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 rom_handle; 50 } nouveau_dsm_priv; 51 52 bool nouveau_is_optimus(void) { 53 return nouveau_dsm_priv.optimus_detected; 54 } 55 56 bool nouveau_is_v1_dsm(void) { 57 return nouveau_dsm_priv.dsm_detected; 58 } 59 60 #define NOUVEAU_DSM_HAS_MUX 0x1 61 #define NOUVEAU_DSM_HAS_OPT 0x2 62 63 #ifdef CONFIG_VGA_SWITCHEROO 64 static const char nouveau_dsm_muid[] = { 65 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D, 66 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4, 67 }; 68 69 static const char nouveau_op_dsm_muid[] = { 70 0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47, 71 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0, 72 }; 73 74 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result) 75 { 76 int i; 77 union acpi_object *obj; 78 char args_buff[4]; 79 union acpi_object argv4 = { 80 .buffer.type = ACPI_TYPE_BUFFER, 81 .buffer.length = 4, 82 .buffer.pointer = args_buff 83 }; 84 85 /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */ 86 for (i = 0; i < 4; i++) 87 args_buff[i] = (arg >> i * 8) & 0xFF; 88 89 *result = 0; 90 obj = acpi_evaluate_dsm_typed(handle, nouveau_op_dsm_muid, 0x00000100, 91 func, &argv4, ACPI_TYPE_BUFFER); 92 if (!obj) { 93 acpi_handle_info(handle, "failed to evaluate _DSM\n"); 94 return AE_ERROR; 95 } else { 96 if (obj->buffer.length == 4) { 97 *result |= obj->buffer.pointer[0]; 98 *result |= (obj->buffer.pointer[1] << 8); 99 *result |= (obj->buffer.pointer[2] << 16); 100 *result |= (obj->buffer.pointer[3] << 24); 101 } 102 ACPI_FREE(obj); 103 } 104 105 return 0; 106 } 107 108 /* 109 * On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special 110 * requirements on the fourth parameter, so a private implementation 111 * instead of using acpi_check_dsm(). 112 */ 113 static int nouveau_check_optimus_dsm(acpi_handle handle) 114 { 115 int result; 116 117 /* 118 * Function 0 returns a Buffer containing available functions. 119 * The args parameter is ignored for function 0, so just put 0 in it 120 */ 121 if (nouveau_optimus_dsm(handle, 0, 0, &result)) 122 return 0; 123 124 /* 125 * ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. 126 * If the n-th bit is enabled, function n is supported 127 */ 128 return result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS); 129 } 130 131 static int nouveau_dsm(acpi_handle handle, int func, int arg) 132 { 133 int ret = 0; 134 union acpi_object *obj; 135 union acpi_object argv4 = { 136 .integer.type = ACPI_TYPE_INTEGER, 137 .integer.value = arg, 138 }; 139 140 obj = acpi_evaluate_dsm_typed(handle, nouveau_dsm_muid, 0x00000102, 141 func, &argv4, ACPI_TYPE_INTEGER); 142 if (!obj) { 143 acpi_handle_info(handle, "failed to evaluate _DSM\n"); 144 return AE_ERROR; 145 } else { 146 if (obj->integer.value == 0x80000002) 147 ret = -ENODEV; 148 ACPI_FREE(obj); 149 } 150 151 return ret; 152 } 153 154 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id) 155 { 156 mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0); 157 mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0); 158 return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id); 159 } 160 161 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state) 162 { 163 int arg; 164 if (state == VGA_SWITCHEROO_ON) 165 arg = NOUVEAU_DSM_POWER_SPEED; 166 else 167 arg = NOUVEAU_DSM_POWER_STAMINA; 168 nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg); 169 return 0; 170 } 171 172 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id) 173 { 174 if (!nouveau_dsm_priv.dsm_detected) 175 return 0; 176 if (id == VGA_SWITCHEROO_IGD) 177 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA); 178 else 179 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED); 180 } 181 182 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id, 183 enum vga_switcheroo_state state) 184 { 185 if (id == VGA_SWITCHEROO_IGD) 186 return 0; 187 188 /* Optimus laptops have the card already disabled in 189 * nouveau_switcheroo_set_state */ 190 if (!nouveau_dsm_priv.dsm_detected) 191 return 0; 192 193 return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state); 194 } 195 196 static int nouveau_dsm_get_client_id(struct pci_dev *pdev) 197 { 198 /* easy option one - intel vendor ID means Integrated */ 199 if (pdev->vendor == PCI_VENDOR_ID_INTEL) 200 return VGA_SWITCHEROO_IGD; 201 202 /* is this device on Bus 0? - this may need improving */ 203 if (pdev->bus->number == 0) 204 return VGA_SWITCHEROO_IGD; 205 206 return VGA_SWITCHEROO_DIS; 207 } 208 209 static const struct vga_switcheroo_handler nouveau_dsm_handler = { 210 .switchto = nouveau_dsm_switchto, 211 .power_state = nouveau_dsm_power_state, 212 .get_client_id = nouveau_dsm_get_client_id, 213 }; 214 215 static int nouveau_dsm_pci_probe(struct pci_dev *pdev) 216 { 217 acpi_handle dhandle; 218 int retval = 0; 219 220 dhandle = ACPI_HANDLE(&pdev->dev); 221 if (!dhandle) 222 return false; 223 224 if (!acpi_has_method(dhandle, "_DSM")) 225 return false; 226 227 if (acpi_check_dsm(dhandle, nouveau_dsm_muid, 0x00000102, 228 1 << NOUVEAU_DSM_POWER)) 229 retval |= NOUVEAU_DSM_HAS_MUX; 230 231 if (nouveau_check_optimus_dsm(dhandle)) 232 retval |= NOUVEAU_DSM_HAS_OPT; 233 234 if (retval & NOUVEAU_DSM_HAS_OPT) { 235 uint32_t result; 236 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0, 237 &result); 238 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n", 239 (result & OPTIMUS_ENABLED) ? "enabled" : "disabled", 240 (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "", 241 (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : ""); 242 } 243 if (retval) 244 nouveau_dsm_priv.dhandle = dhandle; 245 246 return retval; 247 } 248 249 static bool nouveau_dsm_detect(void) 250 { 251 char acpi_method_name[255] = { 0 }; 252 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; 253 struct pci_dev *pdev = NULL; 254 int has_dsm = 0; 255 int has_optimus = 0; 256 int vga_count = 0; 257 bool guid_valid; 258 int retval; 259 bool ret = false; 260 261 /* lookup the MXM GUID */ 262 guid_valid = mxm_wmi_supported(); 263 264 if (guid_valid) 265 printk("MXM: GUID detected in BIOS\n"); 266 267 /* now do DSM detection */ 268 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { 269 vga_count++; 270 271 retval = nouveau_dsm_pci_probe(pdev); 272 if (retval & NOUVEAU_DSM_HAS_MUX) 273 has_dsm |= 1; 274 if (retval & NOUVEAU_DSM_HAS_OPT) 275 has_optimus = 1; 276 } 277 278 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) { 279 vga_count++; 280 281 retval = nouveau_dsm_pci_probe(pdev); 282 if (retval & NOUVEAU_DSM_HAS_MUX) 283 has_dsm |= 1; 284 if (retval & NOUVEAU_DSM_HAS_OPT) 285 has_optimus = 1; 286 } 287 288 /* find the optimus DSM or the old v1 DSM */ 289 if (has_optimus == 1) { 290 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, 291 &buffer); 292 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n", 293 acpi_method_name); 294 nouveau_dsm_priv.optimus_detected = true; 295 ret = true; 296 } else if (vga_count == 2 && has_dsm && guid_valid) { 297 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, 298 &buffer); 299 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n", 300 acpi_method_name); 301 nouveau_dsm_priv.dsm_detected = true; 302 ret = true; 303 } 304 305 306 return ret; 307 } 308 309 void nouveau_register_dsm_handler(void) 310 { 311 bool r; 312 313 r = nouveau_dsm_detect(); 314 if (!r) 315 return; 316 317 vga_switcheroo_register_handler(&nouveau_dsm_handler); 318 } 319 320 /* Must be called for Optimus models before the card can be turned off */ 321 void nouveau_switcheroo_optimus_dsm(void) 322 { 323 u32 result = 0; 324 if (!nouveau_dsm_priv.optimus_detected) 325 return; 326 327 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS, 328 0x3, &result); 329 330 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 331 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result); 332 333 } 334 335 void nouveau_unregister_dsm_handler(void) 336 { 337 if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected) 338 vga_switcheroo_unregister_handler(); 339 } 340 #else 341 void nouveau_register_dsm_handler(void) {} 342 void nouveau_unregister_dsm_handler(void) {} 343 void nouveau_switcheroo_optimus_dsm(void) {} 344 #endif 345 346 /* retrieve the ROM in 4k blocks */ 347 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios, 348 int offset, int len) 349 { 350 acpi_status status; 351 union acpi_object rom_arg_elements[2], *obj; 352 struct acpi_object_list rom_arg; 353 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL}; 354 355 rom_arg.count = 2; 356 rom_arg.pointer = &rom_arg_elements[0]; 357 358 rom_arg_elements[0].type = ACPI_TYPE_INTEGER; 359 rom_arg_elements[0].integer.value = offset; 360 361 rom_arg_elements[1].type = ACPI_TYPE_INTEGER; 362 rom_arg_elements[1].integer.value = len; 363 364 status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer); 365 if (ACPI_FAILURE(status)) { 366 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status)); 367 return -ENODEV; 368 } 369 obj = (union acpi_object *)buffer.pointer; 370 len = min(len, (int)obj->buffer.length); 371 memcpy(bios+offset, obj->buffer.pointer, len); 372 kfree(buffer.pointer); 373 return len; 374 } 375 376 bool nouveau_acpi_rom_supported(struct device *dev) 377 { 378 acpi_status status; 379 acpi_handle dhandle, rom_handle; 380 381 dhandle = ACPI_HANDLE(dev); 382 if (!dhandle) 383 return false; 384 385 status = acpi_get_handle(dhandle, "_ROM", &rom_handle); 386 if (ACPI_FAILURE(status)) 387 return false; 388 389 nouveau_dsm_priv.rom_handle = rom_handle; 390 return true; 391 } 392 393 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len) 394 { 395 return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len); 396 } 397 398 void * 399 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector) 400 { 401 struct acpi_device *acpidev; 402 acpi_handle handle; 403 int type, ret; 404 void *edid; 405 406 switch (connector->connector_type) { 407 case DRM_MODE_CONNECTOR_LVDS: 408 case DRM_MODE_CONNECTOR_eDP: 409 type = ACPI_VIDEO_DISPLAY_LCD; 410 break; 411 default: 412 return NULL; 413 } 414 415 handle = ACPI_HANDLE(&dev->pdev->dev); 416 if (!handle) 417 return NULL; 418 419 ret = acpi_bus_get_device(handle, &acpidev); 420 if (ret) 421 return NULL; 422 423 ret = acpi_video_get_edid(acpidev, type, -1, &edid); 424 if (ret < 0) 425 return NULL; 426 427 return kmemdup(edid, EDID_LENGTH, GFP_KERNEL); 428 } 429