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 <drm/drm_print.h> 13 14 #include "intel_acpi.h" 15 #include "intel_display_core.h" 16 #include "intel_display_types.h" 17 #include "intel_display_utils.h" 18 19 #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */ 20 #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */ 21 22 static const guid_t intel_dsm_guid = 23 GUID_INIT(0x7ed873d3, 0xc2d0, 0x4e4f, 24 0xa8, 0x54, 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c); 25 26 #define INTEL_DSM_FN_GET_BIOS_DATA_FUNCS_SUPPORTED 0 /* No args */ 27 28 static const guid_t intel_dsm_guid2 = 29 GUID_INIT(0x3e5b41c6, 0xeb1d, 0x4260, 30 0x9d, 0x15, 0xc7, 0x1f, 0xba, 0xda, 0xe4, 0x14); 31 32 static char *intel_dsm_port_name(u8 id) 33 { 34 switch (id) { 35 case 0: 36 return "Reserved"; 37 case 1: 38 return "Analog VGA"; 39 case 2: 40 return "LVDS"; 41 case 3: 42 return "Reserved"; 43 case 4: 44 return "HDMI/DVI_B"; 45 case 5: 46 return "HDMI/DVI_C"; 47 case 6: 48 return "HDMI/DVI_D"; 49 case 7: 50 return "DisplayPort_A"; 51 case 8: 52 return "DisplayPort_B"; 53 case 9: 54 return "DisplayPort_C"; 55 case 0xa: 56 return "DisplayPort_D"; 57 case 0xb: 58 case 0xc: 59 case 0xd: 60 return "Reserved"; 61 case 0xe: 62 return "WiDi"; 63 default: 64 return "bad type"; 65 } 66 } 67 68 static char *intel_dsm_mux_type(u8 type) 69 { 70 switch (type) { 71 case 0: 72 return "unknown"; 73 case 1: 74 return "No MUX, iGPU only"; 75 case 2: 76 return "No MUX, dGPU only"; 77 case 3: 78 return "MUXed between iGPU and dGPU"; 79 default: 80 return "bad type"; 81 } 82 } 83 84 static void intel_dsm_platform_mux_info(acpi_handle dhandle) 85 { 86 int i; 87 union acpi_object *pkg, *connector_count; 88 89 pkg = acpi_evaluate_dsm_typed(dhandle, &intel_dsm_guid, 90 INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO, 91 NULL, ACPI_TYPE_PACKAGE); 92 if (!pkg) { 93 DRM_DEBUG_DRIVER("failed to evaluate _DSM\n"); 94 return; 95 } 96 97 if (!pkg->package.count) { 98 DRM_DEBUG_DRIVER("no connection in _DSM\n"); 99 ACPI_FREE(pkg); 100 return; 101 } 102 103 connector_count = &pkg->package.elements[0]; 104 DRM_DEBUG_DRIVER("MUX info connectors: %lld\n", 105 (unsigned long long)connector_count->integer.value); 106 for (i = 1; i < pkg->package.count; i++) { 107 union acpi_object *obj = &pkg->package.elements[i]; 108 union acpi_object *connector_id; 109 union acpi_object *info; 110 111 if (obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) { 112 DRM_DEBUG_DRIVER("Invalid object for MUX #%d\n", i); 113 continue; 114 } 115 116 connector_id = &obj->package.elements[0]; 117 info = &obj->package.elements[1]; 118 if (info->type != ACPI_TYPE_BUFFER || info->buffer.length < 4) { 119 DRM_DEBUG_DRIVER("Invalid info for MUX obj #%d\n", i); 120 continue; 121 } 122 123 DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n", 124 (unsigned long long)connector_id->integer.value); 125 DRM_DEBUG_DRIVER(" port id: %s\n", 126 intel_dsm_port_name(info->buffer.pointer[0])); 127 DRM_DEBUG_DRIVER(" display mux info: %s\n", 128 intel_dsm_mux_type(info->buffer.pointer[1])); 129 DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n", 130 intel_dsm_mux_type(info->buffer.pointer[2])); 131 DRM_DEBUG_DRIVER(" hpd mux info: %s\n", 132 intel_dsm_mux_type(info->buffer.pointer[3])); 133 } 134 135 ACPI_FREE(pkg); 136 } 137 138 static acpi_handle intel_dsm_pci_probe(struct pci_dev *pdev) 139 { 140 acpi_handle dhandle; 141 142 dhandle = ACPI_HANDLE(&pdev->dev); 143 if (!dhandle) 144 return NULL; 145 146 if (!acpi_check_dsm(dhandle, &intel_dsm_guid, INTEL_DSM_REVISION_ID, 147 1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) { 148 DRM_DEBUG_KMS("no _DSM method for intel device\n"); 149 return NULL; 150 } 151 152 intel_dsm_platform_mux_info(dhandle); 153 154 return dhandle; 155 } 156 157 static bool intel_dsm_detect(void) 158 { 159 acpi_handle dhandle = NULL; 160 char acpi_method_name[255] = {}; 161 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; 162 struct pci_dev *pdev = NULL; 163 int vga_count = 0; 164 165 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { 166 vga_count++; 167 dhandle = intel_dsm_pci_probe(pdev) ?: dhandle; 168 } 169 170 if (vga_count == 2 && dhandle) { 171 acpi_get_name(dhandle, ACPI_FULL_PATHNAME, &buffer); 172 DRM_DEBUG_DRIVER("vga_switcheroo: detected DSM switching method %s handle\n", 173 acpi_method_name); 174 return true; 175 } 176 177 return false; 178 } 179 180 void intel_register_dsm_handler(void) 181 { 182 if (!intel_dsm_detect()) 183 return; 184 } 185 186 void intel_unregister_dsm_handler(void) 187 { 188 } 189 190 void intel_dsm_get_bios_data_funcs_supported(struct intel_display *display) 191 { 192 struct pci_dev *pdev = to_pci_dev(display->drm->dev); 193 acpi_handle dhandle; 194 union acpi_object *obj; 195 196 dhandle = ACPI_HANDLE(&pdev->dev); 197 if (!dhandle) 198 return; 199 200 obj = acpi_evaluate_dsm(dhandle, &intel_dsm_guid2, INTEL_DSM_REVISION_ID, 201 INTEL_DSM_FN_GET_BIOS_DATA_FUNCS_SUPPORTED, NULL); 202 if (obj) 203 ACPI_FREE(obj); 204 } 205 206 /* 207 * ACPI Specification, Revision 5.0, Appendix B.3.2 _DOD (Enumerate All Devices 208 * Attached to the Display Adapter). 209 */ 210 #define ACPI_DISPLAY_INDEX_SHIFT 0 211 #define ACPI_DISPLAY_INDEX_MASK (0xf << 0) 212 #define ACPI_DISPLAY_PORT_ATTACHMENT_SHIFT 4 213 #define ACPI_DISPLAY_PORT_ATTACHMENT_MASK (0xf << 4) 214 #define ACPI_DISPLAY_TYPE_SHIFT 8 215 #define ACPI_DISPLAY_TYPE_MASK (0xf << 8) 216 #define ACPI_DISPLAY_TYPE_OTHER (0 << 8) 217 #define ACPI_DISPLAY_TYPE_VGA (1 << 8) 218 #define ACPI_DISPLAY_TYPE_TV (2 << 8) 219 #define ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL (3 << 8) 220 #define ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL (4 << 8) 221 #define ACPI_VENDOR_SPECIFIC_SHIFT 12 222 #define ACPI_VENDOR_SPECIFIC_MASK (0xf << 12) 223 #define ACPI_BIOS_CAN_DETECT (1 << 16) 224 #define ACPI_DEPENDS_ON_VGA (1 << 17) 225 #define ACPI_PIPE_ID_SHIFT 18 226 #define ACPI_PIPE_ID_MASK (7 << 18) 227 #define ACPI_DEVICE_ID_SCHEME (1ULL << 31) 228 229 static u32 acpi_display_type(struct intel_connector *connector) 230 { 231 u32 display_type; 232 233 switch (connector->base.connector_type) { 234 case DRM_MODE_CONNECTOR_VGA: 235 case DRM_MODE_CONNECTOR_DVIA: 236 display_type = ACPI_DISPLAY_TYPE_VGA; 237 break; 238 case DRM_MODE_CONNECTOR_Composite: 239 case DRM_MODE_CONNECTOR_SVIDEO: 240 case DRM_MODE_CONNECTOR_Component: 241 case DRM_MODE_CONNECTOR_9PinDIN: 242 case DRM_MODE_CONNECTOR_TV: 243 display_type = ACPI_DISPLAY_TYPE_TV; 244 break; 245 case DRM_MODE_CONNECTOR_DVII: 246 case DRM_MODE_CONNECTOR_DVID: 247 case DRM_MODE_CONNECTOR_DisplayPort: 248 case DRM_MODE_CONNECTOR_HDMIA: 249 case DRM_MODE_CONNECTOR_HDMIB: 250 display_type = ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL; 251 break; 252 case DRM_MODE_CONNECTOR_LVDS: 253 case DRM_MODE_CONNECTOR_eDP: 254 case DRM_MODE_CONNECTOR_DSI: 255 display_type = ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL; 256 break; 257 case DRM_MODE_CONNECTOR_Unknown: 258 case DRM_MODE_CONNECTOR_VIRTUAL: 259 display_type = ACPI_DISPLAY_TYPE_OTHER; 260 break; 261 default: 262 MISSING_CASE(connector->base.connector_type); 263 display_type = ACPI_DISPLAY_TYPE_OTHER; 264 break; 265 } 266 267 return display_type; 268 } 269 270 void intel_acpi_device_id_update(struct intel_display *display) 271 { 272 struct intel_connector *connector; 273 struct drm_connector_list_iter conn_iter; 274 u8 display_index[16] = {}; 275 276 /* Populate the ACPI IDs for all connectors for a given drm_device */ 277 drm_connector_list_iter_begin(display->drm, &conn_iter); 278 for_each_intel_connector_iter(connector, &conn_iter) { 279 u32 device_id, type; 280 281 device_id = acpi_display_type(connector); 282 283 /* Use display type specific display index. */ 284 type = (device_id & ACPI_DISPLAY_TYPE_MASK) 285 >> ACPI_DISPLAY_TYPE_SHIFT; 286 device_id |= display_index[type]++ << ACPI_DISPLAY_INDEX_SHIFT; 287 288 connector->acpi_device_id = device_id; 289 } 290 drm_connector_list_iter_end(&conn_iter); 291 } 292 293 /* NOTE: The connector order must be final before this is called. */ 294 void intel_acpi_assign_connector_fwnodes(struct intel_display *display) 295 { 296 struct drm_device *drm_dev = display->drm; 297 struct drm_connector_list_iter conn_iter; 298 struct fwnode_handle *fwnode = NULL; 299 struct drm_connector *connector; 300 struct acpi_device *adev; 301 302 drm_connector_list_iter_begin(drm_dev, &conn_iter); 303 drm_for_each_connector_iter(connector, &conn_iter) { 304 /* Always getting the next, even when the last was not used. */ 305 fwnode = device_get_next_child_node(drm_dev->dev, fwnode); 306 if (!fwnode) 307 break; 308 309 switch (connector->connector_type) { 310 case DRM_MODE_CONNECTOR_LVDS: 311 case DRM_MODE_CONNECTOR_eDP: 312 case DRM_MODE_CONNECTOR_DSI: 313 /* 314 * Integrated displays have a specific address 0x1f on 315 * most Intel platforms, but not on all of them. 316 */ 317 adev = acpi_find_child_device(ACPI_COMPANION(drm_dev->dev), 318 0x1f, 0); 319 if (adev) { 320 connector->fwnode = 321 fwnode_handle_get(acpi_fwnode_handle(adev)); 322 break; 323 } 324 fallthrough; 325 default: 326 connector->fwnode = fwnode_handle_get(fwnode); 327 break; 328 } 329 } 330 drm_connector_list_iter_end(&conn_iter); 331 /* 332 * device_get_next_child_node() takes a reference on the fwnode, if 333 * we stopped iterating because we are out of connectors we need to 334 * put this, otherwise fwnode is NULL and the put is a no-op. 335 */ 336 fwnode_handle_put(fwnode); 337 } 338 339 void intel_acpi_video_register(struct intel_display *display) 340 { 341 struct drm_connector_list_iter conn_iter; 342 struct drm_connector *connector; 343 344 acpi_video_register(); 345 346 /* 347 * If i915 is driving an internal panel without registering its native 348 * backlight handler try to register the acpi_video backlight. 349 * For panels not driven by i915 another GPU driver may still register 350 * a native backlight later and acpi_video_register_backlight() should 351 * only be called after any native backlights have been registered. 352 */ 353 drm_connector_list_iter_begin(display->drm, &conn_iter); 354 drm_for_each_connector_iter(connector, &conn_iter) { 355 struct intel_panel *panel = &to_intel_connector(connector)->panel; 356 357 if (panel->backlight.funcs && !panel->backlight.device) { 358 acpi_video_register_backlight(); 359 break; 360 } 361 } 362 drm_connector_list_iter_end(&conn_iter); 363 } 364