Commit | Line | Data |
---|---|---|
723bfd70 JB |
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> | |
760285e7 | 8 | #include <drm/drmP.h> |
c43b5634 | 9 | #include "i915_drv.h" |
723bfd70 JB |
10 | |
11 | #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */ | |
723bfd70 JB |
12 | #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */ |
13 | ||
14 | static struct intel_dsm_priv { | |
15 | acpi_handle dhandle; | |
16 | } intel_dsm_priv; | |
17 | ||
18 | static const u8 intel_dsm_guid[] = { | |
19 | 0xd3, 0x73, 0xd8, 0x7e, | |
20 | 0xd0, 0xc2, | |
21 | 0x4f, 0x4e, | |
22 | 0xa8, 0x54, | |
23 | 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c | |
24 | }; | |
25 | ||
723bfd70 JB |
26 | static char *intel_dsm_port_name(u8 id) |
27 | { | |
28 | switch (id) { | |
29 | case 0: | |
30 | return "Reserved"; | |
31 | case 1: | |
32 | return "Analog VGA"; | |
33 | case 2: | |
34 | return "LVDS"; | |
35 | case 3: | |
36 | return "Reserved"; | |
37 | case 4: | |
38 | return "HDMI/DVI_B"; | |
39 | case 5: | |
40 | return "HDMI/DVI_C"; | |
41 | case 6: | |
42 | return "HDMI/DVI_D"; | |
43 | case 7: | |
44 | return "DisplayPort_A"; | |
45 | case 8: | |
46 | return "DisplayPort_B"; | |
47 | case 9: | |
48 | return "DisplayPort_C"; | |
49 | case 0xa: | |
50 | return "DisplayPort_D"; | |
51 | case 0xb: | |
52 | case 0xc: | |
53 | case 0xd: | |
54 | return "Reserved"; | |
55 | case 0xe: | |
56 | return "WiDi"; | |
57 | default: | |
58 | return "bad type"; | |
59 | } | |
60 | } | |
61 | ||
62 | static char *intel_dsm_mux_type(u8 type) | |
63 | { | |
64 | switch (type) { | |
65 | case 0: | |
66 | return "unknown"; | |
67 | case 1: | |
68 | return "No MUX, iGPU only"; | |
69 | case 2: | |
70 | return "No MUX, dGPU only"; | |
71 | case 3: | |
72 | return "MUXed between iGPU and dGPU"; | |
73 | default: | |
74 | return "bad type"; | |
75 | } | |
76 | } | |
77 | ||
78 | static void intel_dsm_platform_mux_info(void) | |
79 | { | |
d5c3d79e JL |
80 | int i; |
81 | union acpi_object *pkg, *connector_count; | |
82 | ||
83 | pkg = acpi_evaluate_dsm_typed(intel_dsm_priv.dhandle, intel_dsm_guid, | |
84 | INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO, | |
85 | NULL, ACPI_TYPE_PACKAGE); | |
86 | if (!pkg) { | |
87 | DRM_DEBUG_DRIVER("failed to evaluate _DSM\n"); | |
88 | return; | |
723bfd70 JB |
89 | } |
90 | ||
d5c3d79e JL |
91 | connector_count = &pkg->package.elements[0]; |
92 | DRM_DEBUG_DRIVER("MUX info connectors: %lld\n", | |
93 | (unsigned long long)connector_count->integer.value); | |
94 | for (i = 1; i < pkg->package.count; i++) { | |
95 | union acpi_object *obj = &pkg->package.elements[i]; | |
96 | union acpi_object *connector_id = &obj->package.elements[0]; | |
97 | union acpi_object *info = &obj->package.elements[1]; | |
98 | DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n", | |
99 | (unsigned long long)connector_id->integer.value); | |
100 | DRM_DEBUG_DRIVER(" port id: %s\n", | |
101 | intel_dsm_port_name(info->buffer.pointer[0])); | |
102 | DRM_DEBUG_DRIVER(" display mux info: %s\n", | |
103 | intel_dsm_mux_type(info->buffer.pointer[1])); | |
104 | DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n", | |
105 | intel_dsm_mux_type(info->buffer.pointer[2])); | |
106 | DRM_DEBUG_DRIVER(" hpd mux info: %s\n", | |
107 | intel_dsm_mux_type(info->buffer.pointer[3])); | |
723bfd70 JB |
108 | } |
109 | ||
d5c3d79e | 110 | ACPI_FREE(pkg); |
723bfd70 JB |
111 | } |
112 | ||
723bfd70 JB |
113 | static bool intel_dsm_pci_probe(struct pci_dev *pdev) |
114 | { | |
2a3ca142 | 115 | acpi_handle dhandle; |
723bfd70 | 116 | |
3a83f992 | 117 | dhandle = ACPI_HANDLE(&pdev->dev); |
723bfd70 JB |
118 | if (!dhandle) |
119 | return false; | |
120 | ||
d5c3d79e JL |
121 | if (!acpi_check_dsm(dhandle, intel_dsm_guid, INTEL_DSM_REVISION_ID, |
122 | 1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) { | |
723bfd70 JB |
123 | DRM_DEBUG_KMS("no _DSM method for intel device\n"); |
124 | return false; | |
125 | } | |
126 | ||
723bfd70 | 127 | intel_dsm_priv.dhandle = dhandle; |
723bfd70 | 128 | intel_dsm_platform_mux_info(); |
d5c3d79e | 129 | |
723bfd70 JB |
130 | return true; |
131 | } | |
132 | ||
133 | static bool intel_dsm_detect(void) | |
134 | { | |
135 | char acpi_method_name[255] = { 0 }; | |
136 | struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; | |
137 | struct pci_dev *pdev = NULL; | |
138 | bool has_dsm = false; | |
139 | int vga_count = 0; | |
140 | ||
141 | while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { | |
142 | vga_count++; | |
143 | has_dsm |= intel_dsm_pci_probe(pdev); | |
144 | } | |
145 | ||
146 | if (vga_count == 2 && has_dsm) { | |
147 | acpi_get_name(intel_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer); | |
5389e916 | 148 | DRM_DEBUG_DRIVER("vga_switcheroo: detected DSM switching method %s handle\n", |
723bfd70 JB |
149 | acpi_method_name); |
150 | return true; | |
151 | } | |
152 | ||
153 | return false; | |
154 | } | |
155 | ||
156 | void intel_register_dsm_handler(void) | |
157 | { | |
158 | if (!intel_dsm_detect()) | |
159 | return; | |
723bfd70 JB |
160 | } |
161 | ||
162 | void intel_unregister_dsm_handler(void) | |
163 | { | |
723bfd70 | 164 | } |