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1// SPDX-License-Identifier: GPL-2.02/*3 * Intel ACPI functions4 *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 19static 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 25static const guid_t intel_dsm_guid2 =26 GUID_INIT(0x3e5b41c6, 0xeb1d, 0x4260,27 0x9d, 0x15, 0xc7, 0x1f, 0xba, 0xda, 0xe4, 0x14);28 29static 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 65static 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 81static 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 134static 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 153static 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 176void intel_register_dsm_handler(void)177{178 if (!intel_dsm_detect())179 return;180}181 182void intel_unregister_dsm_handler(void)183{184}185 186void intel_dsm_get_bios_data_funcs_supported(struct intel_display *display)187{188 struct pci_dev *pdev = to_pci_dev(display->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 Devices204 * Attached to the Display Adapter).205 */206#define ACPI_DISPLAY_INDEX_SHIFT 0207#define ACPI_DISPLAY_INDEX_MASK (0xf << 0)208#define ACPI_DISPLAY_PORT_ATTACHMENT_SHIFT 4209#define ACPI_DISPLAY_PORT_ATTACHMENT_MASK (0xf << 4)210#define ACPI_DISPLAY_TYPE_SHIFT 8211#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 12218#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 18222#define ACPI_PIPE_ID_MASK (7 << 18)223#define ACPI_DEVICE_ID_SCHEME (1ULL << 31)224 225static 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 266void intel_acpi_device_id_update(struct intel_display *display)267{268 struct intel_connector *connector;269 struct drm_connector_list_iter conn_iter;270 u8 display_index[16] = {};271 272 /* Populate the ACPI IDs for all connectors for a given drm_device */273 drm_connector_list_iter_begin(display->drm, &conn_iter);274 for_each_intel_connector_iter(connector, &conn_iter) {275 u32 device_id, type;276 277 device_id = acpi_display_type(connector);278 279 /* Use display type specific display index. */280 type = (device_id & ACPI_DISPLAY_TYPE_MASK)281 >> ACPI_DISPLAY_TYPE_SHIFT;282 device_id |= display_index[type]++ << ACPI_DISPLAY_INDEX_SHIFT;283 284 connector->acpi_device_id = device_id;285 }286 drm_connector_list_iter_end(&conn_iter);287}288 289/* NOTE: The connector order must be final before this is called. */290void intel_acpi_assign_connector_fwnodes(struct intel_display *display)291{292 struct drm_device *drm_dev = display->drm;293 struct drm_connector_list_iter conn_iter;294 struct fwnode_handle *fwnode = NULL;295 struct drm_connector *connector;296 struct acpi_device *adev;297 298 drm_connector_list_iter_begin(drm_dev, &conn_iter);299 drm_for_each_connector_iter(connector, &conn_iter) {300 /* Always getting the next, even when the last was not used. */301 fwnode = device_get_next_child_node(drm_dev->dev, fwnode);302 if (!fwnode)303 break;304 305 switch (connector->connector_type) {306 case DRM_MODE_CONNECTOR_LVDS:307 case DRM_MODE_CONNECTOR_eDP:308 case DRM_MODE_CONNECTOR_DSI:309 /*310 * Integrated displays have a specific address 0x1f on311 * most Intel platforms, but not on all of them.312 */313 adev = acpi_find_child_device(ACPI_COMPANION(drm_dev->dev),314 0x1f, 0);315 if (adev) {316 connector->fwnode =317 fwnode_handle_get(acpi_fwnode_handle(adev));318 break;319 }320 fallthrough;321 default:322 connector->fwnode = fwnode_handle_get(fwnode);323 break;324 }325 }326 drm_connector_list_iter_end(&conn_iter);327 /*328 * device_get_next_child_node() takes a reference on the fwnode, if329 * we stopped iterating because we are out of connectors we need to330 * put this, otherwise fwnode is NULL and the put is a no-op.331 */332 fwnode_handle_put(fwnode);333}334 335void intel_acpi_video_register(struct intel_display *display)336{337 struct drm_connector_list_iter conn_iter;338 struct drm_connector *connector;339 340 acpi_video_register();341 342 /*343 * If i915 is driving an internal panel without registering its native344 * backlight handler try to register the acpi_video backlight.345 * For panels not driven by i915 another GPU driver may still register346 * a native backlight later and acpi_video_register_backlight() should347 * only be called after any native backlights have been registered.348 */349 drm_connector_list_iter_begin(display->drm, &conn_iter);350 drm_for_each_connector_iter(connector, &conn_iter) {351 struct intel_panel *panel = &to_intel_connector(connector)->panel;352 353 if (panel->backlight.funcs && !panel->backlight.device) {354 acpi_video_register_backlight();355 break;356 }357 }358 drm_connector_list_iter_end(&conn_iter);359}360