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 "drmP.h" 11 #include "drm.h" 12 #include "drm_sarea.h" 13 #include "drm_crtc_helper.h" 14 #include "nouveau_drv.h" 15 #include "nouveau_drm.h" 16 #include "nv50_display.h" 17 #include "nouveau_connector.h" 18 19 #include <linux/vga_switcheroo.h> 20 21 #define NOUVEAU_DSM_LED 0x02 22 #define NOUVEAU_DSM_LED_STATE 0x00 23 #define NOUVEAU_DSM_LED_OFF 0x10 24 #define NOUVEAU_DSM_LED_STAMINA 0x11 25 #define NOUVEAU_DSM_LED_SPEED 0x12 26 27 #define NOUVEAU_DSM_POWER 0x03 28 #define NOUVEAU_DSM_POWER_STATE 0x00 29 #define NOUVEAU_DSM_POWER_SPEED 0x01 30 #define NOUVEAU_DSM_POWER_STAMINA 0x02 31 32 #define NOUVEAU_DSM_OPTIMUS_FN 0x1A 33 #define NOUVEAU_DSM_OPTIMUS_ARGS 0x03000001 34 35 static struct nouveau_dsm_priv { 36 bool dsm_detected; 37 bool optimus_detected; 38 acpi_handle dhandle; 39 acpi_handle rom_handle; 40 } nouveau_dsm_priv; 41 42 #define NOUVEAU_DSM_HAS_MUX 0x1 43 #define NOUVEAU_DSM_HAS_OPT 0x2 44 45 static const char nouveau_dsm_muid[] = { 46 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D, 47 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4, 48 }; 49 50 static const char nouveau_op_dsm_muid[] = { 51 0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47, 52 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0, 53 }; 54 55 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result) 56 { 57 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; 58 struct acpi_object_list input; 59 union acpi_object params[4]; 60 union acpi_object *obj; 61 int i, err; 62 char args_buff[4]; 63 64 input.count = 4; 65 input.pointer = params; 66 params[0].type = ACPI_TYPE_BUFFER; 67 params[0].buffer.length = sizeof(nouveau_op_dsm_muid); 68 params[0].buffer.pointer = (char *)nouveau_op_dsm_muid; 69 params[1].type = ACPI_TYPE_INTEGER; 70 params[1].integer.value = 0x00000100; 71 params[2].type = ACPI_TYPE_INTEGER; 72 params[2].integer.value = func; 73 params[3].type = ACPI_TYPE_BUFFER; 74 params[3].buffer.length = 4; 75 /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */ 76 for (i = 0; i < 4; i++) 77 args_buff[i] = (arg >> i * 8) & 0xFF; 78 params[3].buffer.pointer = args_buff; 79 80 err = acpi_evaluate_object(handle, "_DSM", &input, &output); 81 if (err) { 82 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err); 83 return err; 84 } 85 86 obj = (union acpi_object *)output.pointer; 87 88 if (obj->type == ACPI_TYPE_INTEGER) 89 if (obj->integer.value == 0x80000002) { 90 return -ENODEV; 91 } 92 93 if (obj->type == ACPI_TYPE_BUFFER) { 94 if (obj->buffer.length == 4 && result) { 95 *result = 0; 96 *result |= obj->buffer.pointer[0]; 97 *result |= (obj->buffer.pointer[1] << 8); 98 *result |= (obj->buffer.pointer[2] << 16); 99 *result |= (obj->buffer.pointer[3] << 24); 100 } 101 } 102 103 kfree(output.pointer); 104 return 0; 105 } 106 107 static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result) 108 { 109 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; 110 struct acpi_object_list input; 111 union acpi_object params[4]; 112 union acpi_object *obj; 113 int err; 114 115 input.count = 4; 116 input.pointer = params; 117 params[0].type = ACPI_TYPE_BUFFER; 118 params[0].buffer.length = sizeof(nouveau_dsm_muid); 119 params[0].buffer.pointer = (char *)nouveau_dsm_muid; 120 params[1].type = ACPI_TYPE_INTEGER; 121 params[1].integer.value = 0x00000102; 122 params[2].type = ACPI_TYPE_INTEGER; 123 params[2].integer.value = func; 124 params[3].type = ACPI_TYPE_INTEGER; 125 params[3].integer.value = arg; 126 127 err = acpi_evaluate_object(handle, "_DSM", &input, &output); 128 if (err) { 129 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err); 130 return err; 131 } 132 133 obj = (union acpi_object *)output.pointer; 134 135 if (obj->type == ACPI_TYPE_INTEGER) 136 if (obj->integer.value == 0x80000002) 137 return -ENODEV; 138 139 if (obj->type == ACPI_TYPE_BUFFER) { 140 if (obj->buffer.length == 4 && result) { 141 *result = 0; 142 *result |= obj->buffer.pointer[0]; 143 *result |= (obj->buffer.pointer[1] << 8); 144 *result |= (obj->buffer.pointer[2] << 16); 145 *result |= (obj->buffer.pointer[3] << 24); 146 } 147 } 148 149 kfree(output.pointer); 150 return 0; 151 } 152 153 /* Returns 1 if a DSM function is usable and 0 otherwise */ 154 static int nouveau_test_dsm(acpi_handle test_handle, 155 int (*dsm_func)(acpi_handle, int, int, uint32_t *), 156 int sfnc) 157 { 158 u32 result = 0; 159 160 /* Function 0 returns a Buffer containing available functions. The args 161 * parameter is ignored for function 0, so just put 0 in it */ 162 if (dsm_func(test_handle, 0, 0, &result)) 163 return 0; 164 165 /* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If 166 * the n-th bit is enabled, function n is supported */ 167 return result & 1 && result & (1 << sfnc); 168 } 169 170 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id) 171 { 172 mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0); 173 mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0); 174 return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL); 175 } 176 177 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state) 178 { 179 int arg; 180 if (state == VGA_SWITCHEROO_ON) 181 arg = NOUVEAU_DSM_POWER_SPEED; 182 else 183 arg = NOUVEAU_DSM_POWER_STAMINA; 184 nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL); 185 return 0; 186 } 187 188 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id) 189 { 190 /* perhaps the _DSM functions are mutually exclusive, but prepare for 191 * the future */ 192 if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected) 193 return 0; 194 if (id == VGA_SWITCHEROO_IGD) 195 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA); 196 else 197 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED); 198 } 199 200 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id, 201 enum vga_switcheroo_state state) 202 { 203 if (id == VGA_SWITCHEROO_IGD) 204 return 0; 205 206 /* Optimus laptops have the card already disabled in 207 * nouveau_switcheroo_set_state */ 208 if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected) 209 return 0; 210 211 return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state); 212 } 213 214 static int nouveau_dsm_get_client_id(struct pci_dev *pdev) 215 { 216 /* easy option one - intel vendor ID means Integrated */ 217 if (pdev->vendor == PCI_VENDOR_ID_INTEL) 218 return VGA_SWITCHEROO_IGD; 219 220 /* is this device on Bus 0? - this may need improving */ 221 if (pdev->bus->number == 0) 222 return VGA_SWITCHEROO_IGD; 223 224 return VGA_SWITCHEROO_DIS; 225 } 226 227 static struct vga_switcheroo_handler nouveau_dsm_handler = { 228 .switchto = nouveau_dsm_switchto, 229 .power_state = nouveau_dsm_power_state, 230 .get_client_id = nouveau_dsm_get_client_id, 231 }; 232 233 static int nouveau_dsm_pci_probe(struct pci_dev *pdev) 234 { 235 acpi_handle dhandle, nvidia_handle; 236 acpi_status status; 237 int retval = 0; 238 239 dhandle = DEVICE_ACPI_HANDLE(&pdev->dev); 240 if (!dhandle) 241 return false; 242 243 status = acpi_get_handle(dhandle, "_DSM", &nvidia_handle); 244 if (ACPI_FAILURE(status)) { 245 return false; 246 } 247 248 if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER)) 249 retval |= NOUVEAU_DSM_HAS_MUX; 250 251 if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm, 252 NOUVEAU_DSM_OPTIMUS_FN)) 253 retval |= NOUVEAU_DSM_HAS_OPT; 254 255 if (retval) 256 nouveau_dsm_priv.dhandle = dhandle; 257 258 return retval; 259 } 260 261 static bool nouveau_dsm_detect(void) 262 { 263 char acpi_method_name[255] = { 0 }; 264 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; 265 struct pci_dev *pdev = NULL; 266 int has_dsm = 0; 267 int has_optimus = 0; 268 int vga_count = 0; 269 bool guid_valid; 270 int retval; 271 bool ret = false; 272 273 /* lookup the MXM GUID */ 274 guid_valid = mxm_wmi_supported(); 275 276 if (guid_valid) 277 printk("MXM: GUID detected in BIOS\n"); 278 279 /* now do DSM detection */ 280 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 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 if (vga_count == 2 && has_dsm && guid_valid) { 291 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, 292 &buffer); 293 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n", 294 acpi_method_name); 295 nouveau_dsm_priv.dsm_detected = true; 296 ret = true; 297 } 298 299 if (has_optimus == 1) { 300 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, 301 &buffer); 302 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n", 303 acpi_method_name); 304 nouveau_dsm_priv.optimus_detected = true; 305 ret = true; 306 } 307 308 return ret; 309 } 310 311 void nouveau_register_dsm_handler(void) 312 { 313 bool r; 314 315 r = nouveau_dsm_detect(); 316 if (!r) 317 return; 318 319 vga_switcheroo_register_handler(&nouveau_dsm_handler); 320 } 321 322 /* Must be called for Optimus models before the card can be turned off */ 323 void nouveau_switcheroo_optimus_dsm(void) 324 { 325 u32 result = 0; 326 if (!nouveau_dsm_priv.optimus_detected) 327 return; 328 329 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FN, 330 NOUVEAU_DSM_OPTIMUS_ARGS, &result); 331 } 332 333 void nouveau_unregister_dsm_handler(void) 334 { 335 if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected) 336 vga_switcheroo_unregister_handler(); 337 } 338 339 /* retrieve the ROM in 4k blocks */ 340 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios, 341 int offset, int len) 342 { 343 acpi_status status; 344 union acpi_object rom_arg_elements[2], *obj; 345 struct acpi_object_list rom_arg; 346 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL}; 347 348 rom_arg.count = 2; 349 rom_arg.pointer = &rom_arg_elements[0]; 350 351 rom_arg_elements[0].type = ACPI_TYPE_INTEGER; 352 rom_arg_elements[0].integer.value = offset; 353 354 rom_arg_elements[1].type = ACPI_TYPE_INTEGER; 355 rom_arg_elements[1].integer.value = len; 356 357 status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer); 358 if (ACPI_FAILURE(status)) { 359 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status)); 360 return -ENODEV; 361 } 362 obj = (union acpi_object *)buffer.pointer; 363 memcpy(bios+offset, obj->buffer.pointer, len); 364 kfree(buffer.pointer); 365 return len; 366 } 367 368 bool nouveau_acpi_rom_supported(struct pci_dev *pdev) 369 { 370 acpi_status status; 371 acpi_handle dhandle, rom_handle; 372 373 if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected) 374 return false; 375 376 dhandle = DEVICE_ACPI_HANDLE(&pdev->dev); 377 if (!dhandle) 378 return false; 379 380 status = acpi_get_handle(dhandle, "_ROM", &rom_handle); 381 if (ACPI_FAILURE(status)) 382 return false; 383 384 nouveau_dsm_priv.rom_handle = rom_handle; 385 return true; 386 } 387 388 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len) 389 { 390 return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len); 391 } 392 393 int 394 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector) 395 { 396 struct nouveau_connector *nv_connector = nouveau_connector(connector); 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 -EINVAL; 409 } 410 411 handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev); 412 if (!handle) 413 return -ENODEV; 414 415 ret = acpi_bus_get_device(handle, &acpidev); 416 if (ret) 417 return -ENODEV; 418 419 ret = acpi_video_get_edid(acpidev, type, -1, &edid); 420 if (ret < 0) 421 return ret; 422 423 nv_connector->edid = kmemdup(edid, EDID_LENGTH, GFP_KERNEL); 424 return 0; 425 } 426