tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/slab.h>
16#include <linux/err.h>
17#include <linux/clk.h>
18#include <linux/io.h>
19#include <linux/interrupt.h>
20#include <linux/delay.h>
21
22#include <video/exynos_dp.h>
23
24#include <plat/cpu.h>
25
26#include "exynos_dp_core.h"
27
28static int exynos_dp_init_dp(struct exynos_dp_device *dp)
29{
30 exynos_dp_reset(dp);
31
32 /* SW defined function Normal operation */
33 exynos_dp_enable_sw_function(dp);
34
35 exynos_dp_config_interrupt(dp);
36 exynos_dp_init_analog_func(dp);
37
38 exynos_dp_init_hpd(dp);
39 exynos_dp_init_aux(dp);
40
41 return 0;
42}
43
44static int exynos_dp_detect_hpd(struct exynos_dp_device *dp)
45{
46 int timeout_loop = 0;
47
48 exynos_dp_init_hpd(dp);
49
50 udelay(200);
51
52 while (exynos_dp_get_plug_in_status(dp) != 0) {
53 timeout_loop++;
54 if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {
55 dev_err(dp->dev, "failed to get hpd plug status\n");
56 return -ETIMEDOUT;
57 }
58 udelay(10);
59 }
60
61 return 0;
62}
63
64static unsigned char exynos_dp_calc_edid_check_sum(unsigned char *edid_data)
65{
66 int i;
67 unsigned char sum = 0;
68
69 for (i = 0; i < EDID_BLOCK_LENGTH; i++)
70 sum = sum + edid_data[i];
71
72 return sum;
73}
74
75static int exynos_dp_read_edid(struct exynos_dp_device *dp)
76{
77 unsigned char edid[EDID_BLOCK_LENGTH * 2];
78 unsigned int extend_block = 0;
79 unsigned char sum;
80 unsigned char test_vector;
81 int retval;
82
83 /*
84 * EDID device address is 0x50.
85 * However, if necessary, you must have set upper address
86 * into E-EDID in I2C device, 0x30.
87 */
88
89 /* Read Extension Flag, Number of 128-byte EDID extension blocks */
90 exynos_dp_read_byte_from_i2c(dp, I2C_EDID_DEVICE_ADDR,
91 EDID_EXTENSION_FLAG,
92 &extend_block);
93
94 if (extend_block > 0) {
95 dev_dbg(dp->dev, "EDID data includes a single extension!\n");
96
97 /* Read EDID data */
98 retval = exynos_dp_read_bytes_from_i2c(dp, I2C_EDID_DEVICE_ADDR,
99 EDID_HEADER_PATTERN,
100 EDID_BLOCK_LENGTH,
101 &edid[EDID_HEADER_PATTERN]);
102 if (retval != 0) {
103 dev_err(dp->dev, "EDID Read failed!\n");
104 return -EIO;
105 }
106 sum = exynos_dp_calc_edid_check_sum(edid);
107 if (sum != 0) {
108 dev_err(dp->dev, "EDID bad checksum!\n");
109 return -EIO;
110 }
111
112 /* Read additional EDID data */
113 retval = exynos_dp_read_bytes_from_i2c(dp,
114 I2C_EDID_DEVICE_ADDR,
115 EDID_BLOCK_LENGTH,
116 EDID_BLOCK_LENGTH,
117 &edid[EDID_BLOCK_LENGTH]);
118 if (retval != 0) {
119 dev_err(dp->dev, "EDID Read failed!\n");
120 return -EIO;
121 }
122 sum = exynos_dp_calc_edid_check_sum(&edid[EDID_BLOCK_LENGTH]);
123 if (sum != 0) {
124 dev_err(dp->dev, "EDID bad checksum!\n");
125 return -EIO;
126 }
127
128 exynos_dp_read_byte_from_dpcd(dp, DPCD_ADDR_TEST_REQUEST,
129 &test_vector);
130 if (test_vector & DPCD_TEST_EDID_READ) {
131 exynos_dp_write_byte_to_dpcd(dp,
132 DPCD_ADDR_TEST_EDID_CHECKSUM,
133 edid[EDID_BLOCK_LENGTH + EDID_CHECKSUM]);
134 exynos_dp_write_byte_to_dpcd(dp,
135 DPCD_ADDR_TEST_RESPONSE,
136 DPCD_TEST_EDID_CHECKSUM_WRITE);
137 }
138 } else {
139 dev_info(dp->dev, "EDID data does not include any extensions.\n");
140
141 /* Read EDID data */
142 retval = exynos_dp_read_bytes_from_i2c(dp,
143 I2C_EDID_DEVICE_ADDR,
144 EDID_HEADER_PATTERN,
145 EDID_BLOCK_LENGTH,
146 &edid[EDID_HEADER_PATTERN]);
147 if (retval != 0) {
148 dev_err(dp->dev, "EDID Read failed!\n");
149 return -EIO;
150 }
151 sum = exynos_dp_calc_edid_check_sum(edid);
152 if (sum != 0) {
153 dev_err(dp->dev, "EDID bad checksum!\n");
154 return -EIO;
155 }
156
157 exynos_dp_read_byte_from_dpcd(dp,
158 DPCD_ADDR_TEST_REQUEST,
159 &test_vector);
160 if (test_vector & DPCD_TEST_EDID_READ) {
161 exynos_dp_write_byte_to_dpcd(dp,
162 DPCD_ADDR_TEST_EDID_CHECKSUM,
163 edid[EDID_CHECKSUM]);
164 exynos_dp_write_byte_to_dpcd(dp,
165 DPCD_ADDR_TEST_RESPONSE,
166 DPCD_TEST_EDID_CHECKSUM_WRITE);
167 }
168 }
169
170 dev_err(dp->dev, "EDID Read success!\n");
171 return 0;
172}
173
174static int exynos_dp_handle_edid(struct exynos_dp_device *dp)
175{
176 u8 buf[12];
177 int i;
178 int retval;
179
180 /* Read DPCD DPCD_ADDR_DPCD_REV~RECEIVE_PORT1_CAP_1 */
181 exynos_dp_read_bytes_from_dpcd(dp,
182 DPCD_ADDR_DPCD_REV,
183 12, buf);
184
185 /* Read EDID */
186 for (i = 0; i < 3; i++) {
187 retval = exynos_dp_read_edid(dp);
188 if (retval == 0)
189 break;
190 }
191
192 return retval;
193}
194
195static void exynos_dp_enable_rx_to_enhanced_mode(struct exynos_dp_device *dp,
196 bool enable)
197{
198 u8 data;
199
200 exynos_dp_read_byte_from_dpcd(dp, DPCD_ADDR_LANE_COUNT_SET, &data);
201
202 if (enable)
203 exynos_dp_write_byte_to_dpcd(dp, DPCD_ADDR_LANE_COUNT_SET,
204 DPCD_ENHANCED_FRAME_EN |
205 DPCD_LANE_COUNT_SET(data));
206 else
207 exynos_dp_write_byte_to_dpcd(dp, DPCD_ADDR_LANE_COUNT_SET,
208 DPCD_LANE_COUNT_SET(data));
209}
210
211static int exynos_dp_is_enhanced_mode_available(struct exynos_dp_device *dp)
212{
213 u8 data;
214 int retval;
215
216 exynos_dp_read_byte_from_dpcd(dp, DPCD_ADDR_MAX_LANE_COUNT, &data);
217 retval = DPCD_ENHANCED_FRAME_CAP(data);
218
219 return retval;
220}
221
222static void exynos_dp_set_enhanced_mode(struct exynos_dp_device *dp)
223{
224 u8 data;
225
226 data = exynos_dp_is_enhanced_mode_available(dp);
227 exynos_dp_enable_rx_to_enhanced_mode(dp, data);
228 exynos_dp_enable_enhanced_mode(dp, data);
229}
230
231static void exynos_dp_training_pattern_dis(struct exynos_dp_device *dp)
232{
233 exynos_dp_set_training_pattern(dp, DP_NONE);
234
235 exynos_dp_write_byte_to_dpcd(dp,
236 DPCD_ADDR_TRAINING_PATTERN_SET,
237 DPCD_TRAINING_PATTERN_DISABLED);
238}
239
240static void exynos_dp_set_lane_lane_pre_emphasis(struct exynos_dp_device *dp,
241 int pre_emphasis, int lane)
242{
243 switch (lane) {
244 case 0:
245 exynos_dp_set_lane0_pre_emphasis(dp, pre_emphasis);
246 break;
247 case 1:
248 exynos_dp_set_lane1_pre_emphasis(dp, pre_emphasis);
249 break;
250
251 case 2:
252 exynos_dp_set_lane2_pre_emphasis(dp, pre_emphasis);
253 break;
254
255 case 3:
256 exynos_dp_set_lane3_pre_emphasis(dp, pre_emphasis);
257 break;
258 }
259}
260
261static void exynos_dp_link_start(struct exynos_dp_device *dp)
262{
263 u8 buf[5];
264 int lane;
265 int lane_count;
266
267 lane_count = dp->link_train.lane_count;
268
269 dp->link_train.lt_state = CLOCK_RECOVERY;
270 dp->link_train.eq_loop = 0;
271
272 for (lane = 0; lane < lane_count; lane++)
273 dp->link_train.cr_loop[lane] = 0;
274
275 /* Set sink to D0 (Sink Not Ready) mode. */
276 exynos_dp_write_byte_to_dpcd(dp, DPCD_ADDR_SINK_POWER_STATE,
277 DPCD_SET_POWER_STATE_D0);
278
279 /* Set link rate and count as you want to establish*/
280 exynos_dp_set_link_bandwidth(dp, dp->link_train.link_rate);
281 exynos_dp_set_lane_count(dp, dp->link_train.lane_count);
282
283 /* Setup RX configuration */
284 buf[0] = dp->link_train.link_rate;
285 buf[1] = dp->link_train.lane_count;
286 exynos_dp_write_bytes_to_dpcd(dp, DPCD_ADDR_LINK_BW_SET,
287 2, buf);
288
289 /* Set TX pre-emphasis to minimum */
290 for (lane = 0; lane < lane_count; lane++)
291 exynos_dp_set_lane_lane_pre_emphasis(dp,
292 PRE_EMPHASIS_LEVEL_0, lane);
293
294 /* Set training pattern 1 */
295 exynos_dp_set_training_pattern(dp, TRAINING_PTN1);
296
297 /* Set RX training pattern */
298 buf[0] = DPCD_SCRAMBLING_DISABLED |
299 DPCD_TRAINING_PATTERN_1;
300 exynos_dp_write_byte_to_dpcd(dp,
301 DPCD_ADDR_TRAINING_PATTERN_SET, buf[0]);
302
303 for (lane = 0; lane < lane_count; lane++)
304 buf[lane] = DPCD_PRE_EMPHASIS_PATTERN2_LEVEL0 |
305 DPCD_VOLTAGE_SWING_PATTERN1_LEVEL0;
306 exynos_dp_write_bytes_to_dpcd(dp,
307 DPCD_ADDR_TRAINING_PATTERN_SET,
308 lane_count, buf);
309}
310
311static unsigned char exynos_dp_get_lane_status(u8 link_status[6], int lane)
312{
313 int shift = (lane & 1) * 4;
314 u8 link_value = link_status[lane>>1];
315
316 return (link_value >> shift) & 0xf;
317}
318
319static int exynos_dp_clock_recovery_ok(u8 link_status[6], int lane_count)
320{
321 int lane;
322 u8 lane_status;
323
324 for (lane = 0; lane < lane_count; lane++) {
325 lane_status = exynos_dp_get_lane_status(link_status, lane);
326 if ((lane_status & DPCD_LANE_CR_DONE) == 0)
327 return -EINVAL;
328 }
329 return 0;
330}
331
332static int exynos_dp_channel_eq_ok(u8 link_status[6], int lane_count)
333{
334 int lane;
335 u8 lane_align;
336 u8 lane_status;
337
338 lane_align = link_status[2];
339 if ((lane_align == DPCD_INTERLANE_ALIGN_DONE) == 0)
340 return -EINVAL;
341
342 for (lane = 0; lane < lane_count; lane++) {
343 lane_status = exynos_dp_get_lane_status(link_status, lane);
344 lane_status &= DPCD_CHANNEL_EQ_BITS;
345 if (lane_status != DPCD_CHANNEL_EQ_BITS)
346 return -EINVAL;
347 }
348 return 0;
349}
350
351static unsigned char exynos_dp_get_adjust_request_voltage(u8 adjust_request[2],
352 int lane)
353{
354 int shift = (lane & 1) * 4;
355 u8 link_value = adjust_request[lane>>1];
356
357 return (link_value >> shift) & 0x3;
358}
359
360static unsigned char exynos_dp_get_adjust_request_pre_emphasis(
361 u8 adjust_request[2],
362 int lane)
363{
364 int shift = (lane & 1) * 4;
365 u8 link_value = adjust_request[lane>>1];
366
367 return ((link_value >> shift) & 0xc) >> 2;
368}
369
370static void exynos_dp_set_lane_link_training(struct exynos_dp_device *dp,
371 u8 training_lane_set, int lane)
372{
373 switch (lane) {
374 case 0:
375 exynos_dp_set_lane0_link_training(dp, training_lane_set);
376 break;
377 case 1:
378 exynos_dp_set_lane1_link_training(dp, training_lane_set);
379 break;
380
381 case 2:
382 exynos_dp_set_lane2_link_training(dp, training_lane_set);
383 break;
384
385 case 3:
386 exynos_dp_set_lane3_link_training(dp, training_lane_set);
387 break;
388 }
389}
390
391static unsigned int exynos_dp_get_lane_link_training(
392 struct exynos_dp_device *dp,
393 int lane)
394{
395 u32 reg;
396
397 switch (lane) {
398 case 0:
399 reg = exynos_dp_get_lane0_link_training(dp);
400 break;
401 case 1:
402 reg = exynos_dp_get_lane1_link_training(dp);
403 break;
404 case 2:
405 reg = exynos_dp_get_lane2_link_training(dp);
406 break;
407 case 3:
408 reg = exynos_dp_get_lane3_link_training(dp);
409 break;
410 }
411
412 return reg;
413}
414
415static void exynos_dp_reduce_link_rate(struct exynos_dp_device *dp)
416{
417 if (dp->link_train.link_rate == LINK_RATE_2_70GBPS) {
418 /* set to reduced bit rate */
419 dp->link_train.link_rate = LINK_RATE_1_62GBPS;
420 dev_err(dp->dev, "set to bandwidth %.2x\n",
421 dp->link_train.link_rate);
422 dp->link_train.lt_state = START;
423 } else {
424 exynos_dp_training_pattern_dis(dp);
425 /* set enhanced mode if available */
426 exynos_dp_set_enhanced_mode(dp);
427 dp->link_train.lt_state = FAILED;
428 }
429}
430
431static void exynos_dp_get_adjust_train(struct exynos_dp_device *dp,
432 u8 adjust_request[2])
433{
434 int lane;
435 int lane_count;
436 u8 voltage_swing;
437 u8 pre_emphasis;
438 u8 training_lane;
439
440 lane_count = dp->link_train.lane_count;
441 for (lane = 0; lane < lane_count; lane++) {
442 voltage_swing = exynos_dp_get_adjust_request_voltage(
443 adjust_request, lane);
444 pre_emphasis = exynos_dp_get_adjust_request_pre_emphasis(
445 adjust_request, lane);
446 training_lane = DPCD_VOLTAGE_SWING_SET(voltage_swing) |
447 DPCD_PRE_EMPHASIS_SET(pre_emphasis);
448
449 if (voltage_swing == VOLTAGE_LEVEL_3 ||
450 pre_emphasis == PRE_EMPHASIS_LEVEL_3) {
451 training_lane |= DPCD_MAX_SWING_REACHED;
452 training_lane |= DPCD_MAX_PRE_EMPHASIS_REACHED;
453 }
454 dp->link_train.training_lane[lane] = training_lane;
455 }
456}
457
458static int exynos_dp_check_max_cr_loop(struct exynos_dp_device *dp,
459 u8 voltage_swing)
460{
461 int lane;
462 int lane_count;
463
464 lane_count = dp->link_train.lane_count;
465 for (lane = 0; lane < lane_count; lane++) {
466 if (voltage_swing == VOLTAGE_LEVEL_3 ||
467 dp->link_train.cr_loop[lane] == MAX_CR_LOOP)
468 return -EINVAL;
469 }
470 return 0;
471}
472
473static int exynos_dp_process_clock_recovery(struct exynos_dp_device *dp)
474{
475 u8 data;
476 u8 link_status[6];
477 int lane;
478 int lane_count;
479 u8 buf[5];
480
481 u8 *adjust_request;
482 u8 voltage_swing;
483 u8 pre_emphasis;
484 u8 training_lane;
485
486 udelay(100);
487
488 exynos_dp_read_bytes_from_dpcd(dp, DPCD_ADDR_LANE0_1_STATUS,
489 6, link_status);
490 lane_count = dp->link_train.lane_count;
491
492 if (exynos_dp_clock_recovery_ok(link_status, lane_count) == 0) {
493 /* set training pattern 2 for EQ */
494 exynos_dp_set_training_pattern(dp, TRAINING_PTN2);
495
496 adjust_request = link_status + (DPCD_ADDR_ADJUST_REQUEST_LANE0_1
497 - DPCD_ADDR_LANE0_1_STATUS);
498
499 exynos_dp_get_adjust_train(dp, adjust_request);
500
501 buf[0] = DPCD_SCRAMBLING_DISABLED |
502 DPCD_TRAINING_PATTERN_2;
503 exynos_dp_write_byte_to_dpcd(dp,
504 DPCD_ADDR_TRAINING_LANE0_SET,
505 buf[0]);
506
507 for (lane = 0; lane < lane_count; lane++) {
508 exynos_dp_set_lane_link_training(dp,
509 dp->link_train.training_lane[lane],
510 lane);
511 buf[lane] = dp->link_train.training_lane[lane];
512 exynos_dp_write_byte_to_dpcd(dp,
513 DPCD_ADDR_TRAINING_LANE0_SET + lane,
514 buf[lane]);
515 }
516 dp->link_train.lt_state = EQUALIZER_TRAINING;
517 } else {
518 exynos_dp_read_byte_from_dpcd(dp,
519 DPCD_ADDR_ADJUST_REQUEST_LANE0_1,
520 &data);
521 adjust_request[0] = data;
522
523 exynos_dp_read_byte_from_dpcd(dp,
524 DPCD_ADDR_ADJUST_REQUEST_LANE2_3,
525 &data);
526 adjust_request[1] = data;
527
528 for (lane = 0; lane < lane_count; lane++) {
529 training_lane = exynos_dp_get_lane_link_training(
530 dp, lane);
531 voltage_swing = exynos_dp_get_adjust_request_voltage(
532 adjust_request, lane);
533 pre_emphasis = exynos_dp_get_adjust_request_pre_emphasis(
534 adjust_request, lane);
535 if ((DPCD_VOLTAGE_SWING_GET(training_lane) == voltage_swing) &&
536 (DPCD_PRE_EMPHASIS_GET(training_lane) == pre_emphasis))
537 dp->link_train.cr_loop[lane]++;
538 dp->link_train.training_lane[lane] = training_lane;
539 }
540
541 if (exynos_dp_check_max_cr_loop(dp, voltage_swing) != 0) {
542 exynos_dp_reduce_link_rate(dp);
543 } else {
544 exynos_dp_get_adjust_train(dp, adjust_request);
545
546 for (lane = 0; lane < lane_count; lane++) {
547 exynos_dp_set_lane_link_training(dp,
548 dp->link_train.training_lane[lane],
549 lane);
550 buf[lane] = dp->link_train.training_lane[lane];
551 exynos_dp_write_byte_to_dpcd(dp,
552 DPCD_ADDR_TRAINING_LANE0_SET + lane,
553 buf[lane]);
554 }
555 }
556 }
557
558 return 0;
559}
560
561static int exynos_dp_process_equalizer_training(struct exynos_dp_device *dp)
562{
563 u8 link_status[6];
564 int lane;
565 int lane_count;
566 u8 buf[5];
567 u32 reg;
568
569 u8 *adjust_request;
570
571 udelay(400);
572
573 exynos_dp_read_bytes_from_dpcd(dp, DPCD_ADDR_LANE0_1_STATUS,
574 6, link_status);
575 lane_count = dp->link_train.lane_count;
576
577 if (exynos_dp_clock_recovery_ok(link_status, lane_count) == 0) {
578 adjust_request = link_status + (DPCD_ADDR_ADJUST_REQUEST_LANE0_1
579 - DPCD_ADDR_LANE0_1_STATUS);
580
581 if (exynos_dp_channel_eq_ok(link_status, lane_count) == 0) {
582 /* traing pattern Set to Normal */
583 exynos_dp_training_pattern_dis(dp);
584
585 dev_info(dp->dev, "Link Training success!\n");
586
587 exynos_dp_get_link_bandwidth(dp, ®);
588 dp->link_train.link_rate = reg;
589 dev_dbg(dp->dev, "final bandwidth = %.2x\n",
590 dp->link_train.link_rate);
591
592 exynos_dp_get_lane_count(dp, ®);
593 dp->link_train.lane_count = reg;
594 dev_dbg(dp->dev, "final lane count = %.2x\n",
595 dp->link_train.lane_count);
596 /* set enhanced mode if available */
597 exynos_dp_set_enhanced_mode(dp);
598
599 dp->link_train.lt_state = FINISHED;
600 } else {
601 /* not all locked */
602 dp->link_train.eq_loop++;
603
604 if (dp->link_train.eq_loop > MAX_EQ_LOOP) {
605 exynos_dp_reduce_link_rate(dp);
606 } else {
607 exynos_dp_get_adjust_train(dp, adjust_request);
608
609 for (lane = 0; lane < lane_count; lane++) {
610 exynos_dp_set_lane_link_training(dp,
611 dp->link_train.training_lane[lane],
612 lane);
613 buf[lane] = dp->link_train.training_lane[lane];
614 exynos_dp_write_byte_to_dpcd(dp,
615 DPCD_ADDR_TRAINING_LANE0_SET + lane,
616 buf[lane]);
617 }
618 }
619 }
620 } else {
621 exynos_dp_reduce_link_rate(dp);
622 }
623
624 return 0;
625}
626
627static void exynos_dp_get_max_rx_bandwidth(struct exynos_dp_device *dp,
628 u8 *bandwidth)
629{
630 u8 data;
631
632 /*
633 * For DP rev.1.1, Maximum link rate of Main Link lanes
634 * 0x06 = 1.62 Gbps, 0x0a = 2.7 Gbps
635 */
636 exynos_dp_read_byte_from_dpcd(dp, DPCD_ADDR_MAX_LINK_RATE, &data);
637 *bandwidth = data;
638}
639
640static void exynos_dp_get_max_rx_lane_count(struct exynos_dp_device *dp,
641 u8 *lane_count)
642{
643 u8 data;
644
645 /*
646 * For DP rev.1.1, Maximum number of Main Link lanes
647 * 0x01 = 1 lane, 0x02 = 2 lanes, 0x04 = 4 lanes
648 */
649 exynos_dp_read_byte_from_dpcd(dp, DPCD_ADDR_MAX_LANE_COUNT, &data);
650 *lane_count = DPCD_MAX_LANE_COUNT(data);
651}
652
653static void exynos_dp_init_training(struct exynos_dp_device *dp,
654 enum link_lane_count_type max_lane,
655 enum link_rate_type max_rate)
656{
657 /*
658 * MACRO_RST must be applied after the PLL_LOCK to avoid
659 * the DP inter pair skew issue for at least 10 us
660 */
661 exynos_dp_reset_macro(dp);
662
663 /* Initialize by reading RX's DPCD */
664 exynos_dp_get_max_rx_bandwidth(dp, &dp->link_train.link_rate);
665 exynos_dp_get_max_rx_lane_count(dp, &dp->link_train.lane_count);
666
667 if ((dp->link_train.link_rate != LINK_RATE_1_62GBPS) &&
668 (dp->link_train.link_rate != LINK_RATE_2_70GBPS)) {
669 dev_err(dp->dev, "Rx Max Link Rate is abnormal :%x !\n",
670 dp->link_train.link_rate);
671 dp->link_train.link_rate = LINK_RATE_1_62GBPS;
672 }
673
674 if (dp->link_train.lane_count == 0) {
675 dev_err(dp->dev, "Rx Max Lane count is abnormal :%x !\n",
676 dp->link_train.lane_count);
677 dp->link_train.lane_count = (u8)LANE_COUNT1;
678 }
679
680 /* Setup TX lane count & rate */
681 if (dp->link_train.lane_count > max_lane)
682 dp->link_train.lane_count = max_lane;
683 if (dp->link_train.link_rate > max_rate)
684 dp->link_train.link_rate = max_rate;
685
686 /* All DP analog module power up */
687 exynos_dp_set_analog_power_down(dp, POWER_ALL, 0);
688}
689
690static int exynos_dp_sw_link_training(struct exynos_dp_device *dp)
691{
692 int retval = 0;
693 int training_finished;
694
695 /* Turn off unnecessary lane */
696 if (dp->link_train.lane_count == 1)
697 exynos_dp_set_analog_power_down(dp, CH1_BLOCK, 1);
698
699 training_finished = 0;
700
701 dp->link_train.lt_state = START;
702
703 /* Process here */
704 while (!training_finished) {
705 switch (dp->link_train.lt_state) {
706 case START:
707 exynos_dp_link_start(dp);
708 break;
709 case CLOCK_RECOVERY:
710 exynos_dp_process_clock_recovery(dp);
711 break;
712 case EQUALIZER_TRAINING:
713 exynos_dp_process_equalizer_training(dp);
714 break;
715 case FINISHED:
716 training_finished = 1;
717 break;
718 case FAILED:
719 return -EREMOTEIO;
720 }
721 }
722
723 return retval;
724}
725
726static int exynos_dp_set_link_train(struct exynos_dp_device *dp,
727 u32 count,
728 u32 bwtype)
729{
730 int i;
731 int retval;
732
733 for (i = 0; i < DP_TIMEOUT_LOOP_COUNT; i++) {
734 exynos_dp_init_training(dp, count, bwtype);
735 retval = exynos_dp_sw_link_training(dp);
736 if (retval == 0)
737 break;
738
739 udelay(100);
740 }
741
742 return retval;
743}
744
745static int exynos_dp_config_video(struct exynos_dp_device *dp,
746 struct video_info *video_info)
747{
748 int retval = 0;
749 int timeout_loop = 0;
750 int done_count = 0;
751
752 exynos_dp_config_video_slave_mode(dp, video_info);
753
754 exynos_dp_set_video_color_format(dp, video_info->color_depth,
755 video_info->color_space,
756 video_info->dynamic_range,
757 video_info->ycbcr_coeff);
758
759 if (exynos_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) {
760 dev_err(dp->dev, "PLL is not locked yet.\n");
761 return -EINVAL;
762 }
763
764 for (;;) {
765 timeout_loop++;
766 if (exynos_dp_is_slave_video_stream_clock_on(dp) == 0)
767 break;
768 if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {
769 dev_err(dp->dev, "Timeout of video streamclk ok\n");
770 return -ETIMEDOUT;
771 }
772
773 mdelay(100);
774 }
775
776 /* Set to use the register calculated M/N video */
777 exynos_dp_set_video_cr_mn(dp, CALCULATED_M, 0, 0);
778
779 /* For video bist, Video timing must be generated by register */
780 exynos_dp_set_video_timing_mode(dp, VIDEO_TIMING_FROM_CAPTURE);
781
782 /* Disable video mute */
783 exynos_dp_enable_video_mute(dp, 0);
784
785 /* Configure video slave mode */
786 exynos_dp_enable_video_master(dp, 0);
787
788 /* Enable video */
789 exynos_dp_start_video(dp);
790
791 timeout_loop = 0;
792
793 for (;;) {
794 timeout_loop++;
795 if (exynos_dp_is_video_stream_on(dp) == 0) {
796 done_count++;
797 if (done_count > 10)
798 break;
799 } else if (done_count) {
800 done_count = 0;
801 }
802 if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {
803 dev_err(dp->dev, "Timeout of video streamclk ok\n");
804 return -ETIMEDOUT;
805 }
806
807 mdelay(100);
808 }
809
810 if (retval != 0)
811 dev_err(dp->dev, "Video stream is not detected!\n");
812
813 return retval;
814}
815
816static void exynos_dp_enable_scramble(struct exynos_dp_device *dp, bool enable)
817{
818 u8 data;
819
820 if (enable) {
821 exynos_dp_enable_scrambling(dp);
822
823 exynos_dp_read_byte_from_dpcd(dp,
824 DPCD_ADDR_TRAINING_PATTERN_SET,
825 &data);
826 exynos_dp_write_byte_to_dpcd(dp,
827 DPCD_ADDR_TRAINING_PATTERN_SET,
828 (u8)(data & ~DPCD_SCRAMBLING_DISABLED));
829 } else {
830 exynos_dp_disable_scrambling(dp);
831
832 exynos_dp_read_byte_from_dpcd(dp,
833 DPCD_ADDR_TRAINING_PATTERN_SET,
834 &data);
835 exynos_dp_write_byte_to_dpcd(dp,
836 DPCD_ADDR_TRAINING_PATTERN_SET,
837 (u8)(data | DPCD_SCRAMBLING_DISABLED));
838 }
839}
840
841static irqreturn_t exynos_dp_irq_handler(int irq, void *arg)
842{
843 struct exynos_dp_device *dp = arg;
844
845 dev_err(dp->dev, "exynos_dp_irq_handler\n");
846 return IRQ_HANDLED;
847}
848
849static int __devinit exynos_dp_probe(struct platform_device *pdev)
850{
851 struct resource *res;
852 struct exynos_dp_device *dp;
853 struct exynos_dp_platdata *pdata;
854
855 int ret = 0;
856
857 pdata = pdev->dev.platform_data;
858 if (!pdata) {
859 dev_err(&pdev->dev, "no platform data\n");
860 return -EINVAL;
861 }
862
863 dp = kzalloc(sizeof(struct exynos_dp_device), GFP_KERNEL);
864 if (!dp) {
865 dev_err(&pdev->dev, "no memory for device data\n");
866 return -ENOMEM;
867 }
868
869 dp->dev = &pdev->dev;
870
871 dp->clock = clk_get(&pdev->dev, "dp");
872 if (IS_ERR(dp->clock)) {
873 dev_err(&pdev->dev, "failed to get clock\n");
874 ret = PTR_ERR(dp->clock);
875 goto err_dp;
876 }
877
878 clk_enable(dp->clock);
879
880 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
881 if (!res) {
882 dev_err(&pdev->dev, "failed to get registers\n");
883 ret = -EINVAL;
884 goto err_clock;
885 }
886
887 res = request_mem_region(res->start, resource_size(res),
888 dev_name(&pdev->dev));
889 if (!res) {
890 dev_err(&pdev->dev, "failed to request registers region\n");
891 ret = -EINVAL;
892 goto err_clock;
893 }
894
895 dp->res = res;
896
897 dp->reg_base = ioremap(res->start, resource_size(res));
898 if (!dp->reg_base) {
899 dev_err(&pdev->dev, "failed to ioremap\n");
900 ret = -ENOMEM;
901 goto err_req_region;
902 }
903
904 dp->irq = platform_get_irq(pdev, 0);
905 if (!dp->irq) {
906 dev_err(&pdev->dev, "failed to get irq\n");
907 ret = -ENODEV;
908 goto err_ioremap;
909 }
910
911 ret = request_irq(dp->irq, exynos_dp_irq_handler, 0,
912 "exynos-dp", dp);
913 if (ret) {
914 dev_err(&pdev->dev, "failed to request irq\n");
915 goto err_ioremap;
916 }
917
918 dp->video_info = pdata->video_info;
919 if (pdata->phy_init)
920 pdata->phy_init();
921
922 exynos_dp_init_dp(dp);
923
924 ret = exynos_dp_detect_hpd(dp);
925 if (ret) {
926 dev_err(&pdev->dev, "unable to detect hpd\n");
927 goto err_irq;
928 }
929
930 exynos_dp_handle_edid(dp);
931
932 ret = exynos_dp_set_link_train(dp, dp->video_info->lane_count,
933 dp->video_info->link_rate);
934 if (ret) {
935 dev_err(&pdev->dev, "unable to do link train\n");
936 goto err_irq;
937 }
938
939 exynos_dp_enable_scramble(dp, 1);
940 exynos_dp_enable_rx_to_enhanced_mode(dp, 1);
941 exynos_dp_enable_enhanced_mode(dp, 1);
942
943 exynos_dp_set_lane_count(dp, dp->video_info->lane_count);
944 exynos_dp_set_link_bandwidth(dp, dp->video_info->link_rate);
945
946 exynos_dp_init_video(dp);
947 ret = exynos_dp_config_video(dp, dp->video_info);
948 if (ret) {
949 dev_err(&pdev->dev, "unable to config video\n");
950 goto err_irq;
951 }
952
953 platform_set_drvdata(pdev, dp);
954
955 return 0;
956
957err_irq:
958 free_irq(dp->irq, dp);
959err_ioremap:
960 iounmap(dp->reg_base);
961err_req_region:
962 release_mem_region(res->start, resource_size(res));
963err_clock:
964 clk_put(dp->clock);
965err_dp:
966 kfree(dp);
967
968 return ret;
969}
970
971static int __devexit exynos_dp_remove(struct platform_device *pdev)
972{
973 struct exynos_dp_platdata *pdata = pdev->dev.platform_data;
974 struct exynos_dp_device *dp = platform_get_drvdata(pdev);
975
976 if (pdata && pdata->phy_exit)
977 pdata->phy_exit();
978
979 free_irq(dp->irq, dp);
980 iounmap(dp->reg_base);
981
982 clk_disable(dp->clock);
983 clk_put(dp->clock);
984
985 release_mem_region(dp->res->start, resource_size(dp->res));
986
987 kfree(dp);
988
989 return 0;
990}
991
992#ifdef CONFIG_PM_SLEEP
993static int exynos_dp_suspend(struct device *dev)
994{
995 struct platform_device *pdev = to_platform_device(dev);
996 struct exynos_dp_platdata *pdata = pdev->dev.platform_data;
997 struct exynos_dp_device *dp = platform_get_drvdata(pdev);
998
999 if (pdata && pdata->phy_exit)
1000 pdata->phy_exit();
1001
1002 clk_disable(dp->clock);
1003
1004 return 0;
1005}
1006
1007static int exynos_dp_resume(struct device *dev)
1008{
1009 struct platform_device *pdev = to_platform_device(dev);
1010 struct exynos_dp_platdata *pdata = pdev->dev.platform_data;
1011 struct exynos_dp_device *dp = platform_get_drvdata(pdev);
1012
1013 if (pdata && pdata->phy_init)
1014 pdata->phy_init();
1015
1016 clk_enable(dp->clock);
1017
1018 exynos_dp_init_dp(dp);
1019
1020 exynos_dp_detect_hpd(dp);
1021 exynos_dp_handle_edid(dp);
1022
1023 exynos_dp_set_link_train(dp, dp->video_info->lane_count,
1024 dp->video_info->link_rate);
1025
1026 exynos_dp_enable_scramble(dp, 1);
1027 exynos_dp_enable_rx_to_enhanced_mode(dp, 1);
1028 exynos_dp_enable_enhanced_mode(dp, 1);
1029
1030 exynos_dp_set_lane_count(dp, dp->video_info->lane_count);
1031 exynos_dp_set_link_bandwidth(dp, dp->video_info->link_rate);
1032
1033 exynos_dp_init_video(dp);
1034 exynos_dp_config_video(dp, dp->video_info);
1035
1036 return 0;
1037}
1038#endif
1039
1040static const struct dev_pm_ops exynos_dp_pm_ops = {
1041 SET_SYSTEM_SLEEP_PM_OPS(exynos_dp_suspend, exynos_dp_resume)
1042};
1043
1044static struct platform_driver exynos_dp_driver = {
1045 .probe = exynos_dp_probe,
1046 .remove = __devexit_p(exynos_dp_remove),
1047 .driver = {
1048 .name = "exynos-dp",
1049 .owner = THIS_MODULE,
1050 .pm = &exynos_dp_pm_ops,
1051 },
1052};
1053
1054module_platform_driver(exynos_dp_driver);
1055
1056MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
1057MODULE_DESCRIPTION("Samsung SoC DP Driver");
1058MODULE_LICENSE("GPL");