src/gallium/state_trackers/egl/drm/modeset.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.9
   4  *
   5  * Copyright (C) 2010 LunarG Inc.
   6  * Copyright (C) 2011 VMware Inc. All rights reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  24  * DEALINGS IN THE SOFTWARE.
  25  *
  26  * Authors:
  27  *    Chia-I Wu <olv@lunarg.com>
  28  *    Thomas Hellstrom <thellstrom@vmware.com>
  29  */
  30
  31 #include "util/u_memory.h"
  32 #include "util/u_inlines.h"
  33 #include "egllog.h"
  34
  35 #include "native_drm.h"
  36
  37 static boolean
  38 drm_surface_validate(struct native_surface *nsurf, uint attachment_mask,
  39                      unsigned int *seq_num, struct pipe_resource **textures,
  40                      int *width, int *height)
  41 {
  42    struct drm_surface *drmsurf = drm_surface(nsurf);
  43
  44    if (!resource_surface_add_resources(drmsurf->rsurf, attachment_mask))
  45       return FALSE;
  46    if (textures)
  47       resource_surface_get_resources(drmsurf->rsurf, textures, attachment_mask);
  48
  49    if (seq_num)
  50       *seq_num = drmsurf->sequence_number;
  51    if (width)
  52       *width = drmsurf->width;
  53    if (height)
  54       *height = drmsurf->height;
  55
  56    return TRUE;
  57 }
  58
  59 /**
  60  * Add textures as DRM framebuffers.
  61  */
  62 static boolean
  63 drm_surface_init_framebuffers(struct native_surface *nsurf, boolean need_back)
  64 {
  65    struct drm_surface *drmsurf = drm_surface(nsurf);
  66    struct drm_display *drmdpy = drmsurf->drmdpy;
  67    int num_framebuffers = (need_back) ? 2 : 1;
  68    int i, err;
  69
  70    for (i = 0; i < num_framebuffers; i++) {
  71       struct drm_framebuffer *fb;
  72       enum native_attachment natt;
  73       struct winsys_handle whandle;
  74       uint block_bits;
  75
  76       if (i == 0) {
  77          fb = &drmsurf->front_fb;
  78          natt = NATIVE_ATTACHMENT_FRONT_LEFT;
  79       }
  80       else {
  81          fb = &drmsurf->back_fb;
  82          natt = NATIVE_ATTACHMENT_BACK_LEFT;
  83       }
  84
  85       if (!fb->texture) {
  86          /* make sure the texture has been allocated */
  87          resource_surface_add_resources(drmsurf->rsurf, 1 << natt);
  88          fb->texture =
  89             resource_surface_get_single_resource(drmsurf->rsurf, natt);
  90          if (!fb->texture)
  91             return FALSE;
  92       }
  93
  94       /* already initialized */
  95       if (fb->buffer_id)
  96          continue;
  97
  98       /* TODO detect the real value */
  99       fb->is_passive = TRUE;
 100
 101       memset(&whandle, 0, sizeof(whandle));
 102       whandle.type = DRM_API_HANDLE_TYPE_KMS;
 103
 104       if (!drmdpy->base.screen->resource_get_handle(drmdpy->base.screen,
 105                fb->texture, &whandle))
 106          return FALSE;
 107
 108       block_bits = util_format_get_blocksizebits(drmsurf->color_format);
 109       err = drmModeAddFB(drmdpy->fd, drmsurf->width, drmsurf->height,
 110             block_bits, block_bits, whandle.stride, whandle.handle,
 111             &fb->buffer_id);
 112       if (err) {
 113          fb->buffer_id = 0;
 114          return FALSE;
 115       }
 116    }
 117
 118    return TRUE;
 119 }
 120
 121 static boolean
 122 drm_surface_flush_frontbuffer(struct native_surface *nsurf)
 123 {
 124 #ifdef DRM_MODE_FEATURE_DIRTYFB
 125    struct drm_surface *drmsurf = drm_surface(nsurf);
 126    struct drm_display *drmdpy = drmsurf->drmdpy;
 127
 128    if (drmsurf->front_fb.is_passive)
 129       drmModeDirtyFB(drmdpy->fd, drmsurf->front_fb.buffer_id, NULL, 0);
 130 #endif
 131
 132    return TRUE;
 133 }
 134
 135 static boolean
 136 drm_surface_copy_swap(struct native_surface *nsurf)
 137 {
 138    struct drm_surface *drmsurf = drm_surface(nsurf);
 139    struct drm_display *drmdpy = drmsurf->drmdpy;
 140
 141    (void) resource_surface_throttle(drmsurf->rsurf);
 142    if (!resource_surface_copy_swap(drmsurf->rsurf, &drmdpy->base))
 143       return FALSE;
 144
 145    (void) resource_surface_flush(drmsurf->rsurf, &drmdpy->base);
 146    if (!drm_surface_flush_frontbuffer(nsurf))
 147       return FALSE;
 148
 149    drmsurf->sequence_number++;
 150
 151    return TRUE;
 152 }
 153
 154 static boolean
 155 drm_surface_swap_buffers(struct native_surface *nsurf)
 156 {
 157    struct drm_surface *drmsurf = drm_surface(nsurf);
 158    struct drm_crtc *drmcrtc = &drmsurf->current_crtc;
 159    struct drm_display *drmdpy = drmsurf->drmdpy;
 160    struct drm_framebuffer tmp_fb;
 161    int err;
 162
 163    if (!drmsurf->have_pageflip)
 164       return drm_surface_copy_swap(nsurf);
 165
 166    if (!drmsurf->back_fb.buffer_id) {
 167       if (!drm_surface_init_framebuffers(&drmsurf->base, TRUE))
 168          return FALSE;
 169    }
 170
 171    if (drmsurf->is_shown && drmcrtc->crtc) {
 172       err = drmModePageFlip(drmdpy->fd, drmcrtc->crtc->crtc_id,
 173                             drmsurf->back_fb.buffer_id, 0, NULL);
 174       if (err) {
 175          drmsurf->have_pageflip = FALSE;
 176          return drm_surface_copy_swap(nsurf);
 177       }
 178    }
 179
 180    /* swap the buffers */
 181    tmp_fb = drmsurf->front_fb;
 182    drmsurf->front_fb = drmsurf->back_fb;
 183    drmsurf->back_fb = tmp_fb;
 184
 185    resource_surface_swap_buffers(drmsurf->rsurf,
 186          NATIVE_ATTACHMENT_FRONT_LEFT, NATIVE_ATTACHMENT_BACK_LEFT, FALSE);
 187    /* the front/back textures are swapped */
 188    drmsurf->sequence_number++;
 189    drmdpy->event_handler->invalid_surface(&drmdpy->base,
 190          &drmsurf->base, drmsurf->sequence_number);
 191
 192    return TRUE;
 193 }
 194
 195 static boolean
 196 drm_surface_present(struct native_surface *nsurf,
 197                     const struct native_present_control *ctrl)
 198 {
 199    boolean ret;
 200
 201    if (ctrl->swap_interval)
 202       return FALSE;
 203
 204    switch (ctrl->natt) {
 205    case NATIVE_ATTACHMENT_FRONT_LEFT:
 206       ret = drm_surface_flush_frontbuffer(nsurf);
 207       break;
 208    case NATIVE_ATTACHMENT_BACK_LEFT:
 209       if (ctrl->preserve)
 210          ret = drm_surface_copy_swap(nsurf);
 211       else
 212          ret = drm_surface_swap_buffers(nsurf);
 213       break;
 214    default:
 215       ret = FALSE;
 216       break;
 217    }
 218
 219    return ret;
 220 }
 221
 222 static void
 223 drm_surface_wait(struct native_surface *nsurf)
 224 {
 225    struct drm_surface *drmsurf = drm_surface(nsurf);
 226
 227    resource_surface_wait(drmsurf->rsurf);
 228 }
 229
 230 static void
 231 drm_surface_destroy(struct native_surface *nsurf)
 232 {
 233    struct drm_surface *drmsurf = drm_surface(nsurf);
 234
 235    resource_surface_wait(drmsurf->rsurf);
 236    if (drmsurf->current_crtc.crtc)
 237          drmModeFreeCrtc(drmsurf->current_crtc.crtc);
 238
 239    if (drmsurf->front_fb.buffer_id)
 240       drmModeRmFB(drmsurf->drmdpy->fd, drmsurf->front_fb.buffer_id);
 241    pipe_resource_reference(&drmsurf->front_fb.texture, NULL);
 242
 243    if (drmsurf->back_fb.buffer_id)
 244       drmModeRmFB(drmsurf->drmdpy->fd, drmsurf->back_fb.buffer_id);
 245    pipe_resource_reference(&drmsurf->back_fb.texture, NULL);
 246
 247    resource_surface_destroy(drmsurf->rsurf);
 248    FREE(drmsurf);
 249 }
 250
 251 static struct drm_surface *
 252 drm_display_create_surface(struct native_display *ndpy,
 253                            const struct native_config *nconf,
 254                            uint width, uint height)
 255 {
 256    struct drm_display *drmdpy = drm_display(ndpy);
 257    struct drm_config *drmconf = drm_config(nconf);
 258    struct drm_surface *drmsurf;
 259
 260    drmsurf = CALLOC_STRUCT(drm_surface);
 261    if (!drmsurf)
 262       return NULL;
 263
 264    drmsurf->drmdpy = drmdpy;
 265    drmsurf->color_format = drmconf->base.color_format;
 266    drmsurf->width = width;
 267    drmsurf->height = height;
 268    drmsurf->have_pageflip = TRUE;
 269
 270    drmsurf->rsurf = resource_surface_create(drmdpy->base.screen,
 271          drmsurf->color_format,
 272          PIPE_BIND_RENDER_TARGET |
 273          PIPE_BIND_SAMPLER_VIEW |
 274          PIPE_BIND_DISPLAY_TARGET |
 275          PIPE_BIND_SCANOUT);
 276    if (!drmsurf->rsurf) {
 277       FREE(drmsurf);
 278       return NULL;
 279    }
 280
 281    resource_surface_set_size(drmsurf->rsurf, drmsurf->width, drmsurf->height);
 282
 283    drmsurf->base.destroy = drm_surface_destroy;
 284    drmsurf->base.present = drm_surface_present;
 285    drmsurf->base.validate = drm_surface_validate;
 286    drmsurf->base.wait = drm_surface_wait;
 287
 288    return drmsurf;
 289 }
 290
 291 struct native_surface *
 292 drm_display_create_surface_from_resource(struct native_display *ndpy,
 293                                          struct pipe_resource *resource)
 294 {
 295    struct drm_display *drmdpy = drm_display(ndpy);
 296    struct drm_surface *drmsurf;
 297    enum native_attachment natt = NATIVE_ATTACHMENT_FRONT_LEFT;
 298
 299    drmsurf = CALLOC_STRUCT(drm_surface);
 300    if (!drmsurf)
 301       return NULL;
 302
 303    drmsurf->drmdpy = drmdpy;
 304    drmsurf->color_format = resource->format;
 305    drmsurf->width = resource->width0;
 306    drmsurf->height = resource->height0;
 307    drmsurf->have_pageflip = FALSE;
 308
 309    drmsurf->rsurf = resource_surface_create(drmdpy->base.screen,
 310          drmsurf->color_format,
 311          PIPE_BIND_RENDER_TARGET |
 312          PIPE_BIND_SAMPLER_VIEW |
 313          PIPE_BIND_DISPLAY_TARGET |
 314          PIPE_BIND_SCANOUT);
 315
 316    resource_surface_import_resource(drmsurf->rsurf, natt, resource);
 317
 318    drmsurf->base.destroy = drm_surface_destroy;
 319    drmsurf->base.present = drm_surface_present;
 320    drmsurf->base.validate = drm_surface_validate;
 321    drmsurf->base.wait = drm_surface_wait;
 322
 323    return &drmsurf->base;
 324 }
 325
 326
 327 /**
 328  * Choose a CRTC that supports all given connectors.
 329  */
 330 static uint32_t
 331 drm_display_choose_crtc(struct native_display *ndpy,
 332                         uint32_t *connectors, int num_connectors)
 333 {
 334    struct drm_display *drmdpy = drm_display(ndpy);
 335    int idx;
 336
 337    for (idx = 0; idx < drmdpy->resources->count_crtcs; idx++) {
 338       boolean found_crtc = TRUE;
 339       int i, j;
 340
 341       for (i = 0; i < num_connectors; i++) {
 342          drmModeConnectorPtr connector;
 343          int encoder_idx = -1;
 344
 345          connector = drmModeGetConnector(drmdpy->fd, connectors[i]);
 346          if (!connector) {
 347             found_crtc = FALSE;
 348             break;
 349          }
 350
 351          /* find an encoder the CRTC supports */
 352          for (j = 0; j < connector->count_encoders; j++) {
 353             drmModeEncoderPtr encoder =
 354                drmModeGetEncoder(drmdpy->fd, connector->encoders[j]);
 355             if (encoder->possible_crtcs & (1 << idx)) {
 356                encoder_idx = j;
 357                break;
 358             }
 359             drmModeFreeEncoder(encoder);
 360          }
 361
 362          drmModeFreeConnector(connector);
 363          if (encoder_idx < 0) {
 364             found_crtc = FALSE;
 365             break;
 366          }
 367       }
 368
 369       if (found_crtc)
 370          break;
 371    }
 372
 373    if (idx >= drmdpy->resources->count_crtcs) {
 374       _eglLog(_EGL_WARNING,
 375             "failed to find a CRTC that supports the given %d connectors",
 376             num_connectors);
 377       return 0;
 378    }
 379
 380    return drmdpy->resources->crtcs[idx];
 381 }
 382
 383 /**
 384  * Remember the original CRTC status and set the CRTC
 385  */
 386 static boolean
 387 drm_display_set_crtc(struct native_display *ndpy, int crtc_idx,
 388                      uint32_t buffer_id, uint32_t x, uint32_t y,
 389                      uint32_t *connectors, int num_connectors,
 390                      drmModeModeInfoPtr mode)
 391 {
 392    struct drm_display *drmdpy = drm_display(ndpy);
 393    struct drm_crtc *drmcrtc = &drmdpy->saved_crtcs[crtc_idx];
 394    uint32_t crtc_id;
 395    int err;
 396
 397    if (drmcrtc->crtc) {
 398       crtc_id = drmcrtc->crtc->crtc_id;
 399    }
 400    else {
 401       int count = 0, i;
 402
 403       /*
 404        * Choose the CRTC once.  It could be more dynamic, but let's keep it
 405        * simple for now.
 406        */
 407       crtc_id = drm_display_choose_crtc(&drmdpy->base,
 408             connectors, num_connectors);
 409
 410       /* save the original CRTC status */
 411       drmcrtc->crtc = drmModeGetCrtc(drmdpy->fd, crtc_id);
 412       if (!drmcrtc->crtc)
 413          return FALSE;
 414
 415       for (i = 0; i < drmdpy->num_connectors; i++) {
 416          struct drm_connector *drmconn = &drmdpy->connectors[i];
 417          drmModeConnectorPtr connector = drmconn->connector;
 418          drmModeEncoderPtr encoder;
 419
 420          encoder = drmModeGetEncoder(drmdpy->fd, connector->encoder_id);
 421          if (encoder) {
 422             if (encoder->crtc_id == crtc_id) {
 423                drmcrtc->connectors[count++] = connector->connector_id;
 424                if (count >= Elements(drmcrtc->connectors))
 425                   break;
 426             }
 427             drmModeFreeEncoder(encoder);
 428          }
 429       }
 430
 431       drmcrtc->num_connectors = count;
 432    }
 433
 434    err = drmModeSetCrtc(drmdpy->fd, crtc_id, buffer_id, x, y,
 435          connectors, num_connectors, mode);
 436    if (err) {
 437       drmModeFreeCrtc(drmcrtc->crtc);
 438       drmcrtc->crtc = NULL;
 439       drmcrtc->num_connectors = 0;
 440
 441       return FALSE;
 442    }
 443
 444    return TRUE;
 445 }
 446
 447 static boolean
 448 drm_display_program(struct native_display *ndpy, int crtc_idx,
 449                     struct native_surface *nsurf, uint x, uint y,
 450                     const struct native_connector **nconns, int num_nconns,
 451                     const struct native_mode *nmode)
 452 {
 453    struct drm_display *drmdpy = drm_display(ndpy);
 454    struct drm_surface *drmsurf = drm_surface(nsurf);
 455    const struct drm_mode *drmmode = drm_mode(nmode);
 456    uint32_t connector_ids[32];
 457    uint32_t buffer_id;
 458    drmModeModeInfo mode_tmp, *mode;
 459    int i;
 460
 461    if (num_nconns > Elements(connector_ids)) {
 462       _eglLog(_EGL_WARNING, "too many connectors (%d)", num_nconns);
 463       num_nconns = Elements(connector_ids);
 464    }
 465
 466    if (drmsurf) {
 467       if (!drm_surface_init_framebuffers(&drmsurf->base, FALSE))
 468          return FALSE;
 469
 470       buffer_id = drmsurf->front_fb.buffer_id;
 471       /* the mode argument of drmModeSetCrtc is not constified */
 472       mode_tmp = drmmode->mode;
 473       mode = &mode_tmp;
 474    }
 475    else {
 476       /* disable the CRTC */
 477       buffer_id = 0;
 478       mode = NULL;
 479       num_nconns = 0;
 480    }
 481
 482    for (i = 0; i < num_nconns; i++) {
 483       struct drm_connector *drmconn = drm_connector(nconns[i]);
 484       connector_ids[i] = drmconn->connector->connector_id;
 485    }
 486
 487    if (!drm_display_set_crtc(&drmdpy->base, crtc_idx, buffer_id, x, y,
 488             connector_ids, num_nconns, mode)) {
 489       _eglLog(_EGL_WARNING, "failed to set CRTC %d", crtc_idx);
 490
 491       return FALSE;
 492    }
 493
 494    if (drmdpy->shown_surfaces[crtc_idx])
 495       drmdpy->shown_surfaces[crtc_idx]->is_shown = FALSE;
 496    drmdpy->shown_surfaces[crtc_idx] = drmsurf;
 497
 498    /* remember the settings for buffer swapping */
 499    if (drmsurf) {
 500       uint32_t crtc_id = drmdpy->saved_crtcs[crtc_idx].crtc->crtc_id;
 501       struct drm_crtc *drmcrtc = &drmsurf->current_crtc;
 502
 503       if (drmcrtc->crtc)
 504          drmModeFreeCrtc(drmcrtc->crtc);
 505       drmcrtc->crtc = drmModeGetCrtc(drmdpy->fd, crtc_id);
 506
 507       assert(num_nconns < Elements(drmcrtc->connectors));
 508       memcpy(drmcrtc->connectors, connector_ids,
 509             sizeof(*connector_ids) * num_nconns);
 510       drmcrtc->num_connectors = num_nconns;
 511
 512       drmsurf->is_shown = TRUE;
 513    }
 514
 515    return TRUE;
 516 }
 517
 518 static const struct native_mode **
 519 drm_display_get_modes(struct native_display *ndpy,
 520                       const struct native_connector *nconn,
 521                       int *num_modes)
 522 {
 523    struct drm_display *drmdpy = drm_display(ndpy);
 524    struct drm_connector *drmconn = drm_connector(nconn);
 525    const struct native_mode **nmodes_return;
 526    int count, i;
 527
 528    /* delete old data */
 529    if (drmconn->connector) {
 530       drmModeFreeConnector(drmconn->connector);
 531       FREE(drmconn->drm_modes);
 532
 533       drmconn->connector = NULL;
 534       drmconn->drm_modes = NULL;
 535       drmconn->num_modes = 0;
 536    }
 537
 538    /* detect again */
 539    drmconn->connector = drmModeGetConnector(drmdpy->fd, drmconn->connector_id);
 540    if (!drmconn->connector)
 541       return NULL;
 542
 543    count = drmconn->connector->count_modes;
 544    drmconn->drm_modes = CALLOC(count, sizeof(*drmconn->drm_modes));
 545    if (!drmconn->drm_modes) {
 546       drmModeFreeConnector(drmconn->connector);
 547       drmconn->connector = NULL;
 548
 549       return NULL;
 550    }
 551
 552    for (i = 0; i < count; i++) {
 553       struct drm_mode *drmmode = &drmconn->drm_modes[i];
 554       drmModeModeInfoPtr mode = &drmconn->connector->modes[i];
 555
 556       drmmode->mode = *mode;
 557
 558       drmmode->base.desc = drmmode->mode.name;
 559       drmmode->base.width = drmmode->mode.hdisplay;
 560       drmmode->base.height = drmmode->mode.vdisplay;
 561       drmmode->base.refresh_rate = drmmode->mode.vrefresh;
 562       /* not all kernels have vrefresh = refresh_rate * 1000 */
 563       if (drmmode->base.refresh_rate < 1000)
 564          drmmode->base.refresh_rate *= 1000;
 565    }
 566
 567    nmodes_return = MALLOC(count * sizeof(*nmodes_return));
 568    if (nmodes_return) {
 569       for (i = 0; i < count; i++)
 570          nmodes_return[i] = &drmconn->drm_modes[i].base;
 571       if (num_modes)
 572          *num_modes = count;
 573    }
 574
 575    return nmodes_return;
 576 }
 577
 578 static const struct native_connector **
 579 drm_display_get_connectors(struct native_display *ndpy, int *num_connectors,
 580                            int *num_crtc)
 581 {
 582    struct drm_display *drmdpy = drm_display(ndpy);
 583    const struct native_connector **connectors;
 584    int i;
 585
 586    if (!drmdpy->connectors) {
 587       drmdpy->connectors =
 588          CALLOC(drmdpy->resources->count_connectors, sizeof(*drmdpy->connectors));
 589       if (!drmdpy->connectors)
 590          return NULL;
 591
 592       for (i = 0; i < drmdpy->resources->count_connectors; i++) {
 593          struct drm_connector *drmconn = &drmdpy->connectors[i];
 594
 595          drmconn->connector_id = drmdpy->resources->connectors[i];
 596          /* drmconn->connector is allocated when the modes are asked */
 597       }
 598
 599       drmdpy->num_connectors = drmdpy->resources->count_connectors;
 600    }
 601
 602    connectors = MALLOC(drmdpy->num_connectors * sizeof(*connectors));
 603    if (connectors) {
 604       for (i = 0; i < drmdpy->num_connectors; i++)
 605          connectors[i] = &drmdpy->connectors[i].base;
 606       if (num_connectors)
 607          *num_connectors = drmdpy->num_connectors;
 608    }
 609
 610    if (num_crtc)
 611       *num_crtc = drmdpy->resources->count_crtcs;
 612
 613    return connectors;
 614 }
 615
 616 static struct native_surface *
 617 drm_display_create_scanout_surface(struct native_display *ndpy,
 618                                    const struct native_config *nconf,
 619                                    uint width, uint height)
 620 {
 621    struct drm_surface *drmsurf;
 622
 623    drmsurf = drm_display_create_surface(ndpy, nconf, width, height);
 624    return &drmsurf->base;
 625 }
 626
 627 static struct native_display_modeset drm_display_modeset = {
 628    .get_connectors = drm_display_get_connectors,
 629    .get_modes = drm_display_get_modes,
 630    .create_scanout_surface = drm_display_create_scanout_surface,
 631    .program = drm_display_program
 632 };
 633
 634 void
 635 drm_display_fini_modeset(struct native_display *ndpy)
 636 {
 637    struct drm_display *drmdpy = drm_display(ndpy);
 638    int i;
 639
 640    if (drmdpy->connectors) {
 641       for (i = 0; i < drmdpy->num_connectors; i++) {
 642          struct drm_connector *drmconn = &drmdpy->connectors[i];
 643          if (drmconn->connector) {
 644             drmModeFreeConnector(drmconn->connector);
 645             FREE(drmconn->drm_modes);
 646          }
 647       }
 648       FREE(drmdpy->connectors);
 649    }
 650
 651    FREE(drmdpy->shown_surfaces);
 652    drmdpy->shown_surfaces = NULL;
 653
 654    if (drmdpy->saved_crtcs) {
 655       for (i = 0; i < drmdpy->resources->count_crtcs; i++) {
 656          struct drm_crtc *drmcrtc = &drmdpy->saved_crtcs[i];
 657
 658          if (drmcrtc->crtc) {
 659             /* restore crtc */
 660             drmModeSetCrtc(drmdpy->fd, drmcrtc->crtc->crtc_id,
 661                   drmcrtc->crtc->buffer_id, drmcrtc->crtc->x, drmcrtc->crtc->y,
 662                   drmcrtc->connectors, drmcrtc->num_connectors,
 663                   &drmcrtc->crtc->mode);
 664
 665             drmModeFreeCrtc(drmcrtc->crtc);
 666          }
 667       }
 668       FREE(drmdpy->saved_crtcs);
 669    }
 670
 671    if (drmdpy->resources) {
 672       drmModeFreeResources(drmdpy->resources);
 673       drmdpy->resources = NULL;
 674    }
 675
 676    drmdpy->base.modeset = NULL;
 677 }
 678
 679 boolean
 680 drm_display_init_modeset(struct native_display *ndpy)
 681 {
 682    struct drm_display *drmdpy = drm_display(ndpy);
 683
 684    /* resources are fixed, unlike crtc, connector, or encoder */
 685    drmdpy->resources = drmModeGetResources(drmdpy->fd);
 686    if (!drmdpy->resources) {
 687       _eglLog(_EGL_DEBUG, "Failed to get KMS resources.  Disable modeset.");
 688       return FALSE;
 689    }
 690
 691    drmdpy->saved_crtcs =
 692       CALLOC(drmdpy->resources->count_crtcs, sizeof(*drmdpy->saved_crtcs));
 693    if (!drmdpy->saved_crtcs) {
 694       drm_display_fini_modeset(&drmdpy->base);
 695       return FALSE;
 696    }
 697
 698    drmdpy->shown_surfaces =
 699       CALLOC(drmdpy->resources->count_crtcs, sizeof(*drmdpy->shown_surfaces));
 700    if (!drmdpy->shown_surfaces) {
 701       drm_display_fini_modeset(&drmdpy->base);
 702       return FALSE;
 703    }
 704
 705    drmdpy->base.modeset = &drm_display_modeset;
 706
 707    return TRUE;
 708 }