drivers/gpu/drm/exynos/exynos_drm_vidi.c

   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_atomic_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_atomic_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         .atomic_enable = vidi_atomic_enable,
 151         .atomic_disable = vidi_atomic_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 };