summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
blob: 051e5e1b7ad61c2340fb618a4e873adc545d41c4 (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
/*
 * Copyright (C) 2012 Texas Instruments
 * Author: Rob Clark <robdclark@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "drm_flip_work.h"
#include <drm/drm_plane_helper.h>

#include "tilcdc_drv.h"
#include "tilcdc_regs.h"

#define TILCDC_VBLANK_SAFETY_THRESHOLD_US 1000

struct tilcdc_crtc {
	struct drm_crtc base;

	const struct tilcdc_panel_info *info;
	struct drm_pending_vblank_event *event;
	int dpms;
	wait_queue_head_t frame_done_wq;
	bool frame_done;
	spinlock_t irq_lock;

	ktime_t last_vblank;

	struct drm_framebuffer *curr_fb;
	struct drm_framebuffer *next_fb;

	/* for deferred fb unref's: */
	struct drm_flip_work unref_work;

	/* Only set if an external encoder is connected */
	bool simulate_vesa_sync;

	int sync_lost_count;
	bool frame_intact;
};
#define to_tilcdc_crtc(x) container_of(x, struct tilcdc_crtc, base)

static void unref_worker(struct drm_flip_work *work, void *val)
{
	struct tilcdc_crtc *tilcdc_crtc =
		container_of(work, struct tilcdc_crtc, unref_work);
	struct drm_device *dev = tilcdc_crtc->base.dev;

	mutex_lock(&dev->mode_config.mutex);
	drm_framebuffer_unreference(val);
	mutex_unlock(&dev->mode_config.mutex);
}

static void set_scanout(struct drm_crtc *crtc, struct drm_framebuffer *fb)
{
	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
	struct drm_device *dev = crtc->dev;
	struct drm_gem_cma_object *gem;
	unsigned int depth, bpp;
	dma_addr_t start, end;

	drm_fb_get_bpp_depth(fb->pixel_format, &depth, &bpp);
	gem = drm_fb_cma_get_gem_obj(fb, 0);

	start = gem->paddr + fb->offsets[0] +
		crtc->y * fb->pitches[0] +
		crtc->x * bpp / 8;

	end = start + (crtc->mode.vdisplay * fb->pitches[0]);

	tilcdc_write(dev, LCDC_DMA_FB_BASE_ADDR_0_REG, start);
	tilcdc_write(dev, LCDC_DMA_FB_CEILING_ADDR_0_REG, end);

	if (tilcdc_crtc->curr_fb)
		drm_flip_work_queue(&tilcdc_crtc->unref_work,
			tilcdc_crtc->curr_fb);

	tilcdc_crtc->curr_fb = fb;
}

static void reset(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct tilcdc_drm_private *priv = dev->dev_private;

	if (priv->rev != 2)
		return;

	tilcdc_set(dev, LCDC_CLK_RESET_REG, LCDC_CLK_MAIN_RESET);
	usleep_range(250, 1000);
	tilcdc_clear(dev, LCDC_CLK_RESET_REG, LCDC_CLK_MAIN_RESET);
}

static void start(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;

	reset(crtc);

	tilcdc_clear(dev, LCDC_DMA_CTRL_REG, LCDC_DUAL_FRAME_BUFFER_ENABLE);
	tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_PALETTE_LOAD_MODE(DATA_ONLY));
	tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
}

static void stop(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;

	tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
}

static void tilcdc_crtc_destroy(struct drm_crtc *crtc)
{
	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);

	tilcdc_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);

	of_node_put(crtc->port);
	drm_crtc_cleanup(crtc);
	drm_flip_work_cleanup(&tilcdc_crtc->unref_work);
}

static int tilcdc_verify_fb(struct drm_crtc *crtc, struct drm_framebuffer *fb)
{
	struct drm_device *dev = crtc->dev;
	unsigned int depth, bpp;

	drm_fb_get_bpp_depth(fb->pixel_format, &depth, &bpp);

	if (fb->pitches[0] != crtc->mode.hdisplay * bpp / 8) {
		dev_err(dev->dev,
			"Invalid pitch: fb and crtc widths must be the same");
		return -EINVAL;
	}

	return 0;
}

static int tilcdc_crtc_page_flip(struct drm_crtc *crtc,
		struct drm_framebuffer *fb,
		struct drm_pending_vblank_event *event,
		uint32_t page_flip_flags)
{
	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
	struct drm_device *dev = crtc->dev;
	int r;
	unsigned long flags;
	s64 tdiff;
	ktime_t next_vblank;

	r = tilcdc_verify_fb(crtc, fb);
	if (r)
		return r;

	if (tilcdc_crtc->event) {
		dev_err(dev->dev, "already pending page flip!\n");
		return -EBUSY;
	}

	drm_framebuffer_reference(fb);

	crtc->primary->fb = fb;

	pm_runtime_get_sync(dev->dev);

	spin_lock_irqsave(&tilcdc_crtc->irq_lock, flags);

	next_vblank = ktime_add_us(tilcdc_crtc->last_vblank,
		1000000 / crtc->hwmode.vrefresh);

	tdiff = ktime_to_us(ktime_sub(next_vblank, ktime_get()));

	if (tdiff >= TILCDC_VBLANK_SAFETY_THRESHOLD_US)
		set_scanout(crtc, fb);
	else
		tilcdc_crtc->next_fb = fb;

	tilcdc_crtc->event = event;

	spin_unlock_irqrestore(&tilcdc_crtc->irq_lock, flags);

	pm_runtime_put_sync(dev->dev);

	return 0;
}

void tilcdc_crtc_dpms(struct drm_crtc *crtc, int mode)
{
	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
	struct drm_device *dev = crtc->dev;
	struct tilcdc_drm_private *priv = dev->dev_private;

	/* we really only care about on or off: */
	if (mode != DRM_MODE_DPMS_ON)
		mode = DRM_MODE_DPMS_OFF;

	if (tilcdc_crtc->dpms == mode)
		return;

	tilcdc_crtc->dpms = mode;

	if (mode == DRM_MODE_DPMS_ON) {
		pm_runtime_get_sync(dev->dev);
		start(crtc);
	} else {
		tilcdc_crtc->frame_done = false;
		stop(crtc);

		/*
		 * if necessary wait for framedone irq which will still come
		 * before putting things to sleep..
		 */
		if (priv->rev == 2) {
			int ret = wait_event_timeout(
					tilcdc_crtc->frame_done_wq,
					tilcdc_crtc->frame_done,
					msecs_to_jiffies(50));
			if (ret == 0)
				dev_err(dev->dev, "timeout waiting for framedone\n");
		}

		pm_runtime_put_sync(dev->dev);

		if (tilcdc_crtc->next_fb) {
			drm_flip_work_queue(&tilcdc_crtc->unref_work,
					    tilcdc_crtc->next_fb);
			tilcdc_crtc->next_fb = NULL;
		}

		if (tilcdc_crtc->curr_fb) {
			drm_flip_work_queue(&tilcdc_crtc->unref_work,
					    tilcdc_crtc->curr_fb);
			tilcdc_crtc->curr_fb = NULL;
		}

		drm_flip_work_commit(&tilcdc_crtc->unref_work, priv->wq);
	}
}

static bool tilcdc_crtc_mode_fixup(struct drm_crtc *crtc,
		const struct drm_display_mode *mode,
		struct drm_display_mode *adjusted_mode)
{
	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);

	if (!tilcdc_crtc->simulate_vesa_sync)
		return true;

	/*
	 * tilcdc does not generate VESA-compliant sync but aligns
	 * VS on the second edge of HS instead of first edge.
	 * We use adjusted_mode, to fixup sync by aligning both rising
	 * edges and add HSKEW offset to fix the sync.
	 */
	adjusted_mode->hskew = mode->hsync_end - mode->hsync_start;
	adjusted_mode->flags |= DRM_MODE_FLAG_HSKEW;

	if (mode->flags & DRM_MODE_FLAG_NHSYNC) {
		adjusted_mode->flags |= DRM_MODE_FLAG_PHSYNC;
		adjusted_mode->flags &= ~DRM_MODE_FLAG_NHSYNC;
	} else {
		adjusted_mode->flags |= DRM_MODE_FLAG_NHSYNC;
		adjusted_mode->flags &= ~DRM_MODE_FLAG_PHSYNC;
	}

	return true;
}

static void tilcdc_crtc_prepare(struct drm_crtc *crtc)
{
	tilcdc_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
}

static void tilcdc_crtc_commit(struct drm_crtc *crtc)
{
	tilcdc_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
}

static int tilcdc_crtc_mode_set(struct drm_crtc *crtc,
		struct drm_display_mode *mode,
		struct drm_display_mode *adjusted_mode,
		int x, int y,
		struct drm_framebuffer *old_fb)
{
	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
	struct drm_device *dev = crtc->dev;
	struct tilcdc_drm_private *priv = dev->dev_private;
	const struct tilcdc_panel_info *info = tilcdc_crtc->info;
	uint32_t reg, hbp, hfp, hsw, vbp, vfp, vsw;
	int ret;

	ret = tilcdc_crtc_mode_valid(crtc, mode);
	if (WARN_ON(ret))
		return ret;

	if (WARN_ON(!info))
		return -EINVAL;

	ret = tilcdc_verify_fb(crtc, crtc->primary->fb);
	if (ret)
		return ret;

	pm_runtime_get_sync(dev->dev);

	/* Configure the Burst Size and fifo threshold of DMA: */
	reg = tilcdc_read(dev, LCDC_DMA_CTRL_REG) & ~0x00000770;
	switch (info->dma_burst_sz) {
	case 1:
		reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_1);
		break;
	case 2:
		reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_2);
		break;
	case 4:
		reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_4);
		break;
	case 8:
		reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_8);
		break;
	case 16:
		reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_16);
		break;
	default:
		return -EINVAL;
	}
	reg |= (info->fifo_th << 8);
	tilcdc_write(dev, LCDC_DMA_CTRL_REG, reg);

	/* Configure timings: */
	hbp = mode->htotal - mode->hsync_end;
	hfp = mode->hsync_start - mode->hdisplay;
	hsw = mode->hsync_end - mode->hsync_start;
	vbp = mode->vtotal - mode->vsync_end;
	vfp = mode->vsync_start - mode->vdisplay;
	vsw = mode->vsync_end - mode->vsync_start;

	DBG("%dx%d, hbp=%u, hfp=%u, hsw=%u, vbp=%u, vfp=%u, vsw=%u",
			mode->hdisplay, mode->vdisplay, hbp, hfp, hsw, vbp, vfp, vsw);

	/* Configure the AC Bias Period and Number of Transitions per Interrupt: */
	reg = tilcdc_read(dev, LCDC_RASTER_TIMING_2_REG) & ~0x000fff00;
	reg |= LCDC_AC_BIAS_FREQUENCY(info->ac_bias) |
		LCDC_AC_BIAS_TRANSITIONS_PER_INT(info->ac_bias_intrpt);

	/*
	 * subtract one from hfp, hbp, hsw because the hardware uses
	 * a value of 0 as 1
	 */
	if (priv->rev == 2) {
		/* clear bits we're going to set */
		reg &= ~0x78000033;
		reg |= ((hfp-1) & 0x300) >> 8;
		reg |= ((hbp-1) & 0x300) >> 4;
		reg |= ((hsw-1) & 0x3c0) << 21;
	}
	tilcdc_write(dev, LCDC_RASTER_TIMING_2_REG, reg);

	reg = (((mode->hdisplay >> 4) - 1) << 4) |
		(((hbp-1) & 0xff) << 24) |
		(((hfp-1) & 0xff) << 16) |
		(((hsw-1) & 0x3f) << 10);
	if (priv->rev == 2)
		reg |= (((mode->hdisplay >> 4) - 1) & 0x40) >> 3;
	tilcdc_write(dev, LCDC_RASTER_TIMING_0_REG, reg);

	reg = ((mode->vdisplay - 1) & 0x3ff) |
		((vbp & 0xff) << 24) |
		((vfp & 0xff) << 16) |
		(((vsw-1) & 0x3f) << 10);
	tilcdc_write(dev, LCDC_RASTER_TIMING_1_REG, reg);

	/*
	 * be sure to set Bit 10 for the V2 LCDC controller,
	 * otherwise limited to 1024 pixels width, stopping
	 * 1920x1080 being suppoted.
	 */
	if (priv->rev == 2) {
		if ((mode->vdisplay - 1) & 0x400) {
			tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG,
				LCDC_LPP_B10);
		} else {
			tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG,
				LCDC_LPP_B10);
		}
	}

	/* Configure display type: */
	reg = tilcdc_read(dev, LCDC_RASTER_CTRL_REG) &
		~(LCDC_TFT_MODE | LCDC_MONO_8BIT_MODE | LCDC_MONOCHROME_MODE |
			LCDC_V2_TFT_24BPP_MODE | LCDC_V2_TFT_24BPP_UNPACK | 0x000ff000);
	reg |= LCDC_TFT_MODE; /* no monochrome/passive support */
	if (info->tft_alt_mode)
		reg |= LCDC_TFT_ALT_ENABLE;
	if (priv->rev == 2) {
		unsigned int depth, bpp;

		drm_fb_get_bpp_depth(crtc->primary->fb->pixel_format, &depth, &bpp);
		switch (bpp) {
		case 16:
			break;
		case 32:
			reg |= LCDC_V2_TFT_24BPP_UNPACK;
			/* fallthrough */
		case 24:
			reg |= LCDC_V2_TFT_24BPP_MODE;
			break;
		default:
			dev_err(dev->dev, "invalid pixel format\n");
			return -EINVAL;
		}
	}
	reg |= info->fdd < 12;
	tilcdc_write(dev, LCDC_RASTER_CTRL_REG, reg);

	if (info->invert_pxl_clk)
		tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_PIXEL_CLOCK);
	else
		tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_PIXEL_CLOCK);

	if (info->sync_ctrl)
		tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_CTRL);
	else
		tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_CTRL);

	if (info->sync_edge)
		tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_EDGE);
	else
		tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_EDGE);

	/*
	 * use value from adjusted_mode here as this might have been
	 * changed as part of the fixup for slave encoders to solve the
	 * issue where tilcdc timings are not VESA compliant
	 */
	if (adjusted_mode->flags & DRM_MODE_FLAG_NHSYNC)
		tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_HSYNC);
	else
		tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_HSYNC);

	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
		tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_VSYNC);
	else
		tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_VSYNC);

	if (info->raster_order)
		tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ORDER);
	else
		tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ORDER);

	drm_framebuffer_reference(crtc->primary->fb);

	set_scanout(crtc, crtc->primary->fb);

	tilcdc_crtc_update_clk(crtc);

	pm_runtime_put_sync(dev->dev);

	return 0;
}

static int tilcdc_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
		struct drm_framebuffer *old_fb)
{
	struct drm_device *dev = crtc->dev;
	int r;

	r = tilcdc_verify_fb(crtc, crtc->primary->fb);
	if (r)
		return r;

	drm_framebuffer_reference(crtc->primary->fb);

	pm_runtime_get_sync(dev->dev);

	set_scanout(crtc, crtc->primary->fb);

	pm_runtime_put_sync(dev->dev);

	return 0;
}

static const struct drm_crtc_funcs tilcdc_crtc_funcs = {
		.destroy        = tilcdc_crtc_destroy,
		.set_config     = drm_crtc_helper_set_config,
		.page_flip      = tilcdc_crtc_page_flip,
};

static const struct drm_crtc_helper_funcs tilcdc_crtc_helper_funcs = {
		.dpms           = tilcdc_crtc_dpms,
		.mode_fixup     = tilcdc_crtc_mode_fixup,
		.prepare        = tilcdc_crtc_prepare,
		.commit         = tilcdc_crtc_commit,
		.mode_set       = tilcdc_crtc_mode_set,
		.mode_set_base  = tilcdc_crtc_mode_set_base,
};

int tilcdc_crtc_max_width(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct tilcdc_drm_private *priv = dev->dev_private;
	int max_width = 0;

	if (priv->rev == 1)
		max_width = 1024;
	else if (priv->rev == 2)
		max_width = 2048;

	return max_width;
}

int tilcdc_crtc_mode_valid(struct drm_crtc *crtc, struct drm_display_mode *mode)
{
	struct tilcdc_drm_private *priv = crtc->dev->dev_private;
	unsigned int bandwidth;
	uint32_t hbp, hfp, hsw, vbp, vfp, vsw;

	/*
	 * check to see if the width is within the range that
	 * the LCD Controller physically supports
	 */
	if (mode->hdisplay > tilcdc_crtc_max_width(crtc))
		return MODE_VIRTUAL_X;

	/* width must be multiple of 16 */
	if (mode->hdisplay & 0xf)
		return MODE_VIRTUAL_X;

	if (mode->vdisplay > 2048)
		return MODE_VIRTUAL_Y;

	DBG("Processing mode %dx%d@%d with pixel clock %d",
		mode->hdisplay, mode->vdisplay,
		drm_mode_vrefresh(mode), mode->clock);

	hbp = mode->htotal - mode->hsync_end;
	hfp = mode->hsync_start - mode->hdisplay;
	hsw = mode->hsync_end - mode->hsync_start;
	vbp = mode->vtotal - mode->vsync_end;
	vfp = mode->vsync_start - mode->vdisplay;
	vsw = mode->vsync_end - mode->vsync_start;

	if ((hbp-1) & ~0x3ff) {
		DBG("Pruning mode: Horizontal Back Porch out of range");
		return MODE_HBLANK_WIDE;
	}

	if ((hfp-1) & ~0x3ff) {
		DBG("Pruning mode: Horizontal Front Porch out of range");
		return MODE_HBLANK_WIDE;
	}

	if ((hsw-1) & ~0x3ff) {
		DBG("Pruning mode: Horizontal Sync Width out of range");
		return MODE_HSYNC_WIDE;
	}

	if (vbp & ~0xff) {
		DBG("Pruning mode: Vertical Back Porch out of range");
		return MODE_VBLANK_WIDE;
	}

	if (vfp & ~0xff) {
		DBG("Pruning mode: Vertical Front Porch out of range");
		return MODE_VBLANK_WIDE;
	}

	if ((vsw-1) & ~0x3f) {
		DBG("Pruning mode: Vertical Sync Width out of range");
		return MODE_VSYNC_WIDE;
	}

	/*
	 * some devices have a maximum allowed pixel clock
	 * configured from the DT
	 */
	if (mode->clock > priv->max_pixelclock) {
		DBG("Pruning mode: pixel clock too high");
		return MODE_CLOCK_HIGH;
	}

	/*
	 * some devices further limit the max horizontal resolution
	 * configured from the DT
	 */
	if (mode->hdisplay > priv->max_width)
		return MODE_BAD_WIDTH;

	/* filter out modes that would require too much memory bandwidth: */
	bandwidth = mode->hdisplay * mode->vdisplay *
		drm_mode_vrefresh(mode);
	if (bandwidth > priv->max_bandwidth) {
		DBG("Pruning mode: exceeds defined bandwidth limit");
		return MODE_BAD;
	}

	return MODE_OK;
}

void tilcdc_crtc_set_panel_info(struct drm_crtc *crtc,
		const struct tilcdc_panel_info *info)
{
	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
	tilcdc_crtc->info = info;
}

void tilcdc_crtc_set_simulate_vesa_sync(struct drm_crtc *crtc,
					bool simulate_vesa_sync)
{
	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);

	tilcdc_crtc->simulate_vesa_sync = simulate_vesa_sync;
}

void tilcdc_crtc_update_clk(struct drm_crtc *crtc)
{
	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
	struct drm_device *dev = crtc->dev;
	struct tilcdc_drm_private *priv = dev->dev_private;
	int dpms = tilcdc_crtc->dpms;
	unsigned long lcd_clk;
	const unsigned clkdiv = 2; /* using a fixed divider of 2 */
	int ret;

	pm_runtime_get_sync(dev->dev);

	if (dpms == DRM_MODE_DPMS_ON)
		tilcdc_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);

	/* mode.clock is in KHz, set_rate wants parameter in Hz */
	ret = clk_set_rate(priv->clk, crtc->mode.clock * 1000 * clkdiv);
	if (ret < 0) {
		dev_err(dev->dev, "failed to set display clock rate to: %d\n",
				crtc->mode.clock);
		goto out;
	}

	lcd_clk = clk_get_rate(priv->clk);

	DBG("lcd_clk=%lu, mode clock=%d, div=%u",
		lcd_clk, crtc->mode.clock, clkdiv);

	/* Configure the LCD clock divisor. */
	tilcdc_write(dev, LCDC_CTRL_REG, LCDC_CLK_DIVISOR(clkdiv) |
			LCDC_RASTER_MODE);

	if (priv->rev == 2)
		tilcdc_set(dev, LCDC_CLK_ENABLE_REG,
				LCDC_V2_DMA_CLK_EN | LCDC_V2_LIDD_CLK_EN |
				LCDC_V2_CORE_CLK_EN);

	if (dpms == DRM_MODE_DPMS_ON)
		tilcdc_crtc_dpms(crtc, DRM_MODE_DPMS_ON);

out:
	pm_runtime_put_sync(dev->dev);
}

#define SYNC_LOST_COUNT_LIMIT 50

irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc)
{
	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
	struct drm_device *dev = crtc->dev;
	struct tilcdc_drm_private *priv = dev->dev_private;
	uint32_t stat;

	stat = tilcdc_read_irqstatus(dev);
	tilcdc_clear_irqstatus(dev, stat);

	if (stat & LCDC_END_OF_FRAME0) {
		unsigned long flags;
		bool skip_event = false;
		ktime_t now;

		now = ktime_get();

		drm_flip_work_commit(&tilcdc_crtc->unref_work, priv->wq);

		spin_lock_irqsave(&tilcdc_crtc->irq_lock, flags);

		tilcdc_crtc->last_vblank = now;

		if (tilcdc_crtc->next_fb) {
			set_scanout(crtc, tilcdc_crtc->next_fb);
			tilcdc_crtc->next_fb = NULL;
			skip_event = true;
		}

		spin_unlock_irqrestore(&tilcdc_crtc->irq_lock, flags);

		drm_handle_vblank(dev, 0);

		if (!skip_event) {
			struct drm_pending_vblank_event *event;

			spin_lock_irqsave(&dev->event_lock, flags);

			event = tilcdc_crtc->event;
			tilcdc_crtc->event = NULL;
			if (event)
				drm_send_vblank_event(dev, 0, event);

			spin_unlock_irqrestore(&dev->event_lock, flags);
		}

		if (tilcdc_crtc->frame_intact)
			tilcdc_crtc->sync_lost_count = 0;
		else
			tilcdc_crtc->frame_intact = true;
	}

	if (priv->rev == 2) {
		if (stat & LCDC_FRAME_DONE) {
			tilcdc_crtc->frame_done = true;
			wake_up(&tilcdc_crtc->frame_done_wq);
		}
		tilcdc_write(dev, LCDC_END_OF_INT_IND_REG, 0);
	}

	if (stat & LCDC_SYNC_LOST) {
		dev_err_ratelimited(dev->dev, "%s(0x%08x): Sync lost",
				    __func__, stat);
		tilcdc_crtc->frame_intact = false;
		if (tilcdc_crtc->sync_lost_count++ > SYNC_LOST_COUNT_LIMIT) {
			dev_err(dev->dev,
				"%s(0x%08x): Sync lost flood detected, disabling the interrupt",
				__func__, stat);
			tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG,
				     LCDC_SYNC_LOST);
		}
	}

	if (stat & LCDC_FIFO_UNDERFLOW)
		dev_err_ratelimited(dev->dev, "%s(0x%08x): FIFO underfow",
				    __func__, stat);

	return IRQ_HANDLED;
}

struct drm_crtc *tilcdc_crtc_create(struct drm_device *dev)
{
	struct tilcdc_drm_private *priv = dev->dev_private;
	struct tilcdc_crtc *tilcdc_crtc;
	struct drm_crtc *crtc;
	int ret;

	tilcdc_crtc = devm_kzalloc(dev->dev, sizeof(*tilcdc_crtc), GFP_KERNEL);
	if (!tilcdc_crtc) {
		dev_err(dev->dev, "allocation failed\n");
		return NULL;
	}

	crtc = &tilcdc_crtc->base;

	tilcdc_crtc->dpms = DRM_MODE_DPMS_OFF;
	init_waitqueue_head(&tilcdc_crtc->frame_done_wq);

	drm_flip_work_init(&tilcdc_crtc->unref_work,
			"unref", unref_worker);

	spin_lock_init(&tilcdc_crtc->irq_lock);

	ret = drm_crtc_init(dev, crtc, &tilcdc_crtc_funcs);
	if (ret < 0)
		goto fail;

	drm_crtc_helper_add(crtc, &tilcdc_crtc_helper_funcs);

	if (priv->is_componentized) {
		struct device_node *ports =
			of_get_child_by_name(dev->dev->of_node, "ports");

		if (ports) {
			crtc->port = of_get_child_by_name(ports, "port");
			of_node_put(ports);
		} else {
			crtc->port =
				of_get_child_by_name(dev->dev->of_node, "port");
		}
		if (!crtc->port) { /* This should never happen */
			dev_err(dev->dev, "Port node not found in %s\n",
				dev->dev->of_node->full_name);
			goto fail;
		}
	}

	return crtc;

fail:
	tilcdc_crtc_destroy(crtc);
	return NULL;
}