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/vga_switcheroo.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_acpi.h"
  34 #include "atom.h"
  35
  36 #define ACPI_AC_CLASS           "ac_adapter"
  37
  38 extern void amdgpu_pm_acpi_event_handler(struct amdgpu_device *adev);
  39
  40 struct atif_verify_interface {
  41         u16 size;               /* structure size in bytes (includes size field) */
  42         u16 version;            /* version */
  43         u32 notification_mask;  /* supported notifications mask */
  44         u32 function_bits;      /* supported functions bit vector */
  45 } __packed;
  46
  47 struct atif_system_params {
  48         u16 size;               /* structure size in bytes (includes size field) */
  49         u32 valid_mask;         /* valid flags mask */
  50         u32 flags;              /* flags */
  51         u8 command_code;        /* notify command code */
  52 } __packed;
  53
  54 struct atif_sbios_requests {
  55         u16 size;               /* structure size in bytes (includes size field) */
  56         u32 pending;            /* pending sbios requests */
  57         u8 panel_exp_mode;      /* panel expansion mode */
  58         u8 thermal_gfx;         /* thermal state: target gfx controller */
  59         u8 thermal_state;       /* thermal state: state id (0: exit state, non-0: state) */
  60         u8 forced_power_gfx;    /* forced power state: target gfx controller */
  61         u8 forced_power_state;  /* forced power state: state id */
  62         u8 system_power_src;    /* system power source */
  63         u8 backlight_level;     /* panel backlight level (0-255) */
  64 } __packed;
  65
  66 #define ATIF_NOTIFY_MASK        0x3
  67 #define ATIF_NOTIFY_NONE        0
  68 #define ATIF_NOTIFY_81          1
  69 #define ATIF_NOTIFY_N           2
  70
  71 struct atcs_verify_interface {
  72         u16 size;               /* structure size in bytes (includes size field) */
  73         u16 version;            /* version */
  74         u32 function_bits;      /* supported functions bit vector */
  75 } __packed;
  76
  77 #define ATCS_VALID_FLAGS_MASK   0x3
  78
  79 struct atcs_pref_req_input {
  80         u16 size;               /* structure size in bytes (includes size field) */
  81         u16 client_id;          /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
  82         u16 valid_flags_mask;   /* valid flags mask */
  83         u16 flags;              /* flags */
  84         u8 req_type;            /* request type */
  85         u8 perf_req;            /* performance request */
  86 } __packed;
  87
  88 struct atcs_pref_req_output {
  89         u16 size;               /* structure size in bytes (includes size field) */
  90         u8 ret_val;             /* return value */
  91 } __packed;
  92
  93 /* Call the ATIF method
  94  */
  95 /**
  96  * amdgpu_atif_call - call an ATIF method
  97  *
  98  * @handle: acpi handle
  99  * @function: the ATIF function to execute
 100  * @params: ATIF function params
 101  *
 102  * Executes the requested ATIF function (all asics).
 103  * Returns a pointer to the acpi output buffer.
 104  */
 105 static union acpi_object *amdgpu_atif_call(acpi_handle handle, int function,
 106                 struct acpi_buffer *params)
 107 {
 108         acpi_status status;
 109         union acpi_object atif_arg_elements[2];
 110         struct acpi_object_list atif_arg;
 111         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 112
 113         atif_arg.count = 2;
 114         atif_arg.pointer = &atif_arg_elements[0];
 115
 116         atif_arg_elements[0].type = ACPI_TYPE_INTEGER;
 117         atif_arg_elements[0].integer.value = function;
 118
 119         if (params) {
 120                 atif_arg_elements[1].type = ACPI_TYPE_BUFFER;
 121                 atif_arg_elements[1].buffer.length = params->length;
 122                 atif_arg_elements[1].buffer.pointer = params->pointer;
 123         } else {
 124                 /* We need a second fake parameter */
 125                 atif_arg_elements[1].type = ACPI_TYPE_INTEGER;
 126                 atif_arg_elements[1].integer.value = 0;
 127         }
 128
 129         status = acpi_evaluate_object(handle, "ATIF", &atif_arg, &buffer);
 130
 131         /* Fail only if calling the method fails and ATIF is supported */
 132         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 133                 DRM_DEBUG_DRIVER("failed to evaluate ATIF got %s\n",
 134                                  acpi_format_exception(status));
 135                 kfree(buffer.pointer);
 136                 return NULL;
 137         }
 138
 139         return buffer.pointer;
 140 }
 141
 142 /**
 143  * amdgpu_atif_parse_notification - parse supported notifications
 144  *
 145  * @n: supported notifications struct
 146  * @mask: supported notifications mask from ATIF
 147  *
 148  * Use the supported notifications mask from ATIF function
 149  * ATIF_FUNCTION_VERIFY_INTERFACE to determine what notifications
 150  * are supported (all asics).
 151  */
 152 static void amdgpu_atif_parse_notification(struct amdgpu_atif_notifications *n, u32 mask)
 153 {
 154         n->display_switch = mask & ATIF_DISPLAY_SWITCH_REQUEST_SUPPORTED;
 155         n->expansion_mode_change = mask & ATIF_EXPANSION_MODE_CHANGE_REQUEST_SUPPORTED;
 156         n->thermal_state = mask & ATIF_THERMAL_STATE_CHANGE_REQUEST_SUPPORTED;
 157         n->forced_power_state = mask & ATIF_FORCED_POWER_STATE_CHANGE_REQUEST_SUPPORTED;
 158         n->system_power_state = mask & ATIF_SYSTEM_POWER_SOURCE_CHANGE_REQUEST_SUPPORTED;
 159         n->display_conf_change = mask & ATIF_DISPLAY_CONF_CHANGE_REQUEST_SUPPORTED;
 160         n->px_gfx_switch = mask & ATIF_PX_GFX_SWITCH_REQUEST_SUPPORTED;
 161         n->brightness_change = mask & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST_SUPPORTED;
 162         n->dgpu_display_event = mask & ATIF_DGPU_DISPLAY_EVENT_SUPPORTED;
 163 }
 164
 165 /**
 166  * amdgpu_atif_parse_functions - parse supported functions
 167  *
 168  * @f: supported functions struct
 169  * @mask: supported functions mask from ATIF
 170  *
 171  * Use the supported functions mask from ATIF function
 172  * ATIF_FUNCTION_VERIFY_INTERFACE to determine what functions
 173  * are supported (all asics).
 174  */
 175 static void amdgpu_atif_parse_functions(struct amdgpu_atif_functions *f, u32 mask)
 176 {
 177         f->system_params = mask & ATIF_GET_SYSTEM_PARAMETERS_SUPPORTED;
 178         f->sbios_requests = mask & ATIF_GET_SYSTEM_BIOS_REQUESTS_SUPPORTED;
 179         f->select_active_disp = mask & ATIF_SELECT_ACTIVE_DISPLAYS_SUPPORTED;
 180         f->lid_state = mask & ATIF_GET_LID_STATE_SUPPORTED;
 181         f->get_tv_standard = mask & ATIF_GET_TV_STANDARD_FROM_CMOS_SUPPORTED;
 182         f->set_tv_standard = mask & ATIF_SET_TV_STANDARD_IN_CMOS_SUPPORTED;
 183         f->get_panel_expansion_mode = mask & ATIF_GET_PANEL_EXPANSION_MODE_FROM_CMOS_SUPPORTED;
 184         f->set_panel_expansion_mode = mask & ATIF_SET_PANEL_EXPANSION_MODE_IN_CMOS_SUPPORTED;
 185         f->temperature_change = mask & ATIF_TEMPERATURE_CHANGE_NOTIFICATION_SUPPORTED;
 186         f->graphics_device_types = mask & ATIF_GET_GRAPHICS_DEVICE_TYPES_SUPPORTED;
 187 }
 188
 189 /**
 190  * amdgpu_atif_verify_interface - verify ATIF
 191  *
 192  * @handle: acpi handle
 193  * @atif: amdgpu atif struct
 194  *
 195  * Execute the ATIF_FUNCTION_VERIFY_INTERFACE ATIF function
 196  * to initialize ATIF and determine what features are supported
 197  * (all asics).
 198  * returns 0 on success, error on failure.
 199  */
 200 static int amdgpu_atif_verify_interface(acpi_handle handle,
 201                 struct amdgpu_atif *atif)
 202 {
 203         union acpi_object *info;
 204         struct atif_verify_interface output;
 205         size_t size;
 206         int err = 0;
 207
 208         info = amdgpu_atif_call(handle, ATIF_FUNCTION_VERIFY_INTERFACE, NULL);
 209         if (!info)
 210                 return -EIO;
 211
 212         memset(&output, 0, sizeof(output));
 213
 214         size = *(u16 *) info->buffer.pointer;
 215         if (size < 12) {
 216                 DRM_INFO("ATIF buffer is too small: %zu\n", size);
 217                 err = -EINVAL;
 218                 goto out;
 219         }
 220         size = min(sizeof(output), size);
 221
 222         memcpy(&output, info->buffer.pointer, size);
 223
 224         /* TODO: check version? */
 225         DRM_DEBUG_DRIVER("ATIF version %u\n", output.version);
 226
 227         amdgpu_atif_parse_notification(&atif->notifications, output.notification_mask);
 228         amdgpu_atif_parse_functions(&atif->functions, output.function_bits);
 229
 230 out:
 231         kfree(info);
 232         return err;
 233 }
 234
 235 /**
 236  * amdgpu_atif_get_notification_params - determine notify configuration
 237  *
 238  * @handle: acpi handle
 239  * @n: atif notification configuration struct
 240  *
 241  * Execute the ATIF_FUNCTION_GET_SYSTEM_PARAMETERS ATIF function
 242  * to determine if a notifier is used and if so which one
 243  * (all asics).  This is either Notify(VGA, 0x81) or Notify(VGA, n)
 244  * where n is specified in the result if a notifier is used.
 245  * Returns 0 on success, error on failure.
 246  */
 247 static int amdgpu_atif_get_notification_params(acpi_handle handle,
 248                 struct amdgpu_atif_notification_cfg *n)
 249 {
 250         union acpi_object *info;
 251         struct atif_system_params params;
 252         size_t size;
 253         int err = 0;
 254
 255         info = amdgpu_atif_call(handle, ATIF_FUNCTION_GET_SYSTEM_PARAMETERS, NULL);
 256         if (!info) {
 257                 err = -EIO;
 258                 goto out;
 259         }
 260
 261         size = *(u16 *) info->buffer.pointer;
 262         if (size < 10) {
 263                 err = -EINVAL;
 264                 goto out;
 265         }
 266
 267         memset(&params, 0, sizeof(params));
 268         size = min(sizeof(params), size);
 269         memcpy(&params, info->buffer.pointer, size);
 270
 271         DRM_DEBUG_DRIVER("SYSTEM_PARAMS: mask = %#x, flags = %#x\n",
 272                         params.flags, params.valid_mask);
 273         params.flags = params.flags & params.valid_mask;
 274
 275         if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_NONE) {
 276                 n->enabled = false;
 277                 n->command_code = 0;
 278         } else if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_81) {
 279                 n->enabled = true;
 280                 n->command_code = 0x81;
 281         } else {
 282                 if (size < 11) {
 283                         err = -EINVAL;
 284                         goto out;
 285                 }
 286                 n->enabled = true;
 287                 n->command_code = params.command_code;
 288         }
 289
 290 out:
 291         DRM_DEBUG_DRIVER("Notification %s, command code = %#x\n",
 292                         (n->enabled ? "enabled" : "disabled"),
 293                         n->command_code);
 294         kfree(info);
 295         return err;
 296 }
 297
 298 /**
 299  * amdgpu_atif_get_sbios_requests - get requested sbios event
 300  *
 301  * @handle: acpi handle
 302  * @req: atif sbios request struct
 303  *
 304  * Execute the ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS ATIF function
 305  * to determine what requests the sbios is making to the driver
 306  * (all asics).
 307  * Returns 0 on success, error on failure.
 308  */
 309 static int amdgpu_atif_get_sbios_requests(acpi_handle handle,
 310                 struct atif_sbios_requests *req)
 311 {
 312         union acpi_object *info;
 313         size_t size;
 314         int count = 0;
 315
 316         info = amdgpu_atif_call(handle, ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS, NULL);
 317         if (!info)
 318                 return -EIO;
 319
 320         size = *(u16 *)info->buffer.pointer;
 321         if (size < 0xd) {
 322                 count = -EINVAL;
 323                 goto out;
 324         }
 325         memset(req, 0, sizeof(*req));
 326
 327         size = min(sizeof(*req), size);
 328         memcpy(req, info->buffer.pointer, size);
 329         DRM_DEBUG_DRIVER("SBIOS pending requests: %#x\n", req->pending);
 330
 331         count = hweight32(req->pending);
 332
 333 out:
 334         kfree(info);
 335         return count;
 336 }
 337
 338 /**
 339  * amdgpu_atif_handler - handle ATIF notify requests
 340  *
 341  * @adev: amdgpu_device pointer
 342  * @event: atif sbios request struct
 343  *
 344  * Checks the acpi event and if it matches an atif event,
 345  * handles it.
 346  * Returns NOTIFY code
 347  */
 348 int amdgpu_atif_handler(struct amdgpu_device *adev,
 349                         struct acpi_bus_event *event)
 350 {
 351         struct amdgpu_atif *atif = &adev->atif;
 352         struct atif_sbios_requests req;
 353         acpi_handle handle;
 354         int count;
 355
 356         DRM_DEBUG_DRIVER("event, device_class = %s, type = %#x\n",
 357                         event->device_class, event->type);
 358
 359         if (strcmp(event->device_class, ACPI_VIDEO_CLASS) != 0)
 360                 return NOTIFY_DONE;
 361
 362         if (!atif->notification_cfg.enabled ||
 363             event->type != atif->notification_cfg.command_code)
 364                 /* Not our event */
 365                 return NOTIFY_DONE;
 366
 367         /* Check pending SBIOS requests */
 368         handle = ACPI_HANDLE(&adev->pdev->dev);
 369         count = amdgpu_atif_get_sbios_requests(handle, &req);
 370
 371         if (count <= 0)
 372                 return NOTIFY_DONE;
 373
 374         DRM_DEBUG_DRIVER("ATIF: %d pending SBIOS requests\n", count);
 375
 376         if (req.pending & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST) {
 377                 struct amdgpu_encoder *enc = atif->encoder_for_bl;
 378
 379                 if (enc) {
 380                         struct amdgpu_encoder_atom_dig *dig = enc->enc_priv;
 381
 382                         DRM_DEBUG_DRIVER("Changing brightness to %d\n",
 383                                         req.backlight_level);
 384
 385                         amdgpu_display_backlight_set_level(adev, enc, req.backlight_level);
 386
 387 #if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
 388                         backlight_force_update(dig->bl_dev,
 389                                                BACKLIGHT_UPDATE_HOTKEY);
 390 #endif
 391                 }
 392         }
 393         /* TODO: check other events */
 394
 395         /* We've handled the event, stop the notifier chain. The ACPI interface
 396          * overloads ACPI_VIDEO_NOTIFY_PROBE, we don't want to send that to
 397          * userspace if the event was generated only to signal a SBIOS
 398          * request.
 399          */
 400         return NOTIFY_BAD;
 401 }
 402
 403 /* Call the ATCS method
 404  */
 405 /**
 406  * amdgpu_atcs_call - call an ATCS method
 407  *
 408  * @handle: acpi handle
 409  * @function: the ATCS function to execute
 410  * @params: ATCS function params
 411  *
 412  * Executes the requested ATCS function (all asics).
 413  * Returns a pointer to the acpi output buffer.
 414  */
 415 static union acpi_object *amdgpu_atcs_call(acpi_handle handle, int function,
 416                                            struct acpi_buffer *params)
 417 {
 418         acpi_status status;
 419         union acpi_object atcs_arg_elements[2];
 420         struct acpi_object_list atcs_arg;
 421         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 422
 423         atcs_arg.count = 2;
 424         atcs_arg.pointer = &atcs_arg_elements[0];
 425
 426         atcs_arg_elements[0].type = ACPI_TYPE_INTEGER;
 427         atcs_arg_elements[0].integer.value = function;
 428
 429         if (params) {
 430                 atcs_arg_elements[1].type = ACPI_TYPE_BUFFER;
 431                 atcs_arg_elements[1].buffer.length = params->length;
 432                 atcs_arg_elements[1].buffer.pointer = params->pointer;
 433         } else {
 434                 /* We need a second fake parameter */
 435                 atcs_arg_elements[1].type = ACPI_TYPE_INTEGER;
 436                 atcs_arg_elements[1].integer.value = 0;
 437         }
 438
 439         status = acpi_evaluate_object(handle, "ATCS", &atcs_arg, &buffer);
 440
 441         /* Fail only if calling the method fails and ATIF is supported */
 442         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 443                 DRM_DEBUG_DRIVER("failed to evaluate ATCS got %s\n",
 444                                  acpi_format_exception(status));
 445                 kfree(buffer.pointer);
 446                 return NULL;
 447         }
 448
 449         return buffer.pointer;
 450 }
 451
 452 /**
 453  * amdgpu_atcs_parse_functions - parse supported functions
 454  *
 455  * @f: supported functions struct
 456  * @mask: supported functions mask from ATCS
 457  *
 458  * Use the supported functions mask from ATCS function
 459  * ATCS_FUNCTION_VERIFY_INTERFACE to determine what functions
 460  * are supported (all asics).
 461  */
 462 static void amdgpu_atcs_parse_functions(struct amdgpu_atcs_functions *f, u32 mask)
 463 {
 464         f->get_ext_state = mask & ATCS_GET_EXTERNAL_STATE_SUPPORTED;
 465         f->pcie_perf_req = mask & ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED;
 466         f->pcie_dev_rdy = mask & ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED;
 467         f->pcie_bus_width = mask & ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED;
 468 }
 469
 470 /**
 471  * amdgpu_atcs_verify_interface - verify ATCS
 472  *
 473  * @handle: acpi handle
 474  * @atcs: amdgpu atcs struct
 475  *
 476  * Execute the ATCS_FUNCTION_VERIFY_INTERFACE ATCS function
 477  * to initialize ATCS and determine what features are supported
 478  * (all asics).
 479  * returns 0 on success, error on failure.
 480  */
 481 static int amdgpu_atcs_verify_interface(acpi_handle handle,
 482                                         struct amdgpu_atcs *atcs)
 483 {
 484         union acpi_object *info;
 485         struct atcs_verify_interface output;
 486         size_t size;
 487         int err = 0;
 488
 489         info = amdgpu_atcs_call(handle, ATCS_FUNCTION_VERIFY_INTERFACE, NULL);
 490         if (!info)
 491                 return -EIO;
 492
 493         memset(&output, 0, sizeof(output));
 494
 495         size = *(u16 *) info->buffer.pointer;
 496         if (size < 8) {
 497                 DRM_INFO("ATCS buffer is too small: %zu\n", size);
 498                 err = -EINVAL;
 499                 goto out;
 500         }
 501         size = min(sizeof(output), size);
 502
 503         memcpy(&output, info->buffer.pointer, size);
 504
 505         /* TODO: check version? */
 506         DRM_DEBUG_DRIVER("ATCS version %u\n", output.version);
 507
 508         amdgpu_atcs_parse_functions(&atcs->functions, output.function_bits);
 509
 510 out:
 511         kfree(info);
 512         return err;
 513 }
 514
 515 /**
 516  * amdgpu_acpi_is_pcie_performance_request_supported
 517  *
 518  * @adev: amdgpu_device pointer
 519  *
 520  * Check if the ATCS pcie_perf_req and pcie_dev_rdy methods
 521  * are supported (all asics).
 522  * returns true if supported, false if not.
 523  */
 524 bool amdgpu_acpi_is_pcie_performance_request_supported(struct amdgpu_device *adev)
 525 {
 526         struct amdgpu_atcs *atcs = &adev->atcs;
 527
 528         if (atcs->functions.pcie_perf_req && atcs->functions.pcie_dev_rdy)
 529                 return true;
 530
 531         return false;
 532 }
 533
 534 /**
 535  * amdgpu_acpi_pcie_notify_device_ready
 536  *
 537  * @adev: amdgpu_device pointer
 538  *
 539  * Executes the PCIE_DEVICE_READY_NOTIFICATION method
 540  * (all asics).
 541  * returns 0 on success, error on failure.
 542  */
 543 int amdgpu_acpi_pcie_notify_device_ready(struct amdgpu_device *adev)
 544 {
 545         acpi_handle handle;
 546         union acpi_object *info;
 547         struct amdgpu_atcs *atcs = &adev->atcs;
 548
 549         /* Get the device handle */
 550         handle = ACPI_HANDLE(&adev->pdev->dev);
 551         if (!handle)
 552                 return -EINVAL;
 553
 554         if (!atcs->functions.pcie_dev_rdy)
 555                 return -EINVAL;
 556
 557         info = amdgpu_atcs_call(handle, ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION, NULL);
 558         if (!info)
 559                 return -EIO;
 560
 561         kfree(info);
 562
 563         return 0;
 564 }
 565
 566 /**
 567  * amdgpu_acpi_pcie_performance_request
 568  *
 569  * @adev: amdgpu_device pointer
 570  * @perf_req: requested perf level (pcie gen speed)
 571  * @advertise: set advertise caps flag if set
 572  *
 573  * Executes the PCIE_PERFORMANCE_REQUEST method to
 574  * change the pcie gen speed (all asics).
 575  * returns 0 on success, error on failure.
 576  */
 577 int amdgpu_acpi_pcie_performance_request(struct amdgpu_device *adev,
 578                                          u8 perf_req, bool advertise)
 579 {
 580         acpi_handle handle;
 581         union acpi_object *info;
 582         struct amdgpu_atcs *atcs = &adev->atcs;
 583         struct atcs_pref_req_input atcs_input;
 584         struct atcs_pref_req_output atcs_output;
 585         struct acpi_buffer params;
 586         size_t size;
 587         u32 retry = 3;
 588
 589         /* Get the device handle */
 590         handle = ACPI_HANDLE(&adev->pdev->dev);
 591         if (!handle)
 592                 return -EINVAL;
 593
 594         if (!atcs->functions.pcie_perf_req)
 595                 return -EINVAL;
 596
 597         atcs_input.size = sizeof(struct atcs_pref_req_input);
 598         /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
 599         atcs_input.client_id = adev->pdev->devfn | (adev->pdev->bus->number << 8);
 600         atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
 601         atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
 602         if (advertise)
 603                 atcs_input.flags |= ATCS_ADVERTISE_CAPS;
 604         atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
 605         atcs_input.perf_req = perf_req;
 606
 607         params.length = sizeof(struct atcs_pref_req_input);
 608         params.pointer = &atcs_input;
 609
 610         while (retry--) {
 611                 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST, &params);
 612                 if (!info)
 613                         return -EIO;
 614
 615                 memset(&atcs_output, 0, sizeof(atcs_output));
 616
 617                 size = *(u16 *) info->buffer.pointer;
 618                 if (size < 3) {
 619                         DRM_INFO("ATCS buffer is too small: %zu\n", size);
 620                         kfree(info);
 621                         return -EINVAL;
 622                 }
 623                 size = min(sizeof(atcs_output), size);
 624
 625                 memcpy(&atcs_output, info->buffer.pointer, size);
 626
 627                 kfree(info);
 628
 629                 switch (atcs_output.ret_val) {
 630                 case ATCS_REQUEST_REFUSED:
 631                 default:
 632                         return -EINVAL;
 633                 case ATCS_REQUEST_COMPLETE:
 634                         return 0;
 635                 case ATCS_REQUEST_IN_PROGRESS:
 636                         udelay(10);
 637                         break;
 638                 }
 639         }
 640
 641         return 0;
 642 }
 643
 644 /**
 645  * amdgpu_acpi_event - handle notify events
 646  *
 647  * @nb: notifier block
 648  * @val: val
 649  * @data: acpi event
 650  *
 651  * Calls relevant amdgpu functions in response to various
 652  * acpi events.
 653  * Returns NOTIFY code
 654  */
 655 static int amdgpu_acpi_event(struct notifier_block *nb,
 656                              unsigned long val,
 657                              void *data)
 658 {
 659         struct amdgpu_device *adev = container_of(nb, struct amdgpu_device, acpi_nb);
 660         struct acpi_bus_event *entry = (struct acpi_bus_event *)data;
 661
 662         if (strcmp(entry->device_class, ACPI_AC_CLASS) == 0) {
 663                 if (power_supply_is_system_supplied() > 0)
 664                         DRM_DEBUG_DRIVER("pm: AC\n");
 665                 else
 666                         DRM_DEBUG_DRIVER("pm: DC\n");
 667
 668                 amdgpu_pm_acpi_event_handler(adev);
 669         }
 670
 671         /* Check for pending SBIOS requests */
 672         return amdgpu_atif_handler(adev, entry);
 673 }
 674
 675 /* Call all ACPI methods here */
 676 /**
 677  * amdgpu_acpi_init - init driver acpi support
 678  *
 679  * @adev: amdgpu_device pointer
 680  *
 681  * Verifies the AMD ACPI interfaces and registers with the acpi
 682  * notifier chain (all asics).
 683  * Returns 0 on success, error on failure.
 684  */
 685 int amdgpu_acpi_init(struct amdgpu_device *adev)
 686 {
 687         acpi_handle handle;
 688         struct amdgpu_atif *atif = &adev->atif;
 689         struct amdgpu_atcs *atcs = &adev->atcs;
 690         int ret;
 691
 692         /* Get the device handle */
 693         handle = ACPI_HANDLE(&adev->pdev->dev);
 694
 695         if (!adev->bios || !handle)
 696                 return 0;
 697
 698         /* Call the ATCS method */
 699         ret = amdgpu_atcs_verify_interface(handle, atcs);
 700         if (ret) {
 701                 DRM_DEBUG_DRIVER("Call to ATCS verify_interface failed: %d\n", ret);
 702         }
 703
 704         /* Call the ATIF method */
 705         ret = amdgpu_atif_verify_interface(handle, atif);
 706         if (ret) {
 707                 DRM_DEBUG_DRIVER("Call to ATIF verify_interface failed: %d\n", ret);
 708                 goto out;
 709         }
 710
 711         if (atif->notifications.brightness_change) {
 712                 struct drm_encoder *tmp;
 713
 714                 /* Find the encoder controlling the brightness */
 715                 list_for_each_entry(tmp, &adev->ddev->mode_config.encoder_list,
 716                                 head) {
 717                         struct amdgpu_encoder *enc = to_amdgpu_encoder(tmp);
 718
 719                         if ((enc->devices & (ATOM_DEVICE_LCD_SUPPORT)) &&
 720                             enc->enc_priv) {
 721                                 if (adev->is_atom_bios) {
 722                                         struct amdgpu_encoder_atom_dig *dig = enc->enc_priv;
 723                                         if (dig->bl_dev) {
 724                                                 atif->encoder_for_bl = enc;
 725                                                 break;
 726                                         }
 727                                 }
 728                         }
 729                 }
 730         }
 731
 732         if (atif->functions.sbios_requests && !atif->functions.system_params) {
 733                 /* XXX check this workraround, if sbios request function is
 734                  * present we have to see how it's configured in the system
 735                  * params
 736                  */
 737                 atif->functions.system_params = true;
 738         }
 739
 740         if (atif->functions.system_params) {
 741                 ret = amdgpu_atif_get_notification_params(handle,
 742                                 &atif->notification_cfg);
 743                 if (ret) {
 744                         DRM_DEBUG_DRIVER("Call to GET_SYSTEM_PARAMS failed: %d\n",
 745                                         ret);
 746                         /* Disable notification */
 747                         atif->notification_cfg.enabled = false;
 748                 }
 749         }
 750
 751 out:
 752         adev->acpi_nb.notifier_call = amdgpu_acpi_event;
 753         register_acpi_notifier(&adev->acpi_nb);
 754
 755         return ret;
 756 }
 757
 758 /**
 759  * amdgpu_acpi_fini - tear down driver acpi support
 760  *
 761  * @adev: amdgpu_device pointer
 762  *
 763  * Unregisters with the acpi notifier chain (all asics).
 764  */
 765 void amdgpu_acpi_fini(struct amdgpu_device *adev)
 766 {
 767         unregister_acpi_notifier(&adev->acpi_nb);
 768 }