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[mirror_ubuntu-jammy-kernel.git] / drivers / gpu / drm / bridge / analogix / analogix_dp_core.c
1 /*
2 * Analogix DP (Display Port) core interface driver.
3 *
4 * Copyright (C) 2012 Samsung Electronics Co., Ltd.
5 * Author: Jingoo Han <jg1.han@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 */
12
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/err.h>
16 #include <linux/clk.h>
17 #include <linux/io.h>
18 #include <linux/interrupt.h>
19 #include <linux/of.h>
20 #include <linux/of_gpio.h>
21 #include <linux/gpio.h>
22 #include <linux/component.h>
23 #include <linux/phy/phy.h>
24
25 #include <drm/drmP.h>
26 #include <drm/drm_atomic_helper.h>
27 #include <drm/drm_crtc.h>
28 #include <drm/drm_crtc_helper.h>
29 #include <drm/drm_panel.h>
30
31 #include <drm/bridge/analogix_dp.h>
32
33 #include "analogix_dp_core.h"
34 #include "analogix_dp_reg.h"
35
36 #define to_dp(nm) container_of(nm, struct analogix_dp_device, nm)
37
38 struct bridge_init {
39 struct i2c_client *client;
40 struct device_node *node;
41 };
42
43 static void analogix_dp_init_dp(struct analogix_dp_device *dp)
44 {
45 analogix_dp_reset(dp);
46
47 analogix_dp_swreset(dp);
48
49 analogix_dp_init_analog_param(dp);
50 analogix_dp_init_interrupt(dp);
51
52 /* SW defined function Normal operation */
53 analogix_dp_enable_sw_function(dp);
54
55 analogix_dp_config_interrupt(dp);
56 analogix_dp_init_analog_func(dp);
57
58 analogix_dp_init_hpd(dp);
59 analogix_dp_init_aux(dp);
60 }
61
62 static int analogix_dp_detect_hpd(struct analogix_dp_device *dp)
63 {
64 int timeout_loop = 0;
65
66 while (timeout_loop < DP_TIMEOUT_LOOP_COUNT) {
67 if (analogix_dp_get_plug_in_status(dp) == 0)
68 return 0;
69
70 timeout_loop++;
71 usleep_range(10, 11);
72 }
73
74 /*
75 * Some edp screen do not have hpd signal, so we can't just
76 * return failed when hpd plug in detect failed, DT property
77 * "force-hpd" would indicate whether driver need this.
78 */
79 if (!dp->force_hpd)
80 return -ETIMEDOUT;
81
82 /*
83 * The eDP TRM indicate that if HPD_STATUS(RO) is 0, AUX CH
84 * will not work, so we need to give a force hpd action to
85 * set HPD_STATUS manually.
86 */
87 dev_dbg(dp->dev, "failed to get hpd plug status, try to force hpd\n");
88
89 analogix_dp_force_hpd(dp);
90
91 if (analogix_dp_get_plug_in_status(dp) != 0) {
92 dev_err(dp->dev, "failed to get hpd plug in status\n");
93 return -EINVAL;
94 }
95
96 dev_dbg(dp->dev, "success to get plug in status after force hpd\n");
97
98 return 0;
99 }
100
101 int analogix_dp_psr_supported(struct device *dev)
102 {
103 struct analogix_dp_device *dp = dev_get_drvdata(dev);
104
105 return dp->psr_support;
106 }
107 EXPORT_SYMBOL_GPL(analogix_dp_psr_supported);
108
109 int analogix_dp_enable_psr(struct device *dev)
110 {
111 struct analogix_dp_device *dp = dev_get_drvdata(dev);
112 struct edp_vsc_psr psr_vsc;
113
114 if (!dp->psr_support)
115 return 0;
116
117 /* Prepare VSC packet as per EDP 1.4 spec, Table 6.9 */
118 memset(&psr_vsc, 0, sizeof(psr_vsc));
119 psr_vsc.sdp_header.HB0 = 0;
120 psr_vsc.sdp_header.HB1 = 0x7;
121 psr_vsc.sdp_header.HB2 = 0x2;
122 psr_vsc.sdp_header.HB3 = 0x8;
123
124 psr_vsc.DB0 = 0;
125 psr_vsc.DB1 = EDP_VSC_PSR_STATE_ACTIVE | EDP_VSC_PSR_CRC_VALUES_VALID;
126
127 analogix_dp_send_psr_spd(dp, &psr_vsc);
128 return 0;
129 }
130 EXPORT_SYMBOL_GPL(analogix_dp_enable_psr);
131
132 int analogix_dp_disable_psr(struct device *dev)
133 {
134 struct analogix_dp_device *dp = dev_get_drvdata(dev);
135 struct edp_vsc_psr psr_vsc;
136 int ret;
137
138 if (!dp->psr_support)
139 return 0;
140
141 /* Prepare VSC packet as per EDP 1.4 spec, Table 6.9 */
142 memset(&psr_vsc, 0, sizeof(psr_vsc));
143 psr_vsc.sdp_header.HB0 = 0;
144 psr_vsc.sdp_header.HB1 = 0x7;
145 psr_vsc.sdp_header.HB2 = 0x2;
146 psr_vsc.sdp_header.HB3 = 0x8;
147
148 psr_vsc.DB0 = 0;
149 psr_vsc.DB1 = 0;
150
151 ret = drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
152 if (ret != 1)
153 dev_err(dp->dev, "Failed to set DP Power0 %d\n", ret);
154
155 analogix_dp_send_psr_spd(dp, &psr_vsc);
156 return 0;
157 }
158 EXPORT_SYMBOL_GPL(analogix_dp_disable_psr);
159
160 static bool analogix_dp_detect_sink_psr(struct analogix_dp_device *dp)
161 {
162 unsigned char psr_version;
163
164 drm_dp_dpcd_readb(&dp->aux, DP_PSR_SUPPORT, &psr_version);
165 dev_dbg(dp->dev, "Panel PSR version : %x\n", psr_version);
166
167 return (psr_version & DP_PSR_IS_SUPPORTED) ? true : false;
168 }
169
170 static void analogix_dp_enable_sink_psr(struct analogix_dp_device *dp)
171 {
172 unsigned char psr_en;
173
174 /* Disable psr function */
175 drm_dp_dpcd_readb(&dp->aux, DP_PSR_EN_CFG, &psr_en);
176 psr_en &= ~DP_PSR_ENABLE;
177 drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en);
178
179 /* Main-Link transmitter remains active during PSR active states */
180 psr_en = DP_PSR_MAIN_LINK_ACTIVE | DP_PSR_CRC_VERIFICATION;
181 drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en);
182
183 /* Enable psr function */
184 psr_en = DP_PSR_ENABLE | DP_PSR_MAIN_LINK_ACTIVE |
185 DP_PSR_CRC_VERIFICATION;
186 drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en);
187
188 analogix_dp_enable_psr_crc(dp);
189 }
190
191 static void
192 analogix_dp_enable_rx_to_enhanced_mode(struct analogix_dp_device *dp,
193 bool enable)
194 {
195 u8 data;
196
197 drm_dp_dpcd_readb(&dp->aux, DP_LANE_COUNT_SET, &data);
198
199 if (enable)
200 drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET,
201 DP_LANE_COUNT_ENHANCED_FRAME_EN |
202 DPCD_LANE_COUNT_SET(data));
203 else
204 drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET,
205 DPCD_LANE_COUNT_SET(data));
206 }
207
208 static int analogix_dp_is_enhanced_mode_available(struct analogix_dp_device *dp)
209 {
210 u8 data;
211 int retval;
212
213 drm_dp_dpcd_readb(&dp->aux, DP_MAX_LANE_COUNT, &data);
214 retval = DPCD_ENHANCED_FRAME_CAP(data);
215
216 return retval;
217 }
218
219 static void analogix_dp_set_enhanced_mode(struct analogix_dp_device *dp)
220 {
221 u8 data;
222
223 data = analogix_dp_is_enhanced_mode_available(dp);
224 analogix_dp_enable_rx_to_enhanced_mode(dp, data);
225 analogix_dp_enable_enhanced_mode(dp, data);
226 }
227
228 static void analogix_dp_training_pattern_dis(struct analogix_dp_device *dp)
229 {
230 analogix_dp_set_training_pattern(dp, DP_NONE);
231
232 drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
233 DP_TRAINING_PATTERN_DISABLE);
234 }
235
236 static void
237 analogix_dp_set_lane_lane_pre_emphasis(struct analogix_dp_device *dp,
238 int pre_emphasis, int lane)
239 {
240 switch (lane) {
241 case 0:
242 analogix_dp_set_lane0_pre_emphasis(dp, pre_emphasis);
243 break;
244 case 1:
245 analogix_dp_set_lane1_pre_emphasis(dp, pre_emphasis);
246 break;
247
248 case 2:
249 analogix_dp_set_lane2_pre_emphasis(dp, pre_emphasis);
250 break;
251
252 case 3:
253 analogix_dp_set_lane3_pre_emphasis(dp, pre_emphasis);
254 break;
255 }
256 }
257
258 static int analogix_dp_link_start(struct analogix_dp_device *dp)
259 {
260 u8 buf[4];
261 int lane, lane_count, pll_tries, retval;
262
263 lane_count = dp->link_train.lane_count;
264
265 dp->link_train.lt_state = CLOCK_RECOVERY;
266 dp->link_train.eq_loop = 0;
267
268 for (lane = 0; lane < lane_count; lane++)
269 dp->link_train.cr_loop[lane] = 0;
270
271 /* Set link rate and count as you want to establish*/
272 analogix_dp_set_link_bandwidth(dp, dp->link_train.link_rate);
273 analogix_dp_set_lane_count(dp, dp->link_train.lane_count);
274
275 /* Setup RX configuration */
276 buf[0] = dp->link_train.link_rate;
277 buf[1] = dp->link_train.lane_count;
278 retval = drm_dp_dpcd_write(&dp->aux, DP_LINK_BW_SET, buf, 2);
279 if (retval < 0)
280 return retval;
281
282 /* Set TX pre-emphasis to minimum */
283 for (lane = 0; lane < lane_count; lane++)
284 analogix_dp_set_lane_lane_pre_emphasis(dp,
285 PRE_EMPHASIS_LEVEL_0, lane);
286
287 /* Wait for PLL lock */
288 pll_tries = 0;
289 while (analogix_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) {
290 if (pll_tries == DP_TIMEOUT_LOOP_COUNT) {
291 dev_err(dp->dev, "Wait for PLL lock timed out\n");
292 return -ETIMEDOUT;
293 }
294
295 pll_tries++;
296 usleep_range(90, 120);
297 }
298
299 /* Set training pattern 1 */
300 analogix_dp_set_training_pattern(dp, TRAINING_PTN1);
301
302 /* Set RX training pattern */
303 retval = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
304 DP_LINK_SCRAMBLING_DISABLE |
305 DP_TRAINING_PATTERN_1);
306 if (retval < 0)
307 return retval;
308
309 for (lane = 0; lane < lane_count; lane++)
310 buf[lane] = DP_TRAIN_PRE_EMPH_LEVEL_0 |
311 DP_TRAIN_VOLTAGE_SWING_LEVEL_0;
312
313 retval = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, buf,
314 lane_count);
315 if (retval < 0)
316 return retval;
317
318 return 0;
319 }
320
321 static unsigned char analogix_dp_get_lane_status(u8 link_status[2], int lane)
322 {
323 int shift = (lane & 1) * 4;
324 u8 link_value = link_status[lane >> 1];
325
326 return (link_value >> shift) & 0xf;
327 }
328
329 static int analogix_dp_clock_recovery_ok(u8 link_status[2], int lane_count)
330 {
331 int lane;
332 u8 lane_status;
333
334 for (lane = 0; lane < lane_count; lane++) {
335 lane_status = analogix_dp_get_lane_status(link_status, lane);
336 if ((lane_status & DP_LANE_CR_DONE) == 0)
337 return -EINVAL;
338 }
339 return 0;
340 }
341
342 static int analogix_dp_channel_eq_ok(u8 link_status[2], u8 link_align,
343 int lane_count)
344 {
345 int lane;
346 u8 lane_status;
347
348 if ((link_align & DP_INTERLANE_ALIGN_DONE) == 0)
349 return -EINVAL;
350
351 for (lane = 0; lane < lane_count; lane++) {
352 lane_status = analogix_dp_get_lane_status(link_status, lane);
353 lane_status &= DP_CHANNEL_EQ_BITS;
354 if (lane_status != DP_CHANNEL_EQ_BITS)
355 return -EINVAL;
356 }
357
358 return 0;
359 }
360
361 static unsigned char
362 analogix_dp_get_adjust_request_voltage(u8 adjust_request[2], int lane)
363 {
364 int shift = (lane & 1) * 4;
365 u8 link_value = adjust_request[lane >> 1];
366
367 return (link_value >> shift) & 0x3;
368 }
369
370 static unsigned char analogix_dp_get_adjust_request_pre_emphasis(
371 u8 adjust_request[2],
372 int lane)
373 {
374 int shift = (lane & 1) * 4;
375 u8 link_value = adjust_request[lane >> 1];
376
377 return ((link_value >> shift) & 0xc) >> 2;
378 }
379
380 static void analogix_dp_set_lane_link_training(struct analogix_dp_device *dp,
381 u8 training_lane_set, int lane)
382 {
383 switch (lane) {
384 case 0:
385 analogix_dp_set_lane0_link_training(dp, training_lane_set);
386 break;
387 case 1:
388 analogix_dp_set_lane1_link_training(dp, training_lane_set);
389 break;
390
391 case 2:
392 analogix_dp_set_lane2_link_training(dp, training_lane_set);
393 break;
394
395 case 3:
396 analogix_dp_set_lane3_link_training(dp, training_lane_set);
397 break;
398 }
399 }
400
401 static unsigned int
402 analogix_dp_get_lane_link_training(struct analogix_dp_device *dp,
403 int lane)
404 {
405 u32 reg;
406
407 switch (lane) {
408 case 0:
409 reg = analogix_dp_get_lane0_link_training(dp);
410 break;
411 case 1:
412 reg = analogix_dp_get_lane1_link_training(dp);
413 break;
414 case 2:
415 reg = analogix_dp_get_lane2_link_training(dp);
416 break;
417 case 3:
418 reg = analogix_dp_get_lane3_link_training(dp);
419 break;
420 default:
421 WARN_ON(1);
422 return 0;
423 }
424
425 return reg;
426 }
427
428 static void analogix_dp_reduce_link_rate(struct analogix_dp_device *dp)
429 {
430 analogix_dp_training_pattern_dis(dp);
431 analogix_dp_set_enhanced_mode(dp);
432
433 dp->link_train.lt_state = FAILED;
434 }
435
436 static void analogix_dp_get_adjust_training_lane(struct analogix_dp_device *dp,
437 u8 adjust_request[2])
438 {
439 int lane, lane_count;
440 u8 voltage_swing, pre_emphasis, training_lane;
441
442 lane_count = dp->link_train.lane_count;
443 for (lane = 0; lane < lane_count; lane++) {
444 voltage_swing = analogix_dp_get_adjust_request_voltage(
445 adjust_request, lane);
446 pre_emphasis = analogix_dp_get_adjust_request_pre_emphasis(
447 adjust_request, lane);
448 training_lane = DPCD_VOLTAGE_SWING_SET(voltage_swing) |
449 DPCD_PRE_EMPHASIS_SET(pre_emphasis);
450
451 if (voltage_swing == VOLTAGE_LEVEL_3)
452 training_lane |= DP_TRAIN_MAX_SWING_REACHED;
453 if (pre_emphasis == PRE_EMPHASIS_LEVEL_3)
454 training_lane |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
455
456 dp->link_train.training_lane[lane] = training_lane;
457 }
458 }
459
460 static int analogix_dp_process_clock_recovery(struct analogix_dp_device *dp)
461 {
462 int lane, lane_count, retval;
463 u8 voltage_swing, pre_emphasis, training_lane;
464 u8 link_status[2], adjust_request[2];
465
466 usleep_range(100, 101);
467
468 lane_count = dp->link_train.lane_count;
469
470 retval = drm_dp_dpcd_read(&dp->aux, DP_LANE0_1_STATUS, link_status, 2);
471 if (retval < 0)
472 return retval;
473
474 retval = drm_dp_dpcd_read(&dp->aux, DP_ADJUST_REQUEST_LANE0_1,
475 adjust_request, 2);
476 if (retval < 0)
477 return retval;
478
479 if (analogix_dp_clock_recovery_ok(link_status, lane_count) == 0) {
480 /* set training pattern 2 for EQ */
481 analogix_dp_set_training_pattern(dp, TRAINING_PTN2);
482
483 retval = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
484 DP_LINK_SCRAMBLING_DISABLE |
485 DP_TRAINING_PATTERN_2);
486 if (retval < 0)
487 return retval;
488
489 dev_info(dp->dev, "Link Training Clock Recovery success\n");
490 dp->link_train.lt_state = EQUALIZER_TRAINING;
491 } else {
492 for (lane = 0; lane < lane_count; lane++) {
493 training_lane = analogix_dp_get_lane_link_training(
494 dp, lane);
495 voltage_swing = analogix_dp_get_adjust_request_voltage(
496 adjust_request, lane);
497 pre_emphasis = analogix_dp_get_adjust_request_pre_emphasis(
498 adjust_request, lane);
499
500 if (DPCD_VOLTAGE_SWING_GET(training_lane) ==
501 voltage_swing &&
502 DPCD_PRE_EMPHASIS_GET(training_lane) ==
503 pre_emphasis)
504 dp->link_train.cr_loop[lane]++;
505
506 if (dp->link_train.cr_loop[lane] == MAX_CR_LOOP ||
507 voltage_swing == VOLTAGE_LEVEL_3 ||
508 pre_emphasis == PRE_EMPHASIS_LEVEL_3) {
509 dev_err(dp->dev, "CR Max reached (%d,%d,%d)\n",
510 dp->link_train.cr_loop[lane],
511 voltage_swing, pre_emphasis);
512 analogix_dp_reduce_link_rate(dp);
513 return -EIO;
514 }
515 }
516 }
517
518 analogix_dp_get_adjust_training_lane(dp, adjust_request);
519
520 for (lane = 0; lane < lane_count; lane++)
521 analogix_dp_set_lane_link_training(dp,
522 dp->link_train.training_lane[lane], lane);
523
524 retval = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET,
525 dp->link_train.training_lane, lane_count);
526 if (retval < 0)
527 return retval;
528
529 return 0;
530 }
531
532 static int analogix_dp_process_equalizer_training(struct analogix_dp_device *dp)
533 {
534 int lane, lane_count, retval;
535 u32 reg;
536 u8 link_align, link_status[2], adjust_request[2];
537
538 usleep_range(400, 401);
539
540 lane_count = dp->link_train.lane_count;
541
542 retval = drm_dp_dpcd_read(&dp->aux, DP_LANE0_1_STATUS, link_status, 2);
543 if (retval < 0)
544 return retval;
545
546 if (analogix_dp_clock_recovery_ok(link_status, lane_count)) {
547 analogix_dp_reduce_link_rate(dp);
548 return -EIO;
549 }
550
551 retval = drm_dp_dpcd_read(&dp->aux, DP_ADJUST_REQUEST_LANE0_1,
552 adjust_request, 2);
553 if (retval < 0)
554 return retval;
555
556 retval = drm_dp_dpcd_readb(&dp->aux, DP_LANE_ALIGN_STATUS_UPDATED,
557 &link_align);
558 if (retval < 0)
559 return retval;
560
561 analogix_dp_get_adjust_training_lane(dp, adjust_request);
562
563 if (!analogix_dp_channel_eq_ok(link_status, link_align, lane_count)) {
564 /* traing pattern Set to Normal */
565 analogix_dp_training_pattern_dis(dp);
566
567 dev_info(dp->dev, "Link Training success!\n");
568
569 analogix_dp_get_link_bandwidth(dp, &reg);
570 dp->link_train.link_rate = reg;
571 dev_dbg(dp->dev, "final bandwidth = %.2x\n",
572 dp->link_train.link_rate);
573
574 analogix_dp_get_lane_count(dp, &reg);
575 dp->link_train.lane_count = reg;
576 dev_dbg(dp->dev, "final lane count = %.2x\n",
577 dp->link_train.lane_count);
578
579 /* set enhanced mode if available */
580 analogix_dp_set_enhanced_mode(dp);
581 dp->link_train.lt_state = FINISHED;
582
583 return 0;
584 }
585
586 /* not all locked */
587 dp->link_train.eq_loop++;
588
589 if (dp->link_train.eq_loop > MAX_EQ_LOOP) {
590 dev_err(dp->dev, "EQ Max loop\n");
591 analogix_dp_reduce_link_rate(dp);
592 return -EIO;
593 }
594
595 for (lane = 0; lane < lane_count; lane++)
596 analogix_dp_set_lane_link_training(dp,
597 dp->link_train.training_lane[lane], lane);
598
599 retval = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET,
600 dp->link_train.training_lane, lane_count);
601 if (retval < 0)
602 return retval;
603
604 return 0;
605 }
606
607 static void analogix_dp_get_max_rx_bandwidth(struct analogix_dp_device *dp,
608 u8 *bandwidth)
609 {
610 u8 data;
611
612 /*
613 * For DP rev.1.1, Maximum link rate of Main Link lanes
614 * 0x06 = 1.62 Gbps, 0x0a = 2.7 Gbps
615 * For DP rev.1.2, Maximum link rate of Main Link lanes
616 * 0x06 = 1.62 Gbps, 0x0a = 2.7 Gbps, 0x14 = 5.4Gbps
617 */
618 drm_dp_dpcd_readb(&dp->aux, DP_MAX_LINK_RATE, &data);
619 *bandwidth = data;
620 }
621
622 static void analogix_dp_get_max_rx_lane_count(struct analogix_dp_device *dp,
623 u8 *lane_count)
624 {
625 u8 data;
626
627 /*
628 * For DP rev.1.1, Maximum number of Main Link lanes
629 * 0x01 = 1 lane, 0x02 = 2 lanes, 0x04 = 4 lanes
630 */
631 drm_dp_dpcd_readb(&dp->aux, DP_MAX_LANE_COUNT, &data);
632 *lane_count = DPCD_MAX_LANE_COUNT(data);
633 }
634
635 static void analogix_dp_init_training(struct analogix_dp_device *dp,
636 enum link_lane_count_type max_lane,
637 int max_rate)
638 {
639 /*
640 * MACRO_RST must be applied after the PLL_LOCK to avoid
641 * the DP inter pair skew issue for at least 10 us
642 */
643 analogix_dp_reset_macro(dp);
644
645 /* Initialize by reading RX's DPCD */
646 analogix_dp_get_max_rx_bandwidth(dp, &dp->link_train.link_rate);
647 analogix_dp_get_max_rx_lane_count(dp, &dp->link_train.lane_count);
648
649 if ((dp->link_train.link_rate != DP_LINK_BW_1_62) &&
650 (dp->link_train.link_rate != DP_LINK_BW_2_7) &&
651 (dp->link_train.link_rate != DP_LINK_BW_5_4)) {
652 dev_err(dp->dev, "Rx Max Link Rate is abnormal :%x !\n",
653 dp->link_train.link_rate);
654 dp->link_train.link_rate = DP_LINK_BW_1_62;
655 }
656
657 if (dp->link_train.lane_count == 0) {
658 dev_err(dp->dev, "Rx Max Lane count is abnormal :%x !\n",
659 dp->link_train.lane_count);
660 dp->link_train.lane_count = (u8)LANE_COUNT1;
661 }
662
663 /* Setup TX lane count & rate */
664 if (dp->link_train.lane_count > max_lane)
665 dp->link_train.lane_count = max_lane;
666 if (dp->link_train.link_rate > max_rate)
667 dp->link_train.link_rate = max_rate;
668
669 /* All DP analog module power up */
670 analogix_dp_set_analog_power_down(dp, POWER_ALL, 0);
671 }
672
673 static int analogix_dp_sw_link_training(struct analogix_dp_device *dp)
674 {
675 int retval = 0, training_finished = 0;
676
677 dp->link_train.lt_state = START;
678
679 /* Process here */
680 while (!retval && !training_finished) {
681 switch (dp->link_train.lt_state) {
682 case START:
683 retval = analogix_dp_link_start(dp);
684 if (retval)
685 dev_err(dp->dev, "LT link start failed!\n");
686 break;
687 case CLOCK_RECOVERY:
688 retval = analogix_dp_process_clock_recovery(dp);
689 if (retval)
690 dev_err(dp->dev, "LT CR failed!\n");
691 break;
692 case EQUALIZER_TRAINING:
693 retval = analogix_dp_process_equalizer_training(dp);
694 if (retval)
695 dev_err(dp->dev, "LT EQ failed!\n");
696 break;
697 case FINISHED:
698 training_finished = 1;
699 break;
700 case FAILED:
701 return -EREMOTEIO;
702 }
703 }
704 if (retval)
705 dev_err(dp->dev, "eDP link training failed (%d)\n", retval);
706
707 return retval;
708 }
709
710 static int analogix_dp_set_link_train(struct analogix_dp_device *dp,
711 u32 count, u32 bwtype)
712 {
713 int i;
714 int retval;
715
716 for (i = 0; i < DP_TIMEOUT_LOOP_COUNT; i++) {
717 analogix_dp_init_training(dp, count, bwtype);
718 retval = analogix_dp_sw_link_training(dp);
719 if (retval == 0)
720 break;
721
722 usleep_range(100, 110);
723 }
724
725 return retval;
726 }
727
728 static int analogix_dp_config_video(struct analogix_dp_device *dp)
729 {
730 int retval = 0;
731 int timeout_loop = 0;
732 int done_count = 0;
733
734 analogix_dp_config_video_slave_mode(dp);
735
736 analogix_dp_set_video_color_format(dp);
737
738 if (analogix_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) {
739 dev_err(dp->dev, "PLL is not locked yet.\n");
740 return -EINVAL;
741 }
742
743 for (;;) {
744 timeout_loop++;
745 if (analogix_dp_is_slave_video_stream_clock_on(dp) == 0)
746 break;
747 if (timeout_loop > DP_TIMEOUT_LOOP_COUNT) {
748 dev_err(dp->dev, "Timeout of video streamclk ok\n");
749 return -ETIMEDOUT;
750 }
751
752 usleep_range(1, 2);
753 }
754
755 /* Set to use the register calculated M/N video */
756 analogix_dp_set_video_cr_mn(dp, CALCULATED_M, 0, 0);
757
758 /* For video bist, Video timing must be generated by register */
759 analogix_dp_set_video_timing_mode(dp, VIDEO_TIMING_FROM_CAPTURE);
760
761 /* Disable video mute */
762 analogix_dp_enable_video_mute(dp, 0);
763
764 /* Configure video slave mode */
765 analogix_dp_enable_video_master(dp, 0);
766
767 timeout_loop = 0;
768
769 for (;;) {
770 timeout_loop++;
771 if (analogix_dp_is_video_stream_on(dp) == 0) {
772 done_count++;
773 if (done_count > 10)
774 break;
775 } else if (done_count) {
776 done_count = 0;
777 }
778 if (timeout_loop > DP_TIMEOUT_LOOP_COUNT) {
779 dev_err(dp->dev, "Timeout of video streamclk ok\n");
780 return -ETIMEDOUT;
781 }
782
783 usleep_range(1000, 1001);
784 }
785
786 if (retval != 0)
787 dev_err(dp->dev, "Video stream is not detected!\n");
788
789 return retval;
790 }
791
792 static void analogix_dp_enable_scramble(struct analogix_dp_device *dp,
793 bool enable)
794 {
795 u8 data;
796
797 if (enable) {
798 analogix_dp_enable_scrambling(dp);
799
800 drm_dp_dpcd_readb(&dp->aux, DP_TRAINING_PATTERN_SET, &data);
801 drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
802 (u8)(data & ~DP_LINK_SCRAMBLING_DISABLE));
803 } else {
804 analogix_dp_disable_scrambling(dp);
805
806 drm_dp_dpcd_readb(&dp->aux, DP_TRAINING_PATTERN_SET, &data);
807 drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
808 (u8)(data | DP_LINK_SCRAMBLING_DISABLE));
809 }
810 }
811
812 static irqreturn_t analogix_dp_hardirq(int irq, void *arg)
813 {
814 struct analogix_dp_device *dp = arg;
815 irqreturn_t ret = IRQ_NONE;
816 enum dp_irq_type irq_type;
817
818 irq_type = analogix_dp_get_irq_type(dp);
819 if (irq_type != DP_IRQ_TYPE_UNKNOWN) {
820 analogix_dp_mute_hpd_interrupt(dp);
821 ret = IRQ_WAKE_THREAD;
822 }
823
824 return ret;
825 }
826
827 static irqreturn_t analogix_dp_irq_thread(int irq, void *arg)
828 {
829 struct analogix_dp_device *dp = arg;
830 enum dp_irq_type irq_type;
831
832 irq_type = analogix_dp_get_irq_type(dp);
833 if (irq_type & DP_IRQ_TYPE_HP_CABLE_IN ||
834 irq_type & DP_IRQ_TYPE_HP_CABLE_OUT) {
835 dev_dbg(dp->dev, "Detected cable status changed!\n");
836 if (dp->drm_dev)
837 drm_helper_hpd_irq_event(dp->drm_dev);
838 }
839
840 if (irq_type != DP_IRQ_TYPE_UNKNOWN) {
841 analogix_dp_clear_hotplug_interrupts(dp);
842 analogix_dp_unmute_hpd_interrupt(dp);
843 }
844
845 return IRQ_HANDLED;
846 }
847
848 static void analogix_dp_commit(struct analogix_dp_device *dp)
849 {
850 int ret;
851
852 /* Keep the panel disabled while we configure video */
853 if (dp->plat_data->panel) {
854 if (drm_panel_disable(dp->plat_data->panel))
855 DRM_ERROR("failed to disable the panel\n");
856 }
857
858 ret = analogix_dp_set_link_train(dp, dp->video_info.max_lane_count,
859 dp->video_info.max_link_rate);
860 if (ret) {
861 dev_err(dp->dev, "unable to do link train\n");
862 return;
863 }
864
865 analogix_dp_enable_scramble(dp, 1);
866 analogix_dp_enable_rx_to_enhanced_mode(dp, 1);
867 analogix_dp_enable_enhanced_mode(dp, 1);
868
869 analogix_dp_init_video(dp);
870 ret = analogix_dp_config_video(dp);
871 if (ret)
872 dev_err(dp->dev, "unable to config video\n");
873
874 /* Safe to enable the panel now */
875 if (dp->plat_data->panel) {
876 if (drm_panel_enable(dp->plat_data->panel))
877 DRM_ERROR("failed to enable the panel\n");
878 }
879
880 /* Enable video */
881 analogix_dp_start_video(dp);
882
883 dp->psr_support = analogix_dp_detect_sink_psr(dp);
884 if (dp->psr_support)
885 analogix_dp_enable_sink_psr(dp);
886 }
887
888 /*
889 * This function is a bit of a catch-all for panel preparation, hopefully
890 * simplifying the logic of functions that need to prepare/unprepare the panel
891 * below.
892 *
893 * If @prepare is true, this function will prepare the panel. Conversely, if it
894 * is false, the panel will be unprepared.
895 *
896 * If @is_modeset_prepare is true, the function will disregard the current state
897 * of the panel and either prepare/unprepare the panel based on @prepare. Once
898 * it finishes, it will update dp->panel_is_modeset to reflect the current state
899 * of the panel.
900 */
901 static int analogix_dp_prepare_panel(struct analogix_dp_device *dp,
902 bool prepare, bool is_modeset_prepare)
903 {
904 int ret = 0;
905
906 if (!dp->plat_data->panel)
907 return 0;
908
909 mutex_lock(&dp->panel_lock);
910
911 /*
912 * Exit early if this is a temporary prepare/unprepare and we're already
913 * modeset (since we neither want to prepare twice or unprepare early).
914 */
915 if (dp->panel_is_modeset && !is_modeset_prepare)
916 goto out;
917
918 if (prepare)
919 ret = drm_panel_prepare(dp->plat_data->panel);
920 else
921 ret = drm_panel_unprepare(dp->plat_data->panel);
922
923 if (ret)
924 goto out;
925
926 if (is_modeset_prepare)
927 dp->panel_is_modeset = prepare;
928
929 out:
930 mutex_unlock(&dp->panel_lock);
931 return ret;
932 }
933
934 static int analogix_dp_get_modes(struct drm_connector *connector)
935 {
936 struct analogix_dp_device *dp = to_dp(connector);
937 struct edid *edid;
938 int ret, num_modes = 0;
939
940 if (dp->plat_data->panel) {
941 num_modes += drm_panel_get_modes(dp->plat_data->panel);
942 } else {
943 ret = analogix_dp_prepare_panel(dp, true, false);
944 if (ret) {
945 DRM_ERROR("Failed to prepare panel (%d)\n", ret);
946 return 0;
947 }
948
949 pm_runtime_get_sync(dp->dev);
950 edid = drm_get_edid(connector, &dp->aux.ddc);
951 pm_runtime_put(dp->dev);
952 if (edid) {
953 drm_mode_connector_update_edid_property(&dp->connector,
954 edid);
955 num_modes += drm_add_edid_modes(&dp->connector, edid);
956 kfree(edid);
957 }
958
959 ret = analogix_dp_prepare_panel(dp, false, false);
960 if (ret)
961 DRM_ERROR("Failed to unprepare panel (%d)\n", ret);
962 }
963
964 if (dp->plat_data->get_modes)
965 num_modes += dp->plat_data->get_modes(dp->plat_data, connector);
966
967 return num_modes;
968 }
969
970 static struct drm_encoder *
971 analogix_dp_best_encoder(struct drm_connector *connector)
972 {
973 struct analogix_dp_device *dp = to_dp(connector);
974
975 return dp->encoder;
976 }
977
978 static const struct drm_connector_helper_funcs analogix_dp_connector_helper_funcs = {
979 .get_modes = analogix_dp_get_modes,
980 .best_encoder = analogix_dp_best_encoder,
981 };
982
983 static enum drm_connector_status
984 analogix_dp_detect(struct drm_connector *connector, bool force)
985 {
986 struct analogix_dp_device *dp = to_dp(connector);
987 enum drm_connector_status status = connector_status_disconnected;
988 int ret;
989
990 if (dp->plat_data->panel)
991 return connector_status_connected;
992
993 ret = analogix_dp_prepare_panel(dp, true, false);
994 if (ret) {
995 DRM_ERROR("Failed to prepare panel (%d)\n", ret);
996 return connector_status_disconnected;
997 }
998
999 if (!analogix_dp_detect_hpd(dp))
1000 status = connector_status_connected;
1001
1002 ret = analogix_dp_prepare_panel(dp, false, false);
1003 if (ret)
1004 DRM_ERROR("Failed to unprepare panel (%d)\n", ret);
1005
1006 return status;
1007 }
1008
1009 static const struct drm_connector_funcs analogix_dp_connector_funcs = {
1010 .fill_modes = drm_helper_probe_single_connector_modes,
1011 .detect = analogix_dp_detect,
1012 .destroy = drm_connector_cleanup,
1013 .reset = drm_atomic_helper_connector_reset,
1014 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
1015 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
1016 };
1017
1018 static int analogix_dp_bridge_attach(struct drm_bridge *bridge)
1019 {
1020 struct analogix_dp_device *dp = bridge->driver_private;
1021 struct drm_encoder *encoder = dp->encoder;
1022 struct drm_connector *connector = &dp->connector;
1023 int ret;
1024
1025 if (!bridge->encoder) {
1026 DRM_ERROR("Parent encoder object not found");
1027 return -ENODEV;
1028 }
1029
1030 connector->polled = DRM_CONNECTOR_POLL_HPD;
1031
1032 ret = drm_connector_init(dp->drm_dev, connector,
1033 &analogix_dp_connector_funcs,
1034 DRM_MODE_CONNECTOR_eDP);
1035 if (ret) {
1036 DRM_ERROR("Failed to initialize connector with drm\n");
1037 return ret;
1038 }
1039
1040 drm_connector_helper_add(connector,
1041 &analogix_dp_connector_helper_funcs);
1042 drm_mode_connector_attach_encoder(connector, encoder);
1043
1044 /*
1045 * NOTE: the connector registration is implemented in analogix
1046 * platform driver, that to say connector would be exist after
1047 * plat_data->attch return, that's why we record the connector
1048 * point after plat attached.
1049 */
1050 if (dp->plat_data->attach) {
1051 ret = dp->plat_data->attach(dp->plat_data, bridge, connector);
1052 if (ret) {
1053 DRM_ERROR("Failed at platform attch func\n");
1054 return ret;
1055 }
1056 }
1057
1058 if (dp->plat_data->panel) {
1059 ret = drm_panel_attach(dp->plat_data->panel, &dp->connector);
1060 if (ret) {
1061 DRM_ERROR("Failed to attach panel\n");
1062 return ret;
1063 }
1064 }
1065
1066 return 0;
1067 }
1068
1069 static void analogix_dp_bridge_pre_enable(struct drm_bridge *bridge)
1070 {
1071 struct analogix_dp_device *dp = bridge->driver_private;
1072 int ret;
1073
1074 ret = analogix_dp_prepare_panel(dp, true, true);
1075 if (ret)
1076 DRM_ERROR("failed to setup the panel ret = %d\n", ret);
1077 }
1078
1079 static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
1080 {
1081 struct analogix_dp_device *dp = bridge->driver_private;
1082
1083 if (dp->dpms_mode == DRM_MODE_DPMS_ON)
1084 return;
1085
1086 pm_runtime_get_sync(dp->dev);
1087
1088 if (dp->plat_data->power_on)
1089 dp->plat_data->power_on(dp->plat_data);
1090
1091 phy_power_on(dp->phy);
1092 analogix_dp_init_dp(dp);
1093 enable_irq(dp->irq);
1094 analogix_dp_commit(dp);
1095
1096 dp->dpms_mode = DRM_MODE_DPMS_ON;
1097 }
1098
1099 static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
1100 {
1101 struct analogix_dp_device *dp = bridge->driver_private;
1102 int ret;
1103
1104 if (dp->dpms_mode != DRM_MODE_DPMS_ON)
1105 return;
1106
1107 if (dp->plat_data->panel) {
1108 if (drm_panel_disable(dp->plat_data->panel)) {
1109 DRM_ERROR("failed to disable the panel\n");
1110 return;
1111 }
1112 }
1113
1114 disable_irq(dp->irq);
1115 phy_power_off(dp->phy);
1116
1117 if (dp->plat_data->power_off)
1118 dp->plat_data->power_off(dp->plat_data);
1119
1120 pm_runtime_put_sync(dp->dev);
1121
1122 ret = analogix_dp_prepare_panel(dp, false, true);
1123 if (ret)
1124 DRM_ERROR("failed to setup the panel ret = %d\n", ret);
1125
1126 dp->dpms_mode = DRM_MODE_DPMS_OFF;
1127 }
1128
1129 static void analogix_dp_bridge_mode_set(struct drm_bridge *bridge,
1130 struct drm_display_mode *orig_mode,
1131 struct drm_display_mode *mode)
1132 {
1133 struct analogix_dp_device *dp = bridge->driver_private;
1134 struct drm_display_info *display_info = &dp->connector.display_info;
1135 struct video_info *video = &dp->video_info;
1136 struct device_node *dp_node = dp->dev->of_node;
1137 int vic;
1138
1139 /* Input video interlaces & hsync pol & vsync pol */
1140 video->interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
1141 video->v_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NVSYNC);
1142 video->h_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NHSYNC);
1143
1144 /* Input video dynamic_range & colorimetry */
1145 vic = drm_match_cea_mode(mode);
1146 if ((vic == 6) || (vic == 7) || (vic == 21) || (vic == 22) ||
1147 (vic == 2) || (vic == 3) || (vic == 17) || (vic == 18)) {
1148 video->dynamic_range = CEA;
1149 video->ycbcr_coeff = COLOR_YCBCR601;
1150 } else if (vic) {
1151 video->dynamic_range = CEA;
1152 video->ycbcr_coeff = COLOR_YCBCR709;
1153 } else {
1154 video->dynamic_range = VESA;
1155 video->ycbcr_coeff = COLOR_YCBCR709;
1156 }
1157
1158 /* Input vide bpc and color_formats */
1159 switch (display_info->bpc) {
1160 case 12:
1161 video->color_depth = COLOR_12;
1162 break;
1163 case 10:
1164 video->color_depth = COLOR_10;
1165 break;
1166 case 8:
1167 video->color_depth = COLOR_8;
1168 break;
1169 case 6:
1170 video->color_depth = COLOR_6;
1171 break;
1172 default:
1173 video->color_depth = COLOR_8;
1174 break;
1175 }
1176 if (display_info->color_formats & DRM_COLOR_FORMAT_YCRCB444)
1177 video->color_space = COLOR_YCBCR444;
1178 else if (display_info->color_formats & DRM_COLOR_FORMAT_YCRCB422)
1179 video->color_space = COLOR_YCBCR422;
1180 else if (display_info->color_formats & DRM_COLOR_FORMAT_RGB444)
1181 video->color_space = COLOR_RGB;
1182 else
1183 video->color_space = COLOR_RGB;
1184
1185 /*
1186 * NOTE: those property parsing code is used for providing backward
1187 * compatibility for samsung platform.
1188 * Due to we used the "of_property_read_u32" interfaces, when this
1189 * property isn't present, the "video_info" can keep the original
1190 * values and wouldn't be modified.
1191 */
1192 of_property_read_u32(dp_node, "samsung,color-space",
1193 &video->color_space);
1194 of_property_read_u32(dp_node, "samsung,dynamic-range",
1195 &video->dynamic_range);
1196 of_property_read_u32(dp_node, "samsung,ycbcr-coeff",
1197 &video->ycbcr_coeff);
1198 of_property_read_u32(dp_node, "samsung,color-depth",
1199 &video->color_depth);
1200 if (of_property_read_bool(dp_node, "hsync-active-high"))
1201 video->h_sync_polarity = true;
1202 if (of_property_read_bool(dp_node, "vsync-active-high"))
1203 video->v_sync_polarity = true;
1204 if (of_property_read_bool(dp_node, "interlaced"))
1205 video->interlaced = true;
1206 }
1207
1208 static void analogix_dp_bridge_nop(struct drm_bridge *bridge)
1209 {
1210 /* do nothing */
1211 }
1212
1213 static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
1214 .pre_enable = analogix_dp_bridge_pre_enable,
1215 .enable = analogix_dp_bridge_enable,
1216 .disable = analogix_dp_bridge_disable,
1217 .post_disable = analogix_dp_bridge_nop,
1218 .mode_set = analogix_dp_bridge_mode_set,
1219 .attach = analogix_dp_bridge_attach,
1220 };
1221
1222 static int analogix_dp_create_bridge(struct drm_device *drm_dev,
1223 struct analogix_dp_device *dp)
1224 {
1225 struct drm_bridge *bridge;
1226 int ret;
1227
1228 bridge = devm_kzalloc(drm_dev->dev, sizeof(*bridge), GFP_KERNEL);
1229 if (!bridge) {
1230 DRM_ERROR("failed to allocate for drm bridge\n");
1231 return -ENOMEM;
1232 }
1233
1234 dp->bridge = bridge;
1235
1236 bridge->driver_private = dp;
1237 bridge->funcs = &analogix_dp_bridge_funcs;
1238
1239 ret = drm_bridge_attach(dp->encoder, bridge, NULL);
1240 if (ret) {
1241 DRM_ERROR("failed to attach drm bridge\n");
1242 return -EINVAL;
1243 }
1244
1245 return 0;
1246 }
1247
1248 static int analogix_dp_dt_parse_pdata(struct analogix_dp_device *dp)
1249 {
1250 struct device_node *dp_node = dp->dev->of_node;
1251 struct video_info *video_info = &dp->video_info;
1252
1253 switch (dp->plat_data->dev_type) {
1254 case RK3288_DP:
1255 case RK3399_EDP:
1256 /*
1257 * Like Rk3288 DisplayPort TRM indicate that "Main link
1258 * containing 4 physical lanes of 2.7/1.62 Gbps/lane".
1259 */
1260 video_info->max_link_rate = 0x0A;
1261 video_info->max_lane_count = 0x04;
1262 break;
1263 case EXYNOS_DP:
1264 /*
1265 * NOTE: those property parseing code is used for
1266 * providing backward compatibility for samsung platform.
1267 */
1268 of_property_read_u32(dp_node, "samsung,link-rate",
1269 &video_info->max_link_rate);
1270 of_property_read_u32(dp_node, "samsung,lane-count",
1271 &video_info->max_lane_count);
1272 break;
1273 }
1274
1275 return 0;
1276 }
1277
1278 static ssize_t analogix_dpaux_transfer(struct drm_dp_aux *aux,
1279 struct drm_dp_aux_msg *msg)
1280 {
1281 struct analogix_dp_device *dp = to_dp(aux);
1282
1283 return analogix_dp_transfer(dp, msg);
1284 }
1285
1286 int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
1287 struct analogix_dp_plat_data *plat_data)
1288 {
1289 struct platform_device *pdev = to_platform_device(dev);
1290 struct analogix_dp_device *dp;
1291 struct resource *res;
1292 unsigned int irq_flags;
1293 int ret;
1294
1295 if (!plat_data) {
1296 dev_err(dev, "Invalided input plat_data\n");
1297 return -EINVAL;
1298 }
1299
1300 dp = devm_kzalloc(dev, sizeof(struct analogix_dp_device), GFP_KERNEL);
1301 if (!dp)
1302 return -ENOMEM;
1303
1304 dev_set_drvdata(dev, dp);
1305
1306 dp->dev = &pdev->dev;
1307 dp->dpms_mode = DRM_MODE_DPMS_OFF;
1308
1309 mutex_init(&dp->panel_lock);
1310 dp->panel_is_modeset = false;
1311
1312 /*
1313 * platform dp driver need containor_of the plat_data to get
1314 * the driver private data, so we need to store the point of
1315 * plat_data, not the context of plat_data.
1316 */
1317 dp->plat_data = plat_data;
1318
1319 ret = analogix_dp_dt_parse_pdata(dp);
1320 if (ret)
1321 return ret;
1322
1323 dp->phy = devm_phy_get(dp->dev, "dp");
1324 if (IS_ERR(dp->phy)) {
1325 dev_err(dp->dev, "no DP phy configured\n");
1326 ret = PTR_ERR(dp->phy);
1327 if (ret) {
1328 /*
1329 * phy itself is not enabled, so we can move forward
1330 * assigning NULL to phy pointer.
1331 */
1332 if (ret == -ENOSYS || ret == -ENODEV)
1333 dp->phy = NULL;
1334 else
1335 return ret;
1336 }
1337 }
1338
1339 dp->clock = devm_clk_get(&pdev->dev, "dp");
1340 if (IS_ERR(dp->clock)) {
1341 dev_err(&pdev->dev, "failed to get clock\n");
1342 return PTR_ERR(dp->clock);
1343 }
1344
1345 clk_prepare_enable(dp->clock);
1346
1347 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1348
1349 dp->reg_base = devm_ioremap_resource(&pdev->dev, res);
1350 if (IS_ERR(dp->reg_base))
1351 return PTR_ERR(dp->reg_base);
1352
1353 dp->force_hpd = of_property_read_bool(dev->of_node, "force-hpd");
1354
1355 dp->hpd_gpio = of_get_named_gpio(dev->of_node, "hpd-gpios", 0);
1356 if (!gpio_is_valid(dp->hpd_gpio))
1357 dp->hpd_gpio = of_get_named_gpio(dev->of_node,
1358 "samsung,hpd-gpio", 0);
1359
1360 if (gpio_is_valid(dp->hpd_gpio)) {
1361 /*
1362 * Set up the hotplug GPIO from the device tree as an interrupt.
1363 * Simply specifying a different interrupt in the device tree
1364 * doesn't work since we handle hotplug rather differently when
1365 * using a GPIO. We also need the actual GPIO specifier so
1366 * that we can get the current state of the GPIO.
1367 */
1368 ret = devm_gpio_request_one(&pdev->dev, dp->hpd_gpio, GPIOF_IN,
1369 "hpd_gpio");
1370 if (ret) {
1371 dev_err(&pdev->dev, "failed to get hpd gpio\n");
1372 return ret;
1373 }
1374 dp->irq = gpio_to_irq(dp->hpd_gpio);
1375 irq_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
1376 } else {
1377 dp->hpd_gpio = -ENODEV;
1378 dp->irq = platform_get_irq(pdev, 0);
1379 irq_flags = 0;
1380 }
1381
1382 if (dp->irq == -ENXIO) {
1383 dev_err(&pdev->dev, "failed to get irq\n");
1384 return -ENODEV;
1385 }
1386
1387 pm_runtime_enable(dev);
1388
1389 pm_runtime_get_sync(dev);
1390 phy_power_on(dp->phy);
1391
1392 analogix_dp_init_dp(dp);
1393
1394 ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
1395 analogix_dp_hardirq,
1396 analogix_dp_irq_thread,
1397 irq_flags, "analogix-dp", dp);
1398 if (ret) {
1399 dev_err(&pdev->dev, "failed to request irq\n");
1400 goto err_disable_pm_runtime;
1401 }
1402 disable_irq(dp->irq);
1403
1404 dp->drm_dev = drm_dev;
1405 dp->encoder = dp->plat_data->encoder;
1406
1407 dp->aux.name = "DP-AUX";
1408 dp->aux.transfer = analogix_dpaux_transfer;
1409 dp->aux.dev = &pdev->dev;
1410
1411 ret = drm_dp_aux_register(&dp->aux);
1412 if (ret)
1413 goto err_disable_pm_runtime;
1414
1415 ret = analogix_dp_create_bridge(drm_dev, dp);
1416 if (ret) {
1417 DRM_ERROR("failed to create bridge (%d)\n", ret);
1418 drm_encoder_cleanup(dp->encoder);
1419 goto err_disable_pm_runtime;
1420 }
1421
1422 phy_power_off(dp->phy);
1423 pm_runtime_put(dev);
1424
1425 return 0;
1426
1427 err_disable_pm_runtime:
1428
1429 phy_power_off(dp->phy);
1430 pm_runtime_put(dev);
1431 pm_runtime_disable(dev);
1432
1433 return ret;
1434 }
1435 EXPORT_SYMBOL_GPL(analogix_dp_bind);
1436
1437 void analogix_dp_unbind(struct device *dev, struct device *master,
1438 void *data)
1439 {
1440 struct analogix_dp_device *dp = dev_get_drvdata(dev);
1441
1442 analogix_dp_bridge_disable(dp->bridge);
1443 dp->connector.funcs->destroy(&dp->connector);
1444 dp->encoder->funcs->destroy(dp->encoder);
1445
1446 if (dp->plat_data->panel) {
1447 if (drm_panel_unprepare(dp->plat_data->panel))
1448 DRM_ERROR("failed to turnoff the panel\n");
1449 if (drm_panel_detach(dp->plat_data->panel))
1450 DRM_ERROR("failed to detach the panel\n");
1451 }
1452
1453 drm_dp_aux_unregister(&dp->aux);
1454 pm_runtime_disable(dev);
1455 clk_disable_unprepare(dp->clock);
1456 }
1457 EXPORT_SYMBOL_GPL(analogix_dp_unbind);
1458
1459 #ifdef CONFIG_PM
1460 int analogix_dp_suspend(struct device *dev)
1461 {
1462 struct analogix_dp_device *dp = dev_get_drvdata(dev);
1463
1464 clk_disable_unprepare(dp->clock);
1465
1466 if (dp->plat_data->panel) {
1467 if (drm_panel_unprepare(dp->plat_data->panel))
1468 DRM_ERROR("failed to turnoff the panel\n");
1469 }
1470
1471 return 0;
1472 }
1473 EXPORT_SYMBOL_GPL(analogix_dp_suspend);
1474
1475 int analogix_dp_resume(struct device *dev)
1476 {
1477 struct analogix_dp_device *dp = dev_get_drvdata(dev);
1478 int ret;
1479
1480 ret = clk_prepare_enable(dp->clock);
1481 if (ret < 0) {
1482 DRM_ERROR("Failed to prepare_enable the clock clk [%d]\n", ret);
1483 return ret;
1484 }
1485
1486 if (dp->plat_data->panel) {
1487 if (drm_panel_prepare(dp->plat_data->panel)) {
1488 DRM_ERROR("failed to setup the panel\n");
1489 return -EBUSY;
1490 }
1491 }
1492
1493 return 0;
1494 }
1495 EXPORT_SYMBOL_GPL(analogix_dp_resume);
1496 #endif
1497
1498 int analogix_dp_start_crc(struct drm_connector *connector)
1499 {
1500 struct analogix_dp_device *dp = to_dp(connector);
1501
1502 if (!connector->state->crtc) {
1503 DRM_ERROR("Connector %s doesn't currently have a CRTC.\n",
1504 connector->name);
1505 return -EINVAL;
1506 }
1507
1508 return drm_dp_start_crc(&dp->aux, connector->state->crtc);
1509 }
1510 EXPORT_SYMBOL_GPL(analogix_dp_start_crc);
1511
1512 int analogix_dp_stop_crc(struct drm_connector *connector)
1513 {
1514 struct analogix_dp_device *dp = to_dp(connector);
1515
1516 return drm_dp_stop_crc(&dp->aux);
1517 }
1518 EXPORT_SYMBOL_GPL(analogix_dp_stop_crc);
1519
1520 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
1521 MODULE_DESCRIPTION("Analogix DP Core Driver");
1522 MODULE_LICENSE("GPL v2");
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