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