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 "i915_utils.h" 15 #include "intel_acpi.h" 16 #include "intel_display_core.h" 17 #include "intel_display_types.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 return; 100 } 101 102 connector_count = &pkg->package.elements[0]; 103 DRM_DEBUG_DRIVER("MUX info connectors: %lld\n", 104 (unsigned long long)connector_count->integer.value); 105 for (i = 1; i < pkg->package.count; i++) { 106 union acpi_object *obj = &pkg->package.elements[i]; 107 union acpi_object *connector_id; 108 union acpi_object *info; 109 110 if (obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) { 111 DRM_DEBUG_DRIVER("Invalid object for MUX #%d\n", i); 112 continue; 113 } 114 115 connector_id = &obj->package.elements[0]; 116 info = &obj->package.elements[1]; 117 if (info->type != ACPI_TYPE_BUFFER || info->buffer.length < 4) { 118 DRM_DEBUG_DRIVER("Invalid info for MUX obj #%d\n", i); 119 continue; 120 } 121 122 DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n", 123 (unsigned long long)connector_id->integer.value); 124 DRM_DEBUG_DRIVER(" port id: %s\n", 125 intel_dsm_port_name(info->buffer.pointer[0])); 126 DRM_DEBUG_DRIVER(" display mux info: %s\n", 127 intel_dsm_mux_type(info->buffer.pointer[1])); 128 DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n", 129 intel_dsm_mux_type(info->buffer.pointer[2])); 130 DRM_DEBUG_DRIVER(" hpd mux info: %s\n", 131 intel_dsm_mux_type(info->buffer.pointer[3])); 132 } 133 134 ACPI_FREE(pkg); 135 } 136 137 static acpi_handle intel_dsm_pci_probe(struct pci_dev *pdev) 138 { 139 acpi_handle dhandle; 140 141 dhandle = ACPI_HANDLE(&pdev->dev); 142 if (!dhandle) 143 return NULL; 144 145 if (!acpi_check_dsm(dhandle, &intel_dsm_guid, INTEL_DSM_REVISION_ID, 146 1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) { 147 DRM_DEBUG_KMS("no _DSM method for intel device\n"); 148 return NULL; 149 } 150 151 intel_dsm_platform_mux_info(dhandle); 152 153 return dhandle; 154 } 155 156 static bool intel_dsm_detect(void) 157 { 158 acpi_handle dhandle = NULL; 159 char acpi_method_name[255] = {}; 160 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; 161 struct pci_dev *pdev = NULL; 162 int vga_count = 0; 163 164 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { 165 vga_count++; 166 dhandle = intel_dsm_pci_probe(pdev) ?: dhandle; 167 } 168 169 if (vga_count == 2 && dhandle) { 170 acpi_get_name(dhandle, ACPI_FULL_PATHNAME, &buffer); 171 DRM_DEBUG_DRIVER("vga_switcheroo: detected DSM switching method %s handle\n", 172 acpi_method_name); 173 return true; 174 } 175 176 return false; 177 } 178 179 void intel_register_dsm_handler(void) 180 { 181 if (!intel_dsm_detect()) 182 return; 183 } 184 185 void intel_unregister_dsm_handler(void) 186 { 187 } 188 189 void intel_dsm_get_bios_data_funcs_supported(struct intel_display *display) 190 { 191 struct pci_dev *pdev = to_pci_dev(display->drm->dev); 192 acpi_handle dhandle; 193 union acpi_object *obj; 194 195 dhandle = ACPI_HANDLE(&pdev->dev); 196 if (!dhandle) 197 return; 198 199 obj = acpi_evaluate_dsm(dhandle, &intel_dsm_guid2, INTEL_DSM_REVISION_ID, 200 INTEL_DSM_FN_GET_BIOS_DATA_FUNCS_SUPPORTED, NULL); 201 if (obj) 202 ACPI_FREE(obj); 203 } 204 205 /* 206 * ACPI Specification, Revision 5.0, Appendix B.3.2 _DOD (Enumerate All Devices 207 * Attached to the Display Adapter). 208 */ 209 #define ACPI_DISPLAY_INDEX_SHIFT 0 210 #define ACPI_DISPLAY_INDEX_MASK (0xf << 0) 211 #define ACPI_DISPLAY_PORT_ATTACHMENT_SHIFT 4 212 #define ACPI_DISPLAY_PORT_ATTACHMENT_MASK (0xf << 4) 213 #define ACPI_DISPLAY_TYPE_SHIFT 8 214 #define ACPI_DISPLAY_TYPE_MASK (0xf << 8) 215 #define ACPI_DISPLAY_TYPE_OTHER (0 << 8) 216 #define ACPI_DISPLAY_TYPE_VGA (1 << 8) 217 #define ACPI_DISPLAY_TYPE_TV (2 << 8) 218 #define ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL (3 << 8) 219 #define ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL (4 << 8) 220 #define ACPI_VENDOR_SPECIFIC_SHIFT 12 221 #define ACPI_VENDOR_SPECIFIC_MASK (0xf << 12) 222 #define ACPI_BIOS_CAN_DETECT (1 << 16) 223 #define ACPI_DEPENDS_ON_VGA (1 << 17) 224 #define ACPI_PIPE_ID_SHIFT 18 225 #define ACPI_PIPE_ID_MASK (7 << 18) 226 #define ACPI_DEVICE_ID_SCHEME (1ULL << 31) 227 228 static u32 acpi_display_type(struct intel_connector *connector) 229 { 230 u32 display_type; 231 232 switch (connector->base.connector_type) { 233 case DRM_MODE_CONNECTOR_VGA: 234 case DRM_MODE_CONNECTOR_DVIA: 235 display_type = ACPI_DISPLAY_TYPE_VGA; 236 break; 237 case DRM_MODE_CONNECTOR_Composite: 238 case DRM_MODE_CONNECTOR_SVIDEO: 239 case DRM_MODE_CONNECTOR_Component: 240 case DRM_MODE_CONNECTOR_9PinDIN: 241 case DRM_MODE_CONNECTOR_TV: 242 display_type = ACPI_DISPLAY_TYPE_TV; 243 break; 244 case DRM_MODE_CONNECTOR_DVII: 245 case DRM_MODE_CONNECTOR_DVID: 246 case DRM_MODE_CONNECTOR_DisplayPort: 247 case DRM_MODE_CONNECTOR_HDMIA: 248 case DRM_MODE_CONNECTOR_HDMIB: 249 display_type = ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL; 250 break; 251 case DRM_MODE_CONNECTOR_LVDS: 252 case DRM_MODE_CONNECTOR_eDP: 253 case DRM_MODE_CONNECTOR_DSI: 254 display_type = ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL; 255 break; 256 case DRM_MODE_CONNECTOR_Unknown: 257 case DRM_MODE_CONNECTOR_VIRTUAL: 258 display_type = ACPI_DISPLAY_TYPE_OTHER; 259 break; 260 default: 261 MISSING_CASE(connector->base.connector_type); 262 display_type = ACPI_DISPLAY_TYPE_OTHER; 263 break; 264 } 265 266 return display_type; 267 } 268 269 void intel_acpi_device_id_update(struct intel_display *display) 270 { 271 struct intel_connector *connector; 272 struct drm_connector_list_iter conn_iter; 273 u8 display_index[16] = {}; 274 275 /* Populate the ACPI IDs for all connectors for a given drm_device */ 276 drm_connector_list_iter_begin(display->drm, &conn_iter); 277 for_each_intel_connector_iter(connector, &conn_iter) { 278 u32 device_id, type; 279 280 device_id = acpi_display_type(connector); 281 282 /* Use display type specific display index. */ 283 type = (device_id & ACPI_DISPLAY_TYPE_MASK) 284 >> ACPI_DISPLAY_TYPE_SHIFT; 285 device_id |= display_index[type]++ << ACPI_DISPLAY_INDEX_SHIFT; 286 287 connector->acpi_device_id = device_id; 288 } 289 drm_connector_list_iter_end(&conn_iter); 290 } 291 292 /* NOTE: The connector order must be final before this is called. */ 293 void intel_acpi_assign_connector_fwnodes(struct intel_display *display) 294 { 295 struct drm_device *drm_dev = display->drm; 296 struct drm_connector_list_iter conn_iter; 297 struct fwnode_handle *fwnode = NULL; 298 struct drm_connector *connector; 299 struct acpi_device *adev; 300 301 drm_connector_list_iter_begin(drm_dev, &conn_iter); 302 drm_for_each_connector_iter(connector, &conn_iter) { 303 /* Always getting the next, even when the last was not used. */ 304 fwnode = device_get_next_child_node(drm_dev->dev, fwnode); 305 if (!fwnode) 306 break; 307 308 switch (connector->connector_type) { 309 case DRM_MODE_CONNECTOR_LVDS: 310 case DRM_MODE_CONNECTOR_eDP: 311 case DRM_MODE_CONNECTOR_DSI: 312 /* 313 * Integrated displays have a specific address 0x1f on 314 * most Intel platforms, but not on all of them. 315 */ 316 adev = acpi_find_child_device(ACPI_COMPANION(drm_dev->dev), 317 0x1f, 0); 318 if (adev) { 319 connector->fwnode = 320 fwnode_handle_get(acpi_fwnode_handle(adev)); 321 break; 322 } 323 fallthrough; 324 default: 325 connector->fwnode = fwnode_handle_get(fwnode); 326 break; 327 } 328 } 329 drm_connector_list_iter_end(&conn_iter); 330 /* 331 * device_get_next_child_node() takes a reference on the fwnode, if 332 * we stopped iterating because we are out of connectors we need to 333 * put this, otherwise fwnode is NULL and the put is a no-op. 334 */ 335 fwnode_handle_put(fwnode); 336 } 337 338 void intel_acpi_video_register(struct intel_display *display) 339 { 340 struct drm_connector_list_iter conn_iter; 341 struct drm_connector *connector; 342 343 acpi_video_register(); 344 345 /* 346 * If i915 is driving an internal panel without registering its native 347 * backlight handler try to register the acpi_video backlight. 348 * For panels not driven by i915 another GPU driver may still register 349 * a native backlight later and acpi_video_register_backlight() should 350 * only be called after any native backlights have been registered. 351 */ 352 drm_connector_list_iter_begin(display->drm, &conn_iter); 353 drm_for_each_connector_iter(connector, &conn_iter) { 354 struct intel_panel *panel = &to_intel_connector(connector)->panel; 355 356 if (panel->backlight.funcs && !panel->backlight.device) { 357 acpi_video_register_backlight(); 358 break; 359 } 360 } 361 drm_connector_list_iter_end(&conn_iter); 362 } 363