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
41 static 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
47 struct 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
connector_to_anx6345(struct drm_connector * c)69 static inline struct anx6345 *connector_to_anx6345(struct drm_connector *c)
70 {
71 return container_of(c, struct anx6345, connector);
72 }
73
bridge_to_anx6345(struct drm_bridge * bridge)74 static inline struct anx6345 *bridge_to_anx6345(struct drm_bridge *bridge)
75 {
76 return container_of(bridge, struct anx6345, bridge);
77 }
78
anx6345_set_bits(struct regmap * map,u8 reg,u8 mask)79 static int anx6345_set_bits(struct regmap *map, u8 reg, u8 mask)
80 {
81 return regmap_update_bits(map, reg, mask, mask);
82 }
83
anx6345_clear_bits(struct regmap * map,u8 reg,u8 mask)84 static int anx6345_clear_bits(struct regmap *map, u8 reg, u8 mask)
85 {
86 return regmap_update_bits(map, reg, mask, 0);
87 }
88
anx6345_aux_transfer(struct drm_dp_aux * aux,struct drm_dp_aux_msg * msg)89 static 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
anx6345_dp_link_training(struct anx6345 * anx6345)97 static 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
anx6345_tx_initialization(struct anx6345 * anx6345)249 static 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
anx6345_poweron(struct anx6345 * anx6345)304 static 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
anx6345_poweroff(struct anx6345 * anx6345)348 static 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
anx6345_start(struct anx6345 * anx6345)379 static 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
anx6345_config_dp_output(struct anx6345 * anx6345)414 static 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
anx6345_get_downstream_info(struct anx6345 * anx6345)435 static 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
anx6345_get_modes(struct drm_connector * connector)454 static 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
491 unlock:
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
503 static const struct drm_connector_helper_funcs anx6345_connector_helper_funcs = {
504 .get_modes = anx6345_get_modes,
505 };
506
507 static void
anx6345_connector_destroy(struct drm_connector * connector)508 anx6345_connector_destroy(struct drm_connector *connector)
509 {
510 drm_connector_cleanup(connector);
511 }
512
513 static const struct drm_connector_funcs anx6345_connector_funcs = {
514 .fill_modes = drm_helper_probe_single_connector_modes,
515 .destroy = anx6345_connector_destroy,
516 .reset = drm_atomic_helper_connector_reset,
517 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
518 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
519 };
520
anx6345_bridge_attach(struct drm_bridge * bridge,enum drm_bridge_attach_flags flags)521 static int anx6345_bridge_attach(struct drm_bridge *bridge,
522 enum drm_bridge_attach_flags flags)
523 {
524 struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
525 int err;
526
527 if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
528 DRM_ERROR("Fix bridge driver to make connector optional!");
529 return -EINVAL;
530 }
531
532 if (!bridge->encoder) {
533 DRM_ERROR("Parent encoder object not found");
534 return -ENODEV;
535 }
536
537 /* Register aux channel */
538 anx6345->aux.name = "DP-AUX";
539 anx6345->aux.dev = &anx6345->client->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 return err;
554 }
555
556 drm_connector_helper_add(&anx6345->connector,
557 &anx6345_connector_helper_funcs);
558
559 err = drm_connector_register(&anx6345->connector);
560 if (err) {
561 DRM_ERROR("Failed to register connector: %d\n", err);
562 return err;
563 }
564
565 anx6345->connector.polled = DRM_CONNECTOR_POLL_HPD;
566
567 err = drm_connector_attach_encoder(&anx6345->connector,
568 bridge->encoder);
569 if (err) {
570 DRM_ERROR("Failed to link up connector to encoder: %d\n", err);
571 return err;
572 }
573
574 return 0;
575 }
576
577 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)578 anx6345_bridge_mode_valid(struct drm_bridge *bridge,
579 const struct drm_display_info *info,
580 const struct drm_display_mode *mode)
581 {
582 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
583 return MODE_NO_INTERLACE;
584
585 /* Max 1200p at 5.4 Ghz, one lane */
586 if (mode->clock > 154000)
587 return MODE_CLOCK_HIGH;
588
589 return MODE_OK;
590 }
591
anx6345_bridge_disable(struct drm_bridge * bridge)592 static void anx6345_bridge_disable(struct drm_bridge *bridge)
593 {
594 struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
595
596 /* Power off all modules except configuration registers access */
597 anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
598 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
599 if (anx6345->panel)
600 drm_panel_disable(anx6345->panel);
601
602 if (anx6345->powered)
603 anx6345_poweroff(anx6345);
604 }
605
anx6345_bridge_enable(struct drm_bridge * bridge)606 static void anx6345_bridge_enable(struct drm_bridge *bridge)
607 {
608 struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
609 int err;
610
611 if (anx6345->panel)
612 drm_panel_enable(anx6345->panel);
613
614 err = anx6345_start(anx6345);
615 if (err) {
616 DRM_ERROR("Failed to initialize: %d\n", err);
617 return;
618 }
619
620 err = anx6345_config_dp_output(anx6345);
621 if (err)
622 DRM_ERROR("Failed to enable DP output: %d\n", err);
623 }
624
625 static const struct drm_bridge_funcs anx6345_bridge_funcs = {
626 .attach = anx6345_bridge_attach,
627 .mode_valid = anx6345_bridge_mode_valid,
628 .disable = anx6345_bridge_disable,
629 .enable = anx6345_bridge_enable,
630 };
631
unregister_i2c_dummy_clients(struct anx6345 * anx6345)632 static void unregister_i2c_dummy_clients(struct anx6345 *anx6345)
633 {
634 unsigned int i;
635
636 for (i = 1; i < ARRAY_SIZE(anx6345->i2c_clients); i++)
637 if (anx6345->i2c_clients[i] &&
638 anx6345->i2c_clients[i]->addr != anx6345->client->addr)
639 i2c_unregister_device(anx6345->i2c_clients[i]);
640 }
641
642 static const struct regmap_config anx6345_regmap_config = {
643 .reg_bits = 8,
644 .val_bits = 8,
645 .max_register = 0xff,
646 .cache_type = REGCACHE_NONE,
647 };
648
649 static const u16 anx6345_chipid_list[] = {
650 0x6345,
651 };
652
anx6345_get_chip_id(struct anx6345 * anx6345)653 static bool anx6345_get_chip_id(struct anx6345 *anx6345)
654 {
655 unsigned int i, idl, idh, version;
656
657 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDL_REG, &idl))
658 return false;
659
660 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDH_REG, &idh))
661 return false;
662
663 anx6345->chipid = (u8)idl | ((u8)idh << 8);
664
665 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_VERSION_REG,
666 &version))
667 return false;
668
669 for (i = 0; i < ARRAY_SIZE(anx6345_chipid_list); i++) {
670 if (anx6345->chipid == anx6345_chipid_list[i]) {
671 DRM_INFO("Found ANX%x (ver. %d) eDP Transmitter\n",
672 anx6345->chipid, version);
673 return true;
674 }
675 }
676
677 DRM_ERROR("ANX%x (ver. %d) not supported by this driver\n",
678 anx6345->chipid, version);
679
680 return false;
681 }
682
anx6345_i2c_probe(struct i2c_client * client,const struct i2c_device_id * id)683 static int anx6345_i2c_probe(struct i2c_client *client,
684 const struct i2c_device_id *id)
685 {
686 struct anx6345 *anx6345;
687 struct device *dev;
688 int i, err;
689
690 anx6345 = devm_kzalloc(&client->dev, sizeof(*anx6345), GFP_KERNEL);
691 if (!anx6345)
692 return -ENOMEM;
693
694 mutex_init(&anx6345->lock);
695
696 anx6345->bridge.of_node = client->dev.of_node;
697
698 anx6345->client = client;
699 i2c_set_clientdata(client, anx6345);
700
701 dev = &anx6345->client->dev;
702
703 err = drm_of_find_panel_or_bridge(client->dev.of_node, 1, 0,
704 &anx6345->panel, NULL);
705 if (err == -EPROBE_DEFER)
706 return err;
707
708 if (err)
709 DRM_DEBUG("No panel found\n");
710
711 /* 1.2V digital core power regulator */
712 anx6345->dvdd12 = devm_regulator_get(dev, "dvdd12");
713 if (IS_ERR(anx6345->dvdd12)) {
714 if (PTR_ERR(anx6345->dvdd12) != -EPROBE_DEFER)
715 DRM_ERROR("Failed to get dvdd12 supply (%ld)\n",
716 PTR_ERR(anx6345->dvdd12));
717 return PTR_ERR(anx6345->dvdd12);
718 }
719
720 /* 2.5V digital core power regulator */
721 anx6345->dvdd25 = devm_regulator_get(dev, "dvdd25");
722 if (IS_ERR(anx6345->dvdd25)) {
723 if (PTR_ERR(anx6345->dvdd25) != -EPROBE_DEFER)
724 DRM_ERROR("Failed to get dvdd25 supply (%ld)\n",
725 PTR_ERR(anx6345->dvdd25));
726 return PTR_ERR(anx6345->dvdd25);
727 }
728
729 /* GPIO for chip reset */
730 anx6345->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
731 if (IS_ERR(anx6345->gpiod_reset)) {
732 DRM_ERROR("Reset gpio not found\n");
733 return PTR_ERR(anx6345->gpiod_reset);
734 }
735
736 /* Map slave addresses of ANX6345 */
737 for (i = 0; i < I2C_NUM_ADDRESSES; i++) {
738 if (anx6345_i2c_addresses[i] >> 1 != client->addr)
739 anx6345->i2c_clients[i] = i2c_new_dummy_device(client->adapter,
740 anx6345_i2c_addresses[i] >> 1);
741 else
742 anx6345->i2c_clients[i] = client;
743
744 if (IS_ERR(anx6345->i2c_clients[i])) {
745 err = PTR_ERR(anx6345->i2c_clients[i]);
746 DRM_ERROR("Failed to reserve I2C bus %02x\n",
747 anx6345_i2c_addresses[i]);
748 goto err_unregister_i2c;
749 }
750
751 anx6345->map[i] = devm_regmap_init_i2c(anx6345->i2c_clients[i],
752 &anx6345_regmap_config);
753 if (IS_ERR(anx6345->map[i])) {
754 err = PTR_ERR(anx6345->map[i]);
755 DRM_ERROR("Failed regmap initialization %02x\n",
756 anx6345_i2c_addresses[i]);
757 goto err_unregister_i2c;
758 }
759 }
760
761 /* Look for supported chip ID */
762 anx6345_poweron(anx6345);
763 if (anx6345_get_chip_id(anx6345)) {
764 anx6345->bridge.funcs = &anx6345_bridge_funcs;
765 drm_bridge_add(&anx6345->bridge);
766
767 return 0;
768 } else {
769 anx6345_poweroff(anx6345);
770 err = -ENODEV;
771 }
772
773 err_unregister_i2c:
774 unregister_i2c_dummy_clients(anx6345);
775 return err;
776 }
777
anx6345_i2c_remove(struct i2c_client * client)778 static int anx6345_i2c_remove(struct i2c_client *client)
779 {
780 struct anx6345 *anx6345 = i2c_get_clientdata(client);
781
782 drm_bridge_remove(&anx6345->bridge);
783
784 unregister_i2c_dummy_clients(anx6345);
785
786 kfree(anx6345->edid);
787
788 mutex_destroy(&anx6345->lock);
789
790 return 0;
791 }
792
793 static const struct i2c_device_id anx6345_id[] = {
794 { "anx6345", 0 },
795 { /* sentinel */ }
796 };
797 MODULE_DEVICE_TABLE(i2c, anx6345_id);
798
799 static const struct of_device_id anx6345_match_table[] = {
800 { .compatible = "analogix,anx6345", },
801 { /* sentinel */ },
802 };
803 MODULE_DEVICE_TABLE(of, anx6345_match_table);
804
805 static struct i2c_driver anx6345_driver = {
806 .driver = {
807 .name = "anx6345",
808 .of_match_table = of_match_ptr(anx6345_match_table),
809 },
810 .probe = anx6345_i2c_probe,
811 .remove = anx6345_i2c_remove,
812 .id_table = anx6345_id,
813 };
814 module_i2c_driver(anx6345_driver);
815
816 MODULE_DESCRIPTION("ANX6345 eDP Transmitter driver");
817 MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");
818 MODULE_LICENSE("GPL v2");
819