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1/*
2 * Copyright 2018 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: AMD
23 *
24 */
25
26#include <linux/uaccess.h>
27
28#include <drm/drm_debugfs.h>
29
30#include "dc.h"
31#include "amdgpu.h"
32#include "amdgpu_dm.h"
33#include "amdgpu_dm_debugfs.h"
34#include "dm_helpers.h"
35
36/* function description
37 * get/ set DP configuration: lane_count, link_rate, spread_spectrum
38 *
39 * valid lane count value: 1, 2, 4
40 * valid link rate value:
41 * 06h = 1.62Gbps per lane
42 * 0Ah = 2.7Gbps per lane
43 * 0Ch = 3.24Gbps per lane
44 * 14h = 5.4Gbps per lane
45 * 1Eh = 8.1Gbps per lane
46 *
47 * debugfs is located at /sys/kernel/debug/dri/0/DP-x/link_settings
48 *
49 * --- to get dp configuration
50 *
51 * cat link_settings
52 *
53 * It will list current, verified, reported, preferred dp configuration.
54 * current -- for current video mode
55 * verified --- maximum configuration which pass link training
56 * reported --- DP rx report caps (DPCD register offset 0, 1 2)
57 * preferred --- user force settings
58 *
59 * --- set (or force) dp configuration
60 *
61 * echo <lane_count> <link_rate> > link_settings
62 *
63 * for example, to force to 2 lane, 2.7GHz,
64 * echo 4 0xa > link_settings
65 *
66 * spread_spectrum could not be changed dynamically.
67 *
68 * in case invalid lane count, link rate are force, no hw programming will be
69 * done. please check link settings after force operation to see if HW get
70 * programming.
71 *
72 * cat link_settings
73 *
74 * check current and preferred settings.
75 *
76 */
77static ssize_t dp_link_settings_read(struct file *f, char __user *buf,
78 size_t size, loff_t *pos)
79{
80 struct amdgpu_dm_connector *connector = file_inode(f)->i_private;
81 struct dc_link *link = connector->dc_link;
82 char *rd_buf = NULL;
83 char *rd_buf_ptr = NULL;
84 const uint32_t rd_buf_size = 100;
85 uint32_t result = 0;
86 uint8_t str_len = 0;
87 int r;
88
89 if (*pos & 3 || size & 3)
90 return -EINVAL;
91
92 rd_buf = kcalloc(rd_buf_size, sizeof(char), GFP_KERNEL);
93 if (!rd_buf)
94 return 0;
95
96 rd_buf_ptr = rd_buf;
97
98 str_len = strlen("Current: %d %d %d ");
99 snprintf(rd_buf_ptr, str_len, "Current: %d %d %d ",
100 link->cur_link_settings.lane_count,
101 link->cur_link_settings.link_rate,
102 link->cur_link_settings.link_spread);
103 rd_buf_ptr += str_len;
104
105 str_len = strlen("Verified: %d %d %d ");
106 snprintf(rd_buf_ptr, str_len, "Verified: %d %d %d ",
107 link->verified_link_cap.lane_count,
108 link->verified_link_cap.link_rate,
109 link->verified_link_cap.link_spread);
110 rd_buf_ptr += str_len;
111
112 str_len = strlen("Reported: %d %d %d ");
113 snprintf(rd_buf_ptr, str_len, "Reported: %d %d %d ",
114 link->reported_link_cap.lane_count,
115 link->reported_link_cap.link_rate,
116 link->reported_link_cap.link_spread);
117 rd_buf_ptr += str_len;
118
119 str_len = strlen("Preferred: %d %d %d ");
120 snprintf(rd_buf_ptr, str_len, "Preferred: %d %d %d\n",
121 link->preferred_link_setting.lane_count,
122 link->preferred_link_setting.link_rate,
123 link->preferred_link_setting.link_spread);
124
125 while (size) {
126 if (*pos >= rd_buf_size)
127 break;
128
129 r = put_user(*(rd_buf + result), buf);
130 if (r)
131 return r; /* r = -EFAULT */
132
133 buf += 1;
134 size -= 1;
135 *pos += 1;
136 result += 1;
137 }
138
139 kfree(rd_buf);
140 return result;
141}
142
143static ssize_t dp_link_settings_write(struct file *f, const char __user *buf,
144 size_t size, loff_t *pos)
145{
146 struct amdgpu_dm_connector *connector = file_inode(f)->i_private;
147 struct dc_link *link = connector->dc_link;
148 struct dc *dc = (struct dc *)link->dc;
149 struct dc_link_settings prefer_link_settings;
150 char *wr_buf = NULL;
151 char *wr_buf_ptr = NULL;
152 const uint32_t wr_buf_size = 40;
153 int r;
154 int bytes_from_user;
155 char *sub_str;
156 /* 0: lane_count; 1: link_rate */
157 uint8_t param_index = 0;
158 long param[2];
159 const char delimiter[3] = {' ', '\n', '\0'};
160 bool valid_input = false;
161
162 if (size == 0)
163 return -EINVAL;
164
165 wr_buf = kcalloc(wr_buf_size, sizeof(char), GFP_KERNEL);
166 if (!wr_buf)
167 return -EINVAL;
168 wr_buf_ptr = wr_buf;
169
170 r = copy_from_user(wr_buf_ptr, buf, wr_buf_size);
171
172 /* r is bytes not be copied */
173 if (r >= wr_buf_size) {
174 kfree(wr_buf);
175 DRM_DEBUG_DRIVER("user data not read\n");
176 return -EINVAL;
177 }
178
179 bytes_from_user = wr_buf_size - r;
180
181 while (isspace(*wr_buf_ptr))
182 wr_buf_ptr++;
183
184 while ((*wr_buf_ptr != '\0') && (param_index < 2)) {
185
186 sub_str = strsep(&wr_buf_ptr, delimiter);
187
188 r = kstrtol(sub_str, 16, ¶m[param_index]);
189
190 if (r)
191 DRM_DEBUG_DRIVER("string to int convert error code: %d\n", r);
192
193 param_index++;
194 while (isspace(*wr_buf_ptr))
195 wr_buf_ptr++;
196 }
197
198 switch (param[0]) {
199 case LANE_COUNT_ONE:
200 case LANE_COUNT_TWO:
201 case LANE_COUNT_FOUR:
202 valid_input = true;
203 break;
204 default:
205 break;
206 }
207
208 switch (param[1]) {
209 case LINK_RATE_LOW:
210 case LINK_RATE_HIGH:
211 case LINK_RATE_RBR2:
212 case LINK_RATE_HIGH2:
213 case LINK_RATE_HIGH3:
214 valid_input = true;
215 break;
216 default:
217 break;
218 }
219
220 if (!valid_input) {
221 kfree(wr_buf);
222 DRM_DEBUG_DRIVER("Invalid Input value No HW will be programmed\n");
223 return bytes_from_user;
224 }
225
226 /* save user force lane_count, link_rate to preferred settings
227 * spread spectrum will not be changed
228 */
229 prefer_link_settings.link_spread = link->cur_link_settings.link_spread;
230 prefer_link_settings.lane_count = param[0];
231 prefer_link_settings.link_rate = param[1];
232
233 dc_link_set_preferred_link_settings(dc, &prefer_link_settings, link);
234
235 kfree(wr_buf);
236 return bytes_from_user;
237}
238
239/* function: get current DP PHY settings: voltage swing, pre-emphasis,
240 * post-cursor2 (defined by VESA DP specification)
241 *
242 * valid values
243 * voltage swing: 0,1,2,3
244 * pre-emphasis : 0,1,2,3
245 * post cursor2 : 0,1,2,3
246 *
247 *
248 * how to use this debugfs
249 *
250 * debugfs is located at /sys/kernel/debug/dri/0/DP-x
251 *
252 * there will be directories, like DP-1, DP-2,DP-3, etc. for DP display
253 *
254 * To figure out which DP-x is the display for DP to be check,
255 * cd DP-x
256 * ls -ll
257 * There should be debugfs file, like link_settings, phy_settings.
258 * cat link_settings
259 * from lane_count, link_rate to figure which DP-x is for display to be worked
260 * on
261 *
262 * To get current DP PHY settings,
263 * cat phy_settings
264 *
265 * To change DP PHY settings,
266 * echo <voltage_swing> <pre-emphasis> <post_cursor2> > phy_settings
267 * for examle, to change voltage swing to 2, pre-emphasis to 3, post_cursor2 to
268 * 0,
269 * echo 2 3 0 > phy_settings
270 *
271 * To check if change be applied, get current phy settings by
272 * cat phy_settings
273 *
274 * In case invalid values are set by user, like
275 * echo 1 4 0 > phy_settings
276 *
277 * HW will NOT be programmed by these settings.
278 * cat phy_settings will show the previous valid settings.
279 */
280static ssize_t dp_phy_settings_read(struct file *f, char __user *buf,
281 size_t size, loff_t *pos)
282{
283 struct amdgpu_dm_connector *connector = file_inode(f)->i_private;
284 struct dc_link *link = connector->dc_link;
285 char *rd_buf = NULL;
286 const uint32_t rd_buf_size = 20;
287 uint32_t result = 0;
288 int r;
289
290 if (*pos & 3 || size & 3)
291 return -EINVAL;
292
293 rd_buf = kcalloc(rd_buf_size, sizeof(char), GFP_KERNEL);
294 if (!rd_buf)
295 return -EINVAL;
296
297 snprintf(rd_buf, rd_buf_size, " %d %d %d ",
298 link->cur_lane_setting.VOLTAGE_SWING,
299 link->cur_lane_setting.PRE_EMPHASIS,
300 link->cur_lane_setting.POST_CURSOR2);
301
302 while (size) {
303 if (*pos >= rd_buf_size)
304 break;
305
306 r = put_user((*(rd_buf + result)), buf);
307 if (r)
308 return r; /* r = -EFAULT */
309
310 buf += 1;
311 size -= 1;
312 *pos += 1;
313 result += 1;
314 }
315
316 kfree(rd_buf);
317 return result;
318}
319
320static ssize_t dp_phy_settings_write(struct file *f, const char __user *buf,
321 size_t size, loff_t *pos)
322{
323 struct amdgpu_dm_connector *connector = file_inode(f)->i_private;
324 struct dc_link *link = connector->dc_link;
325 struct dc *dc = (struct dc *)link->dc;
326 char *wr_buf = NULL;
327 char *wr_buf_ptr = NULL;
328 uint32_t wr_buf_size = 40;
329 int r;
330 int bytes_from_user;
331 char *sub_str;
332 uint8_t param_index = 0;
333 long param[3];
334 const char delimiter[3] = {' ', '\n', '\0'};
335 bool use_prefer_link_setting;
336 struct link_training_settings link_lane_settings;
337
338 if (size == 0)
339 return 0;
340
341 wr_buf = kcalloc(wr_buf_size, sizeof(char), GFP_KERNEL);
342 if (!wr_buf)
343 return 0;
344 wr_buf_ptr = wr_buf;
345
346 r = copy_from_user(wr_buf_ptr, buf, wr_buf_size);
347
348 /* r is bytes not be copied */
349 if (r >= wr_buf_size) {
350 kfree(wr_buf);
351 DRM_DEBUG_DRIVER("user data not be read\n");
352 return 0;
353 }
354
355 bytes_from_user = wr_buf_size - r;
356
357 while (isspace(*wr_buf_ptr))
358 wr_buf_ptr++;
359
360 while ((*wr_buf_ptr != '\0') && (param_index < 3)) {
361
362 sub_str = strsep(&wr_buf_ptr, delimiter);
363
364 r = kstrtol(sub_str, 16, ¶m[param_index]);
365
366 if (r)
367 DRM_DEBUG_DRIVER("string to int convert error code: %d\n", r);
368
369 param_index++;
370 while (isspace(*wr_buf_ptr))
371 wr_buf_ptr++;
372 }
373
374 if ((param[0] > VOLTAGE_SWING_MAX_LEVEL) ||
375 (param[1] > PRE_EMPHASIS_MAX_LEVEL) ||
376 (param[2] > POST_CURSOR2_MAX_LEVEL)) {
377 kfree(wr_buf);
378 DRM_DEBUG_DRIVER("Invalid Input No HW will be programmed\n");
379 return bytes_from_user;
380 }
381
382 /* get link settings: lane count, link rate */
383 use_prefer_link_setting =
384 ((link->preferred_link_setting.link_rate != LINK_RATE_UNKNOWN) &&
385 (link->test_pattern_enabled));
386
387 memset(&link_lane_settings, 0, sizeof(link_lane_settings));
388
389 if (use_prefer_link_setting) {
390 link_lane_settings.link_settings.lane_count =
391 link->preferred_link_setting.lane_count;
392 link_lane_settings.link_settings.link_rate =
393 link->preferred_link_setting.link_rate;
394 link_lane_settings.link_settings.link_spread =
395 link->preferred_link_setting.link_spread;
396 } else {
397 link_lane_settings.link_settings.lane_count =
398 link->cur_link_settings.lane_count;
399 link_lane_settings.link_settings.link_rate =
400 link->cur_link_settings.link_rate;
401 link_lane_settings.link_settings.link_spread =
402 link->cur_link_settings.link_spread;
403 }
404
405 /* apply phy settings from user */
406 for (r = 0; r < link_lane_settings.link_settings.lane_count; r++) {
407 link_lane_settings.lane_settings[r].VOLTAGE_SWING =
408 (enum dc_voltage_swing) (param[0]);
409 link_lane_settings.lane_settings[r].PRE_EMPHASIS =
410 (enum dc_pre_emphasis) (param[1]);
411 link_lane_settings.lane_settings[r].POST_CURSOR2 =
412 (enum dc_post_cursor2) (param[2]);
413 }
414
415 /* program ASIC registers and DPCD registers */
416 dc_link_set_drive_settings(dc, &link_lane_settings, link);
417
418 kfree(wr_buf);
419 return bytes_from_user;
420}
421
422/* function description
423 *
424 * set PHY layer or Link layer test pattern
425 * PHY test pattern is used for PHY SI check.
426 * Link layer test will not affect PHY SI.
427 *
428 * Reset Test Pattern:
429 * 0 = DP_TEST_PATTERN_VIDEO_MODE
430 *
431 * PHY test pattern supported:
432 * 1 = DP_TEST_PATTERN_D102
433 * 2 = DP_TEST_PATTERN_SYMBOL_ERROR
434 * 3 = DP_TEST_PATTERN_PRBS7
435 * 4 = DP_TEST_PATTERN_80BIT_CUSTOM
436 * 5 = DP_TEST_PATTERN_CP2520_1
437 * 6 = DP_TEST_PATTERN_CP2520_2 = DP_TEST_PATTERN_HBR2_COMPLIANCE_EYE
438 * 7 = DP_TEST_PATTERN_CP2520_3
439 *
440 * DP PHY Link Training Patterns
441 * 8 = DP_TEST_PATTERN_TRAINING_PATTERN1
442 * 9 = DP_TEST_PATTERN_TRAINING_PATTERN2
443 * a = DP_TEST_PATTERN_TRAINING_PATTERN3
444 * b = DP_TEST_PATTERN_TRAINING_PATTERN4
445 *
446 * DP Link Layer Test pattern
447 * c = DP_TEST_PATTERN_COLOR_SQUARES
448 * d = DP_TEST_PATTERN_COLOR_SQUARES_CEA
449 * e = DP_TEST_PATTERN_VERTICAL_BARS
450 * f = DP_TEST_PATTERN_HORIZONTAL_BARS
451 * 10= DP_TEST_PATTERN_COLOR_RAMP
452 *
453 * debugfs phy_test_pattern is located at /syskernel/debug/dri/0/DP-x
454 *
455 * --- set test pattern
456 * echo <test pattern #> > test_pattern
457 *
458 * If test pattern # is not supported, NO HW programming will be done.
459 * for DP_TEST_PATTERN_80BIT_CUSTOM, it needs extra 10 bytes of data
460 * for the user pattern. input 10 bytes data are separated by space
461 *
462 * echo 0x4 0x11 0x22 0x33 0x44 0x55 0x66 0x77 0x88 0x99 0xaa > test_pattern
463 *
464 * --- reset test pattern
465 * echo 0 > test_pattern
466 *
467 * --- HPD detection is disabled when set PHY test pattern
468 *
469 * when PHY test pattern (pattern # within [1,7]) is set, HPD pin of HW ASIC
470 * is disable. User could unplug DP display from DP connected and plug scope to
471 * check test pattern PHY SI.
472 * If there is need unplug scope and plug DP display back, do steps below:
473 * echo 0 > phy_test_pattern
474 * unplug scope
475 * plug DP display.
476 *
477 * "echo 0 > phy_test_pattern" will re-enable HPD pin again so that video sw
478 * driver could detect "unplug scope" and "plug DP display"
479 */
480static ssize_t dp_phy_test_pattern_debugfs_write(struct file *f, const char __user *buf,
481 size_t size, loff_t *pos)
482{
483 struct amdgpu_dm_connector *connector = file_inode(f)->i_private;
484 struct dc_link *link = connector->dc_link;
485 char *wr_buf = NULL;
486 char *wr_buf_ptr = NULL;
487 uint32_t wr_buf_size = 100;
488 uint32_t wr_buf_count = 0;
489 int r;
490 int bytes_from_user;
491 char *sub_str = NULL;
492 uint8_t param_index = 0;
493 uint8_t param_nums = 0;
494 long param[11] = {0x0};
495 const char delimiter[3] = {' ', '\n', '\0'};
496 enum dp_test_pattern test_pattern = DP_TEST_PATTERN_UNSUPPORTED;
497 bool disable_hpd = false;
498 bool valid_test_pattern = false;
499 /* init with defalut 80bit custom pattern */
500 uint8_t custom_pattern[10] = {
501 0x1f, 0x7c, 0xf0, 0xc1, 0x07,
502 0x1f, 0x7c, 0xf0, 0xc1, 0x07
503 };
504 struct dc_link_settings prefer_link_settings = {LANE_COUNT_UNKNOWN,
505 LINK_RATE_UNKNOWN, LINK_SPREAD_DISABLED};
506 struct dc_link_settings cur_link_settings = {LANE_COUNT_UNKNOWN,
507 LINK_RATE_UNKNOWN, LINK_SPREAD_DISABLED};
508 struct link_training_settings link_training_settings;
509 int i;
510
511 if (size == 0)
512 return 0;
513
514 wr_buf = kcalloc(wr_buf_size, sizeof(char), GFP_KERNEL);
515 if (!wr_buf)
516 return 0;
517 wr_buf_ptr = wr_buf;
518
519 r = copy_from_user(wr_buf_ptr, buf, wr_buf_size);
520
521 /* r is bytes not be copied */
522 if (r >= wr_buf_size) {
523 kfree(wr_buf);
524 DRM_DEBUG_DRIVER("user data not be read\n");
525 return 0;
526 }
527
528 bytes_from_user = wr_buf_size - r;
529
530 /* check number of parameters. isspace could not differ space and \n */
531 while ((*wr_buf_ptr != 0xa) && (wr_buf_count < wr_buf_size)) {
532 /* skip space*/
533 while (isspace(*wr_buf_ptr) && (wr_buf_count < wr_buf_size)) {
534 wr_buf_ptr++;
535 wr_buf_count++;
536 }
537
538 if (wr_buf_count == wr_buf_size)
539 break;
540
541 /* skip non-space*/
542 while ((!isspace(*wr_buf_ptr)) && (wr_buf_count < wr_buf_size)) {
543 wr_buf_ptr++;
544 wr_buf_count++;
545 }
546
547 param_nums++;
548
549 if (wr_buf_count == wr_buf_size)
550 break;
551 }
552
553 /* max 11 parameters */
554 if (param_nums > 11)
555 param_nums = 11;
556
557 wr_buf_ptr = wr_buf; /* reset buf pinter */
558 wr_buf_count = 0; /* number of char already checked */
559
560 while (isspace(*wr_buf_ptr) && (wr_buf_count < wr_buf_size)) {
561 wr_buf_ptr++;
562 wr_buf_count++;
563 }
564
565 while (param_index < param_nums) {
566 /* after strsep, wr_buf_ptr will be moved to after space */
567 sub_str = strsep(&wr_buf_ptr, delimiter);
568
569 r = kstrtol(sub_str, 16, ¶m[param_index]);
570
571 if (r)
572 DRM_DEBUG_DRIVER("string to int convert error code: %d\n", r);
573
574 param_index++;
575 }
576
577 test_pattern = param[0];
578
579 switch (test_pattern) {
580 case DP_TEST_PATTERN_VIDEO_MODE:
581 case DP_TEST_PATTERN_COLOR_SQUARES:
582 case DP_TEST_PATTERN_COLOR_SQUARES_CEA:
583 case DP_TEST_PATTERN_VERTICAL_BARS:
584 case DP_TEST_PATTERN_HORIZONTAL_BARS:
585 case DP_TEST_PATTERN_COLOR_RAMP:
586 valid_test_pattern = true;
587 break;
588
589 case DP_TEST_PATTERN_D102:
590 case DP_TEST_PATTERN_SYMBOL_ERROR:
591 case DP_TEST_PATTERN_PRBS7:
592 case DP_TEST_PATTERN_80BIT_CUSTOM:
593 case DP_TEST_PATTERN_HBR2_COMPLIANCE_EYE:
594 case DP_TEST_PATTERN_TRAINING_PATTERN4:
595 disable_hpd = true;
596 valid_test_pattern = true;
597 break;
598
599 default:
600 valid_test_pattern = false;
601 test_pattern = DP_TEST_PATTERN_UNSUPPORTED;
602 break;
603 }
604
605 if (!valid_test_pattern) {
606 kfree(wr_buf);
607 DRM_DEBUG_DRIVER("Invalid Test Pattern Parameters\n");
608 return bytes_from_user;
609 }
610
611 if (test_pattern == DP_TEST_PATTERN_80BIT_CUSTOM) {
612 for (i = 0; i < 10; i++) {
613 if ((uint8_t) param[i + 1] != 0x0)
614 break;
615 }
616
617 if (i < 10) {
618 /* not use default value */
619 for (i = 0; i < 10; i++)
620 custom_pattern[i] = (uint8_t) param[i + 1];
621 }
622 }
623
624 /* Usage: set DP physical test pattern using debugfs with normal DP
625 * panel. Then plug out DP panel and connect a scope to measure
626 * For normal video mode and test pattern generated from CRCT,
627 * they are visibile to user. So do not disable HPD.
628 * Video Mode is also set to clear the test pattern, so enable HPD
629 * because it might have been disabled after a test pattern was set.
630 * AUX depends on HPD * sequence dependent, do not move!
631 */
632 if (!disable_hpd)
633 dc_link_enable_hpd(link);
634
635 prefer_link_settings.lane_count = link->verified_link_cap.lane_count;
636 prefer_link_settings.link_rate = link->verified_link_cap.link_rate;
637 prefer_link_settings.link_spread = link->verified_link_cap.link_spread;
638
639 cur_link_settings.lane_count = link->cur_link_settings.lane_count;
640 cur_link_settings.link_rate = link->cur_link_settings.link_rate;
641 cur_link_settings.link_spread = link->cur_link_settings.link_spread;
642
643 link_training_settings.link_settings = cur_link_settings;
644
645
646 if (test_pattern != DP_TEST_PATTERN_VIDEO_MODE) {
647 if (prefer_link_settings.lane_count != LANE_COUNT_UNKNOWN &&
648 prefer_link_settings.link_rate != LINK_RATE_UNKNOWN &&
649 (prefer_link_settings.lane_count != cur_link_settings.lane_count ||
650 prefer_link_settings.link_rate != cur_link_settings.link_rate))
651 link_training_settings.link_settings = prefer_link_settings;
652 }
653
654 for (i = 0; i < (unsigned int)(link_training_settings.link_settings.lane_count); i++)
655 link_training_settings.lane_settings[i] = link->cur_lane_setting;
656
657 dc_link_set_test_pattern(
658 link,
659 test_pattern,
660 &link_training_settings,
661 custom_pattern,
662 10);
663
664 /* Usage: Set DP physical test pattern using AMDDP with normal DP panel
665 * Then plug out DP panel and connect a scope to measure DP PHY signal.
666 * Need disable interrupt to avoid SW driver disable DP output. This is
667 * done after the test pattern is set.
668 */
669 if (valid_test_pattern && disable_hpd)
670 dc_link_disable_hpd(link);
671
672 kfree(wr_buf);
673
674 return bytes_from_user;
675}
676
677/*
678 * Returns the current and maximum output bpc for the connector.
679 * Example usage: cat /sys/kernel/debug/dri/0/DP-1/output_bpc
680 */
681static int output_bpc_show(struct seq_file *m, void *data)
682{
683 struct drm_connector *connector = m->private;
684 struct drm_device *dev = connector->dev;
685 struct drm_crtc *crtc = NULL;
686 struct dm_crtc_state *dm_crtc_state = NULL;
687 int res = -ENODEV;
688 unsigned int bpc;
689
690 mutex_lock(&dev->mode_config.mutex);
691 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
692
693 if (connector->state == NULL)
694 goto unlock;
695
696 crtc = connector->state->crtc;
697 if (crtc == NULL)
698 goto unlock;
699
700 drm_modeset_lock(&crtc->mutex, NULL);
701 if (crtc->state == NULL)
702 goto unlock;
703
704 dm_crtc_state = to_dm_crtc_state(crtc->state);
705 if (dm_crtc_state->stream == NULL)
706 goto unlock;
707
708 switch (dm_crtc_state->stream->timing.display_color_depth) {
709 case COLOR_DEPTH_666:
710 bpc = 6;
711 break;
712 case COLOR_DEPTH_888:
713 bpc = 8;
714 break;
715 case COLOR_DEPTH_101010:
716 bpc = 10;
717 break;
718 case COLOR_DEPTH_121212:
719 bpc = 12;
720 break;
721 case COLOR_DEPTH_161616:
722 bpc = 16;
723 break;
724 default:
725 goto unlock;
726 }
727
728 seq_printf(m, "Current: %u\n", bpc);
729 seq_printf(m, "Maximum: %u\n", connector->display_info.bpc);
730 res = 0;
731
732unlock:
733 if (crtc)
734 drm_modeset_unlock(&crtc->mutex);
735
736 drm_modeset_unlock(&dev->mode_config.connection_mutex);
737 mutex_unlock(&dev->mode_config.mutex);
738
739 return res;
740}
741
742/*
743 * Returns the min and max vrr vfreq through the connector's debugfs file.
744 * Example usage: cat /sys/kernel/debug/dri/0/DP-1/vrr_range
745 */
746static int vrr_range_show(struct seq_file *m, void *data)
747{
748 struct drm_connector *connector = m->private;
749 struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
750
751 if (connector->status != connector_status_connected)
752 return -ENODEV;
753
754 seq_printf(m, "Min: %u\n", (unsigned int)aconnector->min_vfreq);
755 seq_printf(m, "Max: %u\n", (unsigned int)aconnector->max_vfreq);
756
757 return 0;
758}
759
760/* function description
761 *
762 * generic SDP message access for testing
763 *
764 * debugfs sdp_message is located at /syskernel/debug/dri/0/DP-x
765 *
766 * SDP header
767 * Hb0 : Secondary-Data Packet ID
768 * Hb1 : Secondary-Data Packet type
769 * Hb2 : Secondary-Data-packet-specific header, Byte 0
770 * Hb3 : Secondary-Data-packet-specific header, Byte 1
771 *
772 * for using custom sdp message: input 4 bytes SDP header and 32 bytes raw data
773 */
774static ssize_t dp_sdp_message_debugfs_write(struct file *f, const char __user *buf,
775 size_t size, loff_t *pos)
776{
777 int r;
778 uint8_t data[36];
779 struct amdgpu_dm_connector *connector = file_inode(f)->i_private;
780 struct dm_crtc_state *acrtc_state;
781 uint32_t write_size = 36;
782
783 if (connector->base.status != connector_status_connected)
784 return -ENODEV;
785
786 if (size == 0)
787 return 0;
788
789 acrtc_state = to_dm_crtc_state(connector->base.state->crtc->state);
790
791 r = copy_from_user(data, buf, write_size);
792
793 write_size -= r;
794
795 dc_stream_send_dp_sdp(acrtc_state->stream, data, write_size);
796
797 return write_size;
798}
799
800static ssize_t dp_dpcd_address_write(struct file *f, const char __user *buf,
801 size_t size, loff_t *pos)
802{
803 int r;
804 struct amdgpu_dm_connector *connector = file_inode(f)->i_private;
805
806 if (size < sizeof(connector->debugfs_dpcd_address))
807 return 0;
808
809 r = copy_from_user(&connector->debugfs_dpcd_address,
810 buf, sizeof(connector->debugfs_dpcd_address));
811
812 return size - r;
813}
814
815static ssize_t dp_dpcd_size_write(struct file *f, const char __user *buf,
816 size_t size, loff_t *pos)
817{
818 int r;
819 struct amdgpu_dm_connector *connector = file_inode(f)->i_private;
820
821 if (size < sizeof(connector->debugfs_dpcd_size))
822 return 0;
823
824 r = copy_from_user(&connector->debugfs_dpcd_size,
825 buf, sizeof(connector->debugfs_dpcd_size));
826
827 if (connector->debugfs_dpcd_size > 256)
828 connector->debugfs_dpcd_size = 0;
829
830 return size - r;
831}
832
833static ssize_t dp_dpcd_data_write(struct file *f, const char __user *buf,
834 size_t size, loff_t *pos)
835{
836 int r;
837 char *data;
838 struct amdgpu_dm_connector *connector = file_inode(f)->i_private;
839 struct dc_link *link = connector->dc_link;
840 uint32_t write_size = connector->debugfs_dpcd_size;
841
842 if (size < write_size)
843 return 0;
844
845 data = kzalloc(write_size, GFP_KERNEL);
846 if (!data)
847 return 0;
848
849 r = copy_from_user(data, buf, write_size);
850
851 dm_helpers_dp_write_dpcd(link->ctx, link,
852 connector->debugfs_dpcd_address, data, write_size - r);
853 kfree(data);
854 return write_size - r;
855}
856
857static ssize_t dp_dpcd_data_read(struct file *f, char __user *buf,
858 size_t size, loff_t *pos)
859{
860 int r;
861 char *data;
862 struct amdgpu_dm_connector *connector = file_inode(f)->i_private;
863 struct dc_link *link = connector->dc_link;
864 uint32_t read_size = connector->debugfs_dpcd_size;
865
866 if (size < read_size)
867 return 0;
868
869 data = kzalloc(read_size, GFP_KERNEL);
870 if (!data)
871 return 0;
872
873 dm_helpers_dp_read_dpcd(link->ctx, link,
874 connector->debugfs_dpcd_address, data, read_size);
875
876 r = copy_to_user(buf, data, read_size);
877
878 kfree(data);
879 return read_size - r;
880}
881
882DEFINE_SHOW_ATTRIBUTE(output_bpc);
883DEFINE_SHOW_ATTRIBUTE(vrr_range);
884
885static const struct file_operations dp_link_settings_debugfs_fops = {
886 .owner = THIS_MODULE,
887 .read = dp_link_settings_read,
888 .write = dp_link_settings_write,
889 .llseek = default_llseek
890};
891
892static const struct file_operations dp_phy_settings_debugfs_fop = {
893 .owner = THIS_MODULE,
894 .read = dp_phy_settings_read,
895 .write = dp_phy_settings_write,
896 .llseek = default_llseek
897};
898
899static const struct file_operations dp_phy_test_pattern_fops = {
900 .owner = THIS_MODULE,
901 .write = dp_phy_test_pattern_debugfs_write,
902 .llseek = default_llseek
903};
904
905static const struct file_operations sdp_message_fops = {
906 .owner = THIS_MODULE,
907 .write = dp_sdp_message_debugfs_write,
908 .llseek = default_llseek
909};
910
911static const struct file_operations dp_dpcd_address_debugfs_fops = {
912 .owner = THIS_MODULE,
913 .write = dp_dpcd_address_write,
914 .llseek = default_llseek
915};
916
917static const struct file_operations dp_dpcd_size_debugfs_fops = {
918 .owner = THIS_MODULE,
919 .write = dp_dpcd_size_write,
920 .llseek = default_llseek
921};
922
923static const struct file_operations dp_dpcd_data_debugfs_fops = {
924 .owner = THIS_MODULE,
925 .read = dp_dpcd_data_read,
926 .write = dp_dpcd_data_write,
927 .llseek = default_llseek
928};
929
930static const struct {
931 char *name;
932 const struct file_operations *fops;
933} dp_debugfs_entries[] = {
934 {"link_settings", &dp_link_settings_debugfs_fops},
935 {"phy_settings", &dp_phy_settings_debugfs_fop},
936 {"test_pattern", &dp_phy_test_pattern_fops},
937 {"output_bpc", &output_bpc_fops},
938 {"vrr_range", &vrr_range_fops},
939 {"sdp_message", &sdp_message_fops},
940 {"aux_dpcd_address", &dp_dpcd_address_debugfs_fops},
941 {"aux_dpcd_size", &dp_dpcd_size_debugfs_fops},
942 {"aux_dpcd_data", &dp_dpcd_data_debugfs_fops}
943};
944
945void connector_debugfs_init(struct amdgpu_dm_connector *connector)
946{
947 int i;
948 struct dentry *dir = connector->base.debugfs_entry;
949
950 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
951 connector->base.connector_type == DRM_MODE_CONNECTOR_eDP) {
952 for (i = 0; i < ARRAY_SIZE(dp_debugfs_entries); i++) {
953 debugfs_create_file(dp_debugfs_entries[i].name,
954 0644, dir, connector,
955 dp_debugfs_entries[i].fops);
956 }
957 }
958}
959
960/*
961 * Writes DTN log state to the user supplied buffer.
962 * Example usage: cat /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log
963 */
964static ssize_t dtn_log_read(
965 struct file *f,
966 char __user *buf,
967 size_t size,
968 loff_t *pos)
969{
970 struct amdgpu_device *adev = file_inode(f)->i_private;
971 struct dc *dc = adev->dm.dc;
972 struct dc_log_buffer_ctx log_ctx = { 0 };
973 ssize_t result = 0;
974
975 if (!buf || !size)
976 return -EINVAL;
977
978 if (!dc->hwss.log_hw_state)
979 return 0;
980
981 dc->hwss.log_hw_state(dc, &log_ctx);
982
983 if (*pos < log_ctx.pos) {
984 size_t to_copy = log_ctx.pos - *pos;
985
986 to_copy = min(to_copy, size);
987
988 if (!copy_to_user(buf, log_ctx.buf + *pos, to_copy)) {
989 *pos += to_copy;
990 result = to_copy;
991 }
992 }
993
994 kfree(log_ctx.buf);
995
996 return result;
997}
998
999/*
1000 * Writes DTN log state to dmesg when triggered via a write.
1001 * Example usage: echo 1 > /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log
1002 */
1003static ssize_t dtn_log_write(
1004 struct file *f,
1005 const char __user *buf,
1006 size_t size,
1007 loff_t *pos)
1008{
1009 struct amdgpu_device *adev = file_inode(f)->i_private;
1010 struct dc *dc = adev->dm.dc;
1011
1012 /* Write triggers log output via dmesg. */
1013 if (size == 0)
1014 return 0;
1015
1016 if (dc->hwss.log_hw_state)
1017 dc->hwss.log_hw_state(dc, NULL);
1018
1019 return size;
1020}
1021
1022/*
1023 * Backlight at this moment. Read only.
1024 * As written to display, taking ABM and backlight lut into account.
1025 * Ranges from 0x0 to 0x10000 (= 100% PWM)
1026 */
1027static int current_backlight_read(struct seq_file *m, void *data)
1028{
1029 struct drm_info_node *node = (struct drm_info_node *)m->private;
1030 struct drm_device *dev = node->minor->dev;
1031 struct amdgpu_device *adev = dev->dev_private;
1032 struct dc *dc = adev->dm.dc;
1033 unsigned int backlight = dc_get_current_backlight_pwm(dc);
1034
1035 seq_printf(m, "0x%x\n", backlight);
1036 return 0;
1037}
1038
1039/*
1040 * Backlight value that is being approached. Read only.
1041 * As written to display, taking ABM and backlight lut into account.
1042 * Ranges from 0x0 to 0x10000 (= 100% PWM)
1043 */
1044static int target_backlight_read(struct seq_file *m, void *data)
1045{
1046 struct drm_info_node *node = (struct drm_info_node *)m->private;
1047 struct drm_device *dev = node->minor->dev;
1048 struct amdgpu_device *adev = dev->dev_private;
1049 struct dc *dc = adev->dm.dc;
1050 unsigned int backlight = dc_get_target_backlight_pwm(dc);
1051
1052 seq_printf(m, "0x%x\n", backlight);
1053 return 0;
1054}
1055
1056static int mst_topo(struct seq_file *m, void *unused)
1057{
1058 struct drm_info_node *node = (struct drm_info_node *)m->private;
1059 struct drm_device *dev = node->minor->dev;
1060 struct drm_connector *connector;
1061 struct drm_connector_list_iter conn_iter;
1062 struct amdgpu_dm_connector *aconnector;
1063
1064 drm_connector_list_iter_begin(dev, &conn_iter);
1065 drm_for_each_connector_iter(connector, &conn_iter) {
1066 if (connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort)
1067 continue;
1068
1069 aconnector = to_amdgpu_dm_connector(connector);
1070
1071 seq_printf(m, "\nMST topology for connector %d\n", aconnector->connector_id);
1072 drm_dp_mst_dump_topology(m, &aconnector->mst_mgr);
1073 }
1074 drm_connector_list_iter_end(&conn_iter);
1075
1076 return 0;
1077}
1078
1079static const struct drm_info_list amdgpu_dm_debugfs_list[] = {
1080 {"amdgpu_current_backlight_pwm", ¤t_backlight_read},
1081 {"amdgpu_target_backlight_pwm", &target_backlight_read},
1082 {"amdgpu_mst_topology", &mst_topo},
1083};
1084
1085/*
1086 * Sets the DC visual confirm debug option from the given string.
1087 * Example usage: echo 1 > /sys/kernel/debug/dri/0/amdgpu_visual_confirm
1088 */
1089static int visual_confirm_set(void *data, u64 val)
1090{
1091 struct amdgpu_device *adev = data;
1092
1093 adev->dm.dc->debug.visual_confirm = (enum visual_confirm)val;
1094
1095 return 0;
1096}
1097
1098/*
1099 * Reads the DC visual confirm debug option value into the given buffer.
1100 * Example usage: cat /sys/kernel/debug/dri/0/amdgpu_dm_visual_confirm
1101 */
1102static int visual_confirm_get(void *data, u64 *val)
1103{
1104 struct amdgpu_device *adev = data;
1105
1106 *val = adev->dm.dc->debug.visual_confirm;
1107
1108 return 0;
1109}
1110
1111DEFINE_DEBUGFS_ATTRIBUTE(visual_confirm_fops, visual_confirm_get,
1112 visual_confirm_set, "%llu\n");
1113
1114int dtn_debugfs_init(struct amdgpu_device *adev)
1115{
1116 static const struct file_operations dtn_log_fops = {
1117 .owner = THIS_MODULE,
1118 .read = dtn_log_read,
1119 .write = dtn_log_write,
1120 .llseek = default_llseek
1121 };
1122
1123 struct drm_minor *minor = adev->ddev->primary;
1124 struct dentry *root = minor->debugfs_root;
1125 int ret;
1126
1127 ret = amdgpu_debugfs_add_files(adev, amdgpu_dm_debugfs_list,
1128 ARRAY_SIZE(amdgpu_dm_debugfs_list));
1129 if (ret)
1130 return ret;
1131
1132 debugfs_create_file("amdgpu_dm_dtn_log", 0644, root, adev,
1133 &dtn_log_fops);
1134
1135 debugfs_create_file_unsafe("amdgpu_dm_visual_confirm", 0644, root, adev,
1136 &visual_confirm_fops);
1137
1138 return 0;
1139}