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 mtk_ddp_main[] = { 132 DDP_COMPONENT_OVL0, 133 DDP_COMPONENT_COLOR0, 134 DDP_COMPONENT_AAL, 135 DDP_COMPONENT_OD, 136 DDP_COMPONENT_RDMA0, 137 DDP_COMPONENT_UFOE, 138 DDP_COMPONENT_DSI0, 139 DDP_COMPONENT_PWM0, 140 }; 141 142 static const enum mtk_ddp_comp_id mtk_ddp_ext[] = { 143 DDP_COMPONENT_OVL1, 144 DDP_COMPONENT_COLOR1, 145 DDP_COMPONENT_GAMMA, 146 DDP_COMPONENT_RDMA1, 147 DDP_COMPONENT_DPI0, 148 }; 149 150 static int mtk_drm_kms_init(struct drm_device *drm) 151 { 152 struct mtk_drm_private *private = drm->dev_private; 153 struct platform_device *pdev; 154 struct device_node *np; 155 int ret; 156 157 if (!iommu_present(&platform_bus_type)) 158 return -EPROBE_DEFER; 159 160 pdev = of_find_device_by_node(private->mutex_node); 161 if (!pdev) { 162 dev_err(drm->dev, "Waiting for disp-mutex device %s\n", 163 private->mutex_node->full_name); 164 of_node_put(private->mutex_node); 165 return -EPROBE_DEFER; 166 } 167 private->mutex_dev = &pdev->dev; 168 169 drm_mode_config_init(drm); 170 171 drm->mode_config.min_width = 64; 172 drm->mode_config.min_height = 64; 173 174 /* 175 * set max width and height as default value(4096x4096). 176 * this value would be used to check framebuffer size limitation 177 * at drm_mode_addfb(). 178 */ 179 drm->mode_config.max_width = 4096; 180 drm->mode_config.max_height = 4096; 181 drm->mode_config.funcs = &mtk_drm_mode_config_funcs; 182 183 ret = component_bind_all(drm->dev, drm); 184 if (ret) 185 goto err_config_cleanup; 186 187 /* 188 * We currently support two fixed data streams, each optional, 189 * and each statically assigned to a crtc: 190 * OVL0 -> COLOR0 -> AAL -> OD -> RDMA0 -> UFOE -> DSI0 ... 191 */ 192 ret = mtk_drm_crtc_create(drm, mtk_ddp_main, ARRAY_SIZE(mtk_ddp_main)); 193 if (ret < 0) 194 goto err_component_unbind; 195 /* ... and OVL1 -> COLOR1 -> GAMMA -> RDMA1 -> DPI0. */ 196 ret = mtk_drm_crtc_create(drm, mtk_ddp_ext, ARRAY_SIZE(mtk_ddp_ext)); 197 if (ret < 0) 198 goto err_component_unbind; 199 200 /* Use OVL device for all DMA memory allocations */ 201 np = private->comp_node[mtk_ddp_main[0]] ?: 202 private->comp_node[mtk_ddp_ext[0]]; 203 pdev = of_find_device_by_node(np); 204 if (!pdev) { 205 ret = -ENODEV; 206 dev_err(drm->dev, "Need at least one OVL device\n"); 207 goto err_component_unbind; 208 } 209 210 private->dma_dev = &pdev->dev; 211 212 /* 213 * We don't use the drm_irq_install() helpers provided by the DRM 214 * core, so we need to set this manually in order to allow the 215 * DRM_IOCTL_WAIT_VBLANK to operate correctly. 216 */ 217 drm->irq_enabled = true; 218 ret = drm_vblank_init(drm, MAX_CRTC); 219 if (ret < 0) 220 goto err_component_unbind; 221 222 drm_kms_helper_poll_init(drm); 223 drm_mode_config_reset(drm); 224 225 return 0; 226 227 err_component_unbind: 228 component_unbind_all(drm->dev, drm); 229 err_config_cleanup: 230 drm_mode_config_cleanup(drm); 231 232 return ret; 233 } 234 235 static void mtk_drm_kms_deinit(struct drm_device *drm) 236 { 237 drm_kms_helper_poll_fini(drm); 238 239 drm_vblank_cleanup(drm); 240 component_unbind_all(drm->dev, drm); 241 drm_mode_config_cleanup(drm); 242 } 243 244 static const struct file_operations mtk_drm_fops = { 245 .owner = THIS_MODULE, 246 .open = drm_open, 247 .release = drm_release, 248 .unlocked_ioctl = drm_ioctl, 249 .mmap = mtk_drm_gem_mmap, 250 .poll = drm_poll, 251 .read = drm_read, 252 .compat_ioctl = drm_compat_ioctl, 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_no_hw_counter, 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 drm_of_component_match_add(dev, &match, compare_of, 420 node); 421 } else { 422 struct mtk_ddp_comp *comp; 423 424 comp = devm_kzalloc(dev, sizeof(*comp), GFP_KERNEL); 425 if (!comp) { 426 ret = -ENOMEM; 427 goto err_node; 428 } 429 430 ret = mtk_ddp_comp_init(dev, node, comp, comp_id, NULL); 431 if (ret) 432 goto err_node; 433 434 private->ddp_comp[comp_id] = comp; 435 } 436 } 437 438 if (!private->mutex_node) { 439 dev_err(dev, "Failed to find disp-mutex node\n"); 440 ret = -ENODEV; 441 goto err_node; 442 } 443 444 pm_runtime_enable(dev); 445 446 platform_set_drvdata(pdev, private); 447 448 ret = component_master_add_with_match(dev, &mtk_drm_ops, match); 449 if (ret) 450 goto err_pm; 451 452 return 0; 453 454 err_pm: 455 pm_runtime_disable(dev); 456 err_node: 457 of_node_put(private->mutex_node); 458 for (i = 0; i < DDP_COMPONENT_ID_MAX; i++) 459 of_node_put(private->comp_node[i]); 460 return ret; 461 } 462 463 static int mtk_drm_remove(struct platform_device *pdev) 464 { 465 struct mtk_drm_private *private = platform_get_drvdata(pdev); 466 struct drm_device *drm = private->drm; 467 int i; 468 469 drm_dev_unregister(drm); 470 mtk_drm_kms_deinit(drm); 471 drm_dev_unref(drm); 472 473 component_master_del(&pdev->dev, &mtk_drm_ops); 474 pm_runtime_disable(&pdev->dev); 475 of_node_put(private->mutex_node); 476 for (i = 0; i < DDP_COMPONENT_ID_MAX; i++) 477 of_node_put(private->comp_node[i]); 478 479 return 0; 480 } 481 482 #ifdef CONFIG_PM_SLEEP 483 static int mtk_drm_sys_suspend(struct device *dev) 484 { 485 struct mtk_drm_private *private = dev_get_drvdata(dev); 486 struct drm_device *drm = private->drm; 487 488 drm_kms_helper_poll_disable(drm); 489 490 private->suspend_state = drm_atomic_helper_suspend(drm); 491 if (IS_ERR(private->suspend_state)) { 492 drm_kms_helper_poll_enable(drm); 493 return PTR_ERR(private->suspend_state); 494 } 495 496 DRM_DEBUG_DRIVER("mtk_drm_sys_suspend\n"); 497 return 0; 498 } 499 500 static int mtk_drm_sys_resume(struct device *dev) 501 { 502 struct mtk_drm_private *private = dev_get_drvdata(dev); 503 struct drm_device *drm = private->drm; 504 505 drm_atomic_helper_resume(drm, private->suspend_state); 506 drm_kms_helper_poll_enable(drm); 507 508 DRM_DEBUG_DRIVER("mtk_drm_sys_resume\n"); 509 return 0; 510 } 511 #endif 512 513 static SIMPLE_DEV_PM_OPS(mtk_drm_pm_ops, mtk_drm_sys_suspend, 514 mtk_drm_sys_resume); 515 516 static const struct of_device_id mtk_drm_of_ids[] = { 517 { .compatible = "mediatek,mt8173-mmsys", }, 518 { } 519 }; 520 521 static struct platform_driver mtk_drm_platform_driver = { 522 .probe = mtk_drm_probe, 523 .remove = mtk_drm_remove, 524 .driver = { 525 .name = "mediatek-drm", 526 .of_match_table = mtk_drm_of_ids, 527 .pm = &mtk_drm_pm_ops, 528 }, 529 }; 530 531 static struct platform_driver * const mtk_drm_drivers[] = { 532 &mtk_ddp_driver, 533 &mtk_disp_ovl_driver, 534 &mtk_disp_rdma_driver, 535 &mtk_dpi_driver, 536 &mtk_drm_platform_driver, 537 &mtk_dsi_driver, 538 &mtk_mipi_tx_driver, 539 }; 540 541 static int __init mtk_drm_init(void) 542 { 543 int ret; 544 int i; 545 546 for (i = 0; i < ARRAY_SIZE(mtk_drm_drivers); i++) { 547 ret = platform_driver_register(mtk_drm_drivers[i]); 548 if (ret < 0) { 549 pr_err("Failed to register %s driver: %d\n", 550 mtk_drm_drivers[i]->driver.name, ret); 551 goto err; 552 } 553 } 554 555 return 0; 556 557 err: 558 while (--i >= 0) 559 platform_driver_unregister(mtk_drm_drivers[i]); 560 561 return ret; 562 } 563 564 static void __exit mtk_drm_exit(void) 565 { 566 int i; 567 568 for (i = ARRAY_SIZE(mtk_drm_drivers) - 1; i >= 0; i--) 569 platform_driver_unregister(mtk_drm_drivers[i]); 570 } 571 572 module_init(mtk_drm_init); 573 module_exit(mtk_drm_exit); 574 575 MODULE_AUTHOR("YT SHEN <yt.shen@mediatek.com>"); 576 MODULE_DESCRIPTION("Mediatek SoC DRM driver"); 577 MODULE_LICENSE("GPL v2"); 578