drivers/gpu/drm/exynos/exynos_drm_vidi.c

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