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