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