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