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/pm_runtime.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 #if defined(CONFIG_VGA_SWITCHEROO)
  37 bool radeon_atpx_dgpu_req_power_for_displays(void);
  38 #else
  39 static inline bool radeon_atpx_dgpu_req_power_for_displays(void) { return false; }
  40 #endif
  41
  42 #define ACPI_AC_CLASS           "ac_adapter"
  43
  44 extern void radeon_pm_acpi_event_handler(struct radeon_device *rdev);
  45
  46 struct atif_verify_interface {
  47         u16 size;               /* structure size in bytes (includes size field) */
  48         u16 version;            /* version */
  49         u32 notification_mask;  /* supported notifications mask */
  50         u32 function_bits;      /* supported functions bit vector */
  51 } __packed;
  52
  53 struct atif_system_params {
  54         u16 size;               /* structure size in bytes (includes size field) */
  55         u32 valid_mask;         /* valid flags mask */
  56         u32 flags;              /* flags */
  57         u8 command_code;        /* notify command code */
  58 } __packed;
  59
  60 struct atif_sbios_requests {
  61         u16 size;               /* structure size in bytes (includes size field) */
  62         u32 pending;            /* pending sbios requests */
  63         u8 panel_exp_mode;      /* panel expansion mode */
  64         u8 thermal_gfx;         /* thermal state: target gfx controller */
  65         u8 thermal_state;       /* thermal state: state id (0: exit state, non-0: state) */
  66         u8 forced_power_gfx;    /* forced power state: target gfx controller */
  67         u8 forced_power_state;  /* forced power state: state id */
  68         u8 system_power_src;    /* system power source */
  69         u8 backlight_level;     /* panel backlight level (0-255) */
  70 } __packed;
  71
  72 #define ATIF_NOTIFY_MASK        0x3
  73 #define ATIF_NOTIFY_NONE        0
  74 #define ATIF_NOTIFY_81          1
  75 #define ATIF_NOTIFY_N           2
  76
  77 struct atcs_verify_interface {
  78         u16 size;               /* structure size in bytes (includes size field) */
  79         u16 version;            /* version */
  80         u32 function_bits;      /* supported functions bit vector */
  81 } __packed;
  82
  83 #define ATCS_VALID_FLAGS_MASK   0x3
  84
  85 struct atcs_pref_req_input {
  86         u16 size;               /* structure size in bytes (includes size field) */
  87         u16 client_id;          /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
  88         u16 valid_flags_mask;   /* valid flags mask */
  89         u16 flags;              /* flags */
  90         u8 req_type;            /* request type */
  91         u8 perf_req;            /* performance request */
  92 } __packed;
  93
  94 struct atcs_pref_req_output {
  95         u16 size;               /* structure size in bytes (includes size field) */
  96         u8 ret_val;             /* return value */
  97 } __packed;
  98
  99 /* Call the ATIF method
 100  */
 101 /**
 102  * radeon_atif_call - call an ATIF method
 103  *
 104  * @handle: acpi handle
 105  * @function: the ATIF function to execute
 106  * @params: ATIF function params
 107  *
 108  * Executes the requested ATIF function (all asics).
 109  * Returns a pointer to the acpi output buffer.
 110  */
 111 static union acpi_object *radeon_atif_call(acpi_handle handle, int function,
 112                 struct acpi_buffer *params)
 113 {
 114         acpi_status status;
 115         union acpi_object atif_arg_elements[2];
 116         struct acpi_object_list atif_arg;
 117         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 118
 119         atif_arg.count = 2;
 120         atif_arg.pointer = &atif_arg_elements[0];
 121
 122         atif_arg_elements[0].type = ACPI_TYPE_INTEGER;
 123         atif_arg_elements[0].integer.value = function;
 124
 125         if (params) {
 126                 atif_arg_elements[1].type = ACPI_TYPE_BUFFER;
 127                 atif_arg_elements[1].buffer.length = params->length;
 128                 atif_arg_elements[1].buffer.pointer = params->pointer;
 129         } else {
 130                 /* We need a second fake parameter */
 131                 atif_arg_elements[1].type = ACPI_TYPE_INTEGER;
 132                 atif_arg_elements[1].integer.value = 0;
 133         }
 134
 135         status = acpi_evaluate_object(handle, "ATIF", &atif_arg, &buffer);
 136
 137         /* Fail only if calling the method fails and ATIF is supported */
 138         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 139                 DRM_DEBUG_DRIVER("failed to evaluate ATIF got %s\n",
 140                                  acpi_format_exception(status));
 141                 kfree(buffer.pointer);
 142                 return NULL;
 143         }
 144
 145         return buffer.pointer;
 146 }
 147
 148 /**
 149  * radeon_atif_parse_notification - parse supported notifications
 150  *
 151  * @n: supported notifications struct
 152  * @mask: supported notifications mask from ATIF
 153  *
 154  * Use the supported notifications mask from ATIF function
 155  * ATIF_FUNCTION_VERIFY_INTERFACE to determine what notifications
 156  * are supported (all asics).
 157  */
 158 static void radeon_atif_parse_notification(struct radeon_atif_notifications *n, u32 mask)
 159 {
 160         n->display_switch = mask & ATIF_DISPLAY_SWITCH_REQUEST_SUPPORTED;
 161         n->expansion_mode_change = mask & ATIF_EXPANSION_MODE_CHANGE_REQUEST_SUPPORTED;
 162         n->thermal_state = mask & ATIF_THERMAL_STATE_CHANGE_REQUEST_SUPPORTED;
 163         n->forced_power_state = mask & ATIF_FORCED_POWER_STATE_CHANGE_REQUEST_SUPPORTED;
 164         n->system_power_state = mask & ATIF_SYSTEM_POWER_SOURCE_CHANGE_REQUEST_SUPPORTED;
 165         n->display_conf_change = mask & ATIF_DISPLAY_CONF_CHANGE_REQUEST_SUPPORTED;
 166         n->px_gfx_switch = mask & ATIF_PX_GFX_SWITCH_REQUEST_SUPPORTED;
 167         n->brightness_change = mask & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST_SUPPORTED;
 168         n->dgpu_display_event = mask & ATIF_DGPU_DISPLAY_EVENT_SUPPORTED;
 169 }
 170
 171 /**
 172  * radeon_atif_parse_functions - parse supported functions
 173  *
 174  * @f: supported functions struct
 175  * @mask: supported functions mask from ATIF
 176  *
 177  * Use the supported functions mask from ATIF function
 178  * ATIF_FUNCTION_VERIFY_INTERFACE to determine what functions
 179  * are supported (all asics).
 180  */
 181 static void radeon_atif_parse_functions(struct radeon_atif_functions *f, u32 mask)
 182 {
 183         f->system_params = mask & ATIF_GET_SYSTEM_PARAMETERS_SUPPORTED;
 184         f->sbios_requests = mask & ATIF_GET_SYSTEM_BIOS_REQUESTS_SUPPORTED;
 185         f->select_active_disp = mask & ATIF_SELECT_ACTIVE_DISPLAYS_SUPPORTED;
 186         f->lid_state = mask & ATIF_GET_LID_STATE_SUPPORTED;
 187         f->get_tv_standard = mask & ATIF_GET_TV_STANDARD_FROM_CMOS_SUPPORTED;
 188         f->set_tv_standard = mask & ATIF_SET_TV_STANDARD_IN_CMOS_SUPPORTED;
 189         f->get_panel_expansion_mode = mask & ATIF_GET_PANEL_EXPANSION_MODE_FROM_CMOS_SUPPORTED;
 190         f->set_panel_expansion_mode = mask & ATIF_SET_PANEL_EXPANSION_MODE_IN_CMOS_SUPPORTED;
 191         f->temperature_change = mask & ATIF_TEMPERATURE_CHANGE_NOTIFICATION_SUPPORTED;
 192         f->graphics_device_types = mask & ATIF_GET_GRAPHICS_DEVICE_TYPES_SUPPORTED;
 193 }
 194
 195 /**
 196  * radeon_atif_verify_interface - verify ATIF
 197  *
 198  * @handle: acpi handle
 199  * @atif: radeon atif struct
 200  *
 201  * Execute the ATIF_FUNCTION_VERIFY_INTERFACE ATIF function
 202  * to initialize ATIF and determine what features are supported
 203  * (all asics).
 204  * returns 0 on success, error on failure.
 205  */
 206 static int radeon_atif_verify_interface(acpi_handle handle,
 207                 struct radeon_atif *atif)
 208 {
 209         union acpi_object *info;
 210         struct atif_verify_interface output;
 211         size_t size;
 212         int err = 0;
 213
 214         info = radeon_atif_call(handle, ATIF_FUNCTION_VERIFY_INTERFACE, NULL);
 215         if (!info)
 216                 return -EIO;
 217
 218         memset(&output, 0, sizeof(output));
 219
 220         size = *(u16 *) info->buffer.pointer;
 221         if (size < 12) {
 222                 DRM_INFO("ATIF buffer is too small: %zu\n", size);
 223                 err = -EINVAL;
 224                 goto out;
 225         }
 226         size = min(sizeof(output), size);
 227
 228         memcpy(&output, info->buffer.pointer, size);
 229
 230         /* TODO: check version? */
 231         DRM_DEBUG_DRIVER("ATIF version %u\n", output.version);
 232
 233         radeon_atif_parse_notification(&atif->notifications, output.notification_mask);
 234         radeon_atif_parse_functions(&atif->functions, output.function_bits);
 235
 236 out:
 237         kfree(info);
 238         return err;
 239 }
 240
 241 /**
 242  * radeon_atif_get_notification_params - determine notify configuration
 243  *
 244  * @handle: acpi handle
 245  * @n: atif notification configuration struct
 246  *
 247  * Execute the ATIF_FUNCTION_GET_SYSTEM_PARAMETERS ATIF function
 248  * to determine if a notifier is used and if so which one
 249  * (all asics).  This is either Notify(VGA, 0x81) or Notify(VGA, n)
 250  * where n is specified in the result if a notifier is used.
 251  * Returns 0 on success, error on failure.
 252  */
 253 static int radeon_atif_get_notification_params(acpi_handle handle,
 254                 struct radeon_atif_notification_cfg *n)
 255 {
 256         union acpi_object *info;
 257         struct atif_system_params params;
 258         size_t size;
 259         int err = 0;
 260
 261         info = radeon_atif_call(handle, ATIF_FUNCTION_GET_SYSTEM_PARAMETERS, NULL);
 262         if (!info) {
 263                 err = -EIO;
 264                 goto out;
 265         }
 266
 267         size = *(u16 *) info->buffer.pointer;
 268         if (size < 10) {
 269                 err = -EINVAL;
 270                 goto out;
 271         }
 272
 273         memset(&params, 0, sizeof(params));
 274         size = min(sizeof(params), size);
 275         memcpy(&params, info->buffer.pointer, size);
 276
 277         DRM_DEBUG_DRIVER("SYSTEM_PARAMS: mask = %#x, flags = %#x\n",
 278                         params.flags, params.valid_mask);
 279         params.flags = params.flags & params.valid_mask;
 280
 281         if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_NONE) {
 282                 n->enabled = false;
 283                 n->command_code = 0;
 284         } else if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_81) {
 285                 n->enabled = true;
 286                 n->command_code = 0x81;
 287         } else {
 288                 if (size < 11) {
 289                         err = -EINVAL;
 290                         goto out;
 291                 }
 292                 n->enabled = true;
 293                 n->command_code = params.command_code;
 294         }
 295
 296 out:
 297         DRM_DEBUG_DRIVER("Notification %s, command code = %#x\n",
 298                         (n->enabled ? "enabled" : "disabled"),
 299                         n->command_code);
 300         kfree(info);
 301         return err;
 302 }
 303
 304 /**
 305  * radeon_atif_get_sbios_requests - get requested sbios event
 306  *
 307  * @handle: acpi handle
 308  * @req: atif sbios request struct
 309  *
 310  * Execute the ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS ATIF function
 311  * to determine what requests the sbios is making to the driver
 312  * (all asics).
 313  * Returns 0 on success, error on failure.
 314  */
 315 static int radeon_atif_get_sbios_requests(acpi_handle handle,
 316                 struct atif_sbios_requests *req)
 317 {
 318         union acpi_object *info;
 319         size_t size;
 320         int count = 0;
 321
 322         info = radeon_atif_call(handle, ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS, NULL);
 323         if (!info)
 324                 return -EIO;
 325
 326         size = *(u16 *)info->buffer.pointer;
 327         if (size < 0xd) {
 328                 count = -EINVAL;
 329                 goto out;
 330         }
 331         memset(req, 0, sizeof(*req));
 332
 333         size = min(sizeof(*req), size);
 334         memcpy(req, info->buffer.pointer, size);
 335         DRM_DEBUG_DRIVER("SBIOS pending requests: %#x\n", req->pending);
 336
 337         count = hweight32(req->pending);
 338
 339 out:
 340         kfree(info);
 341         return count;
 342 }
 343
 344 /**
 345  * radeon_atif_handler - handle ATIF notify requests
 346  *
 347  * @rdev: radeon_device pointer
 348  * @event: atif sbios request struct
 349  *
 350  * Checks the acpi event and if it matches an atif event,
 351  * handles it.
 352  * Returns NOTIFY code
 353  */
 354 static int radeon_atif_handler(struct radeon_device *rdev,
 355                 struct acpi_bus_event *event)
 356 {
 357         struct radeon_atif *atif = &rdev->atif;
 358         struct atif_sbios_requests req;
 359         acpi_handle handle;
 360         int count;
 361
 362         DRM_DEBUG_DRIVER("event, device_class = %s, type = %#x\n",
 363                         event->device_class, event->type);
 364
 365         if (strcmp(event->device_class, ACPI_VIDEO_CLASS) != 0)
 366                 return NOTIFY_DONE;
 367
 368         if (!atif->notification_cfg.enabled ||
 369                         event->type != atif->notification_cfg.command_code)
 370                 /* Not our event */
 371                 return NOTIFY_DONE;
 372
 373         /* Check pending SBIOS requests */
 374         handle = ACPI_HANDLE(&rdev->pdev->dev);
 375         count = radeon_atif_get_sbios_requests(handle, &req);
 376
 377         if (count <= 0)
 378                 return NOTIFY_DONE;
 379
 380         DRM_DEBUG_DRIVER("ATIF: %d pending SBIOS requests\n", count);
 381
 382         if (req.pending & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST) {
 383                 struct radeon_encoder *enc = atif->encoder_for_bl;
 384
 385                 if (enc) {
 386                         DRM_DEBUG_DRIVER("Changing brightness to %d\n",
 387                                         req.backlight_level);
 388
 389                         radeon_set_backlight_level(rdev, enc, req.backlight_level);
 390
 391 #if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
 392                         if (rdev->is_atom_bios) {
 393                                 struct radeon_encoder_atom_dig *dig = enc->enc_priv;
 394                                 backlight_force_update(dig->bl_dev,
 395                                                        BACKLIGHT_UPDATE_HOTKEY);
 396                         } else {
 397                                 struct radeon_encoder_lvds *dig = enc->enc_priv;
 398                                 backlight_force_update(dig->bl_dev,
 399                                                        BACKLIGHT_UPDATE_HOTKEY);
 400                         }
 401 #endif
 402                 }
 403         }
 404         if (req.pending & ATIF_DGPU_DISPLAY_EVENT) {
 405                 if ((rdev->flags & RADEON_IS_PX) &&
 406                     radeon_atpx_dgpu_req_power_for_displays()) {
 407                         pm_runtime_get_sync(rdev->ddev->dev);
 408                         /* Just fire off a uevent and let userspace tell us what to do */
 409                         drm_helper_hpd_irq_event(rdev->ddev);
 410                         pm_runtime_mark_last_busy(rdev->ddev->dev);
 411                         pm_runtime_put_autosuspend(rdev->ddev->dev);
 412                 }
 413         }
 414         /* TODO: check other events */
 415
 416         /* We've handled the event, stop the notifier chain. The ACPI interface
 417          * overloads ACPI_VIDEO_NOTIFY_PROBE, we don't want to send that to
 418          * userspace if the event was generated only to signal a SBIOS
 419          * request.
 420          */
 421         return NOTIFY_BAD;
 422 }
 423
 424 /* Call the ATCS method
 425  */
 426 /**
 427  * radeon_atcs_call - call an ATCS method
 428  *
 429  * @handle: acpi handle
 430  * @function: the ATCS function to execute
 431  * @params: ATCS function params
 432  *
 433  * Executes the requested ATCS function (all asics).
 434  * Returns a pointer to the acpi output buffer.
 435  */
 436 static union acpi_object *radeon_atcs_call(acpi_handle handle, int function,
 437                                            struct acpi_buffer *params)
 438 {
 439         acpi_status status;
 440         union acpi_object atcs_arg_elements[2];
 441         struct acpi_object_list atcs_arg;
 442         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 443
 444         atcs_arg.count = 2;
 445         atcs_arg.pointer = &atcs_arg_elements[0];
 446
 447         atcs_arg_elements[0].type = ACPI_TYPE_INTEGER;
 448         atcs_arg_elements[0].integer.value = function;
 449
 450         if (params) {
 451                 atcs_arg_elements[1].type = ACPI_TYPE_BUFFER;
 452                 atcs_arg_elements[1].buffer.length = params->length;
 453                 atcs_arg_elements[1].buffer.pointer = params->pointer;
 454         } else {
 455                 /* We need a second fake parameter */
 456                 atcs_arg_elements[1].type = ACPI_TYPE_INTEGER;
 457                 atcs_arg_elements[1].integer.value = 0;
 458         }
 459
 460         status = acpi_evaluate_object(handle, "ATCS", &atcs_arg, &buffer);
 461
 462         /* Fail only if calling the method fails and ATIF is supported */
 463         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 464                 DRM_DEBUG_DRIVER("failed to evaluate ATCS got %s\n",
 465                                  acpi_format_exception(status));
 466                 kfree(buffer.pointer);
 467                 return NULL;
 468         }
 469
 470         return buffer.pointer;
 471 }
 472
 473 /**
 474  * radeon_atcs_parse_functions - parse supported functions
 475  *
 476  * @f: supported functions struct
 477  * @mask: supported functions mask from ATCS
 478  *
 479  * Use the supported functions mask from ATCS function
 480  * ATCS_FUNCTION_VERIFY_INTERFACE to determine what functions
 481  * are supported (all asics).
 482  */
 483 static void radeon_atcs_parse_functions(struct radeon_atcs_functions *f, u32 mask)
 484 {
 485         f->get_ext_state = mask & ATCS_GET_EXTERNAL_STATE_SUPPORTED;
 486         f->pcie_perf_req = mask & ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED;
 487         f->pcie_dev_rdy = mask & ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED;
 488         f->pcie_bus_width = mask & ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED;
 489 }
 490
 491 /**
 492  * radeon_atcs_verify_interface - verify ATCS
 493  *
 494  * @handle: acpi handle
 495  * @atcs: radeon atcs struct
 496  *
 497  * Execute the ATCS_FUNCTION_VERIFY_INTERFACE ATCS function
 498  * to initialize ATCS and determine what features are supported
 499  * (all asics).
 500  * returns 0 on success, error on failure.
 501  */
 502 static int radeon_atcs_verify_interface(acpi_handle handle,
 503                                         struct radeon_atcs *atcs)
 504 {
 505         union acpi_object *info;
 506         struct atcs_verify_interface output;
 507         size_t size;
 508         int err = 0;
 509
 510         info = radeon_atcs_call(handle, ATCS_FUNCTION_VERIFY_INTERFACE, NULL);
 511         if (!info)
 512                 return -EIO;
 513
 514         memset(&output, 0, sizeof(output));
 515
 516         size = *(u16 *) info->buffer.pointer;
 517         if (size < 8) {
 518                 DRM_INFO("ATCS buffer is too small: %zu\n", size);
 519                 err = -EINVAL;
 520                 goto out;
 521         }
 522         size = min(sizeof(output), size);
 523
 524         memcpy(&output, info->buffer.pointer, size);
 525
 526         /* TODO: check version? */
 527         DRM_DEBUG_DRIVER("ATCS version %u\n", output.version);
 528
 529         radeon_atcs_parse_functions(&atcs->functions, output.function_bits);
 530
 531 out:
 532         kfree(info);
 533         return err;
 534 }
 535
 536 /**
 537  * radeon_acpi_is_pcie_performance_request_supported
 538  *
 539  * @rdev: radeon_device pointer
 540  *
 541  * Check if the ATCS pcie_perf_req and pcie_dev_rdy methods
 542  * are supported (all asics).
 543  * returns true if supported, false if not.
 544  */
 545 bool radeon_acpi_is_pcie_performance_request_supported(struct radeon_device *rdev)
 546 {
 547         struct radeon_atcs *atcs = &rdev->atcs;
 548
 549         if (atcs->functions.pcie_perf_req && atcs->functions.pcie_dev_rdy)
 550                 return true;
 551
 552         return false;
 553 }
 554
 555 /**
 556  * radeon_acpi_pcie_notify_device_ready
 557  *
 558  * @rdev: radeon_device pointer
 559  *
 560  * Executes the PCIE_DEVICE_READY_NOTIFICATION method
 561  * (all asics).
 562  * returns 0 on success, error on failure.
 563  */
 564 int radeon_acpi_pcie_notify_device_ready(struct radeon_device *rdev)
 565 {
 566         acpi_handle handle;
 567         union acpi_object *info;
 568         struct radeon_atcs *atcs = &rdev->atcs;
 569
 570         /* Get the device handle */
 571         handle = ACPI_HANDLE(&rdev->pdev->dev);
 572         if (!handle)
 573                 return -EINVAL;
 574
 575         if (!atcs->functions.pcie_dev_rdy)
 576                 return -EINVAL;
 577
 578         info = radeon_atcs_call(handle, ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION, NULL);
 579         if (!info)
 580                 return -EIO;
 581
 582         kfree(info);
 583
 584         return 0;
 585 }
 586
 587 /**
 588  * radeon_acpi_pcie_performance_request
 589  *
 590  * @rdev: radeon_device pointer
 591  * @perf_req: requested perf level (pcie gen speed)
 592  * @advertise: set advertise caps flag if set
 593  *
 594  * Executes the PCIE_PERFORMANCE_REQUEST method to
 595  * change the pcie gen speed (all asics).
 596  * returns 0 on success, error on failure.
 597  */
 598 int radeon_acpi_pcie_performance_request(struct radeon_device *rdev,
 599                                          u8 perf_req, bool advertise)
 600 {
 601         acpi_handle handle;
 602         union acpi_object *info;
 603         struct radeon_atcs *atcs = &rdev->atcs;
 604         struct atcs_pref_req_input atcs_input;
 605         struct atcs_pref_req_output atcs_output;
 606         struct acpi_buffer params;
 607         size_t size;
 608         u32 retry = 3;
 609
 610         /* Get the device handle */
 611         handle = ACPI_HANDLE(&rdev->pdev->dev);
 612         if (!handle)
 613                 return -EINVAL;
 614
 615         if (!atcs->functions.pcie_perf_req)
 616                 return -EINVAL;
 617
 618         atcs_input.size = sizeof(struct atcs_pref_req_input);
 619         /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
 620         atcs_input.client_id = rdev->pdev->devfn | (rdev->pdev->bus->number << 8);
 621         atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
 622         atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
 623         if (advertise)
 624                 atcs_input.flags |= ATCS_ADVERTISE_CAPS;
 625         atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
 626         atcs_input.perf_req = perf_req;
 627
 628         params.length = sizeof(struct atcs_pref_req_input);
 629         params.pointer = &atcs_input;
 630
 631         while (retry--) {
 632                 info = radeon_atcs_call(handle, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST, &params);
 633                 if (!info)
 634                         return -EIO;
 635
 636                 memset(&atcs_output, 0, sizeof(atcs_output));
 637
 638                 size = *(u16 *) info->buffer.pointer;
 639                 if (size < 3) {
 640                         DRM_INFO("ATCS buffer is too small: %zu\n", size);
 641                         kfree(info);
 642                         return -EINVAL;
 643                 }
 644                 size = min(sizeof(atcs_output), size);
 645
 646                 memcpy(&atcs_output, info->buffer.pointer, size);
 647
 648                 kfree(info);
 649
 650                 switch (atcs_output.ret_val) {
 651                 case ATCS_REQUEST_REFUSED:
 652                 default:
 653                         return -EINVAL;
 654                 case ATCS_REQUEST_COMPLETE:
 655                         return 0;
 656                 case ATCS_REQUEST_IN_PROGRESS:
 657                         udelay(10);
 658                         break;
 659                 }
 660         }
 661
 662         return 0;
 663 }
 664
 665 /**
 666  * radeon_acpi_event - handle notify events
 667  *
 668  * @nb: notifier block
 669  * @val: val
 670  * @data: acpi event
 671  *
 672  * Calls relevant radeon functions in response to various
 673  * acpi events.
 674  * Returns NOTIFY code
 675  */
 676 static int radeon_acpi_event(struct notifier_block *nb,
 677                              unsigned long val,
 678                              void *data)
 679 {
 680         struct radeon_device *rdev = container_of(nb, struct radeon_device, acpi_nb);
 681         struct acpi_bus_event *entry = (struct acpi_bus_event *)data;
 682
 683         if (strcmp(entry->device_class, ACPI_AC_CLASS) == 0) {
 684                 if (power_supply_is_system_supplied() > 0)
 685                         DRM_DEBUG_DRIVER("pm: AC\n");
 686                 else
 687                         DRM_DEBUG_DRIVER("pm: DC\n");
 688
 689                 radeon_pm_acpi_event_handler(rdev);
 690         }
 691
 692         /* Check for pending SBIOS requests */
 693         return radeon_atif_handler(rdev, entry);
 694 }
 695
 696 /* Call all ACPI methods here */
 697 /**
 698  * radeon_acpi_init - init driver acpi support
 699  *
 700  * @rdev: radeon_device pointer
 701  *
 702  * Verifies the AMD ACPI interfaces and registers with the acpi
 703  * notifier chain (all asics).
 704  * Returns 0 on success, error on failure.
 705  */
 706 int radeon_acpi_init(struct radeon_device *rdev)
 707 {
 708         acpi_handle handle;
 709         struct radeon_atif *atif = &rdev->atif;
 710         struct radeon_atcs *atcs = &rdev->atcs;
 711         int ret;
 712
 713         /* Get the device handle */
 714         handle = ACPI_HANDLE(&rdev->pdev->dev);
 715
 716         /* No need to proceed if we're sure that ATIF is not supported */
 717         if (!ASIC_IS_AVIVO(rdev) || !rdev->bios || !handle)
 718                 return 0;
 719
 720         /* Call the ATCS method */
 721         ret = radeon_atcs_verify_interface(handle, atcs);
 722         if (ret) {
 723                 DRM_DEBUG_DRIVER("Call to ATCS verify_interface failed: %d\n", ret);
 724         }
 725
 726         /* Call the ATIF method */
 727         ret = radeon_atif_verify_interface(handle, atif);
 728         if (ret) {
 729                 DRM_DEBUG_DRIVER("Call to ATIF verify_interface failed: %d\n", ret);
 730                 goto out;
 731         }
 732
 733         if (atif->notifications.brightness_change) {
 734                 struct drm_encoder *tmp;
 735                 struct radeon_encoder *target = NULL;
 736
 737                 /* Find the encoder controlling the brightness */
 738                 list_for_each_entry(tmp, &rdev->ddev->mode_config.encoder_list,
 739                                 head) {
 740                         struct radeon_encoder *enc = to_radeon_encoder(tmp);
 741
 742                         if ((enc->devices & (ATOM_DEVICE_LCD_SUPPORT)) &&
 743                             enc->enc_priv) {
 744                                 if (rdev->is_atom_bios) {
 745                                         struct radeon_encoder_atom_dig *dig = enc->enc_priv;
 746                                         if (dig->bl_dev) {
 747                                                 target = enc;
 748                                                 break;
 749                                         }
 750                                 } else {
 751                                         struct radeon_encoder_lvds *dig = enc->enc_priv;
 752                                         if (dig->bl_dev) {
 753                                                 target = enc;
 754                                                 break;
 755                                         }
 756                                 }
 757                         }
 758                 }
 759
 760                 atif->encoder_for_bl = target;
 761         }
 762
 763         if (atif->functions.sbios_requests && !atif->functions.system_params) {
 764                 /* XXX check this workraround, if sbios request function is
 765                  * present we have to see how it's configured in the system
 766                  * params
 767                  */
 768                 atif->functions.system_params = true;
 769         }
 770
 771         if (atif->functions.system_params) {
 772                 ret = radeon_atif_get_notification_params(handle,
 773                                 &atif->notification_cfg);
 774                 if (ret) {
 775                         DRM_DEBUG_DRIVER("Call to GET_SYSTEM_PARAMS failed: %d\n",
 776                                         ret);
 777                         /* Disable notification */
 778                         atif->notification_cfg.enabled = false;
 779                 }
 780         }
 781
 782 out:
 783         rdev->acpi_nb.notifier_call = radeon_acpi_event;
 784         register_acpi_notifier(&rdev->acpi_nb);
 785
 786         return ret;
 787 }
 788
 789 /**
 790  * radeon_acpi_fini - tear down driver acpi support
 791  *
 792  * @rdev: radeon_device pointer
 793  *
 794  * Unregisters with the acpi notifier chain (all asics).
 795  */
 796 void radeon_acpi_fini(struct radeon_device *rdev)
 797 {
 798         unregister_acpi_notifier(&rdev->acpi_nb);
 799 }