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