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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 struct edid *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 /*
147 * Power up the sink (DP_SET_POWER register is only available on DPCD
148 * v1.1 and later).
149 */
150 if (anx6345->dpcd[DP_DPCD_REV] >= 0x11) {
151 err = drm_dp_dpcd_readb(&anx6345->aux, DP_SET_POWER, &dpcd[0]);
152 if (err < 0) {
153 DRM_ERROR("Failed to read DP_SET_POWER register: %d\n",
154 err);
155 return err;
156 }
157
158 dpcd[0] &= ~DP_SET_POWER_MASK;
159 dpcd[0] |= DP_SET_POWER_D0;
160
161 err = drm_dp_dpcd_writeb(&anx6345->aux, DP_SET_POWER, dpcd[0]);
162 if (err < 0) {
163 DRM_ERROR("Failed to power up DisplayPort link: %d\n",
164 err);
165 return err;
166 }
167
168 /*
169 * According to the DP 1.1 specification, a "Sink Device must
170 * exit the power saving state within 1 ms" (Section 2.5.3.1,
171 * Table 5-52, "Sink Control Field" (register 0x600).
172 */
173 usleep_range(1000, 2000);
174 }
175
176 /* Possibly enable downspread on the sink */
177 err = regmap_write(anx6345->map[I2C_IDX_DPTX],
178 SP_DP_DOWNSPREAD_CTRL1_REG, 0);
179 if (err)
180 return err;
181
182 if (anx6345->dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5) {
183 DRM_DEBUG("Enable downspread on the sink\n");
184 /* 4000PPM */
185 err = regmap_write(anx6345->map[I2C_IDX_DPTX],
186 SP_DP_DOWNSPREAD_CTRL1_REG, 8);
187 if (err)
188 return err;
189
190 err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL,
191 DP_SPREAD_AMP_0_5);
192 if (err < 0)
193 return err;
194 } else {
195 err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL, 0);
196 if (err < 0)
197 return err;
198 }
199
200 /* Set the lane count and the link rate on the sink */
201 if (drm_dp_enhanced_frame_cap(anx6345->dpcd))
202 err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
203 SP_DP_SYSTEM_CTRL_BASE + 4,
204 SP_ENHANCED_MODE);
205 else
206 err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX],
207 SP_DP_SYSTEM_CTRL_BASE + 4,
208 SP_ENHANCED_MODE);
209 if (err)
210 return err;
211
212 dpcd[0] = dp_bw;
213 err = regmap_write(anx6345->map[I2C_IDX_DPTX],
214 SP_DP_MAIN_LINK_BW_SET_REG, dpcd[0]);
215 if (err)
216 return err;
217
218 dpcd[1] = drm_dp_max_lane_count(anx6345->dpcd);
219
220 err = regmap_write(anx6345->map[I2C_IDX_DPTX],
221 SP_DP_LANE_COUNT_SET_REG, dpcd[1]);
222 if (err)
223 return err;
224
225 if (drm_dp_enhanced_frame_cap(anx6345->dpcd))
226 dpcd[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
227
228 err = drm_dp_dpcd_write(&anx6345->aux, DP_LINK_BW_SET, dpcd,
229 sizeof(dpcd));
230
231 if (err < 0) {
232 DRM_ERROR("Failed to configure link: %d\n", err);
233 return err;
234 }
235
236 /* Start training on the source */
237 err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_LT_CTRL_REG,
238 SP_LT_EN);
239 if (err)
240 return err;
241
242 return regmap_read_poll_timeout(anx6345->map[I2C_IDX_DPTX],
243 SP_DP_LT_CTRL_REG,
244 value, !(value & SP_DP_LT_INPROGRESS),
245 POLL_DELAY, POLL_TIMEOUT);
246}
247
248static int anx6345_tx_initialization(struct anx6345 *anx6345)
249{
250 int err, i;
251
252 /* FIXME: colordepth is hardcoded for now */
253 err = regmap_write(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL2_REG,
254 SP_IN_BPC_6BIT << SP_IN_BPC_SHIFT);
255 if (err)
256 return err;
257
258 err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_PLL_CTRL_REG, 0);
259 if (err)
260 return err;
261
262 err = regmap_write(anx6345->map[I2C_IDX_TXCOM],
263 SP_ANALOG_DEBUG1_REG, 0);
264 if (err)
265 return err;
266
267 err = regmap_write(anx6345->map[I2C_IDX_DPTX],
268 SP_DP_LINK_DEBUG_CTRL_REG,
269 SP_NEW_PRBS7 | SP_M_VID_DEBUG);
270 if (err)
271 return err;
272
273 err = regmap_write(anx6345->map[I2C_IDX_DPTX],
274 SP_DP_ANALOG_POWER_DOWN_REG, 0);
275 if (err)
276 return err;
277
278 /* Force HPD */
279 err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
280 SP_DP_SYSTEM_CTRL_BASE + 3,
281 SP_HPD_FORCE | SP_HPD_CTRL);
282 if (err)
283 return err;
284
285 for (i = 0; i < 4; i++) {
286 /* 4 lanes */
287 err = regmap_write(anx6345->map[I2C_IDX_DPTX],
288 SP_DP_LANE0_LT_CTRL_REG + i, 0);
289 if (err)
290 return err;
291 }
292
293 /* Reset AUX */
294 err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM],
295 SP_RESET_CTRL2_REG, SP_AUX_RST);
296 if (err)
297 return err;
298
299 return anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
300 SP_RESET_CTRL2_REG, SP_AUX_RST);
301}
302
303static void anx6345_poweron(struct anx6345 *anx6345)
304{
305 int err;
306
307 /* Ensure reset is asserted before starting power on sequence */
308 gpiod_set_value_cansleep(anx6345->gpiod_reset, 1);
309 usleep_range(1000, 2000);
310
311 err = regulator_enable(anx6345->dvdd12);
312 if (err) {
313 DRM_ERROR("Failed to enable dvdd12 regulator: %d\n",
314 err);
315 return;
316 }
317
318 /* T1 - delay between VDD12 and VDD25 should be 0-2ms */
319 usleep_range(1000, 2000);
320
321 err = regulator_enable(anx6345->dvdd25);
322 if (err) {
323 DRM_ERROR("Failed to enable dvdd25 regulator: %d\n",
324 err);
325 return;
326 }
327
328 /* T2 - delay between RESETN and all power rail stable,
329 * should be 2-5ms
330 */
331 usleep_range(2000, 5000);
332
333 gpiod_set_value_cansleep(anx6345->gpiod_reset, 0);
334
335 /* Power on registers module */
336 anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
337 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
338 anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
339 SP_REGISTER_PD | SP_TOTAL_PD);
340
341 if (anx6345->panel)
342 drm_panel_prepare(anx6345->panel);
343
344 anx6345->powered = true;
345}
346
347static void anx6345_poweroff(struct anx6345 *anx6345)
348{
349 int err;
350
351 gpiod_set_value_cansleep(anx6345->gpiod_reset, 1);
352 usleep_range(1000, 2000);
353
354 if (anx6345->panel)
355 drm_panel_unprepare(anx6345->panel);
356
357 err = regulator_disable(anx6345->dvdd25);
358 if (err) {
359 DRM_ERROR("Failed to disable dvdd25 regulator: %d\n",
360 err);
361 return;
362 }
363
364 usleep_range(5000, 10000);
365
366 err = regulator_disable(anx6345->dvdd12);
367 if (err) {
368 DRM_ERROR("Failed to disable dvdd12 regulator: %d\n",
369 err);
370 return;
371 }
372
373 usleep_range(1000, 2000);
374
375 anx6345->powered = false;
376}
377
378static int anx6345_start(struct anx6345 *anx6345)
379{
380 int err;
381
382 if (!anx6345->powered)
383 anx6345_poweron(anx6345);
384
385 /* Power on needed modules */
386 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
387 SP_POWERDOWN_CTRL_REG,
388 SP_VIDEO_PD | SP_LINK_PD);
389
390 err = anx6345_tx_initialization(anx6345);
391 if (err) {
392 DRM_ERROR("Failed eDP transmitter initialization: %d\n", err);
393 anx6345_poweroff(anx6345);
394 return err;
395 }
396
397 err = anx6345_dp_link_training(anx6345);
398 if (err) {
399 DRM_ERROR("Failed link training: %d\n", err);
400 anx6345_poweroff(anx6345);
401 return err;
402 }
403
404 /*
405 * This delay seems to help keep the hardware in a good state. Without
406 * it, there are times where it fails silently.
407 */
408 usleep_range(10000, 15000);
409
410 return 0;
411}
412
413static int anx6345_config_dp_output(struct anx6345 *anx6345)
414{
415 int err;
416
417 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG,
418 SP_VIDEO_MUTE);
419 if (err)
420 return err;
421
422 /* Enable DP output */
423 err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG,
424 SP_VIDEO_EN);
425 if (err)
426 return err;
427
428 /* Force stream valid */
429 return anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
430 SP_DP_SYSTEM_CTRL_BASE + 3,
431 SP_STRM_FORCE | SP_STRM_CTRL);
432}
433
434static int anx6345_get_downstream_info(struct anx6345 *anx6345)
435{
436 u8 value;
437 int err;
438
439 err = drm_dp_dpcd_readb(&anx6345->aux, DP_SINK_COUNT, &value);
440 if (err < 0) {
441 DRM_ERROR("Get sink count failed %d\n", err);
442 return err;
443 }
444
445 if (!DP_GET_SINK_COUNT(value)) {
446 DRM_ERROR("Downstream disconnected\n");
447 return -EIO;
448 }
449
450 return 0;
451}
452
453static int anx6345_get_modes(struct drm_connector *connector)
454{
455 struct anx6345 *anx6345 = connector_to_anx6345(connector);
456 int err, num_modes = 0;
457 bool power_off = false;
458
459 mutex_lock(&anx6345->lock);
460
461 if (!anx6345->edid) {
462 if (!anx6345->powered) {
463 anx6345_poweron(anx6345);
464 power_off = true;
465 }
466
467 err = anx6345_get_downstream_info(anx6345);
468 if (err) {
469 DRM_ERROR("Failed to get downstream info: %d\n", err);
470 goto unlock;
471 }
472
473 anx6345->edid = drm_get_edid(connector, &anx6345->aux.ddc);
474 if (!anx6345->edid)
475 DRM_ERROR("Failed to read EDID from panel\n");
476
477 err = drm_connector_update_edid_property(connector,
478 anx6345->edid);
479 if (err) {
480 DRM_ERROR("Failed to update EDID property: %d\n", err);
481 goto unlock;
482 }
483 }
484
485 num_modes += drm_add_edid_modes(connector, anx6345->edid);
486
487 /* Driver currently supports only 6bpc */
488 connector->display_info.bpc = 6;
489
490unlock:
491 if (power_off)
492 anx6345_poweroff(anx6345);
493
494 mutex_unlock(&anx6345->lock);
495
496 if (!num_modes && anx6345->panel)
497 num_modes += drm_panel_get_modes(anx6345->panel, connector);
498
499 return num_modes;
500}
501
502static const struct drm_connector_helper_funcs anx6345_connector_helper_funcs = {
503 .get_modes = anx6345_get_modes,
504};
505
506static void
507anx6345_connector_destroy(struct drm_connector *connector)
508{
509 drm_connector_cleanup(connector);
510}
511
512static const struct drm_connector_funcs anx6345_connector_funcs = {
513 .fill_modes = drm_helper_probe_single_connector_modes,
514 .destroy = anx6345_connector_destroy,
515 .reset = drm_atomic_helper_connector_reset,
516 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
517 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
518};
519
520static int anx6345_bridge_attach(struct drm_bridge *bridge,
521 enum drm_bridge_attach_flags flags)
522{
523 struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
524 int err;
525
526 if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
527 DRM_ERROR("Fix bridge driver to make connector optional!");
528 return -EINVAL;
529 }
530
531 if (!bridge->encoder) {
532 DRM_ERROR("Parent encoder object not found");
533 return -ENODEV;
534 }
535
536 /* Register aux channel */
537 anx6345->aux.name = "DP-AUX";
538 anx6345->aux.dev = &anx6345->client->dev;
539 anx6345->aux.drm_dev = bridge->dev;
540 anx6345->aux.transfer = anx6345_aux_transfer;
541
542 err = drm_dp_aux_register(&anx6345->aux);
543 if (err < 0) {
544 DRM_ERROR("Failed to register aux channel: %d\n", err);
545 return err;
546 }
547
548 err = drm_connector_init(bridge->dev, &anx6345->connector,
549 &anx6345_connector_funcs,
550 DRM_MODE_CONNECTOR_eDP);
551 if (err) {
552 DRM_ERROR("Failed to initialize connector: %d\n", err);
553 goto aux_unregister;
554 }
555
556 drm_connector_helper_add(&anx6345->connector,
557 &anx6345_connector_helper_funcs);
558
559 anx6345->connector.polled = DRM_CONNECTOR_POLL_HPD;
560
561 err = drm_connector_attach_encoder(&anx6345->connector,
562 bridge->encoder);
563 if (err) {
564 DRM_ERROR("Failed to link up connector to encoder: %d\n", err);
565 goto connector_cleanup;
566 }
567
568 err = drm_connector_register(&anx6345->connector);
569 if (err) {
570 DRM_ERROR("Failed to register connector: %d\n", err);
571 goto connector_cleanup;
572 }
573
574 return 0;
575connector_cleanup:
576 drm_connector_cleanup(&anx6345->connector);
577aux_unregister:
578 drm_dp_aux_unregister(&anx6345->aux);
579 return err;
580}
581
582static void anx6345_bridge_detach(struct drm_bridge *bridge)
583{
584 drm_dp_aux_unregister(&bridge_to_anx6345(bridge)->aux);
585}
586
587static enum drm_mode_status
588anx6345_bridge_mode_valid(struct drm_bridge *bridge,
589 const struct drm_display_info *info,
590 const struct drm_display_mode *mode)
591{
592 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
593 return MODE_NO_INTERLACE;
594
595 /* Max 1200p at 5.4 Ghz, one lane */
596 if (mode->clock > 154000)
597 return MODE_CLOCK_HIGH;
598
599 return MODE_OK;
600}
601
602static void anx6345_bridge_disable(struct drm_bridge *bridge)
603{
604 struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
605
606 /* Power off all modules except configuration registers access */
607 anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
608 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
609 if (anx6345->panel)
610 drm_panel_disable(anx6345->panel);
611
612 if (anx6345->powered)
613 anx6345_poweroff(anx6345);
614}
615
616static void anx6345_bridge_enable(struct drm_bridge *bridge)
617{
618 struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
619 int err;
620
621 if (anx6345->panel)
622 drm_panel_enable(anx6345->panel);
623
624 err = anx6345_start(anx6345);
625 if (err) {
626 DRM_ERROR("Failed to initialize: %d\n", err);
627 return;
628 }
629
630 err = anx6345_config_dp_output(anx6345);
631 if (err)
632 DRM_ERROR("Failed to enable DP output: %d\n", err);
633}
634
635static const struct drm_bridge_funcs anx6345_bridge_funcs = {
636 .attach = anx6345_bridge_attach,
637 .detach = anx6345_bridge_detach,
638 .mode_valid = anx6345_bridge_mode_valid,
639 .disable = anx6345_bridge_disable,
640 .enable = anx6345_bridge_enable,
641};
642
643static void unregister_i2c_dummy_clients(struct anx6345 *anx6345)
644{
645 unsigned int i;
646
647 for (i = 1; i < ARRAY_SIZE(anx6345->i2c_clients); i++)
648 if (anx6345->i2c_clients[i] &&
649 anx6345->i2c_clients[i]->addr != anx6345->client->addr)
650 i2c_unregister_device(anx6345->i2c_clients[i]);
651}
652
653static const struct regmap_config anx6345_regmap_config = {
654 .reg_bits = 8,
655 .val_bits = 8,
656 .max_register = 0xff,
657 .cache_type = REGCACHE_NONE,
658};
659
660static const u16 anx6345_chipid_list[] = {
661 0x6345,
662};
663
664static bool anx6345_get_chip_id(struct anx6345 *anx6345)
665{
666 unsigned int i, idl, idh, version;
667
668 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDL_REG, &idl))
669 return false;
670
671 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDH_REG, &idh))
672 return false;
673
674 anx6345->chipid = (u8)idl | ((u8)idh << 8);
675
676 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_VERSION_REG,
677 &version))
678 return false;
679
680 for (i = 0; i < ARRAY_SIZE(anx6345_chipid_list); i++) {
681 if (anx6345->chipid == anx6345_chipid_list[i]) {
682 DRM_INFO("Found ANX%x (ver. %d) eDP Transmitter\n",
683 anx6345->chipid, version);
684 return true;
685 }
686 }
687
688 DRM_ERROR("ANX%x (ver. %d) not supported by this driver\n",
689 anx6345->chipid, version);
690
691 return false;
692}
693
694static int anx6345_i2c_probe(struct i2c_client *client)
695{
696 struct anx6345 *anx6345;
697 struct device *dev;
698 int i, err;
699
700 anx6345 = devm_kzalloc(&client->dev, sizeof(*anx6345), GFP_KERNEL);
701 if (!anx6345)
702 return -ENOMEM;
703
704 mutex_init(&anx6345->lock);
705
706 anx6345->bridge.of_node = client->dev.of_node;
707
708 anx6345->client = client;
709 i2c_set_clientdata(client, anx6345);
710
711 dev = &anx6345->client->dev;
712
713 err = drm_of_find_panel_or_bridge(client->dev.of_node, 1, 0,
714 &anx6345->panel, NULL);
715 if (err == -EPROBE_DEFER)
716 return err;
717
718 if (err)
719 DRM_DEBUG("No panel found\n");
720
721 /* 1.2V digital core power regulator */
722 anx6345->dvdd12 = devm_regulator_get(dev, "dvdd12");
723 if (IS_ERR(anx6345->dvdd12)) {
724 if (PTR_ERR(anx6345->dvdd12) != -EPROBE_DEFER)
725 DRM_ERROR("Failed to get dvdd12 supply (%ld)\n",
726 PTR_ERR(anx6345->dvdd12));
727 return PTR_ERR(anx6345->dvdd12);
728 }
729
730 /* 2.5V digital core power regulator */
731 anx6345->dvdd25 = devm_regulator_get(dev, "dvdd25");
732 if (IS_ERR(anx6345->dvdd25)) {
733 if (PTR_ERR(anx6345->dvdd25) != -EPROBE_DEFER)
734 DRM_ERROR("Failed to get dvdd25 supply (%ld)\n",
735 PTR_ERR(anx6345->dvdd25));
736 return PTR_ERR(anx6345->dvdd25);
737 }
738
739 /* GPIO for chip reset */
740 anx6345->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
741 if (IS_ERR(anx6345->gpiod_reset)) {
742 DRM_ERROR("Reset gpio not found\n");
743 return PTR_ERR(anx6345->gpiod_reset);
744 }
745
746 /* Map slave addresses of ANX6345 */
747 for (i = 0; i < I2C_NUM_ADDRESSES; i++) {
748 if (anx6345_i2c_addresses[i] >> 1 != client->addr)
749 anx6345->i2c_clients[i] = i2c_new_dummy_device(client->adapter,
750 anx6345_i2c_addresses[i] >> 1);
751 else
752 anx6345->i2c_clients[i] = client;
753
754 if (IS_ERR(anx6345->i2c_clients[i])) {
755 err = PTR_ERR(anx6345->i2c_clients[i]);
756 DRM_ERROR("Failed to reserve I2C bus %02x\n",
757 anx6345_i2c_addresses[i]);
758 goto err_unregister_i2c;
759 }
760
761 anx6345->map[i] = devm_regmap_init_i2c(anx6345->i2c_clients[i],
762 &anx6345_regmap_config);
763 if (IS_ERR(anx6345->map[i])) {
764 err = PTR_ERR(anx6345->map[i]);
765 DRM_ERROR("Failed regmap initialization %02x\n",
766 anx6345_i2c_addresses[i]);
767 goto err_unregister_i2c;
768 }
769 }
770
771 /* Look for supported chip ID */
772 anx6345_poweron(anx6345);
773 if (anx6345_get_chip_id(anx6345)) {
774 anx6345->bridge.funcs = &anx6345_bridge_funcs;
775 drm_bridge_add(&anx6345->bridge);
776
777 return 0;
778 } else {
779 anx6345_poweroff(anx6345);
780 err = -ENODEV;
781 }
782
783err_unregister_i2c:
784 unregister_i2c_dummy_clients(anx6345);
785 return err;
786}
787
788static void anx6345_i2c_remove(struct i2c_client *client)
789{
790 struct anx6345 *anx6345 = i2c_get_clientdata(client);
791
792 drm_bridge_remove(&anx6345->bridge);
793
794 unregister_i2c_dummy_clients(anx6345);
795
796 kfree(anx6345->edid);
797
798 mutex_destroy(&anx6345->lock);
799}
800
801static const struct i2c_device_id anx6345_id[] = {
802 { "anx6345", 0 },
803 { /* sentinel */ }
804};
805MODULE_DEVICE_TABLE(i2c, anx6345_id);
806
807static const struct of_device_id anx6345_match_table[] = {
808 { .compatible = "analogix,anx6345", },
809 { /* sentinel */ },
810};
811MODULE_DEVICE_TABLE(of, anx6345_match_table);
812
813static struct i2c_driver anx6345_driver = {
814 .driver = {
815 .name = "anx6345",
816 .of_match_table = anx6345_match_table,
817 },
818 .probe = anx6345_i2c_probe,
819 .remove = anx6345_i2c_remove,
820 .id_table = anx6345_id,
821};
822module_i2c_driver(anx6345_driver);
823
824MODULE_DESCRIPTION("ANX6345 eDP Transmitter driver");
825MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");
826MODULE_LICENSE("GPL v2");
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/drm_atomic_helper.h>
22#include <drm/drm_bridge.h>
23#include <drm/drm_crtc.h>
24#include <drm/drm_crtc_helper.h>
25#include <drm/drm_dp_helper.h>
26#include <drm/drm_edid.h>
27#include <drm/drm_of.h>
28#include <drm/drm_panel.h>
29#include <drm/drm_print.h>
30#include <drm/drm_probe_helper.h>
31
32#include "analogix-i2c-dptx.h"
33#include "analogix-i2c-txcommon.h"
34
35#define POLL_DELAY 50000 /* us */
36#define POLL_TIMEOUT 5000000 /* us */
37
38#define I2C_IDX_DPTX 0
39#define I2C_IDX_TXCOM 1
40
41static const u8 anx6345_i2c_addresses[] = {
42 [I2C_IDX_DPTX] = 0x70,
43 [I2C_IDX_TXCOM] = 0x72,
44};
45#define I2C_NUM_ADDRESSES ARRAY_SIZE(anx6345_i2c_addresses)
46
47struct anx6345 {
48 struct drm_dp_aux aux;
49 struct drm_bridge bridge;
50 struct i2c_client *client;
51 struct edid *edid;
52 struct drm_connector connector;
53 struct drm_panel *panel;
54 struct regulator *dvdd12;
55 struct regulator *dvdd25;
56 struct gpio_desc *gpiod_reset;
57 struct mutex lock; /* protect EDID access */
58
59 /* I2C Slave addresses of ANX6345 are mapped as DPTX and SYS */
60 struct i2c_client *i2c_clients[I2C_NUM_ADDRESSES];
61 struct regmap *map[I2C_NUM_ADDRESSES];
62
63 u16 chipid;
64 u8 dpcd[DP_RECEIVER_CAP_SIZE];
65
66 bool powered;
67};
68
69static inline struct anx6345 *connector_to_anx6345(struct drm_connector *c)
70{
71 return container_of(c, struct anx6345, connector);
72}
73
74static inline struct anx6345 *bridge_to_anx6345(struct drm_bridge *bridge)
75{
76 return container_of(bridge, struct anx6345, bridge);
77}
78
79static int anx6345_set_bits(struct regmap *map, u8 reg, u8 mask)
80{
81 return regmap_update_bits(map, reg, mask, mask);
82}
83
84static int anx6345_clear_bits(struct regmap *map, u8 reg, u8 mask)
85{
86 return regmap_update_bits(map, reg, mask, 0);
87}
88
89static ssize_t anx6345_aux_transfer(struct drm_dp_aux *aux,
90 struct drm_dp_aux_msg *msg)
91{
92 struct anx6345 *anx6345 = container_of(aux, struct anx6345, aux);
93
94 return anx_dp_aux_transfer(anx6345->map[I2C_IDX_DPTX], msg);
95}
96
97static int anx6345_dp_link_training(struct anx6345 *anx6345)
98{
99 unsigned int value;
100 u8 dp_bw, dpcd[2];
101 int err;
102
103 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
104 SP_POWERDOWN_CTRL_REG,
105 SP_TOTAL_PD);
106 if (err)
107 return err;
108
109 err = drm_dp_dpcd_readb(&anx6345->aux, DP_MAX_LINK_RATE, &dp_bw);
110 if (err < 0)
111 return err;
112
113 switch (dp_bw) {
114 case DP_LINK_BW_1_62:
115 case DP_LINK_BW_2_7:
116 break;
117
118 default:
119 DRM_DEBUG_KMS("DP bandwidth (%#02x) not supported\n", dp_bw);
120 return -EINVAL;
121 }
122
123 err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG,
124 SP_VIDEO_MUTE);
125 if (err)
126 return err;
127
128 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
129 SP_VID_CTRL1_REG, SP_VIDEO_EN);
130 if (err)
131 return err;
132
133 /* Get DPCD info */
134 err = drm_dp_dpcd_read(&anx6345->aux, DP_DPCD_REV,
135 &anx6345->dpcd, DP_RECEIVER_CAP_SIZE);
136 if (err < 0) {
137 DRM_ERROR("Failed to read DPCD: %d\n", err);
138 return err;
139 }
140
141 /* Clear channel x SERDES power down */
142 err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX],
143 SP_DP_ANALOG_POWER_DOWN_REG, SP_CH0_PD);
144 if (err)
145 return err;
146
147 /*
148 * Power up the sink (DP_SET_POWER register is only available on DPCD
149 * v1.1 and later).
150 */
151 if (anx6345->dpcd[DP_DPCD_REV] >= 0x11) {
152 err = drm_dp_dpcd_readb(&anx6345->aux, DP_SET_POWER, &dpcd[0]);
153 if (err < 0) {
154 DRM_ERROR("Failed to read DP_SET_POWER register: %d\n",
155 err);
156 return err;
157 }
158
159 dpcd[0] &= ~DP_SET_POWER_MASK;
160 dpcd[0] |= DP_SET_POWER_D0;
161
162 err = drm_dp_dpcd_writeb(&anx6345->aux, DP_SET_POWER, dpcd[0]);
163 if (err < 0) {
164 DRM_ERROR("Failed to power up DisplayPort link: %d\n",
165 err);
166 return err;
167 }
168
169 /*
170 * According to the DP 1.1 specification, a "Sink Device must
171 * exit the power saving state within 1 ms" (Section 2.5.3.1,
172 * Table 5-52, "Sink Control Field" (register 0x600).
173 */
174 usleep_range(1000, 2000);
175 }
176
177 /* Possibly enable downspread on the sink */
178 err = regmap_write(anx6345->map[I2C_IDX_DPTX],
179 SP_DP_DOWNSPREAD_CTRL1_REG, 0);
180 if (err)
181 return err;
182
183 if (anx6345->dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5) {
184 DRM_DEBUG("Enable downspread on the sink\n");
185 /* 4000PPM */
186 err = regmap_write(anx6345->map[I2C_IDX_DPTX],
187 SP_DP_DOWNSPREAD_CTRL1_REG, 8);
188 if (err)
189 return err;
190
191 err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL,
192 DP_SPREAD_AMP_0_5);
193 if (err < 0)
194 return err;
195 } else {
196 err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL, 0);
197 if (err < 0)
198 return err;
199 }
200
201 /* Set the lane count and the link rate on the sink */
202 if (drm_dp_enhanced_frame_cap(anx6345->dpcd))
203 err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
204 SP_DP_SYSTEM_CTRL_BASE + 4,
205 SP_ENHANCED_MODE);
206 else
207 err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX],
208 SP_DP_SYSTEM_CTRL_BASE + 4,
209 SP_ENHANCED_MODE);
210 if (err)
211 return err;
212
213 dpcd[0] = dp_bw;
214 err = regmap_write(anx6345->map[I2C_IDX_DPTX],
215 SP_DP_MAIN_LINK_BW_SET_REG, dpcd[0]);
216 if (err)
217 return err;
218
219 dpcd[1] = drm_dp_max_lane_count(anx6345->dpcd);
220
221 err = regmap_write(anx6345->map[I2C_IDX_DPTX],
222 SP_DP_LANE_COUNT_SET_REG, dpcd[1]);
223 if (err)
224 return err;
225
226 if (drm_dp_enhanced_frame_cap(anx6345->dpcd))
227 dpcd[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
228
229 err = drm_dp_dpcd_write(&anx6345->aux, DP_LINK_BW_SET, dpcd,
230 sizeof(dpcd));
231
232 if (err < 0) {
233 DRM_ERROR("Failed to configure link: %d\n", err);
234 return err;
235 }
236
237 /* Start training on the source */
238 err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_LT_CTRL_REG,
239 SP_LT_EN);
240 if (err)
241 return err;
242
243 return regmap_read_poll_timeout(anx6345->map[I2C_IDX_DPTX],
244 SP_DP_LT_CTRL_REG,
245 value, !(value & SP_DP_LT_INPROGRESS),
246 POLL_DELAY, POLL_TIMEOUT);
247}
248
249static int anx6345_tx_initialization(struct anx6345 *anx6345)
250{
251 int err, i;
252
253 /* FIXME: colordepth is hardcoded for now */
254 err = regmap_write(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL2_REG,
255 SP_IN_BPC_6BIT << SP_IN_BPC_SHIFT);
256 if (err)
257 return err;
258
259 err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_PLL_CTRL_REG, 0);
260 if (err)
261 return err;
262
263 err = regmap_write(anx6345->map[I2C_IDX_TXCOM],
264 SP_ANALOG_DEBUG1_REG, 0);
265 if (err)
266 return err;
267
268 err = regmap_write(anx6345->map[I2C_IDX_DPTX],
269 SP_DP_LINK_DEBUG_CTRL_REG,
270 SP_NEW_PRBS7 | SP_M_VID_DEBUG);
271 if (err)
272 return err;
273
274 err = regmap_write(anx6345->map[I2C_IDX_DPTX],
275 SP_DP_ANALOG_POWER_DOWN_REG, 0);
276 if (err)
277 return err;
278
279 /* Force HPD */
280 err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
281 SP_DP_SYSTEM_CTRL_BASE + 3,
282 SP_HPD_FORCE | SP_HPD_CTRL);
283 if (err)
284 return err;
285
286 for (i = 0; i < 4; i++) {
287 /* 4 lanes */
288 err = regmap_write(anx6345->map[I2C_IDX_DPTX],
289 SP_DP_LANE0_LT_CTRL_REG + i, 0);
290 if (err)
291 return err;
292 }
293
294 /* Reset AUX */
295 err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM],
296 SP_RESET_CTRL2_REG, SP_AUX_RST);
297 if (err)
298 return err;
299
300 return anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
301 SP_RESET_CTRL2_REG, SP_AUX_RST);
302}
303
304static void anx6345_poweron(struct anx6345 *anx6345)
305{
306 int err;
307
308 /* Ensure reset is asserted before starting power on sequence */
309 gpiod_set_value_cansleep(anx6345->gpiod_reset, 1);
310 usleep_range(1000, 2000);
311
312 err = regulator_enable(anx6345->dvdd12);
313 if (err) {
314 DRM_ERROR("Failed to enable dvdd12 regulator: %d\n",
315 err);
316 return;
317 }
318
319 /* T1 - delay between VDD12 and VDD25 should be 0-2ms */
320 usleep_range(1000, 2000);
321
322 err = regulator_enable(anx6345->dvdd25);
323 if (err) {
324 DRM_ERROR("Failed to enable dvdd25 regulator: %d\n",
325 err);
326 return;
327 }
328
329 /* T2 - delay between RESETN and all power rail stable,
330 * should be 2-5ms
331 */
332 usleep_range(2000, 5000);
333
334 gpiod_set_value_cansleep(anx6345->gpiod_reset, 0);
335
336 /* Power on registers module */
337 anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
338 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
339 anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
340 SP_REGISTER_PD | SP_TOTAL_PD);
341
342 if (anx6345->panel)
343 drm_panel_prepare(anx6345->panel);
344
345 anx6345->powered = true;
346}
347
348static void anx6345_poweroff(struct anx6345 *anx6345)
349{
350 int err;
351
352 gpiod_set_value_cansleep(anx6345->gpiod_reset, 1);
353 usleep_range(1000, 2000);
354
355 if (anx6345->panel)
356 drm_panel_unprepare(anx6345->panel);
357
358 err = regulator_disable(anx6345->dvdd25);
359 if (err) {
360 DRM_ERROR("Failed to disable dvdd25 regulator: %d\n",
361 err);
362 return;
363 }
364
365 usleep_range(5000, 10000);
366
367 err = regulator_disable(anx6345->dvdd12);
368 if (err) {
369 DRM_ERROR("Failed to disable dvdd12 regulator: %d\n",
370 err);
371 return;
372 }
373
374 usleep_range(1000, 2000);
375
376 anx6345->powered = false;
377}
378
379static int anx6345_start(struct anx6345 *anx6345)
380{
381 int err;
382
383 if (!anx6345->powered)
384 anx6345_poweron(anx6345);
385
386 /* Power on needed modules */
387 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
388 SP_POWERDOWN_CTRL_REG,
389 SP_VIDEO_PD | SP_LINK_PD);
390
391 err = anx6345_tx_initialization(anx6345);
392 if (err) {
393 DRM_ERROR("Failed eDP transmitter initialization: %d\n", err);
394 anx6345_poweroff(anx6345);
395 return err;
396 }
397
398 err = anx6345_dp_link_training(anx6345);
399 if (err) {
400 DRM_ERROR("Failed link training: %d\n", err);
401 anx6345_poweroff(anx6345);
402 return err;
403 }
404
405 /*
406 * This delay seems to help keep the hardware in a good state. Without
407 * it, there are times where it fails silently.
408 */
409 usleep_range(10000, 15000);
410
411 return 0;
412}
413
414static int anx6345_config_dp_output(struct anx6345 *anx6345)
415{
416 int err;
417
418 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG,
419 SP_VIDEO_MUTE);
420 if (err)
421 return err;
422
423 /* Enable DP output */
424 err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG,
425 SP_VIDEO_EN);
426 if (err)
427 return err;
428
429 /* Force stream valid */
430 return anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
431 SP_DP_SYSTEM_CTRL_BASE + 3,
432 SP_STRM_FORCE | SP_STRM_CTRL);
433}
434
435static int anx6345_get_downstream_info(struct anx6345 *anx6345)
436{
437 u8 value;
438 int err;
439
440 err = drm_dp_dpcd_readb(&anx6345->aux, DP_SINK_COUNT, &value);
441 if (err < 0) {
442 DRM_ERROR("Get sink count failed %d\n", err);
443 return err;
444 }
445
446 if (!DP_GET_SINK_COUNT(value)) {
447 DRM_ERROR("Downstream disconnected\n");
448 return -EIO;
449 }
450
451 return 0;
452}
453
454static int anx6345_get_modes(struct drm_connector *connector)
455{
456 struct anx6345 *anx6345 = connector_to_anx6345(connector);
457 int err, num_modes = 0;
458 bool power_off = false;
459
460 mutex_lock(&anx6345->lock);
461
462 if (!anx6345->edid) {
463 if (!anx6345->powered) {
464 anx6345_poweron(anx6345);
465 power_off = true;
466 }
467
468 err = anx6345_get_downstream_info(anx6345);
469 if (err) {
470 DRM_ERROR("Failed to get downstream info: %d\n", err);
471 goto unlock;
472 }
473
474 anx6345->edid = drm_get_edid(connector, &anx6345->aux.ddc);
475 if (!anx6345->edid)
476 DRM_ERROR("Failed to read EDID from panel\n");
477
478 err = drm_connector_update_edid_property(connector,
479 anx6345->edid);
480 if (err) {
481 DRM_ERROR("Failed to update EDID property: %d\n", err);
482 goto unlock;
483 }
484 }
485
486 num_modes += drm_add_edid_modes(connector, anx6345->edid);
487
488 /* Driver currently supports only 6bpc */
489 connector->display_info.bpc = 6;
490
491unlock:
492 if (power_off)
493 anx6345_poweroff(anx6345);
494
495 mutex_unlock(&anx6345->lock);
496
497 if (!num_modes && anx6345->panel)
498 num_modes += drm_panel_get_modes(anx6345->panel, connector);
499
500 return num_modes;
501}
502
503static const struct drm_connector_helper_funcs anx6345_connector_helper_funcs = {
504 .get_modes = anx6345_get_modes,
505};
506
507static void
508anx6345_connector_destroy(struct drm_connector *connector)
509{
510 struct anx6345 *anx6345 = connector_to_anx6345(connector);
511
512 if (anx6345->panel)
513 drm_panel_detach(anx6345->panel);
514 drm_connector_cleanup(connector);
515}
516
517static const struct drm_connector_funcs anx6345_connector_funcs = {
518 .fill_modes = drm_helper_probe_single_connector_modes,
519 .destroy = anx6345_connector_destroy,
520 .reset = drm_atomic_helper_connector_reset,
521 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
522 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
523};
524
525static int anx6345_bridge_attach(struct drm_bridge *bridge,
526 enum drm_bridge_attach_flags flags)
527{
528 struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
529 int err;
530
531 if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
532 DRM_ERROR("Fix bridge driver to make connector optional!");
533 return -EINVAL;
534 }
535
536 if (!bridge->encoder) {
537 DRM_ERROR("Parent encoder object not found");
538 return -ENODEV;
539 }
540
541 /* Register aux channel */
542 anx6345->aux.name = "DP-AUX";
543 anx6345->aux.dev = &anx6345->client->dev;
544 anx6345->aux.transfer = anx6345_aux_transfer;
545
546 err = drm_dp_aux_register(&anx6345->aux);
547 if (err < 0) {
548 DRM_ERROR("Failed to register aux channel: %d\n", err);
549 return err;
550 }
551
552 err = drm_connector_init(bridge->dev, &anx6345->connector,
553 &anx6345_connector_funcs,
554 DRM_MODE_CONNECTOR_eDP);
555 if (err) {
556 DRM_ERROR("Failed to initialize connector: %d\n", err);
557 return err;
558 }
559
560 drm_connector_helper_add(&anx6345->connector,
561 &anx6345_connector_helper_funcs);
562
563 err = drm_connector_register(&anx6345->connector);
564 if (err) {
565 DRM_ERROR("Failed to register connector: %d\n", err);
566 return err;
567 }
568
569 anx6345->connector.polled = DRM_CONNECTOR_POLL_HPD;
570
571 err = drm_connector_attach_encoder(&anx6345->connector,
572 bridge->encoder);
573 if (err) {
574 DRM_ERROR("Failed to link up connector to encoder: %d\n", err);
575 return err;
576 }
577
578 if (anx6345->panel) {
579 err = drm_panel_attach(anx6345->panel, &anx6345->connector);
580 if (err) {
581 DRM_ERROR("Failed to attach panel: %d\n", err);
582 return err;
583 }
584 }
585
586 return 0;
587}
588
589static enum drm_mode_status
590anx6345_bridge_mode_valid(struct drm_bridge *bridge,
591 const struct drm_display_info *info,
592 const struct drm_display_mode *mode)
593{
594 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
595 return MODE_NO_INTERLACE;
596
597 /* Max 1200p at 5.4 Ghz, one lane */
598 if (mode->clock > 154000)
599 return MODE_CLOCK_HIGH;
600
601 return MODE_OK;
602}
603
604static void anx6345_bridge_disable(struct drm_bridge *bridge)
605{
606 struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
607
608 /* Power off all modules except configuration registers access */
609 anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
610 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
611 if (anx6345->panel)
612 drm_panel_disable(anx6345->panel);
613
614 if (anx6345->powered)
615 anx6345_poweroff(anx6345);
616}
617
618static void anx6345_bridge_enable(struct drm_bridge *bridge)
619{
620 struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
621 int err;
622
623 if (anx6345->panel)
624 drm_panel_enable(anx6345->panel);
625
626 err = anx6345_start(anx6345);
627 if (err) {
628 DRM_ERROR("Failed to initialize: %d\n", err);
629 return;
630 }
631
632 err = anx6345_config_dp_output(anx6345);
633 if (err)
634 DRM_ERROR("Failed to enable DP output: %d\n", err);
635}
636
637static const struct drm_bridge_funcs anx6345_bridge_funcs = {
638 .attach = anx6345_bridge_attach,
639 .mode_valid = anx6345_bridge_mode_valid,
640 .disable = anx6345_bridge_disable,
641 .enable = anx6345_bridge_enable,
642};
643
644static void unregister_i2c_dummy_clients(struct anx6345 *anx6345)
645{
646 unsigned int i;
647
648 for (i = 1; i < ARRAY_SIZE(anx6345->i2c_clients); i++)
649 if (anx6345->i2c_clients[i] &&
650 anx6345->i2c_clients[i]->addr != anx6345->client->addr)
651 i2c_unregister_device(anx6345->i2c_clients[i]);
652}
653
654static const struct regmap_config anx6345_regmap_config = {
655 .reg_bits = 8,
656 .val_bits = 8,
657 .max_register = 0xff,
658 .cache_type = REGCACHE_NONE,
659};
660
661static const u16 anx6345_chipid_list[] = {
662 0x6345,
663};
664
665static bool anx6345_get_chip_id(struct anx6345 *anx6345)
666{
667 unsigned int i, idl, idh, version;
668
669 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDL_REG, &idl))
670 return false;
671
672 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDH_REG, &idh))
673 return false;
674
675 anx6345->chipid = (u8)idl | ((u8)idh << 8);
676
677 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_VERSION_REG,
678 &version))
679 return false;
680
681 for (i = 0; i < ARRAY_SIZE(anx6345_chipid_list); i++) {
682 if (anx6345->chipid == anx6345_chipid_list[i]) {
683 DRM_INFO("Found ANX%x (ver. %d) eDP Transmitter\n",
684 anx6345->chipid, version);
685 return true;
686 }
687 }
688
689 DRM_ERROR("ANX%x (ver. %d) not supported by this driver\n",
690 anx6345->chipid, version);
691
692 return false;
693}
694
695static int anx6345_i2c_probe(struct i2c_client *client,
696 const struct i2c_device_id *id)
697{
698 struct anx6345 *anx6345;
699 struct device *dev;
700 int i, err;
701
702 anx6345 = devm_kzalloc(&client->dev, sizeof(*anx6345), GFP_KERNEL);
703 if (!anx6345)
704 return -ENOMEM;
705
706 mutex_init(&anx6345->lock);
707
708 anx6345->bridge.of_node = client->dev.of_node;
709
710 anx6345->client = client;
711 i2c_set_clientdata(client, anx6345);
712
713 dev = &anx6345->client->dev;
714
715 err = drm_of_find_panel_or_bridge(client->dev.of_node, 1, 0,
716 &anx6345->panel, NULL);
717 if (err == -EPROBE_DEFER)
718 return err;
719
720 if (err)
721 DRM_DEBUG("No panel found\n");
722
723 /* 1.2V digital core power regulator */
724 anx6345->dvdd12 = devm_regulator_get(dev, "dvdd12");
725 if (IS_ERR(anx6345->dvdd12)) {
726 if (PTR_ERR(anx6345->dvdd12) != -EPROBE_DEFER)
727 DRM_ERROR("Failed to get dvdd12 supply (%ld)\n",
728 PTR_ERR(anx6345->dvdd12));
729 return PTR_ERR(anx6345->dvdd12);
730 }
731
732 /* 2.5V digital core power regulator */
733 anx6345->dvdd25 = devm_regulator_get(dev, "dvdd25");
734 if (IS_ERR(anx6345->dvdd25)) {
735 if (PTR_ERR(anx6345->dvdd25) != -EPROBE_DEFER)
736 DRM_ERROR("Failed to get dvdd25 supply (%ld)\n",
737 PTR_ERR(anx6345->dvdd25));
738 return PTR_ERR(anx6345->dvdd25);
739 }
740
741 /* GPIO for chip reset */
742 anx6345->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
743 if (IS_ERR(anx6345->gpiod_reset)) {
744 DRM_ERROR("Reset gpio not found\n");
745 return PTR_ERR(anx6345->gpiod_reset);
746 }
747
748 /* Map slave addresses of ANX6345 */
749 for (i = 0; i < I2C_NUM_ADDRESSES; i++) {
750 if (anx6345_i2c_addresses[i] >> 1 != client->addr)
751 anx6345->i2c_clients[i] = i2c_new_dummy_device(client->adapter,
752 anx6345_i2c_addresses[i] >> 1);
753 else
754 anx6345->i2c_clients[i] = client;
755
756 if (IS_ERR(anx6345->i2c_clients[i])) {
757 err = PTR_ERR(anx6345->i2c_clients[i]);
758 DRM_ERROR("Failed to reserve I2C bus %02x\n",
759 anx6345_i2c_addresses[i]);
760 goto err_unregister_i2c;
761 }
762
763 anx6345->map[i] = devm_regmap_init_i2c(anx6345->i2c_clients[i],
764 &anx6345_regmap_config);
765 if (IS_ERR(anx6345->map[i])) {
766 err = PTR_ERR(anx6345->map[i]);
767 DRM_ERROR("Failed regmap initialization %02x\n",
768 anx6345_i2c_addresses[i]);
769 goto err_unregister_i2c;
770 }
771 }
772
773 /* Look for supported chip ID */
774 anx6345_poweron(anx6345);
775 if (anx6345_get_chip_id(anx6345)) {
776 anx6345->bridge.funcs = &anx6345_bridge_funcs;
777 drm_bridge_add(&anx6345->bridge);
778
779 return 0;
780 } else {
781 anx6345_poweroff(anx6345);
782 err = -ENODEV;
783 }
784
785err_unregister_i2c:
786 unregister_i2c_dummy_clients(anx6345);
787 return err;
788}
789
790static int anx6345_i2c_remove(struct i2c_client *client)
791{
792 struct anx6345 *anx6345 = i2c_get_clientdata(client);
793
794 drm_bridge_remove(&anx6345->bridge);
795
796 unregister_i2c_dummy_clients(anx6345);
797
798 kfree(anx6345->edid);
799
800 mutex_destroy(&anx6345->lock);
801
802 return 0;
803}
804
805static const struct i2c_device_id anx6345_id[] = {
806 { "anx6345", 0 },
807 { /* sentinel */ }
808};
809MODULE_DEVICE_TABLE(i2c, anx6345_id);
810
811static const struct of_device_id anx6345_match_table[] = {
812 { .compatible = "analogix,anx6345", },
813 { /* sentinel */ },
814};
815MODULE_DEVICE_TABLE(of, anx6345_match_table);
816
817static struct i2c_driver anx6345_driver = {
818 .driver = {
819 .name = "anx6345",
820 .of_match_table = of_match_ptr(anx6345_match_table),
821 },
822 .probe = anx6345_i2c_probe,
823 .remove = anx6345_i2c_remove,
824 .id_table = anx6345_id,
825};
826module_i2c_driver(anx6345_driver);
827
828MODULE_DESCRIPTION("ANX6345 eDP Transmitter driver");
829MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");
830MODULE_LICENSE("GPL v2");