Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
723bfd70 JB |
2 | /* |
3 | * Intel ACPI functions | |
4 | * | |
5 | * _DSM related code stolen from nouveau_acpi.c. | |
6 | */ | |
7 | #include <linux/pci.h> | |
8 | #include <linux/acpi.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 | ||
94116f81 AS |
15 | static const guid_t intel_dsm_guid = |
16 | GUID_INIT(0x7ed873d3, 0xc2d0, 0x4e4f, | |
17 | 0xa8, 0x54, 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c); | |
723bfd70 | 18 | |
723bfd70 JB |
19 | static char *intel_dsm_port_name(u8 id) |
20 | { | |
21 | switch (id) { | |
22 | case 0: | |
23 | return "Reserved"; | |
24 | case 1: | |
25 | return "Analog VGA"; | |
26 | case 2: | |
27 | return "LVDS"; | |
28 | case 3: | |
29 | return "Reserved"; | |
30 | case 4: | |
31 | return "HDMI/DVI_B"; | |
32 | case 5: | |
33 | return "HDMI/DVI_C"; | |
34 | case 6: | |
35 | return "HDMI/DVI_D"; | |
36 | case 7: | |
37 | return "DisplayPort_A"; | |
38 | case 8: | |
39 | return "DisplayPort_B"; | |
40 | case 9: | |
41 | return "DisplayPort_C"; | |
42 | case 0xa: | |
43 | return "DisplayPort_D"; | |
44 | case 0xb: | |
45 | case 0xc: | |
46 | case 0xd: | |
47 | return "Reserved"; | |
48 | case 0xe: | |
49 | return "WiDi"; | |
50 | default: | |
51 | return "bad type"; | |
52 | } | |
53 | } | |
54 | ||
55 | static char *intel_dsm_mux_type(u8 type) | |
56 | { | |
57 | switch (type) { | |
58 | case 0: | |
59 | return "unknown"; | |
60 | case 1: | |
61 | return "No MUX, iGPU only"; | |
62 | case 2: | |
63 | return "No MUX, dGPU only"; | |
64 | case 3: | |
65 | return "MUXed between iGPU and dGPU"; | |
66 | default: | |
67 | return "bad type"; | |
68 | } | |
69 | } | |
70 | ||
856e1b17 | 71 | static void intel_dsm_platform_mux_info(acpi_handle dhandle) |
723bfd70 | 72 | { |
d5c3d79e JL |
73 | int i; |
74 | union acpi_object *pkg, *connector_count; | |
75 | ||
856e1b17 | 76 | pkg = acpi_evaluate_dsm_typed(dhandle, &intel_dsm_guid, |
d5c3d79e JL |
77 | INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO, |
78 | NULL, ACPI_TYPE_PACKAGE); | |
79 | if (!pkg) { | |
80 | DRM_DEBUG_DRIVER("failed to evaluate _DSM\n"); | |
81 | return; | |
723bfd70 JB |
82 | } |
83 | ||
d5c3d79e JL |
84 | connector_count = &pkg->package.elements[0]; |
85 | DRM_DEBUG_DRIVER("MUX info connectors: %lld\n", | |
86 | (unsigned long long)connector_count->integer.value); | |
87 | for (i = 1; i < pkg->package.count; i++) { | |
88 | union acpi_object *obj = &pkg->package.elements[i]; | |
89 | union acpi_object *connector_id = &obj->package.elements[0]; | |
90 | union acpi_object *info = &obj->package.elements[1]; | |
91 | DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n", | |
92 | (unsigned long long)connector_id->integer.value); | |
93 | DRM_DEBUG_DRIVER(" port id: %s\n", | |
94 | intel_dsm_port_name(info->buffer.pointer[0])); | |
95 | DRM_DEBUG_DRIVER(" display mux info: %s\n", | |
96 | intel_dsm_mux_type(info->buffer.pointer[1])); | |
97 | DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n", | |
98 | intel_dsm_mux_type(info->buffer.pointer[2])); | |
99 | DRM_DEBUG_DRIVER(" hpd mux info: %s\n", | |
100 | intel_dsm_mux_type(info->buffer.pointer[3])); | |
723bfd70 JB |
101 | } |
102 | ||
d5c3d79e | 103 | ACPI_FREE(pkg); |
723bfd70 JB |
104 | } |
105 | ||
856e1b17 | 106 | static acpi_handle intel_dsm_pci_probe(struct pci_dev *pdev) |
723bfd70 | 107 | { |
2a3ca142 | 108 | acpi_handle dhandle; |
723bfd70 | 109 | |
3a83f992 | 110 | dhandle = ACPI_HANDLE(&pdev->dev); |
723bfd70 | 111 | if (!dhandle) |
856e1b17 | 112 | return NULL; |
723bfd70 | 113 | |
94116f81 | 114 | if (!acpi_check_dsm(dhandle, &intel_dsm_guid, INTEL_DSM_REVISION_ID, |
d5c3d79e | 115 | 1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) { |
723bfd70 | 116 | DRM_DEBUG_KMS("no _DSM method for intel device\n"); |
856e1b17 | 117 | return NULL; |
723bfd70 JB |
118 | } |
119 | ||
856e1b17 | 120 | intel_dsm_platform_mux_info(dhandle); |
d5c3d79e | 121 | |
856e1b17 | 122 | return dhandle; |
723bfd70 JB |
123 | } |
124 | ||
125 | static bool intel_dsm_detect(void) | |
126 | { | |
856e1b17 | 127 | acpi_handle dhandle = NULL; |
723bfd70 JB |
128 | char acpi_method_name[255] = { 0 }; |
129 | struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; | |
130 | struct pci_dev *pdev = NULL; | |
723bfd70 JB |
131 | int vga_count = 0; |
132 | ||
133 | while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { | |
134 | vga_count++; | |
856e1b17 | 135 | dhandle = intel_dsm_pci_probe(pdev) ?: dhandle; |
723bfd70 JB |
136 | } |
137 | ||
856e1b17 JN |
138 | if (vga_count == 2 && dhandle) { |
139 | acpi_get_name(dhandle, ACPI_FULL_PATHNAME, &buffer); | |
5389e916 | 140 | DRM_DEBUG_DRIVER("vga_switcheroo: detected DSM switching method %s handle\n", |
723bfd70 JB |
141 | acpi_method_name); |
142 | return true; | |
143 | } | |
144 | ||
145 | return false; | |
146 | } | |
147 | ||
148 | void intel_register_dsm_handler(void) | |
149 | { | |
150 | if (!intel_dsm_detect()) | |
151 | return; | |
723bfd70 JB |
152 | } |
153 | ||
154 | void intel_unregister_dsm_handler(void) | |
155 | { | |
723bfd70 | 156 | } |