1 // SPDX-License-Identifier: MIT
2 /*
3  * Copyright 2018 Noralf Trønnes
4  * Copyright (c) 2006-2009 Red Hat Inc.
5  * Copyright (c) 2006-2008 Intel Corporation
6  *   Jesse Barnes <jesse.barnes@intel.com>
7  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
8  */
9 
10 #include "drm/drm_modeset_lock.h"
11 #include <linux/module.h>
12 #include <linux/mutex.h>
13 #include <linux/slab.h>
14 #include <linux/string_helpers.h>
15 
16 #include <drm/drm_atomic.h>
17 #include <drm/drm_client.h>
18 #include <drm/drm_connector.h>
19 #include <drm/drm_crtc.h>
20 #include <drm/drm_device.h>
21 #include <drm/drm_drv.h>
22 #include <drm/drm_edid.h>
23 #include <drm/drm_encoder.h>
24 #include <drm/drm_print.h>
25 
26 #include "drm_crtc_internal.h"
27 #include "drm_internal.h"
28 
29 #define DRM_CLIENT_MAX_CLONED_CONNECTORS	8
30 
31 struct drm_client_offset {
32 	int x, y;
33 };
34 
35 int drm_client_modeset_create(struct drm_client_dev *client)
36 {
37 	struct drm_device *dev = client->dev;
38 	unsigned int num_crtc = dev->mode_config.num_crtc;
39 	unsigned int max_connector_count = 1;
40 	struct drm_mode_set *modeset;
41 	struct drm_crtc *crtc;
42 	unsigned int i = 0;
43 
44 	/* Add terminating zero entry to enable index less iteration */
45 	client->modesets = kcalloc(num_crtc + 1, sizeof(*client->modesets), GFP_KERNEL);
46 	if (!client->modesets)
47 		return -ENOMEM;
48 
49 	mutex_init(&client->modeset_mutex);
50 
51 	drm_for_each_crtc(crtc, dev)
52 		client->modesets[i++].crtc = crtc;
53 
54 	/* Cloning is only supported in the single crtc case. */
55 	if (num_crtc == 1)
56 		max_connector_count = DRM_CLIENT_MAX_CLONED_CONNECTORS;
57 
58 	for (modeset = client->modesets; modeset->crtc; modeset++) {
59 		modeset->connectors = kcalloc(max_connector_count,
60 					      sizeof(*modeset->connectors), GFP_KERNEL);
61 		if (!modeset->connectors)
62 			goto err_free;
63 	}
64 
65 	return 0;
66 
67 err_free:
68 	drm_client_modeset_free(client);
69 
70 	return -ENOMEM;
71 }
72 
73 static void drm_client_modeset_release(struct drm_client_dev *client)
74 {
75 	struct drm_mode_set *modeset;
76 	unsigned int i;
77 
78 	drm_client_for_each_modeset(modeset, client) {
79 		drm_mode_destroy(client->dev, modeset->mode);
80 		modeset->mode = NULL;
81 		modeset->fb = NULL;
82 
83 		for (i = 0; i < modeset->num_connectors; i++) {
84 			drm_connector_put(modeset->connectors[i]);
85 			modeset->connectors[i] = NULL;
86 		}
87 		modeset->num_connectors = 0;
88 	}
89 }
90 
91 void drm_client_modeset_free(struct drm_client_dev *client)
92 {
93 	struct drm_mode_set *modeset;
94 
95 	mutex_lock(&client->modeset_mutex);
96 
97 	drm_client_modeset_release(client);
98 
99 	drm_client_for_each_modeset(modeset, client)
100 		kfree(modeset->connectors);
101 
102 	mutex_unlock(&client->modeset_mutex);
103 
104 	mutex_destroy(&client->modeset_mutex);
105 	kfree(client->modesets);
106 }
107 
108 static struct drm_mode_set *
109 drm_client_find_modeset(struct drm_client_dev *client, struct drm_crtc *crtc)
110 {
111 	struct drm_mode_set *modeset;
112 
113 	drm_client_for_each_modeset(modeset, client)
114 		if (modeset->crtc == crtc)
115 			return modeset;
116 
117 	return NULL;
118 }
119 
120 static struct drm_display_mode *
121 drm_connector_get_tiled_mode(struct drm_connector *connector)
122 {
123 	struct drm_display_mode *mode;
124 
125 	list_for_each_entry(mode, &connector->modes, head) {
126 		if (mode->hdisplay == connector->tile_h_size &&
127 		    mode->vdisplay == connector->tile_v_size)
128 			return mode;
129 	}
130 	return NULL;
131 }
132 
133 static struct drm_display_mode *
134 drm_connector_fallback_non_tiled_mode(struct drm_connector *connector)
135 {
136 	struct drm_display_mode *mode;
137 
138 	list_for_each_entry(mode, &connector->modes, head) {
139 		if (mode->hdisplay == connector->tile_h_size &&
140 		    mode->vdisplay == connector->tile_v_size)
141 			continue;
142 		return mode;
143 	}
144 	return NULL;
145 }
146 
147 static struct drm_display_mode *
148 drm_connector_has_preferred_mode(struct drm_connector *connector, int width, int height)
149 {
150 	struct drm_display_mode *mode;
151 
152 	list_for_each_entry(mode, &connector->modes, head) {
153 		if (mode->hdisplay > width ||
154 		    mode->vdisplay > height)
155 			continue;
156 		if (mode->type & DRM_MODE_TYPE_PREFERRED)
157 			return mode;
158 	}
159 	return NULL;
160 }
161 
162 static struct drm_display_mode *drm_connector_pick_cmdline_mode(struct drm_connector *connector)
163 {
164 	struct drm_cmdline_mode *cmdline_mode;
165 	struct drm_display_mode *mode;
166 	bool prefer_non_interlace;
167 
168 	/*
169 	 * Find a user-defined mode. If the user gave us a valid
170 	 * mode on the kernel command line, it will show up in this
171 	 * list.
172 	 */
173 
174 	list_for_each_entry(mode, &connector->modes, head) {
175 		if (mode->type & DRM_MODE_TYPE_USERDEF)
176 			return mode;
177 	}
178 
179 	cmdline_mode = &connector->cmdline_mode;
180 	if (cmdline_mode->specified == false)
181 		return NULL;
182 
183 	/*
184 	 * Attempt to find a matching mode in the list of modes we
185 	 * have gotten so far.
186 	 */
187 
188 	prefer_non_interlace = !cmdline_mode->interlace;
189 again:
190 	list_for_each_entry(mode, &connector->modes, head) {
191 		/* check width/height */
192 		if (mode->hdisplay != cmdline_mode->xres ||
193 		    mode->vdisplay != cmdline_mode->yres)
194 			continue;
195 
196 		if (cmdline_mode->refresh_specified) {
197 			if (drm_mode_vrefresh(mode) != cmdline_mode->refresh)
198 				continue;
199 		}
200 
201 		if (cmdline_mode->interlace) {
202 			if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
203 				continue;
204 		} else if (prefer_non_interlace) {
205 			if (mode->flags & DRM_MODE_FLAG_INTERLACE)
206 				continue;
207 		}
208 		return mode;
209 	}
210 
211 	if (prefer_non_interlace) {
212 		prefer_non_interlace = false;
213 		goto again;
214 	}
215 
216 	return NULL;
217 }
218 
219 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
220 {
221 	bool enable;
222 
223 	if (connector->display_info.non_desktop)
224 		return false;
225 
226 	if (strict)
227 		enable = connector->status == connector_status_connected;
228 	else
229 		enable = connector->status != connector_status_disconnected;
230 
231 	return enable;
232 }
233 
234 static void drm_client_connectors_enabled(struct drm_connector **connectors,
235 					  unsigned int connector_count,
236 					  bool *enabled)
237 {
238 	bool any_enabled = false;
239 	struct drm_connector *connector;
240 	int i = 0;
241 
242 	for (i = 0; i < connector_count; i++) {
243 		connector = connectors[i];
244 		enabled[i] = drm_connector_enabled(connector, true);
245 		DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
246 			      connector->display_info.non_desktop ? "non desktop" : str_yes_no(enabled[i]));
247 
248 		any_enabled |= enabled[i];
249 	}
250 
251 	if (any_enabled)
252 		return;
253 
254 	for (i = 0; i < connector_count; i++)
255 		enabled[i] = drm_connector_enabled(connectors[i], false);
256 }
257 
258 static bool drm_client_target_cloned(struct drm_device *dev,
259 				     struct drm_connector **connectors,
260 				     unsigned int connector_count,
261 				     struct drm_display_mode **modes,
262 				     struct drm_client_offset *offsets,
263 				     bool *enabled, int width, int height)
264 {
265 	int count, i, j;
266 	bool can_clone = false;
267 	struct drm_display_mode *dmt_mode, *mode;
268 
269 	/* only contemplate cloning in the single crtc case */
270 	if (dev->mode_config.num_crtc > 1)
271 		return false;
272 
273 	count = 0;
274 	for (i = 0; i < connector_count; i++) {
275 		if (enabled[i])
276 			count++;
277 	}
278 
279 	/* only contemplate cloning if more than one connector is enabled */
280 	if (count <= 1)
281 		return false;
282 
283 	/* check the command line or if nothing common pick 1024x768 */
284 	can_clone = true;
285 	for (i = 0; i < connector_count; i++) {
286 		if (!enabled[i])
287 			continue;
288 		modes[i] = drm_connector_pick_cmdline_mode(connectors[i]);
289 		if (!modes[i]) {
290 			can_clone = false;
291 			break;
292 		}
293 		for (j = 0; j < i; j++) {
294 			if (!enabled[j])
295 				continue;
296 			if (!drm_mode_match(modes[j], modes[i],
297 					    DRM_MODE_MATCH_TIMINGS |
298 					    DRM_MODE_MATCH_CLOCK |
299 					    DRM_MODE_MATCH_FLAGS |
300 					    DRM_MODE_MATCH_3D_FLAGS))
301 				can_clone = false;
302 		}
303 	}
304 
305 	if (can_clone) {
306 		DRM_DEBUG_KMS("can clone using command line\n");
307 		return true;
308 	}
309 
310 	/* try and find a 1024x768 mode on each connector */
311 	can_clone = true;
312 	dmt_mode = drm_mode_find_dmt(dev, 1024, 768, 60, false);
313 
314 	if (!dmt_mode)
315 		goto fail;
316 
317 	for (i = 0; i < connector_count; i++) {
318 		if (!enabled[i])
319 			continue;
320 
321 		list_for_each_entry(mode, &connectors[i]->modes, head) {
322 			if (drm_mode_match(mode, dmt_mode,
323 					   DRM_MODE_MATCH_TIMINGS |
324 					   DRM_MODE_MATCH_CLOCK |
325 					   DRM_MODE_MATCH_FLAGS |
326 					   DRM_MODE_MATCH_3D_FLAGS))
327 				modes[i] = mode;
328 		}
329 		if (!modes[i])
330 			can_clone = false;
331 	}
332 	kfree(dmt_mode);
333 
334 	if (can_clone) {
335 		DRM_DEBUG_KMS("can clone using 1024x768\n");
336 		return true;
337 	}
338 fail:
339 	DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
340 	return false;
341 }
342 
343 static int drm_client_get_tile_offsets(struct drm_connector **connectors,
344 				       unsigned int connector_count,
345 				       struct drm_display_mode **modes,
346 				       struct drm_client_offset *offsets,
347 				       int idx,
348 				       int h_idx, int v_idx)
349 {
350 	struct drm_connector *connector;
351 	int i;
352 	int hoffset = 0, voffset = 0;
353 
354 	for (i = 0; i < connector_count; i++) {
355 		connector = connectors[i];
356 		if (!connector->has_tile)
357 			continue;
358 
359 		if (!modes[i] && (h_idx || v_idx)) {
360 			DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
361 				      connector->base.id);
362 			continue;
363 		}
364 		if (connector->tile_h_loc < h_idx)
365 			hoffset += modes[i]->hdisplay;
366 
367 		if (connector->tile_v_loc < v_idx)
368 			voffset += modes[i]->vdisplay;
369 	}
370 	offsets[idx].x = hoffset;
371 	offsets[idx].y = voffset;
372 	DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
373 	return 0;
374 }
375 
376 static bool drm_client_target_preferred(struct drm_connector **connectors,
377 					unsigned int connector_count,
378 					struct drm_display_mode **modes,
379 					struct drm_client_offset *offsets,
380 					bool *enabled, int width, int height)
381 {
382 	const u64 mask = BIT_ULL(connector_count) - 1;
383 	struct drm_connector *connector;
384 	u64 conn_configured = 0;
385 	int tile_pass = 0;
386 	int num_tiled_conns = 0;
387 	int i;
388 
389 	for (i = 0; i < connector_count; i++) {
390 		if (connectors[i]->has_tile &&
391 		    connectors[i]->status == connector_status_connected)
392 			num_tiled_conns++;
393 	}
394 
395 retry:
396 	for (i = 0; i < connector_count; i++) {
397 		connector = connectors[i];
398 
399 		if (conn_configured & BIT_ULL(i))
400 			continue;
401 
402 		if (enabled[i] == false) {
403 			conn_configured |= BIT_ULL(i);
404 			continue;
405 		}
406 
407 		/* first pass over all the untiled connectors */
408 		if (tile_pass == 0 && connector->has_tile)
409 			continue;
410 
411 		if (tile_pass == 1) {
412 			if (connector->tile_h_loc != 0 ||
413 			    connector->tile_v_loc != 0)
414 				continue;
415 
416 		} else {
417 			if (connector->tile_h_loc != tile_pass - 1 &&
418 			    connector->tile_v_loc != tile_pass - 1)
419 			/* if this tile_pass doesn't cover any of the tiles - keep going */
420 				continue;
421 
422 			/*
423 			 * find the tile offsets for this pass - need to find
424 			 * all tiles left and above
425 			 */
426 			drm_client_get_tile_offsets(connectors, connector_count, modes, offsets, i,
427 						    connector->tile_h_loc, connector->tile_v_loc);
428 		}
429 		DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
430 			      connector->base.id);
431 
432 		/* got for command line mode first */
433 		modes[i] = drm_connector_pick_cmdline_mode(connector);
434 		if (!modes[i]) {
435 			DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
436 				      connector->base.id, connector->tile_group ? connector->tile_group->id : 0);
437 			modes[i] = drm_connector_has_preferred_mode(connector, width, height);
438 		}
439 		/* No preferred modes, pick one off the list */
440 		if (!modes[i] && !list_empty(&connector->modes)) {
441 			list_for_each_entry(modes[i], &connector->modes, head)
442 				break;
443 		}
444 		/*
445 		 * In case of tiled mode if all tiles not present fallback to
446 		 * first available non tiled mode.
447 		 * After all tiles are present, try to find the tiled mode
448 		 * for all and if tiled mode not present due to fbcon size
449 		 * limitations, use first non tiled mode only for
450 		 * tile 0,0 and set to no mode for all other tiles.
451 		 */
452 		if (connector->has_tile) {
453 			if (num_tiled_conns <
454 			    connector->num_h_tile * connector->num_v_tile ||
455 			    (connector->tile_h_loc == 0 &&
456 			     connector->tile_v_loc == 0 &&
457 			     !drm_connector_get_tiled_mode(connector))) {
458 				DRM_DEBUG_KMS("Falling back to non tiled mode on Connector %d\n",
459 					      connector->base.id);
460 				modes[i] = drm_connector_fallback_non_tiled_mode(connector);
461 			} else {
462 				modes[i] = drm_connector_get_tiled_mode(connector);
463 			}
464 		}
465 
466 		DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
467 			  "none");
468 		conn_configured |= BIT_ULL(i);
469 	}
470 
471 	if ((conn_configured & mask) != mask) {
472 		tile_pass++;
473 		goto retry;
474 	}
475 	return true;
476 }
477 
478 static bool connector_has_possible_crtc(struct drm_connector *connector,
479 					struct drm_crtc *crtc)
480 {
481 	struct drm_encoder *encoder;
482 
483 	drm_connector_for_each_possible_encoder(connector, encoder) {
484 		if (encoder->possible_crtcs & drm_crtc_mask(crtc))
485 			return true;
486 	}
487 
488 	return false;
489 }
490 
491 static int drm_client_pick_crtcs(struct drm_client_dev *client,
492 				 struct drm_connector **connectors,
493 				 unsigned int connector_count,
494 				 struct drm_crtc **best_crtcs,
495 				 struct drm_display_mode **modes,
496 				 int n, int width, int height)
497 {
498 	struct drm_device *dev = client->dev;
499 	struct drm_connector *connector;
500 	int my_score, best_score, score;
501 	struct drm_crtc **crtcs, *crtc;
502 	struct drm_mode_set *modeset;
503 	int o;
504 
505 	if (n == connector_count)
506 		return 0;
507 
508 	connector = connectors[n];
509 
510 	best_crtcs[n] = NULL;
511 	best_score = drm_client_pick_crtcs(client, connectors, connector_count,
512 					   best_crtcs, modes, n + 1, width, height);
513 	if (modes[n] == NULL)
514 		return best_score;
515 
516 	crtcs = kcalloc(connector_count, sizeof(*crtcs), GFP_KERNEL);
517 	if (!crtcs)
518 		return best_score;
519 
520 	my_score = 1;
521 	if (connector->status == connector_status_connected)
522 		my_score++;
523 	if (connector->cmdline_mode.specified)
524 		my_score++;
525 	if (drm_connector_has_preferred_mode(connector, width, height))
526 		my_score++;
527 
528 	/*
529 	 * select a crtc for this connector and then attempt to configure
530 	 * remaining connectors
531 	 */
532 	drm_client_for_each_modeset(modeset, client) {
533 		crtc = modeset->crtc;
534 
535 		if (!connector_has_possible_crtc(connector, crtc))
536 			continue;
537 
538 		for (o = 0; o < n; o++)
539 			if (best_crtcs[o] == crtc)
540 				break;
541 
542 		if (o < n) {
543 			/* ignore cloning unless only a single crtc */
544 			if (dev->mode_config.num_crtc > 1)
545 				continue;
546 
547 			if (!drm_mode_equal(modes[o], modes[n]))
548 				continue;
549 		}
550 
551 		crtcs[n] = crtc;
552 		memcpy(crtcs, best_crtcs, n * sizeof(*crtcs));
553 		score = my_score + drm_client_pick_crtcs(client, connectors, connector_count,
554 							 crtcs, modes, n + 1, width, height);
555 		if (score > best_score) {
556 			best_score = score;
557 			memcpy(best_crtcs, crtcs, connector_count * sizeof(*crtcs));
558 		}
559 	}
560 
561 	kfree(crtcs);
562 	return best_score;
563 }
564 
565 /* Try to read the BIOS display configuration and use it for the initial config */
566 static bool drm_client_firmware_config(struct drm_client_dev *client,
567 				       struct drm_connector **connectors,
568 				       unsigned int connector_count,
569 				       struct drm_crtc **crtcs,
570 				       struct drm_display_mode **modes,
571 				       struct drm_client_offset *offsets,
572 				       bool *enabled, int width, int height)
573 {
574 	const int count = min_t(unsigned int, connector_count, BITS_PER_LONG);
575 	unsigned long conn_configured, conn_seq, mask;
576 	struct drm_device *dev = client->dev;
577 	int i, j;
578 	bool *save_enabled;
579 	bool fallback = true, ret = true;
580 	int num_connectors_enabled = 0;
581 	int num_connectors_detected = 0;
582 	int num_tiled_conns = 0;
583 	struct drm_modeset_acquire_ctx ctx;
584 
585 	if (!drm_drv_uses_atomic_modeset(dev))
586 		return false;
587 
588 	if (WARN_ON(count <= 0))
589 		return false;
590 
591 	save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL);
592 	if (!save_enabled)
593 		return false;
594 
595 	drm_modeset_acquire_init(&ctx, 0);
596 
597 	while (drm_modeset_lock_all_ctx(dev, &ctx) != 0)
598 		drm_modeset_backoff(&ctx);
599 
600 	memcpy(save_enabled, enabled, count);
601 	mask = GENMASK(count - 1, 0);
602 	conn_configured = 0;
603 	for (i = 0; i < count; i++) {
604 		if (connectors[i]->has_tile &&
605 		    connectors[i]->status == connector_status_connected)
606 			num_tiled_conns++;
607 	}
608 retry:
609 	conn_seq = conn_configured;
610 	for (i = 0; i < count; i++) {
611 		struct drm_connector *connector;
612 		struct drm_encoder *encoder;
613 		struct drm_crtc *new_crtc;
614 
615 		connector = connectors[i];
616 
617 		if (conn_configured & BIT(i))
618 			continue;
619 
620 		if (conn_seq == 0 && !connector->has_tile)
621 			continue;
622 
623 		if (connector->status == connector_status_connected)
624 			num_connectors_detected++;
625 
626 		if (!enabled[i]) {
627 			DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
628 				      connector->name);
629 			conn_configured |= BIT(i);
630 			continue;
631 		}
632 
633 		if (connector->force == DRM_FORCE_OFF) {
634 			DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
635 				      connector->name);
636 			enabled[i] = false;
637 			continue;
638 		}
639 
640 		encoder = connector->state->best_encoder;
641 		if (!encoder || WARN_ON(!connector->state->crtc)) {
642 			if (connector->force > DRM_FORCE_OFF)
643 				goto bail;
644 
645 			DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
646 				      connector->name);
647 			enabled[i] = false;
648 			conn_configured |= BIT(i);
649 			continue;
650 		}
651 
652 		num_connectors_enabled++;
653 
654 		new_crtc = connector->state->crtc;
655 
656 		/*
657 		 * Make sure we're not trying to drive multiple connectors
658 		 * with a single CRTC, since our cloning support may not
659 		 * match the BIOS.
660 		 */
661 		for (j = 0; j < count; j++) {
662 			if (crtcs[j] == new_crtc) {
663 				DRM_DEBUG_KMS("fallback: cloned configuration\n");
664 				goto bail;
665 			}
666 		}
667 
668 		DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
669 			      connector->name);
670 
671 		/* go for command line mode first */
672 		modes[i] = drm_connector_pick_cmdline_mode(connector);
673 
674 		/* try for preferred next */
675 		if (!modes[i]) {
676 			DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
677 				      connector->name, connector->has_tile);
678 			modes[i] = drm_connector_has_preferred_mode(connector, width, height);
679 		}
680 
681 		/* No preferred mode marked by the EDID? Are there any modes? */
682 		if (!modes[i] && !list_empty(&connector->modes)) {
683 			DRM_DEBUG_KMS("using first mode listed on connector %s\n",
684 				      connector->name);
685 			modes[i] = list_first_entry(&connector->modes,
686 						    struct drm_display_mode,
687 						    head);
688 		}
689 
690 		/* last resort: use current mode */
691 		if (!modes[i]) {
692 			/*
693 			 * IMPORTANT: We want to use the adjusted mode (i.e.
694 			 * after the panel fitter upscaling) as the initial
695 			 * config, not the input mode, which is what crtc->mode
696 			 * usually contains. But since our current
697 			 * code puts a mode derived from the post-pfit timings
698 			 * into crtc->mode this works out correctly.
699 			 *
700 			 * This is crtc->mode and not crtc->state->mode for the
701 			 * fastboot check to work correctly.
702 			 */
703 			DRM_DEBUG_KMS("looking for current mode on connector %s\n",
704 				      connector->name);
705 			modes[i] = &connector->state->crtc->mode;
706 		}
707 		/*
708 		 * In case of tiled modes, if all tiles are not present
709 		 * then fallback to a non tiled mode.
710 		 */
711 		if (connector->has_tile &&
712 		    num_tiled_conns < connector->num_h_tile * connector->num_v_tile) {
713 			DRM_DEBUG_KMS("Falling back to non tiled mode on Connector %d\n",
714 				      connector->base.id);
715 			modes[i] = drm_connector_fallback_non_tiled_mode(connector);
716 		}
717 		crtcs[i] = new_crtc;
718 
719 		DRM_DEBUG_KMS("connector %s on [CRTC:%d:%s]: %dx%d%s\n",
720 			      connector->name,
721 			      connector->state->crtc->base.id,
722 			      connector->state->crtc->name,
723 			      modes[i]->hdisplay, modes[i]->vdisplay,
724 			      modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" : "");
725 
726 		fallback = false;
727 		conn_configured |= BIT(i);
728 	}
729 
730 	if ((conn_configured & mask) != mask && conn_configured != conn_seq)
731 		goto retry;
732 
733 	/*
734 	 * If the BIOS didn't enable everything it could, fall back to have the
735 	 * same user experiencing of lighting up as much as possible like the
736 	 * fbdev helper library.
737 	 */
738 	if (num_connectors_enabled != num_connectors_detected &&
739 	    num_connectors_enabled < dev->mode_config.num_crtc) {
740 		DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
741 		DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
742 			      num_connectors_detected);
743 		fallback = true;
744 	}
745 
746 	if (fallback) {
747 bail:
748 		DRM_DEBUG_KMS("Not using firmware configuration\n");
749 		memcpy(enabled, save_enabled, count);
750 		ret = false;
751 	}
752 
753 	drm_modeset_drop_locks(&ctx);
754 	drm_modeset_acquire_fini(&ctx);
755 
756 	kfree(save_enabled);
757 	return ret;
758 }
759 
760 /**
761  * drm_client_modeset_probe() - Probe for displays
762  * @client: DRM client
763  * @width: Maximum display mode width (optional)
764  * @height: Maximum display mode height (optional)
765  *
766  * This function sets up display pipelines for enabled connectors and stores the
767  * config in the client's modeset array.
768  *
769  * Returns:
770  * Zero on success or negative error code on failure.
771  */
772 int drm_client_modeset_probe(struct drm_client_dev *client, unsigned int width, unsigned int height)
773 {
774 	struct drm_connector *connector, **connectors = NULL;
775 	struct drm_connector_list_iter conn_iter;
776 	struct drm_device *dev = client->dev;
777 	unsigned int total_modes_count = 0;
778 	struct drm_client_offset *offsets;
779 	unsigned int connector_count = 0;
780 	/* points to modes protected by mode_config.mutex */
781 	struct drm_display_mode **modes;
782 	struct drm_crtc **crtcs;
783 	int i, ret = 0;
784 	bool *enabled;
785 
786 	DRM_DEBUG_KMS("\n");
787 
788 	if (!width)
789 		width = dev->mode_config.max_width;
790 	if (!height)
791 		height = dev->mode_config.max_height;
792 
793 	drm_connector_list_iter_begin(dev, &conn_iter);
794 	drm_client_for_each_connector_iter(connector, &conn_iter) {
795 		struct drm_connector **tmp;
796 
797 		tmp = krealloc(connectors, (connector_count + 1) * sizeof(*connectors), GFP_KERNEL);
798 		if (!tmp) {
799 			ret = -ENOMEM;
800 			goto free_connectors;
801 		}
802 
803 		connectors = tmp;
804 		drm_connector_get(connector);
805 		connectors[connector_count++] = connector;
806 	}
807 	drm_connector_list_iter_end(&conn_iter);
808 
809 	if (!connector_count)
810 		return 0;
811 
812 	crtcs = kcalloc(connector_count, sizeof(*crtcs), GFP_KERNEL);
813 	modes = kcalloc(connector_count, sizeof(*modes), GFP_KERNEL);
814 	offsets = kcalloc(connector_count, sizeof(*offsets), GFP_KERNEL);
815 	enabled = kcalloc(connector_count, sizeof(bool), GFP_KERNEL);
816 	if (!crtcs || !modes || !enabled || !offsets) {
817 		DRM_ERROR("Memory allocation failed\n");
818 		ret = -ENOMEM;
819 		goto out;
820 	}
821 
822 	mutex_lock(&client->modeset_mutex);
823 
824 	mutex_lock(&dev->mode_config.mutex);
825 	for (i = 0; i < connector_count; i++)
826 		total_modes_count += connectors[i]->funcs->fill_modes(connectors[i], width, height);
827 	if (!total_modes_count)
828 		DRM_DEBUG_KMS("No connectors reported connected with modes\n");
829 	drm_client_connectors_enabled(connectors, connector_count, enabled);
830 
831 	if (!drm_client_firmware_config(client, connectors, connector_count, crtcs,
832 					modes, offsets, enabled, width, height)) {
833 		memset(modes, 0, connector_count * sizeof(*modes));
834 		memset(crtcs, 0, connector_count * sizeof(*crtcs));
835 		memset(offsets, 0, connector_count * sizeof(*offsets));
836 
837 		if (!drm_client_target_cloned(dev, connectors, connector_count, modes,
838 					      offsets, enabled, width, height) &&
839 		    !drm_client_target_preferred(connectors, connector_count, modes,
840 						 offsets, enabled, width, height))
841 			DRM_ERROR("Unable to find initial modes\n");
842 
843 		DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
844 			      width, height);
845 
846 		drm_client_pick_crtcs(client, connectors, connector_count,
847 				      crtcs, modes, 0, width, height);
848 	}
849 
850 	drm_client_modeset_release(client);
851 
852 	for (i = 0; i < connector_count; i++) {
853 		struct drm_display_mode *mode = modes[i];
854 		struct drm_crtc *crtc = crtcs[i];
855 		struct drm_client_offset *offset = &offsets[i];
856 
857 		if (mode && crtc) {
858 			struct drm_mode_set *modeset = drm_client_find_modeset(client, crtc);
859 			struct drm_connector *connector = connectors[i];
860 
861 			DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
862 				      mode->name, crtc->base.id, offset->x, offset->y);
863 
864 			if (WARN_ON_ONCE(modeset->num_connectors == DRM_CLIENT_MAX_CLONED_CONNECTORS ||
865 					 (dev->mode_config.num_crtc > 1 && modeset->num_connectors == 1))) {
866 				ret = -EINVAL;
867 				break;
868 			}
869 
870 			kfree(modeset->mode);
871 			modeset->mode = drm_mode_duplicate(dev, mode);
872 			drm_connector_get(connector);
873 			modeset->connectors[modeset->num_connectors++] = connector;
874 			modeset->x = offset->x;
875 			modeset->y = offset->y;
876 		}
877 	}
878 	mutex_unlock(&dev->mode_config.mutex);
879 
880 	mutex_unlock(&client->modeset_mutex);
881 out:
882 	kfree(crtcs);
883 	kfree(modes);
884 	kfree(offsets);
885 	kfree(enabled);
886 free_connectors:
887 	for (i = 0; i < connector_count; i++)
888 		drm_connector_put(connectors[i]);
889 	kfree(connectors);
890 
891 	return ret;
892 }
893 EXPORT_SYMBOL(drm_client_modeset_probe);
894 
895 /**
896  * drm_client_rotation() - Check the initial rotation value
897  * @modeset: DRM modeset
898  * @rotation: Returned rotation value
899  *
900  * This function checks if the primary plane in @modeset can hw rotate
901  * to match the rotation needed on its connector.
902  *
903  * Note: Currently only 0 and 180 degrees are supported.
904  *
905  * Return:
906  * True if the plane can do the rotation, false otherwise.
907  */
908 bool drm_client_rotation(struct drm_mode_set *modeset, unsigned int *rotation)
909 {
910 	struct drm_connector *connector = modeset->connectors[0];
911 	struct drm_plane *plane = modeset->crtc->primary;
912 	struct drm_cmdline_mode *cmdline;
913 	u64 valid_mask = 0;
914 	unsigned int i;
915 
916 	if (!modeset->num_connectors)
917 		return false;
918 
919 	switch (connector->display_info.panel_orientation) {
920 	case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP:
921 		*rotation = DRM_MODE_ROTATE_180;
922 		break;
923 	case DRM_MODE_PANEL_ORIENTATION_LEFT_UP:
924 		*rotation = DRM_MODE_ROTATE_90;
925 		break;
926 	case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP:
927 		*rotation = DRM_MODE_ROTATE_270;
928 		break;
929 	default:
930 		*rotation = DRM_MODE_ROTATE_0;
931 	}
932 
933 	/**
934 	 * The panel already defined the default rotation
935 	 * through its orientation. Whatever has been provided
936 	 * on the command line needs to be added to that.
937 	 *
938 	 * Unfortunately, the rotations are at different bit
939 	 * indices, so the math to add them up are not as
940 	 * trivial as they could.
941 	 *
942 	 * Reflections on the other hand are pretty trivial to deal with, a
943 	 * simple XOR between the two handle the addition nicely.
944 	 */
945 	cmdline = &connector->cmdline_mode;
946 	if (cmdline->specified && cmdline->rotation_reflection) {
947 		unsigned int cmdline_rest, panel_rest;
948 		unsigned int cmdline_rot, panel_rot;
949 		unsigned int sum_rot, sum_rest;
950 
951 		panel_rot = ilog2(*rotation & DRM_MODE_ROTATE_MASK);
952 		cmdline_rot = ilog2(cmdline->rotation_reflection & DRM_MODE_ROTATE_MASK);
953 		sum_rot = (panel_rot + cmdline_rot) % 4;
954 
955 		panel_rest = *rotation & ~DRM_MODE_ROTATE_MASK;
956 		cmdline_rest = cmdline->rotation_reflection & ~DRM_MODE_ROTATE_MASK;
957 		sum_rest = panel_rest ^ cmdline_rest;
958 
959 		*rotation = (1 << sum_rot) | sum_rest;
960 	}
961 
962 	/*
963 	 * TODO: support 90 / 270 degree hardware rotation,
964 	 * depending on the hardware this may require the framebuffer
965 	 * to be in a specific tiling format.
966 	 */
967 	if (((*rotation & DRM_MODE_ROTATE_MASK) != DRM_MODE_ROTATE_0 &&
968 	     (*rotation & DRM_MODE_ROTATE_MASK) != DRM_MODE_ROTATE_180) ||
969 	    !plane->rotation_property)
970 		return false;
971 
972 	for (i = 0; i < plane->rotation_property->num_values; i++)
973 		valid_mask |= (1ULL << plane->rotation_property->values[i]);
974 
975 	if (!(*rotation & valid_mask))
976 		return false;
977 
978 	return true;
979 }
980 EXPORT_SYMBOL(drm_client_rotation);
981 
982 static int drm_client_modeset_commit_atomic(struct drm_client_dev *client, bool active, bool check)
983 {
984 	struct drm_device *dev = client->dev;
985 	struct drm_plane *plane;
986 	struct drm_atomic_state *state;
987 	struct drm_modeset_acquire_ctx ctx;
988 	struct drm_mode_set *mode_set;
989 	int ret;
990 
991 	drm_modeset_acquire_init(&ctx, 0);
992 
993 	state = drm_atomic_state_alloc(dev);
994 	if (!state) {
995 		ret = -ENOMEM;
996 		goto out_ctx;
997 	}
998 
999 	state->acquire_ctx = &ctx;
1000 retry:
1001 	drm_for_each_plane(plane, dev) {
1002 		struct drm_plane_state *plane_state;
1003 
1004 		plane_state = drm_atomic_get_plane_state(state, plane);
1005 		if (IS_ERR(plane_state)) {
1006 			ret = PTR_ERR(plane_state);
1007 			goto out_state;
1008 		}
1009 
1010 		plane_state->rotation = DRM_MODE_ROTATE_0;
1011 
1012 		/* disable non-primary: */
1013 		if (plane->type == DRM_PLANE_TYPE_PRIMARY)
1014 			continue;
1015 
1016 		ret = __drm_atomic_helper_disable_plane(plane, plane_state);
1017 		if (ret != 0)
1018 			goto out_state;
1019 	}
1020 
1021 	drm_client_for_each_modeset(mode_set, client) {
1022 		struct drm_plane *primary = mode_set->crtc->primary;
1023 		unsigned int rotation;
1024 
1025 		if (drm_client_rotation(mode_set, &rotation)) {
1026 			struct drm_plane_state *plane_state;
1027 
1028 			/* Cannot fail as we've already gotten the plane state above */
1029 			plane_state = drm_atomic_get_new_plane_state(state, primary);
1030 			plane_state->rotation = rotation;
1031 		}
1032 
1033 		ret = __drm_atomic_helper_set_config(mode_set, state);
1034 		if (ret != 0)
1035 			goto out_state;
1036 
1037 		/*
1038 		 * __drm_atomic_helper_set_config() sets active when a
1039 		 * mode is set, unconditionally clear it if we force DPMS off
1040 		 */
1041 		if (!active) {
1042 			struct drm_crtc *crtc = mode_set->crtc;
1043 			struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
1044 
1045 			crtc_state->active = false;
1046 		}
1047 	}
1048 
1049 	if (check)
1050 		ret = drm_atomic_check_only(state);
1051 	else
1052 		ret = drm_atomic_commit(state);
1053 
1054 out_state:
1055 	if (ret == -EDEADLK)
1056 		goto backoff;
1057 
1058 	drm_atomic_state_put(state);
1059 out_ctx:
1060 	drm_modeset_drop_locks(&ctx);
1061 	drm_modeset_acquire_fini(&ctx);
1062 
1063 	return ret;
1064 
1065 backoff:
1066 	drm_atomic_state_clear(state);
1067 	drm_modeset_backoff(&ctx);
1068 
1069 	goto retry;
1070 }
1071 
1072 static int drm_client_modeset_commit_legacy(struct drm_client_dev *client)
1073 {
1074 	struct drm_device *dev = client->dev;
1075 	struct drm_mode_set *mode_set;
1076 	struct drm_plane *plane;
1077 	int ret = 0;
1078 
1079 	drm_modeset_lock_all(dev);
1080 	drm_for_each_plane(plane, dev) {
1081 		if (plane->type != DRM_PLANE_TYPE_PRIMARY)
1082 			drm_plane_force_disable(plane);
1083 
1084 		if (plane->rotation_property)
1085 			drm_mode_plane_set_obj_prop(plane,
1086 						    plane->rotation_property,
1087 						    DRM_MODE_ROTATE_0);
1088 	}
1089 
1090 	drm_client_for_each_modeset(mode_set, client) {
1091 		struct drm_crtc *crtc = mode_set->crtc;
1092 
1093 		if (crtc->funcs->cursor_set2) {
1094 			ret = crtc->funcs->cursor_set2(crtc, NULL, 0, 0, 0, 0, 0);
1095 			if (ret)
1096 				goto out;
1097 		} else if (crtc->funcs->cursor_set) {
1098 			ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
1099 			if (ret)
1100 				goto out;
1101 		}
1102 
1103 		ret = drm_mode_set_config_internal(mode_set);
1104 		if (ret)
1105 			goto out;
1106 	}
1107 out:
1108 	drm_modeset_unlock_all(dev);
1109 
1110 	return ret;
1111 }
1112 
1113 /**
1114  * drm_client_modeset_check() - Check modeset configuration
1115  * @client: DRM client
1116  *
1117  * Check modeset configuration.
1118  *
1119  * Returns:
1120  * Zero on success or negative error code on failure.
1121  */
1122 int drm_client_modeset_check(struct drm_client_dev *client)
1123 {
1124 	int ret;
1125 
1126 	if (!drm_drv_uses_atomic_modeset(client->dev))
1127 		return 0;
1128 
1129 	mutex_lock(&client->modeset_mutex);
1130 	ret = drm_client_modeset_commit_atomic(client, true, true);
1131 	mutex_unlock(&client->modeset_mutex);
1132 
1133 	return ret;
1134 }
1135 EXPORT_SYMBOL(drm_client_modeset_check);
1136 
1137 /**
1138  * drm_client_modeset_commit_locked() - Force commit CRTC configuration
1139  * @client: DRM client
1140  *
1141  * Commit modeset configuration to crtcs without checking if there is a DRM
1142  * master. The assumption is that the caller already holds an internal DRM
1143  * master reference acquired with drm_master_internal_acquire().
1144  *
1145  * Returns:
1146  * Zero on success or negative error code on failure.
1147  */
1148 int drm_client_modeset_commit_locked(struct drm_client_dev *client)
1149 {
1150 	struct drm_device *dev = client->dev;
1151 	int ret;
1152 
1153 	mutex_lock(&client->modeset_mutex);
1154 	if (drm_drv_uses_atomic_modeset(dev))
1155 		ret = drm_client_modeset_commit_atomic(client, true, false);
1156 	else
1157 		ret = drm_client_modeset_commit_legacy(client);
1158 	mutex_unlock(&client->modeset_mutex);
1159 
1160 	return ret;
1161 }
1162 EXPORT_SYMBOL(drm_client_modeset_commit_locked);
1163 
1164 /**
1165  * drm_client_modeset_commit() - Commit CRTC configuration
1166  * @client: DRM client
1167  *
1168  * Commit modeset configuration to crtcs.
1169  *
1170  * Returns:
1171  * Zero on success or negative error code on failure.
1172  */
1173 int drm_client_modeset_commit(struct drm_client_dev *client)
1174 {
1175 	struct drm_device *dev = client->dev;
1176 	int ret;
1177 
1178 	if (!drm_master_internal_acquire(dev))
1179 		return -EBUSY;
1180 
1181 	ret = drm_client_modeset_commit_locked(client);
1182 
1183 	drm_master_internal_release(dev);
1184 
1185 	return ret;
1186 }
1187 EXPORT_SYMBOL(drm_client_modeset_commit);
1188 
1189 static void drm_client_modeset_dpms_legacy(struct drm_client_dev *client, int dpms_mode)
1190 {
1191 	struct drm_device *dev = client->dev;
1192 	struct drm_connector *connector;
1193 	struct drm_mode_set *modeset;
1194 	struct drm_modeset_acquire_ctx ctx;
1195 	int j;
1196 	int ret;
1197 
1198 	DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
1199 	drm_client_for_each_modeset(modeset, client) {
1200 		if (!modeset->crtc->enabled)
1201 			continue;
1202 
1203 		for (j = 0; j < modeset->num_connectors; j++) {
1204 			connector = modeset->connectors[j];
1205 			connector->funcs->dpms(connector, dpms_mode);
1206 			drm_object_property_set_value(&connector->base,
1207 				dev->mode_config.dpms_property, dpms_mode);
1208 		}
1209 	}
1210 	DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
1211 }
1212 
1213 /**
1214  * drm_client_modeset_dpms() - Set DPMS mode
1215  * @client: DRM client
1216  * @mode: DPMS mode
1217  *
1218  * Note: For atomic drivers @mode is reduced to on/off.
1219  *
1220  * Returns:
1221  * Zero on success or negative error code on failure.
1222  */
1223 int drm_client_modeset_dpms(struct drm_client_dev *client, int mode)
1224 {
1225 	struct drm_device *dev = client->dev;
1226 	int ret = 0;
1227 
1228 	if (!drm_master_internal_acquire(dev))
1229 		return -EBUSY;
1230 
1231 	mutex_lock(&client->modeset_mutex);
1232 	if (drm_drv_uses_atomic_modeset(dev))
1233 		ret = drm_client_modeset_commit_atomic(client, mode == DRM_MODE_DPMS_ON, false);
1234 	else
1235 		drm_client_modeset_dpms_legacy(client, mode);
1236 	mutex_unlock(&client->modeset_mutex);
1237 
1238 	drm_master_internal_release(dev);
1239 
1240 	return ret;
1241 }
1242 EXPORT_SYMBOL(drm_client_modeset_dpms);
1243 
1244 #ifdef CONFIG_DRM_KUNIT_TEST
1245 #include "tests/drm_client_modeset_test.c"
1246 #endif
1247