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1/*
2 * Copyright 2012 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 */
23
24#include <linux/pci.h>
25#include <linux/acpi.h>
26#include <linux/slab.h>
27#include <linux/power_supply.h>
28#include <linux/pm_runtime.h>
29#include <acpi/video.h>
30
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#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
68 struct backlight_device *bd;
69#endif
70 struct amdgpu_dm_backlight_caps backlight_caps;
71};
72
73/* Call the ATIF method
74 */
75/**
76 * amdgpu_atif_call - call an ATIF method
77 *
78 * @handle: acpi handle
79 * @function: the ATIF function to execute
80 * @params: ATIF function params
81 *
82 * Executes the requested ATIF function (all asics).
83 * Returns a pointer to the acpi output buffer.
84 */
85static union acpi_object *amdgpu_atif_call(struct amdgpu_atif *atif,
86 int function,
87 struct acpi_buffer *params)
88{
89 acpi_status status;
90 union acpi_object atif_arg_elements[2];
91 struct acpi_object_list atif_arg;
92 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
93
94 atif_arg.count = 2;
95 atif_arg.pointer = &atif_arg_elements[0];
96
97 atif_arg_elements[0].type = ACPI_TYPE_INTEGER;
98 atif_arg_elements[0].integer.value = function;
99
100 if (params) {
101 atif_arg_elements[1].type = ACPI_TYPE_BUFFER;
102 atif_arg_elements[1].buffer.length = params->length;
103 atif_arg_elements[1].buffer.pointer = params->pointer;
104 } else {
105 /* We need a second fake parameter */
106 atif_arg_elements[1].type = ACPI_TYPE_INTEGER;
107 atif_arg_elements[1].integer.value = 0;
108 }
109
110 status = acpi_evaluate_object(atif->handle, NULL, &atif_arg,
111 &buffer);
112
113 /* Fail only if calling the method fails and ATIF is supported */
114 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
115 DRM_DEBUG_DRIVER("failed to evaluate ATIF got %s\n",
116 acpi_format_exception(status));
117 kfree(buffer.pointer);
118 return NULL;
119 }
120
121 return buffer.pointer;
122}
123
124/**
125 * amdgpu_atif_parse_notification - parse supported notifications
126 *
127 * @n: supported notifications struct
128 * @mask: supported notifications mask from ATIF
129 *
130 * Use the supported notifications mask from ATIF function
131 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what notifications
132 * are supported (all asics).
133 */
134static void amdgpu_atif_parse_notification(struct amdgpu_atif_notifications *n, u32 mask)
135{
136 n->thermal_state = mask & ATIF_THERMAL_STATE_CHANGE_REQUEST_SUPPORTED;
137 n->forced_power_state = mask & ATIF_FORCED_POWER_STATE_CHANGE_REQUEST_SUPPORTED;
138 n->system_power_state = mask & ATIF_SYSTEM_POWER_SOURCE_CHANGE_REQUEST_SUPPORTED;
139 n->brightness_change = mask & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST_SUPPORTED;
140 n->dgpu_display_event = mask & ATIF_DGPU_DISPLAY_EVENT_SUPPORTED;
141 n->gpu_package_power_limit = mask & ATIF_GPU_PACKAGE_POWER_LIMIT_REQUEST_SUPPORTED;
142}
143
144/**
145 * amdgpu_atif_parse_functions - parse supported functions
146 *
147 * @f: supported functions struct
148 * @mask: supported functions mask from ATIF
149 *
150 * Use the supported functions mask from ATIF function
151 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what functions
152 * are supported (all asics).
153 */
154static void amdgpu_atif_parse_functions(struct amdgpu_atif_functions *f, u32 mask)
155{
156 f->system_params = mask & ATIF_GET_SYSTEM_PARAMETERS_SUPPORTED;
157 f->sbios_requests = mask & ATIF_GET_SYSTEM_BIOS_REQUESTS_SUPPORTED;
158 f->temperature_change = mask & ATIF_TEMPERATURE_CHANGE_NOTIFICATION_SUPPORTED;
159 f->query_backlight_transfer_characteristics =
160 mask & ATIF_QUERY_BACKLIGHT_TRANSFER_CHARACTERISTICS_SUPPORTED;
161 f->ready_to_undock = mask & ATIF_READY_TO_UNDOCK_NOTIFICATION_SUPPORTED;
162 f->external_gpu_information = mask & ATIF_GET_EXTERNAL_GPU_INFORMATION_SUPPORTED;
163}
164
165/**
166 * amdgpu_atif_verify_interface - verify ATIF
167 *
168 * @handle: acpi handle
169 * @atif: amdgpu atif struct
170 *
171 * Execute the ATIF_FUNCTION_VERIFY_INTERFACE ATIF function
172 * to initialize ATIF and determine what features are supported
173 * (all asics).
174 * returns 0 on success, error on failure.
175 */
176static int amdgpu_atif_verify_interface(struct amdgpu_atif *atif)
177{
178 union acpi_object *info;
179 struct atif_verify_interface output;
180 size_t size;
181 int err = 0;
182
183 info = amdgpu_atif_call(atif, ATIF_FUNCTION_VERIFY_INTERFACE, NULL);
184 if (!info)
185 return -EIO;
186
187 memset(&output, 0, sizeof(output));
188
189 size = *(u16 *) info->buffer.pointer;
190 if (size < 12) {
191 DRM_INFO("ATIF buffer is too small: %zu\n", size);
192 err = -EINVAL;
193 goto out;
194 }
195 size = min(sizeof(output), size);
196
197 memcpy(&output, info->buffer.pointer, size);
198
199 /* TODO: check version? */
200 DRM_DEBUG_DRIVER("ATIF version %u\n", output.version);
201
202 amdgpu_atif_parse_notification(&atif->notifications, output.notification_mask);
203 amdgpu_atif_parse_functions(&atif->functions, output.function_bits);
204
205out:
206 kfree(info);
207 return err;
208}
209
210static acpi_handle amdgpu_atif_probe_handle(acpi_handle dhandle)
211{
212 acpi_handle handle = NULL;
213 char acpi_method_name[255] = { 0 };
214 struct acpi_buffer buffer = { sizeof(acpi_method_name), acpi_method_name };
215 acpi_status status;
216
217 /* For PX/HG systems, ATIF and ATPX are in the iGPU's namespace, on dGPU only
218 * systems, ATIF is in the dGPU's namespace.
219 */
220 status = acpi_get_handle(dhandle, "ATIF", &handle);
221 if (ACPI_SUCCESS(status))
222 goto out;
223
224 if (amdgpu_has_atpx()) {
225 status = acpi_get_handle(amdgpu_atpx_get_dhandle(), "ATIF",
226 &handle);
227 if (ACPI_SUCCESS(status))
228 goto out;
229 }
230
231 DRM_DEBUG_DRIVER("No ATIF handle found\n");
232 return NULL;
233out:
234 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
235 DRM_DEBUG_DRIVER("Found ATIF handle %s\n", acpi_method_name);
236 return handle;
237}
238
239/**
240 * amdgpu_atif_get_notification_params - determine notify configuration
241 *
242 * @handle: acpi handle
243 * @n: atif notification configuration struct
244 *
245 * Execute the ATIF_FUNCTION_GET_SYSTEM_PARAMETERS ATIF function
246 * to determine if a notifier is used and if so which one
247 * (all asics). This is either Notify(VGA, 0x81) or Notify(VGA, n)
248 * where n is specified in the result if a notifier is used.
249 * Returns 0 on success, error on failure.
250 */
251static int amdgpu_atif_get_notification_params(struct amdgpu_atif *atif)
252{
253 union acpi_object *info;
254 struct amdgpu_atif_notification_cfg *n = &atif->notification_cfg;
255 struct atif_system_params params;
256 size_t size;
257 int err = 0;
258
259 info = amdgpu_atif_call(atif, ATIF_FUNCTION_GET_SYSTEM_PARAMETERS,
260 NULL);
261 if (!info) {
262 err = -EIO;
263 goto out;
264 }
265
266 size = *(u16 *) info->buffer.pointer;
267 if (size < 10) {
268 err = -EINVAL;
269 goto out;
270 }
271
272 memset(¶ms, 0, sizeof(params));
273 size = min(sizeof(params), size);
274 memcpy(¶ms, info->buffer.pointer, size);
275
276 DRM_DEBUG_DRIVER("SYSTEM_PARAMS: mask = %#x, flags = %#x\n",
277 params.flags, params.valid_mask);
278 params.flags = params.flags & params.valid_mask;
279
280 if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_NONE) {
281 n->enabled = false;
282 n->command_code = 0;
283 } else if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_81) {
284 n->enabled = true;
285 n->command_code = 0x81;
286 } else {
287 if (size < 11) {
288 err = -EINVAL;
289 goto out;
290 }
291 n->enabled = true;
292 n->command_code = params.command_code;
293 }
294
295out:
296 DRM_DEBUG_DRIVER("Notification %s, command code = %#x\n",
297 (n->enabled ? "enabled" : "disabled"),
298 n->command_code);
299 kfree(info);
300 return err;
301}
302
303/**
304 * amdgpu_atif_query_backlight_caps - get min and max backlight input signal
305 *
306 * @handle: acpi handle
307 *
308 * Execute the QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS ATIF function
309 * to determine the acceptable range of backlight values
310 *
311 * Backlight_caps.caps_valid will be set to true if the query is successful
312 *
313 * The input signals are in range 0-255
314 *
315 * This function assumes the display with backlight is the first LCD
316 *
317 * Returns 0 on success, error on failure.
318 */
319static int amdgpu_atif_query_backlight_caps(struct amdgpu_atif *atif)
320{
321 union acpi_object *info;
322 struct atif_qbtc_output characteristics;
323 struct atif_qbtc_arguments arguments;
324 struct acpi_buffer params;
325 size_t size;
326 int err = 0;
327
328 arguments.size = sizeof(arguments);
329 arguments.requested_display = ATIF_QBTC_REQUEST_LCD1;
330
331 params.length = sizeof(arguments);
332 params.pointer = (void *)&arguments;
333
334 info = amdgpu_atif_call(atif,
335 ATIF_FUNCTION_QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS,
336 ¶ms);
337 if (!info) {
338 err = -EIO;
339 goto out;
340 }
341
342 size = *(u16 *) info->buffer.pointer;
343 if (size < 10) {
344 err = -EINVAL;
345 goto out;
346 }
347
348 memset(&characteristics, 0, sizeof(characteristics));
349 size = min(sizeof(characteristics), size);
350 memcpy(&characteristics, info->buffer.pointer, size);
351
352 atif->backlight_caps.caps_valid = true;
353 atif->backlight_caps.min_input_signal =
354 characteristics.min_input_signal;
355 atif->backlight_caps.max_input_signal =
356 characteristics.max_input_signal;
357out:
358 kfree(info);
359 return err;
360}
361
362/**
363 * amdgpu_atif_get_sbios_requests - get requested sbios event
364 *
365 * @handle: acpi handle
366 * @req: atif sbios request struct
367 *
368 * Execute the ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS ATIF function
369 * to determine what requests the sbios is making to the driver
370 * (all asics).
371 * Returns 0 on success, error on failure.
372 */
373static int amdgpu_atif_get_sbios_requests(struct amdgpu_atif *atif,
374 struct atif_sbios_requests *req)
375{
376 union acpi_object *info;
377 size_t size;
378 int count = 0;
379
380 info = amdgpu_atif_call(atif, ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS,
381 NULL);
382 if (!info)
383 return -EIO;
384
385 size = *(u16 *)info->buffer.pointer;
386 if (size < 0xd) {
387 count = -EINVAL;
388 goto out;
389 }
390 memset(req, 0, sizeof(*req));
391
392 size = min(sizeof(*req), size);
393 memcpy(req, info->buffer.pointer, size);
394 DRM_DEBUG_DRIVER("SBIOS pending requests: %#x\n", req->pending);
395
396 count = hweight32(req->pending);
397
398out:
399 kfree(info);
400 return count;
401}
402
403/**
404 * amdgpu_atif_handler - handle ATIF notify requests
405 *
406 * @adev: amdgpu_device pointer
407 * @event: atif sbios request struct
408 *
409 * Checks the acpi event and if it matches an atif event,
410 * handles it.
411 *
412 * Returns:
413 * NOTIFY_BAD or NOTIFY_DONE, depending on the event.
414 */
415static int amdgpu_atif_handler(struct amdgpu_device *adev,
416 struct acpi_bus_event *event)
417{
418 struct amdgpu_atif *atif = adev->atif;
419 int count;
420
421 DRM_DEBUG_DRIVER("event, device_class = %s, type = %#x\n",
422 event->device_class, event->type);
423
424 if (strcmp(event->device_class, ACPI_VIDEO_CLASS) != 0)
425 return NOTIFY_DONE;
426
427 /* Is this actually our event? */
428 if (!atif ||
429 !atif->notification_cfg.enabled ||
430 event->type != atif->notification_cfg.command_code) {
431 /* These events will generate keypresses otherwise */
432 if (event->type == ACPI_VIDEO_NOTIFY_PROBE)
433 return NOTIFY_BAD;
434 else
435 return NOTIFY_DONE;
436 }
437
438 if (atif->functions.sbios_requests) {
439 struct atif_sbios_requests req;
440
441 /* Check pending SBIOS requests */
442 count = amdgpu_atif_get_sbios_requests(atif, &req);
443
444 if (count <= 0)
445 return NOTIFY_BAD;
446
447 DRM_DEBUG_DRIVER("ATIF: %d pending SBIOS requests\n", count);
448
449 if (req.pending & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST) {
450#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
451 if (atif->bd) {
452 DRM_DEBUG_DRIVER("Changing brightness to %d\n",
453 req.backlight_level);
454 /*
455 * XXX backlight_device_set_brightness() is
456 * hardwired to post BACKLIGHT_UPDATE_SYSFS.
457 * It probably should accept 'reason' parameter.
458 */
459 backlight_device_set_brightness(atif->bd, req.backlight_level);
460 }
461#endif
462 }
463
464 if (req.pending & ATIF_DGPU_DISPLAY_EVENT) {
465 if (adev->flags & AMD_IS_PX) {
466 pm_runtime_get_sync(adev->ddev->dev);
467 /* Just fire off a uevent and let userspace tell us what to do */
468 drm_helper_hpd_irq_event(adev->ddev);
469 pm_runtime_mark_last_busy(adev->ddev->dev);
470 pm_runtime_put_autosuspend(adev->ddev->dev);
471 }
472 }
473 /* TODO: check other events */
474 }
475
476 /* We've handled the event, stop the notifier chain. The ACPI interface
477 * overloads ACPI_VIDEO_NOTIFY_PROBE, we don't want to send that to
478 * userspace if the event was generated only to signal a SBIOS
479 * request.
480 */
481 return NOTIFY_BAD;
482}
483
484/* Call the ATCS method
485 */
486/**
487 * amdgpu_atcs_call - call an ATCS method
488 *
489 * @handle: acpi handle
490 * @function: the ATCS function to execute
491 * @params: ATCS function params
492 *
493 * Executes the requested ATCS function (all asics).
494 * Returns a pointer to the acpi output buffer.
495 */
496static union acpi_object *amdgpu_atcs_call(acpi_handle handle, int function,
497 struct acpi_buffer *params)
498{
499 acpi_status status;
500 union acpi_object atcs_arg_elements[2];
501 struct acpi_object_list atcs_arg;
502 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
503
504 atcs_arg.count = 2;
505 atcs_arg.pointer = &atcs_arg_elements[0];
506
507 atcs_arg_elements[0].type = ACPI_TYPE_INTEGER;
508 atcs_arg_elements[0].integer.value = function;
509
510 if (params) {
511 atcs_arg_elements[1].type = ACPI_TYPE_BUFFER;
512 atcs_arg_elements[1].buffer.length = params->length;
513 atcs_arg_elements[1].buffer.pointer = params->pointer;
514 } else {
515 /* We need a second fake parameter */
516 atcs_arg_elements[1].type = ACPI_TYPE_INTEGER;
517 atcs_arg_elements[1].integer.value = 0;
518 }
519
520 status = acpi_evaluate_object(handle, "ATCS", &atcs_arg, &buffer);
521
522 /* Fail only if calling the method fails and ATIF is supported */
523 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
524 DRM_DEBUG_DRIVER("failed to evaluate ATCS got %s\n",
525 acpi_format_exception(status));
526 kfree(buffer.pointer);
527 return NULL;
528 }
529
530 return buffer.pointer;
531}
532
533/**
534 * amdgpu_atcs_parse_functions - parse supported functions
535 *
536 * @f: supported functions struct
537 * @mask: supported functions mask from ATCS
538 *
539 * Use the supported functions mask from ATCS function
540 * ATCS_FUNCTION_VERIFY_INTERFACE to determine what functions
541 * are supported (all asics).
542 */
543static void amdgpu_atcs_parse_functions(struct amdgpu_atcs_functions *f, u32 mask)
544{
545 f->get_ext_state = mask & ATCS_GET_EXTERNAL_STATE_SUPPORTED;
546 f->pcie_perf_req = mask & ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED;
547 f->pcie_dev_rdy = mask & ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED;
548 f->pcie_bus_width = mask & ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED;
549}
550
551/**
552 * amdgpu_atcs_verify_interface - verify ATCS
553 *
554 * @handle: acpi handle
555 * @atcs: amdgpu atcs struct
556 *
557 * Execute the ATCS_FUNCTION_VERIFY_INTERFACE ATCS function
558 * to initialize ATCS and determine what features are supported
559 * (all asics).
560 * returns 0 on success, error on failure.
561 */
562static int amdgpu_atcs_verify_interface(acpi_handle handle,
563 struct amdgpu_atcs *atcs)
564{
565 union acpi_object *info;
566 struct atcs_verify_interface output;
567 size_t size;
568 int err = 0;
569
570 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_VERIFY_INTERFACE, NULL);
571 if (!info)
572 return -EIO;
573
574 memset(&output, 0, sizeof(output));
575
576 size = *(u16 *) info->buffer.pointer;
577 if (size < 8) {
578 DRM_INFO("ATCS buffer is too small: %zu\n", size);
579 err = -EINVAL;
580 goto out;
581 }
582 size = min(sizeof(output), size);
583
584 memcpy(&output, info->buffer.pointer, size);
585
586 /* TODO: check version? */
587 DRM_DEBUG_DRIVER("ATCS version %u\n", output.version);
588
589 amdgpu_atcs_parse_functions(&atcs->functions, output.function_bits);
590
591out:
592 kfree(info);
593 return err;
594}
595
596/**
597 * amdgpu_acpi_is_pcie_performance_request_supported
598 *
599 * @adev: amdgpu_device pointer
600 *
601 * Check if the ATCS pcie_perf_req and pcie_dev_rdy methods
602 * are supported (all asics).
603 * returns true if supported, false if not.
604 */
605bool amdgpu_acpi_is_pcie_performance_request_supported(struct amdgpu_device *adev)
606{
607 struct amdgpu_atcs *atcs = &adev->atcs;
608
609 if (atcs->functions.pcie_perf_req && atcs->functions.pcie_dev_rdy)
610 return true;
611
612 return false;
613}
614
615/**
616 * amdgpu_acpi_pcie_notify_device_ready
617 *
618 * @adev: amdgpu_device pointer
619 *
620 * Executes the PCIE_DEVICE_READY_NOTIFICATION method
621 * (all asics).
622 * returns 0 on success, error on failure.
623 */
624int amdgpu_acpi_pcie_notify_device_ready(struct amdgpu_device *adev)
625{
626 acpi_handle handle;
627 union acpi_object *info;
628 struct amdgpu_atcs *atcs = &adev->atcs;
629
630 /* Get the device handle */
631 handle = ACPI_HANDLE(&adev->pdev->dev);
632 if (!handle)
633 return -EINVAL;
634
635 if (!atcs->functions.pcie_dev_rdy)
636 return -EINVAL;
637
638 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION, NULL);
639 if (!info)
640 return -EIO;
641
642 kfree(info);
643
644 return 0;
645}
646
647/**
648 * amdgpu_acpi_pcie_performance_request
649 *
650 * @adev: amdgpu_device pointer
651 * @perf_req: requested perf level (pcie gen speed)
652 * @advertise: set advertise caps flag if set
653 *
654 * Executes the PCIE_PERFORMANCE_REQUEST method to
655 * change the pcie gen speed (all asics).
656 * returns 0 on success, error on failure.
657 */
658int amdgpu_acpi_pcie_performance_request(struct amdgpu_device *adev,
659 u8 perf_req, bool advertise)
660{
661 acpi_handle handle;
662 union acpi_object *info;
663 struct amdgpu_atcs *atcs = &adev->atcs;
664 struct atcs_pref_req_input atcs_input;
665 struct atcs_pref_req_output atcs_output;
666 struct acpi_buffer params;
667 size_t size;
668 u32 retry = 3;
669
670 if (amdgpu_acpi_pcie_notify_device_ready(adev))
671 return -EINVAL;
672
673 /* Get the device handle */
674 handle = ACPI_HANDLE(&adev->pdev->dev);
675 if (!handle)
676 return -EINVAL;
677
678 if (!atcs->functions.pcie_perf_req)
679 return -EINVAL;
680
681 atcs_input.size = sizeof(struct atcs_pref_req_input);
682 /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
683 atcs_input.client_id = adev->pdev->devfn | (adev->pdev->bus->number << 8);
684 atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
685 atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
686 if (advertise)
687 atcs_input.flags |= ATCS_ADVERTISE_CAPS;
688 atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
689 atcs_input.perf_req = perf_req;
690
691 params.length = sizeof(struct atcs_pref_req_input);
692 params.pointer = &atcs_input;
693
694 while (retry--) {
695 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST, ¶ms);
696 if (!info)
697 return -EIO;
698
699 memset(&atcs_output, 0, sizeof(atcs_output));
700
701 size = *(u16 *) info->buffer.pointer;
702 if (size < 3) {
703 DRM_INFO("ATCS buffer is too small: %zu\n", size);
704 kfree(info);
705 return -EINVAL;
706 }
707 size = min(sizeof(atcs_output), size);
708
709 memcpy(&atcs_output, info->buffer.pointer, size);
710
711 kfree(info);
712
713 switch (atcs_output.ret_val) {
714 case ATCS_REQUEST_REFUSED:
715 default:
716 return -EINVAL;
717 case ATCS_REQUEST_COMPLETE:
718 return 0;
719 case ATCS_REQUEST_IN_PROGRESS:
720 udelay(10);
721 break;
722 }
723 }
724
725 return 0;
726}
727
728/**
729 * amdgpu_acpi_event - handle notify events
730 *
731 * @nb: notifier block
732 * @val: val
733 * @data: acpi event
734 *
735 * Calls relevant amdgpu functions in response to various
736 * acpi events.
737 * Returns NOTIFY code
738 */
739static int amdgpu_acpi_event(struct notifier_block *nb,
740 unsigned long val,
741 void *data)
742{
743 struct amdgpu_device *adev = container_of(nb, struct amdgpu_device, acpi_nb);
744 struct acpi_bus_event *entry = (struct acpi_bus_event *)data;
745
746 if (strcmp(entry->device_class, ACPI_AC_CLASS) == 0) {
747 if (power_supply_is_system_supplied() > 0)
748 DRM_DEBUG_DRIVER("pm: AC\n");
749 else
750 DRM_DEBUG_DRIVER("pm: DC\n");
751
752 amdgpu_pm_acpi_event_handler(adev);
753 }
754
755 /* Check for pending SBIOS requests */
756 return amdgpu_atif_handler(adev, entry);
757}
758
759/* Call all ACPI methods here */
760/**
761 * amdgpu_acpi_init - init driver acpi support
762 *
763 * @adev: amdgpu_device pointer
764 *
765 * Verifies the AMD ACPI interfaces and registers with the acpi
766 * notifier chain (all asics).
767 * Returns 0 on success, error on failure.
768 */
769int amdgpu_acpi_init(struct amdgpu_device *adev)
770{
771 acpi_handle handle, atif_handle;
772 struct amdgpu_atif *atif;
773 struct amdgpu_atcs *atcs = &adev->atcs;
774 int ret;
775
776 /* Get the device handle */
777 handle = ACPI_HANDLE(&adev->pdev->dev);
778
779 if (!adev->bios || !handle)
780 return 0;
781
782 /* Call the ATCS method */
783 ret = amdgpu_atcs_verify_interface(handle, atcs);
784 if (ret) {
785 DRM_DEBUG_DRIVER("Call to ATCS verify_interface failed: %d\n", ret);
786 }
787
788 /* Probe for ATIF, and initialize it if found */
789 atif_handle = amdgpu_atif_probe_handle(handle);
790 if (!atif_handle)
791 goto out;
792
793 atif = kzalloc(sizeof(*atif), GFP_KERNEL);
794 if (!atif) {
795 DRM_WARN("Not enough memory to initialize ATIF\n");
796 goto out;
797 }
798 atif->handle = atif_handle;
799
800 /* Call the ATIF method */
801 ret = amdgpu_atif_verify_interface(atif);
802 if (ret) {
803 DRM_DEBUG_DRIVER("Call to ATIF verify_interface failed: %d\n", ret);
804 kfree(atif);
805 goto out;
806 }
807 adev->atif = atif;
808
809 if (atif->notifications.brightness_change) {
810#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
811 if (amdgpu_device_has_dc_support(adev)) {
812#if defined(CONFIG_DRM_AMD_DC)
813 struct amdgpu_display_manager *dm = &adev->dm;
814 atif->bd = dm->backlight_dev;
815#endif
816 } else {
817 struct drm_encoder *tmp;
818
819 /* Find the encoder controlling the brightness */
820 list_for_each_entry(tmp, &adev->ddev->mode_config.encoder_list,
821 head) {
822 struct amdgpu_encoder *enc = to_amdgpu_encoder(tmp);
823
824 if ((enc->devices & (ATOM_DEVICE_LCD_SUPPORT)) &&
825 enc->enc_priv) {
826 struct amdgpu_encoder_atom_dig *dig = enc->enc_priv;
827 if (dig->bl_dev) {
828 atif->bd = dig->bl_dev;
829 break;
830 }
831 }
832 }
833 }
834 }
835#endif
836
837 if (atif->functions.sbios_requests && !atif->functions.system_params) {
838 /* XXX check this workraround, if sbios request function is
839 * present we have to see how it's configured in the system
840 * params
841 */
842 atif->functions.system_params = true;
843 }
844
845 if (atif->functions.system_params) {
846 ret = amdgpu_atif_get_notification_params(atif);
847 if (ret) {
848 DRM_DEBUG_DRIVER("Call to GET_SYSTEM_PARAMS failed: %d\n",
849 ret);
850 /* Disable notification */
851 atif->notification_cfg.enabled = false;
852 }
853 }
854
855 if (atif->functions.query_backlight_transfer_characteristics) {
856 ret = amdgpu_atif_query_backlight_caps(atif);
857 if (ret) {
858 DRM_DEBUG_DRIVER("Call to QUERY_BACKLIGHT_TRANSFER_CHARACTERISTICS failed: %d\n",
859 ret);
860 atif->backlight_caps.caps_valid = false;
861 }
862 } else {
863 atif->backlight_caps.caps_valid = false;
864 }
865
866out:
867 adev->acpi_nb.notifier_call = amdgpu_acpi_event;
868 register_acpi_notifier(&adev->acpi_nb);
869
870 return ret;
871}
872
873void amdgpu_acpi_get_backlight_caps(struct amdgpu_device *adev,
874 struct amdgpu_dm_backlight_caps *caps)
875{
876 if (!adev->atif) {
877 caps->caps_valid = false;
878 return;
879 }
880 caps->caps_valid = adev->atif->backlight_caps.caps_valid;
881 caps->min_input_signal = adev->atif->backlight_caps.min_input_signal;
882 caps->max_input_signal = adev->atif->backlight_caps.max_input_signal;
883}
884
885/**
886 * amdgpu_acpi_fini - tear down driver acpi support
887 *
888 * @adev: amdgpu_device pointer
889 *
890 * Unregisters with the acpi notifier chain (all asics).
891 */
892void amdgpu_acpi_fini(struct amdgpu_device *adev)
893{
894 unregister_acpi_notifier(&adev->acpi_nb);
895 kfree(adev->atif);
896}
1/*
2 * Copyright 2012 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 */
23
24#include <linux/pci.h>
25#include <linux/acpi.h>
26#include <linux/slab.h>
27#include <linux/power_supply.h>
28#include <linux/pm_runtime.h>
29#include <acpi/video.h>
30#include <drm/drmP.h>
31#include <drm/drm_crtc_helper.h>
32#include "amdgpu.h"
33#include "amdgpu_pm.h"
34#include "amd_acpi.h"
35#include "atom.h"
36
37/* Call the ATIF method
38 */
39/**
40 * amdgpu_atif_call - call an ATIF method
41 *
42 * @handle: acpi handle
43 * @function: the ATIF function to execute
44 * @params: ATIF function params
45 *
46 * Executes the requested ATIF function (all asics).
47 * Returns a pointer to the acpi output buffer.
48 */
49static union acpi_object *amdgpu_atif_call(acpi_handle handle, int function,
50 struct acpi_buffer *params)
51{
52 acpi_status status;
53 union acpi_object atif_arg_elements[2];
54 struct acpi_object_list atif_arg;
55 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
56
57 atif_arg.count = 2;
58 atif_arg.pointer = &atif_arg_elements[0];
59
60 atif_arg_elements[0].type = ACPI_TYPE_INTEGER;
61 atif_arg_elements[0].integer.value = function;
62
63 if (params) {
64 atif_arg_elements[1].type = ACPI_TYPE_BUFFER;
65 atif_arg_elements[1].buffer.length = params->length;
66 atif_arg_elements[1].buffer.pointer = params->pointer;
67 } else {
68 /* We need a second fake parameter */
69 atif_arg_elements[1].type = ACPI_TYPE_INTEGER;
70 atif_arg_elements[1].integer.value = 0;
71 }
72
73 status = acpi_evaluate_object(handle, "ATIF", &atif_arg, &buffer);
74
75 /* Fail only if calling the method fails and ATIF is supported */
76 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
77 DRM_DEBUG_DRIVER("failed to evaluate ATIF got %s\n",
78 acpi_format_exception(status));
79 kfree(buffer.pointer);
80 return NULL;
81 }
82
83 return buffer.pointer;
84}
85
86/**
87 * amdgpu_atif_parse_notification - parse supported notifications
88 *
89 * @n: supported notifications struct
90 * @mask: supported notifications mask from ATIF
91 *
92 * Use the supported notifications mask from ATIF function
93 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what notifications
94 * are supported (all asics).
95 */
96static void amdgpu_atif_parse_notification(struct amdgpu_atif_notifications *n, u32 mask)
97{
98 n->display_switch = mask & ATIF_DISPLAY_SWITCH_REQUEST_SUPPORTED;
99 n->expansion_mode_change = mask & ATIF_EXPANSION_MODE_CHANGE_REQUEST_SUPPORTED;
100 n->thermal_state = mask & ATIF_THERMAL_STATE_CHANGE_REQUEST_SUPPORTED;
101 n->forced_power_state = mask & ATIF_FORCED_POWER_STATE_CHANGE_REQUEST_SUPPORTED;
102 n->system_power_state = mask & ATIF_SYSTEM_POWER_SOURCE_CHANGE_REQUEST_SUPPORTED;
103 n->display_conf_change = mask & ATIF_DISPLAY_CONF_CHANGE_REQUEST_SUPPORTED;
104 n->px_gfx_switch = mask & ATIF_PX_GFX_SWITCH_REQUEST_SUPPORTED;
105 n->brightness_change = mask & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST_SUPPORTED;
106 n->dgpu_display_event = mask & ATIF_DGPU_DISPLAY_EVENT_SUPPORTED;
107}
108
109/**
110 * amdgpu_atif_parse_functions - parse supported functions
111 *
112 * @f: supported functions struct
113 * @mask: supported functions mask from ATIF
114 *
115 * Use the supported functions mask from ATIF function
116 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what functions
117 * are supported (all asics).
118 */
119static void amdgpu_atif_parse_functions(struct amdgpu_atif_functions *f, u32 mask)
120{
121 f->system_params = mask & ATIF_GET_SYSTEM_PARAMETERS_SUPPORTED;
122 f->sbios_requests = mask & ATIF_GET_SYSTEM_BIOS_REQUESTS_SUPPORTED;
123 f->select_active_disp = mask & ATIF_SELECT_ACTIVE_DISPLAYS_SUPPORTED;
124 f->lid_state = mask & ATIF_GET_LID_STATE_SUPPORTED;
125 f->get_tv_standard = mask & ATIF_GET_TV_STANDARD_FROM_CMOS_SUPPORTED;
126 f->set_tv_standard = mask & ATIF_SET_TV_STANDARD_IN_CMOS_SUPPORTED;
127 f->get_panel_expansion_mode = mask & ATIF_GET_PANEL_EXPANSION_MODE_FROM_CMOS_SUPPORTED;
128 f->set_panel_expansion_mode = mask & ATIF_SET_PANEL_EXPANSION_MODE_IN_CMOS_SUPPORTED;
129 f->temperature_change = mask & ATIF_TEMPERATURE_CHANGE_NOTIFICATION_SUPPORTED;
130 f->graphics_device_types = mask & ATIF_GET_GRAPHICS_DEVICE_TYPES_SUPPORTED;
131}
132
133/**
134 * amdgpu_atif_verify_interface - verify ATIF
135 *
136 * @handle: acpi handle
137 * @atif: amdgpu atif struct
138 *
139 * Execute the ATIF_FUNCTION_VERIFY_INTERFACE ATIF function
140 * to initialize ATIF and determine what features are supported
141 * (all asics).
142 * returns 0 on success, error on failure.
143 */
144static int amdgpu_atif_verify_interface(acpi_handle handle,
145 struct amdgpu_atif *atif)
146{
147 union acpi_object *info;
148 struct atif_verify_interface output;
149 size_t size;
150 int err = 0;
151
152 info = amdgpu_atif_call(handle, ATIF_FUNCTION_VERIFY_INTERFACE, NULL);
153 if (!info)
154 return -EIO;
155
156 memset(&output, 0, sizeof(output));
157
158 size = *(u16 *) info->buffer.pointer;
159 if (size < 12) {
160 DRM_INFO("ATIF buffer is too small: %zu\n", size);
161 err = -EINVAL;
162 goto out;
163 }
164 size = min(sizeof(output), size);
165
166 memcpy(&output, info->buffer.pointer, size);
167
168 /* TODO: check version? */
169 DRM_DEBUG_DRIVER("ATIF version %u\n", output.version);
170
171 amdgpu_atif_parse_notification(&atif->notifications, output.notification_mask);
172 amdgpu_atif_parse_functions(&atif->functions, output.function_bits);
173
174out:
175 kfree(info);
176 return err;
177}
178
179/**
180 * amdgpu_atif_get_notification_params - determine notify configuration
181 *
182 * @handle: acpi handle
183 * @n: atif notification configuration struct
184 *
185 * Execute the ATIF_FUNCTION_GET_SYSTEM_PARAMETERS ATIF function
186 * to determine if a notifier is used and if so which one
187 * (all asics). This is either Notify(VGA, 0x81) or Notify(VGA, n)
188 * where n is specified in the result if a notifier is used.
189 * Returns 0 on success, error on failure.
190 */
191static int amdgpu_atif_get_notification_params(acpi_handle handle,
192 struct amdgpu_atif_notification_cfg *n)
193{
194 union acpi_object *info;
195 struct atif_system_params params;
196 size_t size;
197 int err = 0;
198
199 info = amdgpu_atif_call(handle, ATIF_FUNCTION_GET_SYSTEM_PARAMETERS, NULL);
200 if (!info) {
201 err = -EIO;
202 goto out;
203 }
204
205 size = *(u16 *) info->buffer.pointer;
206 if (size < 10) {
207 err = -EINVAL;
208 goto out;
209 }
210
211 memset(¶ms, 0, sizeof(params));
212 size = min(sizeof(params), size);
213 memcpy(¶ms, info->buffer.pointer, size);
214
215 DRM_DEBUG_DRIVER("SYSTEM_PARAMS: mask = %#x, flags = %#x\n",
216 params.flags, params.valid_mask);
217 params.flags = params.flags & params.valid_mask;
218
219 if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_NONE) {
220 n->enabled = false;
221 n->command_code = 0;
222 } else if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_81) {
223 n->enabled = true;
224 n->command_code = 0x81;
225 } else {
226 if (size < 11) {
227 err = -EINVAL;
228 goto out;
229 }
230 n->enabled = true;
231 n->command_code = params.command_code;
232 }
233
234out:
235 DRM_DEBUG_DRIVER("Notification %s, command code = %#x\n",
236 (n->enabled ? "enabled" : "disabled"),
237 n->command_code);
238 kfree(info);
239 return err;
240}
241
242/**
243 * amdgpu_atif_get_sbios_requests - get requested sbios event
244 *
245 * @handle: acpi handle
246 * @req: atif sbios request struct
247 *
248 * Execute the ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS ATIF function
249 * to determine what requests the sbios is making to the driver
250 * (all asics).
251 * Returns 0 on success, error on failure.
252 */
253static int amdgpu_atif_get_sbios_requests(acpi_handle handle,
254 struct atif_sbios_requests *req)
255{
256 union acpi_object *info;
257 size_t size;
258 int count = 0;
259
260 info = amdgpu_atif_call(handle, ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS, NULL);
261 if (!info)
262 return -EIO;
263
264 size = *(u16 *)info->buffer.pointer;
265 if (size < 0xd) {
266 count = -EINVAL;
267 goto out;
268 }
269 memset(req, 0, sizeof(*req));
270
271 size = min(sizeof(*req), size);
272 memcpy(req, info->buffer.pointer, size);
273 DRM_DEBUG_DRIVER("SBIOS pending requests: %#x\n", req->pending);
274
275 count = hweight32(req->pending);
276
277out:
278 kfree(info);
279 return count;
280}
281
282/**
283 * amdgpu_atif_handler - handle ATIF notify requests
284 *
285 * @adev: amdgpu_device pointer
286 * @event: atif sbios request struct
287 *
288 * Checks the acpi event and if it matches an atif event,
289 * handles it.
290 * Returns NOTIFY code
291 */
292static int amdgpu_atif_handler(struct amdgpu_device *adev,
293 struct acpi_bus_event *event)
294{
295 struct amdgpu_atif *atif = &adev->atif;
296 struct atif_sbios_requests req;
297 acpi_handle handle;
298 int count;
299
300 DRM_DEBUG_DRIVER("event, device_class = %s, type = %#x\n",
301 event->device_class, event->type);
302
303 if (strcmp(event->device_class, ACPI_VIDEO_CLASS) != 0)
304 return NOTIFY_DONE;
305
306 if (!atif->notification_cfg.enabled ||
307 event->type != atif->notification_cfg.command_code)
308 /* Not our event */
309 return NOTIFY_DONE;
310
311 /* Check pending SBIOS requests */
312 handle = ACPI_HANDLE(&adev->pdev->dev);
313 count = amdgpu_atif_get_sbios_requests(handle, &req);
314
315 if (count <= 0)
316 return NOTIFY_DONE;
317
318 DRM_DEBUG_DRIVER("ATIF: %d pending SBIOS requests\n", count);
319
320 if (req.pending & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST) {
321 struct amdgpu_encoder *enc = atif->encoder_for_bl;
322
323 if (enc) {
324 struct amdgpu_encoder_atom_dig *dig = enc->enc_priv;
325
326 DRM_DEBUG_DRIVER("Changing brightness to %d\n",
327 req.backlight_level);
328
329 amdgpu_display_backlight_set_level(adev, enc, req.backlight_level);
330
331#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
332 backlight_force_update(dig->bl_dev,
333 BACKLIGHT_UPDATE_HOTKEY);
334#endif
335 }
336 }
337 if (req.pending & ATIF_DGPU_DISPLAY_EVENT) {
338 if ((adev->flags & AMD_IS_PX) &&
339 amdgpu_atpx_dgpu_req_power_for_displays()) {
340 pm_runtime_get_sync(adev->ddev->dev);
341 /* Just fire off a uevent and let userspace tell us what to do */
342 drm_helper_hpd_irq_event(adev->ddev);
343 pm_runtime_mark_last_busy(adev->ddev->dev);
344 pm_runtime_put_autosuspend(adev->ddev->dev);
345 }
346 }
347 /* TODO: check other events */
348
349 /* We've handled the event, stop the notifier chain. The ACPI interface
350 * overloads ACPI_VIDEO_NOTIFY_PROBE, we don't want to send that to
351 * userspace if the event was generated only to signal a SBIOS
352 * request.
353 */
354 return NOTIFY_BAD;
355}
356
357/* Call the ATCS method
358 */
359/**
360 * amdgpu_atcs_call - call an ATCS method
361 *
362 * @handle: acpi handle
363 * @function: the ATCS function to execute
364 * @params: ATCS function params
365 *
366 * Executes the requested ATCS function (all asics).
367 * Returns a pointer to the acpi output buffer.
368 */
369static union acpi_object *amdgpu_atcs_call(acpi_handle handle, int function,
370 struct acpi_buffer *params)
371{
372 acpi_status status;
373 union acpi_object atcs_arg_elements[2];
374 struct acpi_object_list atcs_arg;
375 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
376
377 atcs_arg.count = 2;
378 atcs_arg.pointer = &atcs_arg_elements[0];
379
380 atcs_arg_elements[0].type = ACPI_TYPE_INTEGER;
381 atcs_arg_elements[0].integer.value = function;
382
383 if (params) {
384 atcs_arg_elements[1].type = ACPI_TYPE_BUFFER;
385 atcs_arg_elements[1].buffer.length = params->length;
386 atcs_arg_elements[1].buffer.pointer = params->pointer;
387 } else {
388 /* We need a second fake parameter */
389 atcs_arg_elements[1].type = ACPI_TYPE_INTEGER;
390 atcs_arg_elements[1].integer.value = 0;
391 }
392
393 status = acpi_evaluate_object(handle, "ATCS", &atcs_arg, &buffer);
394
395 /* Fail only if calling the method fails and ATIF is supported */
396 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
397 DRM_DEBUG_DRIVER("failed to evaluate ATCS got %s\n",
398 acpi_format_exception(status));
399 kfree(buffer.pointer);
400 return NULL;
401 }
402
403 return buffer.pointer;
404}
405
406/**
407 * amdgpu_atcs_parse_functions - parse supported functions
408 *
409 * @f: supported functions struct
410 * @mask: supported functions mask from ATCS
411 *
412 * Use the supported functions mask from ATCS function
413 * ATCS_FUNCTION_VERIFY_INTERFACE to determine what functions
414 * are supported (all asics).
415 */
416static void amdgpu_atcs_parse_functions(struct amdgpu_atcs_functions *f, u32 mask)
417{
418 f->get_ext_state = mask & ATCS_GET_EXTERNAL_STATE_SUPPORTED;
419 f->pcie_perf_req = mask & ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED;
420 f->pcie_dev_rdy = mask & ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED;
421 f->pcie_bus_width = mask & ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED;
422}
423
424/**
425 * amdgpu_atcs_verify_interface - verify ATCS
426 *
427 * @handle: acpi handle
428 * @atcs: amdgpu atcs struct
429 *
430 * Execute the ATCS_FUNCTION_VERIFY_INTERFACE ATCS function
431 * to initialize ATCS and determine what features are supported
432 * (all asics).
433 * returns 0 on success, error on failure.
434 */
435static int amdgpu_atcs_verify_interface(acpi_handle handle,
436 struct amdgpu_atcs *atcs)
437{
438 union acpi_object *info;
439 struct atcs_verify_interface output;
440 size_t size;
441 int err = 0;
442
443 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_VERIFY_INTERFACE, NULL);
444 if (!info)
445 return -EIO;
446
447 memset(&output, 0, sizeof(output));
448
449 size = *(u16 *) info->buffer.pointer;
450 if (size < 8) {
451 DRM_INFO("ATCS buffer is too small: %zu\n", size);
452 err = -EINVAL;
453 goto out;
454 }
455 size = min(sizeof(output), size);
456
457 memcpy(&output, info->buffer.pointer, size);
458
459 /* TODO: check version? */
460 DRM_DEBUG_DRIVER("ATCS version %u\n", output.version);
461
462 amdgpu_atcs_parse_functions(&atcs->functions, output.function_bits);
463
464out:
465 kfree(info);
466 return err;
467}
468
469/**
470 * amdgpu_acpi_is_pcie_performance_request_supported
471 *
472 * @adev: amdgpu_device pointer
473 *
474 * Check if the ATCS pcie_perf_req and pcie_dev_rdy methods
475 * are supported (all asics).
476 * returns true if supported, false if not.
477 */
478bool amdgpu_acpi_is_pcie_performance_request_supported(struct amdgpu_device *adev)
479{
480 struct amdgpu_atcs *atcs = &adev->atcs;
481
482 if (atcs->functions.pcie_perf_req && atcs->functions.pcie_dev_rdy)
483 return true;
484
485 return false;
486}
487
488/**
489 * amdgpu_acpi_pcie_notify_device_ready
490 *
491 * @adev: amdgpu_device pointer
492 *
493 * Executes the PCIE_DEVICE_READY_NOTIFICATION method
494 * (all asics).
495 * returns 0 on success, error on failure.
496 */
497int amdgpu_acpi_pcie_notify_device_ready(struct amdgpu_device *adev)
498{
499 acpi_handle handle;
500 union acpi_object *info;
501 struct amdgpu_atcs *atcs = &adev->atcs;
502
503 /* Get the device handle */
504 handle = ACPI_HANDLE(&adev->pdev->dev);
505 if (!handle)
506 return -EINVAL;
507
508 if (!atcs->functions.pcie_dev_rdy)
509 return -EINVAL;
510
511 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION, NULL);
512 if (!info)
513 return -EIO;
514
515 kfree(info);
516
517 return 0;
518}
519
520/**
521 * amdgpu_acpi_pcie_performance_request
522 *
523 * @adev: amdgpu_device pointer
524 * @perf_req: requested perf level (pcie gen speed)
525 * @advertise: set advertise caps flag if set
526 *
527 * Executes the PCIE_PERFORMANCE_REQUEST method to
528 * change the pcie gen speed (all asics).
529 * returns 0 on success, error on failure.
530 */
531int amdgpu_acpi_pcie_performance_request(struct amdgpu_device *adev,
532 u8 perf_req, bool advertise)
533{
534 acpi_handle handle;
535 union acpi_object *info;
536 struct amdgpu_atcs *atcs = &adev->atcs;
537 struct atcs_pref_req_input atcs_input;
538 struct atcs_pref_req_output atcs_output;
539 struct acpi_buffer params;
540 size_t size;
541 u32 retry = 3;
542
543 if (amdgpu_acpi_pcie_notify_device_ready(adev))
544 return -EINVAL;
545
546 /* Get the device handle */
547 handle = ACPI_HANDLE(&adev->pdev->dev);
548 if (!handle)
549 return -EINVAL;
550
551 if (!atcs->functions.pcie_perf_req)
552 return -EINVAL;
553
554 atcs_input.size = sizeof(struct atcs_pref_req_input);
555 /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
556 atcs_input.client_id = adev->pdev->devfn | (adev->pdev->bus->number << 8);
557 atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
558 atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
559 if (advertise)
560 atcs_input.flags |= ATCS_ADVERTISE_CAPS;
561 atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
562 atcs_input.perf_req = perf_req;
563
564 params.length = sizeof(struct atcs_pref_req_input);
565 params.pointer = &atcs_input;
566
567 while (retry--) {
568 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST, ¶ms);
569 if (!info)
570 return -EIO;
571
572 memset(&atcs_output, 0, sizeof(atcs_output));
573
574 size = *(u16 *) info->buffer.pointer;
575 if (size < 3) {
576 DRM_INFO("ATCS buffer is too small: %zu\n", size);
577 kfree(info);
578 return -EINVAL;
579 }
580 size = min(sizeof(atcs_output), size);
581
582 memcpy(&atcs_output, info->buffer.pointer, size);
583
584 kfree(info);
585
586 switch (atcs_output.ret_val) {
587 case ATCS_REQUEST_REFUSED:
588 default:
589 return -EINVAL;
590 case ATCS_REQUEST_COMPLETE:
591 return 0;
592 case ATCS_REQUEST_IN_PROGRESS:
593 udelay(10);
594 break;
595 }
596 }
597
598 return 0;
599}
600
601/**
602 * amdgpu_acpi_event - handle notify events
603 *
604 * @nb: notifier block
605 * @val: val
606 * @data: acpi event
607 *
608 * Calls relevant amdgpu functions in response to various
609 * acpi events.
610 * Returns NOTIFY code
611 */
612static int amdgpu_acpi_event(struct notifier_block *nb,
613 unsigned long val,
614 void *data)
615{
616 struct amdgpu_device *adev = container_of(nb, struct amdgpu_device, acpi_nb);
617 struct acpi_bus_event *entry = (struct acpi_bus_event *)data;
618
619 if (strcmp(entry->device_class, ACPI_AC_CLASS) == 0) {
620 if (power_supply_is_system_supplied() > 0)
621 DRM_DEBUG_DRIVER("pm: AC\n");
622 else
623 DRM_DEBUG_DRIVER("pm: DC\n");
624
625 amdgpu_pm_acpi_event_handler(adev);
626 }
627
628 /* Check for pending SBIOS requests */
629 return amdgpu_atif_handler(adev, entry);
630}
631
632/* Call all ACPI methods here */
633/**
634 * amdgpu_acpi_init - init driver acpi support
635 *
636 * @adev: amdgpu_device pointer
637 *
638 * Verifies the AMD ACPI interfaces and registers with the acpi
639 * notifier chain (all asics).
640 * Returns 0 on success, error on failure.
641 */
642int amdgpu_acpi_init(struct amdgpu_device *adev)
643{
644 acpi_handle handle;
645 struct amdgpu_atif *atif = &adev->atif;
646 struct amdgpu_atcs *atcs = &adev->atcs;
647 int ret;
648
649 /* Get the device handle */
650 handle = ACPI_HANDLE(&adev->pdev->dev);
651
652 if (!adev->bios || !handle)
653 return 0;
654
655 /* Call the ATCS method */
656 ret = amdgpu_atcs_verify_interface(handle, atcs);
657 if (ret) {
658 DRM_DEBUG_DRIVER("Call to ATCS verify_interface failed: %d\n", ret);
659 }
660
661 /* Call the ATIF method */
662 ret = amdgpu_atif_verify_interface(handle, atif);
663 if (ret) {
664 DRM_DEBUG_DRIVER("Call to ATIF verify_interface failed: %d\n", ret);
665 goto out;
666 }
667
668 if (atif->notifications.brightness_change) {
669 struct drm_encoder *tmp;
670
671 /* Find the encoder controlling the brightness */
672 list_for_each_entry(tmp, &adev->ddev->mode_config.encoder_list,
673 head) {
674 struct amdgpu_encoder *enc = to_amdgpu_encoder(tmp);
675
676 if ((enc->devices & (ATOM_DEVICE_LCD_SUPPORT)) &&
677 enc->enc_priv) {
678 struct amdgpu_encoder_atom_dig *dig = enc->enc_priv;
679 if (dig->bl_dev) {
680 atif->encoder_for_bl = enc;
681 break;
682 }
683 }
684 }
685 }
686
687 if (atif->functions.sbios_requests && !atif->functions.system_params) {
688 /* XXX check this workraround, if sbios request function is
689 * present we have to see how it's configured in the system
690 * params
691 */
692 atif->functions.system_params = true;
693 }
694
695 if (atif->functions.system_params) {
696 ret = amdgpu_atif_get_notification_params(handle,
697 &atif->notification_cfg);
698 if (ret) {
699 DRM_DEBUG_DRIVER("Call to GET_SYSTEM_PARAMS failed: %d\n",
700 ret);
701 /* Disable notification */
702 atif->notification_cfg.enabled = false;
703 }
704 }
705
706out:
707 adev->acpi_nb.notifier_call = amdgpu_acpi_event;
708 register_acpi_notifier(&adev->acpi_nb);
709
710 return ret;
711}
712
713/**
714 * amdgpu_acpi_fini - tear down driver acpi support
715 *
716 * @adev: amdgpu_device pointer
717 *
718 * Unregisters with the acpi notifier chain (all asics).
719 */
720void amdgpu_acpi_fini(struct amdgpu_device *adev)
721{
722 unregister_acpi_notifier(&adev->acpi_nb);
723}