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1// SPDX-License-Identifier: MIT
2/*
3 * Copyright 2012 Advanced Micro Devices, Inc.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
21 * OTHER DEALINGS IN THE SOFTWARE.
22 *
23 */
24
25#include <linux/pci.h>
26#include <linux/acpi.h>
27#include <linux/slab.h>
28#include <linux/power_supply.h>
29#include <linux/pm_runtime.h>
30#include <linux/suspend.h>
31#include <acpi/video.h>
32#include <acpi/actbl.h>
33
34#include <drm/drm_crtc_helper.h>
35#include "amdgpu.h"
36#include "amdgpu_pm.h"
37#include "amdgpu_display.h"
38#include "amd_acpi.h"
39#include "atom.h"
40
41struct amdgpu_atif_notification_cfg {
42 bool enabled;
43 int command_code;
44};
45
46struct amdgpu_atif_notifications {
47 bool thermal_state;
48 bool forced_power_state;
49 bool system_power_state;
50 bool brightness_change;
51 bool dgpu_display_event;
52 bool gpu_package_power_limit;
53};
54
55struct amdgpu_atif_functions {
56 bool system_params;
57 bool sbios_requests;
58 bool temperature_change;
59 bool query_backlight_transfer_characteristics;
60 bool ready_to_undock;
61 bool external_gpu_information;
62};
63
64struct amdgpu_atif {
65 acpi_handle handle;
66
67 struct amdgpu_atif_notifications notifications;
68 struct amdgpu_atif_functions functions;
69 struct amdgpu_atif_notification_cfg notification_cfg;
70 struct backlight_device *bd;
71 struct amdgpu_dm_backlight_caps backlight_caps;
72};
73
74struct amdgpu_atcs_functions {
75 bool get_ext_state;
76 bool pcie_perf_req;
77 bool pcie_dev_rdy;
78 bool pcie_bus_width;
79 bool power_shift_control;
80};
81
82struct amdgpu_atcs {
83 acpi_handle handle;
84
85 struct amdgpu_atcs_functions functions;
86};
87
88static struct amdgpu_acpi_priv {
89 struct amdgpu_atif atif;
90 struct amdgpu_atcs atcs;
91} amdgpu_acpi_priv;
92
93/* Call the ATIF method
94 */
95/**
96 * amdgpu_atif_call - call an ATIF method
97 *
98 * @atif: atif structure
99 * @function: the ATIF function to execute
100 * @params: ATIF function params
101 *
102 * Executes the requested ATIF function (all asics).
103 * Returns a pointer to the acpi output buffer.
104 */
105static union acpi_object *amdgpu_atif_call(struct amdgpu_atif *atif,
106 int function,
107 struct acpi_buffer *params)
108{
109 acpi_status status;
110 union acpi_object atif_arg_elements[2];
111 struct acpi_object_list atif_arg;
112 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
113
114 atif_arg.count = 2;
115 atif_arg.pointer = &atif_arg_elements[0];
116
117 atif_arg_elements[0].type = ACPI_TYPE_INTEGER;
118 atif_arg_elements[0].integer.value = function;
119
120 if (params) {
121 atif_arg_elements[1].type = ACPI_TYPE_BUFFER;
122 atif_arg_elements[1].buffer.length = params->length;
123 atif_arg_elements[1].buffer.pointer = params->pointer;
124 } else {
125 /* We need a second fake parameter */
126 atif_arg_elements[1].type = ACPI_TYPE_INTEGER;
127 atif_arg_elements[1].integer.value = 0;
128 }
129
130 status = acpi_evaluate_object(atif->handle, NULL, &atif_arg,
131 &buffer);
132
133 /* Fail only if calling the method fails and ATIF is supported */
134 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
135 DRM_DEBUG_DRIVER("failed to evaluate ATIF got %s\n",
136 acpi_format_exception(status));
137 kfree(buffer.pointer);
138 return NULL;
139 }
140
141 return buffer.pointer;
142}
143
144/**
145 * amdgpu_atif_parse_notification - parse supported notifications
146 *
147 * @n: supported notifications struct
148 * @mask: supported notifications mask from ATIF
149 *
150 * Use the supported notifications mask from ATIF function
151 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what notifications
152 * are supported (all asics).
153 */
154static void amdgpu_atif_parse_notification(struct amdgpu_atif_notifications *n, u32 mask)
155{
156 n->thermal_state = mask & ATIF_THERMAL_STATE_CHANGE_REQUEST_SUPPORTED;
157 n->forced_power_state = mask & ATIF_FORCED_POWER_STATE_CHANGE_REQUEST_SUPPORTED;
158 n->system_power_state = mask & ATIF_SYSTEM_POWER_SOURCE_CHANGE_REQUEST_SUPPORTED;
159 n->brightness_change = mask & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST_SUPPORTED;
160 n->dgpu_display_event = mask & ATIF_DGPU_DISPLAY_EVENT_SUPPORTED;
161 n->gpu_package_power_limit = mask & ATIF_GPU_PACKAGE_POWER_LIMIT_REQUEST_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 */
174static 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->temperature_change = mask & ATIF_TEMPERATURE_CHANGE_NOTIFICATION_SUPPORTED;
179 f->query_backlight_transfer_characteristics =
180 mask & ATIF_QUERY_BACKLIGHT_TRANSFER_CHARACTERISTICS_SUPPORTED;
181 f->ready_to_undock = mask & ATIF_READY_TO_UNDOCK_NOTIFICATION_SUPPORTED;
182 f->external_gpu_information = mask & ATIF_GET_EXTERNAL_GPU_INFORMATION_SUPPORTED;
183}
184
185/**
186 * amdgpu_atif_verify_interface - verify ATIF
187 *
188 * @atif: amdgpu atif struct
189 *
190 * Execute the ATIF_FUNCTION_VERIFY_INTERFACE ATIF function
191 * to initialize ATIF and determine what features are supported
192 * (all asics).
193 * returns 0 on success, error on failure.
194 */
195static int amdgpu_atif_verify_interface(struct amdgpu_atif *atif)
196{
197 union acpi_object *info;
198 struct atif_verify_interface output;
199 size_t size;
200 int err = 0;
201
202 info = amdgpu_atif_call(atif, ATIF_FUNCTION_VERIFY_INTERFACE, NULL);
203 if (!info)
204 return -EIO;
205
206 memset(&output, 0, sizeof(output));
207
208 size = *(u16 *) info->buffer.pointer;
209 if (size < 12) {
210 DRM_INFO("ATIF buffer is too small: %zu\n", size);
211 err = -EINVAL;
212 goto out;
213 }
214 size = min(sizeof(output), size);
215
216 memcpy(&output, info->buffer.pointer, size);
217
218 /* TODO: check version? */
219 DRM_DEBUG_DRIVER("ATIF version %u\n", output.version);
220
221 amdgpu_atif_parse_notification(&atif->notifications, output.notification_mask);
222 amdgpu_atif_parse_functions(&atif->functions, output.function_bits);
223
224out:
225 kfree(info);
226 return err;
227}
228
229/**
230 * amdgpu_atif_get_notification_params - determine notify configuration
231 *
232 * @atif: acpi handle
233 *
234 * Execute the ATIF_FUNCTION_GET_SYSTEM_PARAMETERS ATIF function
235 * to determine if a notifier is used and if so which one
236 * (all asics). This is either Notify(VGA, 0x81) or Notify(VGA, n)
237 * where n is specified in the result if a notifier is used.
238 * Returns 0 on success, error on failure.
239 */
240static int amdgpu_atif_get_notification_params(struct amdgpu_atif *atif)
241{
242 union acpi_object *info;
243 struct amdgpu_atif_notification_cfg *n = &atif->notification_cfg;
244 struct atif_system_params params;
245 size_t size;
246 int err = 0;
247
248 info = amdgpu_atif_call(atif, ATIF_FUNCTION_GET_SYSTEM_PARAMETERS,
249 NULL);
250 if (!info) {
251 err = -EIO;
252 goto out;
253 }
254
255 size = *(u16 *) info->buffer.pointer;
256 if (size < 10) {
257 err = -EINVAL;
258 goto out;
259 }
260
261 memset(¶ms, 0, sizeof(params));
262 size = min(sizeof(params), size);
263 memcpy(¶ms, info->buffer.pointer, size);
264
265 DRM_DEBUG_DRIVER("SYSTEM_PARAMS: mask = %#x, flags = %#x\n",
266 params.flags, params.valid_mask);
267 params.flags = params.flags & params.valid_mask;
268
269 if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_NONE) {
270 n->enabled = false;
271 n->command_code = 0;
272 } else if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_81) {
273 n->enabled = true;
274 n->command_code = 0x81;
275 } else {
276 if (size < 11) {
277 err = -EINVAL;
278 goto out;
279 }
280 n->enabled = true;
281 n->command_code = params.command_code;
282 }
283
284out:
285 DRM_DEBUG_DRIVER("Notification %s, command code = %#x\n",
286 (n->enabled ? "enabled" : "disabled"),
287 n->command_code);
288 kfree(info);
289 return err;
290}
291
292/**
293 * amdgpu_atif_query_backlight_caps - get min and max backlight input signal
294 *
295 * @atif: acpi handle
296 *
297 * Execute the QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS ATIF function
298 * to determine the acceptable range of backlight values
299 *
300 * Backlight_caps.caps_valid will be set to true if the query is successful
301 *
302 * The input signals are in range 0-255
303 *
304 * This function assumes the display with backlight is the first LCD
305 *
306 * Returns 0 on success, error on failure.
307 */
308static int amdgpu_atif_query_backlight_caps(struct amdgpu_atif *atif)
309{
310 union acpi_object *info;
311 struct atif_qbtc_output characteristics;
312 struct atif_qbtc_arguments arguments;
313 struct acpi_buffer params;
314 size_t size;
315 int err = 0;
316
317 arguments.size = sizeof(arguments);
318 arguments.requested_display = ATIF_QBTC_REQUEST_LCD1;
319
320 params.length = sizeof(arguments);
321 params.pointer = (void *)&arguments;
322
323 info = amdgpu_atif_call(atif,
324 ATIF_FUNCTION_QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS,
325 ¶ms);
326 if (!info) {
327 err = -EIO;
328 goto out;
329 }
330
331 size = *(u16 *) info->buffer.pointer;
332 if (size < 10) {
333 err = -EINVAL;
334 goto out;
335 }
336
337 memset(&characteristics, 0, sizeof(characteristics));
338 size = min(sizeof(characteristics), size);
339 memcpy(&characteristics, info->buffer.pointer, size);
340
341 atif->backlight_caps.caps_valid = true;
342 atif->backlight_caps.min_input_signal =
343 characteristics.min_input_signal;
344 atif->backlight_caps.max_input_signal =
345 characteristics.max_input_signal;
346out:
347 kfree(info);
348 return err;
349}
350
351/**
352 * amdgpu_atif_get_sbios_requests - get requested sbios event
353 *
354 * @atif: acpi handle
355 * @req: atif sbios request struct
356 *
357 * Execute the ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS ATIF function
358 * to determine what requests the sbios is making to the driver
359 * (all asics).
360 * Returns 0 on success, error on failure.
361 */
362static int amdgpu_atif_get_sbios_requests(struct amdgpu_atif *atif,
363 struct atif_sbios_requests *req)
364{
365 union acpi_object *info;
366 size_t size;
367 int count = 0;
368
369 info = amdgpu_atif_call(atif, ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS,
370 NULL);
371 if (!info)
372 return -EIO;
373
374 size = *(u16 *)info->buffer.pointer;
375 if (size < 0xd) {
376 count = -EINVAL;
377 goto out;
378 }
379 memset(req, 0, sizeof(*req));
380
381 size = min(sizeof(*req), size);
382 memcpy(req, info->buffer.pointer, size);
383 DRM_DEBUG_DRIVER("SBIOS pending requests: %#x\n", req->pending);
384
385 count = hweight32(req->pending);
386
387out:
388 kfree(info);
389 return count;
390}
391
392/**
393 * amdgpu_atif_handler - handle ATIF notify requests
394 *
395 * @adev: amdgpu_device pointer
396 * @event: atif sbios request struct
397 *
398 * Checks the acpi event and if it matches an atif event,
399 * handles it.
400 *
401 * Returns:
402 * NOTIFY_BAD or NOTIFY_DONE, depending on the event.
403 */
404static int amdgpu_atif_handler(struct amdgpu_device *adev,
405 struct acpi_bus_event *event)
406{
407 struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
408 int count;
409
410 DRM_DEBUG_DRIVER("event, device_class = %s, type = %#x\n",
411 event->device_class, event->type);
412
413 if (strcmp(event->device_class, ACPI_VIDEO_CLASS) != 0)
414 return NOTIFY_DONE;
415
416 /* Is this actually our event? */
417 if (!atif->notification_cfg.enabled ||
418 event->type != atif->notification_cfg.command_code) {
419 /* These events will generate keypresses otherwise */
420 if (event->type == ACPI_VIDEO_NOTIFY_PROBE)
421 return NOTIFY_BAD;
422 else
423 return NOTIFY_DONE;
424 }
425
426 if (atif->functions.sbios_requests) {
427 struct atif_sbios_requests req;
428
429 /* Check pending SBIOS requests */
430 count = amdgpu_atif_get_sbios_requests(atif, &req);
431
432 if (count <= 0)
433 return NOTIFY_BAD;
434
435 DRM_DEBUG_DRIVER("ATIF: %d pending SBIOS requests\n", count);
436
437 if (req.pending & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST) {
438 if (atif->bd) {
439 DRM_DEBUG_DRIVER("Changing brightness to %d\n",
440 req.backlight_level);
441 /*
442 * XXX backlight_device_set_brightness() is
443 * hardwired to post BACKLIGHT_UPDATE_SYSFS.
444 * It probably should accept 'reason' parameter.
445 */
446 backlight_device_set_brightness(atif->bd, req.backlight_level);
447 }
448 }
449
450 if (req.pending & ATIF_DGPU_DISPLAY_EVENT) {
451 if (adev->flags & AMD_IS_PX) {
452 pm_runtime_get_sync(adev_to_drm(adev)->dev);
453 /* Just fire off a uevent and let userspace tell us what to do */
454 drm_helper_hpd_irq_event(adev_to_drm(adev));
455 pm_runtime_mark_last_busy(adev_to_drm(adev)->dev);
456 pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
457 }
458 }
459 /* TODO: check other events */
460 }
461
462 /* We've handled the event, stop the notifier chain. The ACPI interface
463 * overloads ACPI_VIDEO_NOTIFY_PROBE, we don't want to send that to
464 * userspace if the event was generated only to signal a SBIOS
465 * request.
466 */
467 return NOTIFY_BAD;
468}
469
470/* Call the ATCS method
471 */
472/**
473 * amdgpu_atcs_call - call an ATCS method
474 *
475 * @atcs: atcs structure
476 * @function: the ATCS function to execute
477 * @params: ATCS function params
478 *
479 * Executes the requested ATCS function (all asics).
480 * Returns a pointer to the acpi output buffer.
481 */
482static union acpi_object *amdgpu_atcs_call(struct amdgpu_atcs *atcs,
483 int function,
484 struct acpi_buffer *params)
485{
486 acpi_status status;
487 union acpi_object atcs_arg_elements[2];
488 struct acpi_object_list atcs_arg;
489 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
490
491 atcs_arg.count = 2;
492 atcs_arg.pointer = &atcs_arg_elements[0];
493
494 atcs_arg_elements[0].type = ACPI_TYPE_INTEGER;
495 atcs_arg_elements[0].integer.value = function;
496
497 if (params) {
498 atcs_arg_elements[1].type = ACPI_TYPE_BUFFER;
499 atcs_arg_elements[1].buffer.length = params->length;
500 atcs_arg_elements[1].buffer.pointer = params->pointer;
501 } else {
502 /* We need a second fake parameter */
503 atcs_arg_elements[1].type = ACPI_TYPE_INTEGER;
504 atcs_arg_elements[1].integer.value = 0;
505 }
506
507 status = acpi_evaluate_object(atcs->handle, NULL, &atcs_arg, &buffer);
508
509 /* Fail only if calling the method fails and ATIF is supported */
510 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
511 DRM_DEBUG_DRIVER("failed to evaluate ATCS got %s\n",
512 acpi_format_exception(status));
513 kfree(buffer.pointer);
514 return NULL;
515 }
516
517 return buffer.pointer;
518}
519
520/**
521 * amdgpu_atcs_parse_functions - parse supported functions
522 *
523 * @f: supported functions struct
524 * @mask: supported functions mask from ATCS
525 *
526 * Use the supported functions mask from ATCS function
527 * ATCS_FUNCTION_VERIFY_INTERFACE to determine what functions
528 * are supported (all asics).
529 */
530static void amdgpu_atcs_parse_functions(struct amdgpu_atcs_functions *f, u32 mask)
531{
532 f->get_ext_state = mask & ATCS_GET_EXTERNAL_STATE_SUPPORTED;
533 f->pcie_perf_req = mask & ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED;
534 f->pcie_dev_rdy = mask & ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED;
535 f->pcie_bus_width = mask & ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED;
536 f->power_shift_control = mask & ATCS_SET_POWER_SHIFT_CONTROL_SUPPORTED;
537}
538
539/**
540 * amdgpu_atcs_verify_interface - verify ATCS
541 *
542 * @atcs: amdgpu atcs struct
543 *
544 * Execute the ATCS_FUNCTION_VERIFY_INTERFACE ATCS function
545 * to initialize ATCS and determine what features are supported
546 * (all asics).
547 * returns 0 on success, error on failure.
548 */
549static int amdgpu_atcs_verify_interface(struct amdgpu_atcs *atcs)
550{
551 union acpi_object *info;
552 struct atcs_verify_interface output;
553 size_t size;
554 int err = 0;
555
556 info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_VERIFY_INTERFACE, NULL);
557 if (!info)
558 return -EIO;
559
560 memset(&output, 0, sizeof(output));
561
562 size = *(u16 *) info->buffer.pointer;
563 if (size < 8) {
564 DRM_INFO("ATCS buffer is too small: %zu\n", size);
565 err = -EINVAL;
566 goto out;
567 }
568 size = min(sizeof(output), size);
569
570 memcpy(&output, info->buffer.pointer, size);
571
572 /* TODO: check version? */
573 DRM_DEBUG_DRIVER("ATCS version %u\n", output.version);
574
575 amdgpu_atcs_parse_functions(&atcs->functions, output.function_bits);
576
577out:
578 kfree(info);
579 return err;
580}
581
582/**
583 * amdgpu_acpi_is_pcie_performance_request_supported
584 *
585 * @adev: amdgpu_device pointer
586 *
587 * Check if the ATCS pcie_perf_req and pcie_dev_rdy methods
588 * are supported (all asics).
589 * returns true if supported, false if not.
590 */
591bool amdgpu_acpi_is_pcie_performance_request_supported(struct amdgpu_device *adev)
592{
593 struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
594
595 if (atcs->functions.pcie_perf_req && atcs->functions.pcie_dev_rdy)
596 return true;
597
598 return false;
599}
600
601/**
602 * amdgpu_acpi_is_power_shift_control_supported
603 *
604 * Check if the ATCS power shift control method
605 * is supported.
606 * returns true if supported, false if not.
607 */
608bool amdgpu_acpi_is_power_shift_control_supported(void)
609{
610 return amdgpu_acpi_priv.atcs.functions.power_shift_control;
611}
612
613/**
614 * amdgpu_acpi_pcie_notify_device_ready
615 *
616 * @adev: amdgpu_device pointer
617 *
618 * Executes the PCIE_DEVICE_READY_NOTIFICATION method
619 * (all asics).
620 * returns 0 on success, error on failure.
621 */
622int amdgpu_acpi_pcie_notify_device_ready(struct amdgpu_device *adev)
623{
624 union acpi_object *info;
625 struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
626
627 if (!atcs->functions.pcie_dev_rdy)
628 return -EINVAL;
629
630 info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION, NULL);
631 if (!info)
632 return -EIO;
633
634 kfree(info);
635
636 return 0;
637}
638
639/**
640 * amdgpu_acpi_pcie_performance_request
641 *
642 * @adev: amdgpu_device pointer
643 * @perf_req: requested perf level (pcie gen speed)
644 * @advertise: set advertise caps flag if set
645 *
646 * Executes the PCIE_PERFORMANCE_REQUEST method to
647 * change the pcie gen speed (all asics).
648 * returns 0 on success, error on failure.
649 */
650int amdgpu_acpi_pcie_performance_request(struct amdgpu_device *adev,
651 u8 perf_req, bool advertise)
652{
653 union acpi_object *info;
654 struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
655 struct atcs_pref_req_input atcs_input;
656 struct atcs_pref_req_output atcs_output;
657 struct acpi_buffer params;
658 size_t size;
659 u32 retry = 3;
660
661 if (amdgpu_acpi_pcie_notify_device_ready(adev))
662 return -EINVAL;
663
664 if (!atcs->functions.pcie_perf_req)
665 return -EINVAL;
666
667 atcs_input.size = sizeof(struct atcs_pref_req_input);
668 /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
669 atcs_input.client_id = adev->pdev->devfn | (adev->pdev->bus->number << 8);
670 atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
671 atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
672 if (advertise)
673 atcs_input.flags |= ATCS_ADVERTISE_CAPS;
674 atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
675 atcs_input.perf_req = perf_req;
676
677 params.length = sizeof(struct atcs_pref_req_input);
678 params.pointer = &atcs_input;
679
680 while (retry--) {
681 info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST, ¶ms);
682 if (!info)
683 return -EIO;
684
685 memset(&atcs_output, 0, sizeof(atcs_output));
686
687 size = *(u16 *) info->buffer.pointer;
688 if (size < 3) {
689 DRM_INFO("ATCS buffer is too small: %zu\n", size);
690 kfree(info);
691 return -EINVAL;
692 }
693 size = min(sizeof(atcs_output), size);
694
695 memcpy(&atcs_output, info->buffer.pointer, size);
696
697 kfree(info);
698
699 switch (atcs_output.ret_val) {
700 case ATCS_REQUEST_REFUSED:
701 default:
702 return -EINVAL;
703 case ATCS_REQUEST_COMPLETE:
704 return 0;
705 case ATCS_REQUEST_IN_PROGRESS:
706 udelay(10);
707 break;
708 }
709 }
710
711 return 0;
712}
713
714/**
715 * amdgpu_acpi_power_shift_control
716 *
717 * @adev: amdgpu_device pointer
718 * @dev_state: device acpi state
719 * @drv_state: driver state
720 *
721 * Executes the POWER_SHIFT_CONTROL method to
722 * communicate current dGPU device state and
723 * driver state to APU/SBIOS.
724 * returns 0 on success, error on failure.
725 */
726int amdgpu_acpi_power_shift_control(struct amdgpu_device *adev,
727 u8 dev_state, bool drv_state)
728{
729 union acpi_object *info;
730 struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
731 struct atcs_pwr_shift_input atcs_input;
732 struct acpi_buffer params;
733
734 if (!amdgpu_acpi_is_power_shift_control_supported())
735 return -EINVAL;
736
737 atcs_input.size = sizeof(struct atcs_pwr_shift_input);
738 /* dGPU id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
739 atcs_input.dgpu_id = adev->pdev->devfn | (adev->pdev->bus->number << 8);
740 atcs_input.dev_acpi_state = dev_state;
741 atcs_input.drv_state = drv_state;
742
743 params.length = sizeof(struct atcs_pwr_shift_input);
744 params.pointer = &atcs_input;
745
746 info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_POWER_SHIFT_CONTROL, ¶ms);
747 if (!info) {
748 DRM_ERROR("ATCS PSC update failed\n");
749 return -EIO;
750 }
751
752 return 0;
753}
754
755/**
756 * amdgpu_acpi_smart_shift_update - update dGPU device state to SBIOS
757 *
758 * @dev: drm_device pointer
759 * @ss_state: current smart shift event
760 *
761 * returns 0 on success,
762 * otherwise return error number.
763 */
764int amdgpu_acpi_smart_shift_update(struct drm_device *dev, enum amdgpu_ss ss_state)
765{
766 struct amdgpu_device *adev = drm_to_adev(dev);
767 int r;
768
769 if (!amdgpu_device_supports_smart_shift(dev))
770 return 0;
771
772 switch (ss_state) {
773 /* SBIOS trigger “stop”, “enable” and “start” at D0, Driver Operational.
774 * SBIOS trigger “stop” at D3, Driver Not Operational.
775 * SBIOS trigger “stop” and “disable” at D0, Driver NOT operational.
776 */
777 case AMDGPU_SS_DRV_LOAD:
778 r = amdgpu_acpi_power_shift_control(adev,
779 AMDGPU_ATCS_PSC_DEV_STATE_D0,
780 AMDGPU_ATCS_PSC_DRV_STATE_OPR);
781 break;
782 case AMDGPU_SS_DEV_D0:
783 r = amdgpu_acpi_power_shift_control(adev,
784 AMDGPU_ATCS_PSC_DEV_STATE_D0,
785 AMDGPU_ATCS_PSC_DRV_STATE_OPR);
786 break;
787 case AMDGPU_SS_DEV_D3:
788 r = amdgpu_acpi_power_shift_control(adev,
789 AMDGPU_ATCS_PSC_DEV_STATE_D3_HOT,
790 AMDGPU_ATCS_PSC_DRV_STATE_NOT_OPR);
791 break;
792 case AMDGPU_SS_DRV_UNLOAD:
793 r = amdgpu_acpi_power_shift_control(adev,
794 AMDGPU_ATCS_PSC_DEV_STATE_D0,
795 AMDGPU_ATCS_PSC_DRV_STATE_NOT_OPR);
796 break;
797 default:
798 return -EINVAL;
799 }
800
801 return r;
802}
803
804/**
805 * amdgpu_acpi_event - handle notify events
806 *
807 * @nb: notifier block
808 * @val: val
809 * @data: acpi event
810 *
811 * Calls relevant amdgpu functions in response to various
812 * acpi events.
813 * Returns NOTIFY code
814 */
815static int amdgpu_acpi_event(struct notifier_block *nb,
816 unsigned long val,
817 void *data)
818{
819 struct amdgpu_device *adev = container_of(nb, struct amdgpu_device, acpi_nb);
820 struct acpi_bus_event *entry = (struct acpi_bus_event *)data;
821
822 if (strcmp(entry->device_class, ACPI_AC_CLASS) == 0) {
823 if (power_supply_is_system_supplied() > 0)
824 DRM_DEBUG_DRIVER("pm: AC\n");
825 else
826 DRM_DEBUG_DRIVER("pm: DC\n");
827
828 amdgpu_pm_acpi_event_handler(adev);
829 }
830
831 /* Check for pending SBIOS requests */
832 return amdgpu_atif_handler(adev, entry);
833}
834
835/* Call all ACPI methods here */
836/**
837 * amdgpu_acpi_init - init driver acpi support
838 *
839 * @adev: amdgpu_device pointer
840 *
841 * Verifies the AMD ACPI interfaces and registers with the acpi
842 * notifier chain (all asics).
843 * Returns 0 on success, error on failure.
844 */
845int amdgpu_acpi_init(struct amdgpu_device *adev)
846{
847 struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
848
849 if (atif->notifications.brightness_change) {
850 if (adev->dc_enabled) {
851#if defined(CONFIG_DRM_AMD_DC)
852 struct amdgpu_display_manager *dm = &adev->dm;
853
854 if (dm->backlight_dev[0])
855 atif->bd = dm->backlight_dev[0];
856#endif
857 } else {
858 struct drm_encoder *tmp;
859
860 /* Find the encoder controlling the brightness */
861 list_for_each_entry(tmp, &adev_to_drm(adev)->mode_config.encoder_list,
862 head) {
863 struct amdgpu_encoder *enc = to_amdgpu_encoder(tmp);
864
865 if ((enc->devices & (ATOM_DEVICE_LCD_SUPPORT)) &&
866 enc->enc_priv) {
867 struct amdgpu_encoder_atom_dig *dig = enc->enc_priv;
868
869 if (dig->bl_dev) {
870 atif->bd = dig->bl_dev;
871 break;
872 }
873 }
874 }
875 }
876 }
877 adev->acpi_nb.notifier_call = amdgpu_acpi_event;
878 register_acpi_notifier(&adev->acpi_nb);
879
880 return 0;
881}
882
883void amdgpu_acpi_get_backlight_caps(struct amdgpu_dm_backlight_caps *caps)
884{
885 struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
886
887 caps->caps_valid = atif->backlight_caps.caps_valid;
888 caps->min_input_signal = atif->backlight_caps.min_input_signal;
889 caps->max_input_signal = atif->backlight_caps.max_input_signal;
890}
891
892/**
893 * amdgpu_acpi_fini - tear down driver acpi support
894 *
895 * @adev: amdgpu_device pointer
896 *
897 * Unregisters with the acpi notifier chain (all asics).
898 */
899void amdgpu_acpi_fini(struct amdgpu_device *adev)
900{
901 unregister_acpi_notifier(&adev->acpi_nb);
902}
903
904/**
905 * amdgpu_atif_pci_probe_handle - look up the ATIF handle
906 *
907 * @pdev: pci device
908 *
909 * Look up the ATIF handles (all asics).
910 * Returns true if the handle is found, false if not.
911 */
912static bool amdgpu_atif_pci_probe_handle(struct pci_dev *pdev)
913{
914 char acpi_method_name[255] = { 0 };
915 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
916 acpi_handle dhandle, atif_handle;
917 acpi_status status;
918 int ret;
919
920 dhandle = ACPI_HANDLE(&pdev->dev);
921 if (!dhandle)
922 return false;
923
924 status = acpi_get_handle(dhandle, "ATIF", &atif_handle);
925 if (ACPI_FAILURE(status))
926 return false;
927
928 amdgpu_acpi_priv.atif.handle = atif_handle;
929 acpi_get_name(amdgpu_acpi_priv.atif.handle, ACPI_FULL_PATHNAME, &buffer);
930 DRM_DEBUG_DRIVER("Found ATIF handle %s\n", acpi_method_name);
931 ret = amdgpu_atif_verify_interface(&amdgpu_acpi_priv.atif);
932 if (ret) {
933 amdgpu_acpi_priv.atif.handle = 0;
934 return false;
935 }
936 return true;
937}
938
939/**
940 * amdgpu_atcs_pci_probe_handle - look up the ATCS handle
941 *
942 * @pdev: pci device
943 *
944 * Look up the ATCS handles (all asics).
945 * Returns true if the handle is found, false if not.
946 */
947static bool amdgpu_atcs_pci_probe_handle(struct pci_dev *pdev)
948{
949 char acpi_method_name[255] = { 0 };
950 struct acpi_buffer buffer = { sizeof(acpi_method_name), acpi_method_name };
951 acpi_handle dhandle, atcs_handle;
952 acpi_status status;
953 int ret;
954
955 dhandle = ACPI_HANDLE(&pdev->dev);
956 if (!dhandle)
957 return false;
958
959 status = acpi_get_handle(dhandle, "ATCS", &atcs_handle);
960 if (ACPI_FAILURE(status))
961 return false;
962
963 amdgpu_acpi_priv.atcs.handle = atcs_handle;
964 acpi_get_name(amdgpu_acpi_priv.atcs.handle, ACPI_FULL_PATHNAME, &buffer);
965 DRM_DEBUG_DRIVER("Found ATCS handle %s\n", acpi_method_name);
966 ret = amdgpu_atcs_verify_interface(&amdgpu_acpi_priv.atcs);
967 if (ret) {
968 amdgpu_acpi_priv.atcs.handle = 0;
969 return false;
970 }
971 return true;
972}
973
974/*
975 * amdgpu_acpi_detect - detect ACPI ATIF/ATCS methods
976 *
977 * Check if we have the ATIF/ATCS methods and populate
978 * the structures in the driver.
979 */
980void amdgpu_acpi_detect(void)
981{
982 struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
983 struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
984 struct pci_dev *pdev = NULL;
985 int ret;
986
987 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
988 if (!atif->handle)
989 amdgpu_atif_pci_probe_handle(pdev);
990 if (!atcs->handle)
991 amdgpu_atcs_pci_probe_handle(pdev);
992 }
993
994 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
995 if (!atif->handle)
996 amdgpu_atif_pci_probe_handle(pdev);
997 if (!atcs->handle)
998 amdgpu_atcs_pci_probe_handle(pdev);
999 }
1000
1001 if (atif->functions.sbios_requests && !atif->functions.system_params) {
1002 /* XXX check this workraround, if sbios request function is
1003 * present we have to see how it's configured in the system
1004 * params
1005 */
1006 atif->functions.system_params = true;
1007 }
1008
1009 if (atif->functions.system_params) {
1010 ret = amdgpu_atif_get_notification_params(atif);
1011 if (ret) {
1012 DRM_DEBUG_DRIVER("Call to GET_SYSTEM_PARAMS failed: %d\n",
1013 ret);
1014 /* Disable notification */
1015 atif->notification_cfg.enabled = false;
1016 }
1017 }
1018
1019 if (atif->functions.query_backlight_transfer_characteristics) {
1020 ret = amdgpu_atif_query_backlight_caps(atif);
1021 if (ret) {
1022 DRM_DEBUG_DRIVER("Call to QUERY_BACKLIGHT_TRANSFER_CHARACTERISTICS failed: %d\n",
1023 ret);
1024 atif->backlight_caps.caps_valid = false;
1025 }
1026 } else {
1027 atif->backlight_caps.caps_valid = false;
1028 }
1029}
1030
1031#if IS_ENABLED(CONFIG_SUSPEND)
1032/**
1033 * amdgpu_acpi_is_s3_active
1034 *
1035 * @adev: amdgpu_device_pointer
1036 *
1037 * returns true if supported, false if not.
1038 */
1039bool amdgpu_acpi_is_s3_active(struct amdgpu_device *adev)
1040{
1041 return !(adev->flags & AMD_IS_APU) ||
1042 (pm_suspend_target_state == PM_SUSPEND_MEM);
1043}
1044
1045/**
1046 * amdgpu_acpi_should_gpu_reset
1047 *
1048 * @adev: amdgpu_device_pointer
1049 *
1050 * returns true if should reset GPU, false if not
1051 */
1052bool amdgpu_acpi_should_gpu_reset(struct amdgpu_device *adev)
1053{
1054 if (adev->flags & AMD_IS_APU)
1055 return false;
1056
1057 if (amdgpu_sriov_vf(adev))
1058 return false;
1059
1060 return pm_suspend_target_state != PM_SUSPEND_TO_IDLE;
1061}
1062
1063/**
1064 * amdgpu_acpi_is_s0ix_active
1065 *
1066 * @adev: amdgpu_device_pointer
1067 *
1068 * returns true if supported, false if not.
1069 */
1070bool amdgpu_acpi_is_s0ix_active(struct amdgpu_device *adev)
1071{
1072 if (!(adev->flags & AMD_IS_APU) ||
1073 (pm_suspend_target_state != PM_SUSPEND_TO_IDLE))
1074 return false;
1075
1076 /*
1077 * If ACPI_FADT_LOW_POWER_S0 is not set in the FADT, it is generally
1078 * risky to do any special firmware-related preparations for entering
1079 * S0ix even though the system is suspending to idle, so return false
1080 * in that case.
1081 */
1082 if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0)) {
1083 dev_warn_once(adev->dev,
1084 "Power consumption will be higher as BIOS has not been configured for suspend-to-idle.\n"
1085 "To use suspend-to-idle change the sleep mode in BIOS setup.\n");
1086 return false;
1087 }
1088
1089#if !IS_ENABLED(CONFIG_AMD_PMC)
1090 dev_warn_once(adev->dev,
1091 "Power consumption will be higher as the kernel has not been compiled with CONFIG_AMD_PMC.\n");
1092 return false;
1093#else
1094 return true;
1095#endif /* CONFIG_AMD_PMC */
1096}
1097
1098#endif /* CONFIG_SUSPEND */
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}