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_FN 0x1A 29 #define NOUVEAU_DSM_OPTIMUS_ARGS 0x03000001 30 31 static struct nouveau_dsm_priv { 32 bool dsm_detected; 33 bool optimus_detected; 34 acpi_handle dhandle; 35 acpi_handle rom_handle; 36 } nouveau_dsm_priv; 37 38 #define NOUVEAU_DSM_HAS_MUX 0x1 39 #define NOUVEAU_DSM_HAS_OPT 0x2 40 41 static const char nouveau_dsm_muid[] = { 42 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D, 43 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4, 44 }; 45 46 static const char nouveau_op_dsm_muid[] = { 47 0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47, 48 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0, 49 }; 50 51 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result) 52 { 53 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; 54 struct acpi_object_list input; 55 union acpi_object params[4]; 56 union acpi_object *obj; 57 int i, err; 58 char args_buff[4]; 59 60 input.count = 4; 61 input.pointer = params; 62 params[0].type = ACPI_TYPE_BUFFER; 63 params[0].buffer.length = sizeof(nouveau_op_dsm_muid); 64 params[0].buffer.pointer = (char *)nouveau_op_dsm_muid; 65 params[1].type = ACPI_TYPE_INTEGER; 66 params[1].integer.value = 0x00000100; 67 params[2].type = ACPI_TYPE_INTEGER; 68 params[2].integer.value = func; 69 params[3].type = ACPI_TYPE_BUFFER; 70 params[3].buffer.length = 4; 71 /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */ 72 for (i = 0; i < 4; i++) 73 args_buff[i] = (arg >> i * 8) & 0xFF; 74 params[3].buffer.pointer = args_buff; 75 76 err = acpi_evaluate_object(handle, "_DSM", &input, &output); 77 if (err) { 78 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err); 79 return err; 80 } 81 82 obj = (union acpi_object *)output.pointer; 83 84 if (obj->type == ACPI_TYPE_INTEGER) 85 if (obj->integer.value == 0x80000002) { 86 return -ENODEV; 87 } 88 89 if (obj->type == ACPI_TYPE_BUFFER) { 90 if (obj->buffer.length == 4 && result) { 91 *result = 0; 92 *result |= obj->buffer.pointer[0]; 93 *result |= (obj->buffer.pointer[1] << 8); 94 *result |= (obj->buffer.pointer[2] << 16); 95 *result |= (obj->buffer.pointer[3] << 24); 96 } 97 } 98 99 kfree(output.pointer); 100 return 0; 101 } 102 103 static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result) 104 { 105 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; 106 struct acpi_object_list input; 107 union acpi_object params[4]; 108 union acpi_object *obj; 109 int err; 110 111 input.count = 4; 112 input.pointer = params; 113 params[0].type = ACPI_TYPE_BUFFER; 114 params[0].buffer.length = sizeof(nouveau_dsm_muid); 115 params[0].buffer.pointer = (char *)nouveau_dsm_muid; 116 params[1].type = ACPI_TYPE_INTEGER; 117 params[1].integer.value = 0x00000102; 118 params[2].type = ACPI_TYPE_INTEGER; 119 params[2].integer.value = func; 120 params[3].type = ACPI_TYPE_INTEGER; 121 params[3].integer.value = arg; 122 123 err = acpi_evaluate_object(handle, "_DSM", &input, &output); 124 if (err) { 125 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err); 126 return err; 127 } 128 129 obj = (union acpi_object *)output.pointer; 130 131 if (obj->type == ACPI_TYPE_INTEGER) 132 if (obj->integer.value == 0x80000002) 133 return -ENODEV; 134 135 if (obj->type == ACPI_TYPE_BUFFER) { 136 if (obj->buffer.length == 4 && result) { 137 *result = 0; 138 *result |= obj->buffer.pointer[0]; 139 *result |= (obj->buffer.pointer[1] << 8); 140 *result |= (obj->buffer.pointer[2] << 16); 141 *result |= (obj->buffer.pointer[3] << 24); 142 } 143 } 144 145 kfree(output.pointer); 146 return 0; 147 } 148 149 /* Returns 1 if a DSM function is usable and 0 otherwise */ 150 static int nouveau_test_dsm(acpi_handle test_handle, 151 int (*dsm_func)(acpi_handle, int, int, uint32_t *), 152 int sfnc) 153 { 154 u32 result = 0; 155 156 /* Function 0 returns a Buffer containing available functions. The args 157 * parameter is ignored for function 0, so just put 0 in it */ 158 if (dsm_func(test_handle, 0, 0, &result)) 159 return 0; 160 161 /* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If 162 * the n-th bit is enabled, function n is supported */ 163 return result & 1 && result & (1 << sfnc); 164 } 165 166 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id) 167 { 168 mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0); 169 mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0); 170 return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL); 171 } 172 173 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state) 174 { 175 int arg; 176 if (state == VGA_SWITCHEROO_ON) 177 arg = NOUVEAU_DSM_POWER_SPEED; 178 else 179 arg = NOUVEAU_DSM_POWER_STAMINA; 180 nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL); 181 return 0; 182 } 183 184 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id) 185 { 186 /* perhaps the _DSM functions are mutually exclusive, but prepare for 187 * the future */ 188 if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected) 189 return 0; 190 if (id == VGA_SWITCHEROO_IGD) 191 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA); 192 else 193 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED); 194 } 195 196 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id, 197 enum vga_switcheroo_state state) 198 { 199 if (id == VGA_SWITCHEROO_IGD) 200 return 0; 201 202 /* Optimus laptops have the card already disabled in 203 * nouveau_switcheroo_set_state */ 204 if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected) 205 return 0; 206 207 return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state); 208 } 209 210 static int nouveau_dsm_get_client_id(struct pci_dev *pdev) 211 { 212 /* easy option one - intel vendor ID means Integrated */ 213 if (pdev->vendor == PCI_VENDOR_ID_INTEL) 214 return VGA_SWITCHEROO_IGD; 215 216 /* is this device on Bus 0? - this may need improving */ 217 if (pdev->bus->number == 0) 218 return VGA_SWITCHEROO_IGD; 219 220 return VGA_SWITCHEROO_DIS; 221 } 222 223 static struct vga_switcheroo_handler nouveau_dsm_handler = { 224 .switchto = nouveau_dsm_switchto, 225 .power_state = nouveau_dsm_power_state, 226 .get_client_id = nouveau_dsm_get_client_id, 227 }; 228 229 static int nouveau_dsm_pci_probe(struct pci_dev *pdev) 230 { 231 acpi_handle dhandle, nvidia_handle; 232 acpi_status status; 233 int retval = 0; 234 235 dhandle = DEVICE_ACPI_HANDLE(&pdev->dev); 236 if (!dhandle) 237 return false; 238 239 status = acpi_get_handle(dhandle, "_DSM", &nvidia_handle); 240 if (ACPI_FAILURE(status)) { 241 return false; 242 } 243 244 if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER)) 245 retval |= NOUVEAU_DSM_HAS_MUX; 246 247 if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm, 248 NOUVEAU_DSM_OPTIMUS_FN)) 249 retval |= NOUVEAU_DSM_HAS_OPT; 250 251 if (retval) 252 nouveau_dsm_priv.dhandle = dhandle; 253 254 return retval; 255 } 256 257 static bool nouveau_dsm_detect(void) 258 { 259 char acpi_method_name[255] = { 0 }; 260 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; 261 struct pci_dev *pdev = NULL; 262 int has_dsm = 0; 263 int has_optimus = 0; 264 int vga_count = 0; 265 bool guid_valid; 266 int retval; 267 bool ret = false; 268 269 /* lookup the MXM GUID */ 270 guid_valid = mxm_wmi_supported(); 271 272 if (guid_valid) 273 printk("MXM: GUID detected in BIOS\n"); 274 275 /* now do DSM detection */ 276 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { 277 vga_count++; 278 279 retval = nouveau_dsm_pci_probe(pdev); 280 if (retval & NOUVEAU_DSM_HAS_MUX) 281 has_dsm |= 1; 282 if (retval & NOUVEAU_DSM_HAS_OPT) 283 has_optimus = 1; 284 } 285 286 if (vga_count == 2 && has_dsm && guid_valid) { 287 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, 288 &buffer); 289 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n", 290 acpi_method_name); 291 nouveau_dsm_priv.dsm_detected = true; 292 ret = true; 293 } 294 295 if (has_optimus == 1) { 296 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, 297 &buffer); 298 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n", 299 acpi_method_name); 300 nouveau_dsm_priv.optimus_detected = true; 301 ret = true; 302 } 303 304 return ret; 305 } 306 307 void nouveau_register_dsm_handler(void) 308 { 309 bool r; 310 311 r = nouveau_dsm_detect(); 312 if (!r) 313 return; 314 315 vga_switcheroo_register_handler(&nouveau_dsm_handler); 316 } 317 318 /* Must be called for Optimus models before the card can be turned off */ 319 void nouveau_switcheroo_optimus_dsm(void) 320 { 321 u32 result = 0; 322 if (!nouveau_dsm_priv.optimus_detected) 323 return; 324 325 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FN, 326 NOUVEAU_DSM_OPTIMUS_ARGS, &result); 327 } 328 329 void nouveau_unregister_dsm_handler(void) 330 { 331 if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected) 332 vga_switcheroo_unregister_handler(); 333 } 334 335 /* retrieve the ROM in 4k blocks */ 336 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios, 337 int offset, int len) 338 { 339 acpi_status status; 340 union acpi_object rom_arg_elements[2], *obj; 341 struct acpi_object_list rom_arg; 342 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL}; 343 344 rom_arg.count = 2; 345 rom_arg.pointer = &rom_arg_elements[0]; 346 347 rom_arg_elements[0].type = ACPI_TYPE_INTEGER; 348 rom_arg_elements[0].integer.value = offset; 349 350 rom_arg_elements[1].type = ACPI_TYPE_INTEGER; 351 rom_arg_elements[1].integer.value = len; 352 353 status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer); 354 if (ACPI_FAILURE(status)) { 355 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status)); 356 return -ENODEV; 357 } 358 obj = (union acpi_object *)buffer.pointer; 359 memcpy(bios+offset, obj->buffer.pointer, len); 360 kfree(buffer.pointer); 361 return len; 362 } 363 364 bool nouveau_acpi_rom_supported(struct pci_dev *pdev) 365 { 366 acpi_status status; 367 acpi_handle dhandle, rom_handle; 368 369 if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected) 370 return false; 371 372 dhandle = DEVICE_ACPI_HANDLE(&pdev->dev); 373 if (!dhandle) 374 return false; 375 376 status = acpi_get_handle(dhandle, "_ROM", &rom_handle); 377 if (ACPI_FAILURE(status)) 378 return false; 379 380 nouveau_dsm_priv.rom_handle = rom_handle; 381 return true; 382 } 383 384 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len) 385 { 386 return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len); 387 } 388 389 void * 390 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector) 391 { 392 struct acpi_device *acpidev; 393 acpi_handle handle; 394 int type, ret; 395 void *edid; 396 397 switch (connector->connector_type) { 398 case DRM_MODE_CONNECTOR_LVDS: 399 case DRM_MODE_CONNECTOR_eDP: 400 type = ACPI_VIDEO_DISPLAY_LCD; 401 break; 402 default: 403 return NULL; 404 } 405 406 handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev); 407 if (!handle) 408 return NULL; 409 410 ret = acpi_bus_get_device(handle, &acpidev); 411 if (ret) 412 return NULL; 413 414 ret = acpi_video_get_edid(acpidev, type, -1, &edid); 415 if (ret < 0) 416 return NULL; 417 418 return kmemdup(edid, EDID_LENGTH, GFP_KERNEL); 419 } 420