root/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c

DEFINITIONS

1. dp_link_settings_read
2. dp_link_settings_write
3. dp_phy_settings_read
4. dp_phy_settings_write
5. dp_phy_test_pattern_debugfs_write
6. output_bpc_show
7. vrr_range_show
8. dp_sdp_message_debugfs_write
9. dp_dpcd_address_write
10. dp_dpcd_size_write
11. dp_dpcd_data_write
12. dp_dpcd_data_read
13. connector_debugfs_init
14. dtn_log_read
15. dtn_log_write
16. current_backlight_read
17. target_backlight_read
18. mst_topo
19. visual_confirm_set
20. visual_confirm_get
21. dtn_debugfs_init

   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  */
  77 static 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 
 143 static 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, &param[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  */
 280 static 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 
 320 static 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, &param[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  */
 480 static 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, &param[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  */
 681 static 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 
 732 unlock:
 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  */
 746 static 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  */
 774 static 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 
 800 static 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 
 815 static 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 
 833 static 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 
 857 static 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 
 882 DEFINE_SHOW_ATTRIBUTE(output_bpc);
 883 DEFINE_SHOW_ATTRIBUTE(vrr_range);
 884 
 885 static 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 
 892 static 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 
 899 static 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 
 905 static const struct file_operations sdp_message_fops = {
 906         .owner = THIS_MODULE,
 907         .write = dp_sdp_message_debugfs_write,
 908         .llseek = default_llseek
 909 };
 910 
 911 static 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 
 917 static 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 
 923 static 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 
 930 static 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 
 945 void 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  */
 964 static 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  */
1003 static 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  */
1027 static 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  */
1044 static 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 
1056 static 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 
1079 static const struct drm_info_list amdgpu_dm_debugfs_list[] = {
1080         {"amdgpu_current_backlight_pwm", &current_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  */
1089 static 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  */
1102 static 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 
1111 DEFINE_DEBUGFS_ATTRIBUTE(visual_confirm_fops, visual_confirm_get,
1112                          visual_confirm_set, "%llu\n");
1113 
1114 int 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 }