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 <drm/drmP.h> |
10 | #include "i915_drv.h" |
11 | |
12 | #ifdef CONFIG_ACPI |
13 | |
14 | #ifdef __NetBSD__ |
15 | #include <dev/acpi/acpireg.h> |
16 | #define _COMPONENT ACPI_BUTTON_COMPONENT |
17 | ACPI_MODULE_NAME("acpi_intel_brightness" ) |
18 | |
19 | static ACPI_OBJECT * |
20 | acpi_evaluate_dsm(ACPI_HANDLE handle, const uint8_t *uuid, int rev, int func, |
21 | ACPI_OBJECT *argv4) |
22 | { |
23 | ACPI_OBJECT_LIST arg; |
24 | ACPI_OBJECT params[4]; |
25 | ACPI_BUFFER buf; |
26 | ACPI_STATUS rv; |
27 | |
28 | if (handle == NULL) |
29 | handle = ACPI_ROOT_OBJECT; |
30 | |
31 | arg.Count = 4; |
32 | arg.Pointer = params; |
33 | params[0].Type = ACPI_TYPE_BUFFER; |
34 | params[0].Buffer.Length = 16; |
35 | params[0].Buffer.Pointer = (char *)__UNCONST(uuid); |
36 | params[1].Type = ACPI_TYPE_INTEGER; |
37 | params[1].Integer.Value = rev; |
38 | params[2].Type = ACPI_TYPE_INTEGER; |
39 | params[2].Integer.Value = func; |
40 | if (argv4 != NULL) { |
41 | params[3] = *argv4; |
42 | } else { |
43 | params[3].Type = ACPI_TYPE_PACKAGE; |
44 | params[3].Package.Count = 0; |
45 | params[3].Package.Elements = NULL; |
46 | } |
47 | |
48 | buf.Pointer = NULL; |
49 | buf.Length = ACPI_ALLOCATE_LOCAL_BUFFER; |
50 | |
51 | rv = AcpiEvaluateObject(handle, "_DSM" , &arg, &buf); |
52 | if (ACPI_SUCCESS(rv)) |
53 | return (ACPI_OBJECT *)buf.Pointer; |
54 | return NULL; |
55 | } |
56 | |
57 | static inline ACPI_OBJECT * |
58 | acpi_evaluate_dsm_typed(ACPI_HANDLE handle, const uint8_t *uuid, int rev, |
59 | int func, ACPI_OBJECT *argv4, ACPI_OBJECT_TYPE type) |
60 | { |
61 | ACPI_OBJECT *obj; |
62 | |
63 | obj = acpi_evaluate_dsm(handle, uuid, rev, func, argv4); |
64 | if (obj != NULL && obj->Type != type) { |
65 | ACPI_FREE(obj); |
66 | obj = NULL; |
67 | } |
68 | return obj; |
69 | } |
70 | |
71 | #define ACPI_INIT_DSM_ARGV4(cnt, eles) \ |
72 | { \ |
73 | .Package.Type = ACPI_TYPE_PACKAGE, \ |
74 | .Package.Count = (cnt), \ |
75 | .Package.Elements = (eles) \ |
76 | } |
77 | |
78 | static bool |
79 | acpi_check_dsm(ACPI_HANDLE handle, const uint8_t *uuid, int rev, uint64_t funcs) |
80 | { |
81 | ACPI_OBJECT *obj; |
82 | uint64_t mask = 0; |
83 | int i; |
84 | |
85 | if (funcs == 0) |
86 | return false; |
87 | |
88 | obj = acpi_evaluate_dsm(handle, uuid, rev, 0, NULL); |
89 | if (obj == NULL) |
90 | return false; |
91 | |
92 | if (obj->Type == ACPI_TYPE_INTEGER) |
93 | mask = obj->Integer.Value; |
94 | else if (obj->Type == ACPI_TYPE_BUFFER) |
95 | for (i = 0; i < obj->Buffer.Length && i < 8; i++) |
96 | mask |= (uint64_t)obj->Buffer.Pointer[i] << (i * 8); |
97 | ACPI_FREE(obj); |
98 | |
99 | if ((mask & 0x1) == 0x1 && (mask & funcs) == funcs) |
100 | return true; |
101 | return false; |
102 | } |
103 | #endif |
104 | |
105 | #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */ |
106 | #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */ |
107 | |
108 | static struct intel_dsm_priv { |
109 | #ifdef __NetBSD__ |
110 | ACPI_HANDLE dhandle; |
111 | #else |
112 | acpi_handle dhandle; |
113 | #endif |
114 | } intel_dsm_priv; |
115 | |
116 | static const u8 intel_dsm_guid[] = { |
117 | 0xd3, 0x73, 0xd8, 0x7e, |
118 | 0xd0, 0xc2, |
119 | 0x4f, 0x4e, |
120 | 0xa8, 0x54, |
121 | 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c |
122 | }; |
123 | |
124 | static const char *intel_dsm_port_name(u8 id) |
125 | { |
126 | switch (id) { |
127 | case 0: |
128 | return "Reserved" ; |
129 | case 1: |
130 | return "Analog VGA" ; |
131 | case 2: |
132 | return "LVDS" ; |
133 | case 3: |
134 | return "Reserved" ; |
135 | case 4: |
136 | return "HDMI/DVI_B" ; |
137 | case 5: |
138 | return "HDMI/DVI_C" ; |
139 | case 6: |
140 | return "HDMI/DVI_D" ; |
141 | case 7: |
142 | return "DisplayPort_A" ; |
143 | case 8: |
144 | return "DisplayPort_B" ; |
145 | case 9: |
146 | return "DisplayPort_C" ; |
147 | case 0xa: |
148 | return "DisplayPort_D" ; |
149 | case 0xb: |
150 | case 0xc: |
151 | case 0xd: |
152 | return "Reserved" ; |
153 | case 0xe: |
154 | return "WiDi" ; |
155 | default: |
156 | return "bad type" ; |
157 | } |
158 | } |
159 | |
160 | static const char *intel_dsm_mux_type(u8 type) |
161 | { |
162 | switch (type) { |
163 | case 0: |
164 | return "unknown" ; |
165 | case 1: |
166 | return "No MUX, iGPU only" ; |
167 | case 2: |
168 | return "No MUX, dGPU only" ; |
169 | case 3: |
170 | return "MUXed between iGPU and dGPU" ; |
171 | default: |
172 | return "bad type" ; |
173 | } |
174 | } |
175 | |
176 | static void intel_dsm_platform_mux_info(void) |
177 | { |
178 | int i; |
179 | #ifdef __NetBSD__ |
180 | ACPI_OBJECT *pkg, *connector_count; |
181 | #else |
182 | union acpi_object *pkg, *connector_count; |
183 | #endif |
184 | |
185 | pkg = acpi_evaluate_dsm_typed(intel_dsm_priv.dhandle, intel_dsm_guid, |
186 | INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO, |
187 | NULL, ACPI_TYPE_PACKAGE); |
188 | if (!pkg) { |
189 | DRM_DEBUG_DRIVER("failed to evaluate _DSM\n" ); |
190 | return; |
191 | } |
192 | |
193 | #ifdef __NetBSD__ |
194 | connector_count = &pkg->Package.Elements[0]; |
195 | DRM_DEBUG_DRIVER("MUX info connectors: %lld\n" , |
196 | (unsigned long long)connector_count->Integer.Value); |
197 | for (i = 1; i < pkg->Package.Count; i++) { |
198 | ACPI_OBJECT *obj = &pkg->Package.Elements[i]; |
199 | ACPI_OBJECT *connector_id = &obj->Package.Elements[0]; |
200 | ACPI_OBJECT *info = &obj->Package.Elements[1]; |
201 | DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n" , |
202 | (unsigned long long)connector_id->Integer.Value); |
203 | DRM_DEBUG_DRIVER(" port id: %s\n" , |
204 | intel_dsm_port_name(info->Buffer.Pointer[0])); |
205 | DRM_DEBUG_DRIVER(" display mux info: %s\n" , |
206 | intel_dsm_mux_type(info->Buffer.Pointer[1])); |
207 | DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n" , |
208 | intel_dsm_mux_type(info->Buffer.Pointer[2])); |
209 | DRM_DEBUG_DRIVER(" hpd mux info: %s\n" , |
210 | intel_dsm_mux_type(info->Buffer.Pointer[3])); |
211 | } |
212 | #else |
213 | connector_count = &pkg->package.elements[0]; |
214 | DRM_DEBUG_DRIVER("MUX info connectors: %lld\n" , |
215 | (unsigned long long)connector_count->integer.value); |
216 | for (i = 1; i < pkg->package.count; i++) { |
217 | union acpi_object *obj = &pkg->package.elements[i]; |
218 | union acpi_object *connector_id = &obj->package.elements[0]; |
219 | union acpi_object *info = &obj->package.elements[1]; |
220 | DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n" , |
221 | (unsigned long long)connector_id->integer.value); |
222 | DRM_DEBUG_DRIVER(" port id: %s\n" , |
223 | intel_dsm_port_name(info->buffer.pointer[0])); |
224 | DRM_DEBUG_DRIVER(" display mux info: %s\n" , |
225 | intel_dsm_mux_type(info->buffer.pointer[1])); |
226 | DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n" , |
227 | intel_dsm_mux_type(info->buffer.pointer[2])); |
228 | DRM_DEBUG_DRIVER(" hpd mux info: %s\n" , |
229 | intel_dsm_mux_type(info->buffer.pointer[3])); |
230 | } |
231 | #endif |
232 | ACPI_FREE(pkg); |
233 | } |
234 | |
235 | #ifdef __NetBSD__ |
236 | static bool intel_dsm_pci_probe(ACPI_HANDLE dhandle) |
237 | #else |
238 | static bool intel_dsm_pci_probe(struct pci_dev *pdev) |
239 | #endif |
240 | { |
241 | #ifndef __NetBSD__ |
242 | acpi_handle dhandle; |
243 | |
244 | dhandle = ACPI_HANDLE(&pdev->dev); |
245 | #endif |
246 | if (!dhandle) |
247 | return false; |
248 | |
249 | if (!acpi_check_dsm(dhandle, intel_dsm_guid, INTEL_DSM_REVISION_ID, |
250 | 1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) { |
251 | DRM_DEBUG_KMS("no _DSM method for intel device\n" ); |
252 | return false; |
253 | } |
254 | |
255 | intel_dsm_priv.dhandle = dhandle; |
256 | intel_dsm_platform_mux_info(); |
257 | |
258 | return true; |
259 | } |
260 | |
261 | #ifdef __NetBSD__ |
262 | |
263 | static int vga_count; |
264 | static bool has_dsm; |
265 | |
266 | /* XXX from sys/dev/pci/vga_pcivar.h */ |
267 | #define DEVICE_IS_VGA_PCI(class, id) \ |
268 | (((PCI_CLASS(class) == PCI_CLASS_DISPLAY && \ |
269 | PCI_SUBCLASS(class) == PCI_SUBCLASS_DISPLAY_VGA) || \ |
270 | (PCI_CLASS(class) == PCI_CLASS_PREHISTORIC && \ |
271 | PCI_SUBCLASS(class) == PCI_SUBCLASS_PREHISTORIC_VGA)) ? 1 : 0) |
272 | |
273 | static int |
274 | intel_dsm_vga_match(const struct pci_attach_args *pa) |
275 | { |
276 | |
277 | if (!DEVICE_IS_VGA_PCI(pa->pa_class, pa->pa_id)) |
278 | return 0; |
279 | |
280 | vga_count++; |
281 | struct acpi_devnode *node = acpi_pcidev_find(0 /*XXX segment*/, |
282 | pa->pa_bus, pa->pa_device, pa->pa_function); |
283 | if (node != NULL) |
284 | has_dsm |= intel_dsm_pci_probe(node->ad_handle); |
285 | return 0; |
286 | } |
287 | |
288 | static bool intel_dsm_detect(struct drm_device *dev) |
289 | { |
290 | char acpi_method_name[255] = { 0 }; |
291 | |
292 | vga_count = 0; |
293 | has_dsm = false; |
294 | pci_find_device(&dev->pdev->pd_pa, intel_dsm_vga_match); |
295 | |
296 | if (vga_count == 2 && has_dsm) { |
297 | const char *name = acpi_name(intel_dsm_priv.dhandle); |
298 | strlcpy(acpi_method_name, name, sizeof(acpi_method_name)); |
299 | DRM_DEBUG_DRIVER("VGA switcheroo: detected DSM switching method %s handle\n" , |
300 | acpi_method_name); |
301 | return true; |
302 | } |
303 | |
304 | return false; |
305 | } |
306 | #else |
307 | static bool intel_dsm_detect(void) |
308 | { |
309 | char acpi_method_name[255] = { 0 }; |
310 | struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; |
311 | struct pci_dev *pdev = NULL; |
312 | bool has_dsm = false; |
313 | int vga_count = 0; |
314 | |
315 | while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { |
316 | vga_count++; |
317 | has_dsm |= intel_dsm_pci_probe(pdev); |
318 | } |
319 | |
320 | if (vga_count == 2 && has_dsm) { |
321 | acpi_get_name(intel_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer); |
322 | DRM_DEBUG_DRIVER("VGA switcheroo: detected DSM switching method %s handle\n" , |
323 | acpi_method_name); |
324 | return true; |
325 | } |
326 | |
327 | return false; |
328 | } |
329 | #endif |
330 | |
331 | #ifdef __NetBSD__ |
332 | void intel_register_dsm_handler(struct drm_device *dev) |
333 | { |
334 | if (!intel_dsm_detect(dev)) |
335 | return; |
336 | } |
337 | #else |
338 | void intel_register_dsm_handler(void) |
339 | { |
340 | if (!intel_dsm_detect()) |
341 | return; |
342 | } |
343 | #endif |
344 | |
345 | void intel_unregister_dsm_handler(void) |
346 | { |
347 | } |
348 | |
349 | #endif /* CONFIG_ACPI */ |
350 | |