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_drm.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 acpi_handle dhandle; 49 acpi_handle other_handle; 50 acpi_handle rom_handle; 51 } nouveau_dsm_priv; 52 53 bool nouveau_is_optimus(void) { 54 return nouveau_dsm_priv.optimus_detected; 55 } 56 57 bool nouveau_is_v1_dsm(void) { 58 return nouveau_dsm_priv.dsm_detected; 59 } 60 61 #define NOUVEAU_DSM_HAS_MUX 0x1 62 #define NOUVEAU_DSM_HAS_OPT 0x2 63 64 #ifdef CONFIG_VGA_SWITCHEROO 65 static const char nouveau_dsm_muid[] = { 66 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D, 67 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4, 68 }; 69 70 static const char nouveau_op_dsm_muid[] = { 71 0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47, 72 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0, 73 }; 74 75 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result) 76 { 77 int i; 78 union acpi_object *obj; 79 char args_buff[4]; 80 union acpi_object argv4 = { 81 .buffer.type = ACPI_TYPE_BUFFER, 82 .buffer.length = 4, 83 .buffer.pointer = args_buff 84 }; 85 86 /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */ 87 for (i = 0; i < 4; i++) 88 args_buff[i] = (arg >> i * 8) & 0xFF; 89 90 *result = 0; 91 obj = acpi_evaluate_dsm_typed(handle, nouveau_op_dsm_muid, 0x00000100, 92 func, &argv4, ACPI_TYPE_BUFFER); 93 if (!obj) { 94 acpi_handle_info(handle, "failed to evaluate _DSM\n"); 95 return AE_ERROR; 96 } else { 97 if (obj->buffer.length == 4) { 98 *result |= obj->buffer.pointer[0]; 99 *result |= (obj->buffer.pointer[1] << 8); 100 *result |= (obj->buffer.pointer[2] << 16); 101 *result |= (obj->buffer.pointer[3] << 24); 102 } 103 ACPI_FREE(obj); 104 } 105 106 return 0; 107 } 108 109 /* 110 * On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special 111 * requirements on the fourth parameter, so a private implementation 112 * instead of using acpi_check_dsm(). 113 */ 114 static int nouveau_check_optimus_dsm(acpi_handle handle) 115 { 116 int result; 117 118 /* 119 * Function 0 returns a Buffer containing available functions. 120 * The args parameter is ignored for function 0, so just put 0 in it 121 */ 122 if (nouveau_optimus_dsm(handle, 0, 0, &result)) 123 return 0; 124 125 /* 126 * ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. 127 * If the n-th bit is enabled, function n is supported 128 */ 129 return result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS); 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 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 static int nouveau_dsm_pci_probe(struct pci_dev *pdev) 217 { 218 acpi_handle dhandle; 219 int retval = 0; 220 221 dhandle = ACPI_HANDLE(&pdev->dev); 222 if (!dhandle) 223 return false; 224 225 if (!acpi_has_method(dhandle, "_DSM")) { 226 nouveau_dsm_priv.other_handle = dhandle; 227 return false; 228 } 229 if (acpi_check_dsm(dhandle, nouveau_dsm_muid, 0x00000102, 230 1 << NOUVEAU_DSM_POWER)) 231 retval |= NOUVEAU_DSM_HAS_MUX; 232 233 if (nouveau_check_optimus_dsm(dhandle)) 234 retval |= NOUVEAU_DSM_HAS_OPT; 235 236 if (retval & NOUVEAU_DSM_HAS_OPT) { 237 uint32_t result; 238 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0, 239 &result); 240 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n", 241 (result & OPTIMUS_ENABLED) ? "enabled" : "disabled", 242 (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "", 243 (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : ""); 244 } 245 if (retval) 246 nouveau_dsm_priv.dhandle = dhandle; 247 248 return retval; 249 } 250 251 static bool nouveau_dsm_detect(void) 252 { 253 char acpi_method_name[255] = { 0 }; 254 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; 255 struct pci_dev *pdev = NULL; 256 int has_dsm = 0; 257 int has_optimus = 0; 258 int vga_count = 0; 259 bool guid_valid; 260 int retval; 261 bool ret = false; 262 263 /* lookup the MXM GUID */ 264 guid_valid = mxm_wmi_supported(); 265 266 if (guid_valid) 267 printk("MXM: GUID detected in BIOS\n"); 268 269 /* now do DSM detection */ 270 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { 271 vga_count++; 272 273 retval = nouveau_dsm_pci_probe(pdev); 274 if (retval & NOUVEAU_DSM_HAS_MUX) 275 has_dsm |= 1; 276 if (retval & NOUVEAU_DSM_HAS_OPT) 277 has_optimus = 1; 278 } 279 280 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) { 281 vga_count++; 282 283 retval = nouveau_dsm_pci_probe(pdev); 284 if (retval & NOUVEAU_DSM_HAS_MUX) 285 has_dsm |= 1; 286 if (retval & NOUVEAU_DSM_HAS_OPT) 287 has_optimus = 1; 288 } 289 290 /* find the optimus DSM or the old v1 DSM */ 291 if (has_optimus == 1) { 292 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, 293 &buffer); 294 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n", 295 acpi_method_name); 296 nouveau_dsm_priv.optimus_detected = true; 297 ret = true; 298 } else if (vga_count == 2 && has_dsm && guid_valid) { 299 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, 300 &buffer); 301 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n", 302 acpi_method_name); 303 nouveau_dsm_priv.dsm_detected = true; 304 /* 305 * On some systems hotplug events are generated for the device 306 * being switched off when _DSM is executed. They cause ACPI 307 * hotplug to trigger and attempt to remove the device from 308 * the system, which causes it to break down. Prevent that from 309 * happening by setting the no_hotplug flag for the involved 310 * ACPI device objects. 311 */ 312 acpi_bus_no_hotplug(nouveau_dsm_priv.dhandle); 313 acpi_bus_no_hotplug(nouveau_dsm_priv.other_handle); 314 ret = true; 315 } 316 317 318 return ret; 319 } 320 321 void nouveau_register_dsm_handler(void) 322 { 323 bool r; 324 325 r = nouveau_dsm_detect(); 326 if (!r) 327 return; 328 329 vga_switcheroo_register_handler(&nouveau_dsm_handler); 330 } 331 332 /* Must be called for Optimus models before the card can be turned off */ 333 void nouveau_switcheroo_optimus_dsm(void) 334 { 335 u32 result = 0; 336 if (!nouveau_dsm_priv.optimus_detected) 337 return; 338 339 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS, 340 0x3, &result); 341 342 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 343 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result); 344 345 } 346 347 void nouveau_unregister_dsm_handler(void) 348 { 349 if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected) 350 vga_switcheroo_unregister_handler(); 351 } 352 #else 353 void nouveau_register_dsm_handler(void) {} 354 void nouveau_unregister_dsm_handler(void) {} 355 void nouveau_switcheroo_optimus_dsm(void) {} 356 #endif 357 358 /* retrieve the ROM in 4k blocks */ 359 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios, 360 int offset, int len) 361 { 362 acpi_status status; 363 union acpi_object rom_arg_elements[2], *obj; 364 struct acpi_object_list rom_arg; 365 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL}; 366 367 rom_arg.count = 2; 368 rom_arg.pointer = &rom_arg_elements[0]; 369 370 rom_arg_elements[0].type = ACPI_TYPE_INTEGER; 371 rom_arg_elements[0].integer.value = offset; 372 373 rom_arg_elements[1].type = ACPI_TYPE_INTEGER; 374 rom_arg_elements[1].integer.value = len; 375 376 status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer); 377 if (ACPI_FAILURE(status)) { 378 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status)); 379 return -ENODEV; 380 } 381 obj = (union acpi_object *)buffer.pointer; 382 memcpy(bios+offset, obj->buffer.pointer, len); 383 kfree(buffer.pointer); 384 return len; 385 } 386 387 bool nouveau_acpi_rom_supported(struct pci_dev *pdev) 388 { 389 acpi_status status; 390 acpi_handle dhandle, rom_handle; 391 392 if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected) 393 return false; 394 395 dhandle = ACPI_HANDLE(&pdev->dev); 396 if (!dhandle) 397 return false; 398 399 status = acpi_get_handle(dhandle, "_ROM", &rom_handle); 400 if (ACPI_FAILURE(status)) 401 return false; 402 403 nouveau_dsm_priv.rom_handle = rom_handle; 404 return true; 405 } 406 407 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len) 408 { 409 return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len); 410 } 411 412 void * 413 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector) 414 { 415 struct acpi_device *acpidev; 416 acpi_handle handle; 417 int type, ret; 418 void *edid; 419 420 switch (connector->connector_type) { 421 case DRM_MODE_CONNECTOR_LVDS: 422 case DRM_MODE_CONNECTOR_eDP: 423 type = ACPI_VIDEO_DISPLAY_LCD; 424 break; 425 default: 426 return NULL; 427 } 428 429 handle = ACPI_HANDLE(&dev->pdev->dev); 430 if (!handle) 431 return NULL; 432 433 ret = acpi_bus_get_device(handle, &acpidev); 434 if (ret) 435 return NULL; 436 437 ret = acpi_video_get_edid(acpidev, type, -1, &edid); 438 if (ret < 0) 439 return NULL; 440 441 return kmemdup(edid, EDID_LENGTH, GFP_KERNEL); 442 } 443