drivers/gpu/drm/exynos/exynos_drm_vidi.c

   1 /* exynos_drm_vidi.c
   2  *
   3  * Copyright (C) 2012 Samsung Electronics Co.Ltd
   4  * Authors:
   5  *      Inki Dae <inki.dae@samsung.com>
   6  *
   7  * This program is free software; you can redistribute  it and/or modify it
   8  * under  the terms of  the GNU General  Public License as published by the
   9  * Free Software Foundation;  either version 2 of the  License, or (at your
  10  * option) any later version.
  11  *
  12  */
  13 #include <drm/drmP.h>
  14
  15 #include <linux/kernel.h>
  16 #include <linux/platform_device.h>
  17
  18 #include <drm/exynos_drm.h>
  19
  20 #include <drm/drm_edid.h>
  21 #include <drm/drm_crtc_helper.h>
  22
  23 #include "exynos_drm_drv.h"
  24 #include "exynos_drm_crtc.h"
  25 #include "exynos_drm_encoder.h"
  26 #include "exynos_drm_vidi.h"
  27
  28 /* vidi has totally three virtual windows. */
  29 #define WINDOWS_NR              3
  30
  31 #define get_vidi_mgr(dev)       platform_get_drvdata(to_platform_device(dev))
  32 #define ctx_from_connector(c)   container_of(c, struct vidi_context, \
  33                                         connector)
  34
  35 struct vidi_win_data {
  36         unsigned int            offset_x;
  37         unsigned int            offset_y;
  38         unsigned int            ovl_width;
  39         unsigned int            ovl_height;
  40         unsigned int            fb_width;
  41         unsigned int            fb_height;
  42         unsigned int            bpp;
  43         dma_addr_t              dma_addr;
  44         unsigned int            buf_offsize;
  45         unsigned int            line_size;      /* bytes */
  46         bool                    enabled;
  47 };
  48
  49 struct vidi_context {
  50         struct drm_device               *drm_dev;
  51         struct drm_crtc                 *crtc;
  52         struct drm_encoder              *encoder;
  53         struct drm_connector            connector;
  54         struct exynos_drm_subdrv        subdrv;
  55         struct vidi_win_data            win_data[WINDOWS_NR];
  56         struct edid                     *raw_edid;
  57         unsigned int                    clkdiv;
  58         unsigned int                    default_win;
  59         unsigned long                   irq_flags;
  60         unsigned int                    connected;
  61         bool                            vblank_on;
  62         bool                            suspended;
  63         bool                            direct_vblank;
  64         struct work_struct              work;
  65         struct mutex                    lock;
  66         int                             pipe;
  67 };
  68
  69 static const char fake_edid_info[] = {
  70         0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x4c, 0x2d, 0x05, 0x05,
  71         0x00, 0x00, 0x00, 0x00, 0x30, 0x12, 0x01, 0x03, 0x80, 0x10, 0x09, 0x78,
  72         0x0a, 0xee, 0x91, 0xa3, 0x54, 0x4c, 0x99, 0x26, 0x0f, 0x50, 0x54, 0xbd,
  73         0xee, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
  74         0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xb0, 0x51, 0x00,
  75         0x1b, 0x30, 0x40, 0x70, 0x36, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e,
  76         0x01, 0x1d, 0x00, 0x72, 0x51, 0xd0, 0x1e, 0x20, 0x6e, 0x28, 0x55, 0x00,
  77         0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18,
  78         0x4b, 0x1a, 0x44, 0x17, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
  79         0x00, 0x00, 0x00, 0xfc, 0x00, 0x53, 0x41, 0x4d, 0x53, 0x55, 0x4e, 0x47,
  80         0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0xbc, 0x02, 0x03, 0x1e, 0xf1,
  81         0x46, 0x84, 0x05, 0x03, 0x10, 0x20, 0x22, 0x23, 0x09, 0x07, 0x07, 0x83,
  82         0x01, 0x00, 0x00, 0xe2, 0x00, 0x0f, 0x67, 0x03, 0x0c, 0x00, 0x10, 0x00,
  83         0xb8, 0x2d, 0x01, 0x1d, 0x80, 0x18, 0x71, 0x1c, 0x16, 0x20, 0x58, 0x2c,
  84         0x25, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x9e, 0x8c, 0x0a, 0xd0, 0x8a,
  85         0x20, 0xe0, 0x2d, 0x10, 0x10, 0x3e, 0x96, 0x00, 0xa0, 0x5a, 0x00, 0x00,
  86         0x00, 0x18, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
  87         0x45, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0x00,
  88         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  89         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  90         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  91         0x00, 0x00, 0x00, 0x06
  92 };
  93
  94 static void vidi_apply(struct exynos_drm_manager *mgr)
  95 {
  96         struct vidi_context *ctx = mgr->ctx;
  97         struct exynos_drm_manager_ops *mgr_ops = mgr->ops;
  98         struct vidi_win_data *win_data;
  99         int i;
 100
 101         for (i = 0; i < WINDOWS_NR; i++) {
 102                 win_data = &ctx->win_data[i];
 103                 if (win_data->enabled && (mgr_ops && mgr_ops->win_commit))
 104                         mgr_ops->win_commit(mgr, i);
 105         }
 106
 107         if (mgr_ops && mgr_ops->commit)
 108                 mgr_ops->commit(mgr);
 109 }
 110
 111 static void vidi_commit(struct exynos_drm_manager *mgr)
 112 {
 113         struct vidi_context *ctx = mgr->ctx;
 114
 115         if (ctx->suspended)
 116                 return;
 117 }
 118
 119 static int vidi_enable_vblank(struct exynos_drm_manager *mgr)
 120 {
 121         struct vidi_context *ctx = mgr->ctx;
 122
 123         if (ctx->suspended)
 124                 return -EPERM;
 125
 126         if (!test_and_set_bit(0, &ctx->irq_flags))
 127                 ctx->vblank_on = true;
 128
 129         ctx->direct_vblank = true;
 130
 131         /*
 132          * in case of page flip request, vidi_finish_pageflip function
 133          * will not be called because direct_vblank is true and then
 134          * that function will be called by manager_ops->win_commit callback
 135          */
 136         schedule_work(&ctx->work);
 137
 138         return 0;
 139 }
 140
 141 static void vidi_disable_vblank(struct exynos_drm_manager *mgr)
 142 {
 143         struct vidi_context *ctx = mgr->ctx;
 144
 145         if (ctx->suspended)
 146                 return;
 147
 148         if (test_and_clear_bit(0, &ctx->irq_flags))
 149                 ctx->vblank_on = false;
 150 }
 151
 152 static void vidi_win_mode_set(struct exynos_drm_manager *mgr,
 153                         struct exynos_drm_overlay *overlay)
 154 {
 155         struct vidi_context *ctx = mgr->ctx;
 156         struct vidi_win_data *win_data;
 157         int win;
 158         unsigned long offset;
 159
 160         if (!overlay) {
 161                 DRM_ERROR("overlay is NULL\n");
 162                 return;
 163         }
 164
 165         win = overlay->zpos;
 166         if (win == DEFAULT_ZPOS)
 167                 win = ctx->default_win;
 168
 169         if (win < 0 || win >= WINDOWS_NR)
 170                 return;
 171
 172         offset = overlay->fb_x * (overlay->bpp >> 3);
 173         offset += overlay->fb_y * overlay->pitch;
 174
 175         DRM_DEBUG_KMS("offset = 0x%lx, pitch = %x\n", offset, overlay->pitch);
 176
 177         win_data = &ctx->win_data[win];
 178
 179         win_data->offset_x = overlay->crtc_x;
 180         win_data->offset_y = overlay->crtc_y;
 181         win_data->ovl_width = overlay->crtc_width;
 182         win_data->ovl_height = overlay->crtc_height;
 183         win_data->fb_width = overlay->fb_width;
 184         win_data->fb_height = overlay->fb_height;
 185         win_data->dma_addr = overlay->dma_addr[0] + offset;
 186         win_data->bpp = overlay->bpp;
 187         win_data->buf_offsize = (overlay->fb_width - overlay->crtc_width) *
 188                                 (overlay->bpp >> 3);
 189         win_data->line_size = overlay->crtc_width * (overlay->bpp >> 3);
 190
 191         /*
 192          * some parts of win_data should be transferred to user side
 193          * through specific ioctl.
 194          */
 195
 196         DRM_DEBUG_KMS("offset_x = %d, offset_y = %d\n",
 197                         win_data->offset_x, win_data->offset_y);
 198         DRM_DEBUG_KMS("ovl_width = %d, ovl_height = %d\n",
 199                         win_data->ovl_width, win_data->ovl_height);
 200         DRM_DEBUG_KMS("paddr = 0x%lx\n", (unsigned long)win_data->dma_addr);
 201         DRM_DEBUG_KMS("fb_width = %d, crtc_width = %d\n",
 202                         overlay->fb_width, overlay->crtc_width);
 203 }
 204
 205 static void vidi_win_commit(struct exynos_drm_manager *mgr, int zpos)
 206 {
 207         struct vidi_context *ctx = mgr->ctx;
 208         struct vidi_win_data *win_data;
 209         int win = zpos;
 210
 211         if (ctx->suspended)
 212                 return;
 213
 214         if (win == DEFAULT_ZPOS)
 215                 win = ctx->default_win;
 216
 217         if (win < 0 || win >= WINDOWS_NR)
 218                 return;
 219
 220         win_data = &ctx->win_data[win];
 221
 222         win_data->enabled = true;
 223
 224         DRM_DEBUG_KMS("dma_addr = %pad\n", &win_data->dma_addr);
 225
 226         if (ctx->vblank_on)
 227                 schedule_work(&ctx->work);
 228 }
 229
 230 static void vidi_win_disable(struct exynos_drm_manager *mgr, int zpos)
 231 {
 232         struct vidi_context *ctx = mgr->ctx;
 233         struct vidi_win_data *win_data;
 234         int win = zpos;
 235
 236         if (win == DEFAULT_ZPOS)
 237                 win = ctx->default_win;
 238
 239         if (win < 0 || win >= WINDOWS_NR)
 240                 return;
 241
 242         win_data = &ctx->win_data[win];
 243         win_data->enabled = false;
 244
 245         /* TODO. */
 246 }
 247
 248 static int vidi_power_on(struct exynos_drm_manager *mgr, bool enable)
 249 {
 250         struct vidi_context *ctx = mgr->ctx;
 251
 252         DRM_DEBUG_KMS("%s\n", __FILE__);
 253
 254         if (enable != false && enable != true)
 255                 return -EINVAL;
 256
 257         if (enable) {
 258                 ctx->suspended = false;
 259
 260                 /* if vblank was enabled status, enable it again. */
 261                 if (test_and_clear_bit(0, &ctx->irq_flags))
 262                         vidi_enable_vblank(mgr);
 263
 264                 vidi_apply(mgr);
 265         } else {
 266                 ctx->suspended = true;
 267         }
 268
 269         return 0;
 270 }
 271
 272 static void vidi_dpms(struct exynos_drm_manager *mgr, int mode)
 273 {
 274         struct vidi_context *ctx = mgr->ctx;
 275
 276         DRM_DEBUG_KMS("%d\n", mode);
 277
 278         mutex_lock(&ctx->lock);
 279
 280         switch (mode) {
 281         case DRM_MODE_DPMS_ON:
 282                 vidi_power_on(mgr, true);
 283                 break;
 284         case DRM_MODE_DPMS_STANDBY:
 285         case DRM_MODE_DPMS_SUSPEND:
 286         case DRM_MODE_DPMS_OFF:
 287                 vidi_power_on(mgr, false);
 288                 break;
 289         default:
 290                 DRM_DEBUG_KMS("unspecified mode %d\n", mode);
 291                 break;
 292         }
 293
 294         mutex_unlock(&ctx->lock);
 295 }
 296
 297 static int vidi_mgr_initialize(struct exynos_drm_manager *mgr,
 298                         struct drm_device *drm_dev)
 299 {
 300         struct vidi_context *ctx = mgr->ctx;
 301         struct exynos_drm_private *priv = drm_dev->dev_private;
 302
 303         mgr->drm_dev = ctx->drm_dev = drm_dev;
 304         mgr->pipe = ctx->pipe = priv->pipe++;
 305
 306         return 0;
 307 }
 308
 309 static struct exynos_drm_manager_ops vidi_manager_ops = {
 310         .dpms = vidi_dpms,
 311         .commit = vidi_commit,
 312         .enable_vblank = vidi_enable_vblank,
 313         .disable_vblank = vidi_disable_vblank,
 314         .win_mode_set = vidi_win_mode_set,
 315         .win_commit = vidi_win_commit,
 316         .win_disable = vidi_win_disable,
 317 };
 318
 319 static struct exynos_drm_manager vidi_manager = {
 320         .type = EXYNOS_DISPLAY_TYPE_VIDI,
 321         .ops = &vidi_manager_ops,
 322 };
 323
 324 static void vidi_fake_vblank_handler(struct work_struct *work)
 325 {
 326         struct vidi_context *ctx = container_of(work, struct vidi_context,
 327                                         work);
 328
 329         if (ctx->pipe < 0)
 330                 return;
 331
 332         /* refresh rate is about 50Hz. */
 333         usleep_range(16000, 20000);
 334
 335         mutex_lock(&ctx->lock);
 336
 337         if (ctx->direct_vblank) {
 338                 drm_handle_vblank(ctx->drm_dev, ctx->pipe);
 339                 ctx->direct_vblank = false;
 340                 mutex_unlock(&ctx->lock);
 341                 return;
 342         }
 343
 344         mutex_unlock(&ctx->lock);
 345
 346         exynos_drm_crtc_finish_pageflip(ctx->drm_dev, ctx->pipe);
 347 }
 348
 349 static int vidi_show_connection(struct device *dev,
 350                                 struct device_attribute *attr, char *buf)
 351 {
 352         int rc;
 353         struct exynos_drm_manager *mgr = get_vidi_mgr(dev);
 354         struct vidi_context *ctx = mgr->ctx;
 355
 356         mutex_lock(&ctx->lock);
 357
 358         rc = sprintf(buf, "%d\n", ctx->connected);
 359
 360         mutex_unlock(&ctx->lock);
 361
 362         return rc;
 363 }
 364
 365 static int vidi_store_connection(struct device *dev,
 366                                 struct device_attribute *attr,
 367                                 const char *buf, size_t len)
 368 {
 369         struct exynos_drm_manager *mgr = get_vidi_mgr(dev);
 370         struct vidi_context *ctx = mgr->ctx;
 371         int ret;
 372
 373         ret = kstrtoint(buf, 0, &ctx->connected);
 374         if (ret)
 375                 return ret;
 376
 377         if (ctx->connected > 1)
 378                 return -EINVAL;
 379
 380         /* use fake edid data for test. */
 381         if (!ctx->raw_edid)
 382                 ctx->raw_edid = (struct edid *)fake_edid_info;
 383
 384         /* if raw_edid isn't same as fake data then it can't be tested. */
 385         if (ctx->raw_edid != (struct edid *)fake_edid_info) {
 386                 DRM_DEBUG_KMS("edid data is not fake data.\n");
 387                 return -EINVAL;
 388         }
 389
 390         DRM_DEBUG_KMS("requested connection.\n");
 391
 392         drm_helper_hpd_irq_event(ctx->drm_dev);
 393
 394         return len;
 395 }
 396
 397 static DEVICE_ATTR(connection, 0644, vidi_show_connection,
 398                         vidi_store_connection);
 399
 400 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data,
 401                                 struct drm_file *file_priv)
 402 {
 403         struct vidi_context *ctx = NULL;
 404         struct drm_encoder *encoder;
 405         struct exynos_drm_display *display;
 406         struct drm_exynos_vidi_connection *vidi = data;
 407
 408         if (!vidi) {
 409                 DRM_DEBUG_KMS("user data for vidi is null.\n");
 410                 return -EINVAL;
 411         }
 412
 413         if (vidi->connection > 1) {
 414                 DRM_DEBUG_KMS("connection should be 0 or 1.\n");
 415                 return -EINVAL;
 416         }
 417
 418         list_for_each_entry(encoder, &drm_dev->mode_config.encoder_list,
 419                                                                 head) {
 420                 display = exynos_drm_get_display(encoder);
 421
 422                 if (display->type == EXYNOS_DISPLAY_TYPE_VIDI) {
 423                         ctx = display->ctx;
 424                         break;
 425                 }
 426         }
 427
 428         if (!ctx) {
 429                 DRM_DEBUG_KMS("not found virtual device type encoder.\n");
 430                 return -EINVAL;
 431         }
 432
 433         if (ctx->connected == vidi->connection) {
 434                 DRM_DEBUG_KMS("same connection request.\n");
 435                 return -EINVAL;
 436         }
 437
 438         if (vidi->connection) {
 439                 struct edid *raw_edid  = (struct edid *)(uint32_t)vidi->edid;
 440                 if (!drm_edid_is_valid(raw_edid)) {
 441                         DRM_DEBUG_KMS("edid data is invalid.\n");
 442                         return -EINVAL;
 443                 }
 444                 ctx->raw_edid = drm_edid_duplicate(raw_edid);
 445                 if (!ctx->raw_edid) {
 446                         DRM_DEBUG_KMS("failed to allocate raw_edid.\n");
 447                         return -ENOMEM;
 448                 }
 449         } else {
 450                 /*
 451                  * with connection = 0, free raw_edid
 452                  * only if raw edid data isn't same as fake data.
 453                  */
 454                 if (ctx->raw_edid && ctx->raw_edid !=
 455                                 (struct edid *)fake_edid_info) {
 456                         kfree(ctx->raw_edid);
 457                         ctx->raw_edid = NULL;
 458                 }
 459         }
 460
 461         ctx->connected = vidi->connection;
 462         drm_helper_hpd_irq_event(ctx->drm_dev);
 463
 464         return 0;
 465 }
 466
 467 static enum drm_connector_status vidi_detect(struct drm_connector *connector,
 468                         bool force)
 469 {
 470         struct vidi_context *ctx = ctx_from_connector(connector);
 471
 472         /*
 473          * connection request would come from user side
 474          * to do hotplug through specific ioctl.
 475          */
 476         return ctx->connected ? connector_status_connected :
 477                         connector_status_disconnected;
 478 }
 479
 480 static void vidi_connector_destroy(struct drm_connector *connector)
 481 {
 482 }
 483
 484 static struct drm_connector_funcs vidi_connector_funcs = {
 485         .dpms = drm_helper_connector_dpms,
 486         .fill_modes = drm_helper_probe_single_connector_modes,
 487         .detect = vidi_detect,
 488         .destroy = vidi_connector_destroy,
 489 };
 490
 491 static int vidi_get_modes(struct drm_connector *connector)
 492 {
 493         struct vidi_context *ctx = ctx_from_connector(connector);
 494         struct edid *edid;
 495         int edid_len;
 496
 497         /*
 498          * the edid data comes from user side and it would be set
 499          * to ctx->raw_edid through specific ioctl.
 500          */
 501         if (!ctx->raw_edid) {
 502                 DRM_DEBUG_KMS("raw_edid is null.\n");
 503                 return -EFAULT;
 504         }
 505
 506         edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH;
 507         edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL);
 508         if (!edid) {
 509                 DRM_DEBUG_KMS("failed to allocate edid\n");
 510                 return -ENOMEM;
 511         }
 512
 513         drm_mode_connector_update_edid_property(connector, edid);
 514
 515         return drm_add_edid_modes(connector, edid);
 516 }
 517
 518 static struct drm_encoder *vidi_best_encoder(struct drm_connector *connector)
 519 {
 520         struct vidi_context *ctx = ctx_from_connector(connector);
 521
 522         return ctx->encoder;
 523 }
 524
 525 static struct drm_connector_helper_funcs vidi_connector_helper_funcs = {
 526         .get_modes = vidi_get_modes,
 527         .best_encoder = vidi_best_encoder,
 528 };
 529
 530 static int vidi_create_connector(struct exynos_drm_display *display,
 531                                 struct drm_encoder *encoder)
 532 {
 533         struct vidi_context *ctx = display->ctx;
 534         struct drm_connector *connector = &ctx->connector;
 535         int ret;
 536
 537         ctx->encoder = encoder;
 538         connector->polled = DRM_CONNECTOR_POLL_HPD;
 539
 540         ret = drm_connector_init(ctx->drm_dev, connector,
 541                         &vidi_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
 542         if (ret) {
 543                 DRM_ERROR("Failed to initialize connector with drm\n");
 544                 return ret;
 545         }
 546
 547         drm_connector_helper_add(connector, &vidi_connector_helper_funcs);
 548         drm_connector_register(connector);
 549         drm_mode_connector_attach_encoder(connector, encoder);
 550
 551         return 0;
 552 }
 553
 554
 555 static struct exynos_drm_display_ops vidi_display_ops = {
 556         .create_connector = vidi_create_connector,
 557 };
 558
 559 static struct exynos_drm_display vidi_display = {
 560         .type = EXYNOS_DISPLAY_TYPE_VIDI,
 561         .ops = &vidi_display_ops,
 562 };
 563
 564 static int vidi_subdrv_probe(struct drm_device *drm_dev, struct device *dev)
 565 {
 566         struct exynos_drm_manager *mgr = get_vidi_mgr(dev);
 567         struct vidi_context *ctx = mgr->ctx;
 568         struct drm_crtc *crtc = ctx->crtc;
 569         int ret;
 570
 571         vidi_mgr_initialize(mgr, drm_dev);
 572
 573         ret = exynos_drm_crtc_create(&vidi_manager);
 574         if (ret) {
 575                 DRM_ERROR("failed to create crtc.\n");
 576                 return ret;
 577         }
 578
 579         ret = exynos_drm_create_enc_conn(drm_dev, &vidi_display);
 580         if (ret) {
 581                 crtc->funcs->destroy(crtc);
 582                 DRM_ERROR("failed to create encoder and connector.\n");
 583                 return ret;
 584         }
 585
 586         return 0;
 587 }
 588
 589 static int vidi_probe(struct platform_device *pdev)
 590 {
 591         struct exynos_drm_subdrv *subdrv;
 592         struct vidi_context *ctx;
 593         int ret;
 594
 595         ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
 596         if (!ctx)
 597                 return -ENOMEM;
 598
 599         ctx->default_win = 0;
 600
 601         INIT_WORK(&ctx->work, vidi_fake_vblank_handler);
 602
 603         vidi_manager.ctx = ctx;
 604         vidi_display.ctx = ctx;
 605
 606         mutex_init(&ctx->lock);
 607
 608         platform_set_drvdata(pdev, &vidi_manager);
 609
 610         subdrv = &ctx->subdrv;
 611         subdrv->dev = &pdev->dev;
 612         subdrv->probe = vidi_subdrv_probe;
 613
 614         ret = exynos_drm_subdrv_register(subdrv);
 615         if (ret < 0) {
 616                 dev_err(&pdev->dev, "failed to register drm vidi device\n");
 617                 return ret;
 618         }
 619
 620         ret = device_create_file(&pdev->dev, &dev_attr_connection);
 621         if (ret < 0) {
 622                 exynos_drm_subdrv_unregister(subdrv);
 623                 DRM_INFO("failed to create connection sysfs.\n");
 624         }
 625
 626         return 0;
 627 }
 628
 629 static int vidi_remove(struct platform_device *pdev)
 630 {
 631         struct exynos_drm_manager *mgr = platform_get_drvdata(pdev);
 632         struct vidi_context *ctx = mgr->ctx;
 633
 634         if (ctx->raw_edid != (struct edid *)fake_edid_info) {
 635                 kfree(ctx->raw_edid);
 636                 ctx->raw_edid = NULL;
 637
 638                 return -EINVAL;
 639         }
 640
 641         return 0;
 642 }
 643
 644 struct platform_driver vidi_driver = {
 645         .probe          = vidi_probe,
 646         .remove         = vidi_remove,
 647         .driver         = {
 648                 .name   = "exynos-drm-vidi",
 649                 .owner  = THIS_MODULE,
 650         },
 651 };
 652
 653 int exynos_drm_probe_vidi(void)
 654 {
 655         struct platform_device *pdev;
 656         int ret;
 657
 658         pdev = platform_device_register_simple("exynos-drm-vidi", -1, NULL, 0);
 659         if (IS_ERR(pdev))
 660                 return PTR_ERR(pdev);
 661
 662         ret = platform_driver_register(&vidi_driver);
 663         if (ret) {
 664                 platform_device_unregister(pdev);
 665                 return ret;
 666         }
 667
 668         return ret;
 669 }
 670
 671 void exynos_drm_remove_vidi(void)
 672 {
 673         struct vidi_context *ctx = vidi_manager.ctx;
 674         struct exynos_drm_subdrv *subdrv = &ctx->subdrv;
 675         struct platform_device *pdev = to_platform_device(subdrv->dev);
 676
 677         platform_driver_unregister(&vidi_driver);
 678         platform_device_unregister(pdev);
 679 }