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 <linux/suspend.h>
  30#include <acpi/video.h>
  31#include <acpi/actbl.h>
  32
  33#include <drm/drm_crtc_helper.h>
  34#include "amdgpu.h"
  35#include "amdgpu_pm.h"
  36#include "amdgpu_display.h"
  37#include "amd_acpi.h"
  38#include "atom.h"
  39
  40struct amdgpu_atif_notification_cfg {
  41	bool enabled;
  42	int command_code;
  43};
  44
  45struct amdgpu_atif_notifications {
  46	bool thermal_state;
  47	bool forced_power_state;
  48	bool system_power_state;
  49	bool brightness_change;
  50	bool dgpu_display_event;
  51	bool gpu_package_power_limit;
  52};
  53
  54struct amdgpu_atif_functions {
  55	bool system_params;
  56	bool sbios_requests;
  57	bool temperature_change;
  58	bool query_backlight_transfer_characteristics;
  59	bool ready_to_undock;
  60	bool external_gpu_information;
  61};
  62
  63struct amdgpu_atif {
  64	acpi_handle handle;
  65
  66	struct amdgpu_atif_notifications notifications;
  67	struct amdgpu_atif_functions functions;
  68	struct amdgpu_atif_notification_cfg notification_cfg;
  69#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
  70	struct backlight_device *bd;
  71#endif
  72	struct amdgpu_dm_backlight_caps backlight_caps;
  73};
  74
  75struct amdgpu_atcs_functions {
  76	bool get_ext_state;
  77	bool pcie_perf_req;
  78	bool pcie_dev_rdy;
  79	bool pcie_bus_width;
  80	bool power_shift_control;
  81};
  82
  83struct amdgpu_atcs {
  84	acpi_handle handle;
  85
  86	struct amdgpu_atcs_functions functions;
  87};
  88
  89static struct amdgpu_acpi_priv {
  90	struct amdgpu_atif atif;
  91	struct amdgpu_atcs atcs;
  92} amdgpu_acpi_priv;
  93
  94/* Call the ATIF method
  95 */
  96/**
  97 * amdgpu_atif_call - call an ATIF method
  98 *
  99 * @atif: atif structure
 100 * @function: the ATIF function to execute
 101 * @params: ATIF function params
 102 *
 103 * Executes the requested ATIF function (all asics).
 104 * Returns a pointer to the acpi output buffer.
 105 */
 106static union acpi_object *amdgpu_atif_call(struct amdgpu_atif *atif,
 107					   int function,
 108					   struct acpi_buffer *params)
 109{
 110	acpi_status status;
 111	union acpi_object atif_arg_elements[2];
 112	struct acpi_object_list atif_arg;
 113	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 114
 115	atif_arg.count = 2;
 116	atif_arg.pointer = &atif_arg_elements[0];
 117
 118	atif_arg_elements[0].type = ACPI_TYPE_INTEGER;
 119	atif_arg_elements[0].integer.value = function;
 120
 121	if (params) {
 122		atif_arg_elements[1].type = ACPI_TYPE_BUFFER;
 123		atif_arg_elements[1].buffer.length = params->length;
 124		atif_arg_elements[1].buffer.pointer = params->pointer;
 125	} else {
 126		/* We need a second fake parameter */
 127		atif_arg_elements[1].type = ACPI_TYPE_INTEGER;
 128		atif_arg_elements[1].integer.value = 0;
 129	}
 130
 131	status = acpi_evaluate_object(atif->handle, NULL, &atif_arg,
 132				      &buffer);
 133
 134	/* Fail only if calling the method fails and ATIF is supported */
 135	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 136		DRM_DEBUG_DRIVER("failed to evaluate ATIF got %s\n",
 137				 acpi_format_exception(status));
 138		kfree(buffer.pointer);
 139		return NULL;
 140	}
 141
 142	return buffer.pointer;
 143}
 144
 145/**
 146 * amdgpu_atif_parse_notification - parse supported notifications
 147 *
 148 * @n: supported notifications struct
 149 * @mask: supported notifications mask from ATIF
 150 *
 151 * Use the supported notifications mask from ATIF function
 152 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what notifications
 153 * are supported (all asics).
 154 */
 155static void amdgpu_atif_parse_notification(struct amdgpu_atif_notifications *n, u32 mask)
 156{
 157	n->thermal_state = mask & ATIF_THERMAL_STATE_CHANGE_REQUEST_SUPPORTED;
 158	n->forced_power_state = mask & ATIF_FORCED_POWER_STATE_CHANGE_REQUEST_SUPPORTED;
 159	n->system_power_state = mask & ATIF_SYSTEM_POWER_SOURCE_CHANGE_REQUEST_SUPPORTED;
 160	n->brightness_change = mask & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST_SUPPORTED;
 161	n->dgpu_display_event = mask & ATIF_DGPU_DISPLAY_EVENT_SUPPORTED;
 162	n->gpu_package_power_limit = mask & ATIF_GPU_PACKAGE_POWER_LIMIT_REQUEST_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 */
 175static 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->temperature_change = mask & ATIF_TEMPERATURE_CHANGE_NOTIFICATION_SUPPORTED;
 180	f->query_backlight_transfer_characteristics =
 181		mask & ATIF_QUERY_BACKLIGHT_TRANSFER_CHARACTERISTICS_SUPPORTED;
 182	f->ready_to_undock = mask & ATIF_READY_TO_UNDOCK_NOTIFICATION_SUPPORTED;
 183	f->external_gpu_information = mask & ATIF_GET_EXTERNAL_GPU_INFORMATION_SUPPORTED;
 184}
 185
 186/**
 187 * amdgpu_atif_verify_interface - verify ATIF
 188 *
 
 189 * @atif: amdgpu atif struct
 190 *
 191 * Execute the ATIF_FUNCTION_VERIFY_INTERFACE ATIF function
 192 * to initialize ATIF and determine what features are supported
 193 * (all asics).
 194 * returns 0 on success, error on failure.
 195 */
 196static int amdgpu_atif_verify_interface(struct amdgpu_atif *atif)
 197{
 198	union acpi_object *info;
 199	struct atif_verify_interface output;
 200	size_t size;
 201	int err = 0;
 202
 203	info = amdgpu_atif_call(atif, ATIF_FUNCTION_VERIFY_INTERFACE, NULL);
 204	if (!info)
 205		return -EIO;
 206
 207	memset(&output, 0, sizeof(output));
 208
 209	size = *(u16 *) info->buffer.pointer;
 210	if (size < 12) {
 211		DRM_INFO("ATIF buffer is too small: %zu\n", size);
 212		err = -EINVAL;
 213		goto out;
 214	}
 215	size = min(sizeof(output), size);
 216
 217	memcpy(&output, info->buffer.pointer, size);
 218
 219	/* TODO: check version? */
 220	DRM_DEBUG_DRIVER("ATIF version %u\n", output.version);
 221
 222	amdgpu_atif_parse_notification(&atif->notifications, output.notification_mask);
 223	amdgpu_atif_parse_functions(&atif->functions, output.function_bits);
 224
 225out:
 226	kfree(info);
 227	return err;
 228}
 229
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 230/**
 231 * amdgpu_atif_get_notification_params - determine notify configuration
 232 *
 233 * @atif: acpi handle
 
 234 *
 235 * Execute the ATIF_FUNCTION_GET_SYSTEM_PARAMETERS ATIF function
 236 * to determine if a notifier is used and if so which one
 237 * (all asics).  This is either Notify(VGA, 0x81) or Notify(VGA, n)
 238 * where n is specified in the result if a notifier is used.
 239 * Returns 0 on success, error on failure.
 240 */
 241static int amdgpu_atif_get_notification_params(struct amdgpu_atif *atif)
 242{
 243	union acpi_object *info;
 244	struct amdgpu_atif_notification_cfg *n = &atif->notification_cfg;
 245	struct atif_system_params params;
 246	size_t size;
 247	int err = 0;
 248
 249	info = amdgpu_atif_call(atif, ATIF_FUNCTION_GET_SYSTEM_PARAMETERS,
 250				NULL);
 251	if (!info) {
 252		err = -EIO;
 253		goto out;
 254	}
 255
 256	size = *(u16 *) info->buffer.pointer;
 257	if (size < 10) {
 258		err = -EINVAL;
 259		goto out;
 260	}
 261
 262	memset(&params, 0, sizeof(params));
 263	size = min(sizeof(params), size);
 264	memcpy(&params, info->buffer.pointer, size);
 265
 266	DRM_DEBUG_DRIVER("SYSTEM_PARAMS: mask = %#x, flags = %#x\n",
 267			params.flags, params.valid_mask);
 268	params.flags = params.flags & params.valid_mask;
 269
 270	if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_NONE) {
 271		n->enabled = false;
 272		n->command_code = 0;
 273	} else if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_81) {
 274		n->enabled = true;
 275		n->command_code = 0x81;
 276	} else {
 277		if (size < 11) {
 278			err = -EINVAL;
 279			goto out;
 280		}
 281		n->enabled = true;
 282		n->command_code = params.command_code;
 283	}
 284
 285out:
 286	DRM_DEBUG_DRIVER("Notification %s, command code = %#x\n",
 287			(n->enabled ? "enabled" : "disabled"),
 288			n->command_code);
 289	kfree(info);
 290	return err;
 291}
 292
 293/**
 294 * amdgpu_atif_query_backlight_caps - get min and max backlight input signal
 295 *
 296 * @atif: acpi handle
 297 *
 298 * Execute the QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS ATIF function
 299 * to determine the acceptable range of backlight values
 300 *
 301 * Backlight_caps.caps_valid will be set to true if the query is successful
 302 *
 303 * The input signals are in range 0-255
 304 *
 305 * This function assumes the display with backlight is the first LCD
 306 *
 307 * Returns 0 on success, error on failure.
 308 */
 309static int amdgpu_atif_query_backlight_caps(struct amdgpu_atif *atif)
 310{
 311	union acpi_object *info;
 312	struct atif_qbtc_output characteristics;
 313	struct atif_qbtc_arguments arguments;
 314	struct acpi_buffer params;
 315	size_t size;
 316	int err = 0;
 317
 318	arguments.size = sizeof(arguments);
 319	arguments.requested_display = ATIF_QBTC_REQUEST_LCD1;
 320
 321	params.length = sizeof(arguments);
 322	params.pointer = (void *)&arguments;
 323
 324	info = amdgpu_atif_call(atif,
 325		ATIF_FUNCTION_QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS,
 326		&params);
 327	if (!info) {
 328		err = -EIO;
 329		goto out;
 330	}
 331
 332	size = *(u16 *) info->buffer.pointer;
 333	if (size < 10) {
 334		err = -EINVAL;
 335		goto out;
 336	}
 337
 338	memset(&characteristics, 0, sizeof(characteristics));
 339	size = min(sizeof(characteristics), size);
 340	memcpy(&characteristics, info->buffer.pointer, size);
 341
 342	atif->backlight_caps.caps_valid = true;
 343	atif->backlight_caps.min_input_signal =
 344			characteristics.min_input_signal;
 345	atif->backlight_caps.max_input_signal =
 346			characteristics.max_input_signal;
 347out:
 348	kfree(info);
 349	return err;
 350}
 351
 352/**
 353 * amdgpu_atif_get_sbios_requests - get requested sbios event
 354 *
 355 * @atif: acpi handle
 356 * @req: atif sbios request struct
 357 *
 358 * Execute the ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS ATIF function
 359 * to determine what requests the sbios is making to the driver
 360 * (all asics).
 361 * Returns 0 on success, error on failure.
 362 */
 363static int amdgpu_atif_get_sbios_requests(struct amdgpu_atif *atif,
 364					  struct atif_sbios_requests *req)
 365{
 366	union acpi_object *info;
 367	size_t size;
 368	int count = 0;
 369
 370	info = amdgpu_atif_call(atif, ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS,
 371				NULL);
 372	if (!info)
 373		return -EIO;
 374
 375	size = *(u16 *)info->buffer.pointer;
 376	if (size < 0xd) {
 377		count = -EINVAL;
 378		goto out;
 379	}
 380	memset(req, 0, sizeof(*req));
 381
 382	size = min(sizeof(*req), size);
 383	memcpy(req, info->buffer.pointer, size);
 384	DRM_DEBUG_DRIVER("SBIOS pending requests: %#x\n", req->pending);
 385
 386	count = hweight32(req->pending);
 387
 388out:
 389	kfree(info);
 390	return count;
 391}
 392
 393/**
 394 * amdgpu_atif_handler - handle ATIF notify requests
 395 *
 396 * @adev: amdgpu_device pointer
 397 * @event: atif sbios request struct
 398 *
 399 * Checks the acpi event and if it matches an atif event,
 400 * handles it.
 401 *
 402 * Returns:
 403 * NOTIFY_BAD or NOTIFY_DONE, depending on the event.
 404 */
 405static int amdgpu_atif_handler(struct amdgpu_device *adev,
 406			       struct acpi_bus_event *event)
 407{
 408	struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
 409	int count;
 410
 411	DRM_DEBUG_DRIVER("event, device_class = %s, type = %#x\n",
 412			event->device_class, event->type);
 413
 414	if (strcmp(event->device_class, ACPI_VIDEO_CLASS) != 0)
 415		return NOTIFY_DONE;
 416
 417	/* Is this actually our event? */
 418	if (!atif->notification_cfg.enabled ||
 
 419	    event->type != atif->notification_cfg.command_code) {
 420		/* These events will generate keypresses otherwise */
 421		if (event->type == ACPI_VIDEO_NOTIFY_PROBE)
 422			return NOTIFY_BAD;
 423		else
 424			return NOTIFY_DONE;
 425	}
 426
 427	if (atif->functions.sbios_requests) {
 428		struct atif_sbios_requests req;
 429
 430		/* Check pending SBIOS requests */
 431		count = amdgpu_atif_get_sbios_requests(atif, &req);
 432
 433		if (count <= 0)
 434			return NOTIFY_BAD;
 435
 436		DRM_DEBUG_DRIVER("ATIF: %d pending SBIOS requests\n", count);
 437
 438		if (req.pending & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST) {
 439#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
 440			if (atif->bd) {
 441				DRM_DEBUG_DRIVER("Changing brightness to %d\n",
 442						 req.backlight_level);
 443				/*
 444				 * XXX backlight_device_set_brightness() is
 445				 * hardwired to post BACKLIGHT_UPDATE_SYSFS.
 446				 * It probably should accept 'reason' parameter.
 447				 */
 448				backlight_device_set_brightness(atif->bd, req.backlight_level);
 449			}
 450#endif
 451		}
 452
 453		if (req.pending & ATIF_DGPU_DISPLAY_EVENT) {
 454			if (adev->flags & AMD_IS_PX) {
 455				pm_runtime_get_sync(adev_to_drm(adev)->dev);
 456				/* Just fire off a uevent and let userspace tell us what to do */
 457				drm_helper_hpd_irq_event(adev_to_drm(adev));
 458				pm_runtime_mark_last_busy(adev_to_drm(adev)->dev);
 459				pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
 460			}
 461		}
 462		/* TODO: check other events */
 463	}
 464
 465	/* We've handled the event, stop the notifier chain. The ACPI interface
 466	 * overloads ACPI_VIDEO_NOTIFY_PROBE, we don't want to send that to
 467	 * userspace if the event was generated only to signal a SBIOS
 468	 * request.
 469	 */
 470	return NOTIFY_BAD;
 471}
 472
 473/* Call the ATCS method
 474 */
 475/**
 476 * amdgpu_atcs_call - call an ATCS method
 477 *
 478 * @atcs: atcs structure
 479 * @function: the ATCS function to execute
 480 * @params: ATCS function params
 481 *
 482 * Executes the requested ATCS function (all asics).
 483 * Returns a pointer to the acpi output buffer.
 484 */
 485static union acpi_object *amdgpu_atcs_call(struct amdgpu_atcs *atcs,
 486					   int function,
 487					   struct acpi_buffer *params)
 488{
 489	acpi_status status;
 490	union acpi_object atcs_arg_elements[2];
 491	struct acpi_object_list atcs_arg;
 492	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 493
 494	atcs_arg.count = 2;
 495	atcs_arg.pointer = &atcs_arg_elements[0];
 496
 497	atcs_arg_elements[0].type = ACPI_TYPE_INTEGER;
 498	atcs_arg_elements[0].integer.value = function;
 499
 500	if (params) {
 501		atcs_arg_elements[1].type = ACPI_TYPE_BUFFER;
 502		atcs_arg_elements[1].buffer.length = params->length;
 503		atcs_arg_elements[1].buffer.pointer = params->pointer;
 504	} else {
 505		/* We need a second fake parameter */
 506		atcs_arg_elements[1].type = ACPI_TYPE_INTEGER;
 507		atcs_arg_elements[1].integer.value = 0;
 508	}
 509
 510	status = acpi_evaluate_object(atcs->handle, NULL, &atcs_arg, &buffer);
 511
 512	/* Fail only if calling the method fails and ATIF is supported */
 513	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 514		DRM_DEBUG_DRIVER("failed to evaluate ATCS got %s\n",
 515				 acpi_format_exception(status));
 516		kfree(buffer.pointer);
 517		return NULL;
 518	}
 519
 520	return buffer.pointer;
 521}
 522
 523/**
 524 * amdgpu_atcs_parse_functions - parse supported functions
 525 *
 526 * @f: supported functions struct
 527 * @mask: supported functions mask from ATCS
 528 *
 529 * Use the supported functions mask from ATCS function
 530 * ATCS_FUNCTION_VERIFY_INTERFACE to determine what functions
 531 * are supported (all asics).
 532 */
 533static void amdgpu_atcs_parse_functions(struct amdgpu_atcs_functions *f, u32 mask)
 534{
 535	f->get_ext_state = mask & ATCS_GET_EXTERNAL_STATE_SUPPORTED;
 536	f->pcie_perf_req = mask & ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED;
 537	f->pcie_dev_rdy = mask & ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED;
 538	f->pcie_bus_width = mask & ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED;
 539	f->power_shift_control = mask & ATCS_SET_POWER_SHIFT_CONTROL_SUPPORTED;
 540}
 541
 542/**
 543 * amdgpu_atcs_verify_interface - verify ATCS
 544 *
 
 545 * @atcs: amdgpu atcs struct
 546 *
 547 * Execute the ATCS_FUNCTION_VERIFY_INTERFACE ATCS function
 548 * to initialize ATCS and determine what features are supported
 549 * (all asics).
 550 * returns 0 on success, error on failure.
 551 */
 552static int amdgpu_atcs_verify_interface(struct amdgpu_atcs *atcs)
 
 553{
 554	union acpi_object *info;
 555	struct atcs_verify_interface output;
 556	size_t size;
 557	int err = 0;
 558
 559	info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_VERIFY_INTERFACE, NULL);
 560	if (!info)
 561		return -EIO;
 562
 563	memset(&output, 0, sizeof(output));
 564
 565	size = *(u16 *) info->buffer.pointer;
 566	if (size < 8) {
 567		DRM_INFO("ATCS buffer is too small: %zu\n", size);
 568		err = -EINVAL;
 569		goto out;
 570	}
 571	size = min(sizeof(output), size);
 572
 573	memcpy(&output, info->buffer.pointer, size);
 574
 575	/* TODO: check version? */
 576	DRM_DEBUG_DRIVER("ATCS version %u\n", output.version);
 577
 578	amdgpu_atcs_parse_functions(&atcs->functions, output.function_bits);
 579
 580out:
 581	kfree(info);
 582	return err;
 583}
 584
 585/**
 586 * amdgpu_acpi_is_pcie_performance_request_supported
 587 *
 588 * @adev: amdgpu_device pointer
 589 *
 590 * Check if the ATCS pcie_perf_req and pcie_dev_rdy methods
 591 * are supported (all asics).
 592 * returns true if supported, false if not.
 593 */
 594bool amdgpu_acpi_is_pcie_performance_request_supported(struct amdgpu_device *adev)
 595{
 596	struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
 597
 598	if (atcs->functions.pcie_perf_req && atcs->functions.pcie_dev_rdy)
 599		return true;
 600
 601	return false;
 602}
 603
 604/**
 605 * amdgpu_acpi_is_power_shift_control_supported
 606 *
 607 * Check if the ATCS power shift control method
 608 * is supported.
 609 * returns true if supported, false if not.
 610 */
 611bool amdgpu_acpi_is_power_shift_control_supported(void)
 612{
 613	return amdgpu_acpi_priv.atcs.functions.power_shift_control;
 614}
 615
 616/**
 617 * amdgpu_acpi_pcie_notify_device_ready
 618 *
 619 * @adev: amdgpu_device pointer
 620 *
 621 * Executes the PCIE_DEVICE_READY_NOTIFICATION method
 622 * (all asics).
 623 * returns 0 on success, error on failure.
 624 */
 625int amdgpu_acpi_pcie_notify_device_ready(struct amdgpu_device *adev)
 626{
 
 627	union acpi_object *info;
 628	struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
 
 
 
 
 
 629
 630	if (!atcs->functions.pcie_dev_rdy)
 631		return -EINVAL;
 632
 633	info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION, NULL);
 634	if (!info)
 635		return -EIO;
 636
 637	kfree(info);
 638
 639	return 0;
 640}
 641
 642/**
 643 * amdgpu_acpi_pcie_performance_request
 644 *
 645 * @adev: amdgpu_device pointer
 646 * @perf_req: requested perf level (pcie gen speed)
 647 * @advertise: set advertise caps flag if set
 648 *
 649 * Executes the PCIE_PERFORMANCE_REQUEST method to
 650 * change the pcie gen speed (all asics).
 651 * returns 0 on success, error on failure.
 652 */
 653int amdgpu_acpi_pcie_performance_request(struct amdgpu_device *adev,
 654					 u8 perf_req, bool advertise)
 655{
 
 656	union acpi_object *info;
 657	struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
 658	struct atcs_pref_req_input atcs_input;
 659	struct atcs_pref_req_output atcs_output;
 660	struct acpi_buffer params;
 661	size_t size;
 662	u32 retry = 3;
 663
 664	if (amdgpu_acpi_pcie_notify_device_ready(adev))
 665		return -EINVAL;
 666
 
 
 
 
 
 667	if (!atcs->functions.pcie_perf_req)
 668		return -EINVAL;
 669
 670	atcs_input.size = sizeof(struct atcs_pref_req_input);
 671	/* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
 672	atcs_input.client_id = adev->pdev->devfn | (adev->pdev->bus->number << 8);
 673	atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
 674	atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
 675	if (advertise)
 676		atcs_input.flags |= ATCS_ADVERTISE_CAPS;
 677	atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
 678	atcs_input.perf_req = perf_req;
 679
 680	params.length = sizeof(struct atcs_pref_req_input);
 681	params.pointer = &atcs_input;
 682
 683	while (retry--) {
 684		info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST, &params);
 685		if (!info)
 686			return -EIO;
 687
 688		memset(&atcs_output, 0, sizeof(atcs_output));
 689
 690		size = *(u16 *) info->buffer.pointer;
 691		if (size < 3) {
 692			DRM_INFO("ATCS buffer is too small: %zu\n", size);
 693			kfree(info);
 694			return -EINVAL;
 695		}
 696		size = min(sizeof(atcs_output), size);
 697
 698		memcpy(&atcs_output, info->buffer.pointer, size);
 699
 700		kfree(info);
 701
 702		switch (atcs_output.ret_val) {
 703		case ATCS_REQUEST_REFUSED:
 704		default:
 705			return -EINVAL;
 706		case ATCS_REQUEST_COMPLETE:
 707			return 0;
 708		case ATCS_REQUEST_IN_PROGRESS:
 709			udelay(10);
 710			break;
 711		}
 712	}
 713
 714	return 0;
 715}
 716
 717/**
 718 * amdgpu_acpi_power_shift_control
 719 *
 720 * @adev: amdgpu_device pointer
 721 * @dev_state: device acpi state
 722 * @drv_state: driver state
 723 *
 724 * Executes the POWER_SHIFT_CONTROL method to
 725 * communicate current dGPU device state and
 726 * driver state to APU/SBIOS.
 727 * returns 0 on success, error on failure.
 728 */
 729int amdgpu_acpi_power_shift_control(struct amdgpu_device *adev,
 730				    u8 dev_state, bool drv_state)
 731{
 732	union acpi_object *info;
 733	struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
 734	struct atcs_pwr_shift_input atcs_input;
 735	struct acpi_buffer params;
 736
 737	if (!amdgpu_acpi_is_power_shift_control_supported())
 738		return -EINVAL;
 739
 740	atcs_input.size = sizeof(struct atcs_pwr_shift_input);
 741	/* dGPU id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
 742	atcs_input.dgpu_id = adev->pdev->devfn | (adev->pdev->bus->number << 8);
 743	atcs_input.dev_acpi_state = dev_state;
 744	atcs_input.drv_state = drv_state;
 745
 746	params.length = sizeof(struct atcs_pwr_shift_input);
 747	params.pointer = &atcs_input;
 748
 749	info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_POWER_SHIFT_CONTROL, &params);
 750	if (!info) {
 751		DRM_ERROR("ATCS PSC update failed\n");
 752		return -EIO;
 753	}
 754
 755	return 0;
 756}
 757
 758/**
 759 * amdgpu_acpi_smart_shift_update - update dGPU device state to SBIOS
 760 *
 761 * @dev: drm_device pointer
 762 * @ss_state: current smart shift event
 763 *
 764 * returns 0 on success,
 765 * otherwise return error number.
 766 */
 767int amdgpu_acpi_smart_shift_update(struct drm_device *dev, enum amdgpu_ss ss_state)
 768{
 769	struct amdgpu_device *adev = drm_to_adev(dev);
 770	int r;
 771
 772	if (!amdgpu_device_supports_smart_shift(dev))
 773		return 0;
 774
 775	switch (ss_state) {
 776	/* SBIOS trigger “stop”, “enable” and “start” at D0, Driver Operational.
 777	 * SBIOS trigger “stop” at D3, Driver Not Operational.
 778	 * SBIOS trigger “stop” and “disable” at D0, Driver NOT operational.
 779	 */
 780	case AMDGPU_SS_DRV_LOAD:
 781		r = amdgpu_acpi_power_shift_control(adev,
 782						    AMDGPU_ATCS_PSC_DEV_STATE_D0,
 783						    AMDGPU_ATCS_PSC_DRV_STATE_OPR);
 784		break;
 785	case AMDGPU_SS_DEV_D0:
 786		r = amdgpu_acpi_power_shift_control(adev,
 787						    AMDGPU_ATCS_PSC_DEV_STATE_D0,
 788						    AMDGPU_ATCS_PSC_DRV_STATE_OPR);
 789		break;
 790	case AMDGPU_SS_DEV_D3:
 791		r = amdgpu_acpi_power_shift_control(adev,
 792						    AMDGPU_ATCS_PSC_DEV_STATE_D3_HOT,
 793						    AMDGPU_ATCS_PSC_DRV_STATE_NOT_OPR);
 794		break;
 795	case AMDGPU_SS_DRV_UNLOAD:
 796		r = amdgpu_acpi_power_shift_control(adev,
 797						    AMDGPU_ATCS_PSC_DEV_STATE_D0,
 798						    AMDGPU_ATCS_PSC_DRV_STATE_NOT_OPR);
 799		break;
 800	default:
 801		return -EINVAL;
 802	}
 803
 804	return r;
 805}
 806
 807/**
 808 * amdgpu_acpi_event - handle notify events
 809 *
 810 * @nb: notifier block
 811 * @val: val
 812 * @data: acpi event
 813 *
 814 * Calls relevant amdgpu functions in response to various
 815 * acpi events.
 816 * Returns NOTIFY code
 817 */
 818static int amdgpu_acpi_event(struct notifier_block *nb,
 819			     unsigned long val,
 820			     void *data)
 821{
 822	struct amdgpu_device *adev = container_of(nb, struct amdgpu_device, acpi_nb);
 823	struct acpi_bus_event *entry = (struct acpi_bus_event *)data;
 824
 825	if (strcmp(entry->device_class, ACPI_AC_CLASS) == 0) {
 826		if (power_supply_is_system_supplied() > 0)
 827			DRM_DEBUG_DRIVER("pm: AC\n");
 828		else
 829			DRM_DEBUG_DRIVER("pm: DC\n");
 830
 831		amdgpu_pm_acpi_event_handler(adev);
 832	}
 833
 834	/* Check for pending SBIOS requests */
 835	return amdgpu_atif_handler(adev, entry);
 836}
 837
 838/* Call all ACPI methods here */
 839/**
 840 * amdgpu_acpi_init - init driver acpi support
 841 *
 842 * @adev: amdgpu_device pointer
 843 *
 844 * Verifies the AMD ACPI interfaces and registers with the acpi
 845 * notifier chain (all asics).
 846 * Returns 0 on success, error on failure.
 847 */
 848int amdgpu_acpi_init(struct amdgpu_device *adev)
 849{
 850	struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 851
 852#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
 853	if (atif->notifications.brightness_change) {
 
 854		if (amdgpu_device_has_dc_support(adev)) {
 855#if defined(CONFIG_DRM_AMD_DC)
 856			struct amdgpu_display_manager *dm = &adev->dm;
 857			if (dm->backlight_dev)
 858				atif->bd = dm->backlight_dev;
 859#endif
 860		} else {
 861			struct drm_encoder *tmp;
 862
 863			/* Find the encoder controlling the brightness */
 864			list_for_each_entry(tmp, &adev_to_drm(adev)->mode_config.encoder_list,
 865					    head) {
 866				struct amdgpu_encoder *enc = to_amdgpu_encoder(tmp);
 867
 868				if ((enc->devices & (ATOM_DEVICE_LCD_SUPPORT)) &&
 869				    enc->enc_priv) {
 870					struct amdgpu_encoder_atom_dig *dig = enc->enc_priv;
 871					if (dig->bl_dev) {
 872						atif->bd = dig->bl_dev;
 873						break;
 874					}
 875				}
 876			}
 877		}
 878	}
 879#endif
 880	adev->acpi_nb.notifier_call = amdgpu_acpi_event;
 881	register_acpi_notifier(&adev->acpi_nb);
 882
 883	return 0;
 884}
 885
 886void amdgpu_acpi_get_backlight_caps(struct amdgpu_dm_backlight_caps *caps)
 887{
 888	struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
 889
 890	caps->caps_valid = atif->backlight_caps.caps_valid;
 891	caps->min_input_signal = atif->backlight_caps.min_input_signal;
 892	caps->max_input_signal = atif->backlight_caps.max_input_signal;
 893}
 894
 895/**
 896 * amdgpu_acpi_fini - tear down driver acpi support
 897 *
 898 * @adev: amdgpu_device pointer
 899 *
 900 * Unregisters with the acpi notifier chain (all asics).
 901 */
 902void amdgpu_acpi_fini(struct amdgpu_device *adev)
 903{
 904	unregister_acpi_notifier(&adev->acpi_nb);
 905}
 906
 907/**
 908 * amdgpu_atif_pci_probe_handle - look up the ATIF handle
 909 *
 910 * @pdev: pci device
 911 *
 912 * Look up the ATIF handles (all asics).
 913 * Returns true if the handle is found, false if not.
 914 */
 915static bool amdgpu_atif_pci_probe_handle(struct pci_dev *pdev)
 916{
 917	char acpi_method_name[255] = { 0 };
 918	struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
 919	acpi_handle dhandle, atif_handle;
 920	acpi_status status;
 921	int ret;
 922
 923	dhandle = ACPI_HANDLE(&pdev->dev);
 924	if (!dhandle)
 925		return false;
 926
 927	status = acpi_get_handle(dhandle, "ATIF", &atif_handle);
 928	if (ACPI_FAILURE(status)) {
 929		return false;
 930	}
 931	amdgpu_acpi_priv.atif.handle = atif_handle;
 932	acpi_get_name(amdgpu_acpi_priv.atif.handle, ACPI_FULL_PATHNAME, &buffer);
 933	DRM_DEBUG_DRIVER("Found ATIF handle %s\n", acpi_method_name);
 934	ret = amdgpu_atif_verify_interface(&amdgpu_acpi_priv.atif);
 935	if (ret) {
 936		amdgpu_acpi_priv.atif.handle = 0;
 937		return false;
 938	}
 939	return true;
 940}
 941
 942/**
 943 * amdgpu_atcs_pci_probe_handle - look up the ATCS handle
 944 *
 945 * @pdev: pci device
 946 *
 947 * Look up the ATCS handles (all asics).
 948 * Returns true if the handle is found, false if not.
 949 */
 950static bool amdgpu_atcs_pci_probe_handle(struct pci_dev *pdev)
 951{
 952	char acpi_method_name[255] = { 0 };
 953	struct acpi_buffer buffer = { sizeof(acpi_method_name), acpi_method_name };
 954	acpi_handle dhandle, atcs_handle;
 955	acpi_status status;
 956	int ret;
 957
 958	dhandle = ACPI_HANDLE(&pdev->dev);
 959	if (!dhandle)
 960		return false;
 961
 962	status = acpi_get_handle(dhandle, "ATCS", &atcs_handle);
 963	if (ACPI_FAILURE(status)) {
 964		return false;
 965	}
 966	amdgpu_acpi_priv.atcs.handle = atcs_handle;
 967	acpi_get_name(amdgpu_acpi_priv.atcs.handle, ACPI_FULL_PATHNAME, &buffer);
 968	DRM_DEBUG_DRIVER("Found ATCS handle %s\n", acpi_method_name);
 969	ret = amdgpu_atcs_verify_interface(&amdgpu_acpi_priv.atcs);
 970	if (ret) {
 971		amdgpu_acpi_priv.atcs.handle = 0;
 972		return false;
 973	}
 974	return true;
 975}
 976
 977/*
 978 * amdgpu_acpi_detect - detect ACPI ATIF/ATCS methods
 979 *
 980 * Check if we have the ATIF/ATCS methods and populate
 981 * the structures in the driver.
 982 */
 983void amdgpu_acpi_detect(void)
 984{
 985	struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
 986	struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
 987	struct pci_dev *pdev = NULL;
 988	int ret;
 989
 990	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
 991		if (!atif->handle)
 992			amdgpu_atif_pci_probe_handle(pdev);
 993		if (!atcs->handle)
 994			amdgpu_atcs_pci_probe_handle(pdev);
 995	}
 996
 997	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
 998		if (!atif->handle)
 999			amdgpu_atif_pci_probe_handle(pdev);
1000		if (!atcs->handle)
1001			amdgpu_atcs_pci_probe_handle(pdev);
1002	}
1003
1004	if (atif->functions.sbios_requests && !atif->functions.system_params) {
1005		/* XXX check this workraround, if sbios request function is
1006		 * present we have to see how it's configured in the system
1007		 * params
1008		 */
1009		atif->functions.system_params = true;
1010	}
1011
1012	if (atif->functions.system_params) {
1013		ret = amdgpu_atif_get_notification_params(atif);
1014		if (ret) {
1015			DRM_DEBUG_DRIVER("Call to GET_SYSTEM_PARAMS failed: %d\n",
1016					ret);
1017			/* Disable notification */
1018			atif->notification_cfg.enabled = false;
1019		}
1020	}
1021
1022	if (atif->functions.query_backlight_transfer_characteristics) {
1023		ret = amdgpu_atif_query_backlight_caps(atif);
1024		if (ret) {
1025			DRM_DEBUG_DRIVER("Call to QUERY_BACKLIGHT_TRANSFER_CHARACTERISTICS failed: %d\n",
1026					ret);
1027			atif->backlight_caps.caps_valid = false;
1028		}
1029	} else {
1030		atif->backlight_caps.caps_valid = false;
1031	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1032}
1033
1034/**
1035 * amdgpu_acpi_is_s0ix_supported
1036 *
1037 * @adev: amdgpu_device_pointer
1038 *
1039 * returns true if supported, false if not.
1040 */
1041bool amdgpu_acpi_is_s0ix_supported(struct amdgpu_device *adev)
1042{
1043#if IS_ENABLED(CONFIG_AMD_PMC) && IS_ENABLED(CONFIG_SUSPEND)
1044	if (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0) {
1045		if (adev->flags & AMD_IS_APU)
1046			return pm_suspend_target_state == PM_SUSPEND_TO_IDLE;
1047	}
1048#endif
1049	return false;
1050}