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_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 };