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_vidi.h" 29 30 /* vidi has totally three virtual windows. */ 31 #define WINDOWS_NR 3 32 33 #define ctx_from_connector(c) container_of(c, struct vidi_context, \ 34 connector) 35 36 struct vidi_context { 37 struct drm_encoder encoder; 38 struct platform_device *pdev; 39 struct drm_device *drm_dev; 40 struct exynos_drm_crtc *crtc; 41 struct drm_connector connector; 42 struct exynos_drm_plane planes[WINDOWS_NR]; 43 struct edid *raw_edid; 44 unsigned int clkdiv; 45 unsigned int default_win; 46 unsigned long irq_flags; 47 unsigned int connected; 48 bool vblank_on; 49 bool suspended; 50 bool direct_vblank; 51 struct work_struct work; 52 struct mutex lock; 53 int pipe; 54 }; 55 56 static inline struct vidi_context *encoder_to_vidi(struct drm_encoder *e) 57 { 58 return container_of(e, struct vidi_context, encoder); 59 } 60 61 static const char fake_edid_info[] = { 62 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x4c, 0x2d, 0x05, 0x05, 63 0x00, 0x00, 0x00, 0x00, 0x30, 0x12, 0x01, 0x03, 0x80, 0x10, 0x09, 0x78, 64 0x0a, 0xee, 0x91, 0xa3, 0x54, 0x4c, 0x99, 0x26, 0x0f, 0x50, 0x54, 0xbd, 65 0xee, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 66 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xb0, 0x51, 0x00, 67 0x1b, 0x30, 0x40, 0x70, 0x36, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 68 0x01, 0x1d, 0x00, 0x72, 0x51, 0xd0, 0x1e, 0x20, 0x6e, 0x28, 0x55, 0x00, 69 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18, 70 0x4b, 0x1a, 0x44, 0x17, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 71 0x00, 0x00, 0x00, 0xfc, 0x00, 0x53, 0x41, 0x4d, 0x53, 0x55, 0x4e, 0x47, 72 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0xbc, 0x02, 0x03, 0x1e, 0xf1, 73 0x46, 0x84, 0x05, 0x03, 0x10, 0x20, 0x22, 0x23, 0x09, 0x07, 0x07, 0x83, 74 0x01, 0x00, 0x00, 0xe2, 0x00, 0x0f, 0x67, 0x03, 0x0c, 0x00, 0x10, 0x00, 75 0xb8, 0x2d, 0x01, 0x1d, 0x80, 0x18, 0x71, 0x1c, 0x16, 0x20, 0x58, 0x2c, 76 0x25, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x9e, 0x8c, 0x0a, 0xd0, 0x8a, 77 0x20, 0xe0, 0x2d, 0x10, 0x10, 0x3e, 0x96, 0x00, 0xa0, 0x5a, 0x00, 0x00, 78 0x00, 0x18, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c, 79 0x45, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0x00, 80 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 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, 0x06 84 }; 85 86 static int vidi_enable_vblank(struct exynos_drm_crtc *crtc) 87 { 88 struct vidi_context *ctx = crtc->ctx; 89 90 if (ctx->suspended) 91 return -EPERM; 92 93 if (!test_and_set_bit(0, &ctx->irq_flags)) 94 ctx->vblank_on = true; 95 96 ctx->direct_vblank = true; 97 98 /* 99 * in case of page flip request, vidi_finish_pageflip function 100 * will not be called because direct_vblank is true and then 101 * that function will be called by crtc_ops->update_plane callback 102 */ 103 schedule_work(&ctx->work); 104 105 return 0; 106 } 107 108 static void vidi_disable_vblank(struct exynos_drm_crtc *crtc) 109 { 110 struct vidi_context *ctx = crtc->ctx; 111 112 if (ctx->suspended) 113 return; 114 115 if (test_and_clear_bit(0, &ctx->irq_flags)) 116 ctx->vblank_on = false; 117 } 118 119 static void vidi_update_plane(struct exynos_drm_crtc *crtc, 120 struct exynos_drm_plane *plane) 121 { 122 struct vidi_context *ctx = crtc->ctx; 123 124 if (ctx->suspended) 125 return; 126 127 DRM_DEBUG_KMS("dma_addr = %pad\n", plane->dma_addr); 128 129 if (ctx->vblank_on) 130 schedule_work(&ctx->work); 131 } 132 133 static void vidi_enable(struct exynos_drm_crtc *crtc) 134 { 135 struct vidi_context *ctx = crtc->ctx; 136 137 mutex_lock(&ctx->lock); 138 139 ctx->suspended = false; 140 141 /* if vblank was enabled status, enable it again. */ 142 if (test_and_clear_bit(0, &ctx->irq_flags)) 143 vidi_enable_vblank(ctx->crtc); 144 145 mutex_unlock(&ctx->lock); 146 } 147 148 static void vidi_disable(struct exynos_drm_crtc *crtc) 149 { 150 struct vidi_context *ctx = crtc->ctx; 151 152 mutex_lock(&ctx->lock); 153 154 ctx->suspended = true; 155 156 mutex_unlock(&ctx->lock); 157 } 158 159 static int vidi_ctx_initialize(struct vidi_context *ctx, 160 struct drm_device *drm_dev) 161 { 162 struct exynos_drm_private *priv = drm_dev->dev_private; 163 164 ctx->drm_dev = drm_dev; 165 ctx->pipe = priv->pipe++; 166 167 return 0; 168 } 169 170 static const struct exynos_drm_crtc_ops vidi_crtc_ops = { 171 .enable = vidi_enable, 172 .disable = vidi_disable, 173 .enable_vblank = vidi_enable_vblank, 174 .disable_vblank = vidi_disable_vblank, 175 .update_plane = vidi_update_plane, 176 }; 177 178 static void vidi_fake_vblank_handler(struct work_struct *work) 179 { 180 struct vidi_context *ctx = container_of(work, struct vidi_context, 181 work); 182 183 if (ctx->pipe < 0) 184 return; 185 186 /* refresh rate is about 50Hz. */ 187 usleep_range(16000, 20000); 188 189 mutex_lock(&ctx->lock); 190 191 if (ctx->direct_vblank) { 192 drm_crtc_handle_vblank(&ctx->crtc->base); 193 ctx->direct_vblank = false; 194 mutex_unlock(&ctx->lock); 195 return; 196 } 197 198 mutex_unlock(&ctx->lock); 199 200 exynos_drm_crtc_finish_pageflip(ctx->crtc); 201 } 202 203 static int vidi_show_connection(struct device *dev, 204 struct device_attribute *attr, char *buf) 205 { 206 struct vidi_context *ctx = dev_get_drvdata(dev); 207 int rc; 208 209 mutex_lock(&ctx->lock); 210 211 rc = sprintf(buf, "%d\n", ctx->connected); 212 213 mutex_unlock(&ctx->lock); 214 215 return rc; 216 } 217 218 static int vidi_store_connection(struct device *dev, 219 struct device_attribute *attr, 220 const char *buf, size_t len) 221 { 222 struct vidi_context *ctx = dev_get_drvdata(dev); 223 int ret; 224 225 ret = kstrtoint(buf, 0, &ctx->connected); 226 if (ret) 227 return ret; 228 229 if (ctx->connected > 1) 230 return -EINVAL; 231 232 /* use fake edid data for test. */ 233 if (!ctx->raw_edid) 234 ctx->raw_edid = (struct edid *)fake_edid_info; 235 236 /* if raw_edid isn't same as fake data then it can't be tested. */ 237 if (ctx->raw_edid != (struct edid *)fake_edid_info) { 238 DRM_DEBUG_KMS("edid data is not fake data.\n"); 239 return -EINVAL; 240 } 241 242 DRM_DEBUG_KMS("requested connection.\n"); 243 244 drm_helper_hpd_irq_event(ctx->drm_dev); 245 246 return len; 247 } 248 249 static DEVICE_ATTR(connection, 0644, vidi_show_connection, 250 vidi_store_connection); 251 252 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data, 253 struct drm_file *file_priv) 254 { 255 struct vidi_context *ctx = dev_get_drvdata(drm_dev->dev); 256 struct drm_exynos_vidi_connection *vidi = data; 257 258 if (!vidi) { 259 DRM_DEBUG_KMS("user data for vidi is null.\n"); 260 return -EINVAL; 261 } 262 263 if (vidi->connection > 1) { 264 DRM_DEBUG_KMS("connection should be 0 or 1.\n"); 265 return -EINVAL; 266 } 267 268 if (ctx->connected == vidi->connection) { 269 DRM_DEBUG_KMS("same connection request.\n"); 270 return -EINVAL; 271 } 272 273 if (vidi->connection) { 274 struct edid *raw_edid = (struct edid *)(uint32_t)vidi->edid; 275 if (!drm_edid_is_valid(raw_edid)) { 276 DRM_DEBUG_KMS("edid data is invalid.\n"); 277 return -EINVAL; 278 } 279 ctx->raw_edid = drm_edid_duplicate(raw_edid); 280 if (!ctx->raw_edid) { 281 DRM_DEBUG_KMS("failed to allocate raw_edid.\n"); 282 return -ENOMEM; 283 } 284 } else { 285 /* 286 * with connection = 0, free raw_edid 287 * only if raw edid data isn't same as fake data. 288 */ 289 if (ctx->raw_edid && ctx->raw_edid != 290 (struct edid *)fake_edid_info) { 291 kfree(ctx->raw_edid); 292 ctx->raw_edid = NULL; 293 } 294 } 295 296 ctx->connected = vidi->connection; 297 drm_helper_hpd_irq_event(ctx->drm_dev); 298 299 return 0; 300 } 301 302 static enum drm_connector_status vidi_detect(struct drm_connector *connector, 303 bool force) 304 { 305 struct vidi_context *ctx = ctx_from_connector(connector); 306 307 /* 308 * connection request would come from user side 309 * to do hotplug through specific ioctl. 310 */ 311 return ctx->connected ? connector_status_connected : 312 connector_status_disconnected; 313 } 314 315 static void vidi_connector_destroy(struct drm_connector *connector) 316 { 317 } 318 319 static struct drm_connector_funcs vidi_connector_funcs = { 320 .dpms = drm_atomic_helper_connector_dpms, 321 .fill_modes = drm_helper_probe_single_connector_modes, 322 .detect = vidi_detect, 323 .destroy = vidi_connector_destroy, 324 .reset = drm_atomic_helper_connector_reset, 325 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 326 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 327 }; 328 329 static int vidi_get_modes(struct drm_connector *connector) 330 { 331 struct vidi_context *ctx = ctx_from_connector(connector); 332 struct edid *edid; 333 int edid_len; 334 335 /* 336 * the edid data comes from user side and it would be set 337 * to ctx->raw_edid through specific ioctl. 338 */ 339 if (!ctx->raw_edid) { 340 DRM_DEBUG_KMS("raw_edid is null.\n"); 341 return -EFAULT; 342 } 343 344 edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH; 345 edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL); 346 if (!edid) { 347 DRM_DEBUG_KMS("failed to allocate edid\n"); 348 return -ENOMEM; 349 } 350 351 drm_mode_connector_update_edid_property(connector, edid); 352 353 return drm_add_edid_modes(connector, edid); 354 } 355 356 static struct drm_encoder *vidi_best_encoder(struct drm_connector *connector) 357 { 358 struct vidi_context *ctx = ctx_from_connector(connector); 359 360 return &ctx->encoder; 361 } 362 363 static struct drm_connector_helper_funcs vidi_connector_helper_funcs = { 364 .get_modes = vidi_get_modes, 365 .best_encoder = vidi_best_encoder, 366 }; 367 368 static int vidi_create_connector(struct drm_encoder *encoder) 369 { 370 struct vidi_context *ctx = encoder_to_vidi(encoder); 371 struct drm_connector *connector = &ctx->connector; 372 int ret; 373 374 connector->polled = DRM_CONNECTOR_POLL_HPD; 375 376 ret = drm_connector_init(ctx->drm_dev, connector, 377 &vidi_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL); 378 if (ret) { 379 DRM_ERROR("Failed to initialize connector with drm\n"); 380 return ret; 381 } 382 383 drm_connector_helper_add(connector, &vidi_connector_helper_funcs); 384 drm_connector_register(connector); 385 drm_mode_connector_attach_encoder(connector, encoder); 386 387 return 0; 388 } 389 390 static bool exynos_vidi_mode_fixup(struct drm_encoder *encoder, 391 const struct drm_display_mode *mode, 392 struct drm_display_mode *adjusted_mode) 393 { 394 return true; 395 } 396 397 static void exynos_vidi_mode_set(struct drm_encoder *encoder, 398 struct drm_display_mode *mode, 399 struct drm_display_mode *adjusted_mode) 400 { 401 } 402 403 static void exynos_vidi_enable(struct drm_encoder *encoder) 404 { 405 } 406 407 static void exynos_vidi_disable(struct drm_encoder *encoder) 408 { 409 } 410 411 static struct drm_encoder_helper_funcs exynos_vidi_encoder_helper_funcs = { 412 .mode_fixup = exynos_vidi_mode_fixup, 413 .mode_set = exynos_vidi_mode_set, 414 .enable = exynos_vidi_enable, 415 .disable = exynos_vidi_disable, 416 }; 417 418 static struct drm_encoder_funcs exynos_vidi_encoder_funcs = { 419 .destroy = drm_encoder_cleanup, 420 }; 421 422 static int vidi_bind(struct device *dev, struct device *master, void *data) 423 { 424 struct vidi_context *ctx = dev_get_drvdata(dev); 425 struct drm_device *drm_dev = data; 426 struct drm_encoder *encoder = &ctx->encoder; 427 struct exynos_drm_plane *exynos_plane; 428 enum drm_plane_type type; 429 unsigned int zpos; 430 int pipe, ret; 431 432 vidi_ctx_initialize(ctx, drm_dev); 433 434 for (zpos = 0; zpos < WINDOWS_NR; zpos++) { 435 type = (zpos == ctx->default_win) ? DRM_PLANE_TYPE_PRIMARY : 436 DRM_PLANE_TYPE_OVERLAY; 437 ret = exynos_plane_init(drm_dev, &ctx->planes[zpos], 438 1 << ctx->pipe, type, zpos); 439 if (ret) 440 return ret; 441 } 442 443 exynos_plane = &ctx->planes[ctx->default_win]; 444 ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base, 445 ctx->pipe, EXYNOS_DISPLAY_TYPE_VIDI, 446 &vidi_crtc_ops, ctx); 447 if (IS_ERR(ctx->crtc)) { 448 DRM_ERROR("failed to create crtc.\n"); 449 return PTR_ERR(ctx->crtc); 450 } 451 452 pipe = exynos_drm_crtc_get_pipe_from_type(drm_dev, 453 EXYNOS_DISPLAY_TYPE_VIDI); 454 if (pipe < 0) 455 return pipe; 456 457 encoder->possible_crtcs = 1 << pipe; 458 459 DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs); 460 461 drm_encoder_init(drm_dev, encoder, &exynos_vidi_encoder_funcs, 462 DRM_MODE_ENCODER_TMDS); 463 464 drm_encoder_helper_add(encoder, &exynos_vidi_encoder_helper_funcs); 465 466 ret = vidi_create_connector(encoder); 467 if (ret) { 468 DRM_ERROR("failed to create connector ret = %d\n", ret); 469 drm_encoder_cleanup(encoder); 470 return ret; 471 } 472 473 return 0; 474 } 475 476 477 static void vidi_unbind(struct device *dev, struct device *master, void *data) 478 { 479 } 480 481 static const struct component_ops vidi_component_ops = { 482 .bind = vidi_bind, 483 .unbind = vidi_unbind, 484 }; 485 486 static int vidi_probe(struct platform_device *pdev) 487 { 488 struct vidi_context *ctx; 489 int ret; 490 491 ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL); 492 if (!ctx) 493 return -ENOMEM; 494 495 ctx->default_win = 0; 496 ctx->pdev = pdev; 497 498 INIT_WORK(&ctx->work, vidi_fake_vblank_handler); 499 500 mutex_init(&ctx->lock); 501 502 platform_set_drvdata(pdev, ctx); 503 504 ret = device_create_file(&pdev->dev, &dev_attr_connection); 505 if (ret < 0) { 506 DRM_ERROR("failed to create connection sysfs.\n"); 507 return ret; 508 } 509 510 ret = component_add(&pdev->dev, &vidi_component_ops); 511 if (ret) 512 goto err_remove_file; 513 514 return ret; 515 516 err_remove_file: 517 device_remove_file(&pdev->dev, &dev_attr_connection); 518 519 return ret; 520 } 521 522 static int vidi_remove(struct platform_device *pdev) 523 { 524 struct vidi_context *ctx = platform_get_drvdata(pdev); 525 526 if (ctx->raw_edid != (struct edid *)fake_edid_info) { 527 kfree(ctx->raw_edid); 528 ctx->raw_edid = NULL; 529 530 return -EINVAL; 531 } 532 533 component_del(&pdev->dev, &vidi_component_ops); 534 535 return 0; 536 } 537 538 struct platform_driver vidi_driver = { 539 .probe = vidi_probe, 540 .remove = vidi_remove, 541 .driver = { 542 .name = "exynos-drm-vidi", 543 .owner = THIS_MODULE, 544 }, 545 }; 546