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 }; 628