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 } 266