connector_funcs->get_modes)(connector);
91         if (!count)
92                 return 0;
93
94         drm_mode_connector_list_update(connector);
95
96         if (maxX && maxY)
97                 drm_mode_validate_size(dev, &connector->modes, maxX,
98                                        maxY, 0);
99         list_for_each_entry_safe(mode, t, &connector->modes, head) {
100                 if (mode->status == MODE_OK)
101                         mode->status = connector_funcs->mode_valid(connector,
102                                                                    mode);
103         }
104
105
106         drm_mode_prune_invalid(dev, &connector->modes, true);
107
108         if (list_empty(&connector->modes))
109                 return 0;
110
111         drm_mode_sort(&connector->modes);
112
113         DRM_DEBUG("Probed modes for %s\n", drm_get_connector_name(connector));
114         list_for_each_entry_safe(mode, t, &connector->modes, head) {
115                 mode->vrefresh = drm_mode_vrefresh(mode);
116
117                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
118                 drm_mode_debug_printmodeline(mode);
119         }
120
121         return count;
122 }
123 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
124
125 int drm_helper_probe_connector_modes(struct drm_device *dev, uint32_t maxX,
126                                       uint32_t maxY)
127 {
128         struct drm_connector *connector;
129         int count = 0;
130
131         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
132                 count += drm_helper_probe_single_connector_modes(connector,
133                                                                  maxX, maxY);
134         }
135
136         return count;
137 }
138 EXPORT_SYMBOL(drm_helper_probe_connector_modes);
139
140 static void drm_helper_add_std_modes(struct drm_device *dev,
141                                      struct drm_connector *connector)
142 {
143         struct drm_display_mode *mode, *t;
144         int i;
145
146         for (i = 0; i < ARRAY_SIZE(std_modes); i++) {
147                 struct drm_display_mode *stdmode;
148
149                 /*
150                  * When no valid EDID modes are available we end up
151                  * here and bailed in the past, now we add some standard
152                  * modes and move on.
153                  */
154                 stdmode = drm_mode_duplicate(dev, &std_modes[i]);
155                 drm_mode_probed_add(connector, stdmode);
156                 drm_mode_list_concat(&connector->probed_modes,
157                                      &connector->modes);
158
159                 DRM_DEBUG("Adding mode %s to %s\n", stdmode->name,
160                           drm_get_connector_name(connector));
161         }
162         drm_mode_sort(&connector->modes);
163
164         DRM_DEBUG("Added std modes on %s\n", drm_get_connector_name(connector));
165         list_for_each_entry_safe(mode, t, &connector->modes, head) {
166                 mode->vrefresh = drm_mode_vrefresh(mode);
167
168                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
169                 drm_mode_debug_printmodeline(mode);
170         }
171 }
172
173 /**
174  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
175  * @crtc: CRTC to check
176  *
177  * LOCKING:
178  * Caller must hold mode config lock.
179  *
180  * Walk @crtc's DRM device's mode_config and see if it's in use.
181  *
182  * RETURNS:
183  * True if @crtc is part of the mode_config, false otherwise.
184  */
185 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
186 {
187         struct drm_encoder *encoder;
188         struct drm_device *dev = crtc->dev;
189         /* FIXME: Locking around list access? */
190         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
191                 if (encoder->crtc == crtc)
192                         return true;
193         return false;
194 }
195 EXPORT_SYMBOL(drm_helper_crtc_in_use);
196
197 /**
198  * drm_disable_unused_functions - disable unused objects
199  * @dev: DRM device
200  *
201  * LOCKING:
202  * Caller must hold mode config lock.
203  *
204  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
205  * by calling its dpms function, which should power it off.
206  */
207 void drm_helper_disable_unused_functions(struct drm_device *dev)
208 {
209         struct drm_encoder *encoder;
210         struct drm_encoder_helper_funcs *encoder_funcs;
211         struct drm_crtc *crtc;
212
213         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
214                 encoder_funcs = encoder->helper_private;
215                 if (!encoder->crtc)
216                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
217         }
218
219         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
220                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
221                 crtc->enabled = drm_helper_crtc_in_use(crtc);
222                 if (!crtc->enabled) {
223                         crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
224                         crtc->fb = NULL;
225                 }
226         }
227 }
228 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
229
230 static struct drm_display_mode *drm_has_preferred_mode(struct drm_connector *connector, int width, int height)
231 {
232         struct drm_display_mode *mode;
233
234         list_for_each_entry(mode, &connector->modes, head) {
235                 if (drm_mode_width(mode) > width ||
236                     drm_mode_height(mode) > height)
237                         continue;
238                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
239                         return mode;
240         }
241         return NULL;
242 }
243
244 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
245 {
246         bool enable;
247
248         if (strict) {
249                 enable = connector->status == connector_status_connected;
250         } else {
251                 enable = connector->status != connector_status_disconnected;
252         }
253         return enable;
254 }
255
256 static void drm_enable_connectors(struct drm_device *dev, bool *enabled)
257 {
258         bool any_enabled = false;
259         struct drm_connector *connector;
260         int i = 0;
261
262         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
263                 enabled[i] = drm_connector_enabled(connector, true);
264                 DRM_DEBUG("connector %d enabled? %s\n", connector->base.id,
265                           enabled[i] ? "yes" : "no");
266                 any_enabled |= enabled[i];
267                 i++;
268         }
269
270         if (any_enabled)
271                 return;
272
273         i = 0;
274         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
275                 enabled[i] = drm_connector_enabled(connector, false);
276                 i++;
277         }
278 }
279
280 static bool drm_target_preferred(struct drm_device *dev,
281                                  struct drm_display_mode **modes,
282                                  bool *enabled, int width, int height)
283 {
284         struct drm_connector *connector;
285         int i = 0;
286
287         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
288
289                 if (enabled[i] == false) {
290                         i++;
291                         continue;
292                 }
293
294                 DRM_DEBUG("looking for preferred mode on connector %d\n",
295                           connector->base.id);
296
297                 modes[i] = drm_has_preferred_mode(connector, width, height);
298                 /* No preferred modes, pick one off the list */
299                 if (!modes[i] && !list_empty(&connector->modes)) {
300                         list_for_each_entry(modes[i], &connector->modes, head)
301                                 break;
302                 }
303                 DRM_DEBUG("found mode %s\n", modes[i] ? modes[i]->name :
304                           "none");
305                 i++;
306         }
307         return true;
308 }
309
310 static int drm_pick_crtcs(struct drm_device *dev,
311                           struct drm_crtc **best_crtcs,
312                           struct drm_display_mode **modes,
313                           int n, int width, int height)
314 {
315         int c, o;
316         struct drm_connector *connector;
317         struct drm_connector_helper_funcs *connector_funcs;
318         struct drm_encoder *encoder;
319         struct drm_crtc *best_crtc;
320         int my_score, best_score, score;
321         struct drm_crtc **crtcs, *crtc;
322
323         if (n == dev->mode_config.num_connector)
324                 return 0;
325         c = 0;
326         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
327                 if (c == n)
328                         break;
329                 c++;
330         }
331
332         best_crtcs[n] = NULL;
333         best_crtc = NULL;
334         best_score = drm_pick_crtcs(dev, best_crtcs, modes, n+1, width, height);
335         if (modes[n] == NULL)
336                 return best_score;
337
338         crtcs = kmalloc(dev->mode_config.num_connector *
339                         sizeof(struct drm_crtc *), GFP_KERNEL);
340         if (!crtcs)
341                 return best_score;
342
343         my_score = 1;
344         if (connector->status == connector_status_connected)
345                 my_score++;
346         if (drm_has_preferred_mode(connector, width, height))
347                 my_score++;
348
349         connector_funcs = connector->helper_private;
350         encoder = connector_funcs->best_encoder(connector);
351         if (!encoder)
352                 goto out;
353
354         connector->encoder = encoder;
355
356         /* select a crtc for this connector and then attempt to configure
357            remaining connectors */
358         c = 0;
359         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
360
361                 if ((connector->encoder->possible_crtcs & (1 << c)) == 0) {
362                         c++;
363                         continue;
364                 }
365
366                 for (o = 0; o < n; o++)
367                         if (best_crtcs[o] == crtc)
368                                 break;
369
370                 if (o < n) {
371                         /* ignore cloning for now */
372                         c++;
373                         continue;
374                 }
375
376                 crtcs[n] = crtc;
377                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_crtc *));
378                 score = my_score + drm_pick_crtcs(dev, crtcs, modes, n + 1,
379                                                   width, height);
380                 if (score > best_score) {
381                         best_crtc = crtc;
382                         best_score = score;
383                         memcpy(best_crtcs, crtcs,
384                                dev->mode_config.num_connector *
385                                sizeof(struct drm_crtc *));
386                 }
387                 c++;
388         }
389 out:
390         kfree(crtcs);
391         return best_score;
392 }
393
394 static void drm_setup_crtcs(struct drm_device *dev)
395 {
396         struct drm_crtc **crtcs;
397         struct drm_display_mode **modes;
398         struct drm_encoder *encoder;
399         struct drm_connector *connector;
400         bool *enabled;
401         int width, height;
402         int i, ret;
403
404         DRM_DEBUG("\n");
405
406         width = dev->mode_config.max_width;
407         height = dev->mode_config.max_height;
408
409         /* clean out all the encoder/crtc combos */
410         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
411                 encoder->crtc = NULL;
412         }
413
414         crtcs = kcalloc(dev->mode_config.num_connector,
415                         sizeof(struct drm_crtc *), GFP_KERNEL);
416         modes = kcalloc(dev->mode_config.num_connector,
417                         sizeof(struct drm_display_mode *), GFP_KERNEL);
418         enabled = kcalloc(dev->mode_config.num_connector,
419                           sizeof(bool), GFP_KERNEL);
420
421         drm_enable_connectors(dev, enabled);
422
423         ret = drm_target_preferred(dev, modes, enabled, width, height);
424         if (!ret)
425                 DRM_ERROR("Unable to find initial modes\n");
426
427         DRM_DEBUG("picking CRTCs for %dx%d config\n", width, height);
428
429         drm_pick_crtcs(dev, crtcs, modes, 0, width, height);
430
431         i = 0;
432         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
433                 struct drm_display_mode *mode = modes[i];
434                 struct drm_crtc *crtc = crtcs[i];
435
436                 if (connector->encoder == NULL) {
437                         i++;
438                         continue;
439                 }
440
441                 if (mode && crtc) {
442                         DRM_DEBUG("desired mode %s set on crtc %d\n",
443                                   mode->name, crtc->base.id);
444                         crtc->desired_mode = mode;
445                         connector->encoder->crtc = crtc;
446                 } else
447                         connector->encoder->crtc = NULL;
448                 i++;
449         }
450
451         kfree(crtcs);
452         kfree(modes);
453         kfree(enabled);
454 }
455 /**
456  * drm_crtc_set_mode - set a mode
457  * @crtc: CRTC to program
458  * @mode: mode to use
459  * @x: width of mode
460  * @y: height of mode
461  *
462  * LOCKING:
463  * Caller must hold mode config lock.
464  *
465  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
466  * to fixup or reject the mode prior to trying to set it.
467  *
468  * RETURNS:
469  * True if the mode was set successfully, or false otherwise.
470  */
471 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
472                               struct drm_display_mode *mode,
473                               int x, int y,
474                               struct drm_framebuffer *old_fb)
475 {
476         struct drm_device *dev = crtc->dev;
477         struct drm_display_mode *adjusted_mode, saved_mode;
478         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
479         struct drm_encoder_helper_funcs *encoder_funcs;
480         int saved_x, saved_y;
481         struct drm_encoder *encoder;
482         bool ret = true;
483         bool depth_changed, bpp_changed;
484
485         adjusted_mode = drm_mode_duplicate(dev, mode);
486
487         crtc->enabled = drm_helper_crtc_in_use(crtc);
488
489         if (!crtc->enabled)
490                 return true;
491
492         if (old_fb && crtc->fb) {
493                 depth_changed = (old_fb->depth != crtc->fb->depth);
494                 bpp_changed = (old_fb->bits_per_pixel !=
495                                crtc->fb->bits_per_pixel);
496         } else {
497                 depth_changed = true;
498                 bpp_changed = true;
499         }
500
501         saved_mode = crtc->mode;
502         saved_x = crtc->x;
503         saved_y = crtc->y;
504
505         /* Update crtc values up front so the driver can rely on them for mode
506          * setting.
507          */
508         crtc->mode = *mode;
509         crtc->x = x;
510         crtc->y = y;
511
512         if (drm_mode_equal(&saved_mode, &crtc->mode)) {
513                 if (saved_x != crtc->x || saved_y != crtc->y ||
514                     depth_changed || bpp_changed) {
515                         crtc_funcs->mode_set_base(crtc, crtc->x, crtc->y,
516                                                   old_fb);
517                         goto done;
518                 }
519         }
520
521         /* Pass our mode to the connectors and the CRTC to give them a chance to
522          * adjust it according to limitations or connector properties, and also
523          * a chance to reject the mode entirely.
524          */
525         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
526
527                 if (encoder->crtc != crtc)
528                         continue;
529                 encoder_funcs = encoder->helper_private;
530                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
531                                                       adjusted_mode))) {
532                         goto done;
533                 }
534         }
535
536         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
537                 goto done;
538         }
539
540         /* Prepare the encoders and CRTCs before setting the mode. */
541         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
542
543                 if (encoder->crtc != crtc)
544                         continue;
545                 encoder_funcs = encoder->helper_private;
546                 /* Disable the encoders as the first thing we do. */
547                 encoder_funcs->prepare(encoder);
548         }
549
550         crtc_funcs->prepare(crtc);
551
552         /* Set up the DPLL and any encoders state that needs to adjust or depend
553          * on the DPLL.
554          */
555         crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
556
557         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
558
559                 if (encoder->crtc != crtc)
560                         continue;
561
562                 DRM_INFO("%s: set mode %s %x\n", drm_get_encoder_name(encoder),
563                          mode->name, mode->base.id);
564                 encoder_funcs = encoder->helper_private;
565                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
566         }
567
568         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
569         crtc_funcs->commit(crtc);
570
571         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
572
573                 if (encoder->crtc != crtc)
574                         continue;
575
576                 encoder_funcs = encoder->helper_private;
577                 encoder_funcs->commit(encoder);
578
579         }
580
581         /* XXX free adjustedmode */
582         drm_mode_destroy(dev, adjusted_mode);
583         /* FIXME: add subpixel order */
584 done:
585         if (!ret) {
586                 crtc->mode = saved_mode;
587                 crtc->x = saved_x;
588                 crtc->y = saved_y;
589         }
590
591         return ret;
592 }
593 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
594
595
596 /**
597  * drm_crtc_helper_set_config - set a new config from userspace
598  * @crtc: CRTC to setup
599  * @crtc_info: user provided configuration
600  * @new_mode: new mode to set
601  * @connector_set: set of connectors for the new config
602  * @fb: new framebuffer
603  *
604  * LOCKING:
605  * Caller must hold mode config lock.
606  *
607  * Setup a new configuration, provided by the user in @crtc_info, and enable
608  * it.
609  *
610  * RETURNS:
611  * Zero. (FIXME)
612  */
613 int drm_crtc_helper_set_config(struct drm_mode_set *set)
614 {
615         struct drm_device *dev;
616         struct drm_crtc **save_crtcs, *new_crtc;
617         struct drm_encoder **save_encoders, *new_encoder;
618         struct drm_framebuffer *old_fb;
619         bool save_enabled;
620         bool mode_changed = false;
621         bool fb_changed = false;
622         struct drm_connector *connector;
623         int count = 0, ro, fail = 0;
624         struct drm_crtc_helper_funcs *crtc_funcs;
625         int ret = 0;
626
627         DRM_DEBUG("\n");
628
629         if (!set)
630                 return -EINVAL;
631
632         if (!set->crtc)
633                 return -EINVAL;
634
635         if (!set->crtc->helper_private)
636                 return -EINVAL;
637
638         crtc_funcs = set->crtc->helper_private;
639
640         DRM_DEBUG("crtc: %p %d fb: %p connectors: %p num_connectors: %d (x, y) (%i, %i)\n",
641                   set->crtc, set->crtc->base.id, set->fb, set->connectors,
642                   (int)set->num_connectors, set->x, set->y);
643
644         dev = set->crtc->dev;
645
646         /* save previous config */
647         save_enabled = set->crtc->enabled;
648
649         /*
650          * We do mode_config.num_connectors here since we'll look at the
651          * CRTC and encoder associated with each connector later.
652          */
653         save_crtcs = kzalloc(dev->mode_config.num_connector *
654                              sizeof(struct drm_crtc *), GFP_KERNEL);
655         if (!save_crtcs)
656                 return -ENOMEM;
657
658         save_encoders = kzalloc(dev->mode_config.num_connector *
659                                 sizeof(struct drm_encoders *), GFP_KERNEL);
660         if (!save_encoders) {
661                 kfree(save_crtcs);
662                 return -ENOMEM;
663         }
664
665         /* We should be able to check here if the fb has the same properties
666          * and then just flip_or_move it */
667         if (set->crtc->fb != set->fb) {
668                 /* If we have no fb then treat it as a full mode set */
669                 if (set->crtc->fb == NULL)
670                         mode_changed = true;
671                 else if ((set->fb->bits_per_pixel !=
672                          set->crtc->fb->bits_per_pixel) ||
673                          set->fb->depth != set->crtc->fb->depth)
674                         fb_changed = true;
675                 else
676                         fb_changed = true;
677         }
678
679         if (set->x != set->crtc->x || set->y != set->crtc->y)
680                 fb_changed = true;
681
682         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
683                 DRM_DEBUG("modes are different\n");
684                 drm_mode_debug_printmodeline(&set->crtc->mode);
685                 drm_mode_debug_printmodeline(set->mode);
686                 mode_changed = true;
687         }
688
689         /* a) traverse passed in connector list and get encoders for them */
690         count = 0;
691         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
692                 struct drm_connector_helper_funcs *connector_funcs =
693                         connector->helper_private;
694                 save_encoders[count++] = connector->encoder;
695                 new_encoder = connector->encoder;
696                 for (ro = 0; ro < set->num_connectors; ro++) {
697                         if (set->connectors[ro] == connector) {
698                                 new_encoder = connector_funcs->best_encoder(connector);
699                                 /* if we can't get an encoder for a connector
700                                    we are setting now - then fail */
701                                 if (new_encoder == NULL)
702                                         /* don't break so fail path works correct */
703                                         fail = 1;
704                                 break;
705                         }
706                 }
707
708                 if (new_encoder != connector->encoder) {
709                         mode_changed = true;
710                         connector->encoder = new_encoder;
711                 }
712         }
713
714         if (fail) {
715                 ret = -EINVAL;
716                 goto fail_no_encoder;
717         }
718
719         count = 0;
720         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
721                 if (!connector->encoder)
722                         continue;
723
724                 save_crtcs[count++] = connector->encoder->crtc;
725
726                 if (connector->encoder->crtc == set->crtc)
727                         new_crtc = NULL;
728                 else
729                         new_crtc = connector->encoder->crtc;
730
731                 for (ro = 0; ro < set->num_connectors; ro++) {
732                         if (set->connectors[ro] == connector)
733                                 new_crtc = set->crtc;
734                 }
735                 if (new_crtc != connector->encoder->crtc) {
736                         mode_changed = true;
737                         connector->encoder->crtc = new_crtc;
738                 }
739         }
740
741         /* mode_set_base is not a required function */
742         if (fb_changed && !crtc_funcs->mode_set_base)
743                 mode_changed = true;
744
745         if (mode_changed) {
746                 old_fb = set->crtc->fb;
747                 set->crtc->fb = set->fb;
748                 set->crtc->enabled = (set->mode != NULL);
749                 if (set->mode != NULL) {
750                         DRM_DEBUG("attempting to set mode from userspace\n");
751                         drm_mode_debug_printmodeline(set->mode);
752                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
753                                                       set->x, set->y,
754                                                       old_fb)) {
755                                 ret = -EINVAL;
756                                 goto fail_set_mode;
757                         }
758                         /* TODO are these needed? */
759                         set->crtc->desired_x = set->x;
760                         set->crtc->desired_y = set->y;
761                         set->crtc->desired_mode = set->mode;
762                 }
763                 drm_helper_disable_unused_functions(dev);
764         } else if (fb_changed) {
765                 old_fb = set->crtc->fb;
766                 if (set->crtc->fb != set->fb)
767                         set->crtc->fb = set->fb;
768                 crtc_funcs->mode_set_base(set->crtc, set->x, set->y, old_fb);
769         }
770
771         kfree(save_encoders);
772         kfree(save_crtcs);
773         return 0;
774
775 fail_set_mode:
776         set->crtc->enabled = save_enabled;
777         count = 0;
778         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
779                 connector->encoder->crtc = save_crtcs[count++];
780 fail_no_encoder:
781         kfree(save_crtcs);
782         count = 0;
783         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
784                 connector->encoder = save_encoders[count++];
785         }
786         kfree(save_encoders);
787         return ret;
788 }
789 EXPORT_SYMBOL(drm_crtc_helper_set_config);
790
791 bool drm_helper_plugged_event(struct drm_device *dev)
792 {
793         DRM_DEBUG("\n");
794
795         drm_helper_probe_connector_modes(dev, dev->mode_config.max_width,
796                                          dev->mode_config.max_height);
797
798         drm_setup_crtcs(dev);
799
800         /* alert the driver fb layer */
801         dev->mode_config.funcs->fb_changed(dev);
802
803         /* FIXME: send hotplug event */
804         return true;
805 }
806 /**
807  * drm_initial_config - setup a sane initial connector configuration
808  * @dev: DRM device
809  * @can_grow: this configuration is growable
810  *
811  * LOCKING:
812  * Called at init time, must take mode config lock.
813  *
814  * Scan the CRTCs and connectors and try to put together an initial setup.
815  * At the moment, this is a cloned configuration across all heads with
816  * a new framebuffer object as the backing store.
817  *
818  * RETURNS:
819  * Zero if everything went ok, nonzero otherwise.
820  */
821 bool drm_helper_initial_config(struct drm_device *dev, bool can_grow)
822 {
823         struct drm_connector *connector;
824         int count = 0;
825
826         count = drm_helper_probe_connector_modes(dev,
827                                                  dev->mode_config.max_width,
828                                                  dev->mode_config.max_height);
829
830         /*
831          * None of the available connectors had any modes, so add some
832          * and try to light them up anyway
833          */
834         if (!count) {
835                 DRM_ERROR("connectors have no modes, using standard modes\n");
836                 list_for_each_entry(connector,
837                                     &dev->mode_config.connector_list,
838                                     head)
839                         drm_helper_add_std_modes(dev, connector);
840         }
841
842         drm_setup_crtcs(dev);
843
844         /* alert the driver fb layer */
845         dev->mode_config.funcs->fb_changed(dev);
846
847         return 0;
848 }
849 EXPORT_SYMBOL(drm_helper_initial_config);
850
851 /**
852  * drm_hotplug_stage_two
853  * @dev DRM device
854  * @connector hotpluged connector
855  *
856  * LOCKING.
857  * Caller must hold mode config lock, function might grab struct lock.
858  *
859  * Stage two of a hotplug.
860  *
861  * RETURNS:
862  * Zero on success, errno on failure.
863  */
864 int drm_helper_hotplug_stage_two(struct drm_device *dev)
865 {
866         drm_helper_plugged_event(dev);
867
868         return 0;
869 }
870 EXPORT_SYMBOL(drm_helper_hotplug_stage_two);
871
872 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
873                                    struct drm_mode_fb_cmd *mode_cmd)
874 {
875         fb->width = mode_cmd->width;
876         fb->height = mode_cmd->height;
877         fb->pitch = mode_cmd->pitch;
878         fb->bits_per_pixel = mode_cmd->bpp;
879         fb->depth = mode_cmd->depth;
880
881         return 0;
882 }
883 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
884
885 int drm_helper_resume_force_mode(struct drm_device *dev)
886 {
887         struct drm_crtc *crtc;
888         int ret;
889
890         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
891
892                 if (!crtc->enabled)
893                         continue;
894
895                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
896                                                crtc->x, crtc->y, crtc->fb);
897
898                 if (ret == false)
899                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
900         }
901         return 0;
902 }
903 EXPORT_SYMBOL(drm_helper_resume_force_mode);