summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
blob: 9af39ec958db5eade1a8bdb786381753b6fd7d3b (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
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright(c) 2016, Analogix Semiconductor.
 * Copyright(c) 2017, Icenowy Zheng <icenowy@aosc.io>
 *
 * Based on anx7808 driver obtained from chromeos with copyright:
 * Copyright(c) 2013, Google Inc.
 */
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/types.h>

#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_dp_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>

#include "analogix-i2c-dptx.h"
#include "analogix-i2c-txcommon.h"

#define POLL_DELAY		50000 /* us */
#define POLL_TIMEOUT		5000000 /* us */

#define I2C_IDX_DPTX		0
#define I2C_IDX_TXCOM		1

static const u8 anx6345_i2c_addresses[] = {
	[I2C_IDX_DPTX]	= 0x70,
	[I2C_IDX_TXCOM]	= 0x72,
};
#define I2C_NUM_ADDRESSES	ARRAY_SIZE(anx6345_i2c_addresses)

struct anx6345 {
	struct drm_dp_aux aux;
	struct drm_bridge bridge;
	struct i2c_client *client;
	struct edid *edid;
	struct drm_connector connector;
	struct drm_panel *panel;
	struct regulator *dvdd12;
	struct regulator *dvdd25;
	struct gpio_desc *gpiod_reset;
	struct mutex lock;	/* protect EDID access */

	/* I2C Slave addresses of ANX6345 are mapped as DPTX and SYS */
	struct i2c_client *i2c_clients[I2C_NUM_ADDRESSES];
	struct regmap *map[I2C_NUM_ADDRESSES];

	u16 chipid;
	u8 dpcd[DP_RECEIVER_CAP_SIZE];

	bool powered;
};

static inline struct anx6345 *connector_to_anx6345(struct drm_connector *c)
{
	return container_of(c, struct anx6345, connector);
}

static inline struct anx6345 *bridge_to_anx6345(struct drm_bridge *bridge)
{
	return container_of(bridge, struct anx6345, bridge);
}

static int anx6345_set_bits(struct regmap *map, u8 reg, u8 mask)
{
	return regmap_update_bits(map, reg, mask, mask);
}

static int anx6345_clear_bits(struct regmap *map, u8 reg, u8 mask)
{
	return regmap_update_bits(map, reg, mask, 0);
}

static ssize_t anx6345_aux_transfer(struct drm_dp_aux *aux,
				    struct drm_dp_aux_msg *msg)
{
	struct anx6345 *anx6345 = container_of(aux, struct anx6345, aux);

	return anx_dp_aux_transfer(anx6345->map[I2C_IDX_DPTX], msg);
}

static int anx6345_dp_link_training(struct anx6345 *anx6345)
{
	unsigned int value;
	u8 dp_bw, dpcd[2];
	int err;

	err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
				 SP_POWERDOWN_CTRL_REG,
				 SP_TOTAL_PD);
	if (err)
		return err;

	err = drm_dp_dpcd_readb(&anx6345->aux, DP_MAX_LINK_RATE, &dp_bw);
	if (err < 0)
		return err;

	switch (dp_bw) {
	case DP_LINK_BW_1_62:
	case DP_LINK_BW_2_7:
		break;

	default:
		DRM_DEBUG_KMS("DP bandwidth (%#02x) not supported\n", dp_bw);
		return -EINVAL;
	}

	err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG,
			       SP_VIDEO_MUTE);
	if (err)
		return err;

	err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
				 SP_VID_CTRL1_REG, SP_VIDEO_EN);
	if (err)
		return err;

	/* Get DPCD info */
	err = drm_dp_dpcd_read(&anx6345->aux, DP_DPCD_REV,
			       &anx6345->dpcd, DP_RECEIVER_CAP_SIZE);
	if (err < 0) {
		DRM_ERROR("Failed to read DPCD: %d\n", err);
		return err;
	}

	/* Clear channel x SERDES power down */
	err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX],
				 SP_DP_ANALOG_POWER_DOWN_REG, SP_CH0_PD);
	if (err)
		return err;

	/*
	 * Power up the sink (DP_SET_POWER register is only available on DPCD
	 * v1.1 and later).
	 */
	if (anx6345->dpcd[DP_DPCD_REV] >= 0x11) {
		err = drm_dp_dpcd_readb(&anx6345->aux, DP_SET_POWER, &dpcd[0]);
		if (err < 0) {
			DRM_ERROR("Failed to read DP_SET_POWER register: %d\n",
				  err);
			return err;
		}

		dpcd[0] &= ~DP_SET_POWER_MASK;
		dpcd[0] |= DP_SET_POWER_D0;

		err = drm_dp_dpcd_writeb(&anx6345->aux, DP_SET_POWER, dpcd[0]);
		if (err < 0) {
			DRM_ERROR("Failed to power up DisplayPort link: %d\n",
				  err);
			return err;
		}

		/*
		 * According to the DP 1.1 specification, a "Sink Device must
		 * exit the power saving state within 1 ms" (Section 2.5.3.1,
		 * Table 5-52, "Sink Control Field" (register 0x600).
		 */
		usleep_range(1000, 2000);
	}

	/* Possibly enable downspread on the sink */
	err = regmap_write(anx6345->map[I2C_IDX_DPTX],
			   SP_DP_DOWNSPREAD_CTRL1_REG, 0);
	if (err)
		return err;

	if (anx6345->dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5) {
		DRM_DEBUG("Enable downspread on the sink\n");
		/* 4000PPM */
		err = regmap_write(anx6345->map[I2C_IDX_DPTX],
				   SP_DP_DOWNSPREAD_CTRL1_REG, 8);
		if (err)
			return err;

		err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL,
					 DP_SPREAD_AMP_0_5);
		if (err < 0)
			return err;
	} else {
		err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL, 0);
		if (err < 0)
			return err;
	}

	/* Set the lane count and the link rate on the sink */
	if (drm_dp_enhanced_frame_cap(anx6345->dpcd))
		err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
				       SP_DP_SYSTEM_CTRL_BASE + 4,
				       SP_ENHANCED_MODE);
	else
		err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX],
					 SP_DP_SYSTEM_CTRL_BASE + 4,
					 SP_ENHANCED_MODE);
	if (err)
		return err;

	dpcd[0] = dp_bw;
	err = regmap_write(anx6345->map[I2C_IDX_DPTX],
			   SP_DP_MAIN_LINK_BW_SET_REG, dpcd[0]);
	if (err)
		return err;

	dpcd[1] = drm_dp_max_lane_count(anx6345->dpcd);

	err = regmap_write(anx6345->map[I2C_IDX_DPTX],
			   SP_DP_LANE_COUNT_SET_REG, dpcd[1]);
	if (err)
		return err;

	if (drm_dp_enhanced_frame_cap(anx6345->dpcd))
		dpcd[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;

	err = drm_dp_dpcd_write(&anx6345->aux, DP_LINK_BW_SET, dpcd,
				sizeof(dpcd));

	if (err < 0) {
		DRM_ERROR("Failed to configure link: %d\n", err);
		return err;
	}

	/* Start training on the source */
	err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_LT_CTRL_REG,
			   SP_LT_EN);
	if (err)
		return err;

	return regmap_read_poll_timeout(anx6345->map[I2C_IDX_DPTX],
				       SP_DP_LT_CTRL_REG,
				       value, !(value & SP_DP_LT_INPROGRESS),
				       POLL_DELAY, POLL_TIMEOUT);
}

static int anx6345_tx_initialization(struct anx6345 *anx6345)
{
	int err, i;

	/* FIXME: colordepth is hardcoded for now */
	err = regmap_write(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL2_REG,
			   SP_IN_BPC_6BIT << SP_IN_BPC_SHIFT);
	if (err)
		return err;

	err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_PLL_CTRL_REG, 0);
	if (err)
		return err;

	err = regmap_write(anx6345->map[I2C_IDX_TXCOM],
			   SP_ANALOG_DEBUG1_REG, 0);
	if (err)
		return err;

	err = regmap_write(anx6345->map[I2C_IDX_DPTX],
			   SP_DP_LINK_DEBUG_CTRL_REG,
			   SP_NEW_PRBS7 | SP_M_VID_DEBUG);
	if (err)
		return err;

	err = regmap_write(anx6345->map[I2C_IDX_DPTX],
			   SP_DP_ANALOG_POWER_DOWN_REG, 0);
	if (err)
		return err;

	/* Force HPD */
	err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
			       SP_DP_SYSTEM_CTRL_BASE + 3,
			       SP_HPD_FORCE | SP_HPD_CTRL);
	if (err)
		return err;

	for (i = 0; i < 4; i++) {
		/* 4 lanes */
		err = regmap_write(anx6345->map[I2C_IDX_DPTX],
				   SP_DP_LANE0_LT_CTRL_REG + i, 0);
		if (err)
			return err;
	}

	/* Reset AUX */
	err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM],
			       SP_RESET_CTRL2_REG, SP_AUX_RST);
	if (err)
		return err;

	return anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
				 SP_RESET_CTRL2_REG, SP_AUX_RST);
}

static void anx6345_poweron(struct anx6345 *anx6345)
{
	int err;

	/* Ensure reset is asserted before starting power on sequence */
	gpiod_set_value_cansleep(anx6345->gpiod_reset, 1);
	usleep_range(1000, 2000);

	err = regulator_enable(anx6345->dvdd12);
	if (err) {
		DRM_ERROR("Failed to enable dvdd12 regulator: %d\n",
			  err);
		return;
	}

	/* T1 - delay between VDD12 and VDD25 should be 0-2ms */
	usleep_range(1000, 2000);

	err = regulator_enable(anx6345->dvdd25);
	if (err) {
		DRM_ERROR("Failed to enable dvdd25 regulator: %d\n",
			  err);
		return;
	}

	/* T2 - delay between RESETN and all power rail stable,
	 * should be 2-5ms
	 */
	usleep_range(2000, 5000);

	gpiod_set_value_cansleep(anx6345->gpiod_reset, 0);

	/* Power on registers module */
	anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
			 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
	anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
			   SP_REGISTER_PD | SP_TOTAL_PD);

	if (anx6345->panel)
		drm_panel_prepare(anx6345->panel);

	anx6345->powered = true;
}

static void anx6345_poweroff(struct anx6345 *anx6345)
{
	int err;

	gpiod_set_value_cansleep(anx6345->gpiod_reset, 1);
	usleep_range(1000, 2000);

	if (anx6345->panel)
		drm_panel_unprepare(anx6345->panel);

	err = regulator_disable(anx6345->dvdd25);
	if (err) {
		DRM_ERROR("Failed to disable dvdd25 regulator: %d\n",
			  err);
		return;
	}

	usleep_range(5000, 10000);

	err = regulator_disable(anx6345->dvdd12);
	if (err) {
		DRM_ERROR("Failed to disable dvdd12 regulator: %d\n",
			  err);
		return;
	}

	usleep_range(1000, 2000);

	anx6345->powered = false;
}

static int anx6345_start(struct anx6345 *anx6345)
{
	int err;

	if (!anx6345->powered)
		anx6345_poweron(anx6345);

	/* Power on needed modules */
	err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
				SP_POWERDOWN_CTRL_REG,
				SP_VIDEO_PD | SP_LINK_PD);

	err = anx6345_tx_initialization(anx6345);
	if (err) {
		DRM_ERROR("Failed eDP transmitter initialization: %d\n", err);
		anx6345_poweroff(anx6345);
		return err;
	}

	err = anx6345_dp_link_training(anx6345);
	if (err) {
		DRM_ERROR("Failed link training: %d\n", err);
		anx6345_poweroff(anx6345);
		return err;
	}

	/*
	 * This delay seems to help keep the hardware in a good state. Without
	 * it, there are times where it fails silently.
	 */
	usleep_range(10000, 15000);

	return 0;
}

static int anx6345_config_dp_output(struct anx6345 *anx6345)
{
	int err;

	err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG,
				 SP_VIDEO_MUTE);
	if (err)
		return err;

	/* Enable DP output */
	err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG,
			       SP_VIDEO_EN);
	if (err)
		return err;

	/* Force stream valid */
	return anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
			       SP_DP_SYSTEM_CTRL_BASE + 3,
			       SP_STRM_FORCE | SP_STRM_CTRL);
}

static int anx6345_get_downstream_info(struct anx6345 *anx6345)
{
	u8 value;
	int err;

	err = drm_dp_dpcd_readb(&anx6345->aux, DP_SINK_COUNT, &value);
	if (err < 0) {
		DRM_ERROR("Get sink count failed %d\n", err);
		return err;
	}

	if (!DP_GET_SINK_COUNT(value)) {
		DRM_ERROR("Downstream disconnected\n");
		return -EIO;
	}

	return 0;
}

static int anx6345_get_modes(struct drm_connector *connector)
{
	struct anx6345 *anx6345 = connector_to_anx6345(connector);
	int err, num_modes = 0;
	bool power_off = false;

	mutex_lock(&anx6345->lock);

	if (!anx6345->edid) {
		if (!anx6345->powered) {
			anx6345_poweron(anx6345);
			power_off = true;
		}

		err = anx6345_get_downstream_info(anx6345);
		if (err) {
			DRM_ERROR("Failed to get downstream info: %d\n", err);
			goto unlock;
		}

		anx6345->edid = drm_get_edid(connector, &anx6345->aux.ddc);
		if (!anx6345->edid)
			DRM_ERROR("Failed to read EDID from panel\n");

		err = drm_connector_update_edid_property(connector,
							 anx6345->edid);
		if (err) {
			DRM_ERROR("Failed to update EDID property: %d\n", err);
			goto unlock;
		}
	}

	num_modes += drm_add_edid_modes(connector, anx6345->edid);

	/* Driver currently supports only 6bpc */
	connector->display_info.bpc = 6;

unlock:
	if (power_off)
		anx6345_poweroff(anx6345);

	mutex_unlock(&anx6345->lock);

	if (!num_modes && anx6345->panel)
		num_modes += drm_panel_get_modes(anx6345->panel, connector);

	return num_modes;
}

static const struct drm_connector_helper_funcs anx6345_connector_helper_funcs = {
	.get_modes = anx6345_get_modes,
};

static void
anx6345_connector_destroy(struct drm_connector *connector)
{
	struct anx6345 *anx6345 = connector_to_anx6345(connector);

	if (anx6345->panel)
		drm_panel_detach(anx6345->panel);
	drm_connector_cleanup(connector);
}

static const struct drm_connector_funcs anx6345_connector_funcs = {
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = anx6345_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 int anx6345_bridge_attach(struct drm_bridge *bridge,
				 enum drm_bridge_attach_flags flags)
{
	struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
	int err;

	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
		DRM_ERROR("Fix bridge driver to make connector optional!");
		return -EINVAL;
	}

	if (!bridge->encoder) {
		DRM_ERROR("Parent encoder object not found");
		return -ENODEV;
	}

	/* Register aux channel */
	anx6345->aux.name = "DP-AUX";
	anx6345->aux.dev = &anx6345->client->dev;
	anx6345->aux.transfer = anx6345_aux_transfer;

	err = drm_dp_aux_register(&anx6345->aux);
	if (err < 0) {
		DRM_ERROR("Failed to register aux channel: %d\n", err);
		return err;
	}

	err = drm_connector_init(bridge->dev, &anx6345->connector,
				 &anx6345_connector_funcs,
				 DRM_MODE_CONNECTOR_eDP);
	if (err) {
		DRM_ERROR("Failed to initialize connector: %d\n", err);
		return err;
	}

	drm_connector_helper_add(&anx6345->connector,
				 &anx6345_connector_helper_funcs);

	err = drm_connector_register(&anx6345->connector);
	if (err) {
		DRM_ERROR("Failed to register connector: %d\n", err);
		return err;
	}

	anx6345->connector.polled = DRM_CONNECTOR_POLL_HPD;

	err = drm_connector_attach_encoder(&anx6345->connector,
					   bridge->encoder);
	if (err) {
		DRM_ERROR("Failed to link up connector to encoder: %d\n", err);
		return err;
	}

	if (anx6345->panel) {
		err = drm_panel_attach(anx6345->panel, &anx6345->connector);
		if (err) {
			DRM_ERROR("Failed to attach panel: %d\n", err);
			return err;
		}
	}

	return 0;
}

static enum drm_mode_status
anx6345_bridge_mode_valid(struct drm_bridge *bridge,
			  const struct drm_display_mode *mode)
{
	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
		return MODE_NO_INTERLACE;

	/* Max 1200p at 5.4 Ghz, one lane */
	if (mode->clock > 154000)
		return MODE_CLOCK_HIGH;

	return MODE_OK;
}

static void anx6345_bridge_disable(struct drm_bridge *bridge)
{
	struct anx6345 *anx6345 = bridge_to_anx6345(bridge);

	/* Power off all modules except configuration registers access */
	anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
			 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
	if (anx6345->panel)
		drm_panel_disable(anx6345->panel);

	if (anx6345->powered)
		anx6345_poweroff(anx6345);
}

static void anx6345_bridge_enable(struct drm_bridge *bridge)
{
	struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
	int err;

	if (anx6345->panel)
		drm_panel_enable(anx6345->panel);

	err = anx6345_start(anx6345);
	if (err) {
		DRM_ERROR("Failed to initialize: %d\n", err);
		return;
	}

	err = anx6345_config_dp_output(anx6345);
	if (err)
		DRM_ERROR("Failed to enable DP output: %d\n", err);
}

static const struct drm_bridge_funcs anx6345_bridge_funcs = {
	.attach = anx6345_bridge_attach,
	.mode_valid = anx6345_bridge_mode_valid,
	.disable = anx6345_bridge_disable,
	.enable = anx6345_bridge_enable,
};

static void unregister_i2c_dummy_clients(struct anx6345 *anx6345)
{
	unsigned int i;

	for (i = 1; i < ARRAY_SIZE(anx6345->i2c_clients); i++)
		if (anx6345->i2c_clients[i] &&
		    anx6345->i2c_clients[i]->addr != anx6345->client->addr)
			i2c_unregister_device(anx6345->i2c_clients[i]);
}

static const struct regmap_config anx6345_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = 0xff,
	.cache_type = REGCACHE_NONE,
};

static const u16 anx6345_chipid_list[] = {
	0x6345,
};

static bool anx6345_get_chip_id(struct anx6345 *anx6345)
{
	unsigned int i, idl, idh, version;

	if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDL_REG, &idl))
		return false;

	if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDH_REG, &idh))
		return false;

	anx6345->chipid = (u8)idl | ((u8)idh << 8);

	if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_VERSION_REG,
			&version))
		return false;

	for (i = 0; i < ARRAY_SIZE(anx6345_chipid_list); i++) {
		if (anx6345->chipid == anx6345_chipid_list[i]) {
			DRM_INFO("Found ANX%x (ver. %d) eDP Transmitter\n",
				 anx6345->chipid, version);
			return true;
		}
	}

	DRM_ERROR("ANX%x (ver. %d) not supported by this driver\n",
		  anx6345->chipid, version);

	return false;
}

static int anx6345_i2c_probe(struct i2c_client *client,
			     const struct i2c_device_id *id)
{
	struct anx6345 *anx6345;
	struct device *dev;
	int i, err;

	anx6345 = devm_kzalloc(&client->dev, sizeof(*anx6345), GFP_KERNEL);
	if (!anx6345)
		return -ENOMEM;

	mutex_init(&anx6345->lock);

	anx6345->bridge.of_node = client->dev.of_node;

	anx6345->client = client;
	i2c_set_clientdata(client, anx6345);

	dev = &anx6345->client->dev;

	err = drm_of_find_panel_or_bridge(client->dev.of_node, 1, 0,
					  &anx6345->panel, NULL);
	if (err == -EPROBE_DEFER)
		return err;

	if (err)
		DRM_DEBUG("No panel found\n");

	/* 1.2V digital core power regulator  */
	anx6345->dvdd12 = devm_regulator_get(dev, "dvdd12");
	if (IS_ERR(anx6345->dvdd12)) {
		if (PTR_ERR(anx6345->dvdd12) != -EPROBE_DEFER)
			DRM_ERROR("Failed to get dvdd12 supply (%ld)\n",
				  PTR_ERR(anx6345->dvdd12));
		return PTR_ERR(anx6345->dvdd12);
	}

	/* 2.5V digital core power regulator  */
	anx6345->dvdd25 = devm_regulator_get(dev, "dvdd25");
	if (IS_ERR(anx6345->dvdd25)) {
		if (PTR_ERR(anx6345->dvdd25) != -EPROBE_DEFER)
			DRM_ERROR("Failed to get dvdd25 supply (%ld)\n",
				  PTR_ERR(anx6345->dvdd25));
		return PTR_ERR(anx6345->dvdd25);
	}

	/* GPIO for chip reset */
	anx6345->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
	if (IS_ERR(anx6345->gpiod_reset)) {
		DRM_ERROR("Reset gpio not found\n");
		return PTR_ERR(anx6345->gpiod_reset);
	}

	/* Map slave addresses of ANX6345 */
	for (i = 0; i < I2C_NUM_ADDRESSES; i++) {
		if (anx6345_i2c_addresses[i] >> 1 != client->addr)
			anx6345->i2c_clients[i] = i2c_new_dummy_device(client->adapter,
						anx6345_i2c_addresses[i] >> 1);
		else
			anx6345->i2c_clients[i] = client;

		if (IS_ERR(anx6345->i2c_clients[i])) {
			err = PTR_ERR(anx6345->i2c_clients[i]);
			DRM_ERROR("Failed to reserve I2C bus %02x\n",
				  anx6345_i2c_addresses[i]);
			goto err_unregister_i2c;
		}

		anx6345->map[i] = devm_regmap_init_i2c(anx6345->i2c_clients[i],
						       &anx6345_regmap_config);
		if (IS_ERR(anx6345->map[i])) {
			err = PTR_ERR(anx6345->map[i]);
			DRM_ERROR("Failed regmap initialization %02x\n",
				  anx6345_i2c_addresses[i]);
			goto err_unregister_i2c;
		}
	}

	/* Look for supported chip ID */
	anx6345_poweron(anx6345);
	if (anx6345_get_chip_id(anx6345)) {
		anx6345->bridge.funcs = &anx6345_bridge_funcs;
		drm_bridge_add(&anx6345->bridge);

		return 0;
	} else {
		anx6345_poweroff(anx6345);
		err = -ENODEV;
	}

err_unregister_i2c:
	unregister_i2c_dummy_clients(anx6345);
	return err;
}

static int anx6345_i2c_remove(struct i2c_client *client)
{
	struct anx6345 *anx6345 = i2c_get_clientdata(client);

	drm_bridge_remove(&anx6345->bridge);

	unregister_i2c_dummy_clients(anx6345);

	kfree(anx6345->edid);

	mutex_destroy(&anx6345->lock);

	return 0;
}

static const struct i2c_device_id anx6345_id[] = {
	{ "anx6345", 0 },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(i2c, anx6345_id);

static const struct of_device_id anx6345_match_table[] = {
	{ .compatible = "analogix,anx6345", },
	{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, anx6345_match_table);

static struct i2c_driver anx6345_driver = {
	.driver = {
		   .name = "anx6345",
		   .of_match_table = of_match_ptr(anx6345_match_table),
		  },
	.probe = anx6345_i2c_probe,
	.remove = anx6345_i2c_remove,
	.id_table = anx6345_id,
};
module_i2c_driver(anx6345_driver);

MODULE_DESCRIPTION("ANX6345 eDP Transmitter driver");
MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");
MODULE_LICENSE("GPL v2");