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 connector_count = &pkg->package.elements[0]; 88 DRM_DEBUG_DRIVER("MUX info connectors: %lld\n", 89 (unsigned long long)connector_count->integer.value); 90 for (i = 1; i < pkg->package.count; i++) { 91 union acpi_object *obj = &pkg->package.elements[i]; 92 union acpi_object *connector_id = &obj->package.elements[0]; 93 union acpi_object *info = &obj->package.elements[1]; 94 DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n", 95 (unsigned long long)connector_id->integer.value); 96 DRM_DEBUG_DRIVER(" port id: %s\n", 97 intel_dsm_port_name(info->buffer.pointer[0])); 98 DRM_DEBUG_DRIVER(" display mux info: %s\n", 99 intel_dsm_mux_type(info->buffer.pointer[1])); 100 DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n", 101 intel_dsm_mux_type(info->buffer.pointer[2])); 102 DRM_DEBUG_DRIVER(" hpd mux info: %s\n", 103 intel_dsm_mux_type(info->buffer.pointer[3])); 104 } 105 106 ACPI_FREE(pkg); 107 } 108 109 static acpi_handle intel_dsm_pci_probe(struct pci_dev *pdev) 110 { 111 acpi_handle dhandle; 112 113 dhandle = ACPI_HANDLE(&pdev->dev); 114 if (!dhandle) 115 return NULL; 116 117 if (!acpi_check_dsm(dhandle, &intel_dsm_guid, INTEL_DSM_REVISION_ID, 118 1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) { 119 DRM_DEBUG_KMS("no _DSM method for intel device\n"); 120 return NULL; 121 } 122 123 intel_dsm_platform_mux_info(dhandle); 124 125 return dhandle; 126 } 127 128 static bool intel_dsm_detect(void) 129 { 130 acpi_handle dhandle = NULL; 131 char acpi_method_name[255] = { 0 }; 132 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; 133 struct pci_dev *pdev = NULL; 134 int vga_count = 0; 135 136 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { 137 vga_count++; 138 dhandle = intel_dsm_pci_probe(pdev) ?: dhandle; 139 } 140 141 if (vga_count == 2 && dhandle) { 142 acpi_get_name(dhandle, ACPI_FULL_PATHNAME, &buffer); 143 DRM_DEBUG_DRIVER("vga_switcheroo: detected DSM switching method %s handle\n", 144 acpi_method_name); 145 return true; 146 } 147 148 return false; 149 } 150 151 void intel_register_dsm_handler(void) 152 { 153 if (!intel_dsm_detect()) 154 return; 155 } 156 157 void intel_unregister_dsm_handler(void) 158 { 159 } 160 161 /* 162 * ACPI Specification, Revision 5.0, Appendix B.3.2 _DOD (Enumerate All Devices 163 * Attached to the Display Adapter). 164 */ 165 #define ACPI_DISPLAY_INDEX_SHIFT 0 166 #define ACPI_DISPLAY_INDEX_MASK (0xf << 0) 167 #define ACPI_DISPLAY_PORT_ATTACHMENT_SHIFT 4 168 #define ACPI_DISPLAY_PORT_ATTACHMENT_MASK (0xf << 4) 169 #define ACPI_DISPLAY_TYPE_SHIFT 8 170 #define ACPI_DISPLAY_TYPE_MASK (0xf << 8) 171 #define ACPI_DISPLAY_TYPE_OTHER (0 << 8) 172 #define ACPI_DISPLAY_TYPE_VGA (1 << 8) 173 #define ACPI_DISPLAY_TYPE_TV (2 << 8) 174 #define ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL (3 << 8) 175 #define ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL (4 << 8) 176 #define ACPI_VENDOR_SPECIFIC_SHIFT 12 177 #define ACPI_VENDOR_SPECIFIC_MASK (0xf << 12) 178 #define ACPI_BIOS_CAN_DETECT (1 << 16) 179 #define ACPI_DEPENDS_ON_VGA (1 << 17) 180 #define ACPI_PIPE_ID_SHIFT 18 181 #define ACPI_PIPE_ID_MASK (7 << 18) 182 #define ACPI_DEVICE_ID_SCHEME (1ULL << 31) 183 184 static u32 acpi_display_type(struct intel_connector *connector) 185 { 186 u32 display_type; 187 188 switch (connector->base.connector_type) { 189 case DRM_MODE_CONNECTOR_VGA: 190 case DRM_MODE_CONNECTOR_DVIA: 191 display_type = ACPI_DISPLAY_TYPE_VGA; 192 break; 193 case DRM_MODE_CONNECTOR_Composite: 194 case DRM_MODE_CONNECTOR_SVIDEO: 195 case DRM_MODE_CONNECTOR_Component: 196 case DRM_MODE_CONNECTOR_9PinDIN: 197 case DRM_MODE_CONNECTOR_TV: 198 display_type = ACPI_DISPLAY_TYPE_TV; 199 break; 200 case DRM_MODE_CONNECTOR_DVII: 201 case DRM_MODE_CONNECTOR_DVID: 202 case DRM_MODE_CONNECTOR_DisplayPort: 203 case DRM_MODE_CONNECTOR_HDMIA: 204 case DRM_MODE_CONNECTOR_HDMIB: 205 display_type = ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL; 206 break; 207 case DRM_MODE_CONNECTOR_LVDS: 208 case DRM_MODE_CONNECTOR_eDP: 209 case DRM_MODE_CONNECTOR_DSI: 210 display_type = ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL; 211 break; 212 case DRM_MODE_CONNECTOR_Unknown: 213 case DRM_MODE_CONNECTOR_VIRTUAL: 214 display_type = ACPI_DISPLAY_TYPE_OTHER; 215 break; 216 default: 217 MISSING_CASE(connector->base.connector_type); 218 display_type = ACPI_DISPLAY_TYPE_OTHER; 219 break; 220 } 221 222 return display_type; 223 } 224 225 void intel_acpi_device_id_update(struct drm_i915_private *dev_priv) 226 { 227 struct drm_device *drm_dev = &dev_priv->drm; 228 struct intel_connector *connector; 229 struct drm_connector_list_iter conn_iter; 230 u8 display_index[16] = {}; 231 232 /* Populate the ACPI IDs for all connectors for a given drm_device */ 233 drm_connector_list_iter_begin(drm_dev, &conn_iter); 234 for_each_intel_connector_iter(connector, &conn_iter) { 235 u32 device_id, type; 236 237 device_id = acpi_display_type(connector); 238 239 /* Use display type specific display index. */ 240 type = (device_id & ACPI_DISPLAY_TYPE_MASK) 241 >> ACPI_DISPLAY_TYPE_SHIFT; 242 device_id |= display_index[type]++ << ACPI_DISPLAY_INDEX_SHIFT; 243 244 connector->acpi_device_id = device_id; 245 } 246 drm_connector_list_iter_end(&conn_iter); 247 } 248