Loading...
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
31#include <drm/drm_crtc_helper.h>
32#include "amdgpu.h"
33#include "amdgpu_pm.h"
34#include "amdgpu_display.h"
35#include "amd_acpi.h"
36#include "atom.h"
37
38struct amdgpu_atif_notification_cfg {
39 bool enabled;
40 int command_code;
41};
42
43struct amdgpu_atif_notifications {
44 bool thermal_state;
45 bool forced_power_state;
46 bool system_power_state;
47 bool brightness_change;
48 bool dgpu_display_event;
49 bool gpu_package_power_limit;
50};
51
52struct amdgpu_atif_functions {
53 bool system_params;
54 bool sbios_requests;
55 bool temperature_change;
56 bool query_backlight_transfer_characteristics;
57 bool ready_to_undock;
58 bool external_gpu_information;
59};
60
61struct amdgpu_atif {
62 acpi_handle handle;
63
64 struct amdgpu_atif_notifications notifications;
65 struct amdgpu_atif_functions functions;
66 struct amdgpu_atif_notification_cfg notification_cfg;
67 struct amdgpu_encoder *encoder_for_bl;
68 struct amdgpu_dm_backlight_caps backlight_caps;
69};
70
71/* Call the ATIF method
72 */
73/**
74 * amdgpu_atif_call - call an ATIF method
75 *
76 * @handle: acpi handle
77 * @function: the ATIF function to execute
78 * @params: ATIF function params
79 *
80 * Executes the requested ATIF function (all asics).
81 * Returns a pointer to the acpi output buffer.
82 */
83static union acpi_object *amdgpu_atif_call(struct amdgpu_atif *atif,
84 int function,
85 struct acpi_buffer *params)
86{
87 acpi_status status;
88 union acpi_object atif_arg_elements[2];
89 struct acpi_object_list atif_arg;
90 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
91
92 atif_arg.count = 2;
93 atif_arg.pointer = &atif_arg_elements[0];
94
95 atif_arg_elements[0].type = ACPI_TYPE_INTEGER;
96 atif_arg_elements[0].integer.value = function;
97
98 if (params) {
99 atif_arg_elements[1].type = ACPI_TYPE_BUFFER;
100 atif_arg_elements[1].buffer.length = params->length;
101 atif_arg_elements[1].buffer.pointer = params->pointer;
102 } else {
103 /* We need a second fake parameter */
104 atif_arg_elements[1].type = ACPI_TYPE_INTEGER;
105 atif_arg_elements[1].integer.value = 0;
106 }
107
108 status = acpi_evaluate_object(atif->handle, NULL, &atif_arg,
109 &buffer);
110
111 /* Fail only if calling the method fails and ATIF is supported */
112 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
113 DRM_DEBUG_DRIVER("failed to evaluate ATIF got %s\n",
114 acpi_format_exception(status));
115 kfree(buffer.pointer);
116 return NULL;
117 }
118
119 return buffer.pointer;
120}
121
122/**
123 * amdgpu_atif_parse_notification - parse supported notifications
124 *
125 * @n: supported notifications struct
126 * @mask: supported notifications mask from ATIF
127 *
128 * Use the supported notifications mask from ATIF function
129 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what notifications
130 * are supported (all asics).
131 */
132static void amdgpu_atif_parse_notification(struct amdgpu_atif_notifications *n, u32 mask)
133{
134 n->thermal_state = mask & ATIF_THERMAL_STATE_CHANGE_REQUEST_SUPPORTED;
135 n->forced_power_state = mask & ATIF_FORCED_POWER_STATE_CHANGE_REQUEST_SUPPORTED;
136 n->system_power_state = mask & ATIF_SYSTEM_POWER_SOURCE_CHANGE_REQUEST_SUPPORTED;
137 n->brightness_change = mask & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST_SUPPORTED;
138 n->dgpu_display_event = mask & ATIF_DGPU_DISPLAY_EVENT_SUPPORTED;
139 n->gpu_package_power_limit = mask & ATIF_GPU_PACKAGE_POWER_LIMIT_REQUEST_SUPPORTED;
140}
141
142/**
143 * amdgpu_atif_parse_functions - parse supported functions
144 *
145 * @f: supported functions struct
146 * @mask: supported functions mask from ATIF
147 *
148 * Use the supported functions mask from ATIF function
149 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what functions
150 * are supported (all asics).
151 */
152static void amdgpu_atif_parse_functions(struct amdgpu_atif_functions *f, u32 mask)
153{
154 f->system_params = mask & ATIF_GET_SYSTEM_PARAMETERS_SUPPORTED;
155 f->sbios_requests = mask & ATIF_GET_SYSTEM_BIOS_REQUESTS_SUPPORTED;
156 f->temperature_change = mask & ATIF_TEMPERATURE_CHANGE_NOTIFICATION_SUPPORTED;
157 f->query_backlight_transfer_characteristics =
158 mask & ATIF_QUERY_BACKLIGHT_TRANSFER_CHARACTERISTICS_SUPPORTED;
159 f->ready_to_undock = mask & ATIF_READY_TO_UNDOCK_NOTIFICATION_SUPPORTED;
160 f->external_gpu_information = mask & ATIF_GET_EXTERNAL_GPU_INFORMATION_SUPPORTED;
161}
162
163/**
164 * amdgpu_atif_verify_interface - verify ATIF
165 *
166 * @handle: acpi handle
167 * @atif: amdgpu atif struct
168 *
169 * Execute the ATIF_FUNCTION_VERIFY_INTERFACE ATIF function
170 * to initialize ATIF and determine what features are supported
171 * (all asics).
172 * returns 0 on success, error on failure.
173 */
174static int amdgpu_atif_verify_interface(struct amdgpu_atif *atif)
175{
176 union acpi_object *info;
177 struct atif_verify_interface output;
178 size_t size;
179 int err = 0;
180
181 info = amdgpu_atif_call(atif, ATIF_FUNCTION_VERIFY_INTERFACE, NULL);
182 if (!info)
183 return -EIO;
184
185 memset(&output, 0, sizeof(output));
186
187 size = *(u16 *) info->buffer.pointer;
188 if (size < 12) {
189 DRM_INFO("ATIF buffer is too small: %zu\n", size);
190 err = -EINVAL;
191 goto out;
192 }
193 size = min(sizeof(output), size);
194
195 memcpy(&output, info->buffer.pointer, size);
196
197 /* TODO: check version? */
198 DRM_DEBUG_DRIVER("ATIF version %u\n", output.version);
199
200 amdgpu_atif_parse_notification(&atif->notifications, output.notification_mask);
201 amdgpu_atif_parse_functions(&atif->functions, output.function_bits);
202
203out:
204 kfree(info);
205 return err;
206}
207
208static acpi_handle amdgpu_atif_probe_handle(acpi_handle dhandle)
209{
210 acpi_handle handle = NULL;
211 char acpi_method_name[255] = { 0 };
212 struct acpi_buffer buffer = { sizeof(acpi_method_name), acpi_method_name };
213 acpi_status status;
214
215 /* For PX/HG systems, ATIF and ATPX are in the iGPU's namespace, on dGPU only
216 * systems, ATIF is in the dGPU's namespace.
217 */
218 status = acpi_get_handle(dhandle, "ATIF", &handle);
219 if (ACPI_SUCCESS(status))
220 goto out;
221
222 if (amdgpu_has_atpx()) {
223 status = acpi_get_handle(amdgpu_atpx_get_dhandle(), "ATIF",
224 &handle);
225 if (ACPI_SUCCESS(status))
226 goto out;
227 }
228
229 DRM_DEBUG_DRIVER("No ATIF handle found\n");
230 return NULL;
231out:
232 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
233 DRM_DEBUG_DRIVER("Found ATIF handle %s\n", acpi_method_name);
234 return handle;
235}
236
237/**
238 * amdgpu_atif_get_notification_params - determine notify configuration
239 *
240 * @handle: acpi handle
241 * @n: atif notification configuration struct
242 *
243 * Execute the ATIF_FUNCTION_GET_SYSTEM_PARAMETERS ATIF function
244 * to determine if a notifier is used and if so which one
245 * (all asics). This is either Notify(VGA, 0x81) or Notify(VGA, n)
246 * where n is specified in the result if a notifier is used.
247 * Returns 0 on success, error on failure.
248 */
249static int amdgpu_atif_get_notification_params(struct amdgpu_atif *atif)
250{
251 union acpi_object *info;
252 struct amdgpu_atif_notification_cfg *n = &atif->notification_cfg;
253 struct atif_system_params params;
254 size_t size;
255 int err = 0;
256
257 info = amdgpu_atif_call(atif, ATIF_FUNCTION_GET_SYSTEM_PARAMETERS,
258 NULL);
259 if (!info) {
260 err = -EIO;
261 goto out;
262 }
263
264 size = *(u16 *) info->buffer.pointer;
265 if (size < 10) {
266 err = -EINVAL;
267 goto out;
268 }
269
270 memset(¶ms, 0, sizeof(params));
271 size = min(sizeof(params), size);
272 memcpy(¶ms, info->buffer.pointer, size);
273
274 DRM_DEBUG_DRIVER("SYSTEM_PARAMS: mask = %#x, flags = %#x\n",
275 params.flags, params.valid_mask);
276 params.flags = params.flags & params.valid_mask;
277
278 if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_NONE) {
279 n->enabled = false;
280 n->command_code = 0;
281 } else if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_81) {
282 n->enabled = true;
283 n->command_code = 0x81;
284 } else {
285 if (size < 11) {
286 err = -EINVAL;
287 goto out;
288 }
289 n->enabled = true;
290 n->command_code = params.command_code;
291 }
292
293out:
294 DRM_DEBUG_DRIVER("Notification %s, command code = %#x\n",
295 (n->enabled ? "enabled" : "disabled"),
296 n->command_code);
297 kfree(info);
298 return err;
299}
300
301/**
302 * amdgpu_atif_query_backlight_caps - get min and max backlight input signal
303 *
304 * @handle: acpi handle
305 *
306 * Execute the QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS ATIF function
307 * to determine the acceptable range of backlight values
308 *
309 * Backlight_caps.caps_valid will be set to true if the query is successful
310 *
311 * The input signals are in range 0-255
312 *
313 * This function assumes the display with backlight is the first LCD
314 *
315 * Returns 0 on success, error on failure.
316 */
317static int amdgpu_atif_query_backlight_caps(struct amdgpu_atif *atif)
318{
319 union acpi_object *info;
320 struct atif_qbtc_output characteristics;
321 struct atif_qbtc_arguments arguments;
322 struct acpi_buffer params;
323 size_t size;
324 int err = 0;
325
326 arguments.size = sizeof(arguments);
327 arguments.requested_display = ATIF_QBTC_REQUEST_LCD1;
328
329 params.length = sizeof(arguments);
330 params.pointer = (void *)&arguments;
331
332 info = amdgpu_atif_call(atif,
333 ATIF_FUNCTION_QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS,
334 ¶ms);
335 if (!info) {
336 err = -EIO;
337 goto out;
338 }
339
340 size = *(u16 *) info->buffer.pointer;
341 if (size < 10) {
342 err = -EINVAL;
343 goto out;
344 }
345
346 memset(&characteristics, 0, sizeof(characteristics));
347 size = min(sizeof(characteristics), size);
348 memcpy(&characteristics, info->buffer.pointer, size);
349
350 atif->backlight_caps.caps_valid = true;
351 atif->backlight_caps.min_input_signal =
352 characteristics.min_input_signal;
353 atif->backlight_caps.max_input_signal =
354 characteristics.max_input_signal;
355out:
356 kfree(info);
357 return err;
358}
359
360/**
361 * amdgpu_atif_get_sbios_requests - get requested sbios event
362 *
363 * @handle: acpi handle
364 * @req: atif sbios request struct
365 *
366 * Execute the ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS ATIF function
367 * to determine what requests the sbios is making to the driver
368 * (all asics).
369 * Returns 0 on success, error on failure.
370 */
371static int amdgpu_atif_get_sbios_requests(struct amdgpu_atif *atif,
372 struct atif_sbios_requests *req)
373{
374 union acpi_object *info;
375 size_t size;
376 int count = 0;
377
378 info = amdgpu_atif_call(atif, ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS,
379 NULL);
380 if (!info)
381 return -EIO;
382
383 size = *(u16 *)info->buffer.pointer;
384 if (size < 0xd) {
385 count = -EINVAL;
386 goto out;
387 }
388 memset(req, 0, sizeof(*req));
389
390 size = min(sizeof(*req), size);
391 memcpy(req, info->buffer.pointer, size);
392 DRM_DEBUG_DRIVER("SBIOS pending requests: %#x\n", req->pending);
393
394 count = hweight32(req->pending);
395
396out:
397 kfree(info);
398 return count;
399}
400
401/**
402 * amdgpu_atif_handler - handle ATIF notify requests
403 *
404 * @adev: amdgpu_device pointer
405 * @event: atif sbios request struct
406 *
407 * Checks the acpi event and if it matches an atif event,
408 * handles it.
409 *
410 * Returns:
411 * NOTIFY_BAD or NOTIFY_DONE, depending on the event.
412 */
413static int amdgpu_atif_handler(struct amdgpu_device *adev,
414 struct acpi_bus_event *event)
415{
416 struct amdgpu_atif *atif = adev->atif;
417 int count;
418
419 DRM_DEBUG_DRIVER("event, device_class = %s, type = %#x\n",
420 event->device_class, event->type);
421
422 if (strcmp(event->device_class, ACPI_VIDEO_CLASS) != 0)
423 return NOTIFY_DONE;
424
425 /* Is this actually our event? */
426 if (!atif ||
427 !atif->notification_cfg.enabled ||
428 event->type != atif->notification_cfg.command_code) {
429 /* These events will generate keypresses otherwise */
430 if (event->type == ACPI_VIDEO_NOTIFY_PROBE)
431 return NOTIFY_BAD;
432 else
433 return NOTIFY_DONE;
434 }
435
436 if (atif->functions.sbios_requests) {
437 struct atif_sbios_requests req;
438
439 /* Check pending SBIOS requests */
440 count = amdgpu_atif_get_sbios_requests(atif, &req);
441
442 if (count <= 0)
443 return NOTIFY_BAD;
444
445 DRM_DEBUG_DRIVER("ATIF: %d pending SBIOS requests\n", count);
446
447 /* todo: add DC handling */
448 if ((req.pending & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST) &&
449 !amdgpu_device_has_dc_support(adev)) {
450 struct amdgpu_encoder *enc = atif->encoder_for_bl;
451
452 if (enc) {
453 struct amdgpu_encoder_atom_dig *dig = enc->enc_priv;
454
455 DRM_DEBUG_DRIVER("Changing brightness to %d\n",
456 req.backlight_level);
457
458 amdgpu_display_backlight_set_level(adev, enc, req.backlight_level);
459
460#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
461 backlight_force_update(dig->bl_dev,
462 BACKLIGHT_UPDATE_HOTKEY);
463#endif
464 }
465 }
466 if (req.pending & ATIF_DGPU_DISPLAY_EVENT) {
467 if (adev->flags & AMD_IS_PX) {
468 pm_runtime_get_sync(adev->ddev->dev);
469 /* Just fire off a uevent and let userspace tell us what to do */
470 drm_helper_hpd_irq_event(adev->ddev);
471 pm_runtime_mark_last_busy(adev->ddev->dev);
472 pm_runtime_put_autosuspend(adev->ddev->dev);
473 }
474 }
475 /* TODO: check other events */
476 }
477
478 /* We've handled the event, stop the notifier chain. The ACPI interface
479 * overloads ACPI_VIDEO_NOTIFY_PROBE, we don't want to send that to
480 * userspace if the event was generated only to signal a SBIOS
481 * request.
482 */
483 return NOTIFY_BAD;
484}
485
486/* Call the ATCS method
487 */
488/**
489 * amdgpu_atcs_call - call an ATCS method
490 *
491 * @handle: acpi handle
492 * @function: the ATCS function to execute
493 * @params: ATCS function params
494 *
495 * Executes the requested ATCS function (all asics).
496 * Returns a pointer to the acpi output buffer.
497 */
498static union acpi_object *amdgpu_atcs_call(acpi_handle handle, int function,
499 struct acpi_buffer *params)
500{
501 acpi_status status;
502 union acpi_object atcs_arg_elements[2];
503 struct acpi_object_list atcs_arg;
504 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
505
506 atcs_arg.count = 2;
507 atcs_arg.pointer = &atcs_arg_elements[0];
508
509 atcs_arg_elements[0].type = ACPI_TYPE_INTEGER;
510 atcs_arg_elements[0].integer.value = function;
511
512 if (params) {
513 atcs_arg_elements[1].type = ACPI_TYPE_BUFFER;
514 atcs_arg_elements[1].buffer.length = params->length;
515 atcs_arg_elements[1].buffer.pointer = params->pointer;
516 } else {
517 /* We need a second fake parameter */
518 atcs_arg_elements[1].type = ACPI_TYPE_INTEGER;
519 atcs_arg_elements[1].integer.value = 0;
520 }
521
522 status = acpi_evaluate_object(handle, "ATCS", &atcs_arg, &buffer);
523
524 /* Fail only if calling the method fails and ATIF is supported */
525 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
526 DRM_DEBUG_DRIVER("failed to evaluate ATCS got %s\n",
527 acpi_format_exception(status));
528 kfree(buffer.pointer);
529 return NULL;
530 }
531
532 return buffer.pointer;
533}
534
535/**
536 * amdgpu_atcs_parse_functions - parse supported functions
537 *
538 * @f: supported functions struct
539 * @mask: supported functions mask from ATCS
540 *
541 * Use the supported functions mask from ATCS function
542 * ATCS_FUNCTION_VERIFY_INTERFACE to determine what functions
543 * are supported (all asics).
544 */
545static void amdgpu_atcs_parse_functions(struct amdgpu_atcs_functions *f, u32 mask)
546{
547 f->get_ext_state = mask & ATCS_GET_EXTERNAL_STATE_SUPPORTED;
548 f->pcie_perf_req = mask & ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED;
549 f->pcie_dev_rdy = mask & ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED;
550 f->pcie_bus_width = mask & ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED;
551}
552
553/**
554 * amdgpu_atcs_verify_interface - verify ATCS
555 *
556 * @handle: acpi handle
557 * @atcs: amdgpu atcs struct
558 *
559 * Execute the ATCS_FUNCTION_VERIFY_INTERFACE ATCS function
560 * to initialize ATCS and determine what features are supported
561 * (all asics).
562 * returns 0 on success, error on failure.
563 */
564static int amdgpu_atcs_verify_interface(acpi_handle handle,
565 struct amdgpu_atcs *atcs)
566{
567 union acpi_object *info;
568 struct atcs_verify_interface output;
569 size_t size;
570 int err = 0;
571
572 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_VERIFY_INTERFACE, NULL);
573 if (!info)
574 return -EIO;
575
576 memset(&output, 0, sizeof(output));
577
578 size = *(u16 *) info->buffer.pointer;
579 if (size < 8) {
580 DRM_INFO("ATCS buffer is too small: %zu\n", size);
581 err = -EINVAL;
582 goto out;
583 }
584 size = min(sizeof(output), size);
585
586 memcpy(&output, info->buffer.pointer, size);
587
588 /* TODO: check version? */
589 DRM_DEBUG_DRIVER("ATCS version %u\n", output.version);
590
591 amdgpu_atcs_parse_functions(&atcs->functions, output.function_bits);
592
593out:
594 kfree(info);
595 return err;
596}
597
598/**
599 * amdgpu_acpi_is_pcie_performance_request_supported
600 *
601 * @adev: amdgpu_device pointer
602 *
603 * Check if the ATCS pcie_perf_req and pcie_dev_rdy methods
604 * are supported (all asics).
605 * returns true if supported, false if not.
606 */
607bool amdgpu_acpi_is_pcie_performance_request_supported(struct amdgpu_device *adev)
608{
609 struct amdgpu_atcs *atcs = &adev->atcs;
610
611 if (atcs->functions.pcie_perf_req && atcs->functions.pcie_dev_rdy)
612 return true;
613
614 return false;
615}
616
617/**
618 * amdgpu_acpi_pcie_notify_device_ready
619 *
620 * @adev: amdgpu_device pointer
621 *
622 * Executes the PCIE_DEVICE_READY_NOTIFICATION method
623 * (all asics).
624 * returns 0 on success, error on failure.
625 */
626int amdgpu_acpi_pcie_notify_device_ready(struct amdgpu_device *adev)
627{
628 acpi_handle handle;
629 union acpi_object *info;
630 struct amdgpu_atcs *atcs = &adev->atcs;
631
632 /* Get the device handle */
633 handle = ACPI_HANDLE(&adev->pdev->dev);
634 if (!handle)
635 return -EINVAL;
636
637 if (!atcs->functions.pcie_dev_rdy)
638 return -EINVAL;
639
640 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION, NULL);
641 if (!info)
642 return -EIO;
643
644 kfree(info);
645
646 return 0;
647}
648
649/**
650 * amdgpu_acpi_pcie_performance_request
651 *
652 * @adev: amdgpu_device pointer
653 * @perf_req: requested perf level (pcie gen speed)
654 * @advertise: set advertise caps flag if set
655 *
656 * Executes the PCIE_PERFORMANCE_REQUEST method to
657 * change the pcie gen speed (all asics).
658 * returns 0 on success, error on failure.
659 */
660int amdgpu_acpi_pcie_performance_request(struct amdgpu_device *adev,
661 u8 perf_req, bool advertise)
662{
663 acpi_handle handle;
664 union acpi_object *info;
665 struct amdgpu_atcs *atcs = &adev->atcs;
666 struct atcs_pref_req_input atcs_input;
667 struct atcs_pref_req_output atcs_output;
668 struct acpi_buffer params;
669 size_t size;
670 u32 retry = 3;
671
672 if (amdgpu_acpi_pcie_notify_device_ready(adev))
673 return -EINVAL;
674
675 /* Get the device handle */
676 handle = ACPI_HANDLE(&adev->pdev->dev);
677 if (!handle)
678 return -EINVAL;
679
680 if (!atcs->functions.pcie_perf_req)
681 return -EINVAL;
682
683 atcs_input.size = sizeof(struct atcs_pref_req_input);
684 /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
685 atcs_input.client_id = adev->pdev->devfn | (adev->pdev->bus->number << 8);
686 atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
687 atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
688 if (advertise)
689 atcs_input.flags |= ATCS_ADVERTISE_CAPS;
690 atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
691 atcs_input.perf_req = perf_req;
692
693 params.length = sizeof(struct atcs_pref_req_input);
694 params.pointer = &atcs_input;
695
696 while (retry--) {
697 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST, ¶ms);
698 if (!info)
699 return -EIO;
700
701 memset(&atcs_output, 0, sizeof(atcs_output));
702
703 size = *(u16 *) info->buffer.pointer;
704 if (size < 3) {
705 DRM_INFO("ATCS buffer is too small: %zu\n", size);
706 kfree(info);
707 return -EINVAL;
708 }
709 size = min(sizeof(atcs_output), size);
710
711 memcpy(&atcs_output, info->buffer.pointer, size);
712
713 kfree(info);
714
715 switch (atcs_output.ret_val) {
716 case ATCS_REQUEST_REFUSED:
717 default:
718 return -EINVAL;
719 case ATCS_REQUEST_COMPLETE:
720 return 0;
721 case ATCS_REQUEST_IN_PROGRESS:
722 udelay(10);
723 break;
724 }
725 }
726
727 return 0;
728}
729
730/**
731 * amdgpu_acpi_event - handle notify events
732 *
733 * @nb: notifier block
734 * @val: val
735 * @data: acpi event
736 *
737 * Calls relevant amdgpu functions in response to various
738 * acpi events.
739 * Returns NOTIFY code
740 */
741static int amdgpu_acpi_event(struct notifier_block *nb,
742 unsigned long val,
743 void *data)
744{
745 struct amdgpu_device *adev = container_of(nb, struct amdgpu_device, acpi_nb);
746 struct acpi_bus_event *entry = (struct acpi_bus_event *)data;
747
748 if (strcmp(entry->device_class, ACPI_AC_CLASS) == 0) {
749 if (power_supply_is_system_supplied() > 0)
750 DRM_DEBUG_DRIVER("pm: AC\n");
751 else
752 DRM_DEBUG_DRIVER("pm: DC\n");
753
754 amdgpu_pm_acpi_event_handler(adev);
755 }
756
757 /* Check for pending SBIOS requests */
758 return amdgpu_atif_handler(adev, entry);
759}
760
761/* Call all ACPI methods here */
762/**
763 * amdgpu_acpi_init - init driver acpi support
764 *
765 * @adev: amdgpu_device pointer
766 *
767 * Verifies the AMD ACPI interfaces and registers with the acpi
768 * notifier chain (all asics).
769 * Returns 0 on success, error on failure.
770 */
771int amdgpu_acpi_init(struct amdgpu_device *adev)
772{
773 acpi_handle handle, atif_handle;
774 struct amdgpu_atif *atif;
775 struct amdgpu_atcs *atcs = &adev->atcs;
776 int ret;
777
778 /* Get the device handle */
779 handle = ACPI_HANDLE(&adev->pdev->dev);
780
781 if (!adev->bios || !handle)
782 return 0;
783
784 /* Call the ATCS method */
785 ret = amdgpu_atcs_verify_interface(handle, atcs);
786 if (ret) {
787 DRM_DEBUG_DRIVER("Call to ATCS verify_interface failed: %d\n", ret);
788 }
789
790 /* Probe for ATIF, and initialize it if found */
791 atif_handle = amdgpu_atif_probe_handle(handle);
792 if (!atif_handle)
793 goto out;
794
795 atif = kzalloc(sizeof(*atif), GFP_KERNEL);
796 if (!atif) {
797 DRM_WARN("Not enough memory to initialize ATIF\n");
798 goto out;
799 }
800 atif->handle = atif_handle;
801
802 /* Call the ATIF method */
803 ret = amdgpu_atif_verify_interface(atif);
804 if (ret) {
805 DRM_DEBUG_DRIVER("Call to ATIF verify_interface failed: %d\n", ret);
806 kfree(atif);
807 goto out;
808 }
809 adev->atif = atif;
810
811 if (atif->notifications.brightness_change) {
812 struct drm_encoder *tmp;
813
814 /* Find the encoder controlling the brightness */
815 list_for_each_entry(tmp, &adev->ddev->mode_config.encoder_list,
816 head) {
817 struct amdgpu_encoder *enc = to_amdgpu_encoder(tmp);
818
819 if ((enc->devices & (ATOM_DEVICE_LCD_SUPPORT)) &&
820 enc->enc_priv) {
821 struct amdgpu_encoder_atom_dig *dig = enc->enc_priv;
822 if (dig->bl_dev) {
823 atif->encoder_for_bl = enc;
824 break;
825 }
826 }
827 }
828 }
829
830 if (atif->functions.sbios_requests && !atif->functions.system_params) {
831 /* XXX check this workraround, if sbios request function is
832 * present we have to see how it's configured in the system
833 * params
834 */
835 atif->functions.system_params = true;
836 }
837
838 if (atif->functions.system_params) {
839 ret = amdgpu_atif_get_notification_params(atif);
840 if (ret) {
841 DRM_DEBUG_DRIVER("Call to GET_SYSTEM_PARAMS failed: %d\n",
842 ret);
843 /* Disable notification */
844 atif->notification_cfg.enabled = false;
845 }
846 }
847
848 if (atif->functions.query_backlight_transfer_characteristics) {
849 ret = amdgpu_atif_query_backlight_caps(atif);
850 if (ret) {
851 DRM_DEBUG_DRIVER("Call to QUERY_BACKLIGHT_TRANSFER_CHARACTERISTICS failed: %d\n",
852 ret);
853 atif->backlight_caps.caps_valid = false;
854 }
855 } else {
856 atif->backlight_caps.caps_valid = false;
857 }
858
859out:
860 adev->acpi_nb.notifier_call = amdgpu_acpi_event;
861 register_acpi_notifier(&adev->acpi_nb);
862
863 return ret;
864}
865
866void amdgpu_acpi_get_backlight_caps(struct amdgpu_device *adev,
867 struct amdgpu_dm_backlight_caps *caps)
868{
869 if (!adev->atif) {
870 caps->caps_valid = false;
871 return;
872 }
873 caps->caps_valid = adev->atif->backlight_caps.caps_valid;
874 caps->min_input_signal = adev->atif->backlight_caps.min_input_signal;
875 caps->max_input_signal = adev->atif->backlight_caps.max_input_signal;
876}
877
878/**
879 * amdgpu_acpi_fini - tear down driver acpi support
880 *
881 * @adev: amdgpu_device pointer
882 *
883 * Unregisters with the acpi notifier chain (all asics).
884 */
885void amdgpu_acpi_fini(struct amdgpu_device *adev)
886{
887 unregister_acpi_notifier(&adev->acpi_nb);
888 kfree(adev->atif);
889}
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 <linux/suspend.h>
30#include <acpi/video.h>
31#include <acpi/actbl.h>
32
33#include <drm/drm_crtc_helper.h>
34#include "amdgpu.h"
35#include "amdgpu_pm.h"
36#include "amdgpu_display.h"
37#include "amd_acpi.h"
38#include "atom.h"
39
40struct amdgpu_atif_notification_cfg {
41 bool enabled;
42 int command_code;
43};
44
45struct amdgpu_atif_notifications {
46 bool thermal_state;
47 bool forced_power_state;
48 bool system_power_state;
49 bool brightness_change;
50 bool dgpu_display_event;
51 bool gpu_package_power_limit;
52};
53
54struct amdgpu_atif_functions {
55 bool system_params;
56 bool sbios_requests;
57 bool temperature_change;
58 bool query_backlight_transfer_characteristics;
59 bool ready_to_undock;
60 bool external_gpu_information;
61};
62
63struct amdgpu_atif {
64 acpi_handle handle;
65
66 struct amdgpu_atif_notifications notifications;
67 struct amdgpu_atif_functions functions;
68 struct amdgpu_atif_notification_cfg notification_cfg;
69#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
70 struct backlight_device *bd;
71#endif
72 struct amdgpu_dm_backlight_caps backlight_caps;
73};
74
75struct amdgpu_atcs_functions {
76 bool get_ext_state;
77 bool pcie_perf_req;
78 bool pcie_dev_rdy;
79 bool pcie_bus_width;
80 bool power_shift_control;
81};
82
83struct amdgpu_atcs {
84 acpi_handle handle;
85
86 struct amdgpu_atcs_functions functions;
87};
88
89static struct amdgpu_acpi_priv {
90 struct amdgpu_atif atif;
91 struct amdgpu_atcs atcs;
92} amdgpu_acpi_priv;
93
94/* Call the ATIF method
95 */
96/**
97 * amdgpu_atif_call - call an ATIF method
98 *
99 * @atif: atif structure
100 * @function: the ATIF function to execute
101 * @params: ATIF function params
102 *
103 * Executes the requested ATIF function (all asics).
104 * Returns a pointer to the acpi output buffer.
105 */
106static union acpi_object *amdgpu_atif_call(struct amdgpu_atif *atif,
107 int function,
108 struct acpi_buffer *params)
109{
110 acpi_status status;
111 union acpi_object atif_arg_elements[2];
112 struct acpi_object_list atif_arg;
113 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
114
115 atif_arg.count = 2;
116 atif_arg.pointer = &atif_arg_elements[0];
117
118 atif_arg_elements[0].type = ACPI_TYPE_INTEGER;
119 atif_arg_elements[0].integer.value = function;
120
121 if (params) {
122 atif_arg_elements[1].type = ACPI_TYPE_BUFFER;
123 atif_arg_elements[1].buffer.length = params->length;
124 atif_arg_elements[1].buffer.pointer = params->pointer;
125 } else {
126 /* We need a second fake parameter */
127 atif_arg_elements[1].type = ACPI_TYPE_INTEGER;
128 atif_arg_elements[1].integer.value = 0;
129 }
130
131 status = acpi_evaluate_object(atif->handle, NULL, &atif_arg,
132 &buffer);
133
134 /* Fail only if calling the method fails and ATIF is supported */
135 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
136 DRM_DEBUG_DRIVER("failed to evaluate ATIF got %s\n",
137 acpi_format_exception(status));
138 kfree(buffer.pointer);
139 return NULL;
140 }
141
142 return buffer.pointer;
143}
144
145/**
146 * amdgpu_atif_parse_notification - parse supported notifications
147 *
148 * @n: supported notifications struct
149 * @mask: supported notifications mask from ATIF
150 *
151 * Use the supported notifications mask from ATIF function
152 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what notifications
153 * are supported (all asics).
154 */
155static void amdgpu_atif_parse_notification(struct amdgpu_atif_notifications *n, u32 mask)
156{
157 n->thermal_state = mask & ATIF_THERMAL_STATE_CHANGE_REQUEST_SUPPORTED;
158 n->forced_power_state = mask & ATIF_FORCED_POWER_STATE_CHANGE_REQUEST_SUPPORTED;
159 n->system_power_state = mask & ATIF_SYSTEM_POWER_SOURCE_CHANGE_REQUEST_SUPPORTED;
160 n->brightness_change = mask & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST_SUPPORTED;
161 n->dgpu_display_event = mask & ATIF_DGPU_DISPLAY_EVENT_SUPPORTED;
162 n->gpu_package_power_limit = mask & ATIF_GPU_PACKAGE_POWER_LIMIT_REQUEST_SUPPORTED;
163}
164
165/**
166 * amdgpu_atif_parse_functions - parse supported functions
167 *
168 * @f: supported functions struct
169 * @mask: supported functions mask from ATIF
170 *
171 * Use the supported functions mask from ATIF function
172 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what functions
173 * are supported (all asics).
174 */
175static void amdgpu_atif_parse_functions(struct amdgpu_atif_functions *f, u32 mask)
176{
177 f->system_params = mask & ATIF_GET_SYSTEM_PARAMETERS_SUPPORTED;
178 f->sbios_requests = mask & ATIF_GET_SYSTEM_BIOS_REQUESTS_SUPPORTED;
179 f->temperature_change = mask & ATIF_TEMPERATURE_CHANGE_NOTIFICATION_SUPPORTED;
180 f->query_backlight_transfer_characteristics =
181 mask & ATIF_QUERY_BACKLIGHT_TRANSFER_CHARACTERISTICS_SUPPORTED;
182 f->ready_to_undock = mask & ATIF_READY_TO_UNDOCK_NOTIFICATION_SUPPORTED;
183 f->external_gpu_information = mask & ATIF_GET_EXTERNAL_GPU_INFORMATION_SUPPORTED;
184}
185
186/**
187 * amdgpu_atif_verify_interface - verify ATIF
188 *
189 * @atif: amdgpu atif struct
190 *
191 * Execute the ATIF_FUNCTION_VERIFY_INTERFACE ATIF function
192 * to initialize ATIF and determine what features are supported
193 * (all asics).
194 * returns 0 on success, error on failure.
195 */
196static int amdgpu_atif_verify_interface(struct amdgpu_atif *atif)
197{
198 union acpi_object *info;
199 struct atif_verify_interface output;
200 size_t size;
201 int err = 0;
202
203 info = amdgpu_atif_call(atif, ATIF_FUNCTION_VERIFY_INTERFACE, NULL);
204 if (!info)
205 return -EIO;
206
207 memset(&output, 0, sizeof(output));
208
209 size = *(u16 *) info->buffer.pointer;
210 if (size < 12) {
211 DRM_INFO("ATIF buffer is too small: %zu\n", size);
212 err = -EINVAL;
213 goto out;
214 }
215 size = min(sizeof(output), size);
216
217 memcpy(&output, info->buffer.pointer, size);
218
219 /* TODO: check version? */
220 DRM_DEBUG_DRIVER("ATIF version %u\n", output.version);
221
222 amdgpu_atif_parse_notification(&atif->notifications, output.notification_mask);
223 amdgpu_atif_parse_functions(&atif->functions, output.function_bits);
224
225out:
226 kfree(info);
227 return err;
228}
229
230/**
231 * amdgpu_atif_get_notification_params - determine notify configuration
232 *
233 * @atif: acpi handle
234 *
235 * Execute the ATIF_FUNCTION_GET_SYSTEM_PARAMETERS ATIF function
236 * to determine if a notifier is used and if so which one
237 * (all asics). This is either Notify(VGA, 0x81) or Notify(VGA, n)
238 * where n is specified in the result if a notifier is used.
239 * Returns 0 on success, error on failure.
240 */
241static int amdgpu_atif_get_notification_params(struct amdgpu_atif *atif)
242{
243 union acpi_object *info;
244 struct amdgpu_atif_notification_cfg *n = &atif->notification_cfg;
245 struct atif_system_params params;
246 size_t size;
247 int err = 0;
248
249 info = amdgpu_atif_call(atif, ATIF_FUNCTION_GET_SYSTEM_PARAMETERS,
250 NULL);
251 if (!info) {
252 err = -EIO;
253 goto out;
254 }
255
256 size = *(u16 *) info->buffer.pointer;
257 if (size < 10) {
258 err = -EINVAL;
259 goto out;
260 }
261
262 memset(¶ms, 0, sizeof(params));
263 size = min(sizeof(params), size);
264 memcpy(¶ms, info->buffer.pointer, size);
265
266 DRM_DEBUG_DRIVER("SYSTEM_PARAMS: mask = %#x, flags = %#x\n",
267 params.flags, params.valid_mask);
268 params.flags = params.flags & params.valid_mask;
269
270 if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_NONE) {
271 n->enabled = false;
272 n->command_code = 0;
273 } else if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_81) {
274 n->enabled = true;
275 n->command_code = 0x81;
276 } else {
277 if (size < 11) {
278 err = -EINVAL;
279 goto out;
280 }
281 n->enabled = true;
282 n->command_code = params.command_code;
283 }
284
285out:
286 DRM_DEBUG_DRIVER("Notification %s, command code = %#x\n",
287 (n->enabled ? "enabled" : "disabled"),
288 n->command_code);
289 kfree(info);
290 return err;
291}
292
293/**
294 * amdgpu_atif_query_backlight_caps - get min and max backlight input signal
295 *
296 * @atif: acpi handle
297 *
298 * Execute the QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS ATIF function
299 * to determine the acceptable range of backlight values
300 *
301 * Backlight_caps.caps_valid will be set to true if the query is successful
302 *
303 * The input signals are in range 0-255
304 *
305 * This function assumes the display with backlight is the first LCD
306 *
307 * Returns 0 on success, error on failure.
308 */
309static int amdgpu_atif_query_backlight_caps(struct amdgpu_atif *atif)
310{
311 union acpi_object *info;
312 struct atif_qbtc_output characteristics;
313 struct atif_qbtc_arguments arguments;
314 struct acpi_buffer params;
315 size_t size;
316 int err = 0;
317
318 arguments.size = sizeof(arguments);
319 arguments.requested_display = ATIF_QBTC_REQUEST_LCD1;
320
321 params.length = sizeof(arguments);
322 params.pointer = (void *)&arguments;
323
324 info = amdgpu_atif_call(atif,
325 ATIF_FUNCTION_QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS,
326 ¶ms);
327 if (!info) {
328 err = -EIO;
329 goto out;
330 }
331
332 size = *(u16 *) info->buffer.pointer;
333 if (size < 10) {
334 err = -EINVAL;
335 goto out;
336 }
337
338 memset(&characteristics, 0, sizeof(characteristics));
339 size = min(sizeof(characteristics), size);
340 memcpy(&characteristics, info->buffer.pointer, size);
341
342 atif->backlight_caps.caps_valid = true;
343 atif->backlight_caps.min_input_signal =
344 characteristics.min_input_signal;
345 atif->backlight_caps.max_input_signal =
346 characteristics.max_input_signal;
347out:
348 kfree(info);
349 return err;
350}
351
352/**
353 * amdgpu_atif_get_sbios_requests - get requested sbios event
354 *
355 * @atif: acpi handle
356 * @req: atif sbios request struct
357 *
358 * Execute the ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS ATIF function
359 * to determine what requests the sbios is making to the driver
360 * (all asics).
361 * Returns 0 on success, error on failure.
362 */
363static int amdgpu_atif_get_sbios_requests(struct amdgpu_atif *atif,
364 struct atif_sbios_requests *req)
365{
366 union acpi_object *info;
367 size_t size;
368 int count = 0;
369
370 info = amdgpu_atif_call(atif, ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS,
371 NULL);
372 if (!info)
373 return -EIO;
374
375 size = *(u16 *)info->buffer.pointer;
376 if (size < 0xd) {
377 count = -EINVAL;
378 goto out;
379 }
380 memset(req, 0, sizeof(*req));
381
382 size = min(sizeof(*req), size);
383 memcpy(req, info->buffer.pointer, size);
384 DRM_DEBUG_DRIVER("SBIOS pending requests: %#x\n", req->pending);
385
386 count = hweight32(req->pending);
387
388out:
389 kfree(info);
390 return count;
391}
392
393/**
394 * amdgpu_atif_handler - handle ATIF notify requests
395 *
396 * @adev: amdgpu_device pointer
397 * @event: atif sbios request struct
398 *
399 * Checks the acpi event and if it matches an atif event,
400 * handles it.
401 *
402 * Returns:
403 * NOTIFY_BAD or NOTIFY_DONE, depending on the event.
404 */
405static int amdgpu_atif_handler(struct amdgpu_device *adev,
406 struct acpi_bus_event *event)
407{
408 struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
409 int count;
410
411 DRM_DEBUG_DRIVER("event, device_class = %s, type = %#x\n",
412 event->device_class, event->type);
413
414 if (strcmp(event->device_class, ACPI_VIDEO_CLASS) != 0)
415 return NOTIFY_DONE;
416
417 /* Is this actually our event? */
418 if (!atif->notification_cfg.enabled ||
419 event->type != atif->notification_cfg.command_code) {
420 /* These events will generate keypresses otherwise */
421 if (event->type == ACPI_VIDEO_NOTIFY_PROBE)
422 return NOTIFY_BAD;
423 else
424 return NOTIFY_DONE;
425 }
426
427 if (atif->functions.sbios_requests) {
428 struct atif_sbios_requests req;
429
430 /* Check pending SBIOS requests */
431 count = amdgpu_atif_get_sbios_requests(atif, &req);
432
433 if (count <= 0)
434 return NOTIFY_BAD;
435
436 DRM_DEBUG_DRIVER("ATIF: %d pending SBIOS requests\n", count);
437
438 if (req.pending & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST) {
439#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
440 if (atif->bd) {
441 DRM_DEBUG_DRIVER("Changing brightness to %d\n",
442 req.backlight_level);
443 /*
444 * XXX backlight_device_set_brightness() is
445 * hardwired to post BACKLIGHT_UPDATE_SYSFS.
446 * It probably should accept 'reason' parameter.
447 */
448 backlight_device_set_brightness(atif->bd, req.backlight_level);
449 }
450#endif
451 }
452
453 if (req.pending & ATIF_DGPU_DISPLAY_EVENT) {
454 if (adev->flags & AMD_IS_PX) {
455 pm_runtime_get_sync(adev_to_drm(adev)->dev);
456 /* Just fire off a uevent and let userspace tell us what to do */
457 drm_helper_hpd_irq_event(adev_to_drm(adev));
458 pm_runtime_mark_last_busy(adev_to_drm(adev)->dev);
459 pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
460 }
461 }
462 /* TODO: check other events */
463 }
464
465 /* We've handled the event, stop the notifier chain. The ACPI interface
466 * overloads ACPI_VIDEO_NOTIFY_PROBE, we don't want to send that to
467 * userspace if the event was generated only to signal a SBIOS
468 * request.
469 */
470 return NOTIFY_BAD;
471}
472
473/* Call the ATCS method
474 */
475/**
476 * amdgpu_atcs_call - call an ATCS method
477 *
478 * @atcs: atcs structure
479 * @function: the ATCS function to execute
480 * @params: ATCS function params
481 *
482 * Executes the requested ATCS function (all asics).
483 * Returns a pointer to the acpi output buffer.
484 */
485static union acpi_object *amdgpu_atcs_call(struct amdgpu_atcs *atcs,
486 int function,
487 struct acpi_buffer *params)
488{
489 acpi_status status;
490 union acpi_object atcs_arg_elements[2];
491 struct acpi_object_list atcs_arg;
492 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
493
494 atcs_arg.count = 2;
495 atcs_arg.pointer = &atcs_arg_elements[0];
496
497 atcs_arg_elements[0].type = ACPI_TYPE_INTEGER;
498 atcs_arg_elements[0].integer.value = function;
499
500 if (params) {
501 atcs_arg_elements[1].type = ACPI_TYPE_BUFFER;
502 atcs_arg_elements[1].buffer.length = params->length;
503 atcs_arg_elements[1].buffer.pointer = params->pointer;
504 } else {
505 /* We need a second fake parameter */
506 atcs_arg_elements[1].type = ACPI_TYPE_INTEGER;
507 atcs_arg_elements[1].integer.value = 0;
508 }
509
510 status = acpi_evaluate_object(atcs->handle, NULL, &atcs_arg, &buffer);
511
512 /* Fail only if calling the method fails and ATIF is supported */
513 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
514 DRM_DEBUG_DRIVER("failed to evaluate ATCS got %s\n",
515 acpi_format_exception(status));
516 kfree(buffer.pointer);
517 return NULL;
518 }
519
520 return buffer.pointer;
521}
522
523/**
524 * amdgpu_atcs_parse_functions - parse supported functions
525 *
526 * @f: supported functions struct
527 * @mask: supported functions mask from ATCS
528 *
529 * Use the supported functions mask from ATCS function
530 * ATCS_FUNCTION_VERIFY_INTERFACE to determine what functions
531 * are supported (all asics).
532 */
533static void amdgpu_atcs_parse_functions(struct amdgpu_atcs_functions *f, u32 mask)
534{
535 f->get_ext_state = mask & ATCS_GET_EXTERNAL_STATE_SUPPORTED;
536 f->pcie_perf_req = mask & ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED;
537 f->pcie_dev_rdy = mask & ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED;
538 f->pcie_bus_width = mask & ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED;
539 f->power_shift_control = mask & ATCS_SET_POWER_SHIFT_CONTROL_SUPPORTED;
540}
541
542/**
543 * amdgpu_atcs_verify_interface - verify ATCS
544 *
545 * @atcs: amdgpu atcs struct
546 *
547 * Execute the ATCS_FUNCTION_VERIFY_INTERFACE ATCS function
548 * to initialize ATCS and determine what features are supported
549 * (all asics).
550 * returns 0 on success, error on failure.
551 */
552static int amdgpu_atcs_verify_interface(struct amdgpu_atcs *atcs)
553{
554 union acpi_object *info;
555 struct atcs_verify_interface output;
556 size_t size;
557 int err = 0;
558
559 info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_VERIFY_INTERFACE, NULL);
560 if (!info)
561 return -EIO;
562
563 memset(&output, 0, sizeof(output));
564
565 size = *(u16 *) info->buffer.pointer;
566 if (size < 8) {
567 DRM_INFO("ATCS buffer is too small: %zu\n", size);
568 err = -EINVAL;
569 goto out;
570 }
571 size = min(sizeof(output), size);
572
573 memcpy(&output, info->buffer.pointer, size);
574
575 /* TODO: check version? */
576 DRM_DEBUG_DRIVER("ATCS version %u\n", output.version);
577
578 amdgpu_atcs_parse_functions(&atcs->functions, output.function_bits);
579
580out:
581 kfree(info);
582 return err;
583}
584
585/**
586 * amdgpu_acpi_is_pcie_performance_request_supported
587 *
588 * @adev: amdgpu_device pointer
589 *
590 * Check if the ATCS pcie_perf_req and pcie_dev_rdy methods
591 * are supported (all asics).
592 * returns true if supported, false if not.
593 */
594bool amdgpu_acpi_is_pcie_performance_request_supported(struct amdgpu_device *adev)
595{
596 struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
597
598 if (atcs->functions.pcie_perf_req && atcs->functions.pcie_dev_rdy)
599 return true;
600
601 return false;
602}
603
604/**
605 * amdgpu_acpi_is_power_shift_control_supported
606 *
607 * Check if the ATCS power shift control method
608 * is supported.
609 * returns true if supported, false if not.
610 */
611bool amdgpu_acpi_is_power_shift_control_supported(void)
612{
613 return amdgpu_acpi_priv.atcs.functions.power_shift_control;
614}
615
616/**
617 * amdgpu_acpi_pcie_notify_device_ready
618 *
619 * @adev: amdgpu_device pointer
620 *
621 * Executes the PCIE_DEVICE_READY_NOTIFICATION method
622 * (all asics).
623 * returns 0 on success, error on failure.
624 */
625int amdgpu_acpi_pcie_notify_device_ready(struct amdgpu_device *adev)
626{
627 union acpi_object *info;
628 struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
629
630 if (!atcs->functions.pcie_dev_rdy)
631 return -EINVAL;
632
633 info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION, NULL);
634 if (!info)
635 return -EIO;
636
637 kfree(info);
638
639 return 0;
640}
641
642/**
643 * amdgpu_acpi_pcie_performance_request
644 *
645 * @adev: amdgpu_device pointer
646 * @perf_req: requested perf level (pcie gen speed)
647 * @advertise: set advertise caps flag if set
648 *
649 * Executes the PCIE_PERFORMANCE_REQUEST method to
650 * change the pcie gen speed (all asics).
651 * returns 0 on success, error on failure.
652 */
653int amdgpu_acpi_pcie_performance_request(struct amdgpu_device *adev,
654 u8 perf_req, bool advertise)
655{
656 union acpi_object *info;
657 struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
658 struct atcs_pref_req_input atcs_input;
659 struct atcs_pref_req_output atcs_output;
660 struct acpi_buffer params;
661 size_t size;
662 u32 retry = 3;
663
664 if (amdgpu_acpi_pcie_notify_device_ready(adev))
665 return -EINVAL;
666
667 if (!atcs->functions.pcie_perf_req)
668 return -EINVAL;
669
670 atcs_input.size = sizeof(struct atcs_pref_req_input);
671 /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
672 atcs_input.client_id = adev->pdev->devfn | (adev->pdev->bus->number << 8);
673 atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
674 atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
675 if (advertise)
676 atcs_input.flags |= ATCS_ADVERTISE_CAPS;
677 atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
678 atcs_input.perf_req = perf_req;
679
680 params.length = sizeof(struct atcs_pref_req_input);
681 params.pointer = &atcs_input;
682
683 while (retry--) {
684 info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST, ¶ms);
685 if (!info)
686 return -EIO;
687
688 memset(&atcs_output, 0, sizeof(atcs_output));
689
690 size = *(u16 *) info->buffer.pointer;
691 if (size < 3) {
692 DRM_INFO("ATCS buffer is too small: %zu\n", size);
693 kfree(info);
694 return -EINVAL;
695 }
696 size = min(sizeof(atcs_output), size);
697
698 memcpy(&atcs_output, info->buffer.pointer, size);
699
700 kfree(info);
701
702 switch (atcs_output.ret_val) {
703 case ATCS_REQUEST_REFUSED:
704 default:
705 return -EINVAL;
706 case ATCS_REQUEST_COMPLETE:
707 return 0;
708 case ATCS_REQUEST_IN_PROGRESS:
709 udelay(10);
710 break;
711 }
712 }
713
714 return 0;
715}
716
717/**
718 * amdgpu_acpi_power_shift_control
719 *
720 * @adev: amdgpu_device pointer
721 * @dev_state: device acpi state
722 * @drv_state: driver state
723 *
724 * Executes the POWER_SHIFT_CONTROL method to
725 * communicate current dGPU device state and
726 * driver state to APU/SBIOS.
727 * returns 0 on success, error on failure.
728 */
729int amdgpu_acpi_power_shift_control(struct amdgpu_device *adev,
730 u8 dev_state, bool drv_state)
731{
732 union acpi_object *info;
733 struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
734 struct atcs_pwr_shift_input atcs_input;
735 struct acpi_buffer params;
736
737 if (!amdgpu_acpi_is_power_shift_control_supported())
738 return -EINVAL;
739
740 atcs_input.size = sizeof(struct atcs_pwr_shift_input);
741 /* dGPU id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
742 atcs_input.dgpu_id = adev->pdev->devfn | (adev->pdev->bus->number << 8);
743 atcs_input.dev_acpi_state = dev_state;
744 atcs_input.drv_state = drv_state;
745
746 params.length = sizeof(struct atcs_pwr_shift_input);
747 params.pointer = &atcs_input;
748
749 info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_POWER_SHIFT_CONTROL, ¶ms);
750 if (!info) {
751 DRM_ERROR("ATCS PSC update failed\n");
752 return -EIO;
753 }
754
755 return 0;
756}
757
758/**
759 * amdgpu_acpi_smart_shift_update - update dGPU device state to SBIOS
760 *
761 * @dev: drm_device pointer
762 * @ss_state: current smart shift event
763 *
764 * returns 0 on success,
765 * otherwise return error number.
766 */
767int amdgpu_acpi_smart_shift_update(struct drm_device *dev, enum amdgpu_ss ss_state)
768{
769 struct amdgpu_device *adev = drm_to_adev(dev);
770 int r;
771
772 if (!amdgpu_device_supports_smart_shift(dev))
773 return 0;
774
775 switch (ss_state) {
776 /* SBIOS trigger “stop”, “enable” and “start” at D0, Driver Operational.
777 * SBIOS trigger “stop” at D3, Driver Not Operational.
778 * SBIOS trigger “stop” and “disable” at D0, Driver NOT operational.
779 */
780 case AMDGPU_SS_DRV_LOAD:
781 r = amdgpu_acpi_power_shift_control(adev,
782 AMDGPU_ATCS_PSC_DEV_STATE_D0,
783 AMDGPU_ATCS_PSC_DRV_STATE_OPR);
784 break;
785 case AMDGPU_SS_DEV_D0:
786 r = amdgpu_acpi_power_shift_control(adev,
787 AMDGPU_ATCS_PSC_DEV_STATE_D0,
788 AMDGPU_ATCS_PSC_DRV_STATE_OPR);
789 break;
790 case AMDGPU_SS_DEV_D3:
791 r = amdgpu_acpi_power_shift_control(adev,
792 AMDGPU_ATCS_PSC_DEV_STATE_D3_HOT,
793 AMDGPU_ATCS_PSC_DRV_STATE_NOT_OPR);
794 break;
795 case AMDGPU_SS_DRV_UNLOAD:
796 r = amdgpu_acpi_power_shift_control(adev,
797 AMDGPU_ATCS_PSC_DEV_STATE_D0,
798 AMDGPU_ATCS_PSC_DRV_STATE_NOT_OPR);
799 break;
800 default:
801 return -EINVAL;
802 }
803
804 return r;
805}
806
807/**
808 * amdgpu_acpi_event - handle notify events
809 *
810 * @nb: notifier block
811 * @val: val
812 * @data: acpi event
813 *
814 * Calls relevant amdgpu functions in response to various
815 * acpi events.
816 * Returns NOTIFY code
817 */
818static int amdgpu_acpi_event(struct notifier_block *nb,
819 unsigned long val,
820 void *data)
821{
822 struct amdgpu_device *adev = container_of(nb, struct amdgpu_device, acpi_nb);
823 struct acpi_bus_event *entry = (struct acpi_bus_event *)data;
824
825 if (strcmp(entry->device_class, ACPI_AC_CLASS) == 0) {
826 if (power_supply_is_system_supplied() > 0)
827 DRM_DEBUG_DRIVER("pm: AC\n");
828 else
829 DRM_DEBUG_DRIVER("pm: DC\n");
830
831 amdgpu_pm_acpi_event_handler(adev);
832 }
833
834 /* Check for pending SBIOS requests */
835 return amdgpu_atif_handler(adev, entry);
836}
837
838/* Call all ACPI methods here */
839/**
840 * amdgpu_acpi_init - init driver acpi support
841 *
842 * @adev: amdgpu_device pointer
843 *
844 * Verifies the AMD ACPI interfaces and registers with the acpi
845 * notifier chain (all asics).
846 * Returns 0 on success, error on failure.
847 */
848int amdgpu_acpi_init(struct amdgpu_device *adev)
849{
850 struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
851
852#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
853 if (atif->notifications.brightness_change) {
854 if (amdgpu_device_has_dc_support(adev)) {
855#if defined(CONFIG_DRM_AMD_DC)
856 struct amdgpu_display_manager *dm = &adev->dm;
857 if (dm->backlight_dev)
858 atif->bd = dm->backlight_dev;
859#endif
860 } else {
861 struct drm_encoder *tmp;
862
863 /* Find the encoder controlling the brightness */
864 list_for_each_entry(tmp, &adev_to_drm(adev)->mode_config.encoder_list,
865 head) {
866 struct amdgpu_encoder *enc = to_amdgpu_encoder(tmp);
867
868 if ((enc->devices & (ATOM_DEVICE_LCD_SUPPORT)) &&
869 enc->enc_priv) {
870 struct amdgpu_encoder_atom_dig *dig = enc->enc_priv;
871 if (dig->bl_dev) {
872 atif->bd = dig->bl_dev;
873 break;
874 }
875 }
876 }
877 }
878 }
879#endif
880 adev->acpi_nb.notifier_call = amdgpu_acpi_event;
881 register_acpi_notifier(&adev->acpi_nb);
882
883 return 0;
884}
885
886void amdgpu_acpi_get_backlight_caps(struct amdgpu_dm_backlight_caps *caps)
887{
888 struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
889
890 caps->caps_valid = atif->backlight_caps.caps_valid;
891 caps->min_input_signal = atif->backlight_caps.min_input_signal;
892 caps->max_input_signal = atif->backlight_caps.max_input_signal;
893}
894
895/**
896 * amdgpu_acpi_fini - tear down driver acpi support
897 *
898 * @adev: amdgpu_device pointer
899 *
900 * Unregisters with the acpi notifier chain (all asics).
901 */
902void amdgpu_acpi_fini(struct amdgpu_device *adev)
903{
904 unregister_acpi_notifier(&adev->acpi_nb);
905}
906
907/**
908 * amdgpu_atif_pci_probe_handle - look up the ATIF handle
909 *
910 * @pdev: pci device
911 *
912 * Look up the ATIF handles (all asics).
913 * Returns true if the handle is found, false if not.
914 */
915static bool amdgpu_atif_pci_probe_handle(struct pci_dev *pdev)
916{
917 char acpi_method_name[255] = { 0 };
918 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
919 acpi_handle dhandle, atif_handle;
920 acpi_status status;
921 int ret;
922
923 dhandle = ACPI_HANDLE(&pdev->dev);
924 if (!dhandle)
925 return false;
926
927 status = acpi_get_handle(dhandle, "ATIF", &atif_handle);
928 if (ACPI_FAILURE(status)) {
929 return false;
930 }
931 amdgpu_acpi_priv.atif.handle = atif_handle;
932 acpi_get_name(amdgpu_acpi_priv.atif.handle, ACPI_FULL_PATHNAME, &buffer);
933 DRM_DEBUG_DRIVER("Found ATIF handle %s\n", acpi_method_name);
934 ret = amdgpu_atif_verify_interface(&amdgpu_acpi_priv.atif);
935 if (ret) {
936 amdgpu_acpi_priv.atif.handle = 0;
937 return false;
938 }
939 return true;
940}
941
942/**
943 * amdgpu_atcs_pci_probe_handle - look up the ATCS handle
944 *
945 * @pdev: pci device
946 *
947 * Look up the ATCS handles (all asics).
948 * Returns true if the handle is found, false if not.
949 */
950static bool amdgpu_atcs_pci_probe_handle(struct pci_dev *pdev)
951{
952 char acpi_method_name[255] = { 0 };
953 struct acpi_buffer buffer = { sizeof(acpi_method_name), acpi_method_name };
954 acpi_handle dhandle, atcs_handle;
955 acpi_status status;
956 int ret;
957
958 dhandle = ACPI_HANDLE(&pdev->dev);
959 if (!dhandle)
960 return false;
961
962 status = acpi_get_handle(dhandle, "ATCS", &atcs_handle);
963 if (ACPI_FAILURE(status)) {
964 return false;
965 }
966 amdgpu_acpi_priv.atcs.handle = atcs_handle;
967 acpi_get_name(amdgpu_acpi_priv.atcs.handle, ACPI_FULL_PATHNAME, &buffer);
968 DRM_DEBUG_DRIVER("Found ATCS handle %s\n", acpi_method_name);
969 ret = amdgpu_atcs_verify_interface(&amdgpu_acpi_priv.atcs);
970 if (ret) {
971 amdgpu_acpi_priv.atcs.handle = 0;
972 return false;
973 }
974 return true;
975}
976
977/*
978 * amdgpu_acpi_detect - detect ACPI ATIF/ATCS methods
979 *
980 * Check if we have the ATIF/ATCS methods and populate
981 * the structures in the driver.
982 */
983void amdgpu_acpi_detect(void)
984{
985 struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
986 struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
987 struct pci_dev *pdev = NULL;
988 int ret;
989
990 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
991 if (!atif->handle)
992 amdgpu_atif_pci_probe_handle(pdev);
993 if (!atcs->handle)
994 amdgpu_atcs_pci_probe_handle(pdev);
995 }
996
997 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
998 if (!atif->handle)
999 amdgpu_atif_pci_probe_handle(pdev);
1000 if (!atcs->handle)
1001 amdgpu_atcs_pci_probe_handle(pdev);
1002 }
1003
1004 if (atif->functions.sbios_requests && !atif->functions.system_params) {
1005 /* XXX check this workraround, if sbios request function is
1006 * present we have to see how it's configured in the system
1007 * params
1008 */
1009 atif->functions.system_params = true;
1010 }
1011
1012 if (atif->functions.system_params) {
1013 ret = amdgpu_atif_get_notification_params(atif);
1014 if (ret) {
1015 DRM_DEBUG_DRIVER("Call to GET_SYSTEM_PARAMS failed: %d\n",
1016 ret);
1017 /* Disable notification */
1018 atif->notification_cfg.enabled = false;
1019 }
1020 }
1021
1022 if (atif->functions.query_backlight_transfer_characteristics) {
1023 ret = amdgpu_atif_query_backlight_caps(atif);
1024 if (ret) {
1025 DRM_DEBUG_DRIVER("Call to QUERY_BACKLIGHT_TRANSFER_CHARACTERISTICS failed: %d\n",
1026 ret);
1027 atif->backlight_caps.caps_valid = false;
1028 }
1029 } else {
1030 atif->backlight_caps.caps_valid = false;
1031 }
1032}
1033
1034/**
1035 * amdgpu_acpi_is_s0ix_supported
1036 *
1037 * @adev: amdgpu_device_pointer
1038 *
1039 * returns true if supported, false if not.
1040 */
1041bool amdgpu_acpi_is_s0ix_supported(struct amdgpu_device *adev)
1042{
1043#if IS_ENABLED(CONFIG_AMD_PMC) && IS_ENABLED(CONFIG_SUSPEND)
1044 if (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0) {
1045 if (adev->flags & AMD_IS_APU)
1046 return pm_suspend_target_state == PM_SUSPEND_TO_IDLE;
1047 }
1048#endif
1049 return false;
1050}