1 #include <linux/pci.h> 2 #include <linux/acpi.h> 3 #include <linux/slab.h> 4 #include <acpi/acpi_drivers.h> 5 #include <acpi/acpi_bus.h> 6 #include <acpi/video.h> 7 #include <acpi/acpi.h> 8 #include <linux/mxm-wmi.h> 9 10 #include <linux/vga_switcheroo.h> 11 12 #include <drm/drm_edid.h> 13 14 #include "nouveau_drm.h" 15 #include "nouveau_acpi.h" 16 17 #define NOUVEAU_DSM_LED 0x02 18 #define NOUVEAU_DSM_LED_STATE 0x00 19 #define NOUVEAU_DSM_LED_OFF 0x10 20 #define NOUVEAU_DSM_LED_STAMINA 0x11 21 #define NOUVEAU_DSM_LED_SPEED 0x12 22 23 #define NOUVEAU_DSM_POWER 0x03 24 #define NOUVEAU_DSM_POWER_STATE 0x00 25 #define NOUVEAU_DSM_POWER_SPEED 0x01 26 #define NOUVEAU_DSM_POWER_STAMINA 0x02 27 28 #define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A 29 #define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B 30 31 #define NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 (3 << 24) 32 #define NOUVEAU_DSM_OPTIMUS_NO_POWERDOWN_PS3 (2 << 24) 33 #define NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED (1) 34 35 #define NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN (NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 | NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED) 36 37 /* result of the optimus caps function */ 38 #define OPTIMUS_ENABLED (1 << 0) 39 #define OPTIMUS_STATUS_MASK (3 << 3) 40 #define OPTIMUS_STATUS_OFF (0 << 3) 41 #define OPTIMUS_STATUS_ON_ENABLED (1 << 3) 42 #define OPTIMUS_STATUS_PWR_STABLE (3 << 3) 43 #define OPTIMUS_DISPLAY_HOTPLUG (1 << 6) 44 #define OPTIMUS_CAPS_MASK (7 << 24) 45 #define OPTIMUS_DYNAMIC_PWR_CAP (1 << 24) 46 47 #define OPTIMUS_AUDIO_CAPS_MASK (3 << 27) 48 #define OPTIMUS_HDA_CODEC_MASK (2 << 27) /* hda bios control */ 49 50 static struct nouveau_dsm_priv { 51 bool dsm_detected; 52 bool optimus_detected; 53 acpi_handle dhandle; 54 acpi_handle other_handle; 55 acpi_handle rom_handle; 56 } nouveau_dsm_priv; 57 58 bool nouveau_is_optimus(void) { 59 return nouveau_dsm_priv.optimus_detected; 60 } 61 62 bool nouveau_is_v1_dsm(void) { 63 return nouveau_dsm_priv.dsm_detected; 64 } 65 66 #define NOUVEAU_DSM_HAS_MUX 0x1 67 #define NOUVEAU_DSM_HAS_OPT 0x2 68 69 static const char nouveau_dsm_muid[] = { 70 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D, 71 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4, 72 }; 73 74 static const char nouveau_op_dsm_muid[] = { 75 0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47, 76 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0, 77 }; 78 79 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result) 80 { 81 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; 82 struct acpi_object_list input; 83 union acpi_object params[4]; 84 union acpi_object *obj; 85 int i, err; 86 char args_buff[4]; 87 88 input.count = 4; 89 input.pointer = params; 90 params[0].type = ACPI_TYPE_BUFFER; 91 params[0].buffer.length = sizeof(nouveau_op_dsm_muid); 92 params[0].buffer.pointer = (char *)nouveau_op_dsm_muid; 93 params[1].type = ACPI_TYPE_INTEGER; 94 params[1].integer.value = 0x00000100; 95 params[2].type = ACPI_TYPE_INTEGER; 96 params[2].integer.value = func; 97 params[3].type = ACPI_TYPE_BUFFER; 98 params[3].buffer.length = 4; 99 /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */ 100 for (i = 0; i < 4; i++) 101 args_buff[i] = (arg >> i * 8) & 0xFF; 102 params[3].buffer.pointer = args_buff; 103 104 err = acpi_evaluate_object(handle, "_DSM", &input, &output); 105 if (err) { 106 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err); 107 return err; 108 } 109 110 obj = (union acpi_object *)output.pointer; 111 112 if (obj->type == ACPI_TYPE_INTEGER) 113 if (obj->integer.value == 0x80000002) { 114 return -ENODEV; 115 } 116 117 if (obj->type == ACPI_TYPE_BUFFER) { 118 if (obj->buffer.length == 4 && result) { 119 *result = 0; 120 *result |= obj->buffer.pointer[0]; 121 *result |= (obj->buffer.pointer[1] << 8); 122 *result |= (obj->buffer.pointer[2] << 16); 123 *result |= (obj->buffer.pointer[3] << 24); 124 } 125 } 126 127 kfree(output.pointer); 128 return 0; 129 } 130 131 static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result) 132 { 133 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; 134 struct acpi_object_list input; 135 union acpi_object params[4]; 136 union acpi_object *obj; 137 int err; 138 139 input.count = 4; 140 input.pointer = params; 141 params[0].type = ACPI_TYPE_BUFFER; 142 params[0].buffer.length = sizeof(nouveau_dsm_muid); 143 params[0].buffer.pointer = (char *)nouveau_dsm_muid; 144 params[1].type = ACPI_TYPE_INTEGER; 145 params[1].integer.value = 0x00000102; 146 params[2].type = ACPI_TYPE_INTEGER; 147 params[2].integer.value = func; 148 params[3].type = ACPI_TYPE_INTEGER; 149 params[3].integer.value = arg; 150 151 err = acpi_evaluate_object(handle, "_DSM", &input, &output); 152 if (err) { 153 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err); 154 return err; 155 } 156 157 obj = (union acpi_object *)output.pointer; 158 159 if (obj->type == ACPI_TYPE_INTEGER) 160 if (obj->integer.value == 0x80000002) 161 return -ENODEV; 162 163 if (obj->type == ACPI_TYPE_BUFFER) { 164 if (obj->buffer.length == 4 && result) { 165 *result = 0; 166 *result |= obj->buffer.pointer[0]; 167 *result |= (obj->buffer.pointer[1] << 8); 168 *result |= (obj->buffer.pointer[2] << 16); 169 *result |= (obj->buffer.pointer[3] << 24); 170 } 171 } 172 173 kfree(output.pointer); 174 return 0; 175 } 176 177 /* Returns 1 if a DSM function is usable and 0 otherwise */ 178 static int nouveau_test_dsm(acpi_handle test_handle, 179 int (*dsm_func)(acpi_handle, int, int, uint32_t *), 180 int sfnc) 181 { 182 u32 result = 0; 183 184 /* Function 0 returns a Buffer containing available functions. The args 185 * parameter is ignored for function 0, so just put 0 in it */ 186 if (dsm_func(test_handle, 0, 0, &result)) 187 return 0; 188 189 /* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If 190 * the n-th bit is enabled, function n is supported */ 191 return result & 1 && result & (1 << sfnc); 192 } 193 194 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id) 195 { 196 mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0); 197 mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0); 198 return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL); 199 } 200 201 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state) 202 { 203 int arg; 204 if (state == VGA_SWITCHEROO_ON) 205 arg = NOUVEAU_DSM_POWER_SPEED; 206 else 207 arg = NOUVEAU_DSM_POWER_STAMINA; 208 nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL); 209 return 0; 210 } 211 212 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id) 213 { 214 if (!nouveau_dsm_priv.dsm_detected) 215 return 0; 216 if (id == VGA_SWITCHEROO_IGD) 217 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA); 218 else 219 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED); 220 } 221 222 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id, 223 enum vga_switcheroo_state state) 224 { 225 if (id == VGA_SWITCHEROO_IGD) 226 return 0; 227 228 /* Optimus laptops have the card already disabled in 229 * nouveau_switcheroo_set_state */ 230 if (!nouveau_dsm_priv.dsm_detected) 231 return 0; 232 233 return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state); 234 } 235 236 static int nouveau_dsm_get_client_id(struct pci_dev *pdev) 237 { 238 /* easy option one - intel vendor ID means Integrated */ 239 if (pdev->vendor == PCI_VENDOR_ID_INTEL) 240 return VGA_SWITCHEROO_IGD; 241 242 /* is this device on Bus 0? - this may need improving */ 243 if (pdev->bus->number == 0) 244 return VGA_SWITCHEROO_IGD; 245 246 return VGA_SWITCHEROO_DIS; 247 } 248 249 static struct vga_switcheroo_handler nouveau_dsm_handler = { 250 .switchto = nouveau_dsm_switchto, 251 .power_state = nouveau_dsm_power_state, 252 .get_client_id = nouveau_dsm_get_client_id, 253 }; 254 255 static int nouveau_dsm_pci_probe(struct pci_dev *pdev) 256 { 257 acpi_handle dhandle; 258 int retval = 0; 259 260 dhandle = ACPI_HANDLE(&pdev->dev); 261 if (!dhandle) 262 return false; 263 264 if (!acpi_has_method(dhandle, "_DSM")) { 265 nouveau_dsm_priv.other_handle = dhandle; 266 return false; 267 } 268 if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER)) 269 retval |= NOUVEAU_DSM_HAS_MUX; 270 271 if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm, 272 NOUVEAU_DSM_OPTIMUS_CAPS)) 273 retval |= NOUVEAU_DSM_HAS_OPT; 274 275 if (retval & NOUVEAU_DSM_HAS_OPT) { 276 uint32_t result; 277 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0, 278 &result); 279 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n", 280 (result & OPTIMUS_ENABLED) ? "enabled" : "disabled", 281 (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "", 282 (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : ""); 283 } 284 if (retval) 285 nouveau_dsm_priv.dhandle = dhandle; 286 287 return retval; 288 } 289 290 static bool nouveau_dsm_detect(void) 291 { 292 char acpi_method_name[255] = { 0 }; 293 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; 294 struct pci_dev *pdev = NULL; 295 int has_dsm = 0; 296 int has_optimus = 0; 297 int vga_count = 0; 298 bool guid_valid; 299 int retval; 300 bool ret = false; 301 302 /* lookup the MXM GUID */ 303 guid_valid = mxm_wmi_supported(); 304 305 if (guid_valid) 306 printk("MXM: GUID detected in BIOS\n"); 307 308 /* now do DSM detection */ 309 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { 310 vga_count++; 311 312 retval = nouveau_dsm_pci_probe(pdev); 313 if (retval & NOUVEAU_DSM_HAS_MUX) 314 has_dsm |= 1; 315 if (retval & NOUVEAU_DSM_HAS_OPT) 316 has_optimus = 1; 317 } 318 319 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) { 320 vga_count++; 321 322 retval = nouveau_dsm_pci_probe(pdev); 323 if (retval & NOUVEAU_DSM_HAS_MUX) 324 has_dsm |= 1; 325 if (retval & NOUVEAU_DSM_HAS_OPT) 326 has_optimus = 1; 327 } 328 329 /* find the optimus DSM or the old v1 DSM */ 330 if (has_optimus == 1) { 331 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, 332 &buffer); 333 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n", 334 acpi_method_name); 335 nouveau_dsm_priv.optimus_detected = true; 336 ret = true; 337 } else if (vga_count == 2 && has_dsm && guid_valid) { 338 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, 339 &buffer); 340 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n", 341 acpi_method_name); 342 nouveau_dsm_priv.dsm_detected = true; 343 /* 344 * On some systems hotplug events are generated for the device 345 * being switched off when _DSM is executed. They cause ACPI 346 * hotplug to trigger and attempt to remove the device from 347 * the system, which causes it to break down. Prevent that from 348 * happening by setting the no_hotplug flag for the involved 349 * ACPI device objects. 350 */ 351 acpi_bus_no_hotplug(nouveau_dsm_priv.dhandle); 352 acpi_bus_no_hotplug(nouveau_dsm_priv.other_handle); 353 ret = true; 354 } 355 356 357 return ret; 358 } 359 360 void nouveau_register_dsm_handler(void) 361 { 362 bool r; 363 364 r = nouveau_dsm_detect(); 365 if (!r) 366 return; 367 368 vga_switcheroo_register_handler(&nouveau_dsm_handler); 369 } 370 371 /* Must be called for Optimus models before the card can be turned off */ 372 void nouveau_switcheroo_optimus_dsm(void) 373 { 374 u32 result = 0; 375 if (!nouveau_dsm_priv.optimus_detected) 376 return; 377 378 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS, 379 0x3, &result); 380 381 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 382 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result); 383 384 } 385 386 void nouveau_unregister_dsm_handler(void) 387 { 388 if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected) 389 vga_switcheroo_unregister_handler(); 390 } 391 392 /* retrieve the ROM in 4k blocks */ 393 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios, 394 int offset, int len) 395 { 396 acpi_status status; 397 union acpi_object rom_arg_elements[2], *obj; 398 struct acpi_object_list rom_arg; 399 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL}; 400 401 rom_arg.count = 2; 402 rom_arg.pointer = &rom_arg_elements[0]; 403 404 rom_arg_elements[0].type = ACPI_TYPE_INTEGER; 405 rom_arg_elements[0].integer.value = offset; 406 407 rom_arg_elements[1].type = ACPI_TYPE_INTEGER; 408 rom_arg_elements[1].integer.value = len; 409 410 status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer); 411 if (ACPI_FAILURE(status)) { 412 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status)); 413 return -ENODEV; 414 } 415 obj = (union acpi_object *)buffer.pointer; 416 memcpy(bios+offset, obj->buffer.pointer, len); 417 kfree(buffer.pointer); 418 return len; 419 } 420 421 bool nouveau_acpi_rom_supported(struct pci_dev *pdev) 422 { 423 acpi_status status; 424 acpi_handle dhandle, rom_handle; 425 426 if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected) 427 return false; 428 429 dhandle = ACPI_HANDLE(&pdev->dev); 430 if (!dhandle) 431 return false; 432 433 status = acpi_get_handle(dhandle, "_ROM", &rom_handle); 434 if (ACPI_FAILURE(status)) 435 return false; 436 437 nouveau_dsm_priv.rom_handle = rom_handle; 438 return true; 439 } 440 441 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len) 442 { 443 return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len); 444 } 445 446 void * 447 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector) 448 { 449 struct acpi_device *acpidev; 450 acpi_handle handle; 451 int type, ret; 452 void *edid; 453 454 switch (connector->connector_type) { 455 case DRM_MODE_CONNECTOR_LVDS: 456 case DRM_MODE_CONNECTOR_eDP: 457 type = ACPI_VIDEO_DISPLAY_LCD; 458 break; 459 default: 460 return NULL; 461 } 462 463 handle = ACPI_HANDLE(&dev->pdev->dev); 464 if (!handle) 465 return NULL; 466 467 ret = acpi_bus_get_device(handle, &acpidev); 468 if (ret) 469 return NULL; 470 471 ret = acpi_video_get_edid(acpidev, type, -1, &edid); 472 if (ret < 0) 473 return NULL; 474 475 return kmemdup(edid, EDID_LENGTH, GFP_KERNEL); 476 } 477