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 /*
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
anx6345_tx_initialization(struct anx6345 * anx6345)248 static 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
anx6345_poweron(struct anx6345 * anx6345)303 static 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
anx6345_poweroff(struct anx6345 * anx6345)347 static 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
anx6345_start(struct anx6345 * anx6345)378 static 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
anx6345_config_dp_output(struct anx6345 * anx6345)413 static 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
anx6345_get_downstream_info(struct anx6345 * anx6345)434 static 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
anx6345_get_modes(struct drm_connector * connector)453 static 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->drm_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->drm_edid = drm_edid_read_ddc(connector, &anx6345->aux.ddc);
474 if (!anx6345->drm_edid)
475 DRM_ERROR("Failed to read EDID from panel\n");
476
477 err = drm_edid_connector_update(connector, anx6345->drm_edid);
478 if (err) {
479 DRM_ERROR("Failed to update EDID property: %d\n", err);
480 goto unlock;
481 }
482 }
483
484 num_modes += drm_edid_connector_add_modes(connector);
485
486 /* Driver currently supports only 6bpc */
487 connector->display_info.bpc = 6;
488
489 unlock:
490 if (power_off)
491 anx6345_poweroff(anx6345);
492
493 mutex_unlock(&anx6345->lock);
494
495 if (!num_modes && anx6345->panel)
496 num_modes += drm_panel_get_modes(anx6345->panel, connector);
497
498 return num_modes;
499 }
500
501 static const struct drm_connector_helper_funcs anx6345_connector_helper_funcs = {
502 .get_modes = anx6345_get_modes,
503 };
504
505 static void
anx6345_connector_destroy(struct drm_connector * connector)506 anx6345_connector_destroy(struct drm_connector *connector)
507 {
508 drm_connector_cleanup(connector);
509 }
510
511 static const struct drm_connector_funcs anx6345_connector_funcs = {
512 .fill_modes = drm_helper_probe_single_connector_modes,
513 .destroy = anx6345_connector_destroy,
514 .reset = drm_atomic_helper_connector_reset,
515 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
516 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
517 };
518
anx6345_bridge_attach(struct drm_bridge * bridge,enum drm_bridge_attach_flags flags)519 static int anx6345_bridge_attach(struct drm_bridge *bridge,
520 enum drm_bridge_attach_flags flags)
521 {
522 struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
523 int err;
524
525 if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
526 DRM_ERROR("Fix bridge driver to make connector optional!");
527 return -EINVAL;
528 }
529
530 /* Register aux channel */
531 anx6345->aux.name = "DP-AUX";
532 anx6345->aux.dev = &anx6345->client->dev;
533 anx6345->aux.drm_dev = bridge->dev;
534 anx6345->aux.transfer = anx6345_aux_transfer;
535
536 err = drm_dp_aux_register(&anx6345->aux);
537 if (err < 0) {
538 DRM_ERROR("Failed to register aux channel: %d\n", err);
539 return err;
540 }
541
542 err = drm_connector_init(bridge->dev, &anx6345->connector,
543 &anx6345_connector_funcs,
544 DRM_MODE_CONNECTOR_eDP);
545 if (err) {
546 DRM_ERROR("Failed to initialize connector: %d\n", err);
547 goto aux_unregister;
548 }
549
550 drm_connector_helper_add(&anx6345->connector,
551 &anx6345_connector_helper_funcs);
552
553 anx6345->connector.polled = DRM_CONNECTOR_POLL_HPD;
554
555 err = drm_connector_attach_encoder(&anx6345->connector,
556 bridge->encoder);
557 if (err) {
558 DRM_ERROR("Failed to link up connector to encoder: %d\n", err);
559 goto connector_cleanup;
560 }
561
562 err = drm_connector_register(&anx6345->connector);
563 if (err) {
564 DRM_ERROR("Failed to register connector: %d\n", err);
565 goto connector_cleanup;
566 }
567
568 return 0;
569 connector_cleanup:
570 drm_connector_cleanup(&anx6345->connector);
571 aux_unregister:
572 drm_dp_aux_unregister(&anx6345->aux);
573 return err;
574 }
575
anx6345_bridge_detach(struct drm_bridge * bridge)576 static void anx6345_bridge_detach(struct drm_bridge *bridge)
577 {
578 drm_dp_aux_unregister(&bridge_to_anx6345(bridge)->aux);
579 }
580
581 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)582 anx6345_bridge_mode_valid(struct drm_bridge *bridge,
583 const struct drm_display_info *info,
584 const struct drm_display_mode *mode)
585 {
586 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
587 return MODE_NO_INTERLACE;
588
589 /* Max 1200p at 5.4 Ghz, one lane */
590 if (mode->clock > 154000)
591 return MODE_CLOCK_HIGH;
592
593 return MODE_OK;
594 }
595
anx6345_bridge_disable(struct drm_bridge * bridge)596 static void anx6345_bridge_disable(struct drm_bridge *bridge)
597 {
598 struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
599
600 /* Power off all modules except configuration registers access */
601 anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
602 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
603 if (anx6345->panel)
604 drm_panel_disable(anx6345->panel);
605
606 if (anx6345->powered)
607 anx6345_poweroff(anx6345);
608 }
609
anx6345_bridge_enable(struct drm_bridge * bridge)610 static void anx6345_bridge_enable(struct drm_bridge *bridge)
611 {
612 struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
613 int err;
614
615 if (anx6345->panel)
616 drm_panel_enable(anx6345->panel);
617
618 err = anx6345_start(anx6345);
619 if (err) {
620 DRM_ERROR("Failed to initialize: %d\n", err);
621 return;
622 }
623
624 err = anx6345_config_dp_output(anx6345);
625 if (err)
626 DRM_ERROR("Failed to enable DP output: %d\n", err);
627 }
628
629 static const struct drm_bridge_funcs anx6345_bridge_funcs = {
630 .attach = anx6345_bridge_attach,
631 .detach = anx6345_bridge_detach,
632 .mode_valid = anx6345_bridge_mode_valid,
633 .disable = anx6345_bridge_disable,
634 .enable = anx6345_bridge_enable,
635 };
636
unregister_i2c_dummy_clients(struct anx6345 * anx6345)637 static void unregister_i2c_dummy_clients(struct anx6345 *anx6345)
638 {
639 unsigned int i;
640
641 for (i = 1; i < ARRAY_SIZE(anx6345->i2c_clients); i++)
642 if (anx6345->i2c_clients[i] &&
643 anx6345->i2c_clients[i]->addr != anx6345->client->addr)
644 i2c_unregister_device(anx6345->i2c_clients[i]);
645 }
646
647 static const struct regmap_config anx6345_regmap_config = {
648 .reg_bits = 8,
649 .val_bits = 8,
650 .max_register = 0xff,
651 .cache_type = REGCACHE_NONE,
652 };
653
654 static const u16 anx6345_chipid_list[] = {
655 0x6345,
656 };
657
anx6345_get_chip_id(struct anx6345 * anx6345)658 static bool anx6345_get_chip_id(struct anx6345 *anx6345)
659 {
660 unsigned int i, idl, idh, version;
661
662 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDL_REG, &idl))
663 return false;
664
665 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDH_REG, &idh))
666 return false;
667
668 anx6345->chipid = (u8)idl | ((u8)idh << 8);
669
670 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_VERSION_REG,
671 &version))
672 return false;
673
674 for (i = 0; i < ARRAY_SIZE(anx6345_chipid_list); i++) {
675 if (anx6345->chipid == anx6345_chipid_list[i]) {
676 DRM_INFO("Found ANX%x (ver. %d) eDP Transmitter\n",
677 anx6345->chipid, version);
678 return true;
679 }
680 }
681
682 DRM_ERROR("ANX%x (ver. %d) not supported by this driver\n",
683 anx6345->chipid, version);
684
685 return false;
686 }
687
anx6345_i2c_probe(struct i2c_client * client)688 static int anx6345_i2c_probe(struct i2c_client *client)
689 {
690 struct anx6345 *anx6345;
691 struct device *dev;
692 int i, err;
693
694 anx6345 = devm_kzalloc(&client->dev, sizeof(*anx6345), GFP_KERNEL);
695 if (!anx6345)
696 return -ENOMEM;
697
698 mutex_init(&anx6345->lock);
699
700 anx6345->bridge.of_node = client->dev.of_node;
701
702 anx6345->client = client;
703 i2c_set_clientdata(client, anx6345);
704
705 dev = &anx6345->client->dev;
706
707 err = drm_of_find_panel_or_bridge(client->dev.of_node, 1, 0,
708 &anx6345->panel, NULL);
709 if (err == -EPROBE_DEFER)
710 return err;
711
712 if (err)
713 DRM_DEBUG("No panel found\n");
714
715 /* 1.2V digital core power regulator */
716 anx6345->dvdd12 = devm_regulator_get(dev, "dvdd12");
717 if (IS_ERR(anx6345->dvdd12)) {
718 if (PTR_ERR(anx6345->dvdd12) != -EPROBE_DEFER)
719 DRM_ERROR("Failed to get dvdd12 supply (%ld)\n",
720 PTR_ERR(anx6345->dvdd12));
721 return PTR_ERR(anx6345->dvdd12);
722 }
723
724 /* 2.5V digital core power regulator */
725 anx6345->dvdd25 = devm_regulator_get(dev, "dvdd25");
726 if (IS_ERR(anx6345->dvdd25)) {
727 if (PTR_ERR(anx6345->dvdd25) != -EPROBE_DEFER)
728 DRM_ERROR("Failed to get dvdd25 supply (%ld)\n",
729 PTR_ERR(anx6345->dvdd25));
730 return PTR_ERR(anx6345->dvdd25);
731 }
732
733 /* GPIO for chip reset */
734 anx6345->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
735 if (IS_ERR(anx6345->gpiod_reset)) {
736 DRM_ERROR("Reset gpio not found\n");
737 return PTR_ERR(anx6345->gpiod_reset);
738 }
739
740 /* Map slave addresses of ANX6345 */
741 for (i = 0; i < I2C_NUM_ADDRESSES; i++) {
742 if (anx6345_i2c_addresses[i] >> 1 != client->addr)
743 anx6345->i2c_clients[i] = i2c_new_dummy_device(client->adapter,
744 anx6345_i2c_addresses[i] >> 1);
745 else
746 anx6345->i2c_clients[i] = client;
747
748 if (IS_ERR(anx6345->i2c_clients[i])) {
749 err = PTR_ERR(anx6345->i2c_clients[i]);
750 DRM_ERROR("Failed to reserve I2C bus %02x\n",
751 anx6345_i2c_addresses[i]);
752 goto err_unregister_i2c;
753 }
754
755 anx6345->map[i] = devm_regmap_init_i2c(anx6345->i2c_clients[i],
756 &anx6345_regmap_config);
757 if (IS_ERR(anx6345->map[i])) {
758 err = PTR_ERR(anx6345->map[i]);
759 DRM_ERROR("Failed regmap initialization %02x\n",
760 anx6345_i2c_addresses[i]);
761 goto err_unregister_i2c;
762 }
763 }
764
765 /* Look for supported chip ID */
766 anx6345_poweron(anx6345);
767 if (anx6345_get_chip_id(anx6345)) {
768 anx6345->bridge.funcs = &anx6345_bridge_funcs;
769 drm_bridge_add(&anx6345->bridge);
770
771 return 0;
772 } else {
773 anx6345_poweroff(anx6345);
774 err = -ENODEV;
775 }
776
777 err_unregister_i2c:
778 unregister_i2c_dummy_clients(anx6345);
779 return err;
780 }
781
anx6345_i2c_remove(struct i2c_client * client)782 static void anx6345_i2c_remove(struct i2c_client *client)
783 {
784 struct anx6345 *anx6345 = i2c_get_clientdata(client);
785
786 drm_bridge_remove(&anx6345->bridge);
787
788 unregister_i2c_dummy_clients(anx6345);
789
790 drm_edid_free(anx6345->drm_edid);
791
792 mutex_destroy(&anx6345->lock);
793 }
794
795 static const struct i2c_device_id anx6345_id[] = {
796 { "anx6345", 0 },
797 { /* sentinel */ }
798 };
799 MODULE_DEVICE_TABLE(i2c, anx6345_id);
800
801 static const struct of_device_id anx6345_match_table[] = {
802 { .compatible = "analogix,anx6345", },
803 { /* sentinel */ },
804 };
805 MODULE_DEVICE_TABLE(of, anx6345_match_table);
806
807 static struct i2c_driver anx6345_driver = {
808 .driver = {
809 .name = "anx6345",
810 .of_match_table = anx6345_match_table,
811 },
812 .probe = anx6345_i2c_probe,
813 .remove = anx6345_i2c_remove,
814 .id_table = anx6345_id,
815 };
816 module_i2c_driver(anx6345_driver);
817
818 MODULE_DESCRIPTION("ANX6345 eDP Transmitter driver");
819 MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");
820 MODULE_LICENSE("GPL v2");
821