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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 <acpi/video.h>
29#include <drm/drmP.h>
30#include <drm/drm_crtc_helper.h>
31#include "amdgpu.h"
32#include "amd_acpi.h"
33#include "atom.h"
34
35extern void amdgpu_pm_acpi_event_handler(struct amdgpu_device *adev);
36/* Call the ATIF method
37 */
38/**
39 * amdgpu_atif_call - call an ATIF method
40 *
41 * @handle: acpi handle
42 * @function: the ATIF function to execute
43 * @params: ATIF function params
44 *
45 * Executes the requested ATIF function (all asics).
46 * Returns a pointer to the acpi output buffer.
47 */
48static union acpi_object *amdgpu_atif_call(acpi_handle handle, int function,
49 struct acpi_buffer *params)
50{
51 acpi_status status;
52 union acpi_object atif_arg_elements[2];
53 struct acpi_object_list atif_arg;
54 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
55
56 atif_arg.count = 2;
57 atif_arg.pointer = &atif_arg_elements[0];
58
59 atif_arg_elements[0].type = ACPI_TYPE_INTEGER;
60 atif_arg_elements[0].integer.value = function;
61
62 if (params) {
63 atif_arg_elements[1].type = ACPI_TYPE_BUFFER;
64 atif_arg_elements[1].buffer.length = params->length;
65 atif_arg_elements[1].buffer.pointer = params->pointer;
66 } else {
67 /* We need a second fake parameter */
68 atif_arg_elements[1].type = ACPI_TYPE_INTEGER;
69 atif_arg_elements[1].integer.value = 0;
70 }
71
72 status = acpi_evaluate_object(handle, "ATIF", &atif_arg, &buffer);
73
74 /* Fail only if calling the method fails and ATIF is supported */
75 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
76 DRM_DEBUG_DRIVER("failed to evaluate ATIF got %s\n",
77 acpi_format_exception(status));
78 kfree(buffer.pointer);
79 return NULL;
80 }
81
82 return buffer.pointer;
83}
84
85/**
86 * amdgpu_atif_parse_notification - parse supported notifications
87 *
88 * @n: supported notifications struct
89 * @mask: supported notifications mask from ATIF
90 *
91 * Use the supported notifications mask from ATIF function
92 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what notifications
93 * are supported (all asics).
94 */
95static void amdgpu_atif_parse_notification(struct amdgpu_atif_notifications *n, u32 mask)
96{
97 n->display_switch = mask & ATIF_DISPLAY_SWITCH_REQUEST_SUPPORTED;
98 n->expansion_mode_change = mask & ATIF_EXPANSION_MODE_CHANGE_REQUEST_SUPPORTED;
99 n->thermal_state = mask & ATIF_THERMAL_STATE_CHANGE_REQUEST_SUPPORTED;
100 n->forced_power_state = mask & ATIF_FORCED_POWER_STATE_CHANGE_REQUEST_SUPPORTED;
101 n->system_power_state = mask & ATIF_SYSTEM_POWER_SOURCE_CHANGE_REQUEST_SUPPORTED;
102 n->display_conf_change = mask & ATIF_DISPLAY_CONF_CHANGE_REQUEST_SUPPORTED;
103 n->px_gfx_switch = mask & ATIF_PX_GFX_SWITCH_REQUEST_SUPPORTED;
104 n->brightness_change = mask & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST_SUPPORTED;
105 n->dgpu_display_event = mask & ATIF_DGPU_DISPLAY_EVENT_SUPPORTED;
106}
107
108/**
109 * amdgpu_atif_parse_functions - parse supported functions
110 *
111 * @f: supported functions struct
112 * @mask: supported functions mask from ATIF
113 *
114 * Use the supported functions mask from ATIF function
115 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what functions
116 * are supported (all asics).
117 */
118static void amdgpu_atif_parse_functions(struct amdgpu_atif_functions *f, u32 mask)
119{
120 f->system_params = mask & ATIF_GET_SYSTEM_PARAMETERS_SUPPORTED;
121 f->sbios_requests = mask & ATIF_GET_SYSTEM_BIOS_REQUESTS_SUPPORTED;
122 f->select_active_disp = mask & ATIF_SELECT_ACTIVE_DISPLAYS_SUPPORTED;
123 f->lid_state = mask & ATIF_GET_LID_STATE_SUPPORTED;
124 f->get_tv_standard = mask & ATIF_GET_TV_STANDARD_FROM_CMOS_SUPPORTED;
125 f->set_tv_standard = mask & ATIF_SET_TV_STANDARD_IN_CMOS_SUPPORTED;
126 f->get_panel_expansion_mode = mask & ATIF_GET_PANEL_EXPANSION_MODE_FROM_CMOS_SUPPORTED;
127 f->set_panel_expansion_mode = mask & ATIF_SET_PANEL_EXPANSION_MODE_IN_CMOS_SUPPORTED;
128 f->temperature_change = mask & ATIF_TEMPERATURE_CHANGE_NOTIFICATION_SUPPORTED;
129 f->graphics_device_types = mask & ATIF_GET_GRAPHICS_DEVICE_TYPES_SUPPORTED;
130}
131
132/**
133 * amdgpu_atif_verify_interface - verify ATIF
134 *
135 * @handle: acpi handle
136 * @atif: amdgpu atif struct
137 *
138 * Execute the ATIF_FUNCTION_VERIFY_INTERFACE ATIF function
139 * to initialize ATIF and determine what features are supported
140 * (all asics).
141 * returns 0 on success, error on failure.
142 */
143static int amdgpu_atif_verify_interface(acpi_handle handle,
144 struct amdgpu_atif *atif)
145{
146 union acpi_object *info;
147 struct atif_verify_interface output;
148 size_t size;
149 int err = 0;
150
151 info = amdgpu_atif_call(handle, ATIF_FUNCTION_VERIFY_INTERFACE, NULL);
152 if (!info)
153 return -EIO;
154
155 memset(&output, 0, sizeof(output));
156
157 size = *(u16 *) info->buffer.pointer;
158 if (size < 12) {
159 DRM_INFO("ATIF buffer is too small: %zu\n", size);
160 err = -EINVAL;
161 goto out;
162 }
163 size = min(sizeof(output), size);
164
165 memcpy(&output, info->buffer.pointer, size);
166
167 /* TODO: check version? */
168 DRM_DEBUG_DRIVER("ATIF version %u\n", output.version);
169
170 amdgpu_atif_parse_notification(&atif->notifications, output.notification_mask);
171 amdgpu_atif_parse_functions(&atif->functions, output.function_bits);
172
173out:
174 kfree(info);
175 return err;
176}
177
178/**
179 * amdgpu_atif_get_notification_params - determine notify configuration
180 *
181 * @handle: acpi handle
182 * @n: atif notification configuration struct
183 *
184 * Execute the ATIF_FUNCTION_GET_SYSTEM_PARAMETERS ATIF function
185 * to determine if a notifier is used and if so which one
186 * (all asics). This is either Notify(VGA, 0x81) or Notify(VGA, n)
187 * where n is specified in the result if a notifier is used.
188 * Returns 0 on success, error on failure.
189 */
190static int amdgpu_atif_get_notification_params(acpi_handle handle,
191 struct amdgpu_atif_notification_cfg *n)
192{
193 union acpi_object *info;
194 struct atif_system_params params;
195 size_t size;
196 int err = 0;
197
198 info = amdgpu_atif_call(handle, ATIF_FUNCTION_GET_SYSTEM_PARAMETERS, NULL);
199 if (!info) {
200 err = -EIO;
201 goto out;
202 }
203
204 size = *(u16 *) info->buffer.pointer;
205 if (size < 10) {
206 err = -EINVAL;
207 goto out;
208 }
209
210 memset(¶ms, 0, sizeof(params));
211 size = min(sizeof(params), size);
212 memcpy(¶ms, info->buffer.pointer, size);
213
214 DRM_DEBUG_DRIVER("SYSTEM_PARAMS: mask = %#x, flags = %#x\n",
215 params.flags, params.valid_mask);
216 params.flags = params.flags & params.valid_mask;
217
218 if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_NONE) {
219 n->enabled = false;
220 n->command_code = 0;
221 } else if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_81) {
222 n->enabled = true;
223 n->command_code = 0x81;
224 } else {
225 if (size < 11) {
226 err = -EINVAL;
227 goto out;
228 }
229 n->enabled = true;
230 n->command_code = params.command_code;
231 }
232
233out:
234 DRM_DEBUG_DRIVER("Notification %s, command code = %#x\n",
235 (n->enabled ? "enabled" : "disabled"),
236 n->command_code);
237 kfree(info);
238 return err;
239}
240
241/**
242 * amdgpu_atif_get_sbios_requests - get requested sbios event
243 *
244 * @handle: acpi handle
245 * @req: atif sbios request struct
246 *
247 * Execute the ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS ATIF function
248 * to determine what requests the sbios is making to the driver
249 * (all asics).
250 * Returns 0 on success, error on failure.
251 */
252static int amdgpu_atif_get_sbios_requests(acpi_handle handle,
253 struct atif_sbios_requests *req)
254{
255 union acpi_object *info;
256 size_t size;
257 int count = 0;
258
259 info = amdgpu_atif_call(handle, ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS, NULL);
260 if (!info)
261 return -EIO;
262
263 size = *(u16 *)info->buffer.pointer;
264 if (size < 0xd) {
265 count = -EINVAL;
266 goto out;
267 }
268 memset(req, 0, sizeof(*req));
269
270 size = min(sizeof(*req), size);
271 memcpy(req, info->buffer.pointer, size);
272 DRM_DEBUG_DRIVER("SBIOS pending requests: %#x\n", req->pending);
273
274 count = hweight32(req->pending);
275
276out:
277 kfree(info);
278 return count;
279}
280
281/**
282 * amdgpu_atif_handler - handle ATIF notify requests
283 *
284 * @adev: amdgpu_device pointer
285 * @event: atif sbios request struct
286 *
287 * Checks the acpi event and if it matches an atif event,
288 * handles it.
289 * Returns NOTIFY code
290 */
291int amdgpu_atif_handler(struct amdgpu_device *adev,
292 struct acpi_bus_event *event)
293{
294 struct amdgpu_atif *atif = &adev->atif;
295 struct atif_sbios_requests req;
296 acpi_handle handle;
297 int count;
298
299 DRM_DEBUG_DRIVER("event, device_class = %s, type = %#x\n",
300 event->device_class, event->type);
301
302 if (strcmp(event->device_class, ACPI_VIDEO_CLASS) != 0)
303 return NOTIFY_DONE;
304
305 if (!atif->notification_cfg.enabled ||
306 event->type != atif->notification_cfg.command_code)
307 /* Not our event */
308 return NOTIFY_DONE;
309
310 /* Check pending SBIOS requests */
311 handle = ACPI_HANDLE(&adev->pdev->dev);
312 count = amdgpu_atif_get_sbios_requests(handle, &req);
313
314 if (count <= 0)
315 return NOTIFY_DONE;
316
317 DRM_DEBUG_DRIVER("ATIF: %d pending SBIOS requests\n", count);
318
319 if (req.pending & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST) {
320 struct amdgpu_encoder *enc = atif->encoder_for_bl;
321
322 if (enc) {
323 struct amdgpu_encoder_atom_dig *dig = enc->enc_priv;
324
325 DRM_DEBUG_DRIVER("Changing brightness to %d\n",
326 req.backlight_level);
327
328 amdgpu_display_backlight_set_level(adev, enc, req.backlight_level);
329
330#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
331 backlight_force_update(dig->bl_dev,
332 BACKLIGHT_UPDATE_HOTKEY);
333#endif
334 }
335 }
336 /* TODO: check other events */
337
338 /* We've handled the event, stop the notifier chain. The ACPI interface
339 * overloads ACPI_VIDEO_NOTIFY_PROBE, we don't want to send that to
340 * userspace if the event was generated only to signal a SBIOS
341 * request.
342 */
343 return NOTIFY_BAD;
344}
345
346/* Call the ATCS method
347 */
348/**
349 * amdgpu_atcs_call - call an ATCS method
350 *
351 * @handle: acpi handle
352 * @function: the ATCS function to execute
353 * @params: ATCS function params
354 *
355 * Executes the requested ATCS function (all asics).
356 * Returns a pointer to the acpi output buffer.
357 */
358static union acpi_object *amdgpu_atcs_call(acpi_handle handle, int function,
359 struct acpi_buffer *params)
360{
361 acpi_status status;
362 union acpi_object atcs_arg_elements[2];
363 struct acpi_object_list atcs_arg;
364 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
365
366 atcs_arg.count = 2;
367 atcs_arg.pointer = &atcs_arg_elements[0];
368
369 atcs_arg_elements[0].type = ACPI_TYPE_INTEGER;
370 atcs_arg_elements[0].integer.value = function;
371
372 if (params) {
373 atcs_arg_elements[1].type = ACPI_TYPE_BUFFER;
374 atcs_arg_elements[1].buffer.length = params->length;
375 atcs_arg_elements[1].buffer.pointer = params->pointer;
376 } else {
377 /* We need a second fake parameter */
378 atcs_arg_elements[1].type = ACPI_TYPE_INTEGER;
379 atcs_arg_elements[1].integer.value = 0;
380 }
381
382 status = acpi_evaluate_object(handle, "ATCS", &atcs_arg, &buffer);
383
384 /* Fail only if calling the method fails and ATIF is supported */
385 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
386 DRM_DEBUG_DRIVER("failed to evaluate ATCS got %s\n",
387 acpi_format_exception(status));
388 kfree(buffer.pointer);
389 return NULL;
390 }
391
392 return buffer.pointer;
393}
394
395/**
396 * amdgpu_atcs_parse_functions - parse supported functions
397 *
398 * @f: supported functions struct
399 * @mask: supported functions mask from ATCS
400 *
401 * Use the supported functions mask from ATCS function
402 * ATCS_FUNCTION_VERIFY_INTERFACE to determine what functions
403 * are supported (all asics).
404 */
405static void amdgpu_atcs_parse_functions(struct amdgpu_atcs_functions *f, u32 mask)
406{
407 f->get_ext_state = mask & ATCS_GET_EXTERNAL_STATE_SUPPORTED;
408 f->pcie_perf_req = mask & ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED;
409 f->pcie_dev_rdy = mask & ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED;
410 f->pcie_bus_width = mask & ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED;
411}
412
413/**
414 * amdgpu_atcs_verify_interface - verify ATCS
415 *
416 * @handle: acpi handle
417 * @atcs: amdgpu atcs struct
418 *
419 * Execute the ATCS_FUNCTION_VERIFY_INTERFACE ATCS function
420 * to initialize ATCS and determine what features are supported
421 * (all asics).
422 * returns 0 on success, error on failure.
423 */
424static int amdgpu_atcs_verify_interface(acpi_handle handle,
425 struct amdgpu_atcs *atcs)
426{
427 union acpi_object *info;
428 struct atcs_verify_interface output;
429 size_t size;
430 int err = 0;
431
432 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_VERIFY_INTERFACE, NULL);
433 if (!info)
434 return -EIO;
435
436 memset(&output, 0, sizeof(output));
437
438 size = *(u16 *) info->buffer.pointer;
439 if (size < 8) {
440 DRM_INFO("ATCS buffer is too small: %zu\n", size);
441 err = -EINVAL;
442 goto out;
443 }
444 size = min(sizeof(output), size);
445
446 memcpy(&output, info->buffer.pointer, size);
447
448 /* TODO: check version? */
449 DRM_DEBUG_DRIVER("ATCS version %u\n", output.version);
450
451 amdgpu_atcs_parse_functions(&atcs->functions, output.function_bits);
452
453out:
454 kfree(info);
455 return err;
456}
457
458/**
459 * amdgpu_acpi_is_pcie_performance_request_supported
460 *
461 * @adev: amdgpu_device pointer
462 *
463 * Check if the ATCS pcie_perf_req and pcie_dev_rdy methods
464 * are supported (all asics).
465 * returns true if supported, false if not.
466 */
467bool amdgpu_acpi_is_pcie_performance_request_supported(struct amdgpu_device *adev)
468{
469 struct amdgpu_atcs *atcs = &adev->atcs;
470
471 if (atcs->functions.pcie_perf_req && atcs->functions.pcie_dev_rdy)
472 return true;
473
474 return false;
475}
476
477/**
478 * amdgpu_acpi_pcie_notify_device_ready
479 *
480 * @adev: amdgpu_device pointer
481 *
482 * Executes the PCIE_DEVICE_READY_NOTIFICATION method
483 * (all asics).
484 * returns 0 on success, error on failure.
485 */
486int amdgpu_acpi_pcie_notify_device_ready(struct amdgpu_device *adev)
487{
488 acpi_handle handle;
489 union acpi_object *info;
490 struct amdgpu_atcs *atcs = &adev->atcs;
491
492 /* Get the device handle */
493 handle = ACPI_HANDLE(&adev->pdev->dev);
494 if (!handle)
495 return -EINVAL;
496
497 if (!atcs->functions.pcie_dev_rdy)
498 return -EINVAL;
499
500 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION, NULL);
501 if (!info)
502 return -EIO;
503
504 kfree(info);
505
506 return 0;
507}
508
509/**
510 * amdgpu_acpi_pcie_performance_request
511 *
512 * @adev: amdgpu_device pointer
513 * @perf_req: requested perf level (pcie gen speed)
514 * @advertise: set advertise caps flag if set
515 *
516 * Executes the PCIE_PERFORMANCE_REQUEST method to
517 * change the pcie gen speed (all asics).
518 * returns 0 on success, error on failure.
519 */
520int amdgpu_acpi_pcie_performance_request(struct amdgpu_device *adev,
521 u8 perf_req, bool advertise)
522{
523 acpi_handle handle;
524 union acpi_object *info;
525 struct amdgpu_atcs *atcs = &adev->atcs;
526 struct atcs_pref_req_input atcs_input;
527 struct atcs_pref_req_output atcs_output;
528 struct acpi_buffer params;
529 size_t size;
530 u32 retry = 3;
531
532 /* Get the device handle */
533 handle = ACPI_HANDLE(&adev->pdev->dev);
534 if (!handle)
535 return -EINVAL;
536
537 if (!atcs->functions.pcie_perf_req)
538 return -EINVAL;
539
540 atcs_input.size = sizeof(struct atcs_pref_req_input);
541 /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
542 atcs_input.client_id = adev->pdev->devfn | (adev->pdev->bus->number << 8);
543 atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
544 atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
545 if (advertise)
546 atcs_input.flags |= ATCS_ADVERTISE_CAPS;
547 atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
548 atcs_input.perf_req = perf_req;
549
550 params.length = sizeof(struct atcs_pref_req_input);
551 params.pointer = &atcs_input;
552
553 while (retry--) {
554 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST, ¶ms);
555 if (!info)
556 return -EIO;
557
558 memset(&atcs_output, 0, sizeof(atcs_output));
559
560 size = *(u16 *) info->buffer.pointer;
561 if (size < 3) {
562 DRM_INFO("ATCS buffer is too small: %zu\n", size);
563 kfree(info);
564 return -EINVAL;
565 }
566 size = min(sizeof(atcs_output), size);
567
568 memcpy(&atcs_output, info->buffer.pointer, size);
569
570 kfree(info);
571
572 switch (atcs_output.ret_val) {
573 case ATCS_REQUEST_REFUSED:
574 default:
575 return -EINVAL;
576 case ATCS_REQUEST_COMPLETE:
577 return 0;
578 case ATCS_REQUEST_IN_PROGRESS:
579 udelay(10);
580 break;
581 }
582 }
583
584 return 0;
585}
586
587/**
588 * amdgpu_acpi_event - handle notify events
589 *
590 * @nb: notifier block
591 * @val: val
592 * @data: acpi event
593 *
594 * Calls relevant amdgpu functions in response to various
595 * acpi events.
596 * Returns NOTIFY code
597 */
598static int amdgpu_acpi_event(struct notifier_block *nb,
599 unsigned long val,
600 void *data)
601{
602 struct amdgpu_device *adev = container_of(nb, struct amdgpu_device, acpi_nb);
603 struct acpi_bus_event *entry = (struct acpi_bus_event *)data;
604
605 if (strcmp(entry->device_class, ACPI_AC_CLASS) == 0) {
606 if (power_supply_is_system_supplied() > 0)
607 DRM_DEBUG_DRIVER("pm: AC\n");
608 else
609 DRM_DEBUG_DRIVER("pm: DC\n");
610
611 amdgpu_pm_acpi_event_handler(adev);
612 }
613
614 /* Check for pending SBIOS requests */
615 return amdgpu_atif_handler(adev, entry);
616}
617
618/* Call all ACPI methods here */
619/**
620 * amdgpu_acpi_init - init driver acpi support
621 *
622 * @adev: amdgpu_device pointer
623 *
624 * Verifies the AMD ACPI interfaces and registers with the acpi
625 * notifier chain (all asics).
626 * Returns 0 on success, error on failure.
627 */
628int amdgpu_acpi_init(struct amdgpu_device *adev)
629{
630 acpi_handle handle;
631 struct amdgpu_atif *atif = &adev->atif;
632 struct amdgpu_atcs *atcs = &adev->atcs;
633 int ret;
634
635 /* Get the device handle */
636 handle = ACPI_HANDLE(&adev->pdev->dev);
637
638 if (!adev->bios || !handle)
639 return 0;
640
641 /* Call the ATCS method */
642 ret = amdgpu_atcs_verify_interface(handle, atcs);
643 if (ret) {
644 DRM_DEBUG_DRIVER("Call to ATCS verify_interface failed: %d\n", ret);
645 }
646
647 /* Call the ATIF method */
648 ret = amdgpu_atif_verify_interface(handle, atif);
649 if (ret) {
650 DRM_DEBUG_DRIVER("Call to ATIF verify_interface failed: %d\n", ret);
651 goto out;
652 }
653
654 if (atif->notifications.brightness_change) {
655 struct drm_encoder *tmp;
656
657 /* Find the encoder controlling the brightness */
658 list_for_each_entry(tmp, &adev->ddev->mode_config.encoder_list,
659 head) {
660 struct amdgpu_encoder *enc = to_amdgpu_encoder(tmp);
661
662 if ((enc->devices & (ATOM_DEVICE_LCD_SUPPORT)) &&
663 enc->enc_priv) {
664 if (adev->is_atom_bios) {
665 struct amdgpu_encoder_atom_dig *dig = enc->enc_priv;
666 if (dig->bl_dev) {
667 atif->encoder_for_bl = enc;
668 break;
669 }
670 }
671 }
672 }
673 }
674
675 if (atif->functions.sbios_requests && !atif->functions.system_params) {
676 /* XXX check this workraround, if sbios request function is
677 * present we have to see how it's configured in the system
678 * params
679 */
680 atif->functions.system_params = true;
681 }
682
683 if (atif->functions.system_params) {
684 ret = amdgpu_atif_get_notification_params(handle,
685 &atif->notification_cfg);
686 if (ret) {
687 DRM_DEBUG_DRIVER("Call to GET_SYSTEM_PARAMS failed: %d\n",
688 ret);
689 /* Disable notification */
690 atif->notification_cfg.enabled = false;
691 }
692 }
693
694out:
695 adev->acpi_nb.notifier_call = amdgpu_acpi_event;
696 register_acpi_notifier(&adev->acpi_nb);
697
698 return ret;
699}
700
701/**
702 * amdgpu_acpi_fini - tear down driver acpi support
703 *
704 * @adev: amdgpu_device pointer
705 *
706 * Unregisters with the acpi notifier chain (all asics).
707 */
708void amdgpu_acpi_fini(struct amdgpu_device *adev)
709{
710 unregister_acpi_notifier(&adev->acpi_nb);
711}
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}