1 #include <linux/pci.h> 2 #include <linux/acpi.h> 3 #include <linux/slab.h> 4 #include <linux/mxm-wmi.h> 5 #include <linux/vga_switcheroo.h> 6 #include <drm/drm_edid.h> 7 #include <acpi/video.h> 8 9 #include "nouveau_drv.h" 10 #include "nouveau_acpi.h" 11 12 #define NOUVEAU_DSM_LED 0x02 13 #define NOUVEAU_DSM_LED_STATE 0x00 14 #define NOUVEAU_DSM_LED_OFF 0x10 15 #define NOUVEAU_DSM_LED_STAMINA 0x11 16 #define NOUVEAU_DSM_LED_SPEED 0x12 17 18 #define NOUVEAU_DSM_POWER 0x03 19 #define NOUVEAU_DSM_POWER_STATE 0x00 20 #define NOUVEAU_DSM_POWER_SPEED 0x01 21 #define NOUVEAU_DSM_POWER_STAMINA 0x02 22 23 #define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A 24 #define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B 25 26 #define NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 (3 << 24) 27 #define NOUVEAU_DSM_OPTIMUS_NO_POWERDOWN_PS3 (2 << 24) 28 #define NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED (1) 29 30 #define NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN (NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 | NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED) 31 32 /* result of the optimus caps function */ 33 #define OPTIMUS_ENABLED (1 << 0) 34 #define OPTIMUS_STATUS_MASK (3 << 3) 35 #define OPTIMUS_STATUS_OFF (0 << 3) 36 #define OPTIMUS_STATUS_ON_ENABLED (1 << 3) 37 #define OPTIMUS_STATUS_PWR_STABLE (3 << 3) 38 #define OPTIMUS_DISPLAY_HOTPLUG (1 << 6) 39 #define OPTIMUS_CAPS_MASK (7 << 24) 40 #define OPTIMUS_DYNAMIC_PWR_CAP (1 << 24) 41 42 #define OPTIMUS_AUDIO_CAPS_MASK (3 << 27) 43 #define OPTIMUS_HDA_CODEC_MASK (2 << 27) /* hda bios control */ 44 45 static struct nouveau_dsm_priv { 46 bool dsm_detected; 47 bool optimus_detected; 48 bool optimus_flags_detected; 49 bool optimus_skip_dsm; 50 acpi_handle dhandle; 51 acpi_handle rom_handle; 52 } nouveau_dsm_priv; 53 54 bool nouveau_is_optimus(void) { 55 return nouveau_dsm_priv.optimus_detected; 56 } 57 58 bool nouveau_is_v1_dsm(void) { 59 return nouveau_dsm_priv.dsm_detected; 60 } 61 62 #ifdef CONFIG_VGA_SWITCHEROO 63 static const guid_t nouveau_dsm_muid = 64 GUID_INIT(0x9D95A0A0, 0x0060, 0x4D48, 65 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4); 66 67 static const guid_t nouveau_op_dsm_muid = 68 GUID_INIT(0xA486D8F8, 0x0BDA, 0x471B, 69 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0); 70 71 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result) 72 { 73 int i; 74 union acpi_object *obj; 75 char args_buff[4]; 76 union acpi_object argv4 = { 77 .buffer.type = ACPI_TYPE_BUFFER, 78 .buffer.length = 4, 79 .buffer.pointer = args_buff 80 }; 81 82 /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */ 83 for (i = 0; i < 4; i++) 84 args_buff[i] = (arg >> i * 8) & 0xFF; 85 86 *result = 0; 87 obj = acpi_evaluate_dsm_typed(handle, &nouveau_op_dsm_muid, 0x00000100, 88 func, &argv4, ACPI_TYPE_BUFFER); 89 if (!obj) { 90 acpi_handle_info(handle, "failed to evaluate _DSM\n"); 91 return AE_ERROR; 92 } else { 93 if (obj->buffer.length == 4) { 94 *result |= obj->buffer.pointer[0]; 95 *result |= (obj->buffer.pointer[1] << 8); 96 *result |= (obj->buffer.pointer[2] << 16); 97 *result |= (obj->buffer.pointer[3] << 24); 98 } 99 ACPI_FREE(obj); 100 } 101 102 return 0; 103 } 104 105 /* 106 * On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special 107 * requirements on the fourth parameter, so a private implementation 108 * instead of using acpi_check_dsm(). 109 */ 110 static int nouveau_dsm_get_optimus_functions(acpi_handle handle) 111 { 112 int result; 113 114 /* 115 * Function 0 returns a Buffer containing available functions. 116 * The args parameter is ignored for function 0, so just put 0 in it 117 */ 118 if (nouveau_optimus_dsm(handle, 0, 0, &result)) 119 return 0; 120 121 /* 122 * ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. 123 * If the n-th bit is enabled, function n is supported 124 */ 125 if (result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS)) 126 return result; 127 return 0; 128 } 129 130 static int nouveau_dsm(acpi_handle handle, int func, int arg) 131 { 132 int ret = 0; 133 union acpi_object *obj; 134 union acpi_object argv4 = { 135 .integer.type = ACPI_TYPE_INTEGER, 136 .integer.value = arg, 137 }; 138 139 obj = acpi_evaluate_dsm_typed(handle, &nouveau_dsm_muid, 0x00000102, 140 func, &argv4, ACPI_TYPE_INTEGER); 141 if (!obj) { 142 acpi_handle_info(handle, "failed to evaluate _DSM\n"); 143 return AE_ERROR; 144 } else { 145 if (obj->integer.value == 0x80000002) 146 ret = -ENODEV; 147 ACPI_FREE(obj); 148 } 149 150 return ret; 151 } 152 153 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id) 154 { 155 mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0); 156 mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0); 157 return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id); 158 } 159 160 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state) 161 { 162 int arg; 163 if (state == VGA_SWITCHEROO_ON) 164 arg = NOUVEAU_DSM_POWER_SPEED; 165 else 166 arg = NOUVEAU_DSM_POWER_STAMINA; 167 nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg); 168 return 0; 169 } 170 171 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id) 172 { 173 if (!nouveau_dsm_priv.dsm_detected) 174 return 0; 175 if (id == VGA_SWITCHEROO_IGD) 176 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA); 177 else 178 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED); 179 } 180 181 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id, 182 enum vga_switcheroo_state state) 183 { 184 if (id == VGA_SWITCHEROO_IGD) 185 return 0; 186 187 /* Optimus laptops have the card already disabled in 188 * nouveau_switcheroo_set_state */ 189 if (!nouveau_dsm_priv.dsm_detected) 190 return 0; 191 192 return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state); 193 } 194 195 static int nouveau_dsm_get_client_id(struct pci_dev *pdev) 196 { 197 /* easy option one - intel vendor ID means Integrated */ 198 if (pdev->vendor == PCI_VENDOR_ID_INTEL) 199 return VGA_SWITCHEROO_IGD; 200 201 /* is this device on Bus 0? - this may need improving */ 202 if (pdev->bus->number == 0) 203 return VGA_SWITCHEROO_IGD; 204 205 return VGA_SWITCHEROO_DIS; 206 } 207 208 static const struct vga_switcheroo_handler nouveau_dsm_handler = { 209 .switchto = nouveau_dsm_switchto, 210 .power_state = nouveau_dsm_power_state, 211 .get_client_id = nouveau_dsm_get_client_id, 212 }; 213 214 /* 215 * Firmware supporting Windows 8 or later do not use _DSM to put the device into 216 * D3cold, they instead rely on disabling power resources on the parent. 217 */ 218 static bool nouveau_pr3_present(struct pci_dev *pdev) 219 { 220 struct pci_dev *parent_pdev = pci_upstream_bridge(pdev); 221 struct acpi_device *parent_adev; 222 223 if (!parent_pdev) 224 return false; 225 226 if (!parent_pdev->bridge_d3) { 227 /* 228 * Parent PCI bridge is currently not power managed. 229 * Since userspace can change these afterwards to be on 230 * the safe side we stick with _DSM and prevent usage of 231 * _PR3 from the bridge. 232 */ 233 pci_d3cold_disable(pdev); 234 return false; 235 } 236 237 parent_adev = ACPI_COMPANION(&parent_pdev->dev); 238 if (!parent_adev) 239 return false; 240 241 return parent_adev->power.flags.power_resources && 242 acpi_has_method(parent_adev->handle, "_PR3"); 243 } 244 245 static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out, 246 bool *has_mux, bool *has_opt, 247 bool *has_opt_flags, bool *has_pr3) 248 { 249 acpi_handle dhandle; 250 bool supports_mux; 251 int optimus_funcs; 252 253 dhandle = ACPI_HANDLE(&pdev->dev); 254 if (!dhandle) 255 return; 256 257 if (!acpi_has_method(dhandle, "_DSM")) 258 return; 259 260 supports_mux = acpi_check_dsm(dhandle, &nouveau_dsm_muid, 0x00000102, 261 1 << NOUVEAU_DSM_POWER); 262 optimus_funcs = nouveau_dsm_get_optimus_functions(dhandle); 263 264 /* Does not look like a Nvidia device. */ 265 if (!supports_mux && !optimus_funcs) 266 return; 267 268 *dhandle_out = dhandle; 269 *has_mux = supports_mux; 270 *has_opt = !!optimus_funcs; 271 *has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS); 272 *has_pr3 = false; 273 274 if (optimus_funcs) { 275 uint32_t result; 276 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0, 277 &result); 278 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n", 279 (result & OPTIMUS_ENABLED) ? "enabled" : "disabled", 280 (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "", 281 (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : ""); 282 283 *has_pr3 = nouveau_pr3_present(pdev); 284 } 285 } 286 287 static bool nouveau_dsm_detect(void) 288 { 289 char acpi_method_name[255] = { 0 }; 290 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; 291 struct pci_dev *pdev = NULL; 292 acpi_handle dhandle = NULL; 293 bool has_mux = false; 294 bool has_optimus = false; 295 bool has_optimus_flags = false; 296 bool has_power_resources = false; 297 int vga_count = 0; 298 bool guid_valid; 299 bool ret = false; 300 301 /* lookup the MXM GUID */ 302 guid_valid = mxm_wmi_supported(); 303 304 if (guid_valid) 305 printk("MXM: GUID detected in BIOS\n"); 306 307 /* now do DSM detection */ 308 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { 309 vga_count++; 310 311 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus, 312 &has_optimus_flags, &has_power_resources); 313 } 314 315 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) { 316 vga_count++; 317 318 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus, 319 &has_optimus_flags, &has_power_resources); 320 } 321 322 /* find the optimus DSM or the old v1 DSM */ 323 if (has_optimus) { 324 nouveau_dsm_priv.dhandle = dhandle; 325 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, 326 &buffer); 327 pr_info("VGA switcheroo: detected Optimus DSM method %s handle\n", 328 acpi_method_name); 329 if (has_power_resources) 330 pr_info("nouveau: detected PR support, will not use DSM\n"); 331 nouveau_dsm_priv.optimus_detected = true; 332 nouveau_dsm_priv.optimus_flags_detected = has_optimus_flags; 333 nouveau_dsm_priv.optimus_skip_dsm = has_power_resources; 334 ret = true; 335 } else if (vga_count == 2 && has_mux && guid_valid) { 336 nouveau_dsm_priv.dhandle = dhandle; 337 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, 338 &buffer); 339 pr_info("VGA switcheroo: detected DSM switching method %s handle\n", 340 acpi_method_name); 341 nouveau_dsm_priv.dsm_detected = true; 342 ret = true; 343 } 344 345 346 return ret; 347 } 348 349 void nouveau_register_dsm_handler(void) 350 { 351 bool r; 352 353 r = nouveau_dsm_detect(); 354 if (!r) 355 return; 356 357 vga_switcheroo_register_handler(&nouveau_dsm_handler, 0); 358 } 359 360 /* Must be called for Optimus models before the card can be turned off */ 361 void nouveau_switcheroo_optimus_dsm(void) 362 { 363 u32 result = 0; 364 if (!nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.optimus_skip_dsm) 365 return; 366 367 if (nouveau_dsm_priv.optimus_flags_detected) 368 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS, 369 0x3, &result); 370 371 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 372 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result); 373 374 } 375 376 void nouveau_unregister_dsm_handler(void) 377 { 378 if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected) 379 vga_switcheroo_unregister_handler(); 380 } 381 #else 382 void nouveau_register_dsm_handler(void) {} 383 void nouveau_unregister_dsm_handler(void) {} 384 void nouveau_switcheroo_optimus_dsm(void) {} 385 #endif 386 387 /* retrieve the ROM in 4k blocks */ 388 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios, 389 int offset, int len) 390 { 391 acpi_status status; 392 union acpi_object rom_arg_elements[2], *obj; 393 struct acpi_object_list rom_arg; 394 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL}; 395 396 rom_arg.count = 2; 397 rom_arg.pointer = &rom_arg_elements[0]; 398 399 rom_arg_elements[0].type = ACPI_TYPE_INTEGER; 400 rom_arg_elements[0].integer.value = offset; 401 402 rom_arg_elements[1].type = ACPI_TYPE_INTEGER; 403 rom_arg_elements[1].integer.value = len; 404 405 status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer); 406 if (ACPI_FAILURE(status)) { 407 pr_info("failed to evaluate ROM got %s\n", 408 acpi_format_exception(status)); 409 return -ENODEV; 410 } 411 obj = (union acpi_object *)buffer.pointer; 412 len = min(len, (int)obj->buffer.length); 413 memcpy(bios+offset, obj->buffer.pointer, len); 414 kfree(buffer.pointer); 415 return len; 416 } 417 418 bool nouveau_acpi_rom_supported(struct device *dev) 419 { 420 acpi_status status; 421 acpi_handle dhandle, rom_handle; 422 423 dhandle = ACPI_HANDLE(dev); 424 if (!dhandle) 425 return false; 426 427 status = acpi_get_handle(dhandle, "_ROM", &rom_handle); 428 if (ACPI_FAILURE(status)) 429 return false; 430 431 nouveau_dsm_priv.rom_handle = rom_handle; 432 return true; 433 } 434 435 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len) 436 { 437 return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len); 438 } 439 440 void * 441 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector) 442 { 443 struct acpi_device *acpidev; 444 acpi_handle handle; 445 int type, ret; 446 void *edid; 447 448 switch (connector->connector_type) { 449 case DRM_MODE_CONNECTOR_LVDS: 450 case DRM_MODE_CONNECTOR_eDP: 451 type = ACPI_VIDEO_DISPLAY_LCD; 452 break; 453 default: 454 return NULL; 455 } 456 457 handle = ACPI_HANDLE(&dev->pdev->dev); 458 if (!handle) 459 return NULL; 460 461 ret = acpi_bus_get_device(handle, &acpidev); 462 if (ret) 463 return NULL; 464 465 ret = acpi_video_get_edid(acpidev, type, -1, &edid); 466 if (ret < 0) 467 return NULL; 468 469 return kmemdup(edid, EDID_LENGTH, GFP_KERNEL); 470 } 471