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