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 char nouveau_dsm_muid[] = { 64 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D, 65 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4, 66 }; 67 68 static const char nouveau_op_dsm_muid[] = { 69 0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47, 70 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0, 71 }; 72 73 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result) 74 { 75 int i; 76 union acpi_object *obj; 77 char args_buff[4]; 78 union acpi_object argv4 = { 79 .buffer.type = ACPI_TYPE_BUFFER, 80 .buffer.length = 4, 81 .buffer.pointer = args_buff 82 }; 83 84 /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */ 85 for (i = 0; i < 4; i++) 86 args_buff[i] = (arg >> i * 8) & 0xFF; 87 88 *result = 0; 89 obj = acpi_evaluate_dsm_typed(handle, nouveau_op_dsm_muid, 0x00000100, 90 func, &argv4, ACPI_TYPE_BUFFER); 91 if (!obj) { 92 acpi_handle_info(handle, "failed to evaluate _DSM\n"); 93 return AE_ERROR; 94 } else { 95 if (obj->buffer.length == 4) { 96 *result |= obj->buffer.pointer[0]; 97 *result |= (obj->buffer.pointer[1] << 8); 98 *result |= (obj->buffer.pointer[2] << 16); 99 *result |= (obj->buffer.pointer[3] << 24); 100 } 101 ACPI_FREE(obj); 102 } 103 104 return 0; 105 } 106 107 /* 108 * On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special 109 * requirements on the fourth parameter, so a private implementation 110 * instead of using acpi_check_dsm(). 111 */ 112 static int nouveau_dsm_get_optimus_functions(acpi_handle handle) 113 { 114 int result; 115 116 /* 117 * Function 0 returns a Buffer containing available functions. 118 * The args parameter is ignored for function 0, so just put 0 in it 119 */ 120 if (nouveau_optimus_dsm(handle, 0, 0, &result)) 121 return 0; 122 123 /* 124 * ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. 125 * If the n-th bit is enabled, function n is supported 126 */ 127 if (result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS)) 128 return result; 129 return 0; 130 } 131 132 static int nouveau_dsm(acpi_handle handle, int func, int arg) 133 { 134 int ret = 0; 135 union acpi_object *obj; 136 union acpi_object argv4 = { 137 .integer.type = ACPI_TYPE_INTEGER, 138 .integer.value = arg, 139 }; 140 141 obj = acpi_evaluate_dsm_typed(handle, nouveau_dsm_muid, 0x00000102, 142 func, &argv4, ACPI_TYPE_INTEGER); 143 if (!obj) { 144 acpi_handle_info(handle, "failed to evaluate _DSM\n"); 145 return AE_ERROR; 146 } else { 147 if (obj->integer.value == 0x80000002) 148 ret = -ENODEV; 149 ACPI_FREE(obj); 150 } 151 152 return ret; 153 } 154 155 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id) 156 { 157 mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0); 158 mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0); 159 return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id); 160 } 161 162 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state) 163 { 164 int arg; 165 if (state == VGA_SWITCHEROO_ON) 166 arg = NOUVEAU_DSM_POWER_SPEED; 167 else 168 arg = NOUVEAU_DSM_POWER_STAMINA; 169 nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg); 170 return 0; 171 } 172 173 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id) 174 { 175 if (!nouveau_dsm_priv.dsm_detected) 176 return 0; 177 if (id == VGA_SWITCHEROO_IGD) 178 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA); 179 else 180 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED); 181 } 182 183 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id, 184 enum vga_switcheroo_state state) 185 { 186 if (id == VGA_SWITCHEROO_IGD) 187 return 0; 188 189 /* Optimus laptops have the card already disabled in 190 * nouveau_switcheroo_set_state */ 191 if (!nouveau_dsm_priv.dsm_detected) 192 return 0; 193 194 return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state); 195 } 196 197 static int nouveau_dsm_get_client_id(struct pci_dev *pdev) 198 { 199 /* easy option one - intel vendor ID means Integrated */ 200 if (pdev->vendor == PCI_VENDOR_ID_INTEL) 201 return VGA_SWITCHEROO_IGD; 202 203 /* is this device on Bus 0? - this may need improving */ 204 if (pdev->bus->number == 0) 205 return VGA_SWITCHEROO_IGD; 206 207 return VGA_SWITCHEROO_DIS; 208 } 209 210 static const struct vga_switcheroo_handler nouveau_dsm_handler = { 211 .switchto = nouveau_dsm_switchto, 212 .power_state = nouveau_dsm_power_state, 213 .get_client_id = nouveau_dsm_get_client_id, 214 }; 215 216 /* 217 * Firmware supporting Windows 8 or later do not use _DSM to put the device into 218 * D3cold, they instead rely on disabling power resources on the parent. 219 */ 220 static bool nouveau_pr3_present(struct pci_dev *pdev) 221 { 222 struct pci_dev *parent_pdev = pci_upstream_bridge(pdev); 223 struct acpi_device *parent_adev; 224 225 if (!parent_pdev) 226 return false; 227 228 parent_adev = ACPI_COMPANION(&parent_pdev->dev); 229 if (!parent_adev) 230 return false; 231 232 return acpi_has_method(parent_adev->handle, "_PR3"); 233 } 234 235 static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out, 236 bool *has_mux, bool *has_opt, 237 bool *has_opt_flags, bool *has_pr3) 238 { 239 acpi_handle dhandle; 240 bool supports_mux; 241 int optimus_funcs; 242 243 dhandle = ACPI_HANDLE(&pdev->dev); 244 if (!dhandle) 245 return; 246 247 if (!acpi_has_method(dhandle, "_DSM")) 248 return; 249 250 supports_mux = acpi_check_dsm(dhandle, nouveau_dsm_muid, 0x00000102, 251 1 << NOUVEAU_DSM_POWER); 252 optimus_funcs = nouveau_dsm_get_optimus_functions(dhandle); 253 254 /* Does not look like a Nvidia device. */ 255 if (!supports_mux && !optimus_funcs) 256 return; 257 258 *dhandle_out = dhandle; 259 *has_mux = supports_mux; 260 *has_opt = !!optimus_funcs; 261 *has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS); 262 *has_pr3 = false; 263 264 if (optimus_funcs) { 265 uint32_t result; 266 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0, 267 &result); 268 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n", 269 (result & OPTIMUS_ENABLED) ? "enabled" : "disabled", 270 (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "", 271 (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : ""); 272 273 *has_pr3 = nouveau_pr3_present(pdev); 274 } 275 } 276 277 static bool nouveau_dsm_detect(void) 278 { 279 char acpi_method_name[255] = { 0 }; 280 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; 281 struct pci_dev *pdev = NULL; 282 acpi_handle dhandle = NULL; 283 bool has_mux = false; 284 bool has_optimus = false; 285 bool has_optimus_flags = false; 286 bool has_power_resources = false; 287 int vga_count = 0; 288 bool guid_valid; 289 bool ret = false; 290 291 /* lookup the MXM GUID */ 292 guid_valid = mxm_wmi_supported(); 293 294 if (guid_valid) 295 printk("MXM: GUID detected in BIOS\n"); 296 297 /* now do DSM detection */ 298 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { 299 vga_count++; 300 301 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus, 302 &has_optimus_flags, &has_power_resources); 303 } 304 305 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) { 306 vga_count++; 307 308 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus, 309 &has_optimus_flags, &has_power_resources); 310 } 311 312 /* find the optimus DSM or the old v1 DSM */ 313 if (has_optimus) { 314 nouveau_dsm_priv.dhandle = dhandle; 315 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, 316 &buffer); 317 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n", 318 acpi_method_name); 319 if (has_power_resources) 320 pr_info("nouveau: detected PR support, will not use DSM\n"); 321 nouveau_dsm_priv.optimus_detected = true; 322 nouveau_dsm_priv.optimus_flags_detected = has_optimus_flags; 323 nouveau_dsm_priv.optimus_skip_dsm = has_power_resources; 324 ret = true; 325 } else if (vga_count == 2 && has_mux && guid_valid) { 326 nouveau_dsm_priv.dhandle = dhandle; 327 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, 328 &buffer); 329 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n", 330 acpi_method_name); 331 nouveau_dsm_priv.dsm_detected = true; 332 ret = true; 333 } 334 335 336 return ret; 337 } 338 339 void nouveau_register_dsm_handler(void) 340 { 341 bool r; 342 343 r = nouveau_dsm_detect(); 344 if (!r) 345 return; 346 347 vga_switcheroo_register_handler(&nouveau_dsm_handler, 0); 348 } 349 350 /* Must be called for Optimus models before the card can be turned off */ 351 void nouveau_switcheroo_optimus_dsm(void) 352 { 353 u32 result = 0; 354 if (!nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.optimus_skip_dsm) 355 return; 356 357 if (nouveau_dsm_priv.optimus_flags_detected) 358 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS, 359 0x3, &result); 360 361 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 362 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result); 363 364 } 365 366 void nouveau_unregister_dsm_handler(void) 367 { 368 if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected) 369 vga_switcheroo_unregister_handler(); 370 } 371 #else 372 void nouveau_register_dsm_handler(void) {} 373 void nouveau_unregister_dsm_handler(void) {} 374 void nouveau_switcheroo_optimus_dsm(void) {} 375 #endif 376 377 /* retrieve the ROM in 4k blocks */ 378 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios, 379 int offset, int len) 380 { 381 acpi_status status; 382 union acpi_object rom_arg_elements[2], *obj; 383 struct acpi_object_list rom_arg; 384 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL}; 385 386 rom_arg.count = 2; 387 rom_arg.pointer = &rom_arg_elements[0]; 388 389 rom_arg_elements[0].type = ACPI_TYPE_INTEGER; 390 rom_arg_elements[0].integer.value = offset; 391 392 rom_arg_elements[1].type = ACPI_TYPE_INTEGER; 393 rom_arg_elements[1].integer.value = len; 394 395 status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer); 396 if (ACPI_FAILURE(status)) { 397 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status)); 398 return -ENODEV; 399 } 400 obj = (union acpi_object *)buffer.pointer; 401 len = min(len, (int)obj->buffer.length); 402 memcpy(bios+offset, obj->buffer.pointer, len); 403 kfree(buffer.pointer); 404 return len; 405 } 406 407 bool nouveau_acpi_rom_supported(struct device *dev) 408 { 409 acpi_status status; 410 acpi_handle dhandle, rom_handle; 411 412 dhandle = ACPI_HANDLE(dev); 413 if (!dhandle) 414 return false; 415 416 status = acpi_get_handle(dhandle, "_ROM", &rom_handle); 417 if (ACPI_FAILURE(status)) 418 return false; 419 420 nouveau_dsm_priv.rom_handle = rom_handle; 421 return true; 422 } 423 424 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len) 425 { 426 return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len); 427 } 428 429 void * 430 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector) 431 { 432 struct acpi_device *acpidev; 433 acpi_handle handle; 434 int type, ret; 435 void *edid; 436 437 switch (connector->connector_type) { 438 case DRM_MODE_CONNECTOR_LVDS: 439 case DRM_MODE_CONNECTOR_eDP: 440 type = ACPI_VIDEO_DISPLAY_LCD; 441 break; 442 default: 443 return NULL; 444 } 445 446 handle = ACPI_HANDLE(&dev->pdev->dev); 447 if (!handle) 448 return NULL; 449 450 ret = acpi_bus_get_device(handle, &acpidev); 451 if (ret) 452 return NULL; 453 454 ret = acpi_video_get_edid(acpidev, type, -1, &edid); 455 if (ret < 0) 456 return NULL; 457 458 return kmemdup(edid, EDID_LENGTH, GFP_KERNEL); 459 } 460