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