drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c

   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(&params, 0, sizeof(params));
 282         size = min(sizeof(params), size);
 283         memcpy(&params, 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, &params);
 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 }