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