1/*
2 * Copyright 2012 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 */
23
24#include <linux/pci.h>
25#include <linux/acpi.h>
26#include <linux/slab.h>
27#include <linux/power_supply.h>
28#include <linux/pm_runtime.h>
29#include <acpi/video.h>
30#include <drm/drmP.h>
31#include <drm/drm_crtc_helper.h>
32#include "amdgpu.h"
33#include "amdgpu_pm.h"
34#include "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(&params, 0, sizeof(params));
271 size = min(sizeof(params), size);
272 memcpy(&params, 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 &params);
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 amdgpu_atpx_dgpu_req_power_for_displays()) {
469 pm_runtime_get_sync(adev->ddev->dev);
470 /* Just fire off a uevent and let userspace tell us what to do */
471 drm_helper_hpd_irq_event(adev->ddev);
472 pm_runtime_mark_last_busy(adev->ddev->dev);
473 pm_runtime_put_autosuspend(adev->ddev->dev);
474 }
475 }
476 /* TODO: check other events */
477 }
478
479 /* We've handled the event, stop the notifier chain. The ACPI interface
480 * overloads ACPI_VIDEO_NOTIFY_PROBE, we don't want to send that to
481 * userspace if the event was generated only to signal a SBIOS
482 * request.
483 */
484 return NOTIFY_BAD;
485}
486
487/* Call the ATCS method
488 */
489/**
490 * amdgpu_atcs_call - call an ATCS method
491 *
492 * @handle: acpi handle
493 * @function: the ATCS function to execute
494 * @params: ATCS function params
495 *
496 * Executes the requested ATCS function (all asics).
497 * Returns a pointer to the acpi output buffer.
498 */
499static union acpi_object *amdgpu_atcs_call(acpi_handle handle, int function,
500 struct acpi_buffer *params)
501{
502 acpi_status status;
503 union acpi_object atcs_arg_elements[2];
504 struct acpi_object_list atcs_arg;
505 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
506
507 atcs_arg.count = 2;
508 atcs_arg.pointer = &atcs_arg_elements[0];
509
510 atcs_arg_elements[0].type = ACPI_TYPE_INTEGER;
511 atcs_arg_elements[0].integer.value = function;
512
513 if (params) {
514 atcs_arg_elements[1].type = ACPI_TYPE_BUFFER;
515 atcs_arg_elements[1].buffer.length = params->length;
516 atcs_arg_elements[1].buffer.pointer = params->pointer;
517 } else {
518 /* We need a second fake parameter */
519 atcs_arg_elements[1].type = ACPI_TYPE_INTEGER;
520 atcs_arg_elements[1].integer.value = 0;
521 }
522
523 status = acpi_evaluate_object(handle, "ATCS", &atcs_arg, &buffer);
524
525 /* Fail only if calling the method fails and ATIF is supported */
526 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
527 DRM_DEBUG_DRIVER("failed to evaluate ATCS got %s\n",
528 acpi_format_exception(status));
529 kfree(buffer.pointer);
530 return NULL;
531 }
532
533 return buffer.pointer;
534}
535
536/**
537 * amdgpu_atcs_parse_functions - parse supported functions
538 *
539 * @f: supported functions struct
540 * @mask: supported functions mask from ATCS
541 *
542 * Use the supported functions mask from ATCS function
543 * ATCS_FUNCTION_VERIFY_INTERFACE to determine what functions
544 * are supported (all asics).
545 */
546static void amdgpu_atcs_parse_functions(struct amdgpu_atcs_functions *f, u32 mask)
547{
548 f->get_ext_state = mask & ATCS_GET_EXTERNAL_STATE_SUPPORTED;
549 f->pcie_perf_req = mask & ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED;
550 f->pcie_dev_rdy = mask & ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED;
551 f->pcie_bus_width = mask & ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED;
552}
553
554/**
555 * amdgpu_atcs_verify_interface - verify ATCS
556 *
557 * @handle: acpi handle
558 * @atcs: amdgpu atcs struct
559 *
560 * Execute the ATCS_FUNCTION_VERIFY_INTERFACE ATCS function
561 * to initialize ATCS and determine what features are supported
562 * (all asics).
563 * returns 0 on success, error on failure.
564 */
565static int amdgpu_atcs_verify_interface(acpi_handle handle,
566 struct amdgpu_atcs *atcs)
567{
568 union acpi_object *info;
569 struct atcs_verify_interface output;
570 size_t size;
571 int err = 0;
572
573 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_VERIFY_INTERFACE, NULL);
574 if (!info)
575 return -EIO;
576
577 memset(&output, 0, sizeof(output));
578
579 size = *(u16 *) info->buffer.pointer;
580 if (size < 8) {
581 DRM_INFO("ATCS buffer is too small: %zu\n", size);
582 err = -EINVAL;
583 goto out;
584 }
585 size = min(sizeof(output), size);
586
587 memcpy(&output, info->buffer.pointer, size);
588
589 /* TODO: check version? */
590 DRM_DEBUG_DRIVER("ATCS version %u\n", output.version);
591
592 amdgpu_atcs_parse_functions(&atcs->functions, output.function_bits);
593
594out:
595 kfree(info);
596 return err;
597}
598
599/**
600 * amdgpu_acpi_is_pcie_performance_request_supported
601 *
602 * @adev: amdgpu_device pointer
603 *
604 * Check if the ATCS pcie_perf_req and pcie_dev_rdy methods
605 * are supported (all asics).
606 * returns true if supported, false if not.
607 */
608bool amdgpu_acpi_is_pcie_performance_request_supported(struct amdgpu_device *adev)
609{
610 struct amdgpu_atcs *atcs = &adev->atcs;
611
612 if (atcs->functions.pcie_perf_req && atcs->functions.pcie_dev_rdy)
613 return true;
614
615 return false;
616}
617
618/**
619 * amdgpu_acpi_pcie_notify_device_ready
620 *
621 * @adev: amdgpu_device pointer
622 *
623 * Executes the PCIE_DEVICE_READY_NOTIFICATION method
624 * (all asics).
625 * returns 0 on success, error on failure.
626 */
627int amdgpu_acpi_pcie_notify_device_ready(struct amdgpu_device *adev)
628{
629 acpi_handle handle;
630 union acpi_object *info;
631 struct amdgpu_atcs *atcs = &adev->atcs;
632
633 /* Get the device handle */
634 handle = ACPI_HANDLE(&adev->pdev->dev);
635 if (!handle)
636 return -EINVAL;
637
638 if (!atcs->functions.pcie_dev_rdy)
639 return -EINVAL;
640
641 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION, NULL);
642 if (!info)
643 return -EIO;
644
645 kfree(info);
646
647 return 0;
648}
649
650/**
651 * amdgpu_acpi_pcie_performance_request
652 *
653 * @adev: amdgpu_device pointer
654 * @perf_req: requested perf level (pcie gen speed)
655 * @advertise: set advertise caps flag if set
656 *
657 * Executes the PCIE_PERFORMANCE_REQUEST method to
658 * change the pcie gen speed (all asics).
659 * returns 0 on success, error on failure.
660 */
661int amdgpu_acpi_pcie_performance_request(struct amdgpu_device *adev,
662 u8 perf_req, bool advertise)
663{
664 acpi_handle handle;
665 union acpi_object *info;
666 struct amdgpu_atcs *atcs = &adev->atcs;
667 struct atcs_pref_req_input atcs_input;
668 struct atcs_pref_req_output atcs_output;
669 struct acpi_buffer params;
670 size_t size;
671 u32 retry = 3;
672
673 if (amdgpu_acpi_pcie_notify_device_ready(adev))
674 return -EINVAL;
675
676 /* Get the device handle */
677 handle = ACPI_HANDLE(&adev->pdev->dev);
678 if (!handle)
679 return -EINVAL;
680
681 if (!atcs->functions.pcie_perf_req)
682 return -EINVAL;
683
684 atcs_input.size = sizeof(struct atcs_pref_req_input);
685 /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
686 atcs_input.client_id = adev->pdev->devfn | (adev->pdev->bus->number << 8);
687 atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
688 atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
689 if (advertise)
690 atcs_input.flags |= ATCS_ADVERTISE_CAPS;
691 atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
692 atcs_input.perf_req = perf_req;
693
694 params.length = sizeof(struct atcs_pref_req_input);
695 params.pointer = &atcs_input;
696
697 while (retry--) {
698 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST, &params);
699 if (!info)
700 return -EIO;
701
702 memset(&atcs_output, 0, sizeof(atcs_output));
703
704 size = *(u16 *) info->buffer.pointer;
705 if (size < 3) {
706 DRM_INFO("ATCS buffer is too small: %zu\n", size);
707 kfree(info);
708 return -EINVAL;
709 }
710 size = min(sizeof(atcs_output), size);
711
712 memcpy(&atcs_output, info->buffer.pointer, size);
713
714 kfree(info);
715
716 switch (atcs_output.ret_val) {
717 case ATCS_REQUEST_REFUSED:
718 default:
719 return -EINVAL;
720 case ATCS_REQUEST_COMPLETE:
721 return 0;
722 case ATCS_REQUEST_IN_PROGRESS:
723 udelay(10);
724 break;
725 }
726 }
727
728 return 0;
729}
730
731/**
732 * amdgpu_acpi_event - handle notify events
733 *
734 * @nb: notifier block
735 * @val: val
736 * @data: acpi event
737 *
738 * Calls relevant amdgpu functions in response to various
739 * acpi events.
740 * Returns NOTIFY code
741 */
742static int amdgpu_acpi_event(struct notifier_block *nb,
743 unsigned long val,
744 void *data)
745{
746 struct amdgpu_device *adev = container_of(nb, struct amdgpu_device, acpi_nb);
747 struct acpi_bus_event *entry = (struct acpi_bus_event *)data;
748
749 if (strcmp(entry->device_class, ACPI_AC_CLASS) == 0) {
750 if (power_supply_is_system_supplied() > 0)
751 DRM_DEBUG_DRIVER("pm: AC\n");
752 else
753 DRM_DEBUG_DRIVER("pm: DC\n");
754
755 amdgpu_pm_acpi_event_handler(adev);
756 }
757
758 /* Check for pending SBIOS requests */
759 return amdgpu_atif_handler(adev, entry);
760}
761
762/* Call all ACPI methods here */
763/**
764 * amdgpu_acpi_init - init driver acpi support
765 *
766 * @adev: amdgpu_device pointer
767 *
768 * Verifies the AMD ACPI interfaces and registers with the acpi
769 * notifier chain (all asics).
770 * Returns 0 on success, error on failure.
771 */
772int amdgpu_acpi_init(struct amdgpu_device *adev)
773{
774 acpi_handle handle, atif_handle;
775 struct amdgpu_atif *atif;
776 struct amdgpu_atcs *atcs = &adev->atcs;
777 int ret;
778
779 /* Get the device handle */
780 handle = ACPI_HANDLE(&adev->pdev->dev);
781
782 if (!adev->bios || !handle)
783 return 0;
784
785 /* Call the ATCS method */
786 ret = amdgpu_atcs_verify_interface(handle, atcs);
787 if (ret) {
788 DRM_DEBUG_DRIVER("Call to ATCS verify_interface failed: %d\n", ret);
789 }
790
791 /* Probe for ATIF, and initialize it if found */
792 atif_handle = amdgpu_atif_probe_handle(handle);
793 if (!atif_handle)
794 goto out;
795
796 atif = kzalloc(sizeof(*atif), GFP_KERNEL);
797 if (!atif) {
798 DRM_WARN("Not enough memory to initialize ATIF\n");
799 goto out;
800 }
801 atif->handle = atif_handle;
802
803 /* Call the ATIF method */
804 ret = amdgpu_atif_verify_interface(atif);
805 if (ret) {
806 DRM_DEBUG_DRIVER("Call to ATIF verify_interface failed: %d\n", ret);
807 kfree(atif);
808 goto out;
809 }
810 adev->atif = atif;
811
812 if (atif->notifications.brightness_change) {
813 struct drm_encoder *tmp;
814
815 /* Find the encoder controlling the brightness */
816 list_for_each_entry(tmp, &adev->ddev->mode_config.encoder_list,
817 head) {
818 struct amdgpu_encoder *enc = to_amdgpu_encoder(tmp);
819
820 if ((enc->devices & (ATOM_DEVICE_LCD_SUPPORT)) &&
821 enc->enc_priv) {
822 struct amdgpu_encoder_atom_dig *dig = enc->enc_priv;
823 if (dig->bl_dev) {
824 atif->encoder_for_bl = enc;
825 break;
826 }
827 }
828 }
829 }
830
831 if (atif->functions.sbios_requests && !atif->functions.system_params) {
832 /* XXX check this workraround, if sbios request function is
833 * present we have to see how it's configured in the system
834 * params
835 */
836 atif->functions.system_params = true;
837 }
838
839 if (atif->functions.system_params) {
840 ret = amdgpu_atif_get_notification_params(atif);
841 if (ret) {
842 DRM_DEBUG_DRIVER("Call to GET_SYSTEM_PARAMS failed: %d\n",
843 ret);
844 /* Disable notification */
845 atif->notification_cfg.enabled = false;
846 }
847 }
848
849 if (atif->functions.query_backlight_transfer_characteristics) {
850 ret = amdgpu_atif_query_backlight_caps(atif);
851 if (ret) {
852 DRM_DEBUG_DRIVER("Call to QUERY_BACKLIGHT_TRANSFER_CHARACTERISTICS failed: %d\n",
853 ret);
854 atif->backlight_caps.caps_valid = false;
855 }
856 } else {
857 atif->backlight_caps.caps_valid = false;
858 }
859
860out:
861 adev->acpi_nb.notifier_call = amdgpu_acpi_event;
862 register_acpi_notifier(&adev->acpi_nb);
863
864 return ret;
865}
866
867void amdgpu_acpi_get_backlight_caps(struct amdgpu_device *adev,
868 struct amdgpu_dm_backlight_caps *caps)
869{
870 if (!adev->atif) {
871 caps->caps_valid = false;
872 return;
873 }
874 caps->caps_valid = adev->atif->backlight_caps.caps_valid;
875 caps->min_input_signal = adev->atif->backlight_caps.min_input_signal;
876 caps->max_input_signal = adev->atif->backlight_caps.max_input_signal;
877}
878
879/**
880 * amdgpu_acpi_fini - tear down driver acpi support
881 *
882 * @adev: amdgpu_device pointer
883 *
884 * Unregisters with the acpi notifier chain (all asics).
885 */
886void amdgpu_acpi_fini(struct amdgpu_device *adev)
887{
888 unregister_acpi_notifier(&adev->acpi_nb);
889 kfree(adev->atif);
890}
891