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