1 /* $NetBSD: amdgpu_dm_debugfs.c,v 1.2 2021/12/18 23:45:00 riastradh Exp $ */ 2 3 /* 4 * Copyright 2018 Advanced Micro Devices, Inc. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 22 * OTHER DEALINGS IN THE SOFTWARE. 23 * 24 * Authors: AMD 25 * 26 */ 27 28 #include <sys/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: amdgpu_dm_debugfs.c,v 1.2 2021/12/18 23:45:00 riastradh Exp $"); 30 31 #include <linux/uaccess.h> 32 33 #include <drm/drm_debugfs.h> 34 35 #include "dc.h" 36 #include "amdgpu.h" 37 #include "amdgpu_dm.h" 38 #include "amdgpu_dm_debugfs.h" 39 #include "dm_helpers.h" 40 41 /* function description 42 * get/ set DP configuration: lane_count, link_rate, spread_spectrum 43 * 44 * valid lane count value: 1, 2, 4 45 * valid link rate value: 46 * 06h = 1.62Gbps per lane 47 * 0Ah = 2.7Gbps per lane 48 * 0Ch = 3.24Gbps per lane 49 * 14h = 5.4Gbps per lane 50 * 1Eh = 8.1Gbps per lane 51 * 52 * debugfs is located at /sys/kernel/debug/dri/0/DP-x/link_settings 53 * 54 * --- to get dp configuration 55 * 56 * cat link_settings 57 * 58 * It will list current, verified, reported, preferred dp configuration. 59 * current -- for current video mode 60 * verified --- maximum configuration which pass link training 61 * reported --- DP rx report caps (DPCD register offset 0, 1 2) 62 * preferred --- user force settings 63 * 64 * --- set (or force) dp configuration 65 * 66 * echo <lane_count> <link_rate> > link_settings 67 * 68 * for example, to force to 2 lane, 2.7GHz, 69 * echo 4 0xa > link_settings 70 * 71 * spread_spectrum could not be changed dynamically. 72 * 73 * in case invalid lane count, link rate are force, no hw programming will be 74 * done. please check link settings after force operation to see if HW get 75 * programming. 76 * 77 * cat link_settings 78 * 79 * check current and preferred settings. 80 * 81 */ 82 static ssize_t dp_link_settings_read(struct file *f, char __user *buf, 83 size_t size, loff_t *pos) 84 { 85 struct amdgpu_dm_connector *connector = file_inode(f)->i_private; 86 struct dc_link *link = connector->dc_link; 87 char *rd_buf = NULL; 88 char *rd_buf_ptr = NULL; 89 const uint32_t rd_buf_size = 100; 90 uint32_t result = 0; 91 uint8_t str_len = 0; 92 int r; 93 94 if (*pos & 3 || size & 3) 95 return -EINVAL; 96 97 rd_buf = kcalloc(rd_buf_size, sizeof(char), GFP_KERNEL); 98 if (!rd_buf) 99 return 0; 100 101 rd_buf_ptr = rd_buf; 102 103 str_len = strlen("Current: %d %d %d "); 104 snprintf(rd_buf_ptr, str_len, "Current: %d %d %d ", 105 link->cur_link_settings.lane_count, 106 link->cur_link_settings.link_rate, 107 link->cur_link_settings.link_spread); 108 rd_buf_ptr += str_len; 109 110 str_len = strlen("Verified: %d %d %d "); 111 snprintf(rd_buf_ptr, str_len, "Verified: %d %d %d ", 112 link->verified_link_cap.lane_count, 113 link->verified_link_cap.link_rate, 114 link->verified_link_cap.link_spread); 115 rd_buf_ptr += str_len; 116 117 str_len = strlen("Reported: %d %d %d "); 118 snprintf(rd_buf_ptr, str_len, "Reported: %d %d %d ", 119 link->reported_link_cap.lane_count, 120 link->reported_link_cap.link_rate, 121 link->reported_link_cap.link_spread); 122 rd_buf_ptr += str_len; 123 124 str_len = strlen("Preferred: %d %d %d "); 125 snprintf(rd_buf_ptr, str_len, "Preferred: %d %d %d\n", 126 link->preferred_link_setting.lane_count, 127 link->preferred_link_setting.link_rate, 128 link->preferred_link_setting.link_spread); 129 130 while (size) { 131 if (*pos >= rd_buf_size) 132 break; 133 134 r = put_user(*(rd_buf + result), buf); 135 if (r) 136 return r; /* r = -EFAULT */ 137 138 buf += 1; 139 size -= 1; 140 *pos += 1; 141 result += 1; 142 } 143 144 kfree(rd_buf); 145 return result; 146 } 147 148 static ssize_t dp_link_settings_write(struct file *f, const char __user *buf, 149 size_t size, loff_t *pos) 150 { 151 struct amdgpu_dm_connector *connector = file_inode(f)->i_private; 152 struct dc_link *link = connector->dc_link; 153 struct dc *dc = (struct dc *)link->dc; 154 struct dc_link_settings prefer_link_settings; 155 char *wr_buf = NULL; 156 char *wr_buf_ptr = NULL; 157 const uint32_t wr_buf_size = 40; 158 int r; 159 int bytes_from_user; 160 char *sub_str; 161 /* 0: lane_count; 1: link_rate */ 162 uint8_t param_index = 0; 163 long param[2]; 164 const char delimiter[3] = {' ', '\n', '\0'}; 165 bool valid_input = false; 166 167 if (size == 0) 168 return -EINVAL; 169 170 wr_buf = kcalloc(wr_buf_size, sizeof(char), GFP_KERNEL); 171 if (!wr_buf) 172 return -EINVAL; 173 wr_buf_ptr = wr_buf; 174 175 r = copy_from_user(wr_buf_ptr, buf, wr_buf_size); 176 177 /* r is bytes not be copied */ 178 if (r >= wr_buf_size) { 179 kfree(wr_buf); 180 DRM_DEBUG_DRIVER("user data not read\n"); 181 return -EINVAL; 182 } 183 184 bytes_from_user = wr_buf_size - r; 185 186 while (isspace(*wr_buf_ptr)) 187 wr_buf_ptr++; 188 189 while ((*wr_buf_ptr != '\0') && (param_index < 2)) { 190 191 sub_str = strsep(&wr_buf_ptr, delimiter); 192 193 r = kstrtol(sub_str, 16, ¶m[param_index]); 194 195 if (r) 196 DRM_DEBUG_DRIVER("string to int convert error code: %d\n", r); 197 198 param_index++; 199 while (isspace(*wr_buf_ptr)) 200 wr_buf_ptr++; 201 } 202 203 switch (param[0]) { 204 case LANE_COUNT_ONE: 205 case LANE_COUNT_TWO: 206 case LANE_COUNT_FOUR: 207 valid_input = true; 208 break; 209 default: 210 break; 211 } 212 213 switch (param[1]) { 214 case LINK_RATE_LOW: 215 case LINK_RATE_HIGH: 216 case LINK_RATE_RBR2: 217 case LINK_RATE_HIGH2: 218 case LINK_RATE_HIGH3: 219 valid_input = true; 220 break; 221 default: 222 break; 223 } 224 225 if (!valid_input) { 226 kfree(wr_buf); 227 DRM_DEBUG_DRIVER("Invalid Input value No HW will be programmed\n"); 228 return bytes_from_user; 229 } 230 231 /* save user force lane_count, link_rate to preferred settings 232 * spread spectrum will not be changed 233 */ 234 prefer_link_settings.link_spread = link->cur_link_settings.link_spread; 235 prefer_link_settings.lane_count = param[0]; 236 prefer_link_settings.link_rate = param[1]; 237 238 dc_link_set_preferred_link_settings(dc, &prefer_link_settings, link); 239 240 kfree(wr_buf); 241 return bytes_from_user; 242 } 243 244 /* function: get current DP PHY settings: voltage swing, pre-emphasis, 245 * post-cursor2 (defined by VESA DP specification) 246 * 247 * valid values 248 * voltage swing: 0,1,2,3 249 * pre-emphasis : 0,1,2,3 250 * post cursor2 : 0,1,2,3 251 * 252 * 253 * how to use this debugfs 254 * 255 * debugfs is located at /sys/kernel/debug/dri/0/DP-x 256 * 257 * there will be directories, like DP-1, DP-2,DP-3, etc. for DP display 258 * 259 * To figure out which DP-x is the display for DP to be check, 260 * cd DP-x 261 * ls -ll 262 * There should be debugfs file, like link_settings, phy_settings. 263 * cat link_settings 264 * from lane_count, link_rate to figure which DP-x is for display to be worked 265 * on 266 * 267 * To get current DP PHY settings, 268 * cat phy_settings 269 * 270 * To change DP PHY settings, 271 * echo <voltage_swing> <pre-emphasis> <post_cursor2> > phy_settings 272 * for examle, to change voltage swing to 2, pre-emphasis to 3, post_cursor2 to 273 * 0, 274 * echo 2 3 0 > phy_settings 275 * 276 * To check if change be applied, get current phy settings by 277 * cat phy_settings 278 * 279 * In case invalid values are set by user, like 280 * echo 1 4 0 > phy_settings 281 * 282 * HW will NOT be programmed by these settings. 283 * cat phy_settings will show the previous valid settings. 284 */ 285 static ssize_t dp_phy_settings_read(struct file *f, char __user *buf, 286 size_t size, loff_t *pos) 287 { 288 struct amdgpu_dm_connector *connector = file_inode(f)->i_private; 289 struct dc_link *link = connector->dc_link; 290 char *rd_buf = NULL; 291 const uint32_t rd_buf_size = 20; 292 uint32_t result = 0; 293 int r; 294 295 if (*pos & 3 || size & 3) 296 return -EINVAL; 297 298 rd_buf = kcalloc(rd_buf_size, sizeof(char), GFP_KERNEL); 299 if (!rd_buf) 300 return -EINVAL; 301 302 snprintf(rd_buf, rd_buf_size, " %d %d %d ", 303 link->cur_lane_setting.VOLTAGE_SWING, 304 link->cur_lane_setting.PRE_EMPHASIS, 305 link->cur_lane_setting.POST_CURSOR2); 306 307 while (size) { 308 if (*pos >= rd_buf_size) 309 break; 310 311 r = put_user((*(rd_buf + result)), buf); 312 if (r) 313 return r; /* r = -EFAULT */ 314 315 buf += 1; 316 size -= 1; 317 *pos += 1; 318 result += 1; 319 } 320 321 kfree(rd_buf); 322 return result; 323 } 324 325 static ssize_t dp_phy_settings_write(struct file *f, const char __user *buf, 326 size_t size, loff_t *pos) 327 { 328 struct amdgpu_dm_connector *connector = file_inode(f)->i_private; 329 struct dc_link *link = connector->dc_link; 330 struct dc *dc = (struct dc *)link->dc; 331 char *wr_buf = NULL; 332 char *wr_buf_ptr = NULL; 333 uint32_t wr_buf_size = 40; 334 int r; 335 int bytes_from_user; 336 char *sub_str; 337 uint8_t param_index = 0; 338 long param[3]; 339 const char delimiter[3] = {' ', '\n', '\0'}; 340 bool use_prefer_link_setting; 341 struct link_training_settings link_lane_settings; 342 343 if (size == 0) 344 return 0; 345 346 wr_buf = kcalloc(wr_buf_size, sizeof(char), GFP_KERNEL); 347 if (!wr_buf) 348 return 0; 349 wr_buf_ptr = wr_buf; 350 351 r = copy_from_user(wr_buf_ptr, buf, wr_buf_size); 352 353 /* r is bytes not be copied */ 354 if (r >= wr_buf_size) { 355 kfree(wr_buf); 356 DRM_DEBUG_DRIVER("user data not be read\n"); 357 return 0; 358 } 359 360 bytes_from_user = wr_buf_size - r; 361 362 while (isspace(*wr_buf_ptr)) 363 wr_buf_ptr++; 364 365 while ((*wr_buf_ptr != '\0') && (param_index < 3)) { 366 367 sub_str = strsep(&wr_buf_ptr, delimiter); 368 369 r = kstrtol(sub_str, 16, ¶m[param_index]); 370 371 if (r) 372 DRM_DEBUG_DRIVER("string to int convert error code: %d\n", r); 373 374 param_index++; 375 while (isspace(*wr_buf_ptr)) 376 wr_buf_ptr++; 377 } 378 379 if ((param[0] > VOLTAGE_SWING_MAX_LEVEL) || 380 (param[1] > PRE_EMPHASIS_MAX_LEVEL) || 381 (param[2] > POST_CURSOR2_MAX_LEVEL)) { 382 kfree(wr_buf); 383 DRM_DEBUG_DRIVER("Invalid Input No HW will be programmed\n"); 384 return bytes_from_user; 385 } 386 387 /* get link settings: lane count, link rate */ 388 use_prefer_link_setting = 389 ((link->preferred_link_setting.link_rate != LINK_RATE_UNKNOWN) && 390 (link->test_pattern_enabled)); 391 392 memset(&link_lane_settings, 0, sizeof(link_lane_settings)); 393 394 if (use_prefer_link_setting) { 395 link_lane_settings.link_settings.lane_count = 396 link->preferred_link_setting.lane_count; 397 link_lane_settings.link_settings.link_rate = 398 link->preferred_link_setting.link_rate; 399 link_lane_settings.link_settings.link_spread = 400 link->preferred_link_setting.link_spread; 401 } else { 402 link_lane_settings.link_settings.lane_count = 403 link->cur_link_settings.lane_count; 404 link_lane_settings.link_settings.link_rate = 405 link->cur_link_settings.link_rate; 406 link_lane_settings.link_settings.link_spread = 407 link->cur_link_settings.link_spread; 408 } 409 410 /* apply phy settings from user */ 411 for (r = 0; r < link_lane_settings.link_settings.lane_count; r++) { 412 link_lane_settings.lane_settings[r].VOLTAGE_SWING = 413 (enum dc_voltage_swing) (param[0]); 414 link_lane_settings.lane_settings[r].PRE_EMPHASIS = 415 (enum dc_pre_emphasis) (param[1]); 416 link_lane_settings.lane_settings[r].POST_CURSOR2 = 417 (enum dc_post_cursor2) (param[2]); 418 } 419 420 /* program ASIC registers and DPCD registers */ 421 dc_link_set_drive_settings(dc, &link_lane_settings, link); 422 423 kfree(wr_buf); 424 return bytes_from_user; 425 } 426 427 /* function description 428 * 429 * set PHY layer or Link layer test pattern 430 * PHY test pattern is used for PHY SI check. 431 * Link layer test will not affect PHY SI. 432 * 433 * Reset Test Pattern: 434 * 0 = DP_TEST_PATTERN_VIDEO_MODE 435 * 436 * PHY test pattern supported: 437 * 1 = DP_TEST_PATTERN_D102 438 * 2 = DP_TEST_PATTERN_SYMBOL_ERROR 439 * 3 = DP_TEST_PATTERN_PRBS7 440 * 4 = DP_TEST_PATTERN_80BIT_CUSTOM 441 * 5 = DP_TEST_PATTERN_CP2520_1 442 * 6 = DP_TEST_PATTERN_CP2520_2 = DP_TEST_PATTERN_HBR2_COMPLIANCE_EYE 443 * 7 = DP_TEST_PATTERN_CP2520_3 444 * 445 * DP PHY Link Training Patterns 446 * 8 = DP_TEST_PATTERN_TRAINING_PATTERN1 447 * 9 = DP_TEST_PATTERN_TRAINING_PATTERN2 448 * a = DP_TEST_PATTERN_TRAINING_PATTERN3 449 * b = DP_TEST_PATTERN_TRAINING_PATTERN4 450 * 451 * DP Link Layer Test pattern 452 * c = DP_TEST_PATTERN_COLOR_SQUARES 453 * d = DP_TEST_PATTERN_COLOR_SQUARES_CEA 454 * e = DP_TEST_PATTERN_VERTICAL_BARS 455 * f = DP_TEST_PATTERN_HORIZONTAL_BARS 456 * 10= DP_TEST_PATTERN_COLOR_RAMP 457 * 458 * debugfs phy_test_pattern is located at /syskernel/debug/dri/0/DP-x 459 * 460 * --- set test pattern 461 * echo <test pattern #> > test_pattern 462 * 463 * If test pattern # is not supported, NO HW programming will be done. 464 * for DP_TEST_PATTERN_80BIT_CUSTOM, it needs extra 10 bytes of data 465 * for the user pattern. input 10 bytes data are separated by space 466 * 467 * echo 0x4 0x11 0x22 0x33 0x44 0x55 0x66 0x77 0x88 0x99 0xaa > test_pattern 468 * 469 * --- reset test pattern 470 * echo 0 > test_pattern 471 * 472 * --- HPD detection is disabled when set PHY test pattern 473 * 474 * when PHY test pattern (pattern # within [1,7]) is set, HPD pin of HW ASIC 475 * is disable. User could unplug DP display from DP connected and plug scope to 476 * check test pattern PHY SI. 477 * If there is need unplug scope and plug DP display back, do steps below: 478 * echo 0 > phy_test_pattern 479 * unplug scope 480 * plug DP display. 481 * 482 * "echo 0 > phy_test_pattern" will re-enable HPD pin again so that video sw 483 * driver could detect "unplug scope" and "plug DP display" 484 */ 485 static ssize_t dp_phy_test_pattern_debugfs_write(struct file *f, const char __user *buf, 486 size_t size, loff_t *pos) 487 { 488 struct amdgpu_dm_connector *connector = file_inode(f)->i_private; 489 struct dc_link *link = connector->dc_link; 490 char *wr_buf = NULL; 491 char *wr_buf_ptr = NULL; 492 uint32_t wr_buf_size = 100; 493 uint32_t wr_buf_count = 0; 494 int r; 495 int bytes_from_user; 496 char *sub_str = NULL; 497 uint8_t param_index = 0; 498 uint8_t param_nums = 0; 499 long param[11] = {0x0}; 500 const char delimiter[3] = {' ', '\n', '\0'}; 501 enum dp_test_pattern test_pattern = DP_TEST_PATTERN_UNSUPPORTED; 502 bool disable_hpd = false; 503 bool valid_test_pattern = false; 504 /* init with defalut 80bit custom pattern */ 505 uint8_t custom_pattern[10] = { 506 0x1f, 0x7c, 0xf0, 0xc1, 0x07, 507 0x1f, 0x7c, 0xf0, 0xc1, 0x07 508 }; 509 struct dc_link_settings prefer_link_settings = {LANE_COUNT_UNKNOWN, 510 LINK_RATE_UNKNOWN, LINK_SPREAD_DISABLED}; 511 struct dc_link_settings cur_link_settings = {LANE_COUNT_UNKNOWN, 512 LINK_RATE_UNKNOWN, LINK_SPREAD_DISABLED}; 513 struct link_training_settings link_training_settings; 514 int i; 515 516 if (size == 0) 517 return 0; 518 519 wr_buf = kcalloc(wr_buf_size, sizeof(char), GFP_KERNEL); 520 if (!wr_buf) 521 return 0; 522 wr_buf_ptr = wr_buf; 523 524 r = copy_from_user(wr_buf_ptr, buf, wr_buf_size); 525 526 /* r is bytes not be copied */ 527 if (r >= wr_buf_size) { 528 kfree(wr_buf); 529 DRM_DEBUG_DRIVER("user data not be read\n"); 530 return 0; 531 } 532 533 bytes_from_user = wr_buf_size - r; 534 535 /* check number of parameters. isspace could not differ space and \n */ 536 while ((*wr_buf_ptr != 0xa) && (wr_buf_count < wr_buf_size)) { 537 /* skip space*/ 538 while (isspace(*wr_buf_ptr) && (wr_buf_count < wr_buf_size)) { 539 wr_buf_ptr++; 540 wr_buf_count++; 541 } 542 543 if (wr_buf_count == wr_buf_size) 544 break; 545 546 /* skip non-space*/ 547 while ((!isspace(*wr_buf_ptr)) && (wr_buf_count < wr_buf_size)) { 548 wr_buf_ptr++; 549 wr_buf_count++; 550 } 551 552 param_nums++; 553 554 if (wr_buf_count == wr_buf_size) 555 break; 556 } 557 558 /* max 11 parameters */ 559 if (param_nums > 11) 560 param_nums = 11; 561 562 wr_buf_ptr = wr_buf; /* reset buf pinter */ 563 wr_buf_count = 0; /* number of char already checked */ 564 565 while (isspace(*wr_buf_ptr) && (wr_buf_count < wr_buf_size)) { 566 wr_buf_ptr++; 567 wr_buf_count++; 568 } 569 570 while (param_index < param_nums) { 571 /* after strsep, wr_buf_ptr will be moved to after space */ 572 sub_str = strsep(&wr_buf_ptr, delimiter); 573 574 r = kstrtol(sub_str, 16, ¶m[param_index]); 575 576 if (r) 577 DRM_DEBUG_DRIVER("string to int convert error code: %d\n", r); 578 579 param_index++; 580 } 581 582 test_pattern = param[0]; 583 584 switch (test_pattern) { 585 case DP_TEST_PATTERN_VIDEO_MODE: 586 case DP_TEST_PATTERN_COLOR_SQUARES: 587 case DP_TEST_PATTERN_COLOR_SQUARES_CEA: 588 case DP_TEST_PATTERN_VERTICAL_BARS: 589 case DP_TEST_PATTERN_HORIZONTAL_BARS: 590 case DP_TEST_PATTERN_COLOR_RAMP: 591 valid_test_pattern = true; 592 break; 593 594 case DP_TEST_PATTERN_D102: 595 case DP_TEST_PATTERN_SYMBOL_ERROR: 596 case DP_TEST_PATTERN_PRBS7: 597 case DP_TEST_PATTERN_80BIT_CUSTOM: 598 case DP_TEST_PATTERN_HBR2_COMPLIANCE_EYE: 599 case DP_TEST_PATTERN_TRAINING_PATTERN4: 600 disable_hpd = true; 601 valid_test_pattern = true; 602 break; 603 604 default: 605 valid_test_pattern = false; 606 test_pattern = DP_TEST_PATTERN_UNSUPPORTED; 607 break; 608 } 609 610 if (!valid_test_pattern) { 611 kfree(wr_buf); 612 DRM_DEBUG_DRIVER("Invalid Test Pattern Parameters\n"); 613 return bytes_from_user; 614 } 615 616 if (test_pattern == DP_TEST_PATTERN_80BIT_CUSTOM) { 617 for (i = 0; i < 10; i++) { 618 if ((uint8_t) param[i + 1] != 0x0) 619 break; 620 } 621 622 if (i < 10) { 623 /* not use default value */ 624 for (i = 0; i < 10; i++) 625 custom_pattern[i] = (uint8_t) param[i + 1]; 626 } 627 } 628 629 /* Usage: set DP physical test pattern using debugfs with normal DP 630 * panel. Then plug out DP panel and connect a scope to measure 631 * For normal video mode and test pattern generated from CRCT, 632 * they are visibile to user. So do not disable HPD. 633 * Video Mode is also set to clear the test pattern, so enable HPD 634 * because it might have been disabled after a test pattern was set. 635 * AUX depends on HPD * sequence dependent, do not move! 636 */ 637 if (!disable_hpd) 638 dc_link_enable_hpd(link); 639 640 prefer_link_settings.lane_count = link->verified_link_cap.lane_count; 641 prefer_link_settings.link_rate = link->verified_link_cap.link_rate; 642 prefer_link_settings.link_spread = link->verified_link_cap.link_spread; 643 644 cur_link_settings.lane_count = link->cur_link_settings.lane_count; 645 cur_link_settings.link_rate = link->cur_link_settings.link_rate; 646 cur_link_settings.link_spread = link->cur_link_settings.link_spread; 647 648 link_training_settings.link_settings = cur_link_settings; 649 650 651 if (test_pattern != DP_TEST_PATTERN_VIDEO_MODE) { 652 if (prefer_link_settings.lane_count != LANE_COUNT_UNKNOWN && 653 prefer_link_settings.link_rate != LINK_RATE_UNKNOWN && 654 (prefer_link_settings.lane_count != cur_link_settings.lane_count || 655 prefer_link_settings.link_rate != cur_link_settings.link_rate)) 656 link_training_settings.link_settings = prefer_link_settings; 657 } 658 659 for (i = 0; i < (unsigned int)(link_training_settings.link_settings.lane_count); i++) 660 link_training_settings.lane_settings[i] = link->cur_lane_setting; 661 662 dc_link_set_test_pattern( 663 link, 664 test_pattern, 665 DP_TEST_PATTERN_COLOR_SPACE_RGB, 666 &link_training_settings, 667 custom_pattern, 668 10); 669 670 /* Usage: Set DP physical test pattern using AMDDP with normal DP panel 671 * Then plug out DP panel and connect a scope to measure DP PHY signal. 672 * Need disable interrupt to avoid SW driver disable DP output. This is 673 * done after the test pattern is set. 674 */ 675 if (valid_test_pattern && disable_hpd) 676 dc_link_disable_hpd(link); 677 678 kfree(wr_buf); 679 680 return bytes_from_user; 681 } 682 683 /* 684 * Returns the current and maximum output bpc for the connector. 685 * Example usage: cat /sys/kernel/debug/dri/0/DP-1/output_bpc 686 */ 687 static int output_bpc_show(struct seq_file *m, void *data) 688 { 689 struct drm_connector *connector = m->private; 690 struct drm_device *dev = connector->dev; 691 struct drm_crtc *crtc = NULL; 692 struct dm_crtc_state *dm_crtc_state = NULL; 693 int res = -ENODEV; 694 unsigned int bpc; 695 696 mutex_lock(&dev->mode_config.mutex); 697 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); 698 699 if (connector->state == NULL) 700 goto unlock; 701 702 crtc = connector->state->crtc; 703 if (crtc == NULL) 704 goto unlock; 705 706 drm_modeset_lock(&crtc->mutex, NULL); 707 if (crtc->state == NULL) 708 goto unlock; 709 710 dm_crtc_state = to_dm_crtc_state(crtc->state); 711 if (dm_crtc_state->stream == NULL) 712 goto unlock; 713 714 switch (dm_crtc_state->stream->timing.display_color_depth) { 715 case COLOR_DEPTH_666: 716 bpc = 6; 717 break; 718 case COLOR_DEPTH_888: 719 bpc = 8; 720 break; 721 case COLOR_DEPTH_101010: 722 bpc = 10; 723 break; 724 case COLOR_DEPTH_121212: 725 bpc = 12; 726 break; 727 case COLOR_DEPTH_161616: 728 bpc = 16; 729 break; 730 default: 731 goto unlock; 732 } 733 734 seq_printf(m, "Current: %u\n", bpc); 735 seq_printf(m, "Maximum: %u\n", connector->display_info.bpc); 736 res = 0; 737 738 unlock: 739 if (crtc) 740 drm_modeset_unlock(&crtc->mutex); 741 742 drm_modeset_unlock(&dev->mode_config.connection_mutex); 743 mutex_unlock(&dev->mode_config.mutex); 744 745 return res; 746 } 747 748 /* 749 * Returns the min and max vrr vfreq through the connector's debugfs file. 750 * Example usage: cat /sys/kernel/debug/dri/0/DP-1/vrr_range 751 */ 752 static int vrr_range_show(struct seq_file *m, void *data) 753 { 754 struct drm_connector *connector = m->private; 755 struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector); 756 757 if (connector->status != connector_status_connected) 758 return -ENODEV; 759 760 seq_printf(m, "Min: %u\n", (unsigned int)aconnector->min_vfreq); 761 seq_printf(m, "Max: %u\n", (unsigned int)aconnector->max_vfreq); 762 763 return 0; 764 } 765 766 /* function description 767 * 768 * generic SDP message access for testing 769 * 770 * debugfs sdp_message is located at /syskernel/debug/dri/0/DP-x 771 * 772 * SDP header 773 * Hb0 : Secondary-Data Packet ID 774 * Hb1 : Secondary-Data Packet type 775 * Hb2 : Secondary-Data-packet-specific header, Byte 0 776 * Hb3 : Secondary-Data-packet-specific header, Byte 1 777 * 778 * for using custom sdp message: input 4 bytes SDP header and 32 bytes raw data 779 */ 780 static ssize_t dp_sdp_message_debugfs_write(struct file *f, const char __user *buf, 781 size_t size, loff_t *pos) 782 { 783 int r; 784 uint8_t data[36]; 785 struct amdgpu_dm_connector *connector = file_inode(f)->i_private; 786 struct dm_crtc_state *acrtc_state; 787 uint32_t write_size = 36; 788 789 if (connector->base.status != connector_status_connected) 790 return -ENODEV; 791 792 if (size == 0) 793 return 0; 794 795 acrtc_state = to_dm_crtc_state(connector->base.state->crtc->state); 796 797 r = copy_from_user(data, buf, write_size); 798 799 write_size -= r; 800 801 dc_stream_send_dp_sdp(acrtc_state->stream, data, write_size); 802 803 return write_size; 804 } 805 806 static ssize_t dp_dpcd_address_write(struct file *f, const char __user *buf, 807 size_t size, loff_t *pos) 808 { 809 int r; 810 struct amdgpu_dm_connector *connector = file_inode(f)->i_private; 811 812 if (size < sizeof(connector->debugfs_dpcd_address)) 813 return 0; 814 815 r = copy_from_user(&connector->debugfs_dpcd_address, 816 buf, sizeof(connector->debugfs_dpcd_address)); 817 818 return size - r; 819 } 820 821 static ssize_t dp_dpcd_size_write(struct file *f, const char __user *buf, 822 size_t size, loff_t *pos) 823 { 824 int r; 825 struct amdgpu_dm_connector *connector = file_inode(f)->i_private; 826 827 if (size < sizeof(connector->debugfs_dpcd_size)) 828 return 0; 829 830 r = copy_from_user(&connector->debugfs_dpcd_size, 831 buf, sizeof(connector->debugfs_dpcd_size)); 832 833 if (connector->debugfs_dpcd_size > 256) 834 connector->debugfs_dpcd_size = 0; 835 836 return size - r; 837 } 838 839 static ssize_t dp_dpcd_data_write(struct file *f, const char __user *buf, 840 size_t size, loff_t *pos) 841 { 842 int r; 843 char *data; 844 struct amdgpu_dm_connector *connector = file_inode(f)->i_private; 845 struct dc_link *link = connector->dc_link; 846 uint32_t write_size = connector->debugfs_dpcd_size; 847 848 if (size < write_size) 849 return 0; 850 851 data = kzalloc(write_size, GFP_KERNEL); 852 if (!data) 853 return 0; 854 855 r = copy_from_user(data, buf, write_size); 856 857 dm_helpers_dp_write_dpcd(link->ctx, link, 858 connector->debugfs_dpcd_address, data, write_size - r); 859 kfree(data); 860 return write_size - r; 861 } 862 863 static ssize_t dp_dpcd_data_read(struct file *f, char __user *buf, 864 size_t size, loff_t *pos) 865 { 866 int r; 867 char *data; 868 struct amdgpu_dm_connector *connector = file_inode(f)->i_private; 869 struct dc_link *link = connector->dc_link; 870 uint32_t read_size = connector->debugfs_dpcd_size; 871 872 if (size < read_size) 873 return 0; 874 875 data = kzalloc(read_size, GFP_KERNEL); 876 if (!data) 877 return 0; 878 879 dm_helpers_dp_read_dpcd(link->ctx, link, 880 connector->debugfs_dpcd_address, data, read_size); 881 882 r = copy_to_user(buf, data, read_size); 883 884 kfree(data); 885 return read_size - r; 886 } 887 888 DEFINE_SHOW_ATTRIBUTE(output_bpc); 889 DEFINE_SHOW_ATTRIBUTE(vrr_range); 890 891 static const struct file_operations dp_link_settings_debugfs_fops = { 892 .owner = THIS_MODULE, 893 .read = dp_link_settings_read, 894 .write = dp_link_settings_write, 895 .llseek = default_llseek 896 }; 897 898 static const struct file_operations dp_phy_settings_debugfs_fop = { 899 .owner = THIS_MODULE, 900 .read = dp_phy_settings_read, 901 .write = dp_phy_settings_write, 902 .llseek = default_llseek 903 }; 904 905 static const struct file_operations dp_phy_test_pattern_fops = { 906 .owner = THIS_MODULE, 907 .write = dp_phy_test_pattern_debugfs_write, 908 .llseek = default_llseek 909 }; 910 911 static const struct file_operations sdp_message_fops = { 912 .owner = THIS_MODULE, 913 .write = dp_sdp_message_debugfs_write, 914 .llseek = default_llseek 915 }; 916 917 static const struct file_operations dp_dpcd_address_debugfs_fops = { 918 .owner = THIS_MODULE, 919 .write = dp_dpcd_address_write, 920 .llseek = default_llseek 921 }; 922 923 static const struct file_operations dp_dpcd_size_debugfs_fops = { 924 .owner = THIS_MODULE, 925 .write = dp_dpcd_size_write, 926 .llseek = default_llseek 927 }; 928 929 static const struct file_operations dp_dpcd_data_debugfs_fops = { 930 .owner = THIS_MODULE, 931 .read = dp_dpcd_data_read, 932 .write = dp_dpcd_data_write, 933 .llseek = default_llseek 934 }; 935 936 static const struct { 937 char *name; 938 const struct file_operations *fops; 939 } dp_debugfs_entries[] = { 940 {"link_settings", &dp_link_settings_debugfs_fops}, 941 {"phy_settings", &dp_phy_settings_debugfs_fop}, 942 {"test_pattern", &dp_phy_test_pattern_fops}, 943 {"output_bpc", &output_bpc_fops}, 944 {"vrr_range", &vrr_range_fops}, 945 {"sdp_message", &sdp_message_fops}, 946 {"aux_dpcd_address", &dp_dpcd_address_debugfs_fops}, 947 {"aux_dpcd_size", &dp_dpcd_size_debugfs_fops}, 948 {"aux_dpcd_data", &dp_dpcd_data_debugfs_fops} 949 }; 950 951 /* 952 * Force YUV420 output if available from the given mode 953 */ 954 static int force_yuv420_output_set(void *data, u64 val) 955 { 956 struct amdgpu_dm_connector *connector = data; 957 958 connector->force_yuv420_output = (bool)val; 959 960 return 0; 961 } 962 963 /* 964 * Check if YUV420 is forced when available from the given mode 965 */ 966 static int force_yuv420_output_get(void *data, u64 *val) 967 { 968 struct amdgpu_dm_connector *connector = data; 969 970 *val = connector->force_yuv420_output; 971 972 return 0; 973 } 974 975 DEFINE_DEBUGFS_ATTRIBUTE(force_yuv420_output_fops, force_yuv420_output_get, 976 force_yuv420_output_set, "%llu\n"); 977 978 /* 979 * Read PSR state 980 */ 981 static int psr_get(void *data, u64 *val) 982 { 983 struct amdgpu_dm_connector *connector = data; 984 struct dc_link *link = connector->dc_link; 985 uint32_t psr_state = 0; 986 987 dc_link_get_psr_state(link, &psr_state); 988 989 *val = psr_state; 990 991 return 0; 992 } 993 994 995 DEFINE_DEBUGFS_ATTRIBUTE(psr_fops, psr_get, NULL, "%llu\n"); 996 997 void connector_debugfs_init(struct amdgpu_dm_connector *connector) 998 { 999 int i; 1000 struct dentry *dir = connector->base.debugfs_entry; 1001 1002 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DisplayPort || 1003 connector->base.connector_type == DRM_MODE_CONNECTOR_eDP) { 1004 for (i = 0; i < ARRAY_SIZE(dp_debugfs_entries); i++) { 1005 debugfs_create_file(dp_debugfs_entries[i].name, 1006 0644, dir, connector, 1007 dp_debugfs_entries[i].fops); 1008 } 1009 } 1010 if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP) 1011 debugfs_create_file_unsafe("psr_state", 0444, dir, connector, &psr_fops); 1012 1013 debugfs_create_file_unsafe("force_yuv420_output", 0644, dir, connector, 1014 &force_yuv420_output_fops); 1015 1016 } 1017 1018 /* 1019 * Writes DTN log state to the user supplied buffer. 1020 * Example usage: cat /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log 1021 */ 1022 static ssize_t dtn_log_read( 1023 struct file *f, 1024 char __user *buf, 1025 size_t size, 1026 loff_t *pos) 1027 { 1028 struct amdgpu_device *adev = file_inode(f)->i_private; 1029 struct dc *dc = adev->dm.dc; 1030 struct dc_log_buffer_ctx log_ctx = { 0 }; 1031 ssize_t result = 0; 1032 1033 if (!buf || !size) 1034 return -EINVAL; 1035 1036 if (!dc->hwss.log_hw_state) 1037 return 0; 1038 1039 dc->hwss.log_hw_state(dc, &log_ctx); 1040 1041 if (*pos < log_ctx.pos) { 1042 size_t to_copy = log_ctx.pos - *pos; 1043 1044 to_copy = min(to_copy, size); 1045 1046 if (!copy_to_user(buf, log_ctx.buf + *pos, to_copy)) { 1047 *pos += to_copy; 1048 result = to_copy; 1049 } 1050 } 1051 1052 kfree(log_ctx.buf); 1053 1054 return result; 1055 } 1056 1057 /* 1058 * Writes DTN log state to dmesg when triggered via a write. 1059 * Example usage: echo 1 > /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log 1060 */ 1061 static ssize_t dtn_log_write( 1062 struct file *f, 1063 const char __user *buf, 1064 size_t size, 1065 loff_t *pos) 1066 { 1067 struct amdgpu_device *adev = file_inode(f)->i_private; 1068 struct dc *dc = adev->dm.dc; 1069 1070 /* Write triggers log output via dmesg. */ 1071 if (size == 0) 1072 return 0; 1073 1074 if (dc->hwss.log_hw_state) 1075 dc->hwss.log_hw_state(dc, NULL); 1076 1077 return size; 1078 } 1079 1080 /* 1081 * Backlight at this moment. Read only. 1082 * As written to display, taking ABM and backlight lut into account. 1083 * Ranges from 0x0 to 0x10000 (= 100% PWM) 1084 */ 1085 static int current_backlight_read(struct seq_file *m, void *data) 1086 { 1087 struct drm_info_node *node = (struct drm_info_node *)m->private; 1088 struct drm_device *dev = node->minor->dev; 1089 struct amdgpu_device *adev = dev->dev_private; 1090 struct dc *dc = adev->dm.dc; 1091 unsigned int backlight = dc_get_current_backlight_pwm(dc); 1092 1093 seq_printf(m, "0x%x\n", backlight); 1094 return 0; 1095 } 1096 1097 /* 1098 * Backlight value that is being approached. Read only. 1099 * As written to display, taking ABM and backlight lut into account. 1100 * Ranges from 0x0 to 0x10000 (= 100% PWM) 1101 */ 1102 static int target_backlight_read(struct seq_file *m, void *data) 1103 { 1104 struct drm_info_node *node = (struct drm_info_node *)m->private; 1105 struct drm_device *dev = node->minor->dev; 1106 struct amdgpu_device *adev = dev->dev_private; 1107 struct dc *dc = adev->dm.dc; 1108 unsigned int backlight = dc_get_target_backlight_pwm(dc); 1109 1110 seq_printf(m, "0x%x\n", backlight); 1111 return 0; 1112 } 1113 1114 static int mst_topo(struct seq_file *m, void *unused) 1115 { 1116 struct drm_info_node *node = (struct drm_info_node *)m->private; 1117 struct drm_device *dev = node->minor->dev; 1118 struct drm_connector *connector; 1119 struct drm_connector_list_iter conn_iter; 1120 struct amdgpu_dm_connector *aconnector; 1121 1122 drm_connector_list_iter_begin(dev, &conn_iter); 1123 drm_for_each_connector_iter(connector, &conn_iter) { 1124 if (connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort) 1125 continue; 1126 1127 aconnector = to_amdgpu_dm_connector(connector); 1128 1129 seq_printf(m, "\nMST topology for connector %d\n", aconnector->connector_id); 1130 drm_dp_mst_dump_topology(m, &aconnector->mst_mgr); 1131 } 1132 drm_connector_list_iter_end(&conn_iter); 1133 1134 return 0; 1135 } 1136 1137 static const struct drm_info_list amdgpu_dm_debugfs_list[] = { 1138 {"amdgpu_current_backlight_pwm", ¤t_backlight_read}, 1139 {"amdgpu_target_backlight_pwm", &target_backlight_read}, 1140 {"amdgpu_mst_topology", &mst_topo}, 1141 }; 1142 1143 /* 1144 * Sets the DC visual confirm debug option from the given string. 1145 * Example usage: echo 1 > /sys/kernel/debug/dri/0/amdgpu_visual_confirm 1146 */ 1147 static int visual_confirm_set(void *data, u64 val) 1148 { 1149 struct amdgpu_device *adev = data; 1150 1151 adev->dm.dc->debug.visual_confirm = (enum visual_confirm)val; 1152 1153 return 0; 1154 } 1155 1156 /* 1157 * Reads the DC visual confirm debug option value into the given buffer. 1158 * Example usage: cat /sys/kernel/debug/dri/0/amdgpu_dm_visual_confirm 1159 */ 1160 static int visual_confirm_get(void *data, u64 *val) 1161 { 1162 struct amdgpu_device *adev = data; 1163 1164 *val = adev->dm.dc->debug.visual_confirm; 1165 1166 return 0; 1167 } 1168 1169 DEFINE_DEBUGFS_ATTRIBUTE(visual_confirm_fops, visual_confirm_get, 1170 visual_confirm_set, "%llu\n"); 1171 1172 int dtn_debugfs_init(struct amdgpu_device *adev) 1173 { 1174 static const struct file_operations dtn_log_fops = { 1175 .owner = THIS_MODULE, 1176 .read = dtn_log_read, 1177 .write = dtn_log_write, 1178 .llseek = default_llseek 1179 }; 1180 1181 struct drm_minor *minor = adev->ddev->primary; 1182 struct dentry *root = minor->debugfs_root; 1183 int ret; 1184 1185 ret = amdgpu_debugfs_add_files(adev, amdgpu_dm_debugfs_list, 1186 ARRAY_SIZE(amdgpu_dm_debugfs_list)); 1187 if (ret) 1188 return ret; 1189 1190 debugfs_create_file("amdgpu_dm_dtn_log", 0644, root, adev, 1191 &dtn_log_fops); 1192 1193 debugfs_create_file_unsafe("amdgpu_dm_visual_confirm", 0644, root, adev, 1194 &visual_confirm_fops); 1195 1196 return 0; 1197 } 1198
Indexes created Sun Sep 21 16:09:51 GMT 2025