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