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> | |
8 | #include <linux/vga_switcheroo.h> | |
760285e7 | 9 | #include <drm/drmP.h> |
c43b5634 | 10 | #include "i915_drv.h" |
723bfd70 JB |
11 | |
12 | #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */ | |
723bfd70 JB |
13 | #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */ |
14 | ||
15 | static struct intel_dsm_priv { | |
16 | acpi_handle dhandle; | |
17 | } intel_dsm_priv; | |
18 | ||
19 | static const u8 intel_dsm_guid[] = { | |
20 | 0xd3, 0x73, 0xd8, 0x7e, | |
21 | 0xd0, 0xc2, | |
22 | 0x4f, 0x4e, | |
23 | 0xa8, 0x54, | |
24 | 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c | |
25 | }; | |
26 | ||
723bfd70 JB |
27 | static char *intel_dsm_port_name(u8 id) |
28 | { | |
29 | switch (id) { | |
30 | case 0: | |
31 | return "Reserved"; | |
32 | case 1: | |
33 | return "Analog VGA"; | |
34 | case 2: | |
35 | return "LVDS"; | |
36 | case 3: | |
37 | return "Reserved"; | |
38 | case 4: | |
39 | return "HDMI/DVI_B"; | |
40 | case 5: | |
41 | return "HDMI/DVI_C"; | |
42 | case 6: | |
43 | return "HDMI/DVI_D"; | |
44 | case 7: | |
45 | return "DisplayPort_A"; | |
46 | case 8: | |
47 | return "DisplayPort_B"; | |
48 | case 9: | |
49 | return "DisplayPort_C"; | |
50 | case 0xa: | |
51 | return "DisplayPort_D"; | |
52 | case 0xb: | |
53 | case 0xc: | |
54 | case 0xd: | |
55 | return "Reserved"; | |
56 | case 0xe: | |
57 | return "WiDi"; | |
58 | default: | |
59 | return "bad type"; | |
60 | } | |
61 | } | |
62 | ||
63 | static char *intel_dsm_mux_type(u8 type) | |
64 | { | |
65 | switch (type) { | |
66 | case 0: | |
67 | return "unknown"; | |
68 | case 1: | |
69 | return "No MUX, iGPU only"; | |
70 | case 2: | |
71 | return "No MUX, dGPU only"; | |
72 | case 3: | |
73 | return "MUXed between iGPU and dGPU"; | |
74 | default: | |
75 | return "bad type"; | |
76 | } | |
77 | } | |
78 | ||
79 | static void intel_dsm_platform_mux_info(void) | |
80 | { | |
d5c3d79e JL |
81 | int i; |
82 | union acpi_object *pkg, *connector_count; | |
83 | ||
84 | pkg = acpi_evaluate_dsm_typed(intel_dsm_priv.dhandle, intel_dsm_guid, | |
85 | INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO, | |
86 | NULL, ACPI_TYPE_PACKAGE); | |
87 | if (!pkg) { | |
88 | DRM_DEBUG_DRIVER("failed to evaluate _DSM\n"); | |
89 | return; | |
723bfd70 JB |
90 | } |
91 | ||
d5c3d79e JL |
92 | connector_count = &pkg->package.elements[0]; |
93 | DRM_DEBUG_DRIVER("MUX info connectors: %lld\n", | |
94 | (unsigned long long)connector_count->integer.value); | |
95 | for (i = 1; i < pkg->package.count; i++) { | |
96 | union acpi_object *obj = &pkg->package.elements[i]; | |
97 | union acpi_object *connector_id = &obj->package.elements[0]; | |
98 | union acpi_object *info = &obj->package.elements[1]; | |
99 | DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n", | |
100 | (unsigned long long)connector_id->integer.value); | |
101 | DRM_DEBUG_DRIVER(" port id: %s\n", | |
102 | intel_dsm_port_name(info->buffer.pointer[0])); | |
103 | DRM_DEBUG_DRIVER(" display mux info: %s\n", | |
104 | intel_dsm_mux_type(info->buffer.pointer[1])); | |
105 | DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n", | |
106 | intel_dsm_mux_type(info->buffer.pointer[2])); | |
107 | DRM_DEBUG_DRIVER(" hpd mux info: %s\n", | |
108 | intel_dsm_mux_type(info->buffer.pointer[3])); | |
723bfd70 JB |
109 | } |
110 | ||
d5c3d79e | 111 | ACPI_FREE(pkg); |
723bfd70 JB |
112 | } |
113 | ||
723bfd70 JB |
114 | static bool intel_dsm_pci_probe(struct pci_dev *pdev) |
115 | { | |
2a3ca142 | 116 | acpi_handle dhandle; |
723bfd70 | 117 | |
3a83f992 | 118 | dhandle = ACPI_HANDLE(&pdev->dev); |
723bfd70 JB |
119 | if (!dhandle) |
120 | return false; | |
121 | ||
d5c3d79e JL |
122 | if (!acpi_check_dsm(dhandle, intel_dsm_guid, INTEL_DSM_REVISION_ID, |
123 | 1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) { | |
723bfd70 JB |
124 | DRM_DEBUG_KMS("no _DSM method for intel device\n"); |
125 | return false; | |
126 | } | |
127 | ||
723bfd70 | 128 | intel_dsm_priv.dhandle = dhandle; |
723bfd70 | 129 | intel_dsm_platform_mux_info(); |
d5c3d79e | 130 | |
723bfd70 JB |
131 | return true; |
132 | } | |
133 | ||
134 | static bool intel_dsm_detect(void) | |
135 | { | |
136 | char acpi_method_name[255] = { 0 }; | |
137 | struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; | |
138 | struct pci_dev *pdev = NULL; | |
139 | bool has_dsm = false; | |
140 | int vga_count = 0; | |
141 | ||
142 | while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { | |
143 | vga_count++; | |
144 | has_dsm |= intel_dsm_pci_probe(pdev); | |
145 | } | |
146 | ||
147 | if (vga_count == 2 && has_dsm) { | |
148 | acpi_get_name(intel_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer); | |
149 | DRM_DEBUG_DRIVER("VGA switcheroo: detected DSM switching method %s handle\n", | |
150 | acpi_method_name); | |
151 | return true; | |
152 | } | |
153 | ||
154 | return false; | |
155 | } | |
156 | ||
157 | void intel_register_dsm_handler(void) | |
158 | { | |
159 | if (!intel_dsm_detect()) | |
160 | return; | |
723bfd70 JB |
161 | } |
162 | ||
163 | void intel_unregister_dsm_handler(void) | |
164 | { | |
723bfd70 | 165 | } |