1 // SPDX-License-Identifier: MIT 2 #include <linux/pci.h> 3 #include <linux/acpi.h> 4 #include <linux/slab.h> 5 #include <linux/mxm-wmi.h> 6 #include <linux/vga_switcheroo.h> 7 #include <drm/drm_edid.h> 8 #include <acpi/video.h> 9 10 #include "nouveau_drv.h" 11 #include "nouveau_acpi.h" 12 13 #define NOUVEAU_DSM_LED 0x02 14 #define NOUVEAU_DSM_LED_STATE 0x00 15 #define NOUVEAU_DSM_LED_OFF 0x10 16 #define NOUVEAU_DSM_LED_STAMINA 0x11 17 #define NOUVEAU_DSM_LED_SPEED 0x12 18 19 #define NOUVEAU_DSM_POWER 0x03 20 #define NOUVEAU_DSM_POWER_STATE 0x00 21 #define NOUVEAU_DSM_POWER_SPEED 0x01 22 #define NOUVEAU_DSM_POWER_STAMINA 0x02 23 24 #define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A 25 #define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B 26 27 #define NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 (3 << 24) 28 #define NOUVEAU_DSM_OPTIMUS_NO_POWERDOWN_PS3 (2 << 24) 29 #define NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED (1) 30 31 #define NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN (NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 | NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED) 32 33 /* result of the optimus caps function */ 34 #define OPTIMUS_ENABLED (1 << 0) 35 #define OPTIMUS_STATUS_MASK (3 << 3) 36 #define OPTIMUS_STATUS_OFF (0 << 3) 37 #define OPTIMUS_STATUS_ON_ENABLED (1 << 3) 38 #define OPTIMUS_STATUS_PWR_STABLE (3 << 3) 39 #define OPTIMUS_DISPLAY_HOTPLUG (1 << 6) 40 #define OPTIMUS_CAPS_MASK (7 << 24) 41 #define OPTIMUS_DYNAMIC_PWR_CAP (1 << 24) 42 43 #define OPTIMUS_AUDIO_CAPS_MASK (3 << 27) 44 #define OPTIMUS_HDA_CODEC_MASK (2 << 27) /* hda bios control */ 45 46 static struct nouveau_dsm_priv { 47 bool dsm_detected; 48 bool optimus_detected; 49 bool optimus_flags_detected; 50 bool optimus_skip_dsm; 51 acpi_handle dhandle; 52 } nouveau_dsm_priv; 53 54 bool nouveau_is_optimus(void) { 55 return nouveau_dsm_priv.optimus_detected; 56 } 57 58 bool nouveau_is_v1_dsm(void) { 59 return nouveau_dsm_priv.dsm_detected; 60 } 61 62 #ifdef CONFIG_VGA_SWITCHEROO 63 static const guid_t nouveau_dsm_muid = 64 GUID_INIT(0x9D95A0A0, 0x0060, 0x4D48, 65 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4); 66 67 static const guid_t nouveau_op_dsm_muid = 68 GUID_INIT(0xA486D8F8, 0x0BDA, 0x471B, 69 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0); 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 enum vga_switcheroo_client_id 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 bool *has_opt_flags, bool *has_pr3) 217 { 218 acpi_handle dhandle; 219 bool supports_mux; 220 int optimus_funcs; 221 struct pci_dev *parent_pdev; 222 223 if (pdev->vendor != PCI_VENDOR_ID_NVIDIA) 224 return; 225 226 *has_pr3 = false; 227 parent_pdev = pci_upstream_bridge(pdev); 228 if (parent_pdev) { 229 if (parent_pdev->bridge_d3) 230 *has_pr3 = pci_pr3_present(parent_pdev); 231 else 232 pci_d3cold_disable(pdev); 233 } 234 235 dhandle = ACPI_HANDLE(&pdev->dev); 236 if (!dhandle) 237 return; 238 239 if (!acpi_has_method(dhandle, "_DSM")) 240 return; 241 242 supports_mux = acpi_check_dsm(dhandle, &nouveau_dsm_muid, 0x00000102, 243 1 << NOUVEAU_DSM_POWER); 244 optimus_funcs = nouveau_dsm_get_optimus_functions(dhandle); 245 246 /* Does not look like a Nvidia device. */ 247 if (!supports_mux && !optimus_funcs) 248 return; 249 250 *dhandle_out = dhandle; 251 *has_mux = supports_mux; 252 *has_opt = !!optimus_funcs; 253 *has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS); 254 255 if (optimus_funcs) { 256 uint32_t result; 257 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0, 258 &result); 259 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n", 260 (result & OPTIMUS_ENABLED) ? "enabled" : "disabled", 261 (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "", 262 (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : ""); 263 } 264 } 265 266 static bool nouveau_dsm_detect(void) 267 { 268 char acpi_method_name[255] = { 0 }; 269 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; 270 struct pci_dev *pdev = NULL; 271 acpi_handle dhandle = NULL; 272 bool has_mux = false; 273 bool has_optimus = false; 274 bool has_optimus_flags = false; 275 bool has_power_resources = false; 276 int vga_count = 0; 277 bool guid_valid; 278 bool ret = false; 279 280 /* lookup the MXM GUID */ 281 guid_valid = mxm_wmi_supported(); 282 283 if (guid_valid) 284 printk("MXM: GUID detected in BIOS\n"); 285 286 /* now do DSM detection */ 287 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { 288 vga_count++; 289 290 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus, 291 &has_optimus_flags, &has_power_resources); 292 } 293 294 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) { 295 vga_count++; 296 297 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus, 298 &has_optimus_flags, &has_power_resources); 299 } 300 301 /* find the optimus DSM or the old v1 DSM */ 302 if (has_optimus) { 303 nouveau_dsm_priv.dhandle = dhandle; 304 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, 305 &buffer); 306 pr_info("VGA switcheroo: detected Optimus DSM method %s handle\n", 307 acpi_method_name); 308 if (has_power_resources) 309 pr_info("nouveau: detected PR support, will not use DSM\n"); 310 nouveau_dsm_priv.optimus_detected = true; 311 nouveau_dsm_priv.optimus_flags_detected = has_optimus_flags; 312 nouveau_dsm_priv.optimus_skip_dsm = has_power_resources; 313 ret = true; 314 } else if (vga_count == 2 && has_mux && guid_valid) { 315 nouveau_dsm_priv.dhandle = dhandle; 316 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, 317 &buffer); 318 pr_info("VGA switcheroo: detected DSM switching method %s handle\n", 319 acpi_method_name); 320 nouveau_dsm_priv.dsm_detected = true; 321 ret = true; 322 } 323 324 325 return ret; 326 } 327 328 void nouveau_register_dsm_handler(void) 329 { 330 bool r; 331 332 r = nouveau_dsm_detect(); 333 if (!r) 334 return; 335 336 vga_switcheroo_register_handler(&nouveau_dsm_handler, 0); 337 } 338 339 /* Must be called for Optimus models before the card can be turned off */ 340 void nouveau_switcheroo_optimus_dsm(void) 341 { 342 u32 result = 0; 343 if (!nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.optimus_skip_dsm) 344 return; 345 346 if (nouveau_dsm_priv.optimus_flags_detected) 347 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS, 348 0x3, &result); 349 350 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 351 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result); 352 353 } 354 355 void nouveau_unregister_dsm_handler(void) 356 { 357 if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected) 358 vga_switcheroo_unregister_handler(); 359 } 360 #else 361 void nouveau_register_dsm_handler(void) {} 362 void nouveau_unregister_dsm_handler(void) {} 363 void nouveau_switcheroo_optimus_dsm(void) {} 364 #endif 365 366 void * 367 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector) 368 { 369 struct acpi_device *acpidev; 370 int type, ret; 371 void *edid; 372 373 switch (connector->connector_type) { 374 case DRM_MODE_CONNECTOR_LVDS: 375 case DRM_MODE_CONNECTOR_eDP: 376 type = ACPI_VIDEO_DISPLAY_LCD; 377 break; 378 default: 379 return NULL; 380 } 381 382 acpidev = ACPI_COMPANION(dev->dev); 383 if (!acpidev) 384 return NULL; 385 386 ret = acpi_video_get_edid(acpidev, type, -1, &edid); 387 if (ret < 0) 388 return NULL; 389 390 return kmemdup(edid, EDID_LENGTH, GFP_KERNEL); 391 } 392 393 bool nouveau_acpi_video_backlight_use_native(void) 394 { 395 return acpi_video_backlight_use_native(); 396 } 397 398 void nouveau_acpi_video_register_backlight(void) 399 { 400 acpi_video_register_backlight(); 401 } 402