summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/sti/sti_hdmi.c
blob: cd501563c0cc58f83b9992e7e83e09e048dfd32a (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
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
/*
 * Copyright (C) STMicroelectronics SA 2014
 * Author: Vincent Abriou <vincent.abriou@st.com> for STMicroelectronics.
 * License terms:  GNU General Public License (GPL), version 2
 */

#include <linux/clk.h>
#include <linux/component.h>
#include <linux/hdmi.h>
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/reset.h>

#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_edid.h>

#include "sti_hdmi.h"
#include "sti_hdmi_tx3g4c28phy.h"
#include "sti_hdmi_tx3g0c55phy.h"
#include "sti_vtg.h"

#define HDMI_CFG                        0x0000
#define HDMI_INT_EN                     0x0004
#define HDMI_INT_STA                    0x0008
#define HDMI_INT_CLR                    0x000C
#define HDMI_STA                        0x0010
#define HDMI_ACTIVE_VID_XMIN            0x0100
#define HDMI_ACTIVE_VID_XMAX            0x0104
#define HDMI_ACTIVE_VID_YMIN            0x0108
#define HDMI_ACTIVE_VID_YMAX            0x010C
#define HDMI_DFLT_CHL0_DAT              0x0110
#define HDMI_DFLT_CHL1_DAT              0x0114
#define HDMI_DFLT_CHL2_DAT              0x0118
#define HDMI_SW_DI_1_HEAD_WORD          0x0210
#define HDMI_SW_DI_1_PKT_WORD0          0x0214
#define HDMI_SW_DI_1_PKT_WORD1          0x0218
#define HDMI_SW_DI_1_PKT_WORD2          0x021C
#define HDMI_SW_DI_1_PKT_WORD3          0x0220
#define HDMI_SW_DI_1_PKT_WORD4          0x0224
#define HDMI_SW_DI_1_PKT_WORD5          0x0228
#define HDMI_SW_DI_1_PKT_WORD6          0x022C
#define HDMI_SW_DI_CFG                  0x0230
#define HDMI_SW_DI_2_HEAD_WORD          0x0600
#define HDMI_SW_DI_2_PKT_WORD0          0x0604
#define HDMI_SW_DI_2_PKT_WORD1          0x0608
#define HDMI_SW_DI_2_PKT_WORD2          0x060C
#define HDMI_SW_DI_2_PKT_WORD3          0x0610
#define HDMI_SW_DI_2_PKT_WORD4          0x0614
#define HDMI_SW_DI_2_PKT_WORD5          0x0618
#define HDMI_SW_DI_2_PKT_WORD6          0x061C

#define HDMI_IFRAME_SLOT_AVI            1
#define HDMI_IFRAME_SLOT_AUDIO          2

#define  XCAT(prefix, x, suffix)        prefix ## x ## suffix
#define  HDMI_SW_DI_N_HEAD_WORD(x)      XCAT(HDMI_SW_DI_, x, _HEAD_WORD)
#define  HDMI_SW_DI_N_PKT_WORD0(x)      XCAT(HDMI_SW_DI_, x, _PKT_WORD0)
#define  HDMI_SW_DI_N_PKT_WORD1(x)      XCAT(HDMI_SW_DI_, x, _PKT_WORD1)
#define  HDMI_SW_DI_N_PKT_WORD2(x)      XCAT(HDMI_SW_DI_, x, _PKT_WORD2)
#define  HDMI_SW_DI_N_PKT_WORD3(x)      XCAT(HDMI_SW_DI_, x, _PKT_WORD3)
#define  HDMI_SW_DI_N_PKT_WORD4(x)      XCAT(HDMI_SW_DI_, x, _PKT_WORD4)
#define  HDMI_SW_DI_N_PKT_WORD5(x)      XCAT(HDMI_SW_DI_, x, _PKT_WORD5)
#define  HDMI_SW_DI_N_PKT_WORD6(x)      XCAT(HDMI_SW_DI_, x, _PKT_WORD6)

#define HDMI_IFRAME_DISABLED            0x0
#define HDMI_IFRAME_SINGLE_SHOT         0x1
#define HDMI_IFRAME_FIELD               0x2
#define HDMI_IFRAME_FRAME               0x3
#define HDMI_IFRAME_MASK                0x3
#define HDMI_IFRAME_CFG_DI_N(x, n)       ((x) << ((n-1)*4)) /* n from 1 to 6 */

#define HDMI_CFG_DEVICE_EN              BIT(0)
#define HDMI_CFG_HDMI_NOT_DVI           BIT(1)
#define HDMI_CFG_HDCP_EN                BIT(2)
#define HDMI_CFG_ESS_NOT_OESS           BIT(3)
#define HDMI_CFG_H_SYNC_POL_NEG         BIT(4)
#define HDMI_CFG_SINK_TERM_DET_EN       BIT(5)
#define HDMI_CFG_V_SYNC_POL_NEG         BIT(6)
#define HDMI_CFG_422_EN                 BIT(8)
#define HDMI_CFG_FIFO_OVERRUN_CLR       BIT(12)
#define HDMI_CFG_FIFO_UNDERRUN_CLR      BIT(13)
#define HDMI_CFG_SW_RST_EN              BIT(31)

#define HDMI_INT_GLOBAL                 BIT(0)
#define HDMI_INT_SW_RST                 BIT(1)
#define HDMI_INT_PIX_CAP                BIT(3)
#define HDMI_INT_HOT_PLUG               BIT(4)
#define HDMI_INT_DLL_LCK                BIT(5)
#define HDMI_INT_NEW_FRAME              BIT(6)
#define HDMI_INT_GENCTRL_PKT            BIT(7)
#define HDMI_INT_SINK_TERM_PRESENT      BIT(11)

#define HDMI_DEFAULT_INT (HDMI_INT_SINK_TERM_PRESENT \
			| HDMI_INT_DLL_LCK \
			| HDMI_INT_HOT_PLUG \
			| HDMI_INT_GLOBAL)

#define HDMI_WORKING_INT (HDMI_INT_SINK_TERM_PRESENT \
			| HDMI_INT_GENCTRL_PKT \
			| HDMI_INT_NEW_FRAME \
			| HDMI_INT_DLL_LCK \
			| HDMI_INT_HOT_PLUG \
			| HDMI_INT_PIX_CAP \
			| HDMI_INT_SW_RST \
			| HDMI_INT_GLOBAL)

#define HDMI_STA_SW_RST                 BIT(1)

#define HDMI_INFOFRAME_HEADER_TYPE(x)    (((x) & 0xff) <<  0)
#define HDMI_INFOFRAME_HEADER_VERSION(x) (((x) & 0xff) <<  8)
#define HDMI_INFOFRAME_HEADER_LEN(x)     (((x) & 0x0f) << 16)

struct sti_hdmi_connector {
	struct drm_connector drm_connector;
	struct drm_encoder *encoder;
	struct sti_hdmi *hdmi;
};

#define to_sti_hdmi_connector(x) \
	container_of(x, struct sti_hdmi_connector, drm_connector)

u32 hdmi_read(struct sti_hdmi *hdmi, int offset)
{
	return readl(hdmi->regs + offset);
}

void hdmi_write(struct sti_hdmi *hdmi, u32 val, int offset)
{
	writel(val, hdmi->regs + offset);
}

/**
 * HDMI interrupt handler threaded
 *
 * @irq: irq number
 * @arg: connector structure
 */
static irqreturn_t hdmi_irq_thread(int irq, void *arg)
{
	struct sti_hdmi *hdmi = arg;

	/* Hot plug/unplug IRQ */
	if (hdmi->irq_status & HDMI_INT_HOT_PLUG) {
		hdmi->hpd = readl(hdmi->regs + HDMI_STA) & HDMI_STA_HOT_PLUG;
		if (hdmi->drm_dev)
			drm_helper_hpd_irq_event(hdmi->drm_dev);
	}

	/* Sw reset and PLL lock are exclusive so we can use the same
	 * event to signal them
	 */
	if (hdmi->irq_status & (HDMI_INT_SW_RST | HDMI_INT_DLL_LCK)) {
		hdmi->event_received = true;
		wake_up_interruptible(&hdmi->wait_event);
	}

	return IRQ_HANDLED;
}

/**
 * HDMI interrupt handler
 *
 * @irq: irq number
 * @arg: connector structure
 */
static irqreturn_t hdmi_irq(int irq, void *arg)
{
	struct sti_hdmi *hdmi = arg;

	/* read interrupt status */
	hdmi->irq_status = hdmi_read(hdmi, HDMI_INT_STA);

	/* clear interrupt status */
	hdmi_write(hdmi, hdmi->irq_status, HDMI_INT_CLR);

	/* force sync bus write */
	hdmi_read(hdmi, HDMI_INT_STA);

	return IRQ_WAKE_THREAD;
}

/**
 * Set hdmi active area depending on the drm display mode selected
 *
 * @hdmi: pointer on the hdmi internal structure
 */
static void hdmi_active_area(struct sti_hdmi *hdmi)
{
	u32 xmin, xmax;
	u32 ymin, ymax;

	xmin = sti_vtg_get_pixel_number(hdmi->mode, 1);
	xmax = sti_vtg_get_pixel_number(hdmi->mode, hdmi->mode.hdisplay);
	ymin = sti_vtg_get_line_number(hdmi->mode, 0);
	ymax = sti_vtg_get_line_number(hdmi->mode, hdmi->mode.vdisplay - 1);

	hdmi_write(hdmi, xmin, HDMI_ACTIVE_VID_XMIN);
	hdmi_write(hdmi, xmax, HDMI_ACTIVE_VID_XMAX);
	hdmi_write(hdmi, ymin, HDMI_ACTIVE_VID_YMIN);
	hdmi_write(hdmi, ymax, HDMI_ACTIVE_VID_YMAX);
}

/**
 * Overall hdmi configuration
 *
 * @hdmi: pointer on the hdmi internal structure
 */
static void hdmi_config(struct sti_hdmi *hdmi)
{
	u32 conf;

	DRM_DEBUG_DRIVER("\n");

	/* Clear overrun and underrun fifo */
	conf = HDMI_CFG_FIFO_OVERRUN_CLR | HDMI_CFG_FIFO_UNDERRUN_CLR;

	/* Enable HDMI mode not DVI */
	conf |= HDMI_CFG_HDMI_NOT_DVI | HDMI_CFG_ESS_NOT_OESS;

	/* Enable sink term detection */
	conf |= HDMI_CFG_SINK_TERM_DET_EN;

	/* Set Hsync polarity */
	if (hdmi->mode.flags & DRM_MODE_FLAG_NHSYNC) {
		DRM_DEBUG_DRIVER("H Sync Negative\n");
		conf |= HDMI_CFG_H_SYNC_POL_NEG;
	}

	/* Set Vsync polarity */
	if (hdmi->mode.flags & DRM_MODE_FLAG_NVSYNC) {
		DRM_DEBUG_DRIVER("V Sync Negative\n");
		conf |= HDMI_CFG_V_SYNC_POL_NEG;
	}

	/* Enable HDMI */
	conf |= HDMI_CFG_DEVICE_EN;

	hdmi_write(hdmi, conf, HDMI_CFG);
}

/**
 * Helper to concatenate infoframe in 32 bits word
 *
 * @ptr: pointer on the hdmi internal structure
 * @data: infoframe to write
 * @size: size to write
 */
static inline unsigned int hdmi_infoframe_subpack(const u8 *ptr, size_t size)
{
	unsigned long value = 0;
	size_t i;

	for (i = size; i > 0; i--)
		value = (value << 8) | ptr[i - 1];

	return value;
}

/**
 * Helper to write info frame
 *
 * @hdmi: pointer on the hdmi internal structure
 * @data: infoframe to write
 * @size: size to write
 */
static void hdmi_infoframe_write_infopack(struct sti_hdmi *hdmi, const u8 *data)
{
	const u8 *ptr = data;
	u32 val, slot, mode, i;
	u32 head_offset, pack_offset;
	size_t size;

	switch (*ptr) {
	case HDMI_INFOFRAME_TYPE_AVI:
		slot = HDMI_IFRAME_SLOT_AVI;
		mode = HDMI_IFRAME_FIELD;
		head_offset = HDMI_SW_DI_N_HEAD_WORD(HDMI_IFRAME_SLOT_AVI);
		pack_offset = HDMI_SW_DI_N_PKT_WORD0(HDMI_IFRAME_SLOT_AVI);
		size = HDMI_AVI_INFOFRAME_SIZE;
		break;

	case HDMI_INFOFRAME_TYPE_AUDIO:
		slot = HDMI_IFRAME_SLOT_AUDIO;
		mode = HDMI_IFRAME_FRAME;
		head_offset = HDMI_SW_DI_N_HEAD_WORD(HDMI_IFRAME_SLOT_AUDIO);
		pack_offset = HDMI_SW_DI_N_PKT_WORD0(HDMI_IFRAME_SLOT_AUDIO);
		size = HDMI_AUDIO_INFOFRAME_SIZE;
		break;

	default:
		DRM_ERROR("unsupported infoframe type: %#x\n", *ptr);
		return;
	}

	/* Disable transmission slot for updated infoframe */
	val = hdmi_read(hdmi, HDMI_SW_DI_CFG);
	val &= ~HDMI_IFRAME_CFG_DI_N(HDMI_IFRAME_MASK, slot);
	hdmi_write(hdmi, val, HDMI_SW_DI_CFG);

	val = HDMI_INFOFRAME_HEADER_TYPE(*ptr++);
	val |= HDMI_INFOFRAME_HEADER_VERSION(*ptr++);
	val |= HDMI_INFOFRAME_HEADER_LEN(*ptr++);
	writel(val, hdmi->regs + head_offset);

	/*
	 * Each subpack contains 4 bytes
	 * The First Bytes of the first subpacket must contain the checksum
	 * Packet size in increase by one.
	 */
	for (i = 0; i < size; i += sizeof(u32)) {
		size_t num;

		num = min_t(size_t, size - i, sizeof(u32));
		val = hdmi_infoframe_subpack(ptr, num);
		ptr += sizeof(u32);
		writel(val, hdmi->regs + pack_offset + i);
	}

	/* Enable transmission slot for updated infoframe */
	val = hdmi_read(hdmi, HDMI_SW_DI_CFG);
	val |= HDMI_IFRAME_CFG_DI_N(HDMI_IFRAME_FIELD, slot);
	hdmi_write(hdmi, val, HDMI_SW_DI_CFG);
}

/**
 * Prepare and configure the AVI infoframe
 *
 * AVI infoframe are transmitted at least once per two video field and
 * contains information about HDMI transmission mode such as color space,
 * colorimetry, ...
 *
 * @hdmi: pointer on the hdmi internal structure
 *
 * Return negative value if error occurs
 */
static int hdmi_avi_infoframe_config(struct sti_hdmi *hdmi)
{
	struct drm_display_mode *mode = &hdmi->mode;
	struct hdmi_avi_infoframe infoframe;
	u8 buffer[HDMI_INFOFRAME_SIZE(AVI)];
	int ret;

	DRM_DEBUG_DRIVER("\n");

	ret = drm_hdmi_avi_infoframe_from_display_mode(&infoframe, mode);
	if (ret < 0) {
		DRM_ERROR("failed to setup AVI infoframe: %d\n", ret);
		return ret;
	}

	/* fixed infoframe configuration not linked to the mode */
	infoframe.colorspace = HDMI_COLORSPACE_RGB;
	infoframe.quantization_range = HDMI_QUANTIZATION_RANGE_DEFAULT;
	infoframe.colorimetry = HDMI_COLORIMETRY_NONE;

	ret = hdmi_avi_infoframe_pack(&infoframe, buffer, sizeof(buffer));
	if (ret < 0) {
		DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
		return ret;
	}

	hdmi_infoframe_write_infopack(hdmi, buffer);

	return 0;
}

/**
 * Prepare and configure the AUDIO infoframe
 *
 * AUDIO infoframe are transmitted once per frame and
 * contains information about HDMI transmission mode such as audio codec,
 * sample size, ...
 *
 * @hdmi: pointer on the hdmi internal structure
 *
 * Return negative value if error occurs
 */
static int hdmi_audio_infoframe_config(struct sti_hdmi *hdmi)
{
	struct hdmi_audio_infoframe infofame;
	u8 buffer[HDMI_INFOFRAME_SIZE(AUDIO)];
	int ret;

	ret = hdmi_audio_infoframe_init(&infofame);
	if (ret < 0) {
		DRM_ERROR("failed to setup audio infoframe: %d\n", ret);
		return ret;
	}

	infofame.channels = 2;

	ret = hdmi_audio_infoframe_pack(&infofame, buffer, sizeof(buffer));
	if (ret < 0) {
		DRM_ERROR("failed to pack audio infoframe: %d\n", ret);
		return ret;
	}

	hdmi_infoframe_write_infopack(hdmi, buffer);

	return 0;
}

/**
 * Software reset of the hdmi subsystem
 *
 * @hdmi: pointer on the hdmi internal structure
 *
 */
#define HDMI_TIMEOUT_SWRESET  100   /*milliseconds */
static void hdmi_swreset(struct sti_hdmi *hdmi)
{
	u32 val;

	DRM_DEBUG_DRIVER("\n");

	/* Enable hdmi_audio clock only during hdmi reset */
	if (clk_prepare_enable(hdmi->clk_audio))
		DRM_INFO("Failed to prepare/enable hdmi_audio clk\n");

	/* Sw reset */
	hdmi->event_received = false;

	val = hdmi_read(hdmi, HDMI_CFG);
	val |= HDMI_CFG_SW_RST_EN;
	hdmi_write(hdmi, val, HDMI_CFG);

	/* Wait reset completed */
	wait_event_interruptible_timeout(hdmi->wait_event,
					 hdmi->event_received == true,
					 msecs_to_jiffies
					 (HDMI_TIMEOUT_SWRESET));

	/*
	 * HDMI_STA_SW_RST bit is set to '1' when SW_RST bit in HDMI_CFG is
	 * set to '1' and clk_audio is running.
	 */
	if ((hdmi_read(hdmi, HDMI_STA) & HDMI_STA_SW_RST) == 0)
		DRM_DEBUG_DRIVER("Warning: HDMI sw reset timeout occurs\n");

	val = hdmi_read(hdmi, HDMI_CFG);
	val &= ~HDMI_CFG_SW_RST_EN;
	hdmi_write(hdmi, val, HDMI_CFG);

	/* Disable hdmi_audio clock. Not used anymore for drm purpose */
	clk_disable_unprepare(hdmi->clk_audio);
}

static void sti_hdmi_disable(struct drm_bridge *bridge)
{
	struct sti_hdmi *hdmi = bridge->driver_private;

	u32 val = hdmi_read(hdmi, HDMI_CFG);

	if (!hdmi->enabled)
		return;

	DRM_DEBUG_DRIVER("\n");

	/* Disable HDMI */
	val &= ~HDMI_CFG_DEVICE_EN;
	hdmi_write(hdmi, val, HDMI_CFG);

	hdmi_write(hdmi, 0xffffffff, HDMI_INT_CLR);

	/* Stop the phy */
	hdmi->phy_ops->stop(hdmi);

	/* Set the default channel data to be a dark red */
	hdmi_write(hdmi, 0x0000, HDMI_DFLT_CHL0_DAT);
	hdmi_write(hdmi, 0x0000, HDMI_DFLT_CHL1_DAT);
	hdmi_write(hdmi, 0x0060, HDMI_DFLT_CHL2_DAT);

	/* Disable/unprepare hdmi clock */
	clk_disable_unprepare(hdmi->clk_phy);
	clk_disable_unprepare(hdmi->clk_tmds);
	clk_disable_unprepare(hdmi->clk_pix);

	hdmi->enabled = false;
}

static void sti_hdmi_pre_enable(struct drm_bridge *bridge)
{
	struct sti_hdmi *hdmi = bridge->driver_private;

	DRM_DEBUG_DRIVER("\n");

	if (hdmi->enabled)
		return;

	/* Prepare/enable clocks */
	if (clk_prepare_enable(hdmi->clk_pix))
		DRM_ERROR("Failed to prepare/enable hdmi_pix clk\n");
	if (clk_prepare_enable(hdmi->clk_tmds))
		DRM_ERROR("Failed to prepare/enable hdmi_tmds clk\n");
	if (clk_prepare_enable(hdmi->clk_phy))
		DRM_ERROR("Failed to prepare/enable hdmi_rejec_pll clk\n");

	hdmi->enabled = true;

	/* Program hdmi serializer and start phy */
	if (!hdmi->phy_ops->start(hdmi)) {
		DRM_ERROR("Unable to start hdmi phy\n");
		return;
	}

	/* Program hdmi active area */
	hdmi_active_area(hdmi);

	/* Enable working interrupts */
	hdmi_write(hdmi, HDMI_WORKING_INT, HDMI_INT_EN);

	/* Program hdmi config */
	hdmi_config(hdmi);

	/* Program AVI infoframe */
	if (hdmi_avi_infoframe_config(hdmi))
		DRM_ERROR("Unable to configure AVI infoframe\n");

	/* Program AUDIO infoframe */
	if (hdmi_audio_infoframe_config(hdmi))
		DRM_ERROR("Unable to configure AUDIO infoframe\n");

	/* Sw reset */
	hdmi_swreset(hdmi);
}

static void sti_hdmi_set_mode(struct drm_bridge *bridge,
		struct drm_display_mode *mode,
		struct drm_display_mode *adjusted_mode)
{
	struct sti_hdmi *hdmi = bridge->driver_private;
	int ret;

	DRM_DEBUG_DRIVER("\n");

	/* Copy the drm display mode in the connector local structure */
	memcpy(&hdmi->mode, mode, sizeof(struct drm_display_mode));

	/* Update clock framerate according to the selected mode */
	ret = clk_set_rate(hdmi->clk_pix, mode->clock * 1000);
	if (ret < 0) {
		DRM_ERROR("Cannot set rate (%dHz) for hdmi_pix clk\n",
			  mode->clock * 1000);
		return;
	}
	ret = clk_set_rate(hdmi->clk_phy, mode->clock * 1000);
	if (ret < 0) {
		DRM_ERROR("Cannot set rate (%dHz) for hdmi_rejection_pll clk\n",
			  mode->clock * 1000);
		return;
	}
}

static void sti_hdmi_bridge_nope(struct drm_bridge *bridge)
{
	/* do nothing */
}

static const struct drm_bridge_funcs sti_hdmi_bridge_funcs = {
	.pre_enable = sti_hdmi_pre_enable,
	.enable = sti_hdmi_bridge_nope,
	.disable = sti_hdmi_disable,
	.post_disable = sti_hdmi_bridge_nope,
	.mode_set = sti_hdmi_set_mode,
};

static int sti_hdmi_connector_get_modes(struct drm_connector *connector)
{
	struct sti_hdmi_connector *hdmi_connector
		= to_sti_hdmi_connector(connector);
	struct sti_hdmi *hdmi = hdmi_connector->hdmi;
	struct edid *edid;
	int count;

	DRM_DEBUG_DRIVER("\n");

	edid = drm_get_edid(connector, hdmi->ddc_adapt);
	if (!edid)
		goto fail;

	count = drm_add_edid_modes(connector, edid);
	drm_mode_connector_update_edid_property(connector, edid);

	kfree(edid);
	return count;

fail:
	DRM_ERROR("Can't read HDMI EDID\n");
	return 0;
}

#define CLK_TOLERANCE_HZ 50

static int sti_hdmi_connector_mode_valid(struct drm_connector *connector,
					struct drm_display_mode *mode)
{
	int target = mode->clock * 1000;
	int target_min = target - CLK_TOLERANCE_HZ;
	int target_max = target + CLK_TOLERANCE_HZ;
	int result;
	struct sti_hdmi_connector *hdmi_connector
		= to_sti_hdmi_connector(connector);
	struct sti_hdmi *hdmi = hdmi_connector->hdmi;


	result = clk_round_rate(hdmi->clk_pix, target);

	DRM_DEBUG_DRIVER("target rate = %d => available rate = %d\n",
			 target, result);

	if ((result < target_min) || (result > target_max)) {
		DRM_DEBUG_DRIVER("hdmi pixclk=%d not supported\n", target);
		return MODE_BAD;
	}

	return MODE_OK;
}

struct drm_encoder *sti_hdmi_best_encoder(struct drm_connector *connector)
{
	struct sti_hdmi_connector *hdmi_connector
		= to_sti_hdmi_connector(connector);

	/* Best encoder is the one associated during connector creation */
	return hdmi_connector->encoder;
}

static const
struct drm_connector_helper_funcs sti_hdmi_connector_helper_funcs = {
	.get_modes = sti_hdmi_connector_get_modes,
	.mode_valid = sti_hdmi_connector_mode_valid,
	.best_encoder = sti_hdmi_best_encoder,
};

/* get detection status of display device */
static enum drm_connector_status
sti_hdmi_connector_detect(struct drm_connector *connector, bool force)
{
	struct sti_hdmi_connector *hdmi_connector
		= to_sti_hdmi_connector(connector);
	struct sti_hdmi *hdmi = hdmi_connector->hdmi;

	DRM_DEBUG_DRIVER("\n");

	if (hdmi->hpd) {
		DRM_DEBUG_DRIVER("hdmi cable connected\n");
		return connector_status_connected;
	}

	DRM_DEBUG_DRIVER("hdmi cable disconnected\n");
	return connector_status_disconnected;
}

static void sti_hdmi_connector_destroy(struct drm_connector *connector)
{
	struct sti_hdmi_connector *hdmi_connector
		= to_sti_hdmi_connector(connector);

	drm_connector_unregister(connector);
	drm_connector_cleanup(connector);
	kfree(hdmi_connector);
}

static const struct drm_connector_funcs sti_hdmi_connector_funcs = {
	.dpms = drm_atomic_helper_connector_dpms,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.detect = sti_hdmi_connector_detect,
	.destroy = sti_hdmi_connector_destroy,
	.reset = drm_atomic_helper_connector_reset,
	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};

static struct drm_encoder *sti_hdmi_find_encoder(struct drm_device *dev)
{
	struct drm_encoder *encoder;

	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
		if (encoder->encoder_type == DRM_MODE_ENCODER_TMDS)
			return encoder;
	}

	return NULL;
}

static int sti_hdmi_bind(struct device *dev, struct device *master, void *data)
{
	struct sti_hdmi *hdmi = dev_get_drvdata(dev);
	struct drm_device *drm_dev = data;
	struct drm_encoder *encoder;
	struct sti_hdmi_connector *connector;
	struct drm_connector *drm_connector;
	struct drm_bridge *bridge;
	int err;

	/* Set the drm device handle */
	hdmi->drm_dev = drm_dev;

	encoder = sti_hdmi_find_encoder(drm_dev);
	if (!encoder)
		return -EINVAL;

	connector = devm_kzalloc(dev, sizeof(*connector), GFP_KERNEL);
	if (!connector)
		return -EINVAL;

	connector->hdmi = hdmi;

	bridge = devm_kzalloc(dev, sizeof(*bridge), GFP_KERNEL);
	if (!bridge)
		return -EINVAL;

	bridge->driver_private = hdmi;
	bridge->funcs = &sti_hdmi_bridge_funcs;
	drm_bridge_attach(drm_dev, bridge);

	encoder->bridge = bridge;
	connector->encoder = encoder;

	drm_connector = (struct drm_connector *)connector;

	drm_connector->polled = DRM_CONNECTOR_POLL_HPD;

	drm_connector_init(drm_dev, drm_connector,
			&sti_hdmi_connector_funcs, DRM_MODE_CONNECTOR_HDMIA);
	drm_connector_helper_add(drm_connector,
			&sti_hdmi_connector_helper_funcs);

	err = drm_connector_register(drm_connector);
	if (err)
		goto err_connector;

	err = drm_mode_connector_attach_encoder(drm_connector, encoder);
	if (err) {
		DRM_ERROR("Failed to attach a connector to a encoder\n");
		goto err_sysfs;
	}

	/* Enable default interrupts */
	hdmi_write(hdmi, HDMI_DEFAULT_INT, HDMI_INT_EN);

	return 0;

err_sysfs:
	drm_connector_unregister(drm_connector);
err_connector:
	drm_connector_cleanup(drm_connector);

	return -EINVAL;
}

static void sti_hdmi_unbind(struct device *dev,
		struct device *master, void *data)
{
	/* do nothing */
}

static const struct component_ops sti_hdmi_ops = {
	.bind = sti_hdmi_bind,
	.unbind = sti_hdmi_unbind,
};

static const struct of_device_id hdmi_of_match[] = {
	{
		.compatible = "st,stih416-hdmi",
		.data = &tx3g0c55phy_ops,
	}, {
		.compatible = "st,stih407-hdmi",
		.data = &tx3g4c28phy_ops,
	}, {
		/* end node */
	}
};
MODULE_DEVICE_TABLE(of, hdmi_of_match);

static int sti_hdmi_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct sti_hdmi *hdmi;
	struct device_node *np = dev->of_node;
	struct resource *res;
	struct device_node *ddc;
	int ret;

	DRM_INFO("%s\n", __func__);

	hdmi = devm_kzalloc(dev, sizeof(*hdmi), GFP_KERNEL);
	if (!hdmi)
		return -ENOMEM;

	ddc = of_parse_phandle(pdev->dev.of_node, "ddc", 0);
	if (ddc) {
		hdmi->ddc_adapt = of_get_i2c_adapter_by_node(ddc);
		of_node_put(ddc);
		if (!hdmi->ddc_adapt)
			return -EPROBE_DEFER;
	}

	hdmi->dev = pdev->dev;

	/* Get resources */
	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "hdmi-reg");
	if (!res) {
		DRM_ERROR("Invalid hdmi resource\n");
		ret = -ENOMEM;
		goto release_adapter;
	}
	hdmi->regs = devm_ioremap_nocache(dev, res->start, resource_size(res));
	if (!hdmi->regs) {
		ret = -ENOMEM;
		goto release_adapter;
	}

	if (of_device_is_compatible(np, "st,stih416-hdmi")) {
		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
						   "syscfg");
		if (!res) {
			DRM_ERROR("Invalid syscfg resource\n");
			ret = -ENOMEM;
			goto release_adapter;
		}
		hdmi->syscfg = devm_ioremap_nocache(dev, res->start,
						    resource_size(res));
		if (!hdmi->syscfg) {
			ret = -ENOMEM;
			goto release_adapter;
		}
	}

	hdmi->phy_ops = (struct hdmi_phy_ops *)
		of_match_node(hdmi_of_match, np)->data;

	/* Get clock resources */
	hdmi->clk_pix = devm_clk_get(dev, "pix");
	if (IS_ERR(hdmi->clk_pix)) {
		DRM_ERROR("Cannot get hdmi_pix clock\n");
		ret = PTR_ERR(hdmi->clk_pix);
		goto release_adapter;
	}

	hdmi->clk_tmds = devm_clk_get(dev, "tmds");
	if (IS_ERR(hdmi->clk_tmds)) {
		DRM_ERROR("Cannot get hdmi_tmds clock\n");
		ret = PTR_ERR(hdmi->clk_tmds);
		goto release_adapter;
	}

	hdmi->clk_phy = devm_clk_get(dev, "phy");
	if (IS_ERR(hdmi->clk_phy)) {
		DRM_ERROR("Cannot get hdmi_phy clock\n");
		ret = PTR_ERR(hdmi->clk_phy);
		goto release_adapter;
	}

	hdmi->clk_audio = devm_clk_get(dev, "audio");
	if (IS_ERR(hdmi->clk_audio)) {
		DRM_ERROR("Cannot get hdmi_audio clock\n");
		ret = PTR_ERR(hdmi->clk_audio);
		goto release_adapter;
	}

	hdmi->hpd = readl(hdmi->regs + HDMI_STA) & HDMI_STA_HOT_PLUG;

	init_waitqueue_head(&hdmi->wait_event);

	hdmi->irq = platform_get_irq_byname(pdev, "irq");

	ret = devm_request_threaded_irq(dev, hdmi->irq, hdmi_irq,
			hdmi_irq_thread, IRQF_ONESHOT, dev_name(dev), hdmi);
	if (ret) {
		DRM_ERROR("Failed to register HDMI interrupt\n");
		goto release_adapter;
	}

	hdmi->reset = devm_reset_control_get(dev, "hdmi");
	/* Take hdmi out of reset */
	if (!IS_ERR(hdmi->reset))
		reset_control_deassert(hdmi->reset);

	platform_set_drvdata(pdev, hdmi);

	return component_add(&pdev->dev, &sti_hdmi_ops);

 release_adapter:
	i2c_put_adapter(hdmi->ddc_adapt);

	return ret;
}

static int sti_hdmi_remove(struct platform_device *pdev)
{
	struct sti_hdmi *hdmi = dev_get_drvdata(&pdev->dev);

	i2c_put_adapter(hdmi->ddc_adapt);
	component_del(&pdev->dev, &sti_hdmi_ops);

	return 0;
}

struct platform_driver sti_hdmi_driver = {
	.driver = {
		.name = "sti-hdmi",
		.owner = THIS_MODULE,
		.of_match_table = hdmi_of_match,
	},
	.probe = sti_hdmi_probe,
	.remove = sti_hdmi_remove,
};

MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
MODULE_LICENSE("GPL");