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