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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 <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}
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 "amd_acpi.h"
34#include "atom.h"
35
36extern void amdgpu_pm_acpi_event_handler(struct amdgpu_device *adev);
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 */
292int 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 /* Get the device handle */
544 handle = ACPI_HANDLE(&adev->pdev->dev);
545 if (!handle)
546 return -EINVAL;
547
548 if (!atcs->functions.pcie_perf_req)
549 return -EINVAL;
550
551 atcs_input.size = sizeof(struct atcs_pref_req_input);
552 /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
553 atcs_input.client_id = adev->pdev->devfn | (adev->pdev->bus->number << 8);
554 atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
555 atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
556 if (advertise)
557 atcs_input.flags |= ATCS_ADVERTISE_CAPS;
558 atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
559 atcs_input.perf_req = perf_req;
560
561 params.length = sizeof(struct atcs_pref_req_input);
562 params.pointer = &atcs_input;
563
564 while (retry--) {
565 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST, ¶ms);
566 if (!info)
567 return -EIO;
568
569 memset(&atcs_output, 0, sizeof(atcs_output));
570
571 size = *(u16 *) info->buffer.pointer;
572 if (size < 3) {
573 DRM_INFO("ATCS buffer is too small: %zu\n", size);
574 kfree(info);
575 return -EINVAL;
576 }
577 size = min(sizeof(atcs_output), size);
578
579 memcpy(&atcs_output, info->buffer.pointer, size);
580
581 kfree(info);
582
583 switch (atcs_output.ret_val) {
584 case ATCS_REQUEST_REFUSED:
585 default:
586 return -EINVAL;
587 case ATCS_REQUEST_COMPLETE:
588 return 0;
589 case ATCS_REQUEST_IN_PROGRESS:
590 udelay(10);
591 break;
592 }
593 }
594
595 return 0;
596}
597
598/**
599 * amdgpu_acpi_event - handle notify events
600 *
601 * @nb: notifier block
602 * @val: val
603 * @data: acpi event
604 *
605 * Calls relevant amdgpu functions in response to various
606 * acpi events.
607 * Returns NOTIFY code
608 */
609static int amdgpu_acpi_event(struct notifier_block *nb,
610 unsigned long val,
611 void *data)
612{
613 struct amdgpu_device *adev = container_of(nb, struct amdgpu_device, acpi_nb);
614 struct acpi_bus_event *entry = (struct acpi_bus_event *)data;
615
616 if (strcmp(entry->device_class, ACPI_AC_CLASS) == 0) {
617 if (power_supply_is_system_supplied() > 0)
618 DRM_DEBUG_DRIVER("pm: AC\n");
619 else
620 DRM_DEBUG_DRIVER("pm: DC\n");
621
622 amdgpu_pm_acpi_event_handler(adev);
623 }
624
625 /* Check for pending SBIOS requests */
626 return amdgpu_atif_handler(adev, entry);
627}
628
629/* Call all ACPI methods here */
630/**
631 * amdgpu_acpi_init - init driver acpi support
632 *
633 * @adev: amdgpu_device pointer
634 *
635 * Verifies the AMD ACPI interfaces and registers with the acpi
636 * notifier chain (all asics).
637 * Returns 0 on success, error on failure.
638 */
639int amdgpu_acpi_init(struct amdgpu_device *adev)
640{
641 acpi_handle handle;
642 struct amdgpu_atif *atif = &adev->atif;
643 struct amdgpu_atcs *atcs = &adev->atcs;
644 int ret;
645
646 /* Get the device handle */
647 handle = ACPI_HANDLE(&adev->pdev->dev);
648
649 if (!adev->bios || !handle)
650 return 0;
651
652 /* Call the ATCS method */
653 ret = amdgpu_atcs_verify_interface(handle, atcs);
654 if (ret) {
655 DRM_DEBUG_DRIVER("Call to ATCS verify_interface failed: %d\n", ret);
656 }
657
658 /* Call the ATIF method */
659 ret = amdgpu_atif_verify_interface(handle, atif);
660 if (ret) {
661 DRM_DEBUG_DRIVER("Call to ATIF verify_interface failed: %d\n", ret);
662 goto out;
663 }
664
665 if (atif->notifications.brightness_change) {
666 struct drm_encoder *tmp;
667
668 /* Find the encoder controlling the brightness */
669 list_for_each_entry(tmp, &adev->ddev->mode_config.encoder_list,
670 head) {
671 struct amdgpu_encoder *enc = to_amdgpu_encoder(tmp);
672
673 if ((enc->devices & (ATOM_DEVICE_LCD_SUPPORT)) &&
674 enc->enc_priv) {
675 if (adev->is_atom_bios) {
676 struct amdgpu_encoder_atom_dig *dig = enc->enc_priv;
677 if (dig->bl_dev) {
678 atif->encoder_for_bl = enc;
679 break;
680 }
681 }
682 }
683 }
684 }
685
686 if (atif->functions.sbios_requests && !atif->functions.system_params) {
687 /* XXX check this workraround, if sbios request function is
688 * present we have to see how it's configured in the system
689 * params
690 */
691 atif->functions.system_params = true;
692 }
693
694 if (atif->functions.system_params) {
695 ret = amdgpu_atif_get_notification_params(handle,
696 &atif->notification_cfg);
697 if (ret) {
698 DRM_DEBUG_DRIVER("Call to GET_SYSTEM_PARAMS failed: %d\n",
699 ret);
700 /* Disable notification */
701 atif->notification_cfg.enabled = false;
702 }
703 }
704
705out:
706 adev->acpi_nb.notifier_call = amdgpu_acpi_event;
707 register_acpi_notifier(&adev->acpi_nb);
708
709 return ret;
710}
711
712/**
713 * amdgpu_acpi_fini - tear down driver acpi support
714 *
715 * @adev: amdgpu_device pointer
716 *
717 * Unregisters with the acpi notifier chain (all asics).
718 */
719void amdgpu_acpi_fini(struct amdgpu_device *adev)
720{
721 unregister_acpi_notifier(&adev->acpi_nb);
722}