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