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_mgr(dev) platform_get_drvdata(to_platform_device(dev)) 32 #define ctx_from_connector(c) container_of(c, struct vidi_context, \ 33 connector) 34 35 struct vidi_win_data { 36 unsigned int offset_x; 37 unsigned int offset_y; 38 unsigned int ovl_width; 39 unsigned int ovl_height; 40 unsigned int fb_width; 41 unsigned int fb_height; 42 unsigned int bpp; 43 dma_addr_t dma_addr; 44 unsigned int buf_offsize; 45 unsigned int line_size; /* bytes */ 46 bool enabled; 47 }; 48 49 struct vidi_context { 50 struct drm_device *drm_dev; 51 struct drm_crtc *crtc; 52 struct drm_encoder *encoder; 53 struct drm_connector connector; 54 struct vidi_win_data win_data[WINDOWS_NR]; 55 struct edid *raw_edid; 56 unsigned int clkdiv; 57 unsigned int default_win; 58 unsigned long irq_flags; 59 unsigned int connected; 60 bool vblank_on; 61 bool suspended; 62 bool direct_vblank; 63 struct work_struct work; 64 struct mutex lock; 65 int pipe; 66 }; 67 68 static const char fake_edid_info[] = { 69 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x4c, 0x2d, 0x05, 0x05, 70 0x00, 0x00, 0x00, 0x00, 0x30, 0x12, 0x01, 0x03, 0x80, 0x10, 0x09, 0x78, 71 0x0a, 0xee, 0x91, 0xa3, 0x54, 0x4c, 0x99, 0x26, 0x0f, 0x50, 0x54, 0xbd, 72 0xee, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 73 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xb0, 0x51, 0x00, 74 0x1b, 0x30, 0x40, 0x70, 0x36, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 75 0x01, 0x1d, 0x00, 0x72, 0x51, 0xd0, 0x1e, 0x20, 0x6e, 0x28, 0x55, 0x00, 76 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18, 77 0x4b, 0x1a, 0x44, 0x17, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 78 0x00, 0x00, 0x00, 0xfc, 0x00, 0x53, 0x41, 0x4d, 0x53, 0x55, 0x4e, 0x47, 79 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0xbc, 0x02, 0x03, 0x1e, 0xf1, 80 0x46, 0x84, 0x05, 0x03, 0x10, 0x20, 0x22, 0x23, 0x09, 0x07, 0x07, 0x83, 81 0x01, 0x00, 0x00, 0xe2, 0x00, 0x0f, 0x67, 0x03, 0x0c, 0x00, 0x10, 0x00, 82 0xb8, 0x2d, 0x01, 0x1d, 0x80, 0x18, 0x71, 0x1c, 0x16, 0x20, 0x58, 0x2c, 83 0x25, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x9e, 0x8c, 0x0a, 0xd0, 0x8a, 84 0x20, 0xe0, 0x2d, 0x10, 0x10, 0x3e, 0x96, 0x00, 0xa0, 0x5a, 0x00, 0x00, 85 0x00, 0x18, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c, 86 0x45, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0x00, 87 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 88 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 89 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 90 0x00, 0x00, 0x00, 0x06 91 }; 92 93 static void vidi_apply(struct exynos_drm_manager *mgr) 94 { 95 struct vidi_context *ctx = mgr->ctx; 96 struct exynos_drm_manager_ops *mgr_ops = mgr->ops; 97 struct vidi_win_data *win_data; 98 int i; 99 100 for (i = 0; i < WINDOWS_NR; i++) { 101 win_data = &ctx->win_data[i]; 102 if (win_data->enabled && (mgr_ops && mgr_ops->win_commit)) 103 mgr_ops->win_commit(mgr, i); 104 } 105 106 if (mgr_ops && mgr_ops->commit) 107 mgr_ops->commit(mgr); 108 } 109 110 static void vidi_commit(struct exynos_drm_manager *mgr) 111 { 112 struct vidi_context *ctx = mgr->ctx; 113 114 if (ctx->suspended) 115 return; 116 } 117 118 static int vidi_enable_vblank(struct exynos_drm_manager *mgr) 119 { 120 struct vidi_context *ctx = mgr->ctx; 121 122 if (ctx->suspended) 123 return -EPERM; 124 125 if (!test_and_set_bit(0, &ctx->irq_flags)) 126 ctx->vblank_on = true; 127 128 ctx->direct_vblank = true; 129 130 /* 131 * in case of page flip request, vidi_finish_pageflip function 132 * will not be called because direct_vblank is true and then 133 * that function will be called by manager_ops->win_commit callback 134 */ 135 schedule_work(&ctx->work); 136 137 return 0; 138 } 139 140 static void vidi_disable_vblank(struct exynos_drm_manager *mgr) 141 { 142 struct vidi_context *ctx = mgr->ctx; 143 144 if (ctx->suspended) 145 return; 146 147 if (test_and_clear_bit(0, &ctx->irq_flags)) 148 ctx->vblank_on = false; 149 } 150 151 static void vidi_win_mode_set(struct exynos_drm_manager *mgr, 152 struct exynos_drm_overlay *overlay) 153 { 154 struct vidi_context *ctx = mgr->ctx; 155 struct vidi_win_data *win_data; 156 int win; 157 unsigned long offset; 158 159 if (!overlay) { 160 DRM_ERROR("overlay is NULL\n"); 161 return; 162 } 163 164 win = overlay->zpos; 165 if (win == DEFAULT_ZPOS) 166 win = ctx->default_win; 167 168 if (win < 0 || win >= WINDOWS_NR) 169 return; 170 171 offset = overlay->fb_x * (overlay->bpp >> 3); 172 offset += overlay->fb_y * overlay->pitch; 173 174 DRM_DEBUG_KMS("offset = 0x%lx, pitch = %x\n", offset, overlay->pitch); 175 176 win_data = &ctx->win_data[win]; 177 178 win_data->offset_x = overlay->crtc_x; 179 win_data->offset_y = overlay->crtc_y; 180 win_data->ovl_width = overlay->crtc_width; 181 win_data->ovl_height = overlay->crtc_height; 182 win_data->fb_width = overlay->fb_width; 183 win_data->fb_height = overlay->fb_height; 184 win_data->dma_addr = overlay->dma_addr[0] + offset; 185 win_data->bpp = overlay->bpp; 186 win_data->buf_offsize = (overlay->fb_width - overlay->crtc_width) * 187 (overlay->bpp >> 3); 188 win_data->line_size = overlay->crtc_width * (overlay->bpp >> 3); 189 190 /* 191 * some parts of win_data should be transferred to user side 192 * through specific ioctl. 193 */ 194 195 DRM_DEBUG_KMS("offset_x = %d, offset_y = %d\n", 196 win_data->offset_x, win_data->offset_y); 197 DRM_DEBUG_KMS("ovl_width = %d, ovl_height = %d\n", 198 win_data->ovl_width, win_data->ovl_height); 199 DRM_DEBUG_KMS("paddr = 0x%lx\n", (unsigned long)win_data->dma_addr); 200 DRM_DEBUG_KMS("fb_width = %d, crtc_width = %d\n", 201 overlay->fb_width, overlay->crtc_width); 202 } 203 204 static void vidi_win_commit(struct exynos_drm_manager *mgr, int zpos) 205 { 206 struct vidi_context *ctx = mgr->ctx; 207 struct vidi_win_data *win_data; 208 int win = zpos; 209 210 if (ctx->suspended) 211 return; 212 213 if (win == DEFAULT_ZPOS) 214 win = ctx->default_win; 215 216 if (win < 0 || win >= WINDOWS_NR) 217 return; 218 219 win_data = &ctx->win_data[win]; 220 221 win_data->enabled = true; 222 223 DRM_DEBUG_KMS("dma_addr = 0x%x\n", win_data->dma_addr); 224 225 if (ctx->vblank_on) 226 schedule_work(&ctx->work); 227 } 228 229 static void vidi_win_disable(struct exynos_drm_manager *mgr, int zpos) 230 { 231 struct vidi_context *ctx = mgr->ctx; 232 struct vidi_win_data *win_data; 233 int win = zpos; 234 235 if (win == DEFAULT_ZPOS) 236 win = ctx->default_win; 237 238 if (win < 0 || win >= WINDOWS_NR) 239 return; 240 241 win_data = &ctx->win_data[win]; 242 win_data->enabled = false; 243 244 /* TODO. */ 245 } 246 247 static int vidi_power_on(struct exynos_drm_manager *mgr, bool enable) 248 { 249 struct vidi_context *ctx = mgr->ctx; 250 251 DRM_DEBUG_KMS("%s\n", __FILE__); 252 253 if (enable != false && enable != true) 254 return -EINVAL; 255 256 if (enable) { 257 ctx->suspended = false; 258 259 /* if vblank was enabled status, enable it again. */ 260 if (test_and_clear_bit(0, &ctx->irq_flags)) 261 vidi_enable_vblank(mgr); 262 263 vidi_apply(mgr); 264 } else { 265 ctx->suspended = true; 266 } 267 268 return 0; 269 } 270 271 static void vidi_dpms(struct exynos_drm_manager *mgr, int mode) 272 { 273 struct vidi_context *ctx = mgr->ctx; 274 275 DRM_DEBUG_KMS("%d\n", mode); 276 277 mutex_lock(&ctx->lock); 278 279 switch (mode) { 280 case DRM_MODE_DPMS_ON: 281 vidi_power_on(mgr, true); 282 break; 283 case DRM_MODE_DPMS_STANDBY: 284 case DRM_MODE_DPMS_SUSPEND: 285 case DRM_MODE_DPMS_OFF: 286 vidi_power_on(mgr, false); 287 break; 288 default: 289 DRM_DEBUG_KMS("unspecified mode %d\n", mode); 290 break; 291 } 292 293 mutex_unlock(&ctx->lock); 294 } 295 296 static int vidi_mgr_initialize(struct exynos_drm_manager *mgr, 297 struct drm_device *drm_dev, int pipe) 298 { 299 struct vidi_context *ctx = mgr->ctx; 300 301 DRM_ERROR("vidi initialize ct=%p dev=%p pipe=%d\n", ctx, drm_dev, pipe); 302 303 ctx->drm_dev = drm_dev; 304 ctx->pipe = pipe; 305 306 /* 307 * enable drm irq mode. 308 * - with irq_enabled = 1, we can use the vblank feature. 309 * 310 * P.S. note that we wouldn't use drm irq handler but 311 * just specific driver own one instead because 312 * drm framework supports only one irq handler. 313 */ 314 drm_dev->irq_enabled = 1; 315 316 /* 317 * with vblank_disable_allowed = 1, vblank interrupt will be disabled 318 * by drm timer once a current process gives up ownership of 319 * vblank event.(after drm_vblank_put function is called) 320 */ 321 drm_dev->vblank_disable_allowed = 1; 322 323 return 0; 324 } 325 326 static struct exynos_drm_manager_ops vidi_manager_ops = { 327 .initialize = vidi_mgr_initialize, 328 .dpms = vidi_dpms, 329 .commit = vidi_commit, 330 .enable_vblank = vidi_enable_vblank, 331 .disable_vblank = vidi_disable_vblank, 332 .win_mode_set = vidi_win_mode_set, 333 .win_commit = vidi_win_commit, 334 .win_disable = vidi_win_disable, 335 }; 336 337 static struct exynos_drm_manager vidi_manager = { 338 .type = EXYNOS_DISPLAY_TYPE_VIDI, 339 .ops = &vidi_manager_ops, 340 }; 341 342 static void vidi_fake_vblank_handler(struct work_struct *work) 343 { 344 struct vidi_context *ctx = container_of(work, struct vidi_context, 345 work); 346 347 if (ctx->pipe < 0) 348 return; 349 350 /* refresh rate is about 50Hz. */ 351 usleep_range(16000, 20000); 352 353 mutex_lock(&ctx->lock); 354 355 if (ctx->direct_vblank) { 356 drm_handle_vblank(ctx->drm_dev, ctx->pipe); 357 ctx->direct_vblank = false; 358 mutex_unlock(&ctx->lock); 359 return; 360 } 361 362 mutex_unlock(&ctx->lock); 363 364 exynos_drm_crtc_finish_pageflip(ctx->drm_dev, ctx->pipe); 365 } 366 367 static int vidi_show_connection(struct device *dev, 368 struct device_attribute *attr, char *buf) 369 { 370 int rc; 371 struct exynos_drm_manager *mgr = get_vidi_mgr(dev); 372 struct vidi_context *ctx = mgr->ctx; 373 374 mutex_lock(&ctx->lock); 375 376 rc = sprintf(buf, "%d\n", ctx->connected); 377 378 mutex_unlock(&ctx->lock); 379 380 return rc; 381 } 382 383 static int vidi_store_connection(struct device *dev, 384 struct device_attribute *attr, 385 const char *buf, size_t len) 386 { 387 struct exynos_drm_manager *mgr = get_vidi_mgr(dev); 388 struct vidi_context *ctx = mgr->ctx; 389 int ret; 390 391 ret = kstrtoint(buf, 0, &ctx->connected); 392 if (ret) 393 return ret; 394 395 if (ctx->connected > 1) 396 return -EINVAL; 397 398 /* use fake edid data for test. */ 399 if (!ctx->raw_edid) 400 ctx->raw_edid = (struct edid *)fake_edid_info; 401 402 /* if raw_edid isn't same as fake data then it can't be tested. */ 403 if (ctx->raw_edid != (struct edid *)fake_edid_info) { 404 DRM_DEBUG_KMS("edid data is not fake data.\n"); 405 return -EINVAL; 406 } 407 408 DRM_DEBUG_KMS("requested connection.\n"); 409 410 drm_helper_hpd_irq_event(ctx->drm_dev); 411 412 return len; 413 } 414 415 static DEVICE_ATTR(connection, 0644, vidi_show_connection, 416 vidi_store_connection); 417 418 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data, 419 struct drm_file *file_priv) 420 { 421 struct vidi_context *ctx = NULL; 422 struct drm_encoder *encoder; 423 struct exynos_drm_display *display; 424 struct drm_exynos_vidi_connection *vidi = data; 425 426 if (!vidi) { 427 DRM_DEBUG_KMS("user data for vidi is null.\n"); 428 return -EINVAL; 429 } 430 431 if (vidi->connection > 1) { 432 DRM_DEBUG_KMS("connection should be 0 or 1.\n"); 433 return -EINVAL; 434 } 435 436 list_for_each_entry(encoder, &drm_dev->mode_config.encoder_list, 437 head) { 438 display = exynos_drm_get_display(encoder); 439 440 if (display->type == EXYNOS_DISPLAY_TYPE_VIDI) { 441 ctx = display->ctx; 442 break; 443 } 444 } 445 446 if (!ctx) { 447 DRM_DEBUG_KMS("not found virtual device type encoder.\n"); 448 return -EINVAL; 449 } 450 451 if (ctx->connected == vidi->connection) { 452 DRM_DEBUG_KMS("same connection request.\n"); 453 return -EINVAL; 454 } 455 456 if (vidi->connection) { 457 struct edid *raw_edid = (struct edid *)(uint32_t)vidi->edid; 458 if (!drm_edid_is_valid(raw_edid)) { 459 DRM_DEBUG_KMS("edid data is invalid.\n"); 460 return -EINVAL; 461 } 462 ctx->raw_edid = drm_edid_duplicate(raw_edid); 463 if (!ctx->raw_edid) { 464 DRM_DEBUG_KMS("failed to allocate raw_edid.\n"); 465 return -ENOMEM; 466 } 467 } else { 468 /* 469 * with connection = 0, free raw_edid 470 * only if raw edid data isn't same as fake data. 471 */ 472 if (ctx->raw_edid && ctx->raw_edid != 473 (struct edid *)fake_edid_info) { 474 kfree(ctx->raw_edid); 475 ctx->raw_edid = NULL; 476 } 477 } 478 479 ctx->connected = vidi->connection; 480 drm_helper_hpd_irq_event(ctx->drm_dev); 481 482 return 0; 483 } 484 485 static enum drm_connector_status vidi_detect(struct drm_connector *connector, 486 bool force) 487 { 488 struct vidi_context *ctx = ctx_from_connector(connector); 489 490 /* 491 * connection request would come from user side 492 * to do hotplug through specific ioctl. 493 */ 494 return ctx->connected ? connector_status_connected : 495 connector_status_disconnected; 496 } 497 498 static void vidi_connector_destroy(struct drm_connector *connector) 499 { 500 } 501 502 static struct drm_connector_funcs vidi_connector_funcs = { 503 .dpms = drm_helper_connector_dpms, 504 .fill_modes = drm_helper_probe_single_connector_modes, 505 .detect = vidi_detect, 506 .destroy = vidi_connector_destroy, 507 }; 508 509 static int vidi_get_modes(struct drm_connector *connector) 510 { 511 struct vidi_context *ctx = ctx_from_connector(connector); 512 struct edid *edid; 513 int edid_len; 514 515 /* 516 * the edid data comes from user side and it would be set 517 * to ctx->raw_edid through specific ioctl. 518 */ 519 if (!ctx->raw_edid) { 520 DRM_DEBUG_KMS("raw_edid is null.\n"); 521 return -EFAULT; 522 } 523 524 edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH; 525 edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL); 526 if (!edid) { 527 DRM_DEBUG_KMS("failed to allocate edid\n"); 528 return -ENOMEM; 529 } 530 531 drm_mode_connector_update_edid_property(connector, edid); 532 533 return drm_add_edid_modes(connector, edid); 534 } 535 536 static int vidi_mode_valid(struct drm_connector *connector, 537 struct drm_display_mode *mode) 538 { 539 return MODE_OK; 540 } 541 542 static struct drm_encoder *vidi_best_encoder(struct drm_connector *connector) 543 { 544 struct vidi_context *ctx = ctx_from_connector(connector); 545 546 return ctx->encoder; 547 } 548 549 static struct drm_connector_helper_funcs vidi_connector_helper_funcs = { 550 .get_modes = vidi_get_modes, 551 .mode_valid = vidi_mode_valid, 552 .best_encoder = vidi_best_encoder, 553 }; 554 555 static int vidi_create_connector(struct exynos_drm_display *display, 556 struct drm_encoder *encoder) 557 { 558 struct vidi_context *ctx = display->ctx; 559 struct drm_connector *connector = &ctx->connector; 560 int ret; 561 562 ctx->encoder = encoder; 563 connector->polled = DRM_CONNECTOR_POLL_HPD; 564 565 ret = drm_connector_init(ctx->drm_dev, connector, 566 &vidi_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL); 567 if (ret) { 568 DRM_ERROR("Failed to initialize connector with drm\n"); 569 return ret; 570 } 571 572 drm_connector_helper_add(connector, &vidi_connector_helper_funcs); 573 drm_sysfs_connector_add(connector); 574 drm_mode_connector_attach_encoder(connector, encoder); 575 576 return 0; 577 } 578 579 580 static struct exynos_drm_display_ops vidi_display_ops = { 581 .create_connector = vidi_create_connector, 582 }; 583 584 static struct exynos_drm_display vidi_display = { 585 .type = EXYNOS_DISPLAY_TYPE_VIDI, 586 .ops = &vidi_display_ops, 587 }; 588 589 static int vidi_probe(struct platform_device *pdev) 590 { 591 struct device *dev = &pdev->dev; 592 struct vidi_context *ctx; 593 int ret; 594 595 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); 596 if (!ctx) 597 return -ENOMEM; 598 599 ctx->default_win = 0; 600 601 INIT_WORK(&ctx->work, vidi_fake_vblank_handler); 602 603 vidi_manager.ctx = ctx; 604 vidi_display.ctx = ctx; 605 606 mutex_init(&ctx->lock); 607 608 platform_set_drvdata(pdev, &vidi_manager); 609 610 ret = device_create_file(dev, &dev_attr_connection); 611 if (ret < 0) 612 DRM_INFO("failed to create connection sysfs.\n"); 613 614 exynos_drm_manager_register(&vidi_manager); 615 exynos_drm_display_register(&vidi_display); 616 617 return 0; 618 } 619 620 static int vidi_remove(struct platform_device *pdev) 621 { 622 struct vidi_context *ctx = platform_get_drvdata(pdev); 623 624 exynos_drm_display_unregister(&vidi_display); 625 exynos_drm_manager_unregister(&vidi_manager); 626 627 if (ctx->raw_edid != (struct edid *)fake_edid_info) { 628 kfree(ctx->raw_edid); 629 ctx->raw_edid = NULL; 630 } 631 632 return 0; 633 } 634 635 struct platform_driver vidi_driver = { 636 .probe = vidi_probe, 637 .remove = vidi_remove, 638 .driver = { 639 .name = "exynos-drm-vidi", 640 .owner = THIS_MODULE, 641 }, 642 }; 643