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 #include <linux/component.h>
  18
  19 #include <drm/exynos_drm.h>
  20
  21 #include <drm/drm_edid.h>
  22 #include <drm/drm_crtc_helper.h>
  23 #include <drm/drm_atomic_helper.h>
  24
  25 #include "exynos_drm_drv.h"
  26 #include "exynos_drm_crtc.h"
  27 #include "exynos_drm_plane.h"
  28 #include "exynos_drm_encoder.h"
  29 #include "exynos_drm_vidi.h"
  30
  31 /* vidi has totally three virtual windows. */
  32 #define WINDOWS_NR              3
  33
  34 #define ctx_from_connector(c)   container_of(c, struct vidi_context, \
  35                                         connector)
  36
  37 struct vidi_context {
  38         struct exynos_drm_display       display;
  39         struct platform_device          *pdev;
  40         struct drm_device               *drm_dev;
  41         struct exynos_drm_crtc          *crtc;
  42         struct drm_encoder              *encoder;
  43         struct drm_connector            connector;
  44         struct exynos_drm_plane         planes[WINDOWS_NR];
  45         struct edid                     *raw_edid;
  46         unsigned int                    clkdiv;
  47         unsigned int                    default_win;
  48         unsigned long                   irq_flags;
  49         unsigned int                    connected;
  50         bool                            vblank_on;
  51         bool                            suspended;
  52         bool                            direct_vblank;
  53         struct work_struct              work;
  54         struct mutex                    lock;
  55         int                             pipe;
  56 };
  57
  58 static inline struct vidi_context *display_to_vidi(struct exynos_drm_display *d)
  59 {
  60         return container_of(d, struct vidi_context, display);
  61 }
  62
  63 static const char fake_edid_info[] = {
  64         0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x4c, 0x2d, 0x05, 0x05,
  65         0x00, 0x00, 0x00, 0x00, 0x30, 0x12, 0x01, 0x03, 0x80, 0x10, 0x09, 0x78,
  66         0x0a, 0xee, 0x91, 0xa3, 0x54, 0x4c, 0x99, 0x26, 0x0f, 0x50, 0x54, 0xbd,
  67         0xee, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
  68         0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xb0, 0x51, 0x00,
  69         0x1b, 0x30, 0x40, 0x70, 0x36, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e,
  70         0x01, 0x1d, 0x00, 0x72, 0x51, 0xd0, 0x1e, 0x20, 0x6e, 0x28, 0x55, 0x00,
  71         0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18,
  72         0x4b, 0x1a, 0x44, 0x17, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
  73         0x00, 0x00, 0x00, 0xfc, 0x00, 0x53, 0x41, 0x4d, 0x53, 0x55, 0x4e, 0x47,
  74         0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0xbc, 0x02, 0x03, 0x1e, 0xf1,
  75         0x46, 0x84, 0x05, 0x03, 0x10, 0x20, 0x22, 0x23, 0x09, 0x07, 0x07, 0x83,
  76         0x01, 0x00, 0x00, 0xe2, 0x00, 0x0f, 0x67, 0x03, 0x0c, 0x00, 0x10, 0x00,
  77         0xb8, 0x2d, 0x01, 0x1d, 0x80, 0x18, 0x71, 0x1c, 0x16, 0x20, 0x58, 0x2c,
  78         0x25, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x9e, 0x8c, 0x0a, 0xd0, 0x8a,
  79         0x20, 0xe0, 0x2d, 0x10, 0x10, 0x3e, 0x96, 0x00, 0xa0, 0x5a, 0x00, 0x00,
  80         0x00, 0x18, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
  81         0x45, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0x00,
  82         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  83         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  84         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  85         0x00, 0x00, 0x00, 0x06
  86 };
  87
  88 static int vidi_enable_vblank(struct exynos_drm_crtc *crtc)
  89 {
  90         struct vidi_context *ctx = crtc->ctx;
  91
  92         if (ctx->suspended)
  93                 return -EPERM;
  94
  95         if (!test_and_set_bit(0, &ctx->irq_flags))
  96                 ctx->vblank_on = true;
  97
  98         ctx->direct_vblank = true;
  99
 100         /*
 101          * in case of page flip request, vidi_finish_pageflip function
 102          * will not be called because direct_vblank is true and then
 103          * that function will be called by crtc_ops->win_commit callback
 104          */
 105         schedule_work(&ctx->work);
 106
 107         return 0;
 108 }
 109
 110 static void vidi_disable_vblank(struct exynos_drm_crtc *crtc)
 111 {
 112         struct vidi_context *ctx = crtc->ctx;
 113
 114         if (ctx->suspended)
 115                 return;
 116
 117         if (test_and_clear_bit(0, &ctx->irq_flags))
 118                 ctx->vblank_on = false;
 119 }
 120
 121 static void vidi_win_commit(struct exynos_drm_crtc *crtc, unsigned int win)
 122 {
 123         struct vidi_context *ctx = crtc->ctx;
 124         struct exynos_drm_plane *plane;
 125
 126         if (ctx->suspended)
 127                 return;
 128
 129         if (win < 0 || win >= WINDOWS_NR)
 130                 return;
 131
 132         plane = &ctx->planes[win];
 133
 134         plane->enabled = true;
 135
 136         DRM_DEBUG_KMS("dma_addr = %pad\n", plane->dma_addr);
 137
 138         if (ctx->vblank_on)
 139                 schedule_work(&ctx->work);
 140 }
 141
 142 static void vidi_win_disable(struct exynos_drm_crtc *crtc, unsigned int win)
 143 {
 144         struct vidi_context *ctx = crtc->ctx;
 145         struct exynos_drm_plane *plane;
 146
 147         if (win < 0 || win >= WINDOWS_NR)
 148                 return;
 149
 150         plane = &ctx->planes[win];
 151         plane->enabled = false;
 152
 153         /* TODO. */
 154 }
 155
 156 static void vidi_enable(struct exynos_drm_crtc *crtc)
 157 {
 158         struct vidi_context *ctx = crtc->ctx;
 159         struct exynos_drm_plane *plane;
 160         int i;
 161
 162         mutex_lock(&ctx->lock);
 163
 164         ctx->suspended = false;
 165
 166         /* if vblank was enabled status, enable it again. */
 167         if (test_and_clear_bit(0, &ctx->irq_flags))
 168                 vidi_enable_vblank(ctx->crtc);
 169
 170         for (i = 0; i < WINDOWS_NR; i++) {
 171                 plane = &ctx->planes[i];
 172                 if (plane->enabled)
 173                         vidi_win_commit(ctx->crtc, i);
 174         }
 175
 176         mutex_unlock(&ctx->lock);
 177 }
 178
 179 static void vidi_disable(struct exynos_drm_crtc *crtc)
 180 {
 181         struct vidi_context *ctx = crtc->ctx;
 182
 183         mutex_lock(&ctx->lock);
 184
 185         ctx->suspended = true;
 186
 187         mutex_unlock(&ctx->lock);
 188 }
 189
 190 static int vidi_ctx_initialize(struct vidi_context *ctx,
 191                         struct drm_device *drm_dev)
 192 {
 193         struct exynos_drm_private *priv = drm_dev->dev_private;
 194
 195         ctx->drm_dev = drm_dev;
 196         ctx->pipe = priv->pipe++;
 197
 198         return 0;
 199 }
 200
 201 static const struct exynos_drm_crtc_ops vidi_crtc_ops = {
 202         .enable = vidi_enable,
 203         .disable = vidi_disable,
 204         .enable_vblank = vidi_enable_vblank,
 205         .disable_vblank = vidi_disable_vblank,
 206         .win_commit = vidi_win_commit,
 207         .win_disable = vidi_win_disable,
 208 };
 209
 210 static void vidi_fake_vblank_handler(struct work_struct *work)
 211 {
 212         struct vidi_context *ctx = container_of(work, struct vidi_context,
 213                                         work);
 214
 215         if (ctx->pipe < 0)
 216                 return;
 217
 218         /* refresh rate is about 50Hz. */
 219         usleep_range(16000, 20000);
 220
 221         mutex_lock(&ctx->lock);
 222
 223         if (ctx->direct_vblank) {
 224                 drm_handle_vblank(ctx->drm_dev, ctx->pipe);
 225                 ctx->direct_vblank = false;
 226                 mutex_unlock(&ctx->lock);
 227                 return;
 228         }
 229
 230         mutex_unlock(&ctx->lock);
 231
 232         exynos_drm_crtc_finish_pageflip(ctx->drm_dev, ctx->pipe);
 233 }
 234
 235 static int vidi_show_connection(struct device *dev,
 236                                 struct device_attribute *attr, char *buf)
 237 {
 238         struct vidi_context *ctx = dev_get_drvdata(dev);
 239         int rc;
 240
 241         mutex_lock(&ctx->lock);
 242
 243         rc = sprintf(buf, "%d\n", ctx->connected);
 244
 245         mutex_unlock(&ctx->lock);
 246
 247         return rc;
 248 }
 249
 250 static int vidi_store_connection(struct device *dev,
 251                                 struct device_attribute *attr,
 252                                 const char *buf, size_t len)
 253 {
 254         struct vidi_context *ctx = dev_get_drvdata(dev);
 255         int ret;
 256
 257         ret = kstrtoint(buf, 0, &ctx->connected);
 258         if (ret)
 259                 return ret;
 260
 261         if (ctx->connected > 1)
 262                 return -EINVAL;
 263
 264         /* use fake edid data for test. */
 265         if (!ctx->raw_edid)
 266                 ctx->raw_edid = (struct edid *)fake_edid_info;
 267
 268         /* if raw_edid isn't same as fake data then it can't be tested. */
 269         if (ctx->raw_edid != (struct edid *)fake_edid_info) {
 270                 DRM_DEBUG_KMS("edid data is not fake data.\n");
 271                 return -EINVAL;
 272         }
 273
 274         DRM_DEBUG_KMS("requested connection.\n");
 275
 276         drm_helper_hpd_irq_event(ctx->drm_dev);
 277
 278         return len;
 279 }
 280
 281 static DEVICE_ATTR(connection, 0644, vidi_show_connection,
 282                         vidi_store_connection);
 283
 284 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data,
 285                                 struct drm_file *file_priv)
 286 {
 287         struct vidi_context *ctx = NULL;
 288         struct drm_encoder *encoder;
 289         struct exynos_drm_display *display;
 290         struct drm_exynos_vidi_connection *vidi = data;
 291
 292         if (!vidi) {
 293                 DRM_DEBUG_KMS("user data for vidi is null.\n");
 294                 return -EINVAL;
 295         }
 296
 297         if (vidi->connection > 1) {
 298                 DRM_DEBUG_KMS("connection should be 0 or 1.\n");
 299                 return -EINVAL;
 300         }
 301
 302         list_for_each_entry(encoder, &drm_dev->mode_config.encoder_list,
 303                                                                 head) {
 304                 display = exynos_drm_get_display(encoder);
 305
 306                 if (display->type == EXYNOS_DISPLAY_TYPE_VIDI) {
 307                         ctx = display_to_vidi(display);
 308                         break;
 309                 }
 310         }
 311
 312         if (!ctx) {
 313                 DRM_DEBUG_KMS("not found virtual device type encoder.\n");
 314                 return -EINVAL;
 315         }
 316
 317         if (ctx->connected == vidi->connection) {
 318                 DRM_DEBUG_KMS("same connection request.\n");
 319                 return -EINVAL;
 320         }
 321
 322         if (vidi->connection) {
 323                 struct edid *raw_edid  = (struct edid *)(uint32_t)vidi->edid;
 324                 if (!drm_edid_is_valid(raw_edid)) {
 325                         DRM_DEBUG_KMS("edid data is invalid.\n");
 326                         return -EINVAL;
 327                 }
 328                 ctx->raw_edid = drm_edid_duplicate(raw_edid);
 329                 if (!ctx->raw_edid) {
 330                         DRM_DEBUG_KMS("failed to allocate raw_edid.\n");
 331                         return -ENOMEM;
 332                 }
 333         } else {
 334                 /*
 335                  * with connection = 0, free raw_edid
 336                  * only if raw edid data isn't same as fake data.
 337                  */
 338                 if (ctx->raw_edid && ctx->raw_edid !=
 339                                 (struct edid *)fake_edid_info) {
 340                         kfree(ctx->raw_edid);
 341                         ctx->raw_edid = NULL;
 342                 }
 343         }
 344
 345         ctx->connected = vidi->connection;
 346         drm_helper_hpd_irq_event(ctx->drm_dev);
 347
 348         return 0;
 349 }
 350
 351 static enum drm_connector_status vidi_detect(struct drm_connector *connector,
 352                         bool force)
 353 {
 354         struct vidi_context *ctx = ctx_from_connector(connector);
 355
 356         /*
 357          * connection request would come from user side
 358          * to do hotplug through specific ioctl.
 359          */
 360         return ctx->connected ? connector_status_connected :
 361                         connector_status_disconnected;
 362 }
 363
 364 static void vidi_connector_destroy(struct drm_connector *connector)
 365 {
 366 }
 367
 368 static struct drm_connector_funcs vidi_connector_funcs = {
 369         .dpms = drm_atomic_helper_connector_dpms,
 370         .fill_modes = drm_helper_probe_single_connector_modes,
 371         .detect = vidi_detect,
 372         .destroy = vidi_connector_destroy,
 373         .reset = drm_atomic_helper_connector_reset,
 374         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 375         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 376 };
 377
 378 static int vidi_get_modes(struct drm_connector *connector)
 379 {
 380         struct vidi_context *ctx = ctx_from_connector(connector);
 381         struct edid *edid;
 382         int edid_len;
 383
 384         /*
 385          * the edid data comes from user side and it would be set
 386          * to ctx->raw_edid through specific ioctl.
 387          */
 388         if (!ctx->raw_edid) {
 389                 DRM_DEBUG_KMS("raw_edid is null.\n");
 390                 return -EFAULT;
 391         }
 392
 393         edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH;
 394         edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL);
 395         if (!edid) {
 396                 DRM_DEBUG_KMS("failed to allocate edid\n");
 397                 return -ENOMEM;
 398         }
 399
 400         drm_mode_connector_update_edid_property(connector, edid);
 401
 402         return drm_add_edid_modes(connector, edid);
 403 }
 404
 405 static struct drm_encoder *vidi_best_encoder(struct drm_connector *connector)
 406 {
 407         struct vidi_context *ctx = ctx_from_connector(connector);
 408
 409         return ctx->encoder;
 410 }
 411
 412 static struct drm_connector_helper_funcs vidi_connector_helper_funcs = {
 413         .get_modes = vidi_get_modes,
 414         .best_encoder = vidi_best_encoder,
 415 };
 416
 417 static int vidi_create_connector(struct exynos_drm_display *display,
 418                                 struct drm_encoder *encoder)
 419 {
 420         struct vidi_context *ctx = display_to_vidi(display);
 421         struct drm_connector *connector = &ctx->connector;
 422         int ret;
 423
 424         ctx->encoder = encoder;
 425         connector->polled = DRM_CONNECTOR_POLL_HPD;
 426
 427         ret = drm_connector_init(ctx->drm_dev, connector,
 428                         &vidi_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
 429         if (ret) {
 430                 DRM_ERROR("Failed to initialize connector with drm\n");
 431                 return ret;
 432         }
 433
 434         drm_connector_helper_add(connector, &vidi_connector_helper_funcs);
 435         drm_connector_register(connector);
 436         drm_mode_connector_attach_encoder(connector, encoder);
 437
 438         return 0;
 439 }
 440
 441
 442 static struct exynos_drm_display_ops vidi_display_ops = {
 443         .create_connector = vidi_create_connector,
 444 };
 445
 446 static int vidi_bind(struct device *dev, struct device *master, void *data)
 447 {
 448         struct vidi_context *ctx = dev_get_drvdata(dev);
 449         struct drm_device *drm_dev = data;
 450         struct exynos_drm_plane *exynos_plane;
 451         enum drm_plane_type type;
 452         unsigned int zpos;
 453         int ret;
 454
 455         vidi_ctx_initialize(ctx, drm_dev);
 456
 457         for (zpos = 0; zpos < WINDOWS_NR; zpos++) {
 458                 type = (zpos == ctx->default_win) ? DRM_PLANE_TYPE_PRIMARY :
 459                                                 DRM_PLANE_TYPE_OVERLAY;
 460                 ret = exynos_plane_init(drm_dev, &ctx->planes[zpos],
 461                                         1 << ctx->pipe, type, zpos);
 462                 if (ret)
 463                         return ret;
 464         }
 465
 466         exynos_plane = &ctx->planes[ctx->default_win];
 467         ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base,
 468                                            ctx->pipe, EXYNOS_DISPLAY_TYPE_VIDI,
 469                                            &vidi_crtc_ops, ctx);
 470         if (IS_ERR(ctx->crtc)) {
 471                 DRM_ERROR("failed to create crtc.\n");
 472                 return PTR_ERR(ctx->crtc);
 473         }
 474
 475         ret = exynos_drm_create_enc_conn(drm_dev, &ctx->display);
 476         if (ret) {
 477                 ctx->crtc->base.funcs->destroy(&ctx->crtc->base);
 478                 return ret;
 479         }
 480
 481         return 0;
 482 }
 483
 484
 485 static void vidi_unbind(struct device *dev, struct device *master, void *data)
 486 {
 487 }
 488
 489 static const struct component_ops vidi_component_ops = {
 490         .bind   = vidi_bind,
 491         .unbind = vidi_unbind,
 492 };
 493
 494 static int vidi_probe(struct platform_device *pdev)
 495 {
 496         struct vidi_context *ctx;
 497         int ret;
 498
 499         ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
 500         if (!ctx)
 501                 return -ENOMEM;
 502
 503         ctx->display.type = EXYNOS_DISPLAY_TYPE_VIDI;
 504         ctx->display.ops = &vidi_display_ops;
 505         ctx->default_win = 0;
 506         ctx->pdev = pdev;
 507
 508         ret = exynos_drm_component_add(&pdev->dev, EXYNOS_DEVICE_TYPE_CRTC,
 509                                         EXYNOS_DISPLAY_TYPE_VIDI);
 510         if (ret)
 511                 return ret;
 512
 513         ret = exynos_drm_component_add(&pdev->dev, EXYNOS_DEVICE_TYPE_CONNECTOR,
 514                                         ctx->display.type);
 515         if (ret)
 516                 goto err_del_crtc_component;
 517
 518         INIT_WORK(&ctx->work, vidi_fake_vblank_handler);
 519
 520         mutex_init(&ctx->lock);
 521
 522         platform_set_drvdata(pdev, ctx);
 523
 524         ret = device_create_file(&pdev->dev, &dev_attr_connection);
 525         if (ret < 0) {
 526                 DRM_ERROR("failed to create connection sysfs.\n");
 527                 goto err_del_conn_component;
 528         }
 529
 530         ret = component_add(&pdev->dev, &vidi_component_ops);
 531         if (ret)
 532                 goto err_remove_file;
 533
 534         return ret;
 535
 536 err_remove_file:
 537         device_remove_file(&pdev->dev, &dev_attr_connection);
 538 err_del_conn_component:
 539         exynos_drm_component_del(&pdev->dev, EXYNOS_DEVICE_TYPE_CONNECTOR);
 540 err_del_crtc_component:
 541         exynos_drm_component_del(&pdev->dev, EXYNOS_DEVICE_TYPE_CRTC);
 542
 543         return ret;
 544 }
 545
 546 static int vidi_remove(struct platform_device *pdev)
 547 {
 548         struct vidi_context *ctx = platform_get_drvdata(pdev);
 549
 550         if (ctx->raw_edid != (struct edid *)fake_edid_info) {
 551                 kfree(ctx->raw_edid);
 552                 ctx->raw_edid = NULL;
 553
 554                 return -EINVAL;
 555         }
 556
 557         component_del(&pdev->dev, &vidi_component_ops);
 558         exynos_drm_component_del(&pdev->dev, EXYNOS_DEVICE_TYPE_CONNECTOR);
 559         exynos_drm_component_del(&pdev->dev, EXYNOS_DEVICE_TYPE_CRTC);
 560
 561         return 0;
 562 }
 563
 564 struct platform_driver vidi_driver = {
 565         .probe          = vidi_probe,
 566         .remove         = vidi_remove,
 567         .driver         = {
 568                 .name   = "exynos-drm-vidi",
 569                 .owner  = THIS_MODULE,
 570         },
 571 };