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
40 static 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
46 struct 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
connector_to_anx6345(struct drm_connector * c)68 static inline struct anx6345 *connector_to_anx6345(struct drm_connector *c)
69 {
70 return container_of(c, struct anx6345, connector);
71 }
72
bridge_to_anx6345(struct drm_bridge * bridge)73 static inline struct anx6345 *bridge_to_anx6345(struct drm_bridge *bridge)
74 {
75 return container_of(bridge, struct anx6345, bridge);
76 }
77
anx6345_set_bits(struct regmap * map,u8 reg,u8 mask)78 static int anx6345_set_bits(struct regmap *map, u8 reg, u8 mask)
79 {
80 return regmap_update_bits(map, reg, mask, mask);
81 }
82
anx6345_clear_bits(struct regmap * map,u8 reg,u8 mask)83 static int anx6345_clear_bits(struct regmap *map, u8 reg, u8 mask)
84 {
85 return regmap_update_bits(map, reg, mask, 0);
86 }
87
anx6345_aux_transfer(struct drm_dp_aux * aux,struct drm_dp_aux_msg * msg)88 static 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
anx6345_dp_link_training(struct anx6345 * anx6345)96 static 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
anx6345_tx_initialization(struct anx6345 * anx6345)220 static 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
anx6345_poweron(struct anx6345 * anx6345)275 static 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
anx6345_poweroff(struct anx6345 * anx6345)319 static 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
anx6345_start(struct anx6345 * anx6345)350 static 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
anx6345_config_dp_output(struct anx6345 * anx6345)385 static 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
anx6345_get_downstream_info(struct anx6345 * anx6345)406 static 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
anx6345_get_modes(struct drm_connector * connector)425 static 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
461 unlock:
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
473 static const struct drm_connector_helper_funcs anx6345_connector_helper_funcs = {
474 .get_modes = anx6345_get_modes,
475 };
476
477 static void
anx6345_connector_destroy(struct drm_connector * connector)478 anx6345_connector_destroy(struct drm_connector *connector)
479 {
480 drm_connector_cleanup(connector);
481 }
482
483 static 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
anx6345_bridge_attach(struct drm_bridge * bridge,struct drm_encoder * encoder,enum drm_bridge_attach_flags flags)491 static 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;
542 connector_cleanup:
543 drm_connector_cleanup(&anx6345->connector);
544 aux_unregister:
545 drm_dp_aux_unregister(&anx6345->aux);
546 return err;
547 }
548
anx6345_bridge_detach(struct drm_bridge * bridge)549 static void anx6345_bridge_detach(struct drm_bridge *bridge)
550 {
551 drm_dp_aux_unregister(&bridge_to_anx6345(bridge)->aux);
552 }
553
554 static enum drm_mode_status
anx6345_bridge_mode_valid(struct drm_bridge * bridge,const struct drm_display_info * info,const struct drm_display_mode * mode)555 anx6345_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
anx6345_bridge_disable(struct drm_bridge * bridge)569 static 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
anx6345_bridge_enable(struct drm_bridge * bridge)583 static 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
602 static 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
unregister_i2c_dummy_clients(struct anx6345 * anx6345)610 static 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
620 static 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
627 static const u16 anx6345_chipid_list[] = {
628 0x6345,
629 };
630
anx6345_get_chip_id(struct anx6345 * anx6345)631 static 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
anx6345_i2c_probe(struct i2c_client * client)661 static 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
750 err_unregister_i2c:
751 unregister_i2c_dummy_clients(anx6345);
752 return err;
753 }
754
anx6345_i2c_remove(struct i2c_client * client)755 static 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
768 static const struct i2c_device_id anx6345_id[] = {
769 { "anx6345" },
770 { /* sentinel */ }
771 };
772 MODULE_DEVICE_TABLE(i2c, anx6345_id);
773
774 static const struct of_device_id anx6345_match_table[] = {
775 { .compatible = "analogix,anx6345", },
776 { /* sentinel */ },
777 };
778 MODULE_DEVICE_TABLE(of, anx6345_match_table);
779
780 static 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 };
789 module_i2c_driver(anx6345_driver);
790
791 MODULE_DESCRIPTION("ANX6345 eDP Transmitter driver");
792 MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");
793 MODULE_LICENSE("GPL v2");
794