This source file includes following definitions.
- intel_dsm_port_name
- intel_dsm_mux_type
- intel_dsm_platform_mux_info
- intel_dsm_pci_probe
- intel_dsm_detect
- intel_register_dsm_handler
- intel_unregister_dsm_handler
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8 #include <linux/pci.h>
9 #include <linux/acpi.h>
10
11 #include "i915_drv.h"
12 #include "intel_acpi.h"
13
14 #define INTEL_DSM_REVISION_ID 1
15 #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1
16
17 static const guid_t intel_dsm_guid =
18 GUID_INIT(0x7ed873d3, 0xc2d0, 0x4e4f,
19 0xa8, 0x54, 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c);
20
21 static char *intel_dsm_port_name(u8 id)
22 {
23 switch (id) {
24 case 0:
25 return "Reserved";
26 case 1:
27 return "Analog VGA";
28 case 2:
29 return "LVDS";
30 case 3:
31 return "Reserved";
32 case 4:
33 return "HDMI/DVI_B";
34 case 5:
35 return "HDMI/DVI_C";
36 case 6:
37 return "HDMI/DVI_D";
38 case 7:
39 return "DisplayPort_A";
40 case 8:
41 return "DisplayPort_B";
42 case 9:
43 return "DisplayPort_C";
44 case 0xa:
45 return "DisplayPort_D";
46 case 0xb:
47 case 0xc:
48 case 0xd:
49 return "Reserved";
50 case 0xe:
51 return "WiDi";
52 default:
53 return "bad type";
54 }
55 }
56
57 static char *intel_dsm_mux_type(u8 type)
58 {
59 switch (type) {
60 case 0:
61 return "unknown";
62 case 1:
63 return "No MUX, iGPU only";
64 case 2:
65 return "No MUX, dGPU only";
66 case 3:
67 return "MUXed between iGPU and dGPU";
68 default:
69 return "bad type";
70 }
71 }
72
73 static void intel_dsm_platform_mux_info(acpi_handle dhandle)
74 {
75 int i;
76 union acpi_object *pkg, *connector_count;
77
78 pkg = acpi_evaluate_dsm_typed(dhandle, &intel_dsm_guid,
79 INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO,
80 NULL, ACPI_TYPE_PACKAGE);
81 if (!pkg) {
82 DRM_DEBUG_DRIVER("failed to evaluate _DSM\n");
83 return;
84 }
85
86 connector_count = &pkg->package.elements[0];
87 DRM_DEBUG_DRIVER("MUX info connectors: %lld\n",
88 (unsigned long long)connector_count->integer.value);
89 for (i = 1; i < pkg->package.count; i++) {
90 union acpi_object *obj = &pkg->package.elements[i];
91 union acpi_object *connector_id = &obj->package.elements[0];
92 union acpi_object *info = &obj->package.elements[1];
93 DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n",
94 (unsigned long long)connector_id->integer.value);
95 DRM_DEBUG_DRIVER(" port id: %s\n",
96 intel_dsm_port_name(info->buffer.pointer[0]));
97 DRM_DEBUG_DRIVER(" display mux info: %s\n",
98 intel_dsm_mux_type(info->buffer.pointer[1]));
99 DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n",
100 intel_dsm_mux_type(info->buffer.pointer[2]));
101 DRM_DEBUG_DRIVER(" hpd mux info: %s\n",
102 intel_dsm_mux_type(info->buffer.pointer[3]));
103 }
104
105 ACPI_FREE(pkg);
106 }
107
108 static acpi_handle intel_dsm_pci_probe(struct pci_dev *pdev)
109 {
110 acpi_handle dhandle;
111
112 dhandle = ACPI_HANDLE(&pdev->dev);
113 if (!dhandle)
114 return NULL;
115
116 if (!acpi_check_dsm(dhandle, &intel_dsm_guid, INTEL_DSM_REVISION_ID,
117 1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) {
118 DRM_DEBUG_KMS("no _DSM method for intel device\n");
119 return NULL;
120 }
121
122 intel_dsm_platform_mux_info(dhandle);
123
124 return dhandle;
125 }
126
127 static bool intel_dsm_detect(void)
128 {
129 acpi_handle dhandle = NULL;
130 char acpi_method_name[255] = { 0 };
131 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
132 struct pci_dev *pdev = NULL;
133 int vga_count = 0;
134
135 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
136 vga_count++;
137 dhandle = intel_dsm_pci_probe(pdev) ?: dhandle;
138 }
139
140 if (vga_count == 2 && dhandle) {
141 acpi_get_name(dhandle, ACPI_FULL_PATHNAME, &buffer);
142 DRM_DEBUG_DRIVER("vga_switcheroo: detected DSM switching method %s handle\n",
143 acpi_method_name);
144 return true;
145 }
146
147 return false;
148 }
149
150 void intel_register_dsm_handler(void)
151 {
152 if (!intel_dsm_detect())
153 return;
154 }
155
156 void intel_unregister_dsm_handler(void)
157 {
158 }