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/module.h> 17 #include <linux/platform_device.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_encoder.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 DRM_DEBUG_KMS("%s\n", __FILE__); 93 94 /* 95 * connection request would come from user side 96 * to do hotplug through specific ioctl. 97 */ 98 return ctx->connected ? true : false; 99 } 100 101 static struct edid *vidi_get_edid(struct device *dev, 102 struct drm_connector *connector) 103 { 104 struct vidi_context *ctx = get_vidi_context(dev); 105 struct edid *edid; 106 int edid_len; 107 108 DRM_DEBUG_KMS("%s\n", __FILE__); 109 110 /* 111 * the edid data comes from user side and it would be set 112 * to ctx->raw_edid through specific ioctl. 113 */ 114 if (!ctx->raw_edid) { 115 DRM_DEBUG_KMS("raw_edid is null.\n"); 116 return ERR_PTR(-EFAULT); 117 } 118 119 edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH; 120 edid = kzalloc(edid_len, GFP_KERNEL); 121 if (!edid) { 122 DRM_DEBUG_KMS("failed to allocate edid\n"); 123 return ERR_PTR(-ENOMEM); 124 } 125 126 memcpy(edid, ctx->raw_edid, edid_len); 127 return edid; 128 } 129 130 static void *vidi_get_panel(struct device *dev) 131 { 132 DRM_DEBUG_KMS("%s\n", __FILE__); 133 134 /* TODO. */ 135 136 return NULL; 137 } 138 139 static int vidi_check_timing(struct device *dev, void *timing) 140 { 141 DRM_DEBUG_KMS("%s\n", __FILE__); 142 143 /* TODO. */ 144 145 return 0; 146 } 147 148 static int vidi_display_power_on(struct device *dev, int mode) 149 { 150 DRM_DEBUG_KMS("%s\n", __FILE__); 151 152 /* TODO */ 153 154 return 0; 155 } 156 157 static struct exynos_drm_display_ops vidi_display_ops = { 158 .type = EXYNOS_DISPLAY_TYPE_VIDI, 159 .is_connected = vidi_display_is_connected, 160 .get_edid = vidi_get_edid, 161 .get_panel = vidi_get_panel, 162 .check_timing = vidi_check_timing, 163 .power_on = vidi_display_power_on, 164 }; 165 166 static void vidi_dpms(struct device *subdrv_dev, int mode) 167 { 168 struct vidi_context *ctx = get_vidi_context(subdrv_dev); 169 170 DRM_DEBUG_KMS("%s, %d\n", __FILE__, mode); 171 172 mutex_lock(&ctx->lock); 173 174 switch (mode) { 175 case DRM_MODE_DPMS_ON: 176 /* TODO. */ 177 break; 178 case DRM_MODE_DPMS_STANDBY: 179 case DRM_MODE_DPMS_SUSPEND: 180 case DRM_MODE_DPMS_OFF: 181 /* TODO. */ 182 break; 183 default: 184 DRM_DEBUG_KMS("unspecified mode %d\n", mode); 185 break; 186 } 187 188 mutex_unlock(&ctx->lock); 189 } 190 191 static void vidi_apply(struct device *subdrv_dev) 192 { 193 struct vidi_context *ctx = get_vidi_context(subdrv_dev); 194 struct exynos_drm_manager *mgr = ctx->subdrv.manager; 195 struct exynos_drm_manager_ops *mgr_ops = mgr->ops; 196 struct exynos_drm_overlay_ops *ovl_ops = mgr->overlay_ops; 197 struct vidi_win_data *win_data; 198 int i; 199 200 DRM_DEBUG_KMS("%s\n", __FILE__); 201 202 for (i = 0; i < WINDOWS_NR; i++) { 203 win_data = &ctx->win_data[i]; 204 if (win_data->enabled && (ovl_ops && ovl_ops->commit)) 205 ovl_ops->commit(subdrv_dev, i); 206 } 207 208 if (mgr_ops && mgr_ops->commit) 209 mgr_ops->commit(subdrv_dev); 210 } 211 212 static void vidi_commit(struct device *dev) 213 { 214 struct vidi_context *ctx = get_vidi_context(dev); 215 216 DRM_DEBUG_KMS("%s\n", __FILE__); 217 218 if (ctx->suspended) 219 return; 220 } 221 222 static int vidi_enable_vblank(struct device *dev) 223 { 224 struct vidi_context *ctx = get_vidi_context(dev); 225 226 DRM_DEBUG_KMS("%s\n", __FILE__); 227 228 if (ctx->suspended) 229 return -EPERM; 230 231 if (!test_and_set_bit(0, &ctx->irq_flags)) 232 ctx->vblank_on = true; 233 234 ctx->direct_vblank = true; 235 236 /* 237 * in case of page flip request, vidi_finish_pageflip function 238 * will not be called because direct_vblank is true and then 239 * that function will be called by overlay_ops->commit callback 240 */ 241 schedule_work(&ctx->work); 242 243 return 0; 244 } 245 246 static void vidi_disable_vblank(struct device *dev) 247 { 248 struct vidi_context *ctx = get_vidi_context(dev); 249 250 DRM_DEBUG_KMS("%s\n", __FILE__); 251 252 if (ctx->suspended) 253 return; 254 255 if (test_and_clear_bit(0, &ctx->irq_flags)) 256 ctx->vblank_on = false; 257 } 258 259 static struct exynos_drm_manager_ops vidi_manager_ops = { 260 .dpms = vidi_dpms, 261 .apply = vidi_apply, 262 .commit = vidi_commit, 263 .enable_vblank = vidi_enable_vblank, 264 .disable_vblank = vidi_disable_vblank, 265 }; 266 267 static void vidi_win_mode_set(struct device *dev, 268 struct exynos_drm_overlay *overlay) 269 { 270 struct vidi_context *ctx = get_vidi_context(dev); 271 struct vidi_win_data *win_data; 272 int win; 273 unsigned long offset; 274 275 DRM_DEBUG_KMS("%s\n", __FILE__); 276 277 if (!overlay) { 278 dev_err(dev, "overlay is NULL\n"); 279 return; 280 } 281 282 win = overlay->zpos; 283 if (win == DEFAULT_ZPOS) 284 win = ctx->default_win; 285 286 if (win < 0 || win > WINDOWS_NR) 287 return; 288 289 offset = overlay->fb_x * (overlay->bpp >> 3); 290 offset += overlay->fb_y * overlay->pitch; 291 292 DRM_DEBUG_KMS("offset = 0x%lx, pitch = %x\n", offset, overlay->pitch); 293 294 win_data = &ctx->win_data[win]; 295 296 win_data->offset_x = overlay->crtc_x; 297 win_data->offset_y = overlay->crtc_y; 298 win_data->ovl_width = overlay->crtc_width; 299 win_data->ovl_height = overlay->crtc_height; 300 win_data->fb_width = overlay->fb_width; 301 win_data->fb_height = overlay->fb_height; 302 win_data->dma_addr = overlay->dma_addr[0] + offset; 303 win_data->bpp = overlay->bpp; 304 win_data->buf_offsize = (overlay->fb_width - overlay->crtc_width) * 305 (overlay->bpp >> 3); 306 win_data->line_size = overlay->crtc_width * (overlay->bpp >> 3); 307 308 /* 309 * some parts of win_data should be transferred to user side 310 * through specific ioctl. 311 */ 312 313 DRM_DEBUG_KMS("offset_x = %d, offset_y = %d\n", 314 win_data->offset_x, win_data->offset_y); 315 DRM_DEBUG_KMS("ovl_width = %d, ovl_height = %d\n", 316 win_data->ovl_width, win_data->ovl_height); 317 DRM_DEBUG_KMS("paddr = 0x%lx\n", (unsigned long)win_data->dma_addr); 318 DRM_DEBUG_KMS("fb_width = %d, crtc_width = %d\n", 319 overlay->fb_width, overlay->crtc_width); 320 } 321 322 static void vidi_win_commit(struct device *dev, int zpos) 323 { 324 struct vidi_context *ctx = get_vidi_context(dev); 325 struct vidi_win_data *win_data; 326 int win = zpos; 327 328 DRM_DEBUG_KMS("%s\n", __FILE__); 329 330 if (ctx->suspended) 331 return; 332 333 if (win == DEFAULT_ZPOS) 334 win = ctx->default_win; 335 336 if (win < 0 || win > WINDOWS_NR) 337 return; 338 339 win_data = &ctx->win_data[win]; 340 341 win_data->enabled = true; 342 343 DRM_DEBUG_KMS("dma_addr = 0x%x\n", win_data->dma_addr); 344 345 if (ctx->vblank_on) 346 schedule_work(&ctx->work); 347 } 348 349 static void vidi_win_disable(struct device *dev, int zpos) 350 { 351 struct vidi_context *ctx = get_vidi_context(dev); 352 struct vidi_win_data *win_data; 353 int win = zpos; 354 355 DRM_DEBUG_KMS("%s\n", __FILE__); 356 357 if (win == DEFAULT_ZPOS) 358 win = ctx->default_win; 359 360 if (win < 0 || win > WINDOWS_NR) 361 return; 362 363 win_data = &ctx->win_data[win]; 364 win_data->enabled = false; 365 366 /* TODO. */ 367 } 368 369 static struct exynos_drm_overlay_ops vidi_overlay_ops = { 370 .mode_set = vidi_win_mode_set, 371 .commit = vidi_win_commit, 372 .disable = vidi_win_disable, 373 }; 374 375 static struct exynos_drm_manager vidi_manager = { 376 .pipe = -1, 377 .ops = &vidi_manager_ops, 378 .overlay_ops = &vidi_overlay_ops, 379 .display_ops = &vidi_display_ops, 380 }; 381 382 static void vidi_fake_vblank_handler(struct work_struct *work) 383 { 384 struct vidi_context *ctx = container_of(work, struct vidi_context, 385 work); 386 struct exynos_drm_subdrv *subdrv = &ctx->subdrv; 387 struct exynos_drm_manager *manager = subdrv->manager; 388 389 if (manager->pipe < 0) 390 return; 391 392 /* refresh rate is about 50Hz. */ 393 usleep_range(16000, 20000); 394 395 mutex_lock(&ctx->lock); 396 397 if (ctx->direct_vblank) { 398 drm_handle_vblank(subdrv->drm_dev, manager->pipe); 399 ctx->direct_vblank = false; 400 mutex_unlock(&ctx->lock); 401 return; 402 } 403 404 mutex_unlock(&ctx->lock); 405 406 exynos_drm_crtc_finish_pageflip(subdrv->drm_dev, manager->pipe); 407 } 408 409 static int vidi_subdrv_probe(struct drm_device *drm_dev, struct device *dev) 410 { 411 DRM_DEBUG_KMS("%s\n", __FILE__); 412 413 /* 414 * enable drm irq mode. 415 * - with irq_enabled = 1, we can use the vblank feature. 416 * 417 * P.S. note that we wouldn't use drm irq handler but 418 * just specific driver own one instead because 419 * drm framework supports only one irq handler. 420 */ 421 drm_dev->irq_enabled = 1; 422 423 /* 424 * with vblank_disable_allowed = 1, vblank interrupt will be disabled 425 * by drm timer once a current process gives up ownership of 426 * vblank event.(after drm_vblank_put function is called) 427 */ 428 drm_dev->vblank_disable_allowed = 1; 429 430 return 0; 431 } 432 433 static void vidi_subdrv_remove(struct drm_device *drm_dev, struct device *dev) 434 { 435 DRM_DEBUG_KMS("%s\n", __FILE__); 436 437 /* TODO. */ 438 } 439 440 static int vidi_power_on(struct vidi_context *ctx, bool enable) 441 { 442 struct exynos_drm_subdrv *subdrv = &ctx->subdrv; 443 struct device *dev = subdrv->dev; 444 445 DRM_DEBUG_KMS("%s\n", __FILE__); 446 447 if (enable != false && enable != true) 448 return -EINVAL; 449 450 if (enable) { 451 ctx->suspended = false; 452 453 /* if vblank was enabled status, enable it again. */ 454 if (test_and_clear_bit(0, &ctx->irq_flags)) 455 vidi_enable_vblank(dev); 456 457 vidi_apply(dev); 458 } else { 459 ctx->suspended = true; 460 } 461 462 return 0; 463 } 464 465 static int vidi_show_connection(struct device *dev, 466 struct device_attribute *attr, char *buf) 467 { 468 int rc; 469 struct vidi_context *ctx = get_vidi_context(dev); 470 471 mutex_lock(&ctx->lock); 472 473 rc = sprintf(buf, "%d\n", ctx->connected); 474 475 mutex_unlock(&ctx->lock); 476 477 return rc; 478 } 479 480 static int vidi_store_connection(struct device *dev, 481 struct device_attribute *attr, 482 const char *buf, size_t len) 483 { 484 struct vidi_context *ctx = get_vidi_context(dev); 485 int ret; 486 487 DRM_DEBUG_KMS("%s\n", __FILE__); 488 489 ret = kstrtoint(buf, 0, &ctx->connected); 490 if (ret) 491 return ret; 492 493 if (ctx->connected > 1) 494 return -EINVAL; 495 496 /* use fake edid data for test. */ 497 if (!ctx->raw_edid) 498 ctx->raw_edid = (struct edid *)fake_edid_info; 499 500 /* if raw_edid isn't same as fake data then it can't be tested. */ 501 if (ctx->raw_edid != (struct edid *)fake_edid_info) { 502 DRM_DEBUG_KMS("edid data is not fake data.\n"); 503 return -EINVAL; 504 } 505 506 DRM_DEBUG_KMS("requested connection.\n"); 507 508 drm_helper_hpd_irq_event(ctx->subdrv.drm_dev); 509 510 return len; 511 } 512 513 static DEVICE_ATTR(connection, 0644, vidi_show_connection, 514 vidi_store_connection); 515 516 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data, 517 struct drm_file *file_priv) 518 { 519 struct vidi_context *ctx = NULL; 520 struct drm_encoder *encoder; 521 struct exynos_drm_manager *manager; 522 struct exynos_drm_display_ops *display_ops; 523 struct drm_exynos_vidi_connection *vidi = data; 524 int edid_len; 525 526 DRM_DEBUG_KMS("%s\n", __FILE__); 527 528 if (!vidi) { 529 DRM_DEBUG_KMS("user data for vidi is null.\n"); 530 return -EINVAL; 531 } 532 533 if (vidi->connection > 1) { 534 DRM_DEBUG_KMS("connection should be 0 or 1.\n"); 535 return -EINVAL; 536 } 537 538 list_for_each_entry(encoder, &drm_dev->mode_config.encoder_list, 539 head) { 540 manager = exynos_drm_get_manager(encoder); 541 display_ops = manager->display_ops; 542 543 if (display_ops->type == EXYNOS_DISPLAY_TYPE_VIDI) { 544 ctx = get_vidi_context(manager->dev); 545 break; 546 } 547 } 548 549 if (!ctx) { 550 DRM_DEBUG_KMS("not found virtual device type encoder.\n"); 551 return -EINVAL; 552 } 553 554 if (ctx->connected == vidi->connection) { 555 DRM_DEBUG_KMS("same connection request.\n"); 556 return -EINVAL; 557 } 558 559 if (vidi->connection) { 560 struct edid *raw_edid = (struct edid *)(uint32_t)vidi->edid; 561 if (!drm_edid_is_valid(raw_edid)) { 562 DRM_DEBUG_KMS("edid data is invalid.\n"); 563 return -EINVAL; 564 } 565 edid_len = (1 + raw_edid->extensions) * EDID_LENGTH; 566 ctx->raw_edid = kzalloc(edid_len, GFP_KERNEL); 567 if (!ctx->raw_edid) { 568 DRM_DEBUG_KMS("failed to allocate raw_edid.\n"); 569 return -ENOMEM; 570 } 571 memcpy(ctx->raw_edid, raw_edid, edid_len); 572 } else { 573 /* 574 * with connection = 0, free raw_edid 575 * only if raw edid data isn't same as fake data. 576 */ 577 if (ctx->raw_edid && ctx->raw_edid != 578 (struct edid *)fake_edid_info) { 579 kfree(ctx->raw_edid); 580 ctx->raw_edid = NULL; 581 } 582 } 583 584 ctx->connected = vidi->connection; 585 drm_helper_hpd_irq_event(ctx->subdrv.drm_dev); 586 587 return 0; 588 } 589 590 static int vidi_probe(struct platform_device *pdev) 591 { 592 struct device *dev = &pdev->dev; 593 struct vidi_context *ctx; 594 struct exynos_drm_subdrv *subdrv; 595 int ret; 596 597 DRM_DEBUG_KMS("%s\n", __FILE__); 598 599 ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL); 600 if (!ctx) 601 return -ENOMEM; 602 603 ctx->default_win = 0; 604 605 INIT_WORK(&ctx->work, vidi_fake_vblank_handler); 606 607 subdrv = &ctx->subdrv; 608 subdrv->dev = dev; 609 subdrv->manager = &vidi_manager; 610 subdrv->probe = vidi_subdrv_probe; 611 subdrv->remove = vidi_subdrv_remove; 612 613 mutex_init(&ctx->lock); 614 615 platform_set_drvdata(pdev, ctx); 616 617 ret = device_create_file(&pdev->dev, &dev_attr_connection); 618 if (ret < 0) 619 DRM_INFO("failed to create connection sysfs.\n"); 620 621 exynos_drm_subdrv_register(subdrv); 622 623 return 0; 624 } 625 626 static int vidi_remove(struct platform_device *pdev) 627 { 628 struct vidi_context *ctx = platform_get_drvdata(pdev); 629 630 DRM_DEBUG_KMS("%s\n", __FILE__); 631 632 exynos_drm_subdrv_unregister(&ctx->subdrv); 633 634 if (ctx->raw_edid != (struct edid *)fake_edid_info) { 635 kfree(ctx->raw_edid); 636 ctx->raw_edid = NULL; 637 } 638 639 return 0; 640 } 641 642 #ifdef CONFIG_PM_SLEEP 643 static int vidi_suspend(struct device *dev) 644 { 645 struct vidi_context *ctx = get_vidi_context(dev); 646 647 return vidi_power_on(ctx, false); 648 } 649 650 static int vidi_resume(struct device *dev) 651 { 652 struct vidi_context *ctx = get_vidi_context(dev); 653 654 return vidi_power_on(ctx, true); 655 } 656 #endif 657 658 static const struct dev_pm_ops vidi_pm_ops = { 659 SET_SYSTEM_SLEEP_PM_OPS(vidi_suspend, vidi_resume) 660 }; 661 662 struct platform_driver vidi_driver = { 663 .probe = vidi_probe, 664 .remove = vidi_remove, 665 .driver = { 666 .name = "exynos-drm-vidi", 667 .owner = THIS_MODULE, 668 .pm = &vidi_pm_ops, 669 }, 670 }; 671