drivers/gpu/drm/i915/display/intel_acpi.c

   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_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
  19 static 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
  25 static const guid_t intel_dsm_guid2 =
  26         GUID_INIT(0x3e5b41c6, 0xeb1d, 0x4260,
  27                   0x9d, 0x15, 0xc7, 0x1f, 0xba, 0xda, 0xe4, 0x14);
  28
  29 static 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
  65 static 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
  81 static 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
 134 static 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
 153 static bool intel_dsm_detect(void)
 154 {
 155         acpi_handle dhandle = NULL;
 156         char acpi_method_name[255] = { 0 };
 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
 176 void intel_register_dsm_handler(void)
 177 {
 178         if (!intel_dsm_detect())
 179                 return;
 180 }
 181
 182 void intel_unregister_dsm_handler(void)
 183 {
 184 }
 185
 186 void intel_dsm_get_bios_data_funcs_supported(struct drm_i915_private *i915)
 187 {
 188         struct pci_dev *pdev = to_pci_dev(i915->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 Devices
 204  * Attached to the Display Adapter).
 205  */
 206 #define ACPI_DISPLAY_INDEX_SHIFT                0
 207 #define ACPI_DISPLAY_INDEX_MASK                 (0xf << 0)
 208 #define ACPI_DISPLAY_PORT_ATTACHMENT_SHIFT      4
 209 #define ACPI_DISPLAY_PORT_ATTACHMENT_MASK       (0xf << 4)
 210 #define ACPI_DISPLAY_TYPE_SHIFT                 8
 211 #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              12
 218 #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                      18
 222 #define ACPI_PIPE_ID_MASK                       (7 << 18)
 223 #define ACPI_DEVICE_ID_SCHEME                   (1ULL << 31)
 224
 225 static 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
 266 void intel_acpi_device_id_update(struct drm_i915_private *dev_priv)
 267 {
 268         struct drm_device *drm_dev = &dev_priv->drm;
 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(drm_dev, &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 drm_i915_private *i915)
 292 {
 293         struct drm_connector_list_iter conn_iter;
 294         struct drm_device *drm_dev = &i915->drm;
 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 drm_i915_private *i915)
 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(&i915->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 }