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 static int nouveau_dsm(acpi_handle handle, int func, int arg) 110 { 111 int ret = 0; 112 union acpi_object *obj; 113 union acpi_object argv4 = { 114 .integer.type = ACPI_TYPE_INTEGER, 115 .integer.value = arg, 116 }; 117 118 obj = acpi_evaluate_dsm_typed(handle, nouveau_dsm_muid, 0x00000102, 119 func, &argv4, ACPI_TYPE_INTEGER); 120 if (!obj) { 121 acpi_handle_info(handle, "failed to evaluate _DSM\n"); 122 return AE_ERROR; 123 } else { 124 if (obj->integer.value == 0x80000002) 125 ret = -ENODEV; 126 ACPI_FREE(obj); 127 } 128 129 return ret; 130 } 131 132 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id) 133 { 134 mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0); 135 mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0); 136 return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id); 137 } 138 139 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state) 140 { 141 int arg; 142 if (state == VGA_SWITCHEROO_ON) 143 arg = NOUVEAU_DSM_POWER_SPEED; 144 else 145 arg = NOUVEAU_DSM_POWER_STAMINA; 146 nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg); 147 return 0; 148 } 149 150 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id) 151 { 152 if (!nouveau_dsm_priv.dsm_detected) 153 return 0; 154 if (id == VGA_SWITCHEROO_IGD) 155 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA); 156 else 157 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED); 158 } 159 160 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id, 161 enum vga_switcheroo_state state) 162 { 163 if (id == VGA_SWITCHEROO_IGD) 164 return 0; 165 166 /* Optimus laptops have the card already disabled in 167 * nouveau_switcheroo_set_state */ 168 if (!nouveau_dsm_priv.dsm_detected) 169 return 0; 170 171 return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state); 172 } 173 174 static int nouveau_dsm_get_client_id(struct pci_dev *pdev) 175 { 176 /* easy option one - intel vendor ID means Integrated */ 177 if (pdev->vendor == PCI_VENDOR_ID_INTEL) 178 return VGA_SWITCHEROO_IGD; 179 180 /* is this device on Bus 0? - this may need improving */ 181 if (pdev->bus->number == 0) 182 return VGA_SWITCHEROO_IGD; 183 184 return VGA_SWITCHEROO_DIS; 185 } 186 187 static struct vga_switcheroo_handler nouveau_dsm_handler = { 188 .switchto = nouveau_dsm_switchto, 189 .power_state = nouveau_dsm_power_state, 190 .get_client_id = nouveau_dsm_get_client_id, 191 }; 192 193 static int nouveau_dsm_pci_probe(struct pci_dev *pdev) 194 { 195 acpi_handle dhandle; 196 int retval = 0; 197 198 dhandle = ACPI_HANDLE(&pdev->dev); 199 if (!dhandle) 200 return false; 201 202 if (!acpi_has_method(dhandle, "_DSM")) { 203 nouveau_dsm_priv.other_handle = dhandle; 204 return false; 205 } 206 if (acpi_check_dsm(dhandle, nouveau_dsm_muid, 0x00000102, 207 1 << NOUVEAU_DSM_POWER)) 208 retval |= NOUVEAU_DSM_HAS_MUX; 209 210 if (acpi_check_dsm(dhandle, nouveau_op_dsm_muid, 0x00000100, 211 1 << NOUVEAU_DSM_OPTIMUS_CAPS)) 212 retval |= NOUVEAU_DSM_HAS_OPT; 213 214 if (retval & NOUVEAU_DSM_HAS_OPT) { 215 uint32_t result; 216 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0, 217 &result); 218 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n", 219 (result & OPTIMUS_ENABLED) ? "enabled" : "disabled", 220 (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "", 221 (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : ""); 222 } 223 if (retval) 224 nouveau_dsm_priv.dhandle = dhandle; 225 226 return retval; 227 } 228 229 static bool nouveau_dsm_detect(void) 230 { 231 char acpi_method_name[255] = { 0 }; 232 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; 233 struct pci_dev *pdev = NULL; 234 int has_dsm = 0; 235 int has_optimus = 0; 236 int vga_count = 0; 237 bool guid_valid; 238 int retval; 239 bool ret = false; 240 241 /* lookup the MXM GUID */ 242 guid_valid = mxm_wmi_supported(); 243 244 if (guid_valid) 245 printk("MXM: GUID detected in BIOS\n"); 246 247 /* now do DSM detection */ 248 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { 249 vga_count++; 250 251 retval = nouveau_dsm_pci_probe(pdev); 252 if (retval & NOUVEAU_DSM_HAS_MUX) 253 has_dsm |= 1; 254 if (retval & NOUVEAU_DSM_HAS_OPT) 255 has_optimus = 1; 256 } 257 258 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) { 259 vga_count++; 260 261 retval = nouveau_dsm_pci_probe(pdev); 262 if (retval & NOUVEAU_DSM_HAS_MUX) 263 has_dsm |= 1; 264 if (retval & NOUVEAU_DSM_HAS_OPT) 265 has_optimus = 1; 266 } 267 268 /* find the optimus DSM or the old v1 DSM */ 269 if (has_optimus == 1) { 270 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, 271 &buffer); 272 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n", 273 acpi_method_name); 274 nouveau_dsm_priv.optimus_detected = true; 275 ret = true; 276 } else if (vga_count == 2 && has_dsm && guid_valid) { 277 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, 278 &buffer); 279 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n", 280 acpi_method_name); 281 nouveau_dsm_priv.dsm_detected = true; 282 /* 283 * On some systems hotplug events are generated for the device 284 * being switched off when _DSM is executed. They cause ACPI 285 * hotplug to trigger and attempt to remove the device from 286 * the system, which causes it to break down. Prevent that from 287 * happening by setting the no_hotplug flag for the involved 288 * ACPI device objects. 289 */ 290 acpi_bus_no_hotplug(nouveau_dsm_priv.dhandle); 291 acpi_bus_no_hotplug(nouveau_dsm_priv.other_handle); 292 ret = true; 293 } 294 295 296 return ret; 297 } 298 299 void nouveau_register_dsm_handler(void) 300 { 301 bool r; 302 303 r = nouveau_dsm_detect(); 304 if (!r) 305 return; 306 307 vga_switcheroo_register_handler(&nouveau_dsm_handler); 308 } 309 310 /* Must be called for Optimus models before the card can be turned off */ 311 void nouveau_switcheroo_optimus_dsm(void) 312 { 313 u32 result = 0; 314 if (!nouveau_dsm_priv.optimus_detected) 315 return; 316 317 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS, 318 0x3, &result); 319 320 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 321 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result); 322 323 } 324 325 void nouveau_unregister_dsm_handler(void) 326 { 327 if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected) 328 vga_switcheroo_unregister_handler(); 329 } 330 #else 331 void nouveau_register_dsm_handler(void) {} 332 void nouveau_unregister_dsm_handler(void) {} 333 void nouveau_switcheroo_optimus_dsm(void) {} 334 #endif 335 336 /* retrieve the ROM in 4k blocks */ 337 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios, 338 int offset, int len) 339 { 340 acpi_status status; 341 union acpi_object rom_arg_elements[2], *obj; 342 struct acpi_object_list rom_arg; 343 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL}; 344 345 rom_arg.count = 2; 346 rom_arg.pointer = &rom_arg_elements[0]; 347 348 rom_arg_elements[0].type = ACPI_TYPE_INTEGER; 349 rom_arg_elements[0].integer.value = offset; 350 351 rom_arg_elements[1].type = ACPI_TYPE_INTEGER; 352 rom_arg_elements[1].integer.value = len; 353 354 status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer); 355 if (ACPI_FAILURE(status)) { 356 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status)); 357 return -ENODEV; 358 } 359 obj = (union acpi_object *)buffer.pointer; 360 memcpy(bios+offset, obj->buffer.pointer, len); 361 kfree(buffer.pointer); 362 return len; 363 } 364 365 bool nouveau_acpi_rom_supported(struct pci_dev *pdev) 366 { 367 acpi_status status; 368 acpi_handle dhandle, rom_handle; 369 370 if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected) 371 return false; 372 373 dhandle = ACPI_HANDLE(&pdev->dev); 374 if (!dhandle) 375 return false; 376 377 status = acpi_get_handle(dhandle, "_ROM", &rom_handle); 378 if (ACPI_FAILURE(status)) 379 return false; 380 381 nouveau_dsm_priv.rom_handle = rom_handle; 382 return true; 383 } 384 385 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len) 386 { 387 return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len); 388 } 389 390 void * 391 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector) 392 { 393 struct acpi_device *acpidev; 394 acpi_handle handle; 395 int type, ret; 396 void *edid; 397 398 switch (connector->connector_type) { 399 case DRM_MODE_CONNECTOR_LVDS: 400 case DRM_MODE_CONNECTOR_eDP: 401 type = ACPI_VIDEO_DISPLAY_LCD; 402 break; 403 default: 404 return NULL; 405 } 406 407 handle = ACPI_HANDLE(&dev->pdev->dev); 408 if (!handle) 409 return NULL; 410 411 ret = acpi_bus_get_device(handle, &acpidev); 412 if (ret) 413 return NULL; 414 415 ret = acpi_video_get_edid(acpidev, type, -1, &edid); 416 if (ret < 0) 417 return NULL; 418 419 return kmemdup(edid, EDID_LENGTH, GFP_KERNEL); 420 } 421