summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/zte/zx_hdmi.c
blob: b8abb1b496ff5b56c8f3e51e4dc54cbcd0b369d4 (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
/*
 * Copyright 2016 Linaro Ltd.
 * Copyright 2016 ZTE Corporation.
 *
 * 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.
 *
 */

#include <linux/clk.h>
#include <linux/component.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/hdmi.h>
#include <linux/irq.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of_device.h>

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

#include <sound/hdmi-codec.h>

#include "zx_hdmi_regs.h"
#include "zx_vou.h"

#define ZX_HDMI_INFOFRAME_SIZE		31
#define DDC_SEGMENT_ADDR		0x30

struct zx_hdmi_i2c {
	struct i2c_adapter adap;
	struct mutex lock;
};

struct zx_hdmi {
	struct drm_connector connector;
	struct drm_encoder encoder;
	struct zx_hdmi_i2c *ddc;
	struct device *dev;
	struct drm_device *drm;
	void __iomem *mmio;
	struct clk *cec_clk;
	struct clk *osc_clk;
	struct clk *xclk;
	bool sink_is_hdmi;
	bool sink_has_audio;
	struct platform_device *audio_pdev;
};

#define to_zx_hdmi(x) container_of(x, struct zx_hdmi, x)

static inline u8 hdmi_readb(struct zx_hdmi *hdmi, u16 offset)
{
	return readl_relaxed(hdmi->mmio + offset * 4);
}

static inline void hdmi_writeb(struct zx_hdmi *hdmi, u16 offset, u8 val)
{
	writel_relaxed(val, hdmi->mmio + offset * 4);
}

static inline void hdmi_writeb_mask(struct zx_hdmi *hdmi, u16 offset,
				    u8 mask, u8 val)
{
	u8 tmp;

	tmp = hdmi_readb(hdmi, offset);
	tmp = (tmp & ~mask) | (val & mask);
	hdmi_writeb(hdmi, offset, tmp);
}

static int zx_hdmi_infoframe_trans(struct zx_hdmi *hdmi,
				   union hdmi_infoframe *frame, u8 fsel)
{
	u8 buffer[ZX_HDMI_INFOFRAME_SIZE];
	int num;
	int i;

	hdmi_writeb(hdmi, TPI_INFO_FSEL, fsel);

	num = hdmi_infoframe_pack(frame, buffer, ZX_HDMI_INFOFRAME_SIZE);
	if (num < 0) {
		DRM_DEV_ERROR(hdmi->dev, "failed to pack infoframe: %d\n", num);
		return num;
	}

	for (i = 0; i < num; i++)
		hdmi_writeb(hdmi, TPI_INFO_B0 + i, buffer[i]);

	hdmi_writeb_mask(hdmi, TPI_INFO_EN, TPI_INFO_TRANS_RPT,
			 TPI_INFO_TRANS_RPT);
	hdmi_writeb_mask(hdmi, TPI_INFO_EN, TPI_INFO_TRANS_EN,
			 TPI_INFO_TRANS_EN);

	return num;
}

static int zx_hdmi_config_video_vsi(struct zx_hdmi *hdmi,
				    struct drm_display_mode *mode)
{
	union hdmi_infoframe frame;
	int ret;

	ret = drm_hdmi_vendor_infoframe_from_display_mode(&frame.vendor.hdmi,
							  mode);
	if (ret) {
		DRM_DEV_ERROR(hdmi->dev, "failed to get vendor infoframe: %d\n",
			      ret);
		return ret;
	}

	return zx_hdmi_infoframe_trans(hdmi, &frame, FSEL_VSIF);
}

static int zx_hdmi_config_video_avi(struct zx_hdmi *hdmi,
				    struct drm_display_mode *mode)
{
	union hdmi_infoframe frame;
	int ret;

	ret = drm_hdmi_avi_infoframe_from_display_mode(&frame.avi, mode, false);
	if (ret) {
		DRM_DEV_ERROR(hdmi->dev, "failed to get avi infoframe: %d\n",
			      ret);
		return ret;
	}

	/* We always use YUV444 for HDMI output. */
	frame.avi.colorspace = HDMI_COLORSPACE_YUV444;

	return zx_hdmi_infoframe_trans(hdmi, &frame, FSEL_AVI);
}

static void zx_hdmi_encoder_mode_set(struct drm_encoder *encoder,
				     struct drm_display_mode *mode,
				     struct drm_display_mode *adj_mode)
{
	struct zx_hdmi *hdmi = to_zx_hdmi(encoder);

	if (hdmi->sink_is_hdmi) {
		zx_hdmi_config_video_avi(hdmi, mode);
		zx_hdmi_config_video_vsi(hdmi, mode);
	}
}

static void zx_hdmi_phy_start(struct zx_hdmi *hdmi)
{
	/* Copy from ZTE BSP code */
	hdmi_writeb(hdmi, 0x222, 0x0);
	hdmi_writeb(hdmi, 0x224, 0x4);
	hdmi_writeb(hdmi, 0x909, 0x0);
	hdmi_writeb(hdmi, 0x7b0, 0x90);
	hdmi_writeb(hdmi, 0x7b1, 0x00);
	hdmi_writeb(hdmi, 0x7b2, 0xa7);
	hdmi_writeb(hdmi, 0x7b8, 0xaa);
	hdmi_writeb(hdmi, 0x7b2, 0xa7);
	hdmi_writeb(hdmi, 0x7b3, 0x0f);
	hdmi_writeb(hdmi, 0x7b4, 0x0f);
	hdmi_writeb(hdmi, 0x7b5, 0x55);
	hdmi_writeb(hdmi, 0x7b7, 0x03);
	hdmi_writeb(hdmi, 0x7b9, 0x12);
	hdmi_writeb(hdmi, 0x7ba, 0x32);
	hdmi_writeb(hdmi, 0x7bc, 0x68);
	hdmi_writeb(hdmi, 0x7be, 0x40);
	hdmi_writeb(hdmi, 0x7bf, 0x84);
	hdmi_writeb(hdmi, 0x7c1, 0x0f);
	hdmi_writeb(hdmi, 0x7c8, 0x02);
	hdmi_writeb(hdmi, 0x7c9, 0x03);
	hdmi_writeb(hdmi, 0x7ca, 0x40);
	hdmi_writeb(hdmi, 0x7dc, 0x31);
	hdmi_writeb(hdmi, 0x7e2, 0x04);
	hdmi_writeb(hdmi, 0x7e0, 0x06);
	hdmi_writeb(hdmi, 0x7cb, 0x68);
	hdmi_writeb(hdmi, 0x7f9, 0x02);
	hdmi_writeb(hdmi, 0x7b6, 0x02);
	hdmi_writeb(hdmi, 0x7f3, 0x0);
}

static void zx_hdmi_hw_enable(struct zx_hdmi *hdmi)
{
	/* Enable pclk */
	hdmi_writeb_mask(hdmi, CLKPWD, CLKPWD_PDIDCK, CLKPWD_PDIDCK);

	/* Enable HDMI for TX */
	hdmi_writeb_mask(hdmi, FUNC_SEL, FUNC_HDMI_EN, FUNC_HDMI_EN);

	/* Enable deep color packet */
	hdmi_writeb_mask(hdmi, P2T_CTRL, P2T_DC_PKT_EN, P2T_DC_PKT_EN);

	/* Enable HDMI/MHL mode for output */
	hdmi_writeb_mask(hdmi, TEST_TXCTRL, TEST_TXCTRL_HDMI_MODE,
			 TEST_TXCTRL_HDMI_MODE);

	/* Configure reg_qc_sel */
	hdmi_writeb(hdmi, HDMICTL4, 0x3);

	/* Enable interrupt */
	hdmi_writeb_mask(hdmi, INTR1_MASK, INTR1_MONITOR_DETECT,
			 INTR1_MONITOR_DETECT);

	/* Start up phy */
	zx_hdmi_phy_start(hdmi);
}

static void zx_hdmi_hw_disable(struct zx_hdmi *hdmi)
{
	/* Disable interrupt */
	hdmi_writeb_mask(hdmi, INTR1_MASK, INTR1_MONITOR_DETECT, 0);

	/* Disable deep color packet */
	hdmi_writeb_mask(hdmi, P2T_CTRL, P2T_DC_PKT_EN, P2T_DC_PKT_EN);

	/* Disable HDMI for TX */
	hdmi_writeb_mask(hdmi, FUNC_SEL, FUNC_HDMI_EN, 0);

	/* Disable pclk */
	hdmi_writeb_mask(hdmi, CLKPWD, CLKPWD_PDIDCK, 0);
}

static void zx_hdmi_encoder_enable(struct drm_encoder *encoder)
{
	struct zx_hdmi *hdmi = to_zx_hdmi(encoder);

	clk_prepare_enable(hdmi->cec_clk);
	clk_prepare_enable(hdmi->osc_clk);
	clk_prepare_enable(hdmi->xclk);

	zx_hdmi_hw_enable(hdmi);

	vou_inf_enable(VOU_HDMI, encoder->crtc);
}

static void zx_hdmi_encoder_disable(struct drm_encoder *encoder)
{
	struct zx_hdmi *hdmi = to_zx_hdmi(encoder);

	vou_inf_disable(VOU_HDMI, encoder->crtc);

	zx_hdmi_hw_disable(hdmi);

	clk_disable_unprepare(hdmi->xclk);
	clk_disable_unprepare(hdmi->osc_clk);
	clk_disable_unprepare(hdmi->cec_clk);
}

static const struct drm_encoder_helper_funcs zx_hdmi_encoder_helper_funcs = {
	.enable	= zx_hdmi_encoder_enable,
	.disable = zx_hdmi_encoder_disable,
	.mode_set = zx_hdmi_encoder_mode_set,
};

static const struct drm_encoder_funcs zx_hdmi_encoder_funcs = {
	.destroy = drm_encoder_cleanup,
};

static int zx_hdmi_connector_get_modes(struct drm_connector *connector)
{
	struct zx_hdmi *hdmi = to_zx_hdmi(connector);
	struct edid *edid;
	int ret;

	edid = drm_get_edid(connector, &hdmi->ddc->adap);
	if (!edid)
		return 0;

	hdmi->sink_is_hdmi = drm_detect_hdmi_monitor(edid);
	hdmi->sink_has_audio = drm_detect_monitor_audio(edid);
	drm_mode_connector_update_edid_property(connector, edid);
	ret = drm_add_edid_modes(connector, edid);
	kfree(edid);

	return ret;
}

static enum drm_mode_status
zx_hdmi_connector_mode_valid(struct drm_connector *connector,
			     struct drm_display_mode *mode)
{
	return MODE_OK;
}

static struct drm_connector_helper_funcs zx_hdmi_connector_helper_funcs = {
	.get_modes = zx_hdmi_connector_get_modes,
	.mode_valid = zx_hdmi_connector_mode_valid,
};

static enum drm_connector_status
zx_hdmi_connector_detect(struct drm_connector *connector, bool force)
{
	struct zx_hdmi *hdmi = to_zx_hdmi(connector);

	return (hdmi_readb(hdmi, TPI_HPD_RSEN) & TPI_HPD_CONNECTION) ?
		connector_status_connected : connector_status_disconnected;
}

static const struct drm_connector_funcs zx_hdmi_connector_funcs = {
	.fill_modes = drm_helper_probe_single_connector_modes,
	.detect = zx_hdmi_connector_detect,
	.destroy = drm_connector_cleanup,
	.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 int zx_hdmi_register(struct drm_device *drm, struct zx_hdmi *hdmi)
{
	struct drm_encoder *encoder = &hdmi->encoder;

	encoder->possible_crtcs = VOU_CRTC_MASK;

	drm_encoder_init(drm, encoder, &zx_hdmi_encoder_funcs,
			 DRM_MODE_ENCODER_TMDS, NULL);
	drm_encoder_helper_add(encoder, &zx_hdmi_encoder_helper_funcs);

	hdmi->connector.polled = DRM_CONNECTOR_POLL_HPD;

	drm_connector_init(drm, &hdmi->connector, &zx_hdmi_connector_funcs,
			   DRM_MODE_CONNECTOR_HDMIA);
	drm_connector_helper_add(&hdmi->connector,
				 &zx_hdmi_connector_helper_funcs);

	drm_mode_connector_attach_encoder(&hdmi->connector, encoder);

	return 0;
}

static irqreturn_t zx_hdmi_irq_thread(int irq, void *dev_id)
{
	struct zx_hdmi *hdmi = dev_id;

	drm_helper_hpd_irq_event(hdmi->connector.dev);

	return IRQ_HANDLED;
}

static irqreturn_t zx_hdmi_irq_handler(int irq, void *dev_id)
{
	struct zx_hdmi *hdmi = dev_id;
	u8 lstat;

	lstat = hdmi_readb(hdmi, L1_INTR_STAT);

	/* Monitor detect/HPD interrupt */
	if (lstat & L1_INTR_STAT_INTR1) {
		u8 stat;

		stat = hdmi_readb(hdmi, INTR1_STAT);
		hdmi_writeb(hdmi, INTR1_STAT, stat);

		if (stat & INTR1_MONITOR_DETECT)
			return IRQ_WAKE_THREAD;
	}

	return IRQ_NONE;
}

static int zx_hdmi_audio_startup(struct device *dev, void *data)
{
	struct zx_hdmi *hdmi = dev_get_drvdata(dev);
	struct drm_encoder *encoder = &hdmi->encoder;

	vou_inf_hdmi_audio_sel(encoder->crtc, VOU_HDMI_AUD_SPDIF);

	return 0;
}

static void zx_hdmi_audio_shutdown(struct device *dev, void *data)
{
	struct zx_hdmi *hdmi = dev_get_drvdata(dev);

	/* Disable audio input */
	hdmi_writeb_mask(hdmi, AUD_EN, AUD_IN_EN, 0);
}

static inline int zx_hdmi_audio_get_n(unsigned int fs)
{
	unsigned int n;

	if (fs && (fs % 44100) == 0)
		n = 6272 * (fs / 44100);
	else
		n = fs * 128 / 1000;

	return n;
}

static int zx_hdmi_audio_hw_params(struct device *dev,
				   void *data,
				   struct hdmi_codec_daifmt *daifmt,
				   struct hdmi_codec_params *params)
{
	struct zx_hdmi *hdmi = dev_get_drvdata(dev);
	struct hdmi_audio_infoframe *cea = &params->cea;
	union hdmi_infoframe frame;
	int n;

	/* We only support spdif for now */
	if (daifmt->fmt != HDMI_SPDIF) {
		DRM_DEV_ERROR(hdmi->dev, "invalid daifmt %d\n", daifmt->fmt);
		return -EINVAL;
	}

	switch (params->sample_width) {
	case 16:
		hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, SPDIF_SAMPLE_SIZE_MASK,
				 SPDIF_SAMPLE_SIZE_16BIT);
		break;
	case 20:
		hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, SPDIF_SAMPLE_SIZE_MASK,
				 SPDIF_SAMPLE_SIZE_20BIT);
		break;
	case 24:
		hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, SPDIF_SAMPLE_SIZE_MASK,
				 SPDIF_SAMPLE_SIZE_24BIT);
		break;
	default:
		DRM_DEV_ERROR(hdmi->dev, "invalid sample width %d\n",
			      params->sample_width);
		return -EINVAL;
	}

	/* CTS is calculated by hardware, and we only need to take care of N */
	n = zx_hdmi_audio_get_n(params->sample_rate);
	hdmi_writeb(hdmi, N_SVAL1, n & 0xff);
	hdmi_writeb(hdmi, N_SVAL2, (n >> 8) & 0xff);
	hdmi_writeb(hdmi, N_SVAL3, (n >> 16) & 0xf);

	/* Enable spdif mode */
	hdmi_writeb_mask(hdmi, AUD_MODE, SPDIF_EN, SPDIF_EN);

	/* Enable audio input */
	hdmi_writeb_mask(hdmi, AUD_EN, AUD_IN_EN, AUD_IN_EN);

	memcpy(&frame.audio, cea, sizeof(*cea));

	return zx_hdmi_infoframe_trans(hdmi, &frame, FSEL_AUDIO);
}

static int zx_hdmi_audio_digital_mute(struct device *dev, void *data,
				      bool enable)
{
	struct zx_hdmi *hdmi = dev_get_drvdata(dev);

	if (enable)
		hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, TPI_AUD_MUTE,
				 TPI_AUD_MUTE);
	else
		hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, TPI_AUD_MUTE, 0);

	return 0;
}

static int zx_hdmi_audio_get_eld(struct device *dev, void *data,
				 uint8_t *buf, size_t len)
{
	struct zx_hdmi *hdmi = dev_get_drvdata(dev);
	struct drm_connector *connector = &hdmi->connector;

	memcpy(buf, connector->eld, min(sizeof(connector->eld), len));

	return 0;
}

static const struct hdmi_codec_ops zx_hdmi_codec_ops = {
	.audio_startup = zx_hdmi_audio_startup,
	.hw_params = zx_hdmi_audio_hw_params,
	.audio_shutdown = zx_hdmi_audio_shutdown,
	.digital_mute = zx_hdmi_audio_digital_mute,
	.get_eld = zx_hdmi_audio_get_eld,
};

static struct hdmi_codec_pdata zx_hdmi_codec_pdata = {
	.ops = &zx_hdmi_codec_ops,
	.spdif = 1,
};

static int zx_hdmi_audio_register(struct zx_hdmi *hdmi)
{
	struct platform_device *pdev;

	pdev = platform_device_register_data(hdmi->dev, HDMI_CODEC_DRV_NAME,
					     PLATFORM_DEVID_AUTO,
					     &zx_hdmi_codec_pdata,
					     sizeof(zx_hdmi_codec_pdata));
	if (IS_ERR(pdev))
		return PTR_ERR(pdev);

	hdmi->audio_pdev = pdev;

	return 0;
}

static int zx_hdmi_i2c_read(struct zx_hdmi *hdmi, struct i2c_msg *msg)
{
	int len = msg->len;
	u8 *buf = msg->buf;
	int retry = 0;
	int ret = 0;

	/* Bits [9:8] of bytes */
	hdmi_writeb(hdmi, ZX_DDC_DIN_CNT2, (len >> 8) & 0xff);
	/* Bits [7:0] of bytes */
	hdmi_writeb(hdmi, ZX_DDC_DIN_CNT1, len & 0xff);

	/* Clear FIFO */
	hdmi_writeb_mask(hdmi, ZX_DDC_CMD, DDC_CMD_MASK, DDC_CMD_CLEAR_FIFO);

	/* Kick off the read */
	hdmi_writeb_mask(hdmi, ZX_DDC_CMD, DDC_CMD_MASK,
			 DDC_CMD_SEQUENTIAL_READ);

	while (len > 0) {
		int cnt, i;

		/* FIFO needs some time to get ready */
		usleep_range(500, 1000);

		cnt = hdmi_readb(hdmi, ZX_DDC_DOUT_CNT) & DDC_DOUT_CNT_MASK;
		if (cnt == 0) {
			if (++retry > 5) {
				DRM_DEV_ERROR(hdmi->dev,
					      "DDC FIFO read timed out!");
				return -ETIMEDOUT;
			}
			continue;
		}

		for (i = 0; i < cnt; i++)
			*buf++ = hdmi_readb(hdmi, ZX_DDC_DATA);
		len -= cnt;
	}

	return ret;
}

static int zx_hdmi_i2c_write(struct zx_hdmi *hdmi, struct i2c_msg *msg)
{
	/*
	 * The DDC I2C adapter is only for reading EDID data, so we assume
	 * that the write to this adapter must be the EDID data offset.
	 */
	if ((msg->len != 1) ||
	    ((msg->addr != DDC_ADDR) && (msg->addr != DDC_SEGMENT_ADDR)))
		return -EINVAL;

	if (msg->addr == DDC_SEGMENT_ADDR)
		hdmi_writeb(hdmi, ZX_DDC_SEGM, msg->addr << 1);
	else if (msg->addr == DDC_ADDR)
		hdmi_writeb(hdmi, ZX_DDC_ADDR, msg->addr << 1);

	hdmi_writeb(hdmi, ZX_DDC_OFFSET, msg->buf[0]);

	return 0;
}

static int zx_hdmi_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
			    int num)
{
	struct zx_hdmi *hdmi = i2c_get_adapdata(adap);
	struct zx_hdmi_i2c *ddc = hdmi->ddc;
	int i, ret = 0;

	mutex_lock(&ddc->lock);

	/* Enable DDC master access */
	hdmi_writeb_mask(hdmi, TPI_DDC_MASTER_EN, HW_DDC_MASTER, HW_DDC_MASTER);

	for (i = 0; i < num; i++) {
		DRM_DEV_DEBUG(hdmi->dev,
			      "xfer: num: %d/%d, len: %d, flags: %#x\n",
			      i + 1, num, msgs[i].len, msgs[i].flags);

		if (msgs[i].flags & I2C_M_RD)
			ret = zx_hdmi_i2c_read(hdmi, &msgs[i]);
		else
			ret = zx_hdmi_i2c_write(hdmi, &msgs[i]);

		if (ret < 0)
			break;
	}

	if (!ret)
		ret = num;

	/* Disable DDC master access */
	hdmi_writeb_mask(hdmi, TPI_DDC_MASTER_EN, HW_DDC_MASTER, 0);

	mutex_unlock(&ddc->lock);

	return ret;
}

static u32 zx_hdmi_i2c_func(struct i2c_adapter *adapter)
{
	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
}

static const struct i2c_algorithm zx_hdmi_algorithm = {
	.master_xfer	= zx_hdmi_i2c_xfer,
	.functionality	= zx_hdmi_i2c_func,
};

static int zx_hdmi_ddc_register(struct zx_hdmi *hdmi)
{
	struct i2c_adapter *adap;
	struct zx_hdmi_i2c *ddc;
	int ret;

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

	hdmi->ddc = ddc;
	mutex_init(&ddc->lock);

	adap = &ddc->adap;
	adap->owner = THIS_MODULE;
	adap->class = I2C_CLASS_DDC;
	adap->dev.parent = hdmi->dev;
	adap->algo = &zx_hdmi_algorithm;
	snprintf(adap->name, sizeof(adap->name), "zx hdmi i2c");

	ret = i2c_add_adapter(adap);
	if (ret) {
		DRM_DEV_ERROR(hdmi->dev, "failed to add I2C adapter: %d\n",
			      ret);
		return ret;
	}

	i2c_set_adapdata(adap, hdmi);

	return 0;
}

static int zx_hdmi_bind(struct device *dev, struct device *master, void *data)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct drm_device *drm = data;
	struct resource *res;
	struct zx_hdmi *hdmi;
	int irq;
	int ret;

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

	hdmi->dev = dev;
	hdmi->drm = drm;

	dev_set_drvdata(dev, hdmi);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	hdmi->mmio = devm_ioremap_resource(dev, res);
	if (IS_ERR(hdmi->mmio)) {
		ret = PTR_ERR(hdmi->mmio);
		DRM_DEV_ERROR(dev, "failed to remap hdmi region: %d\n", ret);
		return ret;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
		return irq;

	hdmi->cec_clk = devm_clk_get(hdmi->dev, "osc_cec");
	if (IS_ERR(hdmi->cec_clk)) {
		ret = PTR_ERR(hdmi->cec_clk);
		DRM_DEV_ERROR(dev, "failed to get cec_clk: %d\n", ret);
		return ret;
	}

	hdmi->osc_clk = devm_clk_get(hdmi->dev, "osc_clk");
	if (IS_ERR(hdmi->osc_clk)) {
		ret = PTR_ERR(hdmi->osc_clk);
		DRM_DEV_ERROR(dev, "failed to get osc_clk: %d\n", ret);
		return ret;
	}

	hdmi->xclk = devm_clk_get(hdmi->dev, "xclk");
	if (IS_ERR(hdmi->xclk)) {
		ret = PTR_ERR(hdmi->xclk);
		DRM_DEV_ERROR(dev, "failed to get xclk: %d\n", ret);
		return ret;
	}

	ret = zx_hdmi_ddc_register(hdmi);
	if (ret) {
		DRM_DEV_ERROR(dev, "failed to register ddc: %d\n", ret);
		return ret;
	}

	ret = zx_hdmi_audio_register(hdmi);
	if (ret) {
		DRM_DEV_ERROR(dev, "failed to register audio: %d\n", ret);
		return ret;
	}

	ret = zx_hdmi_register(drm, hdmi);
	if (ret) {
		DRM_DEV_ERROR(dev, "failed to register hdmi: %d\n", ret);
		return ret;
	}

	ret = devm_request_threaded_irq(dev, irq, zx_hdmi_irq_handler,
					zx_hdmi_irq_thread, IRQF_SHARED,
					dev_name(dev), hdmi);
	if (ret) {
		DRM_DEV_ERROR(dev, "failed to request threaded irq: %d\n", ret);
		return ret;
	}

	return 0;
}

static void zx_hdmi_unbind(struct device *dev, struct device *master,
			   void *data)
{
	struct zx_hdmi *hdmi = dev_get_drvdata(dev);

	hdmi->connector.funcs->destroy(&hdmi->connector);
	hdmi->encoder.funcs->destroy(&hdmi->encoder);

	if (hdmi->audio_pdev)
		platform_device_unregister(hdmi->audio_pdev);
}

static const struct component_ops zx_hdmi_component_ops = {
	.bind = zx_hdmi_bind,
	.unbind = zx_hdmi_unbind,
};

static int zx_hdmi_probe(struct platform_device *pdev)
{
	return component_add(&pdev->dev, &zx_hdmi_component_ops);
}

static int zx_hdmi_remove(struct platform_device *pdev)
{
	component_del(&pdev->dev, &zx_hdmi_component_ops);
	return 0;
}

static const struct of_device_id zx_hdmi_of_match[] = {
	{ .compatible = "zte,zx296718-hdmi", },
	{ /* end */ },
};
MODULE_DEVICE_TABLE(of, zx_hdmi_of_match);

struct platform_driver zx_hdmi_driver = {
	.probe = zx_hdmi_probe,
	.remove = zx_hdmi_remove,
	.driver	= {
		.name = "zx-hdmi",
		.of_match_table	= zx_hdmi_of_match,
	},
};