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_fb.h"
  28 #include "exynos_drm_plane.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 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 const enum drm_plane_type vidi_win_types[WINDOWS_NR] = {
  93         DRM_PLANE_TYPE_PRIMARY,
  94         DRM_PLANE_TYPE_OVERLAY,
  95         DRM_PLANE_TYPE_CURSOR,
  96 };
  97
  98 static int vidi_enable_vblank(struct exynos_drm_crtc *crtc)
  99 {
 100         struct vidi_context *ctx = crtc->ctx;
 101
 102         if (ctx->suspended)
 103                 return -EPERM;
 104
 105         if (!test_and_set_bit(0, &ctx->irq_flags))
 106                 ctx->vblank_on = true;
 107
 108         ctx->direct_vblank = true;
 109
 110         /*
 111          * in case of page flip request, vidi_finish_pageflip function
 112          * will not be called because direct_vblank is true and then
 113          * that function will be called by crtc_ops->update_plane callback
 114          */
 115         schedule_work(&ctx->work);
 116
 117         return 0;
 118 }
 119
 120 static void vidi_disable_vblank(struct exynos_drm_crtc *crtc)
 121 {
 122         struct vidi_context *ctx = crtc->ctx;
 123
 124         if (ctx->suspended)
 125                 return;
 126
 127         if (test_and_clear_bit(0, &ctx->irq_flags))
 128                 ctx->vblank_on = false;
 129 }
 130
 131 static void vidi_update_plane(struct exynos_drm_crtc *crtc,
 132                               struct exynos_drm_plane *plane)
 133 {
 134         struct drm_plane_state *state = plane->base.state;
 135         struct vidi_context *ctx = crtc->ctx;
 136         dma_addr_t addr;
 137
 138         if (ctx->suspended)
 139                 return;
 140
 141         addr = exynos_drm_fb_dma_addr(state->fb, 0);
 142         DRM_DEBUG_KMS("dma_addr = %pad\n", &addr);
 143
 144         if (ctx->vblank_on)
 145                 schedule_work(&ctx->work);
 146 }
 147
 148 static void vidi_enable(struct exynos_drm_crtc *crtc)
 149 {
 150         struct vidi_context *ctx = crtc->ctx;
 151
 152         mutex_lock(&ctx->lock);
 153
 154         ctx->suspended = false;
 155
 156         /* if vblank was enabled status, enable it again. */
 157         if (test_and_clear_bit(0, &ctx->irq_flags))
 158                 vidi_enable_vblank(ctx->crtc);
 159
 160         mutex_unlock(&ctx->lock);
 161 }
 162
 163 static void vidi_disable(struct exynos_drm_crtc *crtc)
 164 {
 165         struct vidi_context *ctx = crtc->ctx;
 166
 167         mutex_lock(&ctx->lock);
 168
 169         ctx->suspended = true;
 170
 171         mutex_unlock(&ctx->lock);
 172 }
 173
 174 static int vidi_ctx_initialize(struct vidi_context *ctx,
 175                         struct drm_device *drm_dev)
 176 {
 177         struct exynos_drm_private *priv = drm_dev->dev_private;
 178
 179         ctx->drm_dev = drm_dev;
 180         ctx->pipe = priv->pipe++;
 181
 182         return 0;
 183 }
 184
 185 static const struct exynos_drm_crtc_ops vidi_crtc_ops = {
 186         .enable = vidi_enable,
 187         .disable = vidi_disable,
 188         .enable_vblank = vidi_enable_vblank,
 189         .disable_vblank = vidi_disable_vblank,
 190         .update_plane = vidi_update_plane,
 191 };
 192
 193 static void vidi_fake_vblank_handler(struct work_struct *work)
 194 {
 195         struct vidi_context *ctx = container_of(work, struct vidi_context,
 196                                         work);
 197         int win;
 198
 199         if (ctx->pipe < 0)
 200                 return;
 201
 202         /* refresh rate is about 50Hz. */
 203         usleep_range(16000, 20000);
 204
 205         mutex_lock(&ctx->lock);
 206
 207         if (ctx->direct_vblank) {
 208                 drm_crtc_handle_vblank(&ctx->crtc->base);
 209                 ctx->direct_vblank = false;
 210                 mutex_unlock(&ctx->lock);
 211                 return;
 212         }
 213
 214         mutex_unlock(&ctx->lock);
 215
 216         for (win = 0 ; win < WINDOWS_NR ; win++) {
 217                 struct exynos_drm_plane *plane = &ctx->planes[win];
 218
 219                 if (!plane->pending_fb)
 220                         continue;
 221
 222                 exynos_drm_crtc_finish_update(ctx->crtc, plane);
 223         }
 224 }
 225
 226 static ssize_t vidi_show_connection(struct device *dev,
 227                                 struct device_attribute *attr, char *buf)
 228 {
 229         struct vidi_context *ctx = dev_get_drvdata(dev);
 230         int rc;
 231
 232         mutex_lock(&ctx->lock);
 233
 234         rc = sprintf(buf, "%d\n", ctx->connected);
 235
 236         mutex_unlock(&ctx->lock);
 237
 238         return rc;
 239 }
 240
 241 static ssize_t vidi_store_connection(struct device *dev,
 242                                 struct device_attribute *attr,
 243                                 const char *buf, size_t len)
 244 {
 245         struct vidi_context *ctx = dev_get_drvdata(dev);
 246         int ret;
 247
 248         ret = kstrtoint(buf, 0, &ctx->connected);
 249         if (ret)
 250                 return ret;
 251
 252         if (ctx->connected > 1)
 253                 return -EINVAL;
 254
 255         /* use fake edid data for test. */
 256         if (!ctx->raw_edid)
 257                 ctx->raw_edid = (struct edid *)fake_edid_info;
 258
 259         /* if raw_edid isn't same as fake data then it can't be tested. */
 260         if (ctx->raw_edid != (struct edid *)fake_edid_info) {
 261                 DRM_DEBUG_KMS("edid data is not fake data.\n");
 262                 return -EINVAL;
 263         }
 264
 265         DRM_DEBUG_KMS("requested connection.\n");
 266
 267         drm_helper_hpd_irq_event(ctx->drm_dev);
 268
 269         return len;
 270 }
 271
 272 static DEVICE_ATTR(connection, 0644, vidi_show_connection,
 273                         vidi_store_connection);
 274
 275 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data,
 276                                 struct drm_file *file_priv)
 277 {
 278         struct vidi_context *ctx = dev_get_drvdata(drm_dev->dev);
 279         struct drm_exynos_vidi_connection *vidi = data;
 280
 281         if (!vidi) {
 282                 DRM_DEBUG_KMS("user data for vidi is null.\n");
 283                 return -EINVAL;
 284         }
 285
 286         if (vidi->connection > 1) {
 287                 DRM_DEBUG_KMS("connection should be 0 or 1.\n");
 288                 return -EINVAL;
 289         }
 290
 291         if (ctx->connected == vidi->connection) {
 292                 DRM_DEBUG_KMS("same connection request.\n");
 293                 return -EINVAL;
 294         }
 295
 296         if (vidi->connection) {
 297                 struct edid *raw_edid;
 298
 299                 raw_edid = (struct edid *)(unsigned long)vidi->edid;
 300                 if (!drm_edid_is_valid(raw_edid)) {
 301                         DRM_DEBUG_KMS("edid data is invalid.\n");
 302                         return -EINVAL;
 303                 }
 304                 ctx->raw_edid = drm_edid_duplicate(raw_edid);
 305                 if (!ctx->raw_edid) {
 306                         DRM_DEBUG_KMS("failed to allocate raw_edid.\n");
 307                         return -ENOMEM;
 308                 }
 309         } else {
 310                 /*
 311                  * with connection = 0, free raw_edid
 312                  * only if raw edid data isn't same as fake data.
 313                  */
 314                 if (ctx->raw_edid && ctx->raw_edid !=
 315                                 (struct edid *)fake_edid_info) {
 316                         kfree(ctx->raw_edid);
 317                         ctx->raw_edid = NULL;
 318                 }
 319         }
 320
 321         ctx->connected = vidi->connection;
 322         drm_helper_hpd_irq_event(ctx->drm_dev);
 323
 324         return 0;
 325 }
 326
 327 static enum drm_connector_status vidi_detect(struct drm_connector *connector,
 328                         bool force)
 329 {
 330         struct vidi_context *ctx = ctx_from_connector(connector);
 331
 332         /*
 333          * connection request would come from user side
 334          * to do hotplug through specific ioctl.
 335          */
 336         return ctx->connected ? connector_status_connected :
 337                         connector_status_disconnected;
 338 }
 339
 340 static void vidi_connector_destroy(struct drm_connector *connector)
 341 {
 342 }
 343
 344 static const struct drm_connector_funcs vidi_connector_funcs = {
 345         .dpms = drm_atomic_helper_connector_dpms,
 346         .fill_modes = drm_helper_probe_single_connector_modes,
 347         .detect = vidi_detect,
 348         .destroy = vidi_connector_destroy,
 349         .reset = drm_atomic_helper_connector_reset,
 350         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 351         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 352 };
 353
 354 static int vidi_get_modes(struct drm_connector *connector)
 355 {
 356         struct vidi_context *ctx = ctx_from_connector(connector);
 357         struct edid *edid;
 358         int edid_len;
 359
 360         /*
 361          * the edid data comes from user side and it would be set
 362          * to ctx->raw_edid through specific ioctl.
 363          */
 364         if (!ctx->raw_edid) {
 365                 DRM_DEBUG_KMS("raw_edid is null.\n");
 366                 return -EFAULT;
 367         }
 368
 369         edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH;
 370         edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL);
 371         if (!edid) {
 372                 DRM_DEBUG_KMS("failed to allocate edid\n");
 373                 return -ENOMEM;
 374         }
 375
 376         drm_mode_connector_update_edid_property(connector, edid);
 377
 378         return drm_add_edid_modes(connector, edid);
 379 }
 380
 381 static struct drm_encoder *vidi_best_encoder(struct drm_connector *connector)
 382 {
 383         struct vidi_context *ctx = ctx_from_connector(connector);
 384
 385         return &ctx->encoder;
 386 }
 387
 388 static const struct drm_connector_helper_funcs vidi_connector_helper_funcs = {
 389         .get_modes = vidi_get_modes,
 390         .best_encoder = vidi_best_encoder,
 391 };
 392
 393 static int vidi_create_connector(struct drm_encoder *encoder)
 394 {
 395         struct vidi_context *ctx = encoder_to_vidi(encoder);
 396         struct drm_connector *connector = &ctx->connector;
 397         int ret;
 398
 399         connector->polled = DRM_CONNECTOR_POLL_HPD;
 400
 401         ret = drm_connector_init(ctx->drm_dev, connector,
 402                         &vidi_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
 403         if (ret) {
 404                 DRM_ERROR("Failed to initialize connector with drm\n");
 405                 return ret;
 406         }
 407
 408         drm_connector_helper_add(connector, &vidi_connector_helper_funcs);
 409         drm_connector_register(connector);
 410         drm_mode_connector_attach_encoder(connector, encoder);
 411
 412         return 0;
 413 }
 414
 415 static void exynos_vidi_mode_set(struct drm_encoder *encoder,
 416                                struct drm_display_mode *mode,
 417                                struct drm_display_mode *adjusted_mode)
 418 {
 419 }
 420
 421 static void exynos_vidi_enable(struct drm_encoder *encoder)
 422 {
 423 }
 424
 425 static void exynos_vidi_disable(struct drm_encoder *encoder)
 426 {
 427 }
 428
 429 static const struct drm_encoder_helper_funcs exynos_vidi_encoder_helper_funcs = {
 430         .mode_set = exynos_vidi_mode_set,
 431         .enable = exynos_vidi_enable,
 432         .disable = exynos_vidi_disable,
 433 };
 434
 435 static const struct drm_encoder_funcs exynos_vidi_encoder_funcs = {
 436         .destroy = drm_encoder_cleanup,
 437 };
 438
 439 static int vidi_bind(struct device *dev, struct device *master, void *data)
 440 {
 441         struct vidi_context *ctx = dev_get_drvdata(dev);
 442         struct drm_device *drm_dev = data;
 443         struct drm_encoder *encoder = &ctx->encoder;
 444         struct exynos_drm_plane *exynos_plane;
 445         struct exynos_drm_plane_config plane_config = { 0 };
 446         unsigned int i;
 447         int pipe, ret;
 448
 449         vidi_ctx_initialize(ctx, drm_dev);
 450
 451         plane_config.pixel_formats = formats;
 452         plane_config.num_pixel_formats = ARRAY_SIZE(formats);
 453
 454         for (i = 0; i < WINDOWS_NR; i++) {
 455                 plane_config.zpos = i;
 456                 plane_config.type = vidi_win_types[i];
 457
 458                 ret = exynos_plane_init(drm_dev, &ctx->planes[i], i,
 459                                         1 << ctx->pipe, &plane_config);
 460                 if (ret)
 461                         return ret;
 462         }
 463
 464         exynos_plane = &ctx->planes[DEFAULT_WIN];
 465         ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base,
 466                                            ctx->pipe, EXYNOS_DISPLAY_TYPE_VIDI,
 467                                            &vidi_crtc_ops, ctx);
 468         if (IS_ERR(ctx->crtc)) {
 469                 DRM_ERROR("failed to create crtc.\n");
 470                 return PTR_ERR(ctx->crtc);
 471         }
 472
 473         pipe = exynos_drm_crtc_get_pipe_from_type(drm_dev,
 474                                                   EXYNOS_DISPLAY_TYPE_VIDI);
 475         if (pipe < 0)
 476                 return pipe;
 477
 478         encoder->possible_crtcs = 1 << pipe;
 479
 480         DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
 481
 482         drm_encoder_init(drm_dev, encoder, &exynos_vidi_encoder_funcs,
 483                          DRM_MODE_ENCODER_TMDS, NULL);
 484
 485         drm_encoder_helper_add(encoder, &exynos_vidi_encoder_helper_funcs);
 486
 487         ret = vidi_create_connector(encoder);
 488         if (ret) {
 489                 DRM_ERROR("failed to create connector ret = %d\n", ret);
 490                 drm_encoder_cleanup(encoder);
 491                 return ret;
 492         }
 493
 494         return 0;
 495 }
 496
 497
 498 static void vidi_unbind(struct device *dev, struct device *master, void *data)
 499 {
 500 }
 501
 502 static const struct component_ops vidi_component_ops = {
 503         .bind   = vidi_bind,
 504         .unbind = vidi_unbind,
 505 };
 506
 507 static int vidi_probe(struct platform_device *pdev)
 508 {
 509         struct vidi_context *ctx;
 510         int ret;
 511
 512         ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
 513         if (!ctx)
 514                 return -ENOMEM;
 515
 516         ctx->pdev = pdev;
 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                 return ret;
 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
 539         return ret;
 540 }
 541
 542 static int vidi_remove(struct platform_device *pdev)
 543 {
 544         struct vidi_context *ctx = platform_get_drvdata(pdev);
 545
 546         if (ctx->raw_edid != (struct edid *)fake_edid_info) {
 547                 kfree(ctx->raw_edid);
 548                 ctx->raw_edid = NULL;
 549
 550                 return -EINVAL;
 551         }
 552
 553         component_del(&pdev->dev, &vidi_component_ops);
 554
 555         return 0;
 556 }
 557
 558 struct platform_driver vidi_driver = {
 559         .probe          = vidi_probe,
 560         .remove         = vidi_remove,
 561         .driver         = {
 562                 .name   = "exynos-drm-vidi",
 563                 .owner  = THIS_MODULE,
 564         },
 565 };