Commit | Line | Data |
---|---|---|
6ee73861 BS |
1 | #include <linux/pci.h> |
2 | #include <linux/acpi.h> | |
5a0e3ad6 | 3 | #include <linux/slab.h> |
8116188f | 4 | #include <linux/mxm-wmi.h> |
6a9ee8af | 5 | #include <linux/vga_switcheroo.h> |
612a9aab | 6 | #include <drm/drm_edid.h> |
8b48463f | 7 | #include <acpi/video.h> |
c0077061 BS |
8 | |
9 | #include "nouveau_drm.h" | |
10 | #include "nouveau_acpi.h" | |
11 | ||
6ee73861 BS |
12 | #define NOUVEAU_DSM_LED 0x02 |
13 | #define NOUVEAU_DSM_LED_STATE 0x00 | |
14 | #define NOUVEAU_DSM_LED_OFF 0x10 | |
15 | #define NOUVEAU_DSM_LED_STAMINA 0x11 | |
16 | #define NOUVEAU_DSM_LED_SPEED 0x12 | |
17 | ||
18 | #define NOUVEAU_DSM_POWER 0x03 | |
19 | #define NOUVEAU_DSM_POWER_STATE 0x00 | |
20 | #define NOUVEAU_DSM_POWER_SPEED 0x01 | |
21 | #define NOUVEAU_DSM_POWER_STAMINA 0x02 | |
22 | ||
5addcf0a DA |
23 | #define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A |
24 | #define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B | |
25 | ||
26 | #define NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 (3 << 24) | |
27 | #define NOUVEAU_DSM_OPTIMUS_NO_POWERDOWN_PS3 (2 << 24) | |
28 | #define NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED (1) | |
29 | ||
30 | #define NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN (NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 | NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED) | |
31 | ||
32 | /* result of the optimus caps function */ | |
33 | #define OPTIMUS_ENABLED (1 << 0) | |
34 | #define OPTIMUS_STATUS_MASK (3 << 3) | |
35 | #define OPTIMUS_STATUS_OFF (0 << 3) | |
36 | #define OPTIMUS_STATUS_ON_ENABLED (1 << 3) | |
37 | #define OPTIMUS_STATUS_PWR_STABLE (3 << 3) | |
38 | #define OPTIMUS_DISPLAY_HOTPLUG (1 << 6) | |
39 | #define OPTIMUS_CAPS_MASK (7 << 24) | |
40 | #define OPTIMUS_DYNAMIC_PWR_CAP (1 << 24) | |
41 | ||
42 | #define OPTIMUS_AUDIO_CAPS_MASK (3 << 27) | |
43 | #define OPTIMUS_HDA_CODEC_MASK (2 << 27) /* hda bios control */ | |
d099230c | 44 | |
6a9ee8af DA |
45 | static struct nouveau_dsm_priv { |
46 | bool dsm_detected; | |
f19467c5 | 47 | bool optimus_detected; |
6a9ee8af | 48 | acpi_handle dhandle; |
afeb3e11 | 49 | acpi_handle rom_handle; |
6a9ee8af DA |
50 | } nouveau_dsm_priv; |
51 | ||
c839d748 DA |
52 | bool nouveau_is_optimus(void) { |
53 | return nouveau_dsm_priv.optimus_detected; | |
54 | } | |
55 | ||
56 | bool nouveau_is_v1_dsm(void) { | |
57 | return nouveau_dsm_priv.dsm_detected; | |
58 | } | |
59 | ||
f19467c5 DA |
60 | #define NOUVEAU_DSM_HAS_MUX 0x1 |
61 | #define NOUVEAU_DSM_HAS_OPT 0x2 | |
62 | ||
6a9ee8af DA |
63 | static const char nouveau_dsm_muid[] = { |
64 | 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D, | |
65 | 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4, | |
66 | }; | |
6ee73861 | 67 | |
f19467c5 DA |
68 | static const char nouveau_op_dsm_muid[] = { |
69 | 0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47, | |
70 | 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0, | |
71 | }; | |
72 | ||
73 | static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result) | |
74 | { | |
75 | struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; | |
76 | struct acpi_object_list input; | |
77 | union acpi_object params[4]; | |
78 | union acpi_object *obj; | |
d099230c PL |
79 | int i, err; |
80 | char args_buff[4]; | |
f19467c5 DA |
81 | |
82 | input.count = 4; | |
83 | input.pointer = params; | |
84 | params[0].type = ACPI_TYPE_BUFFER; | |
85 | params[0].buffer.length = sizeof(nouveau_op_dsm_muid); | |
86 | params[0].buffer.pointer = (char *)nouveau_op_dsm_muid; | |
87 | params[1].type = ACPI_TYPE_INTEGER; | |
88 | params[1].integer.value = 0x00000100; | |
89 | params[2].type = ACPI_TYPE_INTEGER; | |
90 | params[2].integer.value = func; | |
91 | params[3].type = ACPI_TYPE_BUFFER; | |
d099230c PL |
92 | params[3].buffer.length = 4; |
93 | /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */ | |
94 | for (i = 0; i < 4; i++) | |
95 | args_buff[i] = (arg >> i * 8) & 0xFF; | |
96 | params[3].buffer.pointer = args_buff; | |
f19467c5 DA |
97 | |
98 | err = acpi_evaluate_object(handle, "_DSM", &input, &output); | |
99 | if (err) { | |
100 | printk(KERN_INFO "failed to evaluate _DSM: %d\n", err); | |
101 | return err; | |
102 | } | |
103 | ||
104 | obj = (union acpi_object *)output.pointer; | |
105 | ||
106 | if (obj->type == ACPI_TYPE_INTEGER) | |
107 | if (obj->integer.value == 0x80000002) { | |
108 | return -ENODEV; | |
109 | } | |
110 | ||
111 | if (obj->type == ACPI_TYPE_BUFFER) { | |
112 | if (obj->buffer.length == 4 && result) { | |
113 | *result = 0; | |
114 | *result |= obj->buffer.pointer[0]; | |
115 | *result |= (obj->buffer.pointer[1] << 8); | |
116 | *result |= (obj->buffer.pointer[2] << 16); | |
117 | *result |= (obj->buffer.pointer[3] << 24); | |
118 | } | |
119 | } | |
120 | ||
121 | kfree(output.pointer); | |
122 | return 0; | |
123 | } | |
124 | ||
6e86e041 | 125 | static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result) |
6a9ee8af | 126 | { |
6ee73861 BS |
127 | struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; |
128 | struct acpi_object_list input; | |
129 | union acpi_object params[4]; | |
130 | union acpi_object *obj; | |
131 | int err; | |
132 | ||
6ee73861 BS |
133 | input.count = 4; |
134 | input.pointer = params; | |
135 | params[0].type = ACPI_TYPE_BUFFER; | |
6a9ee8af DA |
136 | params[0].buffer.length = sizeof(nouveau_dsm_muid); |
137 | params[0].buffer.pointer = (char *)nouveau_dsm_muid; | |
6ee73861 BS |
138 | params[1].type = ACPI_TYPE_INTEGER; |
139 | params[1].integer.value = 0x00000102; | |
140 | params[2].type = ACPI_TYPE_INTEGER; | |
141 | params[2].integer.value = func; | |
142 | params[3].type = ACPI_TYPE_INTEGER; | |
143 | params[3].integer.value = arg; | |
144 | ||
145 | err = acpi_evaluate_object(handle, "_DSM", &input, &output); | |
146 | if (err) { | |
6a9ee8af | 147 | printk(KERN_INFO "failed to evaluate _DSM: %d\n", err); |
6ee73861 BS |
148 | return err; |
149 | } | |
150 | ||
151 | obj = (union acpi_object *)output.pointer; | |
152 | ||
153 | if (obj->type == ACPI_TYPE_INTEGER) | |
154 | if (obj->integer.value == 0x80000002) | |
155 | return -ENODEV; | |
156 | ||
157 | if (obj->type == ACPI_TYPE_BUFFER) { | |
158 | if (obj->buffer.length == 4 && result) { | |
159 | *result = 0; | |
160 | *result |= obj->buffer.pointer[0]; | |
161 | *result |= (obj->buffer.pointer[1] << 8); | |
162 | *result |= (obj->buffer.pointer[2] << 16); | |
163 | *result |= (obj->buffer.pointer[3] << 24); | |
164 | } | |
165 | } | |
166 | ||
167 | kfree(output.pointer); | |
168 | return 0; | |
169 | } | |
170 | ||
9075e85f PL |
171 | /* Returns 1 if a DSM function is usable and 0 otherwise */ |
172 | static int nouveau_test_dsm(acpi_handle test_handle, | |
173 | int (*dsm_func)(acpi_handle, int, int, uint32_t *), | |
174 | int sfnc) | |
175 | { | |
176 | u32 result = 0; | |
177 | ||
178 | /* Function 0 returns a Buffer containing available functions. The args | |
179 | * parameter is ignored for function 0, so just put 0 in it */ | |
180 | if (dsm_func(test_handle, 0, 0, &result)) | |
181 | return 0; | |
182 | ||
183 | /* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If | |
184 | * the n-th bit is enabled, function n is supported */ | |
185 | return result & 1 && result & (1 << sfnc); | |
186 | } | |
187 | ||
6a9ee8af | 188 | static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id) |
6ee73861 | 189 | { |
000703f4 | 190 | mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0); |
8116188f | 191 | mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0); |
6a9ee8af DA |
192 | return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL); |
193 | } | |
194 | ||
195 | static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state) | |
196 | { | |
197 | int arg; | |
198 | if (state == VGA_SWITCHEROO_ON) | |
199 | arg = NOUVEAU_DSM_POWER_SPEED; | |
200 | else | |
201 | arg = NOUVEAU_DSM_POWER_STAMINA; | |
202 | nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL); | |
203 | return 0; | |
204 | } | |
205 | ||
206 | static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id) | |
207 | { | |
c839d748 | 208 | if (!nouveau_dsm_priv.dsm_detected) |
d099230c | 209 | return 0; |
6a9ee8af | 210 | if (id == VGA_SWITCHEROO_IGD) |
fc5ea29d | 211 | return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA); |
6a9ee8af | 212 | else |
fc5ea29d | 213 | return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED); |
6a9ee8af | 214 | } |
6ee73861 | 215 | |
6a9ee8af DA |
216 | static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id, |
217 | enum vga_switcheroo_state state) | |
218 | { | |
219 | if (id == VGA_SWITCHEROO_IGD) | |
220 | return 0; | |
221 | ||
d099230c PL |
222 | /* Optimus laptops have the card already disabled in |
223 | * nouveau_switcheroo_set_state */ | |
c839d748 | 224 | if (!nouveau_dsm_priv.dsm_detected) |
d099230c PL |
225 | return 0; |
226 | ||
fc5ea29d | 227 | return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state); |
6a9ee8af DA |
228 | } |
229 | ||
6a9ee8af | 230 | static int nouveau_dsm_get_client_id(struct pci_dev *pdev) |
6ee73861 | 231 | { |
d1fbd923 DA |
232 | /* easy option one - intel vendor ID means Integrated */ |
233 | if (pdev->vendor == PCI_VENDOR_ID_INTEL) | |
6a9ee8af | 234 | return VGA_SWITCHEROO_IGD; |
d1fbd923 DA |
235 | |
236 | /* is this device on Bus 0? - this may need improving */ | |
237 | if (pdev->bus->number == 0) | |
238 | return VGA_SWITCHEROO_IGD; | |
239 | ||
240 | return VGA_SWITCHEROO_DIS; | |
6a9ee8af DA |
241 | } |
242 | ||
243 | static struct vga_switcheroo_handler nouveau_dsm_handler = { | |
244 | .switchto = nouveau_dsm_switchto, | |
245 | .power_state = nouveau_dsm_power_state, | |
6a9ee8af DA |
246 | .get_client_id = nouveau_dsm_get_client_id, |
247 | }; | |
6ee73861 | 248 | |
f19467c5 | 249 | static int nouveau_dsm_pci_probe(struct pci_dev *pdev) |
6a9ee8af | 250 | { |
187b5b5d | 251 | acpi_handle dhandle; |
9075e85f | 252 | int retval = 0; |
6a9ee8af | 253 | |
3a83f992 | 254 | dhandle = ACPI_HANDLE(&pdev->dev); |
6a9ee8af DA |
255 | if (!dhandle) |
256 | return false; | |
afeb3e11 | 257 | |
187b5b5d | 258 | if (!acpi_has_method(dhandle, "_DSM")) |
6ee73861 BS |
259 | return false; |
260 | ||
9075e85f | 261 | if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER)) |
f19467c5 DA |
262 | retval |= NOUVEAU_DSM_HAS_MUX; |
263 | ||
9075e85f | 264 | if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm, |
5addcf0a | 265 | NOUVEAU_DSM_OPTIMUS_CAPS)) |
f19467c5 DA |
266 | retval |= NOUVEAU_DSM_HAS_OPT; |
267 | ||
5addcf0a DA |
268 | if (retval & NOUVEAU_DSM_HAS_OPT) { |
269 | uint32_t result; | |
270 | nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0, | |
271 | &result); | |
272 | dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n", | |
273 | (result & OPTIMUS_ENABLED) ? "enabled" : "disabled", | |
274 | (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "", | |
275 | (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : ""); | |
276 | } | |
f19467c5 DA |
277 | if (retval) |
278 | nouveau_dsm_priv.dhandle = dhandle; | |
6ee73861 | 279 | |
f19467c5 | 280 | return retval; |
6ee73861 | 281 | } |
6a9ee8af DA |
282 | |
283 | static bool nouveau_dsm_detect(void) | |
284 | { | |
285 | char acpi_method_name[255] = { 0 }; | |
286 | struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; | |
287 | struct pci_dev *pdev = NULL; | |
288 | int has_dsm = 0; | |
addde4ec | 289 | int has_optimus = 0; |
6a9ee8af | 290 | int vga_count = 0; |
8116188f | 291 | bool guid_valid; |
f19467c5 DA |
292 | int retval; |
293 | bool ret = false; | |
8116188f | 294 | |
f19467c5 | 295 | /* lookup the MXM GUID */ |
8116188f | 296 | guid_valid = mxm_wmi_supported(); |
8116188f | 297 | |
f19467c5 DA |
298 | if (guid_valid) |
299 | printk("MXM: GUID detected in BIOS\n"); | |
afeb3e11 | 300 | |
f19467c5 | 301 | /* now do DSM detection */ |
6a9ee8af DA |
302 | while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { |
303 | vga_count++; | |
304 | ||
f19467c5 | 305 | retval = nouveau_dsm_pci_probe(pdev); |
f19467c5 DA |
306 | if (retval & NOUVEAU_DSM_HAS_MUX) |
307 | has_dsm |= 1; | |
308 | if (retval & NOUVEAU_DSM_HAS_OPT) | |
309 | has_optimus = 1; | |
6a9ee8af DA |
310 | } |
311 | ||
4c60fac1 EV |
312 | while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) { |
313 | vga_count++; | |
314 | ||
315 | retval = nouveau_dsm_pci_probe(pdev); | |
316 | if (retval & NOUVEAU_DSM_HAS_MUX) | |
317 | has_dsm |= 1; | |
318 | if (retval & NOUVEAU_DSM_HAS_OPT) | |
319 | has_optimus = 1; | |
320 | } | |
321 | ||
c839d748 DA |
322 | /* find the optimus DSM or the old v1 DSM */ |
323 | if (has_optimus == 1) { | |
d099230c PL |
324 | acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, |
325 | &buffer); | |
c839d748 | 326 | printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n", |
d099230c | 327 | acpi_method_name); |
c839d748 | 328 | nouveau_dsm_priv.optimus_detected = true; |
f19467c5 | 329 | ret = true; |
c839d748 | 330 | } else if (vga_count == 2 && has_dsm && guid_valid) { |
d099230c PL |
331 | acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, |
332 | &buffer); | |
c839d748 | 333 | printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n", |
d099230c | 334 | acpi_method_name); |
c839d748 | 335 | nouveau_dsm_priv.dsm_detected = true; |
d099230c PL |
336 | ret = true; |
337 | } | |
f19467c5 | 338 | |
c839d748 | 339 | |
f19467c5 | 340 | return ret; |
6a9ee8af DA |
341 | } |
342 | ||
343 | void nouveau_register_dsm_handler(void) | |
344 | { | |
345 | bool r; | |
346 | ||
347 | r = nouveau_dsm_detect(); | |
348 | if (!r) | |
349 | return; | |
350 | ||
351 | vga_switcheroo_register_handler(&nouveau_dsm_handler); | |
352 | } | |
353 | ||
d099230c PL |
354 | /* Must be called for Optimus models before the card can be turned off */ |
355 | void nouveau_switcheroo_optimus_dsm(void) | |
356 | { | |
357 | u32 result = 0; | |
358 | if (!nouveau_dsm_priv.optimus_detected) | |
359 | return; | |
360 | ||
5addcf0a DA |
361 | nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS, |
362 | 0x3, &result); | |
363 | ||
364 | nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, | |
365 | NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result); | |
366 | ||
d099230c PL |
367 | } |
368 | ||
6a9ee8af DA |
369 | void nouveau_unregister_dsm_handler(void) |
370 | { | |
2f3787aa AH |
371 | if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected) |
372 | vga_switcheroo_unregister_handler(); | |
6a9ee8af | 373 | } |
afeb3e11 DA |
374 | |
375 | /* retrieve the ROM in 4k blocks */ | |
376 | static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios, | |
377 | int offset, int len) | |
378 | { | |
379 | acpi_status status; | |
380 | union acpi_object rom_arg_elements[2], *obj; | |
381 | struct acpi_object_list rom_arg; | |
382 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL}; | |
383 | ||
384 | rom_arg.count = 2; | |
385 | rom_arg.pointer = &rom_arg_elements[0]; | |
386 | ||
387 | rom_arg_elements[0].type = ACPI_TYPE_INTEGER; | |
388 | rom_arg_elements[0].integer.value = offset; | |
389 | ||
390 | rom_arg_elements[1].type = ACPI_TYPE_INTEGER; | |
391 | rom_arg_elements[1].integer.value = len; | |
392 | ||
393 | status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer); | |
394 | if (ACPI_FAILURE(status)) { | |
395 | printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status)); | |
396 | return -ENODEV; | |
397 | } | |
398 | obj = (union acpi_object *)buffer.pointer; | |
399 | memcpy(bios+offset, obj->buffer.pointer, len); | |
400 | kfree(buffer.pointer); | |
401 | return len; | |
402 | } | |
403 | ||
404 | bool nouveau_acpi_rom_supported(struct pci_dev *pdev) | |
405 | { | |
406 | acpi_status status; | |
407 | acpi_handle dhandle, rom_handle; | |
408 | ||
f19467c5 | 409 | if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected) |
afeb3e11 DA |
410 | return false; |
411 | ||
3a83f992 | 412 | dhandle = ACPI_HANDLE(&pdev->dev); |
afeb3e11 DA |
413 | if (!dhandle) |
414 | return false; | |
415 | ||
416 | status = acpi_get_handle(dhandle, "_ROM", &rom_handle); | |
417 | if (ACPI_FAILURE(status)) | |
418 | return false; | |
419 | ||
420 | nouveau_dsm_priv.rom_handle = rom_handle; | |
421 | return true; | |
422 | } | |
423 | ||
424 | int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len) | |
425 | { | |
426 | return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len); | |
427 | } | |
a6ed76d7 | 428 | |
c0077061 | 429 | void * |
a6ed76d7 BS |
430 | nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector) |
431 | { | |
a6ed76d7 BS |
432 | struct acpi_device *acpidev; |
433 | acpi_handle handle; | |
434 | int type, ret; | |
435 | void *edid; | |
436 | ||
437 | switch (connector->connector_type) { | |
438 | case DRM_MODE_CONNECTOR_LVDS: | |
439 | case DRM_MODE_CONNECTOR_eDP: | |
440 | type = ACPI_VIDEO_DISPLAY_LCD; | |
441 | break; | |
442 | default: | |
c0077061 | 443 | return NULL; |
a6ed76d7 BS |
444 | } |
445 | ||
3a83f992 | 446 | handle = ACPI_HANDLE(&dev->pdev->dev); |
a6ed76d7 | 447 | if (!handle) |
c0077061 | 448 | return NULL; |
a6ed76d7 BS |
449 | |
450 | ret = acpi_bus_get_device(handle, &acpidev); | |
451 | if (ret) | |
c0077061 | 452 | return NULL; |
a6ed76d7 BS |
453 | |
454 | ret = acpi_video_get_edid(acpidev, type, -1, &edid); | |
455 | if (ret < 0) | |
c0077061 | 456 | return NULL; |
a6ed76d7 | 457 | |
c0077061 | 458 | return kmemdup(edid, EDID_LENGTH, GFP_KERNEL); |
a6ed76d7 | 459 | } |