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
  11 #include "i915_drv.h"
  12 #include "intel_acpi.h"
  13 #include "intel_display_types.h"
  14
  15 #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
  16 #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */
  17
  18 static const guid_t intel_dsm_guid =
  19         GUID_INIT(0x7ed873d3, 0xc2d0, 0x4e4f,
  20                   0xa8, 0x54, 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c);
  21
  22 #define INTEL_DSM_FN_GET_BIOS_DATA_FUNCS_SUPPORTED 0 /* No args */
  23
  24 static const guid_t intel_dsm_guid2 =
  25         GUID_INIT(0x3e5b41c6, 0xeb1d, 0x4260,
  26                   0x9d, 0x15, 0xc7, 0x1f, 0xba, 0xda, 0xe4, 0x14);
  27
  28 static char *intel_dsm_port_name(u8 id)
  29 {
  30         switch (id) {
  31         case 0:
  32                 return "Reserved";
  33         case 1:
  34                 return "Analog VGA";
  35         case 2:
  36                 return "LVDS";
  37         case 3:
  38                 return "Reserved";
  39         case 4:
  40                 return "HDMI/DVI_B";
  41         case 5:
  42                 return "HDMI/DVI_C";
  43         case 6:
  44                 return "HDMI/DVI_D";
  45         case 7:
  46                 return "DisplayPort_A";
  47         case 8:
  48                 return "DisplayPort_B";
  49         case 9:
  50                 return "DisplayPort_C";
  51         case 0xa:
  52                 return "DisplayPort_D";
  53         case 0xb:
  54         case 0xc:
  55         case 0xd:
  56                 return "Reserved";
  57         case 0xe:
  58                 return "WiDi";
  59         default:
  60                 return "bad type";
  61         }
  62 }
  63
  64 static char *intel_dsm_mux_type(u8 type)
  65 {
  66         switch (type) {
  67         case 0:
  68                 return "unknown";
  69         case 1:
  70                 return "No MUX, iGPU only";
  71         case 2:
  72                 return "No MUX, dGPU only";
  73         case 3:
  74                 return "MUXed between iGPU and dGPU";
  75         default:
  76                 return "bad type";
  77         }
  78 }
  79
  80 static void intel_dsm_platform_mux_info(acpi_handle dhandle)
  81 {
  82         int i;
  83         union acpi_object *pkg, *connector_count;
  84
  85         pkg = acpi_evaluate_dsm_typed(dhandle, &intel_dsm_guid,
  86                         INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO,
  87                         NULL, ACPI_TYPE_PACKAGE);
  88         if (!pkg) {
  89                 DRM_DEBUG_DRIVER("failed to evaluate _DSM\n");
  90                 return;
  91         }
  92
  93         if (!pkg->package.count) {
  94                 DRM_DEBUG_DRIVER("no connection in _DSM\n");
  95                 return;
  96         }
  97
  98         connector_count = &pkg->package.elements[0];
  99         DRM_DEBUG_DRIVER("MUX info connectors: %lld\n",
 100                   (unsigned long long)connector_count->integer.value);
 101         for (i = 1; i < pkg->package.count; i++) {
 102                 union acpi_object *obj = &pkg->package.elements[i];
 103                 union acpi_object *connector_id;
 104                 union acpi_object *info;
 105
 106                 if (obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) {
 107                         DRM_DEBUG_DRIVER("Invalid object for MUX #%d\n", i);
 108                         continue;
 109                 }
 110
 111                 connector_id = &obj->package.elements[0];
 112                 info = &obj->package.elements[1];
 113                 if (info->type != ACPI_TYPE_BUFFER || info->buffer.length < 4) {
 114                         DRM_DEBUG_DRIVER("Invalid info for MUX obj #%d\n", i);
 115                         continue;
 116                 }
 117
 118                 DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n",
 119                           (unsigned long long)connector_id->integer.value);
 120                 DRM_DEBUG_DRIVER("  port id: %s\n",
 121                        intel_dsm_port_name(info->buffer.pointer[0]));
 122                 DRM_DEBUG_DRIVER("  display mux info: %s\n",
 123                        intel_dsm_mux_type(info->buffer.pointer[1]));
 124                 DRM_DEBUG_DRIVER("  aux/dc mux info: %s\n",
 125                        intel_dsm_mux_type(info->buffer.pointer[2]));
 126                 DRM_DEBUG_DRIVER("  hpd mux info: %s\n",
 127                        intel_dsm_mux_type(info->buffer.pointer[3]));
 128         }
 129
 130         ACPI_FREE(pkg);
 131 }
 132
 133 static acpi_handle intel_dsm_pci_probe(struct pci_dev *pdev)
 134 {
 135         acpi_handle dhandle;
 136
 137         dhandle = ACPI_HANDLE(&pdev->dev);
 138         if (!dhandle)
 139                 return NULL;
 140
 141         if (!acpi_check_dsm(dhandle, &intel_dsm_guid, INTEL_DSM_REVISION_ID,
 142                             1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) {
 143                 DRM_DEBUG_KMS("no _DSM method for intel device\n");
 144                 return NULL;
 145         }
 146
 147         intel_dsm_platform_mux_info(dhandle);
 148
 149         return dhandle;
 150 }
 151
 152 static bool intel_dsm_detect(void)
 153 {
 154         acpi_handle dhandle = NULL;
 155         char acpi_method_name[255] = { 0 };
 156         struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
 157         struct pci_dev *pdev = NULL;
 158         int vga_count = 0;
 159
 160         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
 161                 vga_count++;
 162                 dhandle = intel_dsm_pci_probe(pdev) ?: dhandle;
 163         }
 164
 165         if (vga_count == 2 && dhandle) {
 166                 acpi_get_name(dhandle, ACPI_FULL_PATHNAME, &buffer);
 167                 DRM_DEBUG_DRIVER("vga_switcheroo: detected DSM switching method %s handle\n",
 168                                  acpi_method_name);
 169                 return true;
 170         }
 171
 172         return false;
 173 }
 174
 175 void intel_register_dsm_handler(void)
 176 {
 177         if (!intel_dsm_detect())
 178                 return;
 179 }
 180
 181 void intel_unregister_dsm_handler(void)
 182 {
 183 }
 184
 185 void intel_dsm_get_bios_data_funcs_supported(struct drm_i915_private *i915)
 186 {
 187         struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
 188         acpi_handle dhandle;
 189         union acpi_object *obj;
 190
 191         dhandle = ACPI_HANDLE(&pdev->dev);
 192         if (!dhandle)
 193                 return;
 194
 195         obj = acpi_evaluate_dsm(dhandle, &intel_dsm_guid2, INTEL_DSM_REVISION_ID,
 196                                 INTEL_DSM_FN_GET_BIOS_DATA_FUNCS_SUPPORTED, NULL);
 197         if (obj)
 198                 ACPI_FREE(obj);
 199 }
 200
 201 /*
 202  * ACPI Specification, Revision 5.0, Appendix B.3.2 _DOD (Enumerate All Devices
 203  * Attached to the Display Adapter).
 204  */
 205 #define ACPI_DISPLAY_INDEX_SHIFT                0
 206 #define ACPI_DISPLAY_INDEX_MASK                 (0xf << 0)
 207 #define ACPI_DISPLAY_PORT_ATTACHMENT_SHIFT      4
 208 #define ACPI_DISPLAY_PORT_ATTACHMENT_MASK       (0xf << 4)
 209 #define ACPI_DISPLAY_TYPE_SHIFT                 8
 210 #define ACPI_DISPLAY_TYPE_MASK                  (0xf << 8)
 211 #define ACPI_DISPLAY_TYPE_OTHER                 (0 << 8)
 212 #define ACPI_DISPLAY_TYPE_VGA                   (1 << 8)
 213 #define ACPI_DISPLAY_TYPE_TV                    (2 << 8)
 214 #define ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL      (3 << 8)
 215 #define ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL      (4 << 8)
 216 #define ACPI_VENDOR_SPECIFIC_SHIFT              12
 217 #define ACPI_VENDOR_SPECIFIC_MASK               (0xf << 12)
 218 #define ACPI_BIOS_CAN_DETECT                    (1 << 16)
 219 #define ACPI_DEPENDS_ON_VGA                     (1 << 17)
 220 #define ACPI_PIPE_ID_SHIFT                      18
 221 #define ACPI_PIPE_ID_MASK                       (7 << 18)
 222 #define ACPI_DEVICE_ID_SCHEME                   (1ULL << 31)
 223
 224 static u32 acpi_display_type(struct intel_connector *connector)
 225 {
 226         u32 display_type;
 227
 228         switch (connector->base.connector_type) {
 229         case DRM_MODE_CONNECTOR_VGA:
 230         case DRM_MODE_CONNECTOR_DVIA:
 231                 display_type = ACPI_DISPLAY_TYPE_VGA;
 232                 break;
 233         case DRM_MODE_CONNECTOR_Composite:
 234         case DRM_MODE_CONNECTOR_SVIDEO:
 235         case DRM_MODE_CONNECTOR_Component:
 236         case DRM_MODE_CONNECTOR_9PinDIN:
 237         case DRM_MODE_CONNECTOR_TV:
 238                 display_type = ACPI_DISPLAY_TYPE_TV;
 239                 break;
 240         case DRM_MODE_CONNECTOR_DVII:
 241         case DRM_MODE_CONNECTOR_DVID:
 242         case DRM_MODE_CONNECTOR_DisplayPort:
 243         case DRM_MODE_CONNECTOR_HDMIA:
 244         case DRM_MODE_CONNECTOR_HDMIB:
 245                 display_type = ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL;
 246                 break;
 247         case DRM_MODE_CONNECTOR_LVDS:
 248         case DRM_MODE_CONNECTOR_eDP:
 249         case DRM_MODE_CONNECTOR_DSI:
 250                 display_type = ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL;
 251                 break;
 252         case DRM_MODE_CONNECTOR_Unknown:
 253         case DRM_MODE_CONNECTOR_VIRTUAL:
 254                 display_type = ACPI_DISPLAY_TYPE_OTHER;
 255                 break;
 256         default:
 257                 MISSING_CASE(connector->base.connector_type);
 258                 display_type = ACPI_DISPLAY_TYPE_OTHER;
 259                 break;
 260         }
 261
 262         return display_type;
 263 }
 264
 265 void intel_acpi_device_id_update(struct drm_i915_private *dev_priv)
 266 {
 267         struct drm_device *drm_dev = &dev_priv->drm;
 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(drm_dev, &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 }