i915/display/intel_acpi.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Intel ACPI functions
0004  *
0005  * _DSM related code stolen from nouveau_acpi.c.
0006  */
0007
0008 #include <linux/pci.h>
0009 #include <linux/acpi.h>
0010
0011 #include "i915_drv.h"
0012 #include "intel_acpi.h"
0013 #include "intel_display_types.h"
0014
0015 #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
0016 #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */
0017
0018 static const guid_t intel_dsm_guid =
0019     GUID_INIT(0x7ed873d3, 0xc2d0, 0x4e4f,
0020           0xa8, 0x54, 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c);
0021
0022 #define INTEL_DSM_FN_GET_BIOS_DATA_FUNCS_SUPPORTED 0 /* No args */
0023
0024 static const guid_t intel_dsm_guid2 =
0025     GUID_INIT(0x3e5b41c6, 0xeb1d, 0x4260,
0026           0x9d, 0x15, 0xc7, 0x1f, 0xba, 0xda, 0xe4, 0x14);
0027
0028 static char *intel_dsm_port_name(u8 id)
0029 {
0030     switch (id) {
0031     case 0:
0032         return "Reserved";
0033     case 1:
0034         return "Analog VGA";
0035     case 2:
0036         return "LVDS";
0037     case 3:
0038         return "Reserved";
0039     case 4:
0040         return "HDMI/DVI_B";
0041     case 5:
0042         return "HDMI/DVI_C";
0043     case 6:
0044         return "HDMI/DVI_D";
0045     case 7:
0046         return "DisplayPort_A";
0047     case 8:
0048         return "DisplayPort_B";
0049     case 9:
0050         return "DisplayPort_C";
0051     case 0xa:
0052         return "DisplayPort_D";
0053     case 0xb:
0054     case 0xc:
0055     case 0xd:
0056         return "Reserved";
0057     case 0xe:
0058         return "WiDi";
0059     default:
0060         return "bad type";
0061     }
0062 }
0063
0064 static char *intel_dsm_mux_type(u8 type)
0065 {
0066     switch (type) {
0067     case 0:
0068         return "unknown";
0069     case 1:
0070         return "No MUX, iGPU only";
0071     case 2:
0072         return "No MUX, dGPU only";
0073     case 3:
0074         return "MUXed between iGPU and dGPU";
0075     default:
0076         return "bad type";
0077     }
0078 }
0079
0080 static void intel_dsm_platform_mux_info(acpi_handle dhandle)
0081 {
0082     int i;
0083     union acpi_object *pkg, *connector_count;
0084
0085     pkg = acpi_evaluate_dsm_typed(dhandle, &intel_dsm_guid,
0086             INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO,
0087             NULL, ACPI_TYPE_PACKAGE);
0088     if (!pkg) {
0089         DRM_DEBUG_DRIVER("failed to evaluate _DSM\n");
0090         return;
0091     }
0092
0093     if (!pkg->package.count) {
0094         DRM_DEBUG_DRIVER("no connection in _DSM\n");
0095         return;
0096     }
0097
0098     connector_count = &pkg->package.elements[0];
0099     DRM_DEBUG_DRIVER("MUX info connectors: %lld\n",
0100           (unsigned long long)connector_count->integer.value);
0101     for (i = 1; i < pkg->package.count; i++) {
0102         union acpi_object *obj = &pkg->package.elements[i];
0103         union acpi_object *connector_id;
0104         union acpi_object *info;
0105
0106         if (obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) {
0107             DRM_DEBUG_DRIVER("Invalid object for MUX #%d\n", i);
0108             continue;
0109         }
0110
0111         connector_id = &obj->package.elements[0];
0112         info = &obj->package.elements[1];
0113         if (info->type != ACPI_TYPE_BUFFER || info->buffer.length < 4) {
0114             DRM_DEBUG_DRIVER("Invalid info for MUX obj #%d\n", i);
0115             continue;
0116         }
0117
0118         DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n",
0119               (unsigned long long)connector_id->integer.value);
0120         DRM_DEBUG_DRIVER("  port id: %s\n",
0121                intel_dsm_port_name(info->buffer.pointer[0]));
0122         DRM_DEBUG_DRIVER("  display mux info: %s\n",
0123                intel_dsm_mux_type(info->buffer.pointer[1]));
0124         DRM_DEBUG_DRIVER("  aux/dc mux info: %s\n",
0125                intel_dsm_mux_type(info->buffer.pointer[2]));
0126         DRM_DEBUG_DRIVER("  hpd mux info: %s\n",
0127                intel_dsm_mux_type(info->buffer.pointer[3]));
0128     }
0129
0130     ACPI_FREE(pkg);
0131 }
0132
0133 static acpi_handle intel_dsm_pci_probe(struct pci_dev *pdev)
0134 {
0135     acpi_handle dhandle;
0136
0137     dhandle = ACPI_HANDLE(&pdev->dev);
0138     if (!dhandle)
0139         return NULL;
0140
0141     if (!acpi_check_dsm(dhandle, &intel_dsm_guid, INTEL_DSM_REVISION_ID,
0142                 1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) {
0143         DRM_DEBUG_KMS("no _DSM method for intel device\n");
0144         return NULL;
0145     }
0146
0147     intel_dsm_platform_mux_info(dhandle);
0148
0149     return dhandle;
0150 }
0151
0152 static bool intel_dsm_detect(void)
0153 {
0154     acpi_handle dhandle = NULL;
0155     char acpi_method_name[255] = { 0 };
0156     struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
0157     struct pci_dev *pdev = NULL;
0158     int vga_count = 0;
0159
0160     while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
0161         vga_count++;
0162         dhandle = intel_dsm_pci_probe(pdev) ?: dhandle;
0163     }
0164
0165     if (vga_count == 2 && dhandle) {
0166         acpi_get_name(dhandle, ACPI_FULL_PATHNAME, &buffer);
0167         DRM_DEBUG_DRIVER("vga_switcheroo: detected DSM switching method %s handle\n",
0168                  acpi_method_name);
0169         return true;
0170     }
0171
0172     return false;
0173 }
0174
0175 void intel_register_dsm_handler(void)
0176 {
0177     if (!intel_dsm_detect())
0178         return;
0179 }
0180
0181 void intel_unregister_dsm_handler(void)
0182 {
0183 }
0184
0185 void intel_dsm_get_bios_data_funcs_supported(struct drm_i915_private *i915)
0186 {
0187     struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
0188     acpi_handle dhandle;
0189     union acpi_object *obj;
0190
0191     dhandle = ACPI_HANDLE(&pdev->dev);
0192     if (!dhandle)
0193         return;
0194
0195     obj = acpi_evaluate_dsm(dhandle, &intel_dsm_guid2, INTEL_DSM_REVISION_ID,
0196                 INTEL_DSM_FN_GET_BIOS_DATA_FUNCS_SUPPORTED, NULL);
0197     if (obj)
0198         ACPI_FREE(obj);
0199 }
0200
0201 /*
0202  * ACPI Specification, Revision 5.0, Appendix B.3.2 _DOD (Enumerate All Devices
0203  * Attached to the Display Adapter).
0204  */
0205 #define ACPI_DISPLAY_INDEX_SHIFT        0
0206 #define ACPI_DISPLAY_INDEX_MASK         (0xf << 0)
0207 #define ACPI_DISPLAY_PORT_ATTACHMENT_SHIFT  4
0208 #define ACPI_DISPLAY_PORT_ATTACHMENT_MASK   (0xf << 4)
0209 #define ACPI_DISPLAY_TYPE_SHIFT         8
0210 #define ACPI_DISPLAY_TYPE_MASK          (0xf << 8)
0211 #define ACPI_DISPLAY_TYPE_OTHER         (0 << 8)
0212 #define ACPI_DISPLAY_TYPE_VGA           (1 << 8)
0213 #define ACPI_DISPLAY_TYPE_TV            (2 << 8)
0214 #define ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL  (3 << 8)
0215 #define ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL  (4 << 8)
0216 #define ACPI_VENDOR_SPECIFIC_SHIFT      12
0217 #define ACPI_VENDOR_SPECIFIC_MASK       (0xf << 12)
0218 #define ACPI_BIOS_CAN_DETECT            (1 << 16)
0219 #define ACPI_DEPENDS_ON_VGA         (1 << 17)
0220 #define ACPI_PIPE_ID_SHIFT          18
0221 #define ACPI_PIPE_ID_MASK           (7 << 18)
0222 #define ACPI_DEVICE_ID_SCHEME           (1ULL << 31)
0223
0224 static u32 acpi_display_type(struct intel_connector *connector)
0225 {
0226     u32 display_type;
0227
0228     switch (connector->base.connector_type) {
0229     case DRM_MODE_CONNECTOR_VGA:
0230     case DRM_MODE_CONNECTOR_DVIA:
0231         display_type = ACPI_DISPLAY_TYPE_VGA;
0232         break;
0233     case DRM_MODE_CONNECTOR_Composite:
0234     case DRM_MODE_CONNECTOR_SVIDEO:
0235     case DRM_MODE_CONNECTOR_Component:
0236     case DRM_MODE_CONNECTOR_9PinDIN:
0237     case DRM_MODE_CONNECTOR_TV:
0238         display_type = ACPI_DISPLAY_TYPE_TV;
0239         break;
0240     case DRM_MODE_CONNECTOR_DVII:
0241     case DRM_MODE_CONNECTOR_DVID:
0242     case DRM_MODE_CONNECTOR_DisplayPort:
0243     case DRM_MODE_CONNECTOR_HDMIA:
0244     case DRM_MODE_CONNECTOR_HDMIB:
0245         display_type = ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL;
0246         break;
0247     case DRM_MODE_CONNECTOR_LVDS:
0248     case DRM_MODE_CONNECTOR_eDP:
0249     case DRM_MODE_CONNECTOR_DSI:
0250         display_type = ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL;
0251         break;
0252     case DRM_MODE_CONNECTOR_Unknown:
0253     case DRM_MODE_CONNECTOR_VIRTUAL:
0254         display_type = ACPI_DISPLAY_TYPE_OTHER;
0255         break;
0256     default:
0257         MISSING_CASE(connector->base.connector_type);
0258         display_type = ACPI_DISPLAY_TYPE_OTHER;
0259         break;
0260     }
0261
0262     return display_type;
0263 }
0264
0265 void intel_acpi_device_id_update(struct drm_i915_private *dev_priv)
0266 {
0267     struct drm_device *drm_dev = &dev_priv->drm;
0268     struct intel_connector *connector;
0269     struct drm_connector_list_iter conn_iter;
0270     u8 display_index[16] = {};
0271
0272     /* Populate the ACPI IDs for all connectors for a given drm_device */
0273     drm_connector_list_iter_begin(drm_dev, &conn_iter);
0274     for_each_intel_connector_iter(connector, &conn_iter) {
0275         u32 device_id, type;
0276
0277         device_id = acpi_display_type(connector);
0278
0279         /* Use display type specific display index. */
0280         type = (device_id & ACPI_DISPLAY_TYPE_MASK)
0281             >> ACPI_DISPLAY_TYPE_SHIFT;
0282         device_id |= display_index[type]++ << ACPI_DISPLAY_INDEX_SHIFT;
0283
0284         connector->acpi_device_id = device_id;
0285     }
0286     drm_connector_list_iter_end(&conn_iter);
0287 }
0288
0289 /* NOTE: The connector order must be final before this is called. */
0290 void intel_acpi_assign_connector_fwnodes(struct drm_i915_private *i915)
0291 {
0292     struct drm_connector_list_iter conn_iter;
0293     struct drm_device *drm_dev = &i915->drm;
0294     struct fwnode_handle *fwnode = NULL;
0295     struct drm_connector *connector;
0296     struct acpi_device *adev;
0297
0298     drm_connector_list_iter_begin(drm_dev, &conn_iter);
0299     drm_for_each_connector_iter(connector, &conn_iter) {
0300         /* Always getting the next, even when the last was not used. */
0301         fwnode = device_get_next_child_node(drm_dev->dev, fwnode);
0302         if (!fwnode)
0303             break;
0304
0305         switch (connector->connector_type) {
0306         case DRM_MODE_CONNECTOR_LVDS:
0307         case DRM_MODE_CONNECTOR_eDP:
0308         case DRM_MODE_CONNECTOR_DSI:
0309             /*
0310              * Integrated displays have a specific address 0x1f on
0311              * most Intel platforms, but not on all of them.
0312              */
0313             adev = acpi_find_child_device(ACPI_COMPANION(drm_dev->dev),
0314                               0x1f, 0);
0315             if (adev) {
0316                 connector->fwnode =
0317                     fwnode_handle_get(acpi_fwnode_handle(adev));
0318                 break;
0319             }
0320             fallthrough;
0321         default:
0322             connector->fwnode = fwnode_handle_get(fwnode);
0323             break;
0324         }
0325     }
0326     drm_connector_list_iter_end(&conn_iter);
0327     /*
0328      * device_get_next_child_node() takes a reference on the fwnode, if
0329      * we stopped iterating because we are out of connectors we need to
0330      * put this, otherwise fwnode is NULL and the put is a no-op.
0331      */
0332     fwnode_handle_put(fwnode);
0333 }