1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* exynos_drm_vidi.c 3 * 4 * Copyright (C) 2012 Samsung Electronics Co.Ltd 5 * Authors: 6 * Inki Dae <inki.dae@samsung.com> 7 */ 8 9 #include <linux/component.h> 10 #include <linux/kernel.h> 11 #include <linux/platform_device.h> 12 #include <linux/timer.h> 13 14 #include <drm/drm_atomic_helper.h> 15 #include <drm/drm_edid.h> 16 #include <drm/drm_framebuffer.h> 17 #include <drm/drm_print.h> 18 #include <drm/drm_probe_helper.h> 19 #include <drm/drm_simple_kms_helper.h> 20 #include <drm/drm_vblank.h> 21 #include <drm/exynos_drm.h> 22 23 #include "exynos_drm_crtc.h" 24 #include "exynos_drm_drv.h" 25 #include "exynos_drm_fb.h" 26 #include "exynos_drm_plane.h" 27 #include "exynos_drm_vidi.h" 28 29 /* VIDI uses fixed refresh rate of 50Hz */ 30 #define VIDI_REFRESH_TIME (1000 / 50) 31 32 /* vidi has totally three virtual windows. */ 33 #define WINDOWS_NR 3 34 35 #define ctx_from_connector(c) container_of(c, struct vidi_context, \ 36 connector) 37 38 struct vidi_context { 39 struct drm_encoder encoder; 40 struct drm_device *drm_dev; 41 struct device *dev; 42 struct exynos_drm_crtc *crtc; 43 struct drm_connector connector; 44 struct exynos_drm_plane planes[WINDOWS_NR]; 45 const struct drm_edid *raw_edid; 46 unsigned int clkdiv; 47 unsigned int connected; 48 bool suspended; 49 struct timer_list timer; 50 struct mutex lock; 51 }; 52 53 static inline struct vidi_context *encoder_to_vidi(struct drm_encoder *e) 54 { 55 return container_of(e, struct vidi_context, encoder); 56 } 57 58 static const char fake_edid_info[] = { 59 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x4c, 0x2d, 0x05, 0x05, 60 0x00, 0x00, 0x00, 0x00, 0x30, 0x12, 0x01, 0x03, 0x80, 0x10, 0x09, 0x78, 61 0x0a, 0xee, 0x91, 0xa3, 0x54, 0x4c, 0x99, 0x26, 0x0f, 0x50, 0x54, 0xbd, 62 0xee, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 63 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xb0, 0x51, 0x00, 64 0x1b, 0x30, 0x40, 0x70, 0x36, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 65 0x01, 0x1d, 0x00, 0x72, 0x51, 0xd0, 0x1e, 0x20, 0x6e, 0x28, 0x55, 0x00, 66 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18, 67 0x4b, 0x1a, 0x44, 0x17, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 68 0x00, 0x00, 0x00, 0xfc, 0x00, 0x53, 0x41, 0x4d, 0x53, 0x55, 0x4e, 0x47, 69 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0xbc, 0x02, 0x03, 0x1e, 0xf1, 70 0x46, 0x84, 0x05, 0x03, 0x10, 0x20, 0x22, 0x23, 0x09, 0x07, 0x07, 0x83, 71 0x01, 0x00, 0x00, 0xe2, 0x00, 0x0f, 0x67, 0x03, 0x0c, 0x00, 0x10, 0x00, 72 0xb8, 0x2d, 0x01, 0x1d, 0x80, 0x18, 0x71, 0x1c, 0x16, 0x20, 0x58, 0x2c, 73 0x25, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x9e, 0x8c, 0x0a, 0xd0, 0x8a, 74 0x20, 0xe0, 0x2d, 0x10, 0x10, 0x3e, 0x96, 0x00, 0xa0, 0x5a, 0x00, 0x00, 75 0x00, 0x18, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c, 76 0x45, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0x00, 77 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 78 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 79 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 80 0x00, 0x00, 0x00, 0x06 81 }; 82 83 static const uint32_t formats[] = { 84 DRM_FORMAT_XRGB8888, 85 DRM_FORMAT_ARGB8888, 86 DRM_FORMAT_NV12, 87 }; 88 89 static const enum drm_plane_type vidi_win_types[WINDOWS_NR] = { 90 DRM_PLANE_TYPE_PRIMARY, 91 DRM_PLANE_TYPE_OVERLAY, 92 DRM_PLANE_TYPE_CURSOR, 93 }; 94 95 static int vidi_enable_vblank(struct exynos_drm_crtc *crtc) 96 { 97 struct vidi_context *ctx = crtc->ctx; 98 99 if (ctx->suspended) 100 return -EPERM; 101 102 mod_timer(&ctx->timer, 103 jiffies + msecs_to_jiffies(VIDI_REFRESH_TIME) - 1); 104 105 return 0; 106 } 107 108 static void vidi_disable_vblank(struct exynos_drm_crtc *crtc) 109 { 110 } 111 112 static void vidi_update_plane(struct exynos_drm_crtc *crtc, 113 struct exynos_drm_plane *plane) 114 { 115 struct drm_plane_state *state = plane->base.state; 116 struct vidi_context *ctx = crtc->ctx; 117 dma_addr_t addr; 118 119 if (ctx->suspended) 120 return; 121 122 addr = exynos_drm_fb_dma_addr(state->fb, 0); 123 DRM_DEV_DEBUG_KMS(ctx->dev, "dma_addr = %pad\n", &addr); 124 } 125 126 static void vidi_atomic_enable(struct exynos_drm_crtc *crtc) 127 { 128 struct vidi_context *ctx = crtc->ctx; 129 130 mutex_lock(&ctx->lock); 131 132 ctx->suspended = false; 133 134 mutex_unlock(&ctx->lock); 135 136 drm_crtc_vblank_on(&crtc->base); 137 } 138 139 static void vidi_atomic_disable(struct exynos_drm_crtc *crtc) 140 { 141 struct vidi_context *ctx = crtc->ctx; 142 143 drm_crtc_vblank_off(&crtc->base); 144 145 mutex_lock(&ctx->lock); 146 147 ctx->suspended = true; 148 149 mutex_unlock(&ctx->lock); 150 } 151 152 static const struct exynos_drm_crtc_ops vidi_crtc_ops = { 153 .atomic_enable = vidi_atomic_enable, 154 .atomic_disable = vidi_atomic_disable, 155 .enable_vblank = vidi_enable_vblank, 156 .disable_vblank = vidi_disable_vblank, 157 .update_plane = vidi_update_plane, 158 .atomic_flush = exynos_crtc_handle_event, 159 }; 160 161 static void vidi_fake_vblank_timer(struct timer_list *t) 162 { 163 struct vidi_context *ctx = timer_container_of(ctx, t, timer); 164 165 if (drm_crtc_handle_vblank(&ctx->crtc->base)) 166 mod_timer(&ctx->timer, 167 jiffies + msecs_to_jiffies(VIDI_REFRESH_TIME) - 1); 168 } 169 170 static ssize_t vidi_show_connection(struct device *dev, 171 struct device_attribute *attr, char *buf) 172 { 173 struct vidi_context *ctx = dev_get_drvdata(dev); 174 int rc; 175 176 mutex_lock(&ctx->lock); 177 178 rc = sprintf(buf, "%d\n", ctx->connected); 179 180 mutex_unlock(&ctx->lock); 181 182 return rc; 183 } 184 185 static ssize_t vidi_store_connection(struct device *dev, 186 struct device_attribute *attr, 187 const char *buf, size_t len) 188 { 189 struct vidi_context *ctx = dev_get_drvdata(dev); 190 int ret, new_connected; 191 192 ret = kstrtoint(buf, 0, &new_connected); 193 if (ret) 194 return ret; 195 if (new_connected > 1) 196 return -EINVAL; 197 198 mutex_lock(&ctx->lock); 199 200 /* 201 * Use fake edid data for test. If raw_edid is set then it can't be 202 * tested. 203 */ 204 if (ctx->raw_edid) { 205 DRM_DEV_DEBUG_KMS(dev, "edid data is not fake data.\n"); 206 ret = -EINVAL; 207 goto fail; 208 } 209 210 ctx->connected = new_connected; 211 mutex_unlock(&ctx->lock); 212 213 DRM_DEV_DEBUG_KMS(dev, "requested connection.\n"); 214 215 drm_helper_hpd_irq_event(ctx->drm_dev); 216 217 return len; 218 fail: 219 mutex_unlock(&ctx->lock); 220 return ret; 221 } 222 223 static DEVICE_ATTR(connection, 0644, vidi_show_connection, 224 vidi_store_connection); 225 226 static struct attribute *vidi_attrs[] = { 227 &dev_attr_connection.attr, 228 NULL, 229 }; 230 ATTRIBUTE_GROUPS(vidi); 231 232 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data, 233 struct drm_file *file_priv) 234 { 235 struct exynos_drm_private *priv = drm_dev->dev_private; 236 struct device *dev = priv ? priv->vidi_dev : NULL; 237 struct vidi_context *ctx = dev ? dev_get_drvdata(dev) : NULL; 238 struct drm_exynos_vidi_connection *vidi = data; 239 240 if (!ctx) 241 return -ENODEV; 242 243 if (!vidi) { 244 DRM_DEV_DEBUG_KMS(ctx->dev, 245 "user data for vidi is null.\n"); 246 return -EINVAL; 247 } 248 249 if (vidi->connection > 1) { 250 DRM_DEV_DEBUG_KMS(ctx->dev, 251 "connection should be 0 or 1.\n"); 252 return -EINVAL; 253 } 254 255 mutex_lock(&ctx->lock); 256 if (ctx->connected == vidi->connection) { 257 mutex_unlock(&ctx->lock); 258 DRM_DEV_DEBUG_KMS(ctx->dev, 259 "same connection request.\n"); 260 return -EINVAL; 261 } 262 mutex_unlock(&ctx->lock); 263 264 if (vidi->connection) { 265 const struct drm_edid *drm_edid; 266 const void __user *edid_userptr = u64_to_user_ptr(vidi->edid); 267 void *edid_buf; 268 struct edid hdr; 269 size_t size; 270 271 if (copy_from_user(&hdr, edid_userptr, sizeof(hdr))) 272 return -EFAULT; 273 274 size = (hdr.extensions + 1) * EDID_LENGTH; 275 276 edid_buf = kmalloc(size, GFP_KERNEL); 277 if (!edid_buf) 278 return -ENOMEM; 279 280 if (copy_from_user(edid_buf, edid_userptr, size)) { 281 kfree(edid_buf); 282 return -EFAULT; 283 } 284 285 drm_edid = drm_edid_alloc(edid_buf, size); 286 kfree(edid_buf); 287 if (!drm_edid) 288 return -ENOMEM; 289 290 if (!drm_edid_valid(drm_edid)) { 291 drm_edid_free(drm_edid); 292 DRM_DEV_DEBUG_KMS(ctx->dev, 293 "edid data is invalid.\n"); 294 return -EINVAL; 295 } 296 mutex_lock(&ctx->lock); 297 ctx->raw_edid = drm_edid; 298 mutex_unlock(&ctx->lock); 299 } else { 300 /* with connection = 0, free raw_edid */ 301 mutex_lock(&ctx->lock); 302 drm_edid_free(ctx->raw_edid); 303 ctx->raw_edid = NULL; 304 mutex_unlock(&ctx->lock); 305 } 306 307 mutex_lock(&ctx->lock); 308 ctx->connected = vidi->connection; 309 mutex_unlock(&ctx->lock); 310 311 drm_helper_hpd_irq_event(ctx->drm_dev); 312 313 return 0; 314 } 315 316 static enum drm_connector_status vidi_detect(struct drm_connector *connector, 317 bool force) 318 { 319 struct vidi_context *ctx = ctx_from_connector(connector); 320 321 /* 322 * connection request would come from user side 323 * to do hotplug through specific ioctl. 324 */ 325 return READ_ONCE(ctx->connected) ? connector_status_connected : 326 connector_status_disconnected; 327 } 328 329 static void vidi_connector_destroy(struct drm_connector *connector) 330 { 331 } 332 333 static const struct drm_connector_funcs vidi_connector_funcs = { 334 .fill_modes = drm_helper_probe_single_connector_modes, 335 .detect = vidi_detect, 336 .destroy = vidi_connector_destroy, 337 .reset = drm_atomic_helper_connector_reset, 338 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 339 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 340 }; 341 342 static int vidi_get_modes(struct drm_connector *connector) 343 { 344 struct vidi_context *ctx = ctx_from_connector(connector); 345 const struct drm_edid *drm_edid; 346 int count; 347 348 mutex_lock(&ctx->lock); 349 350 if (ctx->raw_edid) 351 drm_edid = drm_edid_dup(ctx->raw_edid); 352 else 353 drm_edid = drm_edid_alloc(fake_edid_info, sizeof(fake_edid_info)); 354 355 mutex_unlock(&ctx->lock); 356 357 drm_edid_connector_update(connector, drm_edid); 358 359 count = drm_edid_connector_add_modes(connector); 360 361 drm_edid_free(drm_edid); 362 363 return count; 364 } 365 366 static const struct drm_connector_helper_funcs vidi_connector_helper_funcs = { 367 .get_modes = vidi_get_modes, 368 }; 369 370 static int vidi_create_connector(struct drm_encoder *encoder) 371 { 372 struct vidi_context *ctx = encoder_to_vidi(encoder); 373 struct drm_connector *connector = &ctx->connector; 374 int ret; 375 376 connector->polled = DRM_CONNECTOR_POLL_HPD; 377 378 ret = drm_connector_init(ctx->drm_dev, connector, 379 &vidi_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL); 380 if (ret) { 381 DRM_DEV_ERROR(ctx->dev, 382 "Failed to initialize connector with drm\n"); 383 return ret; 384 } 385 386 drm_connector_helper_add(connector, &vidi_connector_helper_funcs); 387 drm_connector_attach_encoder(connector, encoder); 388 389 return 0; 390 } 391 392 static void exynos_vidi_mode_set(struct drm_encoder *encoder, 393 struct drm_display_mode *mode, 394 struct drm_display_mode *adjusted_mode) 395 { 396 } 397 398 static void exynos_vidi_enable(struct drm_encoder *encoder) 399 { 400 } 401 402 static void exynos_vidi_disable(struct drm_encoder *encoder) 403 { 404 } 405 406 static const struct drm_encoder_helper_funcs exynos_vidi_encoder_helper_funcs = { 407 .mode_set = exynos_vidi_mode_set, 408 .enable = exynos_vidi_enable, 409 .disable = exynos_vidi_disable, 410 }; 411 412 static int vidi_bind(struct device *dev, struct device *master, void *data) 413 { 414 struct vidi_context *ctx = dev_get_drvdata(dev); 415 struct drm_device *drm_dev = data; 416 struct exynos_drm_private *priv = drm_dev->dev_private; 417 struct drm_encoder *encoder = &ctx->encoder; 418 struct exynos_drm_plane *exynos_plane; 419 struct exynos_drm_plane_config plane_config = { 0 }; 420 unsigned int i; 421 int ret; 422 423 ctx->drm_dev = drm_dev; 424 if (priv) 425 priv->vidi_dev = dev; 426 427 plane_config.pixel_formats = formats; 428 plane_config.num_pixel_formats = ARRAY_SIZE(formats); 429 430 for (i = 0; i < WINDOWS_NR; i++) { 431 plane_config.zpos = i; 432 plane_config.type = vidi_win_types[i]; 433 434 ret = exynos_plane_init(drm_dev, &ctx->planes[i], i, 435 &plane_config); 436 if (ret) 437 return ret; 438 } 439 440 exynos_plane = &ctx->planes[DEFAULT_WIN]; 441 ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base, 442 EXYNOS_DISPLAY_TYPE_VIDI, &vidi_crtc_ops, ctx); 443 if (IS_ERR(ctx->crtc)) { 444 DRM_DEV_ERROR(dev, "failed to create crtc.\n"); 445 return PTR_ERR(ctx->crtc); 446 } 447 448 drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS); 449 450 drm_encoder_helper_add(encoder, &exynos_vidi_encoder_helper_funcs); 451 452 ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_VIDI); 453 if (ret < 0) 454 return ret; 455 456 ret = vidi_create_connector(encoder); 457 if (ret) { 458 DRM_DEV_ERROR(dev, "failed to create connector ret = %d\n", 459 ret); 460 drm_encoder_cleanup(encoder); 461 return ret; 462 } 463 464 return 0; 465 } 466 467 468 static void vidi_unbind(struct device *dev, struct device *master, void *data) 469 { 470 struct vidi_context *ctx = dev_get_drvdata(dev); 471 struct drm_device *drm_dev = data; 472 struct exynos_drm_private *priv = drm_dev->dev_private; 473 474 timer_delete_sync(&ctx->timer); 475 if (priv) 476 priv->vidi_dev = NULL; 477 } 478 479 static const struct component_ops vidi_component_ops = { 480 .bind = vidi_bind, 481 .unbind = vidi_unbind, 482 }; 483 484 static int vidi_probe(struct platform_device *pdev) 485 { 486 struct vidi_context *ctx; 487 struct device *dev = &pdev->dev; 488 489 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); 490 if (!ctx) 491 return -ENOMEM; 492 493 ctx->dev = dev; 494 495 timer_setup(&ctx->timer, vidi_fake_vblank_timer, 0); 496 497 mutex_init(&ctx->lock); 498 499 platform_set_drvdata(pdev, ctx); 500 501 return component_add(dev, &vidi_component_ops); 502 } 503 504 static void vidi_remove(struct platform_device *pdev) 505 { 506 struct vidi_context *ctx = platform_get_drvdata(pdev); 507 508 mutex_lock(&ctx->lock); 509 510 drm_edid_free(ctx->raw_edid); 511 ctx->raw_edid = NULL; 512 513 mutex_unlock(&ctx->lock); 514 515 component_del(&pdev->dev, &vidi_component_ops); 516 } 517 518 struct platform_driver vidi_driver = { 519 .probe = vidi_probe, 520 .remove = vidi_remove, 521 .driver = { 522 .name = "exynos-drm-vidi", 523 .dev_groups = vidi_groups, 524 }, 525 }; 526