4 * _DSM related code stolen from nouveau_acpi.c.
10 #include <dev/drm2/drmP.h>
11 #include <dev/drm2/i915/i915_drv.h>
12 #include <contrib/dev/acpica/include/acpi.h>
13 #include <contrib/dev/acpica/include/accommon.h>
14 #include <dev/acpica/acpivar.h>
16 #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
18 #define INTEL_DSM_FN_SUPPORTED_FUNCTIONS 0 /* No args */
19 #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */
21 static struct intel_dsm_priv {
25 static const u8 intel_dsm_guid[] = {
26 0xd3, 0x73, 0xd8, 0x7e,
30 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c
33 static int intel_dsm(ACPI_HANDLE handle, int func, int arg)
35 ACPI_BUFFER output = { ACPI_ALLOCATE_BUFFER, NULL };
36 ACPI_OBJECT_LIST input;
37 ACPI_OBJECT params[4];
43 input.Pointer = params;
44 params[0].Type = ACPI_TYPE_BUFFER;
45 params[0].Buffer.Length = sizeof(intel_dsm_guid);
46 params[0].Buffer.Pointer = __DECONST(char *, intel_dsm_guid);
47 params[1].Type = ACPI_TYPE_INTEGER;
48 params[1].Integer.Value = INTEL_DSM_REVISION_ID;
49 params[2].Type = ACPI_TYPE_INTEGER;
50 params[2].Integer.Value = func;
51 params[3].Type = ACPI_TYPE_INTEGER;
52 params[3].Integer.Value = arg;
54 ret = AcpiEvaluateObject(handle, "_DSM", &input, &output);
56 DRM_DEBUG_DRIVER("failed to evaluate _DSM: %d\n", ret);
60 obj = (ACPI_OBJECT *)output.Pointer;
64 case ACPI_TYPE_INTEGER:
65 result = obj->Integer.Value;
68 case ACPI_TYPE_BUFFER:
69 if (obj->Buffer.Length == 4) {
70 result = (obj->Buffer.Pointer[0] |
71 (obj->Buffer.Pointer[1] << 8) |
72 (obj->Buffer.Pointer[2] << 16) |
73 (obj->Buffer.Pointer[3] << 24));
80 if (result == 0x80000002)
83 AcpiOsFree(output.Pointer);
87 static char *intel_dsm_port_name(u8 id)
105 return "DisplayPort_A";
107 return "DisplayPort_B";
109 return "DisplayPort_C";
111 return "DisplayPort_D";
123 static char *intel_dsm_mux_type(u8 type)
129 return "No MUX, iGPU only";
131 return "No MUX, dGPU only";
133 return "MUXed between iGPU and dGPU";
139 static void intel_dsm_platform_mux_info(void)
141 ACPI_BUFFER output = { ACPI_ALLOCATE_BUFFER, NULL };
142 ACPI_OBJECT_LIST input;
143 ACPI_OBJECT params[4];
148 input.Pointer = params;
149 params[0].Type = ACPI_TYPE_BUFFER;
150 params[0].Buffer.Length = sizeof(intel_dsm_guid);
151 params[0].Buffer.Pointer = __DECONST(char *, intel_dsm_guid);
152 params[1].Type = ACPI_TYPE_INTEGER;
153 params[1].Integer.Value = INTEL_DSM_REVISION_ID;
154 params[2].Type = ACPI_TYPE_INTEGER;
155 params[2].Integer.Value = INTEL_DSM_FN_PLATFORM_MUX_INFO;
156 params[3].Type = ACPI_TYPE_INTEGER;
157 params[3].Integer.Value = 0;
159 ret = AcpiEvaluateObject(intel_dsm_priv.dhandle, "_DSM", &input,
162 DRM_DEBUG_DRIVER("failed to evaluate _DSM: %d\n", ret);
166 pkg = (ACPI_OBJECT *)output.Pointer;
168 if (pkg->Type == ACPI_TYPE_PACKAGE) {
169 ACPI_OBJECT *connector_count = &pkg->Package.Elements[0];
170 DRM_DEBUG_DRIVER("MUX info connectors: %lld\n",
171 (unsigned long long)connector_count->Integer.Value);
172 for (i = 1; i < pkg->Package.Count; i++) {
173 ACPI_OBJECT *obj = &pkg->Package.Elements[i];
174 ACPI_OBJECT *connector_id =
175 &obj->Package.Elements[0];
176 ACPI_OBJECT *info = &obj->Package.Elements[1];
177 DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n",
178 (unsigned long long)connector_id->Integer.Value);
179 DRM_DEBUG_DRIVER(" port id: %s\n",
180 intel_dsm_port_name(info->Buffer.Pointer[0]));
181 DRM_DEBUG_DRIVER(" display mux info: %s\n",
182 intel_dsm_mux_type(info->Buffer.Pointer[1]));
183 DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n",
184 intel_dsm_mux_type(info->Buffer.Pointer[2]));
185 DRM_DEBUG_DRIVER(" hpd mux info: %s\n",
186 intel_dsm_mux_type(info->Buffer.Pointer[3]));
191 AcpiOsFree(output.Pointer);
194 static bool intel_dsm_pci_probe(device_t dev)
196 ACPI_HANDLE dhandle, intel_handle;
200 dhandle = acpi_get_handle(dev);
204 status = AcpiGetHandle(dhandle, "_DSM", &intel_handle);
205 if (ACPI_FAILURE(status)) {
206 DRM_DEBUG_KMS("no _DSM method for intel device\n");
210 ret = intel_dsm(dhandle, INTEL_DSM_FN_SUPPORTED_FUNCTIONS, 0);
212 DRM_DEBUG_KMS("failed to get supported _DSM functions\n");
216 intel_dsm_priv.dhandle = dhandle;
218 intel_dsm_platform_mux_info();
222 static bool intel_dsm_detect(void)
224 char acpi_method_name[255] = { 0 };
225 ACPI_BUFFER buffer = {sizeof(acpi_method_name), acpi_method_name};
227 bool has_dsm = false;
231 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
232 #endif /* FREEBSD_WIP */
233 if ((dev = pci_find_class(PCIC_DISPLAY, PCIS_DISPLAY_VGA)) != NULL) {
235 has_dsm |= intel_dsm_pci_probe(dev);
238 if (vga_count == 2 && has_dsm) {
239 AcpiGetName(intel_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer);
240 DRM_DEBUG_DRIVER("VGA switcheroo: detected DSM switching method %s handle\n",
248 void intel_register_dsm_handler(void)
250 if (!intel_dsm_detect())
254 void intel_unregister_dsm_handler(void)