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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (c) 2010 Red Hat Inc.4 * Author : Dave Airlie <airlied@redhat.com>5 *6 * ATPX support for both Intel/ATI7 */8#include <linux/vga_switcheroo.h>9#include <linux/slab.h>10#include <linux/acpi.h>11#include <linux/pci.h>12#include <linux/delay.h>13 14#include "radeon_acpi.h"15 16struct radeon_atpx_functions {17 bool px_params;18 bool power_cntl;19 bool disp_mux_cntl;20 bool i2c_mux_cntl;21 bool switch_start;22 bool switch_end;23 bool disp_connectors_mapping;24 bool disp_detetion_ports;25};26 27struct radeon_atpx {28 acpi_handle handle;29 struct radeon_atpx_functions functions;30 bool is_hybrid;31 bool dgpu_req_power_for_displays;32};33 34static struct radeon_atpx_priv {35 bool atpx_detected;36 bool bridge_pm_usable;37 /* handle for device - and atpx */38 acpi_handle dhandle;39 struct radeon_atpx atpx;40} radeon_atpx_priv;41 42struct 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 48struct 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 54struct atpx_power_control {55 u16 size;56 u8 dgpu_state;57} __packed;58 59struct atpx_mux {60 u16 size;61 u16 mux;62} __packed;63 64bool radeon_has_atpx(void)65{66 return radeon_atpx_priv.atpx_detected;67}68 69bool radeon_has_atpx_dgpu_power_cntl(void)70{71 return radeon_atpx_priv.atpx.functions.power_cntl;72}73 74bool radeon_is_atpx_hybrid(void)75{76 return radeon_atpx_priv.atpx.is_hybrid;77}78 79bool radeon_atpx_dgpu_req_power_for_displays(void)80{81 return radeon_atpx_priv.atpx.dgpu_req_power_for_displays;82}83 84/**85 * radeon_atpx_call - call an ATPX method86 *87 * @handle: acpi handle88 * @function: the ATPX function to execute89 * @params: ATPX function params90 *91 * Executes the requested ATPX function (all asics).92 * Returns a pointer to the acpi output buffer.93 */94static union acpi_object *radeon_atpx_call(acpi_handle handle, int function,95 struct acpi_buffer *params)96{97 acpi_status status;98 union acpi_object atpx_arg_elements[2];99 struct acpi_object_list atpx_arg;100 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };101 102 atpx_arg.count = 2;103 atpx_arg.pointer = &atpx_arg_elements[0];104 105 atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;106 atpx_arg_elements[0].integer.value = function;107 108 if (params) {109 atpx_arg_elements[1].type = ACPI_TYPE_BUFFER;110 atpx_arg_elements[1].buffer.length = params->length;111 atpx_arg_elements[1].buffer.pointer = params->pointer;112 } else {113 /* We need a second fake parameter */114 atpx_arg_elements[1].type = ACPI_TYPE_INTEGER;115 atpx_arg_elements[1].integer.value = 0;116 }117 118 status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);119 120 /* Fail only if calling the method fails and ATPX is supported */121 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {122 pr_err("failed to evaluate ATPX got %s\n",123 acpi_format_exception(status));124 kfree(buffer.pointer);125 return NULL;126 }127 128 return buffer.pointer;129}130 131/**132 * radeon_atpx_parse_functions - parse supported functions133 *134 * @f: supported functions struct135 * @mask: supported functions mask from ATPX136 *137 * Use the supported functions mask from ATPX function138 * ATPX_FUNCTION_VERIFY_INTERFACE to determine what functions139 * are supported (all asics).140 */141static void radeon_atpx_parse_functions(struct radeon_atpx_functions *f, u32 mask)142{143 f->px_params = mask & ATPX_GET_PX_PARAMETERS_SUPPORTED;144 f->power_cntl = mask & ATPX_POWER_CONTROL_SUPPORTED;145 f->disp_mux_cntl = mask & ATPX_DISPLAY_MUX_CONTROL_SUPPORTED;146 f->i2c_mux_cntl = mask & ATPX_I2C_MUX_CONTROL_SUPPORTED;147 f->switch_start = mask & ATPX_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION_SUPPORTED;148 f->switch_end = mask & ATPX_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION_SUPPORTED;149 f->disp_connectors_mapping = mask & ATPX_GET_DISPLAY_CONNECTORS_MAPPING_SUPPORTED;150 f->disp_detetion_ports = mask & ATPX_GET_DISPLAY_DETECTION_PORTS_SUPPORTED;151}152 153/**154 * radeon_atpx_validate() - validate ATPX functions155 *156 * @atpx: radeon atpx struct157 *158 * Validate that required functions are enabled (all asics).159 * returns 0 on success, error on failure.160 */161static int radeon_atpx_validate(struct radeon_atpx *atpx)162{163 u32 valid_bits = 0;164 165 if (atpx->functions.px_params) {166 union acpi_object *info;167 struct atpx_px_params output;168 size_t size;169 170 info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_GET_PX_PARAMETERS, NULL);171 if (!info)172 return -EIO;173 174 memset(&output, 0, sizeof(output));175 176 size = *(u16 *) info->buffer.pointer;177 if (size < 10) {178 pr_err("ATPX buffer is too small: %zu\n", size);179 kfree(info);180 return -EINVAL;181 }182 size = min(sizeof(output), size);183 184 memcpy(&output, info->buffer.pointer, size);185 186 valid_bits = output.flags & output.valid_flags;187 188 kfree(info);189 }190 191 /* if separate mux flag is set, mux controls are required */192 if (valid_bits & ATPX_SEPARATE_MUX_FOR_I2C) {193 atpx->functions.i2c_mux_cntl = true;194 atpx->functions.disp_mux_cntl = true;195 }196 /* if any outputs are muxed, mux controls are required */197 if (valid_bits & (ATPX_CRT1_RGB_SIGNAL_MUXED |198 ATPX_TV_SIGNAL_MUXED |199 ATPX_DFP_SIGNAL_MUXED))200 atpx->functions.disp_mux_cntl = true;201 202 /* some bioses set these bits rather than flagging power_cntl as supported */203 if (valid_bits & (ATPX_DYNAMIC_PX_SUPPORTED |204 ATPX_DYNAMIC_DGPU_POWER_OFF_SUPPORTED))205 atpx->functions.power_cntl = true;206 207 atpx->is_hybrid = false;208 if (valid_bits & ATPX_MS_HYBRID_GFX_SUPPORTED) {209 pr_info("ATPX Hybrid Graphics\n");210 /*211 * Disable legacy PM methods only when pcie port PM is usable,212 * otherwise the device might fail to power off or power on.213 */214 atpx->functions.power_cntl = !radeon_atpx_priv.bridge_pm_usable;215 atpx->is_hybrid = true;216 }217 218 return 0;219}220 221/**222 * radeon_atpx_verify_interface - verify ATPX223 *224 * @atpx: radeon atpx struct225 *226 * Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function227 * to initialize ATPX and determine what features are supported228 * (all asics).229 * returns 0 on success, error on failure.230 */231static int radeon_atpx_verify_interface(struct radeon_atpx *atpx)232{233 union acpi_object *info;234 struct atpx_verify_interface output;235 size_t size;236 int err = 0;237 238 info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_VERIFY_INTERFACE, NULL);239 if (!info)240 return -EIO;241 242 memset(&output, 0, sizeof(output));243 244 size = *(u16 *) info->buffer.pointer;245 if (size < 8) {246 pr_err("ATPX buffer is too small: %zu\n", size);247 err = -EINVAL;248 goto out;249 }250 size = min(sizeof(output), size);251 252 memcpy(&output, info->buffer.pointer, size);253 254 /* TODO: check version? */255 pr_info("ATPX version %u, functions 0x%08x\n",256 output.version, output.function_bits);257 258 radeon_atpx_parse_functions(&atpx->functions, output.function_bits);259 260out:261 kfree(info);262 return err;263}264 265/**266 * radeon_atpx_set_discrete_state - power up/down discrete GPU267 *268 * @atpx: atpx info struct269 * @state: discrete GPU state (0 = power down, 1 = power up)270 *271 * Execute the ATPX_FUNCTION_POWER_CONTROL ATPX function to272 * power down/up the discrete GPU (all asics).273 * Returns 0 on success, error on failure.274 */275static int radeon_atpx_set_discrete_state(struct radeon_atpx *atpx, u8 state)276{277 struct acpi_buffer params;278 union acpi_object *info;279 struct atpx_power_control input;280 281 if (atpx->functions.power_cntl) {282 input.size = 3;283 input.dgpu_state = state;284 params.length = input.size;285 params.pointer = &input;286 info = radeon_atpx_call(atpx->handle,287 ATPX_FUNCTION_POWER_CONTROL,288 ¶ms);289 if (!info)290 return -EIO;291 kfree(info);292 293 /* 200ms delay is required after off */294 if (state == 0)295 msleep(200);296 }297 return 0;298}299 300/**301 * radeon_atpx_switch_disp_mux - switch display mux302 *303 * @atpx: atpx info struct304 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)305 *306 * Execute the ATPX_FUNCTION_DISPLAY_MUX_CONTROL ATPX function to307 * switch the display mux between the discrete GPU and integrated GPU308 * (all asics).309 * Returns 0 on success, error on failure.310 */311static int radeon_atpx_switch_disp_mux(struct radeon_atpx *atpx, u16 mux_id)312{313 struct acpi_buffer params;314 union acpi_object *info;315 struct atpx_mux input;316 317 if (atpx->functions.disp_mux_cntl) {318 input.size = 4;319 input.mux = mux_id;320 params.length = input.size;321 params.pointer = &input;322 info = radeon_atpx_call(atpx->handle,323 ATPX_FUNCTION_DISPLAY_MUX_CONTROL,324 ¶ms);325 if (!info)326 return -EIO;327 kfree(info);328 }329 return 0;330}331 332/**333 * radeon_atpx_switch_i2c_mux - switch i2c/hpd mux334 *335 * @atpx: atpx info struct336 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)337 *338 * Execute the ATPX_FUNCTION_I2C_MUX_CONTROL ATPX function to339 * switch the i2c/hpd mux between the discrete GPU and integrated GPU340 * (all asics).341 * Returns 0 on success, error on failure.342 */343static int radeon_atpx_switch_i2c_mux(struct radeon_atpx *atpx, u16 mux_id)344{345 struct acpi_buffer params;346 union acpi_object *info;347 struct atpx_mux input;348 349 if (atpx->functions.i2c_mux_cntl) {350 input.size = 4;351 input.mux = mux_id;352 params.length = input.size;353 params.pointer = &input;354 info = radeon_atpx_call(atpx->handle,355 ATPX_FUNCTION_I2C_MUX_CONTROL,356 ¶ms);357 if (!info)358 return -EIO;359 kfree(info);360 }361 return 0;362}363 364/**365 * radeon_atpx_switch_start - notify the sbios of a GPU switch366 *367 * @atpx: atpx info struct368 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)369 *370 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION ATPX371 * function to notify the sbios that a switch between the discrete GPU and372 * integrated GPU has begun (all asics).373 * Returns 0 on success, error on failure.374 */375static int radeon_atpx_switch_start(struct radeon_atpx *atpx, u16 mux_id)376{377 struct acpi_buffer params;378 union acpi_object *info;379 struct atpx_mux input;380 381 if (atpx->functions.switch_start) {382 input.size = 4;383 input.mux = mux_id;384 params.length = input.size;385 params.pointer = &input;386 info = radeon_atpx_call(atpx->handle,387 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION,388 ¶ms);389 if (!info)390 return -EIO;391 kfree(info);392 }393 return 0;394}395 396/**397 * radeon_atpx_switch_end - notify the sbios of a GPU switch398 *399 * @atpx: atpx info struct400 * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)401 *402 * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION ATPX403 * function to notify the sbios that a switch between the discrete GPU and404 * integrated GPU has ended (all asics).405 * Returns 0 on success, error on failure.406 */407static int radeon_atpx_switch_end(struct radeon_atpx *atpx, u16 mux_id)408{409 struct acpi_buffer params;410 union acpi_object *info;411 struct atpx_mux input;412 413 if (atpx->functions.switch_end) {414 input.size = 4;415 input.mux = mux_id;416 params.length = input.size;417 params.pointer = &input;418 info = radeon_atpx_call(atpx->handle,419 ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION,420 ¶ms);421 if (!info)422 return -EIO;423 kfree(info);424 }425 return 0;426}427 428/**429 * radeon_atpx_switchto - switch to the requested GPU430 *431 * @id: GPU to switch to432 *433 * Execute the necessary ATPX functions to switch between the discrete GPU and434 * integrated GPU (all asics).435 * Returns 0 on success, error on failure.436 */437static int radeon_atpx_switchto(enum vga_switcheroo_client_id id)438{439 u16 gpu_id;440 441 if (id == VGA_SWITCHEROO_IGD)442 gpu_id = ATPX_INTEGRATED_GPU;443 else444 gpu_id = ATPX_DISCRETE_GPU;445 446 radeon_atpx_switch_start(&radeon_atpx_priv.atpx, gpu_id);447 radeon_atpx_switch_disp_mux(&radeon_atpx_priv.atpx, gpu_id);448 radeon_atpx_switch_i2c_mux(&radeon_atpx_priv.atpx, gpu_id);449 radeon_atpx_switch_end(&radeon_atpx_priv.atpx, gpu_id);450 451 return 0;452}453 454/**455 * radeon_atpx_power_state - power down/up the requested GPU456 *457 * @id: GPU to power down/up458 * @state: requested power state (0 = off, 1 = on)459 *460 * Execute the necessary ATPX function to power down/up the discrete GPU461 * (all asics).462 * Returns 0 on success, error on failure.463 */464static int radeon_atpx_power_state(enum vga_switcheroo_client_id id,465 enum vga_switcheroo_state state)466{467 /* on w500 ACPI can't change intel gpu state */468 if (id == VGA_SWITCHEROO_IGD)469 return 0;470 471 radeon_atpx_set_discrete_state(&radeon_atpx_priv.atpx, state);472 return 0;473}474 475/**476 * radeon_atpx_pci_probe_handle - look up the ATPX handle477 *478 * @pdev: pci device479 *480 * Look up the ATPX handles (all asics).481 * Returns true if the handles are found, false if not.482 */483static bool radeon_atpx_pci_probe_handle(struct pci_dev *pdev)484{485 acpi_handle dhandle, atpx_handle;486 acpi_status status;487 488 dhandle = ACPI_HANDLE(&pdev->dev);489 if (!dhandle)490 return false;491 492 status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);493 if (ACPI_FAILURE(status))494 return false;495 496 radeon_atpx_priv.dhandle = dhandle;497 radeon_atpx_priv.atpx.handle = atpx_handle;498 return true;499}500 501/**502 * radeon_atpx_init - verify the ATPX interface503 *504 * Verify the ATPX interface (all asics).505 * Returns 0 on success, error on failure.506 */507static int radeon_atpx_init(void)508{509 int r;510 511 /* set up the ATPX handle */512 r = radeon_atpx_verify_interface(&radeon_atpx_priv.atpx);513 if (r)514 return r;515 516 /* validate the atpx setup */517 r = radeon_atpx_validate(&radeon_atpx_priv.atpx);518 if (r)519 return r;520 521 return 0;522}523 524/**525 * radeon_atpx_get_client_id - get the client id526 *527 * @pdev: pci device528 *529 * look up whether we are the integrated or discrete GPU (all asics).530 * Returns the client id.531 */532static enum vga_switcheroo_client_id radeon_atpx_get_client_id(struct pci_dev *pdev)533{534 if (radeon_atpx_priv.dhandle == ACPI_HANDLE(&pdev->dev))535 return VGA_SWITCHEROO_IGD;536 else537 return VGA_SWITCHEROO_DIS;538}539 540static const struct vga_switcheroo_handler radeon_atpx_handler = {541 .switchto = radeon_atpx_switchto,542 .power_state = radeon_atpx_power_state,543 .get_client_id = radeon_atpx_get_client_id,544};545 546/**547 * radeon_atpx_detect - detect whether we have PX548 *549 * Check if we have a PX system (all asics).550 * Returns true if we have a PX system, false if not.551 */552static bool radeon_atpx_detect(void)553{554 char acpi_method_name[255] = { 0 };555 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};556 struct pci_dev *pdev = NULL;557 bool has_atpx = false;558 int vga_count = 0;559 bool d3_supported = false;560 struct pci_dev *parent_pdev;561 562 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {563 vga_count++;564 565 has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);566 567 parent_pdev = pci_upstream_bridge(pdev);568 d3_supported |= parent_pdev && parent_pdev->bridge_d3;569 }570 571 /* some newer PX laptops mark the dGPU as a non-VGA display device */572 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {573 vga_count++;574 575 has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);576 577 parent_pdev = pci_upstream_bridge(pdev);578 d3_supported |= parent_pdev && parent_pdev->bridge_d3;579 }580 581 if (has_atpx && vga_count == 2) {582 acpi_get_name(radeon_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer);583 pr_info("vga_switcheroo: detected switching method %s handle\n",584 acpi_method_name);585 radeon_atpx_priv.atpx_detected = true;586 radeon_atpx_priv.bridge_pm_usable = d3_supported;587 radeon_atpx_init();588 return true;589 }590 return false;591}592 593/**594 * radeon_register_atpx_handler - register with vga_switcheroo595 *596 * Register the PX callbacks with vga_switcheroo (all asics).597 */598void radeon_register_atpx_handler(void)599{600 bool r;601 enum vga_switcheroo_handler_flags_t handler_flags = 0;602 603 /* detect if we have any ATPX + 2 VGA in the system */604 r = radeon_atpx_detect();605 if (!r)606 return;607 608 vga_switcheroo_register_handler(&radeon_atpx_handler, handler_flags);609}610 611/**612 * radeon_unregister_atpx_handler - unregister with vga_switcheroo613 *614 * Unregister the PX callbacks with vga_switcheroo (all asics).615 */616void radeon_unregister_atpx_handler(void)617{618 vga_switcheroo_unregister_handler();619}620