| 1 | /* |
| 2 | * Intel ACPI functions |
| 3 | * |
| 4 | * _DSM related code stolen from nouveau_acpi.c. |
| 5 | */ |
| 6 | #include <linux/pci.h> |
| 7 | #include <linux/acpi.h> |
| 8 | #include <linux/vga_switcheroo.h> |
| 9 | #include <drm/drmP.h> |
| 10 | #include "i915_drv.h" |
| 11 | |
| 12 | #ifdef CONFIG_ACPI |
| 13 | |
| 14 | #ifdef __NetBSD__ |
| 15 | #include <dev/acpi/acpireg.h> |
| 16 | #define _COMPONENT ACPI_BUTTON_COMPONENT |
| 17 | ACPI_MODULE_NAME("acpi_intel_brightness" ) |
| 18 | |
| 19 | static ACPI_OBJECT * |
| 20 | acpi_evaluate_dsm(ACPI_HANDLE handle, const uint8_t *uuid, int rev, int func, |
| 21 | ACPI_OBJECT *argv4) |
| 22 | { |
| 23 | ACPI_OBJECT_LIST arg; |
| 24 | ACPI_OBJECT params[4]; |
| 25 | ACPI_BUFFER buf; |
| 26 | ACPI_STATUS rv; |
| 27 | |
| 28 | if (handle == NULL) |
| 29 | handle = ACPI_ROOT_OBJECT; |
| 30 | |
| 31 | arg.Count = 4; |
| 32 | arg.Pointer = params; |
| 33 | params[0].Type = ACPI_TYPE_BUFFER; |
| 34 | params[0].Buffer.Length = 16; |
| 35 | params[0].Buffer.Pointer = (char *)__UNCONST(uuid); |
| 36 | params[1].Type = ACPI_TYPE_INTEGER; |
| 37 | params[1].Integer.Value = rev; |
| 38 | params[2].Type = ACPI_TYPE_INTEGER; |
| 39 | params[2].Integer.Value = func; |
| 40 | if (argv4 != NULL) { |
| 41 | params[3] = *argv4; |
| 42 | } else { |
| 43 | params[3].Type = ACPI_TYPE_PACKAGE; |
| 44 | params[3].Package.Count = 0; |
| 45 | params[3].Package.Elements = NULL; |
| 46 | } |
| 47 | |
| 48 | buf.Pointer = NULL; |
| 49 | buf.Length = ACPI_ALLOCATE_LOCAL_BUFFER; |
| 50 | |
| 51 | rv = AcpiEvaluateObject(handle, "_DSM" , &arg, &buf); |
| 52 | if (ACPI_SUCCESS(rv)) |
| 53 | return (ACPI_OBJECT *)buf.Pointer; |
| 54 | return NULL; |
| 55 | } |
| 56 | |
| 57 | static inline ACPI_OBJECT * |
| 58 | acpi_evaluate_dsm_typed(ACPI_HANDLE handle, const uint8_t *uuid, int rev, |
| 59 | int func, ACPI_OBJECT *argv4, ACPI_OBJECT_TYPE type) |
| 60 | { |
| 61 | ACPI_OBJECT *obj; |
| 62 | |
| 63 | obj = acpi_evaluate_dsm(handle, uuid, rev, func, argv4); |
| 64 | if (obj != NULL && obj->Type != type) { |
| 65 | ACPI_FREE(obj); |
| 66 | obj = NULL; |
| 67 | } |
| 68 | return obj; |
| 69 | } |
| 70 | |
| 71 | #define ACPI_INIT_DSM_ARGV4(cnt, eles) \ |
| 72 | { \ |
| 73 | .Package.Type = ACPI_TYPE_PACKAGE, \ |
| 74 | .Package.Count = (cnt), \ |
| 75 | .Package.Elements = (eles) \ |
| 76 | } |
| 77 | |
| 78 | static bool |
| 79 | acpi_check_dsm(ACPI_HANDLE handle, const uint8_t *uuid, int rev, uint64_t funcs) |
| 80 | { |
| 81 | ACPI_OBJECT *obj; |
| 82 | uint64_t mask = 0; |
| 83 | int i; |
| 84 | |
| 85 | if (funcs == 0) |
| 86 | return false; |
| 87 | |
| 88 | obj = acpi_evaluate_dsm(handle, uuid, rev, 0, NULL); |
| 89 | if (obj == NULL) |
| 90 | return false; |
| 91 | |
| 92 | if (obj->Type == ACPI_TYPE_INTEGER) |
| 93 | mask = obj->Integer.Value; |
| 94 | else if (obj->Type == ACPI_TYPE_BUFFER) |
| 95 | for (i = 0; i < obj->Buffer.Length && i < 8; i++) |
| 96 | mask |= (uint64_t)obj->Buffer.Pointer[i] << (i * 8); |
| 97 | ACPI_FREE(obj); |
| 98 | |
| 99 | if ((mask & 0x1) == 0x1 && (mask & funcs) == funcs) |
| 100 | return true; |
| 101 | return false; |
| 102 | } |
| 103 | #endif |
| 104 | |
| 105 | #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */ |
| 106 | #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */ |
| 107 | |
| 108 | static struct intel_dsm_priv { |
| 109 | #ifdef __NetBSD__ |
| 110 | ACPI_HANDLE dhandle; |
| 111 | #else |
| 112 | acpi_handle dhandle; |
| 113 | #endif |
| 114 | } intel_dsm_priv; |
| 115 | |
| 116 | static const u8 intel_dsm_guid[] = { |
| 117 | 0xd3, 0x73, 0xd8, 0x7e, |
| 118 | 0xd0, 0xc2, |
| 119 | 0x4f, 0x4e, |
| 120 | 0xa8, 0x54, |
| 121 | 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c |
| 122 | }; |
| 123 | |
| 124 | static const char *intel_dsm_port_name(u8 id) |
| 125 | { |
| 126 | switch (id) { |
| 127 | case 0: |
| 128 | return "Reserved" ; |
| 129 | case 1: |
| 130 | return "Analog VGA" ; |
| 131 | case 2: |
| 132 | return "LVDS" ; |
| 133 | case 3: |
| 134 | return "Reserved" ; |
| 135 | case 4: |
| 136 | return "HDMI/DVI_B" ; |
| 137 | case 5: |
| 138 | return "HDMI/DVI_C" ; |
| 139 | case 6: |
| 140 | return "HDMI/DVI_D" ; |
| 141 | case 7: |
| 142 | return "DisplayPort_A" ; |
| 143 | case 8: |
| 144 | return "DisplayPort_B" ; |
| 145 | case 9: |
| 146 | return "DisplayPort_C" ; |
| 147 | case 0xa: |
| 148 | return "DisplayPort_D" ; |
| 149 | case 0xb: |
| 150 | case 0xc: |
| 151 | case 0xd: |
| 152 | return "Reserved" ; |
| 153 | case 0xe: |
| 154 | return "WiDi" ; |
| 155 | default: |
| 156 | return "bad type" ; |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | static const char *intel_dsm_mux_type(u8 type) |
| 161 | { |
| 162 | switch (type) { |
| 163 | case 0: |
| 164 | return "unknown" ; |
| 165 | case 1: |
| 166 | return "No MUX, iGPU only" ; |
| 167 | case 2: |
| 168 | return "No MUX, dGPU only" ; |
| 169 | case 3: |
| 170 | return "MUXed between iGPU and dGPU" ; |
| 171 | default: |
| 172 | return "bad type" ; |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | static void intel_dsm_platform_mux_info(void) |
| 177 | { |
| 178 | int i; |
| 179 | #ifdef __NetBSD__ |
| 180 | ACPI_OBJECT *pkg, *connector_count; |
| 181 | #else |
| 182 | union acpi_object *pkg, *connector_count; |
| 183 | #endif |
| 184 | |
| 185 | pkg = acpi_evaluate_dsm_typed(intel_dsm_priv.dhandle, intel_dsm_guid, |
| 186 | INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO, |
| 187 | NULL, ACPI_TYPE_PACKAGE); |
| 188 | if (!pkg) { |
| 189 | DRM_DEBUG_DRIVER("failed to evaluate _DSM\n" ); |
| 190 | return; |
| 191 | } |
| 192 | |
| 193 | #ifdef __NetBSD__ |
| 194 | connector_count = &pkg->Package.Elements[0]; |
| 195 | DRM_DEBUG_DRIVER("MUX info connectors: %lld\n" , |
| 196 | (unsigned long long)connector_count->Integer.Value); |
| 197 | for (i = 1; i < pkg->Package.Count; i++) { |
| 198 | ACPI_OBJECT *obj = &pkg->Package.Elements[i]; |
| 199 | ACPI_OBJECT *connector_id = &obj->Package.Elements[0]; |
| 200 | ACPI_OBJECT *info = &obj->Package.Elements[1]; |
| 201 | DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n" , |
| 202 | (unsigned long long)connector_id->Integer.Value); |
| 203 | DRM_DEBUG_DRIVER(" port id: %s\n" , |
| 204 | intel_dsm_port_name(info->Buffer.Pointer[0])); |
| 205 | DRM_DEBUG_DRIVER(" display mux info: %s\n" , |
| 206 | intel_dsm_mux_type(info->Buffer.Pointer[1])); |
| 207 | DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n" , |
| 208 | intel_dsm_mux_type(info->Buffer.Pointer[2])); |
| 209 | DRM_DEBUG_DRIVER(" hpd mux info: %s\n" , |
| 210 | intel_dsm_mux_type(info->Buffer.Pointer[3])); |
| 211 | } |
| 212 | #else |
| 213 | connector_count = &pkg->package.elements[0]; |
| 214 | DRM_DEBUG_DRIVER("MUX info connectors: %lld\n" , |
| 215 | (unsigned long long)connector_count->integer.value); |
| 216 | for (i = 1; i < pkg->package.count; i++) { |
| 217 | union acpi_object *obj = &pkg->package.elements[i]; |
| 218 | union acpi_object *connector_id = &obj->package.elements[0]; |
| 219 | union acpi_object *info = &obj->package.elements[1]; |
| 220 | DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n" , |
| 221 | (unsigned long long)connector_id->integer.value); |
| 222 | DRM_DEBUG_DRIVER(" port id: %s\n" , |
| 223 | intel_dsm_port_name(info->buffer.pointer[0])); |
| 224 | DRM_DEBUG_DRIVER(" display mux info: %s\n" , |
| 225 | intel_dsm_mux_type(info->buffer.pointer[1])); |
| 226 | DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n" , |
| 227 | intel_dsm_mux_type(info->buffer.pointer[2])); |
| 228 | DRM_DEBUG_DRIVER(" hpd mux info: %s\n" , |
| 229 | intel_dsm_mux_type(info->buffer.pointer[3])); |
| 230 | } |
| 231 | #endif |
| 232 | ACPI_FREE(pkg); |
| 233 | } |
| 234 | |
| 235 | #ifdef __NetBSD__ |
| 236 | static bool intel_dsm_pci_probe(ACPI_HANDLE dhandle) |
| 237 | #else |
| 238 | static bool intel_dsm_pci_probe(struct pci_dev *pdev) |
| 239 | #endif |
| 240 | { |
| 241 | #ifndef __NetBSD__ |
| 242 | acpi_handle dhandle; |
| 243 | |
| 244 | dhandle = ACPI_HANDLE(&pdev->dev); |
| 245 | #endif |
| 246 | if (!dhandle) |
| 247 | return false; |
| 248 | |
| 249 | if (!acpi_check_dsm(dhandle, intel_dsm_guid, INTEL_DSM_REVISION_ID, |
| 250 | 1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) { |
| 251 | DRM_DEBUG_KMS("no _DSM method for intel device\n" ); |
| 252 | return false; |
| 253 | } |
| 254 | |
| 255 | intel_dsm_priv.dhandle = dhandle; |
| 256 | intel_dsm_platform_mux_info(); |
| 257 | |
| 258 | return true; |
| 259 | } |
| 260 | |
| 261 | #ifdef __NetBSD__ |
| 262 | |
| 263 | static int vga_count; |
| 264 | static bool has_dsm; |
| 265 | |
| 266 | /* XXX from sys/dev/pci/vga_pcivar.h */ |
| 267 | #define DEVICE_IS_VGA_PCI(class, id) \ |
| 268 | (((PCI_CLASS(class) == PCI_CLASS_DISPLAY && \ |
| 269 | PCI_SUBCLASS(class) == PCI_SUBCLASS_DISPLAY_VGA) || \ |
| 270 | (PCI_CLASS(class) == PCI_CLASS_PREHISTORIC && \ |
| 271 | PCI_SUBCLASS(class) == PCI_SUBCLASS_PREHISTORIC_VGA)) ? 1 : 0) |
| 272 | |
| 273 | static int |
| 274 | intel_dsm_vga_match(const struct pci_attach_args *pa) |
| 275 | { |
| 276 | |
| 277 | if (!DEVICE_IS_VGA_PCI(pa->pa_class, pa->pa_id)) |
| 278 | return 0; |
| 279 | |
| 280 | vga_count++; |
| 281 | struct acpi_devnode *node = acpi_pcidev_find(0 /*XXX segment*/, |
| 282 | pa->pa_bus, pa->pa_device, pa->pa_function); |
| 283 | if (node != NULL) |
| 284 | has_dsm |= intel_dsm_pci_probe(node->ad_handle); |
| 285 | return 0; |
| 286 | } |
| 287 | |
| 288 | static bool intel_dsm_detect(struct drm_device *dev) |
| 289 | { |
| 290 | char acpi_method_name[255] = { 0 }; |
| 291 | |
| 292 | vga_count = 0; |
| 293 | has_dsm = false; |
| 294 | pci_find_device(&dev->pdev->pd_pa, intel_dsm_vga_match); |
| 295 | |
| 296 | if (vga_count == 2 && has_dsm) { |
| 297 | const char *name = acpi_name(intel_dsm_priv.dhandle); |
| 298 | strlcpy(acpi_method_name, name, sizeof(acpi_method_name)); |
| 299 | DRM_DEBUG_DRIVER("VGA switcheroo: detected DSM switching method %s handle\n" , |
| 300 | acpi_method_name); |
| 301 | return true; |
| 302 | } |
| 303 | |
| 304 | return false; |
| 305 | } |
| 306 | #else |
| 307 | static bool intel_dsm_detect(void) |
| 308 | { |
| 309 | char acpi_method_name[255] = { 0 }; |
| 310 | struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; |
| 311 | struct pci_dev *pdev = NULL; |
| 312 | bool has_dsm = false; |
| 313 | int vga_count = 0; |
| 314 | |
| 315 | while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { |
| 316 | vga_count++; |
| 317 | has_dsm |= intel_dsm_pci_probe(pdev); |
| 318 | } |
| 319 | |
| 320 | if (vga_count == 2 && has_dsm) { |
| 321 | acpi_get_name(intel_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer); |
| 322 | DRM_DEBUG_DRIVER("VGA switcheroo: detected DSM switching method %s handle\n" , |
| 323 | acpi_method_name); |
| 324 | return true; |
| 325 | } |
| 326 | |
| 327 | return false; |
| 328 | } |
| 329 | #endif |
| 330 | |
| 331 | #ifdef __NetBSD__ |
| 332 | void intel_register_dsm_handler(struct drm_device *dev) |
| 333 | { |
| 334 | if (!intel_dsm_detect(dev)) |
| 335 | return; |
| 336 | } |
| 337 | #else |
| 338 | void intel_register_dsm_handler(void) |
| 339 | { |
| 340 | if (!intel_dsm_detect()) |
| 341 | return; |
| 342 | } |
| 343 | #endif |
| 344 | |
| 345 | void intel_unregister_dsm_handler(void) |
| 346 | { |
| 347 | } |
| 348 | |
| 349 | #endif /* CONFIG_ACPI */ |
| 350 | |