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