drivers/gpu/drm/omapdrm/omap_drv.c

   1 /*
   2  * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
   3  * Author: Rob Clark <rob@ti.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <linux/sys_soc.h>
  19
  20 #include <drm/drm_atomic.h>
  21 #include <drm/drm_atomic_helper.h>
  22 #include <drm/drm_crtc_helper.h>
  23 #include <drm/drm_fb_helper.h>
  24
  25 #include "omap_dmm_tiler.h"
  26 #include "omap_drv.h"
  27
  28 #define DRIVER_NAME             MODULE_NAME
  29 #define DRIVER_DESC             "OMAP DRM"
  30 #define DRIVER_DATE             "20110917"
  31 #define DRIVER_MAJOR            1
  32 #define DRIVER_MINOR            0
  33 #define DRIVER_PATCHLEVEL       0
  34
  35 /*
  36  * mode config funcs
  37  */
  38
  39 /* Notes about mapping DSS and DRM entities:
  40  *    CRTC:        overlay
  41  *    encoder:     manager.. with some extension to allow one primary CRTC
  42  *                 and zero or more video CRTC's to be mapped to one encoder?
  43  *    connector:   dssdev.. manager can be attached/detached from different
  44  *                 devices
  45  */
  46
  47 static void omap_atomic_wait_for_completion(struct drm_device *dev,
  48                                             struct drm_atomic_state *old_state)
  49 {
  50         struct drm_crtc_state *new_crtc_state;
  51         struct drm_crtc *crtc;
  52         unsigned int i;
  53         int ret;
  54
  55         for_each_new_crtc_in_state(old_state, crtc, new_crtc_state, i) {
  56                 if (!new_crtc_state->active)
  57                         continue;
  58
  59                 ret = omap_crtc_wait_pending(crtc);
  60
  61                 if (!ret)
  62                         dev_warn(dev->dev,
  63                                  "atomic complete timeout (pipe %u)!\n", i);
  64         }
  65 }
  66
  67 static void omap_atomic_commit_tail(struct drm_atomic_state *old_state)
  68 {
  69         struct drm_device *dev = old_state->dev;
  70         struct omap_drm_private *priv = dev->dev_private;
  71
  72         priv->dispc_ops->runtime_get(priv->dispc);
  73
  74         /* Apply the atomic update. */
  75         drm_atomic_helper_commit_modeset_disables(dev, old_state);
  76
  77         if (priv->omaprev != 0x3430) {
  78                 /* With the current dss dispc implementation we have to enable
  79                  * the new modeset before we can commit planes. The dispc ovl
  80                  * configuration relies on the video mode configuration been
  81                  * written into the HW when the ovl configuration is
  82                  * calculated.
  83                  *
  84                  * This approach is not ideal because after a mode change the
  85                  * plane update is executed only after the first vblank
  86                  * interrupt. The dispc implementation should be fixed so that
  87                  * it is able use uncommitted drm state information.
  88                  */
  89                 drm_atomic_helper_commit_modeset_enables(dev, old_state);
  90                 omap_atomic_wait_for_completion(dev, old_state);
  91
  92                 drm_atomic_helper_commit_planes(dev, old_state, 0);
  93
  94                 drm_atomic_helper_commit_hw_done(old_state);
  95         } else {
  96                 /*
  97                  * OMAP3 DSS seems to have issues with the work-around above,
  98                  * resulting in endless sync losts if a crtc is enabled without
  99                  * a plane. For now, skip the WA for OMAP3.
 100                  */
 101                 drm_atomic_helper_commit_planes(dev, old_state, 0);
 102
 103                 drm_atomic_helper_commit_modeset_enables(dev, old_state);
 104
 105                 drm_atomic_helper_commit_hw_done(old_state);
 106         }
 107
 108         /*
 109          * Wait for completion of the page flips to ensure that old buffers
 110          * can't be touched by the hardware anymore before cleaning up planes.
 111          */
 112         omap_atomic_wait_for_completion(dev, old_state);
 113
 114         drm_atomic_helper_cleanup_planes(dev, old_state);
 115
 116         priv->dispc_ops->runtime_put(priv->dispc);
 117 }
 118
 119 static const struct drm_mode_config_helper_funcs omap_mode_config_helper_funcs = {
 120         .atomic_commit_tail = omap_atomic_commit_tail,
 121 };
 122
 123 static const struct drm_mode_config_funcs omap_mode_config_funcs = {
 124         .fb_create = omap_framebuffer_create,
 125         .output_poll_changed = drm_fb_helper_output_poll_changed,
 126         .atomic_check = drm_atomic_helper_check,
 127         .atomic_commit = drm_atomic_helper_commit,
 128 };
 129
 130 static int get_connector_type(struct omap_dss_device *dssdev)
 131 {
 132         switch (dssdev->type) {
 133         case OMAP_DISPLAY_TYPE_HDMI:
 134                 return DRM_MODE_CONNECTOR_HDMIA;
 135         case OMAP_DISPLAY_TYPE_DVI:
 136                 return DRM_MODE_CONNECTOR_DVID;
 137         case OMAP_DISPLAY_TYPE_DSI:
 138                 return DRM_MODE_CONNECTOR_DSI;
 139         case OMAP_DISPLAY_TYPE_DPI:
 140         case OMAP_DISPLAY_TYPE_DBI:
 141                 return DRM_MODE_CONNECTOR_DPI;
 142         case OMAP_DISPLAY_TYPE_VENC:
 143                 /* TODO: This could also be composite */
 144                 return DRM_MODE_CONNECTOR_SVIDEO;
 145         case OMAP_DISPLAY_TYPE_SDI:
 146                 return DRM_MODE_CONNECTOR_LVDS;
 147         default:
 148                 return DRM_MODE_CONNECTOR_Unknown;
 149         }
 150 }
 151
 152 static void omap_disconnect_dssdevs(void)
 153 {
 154         struct omap_dss_device *dssdev = NULL;
 155
 156         for_each_dss_dev(dssdev)
 157                 dssdev->driver->disconnect(dssdev);
 158 }
 159
 160 static int omap_connect_dssdevs(void)
 161 {
 162         int r;
 163         struct omap_dss_device *dssdev = NULL;
 164
 165         if (!omapdss_stack_is_ready())
 166                 return -EPROBE_DEFER;
 167
 168         for_each_dss_dev(dssdev) {
 169                 r = dssdev->driver->connect(dssdev);
 170                 if (r == -EPROBE_DEFER) {
 171                         omap_dss_put_device(dssdev);
 172                         goto cleanup;
 173                 } else if (r) {
 174                         dev_warn(dssdev->dev, "could not connect display: %s\n",
 175                                 dssdev->name);
 176                 }
 177         }
 178
 179         return 0;
 180
 181 cleanup:
 182         /*
 183          * if we are deferring probe, we disconnect the devices we previously
 184          * connected
 185          */
 186         omap_disconnect_dssdevs();
 187
 188         return r;
 189 }
 190
 191 static int omap_modeset_init_properties(struct drm_device *dev)
 192 {
 193         struct omap_drm_private *priv = dev->dev_private;
 194         unsigned int num_planes = priv->dispc_ops->get_num_ovls(priv->dispc);
 195
 196         priv->zorder_prop = drm_property_create_range(dev, 0, "zorder", 0,
 197                                                       num_planes - 1);
 198         if (!priv->zorder_prop)
 199                 return -ENOMEM;
 200
 201         return 0;
 202 }
 203
 204 static int omap_modeset_init(struct drm_device *dev)
 205 {
 206         struct omap_drm_private *priv = dev->dev_private;
 207         struct omap_dss_device *dssdev = NULL;
 208         int num_ovls = priv->dispc_ops->get_num_ovls(priv->dispc);
 209         int num_mgrs = priv->dispc_ops->get_num_mgrs(priv->dispc);
 210         int num_crtcs, crtc_idx, plane_idx;
 211         int ret;
 212         u32 plane_crtc_mask;
 213
 214         drm_mode_config_init(dev);
 215
 216         ret = omap_modeset_init_properties(dev);
 217         if (ret < 0)
 218                 return ret;
 219
 220         /*
 221          * This function creates exactly one connector, encoder, crtc,
 222          * and primary plane per each connected dss-device. Each
 223          * connector->encoder->crtc chain is expected to be separate
 224          * and each crtc is connect to a single dss-channel. If the
 225          * configuration does not match the expectations or exceeds
 226          * the available resources, the configuration is rejected.
 227          */
 228         num_crtcs = 0;
 229         for_each_dss_dev(dssdev)
 230                 if (omapdss_device_is_connected(dssdev))
 231                         num_crtcs++;
 232
 233         if (num_crtcs > num_mgrs || num_crtcs > num_ovls ||
 234             num_crtcs > ARRAY_SIZE(priv->crtcs) ||
 235             num_crtcs > ARRAY_SIZE(priv->planes) ||
 236             num_crtcs > ARRAY_SIZE(priv->encoders) ||
 237             num_crtcs > ARRAY_SIZE(priv->connectors)) {
 238                 dev_err(dev->dev, "%s(): Too many connected displays\n",
 239                         __func__);
 240                 return -EINVAL;
 241         }
 242
 243         /* All planes can be put to any CRTC */
 244         plane_crtc_mask = (1 << num_crtcs) - 1;
 245
 246         dssdev = NULL;
 247
 248         crtc_idx = 0;
 249         plane_idx = 0;
 250         for_each_dss_dev(dssdev) {
 251                 struct drm_connector *connector;
 252                 struct drm_encoder *encoder;
 253                 struct drm_plane *plane;
 254                 struct drm_crtc *crtc;
 255
 256                 if (!omapdss_device_is_connected(dssdev))
 257                         continue;
 258
 259                 encoder = omap_encoder_init(dev, dssdev);
 260                 if (!encoder)
 261                         return -ENOMEM;
 262
 263                 connector = omap_connector_init(dev,
 264                                 get_connector_type(dssdev), dssdev, encoder);
 265                 if (!connector)
 266                         return -ENOMEM;
 267
 268                 plane = omap_plane_init(dev, plane_idx, DRM_PLANE_TYPE_PRIMARY,
 269                                         plane_crtc_mask);
 270                 if (IS_ERR(plane))
 271                         return PTR_ERR(plane);
 272
 273                 crtc = omap_crtc_init(dev, plane, dssdev);
 274                 if (IS_ERR(crtc))
 275                         return PTR_ERR(crtc);
 276
 277                 drm_connector_attach_encoder(connector, encoder);
 278                 encoder->possible_crtcs = (1 << crtc_idx);
 279
 280                 priv->crtcs[priv->num_crtcs++] = crtc;
 281                 priv->planes[priv->num_planes++] = plane;
 282                 priv->encoders[priv->num_encoders++] = encoder;
 283                 priv->connectors[priv->num_connectors++] = connector;
 284
 285                 plane_idx++;
 286                 crtc_idx++;
 287         }
 288
 289         /*
 290          * Create normal planes for the remaining overlays:
 291          */
 292         for (; plane_idx < num_ovls; plane_idx++) {
 293                 struct drm_plane *plane;
 294
 295                 if (WARN_ON(priv->num_planes >= ARRAY_SIZE(priv->planes)))
 296                         return -EINVAL;
 297
 298                 plane = omap_plane_init(dev, plane_idx, DRM_PLANE_TYPE_OVERLAY,
 299                         plane_crtc_mask);
 300                 if (IS_ERR(plane))
 301                         return PTR_ERR(plane);
 302
 303                 priv->planes[priv->num_planes++] = plane;
 304         }
 305
 306         DBG("registered %d planes, %d crtcs, %d encoders and %d connectors\n",
 307                 priv->num_planes, priv->num_crtcs, priv->num_encoders,
 308                 priv->num_connectors);
 309
 310         dev->mode_config.min_width = 8;
 311         dev->mode_config.min_height = 2;
 312
 313         /*
 314          * Note: these values are used for multiple independent things:
 315          * connector mode filtering, buffer sizes, crtc sizes...
 316          * Use big enough values here to cover all use cases, and do more
 317          * specific checking in the respective code paths.
 318          */
 319         dev->mode_config.max_width = 8192;
 320         dev->mode_config.max_height = 8192;
 321
 322         /* We want the zpos to be normalized */
 323         dev->mode_config.normalize_zpos = true;
 324
 325         dev->mode_config.funcs = &omap_mode_config_funcs;
 326         dev->mode_config.helper_private = &omap_mode_config_helper_funcs;
 327
 328         drm_mode_config_reset(dev);
 329
 330         omap_drm_irq_install(dev);
 331
 332         return 0;
 333 }
 334
 335 /*
 336  * Enable the HPD in external components if supported
 337  */
 338 static void omap_modeset_enable_external_hpd(void)
 339 {
 340         struct omap_dss_device *dssdev = NULL;
 341
 342         for_each_dss_dev(dssdev) {
 343                 if (dssdev->driver->enable_hpd)
 344                         dssdev->driver->enable_hpd(dssdev);
 345         }
 346 }
 347
 348 /*
 349  * Disable the HPD in external components if supported
 350  */
 351 static void omap_modeset_disable_external_hpd(void)
 352 {
 353         struct omap_dss_device *dssdev = NULL;
 354
 355         for_each_dss_dev(dssdev) {
 356                 if (dssdev->driver->disable_hpd)
 357                         dssdev->driver->disable_hpd(dssdev);
 358         }
 359 }
 360
 361 /*
 362  * drm ioctl funcs
 363  */
 364
 365
 366 static int ioctl_get_param(struct drm_device *dev, void *data,
 367                 struct drm_file *file_priv)
 368 {
 369         struct omap_drm_private *priv = dev->dev_private;
 370         struct drm_omap_param *args = data;
 371
 372         DBG("%p: param=%llu", dev, args->param);
 373
 374         switch (args->param) {
 375         case OMAP_PARAM_CHIPSET_ID:
 376                 args->value = priv->omaprev;
 377                 break;
 378         default:
 379                 DBG("unknown parameter %lld", args->param);
 380                 return -EINVAL;
 381         }
 382
 383         return 0;
 384 }
 385
 386 static int ioctl_set_param(struct drm_device *dev, void *data,
 387                 struct drm_file *file_priv)
 388 {
 389         struct drm_omap_param *args = data;
 390
 391         switch (args->param) {
 392         default:
 393                 DBG("unknown parameter %lld", args->param);
 394                 return -EINVAL;
 395         }
 396
 397         return 0;
 398 }
 399
 400 #define OMAP_BO_USER_MASK       0x00ffffff      /* flags settable by userspace */
 401
 402 static int ioctl_gem_new(struct drm_device *dev, void *data,
 403                 struct drm_file *file_priv)
 404 {
 405         struct drm_omap_gem_new *args = data;
 406         u32 flags = args->flags & OMAP_BO_USER_MASK;
 407
 408         VERB("%p:%p: size=0x%08x, flags=%08x", dev, file_priv,
 409              args->size.bytes, flags);
 410
 411         return omap_gem_new_handle(dev, file_priv, args->size, flags,
 412                                    &args->handle);
 413 }
 414
 415 static int ioctl_gem_info(struct drm_device *dev, void *data,
 416                 struct drm_file *file_priv)
 417 {
 418         struct drm_omap_gem_info *args = data;
 419         struct drm_gem_object *obj;
 420         int ret = 0;
 421
 422         VERB("%p:%p: handle=%d", dev, file_priv, args->handle);
 423
 424         obj = drm_gem_object_lookup(file_priv, args->handle);
 425         if (!obj)
 426                 return -ENOENT;
 427
 428         args->size = omap_gem_mmap_size(obj);
 429         args->offset = omap_gem_mmap_offset(obj);
 430
 431         drm_gem_object_unreference_unlocked(obj);
 432
 433         return ret;
 434 }
 435
 436 static const struct drm_ioctl_desc ioctls[DRM_COMMAND_END - DRM_COMMAND_BASE] = {
 437         DRM_IOCTL_DEF_DRV(OMAP_GET_PARAM, ioctl_get_param,
 438                           DRM_AUTH | DRM_RENDER_ALLOW),
 439         DRM_IOCTL_DEF_DRV(OMAP_SET_PARAM, ioctl_set_param,
 440                           DRM_AUTH | DRM_MASTER | DRM_ROOT_ONLY),
 441         DRM_IOCTL_DEF_DRV(OMAP_GEM_NEW, ioctl_gem_new,
 442                           DRM_AUTH | DRM_RENDER_ALLOW),
 443         /* Deprecated, to be removed. */
 444         DRM_IOCTL_DEF_DRV(OMAP_GEM_CPU_PREP, drm_noop,
 445                           DRM_AUTH | DRM_RENDER_ALLOW),
 446         /* Deprecated, to be removed. */
 447         DRM_IOCTL_DEF_DRV(OMAP_GEM_CPU_FINI, drm_noop,
 448                           DRM_AUTH | DRM_RENDER_ALLOW),
 449         DRM_IOCTL_DEF_DRV(OMAP_GEM_INFO, ioctl_gem_info,
 450                           DRM_AUTH | DRM_RENDER_ALLOW),
 451 };
 452
 453 /*
 454  * drm driver funcs
 455  */
 456
 457 static int dev_open(struct drm_device *dev, struct drm_file *file)
 458 {
 459         file->driver_priv = NULL;
 460
 461         DBG("open: dev=%p, file=%p", dev, file);
 462
 463         return 0;
 464 }
 465
 466 static const struct vm_operations_struct omap_gem_vm_ops = {
 467         .fault = omap_gem_fault,
 468         .open = drm_gem_vm_open,
 469         .close = drm_gem_vm_close,
 470 };
 471
 472 static const struct file_operations omapdriver_fops = {
 473         .owner = THIS_MODULE,
 474         .open = drm_open,
 475         .unlocked_ioctl = drm_ioctl,
 476         .compat_ioctl = drm_compat_ioctl,
 477         .release = drm_release,
 478         .mmap = omap_gem_mmap,
 479         .poll = drm_poll,
 480         .read = drm_read,
 481         .llseek = noop_llseek,
 482 };
 483
 484 static struct drm_driver omap_drm_driver = {
 485         .driver_features = DRIVER_MODESET | DRIVER_GEM  | DRIVER_PRIME |
 486                 DRIVER_ATOMIC | DRIVER_RENDER,
 487         .open = dev_open,
 488         .lastclose = drm_fb_helper_lastclose,
 489 #ifdef CONFIG_DEBUG_FS
 490         .debugfs_init = omap_debugfs_init,
 491 #endif
 492         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 493         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 494         .gem_prime_export = omap_gem_prime_export,
 495         .gem_prime_import = omap_gem_prime_import,
 496         .gem_free_object_unlocked = omap_gem_free_object,
 497         .gem_vm_ops = &omap_gem_vm_ops,
 498         .dumb_create = omap_gem_dumb_create,
 499         .dumb_map_offset = omap_gem_dumb_map_offset,
 500         .ioctls = ioctls,
 501         .num_ioctls = DRM_OMAP_NUM_IOCTLS,
 502         .fops = &omapdriver_fops,
 503         .name = DRIVER_NAME,
 504         .desc = DRIVER_DESC,
 505         .date = DRIVER_DATE,
 506         .major = DRIVER_MAJOR,
 507         .minor = DRIVER_MINOR,
 508         .patchlevel = DRIVER_PATCHLEVEL,
 509 };
 510
 511 static const struct soc_device_attribute omapdrm_soc_devices[] = {
 512         { .family = "OMAP3", .data = (void *)0x3430 },
 513         { .family = "OMAP4", .data = (void *)0x4430 },
 514         { .family = "OMAP5", .data = (void *)0x5430 },
 515         { .family = "DRA7",  .data = (void *)0x0752 },
 516         { /* sentinel */ }
 517 };
 518
 519 static int omapdrm_init(struct omap_drm_private *priv, struct device *dev)
 520 {
 521         const struct soc_device_attribute *soc;
 522         struct drm_device *ddev;
 523         unsigned int i;
 524         int ret;
 525
 526         DBG("%s", dev_name(dev));
 527
 528         priv->dev = dev;
 529         priv->dss = omapdss_get_dss();
 530         priv->dispc = dispc_get_dispc(priv->dss);
 531         priv->dispc_ops = dispc_get_ops(priv->dss);
 532
 533         omap_crtc_pre_init(priv);
 534
 535         ret = omap_connect_dssdevs();
 536         if (ret)
 537                 goto err_crtc_uninit;
 538
 539         soc = soc_device_match(omapdrm_soc_devices);
 540         priv->omaprev = soc ? (unsigned int)soc->data : 0;
 541         priv->wq = alloc_ordered_workqueue("omapdrm", 0);
 542
 543         mutex_init(&priv->list_lock);
 544         INIT_LIST_HEAD(&priv->obj_list);
 545
 546         /* Allocate and initialize the DRM device. */
 547         ddev = drm_dev_alloc(&omap_drm_driver, priv->dev);
 548         if (IS_ERR(ddev)) {
 549                 ret = PTR_ERR(ddev);
 550                 goto err_destroy_wq;
 551         }
 552
 553         priv->ddev = ddev;
 554         ddev->dev_private = priv;
 555
 556         /* Get memory bandwidth limits */
 557         if (priv->dispc_ops->get_memory_bandwidth_limit)
 558                 priv->max_bandwidth =
 559                         priv->dispc_ops->get_memory_bandwidth_limit(priv->dispc);
 560
 561         omap_gem_init(ddev);
 562
 563         ret = omap_modeset_init(ddev);
 564         if (ret) {
 565                 dev_err(priv->dev, "omap_modeset_init failed: ret=%d\n", ret);
 566                 goto err_free_drm_dev;
 567         }
 568
 569         /* Initialize vblank handling, start with all CRTCs disabled. */
 570         ret = drm_vblank_init(ddev, priv->num_crtcs);
 571         if (ret) {
 572                 dev_err(priv->dev, "could not init vblank\n");
 573                 goto err_cleanup_modeset;
 574         }
 575
 576         for (i = 0; i < priv->num_crtcs; i++)
 577                 drm_crtc_vblank_off(priv->crtcs[i]);
 578
 579         omap_fbdev_init(ddev);
 580
 581         drm_kms_helper_poll_init(ddev);
 582         omap_modeset_enable_external_hpd();
 583
 584         /*
 585          * Register the DRM device with the core and the connectors with
 586          * sysfs.
 587          */
 588         ret = drm_dev_register(ddev, 0);
 589         if (ret)
 590                 goto err_cleanup_helpers;
 591
 592         return 0;
 593
 594 err_cleanup_helpers:
 595         omap_modeset_disable_external_hpd();
 596         drm_kms_helper_poll_fini(ddev);
 597
 598         omap_fbdev_fini(ddev);
 599 err_cleanup_modeset:
 600         drm_mode_config_cleanup(ddev);
 601         omap_drm_irq_uninstall(ddev);
 602 err_free_drm_dev:
 603         omap_gem_deinit(ddev);
 604         drm_dev_unref(ddev);
 605 err_destroy_wq:
 606         destroy_workqueue(priv->wq);
 607         omap_disconnect_dssdevs();
 608 err_crtc_uninit:
 609         omap_crtc_pre_uninit();
 610         return ret;
 611 }
 612
 613 static void omapdrm_cleanup(struct omap_drm_private *priv)
 614 {
 615         struct drm_device *ddev = priv->ddev;
 616
 617         DBG("");
 618
 619         drm_dev_unregister(ddev);
 620
 621         omap_modeset_disable_external_hpd();
 622         drm_kms_helper_poll_fini(ddev);
 623
 624         omap_fbdev_fini(ddev);
 625
 626         drm_atomic_helper_shutdown(ddev);
 627
 628         drm_mode_config_cleanup(ddev);
 629
 630         omap_drm_irq_uninstall(ddev);
 631         omap_gem_deinit(ddev);
 632
 633         drm_dev_unref(ddev);
 634
 635         destroy_workqueue(priv->wq);
 636
 637         omap_disconnect_dssdevs();
 638         omap_crtc_pre_uninit();
 639 }
 640
 641 static int pdev_probe(struct platform_device *pdev)
 642 {
 643         struct omap_drm_private *priv;
 644         int ret;
 645
 646         if (omapdss_is_initialized() == false)
 647                 return -EPROBE_DEFER;
 648
 649         ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 650         if (ret) {
 651                 dev_err(&pdev->dev, "Failed to set the DMA mask\n");
 652                 return ret;
 653         }
 654
 655         /* Allocate and initialize the driver private structure. */
 656         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 657         if (!priv)
 658                 return -ENOMEM;
 659
 660         platform_set_drvdata(pdev, priv);
 661
 662         ret = omapdrm_init(priv, &pdev->dev);
 663         if (ret < 0)
 664                 kfree(priv);
 665
 666         return ret;
 667 }
 668
 669 static int pdev_remove(struct platform_device *pdev)
 670 {
 671         struct omap_drm_private *priv = platform_get_drvdata(pdev);
 672
 673         omapdrm_cleanup(priv);
 674         kfree(priv);
 675
 676         return 0;
 677 }
 678
 679 #ifdef CONFIG_PM_SLEEP
 680 static int omap_drm_suspend_all_displays(void)
 681 {
 682         struct omap_dss_device *dssdev = NULL;
 683
 684         for_each_dss_dev(dssdev) {
 685                 if (!dssdev->driver)
 686                         continue;
 687
 688                 if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {
 689                         dssdev->driver->disable(dssdev);
 690                         dssdev->activate_after_resume = true;
 691                 } else {
 692                         dssdev->activate_after_resume = false;
 693                 }
 694         }
 695
 696         return 0;
 697 }
 698
 699 static int omap_drm_resume_all_displays(void)
 700 {
 701         struct omap_dss_device *dssdev = NULL;
 702
 703         for_each_dss_dev(dssdev) {
 704                 if (!dssdev->driver)
 705                         continue;
 706
 707                 if (dssdev->activate_after_resume) {
 708                         dssdev->driver->enable(dssdev);
 709                         dssdev->activate_after_resume = false;
 710                 }
 711         }
 712
 713         return 0;
 714 }
 715
 716 static int omap_drm_suspend(struct device *dev)
 717 {
 718         struct omap_drm_private *priv = dev_get_drvdata(dev);
 719         struct drm_device *drm_dev = priv->ddev;
 720
 721         drm_kms_helper_poll_disable(drm_dev);
 722
 723         drm_modeset_lock_all(drm_dev);
 724         omap_drm_suspend_all_displays();
 725         drm_modeset_unlock_all(drm_dev);
 726
 727         return 0;
 728 }
 729
 730 static int omap_drm_resume(struct device *dev)
 731 {
 732         struct omap_drm_private *priv = dev_get_drvdata(dev);
 733         struct drm_device *drm_dev = priv->ddev;
 734
 735         drm_modeset_lock_all(drm_dev);
 736         omap_drm_resume_all_displays();
 737         drm_modeset_unlock_all(drm_dev);
 738
 739         drm_kms_helper_poll_enable(drm_dev);
 740
 741         return omap_gem_resume(drm_dev);
 742 }
 743 #endif
 744
 745 static SIMPLE_DEV_PM_OPS(omapdrm_pm_ops, omap_drm_suspend, omap_drm_resume);
 746
 747 static struct platform_driver pdev = {
 748         .driver = {
 749                 .name = "omapdrm",
 750                 .pm = &omapdrm_pm_ops,
 751         },
 752         .probe = pdev_probe,
 753         .remove = pdev_remove,
 754 };
 755
 756 static struct platform_driver * const drivers[] = {
 757         &omap_dmm_driver,
 758         &pdev,
 759 };
 760
 761 static int __init omap_drm_init(void)
 762 {
 763         DBG("init");
 764
 765         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 766 }
 767
 768 static void __exit omap_drm_fini(void)
 769 {
 770         DBG("fini");
 771
 772         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 773 }
 774
 775 /* need late_initcall() so we load after dss_driver's are loaded */
 776 late_initcall(omap_drm_init);
 777 module_exit(omap_drm_fini);
 778
 779 MODULE_AUTHOR("Rob Clark <rob@ti.com>");
 780 MODULE_DESCRIPTION("OMAP DRM Display Driver");
 781 MODULE_ALIAS("platform:" DRIVER_NAME);
 782 MODULE_LICENSE("GPL v2");