Loading...
1/*
2 * Copyright 2012 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 */
23
24#include <linux/pci.h>
25#include <linux/acpi.h>
26#include <linux/slab.h>
27#include <linux/power_supply.h>
28#include <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 <linux/suspend.h>
30#include <acpi/video.h>
31#include <acpi/actbl.h>
32
33#include <drm/drm_crtc_helper.h>
34#include "amdgpu.h"
35#include "amdgpu_pm.h"
36#include "amdgpu_display.h"
37#include "amd_acpi.h"
38#include "atom.h"
39
40struct amdgpu_atif_notification_cfg {
41 bool enabled;
42 int command_code;
43};
44
45struct amdgpu_atif_notifications {
46 bool thermal_state;
47 bool forced_power_state;
48 bool system_power_state;
49 bool brightness_change;
50 bool dgpu_display_event;
51 bool gpu_package_power_limit;
52};
53
54struct amdgpu_atif_functions {
55 bool system_params;
56 bool sbios_requests;
57 bool temperature_change;
58 bool query_backlight_transfer_characteristics;
59 bool ready_to_undock;
60 bool external_gpu_information;
61};
62
63struct amdgpu_atif {
64 acpi_handle handle;
65
66 struct amdgpu_atif_notifications notifications;
67 struct amdgpu_atif_functions functions;
68 struct amdgpu_atif_notification_cfg notification_cfg;
69#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
70 struct backlight_device *bd;
71#endif
72 struct amdgpu_dm_backlight_caps backlight_caps;
73};
74
75struct amdgpu_atcs_functions {
76 bool get_ext_state;
77 bool pcie_perf_req;
78 bool pcie_dev_rdy;
79 bool pcie_bus_width;
80 bool power_shift_control;
81};
82
83struct amdgpu_atcs {
84 acpi_handle handle;
85
86 struct amdgpu_atcs_functions functions;
87};
88
89static struct amdgpu_acpi_priv {
90 struct amdgpu_atif atif;
91 struct amdgpu_atcs atcs;
92} amdgpu_acpi_priv;
93
94/* Call the ATIF method
95 */
96/**
97 * amdgpu_atif_call - call an ATIF method
98 *
99 * @atif: atif structure
100 * @function: the ATIF function to execute
101 * @params: ATIF function params
102 *
103 * Executes the requested ATIF function (all asics).
104 * Returns a pointer to the acpi output buffer.
105 */
106static union acpi_object *amdgpu_atif_call(struct amdgpu_atif *atif,
107 int function,
108 struct acpi_buffer *params)
109{
110 acpi_status status;
111 union acpi_object atif_arg_elements[2];
112 struct acpi_object_list atif_arg;
113 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
114
115 atif_arg.count = 2;
116 atif_arg.pointer = &atif_arg_elements[0];
117
118 atif_arg_elements[0].type = ACPI_TYPE_INTEGER;
119 atif_arg_elements[0].integer.value = function;
120
121 if (params) {
122 atif_arg_elements[1].type = ACPI_TYPE_BUFFER;
123 atif_arg_elements[1].buffer.length = params->length;
124 atif_arg_elements[1].buffer.pointer = params->pointer;
125 } else {
126 /* We need a second fake parameter */
127 atif_arg_elements[1].type = ACPI_TYPE_INTEGER;
128 atif_arg_elements[1].integer.value = 0;
129 }
130
131 status = acpi_evaluate_object(atif->handle, NULL, &atif_arg,
132 &buffer);
133
134 /* Fail only if calling the method fails and ATIF is supported */
135 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
136 DRM_DEBUG_DRIVER("failed to evaluate ATIF got %s\n",
137 acpi_format_exception(status));
138 kfree(buffer.pointer);
139 return NULL;
140 }
141
142 return buffer.pointer;
143}
144
145/**
146 * amdgpu_atif_parse_notification - parse supported notifications
147 *
148 * @n: supported notifications struct
149 * @mask: supported notifications mask from ATIF
150 *
151 * Use the supported notifications mask from ATIF function
152 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what notifications
153 * are supported (all asics).
154 */
155static void amdgpu_atif_parse_notification(struct amdgpu_atif_notifications *n, u32 mask)
156{
157 n->thermal_state = mask & ATIF_THERMAL_STATE_CHANGE_REQUEST_SUPPORTED;
158 n->forced_power_state = mask & ATIF_FORCED_POWER_STATE_CHANGE_REQUEST_SUPPORTED;
159 n->system_power_state = mask & ATIF_SYSTEM_POWER_SOURCE_CHANGE_REQUEST_SUPPORTED;
160 n->brightness_change = mask & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST_SUPPORTED;
161 n->dgpu_display_event = mask & ATIF_DGPU_DISPLAY_EVENT_SUPPORTED;
162 n->gpu_package_power_limit = mask & ATIF_GPU_PACKAGE_POWER_LIMIT_REQUEST_SUPPORTED;
163}
164
165/**
166 * amdgpu_atif_parse_functions - parse supported functions
167 *
168 * @f: supported functions struct
169 * @mask: supported functions mask from ATIF
170 *
171 * Use the supported functions mask from ATIF function
172 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what functions
173 * are supported (all asics).
174 */
175static void amdgpu_atif_parse_functions(struct amdgpu_atif_functions *f, u32 mask)
176{
177 f->system_params = mask & ATIF_GET_SYSTEM_PARAMETERS_SUPPORTED;
178 f->sbios_requests = mask & ATIF_GET_SYSTEM_BIOS_REQUESTS_SUPPORTED;
179 f->temperature_change = mask & ATIF_TEMPERATURE_CHANGE_NOTIFICATION_SUPPORTED;
180 f->query_backlight_transfer_characteristics =
181 mask & ATIF_QUERY_BACKLIGHT_TRANSFER_CHARACTERISTICS_SUPPORTED;
182 f->ready_to_undock = mask & ATIF_READY_TO_UNDOCK_NOTIFICATION_SUPPORTED;
183 f->external_gpu_information = mask & ATIF_GET_EXTERNAL_GPU_INFORMATION_SUPPORTED;
184}
185
186/**
187 * amdgpu_atif_verify_interface - verify ATIF
188 *
189 * @atif: amdgpu atif struct
190 *
191 * Execute the ATIF_FUNCTION_VERIFY_INTERFACE ATIF function
192 * to initialize ATIF and determine what features are supported
193 * (all asics).
194 * returns 0 on success, error on failure.
195 */
196static int amdgpu_atif_verify_interface(struct amdgpu_atif *atif)
197{
198 union acpi_object *info;
199 struct atif_verify_interface output;
200 size_t size;
201 int err = 0;
202
203 info = amdgpu_atif_call(atif, ATIF_FUNCTION_VERIFY_INTERFACE, NULL);
204 if (!info)
205 return -EIO;
206
207 memset(&output, 0, sizeof(output));
208
209 size = *(u16 *) info->buffer.pointer;
210 if (size < 12) {
211 DRM_INFO("ATIF buffer is too small: %zu\n", size);
212 err = -EINVAL;
213 goto out;
214 }
215 size = min(sizeof(output), size);
216
217 memcpy(&output, info->buffer.pointer, size);
218
219 /* TODO: check version? */
220 DRM_DEBUG_DRIVER("ATIF version %u\n", output.version);
221
222 amdgpu_atif_parse_notification(&atif->notifications, output.notification_mask);
223 amdgpu_atif_parse_functions(&atif->functions, output.function_bits);
224
225out:
226 kfree(info);
227 return err;
228}
229
230/**
231 * amdgpu_atif_get_notification_params - determine notify configuration
232 *
233 * @atif: acpi handle
234 *
235 * Execute the ATIF_FUNCTION_GET_SYSTEM_PARAMETERS ATIF function
236 * to determine if a notifier is used and if so which one
237 * (all asics). This is either Notify(VGA, 0x81) or Notify(VGA, n)
238 * where n is specified in the result if a notifier is used.
239 * Returns 0 on success, error on failure.
240 */
241static int amdgpu_atif_get_notification_params(struct amdgpu_atif *atif)
242{
243 union acpi_object *info;
244 struct amdgpu_atif_notification_cfg *n = &atif->notification_cfg;
245 struct atif_system_params params;
246 size_t size;
247 int err = 0;
248
249 info = amdgpu_atif_call(atif, ATIF_FUNCTION_GET_SYSTEM_PARAMETERS,
250 NULL);
251 if (!info) {
252 err = -EIO;
253 goto out;
254 }
255
256 size = *(u16 *) info->buffer.pointer;
257 if (size < 10) {
258 err = -EINVAL;
259 goto out;
260 }
261
262 memset(¶ms, 0, sizeof(params));
263 size = min(sizeof(params), size);
264 memcpy(¶ms, info->buffer.pointer, size);
265
266 DRM_DEBUG_DRIVER("SYSTEM_PARAMS: mask = %#x, flags = %#x\n",
267 params.flags, params.valid_mask);
268 params.flags = params.flags & params.valid_mask;
269
270 if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_NONE) {
271 n->enabled = false;
272 n->command_code = 0;
273 } else if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_81) {
274 n->enabled = true;
275 n->command_code = 0x81;
276 } else {
277 if (size < 11) {
278 err = -EINVAL;
279 goto out;
280 }
281 n->enabled = true;
282 n->command_code = params.command_code;
283 }
284
285out:
286 DRM_DEBUG_DRIVER("Notification %s, command code = %#x\n",
287 (n->enabled ? "enabled" : "disabled"),
288 n->command_code);
289 kfree(info);
290 return err;
291}
292
293/**
294 * amdgpu_atif_query_backlight_caps - get min and max backlight input signal
295 *
296 * @atif: acpi handle
297 *
298 * Execute the QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS ATIF function
299 * to determine the acceptable range of backlight values
300 *
301 * Backlight_caps.caps_valid will be set to true if the query is successful
302 *
303 * The input signals are in range 0-255
304 *
305 * This function assumes the display with backlight is the first LCD
306 *
307 * Returns 0 on success, error on failure.
308 */
309static int amdgpu_atif_query_backlight_caps(struct amdgpu_atif *atif)
310{
311 union acpi_object *info;
312 struct atif_qbtc_output characteristics;
313 struct atif_qbtc_arguments arguments;
314 struct acpi_buffer params;
315 size_t size;
316 int err = 0;
317
318 arguments.size = sizeof(arguments);
319 arguments.requested_display = ATIF_QBTC_REQUEST_LCD1;
320
321 params.length = sizeof(arguments);
322 params.pointer = (void *)&arguments;
323
324 info = amdgpu_atif_call(atif,
325 ATIF_FUNCTION_QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS,
326 ¶ms);
327 if (!info) {
328 err = -EIO;
329 goto out;
330 }
331
332 size = *(u16 *) info->buffer.pointer;
333 if (size < 10) {
334 err = -EINVAL;
335 goto out;
336 }
337
338 memset(&characteristics, 0, sizeof(characteristics));
339 size = min(sizeof(characteristics), size);
340 memcpy(&characteristics, info->buffer.pointer, size);
341
342 atif->backlight_caps.caps_valid = true;
343 atif->backlight_caps.min_input_signal =
344 characteristics.min_input_signal;
345 atif->backlight_caps.max_input_signal =
346 characteristics.max_input_signal;
347out:
348 kfree(info);
349 return err;
350}
351
352/**
353 * amdgpu_atif_get_sbios_requests - get requested sbios event
354 *
355 * @atif: acpi handle
356 * @req: atif sbios request struct
357 *
358 * Execute the ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS ATIF function
359 * to determine what requests the sbios is making to the driver
360 * (all asics).
361 * Returns 0 on success, error on failure.
362 */
363static int amdgpu_atif_get_sbios_requests(struct amdgpu_atif *atif,
364 struct atif_sbios_requests *req)
365{
366 union acpi_object *info;
367 size_t size;
368 int count = 0;
369
370 info = amdgpu_atif_call(atif, ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS,
371 NULL);
372 if (!info)
373 return -EIO;
374
375 size = *(u16 *)info->buffer.pointer;
376 if (size < 0xd) {
377 count = -EINVAL;
378 goto out;
379 }
380 memset(req, 0, sizeof(*req));
381
382 size = min(sizeof(*req), size);
383 memcpy(req, info->buffer.pointer, size);
384 DRM_DEBUG_DRIVER("SBIOS pending requests: %#x\n", req->pending);
385
386 count = hweight32(req->pending);
387
388out:
389 kfree(info);
390 return count;
391}
392
393/**
394 * amdgpu_atif_handler - handle ATIF notify requests
395 *
396 * @adev: amdgpu_device pointer
397 * @event: atif sbios request struct
398 *
399 * Checks the acpi event and if it matches an atif event,
400 * handles it.
401 *
402 * Returns:
403 * NOTIFY_BAD or NOTIFY_DONE, depending on the event.
404 */
405static int amdgpu_atif_handler(struct amdgpu_device *adev,
406 struct acpi_bus_event *event)
407{
408 struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
409 int count;
410
411 DRM_DEBUG_DRIVER("event, device_class = %s, type = %#x\n",
412 event->device_class, event->type);
413
414 if (strcmp(event->device_class, ACPI_VIDEO_CLASS) != 0)
415 return NOTIFY_DONE;
416
417 /* Is this actually our event? */
418 if (!atif->notification_cfg.enabled ||
419 event->type != atif->notification_cfg.command_code) {
420 /* These events will generate keypresses otherwise */
421 if (event->type == ACPI_VIDEO_NOTIFY_PROBE)
422 return NOTIFY_BAD;
423 else
424 return NOTIFY_DONE;
425 }
426
427 if (atif->functions.sbios_requests) {
428 struct atif_sbios_requests req;
429
430 /* Check pending SBIOS requests */
431 count = amdgpu_atif_get_sbios_requests(atif, &req);
432
433 if (count <= 0)
434 return NOTIFY_BAD;
435
436 DRM_DEBUG_DRIVER("ATIF: %d pending SBIOS requests\n", count);
437
438 if (req.pending & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST) {
439#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
440 if (atif->bd) {
441 DRM_DEBUG_DRIVER("Changing brightness to %d\n",
442 req.backlight_level);
443 /*
444 * XXX backlight_device_set_brightness() is
445 * hardwired to post BACKLIGHT_UPDATE_SYSFS.
446 * It probably should accept 'reason' parameter.
447 */
448 backlight_device_set_brightness(atif->bd, req.backlight_level);
449 }
450#endif
451 }
452
453 if (req.pending & ATIF_DGPU_DISPLAY_EVENT) {
454 if (adev->flags & AMD_IS_PX) {
455 pm_runtime_get_sync(adev_to_drm(adev)->dev);
456 /* Just fire off a uevent and let userspace tell us what to do */
457 drm_helper_hpd_irq_event(adev_to_drm(adev));
458 pm_runtime_mark_last_busy(adev_to_drm(adev)->dev);
459 pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
460 }
461 }
462 /* TODO: check other events */
463 }
464
465 /* We've handled the event, stop the notifier chain. The ACPI interface
466 * overloads ACPI_VIDEO_NOTIFY_PROBE, we don't want to send that to
467 * userspace if the event was generated only to signal a SBIOS
468 * request.
469 */
470 return NOTIFY_BAD;
471}
472
473/* Call the ATCS method
474 */
475/**
476 * amdgpu_atcs_call - call an ATCS method
477 *
478 * @atcs: atcs structure
479 * @function: the ATCS function to execute
480 * @params: ATCS function params
481 *
482 * Executes the requested ATCS function (all asics).
483 * Returns a pointer to the acpi output buffer.
484 */
485static union acpi_object *amdgpu_atcs_call(struct amdgpu_atcs *atcs,
486 int function,
487 struct acpi_buffer *params)
488{
489 acpi_status status;
490 union acpi_object atcs_arg_elements[2];
491 struct acpi_object_list atcs_arg;
492 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
493
494 atcs_arg.count = 2;
495 atcs_arg.pointer = &atcs_arg_elements[0];
496
497 atcs_arg_elements[0].type = ACPI_TYPE_INTEGER;
498 atcs_arg_elements[0].integer.value = function;
499
500 if (params) {
501 atcs_arg_elements[1].type = ACPI_TYPE_BUFFER;
502 atcs_arg_elements[1].buffer.length = params->length;
503 atcs_arg_elements[1].buffer.pointer = params->pointer;
504 } else {
505 /* We need a second fake parameter */
506 atcs_arg_elements[1].type = ACPI_TYPE_INTEGER;
507 atcs_arg_elements[1].integer.value = 0;
508 }
509
510 status = acpi_evaluate_object(atcs->handle, NULL, &atcs_arg, &buffer);
511
512 /* Fail only if calling the method fails and ATIF is supported */
513 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
514 DRM_DEBUG_DRIVER("failed to evaluate ATCS got %s\n",
515 acpi_format_exception(status));
516 kfree(buffer.pointer);
517 return NULL;
518 }
519
520 return buffer.pointer;
521}
522
523/**
524 * amdgpu_atcs_parse_functions - parse supported functions
525 *
526 * @f: supported functions struct
527 * @mask: supported functions mask from ATCS
528 *
529 * Use the supported functions mask from ATCS function
530 * ATCS_FUNCTION_VERIFY_INTERFACE to determine what functions
531 * are supported (all asics).
532 */
533static void amdgpu_atcs_parse_functions(struct amdgpu_atcs_functions *f, u32 mask)
534{
535 f->get_ext_state = mask & ATCS_GET_EXTERNAL_STATE_SUPPORTED;
536 f->pcie_perf_req = mask & ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED;
537 f->pcie_dev_rdy = mask & ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED;
538 f->pcie_bus_width = mask & ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED;
539 f->power_shift_control = mask & ATCS_SET_POWER_SHIFT_CONTROL_SUPPORTED;
540}
541
542/**
543 * amdgpu_atcs_verify_interface - verify ATCS
544 *
545 * @atcs: amdgpu atcs struct
546 *
547 * Execute the ATCS_FUNCTION_VERIFY_INTERFACE ATCS function
548 * to initialize ATCS and determine what features are supported
549 * (all asics).
550 * returns 0 on success, error on failure.
551 */
552static int amdgpu_atcs_verify_interface(struct amdgpu_atcs *atcs)
553{
554 union acpi_object *info;
555 struct atcs_verify_interface output;
556 size_t size;
557 int err = 0;
558
559 info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_VERIFY_INTERFACE, NULL);
560 if (!info)
561 return -EIO;
562
563 memset(&output, 0, sizeof(output));
564
565 size = *(u16 *) info->buffer.pointer;
566 if (size < 8) {
567 DRM_INFO("ATCS buffer is too small: %zu\n", size);
568 err = -EINVAL;
569 goto out;
570 }
571 size = min(sizeof(output), size);
572
573 memcpy(&output, info->buffer.pointer, size);
574
575 /* TODO: check version? */
576 DRM_DEBUG_DRIVER("ATCS version %u\n", output.version);
577
578 amdgpu_atcs_parse_functions(&atcs->functions, output.function_bits);
579
580out:
581 kfree(info);
582 return err;
583}
584
585/**
586 * amdgpu_acpi_is_pcie_performance_request_supported
587 *
588 * @adev: amdgpu_device pointer
589 *
590 * Check if the ATCS pcie_perf_req and pcie_dev_rdy methods
591 * are supported (all asics).
592 * returns true if supported, false if not.
593 */
594bool amdgpu_acpi_is_pcie_performance_request_supported(struct amdgpu_device *adev)
595{
596 struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
597
598 if (atcs->functions.pcie_perf_req && atcs->functions.pcie_dev_rdy)
599 return true;
600
601 return false;
602}
603
604/**
605 * amdgpu_acpi_is_power_shift_control_supported
606 *
607 * Check if the ATCS power shift control method
608 * is supported.
609 * returns true if supported, false if not.
610 */
611bool amdgpu_acpi_is_power_shift_control_supported(void)
612{
613 return amdgpu_acpi_priv.atcs.functions.power_shift_control;
614}
615
616/**
617 * amdgpu_acpi_pcie_notify_device_ready
618 *
619 * @adev: amdgpu_device pointer
620 *
621 * Executes the PCIE_DEVICE_READY_NOTIFICATION method
622 * (all asics).
623 * returns 0 on success, error on failure.
624 */
625int amdgpu_acpi_pcie_notify_device_ready(struct amdgpu_device *adev)
626{
627 union acpi_object *info;
628 struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
629
630 if (!atcs->functions.pcie_dev_rdy)
631 return -EINVAL;
632
633 info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION, NULL);
634 if (!info)
635 return -EIO;
636
637 kfree(info);
638
639 return 0;
640}
641
642/**
643 * amdgpu_acpi_pcie_performance_request
644 *
645 * @adev: amdgpu_device pointer
646 * @perf_req: requested perf level (pcie gen speed)
647 * @advertise: set advertise caps flag if set
648 *
649 * Executes the PCIE_PERFORMANCE_REQUEST method to
650 * change the pcie gen speed (all asics).
651 * returns 0 on success, error on failure.
652 */
653int amdgpu_acpi_pcie_performance_request(struct amdgpu_device *adev,
654 u8 perf_req, bool advertise)
655{
656 union acpi_object *info;
657 struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
658 struct atcs_pref_req_input atcs_input;
659 struct atcs_pref_req_output atcs_output;
660 struct acpi_buffer params;
661 size_t size;
662 u32 retry = 3;
663
664 if (amdgpu_acpi_pcie_notify_device_ready(adev))
665 return -EINVAL;
666
667 if (!atcs->functions.pcie_perf_req)
668 return -EINVAL;
669
670 atcs_input.size = sizeof(struct atcs_pref_req_input);
671 /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
672 atcs_input.client_id = adev->pdev->devfn | (adev->pdev->bus->number << 8);
673 atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
674 atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
675 if (advertise)
676 atcs_input.flags |= ATCS_ADVERTISE_CAPS;
677 atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
678 atcs_input.perf_req = perf_req;
679
680 params.length = sizeof(struct atcs_pref_req_input);
681 params.pointer = &atcs_input;
682
683 while (retry--) {
684 info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST, ¶ms);
685 if (!info)
686 return -EIO;
687
688 memset(&atcs_output, 0, sizeof(atcs_output));
689
690 size = *(u16 *) info->buffer.pointer;
691 if (size < 3) {
692 DRM_INFO("ATCS buffer is too small: %zu\n", size);
693 kfree(info);
694 return -EINVAL;
695 }
696 size = min(sizeof(atcs_output), size);
697
698 memcpy(&atcs_output, info->buffer.pointer, size);
699
700 kfree(info);
701
702 switch (atcs_output.ret_val) {
703 case ATCS_REQUEST_REFUSED:
704 default:
705 return -EINVAL;
706 case ATCS_REQUEST_COMPLETE:
707 return 0;
708 case ATCS_REQUEST_IN_PROGRESS:
709 udelay(10);
710 break;
711 }
712 }
713
714 return 0;
715}
716
717/**
718 * amdgpu_acpi_power_shift_control
719 *
720 * @adev: amdgpu_device pointer
721 * @dev_state: device acpi state
722 * @drv_state: driver state
723 *
724 * Executes the POWER_SHIFT_CONTROL method to
725 * communicate current dGPU device state and
726 * driver state to APU/SBIOS.
727 * returns 0 on success, error on failure.
728 */
729int amdgpu_acpi_power_shift_control(struct amdgpu_device *adev,
730 u8 dev_state, bool drv_state)
731{
732 union acpi_object *info;
733 struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
734 struct atcs_pwr_shift_input atcs_input;
735 struct acpi_buffer params;
736
737 if (!amdgpu_acpi_is_power_shift_control_supported())
738 return -EINVAL;
739
740 atcs_input.size = sizeof(struct atcs_pwr_shift_input);
741 /* dGPU id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
742 atcs_input.dgpu_id = adev->pdev->devfn | (adev->pdev->bus->number << 8);
743 atcs_input.dev_acpi_state = dev_state;
744 atcs_input.drv_state = drv_state;
745
746 params.length = sizeof(struct atcs_pwr_shift_input);
747 params.pointer = &atcs_input;
748
749 info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_POWER_SHIFT_CONTROL, ¶ms);
750 if (!info) {
751 DRM_ERROR("ATCS PSC update failed\n");
752 return -EIO;
753 }
754
755 return 0;
756}
757
758/**
759 * amdgpu_acpi_smart_shift_update - update dGPU device state to SBIOS
760 *
761 * @dev: drm_device pointer
762 * @ss_state: current smart shift event
763 *
764 * returns 0 on success,
765 * otherwise return error number.
766 */
767int amdgpu_acpi_smart_shift_update(struct drm_device *dev, enum amdgpu_ss ss_state)
768{
769 struct amdgpu_device *adev = drm_to_adev(dev);
770 int r;
771
772 if (!amdgpu_device_supports_smart_shift(dev))
773 return 0;
774
775 switch (ss_state) {
776 /* SBIOS trigger “stop”, “enable” and “start” at D0, Driver Operational.
777 * SBIOS trigger “stop” at D3, Driver Not Operational.
778 * SBIOS trigger “stop” and “disable” at D0, Driver NOT operational.
779 */
780 case AMDGPU_SS_DRV_LOAD:
781 r = amdgpu_acpi_power_shift_control(adev,
782 AMDGPU_ATCS_PSC_DEV_STATE_D0,
783 AMDGPU_ATCS_PSC_DRV_STATE_OPR);
784 break;
785 case AMDGPU_SS_DEV_D0:
786 r = amdgpu_acpi_power_shift_control(adev,
787 AMDGPU_ATCS_PSC_DEV_STATE_D0,
788 AMDGPU_ATCS_PSC_DRV_STATE_OPR);
789 break;
790 case AMDGPU_SS_DEV_D3:
791 r = amdgpu_acpi_power_shift_control(adev,
792 AMDGPU_ATCS_PSC_DEV_STATE_D3_HOT,
793 AMDGPU_ATCS_PSC_DRV_STATE_NOT_OPR);
794 break;
795 case AMDGPU_SS_DRV_UNLOAD:
796 r = amdgpu_acpi_power_shift_control(adev,
797 AMDGPU_ATCS_PSC_DEV_STATE_D0,
798 AMDGPU_ATCS_PSC_DRV_STATE_NOT_OPR);
799 break;
800 default:
801 return -EINVAL;
802 }
803
804 return r;
805}
806
807/**
808 * amdgpu_acpi_event - handle notify events
809 *
810 * @nb: notifier block
811 * @val: val
812 * @data: acpi event
813 *
814 * Calls relevant amdgpu functions in response to various
815 * acpi events.
816 * Returns NOTIFY code
817 */
818static int amdgpu_acpi_event(struct notifier_block *nb,
819 unsigned long val,
820 void *data)
821{
822 struct amdgpu_device *adev = container_of(nb, struct amdgpu_device, acpi_nb);
823 struct acpi_bus_event *entry = (struct acpi_bus_event *)data;
824
825 if (strcmp(entry->device_class, ACPI_AC_CLASS) == 0) {
826 if (power_supply_is_system_supplied() > 0)
827 DRM_DEBUG_DRIVER("pm: AC\n");
828 else
829 DRM_DEBUG_DRIVER("pm: DC\n");
830
831 amdgpu_pm_acpi_event_handler(adev);
832 }
833
834 /* Check for pending SBIOS requests */
835 return amdgpu_atif_handler(adev, entry);
836}
837
838/* Call all ACPI methods here */
839/**
840 * amdgpu_acpi_init - init driver acpi support
841 *
842 * @adev: amdgpu_device pointer
843 *
844 * Verifies the AMD ACPI interfaces and registers with the acpi
845 * notifier chain (all asics).
846 * Returns 0 on success, error on failure.
847 */
848int amdgpu_acpi_init(struct amdgpu_device *adev)
849{
850 struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
851
852#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
853 if (atif->notifications.brightness_change) {
854 if (amdgpu_device_has_dc_support(adev)) {
855#if defined(CONFIG_DRM_AMD_DC)
856 struct amdgpu_display_manager *dm = &adev->dm;
857 if (dm->backlight_dev)
858 atif->bd = dm->backlight_dev;
859#endif
860 } else {
861 struct drm_encoder *tmp;
862
863 /* Find the encoder controlling the brightness */
864 list_for_each_entry(tmp, &adev_to_drm(adev)->mode_config.encoder_list,
865 head) {
866 struct amdgpu_encoder *enc = to_amdgpu_encoder(tmp);
867
868 if ((enc->devices & (ATOM_DEVICE_LCD_SUPPORT)) &&
869 enc->enc_priv) {
870 struct amdgpu_encoder_atom_dig *dig = enc->enc_priv;
871 if (dig->bl_dev) {
872 atif->bd = dig->bl_dev;
873 break;
874 }
875 }
876 }
877 }
878 }
879#endif
880 adev->acpi_nb.notifier_call = amdgpu_acpi_event;
881 register_acpi_notifier(&adev->acpi_nb);
882
883 return 0;
884}
885
886void amdgpu_acpi_get_backlight_caps(struct amdgpu_dm_backlight_caps *caps)
887{
888 struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
889
890 caps->caps_valid = atif->backlight_caps.caps_valid;
891 caps->min_input_signal = atif->backlight_caps.min_input_signal;
892 caps->max_input_signal = atif->backlight_caps.max_input_signal;
893}
894
895/**
896 * amdgpu_acpi_fini - tear down driver acpi support
897 *
898 * @adev: amdgpu_device pointer
899 *
900 * Unregisters with the acpi notifier chain (all asics).
901 */
902void amdgpu_acpi_fini(struct amdgpu_device *adev)
903{
904 unregister_acpi_notifier(&adev->acpi_nb);
905}
906
907/**
908 * amdgpu_atif_pci_probe_handle - look up the ATIF handle
909 *
910 * @pdev: pci device
911 *
912 * Look up the ATIF handles (all asics).
913 * Returns true if the handle is found, false if not.
914 */
915static bool amdgpu_atif_pci_probe_handle(struct pci_dev *pdev)
916{
917 char acpi_method_name[255] = { 0 };
918 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
919 acpi_handle dhandle, atif_handle;
920 acpi_status status;
921 int ret;
922
923 dhandle = ACPI_HANDLE(&pdev->dev);
924 if (!dhandle)
925 return false;
926
927 status = acpi_get_handle(dhandle, "ATIF", &atif_handle);
928 if (ACPI_FAILURE(status)) {
929 return false;
930 }
931 amdgpu_acpi_priv.atif.handle = atif_handle;
932 acpi_get_name(amdgpu_acpi_priv.atif.handle, ACPI_FULL_PATHNAME, &buffer);
933 DRM_DEBUG_DRIVER("Found ATIF handle %s\n", acpi_method_name);
934 ret = amdgpu_atif_verify_interface(&amdgpu_acpi_priv.atif);
935 if (ret) {
936 amdgpu_acpi_priv.atif.handle = 0;
937 return false;
938 }
939 return true;
940}
941
942/**
943 * amdgpu_atcs_pci_probe_handle - look up the ATCS handle
944 *
945 * @pdev: pci device
946 *
947 * Look up the ATCS handles (all asics).
948 * Returns true if the handle is found, false if not.
949 */
950static bool amdgpu_atcs_pci_probe_handle(struct pci_dev *pdev)
951{
952 char acpi_method_name[255] = { 0 };
953 struct acpi_buffer buffer = { sizeof(acpi_method_name), acpi_method_name };
954 acpi_handle dhandle, atcs_handle;
955 acpi_status status;
956 int ret;
957
958 dhandle = ACPI_HANDLE(&pdev->dev);
959 if (!dhandle)
960 return false;
961
962 status = acpi_get_handle(dhandle, "ATCS", &atcs_handle);
963 if (ACPI_FAILURE(status)) {
964 return false;
965 }
966 amdgpu_acpi_priv.atcs.handle = atcs_handle;
967 acpi_get_name(amdgpu_acpi_priv.atcs.handle, ACPI_FULL_PATHNAME, &buffer);
968 DRM_DEBUG_DRIVER("Found ATCS handle %s\n", acpi_method_name);
969 ret = amdgpu_atcs_verify_interface(&amdgpu_acpi_priv.atcs);
970 if (ret) {
971 amdgpu_acpi_priv.atcs.handle = 0;
972 return false;
973 }
974 return true;
975}
976
977/*
978 * amdgpu_acpi_detect - detect ACPI ATIF/ATCS methods
979 *
980 * Check if we have the ATIF/ATCS methods and populate
981 * the structures in the driver.
982 */
983void amdgpu_acpi_detect(void)
984{
985 struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
986 struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
987 struct pci_dev *pdev = NULL;
988 int ret;
989
990 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
991 if (!atif->handle)
992 amdgpu_atif_pci_probe_handle(pdev);
993 if (!atcs->handle)
994 amdgpu_atcs_pci_probe_handle(pdev);
995 }
996
997 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
998 if (!atif->handle)
999 amdgpu_atif_pci_probe_handle(pdev);
1000 if (!atcs->handle)
1001 amdgpu_atcs_pci_probe_handle(pdev);
1002 }
1003
1004 if (atif->functions.sbios_requests && !atif->functions.system_params) {
1005 /* XXX check this workraround, if sbios request function is
1006 * present we have to see how it's configured in the system
1007 * params
1008 */
1009 atif->functions.system_params = true;
1010 }
1011
1012 if (atif->functions.system_params) {
1013 ret = amdgpu_atif_get_notification_params(atif);
1014 if (ret) {
1015 DRM_DEBUG_DRIVER("Call to GET_SYSTEM_PARAMS failed: %d\n",
1016 ret);
1017 /* Disable notification */
1018 atif->notification_cfg.enabled = false;
1019 }
1020 }
1021
1022 if (atif->functions.query_backlight_transfer_characteristics) {
1023 ret = amdgpu_atif_query_backlight_caps(atif);
1024 if (ret) {
1025 DRM_DEBUG_DRIVER("Call to QUERY_BACKLIGHT_TRANSFER_CHARACTERISTICS failed: %d\n",
1026 ret);
1027 atif->backlight_caps.caps_valid = false;
1028 }
1029 } else {
1030 atif->backlight_caps.caps_valid = false;
1031 }
1032}
1033
1034/**
1035 * amdgpu_acpi_is_s0ix_supported
1036 *
1037 * @adev: amdgpu_device_pointer
1038 *
1039 * returns true if supported, false if not.
1040 */
1041bool amdgpu_acpi_is_s0ix_supported(struct amdgpu_device *adev)
1042{
1043#if IS_ENABLED(CONFIG_AMD_PMC) && IS_ENABLED(CONFIG_SUSPEND)
1044 if (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0) {
1045 if (adev->flags & AMD_IS_APU)
1046 return pm_suspend_target_state == PM_SUSPEND_TO_IDLE;
1047 }
1048#endif
1049 return false;
1050}