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_context(dev)   platform_get_drvdata(to_platform_device(dev))
  32
  33 struct vidi_win_data {
  34         unsigned int            offset_x;
  35         unsigned int            offset_y;
  36         unsigned int            ovl_width;
  37         unsigned int            ovl_height;
  38         unsigned int            fb_width;
  39         unsigned int            fb_height;
  40         unsigned int            bpp;
  41         dma_addr_t              dma_addr;
  42         unsigned int            buf_offsize;
  43         unsigned int            line_size;      /* bytes */
  44         bool                    enabled;
  45 };
  46
  47 struct vidi_context {
  48         struct exynos_drm_subdrv        subdrv;
  49         struct drm_crtc                 *crtc;
  50         struct vidi_win_data            win_data[WINDOWS_NR];
  51         struct edid                     *raw_edid;
  52         unsigned int                    clkdiv;
  53         unsigned int                    default_win;
  54         unsigned long                   irq_flags;
  55         unsigned int                    connected;
  56         bool                            vblank_on;
  57         bool                            suspended;
  58         bool                            direct_vblank;
  59         struct work_struct              work;
  60         struct mutex                    lock;
  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 bool vidi_display_is_connected(struct device *dev)
  89 {
  90         struct vidi_context *ctx = get_vidi_context(dev);
  91
  92         /*
  93          * connection request would come from user side
  94          * to do hotplug through specific ioctl.
  95          */
  96         return ctx->connected ? true : false;
  97 }
  98
  99 static struct edid *vidi_get_edid(struct device *dev,
 100                         struct drm_connector *connector)
 101 {
 102         struct vidi_context *ctx = get_vidi_context(dev);
 103         struct edid *edid;
 104         int edid_len;
 105
 106         /*
 107          * the edid data comes from user side and it would be set
 108          * to ctx->raw_edid through specific ioctl.
 109          */
 110         if (!ctx->raw_edid) {
 111                 DRM_DEBUG_KMS("raw_edid is null.\n");
 112                 return ERR_PTR(-EFAULT);
 113         }
 114
 115         edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH;
 116         edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL);
 117         if (!edid) {
 118                 DRM_DEBUG_KMS("failed to allocate edid\n");
 119                 return ERR_PTR(-ENOMEM);
 120         }
 121
 122         return edid;
 123 }
 124
 125 static void *vidi_get_panel(struct device *dev)
 126 {
 127         /* TODO. */
 128
 129         return NULL;
 130 }
 131
 132 static int vidi_check_mode(struct device *dev, struct drm_display_mode *mode)
 133 {
 134         /* TODO. */
 135
 136         return 0;
 137 }
 138
 139 static int vidi_display_power_on(struct device *dev, int mode)
 140 {
 141         /* TODO */
 142
 143         return 0;
 144 }
 145
 146 static struct exynos_drm_display_ops vidi_display_ops = {
 147         .type = EXYNOS_DISPLAY_TYPE_VIDI,
 148         .is_connected = vidi_display_is_connected,
 149         .get_edid = vidi_get_edid,
 150         .get_panel = vidi_get_panel,
 151         .check_mode = vidi_check_mode,
 152         .power_on = vidi_display_power_on,
 153 };
 154
 155 static void vidi_dpms(struct device *subdrv_dev, int mode)
 156 {
 157         struct vidi_context *ctx = get_vidi_context(subdrv_dev);
 158
 159         DRM_DEBUG_KMS("%d\n", mode);
 160
 161         mutex_lock(&ctx->lock);
 162
 163         switch (mode) {
 164         case DRM_MODE_DPMS_ON:
 165                 /* TODO. */
 166                 break;
 167         case DRM_MODE_DPMS_STANDBY:
 168         case DRM_MODE_DPMS_SUSPEND:
 169         case DRM_MODE_DPMS_OFF:
 170                 /* TODO. */
 171                 break;
 172         default:
 173                 DRM_DEBUG_KMS("unspecified mode %d\n", mode);
 174                 break;
 175         }
 176
 177         mutex_unlock(&ctx->lock);
 178 }
 179
 180 static void vidi_apply(struct device *subdrv_dev)
 181 {
 182         struct vidi_context *ctx = get_vidi_context(subdrv_dev);
 183         struct exynos_drm_manager *mgr = ctx->subdrv.manager;
 184         struct exynos_drm_manager_ops *mgr_ops = mgr->ops;
 185         struct exynos_drm_overlay_ops *ovl_ops = mgr->overlay_ops;
 186         struct vidi_win_data *win_data;
 187         int i;
 188
 189         for (i = 0; i < WINDOWS_NR; i++) {
 190                 win_data = &ctx->win_data[i];
 191                 if (win_data->enabled && (ovl_ops && ovl_ops->commit))
 192                         ovl_ops->commit(subdrv_dev, i);
 193         }
 194
 195         if (mgr_ops && mgr_ops->commit)
 196                 mgr_ops->commit(subdrv_dev);
 197 }
 198
 199 static void vidi_commit(struct device *dev)
 200 {
 201         struct vidi_context *ctx = get_vidi_context(dev);
 202
 203         if (ctx->suspended)
 204                 return;
 205 }
 206
 207 static int vidi_enable_vblank(struct device *dev)
 208 {
 209         struct vidi_context *ctx = get_vidi_context(dev);
 210
 211         if (ctx->suspended)
 212                 return -EPERM;
 213
 214         if (!test_and_set_bit(0, &ctx->irq_flags))
 215                 ctx->vblank_on = true;
 216
 217         ctx->direct_vblank = true;
 218
 219         /*
 220          * in case of page flip request, vidi_finish_pageflip function
 221          * will not be called because direct_vblank is true and then
 222          * that function will be called by overlay_ops->commit callback
 223          */
 224         schedule_work(&ctx->work);
 225
 226         return 0;
 227 }
 228
 229 static void vidi_disable_vblank(struct device *dev)
 230 {
 231         struct vidi_context *ctx = get_vidi_context(dev);
 232
 233         if (ctx->suspended)
 234                 return;
 235
 236         if (test_and_clear_bit(0, &ctx->irq_flags))
 237                 ctx->vblank_on = false;
 238 }
 239
 240 static struct exynos_drm_manager_ops vidi_manager_ops = {
 241         .dpms = vidi_dpms,
 242         .apply = vidi_apply,
 243         .commit = vidi_commit,
 244         .enable_vblank = vidi_enable_vblank,
 245         .disable_vblank = vidi_disable_vblank,
 246 };
 247
 248 static void vidi_win_mode_set(struct device *dev,
 249                               struct exynos_drm_overlay *overlay)
 250 {
 251         struct vidi_context *ctx = get_vidi_context(dev);
 252         struct vidi_win_data *win_data;
 253         int win;
 254         unsigned long offset;
 255
 256         if (!overlay) {
 257                 dev_err(dev, "overlay is NULL\n");
 258                 return;
 259         }
 260
 261         win = overlay->zpos;
 262         if (win == DEFAULT_ZPOS)
 263                 win = ctx->default_win;
 264
 265         if (win < 0 || win >= WINDOWS_NR)
 266                 return;
 267
 268         offset = overlay->fb_x * (overlay->bpp >> 3);
 269         offset += overlay->fb_y * overlay->pitch;
 270
 271         DRM_DEBUG_KMS("offset = 0x%lx, pitch = %x\n", offset, overlay->pitch);
 272
 273         win_data = &ctx->win_data[win];
 274
 275         win_data->offset_x = overlay->crtc_x;
 276         win_data->offset_y = overlay->crtc_y;
 277         win_data->ovl_width = overlay->crtc_width;
 278         win_data->ovl_height = overlay->crtc_height;
 279         win_data->fb_width = overlay->fb_width;
 280         win_data->fb_height = overlay->fb_height;
 281         win_data->dma_addr = overlay->dma_addr[0] + offset;
 282         win_data->bpp = overlay->bpp;
 283         win_data->buf_offsize = (overlay->fb_width - overlay->crtc_width) *
 284                                 (overlay->bpp >> 3);
 285         win_data->line_size = overlay->crtc_width * (overlay->bpp >> 3);
 286
 287         /*
 288          * some parts of win_data should be transferred to user side
 289          * through specific ioctl.
 290          */
 291
 292         DRM_DEBUG_KMS("offset_x = %d, offset_y = %d\n",
 293                         win_data->offset_x, win_data->offset_y);
 294         DRM_DEBUG_KMS("ovl_width = %d, ovl_height = %d\n",
 295                         win_data->ovl_width, win_data->ovl_height);
 296         DRM_DEBUG_KMS("paddr = 0x%lx\n", (unsigned long)win_data->dma_addr);
 297         DRM_DEBUG_KMS("fb_width = %d, crtc_width = %d\n",
 298                         overlay->fb_width, overlay->crtc_width);
 299 }
 300
 301 static void vidi_win_commit(struct device *dev, int zpos)
 302 {
 303         struct vidi_context *ctx = get_vidi_context(dev);
 304         struct vidi_win_data *win_data;
 305         int win = zpos;
 306
 307         if (ctx->suspended)
 308                 return;
 309
 310         if (win == DEFAULT_ZPOS)
 311                 win = ctx->default_win;
 312
 313         if (win < 0 || win >= WINDOWS_NR)
 314                 return;
 315
 316         win_data = &ctx->win_data[win];
 317
 318         win_data->enabled = true;
 319
 320         DRM_DEBUG_KMS("dma_addr = 0x%x\n", win_data->dma_addr);
 321
 322         if (ctx->vblank_on)
 323                 schedule_work(&ctx->work);
 324 }
 325
 326 static void vidi_win_disable(struct device *dev, int zpos)
 327 {
 328         struct vidi_context *ctx = get_vidi_context(dev);
 329         struct vidi_win_data *win_data;
 330         int win = zpos;
 331
 332         if (win == DEFAULT_ZPOS)
 333                 win = ctx->default_win;
 334
 335         if (win < 0 || win >= WINDOWS_NR)
 336                 return;
 337
 338         win_data = &ctx->win_data[win];
 339         win_data->enabled = false;
 340
 341         /* TODO. */
 342 }
 343
 344 static struct exynos_drm_overlay_ops vidi_overlay_ops = {
 345         .mode_set = vidi_win_mode_set,
 346         .commit = vidi_win_commit,
 347         .disable = vidi_win_disable,
 348 };
 349
 350 static struct exynos_drm_manager vidi_manager = {
 351         .pipe           = -1,
 352         .ops            = &vidi_manager_ops,
 353         .overlay_ops    = &vidi_overlay_ops,
 354         .display_ops    = &vidi_display_ops,
 355 };
 356
 357 static void vidi_fake_vblank_handler(struct work_struct *work)
 358 {
 359         struct vidi_context *ctx = container_of(work, struct vidi_context,
 360                                         work);
 361         struct exynos_drm_subdrv *subdrv = &ctx->subdrv;
 362         struct exynos_drm_manager *manager = subdrv->manager;
 363
 364         if (manager->pipe < 0)
 365                 return;
 366
 367         /* refresh rate is about 50Hz. */
 368         usleep_range(16000, 20000);
 369
 370         mutex_lock(&ctx->lock);
 371
 372         if (ctx->direct_vblank) {
 373                 drm_handle_vblank(subdrv->drm_dev, manager->pipe);
 374                 ctx->direct_vblank = false;
 375                 mutex_unlock(&ctx->lock);
 376                 return;
 377         }
 378
 379         mutex_unlock(&ctx->lock);
 380
 381         exynos_drm_crtc_finish_pageflip(subdrv->drm_dev, manager->pipe);
 382 }
 383
 384 static int vidi_subdrv_probe(struct drm_device *drm_dev, struct device *dev)
 385 {
 386         /*
 387          * enable drm irq mode.
 388          * - with irq_enabled = 1, we can use the vblank feature.
 389          *
 390          * P.S. note that we wouldn't use drm irq handler but
 391          *      just specific driver own one instead because
 392          *      drm framework supports only one irq handler.
 393          */
 394         drm_dev->irq_enabled = 1;
 395
 396         /*
 397          * with vblank_disable_allowed = 1, vblank interrupt will be disabled
 398          * by drm timer once a current process gives up ownership of
 399          * vblank event.(after drm_vblank_put function is called)
 400          */
 401         drm_dev->vblank_disable_allowed = 1;
 402
 403         return 0;
 404 }
 405
 406 static void vidi_subdrv_remove(struct drm_device *drm_dev, struct device *dev)
 407 {
 408         /* TODO. */
 409 }
 410
 411 static int vidi_power_on(struct vidi_context *ctx, bool enable)
 412 {
 413         struct exynos_drm_subdrv *subdrv = &ctx->subdrv;
 414         struct device *dev = subdrv->dev;
 415
 416         if (enable) {
 417                 ctx->suspended = false;
 418
 419                 /* if vblank was enabled status, enable it again. */
 420                 if (test_and_clear_bit(0, &ctx->irq_flags))
 421                         vidi_enable_vblank(dev);
 422
 423                 vidi_apply(dev);
 424         } else {
 425                 ctx->suspended = true;
 426         }
 427
 428         return 0;
 429 }
 430
 431 static int vidi_show_connection(struct device *dev,
 432                                 struct device_attribute *attr, char *buf)
 433 {
 434         int rc;
 435         struct vidi_context *ctx = get_vidi_context(dev);
 436
 437         mutex_lock(&ctx->lock);
 438
 439         rc = sprintf(buf, "%d\n", ctx->connected);
 440
 441         mutex_unlock(&ctx->lock);
 442
 443         return rc;
 444 }
 445
 446 static int vidi_store_connection(struct device *dev,
 447                                 struct device_attribute *attr,
 448                                 const char *buf, size_t len)
 449 {
 450         struct vidi_context *ctx = get_vidi_context(dev);
 451         int ret;
 452
 453         ret = kstrtoint(buf, 0, &ctx->connected);
 454         if (ret)
 455                 return ret;
 456
 457         if (ctx->connected > 1)
 458                 return -EINVAL;
 459
 460         /* use fake edid data for test. */
 461         if (!ctx->raw_edid)
 462                 ctx->raw_edid = (struct edid *)fake_edid_info;
 463
 464         /* if raw_edid isn't same as fake data then it can't be tested. */
 465         if (ctx->raw_edid != (struct edid *)fake_edid_info) {
 466                 DRM_DEBUG_KMS("edid data is not fake data.\n");
 467                 return -EINVAL;
 468         }
 469
 470         DRM_DEBUG_KMS("requested connection.\n");
 471
 472         drm_helper_hpd_irq_event(ctx->subdrv.drm_dev);
 473
 474         return len;
 475 }
 476
 477 static DEVICE_ATTR(connection, 0644, vidi_show_connection,
 478                         vidi_store_connection);
 479
 480 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data,
 481                                 struct drm_file *file_priv)
 482 {
 483         struct vidi_context *ctx = NULL;
 484         struct drm_encoder *encoder;
 485         struct exynos_drm_manager *manager;
 486         struct exynos_drm_display_ops *display_ops;
 487         struct drm_exynos_vidi_connection *vidi = data;
 488         int edid_len;
 489
 490         if (!vidi) {
 491                 DRM_DEBUG_KMS("user data for vidi is null.\n");
 492                 return -EINVAL;
 493         }
 494
 495         if (vidi->connection > 1) {
 496                 DRM_DEBUG_KMS("connection should be 0 or 1.\n");
 497                 return -EINVAL;
 498         }
 499
 500         list_for_each_entry(encoder, &drm_dev->mode_config.encoder_list,
 501                                                                 head) {
 502                 manager = exynos_drm_get_manager(encoder);
 503                 display_ops = manager->display_ops;
 504
 505                 if (display_ops->type == EXYNOS_DISPLAY_TYPE_VIDI) {
 506                         ctx = get_vidi_context(manager->dev);
 507                         break;
 508                 }
 509         }
 510
 511         if (!ctx) {
 512                 DRM_DEBUG_KMS("not found virtual device type encoder.\n");
 513                 return -EINVAL;
 514         }
 515
 516         if (ctx->connected == vidi->connection) {
 517                 DRM_DEBUG_KMS("same connection request.\n");
 518                 return -EINVAL;
 519         }
 520
 521         if (vidi->connection) {
 522                 struct edid *raw_edid  = (struct edid *)(uint32_t)vidi->edid;
 523                 if (!drm_edid_is_valid(raw_edid)) {
 524                         DRM_DEBUG_KMS("edid data is invalid.\n");
 525                         return -EINVAL;
 526                 }
 527                 edid_len = (1 + raw_edid->extensions) * EDID_LENGTH;
 528                 ctx->raw_edid = kmemdup(raw_edid, edid_len, GFP_KERNEL);
 529                 if (!ctx->raw_edid) {
 530                         DRM_DEBUG_KMS("failed to allocate raw_edid.\n");
 531                         return -ENOMEM;
 532                 }
 533         } else {
 534                 /*
 535                  * with connection = 0, free raw_edid
 536                  * only if raw edid data isn't same as fake data.
 537                  */
 538                 if (ctx->raw_edid && ctx->raw_edid !=
 539                                 (struct edid *)fake_edid_info) {
 540                         kfree(ctx->raw_edid);
 541                         ctx->raw_edid = NULL;
 542                 }
 543         }
 544
 545         ctx->connected = vidi->connection;
 546         drm_helper_hpd_irq_event(ctx->subdrv.drm_dev);
 547
 548         return 0;
 549 }
 550
 551 static int vidi_probe(struct platform_device *pdev)
 552 {
 553         struct device *dev = &pdev->dev;
 554         struct vidi_context *ctx;
 555         struct exynos_drm_subdrv *subdrv;
 556         int ret;
 557
 558         ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
 559         if (!ctx)
 560                 return -ENOMEM;
 561
 562         ctx->default_win = 0;
 563
 564         INIT_WORK(&ctx->work, vidi_fake_vblank_handler);
 565
 566         subdrv = &ctx->subdrv;
 567         subdrv->dev = dev;
 568         subdrv->manager = &vidi_manager;
 569         subdrv->probe = vidi_subdrv_probe;
 570         subdrv->remove = vidi_subdrv_remove;
 571
 572         mutex_init(&ctx->lock);
 573
 574         platform_set_drvdata(pdev, ctx);
 575
 576         ret = device_create_file(dev, &dev_attr_connection);
 577         if (ret < 0)
 578                 DRM_INFO("failed to create connection sysfs.\n");
 579
 580         exynos_drm_subdrv_register(subdrv);
 581
 582         return 0;
 583 }
 584
 585 static int vidi_remove(struct platform_device *pdev)
 586 {
 587         struct vidi_context *ctx = platform_get_drvdata(pdev);
 588
 589         exynos_drm_subdrv_unregister(&ctx->subdrv);
 590
 591         if (ctx->raw_edid != (struct edid *)fake_edid_info) {
 592                 kfree(ctx->raw_edid);
 593                 ctx->raw_edid = NULL;
 594         }
 595
 596         return 0;
 597 }
 598
 599 #ifdef CONFIG_PM_SLEEP
 600 static int vidi_suspend(struct device *dev)
 601 {
 602         struct vidi_context *ctx = get_vidi_context(dev);
 603
 604         return vidi_power_on(ctx, false);
 605 }
 606
 607 static int vidi_resume(struct device *dev)
 608 {
 609         struct vidi_context *ctx = get_vidi_context(dev);
 610
 611         return vidi_power_on(ctx, true);
 612 }
 613 #endif
 614
 615 static const struct dev_pm_ops vidi_pm_ops = {
 616         SET_SYSTEM_SLEEP_PM_OPS(vidi_suspend, vidi_resume)
 617 };
 618
 619 struct platform_driver vidi_driver = {
 620         .probe          = vidi_probe,
 621         .remove         = vidi_remove,
 622         .driver         = {
 623                 .name   = "exynos-drm-vidi",
 624                 .owner  = THIS_MODULE,
 625                 .pm     = &vidi_pm_ops,
 626         },
 627 };