analogix-anx6345.c

  1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 * Copyright(c) 2016, Analogix Semiconductor.
  4 * Copyright(c) 2017, Icenowy Zheng <icenowy@aosc.io>
  5 *
  6 * Based on anx7808 driver obtained from chromeos with copyright:
  7 * Copyright(c) 2013, Google Inc.
  8 */
  9#include <linux/delay.h>
 10#include <linux/err.h>
 11#include <linux/gpio/consumer.h>
 12#include <linux/i2c.h>
 13#include <linux/interrupt.h>
 14#include <linux/kernel.h>
 15#include <linux/module.h>
 16#include <linux/of_platform.h>
 17#include <linux/regmap.h>
 18#include <linux/regulator/consumer.h>
 19#include <linux/types.h>
 20
 21#include <drm/display/drm_dp_helper.h>
 22#include <drm/drm_atomic_helper.h>
 23#include <drm/drm_bridge.h>
 24#include <drm/drm_crtc.h>
 25#include <drm/drm_edid.h>
 26#include <drm/drm_of.h>
 27#include <drm/drm_panel.h>
 28#include <drm/drm_print.h>
 29#include <drm/drm_probe_helper.h>
 30
 31#include "analogix-i2c-dptx.h"
 32#include "analogix-i2c-txcommon.h"
 33
 34#define POLL_DELAY		50000 /* us */
 35#define POLL_TIMEOUT		5000000 /* us */
 36
 37#define I2C_IDX_DPTX		0
 38#define I2C_IDX_TXCOM		1
 39
 40static const u8 anx6345_i2c_addresses[] = {
 41	[I2C_IDX_DPTX]	= 0x70,
 42	[I2C_IDX_TXCOM]	= 0x72,
 43};
 44#define I2C_NUM_ADDRESSES	ARRAY_SIZE(anx6345_i2c_addresses)
 45
 46struct anx6345 {
 47	struct drm_dp_aux aux;
 48	struct drm_bridge bridge;
 49	struct i2c_client *client;
 50	const struct drm_edid *drm_edid;
 51	struct drm_connector connector;
 52	struct drm_panel *panel;
 53	struct regulator *dvdd12;
 54	struct regulator *dvdd25;
 55	struct gpio_desc *gpiod_reset;
 56	struct mutex lock;	/* protect EDID access */
 57
 58	/* I2C Slave addresses of ANX6345 are mapped as DPTX and SYS */
 59	struct i2c_client *i2c_clients[I2C_NUM_ADDRESSES];
 60	struct regmap *map[I2C_NUM_ADDRESSES];
 61
 62	u16 chipid;
 63	u8 dpcd[DP_RECEIVER_CAP_SIZE];
 64
 65	bool powered;
 66};
 67
 68static inline struct anx6345 *connector_to_anx6345(struct drm_connector *c)
 69{
 70	return container_of(c, struct anx6345, connector);
 71}
 72
 73static inline struct anx6345 *bridge_to_anx6345(struct drm_bridge *bridge)
 74{
 75	return container_of(bridge, struct anx6345, bridge);
 76}
 77
 78static int anx6345_set_bits(struct regmap *map, u8 reg, u8 mask)
 79{
 80	return regmap_update_bits(map, reg, mask, mask);
 81}
 82
 83static int anx6345_clear_bits(struct regmap *map, u8 reg, u8 mask)
 84{
 85	return regmap_update_bits(map, reg, mask, 0);
 86}
 87
 88static ssize_t anx6345_aux_transfer(struct drm_dp_aux *aux,
 89				    struct drm_dp_aux_msg *msg)
 90{
 91	struct anx6345 *anx6345 = container_of(aux, struct anx6345, aux);
 92
 93	return anx_dp_aux_transfer(anx6345->map[I2C_IDX_DPTX], msg);
 94}
 95
 96static int anx6345_dp_link_training(struct anx6345 *anx6345)
 97{
 98	unsigned int value;
 99	u8 dp_bw, dpcd[2];
100	int err;
101
102	err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
103				 SP_POWERDOWN_CTRL_REG,
104				 SP_TOTAL_PD);
105	if (err)
106		return err;
107
108	err = drm_dp_dpcd_readb(&anx6345->aux, DP_MAX_LINK_RATE, &dp_bw);
109	if (err < 0)
110		return err;
111
112	switch (dp_bw) {
113	case DP_LINK_BW_1_62:
114	case DP_LINK_BW_2_7:
115		break;
116
117	default:
118		DRM_DEBUG_KMS("DP bandwidth (%#02x) not supported\n", dp_bw);
119		return -EINVAL;
120	}
121
122	err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG,
123			       SP_VIDEO_MUTE);
124	if (err)
125		return err;
126
127	err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
128				 SP_VID_CTRL1_REG, SP_VIDEO_EN);
129	if (err)
130		return err;
131
132	/* Get DPCD info */
133	err = drm_dp_dpcd_read(&anx6345->aux, DP_DPCD_REV,
134			       &anx6345->dpcd, DP_RECEIVER_CAP_SIZE);
135	if (err < 0) {
136		DRM_ERROR("Failed to read DPCD: %d\n", err);
137		return err;
138	}
139
140	/* Clear channel x SERDES power down */
141	err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX],
142				 SP_DP_ANALOG_POWER_DOWN_REG, SP_CH0_PD);
143	if (err)
144		return err;
145
146	drm_dp_link_power_up(&anx6345->aux, anx6345->dpcd[DP_DPCD_REV]);
147
148	/* Possibly enable downspread on the sink */
149	err = regmap_write(anx6345->map[I2C_IDX_DPTX],
150			   SP_DP_DOWNSPREAD_CTRL1_REG, 0);
151	if (err)
152		return err;
153
154	if (anx6345->dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5) {
155		DRM_DEBUG("Enable downspread on the sink\n");
156		/* 4000PPM */
157		err = regmap_write(anx6345->map[I2C_IDX_DPTX],
158				   SP_DP_DOWNSPREAD_CTRL1_REG, 8);
159		if (err)
160			return err;
161
162		err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL,
163					 DP_SPREAD_AMP_0_5);
164		if (err < 0)
165			return err;
166	} else {
167		err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL, 0);
168		if (err < 0)
169			return err;
170	}
171
172	/* Set the lane count and the link rate on the sink */
173	if (drm_dp_enhanced_frame_cap(anx6345->dpcd))
174		err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
175				       SP_DP_SYSTEM_CTRL_BASE + 4,
176				       SP_ENHANCED_MODE);
177	else
178		err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX],
179					 SP_DP_SYSTEM_CTRL_BASE + 4,
180					 SP_ENHANCED_MODE);
181	if (err)
182		return err;
183
184	dpcd[0] = dp_bw;
185	err = regmap_write(anx6345->map[I2C_IDX_DPTX],
186			   SP_DP_MAIN_LINK_BW_SET_REG, dpcd[0]);
187	if (err)
188		return err;
189
190	dpcd[1] = drm_dp_max_lane_count(anx6345->dpcd);
191
192	err = regmap_write(anx6345->map[I2C_IDX_DPTX],
193			   SP_DP_LANE_COUNT_SET_REG, dpcd[1]);
194	if (err)
195		return err;
196
197	if (drm_dp_enhanced_frame_cap(anx6345->dpcd))
198		dpcd[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
199
200	err = drm_dp_dpcd_write(&anx6345->aux, DP_LINK_BW_SET, dpcd,
201				sizeof(dpcd));
202
203	if (err < 0) {
204		DRM_ERROR("Failed to configure link: %d\n", err);
205		return err;
206	}
207
208	/* Start training on the source */
209	err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_LT_CTRL_REG,
210			   SP_LT_EN);
211	if (err)
212		return err;
213
214	return regmap_read_poll_timeout(anx6345->map[I2C_IDX_DPTX],
215				       SP_DP_LT_CTRL_REG,
216				       value, !(value & SP_DP_LT_INPROGRESS),
217				       POLL_DELAY, POLL_TIMEOUT);
218}
219
220static int anx6345_tx_initialization(struct anx6345 *anx6345)
221{
222	int err, i;
223
224	/* FIXME: colordepth is hardcoded for now */
225	err = regmap_write(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL2_REG,
226			   SP_IN_BPC_6BIT << SP_IN_BPC_SHIFT);
227	if (err)
228		return err;
229
230	err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_PLL_CTRL_REG, 0);
231	if (err)
232		return err;
233
234	err = regmap_write(anx6345->map[I2C_IDX_TXCOM],
235			   SP_ANALOG_DEBUG1_REG, 0);
236	if (err)
237		return err;
238
239	err = regmap_write(anx6345->map[I2C_IDX_DPTX],
240			   SP_DP_LINK_DEBUG_CTRL_REG,
241			   SP_NEW_PRBS7 | SP_M_VID_DEBUG);
242	if (err)
243		return err;
244
245	err = regmap_write(anx6345->map[I2C_IDX_DPTX],
246			   SP_DP_ANALOG_POWER_DOWN_REG, 0);
247	if (err)
248		return err;
249
250	/* Force HPD */
251	err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
252			       SP_DP_SYSTEM_CTRL_BASE + 3,
253			       SP_HPD_FORCE | SP_HPD_CTRL);
254	if (err)
255		return err;
256
257	for (i = 0; i < 4; i++) {
258		/* 4 lanes */
259		err = regmap_write(anx6345->map[I2C_IDX_DPTX],
260				   SP_DP_LANE0_LT_CTRL_REG + i, 0);
261		if (err)
262			return err;
263	}
264
265	/* Reset AUX */
266	err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM],
267			       SP_RESET_CTRL2_REG, SP_AUX_RST);
268	if (err)
269		return err;
270
271	return anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
272				 SP_RESET_CTRL2_REG, SP_AUX_RST);
273}
274
275static void anx6345_poweron(struct anx6345 *anx6345)
276{
277	int err;
278
279	/* Ensure reset is asserted before starting power on sequence */
280	gpiod_set_value_cansleep(anx6345->gpiod_reset, 1);
281	usleep_range(1000, 2000);
282
283	err = regulator_enable(anx6345->dvdd12);
284	if (err) {
285		DRM_ERROR("Failed to enable dvdd12 regulator: %d\n",
286			  err);
287		return;
288	}
289
290	/* T1 - delay between VDD12 and VDD25 should be 0-2ms */
291	usleep_range(1000, 2000);
292
293	err = regulator_enable(anx6345->dvdd25);
294	if (err) {
295		DRM_ERROR("Failed to enable dvdd25 regulator: %d\n",
296			  err);
297		return;
298	}
299
300	/* T2 - delay between RESETN and all power rail stable,
301	 * should be 2-5ms
302	 */
303	usleep_range(2000, 5000);
304
305	gpiod_set_value_cansleep(anx6345->gpiod_reset, 0);
306
307	/* Power on registers module */
308	anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
309			 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
310	anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
311			   SP_REGISTER_PD | SP_TOTAL_PD);
312
313	if (anx6345->panel)
314		drm_panel_prepare(anx6345->panel);
315
316	anx6345->powered = true;
317}
318
319static void anx6345_poweroff(struct anx6345 *anx6345)
320{
321	int err;
322
323	gpiod_set_value_cansleep(anx6345->gpiod_reset, 1);
324	usleep_range(1000, 2000);
325
326	if (anx6345->panel)
327		drm_panel_unprepare(anx6345->panel);
328
329	err = regulator_disable(anx6345->dvdd25);
330	if (err) {
331		DRM_ERROR("Failed to disable dvdd25 regulator: %d\n",
332			  err);
333		return;
334	}
335
336	usleep_range(5000, 10000);
337
338	err = regulator_disable(anx6345->dvdd12);
339	if (err) {
340		DRM_ERROR("Failed to disable dvdd12 regulator: %d\n",
341			  err);
342		return;
343	}
344
345	usleep_range(1000, 2000);
346
347	anx6345->powered = false;
348}
349
350static int anx6345_start(struct anx6345 *anx6345)
351{
352	int err;
353
354	if (!anx6345->powered)
355		anx6345_poweron(anx6345);
356
357	/* Power on needed modules */
358	err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
359				SP_POWERDOWN_CTRL_REG,
360				SP_VIDEO_PD | SP_LINK_PD);
361
362	err = anx6345_tx_initialization(anx6345);
363	if (err) {
364		DRM_ERROR("Failed eDP transmitter initialization: %d\n", err);
365		anx6345_poweroff(anx6345);
366		return err;
367	}
368
369	err = anx6345_dp_link_training(anx6345);
370	if (err) {
371		DRM_ERROR("Failed link training: %d\n", err);
372		anx6345_poweroff(anx6345);
373		return err;
374	}
375
376	/*
377	 * This delay seems to help keep the hardware in a good state. Without
378	 * it, there are times where it fails silently.
379	 */
380	usleep_range(10000, 15000);
381
382	return 0;
383}
384
385static int anx6345_config_dp_output(struct anx6345 *anx6345)
386{
387	int err;
388
389	err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG,
390				 SP_VIDEO_MUTE);
391	if (err)
392		return err;
393
394	/* Enable DP output */
395	err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG,
396			       SP_VIDEO_EN);
397	if (err)
398		return err;
399
400	/* Force stream valid */
401	return anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
402			       SP_DP_SYSTEM_CTRL_BASE + 3,
403			       SP_STRM_FORCE | SP_STRM_CTRL);
404}
405
406static int anx6345_get_downstream_info(struct anx6345 *anx6345)
407{
408	u8 value;
409	int err;
410
411	err = drm_dp_dpcd_readb(&anx6345->aux, DP_SINK_COUNT, &value);
412	if (err < 0) {
413		DRM_ERROR("Get sink count failed %d\n", err);
414		return err;
415	}
416
417	if (!DP_GET_SINK_COUNT(value)) {
418		DRM_ERROR("Downstream disconnected\n");
419		return -EIO;
420	}
421
422	return 0;
423}
424
425static int anx6345_get_modes(struct drm_connector *connector)
426{
427	struct anx6345 *anx6345 = connector_to_anx6345(connector);
428	int err, num_modes = 0;
429	bool power_off = false;
430
431	mutex_lock(&anx6345->lock);
432
433	if (!anx6345->drm_edid) {
434		if (!anx6345->powered) {
435			anx6345_poweron(anx6345);
436			power_off = true;
437		}
438
439		err = anx6345_get_downstream_info(anx6345);
440		if (err) {
441			DRM_ERROR("Failed to get downstream info: %d\n", err);
442			goto unlock;
443		}
444
445		anx6345->drm_edid = drm_edid_read_ddc(connector, &anx6345->aux.ddc);
446		if (!anx6345->drm_edid)
447			DRM_ERROR("Failed to read EDID from panel\n");
448
449		err = drm_edid_connector_update(connector, anx6345->drm_edid);
450		if (err) {
451			DRM_ERROR("Failed to update EDID property: %d\n", err);
452			goto unlock;
453		}
454	}
455
456	num_modes += drm_edid_connector_add_modes(connector);
457
458	/* Driver currently supports only 6bpc */
459	connector->display_info.bpc = 6;
460
461unlock:
462	if (power_off)
463		anx6345_poweroff(anx6345);
464
465	mutex_unlock(&anx6345->lock);
466
467	if (!num_modes && anx6345->panel)
468		num_modes += drm_panel_get_modes(anx6345->panel, connector);
469
470	return num_modes;
471}
472
473static const struct drm_connector_helper_funcs anx6345_connector_helper_funcs = {
474	.get_modes = anx6345_get_modes,
475};
476
477static void
478anx6345_connector_destroy(struct drm_connector *connector)
479{
480	drm_connector_cleanup(connector);
481}
482
483static const struct drm_connector_funcs anx6345_connector_funcs = {
484	.fill_modes = drm_helper_probe_single_connector_modes,
485	.destroy = anx6345_connector_destroy,
486	.reset = drm_atomic_helper_connector_reset,
487	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
488	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
489};
490
491static int anx6345_bridge_attach(struct drm_bridge *bridge,
492				 struct drm_encoder *encoder,
493				 enum drm_bridge_attach_flags flags)
494{
495	struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
496	int err;
497
498	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
499		DRM_ERROR("Fix bridge driver to make connector optional!");
500		return -EINVAL;
501	}
502
503	/* Register aux channel */
504	anx6345->aux.name = "DP-AUX";
505	anx6345->aux.dev = &anx6345->client->dev;
506	anx6345->aux.drm_dev = bridge->dev;
507	anx6345->aux.transfer = anx6345_aux_transfer;
508
509	err = drm_dp_aux_register(&anx6345->aux);
510	if (err < 0) {
511		DRM_ERROR("Failed to register aux channel: %d\n", err);
512		return err;
513	}
514
515	err = drm_connector_init(bridge->dev, &anx6345->connector,
516				 &anx6345_connector_funcs,
517				 DRM_MODE_CONNECTOR_eDP);
518	if (err) {
519		DRM_ERROR("Failed to initialize connector: %d\n", err);
520		goto aux_unregister;
521	}
522
523	drm_connector_helper_add(&anx6345->connector,
524				 &anx6345_connector_helper_funcs);
525
526	anx6345->connector.polled = DRM_CONNECTOR_POLL_HPD;
527
528	err = drm_connector_attach_encoder(&anx6345->connector,
529					   encoder);
530	if (err) {
531		DRM_ERROR("Failed to link up connector to encoder: %d\n", err);
532		goto connector_cleanup;
533	}
534
535	err = drm_connector_register(&anx6345->connector);
536	if (err) {
537		DRM_ERROR("Failed to register connector: %d\n", err);
538		goto connector_cleanup;
539	}
540
541	return 0;
542connector_cleanup:
543	drm_connector_cleanup(&anx6345->connector);
544aux_unregister:
545	drm_dp_aux_unregister(&anx6345->aux);
546	return err;
547}
548
549static void anx6345_bridge_detach(struct drm_bridge *bridge)
550{
551	drm_dp_aux_unregister(&bridge_to_anx6345(bridge)->aux);
552}
553
554static enum drm_mode_status
555anx6345_bridge_mode_valid(struct drm_bridge *bridge,
556			  const struct drm_display_info *info,
557			  const struct drm_display_mode *mode)
558{
559	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
560		return MODE_NO_INTERLACE;
561
562	/* Max 1200p at 5.4 Ghz, one lane */
563	if (mode->clock > 154000)
564		return MODE_CLOCK_HIGH;
565
566	return MODE_OK;
567}
568
569static void anx6345_bridge_disable(struct drm_bridge *bridge)
570{
571	struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
572
573	/* Power off all modules except configuration registers access */
574	anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
575			 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
576	if (anx6345->panel)
577		drm_panel_disable(anx6345->panel);
578
579	if (anx6345->powered)
580		anx6345_poweroff(anx6345);
581}
582
583static void anx6345_bridge_enable(struct drm_bridge *bridge)
584{
585	struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
586	int err;
587
588	if (anx6345->panel)
589		drm_panel_enable(anx6345->panel);
590
591	err = anx6345_start(anx6345);
592	if (err) {
593		DRM_ERROR("Failed to initialize: %d\n", err);
594		return;
595	}
596
597	err = anx6345_config_dp_output(anx6345);
598	if (err)
599		DRM_ERROR("Failed to enable DP output: %d\n", err);
600}
601
602static const struct drm_bridge_funcs anx6345_bridge_funcs = {
603	.attach = anx6345_bridge_attach,
604	.detach = anx6345_bridge_detach,
605	.mode_valid = anx6345_bridge_mode_valid,
606	.disable = anx6345_bridge_disable,
607	.enable = anx6345_bridge_enable,
608};
609
610static void unregister_i2c_dummy_clients(struct anx6345 *anx6345)
611{
612	unsigned int i;
613
614	for (i = 1; i < ARRAY_SIZE(anx6345->i2c_clients); i++)
615		if (anx6345->i2c_clients[i] &&
616		    anx6345->i2c_clients[i]->addr != anx6345->client->addr)
617			i2c_unregister_device(anx6345->i2c_clients[i]);
618}
619
620static const struct regmap_config anx6345_regmap_config = {
621	.reg_bits = 8,
622	.val_bits = 8,
623	.max_register = 0xff,
624	.cache_type = REGCACHE_NONE,
625};
626
627static const u16 anx6345_chipid_list[] = {
628	0x6345,
629};
630
631static bool anx6345_get_chip_id(struct anx6345 *anx6345)
632{
633	unsigned int i, idl, idh, version;
634
635	if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDL_REG, &idl))
636		return false;
637
638	if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDH_REG, &idh))
639		return false;
640
641	anx6345->chipid = (u8)idl | ((u8)idh << 8);
642
643	if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_VERSION_REG,
644			&version))
645		return false;
646
647	for (i = 0; i < ARRAY_SIZE(anx6345_chipid_list); i++) {
648		if (anx6345->chipid == anx6345_chipid_list[i]) {
649			DRM_INFO("Found ANX%x (ver. %d) eDP Transmitter\n",
650				 anx6345->chipid, version);
651			return true;
652		}
653	}
654
655	DRM_ERROR("ANX%x (ver. %d) not supported by this driver\n",
656		  anx6345->chipid, version);
657
658	return false;
659}
660
661static int anx6345_i2c_probe(struct i2c_client *client)
662{
663	struct anx6345 *anx6345;
664	struct device *dev;
665	int i, err;
666
667	anx6345 = devm_drm_bridge_alloc(&client->dev, struct anx6345, bridge,
668					&anx6345_bridge_funcs);
669	if (IS_ERR(anx6345))
670		return PTR_ERR(anx6345);
671
672	mutex_init(&anx6345->lock);
673
674	anx6345->bridge.of_node = client->dev.of_node;
675
676	anx6345->client = client;
677	i2c_set_clientdata(client, anx6345);
678
679	dev = &anx6345->client->dev;
680
681	err = drm_of_find_panel_or_bridge(client->dev.of_node, 1, 0,
682					  &anx6345->panel, NULL);
683	if (err == -EPROBE_DEFER)
684		return err;
685
686	if (err)
687		DRM_DEBUG("No panel found\n");
688
689	/* 1.2V digital core power regulator  */
690	anx6345->dvdd12 = devm_regulator_get(dev, "dvdd12");
691	if (IS_ERR(anx6345->dvdd12)) {
692		if (PTR_ERR(anx6345->dvdd12) != -EPROBE_DEFER)
693			DRM_ERROR("Failed to get dvdd12 supply (%ld)\n",
694				  PTR_ERR(anx6345->dvdd12));
695		return PTR_ERR(anx6345->dvdd12);
696	}
697
698	/* 2.5V digital core power regulator  */
699	anx6345->dvdd25 = devm_regulator_get(dev, "dvdd25");
700	if (IS_ERR(anx6345->dvdd25)) {
701		if (PTR_ERR(anx6345->dvdd25) != -EPROBE_DEFER)
702			DRM_ERROR("Failed to get dvdd25 supply (%ld)\n",
703				  PTR_ERR(anx6345->dvdd25));
704		return PTR_ERR(anx6345->dvdd25);
705	}
706
707	/* GPIO for chip reset */
708	anx6345->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
709	if (IS_ERR(anx6345->gpiod_reset)) {
710		DRM_ERROR("Reset gpio not found\n");
711		return PTR_ERR(anx6345->gpiod_reset);
712	}
713
714	/* Map slave addresses of ANX6345 */
715	for (i = 0; i < I2C_NUM_ADDRESSES; i++) {
716		if (anx6345_i2c_addresses[i] >> 1 != client->addr)
717			anx6345->i2c_clients[i] = i2c_new_dummy_device(client->adapter,
718						anx6345_i2c_addresses[i] >> 1);
719		else
720			anx6345->i2c_clients[i] = client;
721
722		if (IS_ERR(anx6345->i2c_clients[i])) {
723			err = PTR_ERR(anx6345->i2c_clients[i]);
724			DRM_ERROR("Failed to reserve I2C bus %02x\n",
725				  anx6345_i2c_addresses[i]);
726			goto err_unregister_i2c;
727		}
728
729		anx6345->map[i] = devm_regmap_init_i2c(anx6345->i2c_clients[i],
730						       &anx6345_regmap_config);
731		if (IS_ERR(anx6345->map[i])) {
732			err = PTR_ERR(anx6345->map[i]);
733			DRM_ERROR("Failed regmap initialization %02x\n",
734				  anx6345_i2c_addresses[i]);
735			goto err_unregister_i2c;
736		}
737	}
738
739	/* Look for supported chip ID */
740	anx6345_poweron(anx6345);
741	if (anx6345_get_chip_id(anx6345)) {
742		drm_bridge_add(&anx6345->bridge);
743
744		return 0;
745	} else {
746		anx6345_poweroff(anx6345);
747		err = -ENODEV;
748	}
749
750err_unregister_i2c:
751	unregister_i2c_dummy_clients(anx6345);
752	return err;
753}
754
755static void anx6345_i2c_remove(struct i2c_client *client)
756{
757	struct anx6345 *anx6345 = i2c_get_clientdata(client);
758
759	drm_bridge_remove(&anx6345->bridge);
760
761	unregister_i2c_dummy_clients(anx6345);
762
763	drm_edid_free(anx6345->drm_edid);
764
765	mutex_destroy(&anx6345->lock);
766}
767
768static const struct i2c_device_id anx6345_id[] = {
769	{ "anx6345" },
770	{ /* sentinel */ }
771};
772MODULE_DEVICE_TABLE(i2c, anx6345_id);
773
774static const struct of_device_id anx6345_match_table[] = {
775	{ .compatible = "analogix,anx6345", },
776	{ /* sentinel */ },
777};
778MODULE_DEVICE_TABLE(of, anx6345_match_table);
779
780static struct i2c_driver anx6345_driver = {
781	.driver = {
782		   .name = "anx6345",
783		   .of_match_table = anx6345_match_table,
784		  },
785	.probe = anx6345_i2c_probe,
786	.remove = anx6345_i2c_remove,
787	.id_table = anx6345_id,
788};
789module_i2c_driver(anx6345_driver);
790
791MODULE_DESCRIPTION("ANX6345 eDP Transmitter driver");
792MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");
793MODULE_LICENSE("GPL v2");