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