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