Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[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                 drm_mode_connector_update_edid_property(connector, NULL);
108                 goto prune;
109         }
110
111         count = (*connector_funcs->get_modes)(connector);
112         if (!count) {
113                 count = drm_add_modes_noedid(connector, 1024, 768);
114                 if (!count)
115                         return 0;
116         }
117
118         drm_mode_connector_list_update(connector);
119
120         if (maxX && maxY)
121                 drm_mode_validate_size(dev, &connector->modes, maxX,
122                                        maxY, 0);
123
124         if (connector->interlace_allowed)
125                 mode_flags |= DRM_MODE_FLAG_INTERLACE;
126         if (connector->doublescan_allowed)
127                 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
128         drm_mode_validate_flag(connector, mode_flags);
129
130         list_for_each_entry_safe(mode, t, &connector->modes, head) {
131                 if (mode->status == MODE_OK)
132                         mode->status = connector_funcs->mode_valid(connector,
133                                                                    mode);
134         }
135
136 prune:
137         drm_mode_prune_invalid(dev, &connector->modes, true);
138
139         if (list_empty(&connector->modes))
140                 return 0;
141
142         drm_mode_sort(&connector->modes);
143
144         DRM_DEBUG_KMS("Probed modes for %s\n",
145                                 drm_get_connector_name(connector));
146         list_for_each_entry_safe(mode, t, &connector->modes, head) {
147                 mode->vrefresh = drm_mode_vrefresh(mode);
148
149                 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
150                 drm_mode_debug_printmodeline(mode);
151         }
152
153         return count;
154 }
155 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
156
157 int drm_helper_probe_connector_modes(struct drm_device *dev, uint32_t maxX,
158                                       uint32_t maxY)
159 {
160         struct drm_connector *connector;
161         int count = 0;
162
163         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
164                 count += drm_helper_probe_single_connector_modes(connector,
165                                                                  maxX, maxY);
166         }
167
168         return count;
169 }
170 EXPORT_SYMBOL(drm_helper_probe_connector_modes);
171
172 /**
173  * drm_helper_encoder_in_use - check if a given encoder is in use
174  * @encoder: encoder to check
175  *
176  * LOCKING:
177  * Caller must hold mode config lock.
178  *
179  * Walk @encoders's DRM device's mode_config and see if it's in use.
180  *
181  * RETURNS:
182  * True if @encoder is part of the mode_config, false otherwise.
183  */
184 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
185 {
186         struct drm_connector *connector;
187         struct drm_device *dev = encoder->dev;
188         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
189                 if (connector->encoder == encoder)
190                         return true;
191         return false;
192 }
193 EXPORT_SYMBOL(drm_helper_encoder_in_use);
194
195 /**
196  * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
197  * @crtc: CRTC to check
198  *
199  * LOCKING:
200  * Caller must hold mode config lock.
201  *
202  * Walk @crtc's DRM device's mode_config and see if it's in use.
203  *
204  * RETURNS:
205  * True if @crtc is part of the mode_config, false otherwise.
206  */
207 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
208 {
209         struct drm_encoder *encoder;
210         struct drm_device *dev = crtc->dev;
211         /* FIXME: Locking around list access? */
212         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
213                 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
214                         return true;
215         return false;
216 }
217 EXPORT_SYMBOL(drm_helper_crtc_in_use);
218
219 /**
220  * drm_helper_disable_unused_functions - disable unused objects
221  * @dev: DRM device
222  *
223  * LOCKING:
224  * Caller must hold mode config lock.
225  *
226  * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
227  * by calling its dpms function, which should power it off.
228  */
229 void drm_helper_disable_unused_functions(struct drm_device *dev)
230 {
231         struct drm_encoder *encoder;
232         struct drm_connector *connector;
233         struct drm_encoder_helper_funcs *encoder_funcs;
234         struct drm_crtc *crtc;
235
236         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
237                 if (!connector->encoder)
238                         continue;
239                 if (connector->status == connector_status_disconnected)
240                         connector->encoder = NULL;
241         }
242
243         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
244                 encoder_funcs = encoder->helper_private;
245                 if (!drm_helper_encoder_in_use(encoder)) {
246                         if (encoder_funcs->disable)
247                                 (*encoder_funcs->disable)(encoder);
248                         else
249                                 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
250                         /* disconnector encoder from any connector */
251                         encoder->crtc = NULL;
252                 }
253         }
254
255         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
256                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
257                 crtc->enabled = drm_helper_crtc_in_use(crtc);
258                 if (!crtc->enabled) {
259                         crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
260                         crtc->fb = NULL;
261                 }
262         }
263 }
264 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
265
266 static struct drm_display_mode *drm_has_preferred_mode(struct drm_connector *connector, int width, int height)
267 {
268         struct drm_display_mode *mode;
269
270         list_for_each_entry(mode, &connector->modes, head) {
271                 if (drm_mode_width(mode) > width ||
272                     drm_mode_height(mode) > height)
273                         continue;
274                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
275                         return mode;
276         }
277         return NULL;
278 }
279
280 static bool drm_has_cmdline_mode(struct drm_connector *connector)
281 {
282         struct drm_fb_helper_connector *fb_help_conn = connector->fb_helper_private;
283         struct drm_fb_helper_cmdline_mode *cmdline_mode;
284
285         if (!fb_help_conn)
286                 return false;
287
288         cmdline_mode = &fb_help_conn->cmdline_mode;
289         return cmdline_mode->specified;
290 }
291
292 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_connector *connector, int width, int height)
293 {
294         struct drm_fb_helper_connector *fb_help_conn = connector->fb_helper_private;
295         struct drm_fb_helper_cmdline_mode *cmdline_mode;
296         struct drm_display_mode *mode = NULL;
297
298         if (!fb_help_conn)
299                 return mode;
300
301         cmdline_mode = &fb_help_conn->cmdline_mode;
302         if (cmdline_mode->specified == false)
303                 return mode;
304
305         /* attempt to find a matching mode in the list of modes
306          *  we have gotten so far, if not add a CVT mode that conforms
307          */
308         if (cmdline_mode->rb || cmdline_mode->margins)
309                 goto create_mode;
310
311         list_for_each_entry(mode, &connector->modes, head) {
312                 /* check width/height */
313                 if (mode->hdisplay != cmdline_mode->xres ||
314                     mode->vdisplay != cmdline_mode->yres)
315                         continue;
316
317                 if (cmdline_mode->refresh_specified) {
318                         if (mode->vrefresh != cmdline_mode->refresh)
319                                 continue;
320                 }
321
322                 if (cmdline_mode->interlace) {
323                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
324                                 continue;
325                 }
326                 return mode;
327         }
328
329 create_mode:
330         mode = drm_cvt_mode(connector->dev, cmdline_mode->xres,
331                             cmdline_mode->yres,
332                             cmdline_mode->refresh_specified ? cmdline_mode->refresh : 60,
333                             cmdline_mode->rb, cmdline_mode->interlace,
334                             cmdline_mode->margins);
335         drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
336         list_add(&mode->head, &connector->modes);
337         return mode;
338 }
339
340 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
341 {
342         bool enable;
343
344         if (strict) {
345                 enable = connector->status == connector_status_connected;
346         } else {
347                 enable = connector->status != connector_status_disconnected;
348         }
349         return enable;
350 }
351
352 static void drm_enable_connectors(struct drm_device *dev, bool *enabled)
353 {
354         bool any_enabled = false;
355         struct drm_connector *connector;
356         int i = 0;
357
358         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
359                 enabled[i] = drm_connector_enabled(connector, true);
360                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
361                           enabled[i] ? "yes" : "no");
362                 any_enabled |= enabled[i];
363                 i++;
364         }
365
366         if (any_enabled)
367                 return;
368
369         i = 0;
370         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
371                 enabled[i] = drm_connector_enabled(connector, false);
372                 i++;
373         }
374 }
375
376 static bool drm_target_preferred(struct drm_device *dev,
377                                  struct drm_display_mode **modes,
378                                  bool *enabled, int width, int height)
379 {
380         struct drm_connector *connector;
381         int i = 0;
382
383         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
384
385                 if (enabled[i] == false) {
386                         i++;
387                         continue;
388                 }
389
390                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
391                               connector->base.id);
392
393                 /* got for command line mode first */
394                 modes[i] = drm_pick_cmdline_mode(connector, width, height);
395                 if (!modes[i]) {
396                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
397                                       connector->base.id);
398                         modes[i] = drm_has_preferred_mode(connector, width, height);
399                 }
400                 /* No preferred modes, pick one off the list */
401                 if (!modes[i] && !list_empty(&connector->modes)) {
402                         list_for_each_entry(modes[i], &connector->modes, head)
403                                 break;
404                 }
405                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
406                           "none");
407                 i++;
408         }
409         return true;
410 }
411
412 static int drm_pick_crtcs(struct drm_device *dev,
413                           struct drm_crtc **best_crtcs,
414                           struct drm_display_mode **modes,
415                           int n, int width, int height)
416 {
417         int c, o;
418         struct drm_connector *connector;
419         struct drm_connector_helper_funcs *connector_funcs;
420         struct drm_encoder *encoder;
421         struct drm_crtc *best_crtc;
422         int my_score, best_score, score;
423         struct drm_crtc **crtcs, *crtc;
424
425         if (n == dev->mode_config.num_connector)
426                 return 0;
427         c = 0;
428         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
429                 if (c == n)
430                         break;
431                 c++;
432         }
433
434         best_crtcs[n] = NULL;
435         best_crtc = NULL;
436         best_score = drm_pick_crtcs(dev, best_crtcs, modes, n+1, width, height);
437         if (modes[n] == NULL)
438                 return best_score;
439
440         crtcs = kmalloc(dev->mode_config.num_connector *
441                         sizeof(struct drm_crtc *), GFP_KERNEL);
442         if (!crtcs)
443                 return best_score;
444
445         my_score = 1;
446         if (connector->status == connector_status_connected)
447                 my_score++;
448         if (drm_has_cmdline_mode(connector))
449                 my_score++;
450         if (drm_has_preferred_mode(connector, width, height))
451                 my_score++;
452
453         connector_funcs = connector->helper_private;
454         encoder = connector_funcs->best_encoder(connector);
455         if (!encoder)
456                 goto out;
457
458         connector->encoder = encoder;
459
460         /* select a crtc for this connector and then attempt to configure
461            remaining connectors */
462         c = 0;
463         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
464
465                 if ((encoder->possible_crtcs & (1 << c)) == 0) {
466                         c++;
467                         continue;
468                 }
469
470                 for (o = 0; o < n; o++)
471                         if (best_crtcs[o] == crtc)
472                                 break;
473
474                 if (o < n) {
475                         /* ignore cloning for now */
476                         c++;
477                         continue;
478                 }
479
480                 crtcs[n] = crtc;
481                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_crtc *));
482                 score = my_score + drm_pick_crtcs(dev, crtcs, modes, n + 1,
483                                                   width, height);
484                 if (score > best_score) {
485                         best_crtc = crtc;
486                         best_score = score;
487                         memcpy(best_crtcs, crtcs,
488                                dev->mode_config.num_connector *
489                                sizeof(struct drm_crtc *));
490                 }
491                 c++;
492         }
493 out:
494         kfree(crtcs);
495         return best_score;
496 }
497
498 static void drm_setup_crtcs(struct drm_device *dev)
499 {
500         struct drm_crtc **crtcs;
501         struct drm_display_mode **modes;
502         struct drm_encoder *encoder;
503         struct drm_connector *connector;
504         bool *enabled;
505         int width, height;
506         int i, ret;
507
508         DRM_DEBUG_KMS("\n");
509
510         width = dev->mode_config.max_width;
511         height = dev->mode_config.max_height;
512
513         /* clean out all the encoder/crtc combos */
514         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
515                 encoder->crtc = NULL;
516         }
517
518         crtcs = kcalloc(dev->mode_config.num_connector,
519                         sizeof(struct drm_crtc *), GFP_KERNEL);
520         modes = kcalloc(dev->mode_config.num_connector,
521                         sizeof(struct drm_display_mode *), GFP_KERNEL);
522         enabled = kcalloc(dev->mode_config.num_connector,
523                           sizeof(bool), GFP_KERNEL);
524
525         drm_enable_connectors(dev, enabled);
526
527         ret = drm_target_preferred(dev, modes, enabled, width, height);
528         if (!ret)
529                 DRM_ERROR("Unable to find initial modes\n");
530
531         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
532
533         drm_pick_crtcs(dev, crtcs, modes, 0, width, height);
534
535         i = 0;
536         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
537                 struct drm_display_mode *mode = modes[i];
538                 struct drm_crtc *crtc = crtcs[i];
539
540                 if (connector->encoder == NULL) {
541                         i++;
542                         continue;
543                 }
544
545                 if (mode && crtc) {
546                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
547                                   mode->name, crtc->base.id);
548                         crtc->desired_mode = mode;
549                         connector->encoder->crtc = crtc;
550                 } else {
551                         connector->encoder->crtc = NULL;
552                         connector->encoder = NULL;
553                 }
554                 i++;
555         }
556
557         kfree(crtcs);
558         kfree(modes);
559         kfree(enabled);
560 }
561
562 /**
563  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
564  * @encoder: encoder to test
565  * @crtc: crtc to test
566  *
567  * Return false if @encoder can't be driven by @crtc, true otherwise.
568  */
569 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
570                                 struct drm_crtc *crtc)
571 {
572         struct drm_device *dev;
573         struct drm_crtc *tmp;
574         int crtc_mask = 1;
575
576         WARN(!crtc, "checking null crtc?");
577
578         dev = crtc->dev;
579
580         list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
581                 if (tmp == crtc)
582                         break;
583                 crtc_mask <<= 1;
584         }
585
586         if (encoder->possible_crtcs & crtc_mask)
587                 return true;
588         return false;
589 }
590
591 /*
592  * Check the CRTC we're going to map each output to vs. its current
593  * CRTC.  If they don't match, we have to disable the output and the CRTC
594  * since the driver will have to re-route things.
595  */
596 static void
597 drm_crtc_prepare_encoders(struct drm_device *dev)
598 {
599         struct drm_encoder_helper_funcs *encoder_funcs;
600         struct drm_encoder *encoder;
601
602         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
603                 encoder_funcs = encoder->helper_private;
604                 /* Disable unused encoders */
605                 if (encoder->crtc == NULL)
606                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
607                 /* Disable encoders whose CRTC is about to change */
608                 if (encoder_funcs->get_crtc &&
609                     encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
610                         (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
611         }
612 }
613
614 /**
615  * drm_crtc_set_mode - set a mode
616  * @crtc: CRTC to program
617  * @mode: mode to use
618  * @x: width of mode
619  * @y: height of mode
620  *
621  * LOCKING:
622  * Caller must hold mode config lock.
623  *
624  * Try to set @mode on @crtc.  Give @crtc and its associated connectors a chance
625  * to fixup or reject the mode prior to trying to set it.
626  *
627  * RETURNS:
628  * True if the mode was set successfully, or false otherwise.
629  */
630 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
631                               struct drm_display_mode *mode,
632                               int x, int y,
633                               struct drm_framebuffer *old_fb)
634 {
635         struct drm_device *dev = crtc->dev;
636         struct drm_display_mode *adjusted_mode, saved_mode;
637         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
638         struct drm_encoder_helper_funcs *encoder_funcs;
639         int saved_x, saved_y;
640         struct drm_encoder *encoder;
641         bool ret = true;
642
643         adjusted_mode = drm_mode_duplicate(dev, mode);
644
645         crtc->enabled = drm_helper_crtc_in_use(crtc);
646
647         if (!crtc->enabled)
648                 return true;
649
650         saved_mode = crtc->mode;
651         saved_x = crtc->x;
652         saved_y = crtc->y;
653
654         /* Update crtc values up front so the driver can rely on them for mode
655          * setting.
656          */
657         crtc->mode = *mode;
658         crtc->x = x;
659         crtc->y = y;
660
661         /* Pass our mode to the connectors and the CRTC to give them a chance to
662          * adjust it according to limitations or connector properties, and also
663          * a chance to reject the mode entirely.
664          */
665         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
666
667                 if (encoder->crtc != crtc)
668                         continue;
669                 encoder_funcs = encoder->helper_private;
670                 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
671                                                       adjusted_mode))) {
672                         goto done;
673                 }
674         }
675
676         if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
677                 goto done;
678         }
679
680         /* Prepare the encoders and CRTCs before setting the mode. */
681         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
682
683                 if (encoder->crtc != crtc)
684                         continue;
685                 encoder_funcs = encoder->helper_private;
686                 /* Disable the encoders as the first thing we do. */
687                 encoder_funcs->prepare(encoder);
688         }
689
690         drm_crtc_prepare_encoders(dev);
691
692         crtc_funcs->prepare(crtc);
693
694         /* Set up the DPLL and any encoders state that needs to adjust or depend
695          * on the DPLL.
696          */
697         ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
698         if (!ret)
699             goto done;
700
701         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
702
703                 if (encoder->crtc != crtc)
704                         continue;
705
706                 DRM_DEBUG("%s: set mode %s %x\n", drm_get_encoder_name(encoder),
707                          mode->name, mode->base.id);
708                 encoder_funcs = encoder->helper_private;
709                 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
710         }
711
712         /* Now enable the clocks, plane, pipe, and connectors that we set up. */
713         crtc_funcs->commit(crtc);
714
715         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
716
717                 if (encoder->crtc != crtc)
718                         continue;
719
720                 encoder_funcs = encoder->helper_private;
721                 encoder_funcs->commit(encoder);
722
723         }
724
725         /* XXX free adjustedmode */
726         drm_mode_destroy(dev, adjusted_mode);
727         /* FIXME: add subpixel order */
728 done:
729         if (!ret) {
730                 crtc->mode = saved_mode;
731                 crtc->x = saved_x;
732                 crtc->y = saved_y;
733         }
734
735         return ret;
736 }
737 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
738
739
740 /**
741  * drm_crtc_helper_set_config - set a new config from userspace
742  * @crtc: CRTC to setup
743  * @crtc_info: user provided configuration
744  * @new_mode: new mode to set
745  * @connector_set: set of connectors for the new config
746  * @fb: new framebuffer
747  *
748  * LOCKING:
749  * Caller must hold mode config lock.
750  *
751  * Setup a new configuration, provided by the user in @crtc_info, and enable
752  * it.
753  *
754  * RETURNS:
755  * Zero. (FIXME)
756  */
757 int drm_crtc_helper_set_config(struct drm_mode_set *set)
758 {
759         struct drm_device *dev;
760         struct drm_crtc *save_crtcs, *new_crtc, *crtc;
761         struct drm_encoder *save_encoders, *new_encoder, *encoder;
762         struct drm_framebuffer *old_fb = NULL;
763         bool mode_changed = false; /* if true do a full mode set */
764         bool fb_changed = false; /* if true and !mode_changed just do a flip */
765         struct drm_connector *save_connectors, *connector;
766         int count = 0, ro, fail = 0;
767         struct drm_crtc_helper_funcs *crtc_funcs;
768         int ret = 0;
769
770         DRM_DEBUG_KMS("\n");
771
772         if (!set)
773                 return -EINVAL;
774
775         if (!set->crtc)
776                 return -EINVAL;
777
778         if (!set->crtc->helper_private)
779                 return -EINVAL;
780
781         crtc_funcs = set->crtc->helper_private;
782
783         DRM_DEBUG_KMS("crtc: %p %d fb: %p connectors: %p num_connectors:"
784                         " %d (x, y) (%i, %i)\n",
785                   set->crtc, set->crtc->base.id, set->fb, set->connectors,
786                   (int)set->num_connectors, set->x, set->y);
787
788         dev = set->crtc->dev;
789
790         /* Allocate space for the backup of all (non-pointer) crtc, encoder and
791          * connector data. */
792         save_crtcs = kzalloc(dev->mode_config.num_crtc *
793                              sizeof(struct drm_crtc), GFP_KERNEL);
794         if (!save_crtcs)
795                 return -ENOMEM;
796
797         save_encoders = kzalloc(dev->mode_config.num_encoder *
798                                 sizeof(struct drm_encoder), GFP_KERNEL);
799         if (!save_encoders) {
800                 kfree(save_crtcs);
801                 return -ENOMEM;
802         }
803
804         save_connectors = kzalloc(dev->mode_config.num_connector *
805                                 sizeof(struct drm_connector), GFP_KERNEL);
806         if (!save_connectors) {
807                 kfree(save_crtcs);
808                 kfree(save_encoders);
809                 return -ENOMEM;
810         }
811
812         /* Copy data. Note that driver private data is not affected.
813          * Should anything bad happen only the expected state is
814          * restored, not the drivers personal bookkeeping.
815          */
816         count = 0;
817         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
818                 save_crtcs[count++] = *crtc;
819         }
820
821         count = 0;
822         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
823                 save_encoders[count++] = *encoder;
824         }
825
826         count = 0;
827         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
828                 save_connectors[count++] = *connector;
829         }
830
831         /* We should be able to check here if the fb has the same properties
832          * and then just flip_or_move it */
833         if (set->crtc->fb != set->fb) {
834                 /* If we have no fb then treat it as a full mode set */
835                 if (set->crtc->fb == NULL) {
836                         DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
837                         mode_changed = true;
838                 } else if (set->fb == NULL) {
839                         mode_changed = true;
840                 } else
841                         fb_changed = true;
842         }
843
844         if (set->x != set->crtc->x || set->y != set->crtc->y)
845                 fb_changed = true;
846
847         if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
848                 DRM_DEBUG_KMS("modes are different, full mode set\n");
849                 drm_mode_debug_printmodeline(&set->crtc->mode);
850                 drm_mode_debug_printmodeline(set->mode);
851                 mode_changed = true;
852         }
853
854         /* a) traverse passed in connector list and get encoders for them */
855         count = 0;
856         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
857                 struct drm_connector_helper_funcs *connector_funcs =
858                         connector->helper_private;
859                 new_encoder = connector->encoder;
860                 for (ro = 0; ro < set->num_connectors; ro++) {
861                         if (set->connectors[ro] == connector) {
862                                 new_encoder = connector_funcs->best_encoder(connector);
863                                 /* if we can't get an encoder for a connector
864                                    we are setting now - then fail */
865                                 if (new_encoder == NULL)
866                                         /* don't break so fail path works correct */
867                                         fail = 1;
868                                 break;
869                         }
870                 }
871
872                 if (new_encoder != connector->encoder) {
873                         DRM_DEBUG_KMS("encoder changed, full mode switch\n");
874                         mode_changed = true;
875                         /* If the encoder is reused for another connector, then
876                          * the appropriate crtc will be set later.
877                          */
878                         if (connector->encoder)
879                                 connector->encoder->crtc = NULL;
880                         connector->encoder = new_encoder;
881                 }
882         }
883
884         if (fail) {
885                 ret = -EINVAL;
886                 goto fail;
887         }
888
889         count = 0;
890         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
891                 if (!connector->encoder)
892                         continue;
893
894                 if (connector->encoder->crtc == set->crtc)
895                         new_crtc = NULL;
896                 else
897                         new_crtc = connector->encoder->crtc;
898
899                 for (ro = 0; ro < set->num_connectors; ro++) {
900                         if (set->connectors[ro] == connector)
901                                 new_crtc = set->crtc;
902                 }
903
904                 /* Make sure the new CRTC will work with the encoder */
905                 if (new_crtc &&
906                     !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
907                         ret = -EINVAL;
908                         goto fail;
909                 }
910                 if (new_crtc != connector->encoder->crtc) {
911                         DRM_DEBUG_KMS("crtc changed, full mode switch\n");
912                         mode_changed = true;
913                         connector->encoder->crtc = new_crtc;
914                 }
915                 DRM_DEBUG_KMS("setting connector %d crtc to %p\n",
916                           connector->base.id, new_crtc);
917         }
918
919         /* mode_set_base is not a required function */
920         if (fb_changed && !crtc_funcs->mode_set_base)
921                 mode_changed = true;
922
923         if (mode_changed) {
924                 old_fb = set->crtc->fb;
925                 set->crtc->fb = set->fb;
926                 set->crtc->enabled = (set->mode != NULL);
927                 if (set->mode != NULL) {
928                         DRM_DEBUG_KMS("attempting to set mode from"
929                                         " userspace\n");
930                         drm_mode_debug_printmodeline(set->mode);
931                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
932                                                       set->x, set->y,
933                                                       old_fb)) {
934                                 DRM_ERROR("failed to set mode on crtc %p\n",
935                                           set->crtc);
936                                 ret = -EINVAL;
937                                 goto fail;
938                         }
939                         /* TODO are these needed? */
940                         set->crtc->desired_x = set->x;
941                         set->crtc->desired_y = set->y;
942                         set->crtc->desired_mode = set->mode;
943                 }
944                 drm_helper_disable_unused_functions(dev);
945         } else if (fb_changed) {
946                 set->crtc->x = set->x;
947                 set->crtc->y = set->y;
948
949                 old_fb = set->crtc->fb;
950                 if (set->crtc->fb != set->fb)
951                         set->crtc->fb = set->fb;
952                 ret = crtc_funcs->mode_set_base(set->crtc,
953                                                 set->x, set->y, old_fb);
954                 if (ret != 0)
955                         goto fail;
956         }
957
958         kfree(save_connectors);
959         kfree(save_encoders);
960         kfree(save_crtcs);
961         return 0;
962
963 fail:
964         /* Restore all previous data. */
965         count = 0;
966         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
967                 *crtc = save_crtcs[count++];
968         }
969
970         count = 0;
971         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
972                 *encoder = save_encoders[count++];
973         }
974
975         count = 0;
976         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
977                 *connector = save_connectors[count++];
978         }
979
980         kfree(save_connectors);
981         kfree(save_encoders);
982         kfree(save_crtcs);
983         return ret;
984 }
985 EXPORT_SYMBOL(drm_crtc_helper_set_config);
986
987 bool drm_helper_plugged_event(struct drm_device *dev)
988 {
989         DRM_DEBUG_KMS("\n");
990
991         drm_helper_probe_connector_modes(dev, dev->mode_config.max_width,
992                                          dev->mode_config.max_height);
993
994         drm_setup_crtcs(dev);
995
996         /* alert the driver fb layer */
997         dev->mode_config.funcs->fb_changed(dev);
998
999         /* FIXME: send hotplug event */
1000         return true;
1001 }
1002 /**
1003  * drm_initial_config - setup a sane initial connector configuration
1004  * @dev: DRM device
1005  *
1006  * LOCKING:
1007  * Called at init time, must take mode config lock.
1008  *
1009  * Scan the CRTCs and connectors and try to put together an initial setup.
1010  * At the moment, this is a cloned configuration across all heads with
1011  * a new framebuffer object as the backing store.
1012  *
1013  * RETURNS:
1014  * Zero if everything went ok, nonzero otherwise.
1015  */
1016 bool drm_helper_initial_config(struct drm_device *dev)
1017 {
1018         int count = 0;
1019
1020         /* disable all the possible outputs/crtcs before entering KMS mode */
1021         drm_helper_disable_unused_functions(dev);
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         if (count == 0)
1033                 printk(KERN_INFO "No connectors reported connected with modes\n");
1034
1035         drm_setup_crtcs(dev);
1036
1037         /* alert the driver fb layer */
1038         dev->mode_config.funcs->fb_changed(dev);
1039
1040         return 0;
1041 }
1042 EXPORT_SYMBOL(drm_helper_initial_config);
1043
1044 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
1045 {
1046         int dpms = DRM_MODE_DPMS_OFF;
1047         struct drm_connector *connector;
1048         struct drm_device *dev = encoder->dev;
1049
1050         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
1051                 if (connector->encoder == encoder)
1052                         if (connector->dpms < dpms)
1053                                 dpms = connector->dpms;
1054         return dpms;
1055 }
1056
1057 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
1058 {
1059         int dpms = DRM_MODE_DPMS_OFF;
1060         struct drm_connector *connector;
1061         struct drm_device *dev = crtc->dev;
1062
1063         list_for_each_entry(connector, &dev->mode_config.connector_list, head)
1064                 if (connector->encoder && connector->encoder->crtc == crtc)
1065                         if (connector->dpms < dpms)
1066                                 dpms = connector->dpms;
1067         return dpms;
1068 }
1069
1070 /**
1071  * drm_helper_connector_dpms
1072  * @connector affected connector
1073  * @mode DPMS mode
1074  *
1075  * Calls the low-level connector DPMS function, then
1076  * calls appropriate encoder and crtc DPMS functions as well
1077  */
1078 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
1079 {
1080         struct drm_encoder *encoder = connector->encoder;
1081         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
1082         int old_dpms;
1083
1084         if (mode == connector->dpms)
1085                 return;
1086
1087         old_dpms = connector->dpms;
1088         connector->dpms = mode;
1089
1090         /* from off to on, do crtc then encoder */
1091         if (mode < old_dpms) {
1092                 if (crtc) {
1093                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
1094                         if (crtc_funcs->dpms)
1095                                 (*crtc_funcs->dpms) (crtc,
1096                                                      drm_helper_choose_crtc_dpms(crtc));
1097                 }
1098                 if (encoder) {
1099                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
1100                         if (encoder_funcs->dpms)
1101                                 (*encoder_funcs->dpms) (encoder,
1102                                                         drm_helper_choose_encoder_dpms(encoder));
1103                 }
1104         }
1105
1106         /* from on to off, do encoder then crtc */
1107         if (mode > old_dpms) {
1108                 if (encoder) {
1109                         struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
1110                         if (encoder_funcs->dpms)
1111                                 (*encoder_funcs->dpms) (encoder,
1112                                                         drm_helper_choose_encoder_dpms(encoder));
1113                 }
1114                 if (crtc) {
1115                         struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
1116                         if (crtc_funcs->dpms)
1117                                 (*crtc_funcs->dpms) (crtc,
1118                                                      drm_helper_choose_crtc_dpms(crtc));
1119                 }
1120         }
1121
1122         return;
1123 }
1124 EXPORT_SYMBOL(drm_helper_connector_dpms);
1125
1126 /**
1127  * drm_hotplug_stage_two
1128  * @dev DRM device
1129  * @connector hotpluged connector
1130  *
1131  * LOCKING.
1132  * Caller must hold mode config lock, function might grab struct lock.
1133  *
1134  * Stage two of a hotplug.
1135  *
1136  * RETURNS:
1137  * Zero on success, errno on failure.
1138  */
1139 int drm_helper_hotplug_stage_two(struct drm_device *dev)
1140 {
1141         drm_helper_plugged_event(dev);
1142
1143         return 0;
1144 }
1145 EXPORT_SYMBOL(drm_helper_hotplug_stage_two);
1146
1147 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
1148                                    struct drm_mode_fb_cmd *mode_cmd)
1149 {
1150         fb->width = mode_cmd->width;
1151         fb->height = mode_cmd->height;
1152         fb->pitch = mode_cmd->pitch;
1153         fb->bits_per_pixel = mode_cmd->bpp;
1154         fb->depth = mode_cmd->depth;
1155
1156         return 0;
1157 }
1158 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
1159
1160 int drm_helper_resume_force_mode(struct drm_device *dev)
1161 {
1162         struct drm_crtc *crtc;
1163         struct drm_encoder *encoder;
1164         struct drm_encoder_helper_funcs *encoder_funcs;
1165         struct drm_crtc_helper_funcs *crtc_funcs;
1166         int ret;
1167
1168         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1169
1170                 if (!crtc->enabled)
1171                         continue;
1172
1173                 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
1174                                                crtc->x, crtc->y, crtc->fb);
1175
1176                 if (ret == false)
1177                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
1178
1179                 /* Turn off outputs that were already powered off */
1180                 if (drm_helper_choose_crtc_dpms(crtc)) {
1181                         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1182
1183                                 if(encoder->crtc != crtc)
1184                                         continue;
1185
1186                                 encoder_funcs = encoder->helper_private;
1187                                 if (encoder_funcs->dpms)
1188                                         (*encoder_funcs->dpms) (encoder,
1189                                                                 drm_helper_choose_encoder_dpms(encoder));
1190
1191                                 crtc_funcs = crtc->helper_private;
1192                                 if (crtc_funcs->dpms)
1193                                         (*crtc_funcs->dpms) (crtc,
1194                                                              drm_helper_choose_crtc_dpms(crtc));
1195                         }
1196                 }
1197         }
1198         /* disable the unused connectors while restoring the modesetting */
1199         drm_helper_disable_unused_functions(dev);
1200         return 0;
1201 }
1202 EXPORT_SYMBOL(drm_helper_resume_force_mode);