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