Commit | Line | Data |
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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> | |
9 | #include <acpi/acpi_drivers.h> | |
10 | ||
760285e7 | 11 | #include <drm/drmP.h> |
c43b5634 | 12 | #include "i915_drv.h" |
723bfd70 JB |
13 | |
14 | #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */ | |
15 | ||
16 | #define INTEL_DSM_FN_SUPPORTED_FUNCTIONS 0 /* No args */ | |
17 | #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */ | |
18 | ||
19 | static struct intel_dsm_priv { | |
20 | acpi_handle dhandle; | |
21 | } intel_dsm_priv; | |
22 | ||
23 | static const u8 intel_dsm_guid[] = { | |
24 | 0xd3, 0x73, 0xd8, 0x7e, | |
25 | 0xd0, 0xc2, | |
26 | 0x4f, 0x4e, | |
27 | 0xa8, 0x54, | |
28 | 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c | |
29 | }; | |
30 | ||
31 | static int intel_dsm(acpi_handle handle, int func, int arg) | |
32 | { | |
33 | struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; | |
34 | struct acpi_object_list input; | |
35 | union acpi_object params[4]; | |
36 | union acpi_object *obj; | |
37 | u32 result; | |
38 | int ret = 0; | |
39 | ||
40 | input.count = 4; | |
41 | input.pointer = params; | |
42 | params[0].type = ACPI_TYPE_BUFFER; | |
43 | params[0].buffer.length = sizeof(intel_dsm_guid); | |
44 | params[0].buffer.pointer = (char *)intel_dsm_guid; | |
45 | params[1].type = ACPI_TYPE_INTEGER; | |
46 | params[1].integer.value = INTEL_DSM_REVISION_ID; | |
47 | params[2].type = ACPI_TYPE_INTEGER; | |
48 | params[2].integer.value = func; | |
49 | params[3].type = ACPI_TYPE_INTEGER; | |
50 | params[3].integer.value = arg; | |
51 | ||
52 | ret = acpi_evaluate_object(handle, "_DSM", &input, &output); | |
53 | if (ret) { | |
54 | DRM_DEBUG_DRIVER("failed to evaluate _DSM: %d\n", ret); | |
55 | return ret; | |
56 | } | |
57 | ||
58 | obj = (union acpi_object *)output.pointer; | |
59 | ||
60 | result = 0; | |
61 | switch (obj->type) { | |
62 | case ACPI_TYPE_INTEGER: | |
63 | result = obj->integer.value; | |
64 | break; | |
65 | ||
66 | case ACPI_TYPE_BUFFER: | |
67 | if (obj->buffer.length == 4) { | |
0206e353 | 68 | result = (obj->buffer.pointer[0] | |
723bfd70 JB |
69 | (obj->buffer.pointer[1] << 8) | |
70 | (obj->buffer.pointer[2] << 16) | | |
71 | (obj->buffer.pointer[3] << 24)); | |
72 | break; | |
73 | } | |
74 | default: | |
75 | ret = -EINVAL; | |
76 | break; | |
77 | } | |
78 | if (result == 0x80000002) | |
79 | ret = -ENODEV; | |
80 | ||
81 | kfree(output.pointer); | |
82 | return ret; | |
83 | } | |
84 | ||
85 | static char *intel_dsm_port_name(u8 id) | |
86 | { | |
87 | switch (id) { | |
88 | case 0: | |
89 | return "Reserved"; | |
90 | case 1: | |
91 | return "Analog VGA"; | |
92 | case 2: | |
93 | return "LVDS"; | |
94 | case 3: | |
95 | return "Reserved"; | |
96 | case 4: | |
97 | return "HDMI/DVI_B"; | |
98 | case 5: | |
99 | return "HDMI/DVI_C"; | |
100 | case 6: | |
101 | return "HDMI/DVI_D"; | |
102 | case 7: | |
103 | return "DisplayPort_A"; | |
104 | case 8: | |
105 | return "DisplayPort_B"; | |
106 | case 9: | |
107 | return "DisplayPort_C"; | |
108 | case 0xa: | |
109 | return "DisplayPort_D"; | |
110 | case 0xb: | |
111 | case 0xc: | |
112 | case 0xd: | |
113 | return "Reserved"; | |
114 | case 0xe: | |
115 | return "WiDi"; | |
116 | default: | |
117 | return "bad type"; | |
118 | } | |
119 | } | |
120 | ||
121 | static char *intel_dsm_mux_type(u8 type) | |
122 | { | |
123 | switch (type) { | |
124 | case 0: | |
125 | return "unknown"; | |
126 | case 1: | |
127 | return "No MUX, iGPU only"; | |
128 | case 2: | |
129 | return "No MUX, dGPU only"; | |
130 | case 3: | |
131 | return "MUXed between iGPU and dGPU"; | |
132 | default: | |
133 | return "bad type"; | |
134 | } | |
135 | } | |
136 | ||
137 | static void intel_dsm_platform_mux_info(void) | |
138 | { | |
139 | struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; | |
140 | struct acpi_object_list input; | |
141 | union acpi_object params[4]; | |
142 | union acpi_object *pkg; | |
143 | int i, ret; | |
144 | ||
145 | input.count = 4; | |
146 | input.pointer = params; | |
147 | params[0].type = ACPI_TYPE_BUFFER; | |
148 | params[0].buffer.length = sizeof(intel_dsm_guid); | |
149 | params[0].buffer.pointer = (char *)intel_dsm_guid; | |
150 | params[1].type = ACPI_TYPE_INTEGER; | |
151 | params[1].integer.value = INTEL_DSM_REVISION_ID; | |
152 | params[2].type = ACPI_TYPE_INTEGER; | |
153 | params[2].integer.value = INTEL_DSM_FN_PLATFORM_MUX_INFO; | |
154 | params[3].type = ACPI_TYPE_INTEGER; | |
155 | params[3].integer.value = 0; | |
156 | ||
157 | ret = acpi_evaluate_object(intel_dsm_priv.dhandle, "_DSM", &input, | |
158 | &output); | |
159 | if (ret) { | |
160 | DRM_DEBUG_DRIVER("failed to evaluate _DSM: %d\n", ret); | |
161 | goto out; | |
162 | } | |
163 | ||
164 | pkg = (union acpi_object *)output.pointer; | |
165 | ||
166 | if (pkg->type == ACPI_TYPE_PACKAGE) { | |
167 | union acpi_object *connector_count = &pkg->package.elements[0]; | |
168 | DRM_DEBUG_DRIVER("MUX info connectors: %lld\n", | |
169 | (unsigned long long)connector_count->integer.value); | |
170 | for (i = 1; i < pkg->package.count; i++) { | |
171 | union acpi_object *obj = &pkg->package.elements[i]; | |
172 | union acpi_object *connector_id = | |
173 | &obj->package.elements[0]; | |
174 | union acpi_object *info = &obj->package.elements[1]; | |
175 | DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n", | |
176 | (unsigned long long)connector_id->integer.value); | |
177 | DRM_DEBUG_DRIVER(" port id: %s\n", | |
178 | intel_dsm_port_name(info->buffer.pointer[0])); | |
179 | DRM_DEBUG_DRIVER(" display mux info: %s\n", | |
180 | intel_dsm_mux_type(info->buffer.pointer[1])); | |
181 | DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n", | |
182 | intel_dsm_mux_type(info->buffer.pointer[2])); | |
183 | DRM_DEBUG_DRIVER(" hpd mux info: %s\n", | |
184 | intel_dsm_mux_type(info->buffer.pointer[3])); | |
185 | } | |
723bfd70 JB |
186 | } |
187 | ||
188 | out: | |
189 | kfree(output.pointer); | |
190 | } | |
191 | ||
723bfd70 JB |
192 | static bool intel_dsm_pci_probe(struct pci_dev *pdev) |
193 | { | |
194 | acpi_handle dhandle, intel_handle; | |
195 | acpi_status status; | |
196 | int ret; | |
197 | ||
198 | dhandle = DEVICE_ACPI_HANDLE(&pdev->dev); | |
199 | if (!dhandle) | |
200 | return false; | |
201 | ||
202 | status = acpi_get_handle(dhandle, "_DSM", &intel_handle); | |
203 | if (ACPI_FAILURE(status)) { | |
204 | DRM_DEBUG_KMS("no _DSM method for intel device\n"); | |
205 | return false; | |
206 | } | |
207 | ||
208 | ret = intel_dsm(dhandle, INTEL_DSM_FN_SUPPORTED_FUNCTIONS, 0); | |
209 | if (ret < 0) { | |
0b8ecdda | 210 | DRM_DEBUG_KMS("failed to get supported _DSM functions\n"); |
723bfd70 JB |
211 | return false; |
212 | } | |
213 | ||
214 | intel_dsm_priv.dhandle = dhandle; | |
215 | ||
216 | intel_dsm_platform_mux_info(); | |
217 | return true; | |
218 | } | |
219 | ||
220 | static bool intel_dsm_detect(void) | |
221 | { | |
222 | char acpi_method_name[255] = { 0 }; | |
223 | struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; | |
224 | struct pci_dev *pdev = NULL; | |
225 | bool has_dsm = false; | |
226 | int vga_count = 0; | |
227 | ||
228 | while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { | |
229 | vga_count++; | |
230 | has_dsm |= intel_dsm_pci_probe(pdev); | |
231 | } | |
232 | ||
233 | if (vga_count == 2 && has_dsm) { | |
234 | acpi_get_name(intel_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer); | |
235 | DRM_DEBUG_DRIVER("VGA switcheroo: detected DSM switching method %s handle\n", | |
236 | acpi_method_name); | |
237 | return true; | |
238 | } | |
239 | ||
240 | return false; | |
241 | } | |
242 | ||
243 | void intel_register_dsm_handler(void) | |
244 | { | |
245 | if (!intel_dsm_detect()) | |
246 | return; | |
723bfd70 JB |
247 | } |
248 | ||
249 | void intel_unregister_dsm_handler(void) | |
250 | { | |
723bfd70 | 251 | } |