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