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 #include <linux/component.h> 18 19 #include <drm/exynos_drm.h> 20 21 #include <drm/drm_edid.h> 22 #include <drm/drm_crtc_helper.h> 23 #include <drm/drm_atomic_helper.h> 24 25 #include "exynos_drm_drv.h" 26 #include "exynos_drm_crtc.h" 27 #include "exynos_drm_plane.h" 28 #include "exynos_drm_encoder.h" 29 #include "exynos_drm_vidi.h" 30 31 /* vidi has totally three virtual windows. */ 32 #define WINDOWS_NR 3 33 34 #define ctx_from_connector(c) container_of(c, struct vidi_context, \ 35 connector) 36 37 struct vidi_context { 38 struct exynos_drm_display display; 39 struct platform_device *pdev; 40 struct drm_device *drm_dev; 41 struct exynos_drm_crtc *crtc; 42 struct drm_encoder *encoder; 43 struct drm_connector connector; 44 struct exynos_drm_plane planes[WINDOWS_NR]; 45 struct edid *raw_edid; 46 unsigned int clkdiv; 47 unsigned int default_win; 48 unsigned long irq_flags; 49 unsigned int connected; 50 bool vblank_on; 51 bool suspended; 52 bool direct_vblank; 53 struct work_struct work; 54 struct mutex lock; 55 int pipe; 56 }; 57 58 static inline struct vidi_context *display_to_vidi(struct exynos_drm_display *d) 59 { 60 return container_of(d, struct vidi_context, display); 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 int vidi_enable_vblank(struct exynos_drm_crtc *crtc) 89 { 90 struct vidi_context *ctx = crtc->ctx; 91 92 if (ctx->suspended) 93 return -EPERM; 94 95 if (!test_and_set_bit(0, &ctx->irq_flags)) 96 ctx->vblank_on = true; 97 98 ctx->direct_vblank = true; 99 100 /* 101 * in case of page flip request, vidi_finish_pageflip function 102 * will not be called because direct_vblank is true and then 103 * that function will be called by crtc_ops->win_commit callback 104 */ 105 schedule_work(&ctx->work); 106 107 return 0; 108 } 109 110 static void vidi_disable_vblank(struct exynos_drm_crtc *crtc) 111 { 112 struct vidi_context *ctx = crtc->ctx; 113 114 if (ctx->suspended) 115 return; 116 117 if (test_and_clear_bit(0, &ctx->irq_flags)) 118 ctx->vblank_on = false; 119 } 120 121 static void vidi_win_commit(struct exynos_drm_crtc *crtc, unsigned int win) 122 { 123 struct vidi_context *ctx = crtc->ctx; 124 struct exynos_drm_plane *plane; 125 126 if (ctx->suspended) 127 return; 128 129 if (win < 0 || win >= WINDOWS_NR) 130 return; 131 132 plane = &ctx->planes[win]; 133 134 DRM_DEBUG_KMS("dma_addr = %pad\n", plane->dma_addr); 135 136 if (ctx->vblank_on) 137 schedule_work(&ctx->work); 138 } 139 140 static void vidi_enable(struct exynos_drm_crtc *crtc) 141 { 142 struct vidi_context *ctx = crtc->ctx; 143 144 mutex_lock(&ctx->lock); 145 146 ctx->suspended = false; 147 148 /* if vblank was enabled status, enable it again. */ 149 if (test_and_clear_bit(0, &ctx->irq_flags)) 150 vidi_enable_vblank(ctx->crtc); 151 152 mutex_unlock(&ctx->lock); 153 } 154 155 static void vidi_disable(struct exynos_drm_crtc *crtc) 156 { 157 struct vidi_context *ctx = crtc->ctx; 158 159 mutex_lock(&ctx->lock); 160 161 ctx->suspended = true; 162 163 mutex_unlock(&ctx->lock); 164 } 165 166 static int vidi_ctx_initialize(struct vidi_context *ctx, 167 struct drm_device *drm_dev) 168 { 169 struct exynos_drm_private *priv = drm_dev->dev_private; 170 171 ctx->drm_dev = drm_dev; 172 ctx->pipe = priv->pipe++; 173 174 return 0; 175 } 176 177 static const struct exynos_drm_crtc_ops vidi_crtc_ops = { 178 .enable = vidi_enable, 179 .disable = vidi_disable, 180 .enable_vblank = vidi_enable_vblank, 181 .disable_vblank = vidi_disable_vblank, 182 .win_commit = vidi_win_commit, 183 }; 184 185 static void vidi_fake_vblank_handler(struct work_struct *work) 186 { 187 struct vidi_context *ctx = container_of(work, struct vidi_context, 188 work); 189 190 if (ctx->pipe < 0) 191 return; 192 193 /* refresh rate is about 50Hz. */ 194 usleep_range(16000, 20000); 195 196 mutex_lock(&ctx->lock); 197 198 if (ctx->direct_vblank) { 199 drm_handle_vblank(ctx->drm_dev, ctx->pipe); 200 ctx->direct_vblank = false; 201 mutex_unlock(&ctx->lock); 202 return; 203 } 204 205 mutex_unlock(&ctx->lock); 206 207 exynos_drm_crtc_finish_pageflip(ctx->drm_dev, ctx->pipe); 208 } 209 210 static int vidi_show_connection(struct device *dev, 211 struct device_attribute *attr, char *buf) 212 { 213 struct vidi_context *ctx = dev_get_drvdata(dev); 214 int rc; 215 216 mutex_lock(&ctx->lock); 217 218 rc = sprintf(buf, "%d\n", ctx->connected); 219 220 mutex_unlock(&ctx->lock); 221 222 return rc; 223 } 224 225 static int vidi_store_connection(struct device *dev, 226 struct device_attribute *attr, 227 const char *buf, size_t len) 228 { 229 struct vidi_context *ctx = dev_get_drvdata(dev); 230 int ret; 231 232 ret = kstrtoint(buf, 0, &ctx->connected); 233 if (ret) 234 return ret; 235 236 if (ctx->connected > 1) 237 return -EINVAL; 238 239 /* use fake edid data for test. */ 240 if (!ctx->raw_edid) 241 ctx->raw_edid = (struct edid *)fake_edid_info; 242 243 /* if raw_edid isn't same as fake data then it can't be tested. */ 244 if (ctx->raw_edid != (struct edid *)fake_edid_info) { 245 DRM_DEBUG_KMS("edid data is not fake data.\n"); 246 return -EINVAL; 247 } 248 249 DRM_DEBUG_KMS("requested connection.\n"); 250 251 drm_helper_hpd_irq_event(ctx->drm_dev); 252 253 return len; 254 } 255 256 static DEVICE_ATTR(connection, 0644, vidi_show_connection, 257 vidi_store_connection); 258 259 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data, 260 struct drm_file *file_priv) 261 { 262 struct vidi_context *ctx = NULL; 263 struct drm_encoder *encoder; 264 struct exynos_drm_display *display; 265 struct drm_exynos_vidi_connection *vidi = data; 266 267 if (!vidi) { 268 DRM_DEBUG_KMS("user data for vidi is null.\n"); 269 return -EINVAL; 270 } 271 272 if (vidi->connection > 1) { 273 DRM_DEBUG_KMS("connection should be 0 or 1.\n"); 274 return -EINVAL; 275 } 276 277 list_for_each_entry(encoder, &drm_dev->mode_config.encoder_list, 278 head) { 279 display = exynos_drm_get_display(encoder); 280 281 if (display->type == EXYNOS_DISPLAY_TYPE_VIDI) { 282 ctx = display_to_vidi(display); 283 break; 284 } 285 } 286 287 if (!ctx) { 288 DRM_DEBUG_KMS("not found virtual device type encoder.\n"); 289 return -EINVAL; 290 } 291 292 if (ctx->connected == vidi->connection) { 293 DRM_DEBUG_KMS("same connection request.\n"); 294 return -EINVAL; 295 } 296 297 if (vidi->connection) { 298 struct edid *raw_edid = (struct edid *)(uint32_t)vidi->edid; 299 if (!drm_edid_is_valid(raw_edid)) { 300 DRM_DEBUG_KMS("edid data is invalid.\n"); 301 return -EINVAL; 302 } 303 ctx->raw_edid = drm_edid_duplicate(raw_edid); 304 if (!ctx->raw_edid) { 305 DRM_DEBUG_KMS("failed to allocate raw_edid.\n"); 306 return -ENOMEM; 307 } 308 } else { 309 /* 310 * with connection = 0, free raw_edid 311 * only if raw edid data isn't same as fake data. 312 */ 313 if (ctx->raw_edid && ctx->raw_edid != 314 (struct edid *)fake_edid_info) { 315 kfree(ctx->raw_edid); 316 ctx->raw_edid = NULL; 317 } 318 } 319 320 ctx->connected = vidi->connection; 321 drm_helper_hpd_irq_event(ctx->drm_dev); 322 323 return 0; 324 } 325 326 static enum drm_connector_status vidi_detect(struct drm_connector *connector, 327 bool force) 328 { 329 struct vidi_context *ctx = ctx_from_connector(connector); 330 331 /* 332 * connection request would come from user side 333 * to do hotplug through specific ioctl. 334 */ 335 return ctx->connected ? connector_status_connected : 336 connector_status_disconnected; 337 } 338 339 static void vidi_connector_destroy(struct drm_connector *connector) 340 { 341 } 342 343 static struct drm_connector_funcs vidi_connector_funcs = { 344 .dpms = drm_atomic_helper_connector_dpms, 345 .fill_modes = drm_helper_probe_single_connector_modes, 346 .detect = vidi_detect, 347 .destroy = vidi_connector_destroy, 348 .reset = drm_atomic_helper_connector_reset, 349 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 350 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 351 }; 352 353 static int vidi_get_modes(struct drm_connector *connector) 354 { 355 struct vidi_context *ctx = ctx_from_connector(connector); 356 struct edid *edid; 357 int edid_len; 358 359 /* 360 * the edid data comes from user side and it would be set 361 * to ctx->raw_edid through specific ioctl. 362 */ 363 if (!ctx->raw_edid) { 364 DRM_DEBUG_KMS("raw_edid is null.\n"); 365 return -EFAULT; 366 } 367 368 edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH; 369 edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL); 370 if (!edid) { 371 DRM_DEBUG_KMS("failed to allocate edid\n"); 372 return -ENOMEM; 373 } 374 375 drm_mode_connector_update_edid_property(connector, edid); 376 377 return drm_add_edid_modes(connector, edid); 378 } 379 380 static struct drm_encoder *vidi_best_encoder(struct drm_connector *connector) 381 { 382 struct vidi_context *ctx = ctx_from_connector(connector); 383 384 return ctx->encoder; 385 } 386 387 static struct drm_connector_helper_funcs vidi_connector_helper_funcs = { 388 .get_modes = vidi_get_modes, 389 .best_encoder = vidi_best_encoder, 390 }; 391 392 static int vidi_create_connector(struct exynos_drm_display *display, 393 struct drm_encoder *encoder) 394 { 395 struct vidi_context *ctx = display_to_vidi(display); 396 struct drm_connector *connector = &ctx->connector; 397 int ret; 398 399 ctx->encoder = encoder; 400 connector->polled = DRM_CONNECTOR_POLL_HPD; 401 402 ret = drm_connector_init(ctx->drm_dev, connector, 403 &vidi_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL); 404 if (ret) { 405 DRM_ERROR("Failed to initialize connector with drm\n"); 406 return ret; 407 } 408 409 drm_connector_helper_add(connector, &vidi_connector_helper_funcs); 410 drm_connector_register(connector); 411 drm_mode_connector_attach_encoder(connector, encoder); 412 413 return 0; 414 } 415 416 417 static struct exynos_drm_display_ops vidi_display_ops = { 418 .create_connector = vidi_create_connector, 419 }; 420 421 static int vidi_bind(struct device *dev, struct device *master, void *data) 422 { 423 struct vidi_context *ctx = dev_get_drvdata(dev); 424 struct drm_device *drm_dev = data; 425 struct exynos_drm_plane *exynos_plane; 426 enum drm_plane_type type; 427 unsigned int zpos; 428 int ret; 429 430 vidi_ctx_initialize(ctx, drm_dev); 431 432 for (zpos = 0; zpos < WINDOWS_NR; zpos++) { 433 type = (zpos == ctx->default_win) ? DRM_PLANE_TYPE_PRIMARY : 434 DRM_PLANE_TYPE_OVERLAY; 435 ret = exynos_plane_init(drm_dev, &ctx->planes[zpos], 436 1 << ctx->pipe, type, zpos); 437 if (ret) 438 return ret; 439 } 440 441 exynos_plane = &ctx->planes[ctx->default_win]; 442 ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base, 443 ctx->pipe, EXYNOS_DISPLAY_TYPE_VIDI, 444 &vidi_crtc_ops, ctx); 445 if (IS_ERR(ctx->crtc)) { 446 DRM_ERROR("failed to create crtc.\n"); 447 return PTR_ERR(ctx->crtc); 448 } 449 450 ret = exynos_drm_create_enc_conn(drm_dev, &ctx->display); 451 if (ret) { 452 ctx->crtc->base.funcs->destroy(&ctx->crtc->base); 453 return ret; 454 } 455 456 return 0; 457 } 458 459 460 static void vidi_unbind(struct device *dev, struct device *master, void *data) 461 { 462 } 463 464 static const struct component_ops vidi_component_ops = { 465 .bind = vidi_bind, 466 .unbind = vidi_unbind, 467 }; 468 469 static int vidi_probe(struct platform_device *pdev) 470 { 471 struct vidi_context *ctx; 472 int ret; 473 474 ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL); 475 if (!ctx) 476 return -ENOMEM; 477 478 ctx->display.type = EXYNOS_DISPLAY_TYPE_VIDI; 479 ctx->display.ops = &vidi_display_ops; 480 ctx->default_win = 0; 481 ctx->pdev = pdev; 482 483 INIT_WORK(&ctx->work, vidi_fake_vblank_handler); 484 485 mutex_init(&ctx->lock); 486 487 platform_set_drvdata(pdev, ctx); 488 489 ret = device_create_file(&pdev->dev, &dev_attr_connection); 490 if (ret < 0) { 491 DRM_ERROR("failed to create connection sysfs.\n"); 492 return ret; 493 } 494 495 ret = component_add(&pdev->dev, &vidi_component_ops); 496 if (ret) 497 goto err_remove_file; 498 499 return ret; 500 501 err_remove_file: 502 device_remove_file(&pdev->dev, &dev_attr_connection); 503 504 return ret; 505 } 506 507 static int vidi_remove(struct platform_device *pdev) 508 { 509 struct vidi_context *ctx = platform_get_drvdata(pdev); 510 511 if (ctx->raw_edid != (struct edid *)fake_edid_info) { 512 kfree(ctx->raw_edid); 513 ctx->raw_edid = NULL; 514 515 return -EINVAL; 516 } 517 518 component_del(&pdev->dev, &vidi_component_ops); 519 520 return 0; 521 } 522 523 struct platform_driver vidi_driver = { 524 .probe = vidi_probe, 525 .remove = vidi_remove, 526 .driver = { 527 .name = "exynos-drm-vidi", 528 .owner = THIS_MODULE, 529 }, 530 }; 531