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 27 /* vidi has totally three virtual windows. */ 28 #define WINDOWS_NR 3 29 30 #define get_vidi_context(dev) platform_get_drvdata(to_platform_device(dev)) 31 32 struct vidi_win_data { 33 unsigned int offset_x; 34 unsigned int offset_y; 35 unsigned int ovl_width; 36 unsigned int ovl_height; 37 unsigned int fb_width; 38 unsigned int fb_height; 39 unsigned int bpp; 40 dma_addr_t dma_addr; 41 unsigned int buf_offsize; 42 unsigned int line_size; /* bytes */ 43 bool enabled; 44 }; 45 46 struct vidi_context { 47 struct exynos_drm_subdrv subdrv; 48 struct drm_crtc *crtc; 49 struct vidi_win_data win_data[WINDOWS_NR]; 50 struct edid *raw_edid; 51 unsigned int clkdiv; 52 unsigned int default_win; 53 unsigned long irq_flags; 54 unsigned int connected; 55 bool vblank_on; 56 bool suspended; 57 bool direct_vblank; 58 struct work_struct work; 59 struct mutex lock; 60 }; 61 62 static const char fake_edid_info[] = { 63 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x4c, 0x2d, 0x05, 0x05, 64 0x00, 0x00, 0x00, 0x00, 0x30, 0x12, 0x01, 0x03, 0x80, 0x10, 0x09, 0x78, 65 0x0a, 0xee, 0x91, 0xa3, 0x54, 0x4c, 0x99, 0x26, 0x0f, 0x50, 0x54, 0xbd, 66 0xee, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 67 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xb0, 0x51, 0x00, 68 0x1b, 0x30, 0x40, 0x70, 0x36, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 69 0x01, 0x1d, 0x00, 0x72, 0x51, 0xd0, 0x1e, 0x20, 0x6e, 0x28, 0x55, 0x00, 70 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18, 71 0x4b, 0x1a, 0x44, 0x17, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 72 0x00, 0x00, 0x00, 0xfc, 0x00, 0x53, 0x41, 0x4d, 0x53, 0x55, 0x4e, 0x47, 73 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0xbc, 0x02, 0x03, 0x1e, 0xf1, 74 0x46, 0x84, 0x05, 0x03, 0x10, 0x20, 0x22, 0x23, 0x09, 0x07, 0x07, 0x83, 75 0x01, 0x00, 0x00, 0xe2, 0x00, 0x0f, 0x67, 0x03, 0x0c, 0x00, 0x10, 0x00, 76 0xb8, 0x2d, 0x01, 0x1d, 0x80, 0x18, 0x71, 0x1c, 0x16, 0x20, 0x58, 0x2c, 77 0x25, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x9e, 0x8c, 0x0a, 0xd0, 0x8a, 78 0x20, 0xe0, 0x2d, 0x10, 0x10, 0x3e, 0x96, 0x00, 0xa0, 0x5a, 0x00, 0x00, 79 0x00, 0x18, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c, 80 0x45, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0x00, 81 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 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, 0x06 85 }; 86 87 static bool vidi_display_is_connected(struct device *dev) 88 { 89 struct vidi_context *ctx = get_vidi_context(dev); 90 91 /* 92 * connection request would come from user side 93 * to do hotplug through specific ioctl. 94 */ 95 return ctx->connected ? true : false; 96 } 97 98 static struct edid *vidi_get_edid(struct device *dev, 99 struct drm_connector *connector) 100 { 101 struct vidi_context *ctx = get_vidi_context(dev); 102 struct edid *edid; 103 int edid_len; 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_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH; 115 edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL); 116 if (!edid) { 117 DRM_DEBUG_KMS("failed to allocate edid\n"); 118 return ERR_PTR(-ENOMEM); 119 } 120 121 return edid; 122 } 123 124 static void *vidi_get_panel(struct device *dev) 125 { 126 /* TODO. */ 127 128 return NULL; 129 } 130 131 static int vidi_check_mode(struct device *dev, struct drm_display_mode *mode) 132 { 133 /* TODO. */ 134 135 return 0; 136 } 137 138 static int vidi_display_power_on(struct device *dev, int mode) 139 { 140 /* TODO */ 141 142 return 0; 143 } 144 145 static struct exynos_drm_display_ops vidi_display_ops = { 146 .type = EXYNOS_DISPLAY_TYPE_VIDI, 147 .is_connected = vidi_display_is_connected, 148 .get_edid = vidi_get_edid, 149 .get_panel = vidi_get_panel, 150 .check_mode = vidi_check_mode, 151 .power_on = vidi_display_power_on, 152 }; 153 154 static void vidi_dpms(struct device *subdrv_dev, int mode) 155 { 156 struct vidi_context *ctx = get_vidi_context(subdrv_dev); 157 158 DRM_DEBUG_KMS("%d\n", mode); 159 160 mutex_lock(&ctx->lock); 161 162 switch (mode) { 163 case DRM_MODE_DPMS_ON: 164 /* TODO. */ 165 break; 166 case DRM_MODE_DPMS_STANDBY: 167 case DRM_MODE_DPMS_SUSPEND: 168 case DRM_MODE_DPMS_OFF: 169 /* TODO. */ 170 break; 171 default: 172 DRM_DEBUG_KMS("unspecified mode %d\n", mode); 173 break; 174 } 175 176 mutex_unlock(&ctx->lock); 177 } 178 179 static void vidi_apply(struct device *subdrv_dev) 180 { 181 struct vidi_context *ctx = get_vidi_context(subdrv_dev); 182 struct exynos_drm_manager *mgr = ctx->subdrv.manager; 183 struct exynos_drm_manager_ops *mgr_ops = mgr->ops; 184 struct exynos_drm_overlay_ops *ovl_ops = mgr->overlay_ops; 185 struct vidi_win_data *win_data; 186 int i; 187 188 for (i = 0; i < WINDOWS_NR; i++) { 189 win_data = &ctx->win_data[i]; 190 if (win_data->enabled && (ovl_ops && ovl_ops->commit)) 191 ovl_ops->commit(subdrv_dev, i); 192 } 193 194 if (mgr_ops && mgr_ops->commit) 195 mgr_ops->commit(subdrv_dev); 196 } 197 198 static void vidi_commit(struct device *dev) 199 { 200 struct vidi_context *ctx = get_vidi_context(dev); 201 202 if (ctx->suspended) 203 return; 204 } 205 206 static int vidi_enable_vblank(struct device *dev) 207 { 208 struct vidi_context *ctx = get_vidi_context(dev); 209 210 if (ctx->suspended) 211 return -EPERM; 212 213 if (!test_and_set_bit(0, &ctx->irq_flags)) 214 ctx->vblank_on = true; 215 216 ctx->direct_vblank = true; 217 218 /* 219 * in case of page flip request, vidi_finish_pageflip function 220 * will not be called because direct_vblank is true and then 221 * that function will be called by overlay_ops->commit callback 222 */ 223 schedule_work(&ctx->work); 224 225 return 0; 226 } 227 228 static void vidi_disable_vblank(struct device *dev) 229 { 230 struct vidi_context *ctx = get_vidi_context(dev); 231 232 if (ctx->suspended) 233 return; 234 235 if (test_and_clear_bit(0, &ctx->irq_flags)) 236 ctx->vblank_on = false; 237 } 238 239 static struct exynos_drm_manager_ops vidi_manager_ops = { 240 .dpms = vidi_dpms, 241 .apply = vidi_apply, 242 .commit = vidi_commit, 243 .enable_vblank = vidi_enable_vblank, 244 .disable_vblank = vidi_disable_vblank, 245 }; 246 247 static void vidi_win_mode_set(struct device *dev, 248 struct exynos_drm_overlay *overlay) 249 { 250 struct vidi_context *ctx = get_vidi_context(dev); 251 struct vidi_win_data *win_data; 252 int win; 253 unsigned long offset; 254 255 if (!overlay) { 256 dev_err(dev, "overlay is NULL\n"); 257 return; 258 } 259 260 win = overlay->zpos; 261 if (win == DEFAULT_ZPOS) 262 win = ctx->default_win; 263 264 if (win < 0 || win >= WINDOWS_NR) 265 return; 266 267 offset = overlay->fb_x * (overlay->bpp >> 3); 268 offset += overlay->fb_y * overlay->pitch; 269 270 DRM_DEBUG_KMS("offset = 0x%lx, pitch = %x\n", offset, overlay->pitch); 271 272 win_data = &ctx->win_data[win]; 273 274 win_data->offset_x = overlay->crtc_x; 275 win_data->offset_y = overlay->crtc_y; 276 win_data->ovl_width = overlay->crtc_width; 277 win_data->ovl_height = overlay->crtc_height; 278 win_data->fb_width = overlay->fb_width; 279 win_data->fb_height = overlay->fb_height; 280 win_data->dma_addr = overlay->dma_addr[0] + offset; 281 win_data->bpp = overlay->bpp; 282 win_data->buf_offsize = (overlay->fb_width - overlay->crtc_width) * 283 (overlay->bpp >> 3); 284 win_data->line_size = overlay->crtc_width * (overlay->bpp >> 3); 285 286 /* 287 * some parts of win_data should be transferred to user side 288 * through specific ioctl. 289 */ 290 291 DRM_DEBUG_KMS("offset_x = %d, offset_y = %d\n", 292 win_data->offset_x, win_data->offset_y); 293 DRM_DEBUG_KMS("ovl_width = %d, ovl_height = %d\n", 294 win_data->ovl_width, win_data->ovl_height); 295 DRM_DEBUG_KMS("paddr = 0x%lx\n", (unsigned long)win_data->dma_addr); 296 DRM_DEBUG_KMS("fb_width = %d, crtc_width = %d\n", 297 overlay->fb_width, overlay->crtc_width); 298 } 299 300 static void vidi_win_commit(struct device *dev, int zpos) 301 { 302 struct vidi_context *ctx = get_vidi_context(dev); 303 struct vidi_win_data *win_data; 304 int win = zpos; 305 306 if (ctx->suspended) 307 return; 308 309 if (win == DEFAULT_ZPOS) 310 win = ctx->default_win; 311 312 if (win < 0 || win >= WINDOWS_NR) 313 return; 314 315 win_data = &ctx->win_data[win]; 316 317 win_data->enabled = true; 318 319 DRM_DEBUG_KMS("dma_addr = 0x%x\n", win_data->dma_addr); 320 321 if (ctx->vblank_on) 322 schedule_work(&ctx->work); 323 } 324 325 static void vidi_win_disable(struct device *dev, int zpos) 326 { 327 struct vidi_context *ctx = get_vidi_context(dev); 328 struct vidi_win_data *win_data; 329 int win = zpos; 330 331 if (win == DEFAULT_ZPOS) 332 win = ctx->default_win; 333 334 if (win < 0 || win >= WINDOWS_NR) 335 return; 336 337 win_data = &ctx->win_data[win]; 338 win_data->enabled = false; 339 340 /* TODO. */ 341 } 342 343 static struct exynos_drm_overlay_ops vidi_overlay_ops = { 344 .mode_set = vidi_win_mode_set, 345 .commit = vidi_win_commit, 346 .disable = vidi_win_disable, 347 }; 348 349 static struct exynos_drm_manager vidi_manager = { 350 .pipe = -1, 351 .ops = &vidi_manager_ops, 352 .overlay_ops = &vidi_overlay_ops, 353 .display_ops = &vidi_display_ops, 354 }; 355 356 static void vidi_fake_vblank_handler(struct work_struct *work) 357 { 358 struct vidi_context *ctx = container_of(work, struct vidi_context, 359 work); 360 struct exynos_drm_subdrv *subdrv = &ctx->subdrv; 361 struct exynos_drm_manager *manager = subdrv->manager; 362 363 if (manager->pipe < 0) 364 return; 365 366 /* refresh rate is about 50Hz. */ 367 usleep_range(16000, 20000); 368 369 mutex_lock(&ctx->lock); 370 371 if (ctx->direct_vblank) { 372 drm_handle_vblank(subdrv->drm_dev, manager->pipe); 373 ctx->direct_vblank = false; 374 mutex_unlock(&ctx->lock); 375 return; 376 } 377 378 mutex_unlock(&ctx->lock); 379 380 exynos_drm_crtc_finish_pageflip(subdrv->drm_dev, manager->pipe); 381 } 382 383 static int vidi_subdrv_probe(struct drm_device *drm_dev, struct device *dev) 384 { 385 /* 386 * enable drm irq mode. 387 * - with irq_enabled = 1, we can use the vblank feature. 388 * 389 * P.S. note that we wouldn't use drm irq handler but 390 * just specific driver own one instead because 391 * drm framework supports only one irq handler. 392 */ 393 drm_dev->irq_enabled = 1; 394 395 /* 396 * with vblank_disable_allowed = 1, vblank interrupt will be disabled 397 * by drm timer once a current process gives up ownership of 398 * vblank event.(after drm_vblank_put function is called) 399 */ 400 drm_dev->vblank_disable_allowed = 1; 401 402 return 0; 403 } 404 405 static void vidi_subdrv_remove(struct drm_device *drm_dev, struct device *dev) 406 { 407 /* TODO. */ 408 } 409 410 static int vidi_power_on(struct vidi_context *ctx, bool enable) 411 { 412 struct exynos_drm_subdrv *subdrv = &ctx->subdrv; 413 struct device *dev = subdrv->dev; 414 415 if (enable) { 416 ctx->suspended = false; 417 418 /* if vblank was enabled status, enable it again. */ 419 if (test_and_clear_bit(0, &ctx->irq_flags)) 420 vidi_enable_vblank(dev); 421 422 vidi_apply(dev); 423 } else { 424 ctx->suspended = true; 425 } 426 427 return 0; 428 } 429 430 static int vidi_show_connection(struct device *dev, 431 struct device_attribute *attr, char *buf) 432 { 433 int rc; 434 struct vidi_context *ctx = get_vidi_context(dev); 435 436 mutex_lock(&ctx->lock); 437 438 rc = sprintf(buf, "%d\n", ctx->connected); 439 440 mutex_unlock(&ctx->lock); 441 442 return rc; 443 } 444 445 static int vidi_store_connection(struct device *dev, 446 struct device_attribute *attr, 447 const char *buf, size_t len) 448 { 449 struct vidi_context *ctx = get_vidi_context(dev); 450 int ret; 451 452 ret = kstrtoint(buf, 0, &ctx->connected); 453 if (ret) 454 return ret; 455 456 if (ctx->connected > 1) 457 return -EINVAL; 458 459 /* use fake edid data for test. */ 460 if (!ctx->raw_edid) 461 ctx->raw_edid = (struct edid *)fake_edid_info; 462 463 /* if raw_edid isn't same as fake data then it can't be tested. */ 464 if (ctx->raw_edid != (struct edid *)fake_edid_info) { 465 DRM_DEBUG_KMS("edid data is not fake data.\n"); 466 return -EINVAL; 467 } 468 469 DRM_DEBUG_KMS("requested connection.\n"); 470 471 drm_helper_hpd_irq_event(ctx->subdrv.drm_dev); 472 473 return len; 474 } 475 476 static DEVICE_ATTR(connection, 0644, vidi_show_connection, 477 vidi_store_connection); 478 479 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data, 480 struct drm_file *file_priv) 481 { 482 struct vidi_context *ctx = NULL; 483 struct drm_encoder *encoder; 484 struct exynos_drm_manager *manager; 485 struct exynos_drm_display_ops *display_ops; 486 struct drm_exynos_vidi_connection *vidi = data; 487 int edid_len; 488 489 if (!vidi) { 490 DRM_DEBUG_KMS("user data for vidi is null.\n"); 491 return -EINVAL; 492 } 493 494 if (vidi->connection > 1) { 495 DRM_DEBUG_KMS("connection should be 0 or 1.\n"); 496 return -EINVAL; 497 } 498 499 list_for_each_entry(encoder, &drm_dev->mode_config.encoder_list, 500 head) { 501 manager = exynos_drm_get_manager(encoder); 502 display_ops = manager->display_ops; 503 504 if (display_ops->type == EXYNOS_DISPLAY_TYPE_VIDI) { 505 ctx = get_vidi_context(manager->dev); 506 break; 507 } 508 } 509 510 if (!ctx) { 511 DRM_DEBUG_KMS("not found virtual device type encoder.\n"); 512 return -EINVAL; 513 } 514 515 if (ctx->connected == vidi->connection) { 516 DRM_DEBUG_KMS("same connection request.\n"); 517 return -EINVAL; 518 } 519 520 if (vidi->connection) { 521 struct edid *raw_edid = (struct edid *)(uint32_t)vidi->edid; 522 if (!drm_edid_is_valid(raw_edid)) { 523 DRM_DEBUG_KMS("edid data is invalid.\n"); 524 return -EINVAL; 525 } 526 edid_len = (1 + raw_edid->extensions) * EDID_LENGTH; 527 ctx->raw_edid = kmemdup(raw_edid, edid_len, GFP_KERNEL); 528 if (!ctx->raw_edid) { 529 DRM_DEBUG_KMS("failed to allocate raw_edid.\n"); 530 return -ENOMEM; 531 } 532 } else { 533 /* 534 * with connection = 0, free raw_edid 535 * only if raw edid data isn't same as fake data. 536 */ 537 if (ctx->raw_edid && ctx->raw_edid != 538 (struct edid *)fake_edid_info) { 539 kfree(ctx->raw_edid); 540 ctx->raw_edid = NULL; 541 } 542 } 543 544 ctx->connected = vidi->connection; 545 drm_helper_hpd_irq_event(ctx->subdrv.drm_dev); 546 547 return 0; 548 } 549 550 static int vidi_probe(struct platform_device *pdev) 551 { 552 struct device *dev = &pdev->dev; 553 struct vidi_context *ctx; 554 struct exynos_drm_subdrv *subdrv; 555 int ret; 556 557 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); 558 if (!ctx) 559 return -ENOMEM; 560 561 ctx->default_win = 0; 562 563 INIT_WORK(&ctx->work, vidi_fake_vblank_handler); 564 565 subdrv = &ctx->subdrv; 566 subdrv->dev = dev; 567 subdrv->manager = &vidi_manager; 568 subdrv->probe = vidi_subdrv_probe; 569 subdrv->remove = vidi_subdrv_remove; 570 571 mutex_init(&ctx->lock); 572 573 platform_set_drvdata(pdev, ctx); 574 575 ret = device_create_file(dev, &dev_attr_connection); 576 if (ret < 0) 577 DRM_INFO("failed to create connection sysfs.\n"); 578 579 exynos_drm_subdrv_register(subdrv); 580 581 return 0; 582 } 583 584 static int vidi_remove(struct platform_device *pdev) 585 { 586 struct vidi_context *ctx = platform_get_drvdata(pdev); 587 588 exynos_drm_subdrv_unregister(&ctx->subdrv); 589 590 if (ctx->raw_edid != (struct edid *)fake_edid_info) { 591 kfree(ctx->raw_edid); 592 ctx->raw_edid = NULL; 593 } 594 595 return 0; 596 } 597 598 #ifdef CONFIG_PM_SLEEP 599 static int vidi_suspend(struct device *dev) 600 { 601 struct vidi_context *ctx = get_vidi_context(dev); 602 603 return vidi_power_on(ctx, false); 604 } 605 606 static int vidi_resume(struct device *dev) 607 { 608 struct vidi_context *ctx = get_vidi_context(dev); 609 610 return vidi_power_on(ctx, true); 611 } 612 #endif 613 614 static const struct dev_pm_ops vidi_pm_ops = { 615 SET_SYSTEM_SLEEP_PM_OPS(vidi_suspend, vidi_resume) 616 }; 617 618 struct platform_driver vidi_driver = { 619 .probe = vidi_probe, 620 .remove = vidi_remove, 621 .driver = { 622 .name = "exynos-drm-vidi", 623 .owner = THIS_MODULE, 624 .pm = &vidi_pm_ops, 625 }, 626 }; 627