src/tdm_vblank.c

   1 /**************************************************************************
   2  *
   3  * libtdm
   4  *
   5  * Copyright 2015 Samsung Electronics co., Ltd. All Rights Reserved.
   6  *
   7  * Contact: Eunchul Kim <chulspro.kim@samsung.com>,
   8  *          JinYoung Jeon <jy0.jeon@samsung.com>,
   9  *          Taeheon Kim <th908.kim@samsung.com>,
  10  *          YoungJun Cho <yj44.cho@samsung.com>,
  11  *          SooChan Lim <sc1.lim@samsung.com>,
  12  *          Boram Park <sc1.lim@samsung.com>
  13  *
  14  * Permission is hereby granted, free of charge, to any person obtaining a
  15  * copy of this software and associated documentation files (the
  16  * "Software"), to deal in the Software without restriction, including
  17  * without limitation the rights to use, copy, modify, merge, publish,
  18  * distribute, sub license, and/or sell copies of the Software, and to
  19  * permit persons to whom the Software is furnished to do so, subject to
  20  * the following conditions:
  21  *
  22  * The above copyright notice and this permission notice (including the
  23  * next paragraph) shall be included in all copies or substantial portions
  24  * of the Software.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  27  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  29  * IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
  30  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  31  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  32  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  33  *
  34 **************************************************************************/
  35
  36 #ifdef HAVE_CONFIG_H
  37 #include "config.h"
  38 #endif
  39
  40 #include "tdm.h"
  41 #include "tdm_private.h"
  42 #include "tdm_list.h"
  43
  44 /* CAUTION:
  45  * tdm vblank doesn't care about thread things.
  46  * However, to use tdm_event_loop_xxx functions, have to use the internal function.
  47  * So need to lock/unlock the mutex of private_display.
  48  */
  49
  50 /* TDM vblank
  51  * - aligned by HW vblank
  52  * - use a tdm_event_loop_source object only.
  53  */
  54
  55 #define VER(fmt,arg...)   TDM_ERR("[%p] "fmt, private_vblank, ##arg)
  56 #define VWR(fmt,arg...)   TDM_WRN("[%p] "fmt, private_vblank, ##arg)
  57 #define VIN(fmt,arg...)   TDM_INFO("[%p] "fmt, private_vblank, ##arg)
  58 #define VDB(fmt,arg...)   TDM_DBG("[%p] "fmt, private_vblank, ##arg)
  59
  60 typedef struct _tdm_vblank_wait_info tdm_vblank_wait_info;
  61
  62 typedef struct _tdm_private_vblank {
  63         struct list_head link;
  64
  65         tdm_display *dpy;
  66         tdm_output *output;
  67         tdm_output_dpms dpms;
  68         unsigned int vrefresh;
  69
  70         unsigned int check_HW_or_SW;
  71         unsigned int fps;
  72         int offset;
  73         unsigned int enable_fake;
  74
  75         double vblank_gap;
  76         unsigned int last_seq;
  77         unsigned int last_tv_sec;
  78         unsigned int last_tv_usec;
  79
  80         /* for HW */
  81         double HW_vblank_gap;
  82         unsigned int HW_enable;
  83         unsigned int HW_quotient;
  84         struct list_head HW_wait_list;
  85
  86         /* for SW */
  87         tdm_event_loop_source *SW_timer;
  88         struct list_head SW_pending_wait_list;
  89         struct list_head SW_wait_list;
  90 #if 0
  91         tdm_vblank_wait_info *SW_align_wait;
  92         double SW_align_offset;
  93         unsigned int SW_align_sec;
  94         unsigned int SW_align_usec;
  95 #endif
  96 } tdm_private_vblank;
  97
  98 struct _tdm_vblank_wait_info {
  99         struct list_head link;
 100         struct list_head valid_link;
 101
 102         unsigned int stamp;
 103
 104         unsigned int req_sec;
 105         unsigned int req_usec;
 106         unsigned int interval;
 107
 108         tdm_vblank_handler func;
 109         void *user_data;
 110         tdm_private_vblank *private_vblank;
 111
 112         /* target_sec can be 0 when last_tv_sec is 0 because we can't calculate
 113          * target_sec without last_tv_sec. So we have to call tdm_output_wait_vblank
 114          * to fill last_tv_sec at the first time.
 115          */
 116         unsigned int target_sec;
 117         unsigned int target_usec;
 118         unsigned int target_seq;
 119         int target_hw_interval;
 120 };
 121
 122 static struct list_head vblank_list;
 123 static struct list_head valid_wait_list;
 124 static unsigned int vblank_list_inited;
 125 static unsigned int stamp = 0;
 126
 127 static tdm_error _tdm_vblank_wait_SW(tdm_vblank_wait_info *wait_info);
 128 #if 0
 129 static void _tdm_vblank_sw_timer_align(tdm_private_vblank *private_vblank);
 130 #endif
 131
 132 #if 0
 133 static void
 134 _print_list(struct list_head *list)
 135 {
 136         tdm_vblank_wait_info *w = NULL;
 137
 138         LIST_FOR_EACH_ENTRY(w, list, link) {
 139                 printf(" %d", w->interval);
 140         }
 141         printf("\n");
 142 }
 143 #endif
 144
 145 static inline unsigned int
 146 _tdm_vblank_check_valid(tdm_vblank_wait_info *wait_info)
 147 {
 148         tdm_vblank_wait_info *w = NULL;
 149
 150         if (!wait_info)
 151                 return 0;
 152
 153         LIST_FOR_EACH_ENTRY(w, &valid_wait_list, valid_link) {
 154                 if (w->stamp == wait_info->stamp)
 155                         return 1;
 156         }
 157
 158         return 0;
 159 }
 160
 161 static inline unsigned int
 162 _tdm_vblank_find_wait(tdm_vblank_wait_info *wait_info, struct list_head *list)
 163 {
 164         tdm_vblank_wait_info *w = NULL;
 165
 166         if (!wait_info)
 167                 return 0;
 168
 169         LIST_FOR_EACH_ENTRY(w, list, link) {
 170                 if (w->stamp == wait_info->stamp)
 171                         return 1;
 172         }
 173
 174         return 0;
 175 }
 176
 177 static inline void
 178 _tdm_vblank_insert_wait(tdm_vblank_wait_info *wait_info, struct list_head *list)
 179 {
 180         tdm_vblank_wait_info *w = NULL;
 181         tdm_vblank_wait_info *found = NULL;
 182
 183         if (LIST_IS_EMPTY(list)) {
 184                 LIST_ADDTAIL(&wait_info->link, list);
 185                 return;
 186         }
 187
 188         LIST_FOR_EACH_ENTRY(w, list, link) {
 189                 /* If last_tv_sec == 0, we can't calculate target_sec. */
 190                 if (wait_info->target_sec == 0) {
 191                         if (w->interval <= wait_info->interval) {
 192                                 found = w;
 193                                 continue;
 194                         }
 195                 } else {
 196                         if (w->target_sec < wait_info->target_sec) {
 197                                 found = w;
 198                                 continue;
 199                         }
 200                         if (w->target_sec == wait_info->target_sec && w->target_usec <= wait_info->target_usec) {
 201                                 found = w;
 202                                 continue;
 203                         }
 204                 }
 205         }
 206
 207         if (found)
 208                 LIST_ADD(&wait_info->link, &found->link);
 209         else
 210                 LIST_ADDTAIL(&wait_info->link, list->next);
 211 }
 212
 213 static void
 214 _tdm_vblank_change_to_SW(tdm_private_vblank *private_vblank)
 215 {
 216         tdm_vblank_wait_info *w = NULL, *ww = NULL;
 217
 218         VIN("Change to SW");
 219
 220         LIST_FOR_EACH_ENTRY_SAFE(w, ww, &private_vblank->HW_wait_list, link) {
 221                 LIST_DEL(&w->link);
 222                 _tdm_vblank_wait_SW(w);
 223         }
 224 }
 225
 226 static void
 227 _tdm_vblank_free_HW_wait(tdm_private_vblank *private_vblank, tdm_error error, unsigned int call_cb)
 228 {
 229         tdm_vblank_wait_info *w = NULL, *ww = NULL;
 230
 231         LIST_FOR_EACH_ENTRY_SAFE(w, ww, &private_vblank->HW_wait_list, link) {
 232                 LIST_DEL(&w->link);
 233                 LIST_DEL(&w->valid_link);
 234
 235                 if (call_cb && w->func)
 236                         w->func(private_vblank, error, 0, 0, 0, w->user_data);
 237
 238                 free(w);
 239         }
 240 }
 241
 242 static void
 243 _tdm_vblank_cb_output_change(tdm_output *output, tdm_output_change_type type,
 244                                                          tdm_value value, void *user_data)
 245 {
 246         tdm_private_vblank *private_vblank = user_data;
 247
 248         TDM_RETURN_IF_FAIL(private_vblank != NULL);
 249
 250         switch (type) {
 251         case TDM_OUTPUT_CHANGE_DPMS:
 252                 if (private_vblank->dpms == value.u32)
 253                         break;
 254                 VIN("dpms %s", tdm_dpms_str(value.u32));
 255                 private_vblank->dpms = value.u32;
 256                 private_vblank->check_HW_or_SW = 1;
 257                 if (private_vblank->dpms != TDM_OUTPUT_DPMS_ON) {
 258 #if 0
 259                         if (private_vblank->SW_align_wait) {
 260                                 LIST_DEL(&private_vblank->SW_align_wait->valid_link);
 261                                 free(private_vblank->SW_align_wait);
 262                                 private_vblank->SW_align_wait = NULL;
 263                         }
 264 #endif
 265
 266                         if (private_vblank->enable_fake)
 267                                 _tdm_vblank_change_to_SW(private_vblank);
 268                         else
 269                                 _tdm_vblank_free_HW_wait(private_vblank, TDM_ERROR_DPMS_OFF, 1);
 270                 }
 271                 break;
 272         case TDM_OUTPUT_CHANGE_CONNECTION:
 273                 VIN("output %s", tdm_status_str(value.u32));
 274                 if (value.u32 == TDM_OUTPUT_CONN_STATUS_DISCONNECTED)
 275                         _tdm_vblank_free_HW_wait(private_vblank, 0, 0);
 276                 break;
 277         default:
 278                 break;
 279         }
 280 }
 281
 282 tdm_vblank*
 283 tdm_vblank_create(tdm_display *dpy, tdm_output *output, tdm_error *error)
 284 {
 285         tdm_private_vblank *private_vblank;
 286         const tdm_output_mode *mode = NULL;
 287         tdm_output_dpms dpms = TDM_OUTPUT_DPMS_ON;
 288         tdm_error ret;
 289
 290         TDM_RETURN_VAL_IF_FAIL_WITH_ERROR(dpy != NULL, TDM_ERROR_INVALID_PARAMETER, NULL);
 291         TDM_RETURN_VAL_IF_FAIL_WITH_ERROR(output != NULL, TDM_ERROR_INVALID_PARAMETER, NULL);
 292
 293         if (error)
 294                 *error = TDM_ERROR_NONE;
 295
 296         if (!vblank_list_inited) {
 297                 LIST_INITHEAD(&vblank_list);
 298                 LIST_INITHEAD(&valid_wait_list);
 299                 vblank_list_inited = 1;
 300         }
 301
 302         tdm_output_get_mode(output, &mode);
 303         if (!mode) {
 304                 if (error)
 305                         *error = TDM_ERROR_OPERATION_FAILED;
 306                 TDM_ERR("no mode");
 307                 return NULL;
 308         }
 309
 310         tdm_output_get_dpms(output, &dpms);
 311
 312         private_vblank = calloc(1, sizeof *private_vblank);
 313         if (!private_vblank) {
 314                 if (error)
 315                         *error = TDM_ERROR_OUT_OF_MEMORY;
 316                 VER("alloc failed");
 317                 return NULL;
 318         }
 319
 320         tdm_output_add_change_handler(output, _tdm_vblank_cb_output_change, private_vblank);
 321
 322         private_vblank->dpy = dpy;
 323         private_vblank->output = output;
 324         private_vblank->dpms = dpms;
 325         private_vblank->vrefresh = mode->vrefresh;
 326         private_vblank->HW_vblank_gap = (double)1000000 / private_vblank->vrefresh;
 327
 328         private_vblank->check_HW_or_SW = 1;
 329         private_vblank->fps = mode->vrefresh;
 330
 331         LIST_INITHEAD(&private_vblank->HW_wait_list);
 332
 333         LIST_INITHEAD(&private_vblank->SW_pending_wait_list);
 334         LIST_INITHEAD(&private_vblank->SW_wait_list);
 335
 336         LIST_ADD(&private_vblank->link, &vblank_list);
 337
 338         VDB("created. vrefresh(%d) dpms(%d)",
 339                 private_vblank->vrefresh, private_vblank->dpms);
 340
 341         return (tdm_vblank*)private_vblank;
 342 }
 343
 344 void
 345 tdm_vblank_destroy(tdm_vblank *vblank)
 346 {
 347         tdm_private_vblank *private_vblank = vblank;
 348         tdm_vblank_wait_info *w = NULL, *ww = NULL;
 349
 350         if (!private_vblank)
 351                 return;
 352
 353         LIST_DEL(&private_vblank->link);
 354
 355 #if 0
 356         if (private_vblank->SW_align_wait) {
 357                 LIST_DEL(&private_vblank->SW_align_wait->valid_link);
 358                 free(private_vblank->SW_align_wait);
 359         }
 360 #endif
 361
 362         if (private_vblank->SW_timer) {
 363                 tdm_display_lock(private_vblank->dpy);
 364                 tdm_event_loop_source_remove(private_vblank->SW_timer);
 365                 tdm_display_unlock(private_vblank->dpy);
 366         }
 367
 368         tdm_output_remove_change_handler(private_vblank->output,
 369                                                                          _tdm_vblank_cb_output_change, private_vblank);
 370
 371         _tdm_vblank_free_HW_wait(private_vblank, 0, 0);
 372
 373         LIST_FOR_EACH_ENTRY_SAFE(w, ww, &private_vblank->SW_pending_wait_list, link) {
 374                 LIST_DEL(&w->link);
 375                 LIST_DEL(&w->valid_link);
 376                 free(w);
 377         }
 378
 379         LIST_FOR_EACH_ENTRY_SAFE(w, ww, &private_vblank->SW_wait_list, link) {
 380                 LIST_DEL(&w->link);
 381                 LIST_DEL(&w->valid_link);
 382                 free(w);
 383         }
 384
 385         VIN("destroyed");
 386
 387         free(private_vblank);
 388 }
 389
 390 tdm_error
 391 tdm_vblank_set_fps(tdm_vblank *vblank, unsigned int fps)
 392 {
 393         tdm_private_vblank *private_vblank = vblank;
 394
 395         TDM_RETURN_VAL_IF_FAIL(private_vblank != NULL, TDM_ERROR_INVALID_PARAMETER);
 396         TDM_RETURN_VAL_IF_FAIL(fps > 0, TDM_ERROR_INVALID_PARAMETER);
 397
 398         if (private_vblank->fps == fps)
 399                 return TDM_ERROR_NONE;
 400
 401         private_vblank->fps = fps;
 402         private_vblank->check_HW_or_SW = 1;
 403
 404         VDB("fps(%d)", private_vblank->fps);
 405
 406         return TDM_ERROR_NONE;
 407 }
 408
 409 tdm_error
 410 tdm_vblank_set_offset(tdm_vblank *vblank, int offset)
 411 {
 412         tdm_private_vblank *private_vblank = vblank;
 413
 414         TDM_RETURN_VAL_IF_FAIL(private_vblank != NULL, TDM_ERROR_INVALID_PARAMETER);
 415
 416         if (private_vblank->offset == offset)
 417                 return TDM_ERROR_NONE;
 418
 419         private_vblank->offset = offset;
 420         private_vblank->check_HW_or_SW = 1;
 421
 422         VDB("offset(%d)", private_vblank->offset);
 423
 424         return TDM_ERROR_NONE;
 425 }
 426
 427 tdm_error
 428 tdm_vblank_set_enable_fake(tdm_vblank *vblank, unsigned int enable_fake)
 429 {
 430         tdm_private_vblank *private_vblank = vblank;
 431
 432         TDM_RETURN_VAL_IF_FAIL(private_vblank != NULL, TDM_ERROR_INVALID_PARAMETER);
 433
 434         if (private_vblank->enable_fake == enable_fake)
 435                 return TDM_ERROR_NONE;
 436
 437         private_vblank->enable_fake = enable_fake;
 438
 439         VDB("enable_fake(%d)", private_vblank->enable_fake);
 440
 441         return TDM_ERROR_NONE;
 442 }
 443
 444 static void
 445 _tdm_vblank_cb_vblank_HW(tdm_output *output, unsigned int sequence,
 446                                                  unsigned int tv_sec, unsigned int tv_usec,
 447                                                  void *user_data)
 448 {
 449         tdm_vblank_wait_info *wait_info = user_data;
 450         tdm_private_vblank *private_vblank;
 451
 452         if (!_tdm_vblank_check_valid(wait_info)) {
 453                 TDM_DBG("can't find wait(%p) from valid_wait_list", wait_info);
 454                 return;
 455         }
 456
 457         private_vblank = wait_info->private_vblank;
 458         TDM_RETURN_IF_FAIL(private_vblank != NULL);
 459
 460         if (!_tdm_vblank_find_wait(wait_info, &private_vblank->HW_wait_list)) {
 461                 VDB("can't find wait(%p)", wait_info);
 462                 return;
 463         }
 464
 465         LIST_DEL(&wait_info->link);
 466         LIST_DEL(&wait_info->valid_link);
 467
 468         private_vblank->last_seq = wait_info->target_seq;
 469         private_vblank->last_tv_sec = tv_sec;
 470         private_vblank->last_tv_usec = tv_usec;
 471
 472         if (wait_info->func)
 473                 wait_info->func(private_vblank, TDM_ERROR_NONE, private_vblank->last_seq,
 474                                                 tv_sec, tv_usec, wait_info->user_data);
 475
 476         VDB("wait(%p) done", wait_info);
 477
 478         free(wait_info);
 479 }
 480
 481 static tdm_error
 482 _tdm_vblank_wait_HW(tdm_vblank_wait_info *wait_info)
 483 {
 484         tdm_private_vblank *private_vblank = wait_info->private_vblank;
 485         tdm_error ret;
 486
 487         TDM_RETURN_VAL_IF_FAIL(wait_info->target_hw_interval > 0, TDM_ERROR_OPERATION_FAILED);
 488
 489         _tdm_vblank_insert_wait(wait_info, &private_vblank->HW_wait_list);
 490
 491         ret = tdm_output_wait_vblank(private_vblank->output, wait_info->target_hw_interval, 0,
 492                                                                  _tdm_vblank_cb_vblank_HW, wait_info);
 493
 494         if (ret != TDM_ERROR_NONE) {
 495                 VWR("wait(%p) failed", wait_info);
 496                 LIST_DEL(&wait_info->link);
 497                 return ret;
 498         }
 499
 500         VDB("wait(%p) waiting", wait_info);
 501
 502         return TDM_ERROR_NONE;
 503 }
 504
 505 static tdm_error
 506 _tdm_vblank_cb_vblank_SW(void *user_data)
 507 {
 508         tdm_private_vblank *private_vblank = user_data;
 509         tdm_vblank_wait_info *first_wait_info = NULL, *w = NULL, *ww = NULL;
 510
 511         TDM_RETURN_VAL_IF_FAIL(private_vblank != NULL, TDM_ERROR_OPERATION_FAILED);
 512
 513         if (LIST_IS_EMPTY(&private_vblank->SW_wait_list)) {
 514                 VER("no wait_info");
 515                 return TDM_ERROR_OPERATION_FAILED;
 516         }
 517
 518         first_wait_info = container_of(private_vblank->SW_wait_list.next, first_wait_info, link);
 519         TDM_RETURN_VAL_IF_FAIL(first_wait_info != NULL, TDM_ERROR_OPERATION_FAILED);
 520
 521         VDB("wait(%p) done", first_wait_info);
 522
 523         private_vblank->last_seq = first_wait_info->target_seq;
 524         private_vblank->last_tv_sec = first_wait_info->target_sec;
 525         private_vblank->last_tv_usec = first_wait_info->target_usec;
 526
 527         LIST_FOR_EACH_ENTRY_SAFE(w, ww, &private_vblank->SW_wait_list, link) {
 528                 if (w->target_sec != first_wait_info->target_sec ||
 529                         w->target_usec != first_wait_info->target_usec)
 530                         break;
 531
 532                 LIST_DEL(&w->link);
 533                 LIST_DEL(&w->valid_link);
 534
 535                 if (w->func)
 536                         w->func(private_vblank, TDM_ERROR_NONE, w->target_seq,
 537                                         w->target_sec, w->target_usec,
 538                                         w->user_data);
 539
 540                 free(w);
 541         }
 542
 543         return TDM_ERROR_NONE;
 544 }
 545
 546 static void
 547 _tdm_vblank_cb_vblank_SW_first(tdm_output *output, unsigned int sequence,
 548                                                            unsigned int tv_sec, unsigned int tv_usec,
 549                                                            void *user_data)
 550 {
 551         tdm_vblank_wait_info *wait_info = user_data;
 552         tdm_private_vblank *private_vblank;
 553         tdm_vblank_wait_info *w = NULL, *ww = NULL;
 554         unsigned int min_interval = 0;
 555         unsigned long last;
 556
 557         if (!_tdm_vblank_check_valid(wait_info))
 558                 return;
 559
 560         private_vblank = wait_info->private_vblank;
 561         TDM_RETURN_IF_FAIL(private_vblank != NULL);
 562
 563         if (LIST_IS_EMPTY(&private_vblank->SW_pending_wait_list)) {
 564                 VER("no wait_info");
 565                 return;
 566         }
 567
 568         w = container_of((&private_vblank->SW_pending_wait_list)->next, w, link);
 569         TDM_RETURN_IF_FAIL(w != NULL);
 570
 571         VDB("wait(%p) done", w);
 572
 573         min_interval = w->interval;
 574
 575         last = (unsigned long)tv_sec * 1000000 + tv_usec;
 576         last -= private_vblank->offset * 1000;
 577
 578         private_vblank->last_seq = min_interval;
 579         private_vblank->last_tv_sec = last / 1000000;
 580         private_vblank->last_tv_usec = last % 1000000;
 581
 582         LIST_FOR_EACH_ENTRY_SAFE(w, ww, &private_vblank->SW_pending_wait_list, link) {
 583                 if (w->interval == min_interval) {
 584                         LIST_DEL(&w->link);
 585                         LIST_DEL(&w->valid_link);
 586
 587                         if (w->func)
 588                                 w->func(private_vblank, TDM_ERROR_NONE, private_vblank->last_seq,
 589                                                 tv_sec, tv_usec, w->user_data);
 590                         free(w);
 591                 } else {
 592                         LIST_DEL(&w->link);
 593                         w->interval -= min_interval;
 594                         _tdm_vblank_wait_SW(w);
 595                 }
 596         }
 597 }
 598
 599 static tdm_error
 600 _tdm_vblank_sw_timer_update(tdm_private_vblank *private_vblank)
 601 {
 602         tdm_vblank_wait_info *first_wait_info = NULL;
 603         unsigned long curr, target;
 604         int ms_delay;
 605         tdm_error ret;
 606
 607         if (LIST_IS_EMPTY(&private_vblank->SW_wait_list)) {
 608                 VER("no wait_info");
 609                 return TDM_ERROR_OPERATION_FAILED;
 610         }
 611
 612         first_wait_info = container_of(private_vblank->SW_wait_list.next, first_wait_info, link);
 613         curr = tdm_helper_get_time_in_micros();
 614         target = first_wait_info->target_sec * 1000000 + first_wait_info->target_usec;
 615
 616         if (target < curr)
 617                 ms_delay = 1;
 618         else
 619                 ms_delay = ceil((double)(target - curr) / 1000);
 620
 621         if (ms_delay < 1)
 622                 ms_delay = 1;
 623
 624         VDB("wait(%p) curr(%4lu) target(%4lu) ms_delay(%d)",
 625                 first_wait_info, curr, target, ms_delay);
 626
 627         tdm_display_lock(private_vblank->dpy);
 628
 629         if (!private_vblank->SW_timer) {
 630                 private_vblank->SW_timer =
 631                         tdm_event_loop_add_timer_handler(private_vblank->dpy,
 632                                                                                          _tdm_vblank_cb_vblank_SW,
 633                                                                                          private_vblank,
 634                                                                                          &ret);
 635                 if (!private_vblank->SW_timer) {
 636                         tdm_display_unlock(private_vblank->dpy);
 637                         VER("couldn't add timer");
 638                         return ret;
 639                 }
 640                 VIN("Use SW vblank");
 641         }
 642
 643         ret = tdm_event_loop_source_timer_update(private_vblank->SW_timer, ms_delay);
 644         if (ret != TDM_ERROR_NONE) {
 645                 tdm_display_unlock(private_vblank->dpy);
 646                 VER("couldn't update timer");
 647                 return ret;
 648         }
 649
 650         tdm_display_unlock(private_vblank->dpy);
 651
 652         return TDM_ERROR_NONE;
 653 }
 654
 655 #if 0
 656 static void
 657 _tdm_vblank_cb_vblank_align(tdm_output *output, unsigned int sequence,
 658                                                         unsigned int tv_sec, unsigned int tv_usec,
 659                                                         void *user_data)
 660 {
 661         tdm_vblank_wait_info *align_info = user_data;
 662         tdm_private_vblank *private_vblank;
 663         unsigned int diff_sec, diff_usec;
 664
 665         if (!_tdm_vblank_check_valid(align_info))
 666                 return;
 667
 668         private_vblank = align_info->private_vblank;
 669         TDM_RETURN_IF_FAIL(private_vblank != NULL);
 670
 671         private_vblank->SW_align_wait = NULL;
 672         private_vblank->SW_align_sec = tv_sec;
 673         private_vblank->SW_align_usec = tv_usec;
 674
 675         LIST_DEL(&align_info->valid_link);
 676
 677         if (tv_usec > align_info->req_usec) {
 678                 diff_usec = tv_usec - align_info->req_usec;
 679                 diff_sec = tv_sec - align_info->req_sec;
 680         } else {
 681                 diff_usec = 1000000 + tv_usec - align_info->req_usec;
 682                 diff_sec = tv_sec - align_info->req_sec - 1;
 683         }
 684
 685         private_vblank->SW_align_offset = (double)(1000000 - diff_sec * 1000000 - diff_usec) / private_vblank->vrefresh;
 686
 687         free(align_info);
 688
 689         /* align vblank continously only if non HW and DPMS on */
 690         if (!private_vblank->HW_enable && private_vblank->dpms == TDM_OUTPUT_DPMS_ON)
 691                 _tdm_vblank_sw_timer_align(private_vblank);
 692 }
 693
 694 static void
 695 _tdm_vblank_sw_timer_align(tdm_private_vblank *private_vblank)
 696 {
 697         tdm_vblank_wait_info *align_info;
 698         unsigned long curr;
 699         tdm_error ret;
 700
 701         if (private_vblank->SW_align_wait)
 702                 return;
 703
 704         TDM_RETURN_IF_FAIL(private_vblank->dpms == TDM_OUTPUT_DPMS_ON);
 705
 706         align_info = calloc(1, sizeof *align_info);
 707         if (!align_info) {
 708                 VER("alloc failed");
 709                 return;
 710         }
 711
 712         LIST_ADDTAIL(&align_info->valid_link, &valid_wait_list);
 713         align_info->stamp = ++stamp;
 714         align_info->private_vblank = private_vblank;
 715
 716         curr = tdm_helper_get_time_in_micros();
 717         align_info->req_sec = curr / 1000000;
 718         align_info->req_usec = curr % 1000000;
 719
 720         ret = tdm_output_wait_vblank(private_vblank->output, private_vblank->vrefresh, 0,
 721                                                                  _tdm_vblank_cb_vblank_align, align_info);
 722         if (ret != TDM_ERROR_NONE) {
 723                 LIST_DEL(&align_info->valid_link);
 724                 free(align_info);
 725                 return;
 726         }
 727
 728         private_vblank->SW_align_wait = align_info;
 729 }
 730 #endif
 731
 732 static tdm_error
 733 _tdm_vblank_wait_SW(tdm_vblank_wait_info *wait_info)
 734 {
 735         tdm_private_vblank *private_vblank = wait_info->private_vblank;
 736         tdm_error ret;
 737
 738         if (private_vblank->last_tv_sec == 0 && private_vblank->dpms == TDM_OUTPUT_DPMS_ON) {
 739                 unsigned int do_wait = LIST_IS_EMPTY(&private_vblank->SW_pending_wait_list);
 740                 _tdm_vblank_insert_wait(wait_info, &private_vblank->SW_pending_wait_list);
 741                 if (do_wait) {
 742                         ret = tdm_output_wait_vblank(private_vblank->output, 1, 0,
 743                                                                                  _tdm_vblank_cb_vblank_SW_first, wait_info);
 744                         if (ret == TDM_ERROR_DPMS_OFF) {
 745                                 TDM_WRN("use SW");
 746                                 goto use_sw;
 747                         }
 748                         if (ret != TDM_ERROR_NONE) {
 749                                 LIST_DEL(&wait_info->link);
 750                                 return ret;
 751                         }
 752                         VDB("wait(%p) waiting", wait_info);
 753                 }
 754                 return TDM_ERROR_NONE;
 755         }
 756
 757 use_sw:
 758         TDM_RETURN_VAL_IF_FAIL(wait_info->target_sec > 0, TDM_ERROR_OPERATION_FAILED);
 759
 760         _tdm_vblank_insert_wait(wait_info, &private_vblank->SW_wait_list);
 761
 762         ret = _tdm_vblank_sw_timer_update(private_vblank);
 763         if (ret != TDM_ERROR_NONE) {
 764                 LIST_DEL(&wait_info->link);
 765                 VER("couldn't update sw timer");
 766                 return ret;
 767         }
 768
 769         return TDM_ERROR_NONE;
 770 }
 771
 772 static void
 773 _tdm_vblank_calculate_target(tdm_vblank_wait_info *wait_info)
 774 {
 775         tdm_private_vblank *private_vblank = wait_info->private_vblank;
 776         unsigned long last, prev, req, curr, target;
 777         unsigned int skip = 0;
 778
 779         curr = tdm_helper_get_time_in_micros();
 780
 781         if (!private_vblank->HW_enable) {
 782                 if (private_vblank->last_tv_sec == 0) {
 783                         /* If last == 0 and DPMS == on, we will use HW vblank to sync with HW vblank. */
 784                         if (private_vblank->dpms == TDM_OUTPUT_DPMS_ON) {
 785                                 return;
 786                         } else {
 787                                 private_vblank->last_tv_sec = curr / 1000000;
 788                                 private_vblank->last_tv_usec = curr % 1000000;
 789                         }
 790                 }
 791         }
 792
 793         /* last can be 0 when HW enable. But it doesn't matter if HW enable. */
 794         if (!private_vblank->HW_enable)
 795                 TDM_RETURN_IF_FAIL(private_vblank->last_tv_sec != 0);
 796
 797         last = (unsigned long)private_vblank->last_tv_sec * 1000000 + private_vblank->last_tv_usec;
 798         req = (unsigned long)wait_info->req_sec * 1000000 + wait_info->req_usec;
 799         skip = (unsigned int)((req - last) / private_vblank->vblank_gap);
 800         prev = last + skip * private_vblank->vblank_gap;
 801
 802         if (private_vblank->last_seq == 0)
 803                 skip = 0;
 804
 805         skip += wait_info->interval;
 806
 807         if (private_vblank->HW_enable) {
 808                 unsigned int hw_skip = (unsigned int)((curr - prev) / private_vblank->HW_vblank_gap);
 809
 810                 wait_info->target_hw_interval = wait_info->interval * private_vblank->HW_quotient;
 811                 wait_info->target_hw_interval -= hw_skip;
 812
 813                 if (wait_info->target_hw_interval < 1)
 814                         wait_info->target_hw_interval = 1;
 815
 816                 target = prev + wait_info->target_hw_interval * private_vblank->HW_vblank_gap;
 817         } else {
 818                 target = prev + (unsigned long)(private_vblank->vblank_gap * wait_info->interval);
 819
 820                 while (target < curr) {
 821                         target += (unsigned long)private_vblank->vblank_gap;
 822                         skip++;
 823                 }
 824         }
 825
 826         VDB("target_seq(%d) last_seq(%d) skip(%d)",
 827                 wait_info->target_seq, private_vblank->last_seq, skip);
 828
 829 #if 0
 830         target -= (private_vblank->SW_align_offset * skip * private_vblank->HW_quotient);
 831 #endif
 832
 833         wait_info->target_seq = private_vblank->last_seq + skip;
 834         wait_info->target_sec = target / 1000000;
 835         wait_info->target_usec = target % 1000000;
 836
 837         VDB("wait(%p) last(%4lu) req(%4lu) prev(%4lu) curr(%4lu) skip(%d) hw_interval(%d) target(%4lu,%4lu)",
 838                 wait_info, last, req - last, prev - last, curr - last,
 839                 skip, wait_info->target_hw_interval, target, target - last);
 840 }
 841
 842 tdm_error
 843 tdm_vblank_wait(tdm_vblank *vblank, unsigned int req_sec, unsigned int req_usec,
 844                                 unsigned int interval, tdm_vblank_handler func, void *user_data)
 845 {
 846         tdm_private_vblank *private_vblank = vblank;
 847         tdm_vblank_wait_info *wait_info;
 848         tdm_error ret;
 849
 850         TDM_RETURN_VAL_IF_FAIL(private_vblank != NULL, TDM_ERROR_INVALID_PARAMETER);
 851         TDM_RETURN_VAL_IF_FAIL(func != NULL, TDM_ERROR_INVALID_PARAMETER);
 852
 853         if (private_vblank->dpms != TDM_OUTPUT_DPMS_ON && !private_vblank->enable_fake) {
 854                 VIN("can't wait a vblank because of DPMS off");
 855                 return TDM_ERROR_DPMS_OFF;
 856         }
 857
 858 #if 0
 859         if (!private_vblank->SW_align_wait && private_vblank->dpms == TDM_OUTPUT_DPMS_ON)
 860                 _tdm_vblank_sw_timer_align(private_vblank);
 861 #endif
 862
 863         if (private_vblank->check_HW_or_SW) {
 864                 private_vblank->check_HW_or_SW = 0;
 865                 private_vblank->vblank_gap = (double)1000000 / private_vblank->fps;
 866                 private_vblank->HW_quotient = private_vblank->vrefresh / private_vblank->fps;
 867
 868                 if (private_vblank->dpms == TDM_OUTPUT_DPMS_ON &&
 869                         !(private_vblank->vrefresh % private_vblank->fps)) {
 870                         private_vblank->HW_enable = 1;
 871                         VIN("Use HW vblank");
 872                 } else {
 873                         private_vblank->HW_enable = 0;
 874                         VIN("Use SW vblank");
 875                 }
 876         }
 877
 878         wait_info = calloc(1, sizeof *wait_info);
 879         if (!wait_info) {
 880                 VER("alloc failed");
 881                 return TDM_ERROR_OUT_OF_MEMORY;
 882         }
 883
 884         LIST_INITHEAD(&wait_info->link);
 885         LIST_ADDTAIL(&wait_info->valid_link, &valid_wait_list);
 886         wait_info->stamp = ++stamp;
 887         wait_info->req_sec = req_sec;
 888         wait_info->req_usec = req_usec;
 889         wait_info->interval = interval;
 890         wait_info->func = func;
 891         wait_info->user_data = user_data;
 892         wait_info->private_vblank = private_vblank;
 893
 894         _tdm_vblank_calculate_target(wait_info);
 895
 896         if (private_vblank->HW_enable) {
 897                 ret = _tdm_vblank_wait_HW(wait_info);
 898                 if (ret == TDM_ERROR_DPMS_OFF) {
 899                         TDM_WRN("try to use SW");
 900                         ret = _tdm_vblank_wait_SW(wait_info);
 901                 }
 902         }
 903         else
 904                 ret = _tdm_vblank_wait_SW(wait_info);
 905
 906         if (ret != TDM_ERROR_NONE) {
 907                 LIST_DEL(&wait_info->link);
 908                 LIST_DEL(&wait_info->valid_link);
 909                 free(wait_info);
 910                 return ret;
 911         }
 912
 913         return TDM_ERROR_NONE;
 914 }