1 /*
2 * Samsung SoC DP (Display Port) 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/of_graph.h>
22 #include <linux/gpio.h>
23 #include <linux/component.h>
24 #include <linux/phy/phy.h>
25 #include <video/of_display_timing.h>
26 #include <video/of_videomode.h>
27
28 #include <drm/drmP.h>
29 #include <drm/drm_crtc.h>
30 #include <drm/drm_crtc_helper.h>
31 #include <drm/drm_panel.h>
32 #include <drm/bridge/ptn3460.h>
33
34 #include "exynos_dp_core.h"
35
36 #define ctx_from_connector(c) container_of(c, struct exynos_dp_device, \
37 connector)
38
dp_to_crtc(struct exynos_dp_device * dp)39 static inline struct exynos_drm_crtc *dp_to_crtc(struct exynos_dp_device *dp)
40 {
41 return to_exynos_crtc(dp->encoder->crtc);
42 }
43
44 static inline struct exynos_dp_device *
display_to_dp(struct exynos_drm_display * d)45 display_to_dp(struct exynos_drm_display *d)
46 {
47 return container_of(d, struct exynos_dp_device, display);
48 }
49
50 struct bridge_init {
51 struct i2c_client *client;
52 struct device_node *node;
53 };
54
exynos_dp_init_dp(struct exynos_dp_device * dp)55 static void exynos_dp_init_dp(struct exynos_dp_device *dp)
56 {
57 exynos_dp_reset(dp);
58
59 exynos_dp_swreset(dp);
60
61 exynos_dp_init_analog_param(dp);
62 exynos_dp_init_interrupt(dp);
63
64 /* SW defined function Normal operation */
65 exynos_dp_enable_sw_function(dp);
66
67 exynos_dp_config_interrupt(dp);
68 exynos_dp_init_analog_func(dp);
69
70 exynos_dp_init_hpd(dp);
71 exynos_dp_init_aux(dp);
72 }
73
exynos_dp_detect_hpd(struct exynos_dp_device * dp)74 static int exynos_dp_detect_hpd(struct exynos_dp_device *dp)
75 {
76 int timeout_loop = 0;
77
78 while (exynos_dp_get_plug_in_status(dp) != 0) {
79 timeout_loop++;
80 if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {
81 dev_err(dp->dev, "failed to get hpd plug status\n");
82 return -ETIMEDOUT;
83 }
84 usleep_range(10, 11);
85 }
86
87 return 0;
88 }
89
exynos_dp_calc_edid_check_sum(unsigned char * edid_data)90 static unsigned char exynos_dp_calc_edid_check_sum(unsigned char *edid_data)
91 {
92 int i;
93 unsigned char sum = 0;
94
95 for (i = 0; i < EDID_BLOCK_LENGTH; i++)
96 sum = sum + edid_data[i];
97
98 return sum;
99 }
100
exynos_dp_read_edid(struct exynos_dp_device * dp)101 static int exynos_dp_read_edid(struct exynos_dp_device *dp)
102 {
103 unsigned char edid[EDID_BLOCK_LENGTH * 2];
104 unsigned int extend_block = 0;
105 unsigned char sum;
106 unsigned char test_vector;
107 int retval;
108
109 /*
110 * EDID device address is 0x50.
111 * However, if necessary, you must have set upper address
112 * into E-EDID in I2C device, 0x30.
113 */
114
115 /* Read Extension Flag, Number of 128-byte EDID extension blocks */
116 retval = exynos_dp_read_byte_from_i2c(dp, I2C_EDID_DEVICE_ADDR,
117 EDID_EXTENSION_FLAG,
118 &extend_block);
119 if (retval)
120 return retval;
121
122 if (extend_block > 0) {
123 dev_dbg(dp->dev, "EDID data includes a single extension!\n");
124
125 /* Read EDID data */
126 retval = exynos_dp_read_bytes_from_i2c(dp, I2C_EDID_DEVICE_ADDR,
127 EDID_HEADER_PATTERN,
128 EDID_BLOCK_LENGTH,
129 &edid[EDID_HEADER_PATTERN]);
130 if (retval != 0) {
131 dev_err(dp->dev, "EDID Read failed!\n");
132 return -EIO;
133 }
134 sum = exynos_dp_calc_edid_check_sum(edid);
135 if (sum != 0) {
136 dev_err(dp->dev, "EDID bad checksum!\n");
137 return -EIO;
138 }
139
140 /* Read additional EDID data */
141 retval = exynos_dp_read_bytes_from_i2c(dp,
142 I2C_EDID_DEVICE_ADDR,
143 EDID_BLOCK_LENGTH,
144 EDID_BLOCK_LENGTH,
145 &edid[EDID_BLOCK_LENGTH]);
146 if (retval != 0) {
147 dev_err(dp->dev, "EDID Read failed!\n");
148 return -EIO;
149 }
150 sum = exynos_dp_calc_edid_check_sum(&edid[EDID_BLOCK_LENGTH]);
151 if (sum != 0) {
152 dev_err(dp->dev, "EDID bad checksum!\n");
153 return -EIO;
154 }
155
156 exynos_dp_read_byte_from_dpcd(dp, DP_TEST_REQUEST,
157 &test_vector);
158 if (test_vector & DP_TEST_LINK_EDID_READ) {
159 exynos_dp_write_byte_to_dpcd(dp,
160 DP_TEST_EDID_CHECKSUM,
161 edid[EDID_BLOCK_LENGTH + EDID_CHECKSUM]);
162 exynos_dp_write_byte_to_dpcd(dp,
163 DP_TEST_RESPONSE,
164 DP_TEST_EDID_CHECKSUM_WRITE);
165 }
166 } else {
167 dev_info(dp->dev, "EDID data does not include any extensions.\n");
168
169 /* Read EDID data */
170 retval = exynos_dp_read_bytes_from_i2c(dp,
171 I2C_EDID_DEVICE_ADDR,
172 EDID_HEADER_PATTERN,
173 EDID_BLOCK_LENGTH,
174 &edid[EDID_HEADER_PATTERN]);
175 if (retval != 0) {
176 dev_err(dp->dev, "EDID Read failed!\n");
177 return -EIO;
178 }
179 sum = exynos_dp_calc_edid_check_sum(edid);
180 if (sum != 0) {
181 dev_err(dp->dev, "EDID bad checksum!\n");
182 return -EIO;
183 }
184
185 exynos_dp_read_byte_from_dpcd(dp,
186 DP_TEST_REQUEST,
187 &test_vector);
188 if (test_vector & DP_TEST_LINK_EDID_READ) {
189 exynos_dp_write_byte_to_dpcd(dp,
190 DP_TEST_EDID_CHECKSUM,
191 edid[EDID_CHECKSUM]);
192 exynos_dp_write_byte_to_dpcd(dp,
193 DP_TEST_RESPONSE,
194 DP_TEST_EDID_CHECKSUM_WRITE);
195 }
196 }
197
198 dev_dbg(dp->dev, "EDID Read success!\n");
199 return 0;
200 }
201
exynos_dp_handle_edid(struct exynos_dp_device * dp)202 static int exynos_dp_handle_edid(struct exynos_dp_device *dp)
203 {
204 u8 buf[12];
205 int i;
206 int retval;
207
208 /* Read DPCD DP_DPCD_REV~RECEIVE_PORT1_CAP_1 */
209 retval = exynos_dp_read_bytes_from_dpcd(dp, DP_DPCD_REV,
210 12, buf);
211 if (retval)
212 return retval;
213
214 /* Read EDID */
215 for (i = 0; i < 3; i++) {
216 retval = exynos_dp_read_edid(dp);
217 if (!retval)
218 break;
219 }
220
221 return retval;
222 }
223
exynos_dp_enable_rx_to_enhanced_mode(struct exynos_dp_device * dp,bool enable)224 static void exynos_dp_enable_rx_to_enhanced_mode(struct exynos_dp_device *dp,
225 bool enable)
226 {
227 u8 data;
228
229 exynos_dp_read_byte_from_dpcd(dp, DP_LANE_COUNT_SET, &data);
230
231 if (enable)
232 exynos_dp_write_byte_to_dpcd(dp, DP_LANE_COUNT_SET,
233 DP_LANE_COUNT_ENHANCED_FRAME_EN |
234 DPCD_LANE_COUNT_SET(data));
235 else
236 exynos_dp_write_byte_to_dpcd(dp, DP_LANE_COUNT_SET,
237 DPCD_LANE_COUNT_SET(data));
238 }
239
exynos_dp_is_enhanced_mode_available(struct exynos_dp_device * dp)240 static int exynos_dp_is_enhanced_mode_available(struct exynos_dp_device *dp)
241 {
242 u8 data;
243 int retval;
244
245 exynos_dp_read_byte_from_dpcd(dp, DP_MAX_LANE_COUNT, &data);
246 retval = DPCD_ENHANCED_FRAME_CAP(data);
247
248 return retval;
249 }
250
exynos_dp_set_enhanced_mode(struct exynos_dp_device * dp)251 static void exynos_dp_set_enhanced_mode(struct exynos_dp_device *dp)
252 {
253 u8 data;
254
255 data = exynos_dp_is_enhanced_mode_available(dp);
256 exynos_dp_enable_rx_to_enhanced_mode(dp, data);
257 exynos_dp_enable_enhanced_mode(dp, data);
258 }
259
exynos_dp_training_pattern_dis(struct exynos_dp_device * dp)260 static void exynos_dp_training_pattern_dis(struct exynos_dp_device *dp)
261 {
262 exynos_dp_set_training_pattern(dp, DP_NONE);
263
264 exynos_dp_write_byte_to_dpcd(dp,
265 DP_TRAINING_PATTERN_SET,
266 DP_TRAINING_PATTERN_DISABLE);
267 }
268
exynos_dp_set_lane_lane_pre_emphasis(struct exynos_dp_device * dp,int pre_emphasis,int lane)269 static void exynos_dp_set_lane_lane_pre_emphasis(struct exynos_dp_device *dp,
270 int pre_emphasis, int lane)
271 {
272 switch (lane) {
273 case 0:
274 exynos_dp_set_lane0_pre_emphasis(dp, pre_emphasis);
275 break;
276 case 1:
277 exynos_dp_set_lane1_pre_emphasis(dp, pre_emphasis);
278 break;
279
280 case 2:
281 exynos_dp_set_lane2_pre_emphasis(dp, pre_emphasis);
282 break;
283
284 case 3:
285 exynos_dp_set_lane3_pre_emphasis(dp, pre_emphasis);
286 break;
287 }
288 }
289
exynos_dp_link_start(struct exynos_dp_device * dp)290 static int exynos_dp_link_start(struct exynos_dp_device *dp)
291 {
292 u8 buf[4];
293 int lane, lane_count, pll_tries, retval;
294
295 lane_count = dp->link_train.lane_count;
296
297 dp->link_train.lt_state = CLOCK_RECOVERY;
298 dp->link_train.eq_loop = 0;
299
300 for (lane = 0; lane < lane_count; lane++)
301 dp->link_train.cr_loop[lane] = 0;
302
303 /* Set link rate and count as you want to establish*/
304 exynos_dp_set_link_bandwidth(dp, dp->link_train.link_rate);
305 exynos_dp_set_lane_count(dp, dp->link_train.lane_count);
306
307 /* Setup RX configuration */
308 buf[0] = dp->link_train.link_rate;
309 buf[1] = dp->link_train.lane_count;
310 retval = exynos_dp_write_bytes_to_dpcd(dp, DP_LINK_BW_SET,
311 2, buf);
312 if (retval)
313 return retval;
314
315 /* Set TX pre-emphasis to minimum */
316 for (lane = 0; lane < lane_count; lane++)
317 exynos_dp_set_lane_lane_pre_emphasis(dp,
318 PRE_EMPHASIS_LEVEL_0, lane);
319
320 /* Wait for PLL lock */
321 pll_tries = 0;
322 while (exynos_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) {
323 if (pll_tries == DP_TIMEOUT_LOOP_COUNT) {
324 dev_err(dp->dev, "Wait for PLL lock timed out\n");
325 return -ETIMEDOUT;
326 }
327
328 pll_tries++;
329 usleep_range(90, 120);
330 }
331
332 /* Set training pattern 1 */
333 exynos_dp_set_training_pattern(dp, TRAINING_PTN1);
334
335 /* Set RX training pattern */
336 retval = exynos_dp_write_byte_to_dpcd(dp,
337 DP_TRAINING_PATTERN_SET,
338 DP_LINK_SCRAMBLING_DISABLE | DP_TRAINING_PATTERN_1);
339 if (retval)
340 return retval;
341
342 for (lane = 0; lane < lane_count; lane++)
343 buf[lane] = DP_TRAIN_PRE_EMPH_LEVEL_0 |
344 DP_TRAIN_VOLTAGE_SWING_LEVEL_0;
345
346 retval = exynos_dp_write_bytes_to_dpcd(dp, DP_TRAINING_LANE0_SET,
347 lane_count, buf);
348
349 return retval;
350 }
351
exynos_dp_get_lane_status(u8 link_status[2],int lane)352 static unsigned char exynos_dp_get_lane_status(u8 link_status[2], int lane)
353 {
354 int shift = (lane & 1) * 4;
355 u8 link_value = link_status[lane>>1];
356
357 return (link_value >> shift) & 0xf;
358 }
359
exynos_dp_clock_recovery_ok(u8 link_status[2],int lane_count)360 static int exynos_dp_clock_recovery_ok(u8 link_status[2], int lane_count)
361 {
362 int lane;
363 u8 lane_status;
364
365 for (lane = 0; lane < lane_count; lane++) {
366 lane_status = exynos_dp_get_lane_status(link_status, lane);
367 if ((lane_status & DP_LANE_CR_DONE) == 0)
368 return -EINVAL;
369 }
370 return 0;
371 }
372
exynos_dp_channel_eq_ok(u8 link_status[2],u8 link_align,int lane_count)373 static int exynos_dp_channel_eq_ok(u8 link_status[2], u8 link_align,
374 int lane_count)
375 {
376 int lane;
377 u8 lane_status;
378
379 if ((link_align & DP_INTERLANE_ALIGN_DONE) == 0)
380 return -EINVAL;
381
382 for (lane = 0; lane < lane_count; lane++) {
383 lane_status = exynos_dp_get_lane_status(link_status, lane);
384 lane_status &= DP_CHANNEL_EQ_BITS;
385 if (lane_status != DP_CHANNEL_EQ_BITS)
386 return -EINVAL;
387 }
388
389 return 0;
390 }
391
exynos_dp_get_adjust_request_voltage(u8 adjust_request[2],int lane)392 static unsigned char exynos_dp_get_adjust_request_voltage(u8 adjust_request[2],
393 int lane)
394 {
395 int shift = (lane & 1) * 4;
396 u8 link_value = adjust_request[lane>>1];
397
398 return (link_value >> shift) & 0x3;
399 }
400
exynos_dp_get_adjust_request_pre_emphasis(u8 adjust_request[2],int lane)401 static unsigned char exynos_dp_get_adjust_request_pre_emphasis(
402 u8 adjust_request[2],
403 int lane)
404 {
405 int shift = (lane & 1) * 4;
406 u8 link_value = adjust_request[lane>>1];
407
408 return ((link_value >> shift) & 0xc) >> 2;
409 }
410
exynos_dp_set_lane_link_training(struct exynos_dp_device * dp,u8 training_lane_set,int lane)411 static void exynos_dp_set_lane_link_training(struct exynos_dp_device *dp,
412 u8 training_lane_set, int lane)
413 {
414 switch (lane) {
415 case 0:
416 exynos_dp_set_lane0_link_training(dp, training_lane_set);
417 break;
418 case 1:
419 exynos_dp_set_lane1_link_training(dp, training_lane_set);
420 break;
421
422 case 2:
423 exynos_dp_set_lane2_link_training(dp, training_lane_set);
424 break;
425
426 case 3:
427 exynos_dp_set_lane3_link_training(dp, training_lane_set);
428 break;
429 }
430 }
431
exynos_dp_get_lane_link_training(struct exynos_dp_device * dp,int lane)432 static unsigned int exynos_dp_get_lane_link_training(
433 struct exynos_dp_device *dp,
434 int lane)
435 {
436 u32 reg;
437
438 switch (lane) {
439 case 0:
440 reg = exynos_dp_get_lane0_link_training(dp);
441 break;
442 case 1:
443 reg = exynos_dp_get_lane1_link_training(dp);
444 break;
445 case 2:
446 reg = exynos_dp_get_lane2_link_training(dp);
447 break;
448 case 3:
449 reg = exynos_dp_get_lane3_link_training(dp);
450 break;
451 default:
452 WARN_ON(1);
453 return 0;
454 }
455
456 return reg;
457 }
458
exynos_dp_reduce_link_rate(struct exynos_dp_device * dp)459 static void exynos_dp_reduce_link_rate(struct exynos_dp_device *dp)
460 {
461 exynos_dp_training_pattern_dis(dp);
462 exynos_dp_set_enhanced_mode(dp);
463
464 dp->link_train.lt_state = FAILED;
465 }
466
exynos_dp_get_adjust_training_lane(struct exynos_dp_device * dp,u8 adjust_request[2])467 static void exynos_dp_get_adjust_training_lane(struct exynos_dp_device *dp,
468 u8 adjust_request[2])
469 {
470 int lane, lane_count;
471 u8 voltage_swing, pre_emphasis, training_lane;
472
473 lane_count = dp->link_train.lane_count;
474 for (lane = 0; lane < lane_count; lane++) {
475 voltage_swing = exynos_dp_get_adjust_request_voltage(
476 adjust_request, lane);
477 pre_emphasis = exynos_dp_get_adjust_request_pre_emphasis(
478 adjust_request, lane);
479 training_lane = DPCD_VOLTAGE_SWING_SET(voltage_swing) |
480 DPCD_PRE_EMPHASIS_SET(pre_emphasis);
481
482 if (voltage_swing == VOLTAGE_LEVEL_3)
483 training_lane |= DP_TRAIN_MAX_SWING_REACHED;
484 if (pre_emphasis == PRE_EMPHASIS_LEVEL_3)
485 training_lane |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
486
487 dp->link_train.training_lane[lane] = training_lane;
488 }
489 }
490
exynos_dp_process_clock_recovery(struct exynos_dp_device * dp)491 static int exynos_dp_process_clock_recovery(struct exynos_dp_device *dp)
492 {
493 int lane, lane_count, retval;
494 u8 voltage_swing, pre_emphasis, training_lane;
495 u8 link_status[2], adjust_request[2];
496
497 usleep_range(100, 101);
498
499 lane_count = dp->link_train.lane_count;
500
501 retval = exynos_dp_read_bytes_from_dpcd(dp,
502 DP_LANE0_1_STATUS, 2, link_status);
503 if (retval)
504 return retval;
505
506 retval = exynos_dp_read_bytes_from_dpcd(dp,
507 DP_ADJUST_REQUEST_LANE0_1, 2, adjust_request);
508 if (retval)
509 return retval;
510
511 if (exynos_dp_clock_recovery_ok(link_status, lane_count) == 0) {
512 /* set training pattern 2 for EQ */
513 exynos_dp_set_training_pattern(dp, TRAINING_PTN2);
514
515 retval = exynos_dp_write_byte_to_dpcd(dp,
516 DP_TRAINING_PATTERN_SET,
517 DP_LINK_SCRAMBLING_DISABLE |
518 DP_TRAINING_PATTERN_2);
519 if (retval)
520 return retval;
521
522 dev_info(dp->dev, "Link Training Clock Recovery success\n");
523 dp->link_train.lt_state = EQUALIZER_TRAINING;
524 } else {
525 for (lane = 0; lane < lane_count; lane++) {
526 training_lane = exynos_dp_get_lane_link_training(
527 dp, lane);
528 voltage_swing = exynos_dp_get_adjust_request_voltage(
529 adjust_request, lane);
530 pre_emphasis = exynos_dp_get_adjust_request_pre_emphasis(
531 adjust_request, lane);
532
533 if (DPCD_VOLTAGE_SWING_GET(training_lane) ==
534 voltage_swing &&
535 DPCD_PRE_EMPHASIS_GET(training_lane) ==
536 pre_emphasis)
537 dp->link_train.cr_loop[lane]++;
538
539 if (dp->link_train.cr_loop[lane] == MAX_CR_LOOP ||
540 voltage_swing == VOLTAGE_LEVEL_3 ||
541 pre_emphasis == PRE_EMPHASIS_LEVEL_3) {
542 dev_err(dp->dev, "CR Max reached (%d,%d,%d)\n",
543 dp->link_train.cr_loop[lane],
544 voltage_swing, pre_emphasis);
545 exynos_dp_reduce_link_rate(dp);
546 return -EIO;
547 }
548 }
549 }
550
551 exynos_dp_get_adjust_training_lane(dp, adjust_request);
552
553 for (lane = 0; lane < lane_count; lane++)
554 exynos_dp_set_lane_link_training(dp,
555 dp->link_train.training_lane[lane], lane);
556
557 retval = exynos_dp_write_bytes_to_dpcd(dp,
558 DP_TRAINING_LANE0_SET, lane_count,
559 dp->link_train.training_lane);
560 if (retval)
561 return retval;
562
563 return retval;
564 }
565
exynos_dp_process_equalizer_training(struct exynos_dp_device * dp)566 static int exynos_dp_process_equalizer_training(struct exynos_dp_device *dp)
567 {
568 int lane, lane_count, retval;
569 u32 reg;
570 u8 link_align, link_status[2], adjust_request[2];
571
572 usleep_range(400, 401);
573
574 lane_count = dp->link_train.lane_count;
575
576 retval = exynos_dp_read_bytes_from_dpcd(dp,
577 DP_LANE0_1_STATUS, 2, link_status);
578 if (retval)
579 return retval;
580
581 if (exynos_dp_clock_recovery_ok(link_status, lane_count)) {
582 exynos_dp_reduce_link_rate(dp);
583 return -EIO;
584 }
585
586 retval = exynos_dp_read_bytes_from_dpcd(dp,
587 DP_ADJUST_REQUEST_LANE0_1, 2, adjust_request);
588 if (retval)
589 return retval;
590
591 retval = exynos_dp_read_byte_from_dpcd(dp,
592 DP_LANE_ALIGN_STATUS_UPDATED, &link_align);
593 if (retval)
594 return retval;
595
596 exynos_dp_get_adjust_training_lane(dp, adjust_request);
597
598 if (!exynos_dp_channel_eq_ok(link_status, link_align, lane_count)) {
599 /* traing pattern Set to Normal */
600 exynos_dp_training_pattern_dis(dp);
601
602 dev_info(dp->dev, "Link Training success!\n");
603
604 exynos_dp_get_link_bandwidth(dp, ®);
605 dp->link_train.link_rate = reg;
606 dev_dbg(dp->dev, "final bandwidth = %.2x\n",
607 dp->link_train.link_rate);
608
609 exynos_dp_get_lane_count(dp, ®);
610 dp->link_train.lane_count = reg;
611 dev_dbg(dp->dev, "final lane count = %.2x\n",
612 dp->link_train.lane_count);
613
614 /* set enhanced mode if available */
615 exynos_dp_set_enhanced_mode(dp);
616 dp->link_train.lt_state = FINISHED;
617
618 return 0;
619 }
620
621 /* not all locked */
622 dp->link_train.eq_loop++;
623
624 if (dp->link_train.eq_loop > MAX_EQ_LOOP) {
625 dev_err(dp->dev, "EQ Max loop\n");
626 exynos_dp_reduce_link_rate(dp);
627 return -EIO;
628 }
629
630 for (lane = 0; lane < lane_count; lane++)
631 exynos_dp_set_lane_link_training(dp,
632 dp->link_train.training_lane[lane], lane);
633
634 retval = exynos_dp_write_bytes_to_dpcd(dp, DP_TRAINING_LANE0_SET,
635 lane_count, dp->link_train.training_lane);
636
637 return retval;
638 }
639
exynos_dp_get_max_rx_bandwidth(struct exynos_dp_device * dp,u8 * bandwidth)640 static void exynos_dp_get_max_rx_bandwidth(struct exynos_dp_device *dp,
641 u8 *bandwidth)
642 {
643 u8 data;
644
645 /*
646 * For DP rev.1.1, Maximum link rate of Main Link lanes
647 * 0x06 = 1.62 Gbps, 0x0a = 2.7 Gbps
648 */
649 exynos_dp_read_byte_from_dpcd(dp, DP_MAX_LINK_RATE, &data);
650 *bandwidth = data;
651 }
652
exynos_dp_get_max_rx_lane_count(struct exynos_dp_device * dp,u8 * lane_count)653 static void exynos_dp_get_max_rx_lane_count(struct exynos_dp_device *dp,
654 u8 *lane_count)
655 {
656 u8 data;
657
658 /*
659 * For DP rev.1.1, Maximum number of Main Link lanes
660 * 0x01 = 1 lane, 0x02 = 2 lanes, 0x04 = 4 lanes
661 */
662 exynos_dp_read_byte_from_dpcd(dp, DP_MAX_LANE_COUNT, &data);
663 *lane_count = DPCD_MAX_LANE_COUNT(data);
664 }
665
exynos_dp_init_training(struct exynos_dp_device * dp,enum link_lane_count_type max_lane,enum link_rate_type max_rate)666 static void exynos_dp_init_training(struct exynos_dp_device *dp,
667 enum link_lane_count_type max_lane,
668 enum link_rate_type max_rate)
669 {
670 /*
671 * MACRO_RST must be applied after the PLL_LOCK to avoid
672 * the DP inter pair skew issue for at least 10 us
673 */
674 exynos_dp_reset_macro(dp);
675
676 /* Initialize by reading RX's DPCD */
677 exynos_dp_get_max_rx_bandwidth(dp, &dp->link_train.link_rate);
678 exynos_dp_get_max_rx_lane_count(dp, &dp->link_train.lane_count);
679
680 if ((dp->link_train.link_rate != LINK_RATE_1_62GBPS) &&
681 (dp->link_train.link_rate != LINK_RATE_2_70GBPS)) {
682 dev_err(dp->dev, "Rx Max Link Rate is abnormal :%x !\n",
683 dp->link_train.link_rate);
684 dp->link_train.link_rate = LINK_RATE_1_62GBPS;
685 }
686
687 if (dp->link_train.lane_count == 0) {
688 dev_err(dp->dev, "Rx Max Lane count is abnormal :%x !\n",
689 dp->link_train.lane_count);
690 dp->link_train.lane_count = (u8)LANE_COUNT1;
691 }
692
693 /* Setup TX lane count & rate */
694 if (dp->link_train.lane_count > max_lane)
695 dp->link_train.lane_count = max_lane;
696 if (dp->link_train.link_rate > max_rate)
697 dp->link_train.link_rate = max_rate;
698
699 /* All DP analog module power up */
700 exynos_dp_set_analog_power_down(dp, POWER_ALL, 0);
701 }
702
exynos_dp_sw_link_training(struct exynos_dp_device * dp)703 static int exynos_dp_sw_link_training(struct exynos_dp_device *dp)
704 {
705 int retval = 0, training_finished = 0;
706
707 dp->link_train.lt_state = START;
708
709 /* Process here */
710 while (!retval && !training_finished) {
711 switch (dp->link_train.lt_state) {
712 case START:
713 retval = exynos_dp_link_start(dp);
714 if (retval)
715 dev_err(dp->dev, "LT link start failed!\n");
716 break;
717 case CLOCK_RECOVERY:
718 retval = exynos_dp_process_clock_recovery(dp);
719 if (retval)
720 dev_err(dp->dev, "LT CR failed!\n");
721 break;
722 case EQUALIZER_TRAINING:
723 retval = exynos_dp_process_equalizer_training(dp);
724 if (retval)
725 dev_err(dp->dev, "LT EQ failed!\n");
726 break;
727 case FINISHED:
728 training_finished = 1;
729 break;
730 case FAILED:
731 return -EREMOTEIO;
732 }
733 }
734 if (retval)
735 dev_err(dp->dev, "eDP link training failed (%d)\n", retval);
736
737 return retval;
738 }
739
exynos_dp_set_link_train(struct exynos_dp_device * dp,u32 count,u32 bwtype)740 static int exynos_dp_set_link_train(struct exynos_dp_device *dp,
741 u32 count,
742 u32 bwtype)
743 {
744 int i;
745 int retval;
746
747 for (i = 0; i < DP_TIMEOUT_LOOP_COUNT; i++) {
748 exynos_dp_init_training(dp, count, bwtype);
749 retval = exynos_dp_sw_link_training(dp);
750 if (retval == 0)
751 break;
752
753 usleep_range(100, 110);
754 }
755
756 return retval;
757 }
758
exynos_dp_config_video(struct exynos_dp_device * dp)759 static int exynos_dp_config_video(struct exynos_dp_device *dp)
760 {
761 int retval = 0;
762 int timeout_loop = 0;
763 int done_count = 0;
764
765 exynos_dp_config_video_slave_mode(dp);
766
767 exynos_dp_set_video_color_format(dp);
768
769 if (exynos_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) {
770 dev_err(dp->dev, "PLL is not locked yet.\n");
771 return -EINVAL;
772 }
773
774 for (;;) {
775 timeout_loop++;
776 if (exynos_dp_is_slave_video_stream_clock_on(dp) == 0)
777 break;
778 if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {
779 dev_err(dp->dev, "Timeout of video streamclk ok\n");
780 return -ETIMEDOUT;
781 }
782
783 usleep_range(1, 2);
784 }
785
786 /* Set to use the register calculated M/N video */
787 exynos_dp_set_video_cr_mn(dp, CALCULATED_M, 0, 0);
788
789 /* For video bist, Video timing must be generated by register */
790 exynos_dp_set_video_timing_mode(dp, VIDEO_TIMING_FROM_CAPTURE);
791
792 /* Disable video mute */
793 exynos_dp_enable_video_mute(dp, 0);
794
795 /* Configure video slave mode */
796 exynos_dp_enable_video_master(dp, 0);
797
798 /* Enable video */
799 exynos_dp_start_video(dp);
800
801 timeout_loop = 0;
802
803 for (;;) {
804 timeout_loop++;
805 if (exynos_dp_is_video_stream_on(dp) == 0) {
806 done_count++;
807 if (done_count > 10)
808 break;
809 } else if (done_count) {
810 done_count = 0;
811 }
812 if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {
813 dev_err(dp->dev, "Timeout of video streamclk ok\n");
814 return -ETIMEDOUT;
815 }
816
817 usleep_range(1000, 1001);
818 }
819
820 if (retval != 0)
821 dev_err(dp->dev, "Video stream is not detected!\n");
822
823 return retval;
824 }
825
exynos_dp_enable_scramble(struct exynos_dp_device * dp,bool enable)826 static void exynos_dp_enable_scramble(struct exynos_dp_device *dp, bool enable)
827 {
828 u8 data;
829
830 if (enable) {
831 exynos_dp_enable_scrambling(dp);
832
833 exynos_dp_read_byte_from_dpcd(dp,
834 DP_TRAINING_PATTERN_SET,
835 &data);
836 exynos_dp_write_byte_to_dpcd(dp,
837 DP_TRAINING_PATTERN_SET,
838 (u8)(data & ~DP_LINK_SCRAMBLING_DISABLE));
839 } else {
840 exynos_dp_disable_scrambling(dp);
841
842 exynos_dp_read_byte_from_dpcd(dp,
843 DP_TRAINING_PATTERN_SET,
844 &data);
845 exynos_dp_write_byte_to_dpcd(dp,
846 DP_TRAINING_PATTERN_SET,
847 (u8)(data | DP_LINK_SCRAMBLING_DISABLE));
848 }
849 }
850
exynos_dp_irq_handler(int irq,void * arg)851 static irqreturn_t exynos_dp_irq_handler(int irq, void *arg)
852 {
853 struct exynos_dp_device *dp = arg;
854
855 enum dp_irq_type irq_type;
856
857 irq_type = exynos_dp_get_irq_type(dp);
858 switch (irq_type) {
859 case DP_IRQ_TYPE_HP_CABLE_IN:
860 dev_dbg(dp->dev, "Received irq - cable in\n");
861 schedule_work(&dp->hotplug_work);
862 exynos_dp_clear_hotplug_interrupts(dp);
863 break;
864 case DP_IRQ_TYPE_HP_CABLE_OUT:
865 dev_dbg(dp->dev, "Received irq - cable out\n");
866 exynos_dp_clear_hotplug_interrupts(dp);
867 break;
868 case DP_IRQ_TYPE_HP_CHANGE:
869 /*
870 * We get these change notifications once in a while, but there
871 * is nothing we can do with them. Just ignore it for now and
872 * only handle cable changes.
873 */
874 dev_dbg(dp->dev, "Received irq - hotplug change; ignoring.\n");
875 exynos_dp_clear_hotplug_interrupts(dp);
876 break;
877 default:
878 dev_err(dp->dev, "Received irq - unknown type!\n");
879 break;
880 }
881 return IRQ_HANDLED;
882 }
883
exynos_dp_hotplug(struct work_struct * work)884 static void exynos_dp_hotplug(struct work_struct *work)
885 {
886 struct exynos_dp_device *dp;
887
888 dp = container_of(work, struct exynos_dp_device, hotplug_work);
889
890 if (dp->drm_dev)
891 drm_helper_hpd_irq_event(dp->drm_dev);
892 }
893
exynos_dp_commit(struct exynos_drm_display * display)894 static void exynos_dp_commit(struct exynos_drm_display *display)
895 {
896 struct exynos_dp_device *dp = display_to_dp(display);
897 int ret;
898
899 /* Keep the panel disabled while we configure video */
900 if (dp->panel) {
901 if (drm_panel_disable(dp->panel))
902 DRM_ERROR("failed to disable the panel\n");
903 }
904
905 ret = exynos_dp_detect_hpd(dp);
906 if (ret) {
907 /* Cable has been disconnected, we're done */
908 return;
909 }
910
911 ret = exynos_dp_handle_edid(dp);
912 if (ret) {
913 dev_err(dp->dev, "unable to handle edid\n");
914 return;
915 }
916
917 ret = exynos_dp_set_link_train(dp, dp->video_info->lane_count,
918 dp->video_info->link_rate);
919 if (ret) {
920 dev_err(dp->dev, "unable to do link train\n");
921 return;
922 }
923
924 exynos_dp_enable_scramble(dp, 1);
925 exynos_dp_enable_rx_to_enhanced_mode(dp, 1);
926 exynos_dp_enable_enhanced_mode(dp, 1);
927
928 exynos_dp_set_lane_count(dp, dp->video_info->lane_count);
929 exynos_dp_set_link_bandwidth(dp, dp->video_info->link_rate);
930
931 exynos_dp_init_video(dp);
932 ret = exynos_dp_config_video(dp);
933 if (ret)
934 dev_err(dp->dev, "unable to config video\n");
935
936 /* Safe to enable the panel now */
937 if (dp->panel) {
938 if (drm_panel_enable(dp->panel))
939 DRM_ERROR("failed to enable the panel\n");
940 }
941 }
942
exynos_dp_detect(struct drm_connector * connector,bool force)943 static enum drm_connector_status exynos_dp_detect(
944 struct drm_connector *connector, bool force)
945 {
946 return connector_status_connected;
947 }
948
exynos_dp_connector_destroy(struct drm_connector * connector)949 static void exynos_dp_connector_destroy(struct drm_connector *connector)
950 {
951 drm_connector_unregister(connector);
952 drm_connector_cleanup(connector);
953 }
954
955 static struct drm_connector_funcs exynos_dp_connector_funcs = {
956 .dpms = drm_helper_connector_dpms,
957 .fill_modes = drm_helper_probe_single_connector_modes,
958 .detect = exynos_dp_detect,
959 .destroy = exynos_dp_connector_destroy,
960 };
961
exynos_dp_get_modes(struct drm_connector * connector)962 static int exynos_dp_get_modes(struct drm_connector *connector)
963 {
964 struct exynos_dp_device *dp = ctx_from_connector(connector);
965 struct drm_display_mode *mode;
966
967 if (dp->panel)
968 return drm_panel_get_modes(dp->panel);
969
970 mode = drm_mode_create(connector->dev);
971 if (!mode) {
972 DRM_ERROR("failed to create a new display mode.\n");
973 return 0;
974 }
975
976 drm_display_mode_from_videomode(&dp->priv.vm, mode);
977 mode->width_mm = dp->priv.width_mm;
978 mode->height_mm = dp->priv.height_mm;
979 connector->display_info.width_mm = mode->width_mm;
980 connector->display_info.height_mm = mode->height_mm;
981
982 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
983 drm_mode_set_name(mode);
984 drm_mode_probed_add(connector, mode);
985
986 return 1;
987 }
988
exynos_dp_best_encoder(struct drm_connector * connector)989 static struct drm_encoder *exynos_dp_best_encoder(
990 struct drm_connector *connector)
991 {
992 struct exynos_dp_device *dp = ctx_from_connector(connector);
993
994 return dp->encoder;
995 }
996
997 static struct drm_connector_helper_funcs exynos_dp_connector_helper_funcs = {
998 .get_modes = exynos_dp_get_modes,
999 .best_encoder = exynos_dp_best_encoder,
1000 };
1001
1002 /* returns the number of bridges attached */
exynos_drm_attach_lcd_bridge(struct exynos_dp_device * dp,struct drm_encoder * encoder)1003 static int exynos_drm_attach_lcd_bridge(struct exynos_dp_device *dp,
1004 struct drm_encoder *encoder)
1005 {
1006 int ret;
1007
1008 encoder->bridge = dp->bridge;
1009 dp->bridge->encoder = encoder;
1010 ret = drm_bridge_attach(encoder->dev, dp->bridge);
1011 if (ret) {
1012 DRM_ERROR("Failed to attach bridge to drm\n");
1013 return ret;
1014 }
1015
1016 return 0;
1017 }
1018
exynos_dp_create_connector(struct exynos_drm_display * display,struct drm_encoder * encoder)1019 static int exynos_dp_create_connector(struct exynos_drm_display *display,
1020 struct drm_encoder *encoder)
1021 {
1022 struct exynos_dp_device *dp = display_to_dp(display);
1023 struct drm_connector *connector = &dp->connector;
1024 int ret;
1025
1026 dp->encoder = encoder;
1027
1028 /* Pre-empt DP connector creation if there's a bridge */
1029 if (dp->bridge) {
1030 ret = exynos_drm_attach_lcd_bridge(dp, encoder);
1031 if (!ret)
1032 return 0;
1033 }
1034
1035 connector->polled = DRM_CONNECTOR_POLL_HPD;
1036
1037 ret = drm_connector_init(dp->drm_dev, connector,
1038 &exynos_dp_connector_funcs, DRM_MODE_CONNECTOR_eDP);
1039 if (ret) {
1040 DRM_ERROR("Failed to initialize connector with drm\n");
1041 return ret;
1042 }
1043
1044 drm_connector_helper_add(connector, &exynos_dp_connector_helper_funcs);
1045 drm_connector_register(connector);
1046 drm_mode_connector_attach_encoder(connector, encoder);
1047
1048 if (dp->panel)
1049 ret = drm_panel_attach(dp->panel, &dp->connector);
1050
1051 return ret;
1052 }
1053
exynos_dp_phy_init(struct exynos_dp_device * dp)1054 static void exynos_dp_phy_init(struct exynos_dp_device *dp)
1055 {
1056 if (dp->phy)
1057 phy_power_on(dp->phy);
1058 }
1059
exynos_dp_phy_exit(struct exynos_dp_device * dp)1060 static void exynos_dp_phy_exit(struct exynos_dp_device *dp)
1061 {
1062 if (dp->phy)
1063 phy_power_off(dp->phy);
1064 }
1065
exynos_dp_poweron(struct exynos_dp_device * dp)1066 static void exynos_dp_poweron(struct exynos_dp_device *dp)
1067 {
1068 struct exynos_drm_crtc *crtc = dp_to_crtc(dp);
1069
1070 if (dp->dpms_mode == DRM_MODE_DPMS_ON)
1071 return;
1072
1073 if (dp->panel) {
1074 if (drm_panel_prepare(dp->panel)) {
1075 DRM_ERROR("failed to setup the panel\n");
1076 return;
1077 }
1078 }
1079
1080 if (crtc->ops->clock_enable)
1081 crtc->ops->clock_enable(dp_to_crtc(dp), true);
1082
1083 clk_prepare_enable(dp->clock);
1084 exynos_dp_phy_init(dp);
1085 exynos_dp_init_dp(dp);
1086 enable_irq(dp->irq);
1087 exynos_dp_commit(&dp->display);
1088 }
1089
exynos_dp_poweroff(struct exynos_dp_device * dp)1090 static void exynos_dp_poweroff(struct exynos_dp_device *dp)
1091 {
1092 struct exynos_drm_crtc *crtc = dp_to_crtc(dp);
1093
1094 if (dp->dpms_mode != DRM_MODE_DPMS_ON)
1095 return;
1096
1097 if (dp->panel) {
1098 if (drm_panel_disable(dp->panel)) {
1099 DRM_ERROR("failed to disable the panel\n");
1100 return;
1101 }
1102 }
1103
1104 disable_irq(dp->irq);
1105 flush_work(&dp->hotplug_work);
1106 exynos_dp_phy_exit(dp);
1107 clk_disable_unprepare(dp->clock);
1108
1109 if (crtc->ops->clock_enable)
1110 crtc->ops->clock_enable(dp_to_crtc(dp), false);
1111
1112 if (dp->panel) {
1113 if (drm_panel_unprepare(dp->panel))
1114 DRM_ERROR("failed to turnoff the panel\n");
1115 }
1116 }
1117
exynos_dp_dpms(struct exynos_drm_display * display,int mode)1118 static void exynos_dp_dpms(struct exynos_drm_display *display, int mode)
1119 {
1120 struct exynos_dp_device *dp = display_to_dp(display);
1121
1122 switch (mode) {
1123 case DRM_MODE_DPMS_ON:
1124 exynos_dp_poweron(dp);
1125 break;
1126 case DRM_MODE_DPMS_STANDBY:
1127 case DRM_MODE_DPMS_SUSPEND:
1128 case DRM_MODE_DPMS_OFF:
1129 exynos_dp_poweroff(dp);
1130 break;
1131 default:
1132 break;
1133 }
1134 dp->dpms_mode = mode;
1135 }
1136
1137 static struct exynos_drm_display_ops exynos_dp_display_ops = {
1138 .create_connector = exynos_dp_create_connector,
1139 .dpms = exynos_dp_dpms,
1140 .commit = exynos_dp_commit,
1141 };
1142
exynos_dp_dt_parse_pdata(struct device * dev)1143 static struct video_info *exynos_dp_dt_parse_pdata(struct device *dev)
1144 {
1145 struct device_node *dp_node = dev->of_node;
1146 struct video_info *dp_video_config;
1147
1148 dp_video_config = devm_kzalloc(dev,
1149 sizeof(*dp_video_config), GFP_KERNEL);
1150 if (!dp_video_config)
1151 return ERR_PTR(-ENOMEM);
1152
1153 dp_video_config->h_sync_polarity =
1154 of_property_read_bool(dp_node, "hsync-active-high");
1155
1156 dp_video_config->v_sync_polarity =
1157 of_property_read_bool(dp_node, "vsync-active-high");
1158
1159 dp_video_config->interlaced =
1160 of_property_read_bool(dp_node, "interlaced");
1161
1162 if (of_property_read_u32(dp_node, "samsung,color-space",
1163 &dp_video_config->color_space)) {
1164 dev_err(dev, "failed to get color-space\n");
1165 return ERR_PTR(-EINVAL);
1166 }
1167
1168 if (of_property_read_u32(dp_node, "samsung,dynamic-range",
1169 &dp_video_config->dynamic_range)) {
1170 dev_err(dev, "failed to get dynamic-range\n");
1171 return ERR_PTR(-EINVAL);
1172 }
1173
1174 if (of_property_read_u32(dp_node, "samsung,ycbcr-coeff",
1175 &dp_video_config->ycbcr_coeff)) {
1176 dev_err(dev, "failed to get ycbcr-coeff\n");
1177 return ERR_PTR(-EINVAL);
1178 }
1179
1180 if (of_property_read_u32(dp_node, "samsung,color-depth",
1181 &dp_video_config->color_depth)) {
1182 dev_err(dev, "failed to get color-depth\n");
1183 return ERR_PTR(-EINVAL);
1184 }
1185
1186 if (of_property_read_u32(dp_node, "samsung,link-rate",
1187 &dp_video_config->link_rate)) {
1188 dev_err(dev, "failed to get link-rate\n");
1189 return ERR_PTR(-EINVAL);
1190 }
1191
1192 if (of_property_read_u32(dp_node, "samsung,lane-count",
1193 &dp_video_config->lane_count)) {
1194 dev_err(dev, "failed to get lane-count\n");
1195 return ERR_PTR(-EINVAL);
1196 }
1197
1198 return dp_video_config;
1199 }
1200
exynos_dp_dt_parse_panel(struct exynos_dp_device * dp)1201 static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
1202 {
1203 int ret;
1204
1205 ret = of_get_videomode(dp->dev->of_node, &dp->priv.vm,
1206 OF_USE_NATIVE_MODE);
1207 if (ret) {
1208 DRM_ERROR("failed: of_get_videomode() : %d\n", ret);
1209 return ret;
1210 }
1211 return 0;
1212 }
1213
exynos_dp_bind(struct device * dev,struct device * master,void * data)1214 static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
1215 {
1216 struct exynos_dp_device *dp = dev_get_drvdata(dev);
1217 struct platform_device *pdev = to_platform_device(dev);
1218 struct drm_device *drm_dev = data;
1219 struct resource *res;
1220 unsigned int irq_flags;
1221 int ret = 0;
1222
1223 dp->dev = &pdev->dev;
1224 dp->dpms_mode = DRM_MODE_DPMS_OFF;
1225
1226 dp->video_info = exynos_dp_dt_parse_pdata(&pdev->dev);
1227 if (IS_ERR(dp->video_info))
1228 return PTR_ERR(dp->video_info);
1229
1230 dp->phy = devm_phy_get(dp->dev, "dp");
1231 if (IS_ERR(dp->phy)) {
1232 dev_err(dp->dev, "no DP phy configured\n");
1233 ret = PTR_ERR(dp->phy);
1234 if (ret) {
1235 /*
1236 * phy itself is not enabled, so we can move forward
1237 * assigning NULL to phy pointer.
1238 */
1239 if (ret == -ENOSYS || ret == -ENODEV)
1240 dp->phy = NULL;
1241 else
1242 return ret;
1243 }
1244 }
1245
1246 if (!dp->panel && !dp->bridge) {
1247 ret = exynos_dp_dt_parse_panel(dp);
1248 if (ret)
1249 return ret;
1250 }
1251
1252 dp->clock = devm_clk_get(&pdev->dev, "dp");
1253 if (IS_ERR(dp->clock)) {
1254 dev_err(&pdev->dev, "failed to get clock\n");
1255 return PTR_ERR(dp->clock);
1256 }
1257
1258 clk_prepare_enable(dp->clock);
1259
1260 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1261
1262 dp->reg_base = devm_ioremap_resource(&pdev->dev, res);
1263 if (IS_ERR(dp->reg_base))
1264 return PTR_ERR(dp->reg_base);
1265
1266 dp->hpd_gpio = of_get_named_gpio(dev->of_node, "samsung,hpd-gpio", 0);
1267
1268 if (gpio_is_valid(dp->hpd_gpio)) {
1269 /*
1270 * Set up the hotplug GPIO from the device tree as an interrupt.
1271 * Simply specifying a different interrupt in the device tree
1272 * doesn't work since we handle hotplug rather differently when
1273 * using a GPIO. We also need the actual GPIO specifier so
1274 * that we can get the current state of the GPIO.
1275 */
1276 ret = devm_gpio_request_one(&pdev->dev, dp->hpd_gpio, GPIOF_IN,
1277 "hpd_gpio");
1278 if (ret) {
1279 dev_err(&pdev->dev, "failed to get hpd gpio\n");
1280 return ret;
1281 }
1282 dp->irq = gpio_to_irq(dp->hpd_gpio);
1283 irq_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
1284 } else {
1285 dp->hpd_gpio = -ENODEV;
1286 dp->irq = platform_get_irq(pdev, 0);
1287 irq_flags = 0;
1288 }
1289
1290 if (dp->irq == -ENXIO) {
1291 dev_err(&pdev->dev, "failed to get irq\n");
1292 return -ENODEV;
1293 }
1294
1295 INIT_WORK(&dp->hotplug_work, exynos_dp_hotplug);
1296
1297 exynos_dp_phy_init(dp);
1298
1299 exynos_dp_init_dp(dp);
1300
1301 ret = devm_request_irq(&pdev->dev, dp->irq, exynos_dp_irq_handler,
1302 irq_flags, "exynos-dp", dp);
1303 if (ret) {
1304 dev_err(&pdev->dev, "failed to request irq\n");
1305 return ret;
1306 }
1307 disable_irq(dp->irq);
1308
1309 dp->drm_dev = drm_dev;
1310
1311 return exynos_drm_create_enc_conn(drm_dev, &dp->display);
1312 }
1313
exynos_dp_unbind(struct device * dev,struct device * master,void * data)1314 static void exynos_dp_unbind(struct device *dev, struct device *master,
1315 void *data)
1316 {
1317 struct exynos_dp_device *dp = dev_get_drvdata(dev);
1318
1319 exynos_dp_dpms(&dp->display, DRM_MODE_DPMS_OFF);
1320 }
1321
1322 static const struct component_ops exynos_dp_ops = {
1323 .bind = exynos_dp_bind,
1324 .unbind = exynos_dp_unbind,
1325 };
1326
exynos_dp_probe(struct platform_device * pdev)1327 static int exynos_dp_probe(struct platform_device *pdev)
1328 {
1329 struct device *dev = &pdev->dev;
1330 struct device_node *panel_node, *bridge_node, *endpoint;
1331 struct exynos_dp_device *dp;
1332 int ret;
1333
1334 dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
1335 GFP_KERNEL);
1336 if (!dp)
1337 return -ENOMEM;
1338
1339 dp->display.type = EXYNOS_DISPLAY_TYPE_LCD;
1340 dp->display.ops = &exynos_dp_display_ops;
1341 platform_set_drvdata(pdev, dp);
1342
1343 ret = exynos_drm_component_add(&pdev->dev, EXYNOS_DEVICE_TYPE_CONNECTOR,
1344 dp->display.type);
1345 if (ret)
1346 return ret;
1347
1348 panel_node = of_parse_phandle(dev->of_node, "panel", 0);
1349 if (panel_node) {
1350 dp->panel = of_drm_find_panel(panel_node);
1351 of_node_put(panel_node);
1352 if (!dp->panel)
1353 return -EPROBE_DEFER;
1354 }
1355
1356 endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
1357 if (endpoint) {
1358 bridge_node = of_graph_get_remote_port_parent(endpoint);
1359 if (bridge_node) {
1360 dp->bridge = of_drm_find_bridge(bridge_node);
1361 of_node_put(bridge_node);
1362 if (!dp->bridge)
1363 return -EPROBE_DEFER;
1364 } else
1365 return -EPROBE_DEFER;
1366 }
1367
1368 ret = component_add(&pdev->dev, &exynos_dp_ops);
1369 if (ret)
1370 exynos_drm_component_del(&pdev->dev,
1371 EXYNOS_DEVICE_TYPE_CONNECTOR);
1372
1373 return ret;
1374 }
1375
exynos_dp_remove(struct platform_device * pdev)1376 static int exynos_dp_remove(struct platform_device *pdev)
1377 {
1378 component_del(&pdev->dev, &exynos_dp_ops);
1379 exynos_drm_component_del(&pdev->dev, EXYNOS_DEVICE_TYPE_CONNECTOR);
1380
1381 return 0;
1382 }
1383
1384 #ifdef CONFIG_PM_SLEEP
exynos_dp_suspend(struct device * dev)1385 static int exynos_dp_suspend(struct device *dev)
1386 {
1387 struct exynos_dp_device *dp = dev_get_drvdata(dev);
1388
1389 exynos_dp_dpms(&dp->display, DRM_MODE_DPMS_OFF);
1390 return 0;
1391 }
1392
exynos_dp_resume(struct device * dev)1393 static int exynos_dp_resume(struct device *dev)
1394 {
1395 struct exynos_dp_device *dp = dev_get_drvdata(dev);
1396
1397 exynos_dp_dpms(&dp->display, DRM_MODE_DPMS_ON);
1398 return 0;
1399 }
1400 #endif
1401
1402 static const struct dev_pm_ops exynos_dp_pm_ops = {
1403 SET_SYSTEM_SLEEP_PM_OPS(exynos_dp_suspend, exynos_dp_resume)
1404 };
1405
1406 static const struct of_device_id exynos_dp_match[] = {
1407 { .compatible = "samsung,exynos5-dp" },
1408 {},
1409 };
1410 MODULE_DEVICE_TABLE(of, exynos_dp_match);
1411
1412 struct platform_driver dp_driver = {
1413 .probe = exynos_dp_probe,
1414 .remove = exynos_dp_remove,
1415 .driver = {
1416 .name = "exynos-dp",
1417 .owner = THIS_MODULE,
1418 .pm = &exynos_dp_pm_ops,
1419 .of_match_table = exynos_dp_match,
1420 },
1421 };
1422
1423 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
1424 MODULE_DESCRIPTION("Samsung SoC DP Driver");
1425 MODULE_LICENSE("GPL v2");
1426