summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/gpu/drm/rcar-du/rcar_du_kms.c
blob: ca12e8ca5552b58610bb7cff68c93b60968153db (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
/*
 * rcar_du_kms.c  --  R-Car Display Unit Mode Setting
 *
 * Copyright (C) 2013-2014 Renesas Electronics Corporation
 *
 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <drm/drmP.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_gem_cma_helper.h>

#include <linux/of_graph.h>
#include <linux/wait.h>

#include "rcar_du_crtc.h"
#include "rcar_du_drv.h"
#include "rcar_du_encoder.h"
#include "rcar_du_kms.h"
#include "rcar_du_lvdsenc.h"
#include "rcar_du_regs.h"

/* -----------------------------------------------------------------------------
 * Format helpers
 */

static const struct rcar_du_format_info rcar_du_format_infos[] = {
	{
		.fourcc = DRM_FORMAT_RGB565,
		.bpp = 16,
		.planes = 1,
		.pnmr = PnMR_SPIM_TP | PnMR_DDDF_16BPP,
		.edf = PnDDCR4_EDF_NONE,
	}, {
		.fourcc = DRM_FORMAT_ARGB1555,
		.bpp = 16,
		.planes = 1,
		.pnmr = PnMR_SPIM_ALP | PnMR_DDDF_ARGB,
		.edf = PnDDCR4_EDF_NONE,
	}, {
		.fourcc = DRM_FORMAT_XRGB1555,
		.bpp = 16,
		.planes = 1,
		.pnmr = PnMR_SPIM_ALP | PnMR_DDDF_ARGB,
		.edf = PnDDCR4_EDF_NONE,
	}, {
		.fourcc = DRM_FORMAT_XRGB8888,
		.bpp = 32,
		.planes = 1,
		.pnmr = PnMR_SPIM_TP | PnMR_DDDF_16BPP,
		.edf = PnDDCR4_EDF_RGB888,
	}, {
		.fourcc = DRM_FORMAT_ARGB8888,
		.bpp = 32,
		.planes = 1,
		.pnmr = PnMR_SPIM_ALP | PnMR_DDDF_16BPP,
		.edf = PnDDCR4_EDF_ARGB8888,
	}, {
		.fourcc = DRM_FORMAT_UYVY,
		.bpp = 16,
		.planes = 1,
		.pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
		.edf = PnDDCR4_EDF_NONE,
	}, {
		.fourcc = DRM_FORMAT_YUYV,
		.bpp = 16,
		.planes = 1,
		.pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
		.edf = PnDDCR4_EDF_NONE,
	}, {
		.fourcc = DRM_FORMAT_NV12,
		.bpp = 12,
		.planes = 2,
		.pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
		.edf = PnDDCR4_EDF_NONE,
	}, {
		.fourcc = DRM_FORMAT_NV21,
		.bpp = 12,
		.planes = 2,
		.pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
		.edf = PnDDCR4_EDF_NONE,
	}, {
		/* In YUV 4:2:2, only NV16 is supported (NV61 isn't) */
		.fourcc = DRM_FORMAT_NV16,
		.bpp = 16,
		.planes = 2,
		.pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
		.edf = PnDDCR4_EDF_NONE,
	},
};

const struct rcar_du_format_info *rcar_du_format_info(u32 fourcc)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(rcar_du_format_infos); ++i) {
		if (rcar_du_format_infos[i].fourcc == fourcc)
			return &rcar_du_format_infos[i];
	}

	return NULL;
}

/* -----------------------------------------------------------------------------
 * Frame buffer
 */

int rcar_du_dumb_create(struct drm_file *file, struct drm_device *dev,
			struct drm_mode_create_dumb *args)
{
	struct rcar_du_device *rcdu = dev->dev_private;
	unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
	unsigned int align;

	/* The R8A7779 DU requires a 16 pixels pitch alignment as documented,
	 * but the R8A7790 DU seems to require a 128 bytes pitch alignment.
	 */
	if (rcar_du_needs(rcdu, RCAR_DU_QUIRK_ALIGN_128B))
		align = 128;
	else
		align = 16 * args->bpp / 8;

	args->pitch = roundup(min_pitch, align);

	return drm_gem_cma_dumb_create_internal(file, dev, args);
}

static struct drm_framebuffer *
rcar_du_fb_create(struct drm_device *dev, struct drm_file *file_priv,
		  struct drm_mode_fb_cmd2 *mode_cmd)
{
	struct rcar_du_device *rcdu = dev->dev_private;
	const struct rcar_du_format_info *format;
	unsigned int max_pitch;
	unsigned int align;
	unsigned int bpp;

	format = rcar_du_format_info(mode_cmd->pixel_format);
	if (format == NULL) {
		dev_dbg(dev->dev, "unsupported pixel format %08x\n",
			mode_cmd->pixel_format);
		return ERR_PTR(-EINVAL);
	}

	/*
	 * The pitch and alignment constraints are expressed in pixels on the
	 * hardware side and in bytes in the DRM API.
	 */
	bpp = format->planes == 2 ? 1 : format->bpp / 8;
	max_pitch =  4096 * bpp;

	if (rcar_du_needs(rcdu, RCAR_DU_QUIRK_ALIGN_128B))
		align = 128;
	else
		align = 16 * bpp;

	if (mode_cmd->pitches[0] & (align - 1) ||
	    mode_cmd->pitches[0] >= max_pitch) {
		dev_dbg(dev->dev, "invalid pitch value %u\n",
			mode_cmd->pitches[0]);
		return ERR_PTR(-EINVAL);
	}

	if (format->planes == 2) {
		if (mode_cmd->pitches[1] != mode_cmd->pitches[0]) {
			dev_dbg(dev->dev,
				"luma and chroma pitches do not match\n");
			return ERR_PTR(-EINVAL);
		}
	}

	return drm_fb_cma_create(dev, file_priv, mode_cmd);
}

static void rcar_du_output_poll_changed(struct drm_device *dev)
{
	struct rcar_du_device *rcdu = dev->dev_private;

	drm_fbdev_cma_hotplug_event(rcdu->fbdev);
}

/* -----------------------------------------------------------------------------
 * Atomic Check and Update
 */

/*
 * Atomic hardware plane allocator
 *
 * The hardware plane allocator is solely based on the atomic plane states
 * without keeping any external state to avoid races between .atomic_check()
 * and .atomic_commit().
 *
 * The core idea is to avoid using a free planes bitmask that would need to be
 * shared between check and commit handlers with a collective knowledge based on
 * the allocated hardware plane(s) for each KMS plane. The allocator then loops
 * over all plane states to compute the free planes bitmask, allocates hardware
 * planes based on that bitmask, and stores the result back in the plane states.
 *
 * For this to work we need to access the current state of planes not touched by
 * the atomic update. To ensure that it won't be modified, we need to lock all
 * planes using drm_atomic_get_plane_state(). This effectively serializes atomic
 * updates from .atomic_check() up to completion (when swapping the states if
 * the check step has succeeded) or rollback (when freeing the states if the
 * check step has failed).
 *
 * Allocation is performed in the .atomic_check() handler and applied
 * automatically when the core swaps the old and new states.
 */

static bool rcar_du_plane_needs_realloc(struct rcar_du_plane *plane,
					struct rcar_du_plane_state *state)
{
	const struct rcar_du_format_info *cur_format;

	cur_format = to_rcar_plane_state(plane->plane.state)->format;

	/* Lowering the number of planes doesn't strictly require reallocation
	 * as the extra hardware plane will be freed when committing, but doing
	 * so could lead to more fragmentation.
	 */
	return !cur_format || cur_format->planes != state->format->planes;
}

static unsigned int rcar_du_plane_hwmask(struct rcar_du_plane_state *state)
{
	unsigned int mask;

	if (state->hwindex == -1)
		return 0;

	mask = 1 << state->hwindex;
	if (state->format->planes == 2)
		mask |= 1 << ((state->hwindex + 1) % 8);

	return mask;
}

static int rcar_du_plane_hwalloc(unsigned int num_planes, unsigned int free)
{
	unsigned int i;

	for (i = 0; i < RCAR_DU_NUM_HW_PLANES; ++i) {
		if (!(free & (1 << i)))
			continue;

		if (num_planes == 1 || free & (1 << ((i + 1) % 8)))
			break;
	}

	return i == RCAR_DU_NUM_HW_PLANES ? -EBUSY : i;
}

static int rcar_du_atomic_check(struct drm_device *dev,
				struct drm_atomic_state *state)
{
	struct rcar_du_device *rcdu = dev->dev_private;
	unsigned int group_freed_planes[RCAR_DU_MAX_GROUPS] = { 0, };
	unsigned int group_free_planes[RCAR_DU_MAX_GROUPS] = { 0, };
	bool needs_realloc = false;
	unsigned int groups = 0;
	unsigned int i;
	int ret;

	ret = drm_atomic_helper_check(dev, state);
	if (ret < 0)
		return ret;

	/* Check if hardware planes need to be reallocated. */
	for (i = 0; i < dev->mode_config.num_total_plane; ++i) {
		struct rcar_du_plane_state *plane_state;
		struct rcar_du_plane *plane;
		unsigned int index;

		if (!state->planes[i])
			continue;

		plane = to_rcar_plane(state->planes[i]);
		plane_state = to_rcar_plane_state(state->plane_states[i]);

		dev_dbg(rcdu->dev, "%s: checking plane (%u,%u)\n", __func__,
			plane->group->index, plane - plane->group->planes);

		/* If the plane is being disabled we don't need to go through
		 * the full reallocation procedure. Just mark the hardware
		 * plane(s) as freed.
		 */
		if (!plane_state->format) {
			dev_dbg(rcdu->dev, "%s: plane is being disabled\n",
				__func__);
			index = plane - plane->group->planes;
			group_freed_planes[plane->group->index] |= 1 << index;
			plane_state->hwindex = -1;
			continue;
		}

		/* If the plane needs to be reallocated mark it as such, and
		 * mark the hardware plane(s) as free.
		 */
		if (rcar_du_plane_needs_realloc(plane, plane_state)) {
			dev_dbg(rcdu->dev, "%s: plane needs reallocation\n",
				__func__);
			groups |= 1 << plane->group->index;
			needs_realloc = true;

			index = plane - plane->group->planes;
			group_freed_planes[plane->group->index] |= 1 << index;
			plane_state->hwindex = -1;
		}
	}

	if (!needs_realloc)
		return 0;

	/* Grab all plane states for the groups that need reallocation to ensure
	 * locking and avoid racy updates. This serializes the update operation,
	 * but there's not much we can do about it as that's the hardware
	 * design.
	 *
	 * Compute the used planes mask for each group at the same time to avoid
	 * looping over the planes separately later.
	 */
	while (groups) {
		unsigned int index = ffs(groups) - 1;
		struct rcar_du_group *group = &rcdu->groups[index];
		unsigned int used_planes = 0;

		dev_dbg(rcdu->dev, "%s: finding free planes for group %u\n",
			__func__, index);

		for (i = 0; i < group->num_planes; ++i) {
			struct rcar_du_plane *plane = &group->planes[i];
			struct rcar_du_plane_state *plane_state;
			struct drm_plane_state *s;

			s = drm_atomic_get_plane_state(state, &plane->plane);
			if (IS_ERR(s))
				return PTR_ERR(s);

			/* If the plane has been freed in the above loop its
			 * hardware planes must not be added to the used planes
			 * bitmask. However, the current state doesn't reflect
			 * the free state yet, as we've modified the new state
			 * above. Use the local freed planes list to check for
			 * that condition instead.
			 */
			if (group_freed_planes[index] & (1 << i)) {
				dev_dbg(rcdu->dev,
					"%s: plane (%u,%u) has been freed, skipping\n",
					__func__, plane->group->index,
					plane - plane->group->planes);
				continue;
			}

			plane_state = to_rcar_plane_state(plane->plane.state);
			used_planes |= rcar_du_plane_hwmask(plane_state);

			dev_dbg(rcdu->dev,
				"%s: plane (%u,%u) uses %u hwplanes (index %d)\n",
				__func__, plane->group->index,
				plane - plane->group->planes,
				plane_state->format ?
				plane_state->format->planes : 0,
				plane_state->hwindex);
		}

		group_free_planes[index] = 0xff & ~used_planes;
		groups &= ~(1 << index);

		dev_dbg(rcdu->dev, "%s: group %u free planes mask 0x%02x\n",
			__func__, index, group_free_planes[index]);
	}

	/* Reallocate hardware planes for each plane that needs it. */
	for (i = 0; i < dev->mode_config.num_total_plane; ++i) {
		struct rcar_du_plane_state *plane_state;
		struct rcar_du_plane *plane;
		unsigned int crtc_planes;
		unsigned int free;
		int idx;

		if (!state->planes[i])
			continue;

		plane = to_rcar_plane(state->planes[i]);
		plane_state = to_rcar_plane_state(state->plane_states[i]);

		dev_dbg(rcdu->dev, "%s: allocating plane (%u,%u)\n", __func__,
			plane->group->index, plane - plane->group->planes);

		/* Skip planes that are being disabled or don't need to be
		 * reallocated.
		 */
		if (!plane_state->format ||
		    !rcar_du_plane_needs_realloc(plane, plane_state))
			continue;

		/* Try to allocate the plane from the free planes currently
		 * associated with the target CRTC to avoid restarting the CRTC
		 * group and thus minimize flicker. If it fails fall back to
		 * allocating from all free planes.
		 */
		crtc_planes = to_rcar_crtc(plane_state->state.crtc)->index % 2
			    ? plane->group->dptsr_planes
			    : ~plane->group->dptsr_planes;
		free = group_free_planes[plane->group->index];

		idx = rcar_du_plane_hwalloc(plane_state->format->planes,
					    free & crtc_planes);
		if (idx < 0)
			idx = rcar_du_plane_hwalloc(plane_state->format->planes,
						    free);
		if (idx < 0) {
			dev_dbg(rcdu->dev, "%s: no available hardware plane\n",
				__func__);
			return idx;
		}

		dev_dbg(rcdu->dev, "%s: allocated %u hwplanes (index %u)\n",
			__func__, plane_state->format->planes, idx);

		plane_state->hwindex = idx;

		group_free_planes[plane->group->index] &=
			~rcar_du_plane_hwmask(plane_state);

		dev_dbg(rcdu->dev, "%s: group %u free planes mask 0x%02x\n",
			__func__, plane->group->index,
			group_free_planes[plane->group->index]);
	}

	return 0;
}

struct rcar_du_commit {
	struct work_struct work;
	struct drm_device *dev;
	struct drm_atomic_state *state;
	u32 crtcs;
};

static void rcar_du_atomic_complete(struct rcar_du_commit *commit)
{
	struct drm_device *dev = commit->dev;
	struct rcar_du_device *rcdu = dev->dev_private;
	struct drm_atomic_state *old_state = commit->state;

	/* Apply the atomic update. */
	drm_atomic_helper_commit_modeset_disables(dev, old_state);
	drm_atomic_helper_commit_modeset_enables(dev, old_state);
	drm_atomic_helper_commit_planes(dev, old_state, false);

	drm_atomic_helper_wait_for_vblanks(dev, old_state);

	drm_atomic_helper_cleanup_planes(dev, old_state);

	drm_atomic_state_free(old_state);

	/* Complete the commit, wake up any waiter. */
	spin_lock(&rcdu->commit.wait.lock);
	rcdu->commit.pending &= ~commit->crtcs;
	wake_up_all_locked(&rcdu->commit.wait);
	spin_unlock(&rcdu->commit.wait.lock);

	kfree(commit);
}

static void rcar_du_atomic_work(struct work_struct *work)
{
	struct rcar_du_commit *commit =
		container_of(work, struct rcar_du_commit, work);

	rcar_du_atomic_complete(commit);
}

static int rcar_du_atomic_commit(struct drm_device *dev,
				 struct drm_atomic_state *state, bool async)
{
	struct rcar_du_device *rcdu = dev->dev_private;
	struct rcar_du_commit *commit;
	unsigned int i;
	int ret;

	ret = drm_atomic_helper_prepare_planes(dev, state);
	if (ret)
		return ret;

	/* Allocate the commit object. */
	commit = kzalloc(sizeof(*commit), GFP_KERNEL);
	if (commit == NULL) {
		ret = -ENOMEM;
		goto error;
	}

	INIT_WORK(&commit->work, rcar_du_atomic_work);
	commit->dev = dev;
	commit->state = state;

	/* Wait until all affected CRTCs have completed previous commits and
	 * mark them as pending.
	 */
	for (i = 0; i < dev->mode_config.num_crtc; ++i) {
		if (state->crtcs[i])
			commit->crtcs |= 1 << drm_crtc_index(state->crtcs[i]);
	}

	spin_lock(&rcdu->commit.wait.lock);
	ret = wait_event_interruptible_locked(rcdu->commit.wait,
			!(rcdu->commit.pending & commit->crtcs));
	if (ret == 0)
		rcdu->commit.pending |= commit->crtcs;
	spin_unlock(&rcdu->commit.wait.lock);

	if (ret) {
		kfree(commit);
		goto error;
	}

	/* Swap the state, this is the point of no return. */
	drm_atomic_helper_swap_state(dev, state);

	if (async)
		schedule_work(&commit->work);
	else
		rcar_du_atomic_complete(commit);

	return 0;

error:
	drm_atomic_helper_cleanup_planes(dev, state);
	return ret;
}

/* -----------------------------------------------------------------------------
 * Initialization
 */

static const struct drm_mode_config_funcs rcar_du_mode_config_funcs = {
	.fb_create = rcar_du_fb_create,
	.output_poll_changed = rcar_du_output_poll_changed,
	.atomic_check = rcar_du_atomic_check,
	.atomic_commit = rcar_du_atomic_commit,
};

static int rcar_du_encoders_init_one(struct rcar_du_device *rcdu,
				     enum rcar_du_output output,
				     struct of_endpoint *ep)
{
	static const struct {
		const char *compatible;
		enum rcar_du_encoder_type type;
	} encoders[] = {
		{ "adi,adv7123", RCAR_DU_ENCODER_VGA },
		{ "adi,adv7511w", RCAR_DU_ENCODER_HDMI },
		{ "thine,thc63lvdm83d", RCAR_DU_ENCODER_LVDS },
	};

	enum rcar_du_encoder_type enc_type = RCAR_DU_ENCODER_NONE;
	struct device_node *connector = NULL;
	struct device_node *encoder = NULL;
	struct device_node *ep_node = NULL;
	struct device_node *entity_ep_node;
	struct device_node *entity;
	int ret;

	/*
	 * Locate the connected entity and infer its type from the number of
	 * endpoints.
	 */
	entity = of_graph_get_remote_port_parent(ep->local_node);
	if (!entity) {
		dev_dbg(rcdu->dev, "unconnected endpoint %s, skipping\n",
			ep->local_node->full_name);
		return -ENODEV;
	}

	entity_ep_node = of_parse_phandle(ep->local_node, "remote-endpoint", 0);

	for_each_endpoint_of_node(entity, ep_node) {
		if (ep_node == entity_ep_node)
			continue;

		/*
		 * We've found one endpoint other than the input, this must
		 * be an encoder. Locate the connector.
		 */
		encoder = entity;
		connector = of_graph_get_remote_port_parent(ep_node);
		of_node_put(ep_node);

		if (!connector) {
			dev_warn(rcdu->dev,
				 "no connector for encoder %s, skipping\n",
				 encoder->full_name);
			of_node_put(entity_ep_node);
			of_node_put(encoder);
			return -ENODEV;
		}

		break;
	}

	of_node_put(entity_ep_node);

	if (encoder) {
		/*
		 * If an encoder has been found, get its type based on its
		 * compatible string.
		 */
		unsigned int i;

		for (i = 0; i < ARRAY_SIZE(encoders); ++i) {
			if (of_device_is_compatible(encoder,
						    encoders[i].compatible)) {
				enc_type = encoders[i].type;
				break;
			}
		}

		if (i == ARRAY_SIZE(encoders)) {
			dev_warn(rcdu->dev,
				 "unknown encoder type for %s, skipping\n",
				 encoder->full_name);
			of_node_put(encoder);
			of_node_put(connector);
			return -EINVAL;
		}
	} else {
		/*
		 * If no encoder has been found the entity must be the
		 * connector.
		 */
		connector = entity;
	}

	ret = rcar_du_encoder_init(rcdu, enc_type, output, encoder, connector);
	of_node_put(encoder);
	of_node_put(connector);

	if (ret && ret != -EPROBE_DEFER)
		dev_warn(rcdu->dev,
			 "failed to initialize encoder %s (%d), skipping\n",
			 encoder->full_name, ret);

	return ret;
}

static int rcar_du_encoders_init(struct rcar_du_device *rcdu)
{
	struct device_node *np = rcdu->dev->of_node;
	struct device_node *ep_node;
	unsigned int num_encoders = 0;

	/*
	 * Iterate over the endpoints and create one encoder for each output
	 * pipeline.
	 */
	for_each_endpoint_of_node(np, ep_node) {
		enum rcar_du_output output;
		struct of_endpoint ep;
		unsigned int i;
		int ret;

		ret = of_graph_parse_endpoint(ep_node, &ep);
		if (ret < 0) {
			of_node_put(ep_node);
			return ret;
		}

		/* Find the output route corresponding to the port number. */
		for (i = 0; i < RCAR_DU_OUTPUT_MAX; ++i) {
			if (rcdu->info->routes[i].possible_crtcs &&
			    rcdu->info->routes[i].port == ep.port) {
				output = i;
				break;
			}
		}

		if (i == RCAR_DU_OUTPUT_MAX) {
			dev_warn(rcdu->dev,
				 "port %u references unexisting output, skipping\n",
				 ep.port);
			continue;
		}

		/* Process the output pipeline. */
		ret = rcar_du_encoders_init_one(rcdu, output, &ep);
		if (ret < 0) {
			if (ret == -EPROBE_DEFER) {
				of_node_put(ep_node);
				return ret;
			}

			continue;
		}

		num_encoders++;
	}

	return num_encoders;
}

static int rcar_du_properties_init(struct rcar_du_device *rcdu)
{
	rcdu->props.alpha =
		drm_property_create_range(rcdu->ddev, 0, "alpha", 0, 255);
	if (rcdu->props.alpha == NULL)
		return -ENOMEM;

	/* The color key is expressed as an RGB888 triplet stored in a 32-bit
	 * integer in XRGB8888 format. Bit 24 is used as a flag to disable (0)
	 * or enable source color keying (1).
	 */
	rcdu->props.colorkey =
		drm_property_create_range(rcdu->ddev, 0, "colorkey",
					  0, 0x01ffffff);
	if (rcdu->props.colorkey == NULL)
		return -ENOMEM;

	rcdu->props.zpos =
		drm_property_create_range(rcdu->ddev, 0, "zpos", 1, 7);
	if (rcdu->props.zpos == NULL)
		return -ENOMEM;

	return 0;
}

int rcar_du_modeset_init(struct rcar_du_device *rcdu)
{
	static const unsigned int mmio_offsets[] = {
		DU0_REG_OFFSET, DU2_REG_OFFSET
	};

	struct drm_device *dev = rcdu->ddev;
	struct drm_encoder *encoder;
	struct drm_fbdev_cma *fbdev;
	unsigned int num_encoders;
	unsigned int num_groups;
	unsigned int i;
	int ret;

	drm_mode_config_init(dev);

	dev->mode_config.min_width = 0;
	dev->mode_config.min_height = 0;
	dev->mode_config.max_width = 4095;
	dev->mode_config.max_height = 2047;
	dev->mode_config.funcs = &rcar_du_mode_config_funcs;

	rcdu->num_crtcs = rcdu->info->num_crtcs;

	ret = rcar_du_properties_init(rcdu);
	if (ret < 0)
		return ret;

	/* Initialize the groups. */
	num_groups = DIV_ROUND_UP(rcdu->num_crtcs, 2);

	for (i = 0; i < num_groups; ++i) {
		struct rcar_du_group *rgrp = &rcdu->groups[i];

		mutex_init(&rgrp->lock);

		rgrp->dev = rcdu;
		rgrp->mmio_offset = mmio_offsets[i];
		rgrp->index = i;
		rgrp->num_crtcs = min(rcdu->num_crtcs - 2 * i, 2U);

		/* If we have more than one CRTCs in this group pre-associate
		 * planes 0-3 with CRTC 0 and planes 4-7 with CRTC 1 to minimize
		 * flicker occurring when the association is changed.
		 */
		rgrp->dptsr_planes = rgrp->num_crtcs > 1 ? 0xf0 : 0;

		ret = rcar_du_planes_init(rgrp);
		if (ret < 0)
			return ret;
	}

	/* Create the CRTCs. */
	for (i = 0; i < rcdu->num_crtcs; ++i) {
		struct rcar_du_group *rgrp = &rcdu->groups[i / 2];

		ret = rcar_du_crtc_create(rgrp, i);
		if (ret < 0)
			return ret;
	}

	/* Initialize the encoders. */
	ret = rcar_du_lvdsenc_init(rcdu);
	if (ret < 0)
		return ret;

	ret = rcar_du_encoders_init(rcdu);
	if (ret < 0)
		return ret;

	if (ret == 0) {
		dev_err(rcdu->dev, "error: no encoder could be initialized\n");
		return -EINVAL;
	}

	num_encoders = ret;

	/* Set the possible CRTCs and possible clones. There's always at least
	 * one way for all encoders to clone each other, set all bits in the
	 * possible clones field.
	 */
	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
		struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
		const struct rcar_du_output_routing *route =
			&rcdu->info->routes[renc->output];

		encoder->possible_crtcs = route->possible_crtcs;
		encoder->possible_clones = (1 << num_encoders) - 1;
	}

	drm_mode_config_reset(dev);

	drm_kms_helper_poll_init(dev);

	if (dev->mode_config.num_connector) {
		fbdev = drm_fbdev_cma_init(dev, 32, dev->mode_config.num_crtc,
					   dev->mode_config.num_connector);
		if (IS_ERR(fbdev))
			return PTR_ERR(fbdev);

		rcdu->fbdev = fbdev;
	} else {
		dev_info(rcdu->dev,
			 "no connector found, disabling fbdev emulation\n");
	}

	return 0;
}