1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Intel ACPI functions 4 * 5 * _DSM related code stolen from nouveau_acpi.c. 6 */ 7 8 #include <linux/pci.h> 9 #include <linux/acpi.h> 10 #include <acpi/video.h> 11 12 #include "i915_drv.h" 13 #include "intel_acpi.h" 14 #include "intel_display_types.h" 15 16 #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */ 17 #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */ 18 19 static const guid_t intel_dsm_guid = 20 GUID_INIT(0x7ed873d3, 0xc2d0, 0x4e4f, 21 0xa8, 0x54, 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c); 22 23 #define INTEL_DSM_FN_GET_BIOS_DATA_FUNCS_SUPPORTED 0 /* No args */ 24 25 static const guid_t intel_dsm_guid2 = 26 GUID_INIT(0x3e5b41c6, 0xeb1d, 0x4260, 27 0x9d, 0x15, 0xc7, 0x1f, 0xba, 0xda, 0xe4, 0x14); 28 29 static char *intel_dsm_port_name(u8 id) 30 { 31 switch (id) { 32 case 0: 33 return "Reserved"; 34 case 1: 35 return "Analog VGA"; 36 case 2: 37 return "LVDS"; 38 case 3: 39 return "Reserved"; 40 case 4: 41 return "HDMI/DVI_B"; 42 case 5: 43 return "HDMI/DVI_C"; 44 case 6: 45 return "HDMI/DVI_D"; 46 case 7: 47 return "DisplayPort_A"; 48 case 8: 49 return "DisplayPort_B"; 50 case 9: 51 return "DisplayPort_C"; 52 case 0xa: 53 return "DisplayPort_D"; 54 case 0xb: 55 case 0xc: 56 case 0xd: 57 return "Reserved"; 58 case 0xe: 59 return "WiDi"; 60 default: 61 return "bad type"; 62 } 63 } 64 65 static char *intel_dsm_mux_type(u8 type) 66 { 67 switch (type) { 68 case 0: 69 return "unknown"; 70 case 1: 71 return "No MUX, iGPU only"; 72 case 2: 73 return "No MUX, dGPU only"; 74 case 3: 75 return "MUXed between iGPU and dGPU"; 76 default: 77 return "bad type"; 78 } 79 } 80 81 static void intel_dsm_platform_mux_info(acpi_handle dhandle) 82 { 83 int i; 84 union acpi_object *pkg, *connector_count; 85 86 pkg = acpi_evaluate_dsm_typed(dhandle, &intel_dsm_guid, 87 INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO, 88 NULL, ACPI_TYPE_PACKAGE); 89 if (!pkg) { 90 DRM_DEBUG_DRIVER("failed to evaluate _DSM\n"); 91 return; 92 } 93 94 if (!pkg->package.count) { 95 DRM_DEBUG_DRIVER("no connection in _DSM\n"); 96 return; 97 } 98 99 connector_count = &pkg->package.elements[0]; 100 DRM_DEBUG_DRIVER("MUX info connectors: %lld\n", 101 (unsigned long long)connector_count->integer.value); 102 for (i = 1; i < pkg->package.count; i++) { 103 union acpi_object *obj = &pkg->package.elements[i]; 104 union acpi_object *connector_id; 105 union acpi_object *info; 106 107 if (obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) { 108 DRM_DEBUG_DRIVER("Invalid object for MUX #%d\n", i); 109 continue; 110 } 111 112 connector_id = &obj->package.elements[0]; 113 info = &obj->package.elements[1]; 114 if (info->type != ACPI_TYPE_BUFFER || info->buffer.length < 4) { 115 DRM_DEBUG_DRIVER("Invalid info for MUX obj #%d\n", i); 116 continue; 117 } 118 119 DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n", 120 (unsigned long long)connector_id->integer.value); 121 DRM_DEBUG_DRIVER(" port id: %s\n", 122 intel_dsm_port_name(info->buffer.pointer[0])); 123 DRM_DEBUG_DRIVER(" display mux info: %s\n", 124 intel_dsm_mux_type(info->buffer.pointer[1])); 125 DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n", 126 intel_dsm_mux_type(info->buffer.pointer[2])); 127 DRM_DEBUG_DRIVER(" hpd mux info: %s\n", 128 intel_dsm_mux_type(info->buffer.pointer[3])); 129 } 130 131 ACPI_FREE(pkg); 132 } 133 134 static acpi_handle intel_dsm_pci_probe(struct pci_dev *pdev) 135 { 136 acpi_handle dhandle; 137 138 dhandle = ACPI_HANDLE(&pdev->dev); 139 if (!dhandle) 140 return NULL; 141 142 if (!acpi_check_dsm(dhandle, &intel_dsm_guid, INTEL_DSM_REVISION_ID, 143 1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) { 144 DRM_DEBUG_KMS("no _DSM method for intel device\n"); 145 return NULL; 146 } 147 148 intel_dsm_platform_mux_info(dhandle); 149 150 return dhandle; 151 } 152 153 static bool intel_dsm_detect(void) 154 { 155 acpi_handle dhandle = NULL; 156 char acpi_method_name[255] = {}; 157 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; 158 struct pci_dev *pdev = NULL; 159 int vga_count = 0; 160 161 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { 162 vga_count++; 163 dhandle = intel_dsm_pci_probe(pdev) ?: dhandle; 164 } 165 166 if (vga_count == 2 && dhandle) { 167 acpi_get_name(dhandle, ACPI_FULL_PATHNAME, &buffer); 168 DRM_DEBUG_DRIVER("vga_switcheroo: detected DSM switching method %s handle\n", 169 acpi_method_name); 170 return true; 171 } 172 173 return false; 174 } 175 176 void intel_register_dsm_handler(void) 177 { 178 if (!intel_dsm_detect()) 179 return; 180 } 181 182 void intel_unregister_dsm_handler(void) 183 { 184 } 185 186 void intel_dsm_get_bios_data_funcs_supported(struct drm_i915_private *i915) 187 { 188 struct pci_dev *pdev = to_pci_dev(i915->drm.dev); 189 acpi_handle dhandle; 190 union acpi_object *obj; 191 192 dhandle = ACPI_HANDLE(&pdev->dev); 193 if (!dhandle) 194 return; 195 196 obj = acpi_evaluate_dsm(dhandle, &intel_dsm_guid2, INTEL_DSM_REVISION_ID, 197 INTEL_DSM_FN_GET_BIOS_DATA_FUNCS_SUPPORTED, NULL); 198 if (obj) 199 ACPI_FREE(obj); 200 } 201 202 /* 203 * ACPI Specification, Revision 5.0, Appendix B.3.2 _DOD (Enumerate All Devices 204 * Attached to the Display Adapter). 205 */ 206 #define ACPI_DISPLAY_INDEX_SHIFT 0 207 #define ACPI_DISPLAY_INDEX_MASK (0xf << 0) 208 #define ACPI_DISPLAY_PORT_ATTACHMENT_SHIFT 4 209 #define ACPI_DISPLAY_PORT_ATTACHMENT_MASK (0xf << 4) 210 #define ACPI_DISPLAY_TYPE_SHIFT 8 211 #define ACPI_DISPLAY_TYPE_MASK (0xf << 8) 212 #define ACPI_DISPLAY_TYPE_OTHER (0 << 8) 213 #define ACPI_DISPLAY_TYPE_VGA (1 << 8) 214 #define ACPI_DISPLAY_TYPE_TV (2 << 8) 215 #define ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL (3 << 8) 216 #define ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL (4 << 8) 217 #define ACPI_VENDOR_SPECIFIC_SHIFT 12 218 #define ACPI_VENDOR_SPECIFIC_MASK (0xf << 12) 219 #define ACPI_BIOS_CAN_DETECT (1 << 16) 220 #define ACPI_DEPENDS_ON_VGA (1 << 17) 221 #define ACPI_PIPE_ID_SHIFT 18 222 #define ACPI_PIPE_ID_MASK (7 << 18) 223 #define ACPI_DEVICE_ID_SCHEME (1ULL << 31) 224 225 static u32 acpi_display_type(struct intel_connector *connector) 226 { 227 u32 display_type; 228 229 switch (connector->base.connector_type) { 230 case DRM_MODE_CONNECTOR_VGA: 231 case DRM_MODE_CONNECTOR_DVIA: 232 display_type = ACPI_DISPLAY_TYPE_VGA; 233 break; 234 case DRM_MODE_CONNECTOR_Composite: 235 case DRM_MODE_CONNECTOR_SVIDEO: 236 case DRM_MODE_CONNECTOR_Component: 237 case DRM_MODE_CONNECTOR_9PinDIN: 238 case DRM_MODE_CONNECTOR_TV: 239 display_type = ACPI_DISPLAY_TYPE_TV; 240 break; 241 case DRM_MODE_CONNECTOR_DVII: 242 case DRM_MODE_CONNECTOR_DVID: 243 case DRM_MODE_CONNECTOR_DisplayPort: 244 case DRM_MODE_CONNECTOR_HDMIA: 245 case DRM_MODE_CONNECTOR_HDMIB: 246 display_type = ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL; 247 break; 248 case DRM_MODE_CONNECTOR_LVDS: 249 case DRM_MODE_CONNECTOR_eDP: 250 case DRM_MODE_CONNECTOR_DSI: 251 display_type = ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL; 252 break; 253 case DRM_MODE_CONNECTOR_Unknown: 254 case DRM_MODE_CONNECTOR_VIRTUAL: 255 display_type = ACPI_DISPLAY_TYPE_OTHER; 256 break; 257 default: 258 MISSING_CASE(connector->base.connector_type); 259 display_type = ACPI_DISPLAY_TYPE_OTHER; 260 break; 261 } 262 263 return display_type; 264 } 265 266 void intel_acpi_device_id_update(struct drm_i915_private *dev_priv) 267 { 268 struct drm_device *drm_dev = &dev_priv->drm; 269 struct intel_connector *connector; 270 struct drm_connector_list_iter conn_iter; 271 u8 display_index[16] = {}; 272 273 /* Populate the ACPI IDs for all connectors for a given drm_device */ 274 drm_connector_list_iter_begin(drm_dev, &conn_iter); 275 for_each_intel_connector_iter(connector, &conn_iter) { 276 u32 device_id, type; 277 278 device_id = acpi_display_type(connector); 279 280 /* Use display type specific display index. */ 281 type = (device_id & ACPI_DISPLAY_TYPE_MASK) 282 >> ACPI_DISPLAY_TYPE_SHIFT; 283 device_id |= display_index[type]++ << ACPI_DISPLAY_INDEX_SHIFT; 284 285 connector->acpi_device_id = device_id; 286 } 287 drm_connector_list_iter_end(&conn_iter); 288 } 289 290 /* NOTE: The connector order must be final before this is called. */ 291 void intel_acpi_assign_connector_fwnodes(struct drm_i915_private *i915) 292 { 293 struct drm_connector_list_iter conn_iter; 294 struct drm_device *drm_dev = &i915->drm; 295 struct fwnode_handle *fwnode = NULL; 296 struct drm_connector *connector; 297 struct acpi_device *adev; 298 299 drm_connector_list_iter_begin(drm_dev, &conn_iter); 300 drm_for_each_connector_iter(connector, &conn_iter) { 301 /* Always getting the next, even when the last was not used. */ 302 fwnode = device_get_next_child_node(drm_dev->dev, fwnode); 303 if (!fwnode) 304 break; 305 306 switch (connector->connector_type) { 307 case DRM_MODE_CONNECTOR_LVDS: 308 case DRM_MODE_CONNECTOR_eDP: 309 case DRM_MODE_CONNECTOR_DSI: 310 /* 311 * Integrated displays have a specific address 0x1f on 312 * most Intel platforms, but not on all of them. 313 */ 314 adev = acpi_find_child_device(ACPI_COMPANION(drm_dev->dev), 315 0x1f, 0); 316 if (adev) { 317 connector->fwnode = 318 fwnode_handle_get(acpi_fwnode_handle(adev)); 319 break; 320 } 321 fallthrough; 322 default: 323 connector->fwnode = fwnode_handle_get(fwnode); 324 break; 325 } 326 } 327 drm_connector_list_iter_end(&conn_iter); 328 /* 329 * device_get_next_child_node() takes a reference on the fwnode, if 330 * we stopped iterating because we are out of connectors we need to 331 * put this, otherwise fwnode is NULL and the put is a no-op. 332 */ 333 fwnode_handle_put(fwnode); 334 } 335 336 void intel_acpi_video_register(struct drm_i915_private *i915) 337 { 338 struct drm_connector_list_iter conn_iter; 339 struct drm_connector *connector; 340 341 acpi_video_register(); 342 343 /* 344 * If i915 is driving an internal panel without registering its native 345 * backlight handler try to register the acpi_video backlight. 346 * For panels not driven by i915 another GPU driver may still register 347 * a native backlight later and acpi_video_register_backlight() should 348 * only be called after any native backlights have been registered. 349 */ 350 drm_connector_list_iter_begin(&i915->drm, &conn_iter); 351 drm_for_each_connector_iter(connector, &conn_iter) { 352 struct intel_panel *panel = &to_intel_connector(connector)->panel; 353 354 if (panel->backlight.funcs && !panel->backlight.device) { 355 acpi_video_register_backlight(); 356 break; 357 } 358 } 359 drm_connector_list_iter_end(&conn_iter); 360 } 361