diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_acpi.c')
-rw-r--r-- | drivers/gpu/drm/i915/intel_acpi.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_acpi.c b/drivers/gpu/drm/i915/intel_acpi.c new file mode 100644 index 000000000000..2cb8e0b9f1ee --- /dev/null +++ b/drivers/gpu/drm/i915/intel_acpi.c | |||
@@ -0,0 +1,252 @@ | |||
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 | |||
11 | #include "drmP.h" | ||
12 | |||
13 | #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */ | ||
14 | |||
15 | #define INTEL_DSM_FN_SUPPORTED_FUNCTIONS 0 /* No args */ | ||
16 | #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */ | ||
17 | |||
18 | static struct intel_dsm_priv { | ||
19 | acpi_handle dhandle; | ||
20 | } intel_dsm_priv; | ||
21 | |||
22 | static const u8 intel_dsm_guid[] = { | ||
23 | 0xd3, 0x73, 0xd8, 0x7e, | ||
24 | 0xd0, 0xc2, | ||
25 | 0x4f, 0x4e, | ||
26 | 0xa8, 0x54, | ||
27 | 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c | ||
28 | }; | ||
29 | |||
30 | static int intel_dsm(acpi_handle handle, int func, int arg) | ||
31 | { | ||
32 | struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; | ||
33 | struct acpi_object_list input; | ||
34 | union acpi_object params[4]; | ||
35 | union acpi_object *obj; | ||
36 | u32 result; | ||
37 | int ret = 0; | ||
38 | |||
39 | input.count = 4; | ||
40 | input.pointer = params; | ||
41 | params[0].type = ACPI_TYPE_BUFFER; | ||
42 | params[0].buffer.length = sizeof(intel_dsm_guid); | ||
43 | params[0].buffer.pointer = (char *)intel_dsm_guid; | ||
44 | params[1].type = ACPI_TYPE_INTEGER; | ||
45 | params[1].integer.value = INTEL_DSM_REVISION_ID; | ||
46 | params[2].type = ACPI_TYPE_INTEGER; | ||
47 | params[2].integer.value = func; | ||
48 | params[3].type = ACPI_TYPE_INTEGER; | ||
49 | params[3].integer.value = arg; | ||
50 | |||
51 | ret = acpi_evaluate_object(handle, "_DSM", &input, &output); | ||
52 | if (ret) { | ||
53 | DRM_DEBUG_DRIVER("failed to evaluate _DSM: %d\n", ret); | ||
54 | return ret; | ||
55 | } | ||
56 | |||
57 | obj = (union acpi_object *)output.pointer; | ||
58 | |||
59 | result = 0; | ||
60 | switch (obj->type) { | ||
61 | case ACPI_TYPE_INTEGER: | ||
62 | result = obj->integer.value; | ||
63 | break; | ||
64 | |||
65 | case ACPI_TYPE_BUFFER: | ||
66 | if (obj->buffer.length == 4) { | ||
67 | result =(obj->buffer.pointer[0] | | ||
68 | (obj->buffer.pointer[1] << 8) | | ||
69 | (obj->buffer.pointer[2] << 16) | | ||
70 | (obj->buffer.pointer[3] << 24)); | ||
71 | break; | ||
72 | } | ||
73 | default: | ||
74 | ret = -EINVAL; | ||
75 | break; | ||
76 | } | ||
77 | if (result == 0x80000002) | ||
78 | ret = -ENODEV; | ||
79 | |||
80 | kfree(output.pointer); | ||
81 | return ret; | ||
82 | } | ||
83 | |||
84 | static char *intel_dsm_port_name(u8 id) | ||
85 | { | ||
86 | switch (id) { | ||
87 | case 0: | ||
88 | return "Reserved"; | ||
89 | case 1: | ||
90 | return "Analog VGA"; | ||
91 | case 2: | ||
92 | return "LVDS"; | ||
93 | case 3: | ||
94 | return "Reserved"; | ||
95 | case 4: | ||
96 | return "HDMI/DVI_B"; | ||
97 | case 5: | ||
98 | return "HDMI/DVI_C"; | ||
99 | case 6: | ||
100 | return "HDMI/DVI_D"; | ||
101 | case 7: | ||
102 | return "DisplayPort_A"; | ||
103 | case 8: | ||
104 | return "DisplayPort_B"; | ||
105 | case 9: | ||
106 | return "DisplayPort_C"; | ||
107 | case 0xa: | ||
108 | return "DisplayPort_D"; | ||
109 | case 0xb: | ||
110 | case 0xc: | ||
111 | case 0xd: | ||
112 | return "Reserved"; | ||
113 | case 0xe: | ||
114 | return "WiDi"; | ||
115 | default: | ||
116 | return "bad type"; | ||
117 | } | ||
118 | } | ||
119 | |||
120 | static char *intel_dsm_mux_type(u8 type) | ||
121 | { | ||
122 | switch (type) { | ||
123 | case 0: | ||
124 | return "unknown"; | ||
125 | case 1: | ||
126 | return "No MUX, iGPU only"; | ||
127 | case 2: | ||
128 | return "No MUX, dGPU only"; | ||
129 | case 3: | ||
130 | return "MUXed between iGPU and dGPU"; | ||
131 | default: | ||
132 | return "bad type"; | ||
133 | } | ||
134 | } | ||
135 | |||
136 | static void intel_dsm_platform_mux_info(void) | ||
137 | { | ||
138 | struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; | ||
139 | struct acpi_object_list input; | ||
140 | union acpi_object params[4]; | ||
141 | union acpi_object *pkg; | ||
142 | int i, ret; | ||
143 | |||
144 | input.count = 4; | ||
145 | input.pointer = params; | ||
146 | params[0].type = ACPI_TYPE_BUFFER; | ||
147 | params[0].buffer.length = sizeof(intel_dsm_guid); | ||
148 | params[0].buffer.pointer = (char *)intel_dsm_guid; | ||
149 | params[1].type = ACPI_TYPE_INTEGER; | ||
150 | params[1].integer.value = INTEL_DSM_REVISION_ID; | ||
151 | params[2].type = ACPI_TYPE_INTEGER; | ||
152 | params[2].integer.value = INTEL_DSM_FN_PLATFORM_MUX_INFO; | ||
153 | params[3].type = ACPI_TYPE_INTEGER; | ||
154 | params[3].integer.value = 0; | ||
155 | |||
156 | ret = acpi_evaluate_object(intel_dsm_priv.dhandle, "_DSM", &input, | ||
157 | &output); | ||
158 | if (ret) { | ||
159 | DRM_DEBUG_DRIVER("failed to evaluate _DSM: %d\n", ret); | ||
160 | goto out; | ||
161 | } | ||
162 | |||
163 | pkg = (union acpi_object *)output.pointer; | ||
164 | |||
165 | if (pkg->type == ACPI_TYPE_PACKAGE) { | ||
166 | union acpi_object *connector_count = &pkg->package.elements[0]; | ||
167 | DRM_DEBUG_DRIVER("MUX info connectors: %lld\n", | ||
168 | (unsigned long long)connector_count->integer.value); | ||
169 | for (i = 1; i < pkg->package.count; i++) { | ||
170 | union acpi_object *obj = &pkg->package.elements[i]; | ||
171 | union acpi_object *connector_id = | ||
172 | &obj->package.elements[0]; | ||
173 | union acpi_object *info = &obj->package.elements[1]; | ||
174 | DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n", | ||
175 | (unsigned long long)connector_id->integer.value); | ||
176 | DRM_DEBUG_DRIVER(" port id: %s\n", | ||
177 | intel_dsm_port_name(info->buffer.pointer[0])); | ||
178 | DRM_DEBUG_DRIVER(" display mux info: %s\n", | ||
179 | intel_dsm_mux_type(info->buffer.pointer[1])); | ||
180 | DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n", | ||
181 | intel_dsm_mux_type(info->buffer.pointer[2])); | ||
182 | DRM_DEBUG_DRIVER(" hpd mux info: %s\n", | ||
183 | intel_dsm_mux_type(info->buffer.pointer[3])); | ||
184 | } | ||
185 | } else { | ||
186 | DRM_ERROR("MUX INFO call failed\n"); | ||
187 | } | ||
188 | |||
189 | out: | ||
190 | kfree(output.pointer); | ||
191 | } | ||
192 | |||
193 | static bool intel_dsm_pci_probe(struct pci_dev *pdev) | ||
194 | { | ||
195 | acpi_handle dhandle, intel_handle; | ||
196 | acpi_status status; | ||
197 | int ret; | ||
198 | |||
199 | dhandle = DEVICE_ACPI_HANDLE(&pdev->dev); | ||
200 | if (!dhandle) | ||
201 | return false; | ||
202 | |||
203 | status = acpi_get_handle(dhandle, "_DSM", &intel_handle); | ||
204 | if (ACPI_FAILURE(status)) { | ||
205 | DRM_DEBUG_KMS("no _DSM method for intel device\n"); | ||
206 | return false; | ||
207 | } | ||
208 | |||
209 | ret = intel_dsm(dhandle, INTEL_DSM_FN_SUPPORTED_FUNCTIONS, 0); | ||
210 | if (ret < 0) { | ||
211 | DRM_ERROR("failed to get supported _DSM functions\n"); | ||
212 | return false; | ||
213 | } | ||
214 | |||
215 | intel_dsm_priv.dhandle = dhandle; | ||
216 | |||
217 | intel_dsm_platform_mux_info(); | ||
218 | return true; | ||
219 | } | ||
220 | |||
221 | static bool intel_dsm_detect(void) | ||
222 | { | ||
223 | char acpi_method_name[255] = { 0 }; | ||
224 | struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; | ||
225 | struct pci_dev *pdev = NULL; | ||
226 | bool has_dsm = false; | ||
227 | int vga_count = 0; | ||
228 | |||
229 | while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { | ||
230 | vga_count++; | ||
231 | has_dsm |= intel_dsm_pci_probe(pdev); | ||
232 | } | ||
233 | |||
234 | if (vga_count == 2 && has_dsm) { | ||
235 | acpi_get_name(intel_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer); | ||
236 | DRM_DEBUG_DRIVER("VGA switcheroo: detected DSM switching method %s handle\n", | ||
237 | acpi_method_name); | ||
238 | return true; | ||
239 | } | ||
240 | |||
241 | return false; | ||
242 | } | ||
243 | |||
244 | void intel_register_dsm_handler(void) | ||
245 | { | ||
246 | if (!intel_dsm_detect()) | ||
247 | return; | ||
248 | } | ||
249 | |||
250 | void intel_unregister_dsm_handler(void) | ||
251 | { | ||
252 | } | ||