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_utils.h" 13 #include "intel_acpi.h" 14 #include "intel_display_core.h" 15 #include "intel_display_types.h" 16 17 #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */ 18 #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */ 19 20 static const guid_t intel_dsm_guid = 21 GUID_INIT(0x7ed873d3, 0xc2d0, 0x4e4f, 22 0xa8, 0x54, 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c); 23 24 #define INTEL_DSM_FN_GET_BIOS_DATA_FUNCS_SUPPORTED 0 /* No args */ 25 26 static const guid_t intel_dsm_guid2 = 27 GUID_INIT(0x3e5b41c6, 0xeb1d, 0x4260, 28 0x9d, 0x15, 0xc7, 0x1f, 0xba, 0xda, 0xe4, 0x14); 29 30 static char *intel_dsm_port_name(u8 id) 31 { 32 switch (id) { 33 case 0: 34 return "Reserved"; 35 case 1: 36 return "Analog VGA"; 37 case 2: 38 return "LVDS"; 39 case 3: 40 return "Reserved"; 41 case 4: 42 return "HDMI/DVI_B"; 43 case 5: 44 return "HDMI/DVI_C"; 45 case 6: 46 return "HDMI/DVI_D"; 47 case 7: 48 return "DisplayPort_A"; 49 case 8: 50 return "DisplayPort_B"; 51 case 9: 52 return "DisplayPort_C"; 53 case 0xa: 54 return "DisplayPort_D"; 55 case 0xb: 56 case 0xc: 57 case 0xd: 58 return "Reserved"; 59 case 0xe: 60 return "WiDi"; 61 default: 62 return "bad type"; 63 } 64 } 65 66 static char *intel_dsm_mux_type(u8 type) 67 { 68 switch (type) { 69 case 0: 70 return "unknown"; 71 case 1: 72 return "No MUX, iGPU only"; 73 case 2: 74 return "No MUX, dGPU only"; 75 case 3: 76 return "MUXed between iGPU and dGPU"; 77 default: 78 return "bad type"; 79 } 80 } 81 82 static void intel_dsm_platform_mux_info(acpi_handle dhandle) 83 { 84 int i; 85 union acpi_object *pkg, *connector_count; 86 87 pkg = acpi_evaluate_dsm_typed(dhandle, &intel_dsm_guid, 88 INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO, 89 NULL, ACPI_TYPE_PACKAGE); 90 if (!pkg) { 91 DRM_DEBUG_DRIVER("failed to evaluate _DSM\n"); 92 return; 93 } 94 95 if (!pkg->package.count) { 96 DRM_DEBUG_DRIVER("no connection in _DSM\n"); 97 return; 98 } 99 100 connector_count = &pkg->package.elements[0]; 101 DRM_DEBUG_DRIVER("MUX info connectors: %lld\n", 102 (unsigned long long)connector_count->integer.value); 103 for (i = 1; i < pkg->package.count; i++) { 104 union acpi_object *obj = &pkg->package.elements[i]; 105 union acpi_object *connector_id; 106 union acpi_object *info; 107 108 if (obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) { 109 DRM_DEBUG_DRIVER("Invalid object for MUX #%d\n", i); 110 continue; 111 } 112 113 connector_id = &obj->package.elements[0]; 114 info = &obj->package.elements[1]; 115 if (info->type != ACPI_TYPE_BUFFER || info->buffer.length < 4) { 116 DRM_DEBUG_DRIVER("Invalid info for MUX obj #%d\n", i); 117 continue; 118 } 119 120 DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n", 121 (unsigned long long)connector_id->integer.value); 122 DRM_DEBUG_DRIVER(" port id: %s\n", 123 intel_dsm_port_name(info->buffer.pointer[0])); 124 DRM_DEBUG_DRIVER(" display mux info: %s\n", 125 intel_dsm_mux_type(info->buffer.pointer[1])); 126 DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n", 127 intel_dsm_mux_type(info->buffer.pointer[2])); 128 DRM_DEBUG_DRIVER(" hpd mux info: %s\n", 129 intel_dsm_mux_type(info->buffer.pointer[3])); 130 } 131 132 ACPI_FREE(pkg); 133 } 134 135 static acpi_handle intel_dsm_pci_probe(struct pci_dev *pdev) 136 { 137 acpi_handle dhandle; 138 139 dhandle = ACPI_HANDLE(&pdev->dev); 140 if (!dhandle) 141 return NULL; 142 143 if (!acpi_check_dsm(dhandle, &intel_dsm_guid, INTEL_DSM_REVISION_ID, 144 1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) { 145 DRM_DEBUG_KMS("no _DSM method for intel device\n"); 146 return NULL; 147 } 148 149 intel_dsm_platform_mux_info(dhandle); 150 151 return dhandle; 152 } 153 154 static bool intel_dsm_detect(void) 155 { 156 acpi_handle dhandle = NULL; 157 char acpi_method_name[255] = {}; 158 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; 159 struct pci_dev *pdev = NULL; 160 int vga_count = 0; 161 162 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { 163 vga_count++; 164 dhandle = intel_dsm_pci_probe(pdev) ?: dhandle; 165 } 166 167 if (vga_count == 2 && dhandle) { 168 acpi_get_name(dhandle, ACPI_FULL_PATHNAME, &buffer); 169 DRM_DEBUG_DRIVER("vga_switcheroo: detected DSM switching method %s handle\n", 170 acpi_method_name); 171 return true; 172 } 173 174 return false; 175 } 176 177 void intel_register_dsm_handler(void) 178 { 179 if (!intel_dsm_detect()) 180 return; 181 } 182 183 void intel_unregister_dsm_handler(void) 184 { 185 } 186 187 void intel_dsm_get_bios_data_funcs_supported(struct intel_display *display) 188 { 189 struct pci_dev *pdev = to_pci_dev(display->drm->dev); 190 acpi_handle dhandle; 191 union acpi_object *obj; 192 193 dhandle = ACPI_HANDLE(&pdev->dev); 194 if (!dhandle) 195 return; 196 197 obj = acpi_evaluate_dsm(dhandle, &intel_dsm_guid2, INTEL_DSM_REVISION_ID, 198 INTEL_DSM_FN_GET_BIOS_DATA_FUNCS_SUPPORTED, NULL); 199 if (obj) 200 ACPI_FREE(obj); 201 } 202 203 /* 204 * ACPI Specification, Revision 5.0, Appendix B.3.2 _DOD (Enumerate All Devices 205 * Attached to the Display Adapter). 206 */ 207 #define ACPI_DISPLAY_INDEX_SHIFT 0 208 #define ACPI_DISPLAY_INDEX_MASK (0xf << 0) 209 #define ACPI_DISPLAY_PORT_ATTACHMENT_SHIFT 4 210 #define ACPI_DISPLAY_PORT_ATTACHMENT_MASK (0xf << 4) 211 #define ACPI_DISPLAY_TYPE_SHIFT 8 212 #define ACPI_DISPLAY_TYPE_MASK (0xf << 8) 213 #define ACPI_DISPLAY_TYPE_OTHER (0 << 8) 214 #define ACPI_DISPLAY_TYPE_VGA (1 << 8) 215 #define ACPI_DISPLAY_TYPE_TV (2 << 8) 216 #define ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL (3 << 8) 217 #define ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL (4 << 8) 218 #define ACPI_VENDOR_SPECIFIC_SHIFT 12 219 #define ACPI_VENDOR_SPECIFIC_MASK (0xf << 12) 220 #define ACPI_BIOS_CAN_DETECT (1 << 16) 221 #define ACPI_DEPENDS_ON_VGA (1 << 17) 222 #define ACPI_PIPE_ID_SHIFT 18 223 #define ACPI_PIPE_ID_MASK (7 << 18) 224 #define ACPI_DEVICE_ID_SCHEME (1ULL << 31) 225 226 static u32 acpi_display_type(struct intel_connector *connector) 227 { 228 u32 display_type; 229 230 switch (connector->base.connector_type) { 231 case DRM_MODE_CONNECTOR_VGA: 232 case DRM_MODE_CONNECTOR_DVIA: 233 display_type = ACPI_DISPLAY_TYPE_VGA; 234 break; 235 case DRM_MODE_CONNECTOR_Composite: 236 case DRM_MODE_CONNECTOR_SVIDEO: 237 case DRM_MODE_CONNECTOR_Component: 238 case DRM_MODE_CONNECTOR_9PinDIN: 239 case DRM_MODE_CONNECTOR_TV: 240 display_type = ACPI_DISPLAY_TYPE_TV; 241 break; 242 case DRM_MODE_CONNECTOR_DVII: 243 case DRM_MODE_CONNECTOR_DVID: 244 case DRM_MODE_CONNECTOR_DisplayPort: 245 case DRM_MODE_CONNECTOR_HDMIA: 246 case DRM_MODE_CONNECTOR_HDMIB: 247 display_type = ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL; 248 break; 249 case DRM_MODE_CONNECTOR_LVDS: 250 case DRM_MODE_CONNECTOR_eDP: 251 case DRM_MODE_CONNECTOR_DSI: 252 display_type = ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL; 253 break; 254 case DRM_MODE_CONNECTOR_Unknown: 255 case DRM_MODE_CONNECTOR_VIRTUAL: 256 display_type = ACPI_DISPLAY_TYPE_OTHER; 257 break; 258 default: 259 MISSING_CASE(connector->base.connector_type); 260 display_type = ACPI_DISPLAY_TYPE_OTHER; 261 break; 262 } 263 264 return display_type; 265 } 266 267 void intel_acpi_device_id_update(struct intel_display *display) 268 { 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(display->drm, &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 intel_display *display) 292 { 293 struct drm_device *drm_dev = display->drm; 294 struct drm_connector_list_iter conn_iter; 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 intel_display *display) 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(display->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