1 /*
2 * Copyright 2012 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 */
23
24 #include <linux/pci.h>
25 #include <linux/acpi.h>
26 #include <linux/slab.h>
27 #include <linux/power_supply.h>
28 #include <acpi/video.h>
29 #include <drm/drmP.h>
30 #include <drm/drm_crtc_helper.h>
31 #include "amdgpu.h"
32 #include "amdgpu_acpi.h"
33 #include "atom.h"
34
35 #define ACPI_AC_CLASS "ac_adapter"
36
37 extern void amdgpu_pm_acpi_event_handler(struct amdgpu_device *adev);
38
39 struct atif_verify_interface {
40 u16 size; /* structure size in bytes (includes size field) */
41 u16 version; /* version */
42 u32 notification_mask; /* supported notifications mask */
43 u32 function_bits; /* supported functions bit vector */
44 } __packed;
45
46 struct atif_system_params {
47 u16 size; /* structure size in bytes (includes size field) */
48 u32 valid_mask; /* valid flags mask */
49 u32 flags; /* flags */
50 u8 command_code; /* notify command code */
51 } __packed;
52
53 struct atif_sbios_requests {
54 u16 size; /* structure size in bytes (includes size field) */
55 u32 pending; /* pending sbios requests */
56 u8 panel_exp_mode; /* panel expansion mode */
57 u8 thermal_gfx; /* thermal state: target gfx controller */
58 u8 thermal_state; /* thermal state: state id (0: exit state, non-0: state) */
59 u8 forced_power_gfx; /* forced power state: target gfx controller */
60 u8 forced_power_state; /* forced power state: state id */
61 u8 system_power_src; /* system power source */
62 u8 backlight_level; /* panel backlight level (0-255) */
63 } __packed;
64
65 #define ATIF_NOTIFY_MASK 0x3
66 #define ATIF_NOTIFY_NONE 0
67 #define ATIF_NOTIFY_81 1
68 #define ATIF_NOTIFY_N 2
69
70 struct atcs_verify_interface {
71 u16 size; /* structure size in bytes (includes size field) */
72 u16 version; /* version */
73 u32 function_bits; /* supported functions bit vector */
74 } __packed;
75
76 #define ATCS_VALID_FLAGS_MASK 0x3
77
78 struct atcs_pref_req_input {
79 u16 size; /* structure size in bytes (includes size field) */
80 u16 client_id; /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
81 u16 valid_flags_mask; /* valid flags mask */
82 u16 flags; /* flags */
83 u8 req_type; /* request type */
84 u8 perf_req; /* performance request */
85 } __packed;
86
87 struct atcs_pref_req_output {
88 u16 size; /* structure size in bytes (includes size field) */
89 u8 ret_val; /* return value */
90 } __packed;
91
92 /* Call the ATIF method
93 */
94 /**
95 * amdgpu_atif_call - call an ATIF method
96 *
97 * @handle: acpi handle
98 * @function: the ATIF function to execute
99 * @params: ATIF function params
100 *
101 * Executes the requested ATIF function (all asics).
102 * Returns a pointer to the acpi output buffer.
103 */
amdgpu_atif_call(acpi_handle handle,int function,struct acpi_buffer * params)104 static union acpi_object *amdgpu_atif_call(acpi_handle handle, int function,
105 struct acpi_buffer *params)
106 {
107 acpi_status status;
108 union acpi_object atif_arg_elements[2];
109 struct acpi_object_list atif_arg;
110 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
111
112 atif_arg.count = 2;
113 atif_arg.pointer = &atif_arg_elements[0];
114
115 atif_arg_elements[0].type = ACPI_TYPE_INTEGER;
116 atif_arg_elements[0].integer.value = function;
117
118 if (params) {
119 atif_arg_elements[1].type = ACPI_TYPE_BUFFER;
120 atif_arg_elements[1].buffer.length = params->length;
121 atif_arg_elements[1].buffer.pointer = params->pointer;
122 } else {
123 /* We need a second fake parameter */
124 atif_arg_elements[1].type = ACPI_TYPE_INTEGER;
125 atif_arg_elements[1].integer.value = 0;
126 }
127
128 status = acpi_evaluate_object(handle, "ATIF", &atif_arg, &buffer);
129
130 /* Fail only if calling the method fails and ATIF is supported */
131 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
132 DRM_DEBUG_DRIVER("failed to evaluate ATIF got %s\n",
133 acpi_format_exception(status));
134 kfree(buffer.pointer);
135 return NULL;
136 }
137
138 return buffer.pointer;
139 }
140
141 /**
142 * amdgpu_atif_parse_notification - parse supported notifications
143 *
144 * @n: supported notifications struct
145 * @mask: supported notifications mask from ATIF
146 *
147 * Use the supported notifications mask from ATIF function
148 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what notifications
149 * are supported (all asics).
150 */
amdgpu_atif_parse_notification(struct amdgpu_atif_notifications * n,u32 mask)151 static void amdgpu_atif_parse_notification(struct amdgpu_atif_notifications *n, u32 mask)
152 {
153 n->display_switch = mask & ATIF_DISPLAY_SWITCH_REQUEST_SUPPORTED;
154 n->expansion_mode_change = mask & ATIF_EXPANSION_MODE_CHANGE_REQUEST_SUPPORTED;
155 n->thermal_state = mask & ATIF_THERMAL_STATE_CHANGE_REQUEST_SUPPORTED;
156 n->forced_power_state = mask & ATIF_FORCED_POWER_STATE_CHANGE_REQUEST_SUPPORTED;
157 n->system_power_state = mask & ATIF_SYSTEM_POWER_SOURCE_CHANGE_REQUEST_SUPPORTED;
158 n->display_conf_change = mask & ATIF_DISPLAY_CONF_CHANGE_REQUEST_SUPPORTED;
159 n->px_gfx_switch = mask & ATIF_PX_GFX_SWITCH_REQUEST_SUPPORTED;
160 n->brightness_change = mask & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST_SUPPORTED;
161 n->dgpu_display_event = mask & ATIF_DGPU_DISPLAY_EVENT_SUPPORTED;
162 }
163
164 /**
165 * amdgpu_atif_parse_functions - parse supported functions
166 *
167 * @f: supported functions struct
168 * @mask: supported functions mask from ATIF
169 *
170 * Use the supported functions mask from ATIF function
171 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what functions
172 * are supported (all asics).
173 */
amdgpu_atif_parse_functions(struct amdgpu_atif_functions * f,u32 mask)174 static void amdgpu_atif_parse_functions(struct amdgpu_atif_functions *f, u32 mask)
175 {
176 f->system_params = mask & ATIF_GET_SYSTEM_PARAMETERS_SUPPORTED;
177 f->sbios_requests = mask & ATIF_GET_SYSTEM_BIOS_REQUESTS_SUPPORTED;
178 f->select_active_disp = mask & ATIF_SELECT_ACTIVE_DISPLAYS_SUPPORTED;
179 f->lid_state = mask & ATIF_GET_LID_STATE_SUPPORTED;
180 f->get_tv_standard = mask & ATIF_GET_TV_STANDARD_FROM_CMOS_SUPPORTED;
181 f->set_tv_standard = mask & ATIF_SET_TV_STANDARD_IN_CMOS_SUPPORTED;
182 f->get_panel_expansion_mode = mask & ATIF_GET_PANEL_EXPANSION_MODE_FROM_CMOS_SUPPORTED;
183 f->set_panel_expansion_mode = mask & ATIF_SET_PANEL_EXPANSION_MODE_IN_CMOS_SUPPORTED;
184 f->temperature_change = mask & ATIF_TEMPERATURE_CHANGE_NOTIFICATION_SUPPORTED;
185 f->graphics_device_types = mask & ATIF_GET_GRAPHICS_DEVICE_TYPES_SUPPORTED;
186 }
187
188 /**
189 * amdgpu_atif_verify_interface - verify ATIF
190 *
191 * @handle: acpi handle
192 * @atif: amdgpu atif struct
193 *
194 * Execute the ATIF_FUNCTION_VERIFY_INTERFACE ATIF function
195 * to initialize ATIF and determine what features are supported
196 * (all asics).
197 * returns 0 on success, error on failure.
198 */
amdgpu_atif_verify_interface(acpi_handle handle,struct amdgpu_atif * atif)199 static int amdgpu_atif_verify_interface(acpi_handle handle,
200 struct amdgpu_atif *atif)
201 {
202 union acpi_object *info;
203 struct atif_verify_interface output;
204 size_t size;
205 int err = 0;
206
207 info = amdgpu_atif_call(handle, ATIF_FUNCTION_VERIFY_INTERFACE, NULL);
208 if (!info)
209 return -EIO;
210
211 memset(&output, 0, sizeof(output));
212
213 size = *(u16 *) info->buffer.pointer;
214 if (size < 12) {
215 DRM_INFO("ATIF buffer is too small: %zu\n", size);
216 err = -EINVAL;
217 goto out;
218 }
219 size = min(sizeof(output), size);
220
221 memcpy(&output, info->buffer.pointer, size);
222
223 /* TODO: check version? */
224 DRM_DEBUG_DRIVER("ATIF version %u\n", output.version);
225
226 amdgpu_atif_parse_notification(&atif->notifications, output.notification_mask);
227 amdgpu_atif_parse_functions(&atif->functions, output.function_bits);
228
229 out:
230 kfree(info);
231 return err;
232 }
233
234 /**
235 * amdgpu_atif_get_notification_params - determine notify configuration
236 *
237 * @handle: acpi handle
238 * @n: atif notification configuration struct
239 *
240 * Execute the ATIF_FUNCTION_GET_SYSTEM_PARAMETERS ATIF function
241 * to determine if a notifier is used and if so which one
242 * (all asics). This is either Notify(VGA, 0x81) or Notify(VGA, n)
243 * where n is specified in the result if a notifier is used.
244 * Returns 0 on success, error on failure.
245 */
amdgpu_atif_get_notification_params(acpi_handle handle,struct amdgpu_atif_notification_cfg * n)246 static int amdgpu_atif_get_notification_params(acpi_handle handle,
247 struct amdgpu_atif_notification_cfg *n)
248 {
249 union acpi_object *info;
250 struct atif_system_params params;
251 size_t size;
252 int err = 0;
253
254 info = amdgpu_atif_call(handle, ATIF_FUNCTION_GET_SYSTEM_PARAMETERS, NULL);
255 if (!info) {
256 err = -EIO;
257 goto out;
258 }
259
260 size = *(u16 *) info->buffer.pointer;
261 if (size < 10) {
262 err = -EINVAL;
263 goto out;
264 }
265
266 memset(¶ms, 0, sizeof(params));
267 size = min(sizeof(params), size);
268 memcpy(¶ms, info->buffer.pointer, size);
269
270 DRM_DEBUG_DRIVER("SYSTEM_PARAMS: mask = %#x, flags = %#x\n",
271 params.flags, params.valid_mask);
272 params.flags = params.flags & params.valid_mask;
273
274 if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_NONE) {
275 n->enabled = false;
276 n->command_code = 0;
277 } else if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_81) {
278 n->enabled = true;
279 n->command_code = 0x81;
280 } else {
281 if (size < 11) {
282 err = -EINVAL;
283 goto out;
284 }
285 n->enabled = true;
286 n->command_code = params.command_code;
287 }
288
289 out:
290 DRM_DEBUG_DRIVER("Notification %s, command code = %#x\n",
291 (n->enabled ? "enabled" : "disabled"),
292 n->command_code);
293 kfree(info);
294 return err;
295 }
296
297 /**
298 * amdgpu_atif_get_sbios_requests - get requested sbios event
299 *
300 * @handle: acpi handle
301 * @req: atif sbios request struct
302 *
303 * Execute the ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS ATIF function
304 * to determine what requests the sbios is making to the driver
305 * (all asics).
306 * Returns 0 on success, error on failure.
307 */
amdgpu_atif_get_sbios_requests(acpi_handle handle,struct atif_sbios_requests * req)308 static int amdgpu_atif_get_sbios_requests(acpi_handle handle,
309 struct atif_sbios_requests *req)
310 {
311 union acpi_object *info;
312 size_t size;
313 int count = 0;
314
315 info = amdgpu_atif_call(handle, ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS, NULL);
316 if (!info)
317 return -EIO;
318
319 size = *(u16 *)info->buffer.pointer;
320 if (size < 0xd) {
321 count = -EINVAL;
322 goto out;
323 }
324 memset(req, 0, sizeof(*req));
325
326 size = min(sizeof(*req), size);
327 memcpy(req, info->buffer.pointer, size);
328 DRM_DEBUG_DRIVER("SBIOS pending requests: %#x\n", req->pending);
329
330 count = hweight32(req->pending);
331
332 out:
333 kfree(info);
334 return count;
335 }
336
337 /**
338 * amdgpu_atif_handler - handle ATIF notify requests
339 *
340 * @adev: amdgpu_device pointer
341 * @event: atif sbios request struct
342 *
343 * Checks the acpi event and if it matches an atif event,
344 * handles it.
345 * Returns NOTIFY code
346 */
amdgpu_atif_handler(struct amdgpu_device * adev,struct acpi_bus_event * event)347 int amdgpu_atif_handler(struct amdgpu_device *adev,
348 struct acpi_bus_event *event)
349 {
350 struct amdgpu_atif *atif = &adev->atif;
351 struct atif_sbios_requests req;
352 acpi_handle handle;
353 int count;
354
355 DRM_DEBUG_DRIVER("event, device_class = %s, type = %#x\n",
356 event->device_class, event->type);
357
358 if (strcmp(event->device_class, ACPI_VIDEO_CLASS) != 0)
359 return NOTIFY_DONE;
360
361 if (!atif->notification_cfg.enabled ||
362 event->type != atif->notification_cfg.command_code)
363 /* Not our event */
364 return NOTIFY_DONE;
365
366 /* Check pending SBIOS requests */
367 handle = ACPI_HANDLE(&adev->pdev->dev);
368 count = amdgpu_atif_get_sbios_requests(handle, &req);
369
370 if (count <= 0)
371 return NOTIFY_DONE;
372
373 DRM_DEBUG_DRIVER("ATIF: %d pending SBIOS requests\n", count);
374
375 if (req.pending & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST) {
376 struct amdgpu_encoder *enc = atif->encoder_for_bl;
377
378 if (enc) {
379 struct amdgpu_encoder_atom_dig *dig = enc->enc_priv;
380
381 DRM_DEBUG_DRIVER("Changing brightness to %d\n",
382 req.backlight_level);
383
384 amdgpu_display_backlight_set_level(adev, enc, req.backlight_level);
385
386 #if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
387 backlight_force_update(dig->bl_dev,
388 BACKLIGHT_UPDATE_HOTKEY);
389 #endif
390 }
391 }
392 /* TODO: check other events */
393
394 /* We've handled the event, stop the notifier chain. The ACPI interface
395 * overloads ACPI_VIDEO_NOTIFY_PROBE, we don't want to send that to
396 * userspace if the event was generated only to signal a SBIOS
397 * request.
398 */
399 return NOTIFY_BAD;
400 }
401
402 /* Call the ATCS method
403 */
404 /**
405 * amdgpu_atcs_call - call an ATCS method
406 *
407 * @handle: acpi handle
408 * @function: the ATCS function to execute
409 * @params: ATCS function params
410 *
411 * Executes the requested ATCS function (all asics).
412 * Returns a pointer to the acpi output buffer.
413 */
amdgpu_atcs_call(acpi_handle handle,int function,struct acpi_buffer * params)414 static union acpi_object *amdgpu_atcs_call(acpi_handle handle, int function,
415 struct acpi_buffer *params)
416 {
417 acpi_status status;
418 union acpi_object atcs_arg_elements[2];
419 struct acpi_object_list atcs_arg;
420 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
421
422 atcs_arg.count = 2;
423 atcs_arg.pointer = &atcs_arg_elements[0];
424
425 atcs_arg_elements[0].type = ACPI_TYPE_INTEGER;
426 atcs_arg_elements[0].integer.value = function;
427
428 if (params) {
429 atcs_arg_elements[1].type = ACPI_TYPE_BUFFER;
430 atcs_arg_elements[1].buffer.length = params->length;
431 atcs_arg_elements[1].buffer.pointer = params->pointer;
432 } else {
433 /* We need a second fake parameter */
434 atcs_arg_elements[1].type = ACPI_TYPE_INTEGER;
435 atcs_arg_elements[1].integer.value = 0;
436 }
437
438 status = acpi_evaluate_object(handle, "ATCS", &atcs_arg, &buffer);
439
440 /* Fail only if calling the method fails and ATIF is supported */
441 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
442 DRM_DEBUG_DRIVER("failed to evaluate ATCS got %s\n",
443 acpi_format_exception(status));
444 kfree(buffer.pointer);
445 return NULL;
446 }
447
448 return buffer.pointer;
449 }
450
451 /**
452 * amdgpu_atcs_parse_functions - parse supported functions
453 *
454 * @f: supported functions struct
455 * @mask: supported functions mask from ATCS
456 *
457 * Use the supported functions mask from ATCS function
458 * ATCS_FUNCTION_VERIFY_INTERFACE to determine what functions
459 * are supported (all asics).
460 */
amdgpu_atcs_parse_functions(struct amdgpu_atcs_functions * f,u32 mask)461 static void amdgpu_atcs_parse_functions(struct amdgpu_atcs_functions *f, u32 mask)
462 {
463 f->get_ext_state = mask & ATCS_GET_EXTERNAL_STATE_SUPPORTED;
464 f->pcie_perf_req = mask & ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED;
465 f->pcie_dev_rdy = mask & ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED;
466 f->pcie_bus_width = mask & ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED;
467 }
468
469 /**
470 * amdgpu_atcs_verify_interface - verify ATCS
471 *
472 * @handle: acpi handle
473 * @atcs: amdgpu atcs struct
474 *
475 * Execute the ATCS_FUNCTION_VERIFY_INTERFACE ATCS function
476 * to initialize ATCS and determine what features are supported
477 * (all asics).
478 * returns 0 on success, error on failure.
479 */
amdgpu_atcs_verify_interface(acpi_handle handle,struct amdgpu_atcs * atcs)480 static int amdgpu_atcs_verify_interface(acpi_handle handle,
481 struct amdgpu_atcs *atcs)
482 {
483 union acpi_object *info;
484 struct atcs_verify_interface output;
485 size_t size;
486 int err = 0;
487
488 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_VERIFY_INTERFACE, NULL);
489 if (!info)
490 return -EIO;
491
492 memset(&output, 0, sizeof(output));
493
494 size = *(u16 *) info->buffer.pointer;
495 if (size < 8) {
496 DRM_INFO("ATCS buffer is too small: %zu\n", size);
497 err = -EINVAL;
498 goto out;
499 }
500 size = min(sizeof(output), size);
501
502 memcpy(&output, info->buffer.pointer, size);
503
504 /* TODO: check version? */
505 DRM_DEBUG_DRIVER("ATCS version %u\n", output.version);
506
507 amdgpu_atcs_parse_functions(&atcs->functions, output.function_bits);
508
509 out:
510 kfree(info);
511 return err;
512 }
513
514 /**
515 * amdgpu_acpi_is_pcie_performance_request_supported
516 *
517 * @adev: amdgpu_device pointer
518 *
519 * Check if the ATCS pcie_perf_req and pcie_dev_rdy methods
520 * are supported (all asics).
521 * returns true if supported, false if not.
522 */
amdgpu_acpi_is_pcie_performance_request_supported(struct amdgpu_device * adev)523 bool amdgpu_acpi_is_pcie_performance_request_supported(struct amdgpu_device *adev)
524 {
525 struct amdgpu_atcs *atcs = &adev->atcs;
526
527 if (atcs->functions.pcie_perf_req && atcs->functions.pcie_dev_rdy)
528 return true;
529
530 return false;
531 }
532
533 /**
534 * amdgpu_acpi_pcie_notify_device_ready
535 *
536 * @adev: amdgpu_device pointer
537 *
538 * Executes the PCIE_DEVICE_READY_NOTIFICATION method
539 * (all asics).
540 * returns 0 on success, error on failure.
541 */
amdgpu_acpi_pcie_notify_device_ready(struct amdgpu_device * adev)542 int amdgpu_acpi_pcie_notify_device_ready(struct amdgpu_device *adev)
543 {
544 acpi_handle handle;
545 union acpi_object *info;
546 struct amdgpu_atcs *atcs = &adev->atcs;
547
548 /* Get the device handle */
549 handle = ACPI_HANDLE(&adev->pdev->dev);
550 if (!handle)
551 return -EINVAL;
552
553 if (!atcs->functions.pcie_dev_rdy)
554 return -EINVAL;
555
556 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION, NULL);
557 if (!info)
558 return -EIO;
559
560 kfree(info);
561
562 return 0;
563 }
564
565 /**
566 * amdgpu_acpi_pcie_performance_request
567 *
568 * @adev: amdgpu_device pointer
569 * @perf_req: requested perf level (pcie gen speed)
570 * @advertise: set advertise caps flag if set
571 *
572 * Executes the PCIE_PERFORMANCE_REQUEST method to
573 * change the pcie gen speed (all asics).
574 * returns 0 on success, error on failure.
575 */
amdgpu_acpi_pcie_performance_request(struct amdgpu_device * adev,u8 perf_req,bool advertise)576 int amdgpu_acpi_pcie_performance_request(struct amdgpu_device *adev,
577 u8 perf_req, bool advertise)
578 {
579 acpi_handle handle;
580 union acpi_object *info;
581 struct amdgpu_atcs *atcs = &adev->atcs;
582 struct atcs_pref_req_input atcs_input;
583 struct atcs_pref_req_output atcs_output;
584 struct acpi_buffer params;
585 size_t size;
586 u32 retry = 3;
587
588 if (amdgpu_acpi_pcie_notify_device_ready(adev))
589 return -EINVAL;
590
591 /* Get the device handle */
592 handle = ACPI_HANDLE(&adev->pdev->dev);
593 if (!handle)
594 return -EINVAL;
595
596 if (!atcs->functions.pcie_perf_req)
597 return -EINVAL;
598
599 atcs_input.size = sizeof(struct atcs_pref_req_input);
600 /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
601 atcs_input.client_id = adev->pdev->devfn | (adev->pdev->bus->number << 8);
602 atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
603 atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
604 if (advertise)
605 atcs_input.flags |= ATCS_ADVERTISE_CAPS;
606 atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
607 atcs_input.perf_req = perf_req;
608
609 params.length = sizeof(struct atcs_pref_req_input);
610 params.pointer = &atcs_input;
611
612 while (retry--) {
613 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST, ¶ms);
614 if (!info)
615 return -EIO;
616
617 memset(&atcs_output, 0, sizeof(atcs_output));
618
619 size = *(u16 *) info->buffer.pointer;
620 if (size < 3) {
621 DRM_INFO("ATCS buffer is too small: %zu\n", size);
622 kfree(info);
623 return -EINVAL;
624 }
625 size = min(sizeof(atcs_output), size);
626
627 memcpy(&atcs_output, info->buffer.pointer, size);
628
629 kfree(info);
630
631 switch (atcs_output.ret_val) {
632 case ATCS_REQUEST_REFUSED:
633 default:
634 return -EINVAL;
635 case ATCS_REQUEST_COMPLETE:
636 return 0;
637 case ATCS_REQUEST_IN_PROGRESS:
638 udelay(10);
639 break;
640 }
641 }
642
643 return 0;
644 }
645
646 /**
647 * amdgpu_acpi_event - handle notify events
648 *
649 * @nb: notifier block
650 * @val: val
651 * @data: acpi event
652 *
653 * Calls relevant amdgpu functions in response to various
654 * acpi events.
655 * Returns NOTIFY code
656 */
amdgpu_acpi_event(struct notifier_block * nb,unsigned long val,void * data)657 static int amdgpu_acpi_event(struct notifier_block *nb,
658 unsigned long val,
659 void *data)
660 {
661 struct amdgpu_device *adev = container_of(nb, struct amdgpu_device, acpi_nb);
662 struct acpi_bus_event *entry = (struct acpi_bus_event *)data;
663
664 if (strcmp(entry->device_class, ACPI_AC_CLASS) == 0) {
665 if (power_supply_is_system_supplied() > 0)
666 DRM_DEBUG_DRIVER("pm: AC\n");
667 else
668 DRM_DEBUG_DRIVER("pm: DC\n");
669
670 amdgpu_pm_acpi_event_handler(adev);
671 }
672
673 /* Check for pending SBIOS requests */
674 return amdgpu_atif_handler(adev, entry);
675 }
676
677 /* Call all ACPI methods here */
678 /**
679 * amdgpu_acpi_init - init driver acpi support
680 *
681 * @adev: amdgpu_device pointer
682 *
683 * Verifies the AMD ACPI interfaces and registers with the acpi
684 * notifier chain (all asics).
685 * Returns 0 on success, error on failure.
686 */
amdgpu_acpi_init(struct amdgpu_device * adev)687 int amdgpu_acpi_init(struct amdgpu_device *adev)
688 {
689 acpi_handle handle;
690 struct amdgpu_atif *atif = &adev->atif;
691 struct amdgpu_atcs *atcs = &adev->atcs;
692 int ret;
693
694 /* Get the device handle */
695 handle = ACPI_HANDLE(&adev->pdev->dev);
696
697 if (!adev->bios || !handle)
698 return 0;
699
700 /* Call the ATCS method */
701 ret = amdgpu_atcs_verify_interface(handle, atcs);
702 if (ret) {
703 DRM_DEBUG_DRIVER("Call to ATCS verify_interface failed: %d\n", ret);
704 }
705
706 /* Call the ATIF method */
707 ret = amdgpu_atif_verify_interface(handle, atif);
708 if (ret) {
709 DRM_DEBUG_DRIVER("Call to ATIF verify_interface failed: %d\n", ret);
710 goto out;
711 }
712
713 if (atif->notifications.brightness_change) {
714 struct drm_encoder *tmp;
715
716 /* Find the encoder controlling the brightness */
717 list_for_each_entry(tmp, &adev->ddev->mode_config.encoder_list,
718 head) {
719 struct amdgpu_encoder *enc = to_amdgpu_encoder(tmp);
720
721 if ((enc->devices & (ATOM_DEVICE_LCD_SUPPORT)) &&
722 enc->enc_priv) {
723 if (adev->is_atom_bios) {
724 struct amdgpu_encoder_atom_dig *dig = enc->enc_priv;
725 if (dig->bl_dev) {
726 atif->encoder_for_bl = enc;
727 break;
728 }
729 }
730 }
731 }
732 }
733
734 if (atif->functions.sbios_requests && !atif->functions.system_params) {
735 /* XXX check this workraround, if sbios request function is
736 * present we have to see how it's configured in the system
737 * params
738 */
739 atif->functions.system_params = true;
740 }
741
742 if (atif->functions.system_params) {
743 ret = amdgpu_atif_get_notification_params(handle,
744 &atif->notification_cfg);
745 if (ret) {
746 DRM_DEBUG_DRIVER("Call to GET_SYSTEM_PARAMS failed: %d\n",
747 ret);
748 /* Disable notification */
749 atif->notification_cfg.enabled = false;
750 }
751 }
752
753 out:
754 adev->acpi_nb.notifier_call = amdgpu_acpi_event;
755 register_acpi_notifier(&adev->acpi_nb);
756
757 return ret;
758 }
759
760 /**
761 * amdgpu_acpi_fini - tear down driver acpi support
762 *
763 * @adev: amdgpu_device pointer
764 *
765 * Unregisters with the acpi notifier chain (all asics).
766 */
amdgpu_acpi_fini(struct amdgpu_device * adev)767 void amdgpu_acpi_fini(struct amdgpu_device *adev)
768 {
769 unregister_acpi_notifier(&adev->acpi_nb);
770 }
771