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