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

   1 /*
   2  * Copyright (c) 2010 Red Hat Inc.
   3  * Author : Dave Airlie <airlied@redhat.com>
   4  *
   5  * Licensed under GPLv2
   6  *
   7  * ATPX support for both Intel/ATI
   8  */
   9 #include <linux/vga_switcheroo.h>
  10 #include <linux/slab.h>
  11 #include <linux/acpi.h>
  12 #include <linux/pci.h>
  13 #include <linux/delay.h>
  14
  15 #include "amd_acpi.h"
  16
  17 struct amdgpu_atpx_functions {
  18         bool px_params;
  19         bool power_cntl;
  20         bool disp_mux_cntl;
  21         bool i2c_mux_cntl;
  22         bool switch_start;
  23         bool switch_end;
  24         bool disp_connectors_mapping;
  25         bool disp_detetion_ports;
  26 };
  27
  28 struct amdgpu_atpx {
  29         acpi_handle handle;
  30         struct amdgpu_atpx_functions functions;
  31         bool is_hybrid;
  32 };
  33
  34 static struct amdgpu_atpx_priv {
  35         bool atpx_detected;
  36         /* handle for device - and atpx */
  37         acpi_handle dhandle;
  38         acpi_handle other_handle;
  39         struct amdgpu_atpx atpx;
  40 } amdgpu_atpx_priv;
  41
  42 struct atpx_verify_interface {
  43         u16 size;               /* structure size in bytes (includes size field) */
  44         u16 version;            /* version */
  45         u32 function_bits;      /* supported functions bit vector */
  46 } __packed;
  47
  48 struct atpx_px_params {
  49         u16 size;               /* structure size in bytes (includes size field) */
  50         u32 valid_flags;        /* which flags are valid */
  51         u32 flags;              /* flags */
  52 } __packed;
  53
  54 struct atpx_power_control {
  55         u16 size;
  56         u8 dgpu_state;
  57 } __packed;
  58
  59 struct atpx_mux {
  60         u16 size;
  61         u16 mux;
  62 } __packed;
  63
  64 bool amdgpu_has_atpx(void) {
  65         return amdgpu_atpx_priv.atpx_detected;
  66 }
  67
  68 bool amdgpu_has_atpx_dgpu_power_cntl(void) {
  69         return amdgpu_atpx_priv.atpx.functions.power_cntl;
  70 }
  71
  72 bool amdgpu_is_atpx_hybrid(void) {
  73         return amdgpu_atpx_priv.atpx.is_hybrid;
  74 }
  75
  76 /**
  77  * amdgpu_atpx_call - call an ATPX method
  78  *
  79  * @handle: acpi handle
  80  * @function: the ATPX function to execute
  81  * @params: ATPX function params
  82  *
  83  * Executes the requested ATPX function (all asics).
  84  * Returns a pointer to the acpi output buffer.
  85  */
  86 static union acpi_object *amdgpu_atpx_call(acpi_handle handle, int function,
  87                                            struct acpi_buffer *params)
  88 {
  89         acpi_status status;
  90         union acpi_object atpx_arg_elements[2];
  91         struct acpi_object_list atpx_arg;
  92         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
  93
  94         atpx_arg.count = 2;
  95         atpx_arg.pointer = &atpx_arg_elements[0];
  96
  97         atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
  98         atpx_arg_elements[0].integer.value = function;
  99
 100         if (params) {
 101                 atpx_arg_elements[1].type = ACPI_TYPE_BUFFER;
 102                 atpx_arg_elements[1].buffer.length = params->length;
 103                 atpx_arg_elements[1].buffer.pointer = params->pointer;
 104         } else {
 105                 /* We need a second fake parameter */
 106                 atpx_arg_elements[1].type = ACPI_TYPE_INTEGER;
 107                 atpx_arg_elements[1].integer.value = 0;
 108         }
 109
 110         status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
 111
 112         /* Fail only if calling the method fails and ATPX is supported */
 113         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 114                 printk("failed to evaluate ATPX got %s\n",
 115                        acpi_format_exception(status));
 116                 kfree(buffer.pointer);
 117                 return NULL;
 118         }
 119
 120         return buffer.pointer;
 121 }
 122
 123 /**
 124  * amdgpu_atpx_parse_functions - parse supported functions
 125  *
 126  * @f: supported functions struct
 127  * @mask: supported functions mask from ATPX
 128  *
 129  * Use the supported functions mask from ATPX function
 130  * ATPX_FUNCTION_VERIFY_INTERFACE to determine what functions
 131  * are supported (all asics).
 132  */
 133 static void amdgpu_atpx_parse_functions(struct amdgpu_atpx_functions *f, u32 mask)
 134 {
 135         f->px_params = mask & ATPX_GET_PX_PARAMETERS_SUPPORTED;
 136         f->power_cntl = mask & ATPX_POWER_CONTROL_SUPPORTED;
 137         f->disp_mux_cntl = mask & ATPX_DISPLAY_MUX_CONTROL_SUPPORTED;
 138         f->i2c_mux_cntl = mask & ATPX_I2C_MUX_CONTROL_SUPPORTED;
 139         f->switch_start = mask & ATPX_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION_SUPPORTED;
 140         f->switch_end = mask & ATPX_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION_SUPPORTED;
 141         f->disp_connectors_mapping = mask & ATPX_GET_DISPLAY_CONNECTORS_MAPPING_SUPPORTED;
 142         f->disp_detetion_ports = mask & ATPX_GET_DISPLAY_DETECTION_PORTS_SUPPORTED;
 143 }
 144
 145 /**
 146  * amdgpu_atpx_validate_functions - validate ATPX functions
 147  *
 148  * @atpx: amdgpu atpx struct
 149  *
 150  * Validate that required functions are enabled (all asics).
 151  * returns 0 on success, error on failure.
 152  */
 153 static int amdgpu_atpx_validate(struct amdgpu_atpx *atpx)
 154 {
 155         u32 valid_bits = 0;
 156
 157         if (atpx->functions.px_params) {
 158                 union acpi_object *info;
 159                 struct atpx_px_params output;
 160                 size_t size;
 161
 162                 info = amdgpu_atpx_call(atpx->handle, ATPX_FUNCTION_GET_PX_PARAMETERS, NULL);
 163                 if (!info)
 164                         return -EIO;
 165
 166                 memset(&output, 0, sizeof(output));
 167
 168                 size = *(u16 *) info->buffer.pointer;
 169                 if (size < 10) {
 170                         printk("ATPX buffer is too small: %zu\n", size);
 171                         kfree(info);
 172                         return -EINVAL;
 173                 }
 174                 size = min(sizeof(output), size);
 175
 176                 memcpy(&output, info->buffer.pointer, size);
 177
 178                 valid_bits = output.flags & output.valid_flags;
 179
 180                 kfree(info);
 181         }
 182
 183         /* if separate mux flag is set, mux controls are required */
 184         if (valid_bits & ATPX_SEPARATE_MUX_FOR_I2C) {
 185                 atpx->functions.i2c_mux_cntl = true;
 186                 atpx->functions.disp_mux_cntl = true;
 187         }
 188         /* if any outputs are muxed, mux controls are required */
 189         if (valid_bits & (ATPX_CRT1_RGB_SIGNAL_MUXED |
 190                           ATPX_TV_SIGNAL_MUXED |
 191                           ATPX_DFP_SIGNAL_MUXED))
 192                 atpx->functions.disp_mux_cntl = true;
 193
 194
 195         /* some bioses set these bits rather than flagging power_cntl as supported */
 196         if (valid_bits & (ATPX_DYNAMIC_PX_SUPPORTED |
 197                           ATPX_DYNAMIC_DGPU_POWER_OFF_SUPPORTED))
 198                 atpx->functions.power_cntl = true;
 199
 200         atpx->is_hybrid = false;
 201         if (valid_bits & ATPX_MS_HYBRID_GFX_SUPPORTED) {
 202                 printk("ATPX Hybrid Graphics\n");
 203 #if 1
 204                 /* This is a temporary hack until the D3 cold support
 205                  * makes it upstream.  The ATPX power_control method seems
 206                  * to still work on even if the system should be using
 207                  * the new standardized hybrid D3 cold ACPI interface.
 208                  */
 209                 atpx->functions.power_cntl = true;
 210 #else
 211                 atpx->functions.power_cntl = false;
 212 #endif
 213                 atpx->is_hybrid = true;
 214         }
 215
 216         return 0;
 217 }
 218
 219 /**
 220  * amdgpu_atpx_verify_interface - verify ATPX
 221  *
 222  * @atpx: amdgpu atpx struct
 223  *
 224  * Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function
 225  * to initialize ATPX and determine what features are supported
 226  * (all asics).
 227  * returns 0 on success, error on failure.
 228  */
 229 static int amdgpu_atpx_verify_interface(struct amdgpu_atpx *atpx)
 230 {
 231         union acpi_object *info;
 232         struct atpx_verify_interface output;
 233         size_t size;
 234         int err = 0;
 235
 236         info = amdgpu_atpx_call(atpx->handle, ATPX_FUNCTION_VERIFY_INTERFACE, NULL);
 237         if (!info)
 238                 return -EIO;
 239
 240         memset(&output, 0, sizeof(output));
 241
 242         size = *(u16 *) info->buffer.pointer;
 243         if (size < 8) {
 244                 printk("ATPX buffer is too small: %zu\n", size);
 245                 err = -EINVAL;
 246                 goto out;
 247         }
 248         size = min(sizeof(output), size);
 249
 250         memcpy(&output, info->buffer.pointer, size);
 251
 252         /* TODO: check version? */
 253         printk("ATPX version %u, functions 0x%08x\n",
 254                output.version, output.function_bits);
 255
 256         amdgpu_atpx_parse_functions(&atpx->functions, output.function_bits);
 257
 258 out:
 259         kfree(info);
 260         return err;
 261 }
 262
 263 /**
 264  * amdgpu_atpx_set_discrete_state - power up/down discrete GPU
 265  *
 266  * @atpx: atpx info struct
 267  * @state: discrete GPU state (0 = power down, 1 = power up)
 268  *
 269  * Execute the ATPX_FUNCTION_POWER_CONTROL ATPX function to
 270  * power down/up the discrete GPU (all asics).
 271  * Returns 0 on success, error on failure.
 272  */
 273 static int amdgpu_atpx_set_discrete_state(struct amdgpu_atpx *atpx, u8 state)
 274 {
 275         struct acpi_buffer params;
 276         union acpi_object *info;
 277         struct atpx_power_control input;
 278
 279         if (atpx->functions.power_cntl) {
 280                 input.size = 3;
 281                 input.dgpu_state = state;
 282                 params.length = input.size;
 283                 params.pointer = &input;
 284                 info = amdgpu_atpx_call(atpx->handle,
 285                                         ATPX_FUNCTION_POWER_CONTROL,
 286                                         &params);
 287                 if (!info)
 288                         return -EIO;
 289                 kfree(info);
 290
 291                 /* 200ms delay is required after off */
 292                 if (state == 0)
 293                         msleep(200);
 294         }
 295         return 0;
 296 }
 297
 298 /**
 299  * amdgpu_atpx_switch_disp_mux - switch display mux
 300  *
 301  * @atpx: atpx info struct
 302  * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
 303  *
 304  * Execute the ATPX_FUNCTION_DISPLAY_MUX_CONTROL ATPX function to
 305  * switch the display mux between the discrete GPU and integrated GPU
 306  * (all asics).
 307  * Returns 0 on success, error on failure.
 308  */
 309 static int amdgpu_atpx_switch_disp_mux(struct amdgpu_atpx *atpx, u16 mux_id)
 310 {
 311         struct acpi_buffer params;
 312         union acpi_object *info;
 313         struct atpx_mux input;
 314
 315         if (atpx->functions.disp_mux_cntl) {
 316                 input.size = 4;
 317                 input.mux = mux_id;
 318                 params.length = input.size;
 319                 params.pointer = &input;
 320                 info = amdgpu_atpx_call(atpx->handle,
 321                                         ATPX_FUNCTION_DISPLAY_MUX_CONTROL,
 322                                         &params);
 323                 if (!info)
 324                         return -EIO;
 325                 kfree(info);
 326         }
 327         return 0;
 328 }
 329
 330 /**
 331  * amdgpu_atpx_switch_i2c_mux - switch i2c/hpd mux
 332  *
 333  * @atpx: atpx info struct
 334  * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
 335  *
 336  * Execute the ATPX_FUNCTION_I2C_MUX_CONTROL ATPX function to
 337  * switch the i2c/hpd mux between the discrete GPU and integrated GPU
 338  * (all asics).
 339  * Returns 0 on success, error on failure.
 340  */
 341 static int amdgpu_atpx_switch_i2c_mux(struct amdgpu_atpx *atpx, u16 mux_id)
 342 {
 343         struct acpi_buffer params;
 344         union acpi_object *info;
 345         struct atpx_mux input;
 346
 347         if (atpx->functions.i2c_mux_cntl) {
 348                 input.size = 4;
 349                 input.mux = mux_id;
 350                 params.length = input.size;
 351                 params.pointer = &input;
 352                 info = amdgpu_atpx_call(atpx->handle,
 353                                         ATPX_FUNCTION_I2C_MUX_CONTROL,
 354                                         &params);
 355                 if (!info)
 356                         return -EIO;
 357                 kfree(info);
 358         }
 359         return 0;
 360 }
 361
 362 /**
 363  * amdgpu_atpx_switch_start - notify the sbios of a GPU switch
 364  *
 365  * @atpx: atpx info struct
 366  * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
 367  *
 368  * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION ATPX
 369  * function to notify the sbios that a switch between the discrete GPU and
 370  * integrated GPU has begun (all asics).
 371  * Returns 0 on success, error on failure.
 372  */
 373 static int amdgpu_atpx_switch_start(struct amdgpu_atpx *atpx, u16 mux_id)
 374 {
 375         struct acpi_buffer params;
 376         union acpi_object *info;
 377         struct atpx_mux input;
 378
 379         if (atpx->functions.switch_start) {
 380                 input.size = 4;
 381                 input.mux = mux_id;
 382                 params.length = input.size;
 383                 params.pointer = &input;
 384                 info = amdgpu_atpx_call(atpx->handle,
 385                                         ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION,
 386                                         &params);
 387                 if (!info)
 388                         return -EIO;
 389                 kfree(info);
 390         }
 391         return 0;
 392 }
 393
 394 /**
 395  * amdgpu_atpx_switch_end - notify the sbios of a GPU switch
 396  *
 397  * @atpx: atpx info struct
 398  * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
 399  *
 400  * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION ATPX
 401  * function to notify the sbios that a switch between the discrete GPU and
 402  * integrated GPU has ended (all asics).
 403  * Returns 0 on success, error on failure.
 404  */
 405 static int amdgpu_atpx_switch_end(struct amdgpu_atpx *atpx, u16 mux_id)
 406 {
 407         struct acpi_buffer params;
 408         union acpi_object *info;
 409         struct atpx_mux input;
 410
 411         if (atpx->functions.switch_end) {
 412                 input.size = 4;
 413                 input.mux = mux_id;
 414                 params.length = input.size;
 415                 params.pointer = &input;
 416                 info = amdgpu_atpx_call(atpx->handle,
 417                                         ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION,
 418                                         &params);
 419                 if (!info)
 420                         return -EIO;
 421                 kfree(info);
 422         }
 423         return 0;
 424 }
 425
 426 /**
 427  * amdgpu_atpx_switchto - switch to the requested GPU
 428  *
 429  * @id: GPU to switch to
 430  *
 431  * Execute the necessary ATPX functions to switch between the discrete GPU and
 432  * integrated GPU (all asics).
 433  * Returns 0 on success, error on failure.
 434  */
 435 static int amdgpu_atpx_switchto(enum vga_switcheroo_client_id id)
 436 {
 437         u16 gpu_id;
 438
 439         if (id == VGA_SWITCHEROO_IGD)
 440                 gpu_id = ATPX_INTEGRATED_GPU;
 441         else
 442                 gpu_id = ATPX_DISCRETE_GPU;
 443
 444         amdgpu_atpx_switch_start(&amdgpu_atpx_priv.atpx, gpu_id);
 445         amdgpu_atpx_switch_disp_mux(&amdgpu_atpx_priv.atpx, gpu_id);
 446         amdgpu_atpx_switch_i2c_mux(&amdgpu_atpx_priv.atpx, gpu_id);
 447         amdgpu_atpx_switch_end(&amdgpu_atpx_priv.atpx, gpu_id);
 448
 449         return 0;
 450 }
 451
 452 /**
 453  * amdgpu_atpx_power_state - power down/up the requested GPU
 454  *
 455  * @id: GPU to power down/up
 456  * @state: requested power state (0 = off, 1 = on)
 457  *
 458  * Execute the necessary ATPX function to power down/up the discrete GPU
 459  * (all asics).
 460  * Returns 0 on success, error on failure.
 461  */
 462 static int amdgpu_atpx_power_state(enum vga_switcheroo_client_id id,
 463                                    enum vga_switcheroo_state state)
 464 {
 465         /* on w500 ACPI can't change intel gpu state */
 466         if (id == VGA_SWITCHEROO_IGD)
 467                 return 0;
 468
 469         amdgpu_atpx_set_discrete_state(&amdgpu_atpx_priv.atpx, state);
 470         return 0;
 471 }
 472
 473 /**
 474  * amdgpu_atpx_pci_probe_handle - look up the ATPX handle
 475  *
 476  * @pdev: pci device
 477  *
 478  * Look up the ATPX handles (all asics).
 479  * Returns true if the handles are found, false if not.
 480  */
 481 static bool amdgpu_atpx_pci_probe_handle(struct pci_dev *pdev)
 482 {
 483         acpi_handle dhandle, atpx_handle;
 484         acpi_status status;
 485
 486         dhandle = ACPI_HANDLE(&pdev->dev);
 487         if (!dhandle)
 488                 return false;
 489
 490         status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);
 491         if (ACPI_FAILURE(status)) {
 492                 amdgpu_atpx_priv.other_handle = dhandle;
 493                 return false;
 494         }
 495         amdgpu_atpx_priv.dhandle = dhandle;
 496         amdgpu_atpx_priv.atpx.handle = atpx_handle;
 497         return true;
 498 }
 499
 500 /**
 501  * amdgpu_atpx_init - verify the ATPX interface
 502  *
 503  * Verify the ATPX interface (all asics).
 504  * Returns 0 on success, error on failure.
 505  */
 506 static int amdgpu_atpx_init(void)
 507 {
 508         int r;
 509
 510         /* set up the ATPX handle */
 511         r = amdgpu_atpx_verify_interface(&amdgpu_atpx_priv.atpx);
 512         if (r)
 513                 return r;
 514
 515         /* validate the atpx setup */
 516         r = amdgpu_atpx_validate(&amdgpu_atpx_priv.atpx);
 517         if (r)
 518                 return r;
 519
 520         return 0;
 521 }
 522
 523 /**
 524  * amdgpu_atpx_get_client_id - get the client id
 525  *
 526  * @pdev: pci device
 527  *
 528  * look up whether we are the integrated or discrete GPU (all asics).
 529  * Returns the client id.
 530  */
 531 static int amdgpu_atpx_get_client_id(struct pci_dev *pdev)
 532 {
 533         if (amdgpu_atpx_priv.dhandle == ACPI_HANDLE(&pdev->dev))
 534                 return VGA_SWITCHEROO_IGD;
 535         else
 536                 return VGA_SWITCHEROO_DIS;
 537 }
 538
 539 static const struct vga_switcheroo_handler amdgpu_atpx_handler = {
 540         .switchto = amdgpu_atpx_switchto,
 541         .power_state = amdgpu_atpx_power_state,
 542         .get_client_id = amdgpu_atpx_get_client_id,
 543 };
 544
 545 /**
 546  * amdgpu_atpx_detect - detect whether we have PX
 547  *
 548  * Check if we have a PX system (all asics).
 549  * Returns true if we have a PX system, false if not.
 550  */
 551 static bool amdgpu_atpx_detect(void)
 552 {
 553         char acpi_method_name[255] = { 0 };
 554         struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
 555         struct pci_dev *pdev = NULL;
 556         bool has_atpx = false;
 557         int vga_count = 0;
 558
 559         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
 560                 vga_count++;
 561
 562                 has_atpx |= (amdgpu_atpx_pci_probe_handle(pdev) == true);
 563         }
 564
 565         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
 566                 vga_count++;
 567
 568                 has_atpx |= (amdgpu_atpx_pci_probe_handle(pdev) == true);
 569         }
 570
 571         if (has_atpx && vga_count == 2) {
 572                 acpi_get_name(amdgpu_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer);
 573                 printk(KERN_INFO "vga_switcheroo: detected switching method %s handle\n",
 574                        acpi_method_name);
 575                 amdgpu_atpx_priv.atpx_detected = true;
 576                 amdgpu_atpx_init();
 577                 return true;
 578         }
 579         return false;
 580 }
 581
 582 /**
 583  * amdgpu_register_atpx_handler - register with vga_switcheroo
 584  *
 585  * Register the PX callbacks with vga_switcheroo (all asics).
 586  */
 587 void amdgpu_register_atpx_handler(void)
 588 {
 589         bool r;
 590         enum vga_switcheroo_handler_flags_t handler_flags = 0;
 591
 592         /* detect if we have any ATPX + 2 VGA in the system */
 593         r = amdgpu_atpx_detect();
 594         if (!r)
 595                 return;
 596
 597         vga_switcheroo_register_handler(&amdgpu_atpx_handler, handler_flags);
 598 }
 599
 600 /**
 601  * amdgpu_unregister_atpx_handler - unregister with vga_switcheroo
 602  *
 603  * Unregister the PX callbacks with vga_switcheroo (all asics).
 604  */
 605 void amdgpu_unregister_atpx_handler(void)
 606 {
 607         vga_switcheroo_unregister_handler();
 608 }