drivers/gpu/drm/imx/imx-drm-core.c

   1 /*
   2  * Freescale i.MX drm driver
   3  *
   4  * Copyright (C) 2011 Sascha Hauer, Pengutronix
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  */
  16 #include <linux/component.h>
  17 #include <linux/device.h>
  18 #include <linux/fb.h>
  19 #include <linux/module.h>
  20 #include <linux/of_graph.h>
  21 #include <linux/platform_device.h>
  22 #include <drm/drmP.h>
  23 #include <drm/drm_fb_helper.h>
  24 #include <drm/drm_crtc_helper.h>
  25 #include <drm/drm_gem_cma_helper.h>
  26 #include <drm/drm_fb_cma_helper.h>
  27 #include <drm/drm_plane_helper.h>
  28
  29 #include "imx-drm.h"
  30
  31 #define MAX_CRTC        4
  32
  33 struct imx_drm_crtc;
  34
  35 struct imx_drm_component {
  36         struct device_node *of_node;
  37         struct list_head list;
  38 };
  39
  40 struct imx_drm_device {
  41         struct drm_device                       *drm;
  42         struct imx_drm_crtc                     *crtc[MAX_CRTC];
  43         int                                     pipes;
  44         struct drm_fbdev_cma                    *fbhelper;
  45 };
  46
  47 struct imx_drm_crtc {
  48         struct drm_crtc                         *crtc;
  49         int                                     pipe;
  50         struct imx_drm_crtc_helper_funcs        imx_drm_helper_funcs;
  51         struct device_node                      *port;
  52 };
  53
  54 static int legacyfb_depth = 16;
  55 module_param(legacyfb_depth, int, 0444);
  56
  57 int imx_drm_crtc_id(struct imx_drm_crtc *crtc)
  58 {
  59         return crtc->pipe;
  60 }
  61 EXPORT_SYMBOL_GPL(imx_drm_crtc_id);
  62
  63 static void imx_drm_driver_lastclose(struct drm_device *drm)
  64 {
  65 #if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
  66         struct imx_drm_device *imxdrm = drm->dev_private;
  67
  68         if (imxdrm->fbhelper)
  69                 drm_fbdev_cma_restore_mode(imxdrm->fbhelper);
  70 #endif
  71 }
  72
  73 static int imx_drm_driver_unload(struct drm_device *drm)
  74 {
  75 #if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
  76         struct imx_drm_device *imxdrm = drm->dev_private;
  77 #endif
  78
  79         drm_kms_helper_poll_fini(drm);
  80
  81 #if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
  82         if (imxdrm->fbhelper)
  83                 drm_fbdev_cma_fini(imxdrm->fbhelper);
  84 #endif
  85
  86         component_unbind_all(drm->dev, drm);
  87
  88         drm_vblank_cleanup(drm);
  89         drm_mode_config_cleanup(drm);
  90
  91         platform_set_drvdata(drm->platformdev, NULL);
  92
  93         return 0;
  94 }
  95
  96 static struct imx_drm_crtc *imx_drm_find_crtc(struct drm_crtc *crtc)
  97 {
  98         struct imx_drm_device *imxdrm = crtc->dev->dev_private;
  99         unsigned i;
 100
 101         for (i = 0; i < MAX_CRTC; i++)
 102                 if (imxdrm->crtc[i] && imxdrm->crtc[i]->crtc == crtc)
 103                         return imxdrm->crtc[i];
 104
 105         return NULL;
 106 }
 107
 108 int imx_drm_panel_format_pins(struct drm_encoder *encoder,
 109                 u32 interface_pix_fmt, int hsync_pin, int vsync_pin)
 110 {
 111         struct imx_drm_crtc_helper_funcs *helper;
 112         struct imx_drm_crtc *imx_crtc;
 113
 114         imx_crtc = imx_drm_find_crtc(encoder->crtc);
 115         if (!imx_crtc)
 116                 return -EINVAL;
 117
 118         helper = &imx_crtc->imx_drm_helper_funcs;
 119         if (helper->set_interface_pix_fmt)
 120                 return helper->set_interface_pix_fmt(encoder->crtc,
 121                                 encoder->encoder_type, interface_pix_fmt,
 122                                 hsync_pin, vsync_pin);
 123         return 0;
 124 }
 125 EXPORT_SYMBOL_GPL(imx_drm_panel_format_pins);
 126
 127 int imx_drm_panel_format(struct drm_encoder *encoder, u32 interface_pix_fmt)
 128 {
 129         return imx_drm_panel_format_pins(encoder, interface_pix_fmt, 2, 3);
 130 }
 131 EXPORT_SYMBOL_GPL(imx_drm_panel_format);
 132
 133 int imx_drm_crtc_vblank_get(struct imx_drm_crtc *imx_drm_crtc)
 134 {
 135         return drm_vblank_get(imx_drm_crtc->crtc->dev, imx_drm_crtc->pipe);
 136 }
 137 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_get);
 138
 139 void imx_drm_crtc_vblank_put(struct imx_drm_crtc *imx_drm_crtc)
 140 {
 141         drm_vblank_put(imx_drm_crtc->crtc->dev, imx_drm_crtc->pipe);
 142 }
 143 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_put);
 144
 145 void imx_drm_handle_vblank(struct imx_drm_crtc *imx_drm_crtc)
 146 {
 147         drm_handle_vblank(imx_drm_crtc->crtc->dev, imx_drm_crtc->pipe);
 148 }
 149 EXPORT_SYMBOL_GPL(imx_drm_handle_vblank);
 150
 151 static int imx_drm_enable_vblank(struct drm_device *drm, int crtc)
 152 {
 153         struct imx_drm_device *imxdrm = drm->dev_private;
 154         struct imx_drm_crtc *imx_drm_crtc = imxdrm->crtc[crtc];
 155         int ret;
 156
 157         if (!imx_drm_crtc)
 158                 return -EINVAL;
 159
 160         if (!imx_drm_crtc->imx_drm_helper_funcs.enable_vblank)
 161                 return -ENOSYS;
 162
 163         ret = imx_drm_crtc->imx_drm_helper_funcs.enable_vblank(
 164                         imx_drm_crtc->crtc);
 165
 166         return ret;
 167 }
 168
 169 static void imx_drm_disable_vblank(struct drm_device *drm, int crtc)
 170 {
 171         struct imx_drm_device *imxdrm = drm->dev_private;
 172         struct imx_drm_crtc *imx_drm_crtc = imxdrm->crtc[crtc];
 173
 174         if (!imx_drm_crtc)
 175                 return;
 176
 177         if (!imx_drm_crtc->imx_drm_helper_funcs.disable_vblank)
 178                 return;
 179
 180         imx_drm_crtc->imx_drm_helper_funcs.disable_vblank(imx_drm_crtc->crtc);
 181 }
 182
 183 static void imx_drm_driver_preclose(struct drm_device *drm,
 184                 struct drm_file *file)
 185 {
 186         int i;
 187
 188         if (!file->is_master)
 189                 return;
 190
 191         for (i = 0; i < MAX_CRTC; i++)
 192                 imx_drm_disable_vblank(drm, i);
 193 }
 194
 195 static const struct file_operations imx_drm_driver_fops = {
 196         .owner = THIS_MODULE,
 197         .open = drm_open,
 198         .release = drm_release,
 199         .unlocked_ioctl = drm_ioctl,
 200         .mmap = drm_gem_cma_mmap,
 201         .poll = drm_poll,
 202         .read = drm_read,
 203         .llseek = noop_llseek,
 204 };
 205
 206 void imx_drm_connector_destroy(struct drm_connector *connector)
 207 {
 208         drm_connector_unregister(connector);
 209         drm_connector_cleanup(connector);
 210 }
 211 EXPORT_SYMBOL_GPL(imx_drm_connector_destroy);
 212
 213 void imx_drm_encoder_destroy(struct drm_encoder *encoder)
 214 {
 215         drm_encoder_cleanup(encoder);
 216 }
 217 EXPORT_SYMBOL_GPL(imx_drm_encoder_destroy);
 218
 219 static void imx_drm_output_poll_changed(struct drm_device *drm)
 220 {
 221 #if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
 222         struct imx_drm_device *imxdrm = drm->dev_private;
 223
 224         drm_fbdev_cma_hotplug_event(imxdrm->fbhelper);
 225 #endif
 226 }
 227
 228 static struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
 229         .fb_create = drm_fb_cma_create,
 230         .output_poll_changed = imx_drm_output_poll_changed,
 231 };
 232
 233 /*
 234  * Main DRM initialisation. This binds, initialises and registers
 235  * with DRM the subcomponents of the driver.
 236  */
 237 static int imx_drm_driver_load(struct drm_device *drm, unsigned long flags)
 238 {
 239         struct imx_drm_device *imxdrm;
 240         struct drm_connector *connector;
 241         int ret;
 242
 243         imxdrm = devm_kzalloc(drm->dev, sizeof(*imxdrm), GFP_KERNEL);
 244         if (!imxdrm)
 245                 return -ENOMEM;
 246
 247         imxdrm->drm = drm;
 248
 249         drm->dev_private = imxdrm;
 250
 251         /*
 252          * enable drm irq mode.
 253          * - with irq_enabled = true, we can use the vblank feature.
 254          *
 255          * P.S. note that we wouldn't use drm irq handler but
 256          *      just specific driver own one instead because
 257          *      drm framework supports only one irq handler and
 258          *      drivers can well take care of their interrupts
 259          */
 260         drm->irq_enabled = true;
 261
 262         /*
 263          * set max width and height as default value(4096x4096).
 264          * this value would be used to check framebuffer size limitation
 265          * at drm_mode_addfb().
 266          */
 267         drm->mode_config.min_width = 64;
 268         drm->mode_config.min_height = 64;
 269         drm->mode_config.max_width = 4096;
 270         drm->mode_config.max_height = 4096;
 271         drm->mode_config.funcs = &imx_drm_mode_config_funcs;
 272
 273         drm_mode_config_init(drm);
 274
 275         ret = drm_vblank_init(drm, MAX_CRTC);
 276         if (ret)
 277                 goto err_kms;
 278
 279         /*
 280          * with vblank_disable_allowed = true, vblank interrupt will be
 281          * disabled by drm timer once a current process gives up ownership
 282          * of vblank event. (after drm_vblank_put function is called)
 283          */
 284         drm->vblank_disable_allowed = true;
 285
 286         platform_set_drvdata(drm->platformdev, drm);
 287
 288         /* Now try and bind all our sub-components */
 289         ret = component_bind_all(drm->dev, drm);
 290         if (ret)
 291                 goto err_vblank;
 292
 293         /*
 294          * All components are now added, we can publish the connector sysfs
 295          * entries to userspace.  This will generate hotplug events and so
 296          * userspace will expect to be able to access DRM at this point.
 297          */
 298         list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
 299                 ret = drm_connector_register(connector);
 300                 if (ret) {
 301                         dev_err(drm->dev,
 302                                 "[CONNECTOR:%d:%s] drm_connector_register failed: %d\n",
 303                                 connector->base.id,
 304                                 connector->name, ret);
 305                         goto err_unbind;
 306                 }
 307         }
 308
 309         /*
 310          * All components are now initialised, so setup the fb helper.
 311          * The fb helper takes copies of key hardware information, so the
 312          * crtcs/connectors/encoders must not change after this point.
 313          */
 314 #if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
 315         if (legacyfb_depth != 16 && legacyfb_depth != 32) {
 316                 dev_warn(drm->dev, "Invalid legacyfb_depth.  Defaulting to 16bpp\n");
 317                 legacyfb_depth = 16;
 318         }
 319         imxdrm->fbhelper = drm_fbdev_cma_init(drm, legacyfb_depth,
 320                                 drm->mode_config.num_crtc, MAX_CRTC);
 321         if (IS_ERR(imxdrm->fbhelper)) {
 322                 ret = PTR_ERR(imxdrm->fbhelper);
 323                 imxdrm->fbhelper = NULL;
 324                 goto err_unbind;
 325         }
 326 #endif
 327
 328         drm_kms_helper_poll_init(drm);
 329
 330         return 0;
 331
 332 err_unbind:
 333         component_unbind_all(drm->dev, drm);
 334 err_vblank:
 335         drm_vblank_cleanup(drm);
 336 err_kms:
 337         drm_mode_config_cleanup(drm);
 338
 339         return ret;
 340 }
 341
 342 /*
 343  * imx_drm_add_crtc - add a new crtc
 344  */
 345 int imx_drm_add_crtc(struct drm_device *drm, struct drm_crtc *crtc,
 346                 struct imx_drm_crtc **new_crtc,
 347                 const struct imx_drm_crtc_helper_funcs *imx_drm_helper_funcs,
 348                 struct device_node *port)
 349 {
 350         struct imx_drm_device *imxdrm = drm->dev_private;
 351         struct imx_drm_crtc *imx_drm_crtc;
 352         int ret;
 353
 354         /*
 355          * The vblank arrays are dimensioned by MAX_CRTC - we can't
 356          * pass IDs greater than this to those functions.
 357          */
 358         if (imxdrm->pipes >= MAX_CRTC)
 359                 return -EINVAL;
 360
 361         if (imxdrm->drm->open_count)
 362                 return -EBUSY;
 363
 364         imx_drm_crtc = kzalloc(sizeof(*imx_drm_crtc), GFP_KERNEL);
 365         if (!imx_drm_crtc)
 366                 return -ENOMEM;
 367
 368         imx_drm_crtc->imx_drm_helper_funcs = *imx_drm_helper_funcs;
 369         imx_drm_crtc->pipe = imxdrm->pipes++;
 370         imx_drm_crtc->port = port;
 371         imx_drm_crtc->crtc = crtc;
 372
 373         imxdrm->crtc[imx_drm_crtc->pipe] = imx_drm_crtc;
 374
 375         *new_crtc = imx_drm_crtc;
 376
 377         ret = drm_mode_crtc_set_gamma_size(imx_drm_crtc->crtc, 256);
 378         if (ret)
 379                 goto err_register;
 380
 381         drm_crtc_helper_add(crtc,
 382                         imx_drm_crtc->imx_drm_helper_funcs.crtc_helper_funcs);
 383
 384         drm_crtc_init(drm, crtc,
 385                         imx_drm_crtc->imx_drm_helper_funcs.crtc_funcs);
 386
 387         return 0;
 388
 389 err_register:
 390         imxdrm->crtc[imx_drm_crtc->pipe] = NULL;
 391         kfree(imx_drm_crtc);
 392         return ret;
 393 }
 394 EXPORT_SYMBOL_GPL(imx_drm_add_crtc);
 395
 396 /*
 397  * imx_drm_remove_crtc - remove a crtc
 398  */
 399 int imx_drm_remove_crtc(struct imx_drm_crtc *imx_drm_crtc)
 400 {
 401         struct imx_drm_device *imxdrm = imx_drm_crtc->crtc->dev->dev_private;
 402
 403         drm_crtc_cleanup(imx_drm_crtc->crtc);
 404
 405         imxdrm->crtc[imx_drm_crtc->pipe] = NULL;
 406
 407         kfree(imx_drm_crtc);
 408
 409         return 0;
 410 }
 411 EXPORT_SYMBOL_GPL(imx_drm_remove_crtc);
 412
 413 /*
 414  * Find the DRM CRTC possible mask for the connected endpoint.
 415  *
 416  * The encoder possible masks are defined by their position in the
 417  * mode_config crtc_list.  This means that CRTCs must not be added
 418  * or removed once the DRM device has been fully initialised.
 419  */
 420 static uint32_t imx_drm_find_crtc_mask(struct imx_drm_device *imxdrm,
 421         struct device_node *endpoint)
 422 {
 423         struct device_node *port;
 424         unsigned i;
 425
 426         port = of_graph_get_remote_port(endpoint);
 427         if (!port)
 428                 return 0;
 429         of_node_put(port);
 430
 431         for (i = 0; i < MAX_CRTC; i++) {
 432                 struct imx_drm_crtc *imx_drm_crtc = imxdrm->crtc[i];
 433
 434                 if (imx_drm_crtc && imx_drm_crtc->port == port)
 435                         return drm_crtc_mask(imx_drm_crtc->crtc);
 436         }
 437
 438         return 0;
 439 }
 440
 441 static struct device_node *imx_drm_of_get_next_endpoint(
 442                 const struct device_node *parent, struct device_node *prev)
 443 {
 444         struct device_node *node = of_graph_get_next_endpoint(parent, prev);
 445
 446         of_node_put(prev);
 447         return node;
 448 }
 449
 450 int imx_drm_encoder_parse_of(struct drm_device *drm,
 451         struct drm_encoder *encoder, struct device_node *np)
 452 {
 453         struct imx_drm_device *imxdrm = drm->dev_private;
 454         struct device_node *ep = NULL;
 455         uint32_t crtc_mask = 0;
 456         int i;
 457
 458         for (i = 0; ; i++) {
 459                 u32 mask;
 460
 461                 ep = imx_drm_of_get_next_endpoint(np, ep);
 462                 if (!ep)
 463                         break;
 464
 465                 mask = imx_drm_find_crtc_mask(imxdrm, ep);
 466
 467                 /*
 468                  * If we failed to find the CRTC(s) which this encoder is
 469                  * supposed to be connected to, it's because the CRTC has
 470                  * not been registered yet.  Defer probing, and hope that
 471                  * the required CRTC is added later.
 472                  */
 473                 if (mask == 0)
 474                         return -EPROBE_DEFER;
 475
 476                 crtc_mask |= mask;
 477         }
 478
 479         of_node_put(ep);
 480         if (i == 0)
 481                 return -ENOENT;
 482
 483         encoder->possible_crtcs = crtc_mask;
 484
 485         /* FIXME: this is the mask of outputs which can clone this output. */
 486         encoder->possible_clones = ~0;
 487
 488         return 0;
 489 }
 490 EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
 491
 492 /*
 493  * @node: device tree node containing encoder input ports
 494  * @encoder: drm_encoder
 495  */
 496 int imx_drm_encoder_get_mux_id(struct device_node *node,
 497                                struct drm_encoder *encoder)
 498 {
 499         struct imx_drm_crtc *imx_crtc = imx_drm_find_crtc(encoder->crtc);
 500         struct device_node *ep = NULL;
 501         struct of_endpoint endpoint;
 502         struct device_node *port;
 503         int ret;
 504
 505         if (!node || !imx_crtc)
 506                 return -EINVAL;
 507
 508         do {
 509                 ep = imx_drm_of_get_next_endpoint(node, ep);
 510                 if (!ep)
 511                         break;
 512
 513                 port = of_graph_get_remote_port(ep);
 514                 of_node_put(port);
 515                 if (port == imx_crtc->port) {
 516                         ret = of_graph_parse_endpoint(ep, &endpoint);
 517                         return ret ? ret : endpoint.port;
 518                 }
 519         } while (ep);
 520
 521         return -EINVAL;
 522 }
 523 EXPORT_SYMBOL_GPL(imx_drm_encoder_get_mux_id);
 524
 525 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
 526         /* none so far */
 527 };
 528
 529 static struct drm_driver imx_drm_driver = {
 530         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
 531         .load                   = imx_drm_driver_load,
 532         .unload                 = imx_drm_driver_unload,
 533         .lastclose              = imx_drm_driver_lastclose,
 534         .preclose               = imx_drm_driver_preclose,
 535         .set_busid              = drm_platform_set_busid,
 536         .gem_free_object        = drm_gem_cma_free_object,
 537         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 538         .dumb_create            = drm_gem_cma_dumb_create,
 539         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
 540         .dumb_destroy           = drm_gem_dumb_destroy,
 541
 542         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 543         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 544         .gem_prime_import       = drm_gem_prime_import,
 545         .gem_prime_export       = drm_gem_prime_export,
 546         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 547         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 548         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 549         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 550         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 551         .get_vblank_counter     = drm_vblank_count,
 552         .enable_vblank          = imx_drm_enable_vblank,
 553         .disable_vblank         = imx_drm_disable_vblank,
 554         .ioctls                 = imx_drm_ioctls,
 555         .num_ioctls             = ARRAY_SIZE(imx_drm_ioctls),
 556         .fops                   = &imx_drm_driver_fops,
 557         .name                   = "imx-drm",
 558         .desc                   = "i.MX DRM graphics",
 559         .date                   = "20120507",
 560         .major                  = 1,
 561         .minor                  = 0,
 562         .patchlevel             = 0,
 563 };
 564
 565 static int compare_of(struct device *dev, void *data)
 566 {
 567         struct device_node *np = data;
 568
 569         /* Special case for LDB, one device for two channels */
 570         if (of_node_cmp(np->name, "lvds-channel") == 0) {
 571                 np = of_get_parent(np);
 572                 of_node_put(np);
 573         }
 574
 575         return dev->of_node == np;
 576 }
 577
 578 static int imx_drm_bind(struct device *dev)
 579 {
 580         return drm_platform_init(&imx_drm_driver, to_platform_device(dev));
 581 }
 582
 583 static void imx_drm_unbind(struct device *dev)
 584 {
 585         drm_put_dev(dev_get_drvdata(dev));
 586 }
 587
 588 static const struct component_master_ops imx_drm_ops = {
 589         .bind = imx_drm_bind,
 590         .unbind = imx_drm_unbind,
 591 };
 592
 593 static int imx_drm_platform_probe(struct platform_device *pdev)
 594 {
 595         struct device_node *ep, *port, *remote;
 596         struct component_match *match = NULL;
 597         int ret;
 598         int i;
 599
 600         /*
 601          * Bind the IPU display interface ports first, so that
 602          * imx_drm_encoder_parse_of called from encoder .bind callbacks
 603          * works as expected.
 604          */
 605         for (i = 0; ; i++) {
 606                 port = of_parse_phandle(pdev->dev.of_node, "ports", i);
 607                 if (!port)
 608                         break;
 609
 610                 component_match_add(&pdev->dev, &match, compare_of, port);
 611         }
 612
 613         if (i == 0) {
 614                 dev_err(&pdev->dev, "missing 'ports' property\n");
 615                 return -ENODEV;
 616         }
 617
 618         /* Then bind all encoders */
 619         for (i = 0; ; i++) {
 620                 port = of_parse_phandle(pdev->dev.of_node, "ports", i);
 621                 if (!port)
 622                         break;
 623
 624                 for_each_child_of_node(port, ep) {
 625                         remote = of_graph_get_remote_port_parent(ep);
 626                         if (!remote || !of_device_is_available(remote)) {
 627                                 of_node_put(remote);
 628                                 continue;
 629                         } else if (!of_device_is_available(remote->parent)) {
 630                                 dev_warn(&pdev->dev, "parent device of %s is not available\n",
 631                                          remote->full_name);
 632                                 of_node_put(remote);
 633                                 continue;
 634                         }
 635
 636                         component_match_add(&pdev->dev, &match, compare_of, remote);
 637                         of_node_put(remote);
 638                 }
 639                 of_node_put(port);
 640         }
 641
 642         ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 643         if (ret)
 644                 return ret;
 645
 646         return component_master_add_with_match(&pdev->dev, &imx_drm_ops, match);
 647 }
 648
 649 static int imx_drm_platform_remove(struct platform_device *pdev)
 650 {
 651         component_master_del(&pdev->dev, &imx_drm_ops);
 652         return 0;
 653 }
 654
 655 #ifdef CONFIG_PM_SLEEP
 656 static int imx_drm_suspend(struct device *dev)
 657 {
 658         struct drm_device *drm_dev = dev_get_drvdata(dev);
 659
 660         /* The drm_dev is NULL before .load hook is called */
 661         if (drm_dev == NULL)
 662                 return 0;
 663
 664         drm_kms_helper_poll_disable(drm_dev);
 665
 666         return 0;
 667 }
 668
 669 static int imx_drm_resume(struct device *dev)
 670 {
 671         struct drm_device *drm_dev = dev_get_drvdata(dev);
 672
 673         if (drm_dev == NULL)
 674                 return 0;
 675
 676         drm_helper_resume_force_mode(drm_dev);
 677         drm_kms_helper_poll_enable(drm_dev);
 678
 679         return 0;
 680 }
 681 #endif
 682
 683 static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
 684
 685 static const struct of_device_id imx_drm_dt_ids[] = {
 686         { .compatible = "fsl,imx-display-subsystem", },
 687         { /* sentinel */ },
 688 };
 689 MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
 690
 691 static struct platform_driver imx_drm_pdrv = {
 692         .probe          = imx_drm_platform_probe,
 693         .remove         = imx_drm_platform_remove,
 694         .driver         = {
 695                 .owner  = THIS_MODULE,
 696                 .name   = "imx-drm",
 697                 .pm     = &imx_drm_pm_ops,
 698                 .of_match_table = imx_drm_dt_ids,
 699         },
 700 };
 701 module_platform_driver(imx_drm_pdrv);
 702
 703 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 704 MODULE_DESCRIPTION("i.MX drm driver core");
 705 MODULE_LICENSE("GPL");