1 /* 2 * Copyright 2012 Advanced Micro Devices, Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 */ 23 24 #include <linux/pci.h> 25 #include <linux/acpi.h> 26 #include <linux/slab.h> 27 #include <linux/power_supply.h> 28 #include <linux/pm_runtime.h> 29 #include <acpi/video.h> 30 #include <drm/drmP.h> 31 #include <drm/drm_crtc_helper.h> 32 #include "amdgpu.h" 33 #include "amdgpu_pm.h" 34 #include "amd_acpi.h" 35 #include "atom.h" 36 37 struct amdgpu_atif_notification_cfg { 38 bool enabled; 39 int command_code; 40 }; 41 42 struct amdgpu_atif_notifications { 43 bool display_switch; 44 bool expansion_mode_change; 45 bool thermal_state; 46 bool forced_power_state; 47 bool system_power_state; 48 bool display_conf_change; 49 bool px_gfx_switch; 50 bool brightness_change; 51 bool dgpu_display_event; 52 }; 53 54 struct amdgpu_atif_functions { 55 bool system_params; 56 bool sbios_requests; 57 bool select_active_disp; 58 bool lid_state; 59 bool get_tv_standard; 60 bool set_tv_standard; 61 bool get_panel_expansion_mode; 62 bool set_panel_expansion_mode; 63 bool temperature_change; 64 bool graphics_device_types; 65 }; 66 67 struct amdgpu_atif { 68 acpi_handle handle; 69 70 struct amdgpu_atif_notifications notifications; 71 struct amdgpu_atif_functions functions; 72 struct amdgpu_atif_notification_cfg notification_cfg; 73 struct amdgpu_encoder *encoder_for_bl; 74 }; 75 76 /* Call the ATIF method 77 */ 78 /** 79 * amdgpu_atif_call - call an ATIF method 80 * 81 * @handle: acpi handle 82 * @function: the ATIF function to execute 83 * @params: ATIF function params 84 * 85 * Executes the requested ATIF function (all asics). 86 * Returns a pointer to the acpi output buffer. 87 */ 88 static union acpi_object *amdgpu_atif_call(struct amdgpu_atif *atif, 89 int function, 90 struct acpi_buffer *params) 91 { 92 acpi_status status; 93 union acpi_object atif_arg_elements[2]; 94 struct acpi_object_list atif_arg; 95 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 96 97 atif_arg.count = 2; 98 atif_arg.pointer = &atif_arg_elements[0]; 99 100 atif_arg_elements[0].type = ACPI_TYPE_INTEGER; 101 atif_arg_elements[0].integer.value = function; 102 103 if (params) { 104 atif_arg_elements[1].type = ACPI_TYPE_BUFFER; 105 atif_arg_elements[1].buffer.length = params->length; 106 atif_arg_elements[1].buffer.pointer = params->pointer; 107 } else { 108 /* We need a second fake parameter */ 109 atif_arg_elements[1].type = ACPI_TYPE_INTEGER; 110 atif_arg_elements[1].integer.value = 0; 111 } 112 113 status = acpi_evaluate_object(atif->handle, NULL, &atif_arg, 114 &buffer); 115 116 /* Fail only if calling the method fails and ATIF is supported */ 117 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 118 DRM_DEBUG_DRIVER("failed to evaluate ATIF got %s\n", 119 acpi_format_exception(status)); 120 kfree(buffer.pointer); 121 return NULL; 122 } 123 124 return buffer.pointer; 125 } 126 127 /** 128 * amdgpu_atif_parse_notification - parse supported notifications 129 * 130 * @n: supported notifications struct 131 * @mask: supported notifications mask from ATIF 132 * 133 * Use the supported notifications mask from ATIF function 134 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what notifications 135 * are supported (all asics). 136 */ 137 static void amdgpu_atif_parse_notification(struct amdgpu_atif_notifications *n, u32 mask) 138 { 139 n->display_switch = mask & ATIF_DISPLAY_SWITCH_REQUEST_SUPPORTED; 140 n->expansion_mode_change = mask & ATIF_EXPANSION_MODE_CHANGE_REQUEST_SUPPORTED; 141 n->thermal_state = mask & ATIF_THERMAL_STATE_CHANGE_REQUEST_SUPPORTED; 142 n->forced_power_state = mask & ATIF_FORCED_POWER_STATE_CHANGE_REQUEST_SUPPORTED; 143 n->system_power_state = mask & ATIF_SYSTEM_POWER_SOURCE_CHANGE_REQUEST_SUPPORTED; 144 n->display_conf_change = mask & ATIF_DISPLAY_CONF_CHANGE_REQUEST_SUPPORTED; 145 n->px_gfx_switch = mask & ATIF_PX_GFX_SWITCH_REQUEST_SUPPORTED; 146 n->brightness_change = mask & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST_SUPPORTED; 147 n->dgpu_display_event = mask & ATIF_DGPU_DISPLAY_EVENT_SUPPORTED; 148 } 149 150 /** 151 * amdgpu_atif_parse_functions - parse supported functions 152 * 153 * @f: supported functions struct 154 * @mask: supported functions mask from ATIF 155 * 156 * Use the supported functions mask from ATIF function 157 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what functions 158 * are supported (all asics). 159 */ 160 static void amdgpu_atif_parse_functions(struct amdgpu_atif_functions *f, u32 mask) 161 { 162 f->system_params = mask & ATIF_GET_SYSTEM_PARAMETERS_SUPPORTED; 163 f->sbios_requests = mask & ATIF_GET_SYSTEM_BIOS_REQUESTS_SUPPORTED; 164 f->select_active_disp = mask & ATIF_SELECT_ACTIVE_DISPLAYS_SUPPORTED; 165 f->lid_state = mask & ATIF_GET_LID_STATE_SUPPORTED; 166 f->get_tv_standard = mask & ATIF_GET_TV_STANDARD_FROM_CMOS_SUPPORTED; 167 f->set_tv_standard = mask & ATIF_SET_TV_STANDARD_IN_CMOS_SUPPORTED; 168 f->get_panel_expansion_mode = mask & ATIF_GET_PANEL_EXPANSION_MODE_FROM_CMOS_SUPPORTED; 169 f->set_panel_expansion_mode = mask & ATIF_SET_PANEL_EXPANSION_MODE_IN_CMOS_SUPPORTED; 170 f->temperature_change = mask & ATIF_TEMPERATURE_CHANGE_NOTIFICATION_SUPPORTED; 171 f->graphics_device_types = mask & ATIF_GET_GRAPHICS_DEVICE_TYPES_SUPPORTED; 172 } 173 174 /** 175 * amdgpu_atif_verify_interface - verify ATIF 176 * 177 * @handle: acpi handle 178 * @atif: amdgpu atif struct 179 * 180 * Execute the ATIF_FUNCTION_VERIFY_INTERFACE ATIF function 181 * to initialize ATIF and determine what features are supported 182 * (all asics). 183 * returns 0 on success, error on failure. 184 */ 185 static int amdgpu_atif_verify_interface(struct amdgpu_atif *atif) 186 { 187 union acpi_object *info; 188 struct atif_verify_interface output; 189 size_t size; 190 int err = 0; 191 192 info = amdgpu_atif_call(atif, ATIF_FUNCTION_VERIFY_INTERFACE, NULL); 193 if (!info) 194 return -EIO; 195 196 memset(&output, 0, sizeof(output)); 197 198 size = *(u16 *) info->buffer.pointer; 199 if (size < 12) { 200 DRM_INFO("ATIF buffer is too small: %zu\n", size); 201 err = -EINVAL; 202 goto out; 203 } 204 size = min(sizeof(output), size); 205 206 memcpy(&output, info->buffer.pointer, size); 207 208 /* TODO: check version? */ 209 DRM_DEBUG_DRIVER("ATIF version %u\n", output.version); 210 211 amdgpu_atif_parse_notification(&atif->notifications, output.notification_mask); 212 amdgpu_atif_parse_functions(&atif->functions, output.function_bits); 213 214 out: 215 kfree(info); 216 return err; 217 } 218 219 static acpi_handle amdgpu_atif_probe_handle(acpi_handle dhandle) 220 { 221 acpi_handle handle = NULL; 222 char acpi_method_name[255] = { 0 }; 223 struct acpi_buffer buffer = { sizeof(acpi_method_name), acpi_method_name }; 224 acpi_status status; 225 226 /* For PX/HG systems, ATIF and ATPX are in the iGPU's namespace, on dGPU only 227 * systems, ATIF is in the dGPU's namespace. 228 */ 229 status = acpi_get_handle(dhandle, "ATIF", &handle); 230 if (ACPI_SUCCESS(status)) 231 goto out; 232 233 if (amdgpu_has_atpx()) { 234 status = acpi_get_handle(amdgpu_atpx_get_dhandle(), "ATIF", 235 &handle); 236 if (ACPI_SUCCESS(status)) 237 goto out; 238 } 239 240 DRM_DEBUG_DRIVER("No ATIF handle found\n"); 241 return NULL; 242 out: 243 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 244 DRM_DEBUG_DRIVER("Found ATIF handle %s\n", acpi_method_name); 245 return handle; 246 } 247 248 /** 249 * amdgpu_atif_get_notification_params - determine notify configuration 250 * 251 * @handle: acpi handle 252 * @n: atif notification configuration struct 253 * 254 * Execute the ATIF_FUNCTION_GET_SYSTEM_PARAMETERS ATIF function 255 * to determine if a notifier is used and if so which one 256 * (all asics). This is either Notify(VGA, 0x81) or Notify(VGA, n) 257 * where n is specified in the result if a notifier is used. 258 * Returns 0 on success, error on failure. 259 */ 260 static int amdgpu_atif_get_notification_params(struct amdgpu_atif *atif) 261 { 262 union acpi_object *info; 263 struct amdgpu_atif_notification_cfg *n = &atif->notification_cfg; 264 struct atif_system_params params; 265 size_t size; 266 int err = 0; 267 268 info = amdgpu_atif_call(atif, ATIF_FUNCTION_GET_SYSTEM_PARAMETERS, 269 NULL); 270 if (!info) { 271 err = -EIO; 272 goto out; 273 } 274 275 size = *(u16 *) info->buffer.pointer; 276 if (size < 10) { 277 err = -EINVAL; 278 goto out; 279 } 280 281 memset(¶ms, 0, sizeof(params)); 282 size = min(sizeof(params), size); 283 memcpy(¶ms, info->buffer.pointer, size); 284 285 DRM_DEBUG_DRIVER("SYSTEM_PARAMS: mask = %#x, flags = %#x\n", 286 params.flags, params.valid_mask); 287 params.flags = params.flags & params.valid_mask; 288 289 if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_NONE) { 290 n->enabled = false; 291 n->command_code = 0; 292 } else if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_81) { 293 n->enabled = true; 294 n->command_code = 0x81; 295 } else { 296 if (size < 11) { 297 err = -EINVAL; 298 goto out; 299 } 300 n->enabled = true; 301 n->command_code = params.command_code; 302 } 303 304 out: 305 DRM_DEBUG_DRIVER("Notification %s, command code = %#x\n", 306 (n->enabled ? "enabled" : "disabled"), 307 n->command_code); 308 kfree(info); 309 return err; 310 } 311 312 /** 313 * amdgpu_atif_get_sbios_requests - get requested sbios event 314 * 315 * @handle: acpi handle 316 * @req: atif sbios request struct 317 * 318 * Execute the ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS ATIF function 319 * to determine what requests the sbios is making to the driver 320 * (all asics). 321 * Returns 0 on success, error on failure. 322 */ 323 static int amdgpu_atif_get_sbios_requests(struct amdgpu_atif *atif, 324 struct atif_sbios_requests *req) 325 { 326 union acpi_object *info; 327 size_t size; 328 int count = 0; 329 330 info = amdgpu_atif_call(atif, ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS, 331 NULL); 332 if (!info) 333 return -EIO; 334 335 size = *(u16 *)info->buffer.pointer; 336 if (size < 0xd) { 337 count = -EINVAL; 338 goto out; 339 } 340 memset(req, 0, sizeof(*req)); 341 342 size = min(sizeof(*req), size); 343 memcpy(req, info->buffer.pointer, size); 344 DRM_DEBUG_DRIVER("SBIOS pending requests: %#x\n", req->pending); 345 346 count = hweight32(req->pending); 347 348 out: 349 kfree(info); 350 return count; 351 } 352 353 /** 354 * amdgpu_atif_handler - handle ATIF notify requests 355 * 356 * @adev: amdgpu_device pointer 357 * @event: atif sbios request struct 358 * 359 * Checks the acpi event and if it matches an atif event, 360 * handles it. 361 * 362 * Returns: 363 * NOTIFY_BAD or NOTIFY_DONE, depending on the event. 364 */ 365 static int amdgpu_atif_handler(struct amdgpu_device *adev, 366 struct acpi_bus_event *event) 367 { 368 struct amdgpu_atif *atif = adev->atif; 369 int count; 370 371 DRM_DEBUG_DRIVER("event, device_class = %s, type = %#x\n", 372 event->device_class, event->type); 373 374 if (strcmp(event->device_class, ACPI_VIDEO_CLASS) != 0) 375 return NOTIFY_DONE; 376 377 /* Is this actually our event? */ 378 if (!atif || 379 !atif->notification_cfg.enabled || 380 event->type != atif->notification_cfg.command_code) { 381 /* These events will generate keypresses otherwise */ 382 if (event->type == ACPI_VIDEO_NOTIFY_PROBE) 383 return NOTIFY_BAD; 384 else 385 return NOTIFY_DONE; 386 } 387 388 if (atif->functions.sbios_requests) { 389 struct atif_sbios_requests req; 390 391 /* Check pending SBIOS requests */ 392 count = amdgpu_atif_get_sbios_requests(atif, &req); 393 394 if (count <= 0) 395 return NOTIFY_BAD; 396 397 DRM_DEBUG_DRIVER("ATIF: %d pending SBIOS requests\n", count); 398 399 /* todo: add DC handling */ 400 if ((req.pending & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST) && 401 !amdgpu_device_has_dc_support(adev)) { 402 struct amdgpu_encoder *enc = atif->encoder_for_bl; 403 404 if (enc) { 405 struct amdgpu_encoder_atom_dig *dig = enc->enc_priv; 406 407 DRM_DEBUG_DRIVER("Changing brightness to %d\n", 408 req.backlight_level); 409 410 amdgpu_display_backlight_set_level(adev, enc, req.backlight_level); 411 412 #if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE) 413 backlight_force_update(dig->bl_dev, 414 BACKLIGHT_UPDATE_HOTKEY); 415 #endif 416 } 417 } 418 if (req.pending & ATIF_DGPU_DISPLAY_EVENT) { 419 if (adev->flags & AMD_IS_PX) { 420 pm_runtime_get_sync(adev->ddev->dev); 421 /* Just fire off a uevent and let userspace tell us what to do */ 422 drm_helper_hpd_irq_event(adev->ddev); 423 pm_runtime_mark_last_busy(adev->ddev->dev); 424 pm_runtime_put_autosuspend(adev->ddev->dev); 425 } 426 } 427 /* TODO: check other events */ 428 } 429 430 /* We've handled the event, stop the notifier chain. The ACPI interface 431 * overloads ACPI_VIDEO_NOTIFY_PROBE, we don't want to send that to 432 * userspace if the event was generated only to signal a SBIOS 433 * request. 434 */ 435 return NOTIFY_BAD; 436 } 437 438 /* Call the ATCS method 439 */ 440 /** 441 * amdgpu_atcs_call - call an ATCS method 442 * 443 * @handle: acpi handle 444 * @function: the ATCS function to execute 445 * @params: ATCS function params 446 * 447 * Executes the requested ATCS function (all asics). 448 * Returns a pointer to the acpi output buffer. 449 */ 450 static union acpi_object *amdgpu_atcs_call(acpi_handle handle, int function, 451 struct acpi_buffer *params) 452 { 453 acpi_status status; 454 union acpi_object atcs_arg_elements[2]; 455 struct acpi_object_list atcs_arg; 456 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 457 458 atcs_arg.count = 2; 459 atcs_arg.pointer = &atcs_arg_elements[0]; 460 461 atcs_arg_elements[0].type = ACPI_TYPE_INTEGER; 462 atcs_arg_elements[0].integer.value = function; 463 464 if (params) { 465 atcs_arg_elements[1].type = ACPI_TYPE_BUFFER; 466 atcs_arg_elements[1].buffer.length = params->length; 467 atcs_arg_elements[1].buffer.pointer = params->pointer; 468 } else { 469 /* We need a second fake parameter */ 470 atcs_arg_elements[1].type = ACPI_TYPE_INTEGER; 471 atcs_arg_elements[1].integer.value = 0; 472 } 473 474 status = acpi_evaluate_object(handle, "ATCS", &atcs_arg, &buffer); 475 476 /* Fail only if calling the method fails and ATIF is supported */ 477 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 478 DRM_DEBUG_DRIVER("failed to evaluate ATCS got %s\n", 479 acpi_format_exception(status)); 480 kfree(buffer.pointer); 481 return NULL; 482 } 483 484 return buffer.pointer; 485 } 486 487 /** 488 * amdgpu_atcs_parse_functions - parse supported functions 489 * 490 * @f: supported functions struct 491 * @mask: supported functions mask from ATCS 492 * 493 * Use the supported functions mask from ATCS function 494 * ATCS_FUNCTION_VERIFY_INTERFACE to determine what functions 495 * are supported (all asics). 496 */ 497 static void amdgpu_atcs_parse_functions(struct amdgpu_atcs_functions *f, u32 mask) 498 { 499 f->get_ext_state = mask & ATCS_GET_EXTERNAL_STATE_SUPPORTED; 500 f->pcie_perf_req = mask & ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED; 501 f->pcie_dev_rdy = mask & ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED; 502 f->pcie_bus_width = mask & ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED; 503 } 504 505 /** 506 * amdgpu_atcs_verify_interface - verify ATCS 507 * 508 * @handle: acpi handle 509 * @atcs: amdgpu atcs struct 510 * 511 * Execute the ATCS_FUNCTION_VERIFY_INTERFACE ATCS function 512 * to initialize ATCS and determine what features are supported 513 * (all asics). 514 * returns 0 on success, error on failure. 515 */ 516 static int amdgpu_atcs_verify_interface(acpi_handle handle, 517 struct amdgpu_atcs *atcs) 518 { 519 union acpi_object *info; 520 struct atcs_verify_interface output; 521 size_t size; 522 int err = 0; 523 524 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_VERIFY_INTERFACE, NULL); 525 if (!info) 526 return -EIO; 527 528 memset(&output, 0, sizeof(output)); 529 530 size = *(u16 *) info->buffer.pointer; 531 if (size < 8) { 532 DRM_INFO("ATCS buffer is too small: %zu\n", size); 533 err = -EINVAL; 534 goto out; 535 } 536 size = min(sizeof(output), size); 537 538 memcpy(&output, info->buffer.pointer, size); 539 540 /* TODO: check version? */ 541 DRM_DEBUG_DRIVER("ATCS version %u\n", output.version); 542 543 amdgpu_atcs_parse_functions(&atcs->functions, output.function_bits); 544 545 out: 546 kfree(info); 547 return err; 548 } 549 550 /** 551 * amdgpu_acpi_is_pcie_performance_request_supported 552 * 553 * @adev: amdgpu_device pointer 554 * 555 * Check if the ATCS pcie_perf_req and pcie_dev_rdy methods 556 * are supported (all asics). 557 * returns true if supported, false if not. 558 */ 559 bool amdgpu_acpi_is_pcie_performance_request_supported(struct amdgpu_device *adev) 560 { 561 struct amdgpu_atcs *atcs = &adev->atcs; 562 563 if (atcs->functions.pcie_perf_req && atcs->functions.pcie_dev_rdy) 564 return true; 565 566 return false; 567 } 568 569 /** 570 * amdgpu_acpi_pcie_notify_device_ready 571 * 572 * @adev: amdgpu_device pointer 573 * 574 * Executes the PCIE_DEVICE_READY_NOTIFICATION method 575 * (all asics). 576 * returns 0 on success, error on failure. 577 */ 578 int amdgpu_acpi_pcie_notify_device_ready(struct amdgpu_device *adev) 579 { 580 acpi_handle handle; 581 union acpi_object *info; 582 struct amdgpu_atcs *atcs = &adev->atcs; 583 584 /* Get the device handle */ 585 handle = ACPI_HANDLE(&adev->pdev->dev); 586 if (!handle) 587 return -EINVAL; 588 589 if (!atcs->functions.pcie_dev_rdy) 590 return -EINVAL; 591 592 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION, NULL); 593 if (!info) 594 return -EIO; 595 596 kfree(info); 597 598 return 0; 599 } 600 601 /** 602 * amdgpu_acpi_pcie_performance_request 603 * 604 * @adev: amdgpu_device pointer 605 * @perf_req: requested perf level (pcie gen speed) 606 * @advertise: set advertise caps flag if set 607 * 608 * Executes the PCIE_PERFORMANCE_REQUEST method to 609 * change the pcie gen speed (all asics). 610 * returns 0 on success, error on failure. 611 */ 612 int amdgpu_acpi_pcie_performance_request(struct amdgpu_device *adev, 613 u8 perf_req, bool advertise) 614 { 615 acpi_handle handle; 616 union acpi_object *info; 617 struct amdgpu_atcs *atcs = &adev->atcs; 618 struct atcs_pref_req_input atcs_input; 619 struct atcs_pref_req_output atcs_output; 620 struct acpi_buffer params; 621 size_t size; 622 u32 retry = 3; 623 624 if (amdgpu_acpi_pcie_notify_device_ready(adev)) 625 return -EINVAL; 626 627 /* Get the device handle */ 628 handle = ACPI_HANDLE(&adev->pdev->dev); 629 if (!handle) 630 return -EINVAL; 631 632 if (!atcs->functions.pcie_perf_req) 633 return -EINVAL; 634 635 atcs_input.size = sizeof(struct atcs_pref_req_input); 636 /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */ 637 atcs_input.client_id = adev->pdev->devfn | (adev->pdev->bus->number << 8); 638 atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK; 639 atcs_input.flags = ATCS_WAIT_FOR_COMPLETION; 640 if (advertise) 641 atcs_input.flags |= ATCS_ADVERTISE_CAPS; 642 atcs_input.req_type = ATCS_PCIE_LINK_SPEED; 643 atcs_input.perf_req = perf_req; 644 645 params.length = sizeof(struct atcs_pref_req_input); 646 params.pointer = &atcs_input; 647 648 while (retry--) { 649 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST, ¶ms); 650 if (!info) 651 return -EIO; 652 653 memset(&atcs_output, 0, sizeof(atcs_output)); 654 655 size = *(u16 *) info->buffer.pointer; 656 if (size < 3) { 657 DRM_INFO("ATCS buffer is too small: %zu\n", size); 658 kfree(info); 659 return -EINVAL; 660 } 661 size = min(sizeof(atcs_output), size); 662 663 memcpy(&atcs_output, info->buffer.pointer, size); 664 665 kfree(info); 666 667 switch (atcs_output.ret_val) { 668 case ATCS_REQUEST_REFUSED: 669 default: 670 return -EINVAL; 671 case ATCS_REQUEST_COMPLETE: 672 return 0; 673 case ATCS_REQUEST_IN_PROGRESS: 674 udelay(10); 675 break; 676 } 677 } 678 679 return 0; 680 } 681 682 /** 683 * amdgpu_acpi_event - handle notify events 684 * 685 * @nb: notifier block 686 * @val: val 687 * @data: acpi event 688 * 689 * Calls relevant amdgpu functions in response to various 690 * acpi events. 691 * Returns NOTIFY code 692 */ 693 static int amdgpu_acpi_event(struct notifier_block *nb, 694 unsigned long val, 695 void *data) 696 { 697 struct amdgpu_device *adev = container_of(nb, struct amdgpu_device, acpi_nb); 698 struct acpi_bus_event *entry = (struct acpi_bus_event *)data; 699 700 if (strcmp(entry->device_class, ACPI_AC_CLASS) == 0) { 701 if (power_supply_is_system_supplied() > 0) 702 DRM_DEBUG_DRIVER("pm: AC\n"); 703 else 704 DRM_DEBUG_DRIVER("pm: DC\n"); 705 706 amdgpu_pm_acpi_event_handler(adev); 707 } 708 709 /* Check for pending SBIOS requests */ 710 return amdgpu_atif_handler(adev, entry); 711 } 712 713 /* Call all ACPI methods here */ 714 /** 715 * amdgpu_acpi_init - init driver acpi support 716 * 717 * @adev: amdgpu_device pointer 718 * 719 * Verifies the AMD ACPI interfaces and registers with the acpi 720 * notifier chain (all asics). 721 * Returns 0 on success, error on failure. 722 */ 723 int amdgpu_acpi_init(struct amdgpu_device *adev) 724 { 725 acpi_handle handle, atif_handle; 726 struct amdgpu_atif *atif; 727 struct amdgpu_atcs *atcs = &adev->atcs; 728 int ret; 729 730 /* Get the device handle */ 731 handle = ACPI_HANDLE(&adev->pdev->dev); 732 733 if (!adev->bios || !handle) 734 return 0; 735 736 /* Call the ATCS method */ 737 ret = amdgpu_atcs_verify_interface(handle, atcs); 738 if (ret) { 739 DRM_DEBUG_DRIVER("Call to ATCS verify_interface failed: %d\n", ret); 740 } 741 742 /* Probe for ATIF, and initialize it if found */ 743 atif_handle = amdgpu_atif_probe_handle(handle); 744 if (!atif_handle) 745 goto out; 746 747 atif = kzalloc(sizeof(*atif), GFP_KERNEL); 748 if (!atif) { 749 DRM_WARN("Not enough memory to initialize ATIF\n"); 750 goto out; 751 } 752 atif->handle = atif_handle; 753 754 /* Call the ATIF method */ 755 ret = amdgpu_atif_verify_interface(atif); 756 if (ret) { 757 DRM_DEBUG_DRIVER("Call to ATIF verify_interface failed: %d\n", ret); 758 kfree(atif); 759 goto out; 760 } 761 adev->atif = atif; 762 763 if (atif->notifications.brightness_change) { 764 struct drm_encoder *tmp; 765 766 /* Find the encoder controlling the brightness */ 767 list_for_each_entry(tmp, &adev->ddev->mode_config.encoder_list, 768 head) { 769 struct amdgpu_encoder *enc = to_amdgpu_encoder(tmp); 770 771 if ((enc->devices & (ATOM_DEVICE_LCD_SUPPORT)) && 772 enc->enc_priv) { 773 struct amdgpu_encoder_atom_dig *dig = enc->enc_priv; 774 if (dig->bl_dev) { 775 atif->encoder_for_bl = enc; 776 break; 777 } 778 } 779 } 780 } 781 782 if (atif->functions.sbios_requests && !atif->functions.system_params) { 783 /* XXX check this workraround, if sbios request function is 784 * present we have to see how it's configured in the system 785 * params 786 */ 787 atif->functions.system_params = true; 788 } 789 790 if (atif->functions.system_params) { 791 ret = amdgpu_atif_get_notification_params(atif); 792 if (ret) { 793 DRM_DEBUG_DRIVER("Call to GET_SYSTEM_PARAMS failed: %d\n", 794 ret); 795 /* Disable notification */ 796 atif->notification_cfg.enabled = false; 797 } 798 } 799 800 out: 801 adev->acpi_nb.notifier_call = amdgpu_acpi_event; 802 register_acpi_notifier(&adev->acpi_nb); 803 804 return ret; 805 } 806 807 /** 808 * amdgpu_acpi_fini - tear down driver acpi support 809 * 810 * @adev: amdgpu_device pointer 811 * 812 * Unregisters with the acpi notifier chain (all asics). 813 */ 814 void amdgpu_acpi_fini(struct amdgpu_device *adev) 815 { 816 unregister_acpi_notifier(&adev->acpi_nb); 817 if (adev->atif) 818 kfree(adev->atif); 819 } 820