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_vidi.h"
  29
  30 /* vidi has totally three virtual windows. */
  31 #define WINDOWS_NR              3
  32 #define CURSOR_WIN              2
  33
  34 #define ctx_from_connector(c)   container_of(c, struct vidi_context, \
  35                                         connector)
  36
  37 struct vidi_context {
  38         struct drm_encoder              encoder;
  39         struct platform_device          *pdev;
  40         struct drm_device               *drm_dev;
  41         struct exynos_drm_crtc          *crtc;
  42         struct drm_connector            connector;
  43         struct exynos_drm_plane         planes[WINDOWS_NR];
  44         struct edid                     *raw_edid;
  45         unsigned int                    clkdiv;
  46         unsigned long                   irq_flags;
  47         unsigned int                    connected;
  48         bool                            vblank_on;
  49         bool                            suspended;
  50         bool                            direct_vblank;
  51         struct work_struct              work;
  52         struct mutex                    lock;
  53         int                             pipe;
  54 };
  55
  56 static inline struct vidi_context *encoder_to_vidi(struct drm_encoder *e)
  57 {
  58         return container_of(e, struct vidi_context, encoder);
  59 }
  60
  61 static const char fake_edid_info[] = {
  62         0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x4c, 0x2d, 0x05, 0x05,
  63         0x00, 0x00, 0x00, 0x00, 0x30, 0x12, 0x01, 0x03, 0x80, 0x10, 0x09, 0x78,
  64         0x0a, 0xee, 0x91, 0xa3, 0x54, 0x4c, 0x99, 0x26, 0x0f, 0x50, 0x54, 0xbd,
  65         0xee, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
  66         0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xb0, 0x51, 0x00,
  67         0x1b, 0x30, 0x40, 0x70, 0x36, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e,
  68         0x01, 0x1d, 0x00, 0x72, 0x51, 0xd0, 0x1e, 0x20, 0x6e, 0x28, 0x55, 0x00,
  69         0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18,
  70         0x4b, 0x1a, 0x44, 0x17, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
  71         0x00, 0x00, 0x00, 0xfc, 0x00, 0x53, 0x41, 0x4d, 0x53, 0x55, 0x4e, 0x47,
  72         0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0xbc, 0x02, 0x03, 0x1e, 0xf1,
  73         0x46, 0x84, 0x05, 0x03, 0x10, 0x20, 0x22, 0x23, 0x09, 0x07, 0x07, 0x83,
  74         0x01, 0x00, 0x00, 0xe2, 0x00, 0x0f, 0x67, 0x03, 0x0c, 0x00, 0x10, 0x00,
  75         0xb8, 0x2d, 0x01, 0x1d, 0x80, 0x18, 0x71, 0x1c, 0x16, 0x20, 0x58, 0x2c,
  76         0x25, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x9e, 0x8c, 0x0a, 0xd0, 0x8a,
  77         0x20, 0xe0, 0x2d, 0x10, 0x10, 0x3e, 0x96, 0x00, 0xa0, 0x5a, 0x00, 0x00,
  78         0x00, 0x18, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
  79         0x45, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0x00,
  80         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 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, 0x06
  84 };
  85
  86 static const uint32_t formats[] = {
  87         DRM_FORMAT_XRGB8888,
  88         DRM_FORMAT_ARGB8888,
  89         DRM_FORMAT_NV12,
  90 };
  91
  92 static int vidi_enable_vblank(struct exynos_drm_crtc *crtc)
  93 {
  94         struct vidi_context *ctx = crtc->ctx;
  95
  96         if (ctx->suspended)
  97                 return -EPERM;
  98
  99         if (!test_and_set_bit(0, &ctx->irq_flags))
 100                 ctx->vblank_on = true;
 101
 102         ctx->direct_vblank = true;
 103
 104         /*
 105          * in case of page flip request, vidi_finish_pageflip function
 106          * will not be called because direct_vblank is true and then
 107          * that function will be called by crtc_ops->update_plane callback
 108          */
 109         schedule_work(&ctx->work);
 110
 111         return 0;
 112 }
 113
 114 static void vidi_disable_vblank(struct exynos_drm_crtc *crtc)
 115 {
 116         struct vidi_context *ctx = crtc->ctx;
 117
 118         if (ctx->suspended)
 119                 return;
 120
 121         if (test_and_clear_bit(0, &ctx->irq_flags))
 122                 ctx->vblank_on = false;
 123 }
 124
 125 static void vidi_update_plane(struct exynos_drm_crtc *crtc,
 126                               struct exynos_drm_plane *plane)
 127 {
 128         struct vidi_context *ctx = crtc->ctx;
 129
 130         if (ctx->suspended)
 131                 return;
 132
 133         DRM_DEBUG_KMS("dma_addr = %pad\n", plane->dma_addr);
 134
 135         if (ctx->vblank_on)
 136                 schedule_work(&ctx->work);
 137 }
 138
 139 static void vidi_enable(struct exynos_drm_crtc *crtc)
 140 {
 141         struct vidi_context *ctx = crtc->ctx;
 142
 143         mutex_lock(&ctx->lock);
 144
 145         ctx->suspended = false;
 146
 147         /* if vblank was enabled status, enable it again. */
 148         if (test_and_clear_bit(0, &ctx->irq_flags))
 149                 vidi_enable_vblank(ctx->crtc);
 150
 151         mutex_unlock(&ctx->lock);
 152 }
 153
 154 static void vidi_disable(struct exynos_drm_crtc *crtc)
 155 {
 156         struct vidi_context *ctx = crtc->ctx;
 157
 158         mutex_lock(&ctx->lock);
 159
 160         ctx->suspended = true;
 161
 162         mutex_unlock(&ctx->lock);
 163 }
 164
 165 static int vidi_ctx_initialize(struct vidi_context *ctx,
 166                         struct drm_device *drm_dev)
 167 {
 168         struct exynos_drm_private *priv = drm_dev->dev_private;
 169
 170         ctx->drm_dev = drm_dev;
 171         ctx->pipe = priv->pipe++;
 172
 173         return 0;
 174 }
 175
 176 static const struct exynos_drm_crtc_ops vidi_crtc_ops = {
 177         .enable = vidi_enable,
 178         .disable = vidi_disable,
 179         .enable_vblank = vidi_enable_vblank,
 180         .disable_vblank = vidi_disable_vblank,
 181         .update_plane = vidi_update_plane,
 182 };
 183
 184 static void vidi_fake_vblank_handler(struct work_struct *work)
 185 {
 186         struct vidi_context *ctx = container_of(work, struct vidi_context,
 187                                         work);
 188         int win;
 189
 190         if (ctx->pipe < 0)
 191                 return;
 192
 193         /* refresh rate is about 50Hz. */
 194         usleep_range(16000, 20000);
 195
 196         mutex_lock(&ctx->lock);
 197
 198         if (ctx->direct_vblank) {
 199                 drm_crtc_handle_vblank(&ctx->crtc->base);
 200                 ctx->direct_vblank = false;
 201                 mutex_unlock(&ctx->lock);
 202                 return;
 203         }
 204
 205         mutex_unlock(&ctx->lock);
 206
 207         for (win = 0 ; win < WINDOWS_NR ; win++) {
 208                 struct exynos_drm_plane *plane = &ctx->planes[win];
 209
 210                 if (!plane->pending_fb)
 211                         continue;
 212
 213                 exynos_drm_crtc_finish_update(ctx->crtc, plane);
 214         }
 215 }
 216
 217 static int vidi_show_connection(struct device *dev,
 218                                 struct device_attribute *attr, char *buf)
 219 {
 220         struct vidi_context *ctx = dev_get_drvdata(dev);
 221         int rc;
 222
 223         mutex_lock(&ctx->lock);
 224
 225         rc = sprintf(buf, "%d\n", ctx->connected);
 226
 227         mutex_unlock(&ctx->lock);
 228
 229         return rc;
 230 }
 231
 232 static int vidi_store_connection(struct device *dev,
 233                                 struct device_attribute *attr,
 234                                 const char *buf, size_t len)
 235 {
 236         struct vidi_context *ctx = dev_get_drvdata(dev);
 237         int ret;
 238
 239         ret = kstrtoint(buf, 0, &ctx->connected);
 240         if (ret)
 241                 return ret;
 242
 243         if (ctx->connected > 1)
 244                 return -EINVAL;
 245
 246         /* use fake edid data for test. */
 247         if (!ctx->raw_edid)
 248                 ctx->raw_edid = (struct edid *)fake_edid_info;
 249
 250         /* if raw_edid isn't same as fake data then it can't be tested. */
 251         if (ctx->raw_edid != (struct edid *)fake_edid_info) {
 252                 DRM_DEBUG_KMS("edid data is not fake data.\n");
 253                 return -EINVAL;
 254         }
 255
 256         DRM_DEBUG_KMS("requested connection.\n");
 257
 258         drm_helper_hpd_irq_event(ctx->drm_dev);
 259
 260         return len;
 261 }
 262
 263 static DEVICE_ATTR(connection, 0644, vidi_show_connection,
 264                         vidi_store_connection);
 265
 266 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data,
 267                                 struct drm_file *file_priv)
 268 {
 269         struct vidi_context *ctx = dev_get_drvdata(drm_dev->dev);
 270         struct drm_exynos_vidi_connection *vidi = data;
 271
 272         if (!vidi) {
 273                 DRM_DEBUG_KMS("user data for vidi is null.\n");
 274                 return -EINVAL;
 275         }
 276
 277         if (vidi->connection > 1) {
 278                 DRM_DEBUG_KMS("connection should be 0 or 1.\n");
 279                 return -EINVAL;
 280         }
 281
 282         if (ctx->connected == vidi->connection) {
 283                 DRM_DEBUG_KMS("same connection request.\n");
 284                 return -EINVAL;
 285         }
 286
 287         if (vidi->connection) {
 288                 struct edid *raw_edid  = (struct edid *)(uint32_t)vidi->edid;
 289                 if (!drm_edid_is_valid(raw_edid)) {
 290                         DRM_DEBUG_KMS("edid data is invalid.\n");
 291                         return -EINVAL;
 292                 }
 293                 ctx->raw_edid = drm_edid_duplicate(raw_edid);
 294                 if (!ctx->raw_edid) {
 295                         DRM_DEBUG_KMS("failed to allocate raw_edid.\n");
 296                         return -ENOMEM;
 297                 }
 298         } else {
 299                 /*
 300                  * with connection = 0, free raw_edid
 301                  * only if raw edid data isn't same as fake data.
 302                  */
 303                 if (ctx->raw_edid && ctx->raw_edid !=
 304                                 (struct edid *)fake_edid_info) {
 305                         kfree(ctx->raw_edid);
 306                         ctx->raw_edid = NULL;
 307                 }
 308         }
 309
 310         ctx->connected = vidi->connection;
 311         drm_helper_hpd_irq_event(ctx->drm_dev);
 312
 313         return 0;
 314 }
 315
 316 static enum drm_connector_status vidi_detect(struct drm_connector *connector,
 317                         bool force)
 318 {
 319         struct vidi_context *ctx = ctx_from_connector(connector);
 320
 321         /*
 322          * connection request would come from user side
 323          * to do hotplug through specific ioctl.
 324          */
 325         return ctx->connected ? connector_status_connected :
 326                         connector_status_disconnected;
 327 }
 328
 329 static void vidi_connector_destroy(struct drm_connector *connector)
 330 {
 331 }
 332
 333 static struct drm_connector_funcs vidi_connector_funcs = {
 334         .dpms = drm_atomic_helper_connector_dpms,
 335         .fill_modes = drm_helper_probe_single_connector_modes,
 336         .detect = vidi_detect,
 337         .destroy = vidi_connector_destroy,
 338         .reset = drm_atomic_helper_connector_reset,
 339         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 340         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 341 };
 342
 343 static int vidi_get_modes(struct drm_connector *connector)
 344 {
 345         struct vidi_context *ctx = ctx_from_connector(connector);
 346         struct edid *edid;
 347         int edid_len;
 348
 349         /*
 350          * the edid data comes from user side and it would be set
 351          * to ctx->raw_edid through specific ioctl.
 352          */
 353         if (!ctx->raw_edid) {
 354                 DRM_DEBUG_KMS("raw_edid is null.\n");
 355                 return -EFAULT;
 356         }
 357
 358         edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH;
 359         edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL);
 360         if (!edid) {
 361                 DRM_DEBUG_KMS("failed to allocate edid\n");
 362                 return -ENOMEM;
 363         }
 364
 365         drm_mode_connector_update_edid_property(connector, edid);
 366
 367         return drm_add_edid_modes(connector, edid);
 368 }
 369
 370 static struct drm_encoder *vidi_best_encoder(struct drm_connector *connector)
 371 {
 372         struct vidi_context *ctx = ctx_from_connector(connector);
 373
 374         return &ctx->encoder;
 375 }
 376
 377 static struct drm_connector_helper_funcs vidi_connector_helper_funcs = {
 378         .get_modes = vidi_get_modes,
 379         .best_encoder = vidi_best_encoder,
 380 };
 381
 382 static int vidi_create_connector(struct drm_encoder *encoder)
 383 {
 384         struct vidi_context *ctx = encoder_to_vidi(encoder);
 385         struct drm_connector *connector = &ctx->connector;
 386         int ret;
 387
 388         connector->polled = DRM_CONNECTOR_POLL_HPD;
 389
 390         ret = drm_connector_init(ctx->drm_dev, connector,
 391                         &vidi_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
 392         if (ret) {
 393                 DRM_ERROR("Failed to initialize connector with drm\n");
 394                 return ret;
 395         }
 396
 397         drm_connector_helper_add(connector, &vidi_connector_helper_funcs);
 398         drm_connector_register(connector);
 399         drm_mode_connector_attach_encoder(connector, encoder);
 400
 401         return 0;
 402 }
 403
 404 static bool exynos_vidi_mode_fixup(struct drm_encoder *encoder,
 405                                  const struct drm_display_mode *mode,
 406                                  struct drm_display_mode *adjusted_mode)
 407 {
 408         return true;
 409 }
 410
 411 static void exynos_vidi_mode_set(struct drm_encoder *encoder,
 412                                struct drm_display_mode *mode,
 413                                struct drm_display_mode *adjusted_mode)
 414 {
 415 }
 416
 417 static void exynos_vidi_enable(struct drm_encoder *encoder)
 418 {
 419 }
 420
 421 static void exynos_vidi_disable(struct drm_encoder *encoder)
 422 {
 423 }
 424
 425 static struct drm_encoder_helper_funcs exynos_vidi_encoder_helper_funcs = {
 426         .mode_fixup = exynos_vidi_mode_fixup,
 427         .mode_set = exynos_vidi_mode_set,
 428         .enable = exynos_vidi_enable,
 429         .disable = exynos_vidi_disable,
 430 };
 431
 432 static struct drm_encoder_funcs exynos_vidi_encoder_funcs = {
 433         .destroy = drm_encoder_cleanup,
 434 };
 435
 436 static int vidi_bind(struct device *dev, struct device *master, void *data)
 437 {
 438         struct vidi_context *ctx = dev_get_drvdata(dev);
 439         struct drm_device *drm_dev = data;
 440         struct drm_encoder *encoder = &ctx->encoder;
 441         struct exynos_drm_plane *exynos_plane;
 442         enum drm_plane_type type;
 443         unsigned int zpos;
 444         int pipe, ret;
 445
 446         vidi_ctx_initialize(ctx, drm_dev);
 447
 448         for (zpos = 0; zpos < WINDOWS_NR; zpos++) {
 449                 type = exynos_plane_get_type(zpos, CURSOR_WIN);
 450                 ret = exynos_plane_init(drm_dev, &ctx->planes[zpos],
 451                                         1 << ctx->pipe, type, formats,
 452                                         ARRAY_SIZE(formats), zpos);
 453                 if (ret)
 454                         return ret;
 455         }
 456
 457         exynos_plane = &ctx->planes[DEFAULT_WIN];
 458         ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base,
 459                                            ctx->pipe, EXYNOS_DISPLAY_TYPE_VIDI,
 460                                            &vidi_crtc_ops, ctx);
 461         if (IS_ERR(ctx->crtc)) {
 462                 DRM_ERROR("failed to create crtc.\n");
 463                 return PTR_ERR(ctx->crtc);
 464         }
 465
 466         pipe = exynos_drm_crtc_get_pipe_from_type(drm_dev,
 467                                                   EXYNOS_DISPLAY_TYPE_VIDI);
 468         if (pipe < 0)
 469                 return pipe;
 470
 471         encoder->possible_crtcs = 1 << pipe;
 472
 473         DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
 474
 475         drm_encoder_init(drm_dev, encoder, &exynos_vidi_encoder_funcs,
 476                          DRM_MODE_ENCODER_TMDS, NULL);
 477
 478         drm_encoder_helper_add(encoder, &exynos_vidi_encoder_helper_funcs);
 479
 480         ret = vidi_create_connector(encoder);
 481         if (ret) {
 482                 DRM_ERROR("failed to create connector ret = %d\n", ret);
 483                 drm_encoder_cleanup(encoder);
 484                 return ret;
 485         }
 486
 487         return 0;
 488 }
 489
 490
 491 static void vidi_unbind(struct device *dev, struct device *master, void *data)
 492 {
 493 }
 494
 495 static const struct component_ops vidi_component_ops = {
 496         .bind   = vidi_bind,
 497         .unbind = vidi_unbind,
 498 };
 499
 500 static int vidi_probe(struct platform_device *pdev)
 501 {
 502         struct vidi_context *ctx;
 503         int ret;
 504
 505         ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
 506         if (!ctx)
 507                 return -ENOMEM;
 508
 509         ctx->pdev = pdev;
 510
 511         INIT_WORK(&ctx->work, vidi_fake_vblank_handler);
 512
 513         mutex_init(&ctx->lock);
 514
 515         platform_set_drvdata(pdev, ctx);
 516
 517         ret = device_create_file(&pdev->dev, &dev_attr_connection);
 518         if (ret < 0) {
 519                 DRM_ERROR("failed to create connection sysfs.\n");
 520                 return ret;
 521         }
 522
 523         ret = component_add(&pdev->dev, &vidi_component_ops);
 524         if (ret)
 525                 goto err_remove_file;
 526
 527         return ret;
 528
 529 err_remove_file:
 530         device_remove_file(&pdev->dev, &dev_attr_connection);
 531
 532         return ret;
 533 }
 534
 535 static int vidi_remove(struct platform_device *pdev)
 536 {
 537         struct vidi_context *ctx = platform_get_drvdata(pdev);
 538
 539         if (ctx->raw_edid != (struct edid *)fake_edid_info) {
 540                 kfree(ctx->raw_edid);
 541                 ctx->raw_edid = NULL;
 542
 543                 return -EINVAL;
 544         }
 545
 546         component_del(&pdev->dev, &vidi_component_ops);
 547
 548         return 0;
 549 }
 550
 551 struct platform_driver vidi_driver = {
 552         .probe          = vidi_probe,
 553         .remove         = vidi_remove,
 554         .driver         = {
 555                 .name   = "exynos-drm-vidi",
 556                 .owner  = THIS_MODULE,
 557         },
 558 };