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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 <linux/kernel.h>
33#include <linux/export.h>
34#include <linux/moduleparam.h>
35
36#include <drm/drmP.h>
37#include <drm/drm_crtc.h>
38#include <drm/drm_fourcc.h>
39#include <drm/drm_crtc_helper.h>
40#include <drm/drm_fb_helper.h>
41#include <drm/drm_edid.h>
42
43MODULE_AUTHOR("David Airlie, Jesse Barnes");
44MODULE_DESCRIPTION("DRM KMS helper");
45MODULE_LICENSE("GPL and additional rights");
46
47/**
48 * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
49 * connector list
50 * @dev: drm device to operate on
51 *
52 * Some userspace presumes that the first connected connector is the main
53 * display, where it's supposed to display e.g. the login screen. For
54 * laptops, this should be the main panel. Use this function to sort all
55 * (eDP/LVDS) panels to the front of the connector list, instead of
56 * painstakingly trying to initialize them in the right order.
57 */
58void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
59{
60 struct drm_connector *connector, *tmp;
61 struct list_head panel_list;
62
63 INIT_LIST_HEAD(&panel_list);
64
65 list_for_each_entry_safe(connector, tmp,
66 &dev->mode_config.connector_list, head) {
67 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
68 connector->connector_type == DRM_MODE_CONNECTOR_eDP)
69 list_move_tail(&connector->head, &panel_list);
70 }
71
72 list_splice(&panel_list, &dev->mode_config.connector_list);
73}
74EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
75
76/**
77 * drm_helper_encoder_in_use - check if a given encoder is in use
78 * @encoder: encoder to check
79 *
80 * Checks whether @encoder is with the current mode setting output configuration
81 * in use by any connector. This doesn't mean that it is actually enabled since
82 * the DPMS state is tracked separately.
83 *
84 * Returns:
85 * True if @encoder is used, false otherwise.
86 */
87bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
88{
89 struct drm_connector *connector;
90 struct drm_device *dev = encoder->dev;
91
92 /*
93 * We can expect this mutex to be locked if we are not panicking.
94 * Locking is currently fubar in the panic handler.
95 */
96 if (!oops_in_progress)
97 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
98
99 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
100 if (connector->encoder == encoder)
101 return true;
102 return false;
103}
104EXPORT_SYMBOL(drm_helper_encoder_in_use);
105
106/**
107 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
108 * @crtc: CRTC to check
109 *
110 * Checks whether @crtc is with the current mode setting output configuration
111 * in use by any connector. This doesn't mean that it is actually enabled since
112 * the DPMS state is tracked separately.
113 *
114 * Returns:
115 * True if @crtc is used, false otherwise.
116 */
117bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
118{
119 struct drm_encoder *encoder;
120 struct drm_device *dev = crtc->dev;
121
122 /*
123 * We can expect this mutex to be locked if we are not panicking.
124 * Locking is currently fubar in the panic handler.
125 */
126 if (!oops_in_progress)
127 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
128
129 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
130 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
131 return true;
132 return false;
133}
134EXPORT_SYMBOL(drm_helper_crtc_in_use);
135
136static void
137drm_encoder_disable(struct drm_encoder *encoder)
138{
139 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
140
141 if (encoder->bridge)
142 encoder->bridge->funcs->disable(encoder->bridge);
143
144 if (encoder_funcs->disable)
145 (*encoder_funcs->disable)(encoder);
146 else
147 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
148
149 if (encoder->bridge)
150 encoder->bridge->funcs->post_disable(encoder->bridge);
151}
152
153static void __drm_helper_disable_unused_functions(struct drm_device *dev)
154{
155 struct drm_encoder *encoder;
156 struct drm_connector *connector;
157 struct drm_crtc *crtc;
158
159 drm_warn_on_modeset_not_all_locked(dev);
160
161 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
162 if (!connector->encoder)
163 continue;
164 }
165
166 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
167 if (!drm_helper_encoder_in_use(encoder)) {
168 drm_encoder_disable(encoder);
169 /* disconnector encoder from any connector */
170 encoder->crtc = NULL;
171 }
172 }
173
174 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
175 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
176 crtc->enabled = drm_helper_crtc_in_use(crtc);
177 if (!crtc->enabled) {
178 if (crtc_funcs->disable)
179 (*crtc_funcs->disable)(crtc);
180 else
181 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
182 crtc->primary->fb = NULL;
183 }
184 }
185}
186
187/**
188 * drm_helper_disable_unused_functions - disable unused objects
189 * @dev: DRM device
190 *
191 * This function walks through the entire mode setting configuration of @dev. It
192 * will remove any crtc links of unused encoders and encoder links of
193 * disconnected connectors. Then it will disable all unused encoders and crtcs
194 * either by calling their disable callback if available or by calling their
195 * dpms callback with DRM_MODE_DPMS_OFF.
196 */
197void drm_helper_disable_unused_functions(struct drm_device *dev)
198{
199 drm_modeset_lock_all(dev);
200 __drm_helper_disable_unused_functions(dev);
201 drm_modeset_unlock_all(dev);
202}
203EXPORT_SYMBOL(drm_helper_disable_unused_functions);
204
205/*
206 * Check the CRTC we're going to map each output to vs. its current
207 * CRTC. If they don't match, we have to disable the output and the CRTC
208 * since the driver will have to re-route things.
209 */
210static void
211drm_crtc_prepare_encoders(struct drm_device *dev)
212{
213 struct drm_encoder_helper_funcs *encoder_funcs;
214 struct drm_encoder *encoder;
215
216 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
217 encoder_funcs = encoder->helper_private;
218 /* Disable unused encoders */
219 if (encoder->crtc == NULL)
220 drm_encoder_disable(encoder);
221 /* Disable encoders whose CRTC is about to change */
222 if (encoder_funcs->get_crtc &&
223 encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
224 drm_encoder_disable(encoder);
225 }
226}
227
228/**
229 * drm_crtc_helper_set_mode - internal helper to set a mode
230 * @crtc: CRTC to program
231 * @mode: mode to use
232 * @x: horizontal offset into the surface
233 * @y: vertical offset into the surface
234 * @old_fb: old framebuffer, for cleanup
235 *
236 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
237 * to fixup or reject the mode prior to trying to set it. This is an internal
238 * helper that drivers could e.g. use to update properties that require the
239 * entire output pipe to be disabled and re-enabled in a new configuration. For
240 * example for changing whether audio is enabled on a hdmi link or for changing
241 * panel fitter or dither attributes. It is also called by the
242 * drm_crtc_helper_set_config() helper function to drive the mode setting
243 * sequence.
244 *
245 * Returns:
246 * True if the mode was set successfully, false otherwise.
247 */
248bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
249 struct drm_display_mode *mode,
250 int x, int y,
251 struct drm_framebuffer *old_fb)
252{
253 struct drm_device *dev = crtc->dev;
254 struct drm_display_mode *adjusted_mode, saved_mode;
255 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
256 struct drm_encoder_helper_funcs *encoder_funcs;
257 int saved_x, saved_y;
258 bool saved_enabled;
259 struct drm_encoder *encoder;
260 bool ret = true;
261
262 drm_warn_on_modeset_not_all_locked(dev);
263
264 saved_enabled = crtc->enabled;
265 crtc->enabled = drm_helper_crtc_in_use(crtc);
266 if (!crtc->enabled)
267 return true;
268
269 adjusted_mode = drm_mode_duplicate(dev, mode);
270 if (!adjusted_mode) {
271 crtc->enabled = saved_enabled;
272 return false;
273 }
274
275 saved_mode = crtc->mode;
276 saved_x = crtc->x;
277 saved_y = crtc->y;
278
279 /* Update crtc values up front so the driver can rely on them for mode
280 * setting.
281 */
282 crtc->mode = *mode;
283 crtc->x = x;
284 crtc->y = y;
285
286 /* Pass our mode to the connectors and the CRTC to give them a chance to
287 * adjust it according to limitations or connector properties, and also
288 * a chance to reject the mode entirely.
289 */
290 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
291
292 if (encoder->crtc != crtc)
293 continue;
294
295 if (encoder->bridge && encoder->bridge->funcs->mode_fixup) {
296 ret = encoder->bridge->funcs->mode_fixup(
297 encoder->bridge, mode, adjusted_mode);
298 if (!ret) {
299 DRM_DEBUG_KMS("Bridge fixup failed\n");
300 goto done;
301 }
302 }
303
304 encoder_funcs = encoder->helper_private;
305 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
306 adjusted_mode))) {
307 DRM_DEBUG_KMS("Encoder fixup failed\n");
308 goto done;
309 }
310 }
311
312 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
313 DRM_DEBUG_KMS("CRTC fixup failed\n");
314 goto done;
315 }
316 DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
317
318 /* Prepare the encoders and CRTCs before setting the mode. */
319 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
320
321 if (encoder->crtc != crtc)
322 continue;
323
324 if (encoder->bridge)
325 encoder->bridge->funcs->disable(encoder->bridge);
326
327 encoder_funcs = encoder->helper_private;
328 /* Disable the encoders as the first thing we do. */
329 encoder_funcs->prepare(encoder);
330
331 if (encoder->bridge)
332 encoder->bridge->funcs->post_disable(encoder->bridge);
333 }
334
335 drm_crtc_prepare_encoders(dev);
336
337 crtc_funcs->prepare(crtc);
338
339 /* Set up the DPLL and any encoders state that needs to adjust or depend
340 * on the DPLL.
341 */
342 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
343 if (!ret)
344 goto done;
345
346 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
347
348 if (encoder->crtc != crtc)
349 continue;
350
351 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
352 encoder->base.id, drm_get_encoder_name(encoder),
353 mode->base.id, mode->name);
354 encoder_funcs = encoder->helper_private;
355 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
356
357 if (encoder->bridge && encoder->bridge->funcs->mode_set)
358 encoder->bridge->funcs->mode_set(encoder->bridge, mode,
359 adjusted_mode);
360 }
361
362 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
363 crtc_funcs->commit(crtc);
364
365 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
366
367 if (encoder->crtc != crtc)
368 continue;
369
370 if (encoder->bridge)
371 encoder->bridge->funcs->pre_enable(encoder->bridge);
372
373 encoder_funcs = encoder->helper_private;
374 encoder_funcs->commit(encoder);
375
376 if (encoder->bridge)
377 encoder->bridge->funcs->enable(encoder->bridge);
378 }
379
380 /* Store real post-adjustment hardware mode. */
381 crtc->hwmode = *adjusted_mode;
382
383 /* Calculate and store various constants which
384 * are later needed by vblank and swap-completion
385 * timestamping. They are derived from true hwmode.
386 */
387 drm_calc_timestamping_constants(crtc, &crtc->hwmode);
388
389 /* FIXME: add subpixel order */
390done:
391 drm_mode_destroy(dev, adjusted_mode);
392 if (!ret) {
393 crtc->enabled = saved_enabled;
394 crtc->mode = saved_mode;
395 crtc->x = saved_x;
396 crtc->y = saved_y;
397 }
398
399 return ret;
400}
401EXPORT_SYMBOL(drm_crtc_helper_set_mode);
402
403
404static int
405drm_crtc_helper_disable(struct drm_crtc *crtc)
406{
407 struct drm_device *dev = crtc->dev;
408 struct drm_connector *connector;
409 struct drm_encoder *encoder;
410
411 /* Decouple all encoders and their attached connectors from this crtc */
412 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
413 if (encoder->crtc != crtc)
414 continue;
415
416 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
417 if (connector->encoder != encoder)
418 continue;
419
420 connector->encoder = NULL;
421
422 /*
423 * drm_helper_disable_unused_functions() ought to be
424 * doing this, but since we've decoupled the encoder
425 * from the connector above, the required connection
426 * between them is henceforth no longer available.
427 */
428 connector->dpms = DRM_MODE_DPMS_OFF;
429 }
430 }
431
432 __drm_helper_disable_unused_functions(dev);
433 return 0;
434}
435
436/**
437 * drm_crtc_helper_set_config - set a new config from userspace
438 * @set: mode set configuration
439 *
440 * Setup a new configuration, provided by the upper layers (either an ioctl call
441 * from userspace or internally e.g. from the fbdev support code) in @set, and
442 * enable it. This is the main helper functions for drivers that implement
443 * kernel mode setting with the crtc helper functions and the assorted
444 * ->prepare(), ->modeset() and ->commit() helper callbacks.
445 *
446 * Returns:
447 * Returns 0 on success, negative errno numbers on failure.
448 */
449int drm_crtc_helper_set_config(struct drm_mode_set *set)
450{
451 struct drm_device *dev;
452 struct drm_crtc *new_crtc;
453 struct drm_encoder *save_encoders, *new_encoder, *encoder;
454 bool mode_changed = false; /* if true do a full mode set */
455 bool fb_changed = false; /* if true and !mode_changed just do a flip */
456 struct drm_connector *save_connectors, *connector;
457 int count = 0, ro, fail = 0;
458 struct drm_crtc_helper_funcs *crtc_funcs;
459 struct drm_mode_set save_set;
460 int ret;
461 int i;
462
463 DRM_DEBUG_KMS("\n");
464
465 BUG_ON(!set);
466 BUG_ON(!set->crtc);
467 BUG_ON(!set->crtc->helper_private);
468
469 /* Enforce sane interface api - has been abused by the fb helper. */
470 BUG_ON(!set->mode && set->fb);
471 BUG_ON(set->fb && set->num_connectors == 0);
472
473 crtc_funcs = set->crtc->helper_private;
474
475 if (!set->mode)
476 set->fb = NULL;
477
478 if (set->fb) {
479 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
480 set->crtc->base.id, set->fb->base.id,
481 (int)set->num_connectors, set->x, set->y);
482 } else {
483 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
484 return drm_crtc_helper_disable(set->crtc);
485 }
486
487 dev = set->crtc->dev;
488
489 drm_warn_on_modeset_not_all_locked(dev);
490
491 /*
492 * Allocate space for the backup of all (non-pointer) encoder and
493 * connector data.
494 */
495 save_encoders = kzalloc(dev->mode_config.num_encoder *
496 sizeof(struct drm_encoder), GFP_KERNEL);
497 if (!save_encoders)
498 return -ENOMEM;
499
500 save_connectors = kzalloc(dev->mode_config.num_connector *
501 sizeof(struct drm_connector), GFP_KERNEL);
502 if (!save_connectors) {
503 kfree(save_encoders);
504 return -ENOMEM;
505 }
506
507 /*
508 * Copy data. Note that driver private data is not affected.
509 * Should anything bad happen only the expected state is
510 * restored, not the drivers personal bookkeeping.
511 */
512 count = 0;
513 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
514 save_encoders[count++] = *encoder;
515 }
516
517 count = 0;
518 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
519 save_connectors[count++] = *connector;
520 }
521
522 save_set.crtc = set->crtc;
523 save_set.mode = &set->crtc->mode;
524 save_set.x = set->crtc->x;
525 save_set.y = set->crtc->y;
526 save_set.fb = set->crtc->primary->fb;
527
528 /* We should be able to check here if the fb has the same properties
529 * and then just flip_or_move it */
530 if (set->crtc->primary->fb != set->fb) {
531 /* If we have no fb then treat it as a full mode set */
532 if (set->crtc->primary->fb == NULL) {
533 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
534 mode_changed = true;
535 } else if (set->fb == NULL) {
536 mode_changed = true;
537 } else if (set->fb->pixel_format !=
538 set->crtc->primary->fb->pixel_format) {
539 mode_changed = true;
540 } else
541 fb_changed = true;
542 }
543
544 if (set->x != set->crtc->x || set->y != set->crtc->y)
545 fb_changed = true;
546
547 if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
548 DRM_DEBUG_KMS("modes are different, full mode set\n");
549 drm_mode_debug_printmodeline(&set->crtc->mode);
550 drm_mode_debug_printmodeline(set->mode);
551 mode_changed = true;
552 }
553
554 /* a) traverse passed in connector list and get encoders for them */
555 count = 0;
556 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
557 struct drm_connector_helper_funcs *connector_funcs =
558 connector->helper_private;
559 new_encoder = connector->encoder;
560 for (ro = 0; ro < set->num_connectors; ro++) {
561 if (set->connectors[ro] == connector) {
562 new_encoder = connector_funcs->best_encoder(connector);
563 /* if we can't get an encoder for a connector
564 we are setting now - then fail */
565 if (new_encoder == NULL)
566 /* don't break so fail path works correct */
567 fail = 1;
568
569 if (connector->dpms != DRM_MODE_DPMS_ON) {
570 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
571 mode_changed = true;
572 }
573
574 break;
575 }
576 }
577
578 if (new_encoder != connector->encoder) {
579 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
580 mode_changed = true;
581 /* If the encoder is reused for another connector, then
582 * the appropriate crtc will be set later.
583 */
584 if (connector->encoder)
585 connector->encoder->crtc = NULL;
586 connector->encoder = new_encoder;
587 }
588 }
589
590 if (fail) {
591 ret = -EINVAL;
592 goto fail;
593 }
594
595 count = 0;
596 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
597 if (!connector->encoder)
598 continue;
599
600 if (connector->encoder->crtc == set->crtc)
601 new_crtc = NULL;
602 else
603 new_crtc = connector->encoder->crtc;
604
605 for (ro = 0; ro < set->num_connectors; ro++) {
606 if (set->connectors[ro] == connector)
607 new_crtc = set->crtc;
608 }
609
610 /* Make sure the new CRTC will work with the encoder */
611 if (new_crtc &&
612 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
613 ret = -EINVAL;
614 goto fail;
615 }
616 if (new_crtc != connector->encoder->crtc) {
617 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
618 mode_changed = true;
619 connector->encoder->crtc = new_crtc;
620 }
621 if (new_crtc) {
622 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
623 connector->base.id, drm_get_connector_name(connector),
624 new_crtc->base.id);
625 } else {
626 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
627 connector->base.id, drm_get_connector_name(connector));
628 }
629 }
630
631 /* mode_set_base is not a required function */
632 if (fb_changed && !crtc_funcs->mode_set_base)
633 mode_changed = true;
634
635 if (mode_changed) {
636 if (drm_helper_crtc_in_use(set->crtc)) {
637 DRM_DEBUG_KMS("attempting to set mode from"
638 " userspace\n");
639 drm_mode_debug_printmodeline(set->mode);
640 set->crtc->primary->fb = set->fb;
641 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
642 set->x, set->y,
643 save_set.fb)) {
644 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
645 set->crtc->base.id);
646 set->crtc->primary->fb = save_set.fb;
647 ret = -EINVAL;
648 goto fail;
649 }
650 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
651 for (i = 0; i < set->num_connectors; i++) {
652 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
653 drm_get_connector_name(set->connectors[i]));
654 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
655 }
656 }
657 __drm_helper_disable_unused_functions(dev);
658 } else if (fb_changed) {
659 set->crtc->x = set->x;
660 set->crtc->y = set->y;
661 set->crtc->primary->fb = set->fb;
662 ret = crtc_funcs->mode_set_base(set->crtc,
663 set->x, set->y, save_set.fb);
664 if (ret != 0) {
665 set->crtc->x = save_set.x;
666 set->crtc->y = save_set.y;
667 set->crtc->primary->fb = save_set.fb;
668 goto fail;
669 }
670 }
671
672 kfree(save_connectors);
673 kfree(save_encoders);
674 return 0;
675
676fail:
677 /* Restore all previous data. */
678 count = 0;
679 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
680 *encoder = save_encoders[count++];
681 }
682
683 count = 0;
684 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
685 *connector = save_connectors[count++];
686 }
687
688 /* Try to restore the config */
689 if (mode_changed &&
690 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
691 save_set.y, save_set.fb))
692 DRM_ERROR("failed to restore config after modeset failure\n");
693
694 kfree(save_connectors);
695 kfree(save_encoders);
696 return ret;
697}
698EXPORT_SYMBOL(drm_crtc_helper_set_config);
699
700static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
701{
702 int dpms = DRM_MODE_DPMS_OFF;
703 struct drm_connector *connector;
704 struct drm_device *dev = encoder->dev;
705
706 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
707 if (connector->encoder == encoder)
708 if (connector->dpms < dpms)
709 dpms = connector->dpms;
710 return dpms;
711}
712
713/* Helper which handles bridge ordering around encoder dpms */
714static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
715{
716 struct drm_bridge *bridge = encoder->bridge;
717 struct drm_encoder_helper_funcs *encoder_funcs;
718
719 if (bridge) {
720 if (mode == DRM_MODE_DPMS_ON)
721 bridge->funcs->pre_enable(bridge);
722 else
723 bridge->funcs->disable(bridge);
724 }
725
726 encoder_funcs = encoder->helper_private;
727 if (encoder_funcs->dpms)
728 encoder_funcs->dpms(encoder, mode);
729
730 if (bridge) {
731 if (mode == DRM_MODE_DPMS_ON)
732 bridge->funcs->enable(bridge);
733 else
734 bridge->funcs->post_disable(bridge);
735 }
736}
737
738static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
739{
740 int dpms = DRM_MODE_DPMS_OFF;
741 struct drm_connector *connector;
742 struct drm_device *dev = crtc->dev;
743
744 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
745 if (connector->encoder && connector->encoder->crtc == crtc)
746 if (connector->dpms < dpms)
747 dpms = connector->dpms;
748 return dpms;
749}
750
751/**
752 * drm_helper_connector_dpms() - connector dpms helper implementation
753 * @connector: affected connector
754 * @mode: DPMS mode
755 *
756 * This is the main helper function provided by the crtc helper framework for
757 * implementing the DPMS connector attribute. It computes the new desired DPMS
758 * state for all encoders and crtcs in the output mesh and calls the ->dpms()
759 * callback provided by the driver appropriately.
760 */
761void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
762{
763 struct drm_encoder *encoder = connector->encoder;
764 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
765 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
766
767 if (mode == connector->dpms)
768 return;
769
770 old_dpms = connector->dpms;
771 connector->dpms = mode;
772
773 if (encoder)
774 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
775
776 /* from off to on, do crtc then encoder */
777 if (mode < old_dpms) {
778 if (crtc) {
779 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
780 if (crtc_funcs->dpms)
781 (*crtc_funcs->dpms) (crtc,
782 drm_helper_choose_crtc_dpms(crtc));
783 }
784 if (encoder)
785 drm_helper_encoder_dpms(encoder, encoder_dpms);
786 }
787
788 /* from on to off, do encoder then crtc */
789 if (mode > old_dpms) {
790 if (encoder)
791 drm_helper_encoder_dpms(encoder, encoder_dpms);
792 if (crtc) {
793 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
794 if (crtc_funcs->dpms)
795 (*crtc_funcs->dpms) (crtc,
796 drm_helper_choose_crtc_dpms(crtc));
797 }
798 }
799
800 return;
801}
802EXPORT_SYMBOL(drm_helper_connector_dpms);
803
804/**
805 * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
806 * @fb: drm_framebuffer object to fill out
807 * @mode_cmd: metadata from the userspace fb creation request
808 *
809 * This helper can be used in a drivers fb_create callback to pre-fill the fb's
810 * metadata fields.
811 */
812void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
813 struct drm_mode_fb_cmd2 *mode_cmd)
814{
815 int i;
816
817 fb->width = mode_cmd->width;
818 fb->height = mode_cmd->height;
819 for (i = 0; i < 4; i++) {
820 fb->pitches[i] = mode_cmd->pitches[i];
821 fb->offsets[i] = mode_cmd->offsets[i];
822 }
823 drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
824 &fb->bits_per_pixel);
825 fb->pixel_format = mode_cmd->pixel_format;
826}
827EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
828
829/**
830 * drm_helper_resume_force_mode - force-restore mode setting configuration
831 * @dev: drm_device which should be restored
832 *
833 * Drivers which use the mode setting helpers can use this function to
834 * force-restore the mode setting configuration e.g. on resume or when something
835 * else might have trampled over the hw state (like some overzealous old BIOSen
836 * tended to do).
837 *
838 * This helper doesn't provide a error return value since restoring the old
839 * config should never fail due to resource allocation issues since the driver
840 * has successfully set the restored configuration already. Hence this should
841 * boil down to the equivalent of a few dpms on calls, which also don't provide
842 * an error code.
843 *
844 * Drivers where simply restoring an old configuration again might fail (e.g.
845 * due to slight differences in allocating shared resources when the
846 * configuration is restored in a different order than when userspace set it up)
847 * need to use their own restore logic.
848 */
849void drm_helper_resume_force_mode(struct drm_device *dev)
850{
851 struct drm_crtc *crtc;
852 struct drm_encoder *encoder;
853 struct drm_crtc_helper_funcs *crtc_funcs;
854 int encoder_dpms;
855 bool ret;
856
857 drm_modeset_lock_all(dev);
858 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
859
860 if (!crtc->enabled)
861 continue;
862
863 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
864 crtc->x, crtc->y, crtc->primary->fb);
865
866 /* Restoring the old config should never fail! */
867 if (ret == false)
868 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
869
870 /* Turn off outputs that were already powered off */
871 if (drm_helper_choose_crtc_dpms(crtc)) {
872 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
873
874 if(encoder->crtc != crtc)
875 continue;
876
877 encoder_dpms = drm_helper_choose_encoder_dpms(
878 encoder);
879
880 drm_helper_encoder_dpms(encoder, encoder_dpms);
881 }
882
883 crtc_funcs = crtc->helper_private;
884 if (crtc_funcs->dpms)
885 (*crtc_funcs->dpms) (crtc,
886 drm_helper_choose_crtc_dpms(crtc));
887 }
888 }
889
890 /* disable the unused connectors while restoring the modesetting */
891 __drm_helper_disable_unused_functions(dev);
892 drm_modeset_unlock_all(dev);
893}
894EXPORT_SYMBOL(drm_helper_resume_force_mode);
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 <linux/export.h>
33#include <linux/moduleparam.h>
34
35#include "drmP.h"
36#include "drm_crtc.h"
37#include "drm_fourcc.h"
38#include "drm_crtc_helper.h"
39#include "drm_fb_helper.h"
40#include "drm_edid.h"
41
42static bool drm_kms_helper_poll = true;
43module_param_named(poll, drm_kms_helper_poll, bool, 0600);
44
45static void drm_mode_validate_flag(struct drm_connector *connector,
46 int flags)
47{
48 struct drm_display_mode *mode;
49
50 if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
51 return;
52
53 list_for_each_entry(mode, &connector->modes, head) {
54 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
55 !(flags & DRM_MODE_FLAG_INTERLACE))
56 mode->status = MODE_NO_INTERLACE;
57 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
58 !(flags & DRM_MODE_FLAG_DBLSCAN))
59 mode->status = MODE_NO_DBLESCAN;
60 }
61
62 return;
63}
64
65/**
66 * drm_helper_probe_single_connector_modes - get complete set of display modes
67 * @dev: DRM device
68 * @maxX: max width for modes
69 * @maxY: max height for modes
70 *
71 * LOCKING:
72 * Caller must hold mode config lock.
73 *
74 * Based on @dev's mode_config layout, scan all the connectors and try to detect
75 * modes on them. Modes will first be added to the connector's probed_modes
76 * list, then culled (based on validity and the @maxX, @maxY parameters) and
77 * put into the normal modes list.
78 *
79 * Intended to be used either at bootup time or when major configuration
80 * changes have occurred.
81 *
82 * FIXME: take into account monitor limits
83 *
84 * RETURNS:
85 * Number of modes found on @connector.
86 */
87int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
88 uint32_t maxX, uint32_t maxY)
89{
90 struct drm_device *dev = connector->dev;
91 struct drm_display_mode *mode;
92 struct drm_connector_helper_funcs *connector_funcs =
93 connector->helper_private;
94 int count = 0;
95 int mode_flags = 0;
96
97 DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
98 drm_get_connector_name(connector));
99 /* set all modes to the unverified state */
100 list_for_each_entry(mode, &connector->modes, head)
101 mode->status = MODE_UNVERIFIED;
102
103 if (connector->force) {
104 if (connector->force == DRM_FORCE_ON)
105 connector->status = connector_status_connected;
106 else
107 connector->status = connector_status_disconnected;
108 if (connector->funcs->force)
109 connector->funcs->force(connector);
110 } else {
111 connector->status = connector->funcs->detect(connector, true);
112 drm_kms_helper_poll_enable(dev);
113 }
114
115 if (connector->status == connector_status_disconnected) {
116 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
117 connector->base.id, drm_get_connector_name(connector));
118 drm_mode_connector_update_edid_property(connector, NULL);
119 goto prune;
120 }
121
122#ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
123 count = drm_load_edid_firmware(connector);
124 if (count == 0)
125#endif
126 count = (*connector_funcs->get_modes)(connector);
127
128 if (count == 0 && connector->status == connector_status_connected)
129 count = drm_add_modes_noedid(connector, 1024, 768);
130 if (count == 0)
131 goto prune;
132
133 drm_mode_connector_list_update(connector);
134
135 if (maxX && maxY)
136 drm_mode_validate_size(dev, &connector->modes, maxX,
137 maxY, 0);
138
139 if (connector->interlace_allowed)
140 mode_flags |= DRM_MODE_FLAG_INTERLACE;
141 if (connector->doublescan_allowed)
142 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
143 drm_mode_validate_flag(connector, mode_flags);
144
145 list_for_each_entry(mode, &connector->modes, head) {
146 if (mode->status == MODE_OK)
147 mode->status = connector_funcs->mode_valid(connector,
148 mode);
149 }
150
151prune:
152 drm_mode_prune_invalid(dev, &connector->modes, true);
153
154 if (list_empty(&connector->modes))
155 return 0;
156
157 drm_mode_sort(&connector->modes);
158
159 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
160 drm_get_connector_name(connector));
161 list_for_each_entry(mode, &connector->modes, head) {
162 mode->vrefresh = drm_mode_vrefresh(mode);
163
164 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
165 drm_mode_debug_printmodeline(mode);
166 }
167
168 return count;
169}
170EXPORT_SYMBOL(drm_helper_probe_single_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 */
184bool 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}
193EXPORT_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 */
207bool 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}
217EXPORT_SYMBOL(drm_helper_crtc_in_use);
218
219static void
220drm_encoder_disable(struct drm_encoder *encoder)
221{
222 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
223
224 if (encoder_funcs->disable)
225 (*encoder_funcs->disable)(encoder);
226 else
227 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
228}
229
230/**
231 * drm_helper_disable_unused_functions - disable unused objects
232 * @dev: DRM device
233 *
234 * LOCKING:
235 * Caller must hold mode config lock.
236 *
237 * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
238 * by calling its dpms function, which should power it off.
239 */
240void drm_helper_disable_unused_functions(struct drm_device *dev)
241{
242 struct drm_encoder *encoder;
243 struct drm_connector *connector;
244 struct drm_crtc *crtc;
245
246 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
247 if (!connector->encoder)
248 continue;
249 if (connector->status == connector_status_disconnected)
250 connector->encoder = NULL;
251 }
252
253 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
254 if (!drm_helper_encoder_in_use(encoder)) {
255 drm_encoder_disable(encoder);
256 /* disconnector encoder from any connector */
257 encoder->crtc = NULL;
258 }
259 }
260
261 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
262 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
263 crtc->enabled = drm_helper_crtc_in_use(crtc);
264 if (!crtc->enabled) {
265 if (crtc_funcs->disable)
266 (*crtc_funcs->disable)(crtc);
267 else
268 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
269 crtc->fb = NULL;
270 }
271 }
272}
273EXPORT_SYMBOL(drm_helper_disable_unused_functions);
274
275/**
276 * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
277 * @encoder: encoder to test
278 * @crtc: crtc to test
279 *
280 * Return false if @encoder can't be driven by @crtc, true otherwise.
281 */
282static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
283 struct drm_crtc *crtc)
284{
285 struct drm_device *dev;
286 struct drm_crtc *tmp;
287 int crtc_mask = 1;
288
289 WARN(!crtc, "checking null crtc?\n");
290
291 dev = crtc->dev;
292
293 list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
294 if (tmp == crtc)
295 break;
296 crtc_mask <<= 1;
297 }
298
299 if (encoder->possible_crtcs & crtc_mask)
300 return true;
301 return false;
302}
303
304/*
305 * Check the CRTC we're going to map each output to vs. its current
306 * CRTC. If they don't match, we have to disable the output and the CRTC
307 * since the driver will have to re-route things.
308 */
309static void
310drm_crtc_prepare_encoders(struct drm_device *dev)
311{
312 struct drm_encoder_helper_funcs *encoder_funcs;
313 struct drm_encoder *encoder;
314
315 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
316 encoder_funcs = encoder->helper_private;
317 /* Disable unused encoders */
318 if (encoder->crtc == NULL)
319 drm_encoder_disable(encoder);
320 /* Disable encoders whose CRTC is about to change */
321 if (encoder_funcs->get_crtc &&
322 encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
323 drm_encoder_disable(encoder);
324 }
325}
326
327/**
328 * drm_crtc_set_mode - set a mode
329 * @crtc: CRTC to program
330 * @mode: mode to use
331 * @x: width of mode
332 * @y: height of mode
333 *
334 * LOCKING:
335 * Caller must hold mode config lock.
336 *
337 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
338 * to fixup or reject the mode prior to trying to set it.
339 *
340 * RETURNS:
341 * True if the mode was set successfully, or false otherwise.
342 */
343bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
344 struct drm_display_mode *mode,
345 int x, int y,
346 struct drm_framebuffer *old_fb)
347{
348 struct drm_device *dev = crtc->dev;
349 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
350 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
351 struct drm_encoder_helper_funcs *encoder_funcs;
352 int saved_x, saved_y;
353 struct drm_encoder *encoder;
354 bool ret = true;
355
356 crtc->enabled = drm_helper_crtc_in_use(crtc);
357 if (!crtc->enabled)
358 return true;
359
360 adjusted_mode = drm_mode_duplicate(dev, mode);
361 if (!adjusted_mode)
362 return false;
363
364 saved_hwmode = crtc->hwmode;
365 saved_mode = crtc->mode;
366 saved_x = crtc->x;
367 saved_y = crtc->y;
368
369 /* Update crtc values up front so the driver can rely on them for mode
370 * setting.
371 */
372 crtc->mode = *mode;
373 crtc->x = x;
374 crtc->y = y;
375
376 /* Pass our mode to the connectors and the CRTC to give them a chance to
377 * adjust it according to limitations or connector properties, and also
378 * a chance to reject the mode entirely.
379 */
380 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
381
382 if (encoder->crtc != crtc)
383 continue;
384 encoder_funcs = encoder->helper_private;
385 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
386 adjusted_mode))) {
387 DRM_DEBUG_KMS("Encoder fixup failed\n");
388 goto done;
389 }
390 }
391
392 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
393 DRM_DEBUG_KMS("CRTC fixup failed\n");
394 goto done;
395 }
396 DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
397
398 /* Prepare the encoders and CRTCs before setting the mode. */
399 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
400
401 if (encoder->crtc != crtc)
402 continue;
403 encoder_funcs = encoder->helper_private;
404 /* Disable the encoders as the first thing we do. */
405 encoder_funcs->prepare(encoder);
406 }
407
408 drm_crtc_prepare_encoders(dev);
409
410 crtc_funcs->prepare(crtc);
411
412 /* Set up the DPLL and any encoders state that needs to adjust or depend
413 * on the DPLL.
414 */
415 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
416 if (!ret)
417 goto done;
418
419 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
420
421 if (encoder->crtc != crtc)
422 continue;
423
424 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
425 encoder->base.id, drm_get_encoder_name(encoder),
426 mode->base.id, mode->name);
427 encoder_funcs = encoder->helper_private;
428 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
429 }
430
431 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
432 crtc_funcs->commit(crtc);
433
434 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
435
436 if (encoder->crtc != crtc)
437 continue;
438
439 encoder_funcs = encoder->helper_private;
440 encoder_funcs->commit(encoder);
441
442 }
443
444 /* Store real post-adjustment hardware mode. */
445 crtc->hwmode = *adjusted_mode;
446
447 /* Calculate and store various constants which
448 * are later needed by vblank and swap-completion
449 * timestamping. They are derived from true hwmode.
450 */
451 drm_calc_timestamping_constants(crtc);
452
453 /* FIXME: add subpixel order */
454done:
455 drm_mode_destroy(dev, adjusted_mode);
456 if (!ret) {
457 crtc->hwmode = saved_hwmode;
458 crtc->mode = saved_mode;
459 crtc->x = saved_x;
460 crtc->y = saved_y;
461 }
462
463 return ret;
464}
465EXPORT_SYMBOL(drm_crtc_helper_set_mode);
466
467
468static int
469drm_crtc_helper_disable(struct drm_crtc *crtc)
470{
471 struct drm_device *dev = crtc->dev;
472 struct drm_connector *connector;
473 struct drm_encoder *encoder;
474
475 /* Decouple all encoders and their attached connectors from this crtc */
476 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
477 if (encoder->crtc != crtc)
478 continue;
479
480 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
481 if (connector->encoder != encoder)
482 continue;
483
484 connector->encoder = NULL;
485 }
486 }
487
488 drm_helper_disable_unused_functions(dev);
489 return 0;
490}
491
492/**
493 * drm_crtc_helper_set_config - set a new config from userspace
494 * @crtc: CRTC to setup
495 * @crtc_info: user provided configuration
496 * @new_mode: new mode to set
497 * @connector_set: set of connectors for the new config
498 * @fb: new framebuffer
499 *
500 * LOCKING:
501 * Caller must hold mode config lock.
502 *
503 * Setup a new configuration, provided by the user in @crtc_info, and enable
504 * it.
505 *
506 * RETURNS:
507 * Zero. (FIXME)
508 */
509int drm_crtc_helper_set_config(struct drm_mode_set *set)
510{
511 struct drm_device *dev;
512 struct drm_crtc *save_crtcs, *new_crtc, *crtc;
513 struct drm_encoder *save_encoders, *new_encoder, *encoder;
514 struct drm_framebuffer *old_fb = NULL;
515 bool mode_changed = false; /* if true do a full mode set */
516 bool fb_changed = false; /* if true and !mode_changed just do a flip */
517 struct drm_connector *save_connectors, *connector;
518 int count = 0, ro, fail = 0;
519 struct drm_crtc_helper_funcs *crtc_funcs;
520 struct drm_mode_set save_set;
521 int ret;
522 int i;
523
524 DRM_DEBUG_KMS("\n");
525
526 if (!set)
527 return -EINVAL;
528
529 if (!set->crtc)
530 return -EINVAL;
531
532 if (!set->crtc->helper_private)
533 return -EINVAL;
534
535 crtc_funcs = set->crtc->helper_private;
536
537 if (!set->mode)
538 set->fb = NULL;
539
540 if (set->fb) {
541 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
542 set->crtc->base.id, set->fb->base.id,
543 (int)set->num_connectors, set->x, set->y);
544 } else {
545 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
546 return drm_crtc_helper_disable(set->crtc);
547 }
548
549 dev = set->crtc->dev;
550
551 /* Allocate space for the backup of all (non-pointer) crtc, encoder and
552 * connector data. */
553 save_crtcs = kzalloc(dev->mode_config.num_crtc *
554 sizeof(struct drm_crtc), GFP_KERNEL);
555 if (!save_crtcs)
556 return -ENOMEM;
557
558 save_encoders = kzalloc(dev->mode_config.num_encoder *
559 sizeof(struct drm_encoder), GFP_KERNEL);
560 if (!save_encoders) {
561 kfree(save_crtcs);
562 return -ENOMEM;
563 }
564
565 save_connectors = kzalloc(dev->mode_config.num_connector *
566 sizeof(struct drm_connector), GFP_KERNEL);
567 if (!save_connectors) {
568 kfree(save_crtcs);
569 kfree(save_encoders);
570 return -ENOMEM;
571 }
572
573 /* Copy data. Note that driver private data is not affected.
574 * Should anything bad happen only the expected state is
575 * restored, not the drivers personal bookkeeping.
576 */
577 count = 0;
578 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
579 save_crtcs[count++] = *crtc;
580 }
581
582 count = 0;
583 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
584 save_encoders[count++] = *encoder;
585 }
586
587 count = 0;
588 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
589 save_connectors[count++] = *connector;
590 }
591
592 save_set.crtc = set->crtc;
593 save_set.mode = &set->crtc->mode;
594 save_set.x = set->crtc->x;
595 save_set.y = set->crtc->y;
596 save_set.fb = set->crtc->fb;
597
598 /* We should be able to check here if the fb has the same properties
599 * and then just flip_or_move it */
600 if (set->crtc->fb != set->fb) {
601 /* If we have no fb then treat it as a full mode set */
602 if (set->crtc->fb == NULL) {
603 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
604 mode_changed = true;
605 } else if (set->fb == NULL) {
606 mode_changed = true;
607 } else if (set->fb->depth != set->crtc->fb->depth) {
608 mode_changed = true;
609 } else if (set->fb->bits_per_pixel !=
610 set->crtc->fb->bits_per_pixel) {
611 mode_changed = true;
612 } else
613 fb_changed = true;
614 }
615
616 if (set->x != set->crtc->x || set->y != set->crtc->y)
617 fb_changed = true;
618
619 if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
620 DRM_DEBUG_KMS("modes are different, full mode set\n");
621 drm_mode_debug_printmodeline(&set->crtc->mode);
622 drm_mode_debug_printmodeline(set->mode);
623 mode_changed = true;
624 }
625
626 /* a) traverse passed in connector list and get encoders for them */
627 count = 0;
628 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
629 struct drm_connector_helper_funcs *connector_funcs =
630 connector->helper_private;
631 new_encoder = connector->encoder;
632 for (ro = 0; ro < set->num_connectors; ro++) {
633 if (set->connectors[ro] == connector) {
634 new_encoder = connector_funcs->best_encoder(connector);
635 /* if we can't get an encoder for a connector
636 we are setting now - then fail */
637 if (new_encoder == NULL)
638 /* don't break so fail path works correct */
639 fail = 1;
640 break;
641 }
642 }
643
644 if (new_encoder != connector->encoder) {
645 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
646 mode_changed = true;
647 /* If the encoder is reused for another connector, then
648 * the appropriate crtc will be set later.
649 */
650 if (connector->encoder)
651 connector->encoder->crtc = NULL;
652 connector->encoder = new_encoder;
653 }
654 }
655
656 if (fail) {
657 ret = -EINVAL;
658 goto fail;
659 }
660
661 count = 0;
662 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
663 if (!connector->encoder)
664 continue;
665
666 if (connector->encoder->crtc == set->crtc)
667 new_crtc = NULL;
668 else
669 new_crtc = connector->encoder->crtc;
670
671 for (ro = 0; ro < set->num_connectors; ro++) {
672 if (set->connectors[ro] == connector)
673 new_crtc = set->crtc;
674 }
675
676 /* Make sure the new CRTC will work with the encoder */
677 if (new_crtc &&
678 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
679 ret = -EINVAL;
680 goto fail;
681 }
682 if (new_crtc != connector->encoder->crtc) {
683 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
684 mode_changed = true;
685 connector->encoder->crtc = new_crtc;
686 }
687 if (new_crtc) {
688 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
689 connector->base.id, drm_get_connector_name(connector),
690 new_crtc->base.id);
691 } else {
692 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
693 connector->base.id, drm_get_connector_name(connector));
694 }
695 }
696
697 /* mode_set_base is not a required function */
698 if (fb_changed && !crtc_funcs->mode_set_base)
699 mode_changed = true;
700
701 if (mode_changed) {
702 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
703 if (set->crtc->enabled) {
704 DRM_DEBUG_KMS("attempting to set mode from"
705 " userspace\n");
706 drm_mode_debug_printmodeline(set->mode);
707 old_fb = set->crtc->fb;
708 set->crtc->fb = set->fb;
709 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
710 set->x, set->y,
711 old_fb)) {
712 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
713 set->crtc->base.id);
714 set->crtc->fb = old_fb;
715 ret = -EINVAL;
716 goto fail;
717 }
718 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
719 for (i = 0; i < set->num_connectors; i++) {
720 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
721 drm_get_connector_name(set->connectors[i]));
722 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
723 }
724 }
725 drm_helper_disable_unused_functions(dev);
726 } else if (fb_changed) {
727 set->crtc->x = set->x;
728 set->crtc->y = set->y;
729
730 old_fb = set->crtc->fb;
731 if (set->crtc->fb != set->fb)
732 set->crtc->fb = set->fb;
733 ret = crtc_funcs->mode_set_base(set->crtc,
734 set->x, set->y, old_fb);
735 if (ret != 0) {
736 set->crtc->fb = old_fb;
737 goto fail;
738 }
739 }
740
741 kfree(save_connectors);
742 kfree(save_encoders);
743 kfree(save_crtcs);
744 return 0;
745
746fail:
747 /* Restore all previous data. */
748 count = 0;
749 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
750 *crtc = save_crtcs[count++];
751 }
752
753 count = 0;
754 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
755 *encoder = save_encoders[count++];
756 }
757
758 count = 0;
759 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
760 *connector = save_connectors[count++];
761 }
762
763 /* Try to restore the config */
764 if (mode_changed &&
765 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
766 save_set.y, save_set.fb))
767 DRM_ERROR("failed to restore config after modeset failure\n");
768
769 kfree(save_connectors);
770 kfree(save_encoders);
771 kfree(save_crtcs);
772 return ret;
773}
774EXPORT_SYMBOL(drm_crtc_helper_set_config);
775
776static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
777{
778 int dpms = DRM_MODE_DPMS_OFF;
779 struct drm_connector *connector;
780 struct drm_device *dev = encoder->dev;
781
782 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
783 if (connector->encoder == encoder)
784 if (connector->dpms < dpms)
785 dpms = connector->dpms;
786 return dpms;
787}
788
789static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
790{
791 int dpms = DRM_MODE_DPMS_OFF;
792 struct drm_connector *connector;
793 struct drm_device *dev = crtc->dev;
794
795 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
796 if (connector->encoder && connector->encoder->crtc == crtc)
797 if (connector->dpms < dpms)
798 dpms = connector->dpms;
799 return dpms;
800}
801
802/**
803 * drm_helper_connector_dpms
804 * @connector affected connector
805 * @mode DPMS mode
806 *
807 * Calls the low-level connector DPMS function, then
808 * calls appropriate encoder and crtc DPMS functions as well
809 */
810void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
811{
812 struct drm_encoder *encoder = connector->encoder;
813 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
814 int old_dpms;
815
816 if (mode == connector->dpms)
817 return;
818
819 old_dpms = connector->dpms;
820 connector->dpms = mode;
821
822 /* from off to on, do crtc then encoder */
823 if (mode < old_dpms) {
824 if (crtc) {
825 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
826 if (crtc_funcs->dpms)
827 (*crtc_funcs->dpms) (crtc,
828 drm_helper_choose_crtc_dpms(crtc));
829 }
830 if (encoder) {
831 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
832 if (encoder_funcs->dpms)
833 (*encoder_funcs->dpms) (encoder,
834 drm_helper_choose_encoder_dpms(encoder));
835 }
836 }
837
838 /* from on to off, do encoder then crtc */
839 if (mode > old_dpms) {
840 if (encoder) {
841 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
842 if (encoder_funcs->dpms)
843 (*encoder_funcs->dpms) (encoder,
844 drm_helper_choose_encoder_dpms(encoder));
845 }
846 if (crtc) {
847 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
848 if (crtc_funcs->dpms)
849 (*crtc_funcs->dpms) (crtc,
850 drm_helper_choose_crtc_dpms(crtc));
851 }
852 }
853
854 return;
855}
856EXPORT_SYMBOL(drm_helper_connector_dpms);
857
858int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
859 struct drm_mode_fb_cmd2 *mode_cmd)
860{
861 int i;
862
863 fb->width = mode_cmd->width;
864 fb->height = mode_cmd->height;
865 for (i = 0; i < 4; i++) {
866 fb->pitches[i] = mode_cmd->pitches[i];
867 fb->offsets[i] = mode_cmd->offsets[i];
868 }
869 drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
870 &fb->bits_per_pixel);
871 fb->pixel_format = mode_cmd->pixel_format;
872
873 return 0;
874}
875EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
876
877int drm_helper_resume_force_mode(struct drm_device *dev)
878{
879 struct drm_crtc *crtc;
880 struct drm_encoder *encoder;
881 struct drm_encoder_helper_funcs *encoder_funcs;
882 struct drm_crtc_helper_funcs *crtc_funcs;
883 int ret;
884
885 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
886
887 if (!crtc->enabled)
888 continue;
889
890 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
891 crtc->x, crtc->y, crtc->fb);
892
893 if (ret == false)
894 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
895
896 /* Turn off outputs that were already powered off */
897 if (drm_helper_choose_crtc_dpms(crtc)) {
898 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
899
900 if(encoder->crtc != crtc)
901 continue;
902
903 encoder_funcs = encoder->helper_private;
904 if (encoder_funcs->dpms)
905 (*encoder_funcs->dpms) (encoder,
906 drm_helper_choose_encoder_dpms(encoder));
907 }
908
909 crtc_funcs = crtc->helper_private;
910 if (crtc_funcs->dpms)
911 (*crtc_funcs->dpms) (crtc,
912 drm_helper_choose_crtc_dpms(crtc));
913 }
914 }
915 /* disable the unused connectors while restoring the modesetting */
916 drm_helper_disable_unused_functions(dev);
917 return 0;
918}
919EXPORT_SYMBOL(drm_helper_resume_force_mode);
920
921#define DRM_OUTPUT_POLL_PERIOD (10*HZ)
922static void output_poll_execute(struct work_struct *work)
923{
924 struct delayed_work *delayed_work = to_delayed_work(work);
925 struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
926 struct drm_connector *connector;
927 enum drm_connector_status old_status;
928 bool repoll = false, changed = false;
929
930 if (!drm_kms_helper_poll)
931 return;
932
933 mutex_lock(&dev->mode_config.mutex);
934 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
935
936 /* if this is HPD or polled don't check it -
937 TV out for instance */
938 if (!connector->polled)
939 continue;
940
941 else if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT))
942 repoll = true;
943
944 old_status = connector->status;
945 /* if we are connected and don't want to poll for disconnect
946 skip it */
947 if (old_status == connector_status_connected &&
948 !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT) &&
949 !(connector->polled & DRM_CONNECTOR_POLL_HPD))
950 continue;
951
952 connector->status = connector->funcs->detect(connector, false);
953 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
954 connector->base.id,
955 drm_get_connector_name(connector),
956 old_status, connector->status);
957 if (old_status != connector->status)
958 changed = true;
959 }
960
961 mutex_unlock(&dev->mode_config.mutex);
962
963 if (changed) {
964 /* send a uevent + call fbdev */
965 drm_sysfs_hotplug_event(dev);
966 if (dev->mode_config.funcs->output_poll_changed)
967 dev->mode_config.funcs->output_poll_changed(dev);
968 }
969
970 if (repoll)
971 queue_delayed_work(system_nrt_wq, delayed_work, DRM_OUTPUT_POLL_PERIOD);
972}
973
974void drm_kms_helper_poll_disable(struct drm_device *dev)
975{
976 if (!dev->mode_config.poll_enabled)
977 return;
978 cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
979}
980EXPORT_SYMBOL(drm_kms_helper_poll_disable);
981
982void drm_kms_helper_poll_enable(struct drm_device *dev)
983{
984 bool poll = false;
985 struct drm_connector *connector;
986
987 if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
988 return;
989
990 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
991 if (connector->polled)
992 poll = true;
993 }
994
995 if (poll)
996 queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
997}
998EXPORT_SYMBOL(drm_kms_helper_poll_enable);
999
1000void drm_kms_helper_poll_init(struct drm_device *dev)
1001{
1002 INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
1003 dev->mode_config.poll_enabled = true;
1004
1005 drm_kms_helper_poll_enable(dev);
1006}
1007EXPORT_SYMBOL(drm_kms_helper_poll_init);
1008
1009void drm_kms_helper_poll_fini(struct drm_device *dev)
1010{
1011 drm_kms_helper_poll_disable(dev);
1012}
1013EXPORT_SYMBOL(drm_kms_helper_poll_fini);
1014
1015void drm_helper_hpd_irq_event(struct drm_device *dev)
1016{
1017 if (!dev->mode_config.poll_enabled)
1018 return;
1019
1020 /* kill timer and schedule immediate execution, this doesn't block */
1021 cancel_delayed_work(&dev->mode_config.output_poll_work);
1022 if (drm_kms_helper_poll)
1023 queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, 0);
1024}
1025EXPORT_SYMBOL(drm_helper_hpd_irq_event);