drivers/gpu/drm/mediatek/mtk_drm_drv.c

   1 /*
   2  * Copyright (c) 2015 MediaTek Inc.
   3  * Author: YT SHEN <yt.shen@mediatek.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <drm/drmP.h>
  16 #include <drm/drm_atomic.h>
  17 #include <drm/drm_atomic_helper.h>
  18 #include <drm/drm_crtc_helper.h>
  19 #include <drm/drm_gem.h>
  20 #include <drm/drm_gem_cma_helper.h>
  21 #include <drm/drm_of.h>
  22 #include <linux/component.h>
  23 #include <linux/iommu.h>
  24 #include <linux/of_address.h>
  25 #include <linux/of_platform.h>
  26 #include <linux/pm_runtime.h>
  27
  28 #include "mtk_drm_crtc.h"
  29 #include "mtk_drm_ddp.h"
  30 #include "mtk_drm_ddp_comp.h"
  31 #include "mtk_drm_drv.h"
  32 #include "mtk_drm_fb.h"
  33 #include "mtk_drm_gem.h"
  34
  35 #define DRIVER_NAME "mediatek"
  36 #define DRIVER_DESC "Mediatek SoC DRM"
  37 #define DRIVER_DATE "20150513"
  38 #define DRIVER_MAJOR 1
  39 #define DRIVER_MINOR 0
  40
  41 static void mtk_atomic_schedule(struct mtk_drm_private *private,
  42                                 struct drm_atomic_state *state)
  43 {
  44         private->commit.state = state;
  45         schedule_work(&private->commit.work);
  46 }
  47
  48 static void mtk_atomic_wait_for_fences(struct drm_atomic_state *state)
  49 {
  50         struct drm_plane *plane;
  51         struct drm_plane_state *plane_state;
  52         int i;
  53
  54         for_each_plane_in_state(state, plane, plane_state, i)
  55                 mtk_fb_wait(plane->state->fb);
  56 }
  57
  58 static void mtk_atomic_complete(struct mtk_drm_private *private,
  59                                 struct drm_atomic_state *state)
  60 {
  61         struct drm_device *drm = private->drm;
  62
  63         mtk_atomic_wait_for_fences(state);
  64
  65         /*
  66          * Mediatek drm supports runtime PM, so plane registers cannot be
  67          * written when their crtc is disabled.
  68          *
  69          * The comment for drm_atomic_helper_commit states:
  70          *     For drivers supporting runtime PM the recommended sequence is
  71          *
  72          *     drm_atomic_helper_commit_modeset_disables(dev, state);
  73          *     drm_atomic_helper_commit_modeset_enables(dev, state);
  74          *     drm_atomic_helper_commit_planes(dev, state,
  75          *                                     DRM_PLANE_COMMIT_ACTIVE_ONLY);
  76          *
  77          * See the kerneldoc entries for these three functions for more details.
  78          */
  79         drm_atomic_helper_commit_modeset_disables(drm, state);
  80         drm_atomic_helper_commit_modeset_enables(drm, state);
  81         drm_atomic_helper_commit_planes(drm, state,
  82                                         DRM_PLANE_COMMIT_ACTIVE_ONLY);
  83
  84         drm_atomic_helper_wait_for_vblanks(drm, state);
  85
  86         drm_atomic_helper_cleanup_planes(drm, state);
  87         drm_atomic_state_put(state);
  88 }
  89
  90 static void mtk_atomic_work(struct work_struct *work)
  91 {
  92         struct mtk_drm_private *private = container_of(work,
  93                         struct mtk_drm_private, commit.work);
  94
  95         mtk_atomic_complete(private, private->commit.state);
  96 }
  97
  98 static int mtk_atomic_commit(struct drm_device *drm,
  99                              struct drm_atomic_state *state,
 100                              bool async)
 101 {
 102         struct mtk_drm_private *private = drm->dev_private;
 103         int ret;
 104
 105         ret = drm_atomic_helper_prepare_planes(drm, state);
 106         if (ret)
 107                 return ret;
 108
 109         mutex_lock(&private->commit.lock);
 110         flush_work(&private->commit.work);
 111
 112         drm_atomic_helper_swap_state(state, true);
 113
 114         drm_atomic_state_get(state);
 115         if (async)
 116                 mtk_atomic_schedule(private, state);
 117         else
 118                 mtk_atomic_complete(private, state);
 119
 120         mutex_unlock(&private->commit.lock);
 121
 122         return 0;
 123 }
 124
 125 static const struct drm_mode_config_funcs mtk_drm_mode_config_funcs = {
 126         .fb_create = mtk_drm_mode_fb_create,
 127         .atomic_check = drm_atomic_helper_check,
 128         .atomic_commit = mtk_atomic_commit,
 129 };
 130
 131 static const enum mtk_ddp_comp_id mt2701_mtk_ddp_main[] = {
 132         DDP_COMPONENT_OVL0,
 133         DDP_COMPONENT_RDMA0,
 134         DDP_COMPONENT_COLOR0,
 135         DDP_COMPONENT_BLS,
 136         DDP_COMPONENT_DSI0,
 137 };
 138
 139 static const enum mtk_ddp_comp_id mt2701_mtk_ddp_ext[] = {
 140         DDP_COMPONENT_RDMA1,
 141         DDP_COMPONENT_DPI0,
 142 };
 143
 144 static const enum mtk_ddp_comp_id mt8173_mtk_ddp_main[] = {
 145         DDP_COMPONENT_OVL0,
 146         DDP_COMPONENT_COLOR0,
 147         DDP_COMPONENT_AAL,
 148         DDP_COMPONENT_OD,
 149         DDP_COMPONENT_RDMA0,
 150         DDP_COMPONENT_UFOE,
 151         DDP_COMPONENT_DSI0,
 152         DDP_COMPONENT_PWM0,
 153 };
 154
 155 static const enum mtk_ddp_comp_id mt8173_mtk_ddp_ext[] = {
 156         DDP_COMPONENT_OVL1,
 157         DDP_COMPONENT_COLOR1,
 158         DDP_COMPONENT_GAMMA,
 159         DDP_COMPONENT_RDMA1,
 160         DDP_COMPONENT_DPI0,
 161 };
 162
 163 static const struct mtk_mmsys_driver_data mt2701_mmsys_driver_data = {
 164         .main_path = mt2701_mtk_ddp_main,
 165         .main_len = ARRAY_SIZE(mt2701_mtk_ddp_main),
 166         .ext_path = mt2701_mtk_ddp_ext,
 167         .ext_len = ARRAY_SIZE(mt2701_mtk_ddp_ext),
 168         .shadow_register = true,
 169 };
 170
 171 static const struct mtk_mmsys_driver_data mt8173_mmsys_driver_data = {
 172         .main_path = mt8173_mtk_ddp_main,
 173         .main_len = ARRAY_SIZE(mt8173_mtk_ddp_main),
 174         .ext_path = mt8173_mtk_ddp_ext,
 175         .ext_len = ARRAY_SIZE(mt8173_mtk_ddp_ext),
 176 };
 177
 178 static int mtk_drm_kms_init(struct drm_device *drm)
 179 {
 180         struct mtk_drm_private *private = drm->dev_private;
 181         struct platform_device *pdev;
 182         struct device_node *np;
 183         int ret;
 184
 185         if (!iommu_present(&platform_bus_type))
 186                 return -EPROBE_DEFER;
 187
 188         pdev = of_find_device_by_node(private->mutex_node);
 189         if (!pdev) {
 190                 dev_err(drm->dev, "Waiting for disp-mutex device %s\n",
 191                         private->mutex_node->full_name);
 192                 of_node_put(private->mutex_node);
 193                 return -EPROBE_DEFER;
 194         }
 195         private->mutex_dev = &pdev->dev;
 196
 197         drm_mode_config_init(drm);
 198
 199         drm->mode_config.min_width = 64;
 200         drm->mode_config.min_height = 64;
 201
 202         /*
 203          * set max width and height as default value(4096x4096).
 204          * this value would be used to check framebuffer size limitation
 205          * at drm_mode_addfb().
 206          */
 207         drm->mode_config.max_width = 4096;
 208         drm->mode_config.max_height = 4096;
 209         drm->mode_config.funcs = &mtk_drm_mode_config_funcs;
 210
 211         ret = component_bind_all(drm->dev, drm);
 212         if (ret)
 213                 goto err_config_cleanup;
 214
 215         /*
 216          * We currently support two fixed data streams, each optional,
 217          * and each statically assigned to a crtc:
 218          * OVL0 -> COLOR0 -> AAL -> OD -> RDMA0 -> UFOE -> DSI0 ...
 219          */
 220         ret = mtk_drm_crtc_create(drm, private->data->main_path,
 221                                   private->data->main_len);
 222         if (ret < 0)
 223                 goto err_component_unbind;
 224         /* ... and OVL1 -> COLOR1 -> GAMMA -> RDMA1 -> DPI0. */
 225         ret = mtk_drm_crtc_create(drm, private->data->ext_path,
 226                                   private->data->ext_len);
 227         if (ret < 0)
 228                 goto err_component_unbind;
 229
 230         /* Use OVL device for all DMA memory allocations */
 231         np = private->comp_node[private->data->main_path[0]] ?:
 232              private->comp_node[private->data->ext_path[0]];
 233         pdev = of_find_device_by_node(np);
 234         if (!pdev) {
 235                 ret = -ENODEV;
 236                 dev_err(drm->dev, "Need at least one OVL device\n");
 237                 goto err_component_unbind;
 238         }
 239
 240         private->dma_dev = &pdev->dev;
 241
 242         /*
 243          * We don't use the drm_irq_install() helpers provided by the DRM
 244          * core, so we need to set this manually in order to allow the
 245          * DRM_IOCTL_WAIT_VBLANK to operate correctly.
 246          */
 247         drm->irq_enabled = true;
 248         ret = drm_vblank_init(drm, MAX_CRTC);
 249         if (ret < 0)
 250                 goto err_component_unbind;
 251
 252         drm_kms_helper_poll_init(drm);
 253         drm_mode_config_reset(drm);
 254
 255         return 0;
 256
 257 err_component_unbind:
 258         component_unbind_all(drm->dev, drm);
 259 err_config_cleanup:
 260         drm_mode_config_cleanup(drm);
 261
 262         return ret;
 263 }
 264
 265 static void mtk_drm_kms_deinit(struct drm_device *drm)
 266 {
 267         drm_kms_helper_poll_fini(drm);
 268
 269         drm_vblank_cleanup(drm);
 270         component_unbind_all(drm->dev, drm);
 271         drm_mode_config_cleanup(drm);
 272 }
 273
 274 static const struct file_operations mtk_drm_fops = {
 275         .owner = THIS_MODULE,
 276         .open = drm_open,
 277         .release = drm_release,
 278         .unlocked_ioctl = drm_ioctl,
 279         .mmap = mtk_drm_gem_mmap,
 280         .poll = drm_poll,
 281         .read = drm_read,
 282         .compat_ioctl = drm_compat_ioctl,
 283 };
 284
 285 static struct drm_driver mtk_drm_driver = {
 286         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
 287                            DRIVER_ATOMIC,
 288
 289         .gem_free_object_unlocked = mtk_drm_gem_free_object,
 290         .gem_vm_ops = &drm_gem_cma_vm_ops,
 291         .dumb_create = mtk_drm_gem_dumb_create,
 292         .dumb_map_offset = mtk_drm_gem_dumb_map_offset,
 293         .dumb_destroy = drm_gem_dumb_destroy,
 294
 295         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 296         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 297         .gem_prime_export = drm_gem_prime_export,
 298         .gem_prime_import = drm_gem_prime_import,
 299         .gem_prime_get_sg_table = mtk_gem_prime_get_sg_table,
 300         .gem_prime_import_sg_table = mtk_gem_prime_import_sg_table,
 301         .gem_prime_mmap = mtk_drm_gem_mmap_buf,
 302         .fops = &mtk_drm_fops,
 303
 304         .name = DRIVER_NAME,
 305         .desc = DRIVER_DESC,
 306         .date = DRIVER_DATE,
 307         .major = DRIVER_MAJOR,
 308         .minor = DRIVER_MINOR,
 309 };
 310
 311 static int compare_of(struct device *dev, void *data)
 312 {
 313         return dev->of_node == data;
 314 }
 315
 316 static int mtk_drm_bind(struct device *dev)
 317 {
 318         struct mtk_drm_private *private = dev_get_drvdata(dev);
 319         struct drm_device *drm;
 320         int ret;
 321
 322         drm = drm_dev_alloc(&mtk_drm_driver, dev);
 323         if (IS_ERR(drm))
 324                 return PTR_ERR(drm);
 325
 326         drm->dev_private = private;
 327         private->drm = drm;
 328
 329         ret = mtk_drm_kms_init(drm);
 330         if (ret < 0)
 331                 goto err_free;
 332
 333         ret = drm_dev_register(drm, 0);
 334         if (ret < 0)
 335                 goto err_deinit;
 336
 337         return 0;
 338
 339 err_deinit:
 340         mtk_drm_kms_deinit(drm);
 341 err_free:
 342         drm_dev_unref(drm);
 343         return ret;
 344 }
 345
 346 static void mtk_drm_unbind(struct device *dev)
 347 {
 348         struct mtk_drm_private *private = dev_get_drvdata(dev);
 349
 350         drm_dev_unregister(private->drm);
 351         drm_dev_unref(private->drm);
 352         private->drm = NULL;
 353 }
 354
 355 static const struct component_master_ops mtk_drm_ops = {
 356         .bind           = mtk_drm_bind,
 357         .unbind         = mtk_drm_unbind,
 358 };
 359
 360 static const struct of_device_id mtk_ddp_comp_dt_ids[] = {
 361         { .compatible = "mediatek,mt2701-disp-ovl",   .data = (void *)MTK_DISP_OVL },
 362         { .compatible = "mediatek,mt8173-disp-ovl",   .data = (void *)MTK_DISP_OVL },
 363         { .compatible = "mediatek,mt2701-disp-rdma",  .data = (void *)MTK_DISP_RDMA },
 364         { .compatible = "mediatek,mt8173-disp-rdma",  .data = (void *)MTK_DISP_RDMA },
 365         { .compatible = "mediatek,mt8173-disp-wdma",  .data = (void *)MTK_DISP_WDMA },
 366         { .compatible = "mediatek,mt2701-disp-color", .data = (void *)MTK_DISP_COLOR },
 367         { .compatible = "mediatek,mt8173-disp-color", .data = (void *)MTK_DISP_COLOR },
 368         { .compatible = "mediatek,mt8173-disp-aal",   .data = (void *)MTK_DISP_AAL},
 369         { .compatible = "mediatek,mt8173-disp-gamma", .data = (void *)MTK_DISP_GAMMA, },
 370         { .compatible = "mediatek,mt8173-disp-ufoe",  .data = (void *)MTK_DISP_UFOE },
 371         { .compatible = "mediatek,mt2701-dsi",        .data = (void *)MTK_DSI },
 372         { .compatible = "mediatek,mt8173-dsi",        .data = (void *)MTK_DSI },
 373         { .compatible = "mediatek,mt8173-dpi",        .data = (void *)MTK_DPI },
 374         { .compatible = "mediatek,mt2701-disp-mutex", .data = (void *)MTK_DISP_MUTEX },
 375         { .compatible = "mediatek,mt8173-disp-mutex", .data = (void *)MTK_DISP_MUTEX },
 376         { .compatible = "mediatek,mt2701-disp-pwm",   .data = (void *)MTK_DISP_BLS },
 377         { .compatible = "mediatek,mt8173-disp-pwm",   .data = (void *)MTK_DISP_PWM },
 378         { .compatible = "mediatek,mt8173-disp-od",    .data = (void *)MTK_DISP_OD },
 379         { }
 380 };
 381
 382 static int mtk_drm_probe(struct platform_device *pdev)
 383 {
 384         struct device *dev = &pdev->dev;
 385         struct mtk_drm_private *private;
 386         struct resource *mem;
 387         struct device_node *node;
 388         struct component_match *match = NULL;
 389         int ret;
 390         int i;
 391
 392         private = devm_kzalloc(dev, sizeof(*private), GFP_KERNEL);
 393         if (!private)
 394                 return -ENOMEM;
 395
 396         mutex_init(&private->commit.lock);
 397         INIT_WORK(&private->commit.work, mtk_atomic_work);
 398         private->data = of_device_get_match_data(dev);
 399
 400         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 401         private->config_regs = devm_ioremap_resource(dev, mem);
 402         if (IS_ERR(private->config_regs)) {
 403                 ret = PTR_ERR(private->config_regs);
 404                 dev_err(dev, "Failed to ioremap mmsys-config resource: %d\n",
 405                         ret);
 406                 return ret;
 407         }
 408
 409         /* Iterate over sibling DISP function blocks */
 410         for_each_child_of_node(dev->of_node->parent, node) {
 411                 const struct of_device_id *of_id;
 412                 enum mtk_ddp_comp_type comp_type;
 413                 int comp_id;
 414
 415                 of_id = of_match_node(mtk_ddp_comp_dt_ids, node);
 416                 if (!of_id)
 417                         continue;
 418
 419                 if (!of_device_is_available(node)) {
 420                         dev_dbg(dev, "Skipping disabled component %s\n",
 421                                 node->full_name);
 422                         continue;
 423                 }
 424
 425                 comp_type = (enum mtk_ddp_comp_type)of_id->data;
 426
 427                 if (comp_type == MTK_DISP_MUTEX) {
 428                         private->mutex_node = of_node_get(node);
 429                         continue;
 430                 }
 431
 432                 comp_id = mtk_ddp_comp_get_id(node, comp_type);
 433                 if (comp_id < 0) {
 434                         dev_warn(dev, "Skipping unknown component %s\n",
 435                                  node->full_name);
 436                         continue;
 437                 }
 438
 439                 private->comp_node[comp_id] = of_node_get(node);
 440
 441                 /*
 442                  * Currently only the COLOR, OVL, RDMA, DSI, and DPI blocks have
 443                  * separate component platform drivers and initialize their own
 444                  * DDP component structure. The others are initialized here.
 445                  */
 446                 if (comp_type == MTK_DISP_COLOR ||
 447                     comp_type == MTK_DISP_OVL ||
 448                     comp_type == MTK_DISP_RDMA ||
 449                     comp_type == MTK_DSI ||
 450                     comp_type == MTK_DPI) {
 451                         dev_info(dev, "Adding component match for %s\n",
 452                                  node->full_name);
 453                         drm_of_component_match_add(dev, &match, compare_of,
 454                                                    node);
 455                 } else {
 456                         struct mtk_ddp_comp *comp;
 457
 458                         comp = devm_kzalloc(dev, sizeof(*comp), GFP_KERNEL);
 459                         if (!comp) {
 460                                 ret = -ENOMEM;
 461                                 goto err_node;
 462                         }
 463
 464                         ret = mtk_ddp_comp_init(dev, node, comp, comp_id, NULL);
 465                         if (ret)
 466                                 goto err_node;
 467
 468                         private->ddp_comp[comp_id] = comp;
 469                 }
 470         }
 471
 472         if (!private->mutex_node) {
 473                 dev_err(dev, "Failed to find disp-mutex node\n");
 474                 ret = -ENODEV;
 475                 goto err_node;
 476         }
 477
 478         pm_runtime_enable(dev);
 479
 480         platform_set_drvdata(pdev, private);
 481
 482         ret = component_master_add_with_match(dev, &mtk_drm_ops, match);
 483         if (ret)
 484                 goto err_pm;
 485
 486         return 0;
 487
 488 err_pm:
 489         pm_runtime_disable(dev);
 490 err_node:
 491         of_node_put(private->mutex_node);
 492         for (i = 0; i < DDP_COMPONENT_ID_MAX; i++)
 493                 of_node_put(private->comp_node[i]);
 494         return ret;
 495 }
 496
 497 static int mtk_drm_remove(struct platform_device *pdev)
 498 {
 499         struct mtk_drm_private *private = platform_get_drvdata(pdev);
 500         struct drm_device *drm = private->drm;
 501         int i;
 502
 503         drm_dev_unregister(drm);
 504         mtk_drm_kms_deinit(drm);
 505         drm_dev_unref(drm);
 506
 507         component_master_del(&pdev->dev, &mtk_drm_ops);
 508         pm_runtime_disable(&pdev->dev);
 509         of_node_put(private->mutex_node);
 510         for (i = 0; i < DDP_COMPONENT_ID_MAX; i++)
 511                 of_node_put(private->comp_node[i]);
 512
 513         return 0;
 514 }
 515
 516 #ifdef CONFIG_PM_SLEEP
 517 static int mtk_drm_sys_suspend(struct device *dev)
 518 {
 519         struct mtk_drm_private *private = dev_get_drvdata(dev);
 520         struct drm_device *drm = private->drm;
 521
 522         drm_kms_helper_poll_disable(drm);
 523
 524         private->suspend_state = drm_atomic_helper_suspend(drm);
 525         if (IS_ERR(private->suspend_state)) {
 526                 drm_kms_helper_poll_enable(drm);
 527                 return PTR_ERR(private->suspend_state);
 528         }
 529
 530         DRM_DEBUG_DRIVER("mtk_drm_sys_suspend\n");
 531         return 0;
 532 }
 533
 534 static int mtk_drm_sys_resume(struct device *dev)
 535 {
 536         struct mtk_drm_private *private = dev_get_drvdata(dev);
 537         struct drm_device *drm = private->drm;
 538
 539         drm_atomic_helper_resume(drm, private->suspend_state);
 540         drm_kms_helper_poll_enable(drm);
 541
 542         DRM_DEBUG_DRIVER("mtk_drm_sys_resume\n");
 543         return 0;
 544 }
 545 #endif
 546
 547 static SIMPLE_DEV_PM_OPS(mtk_drm_pm_ops, mtk_drm_sys_suspend,
 548                          mtk_drm_sys_resume);
 549
 550 static const struct of_device_id mtk_drm_of_ids[] = {
 551         { .compatible = "mediatek,mt2701-mmsys",
 552           .data = &mt2701_mmsys_driver_data},
 553         { .compatible = "mediatek,mt8173-mmsys",
 554           .data = &mt8173_mmsys_driver_data},
 555         { }
 556 };
 557
 558 static struct platform_driver mtk_drm_platform_driver = {
 559         .probe  = mtk_drm_probe,
 560         .remove = mtk_drm_remove,
 561         .driver = {
 562                 .name   = "mediatek-drm",
 563                 .of_match_table = mtk_drm_of_ids,
 564                 .pm     = &mtk_drm_pm_ops,
 565         },
 566 };
 567
 568 static struct platform_driver * const mtk_drm_drivers[] = {
 569         &mtk_ddp_driver,
 570         &mtk_disp_color_driver,
 571         &mtk_disp_ovl_driver,
 572         &mtk_disp_rdma_driver,
 573         &mtk_dpi_driver,
 574         &mtk_drm_platform_driver,
 575         &mtk_dsi_driver,
 576         &mtk_mipi_tx_driver,
 577 };
 578
 579 static int __init mtk_drm_init(void)
 580 {
 581         return platform_register_drivers(mtk_drm_drivers,
 582                                          ARRAY_SIZE(mtk_drm_drivers));
 583 }
 584
 585 static void __exit mtk_drm_exit(void)
 586 {
 587         platform_unregister_drivers(mtk_drm_drivers,
 588                                     ARRAY_SIZE(mtk_drm_drivers));
 589 }
 590
 591 module_init(mtk_drm_init);
 592 module_exit(mtk_drm_exit);
 593
 594 MODULE_AUTHOR("YT SHEN <yt.shen@mediatek.com>");
 595 MODULE_DESCRIPTION("Mediatek SoC DRM driver");
 596 MODULE_LICENSE("GPL v2");