drivers/gpu/drm/radeon/radeon_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 "radeon.h"
  33 #include "radeon_acpi.h"
  34 #include "atom.h"
  35
  36 #define ACPI_AC_CLASS           "ac_adapter"
  37
  38 extern void radeon_pm_acpi_event_handler(struct radeon_device *rdev);
  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  * radeon_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 *radeon_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  * radeon_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 radeon_atif_parse_notification(struct radeon_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  * radeon_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 radeon_atif_parse_functions(struct radeon_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  * radeon_atif_verify_interface - verify ATIF
 191  *
 192  * @handle: acpi handle
 193  * @atif: radeon 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 radeon_atif_verify_interface(acpi_handle handle,
 201                 struct radeon_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 = radeon_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         radeon_atif_parse_notification(&atif->notifications, output.notification_mask);
 228         radeon_atif_parse_functions(&atif->functions, output.function_bits);
 229
 230 out:
 231         kfree(info);
 232         return err;
 233 }
 234
 235 /**
 236  * radeon_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 radeon_atif_get_notification_params(acpi_handle handle,
 248                 struct radeon_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 = radeon_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  * radeon_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 radeon_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 = radeon_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  * radeon_atif_handler - handle ATIF notify requests
 340  *
 341  * @rdev: radeon_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 radeon_atif_handler(struct radeon_device *rdev,
 349                 struct acpi_bus_event *event)
 350 {
 351         struct radeon_atif *atif = &rdev->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(&rdev->pdev->dev);
 369         count = radeon_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 radeon_encoder *enc = atif->encoder_for_bl;
 378
 379                 if (enc) {
 380                         DRM_DEBUG_DRIVER("Changing brightness to %d\n",
 381                                         req.backlight_level);
 382
 383                         radeon_set_backlight_level(rdev, enc, req.backlight_level);
 384
 385 #if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
 386                         if (rdev->is_atom_bios) {
 387                                 struct radeon_encoder_atom_dig *dig = enc->enc_priv;
 388                                 backlight_force_update(dig->bl_dev,
 389                                                        BACKLIGHT_UPDATE_HOTKEY);
 390                         } else {
 391                                 struct radeon_encoder_lvds *dig = enc->enc_priv;
 392                                 backlight_force_update(dig->bl_dev,
 393                                                        BACKLIGHT_UPDATE_HOTKEY);
 394                         }
 395 #endif
 396                 }
 397         }
 398         /* TODO: check other events */
 399
 400         /* We've handled the event, stop the notifier chain. The ACPI interface
 401          * overloads ACPI_VIDEO_NOTIFY_PROBE, we don't want to send that to
 402          * userspace if the event was generated only to signal a SBIOS
 403          * request.
 404          */
 405         return NOTIFY_BAD;
 406 }
 407
 408 /* Call the ATCS method
 409  */
 410 /**
 411  * radeon_atcs_call - call an ATCS method
 412  *
 413  * @handle: acpi handle
 414  * @function: the ATCS function to execute
 415  * @params: ATCS function params
 416  *
 417  * Executes the requested ATCS function (all asics).
 418  * Returns a pointer to the acpi output buffer.
 419  */
 420 static union acpi_object *radeon_atcs_call(acpi_handle handle, int function,
 421                                            struct acpi_buffer *params)
 422 {
 423         acpi_status status;
 424         union acpi_object atcs_arg_elements[2];
 425         struct acpi_object_list atcs_arg;
 426         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 427
 428         atcs_arg.count = 2;
 429         atcs_arg.pointer = &atcs_arg_elements[0];
 430
 431         atcs_arg_elements[0].type = ACPI_TYPE_INTEGER;
 432         atcs_arg_elements[0].integer.value = function;
 433
 434         if (params) {
 435                 atcs_arg_elements[1].type = ACPI_TYPE_BUFFER;
 436                 atcs_arg_elements[1].buffer.length = params->length;
 437                 atcs_arg_elements[1].buffer.pointer = params->pointer;
 438         } else {
 439                 /* We need a second fake parameter */
 440                 atcs_arg_elements[1].type = ACPI_TYPE_INTEGER;
 441                 atcs_arg_elements[1].integer.value = 0;
 442         }
 443
 444         status = acpi_evaluate_object(handle, "ATCS", &atcs_arg, &buffer);
 445
 446         /* Fail only if calling the method fails and ATIF is supported */
 447         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 448                 DRM_DEBUG_DRIVER("failed to evaluate ATCS got %s\n",
 449                                  acpi_format_exception(status));
 450                 kfree(buffer.pointer);
 451                 return NULL;
 452         }
 453
 454         return buffer.pointer;
 455 }
 456
 457 /**
 458  * radeon_atcs_parse_functions - parse supported functions
 459  *
 460  * @f: supported functions struct
 461  * @mask: supported functions mask from ATCS
 462  *
 463  * Use the supported functions mask from ATCS function
 464  * ATCS_FUNCTION_VERIFY_INTERFACE to determine what functions
 465  * are supported (all asics).
 466  */
 467 static void radeon_atcs_parse_functions(struct radeon_atcs_functions *f, u32 mask)
 468 {
 469         f->get_ext_state = mask & ATCS_GET_EXTERNAL_STATE_SUPPORTED;
 470         f->pcie_perf_req = mask & ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED;
 471         f->pcie_dev_rdy = mask & ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED;
 472         f->pcie_bus_width = mask & ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED;
 473 }
 474
 475 /**
 476  * radeon_atcs_verify_interface - verify ATCS
 477  *
 478  * @handle: acpi handle
 479  * @atcs: radeon atcs struct
 480  *
 481  * Execute the ATCS_FUNCTION_VERIFY_INTERFACE ATCS function
 482  * to initialize ATCS and determine what features are supported
 483  * (all asics).
 484  * returns 0 on success, error on failure.
 485  */
 486 static int radeon_atcs_verify_interface(acpi_handle handle,
 487                                         struct radeon_atcs *atcs)
 488 {
 489         union acpi_object *info;
 490         struct atcs_verify_interface output;
 491         size_t size;
 492         int err = 0;
 493
 494         info = radeon_atcs_call(handle, ATCS_FUNCTION_VERIFY_INTERFACE, NULL);
 495         if (!info)
 496                 return -EIO;
 497
 498         memset(&output, 0, sizeof(output));
 499
 500         size = *(u16 *) info->buffer.pointer;
 501         if (size < 8) {
 502                 DRM_INFO("ATCS buffer is too small: %zu\n", size);
 503                 err = -EINVAL;
 504                 goto out;
 505         }
 506         size = min(sizeof(output), size);
 507
 508         memcpy(&output, info->buffer.pointer, size);
 509
 510         /* TODO: check version? */
 511         DRM_DEBUG_DRIVER("ATCS version %u\n", output.version);
 512
 513         radeon_atcs_parse_functions(&atcs->functions, output.function_bits);
 514
 515 out:
 516         kfree(info);
 517         return err;
 518 }
 519
 520 /**
 521  * radeon_acpi_is_pcie_performance_request_supported
 522  *
 523  * @rdev: radeon_device pointer
 524  *
 525  * Check if the ATCS pcie_perf_req and pcie_dev_rdy methods
 526  * are supported (all asics).
 527  * returns true if supported, false if not.
 528  */
 529 bool radeon_acpi_is_pcie_performance_request_supported(struct radeon_device *rdev)
 530 {
 531         struct radeon_atcs *atcs = &rdev->atcs;
 532
 533         if (atcs->functions.pcie_perf_req && atcs->functions.pcie_dev_rdy)
 534                 return true;
 535
 536         return false;
 537 }
 538
 539 /**
 540  * radeon_acpi_pcie_notify_device_ready
 541  *
 542  * @rdev: radeon_device pointer
 543  *
 544  * Executes the PCIE_DEVICE_READY_NOTIFICATION method
 545  * (all asics).
 546  * returns 0 on success, error on failure.
 547  */
 548 int radeon_acpi_pcie_notify_device_ready(struct radeon_device *rdev)
 549 {
 550         acpi_handle handle;
 551         union acpi_object *info;
 552         struct radeon_atcs *atcs = &rdev->atcs;
 553
 554         /* Get the device handle */
 555         handle = ACPI_HANDLE(&rdev->pdev->dev);
 556         if (!handle)
 557                 return -EINVAL;
 558
 559         if (!atcs->functions.pcie_dev_rdy)
 560                 return -EINVAL;
 561
 562         info = radeon_atcs_call(handle, ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION, NULL);
 563         if (!info)
 564                 return -EIO;
 565
 566         kfree(info);
 567
 568         return 0;
 569 }
 570
 571 /**
 572  * radeon_acpi_pcie_performance_request
 573  *
 574  * @rdev: radeon_device pointer
 575  * @perf_req: requested perf level (pcie gen speed)
 576  * @advertise: set advertise caps flag if set
 577  *
 578  * Executes the PCIE_PERFORMANCE_REQUEST method to
 579  * change the pcie gen speed (all asics).
 580  * returns 0 on success, error on failure.
 581  */
 582 int radeon_acpi_pcie_performance_request(struct radeon_device *rdev,
 583                                          u8 perf_req, bool advertise)
 584 {
 585         acpi_handle handle;
 586         union acpi_object *info;
 587         struct radeon_atcs *atcs = &rdev->atcs;
 588         struct atcs_pref_req_input atcs_input;
 589         struct atcs_pref_req_output atcs_output;
 590         struct acpi_buffer params;
 591         size_t size;
 592         u32 retry = 3;
 593
 594         /* Get the device handle */
 595         handle = ACPI_HANDLE(&rdev->pdev->dev);
 596         if (!handle)
 597                 return -EINVAL;
 598
 599         if (!atcs->functions.pcie_perf_req)
 600                 return -EINVAL;
 601
 602         atcs_input.size = sizeof(struct atcs_pref_req_input);
 603         /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
 604         atcs_input.client_id = rdev->pdev->devfn | (rdev->pdev->bus->number << 8);
 605         atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
 606         atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
 607         if (advertise)
 608                 atcs_input.flags |= ATCS_ADVERTISE_CAPS;
 609         atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
 610         atcs_input.perf_req = perf_req;
 611
 612         params.length = sizeof(struct atcs_pref_req_input);
 613         params.pointer = &atcs_input;
 614
 615         while (retry--) {
 616                 info = radeon_atcs_call(handle, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST, &params);
 617                 if (!info)
 618                         return -EIO;
 619
 620                 memset(&atcs_output, 0, sizeof(atcs_output));
 621
 622                 size = *(u16 *) info->buffer.pointer;
 623                 if (size < 3) {
 624                         DRM_INFO("ATCS buffer is too small: %zu\n", size);
 625                         kfree(info);
 626                         return -EINVAL;
 627                 }
 628                 size = min(sizeof(atcs_output), size);
 629
 630                 memcpy(&atcs_output, info->buffer.pointer, size);
 631
 632                 kfree(info);
 633
 634                 switch (atcs_output.ret_val) {
 635                 case ATCS_REQUEST_REFUSED:
 636                 default:
 637                         return -EINVAL;
 638                 case ATCS_REQUEST_COMPLETE:
 639                         return 0;
 640                 case ATCS_REQUEST_IN_PROGRESS:
 641                         udelay(10);
 642                         break;
 643                 }
 644         }
 645
 646         return 0;
 647 }
 648
 649 /**
 650  * radeon_acpi_event - handle notify events
 651  *
 652  * @nb: notifier block
 653  * @val: val
 654  * @data: acpi event
 655  *
 656  * Calls relevant radeon functions in response to various
 657  * acpi events.
 658  * Returns NOTIFY code
 659  */
 660 static int radeon_acpi_event(struct notifier_block *nb,
 661                              unsigned long val,
 662                              void *data)
 663 {
 664         struct radeon_device *rdev = container_of(nb, struct radeon_device, acpi_nb);
 665         struct acpi_bus_event *entry = (struct acpi_bus_event *)data;
 666
 667         if (strcmp(entry->device_class, ACPI_AC_CLASS) == 0) {
 668                 if (power_supply_is_system_supplied() > 0)
 669                         DRM_DEBUG_DRIVER("pm: AC\n");
 670                 else
 671                         DRM_DEBUG_DRIVER("pm: DC\n");
 672
 673                 radeon_pm_acpi_event_handler(rdev);
 674         }
 675
 676         /* Check for pending SBIOS requests */
 677         return radeon_atif_handler(rdev, entry);
 678 }
 679
 680 /* Call all ACPI methods here */
 681 /**
 682  * radeon_acpi_init - init driver acpi support
 683  *
 684  * @rdev: radeon_device pointer
 685  *
 686  * Verifies the AMD ACPI interfaces and registers with the acpi
 687  * notifier chain (all asics).
 688  * Returns 0 on success, error on failure.
 689  */
 690 int radeon_acpi_init(struct radeon_device *rdev)
 691 {
 692         acpi_handle handle;
 693         struct radeon_atif *atif = &rdev->atif;
 694         struct radeon_atcs *atcs = &rdev->atcs;
 695         int ret;
 696
 697         /* Get the device handle */
 698         handle = ACPI_HANDLE(&rdev->pdev->dev);
 699
 700         /* No need to proceed if we're sure that ATIF is not supported */
 701         if (!ASIC_IS_AVIVO(rdev) || !rdev->bios || !handle)
 702                 return 0;
 703
 704         /* Call the ATCS method */
 705         ret = radeon_atcs_verify_interface(handle, atcs);
 706         if (ret) {
 707                 DRM_DEBUG_DRIVER("Call to ATCS verify_interface failed: %d\n", ret);
 708         }
 709
 710         /* Call the ATIF method */
 711         ret = radeon_atif_verify_interface(handle, atif);
 712         if (ret) {
 713                 DRM_DEBUG_DRIVER("Call to ATIF verify_interface failed: %d\n", ret);
 714                 goto out;
 715         }
 716
 717         if (atif->notifications.brightness_change) {
 718                 struct drm_encoder *tmp;
 719                 struct radeon_encoder *target = NULL;
 720
 721                 /* Find the encoder controlling the brightness */
 722                 list_for_each_entry(tmp, &rdev->ddev->mode_config.encoder_list,
 723                                 head) {
 724                         struct radeon_encoder *enc = to_radeon_encoder(tmp);
 725
 726                         if ((enc->devices & (ATOM_DEVICE_LCD_SUPPORT)) &&
 727                             enc->enc_priv) {
 728                                 if (rdev->is_atom_bios) {
 729                                         struct radeon_encoder_atom_dig *dig = enc->enc_priv;
 730                                         if (dig->bl_dev) {
 731                                                 target = enc;
 732                                                 break;
 733                                         }
 734                                 } else {
 735                                         struct radeon_encoder_lvds *dig = enc->enc_priv;
 736                                         if (dig->bl_dev) {
 737                                                 target = enc;
 738                                                 break;
 739                                         }
 740                                 }
 741                         }
 742                 }
 743
 744                 atif->encoder_for_bl = target;
 745                 if (!target) {
 746                         /* Brightness change notification is enabled, but we
 747                          * didn't find a backlight controller, this should
 748                          * never happen.
 749                          */
 750                         DRM_ERROR("Cannot find a backlight controller\n");
 751                 }
 752         }
 753
 754         if (atif->functions.sbios_requests && !atif->functions.system_params) {
 755                 /* XXX check this workraround, if sbios request function is
 756                  * present we have to see how it's configured in the system
 757                  * params
 758                  */
 759                 atif->functions.system_params = true;
 760         }
 761
 762         if (atif->functions.system_params) {
 763                 ret = radeon_atif_get_notification_params(handle,
 764                                 &atif->notification_cfg);
 765                 if (ret) {
 766                         DRM_DEBUG_DRIVER("Call to GET_SYSTEM_PARAMS failed: %d\n",
 767                                         ret);
 768                         /* Disable notification */
 769                         atif->notification_cfg.enabled = false;
 770                 }
 771         }
 772
 773 out:
 774         rdev->acpi_nb.notifier_call = radeon_acpi_event;
 775         register_acpi_notifier(&rdev->acpi_nb);
 776
 777         return ret;
 778 }
 779
 780 /**
 781  * radeon_acpi_fini - tear down driver acpi support
 782  *
 783  * @rdev: radeon_device pointer
 784  *
 785  * Unregisters with the acpi notifier chain (all asics).
 786  */
 787 void radeon_acpi_fini(struct radeon_device *rdev)
 788 {
 789         unregister_acpi_notifier(&rdev->acpi_nb);
 790 }