2 * Copyright 2012 Advanced Micro Devices, Inc.
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:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
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.
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 <acpi/actbl.h>
32 #include <drm/drm_crtc_helper.h>
34 #include "amdgpu_pm.h"
35 #include "amdgpu_display.h"
39 struct amdgpu_atif_notification_cfg {
44 struct amdgpu_atif_notifications {
46 bool forced_power_state;
47 bool system_power_state;
48 bool brightness_change;
49 bool dgpu_display_event;
50 bool gpu_package_power_limit;
53 struct amdgpu_atif_functions {
56 bool temperature_change;
57 bool query_backlight_transfer_characteristics;
59 bool external_gpu_information;
65 struct amdgpu_atif_notifications notifications;
66 struct amdgpu_atif_functions functions;
67 struct amdgpu_atif_notification_cfg notification_cfg;
68 #if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
69 struct backlight_device *bd;
71 struct amdgpu_dm_backlight_caps backlight_caps;
74 /* Call the ATIF method
77 * amdgpu_atif_call - call an ATIF method
80 * @function: the ATIF function to execute
81 * @params: ATIF function params
83 * Executes the requested ATIF function (all asics).
84 * Returns a pointer to the acpi output buffer.
86 static union acpi_object *amdgpu_atif_call(struct amdgpu_atif *atif,
88 struct acpi_buffer *params)
91 union acpi_object atif_arg_elements[2];
92 struct acpi_object_list atif_arg;
93 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
96 atif_arg.pointer = &atif_arg_elements[0];
98 atif_arg_elements[0].type = ACPI_TYPE_INTEGER;
99 atif_arg_elements[0].integer.value = function;
102 atif_arg_elements[1].type = ACPI_TYPE_BUFFER;
103 atif_arg_elements[1].buffer.length = params->length;
104 atif_arg_elements[1].buffer.pointer = params->pointer;
106 /* We need a second fake parameter */
107 atif_arg_elements[1].type = ACPI_TYPE_INTEGER;
108 atif_arg_elements[1].integer.value = 0;
111 status = acpi_evaluate_object(atif->handle, NULL, &atif_arg,
114 /* Fail only if calling the method fails and ATIF is supported */
115 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
116 DRM_DEBUG_DRIVER("failed to evaluate ATIF got %s\n",
117 acpi_format_exception(status));
118 kfree(buffer.pointer);
122 return buffer.pointer;
126 * amdgpu_atif_parse_notification - parse supported notifications
128 * @n: supported notifications struct
129 * @mask: supported notifications mask from ATIF
131 * Use the supported notifications mask from ATIF function
132 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what notifications
133 * are supported (all asics).
135 static void amdgpu_atif_parse_notification(struct amdgpu_atif_notifications *n, u32 mask)
137 n->thermal_state = mask & ATIF_THERMAL_STATE_CHANGE_REQUEST_SUPPORTED;
138 n->forced_power_state = mask & ATIF_FORCED_POWER_STATE_CHANGE_REQUEST_SUPPORTED;
139 n->system_power_state = mask & ATIF_SYSTEM_POWER_SOURCE_CHANGE_REQUEST_SUPPORTED;
140 n->brightness_change = mask & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST_SUPPORTED;
141 n->dgpu_display_event = mask & ATIF_DGPU_DISPLAY_EVENT_SUPPORTED;
142 n->gpu_package_power_limit = mask & ATIF_GPU_PACKAGE_POWER_LIMIT_REQUEST_SUPPORTED;
146 * amdgpu_atif_parse_functions - parse supported functions
148 * @f: supported functions struct
149 * @mask: supported functions mask from ATIF
151 * Use the supported functions mask from ATIF function
152 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what functions
153 * are supported (all asics).
155 static void amdgpu_atif_parse_functions(struct amdgpu_atif_functions *f, u32 mask)
157 f->system_params = mask & ATIF_GET_SYSTEM_PARAMETERS_SUPPORTED;
158 f->sbios_requests = mask & ATIF_GET_SYSTEM_BIOS_REQUESTS_SUPPORTED;
159 f->temperature_change = mask & ATIF_TEMPERATURE_CHANGE_NOTIFICATION_SUPPORTED;
160 f->query_backlight_transfer_characteristics =
161 mask & ATIF_QUERY_BACKLIGHT_TRANSFER_CHARACTERISTICS_SUPPORTED;
162 f->ready_to_undock = mask & ATIF_READY_TO_UNDOCK_NOTIFICATION_SUPPORTED;
163 f->external_gpu_information = mask & ATIF_GET_EXTERNAL_GPU_INFORMATION_SUPPORTED;
167 * amdgpu_atif_verify_interface - verify ATIF
169 * @atif: amdgpu atif struct
171 * Execute the ATIF_FUNCTION_VERIFY_INTERFACE ATIF function
172 * to initialize ATIF and determine what features are supported
174 * returns 0 on success, error on failure.
176 static int amdgpu_atif_verify_interface(struct amdgpu_atif *atif)
178 union acpi_object *info;
179 struct atif_verify_interface output;
183 info = amdgpu_atif_call(atif, ATIF_FUNCTION_VERIFY_INTERFACE, NULL);
187 memset(&output, 0, sizeof(output));
189 size = *(u16 *) info->buffer.pointer;
191 DRM_INFO("ATIF buffer is too small: %zu\n", size);
195 size = min(sizeof(output), size);
197 memcpy(&output, info->buffer.pointer, size);
199 /* TODO: check version? */
200 DRM_DEBUG_DRIVER("ATIF version %u\n", output.version);
202 amdgpu_atif_parse_notification(&atif->notifications, output.notification_mask);
203 amdgpu_atif_parse_functions(&atif->functions, output.function_bits);
210 static acpi_handle amdgpu_atif_probe_handle(acpi_handle dhandle)
212 acpi_handle handle = NULL;
213 char acpi_method_name[255] = { 0 };
214 struct acpi_buffer buffer = { sizeof(acpi_method_name), acpi_method_name };
217 /* For PX/HG systems, ATIF and ATPX are in the iGPU's namespace, on dGPU only
218 * systems, ATIF is in the dGPU's namespace.
220 status = acpi_get_handle(dhandle, "ATIF", &handle);
221 if (ACPI_SUCCESS(status))
224 if (amdgpu_has_atpx()) {
225 status = acpi_get_handle(amdgpu_atpx_get_dhandle(), "ATIF",
227 if (ACPI_SUCCESS(status))
231 DRM_DEBUG_DRIVER("No ATIF handle found\n");
234 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
235 DRM_DEBUG_DRIVER("Found ATIF handle %s\n", acpi_method_name);
240 * amdgpu_atif_get_notification_params - determine notify configuration
244 * Execute the ATIF_FUNCTION_GET_SYSTEM_PARAMETERS ATIF function
245 * to determine if a notifier is used and if so which one
246 * (all asics). This is either Notify(VGA, 0x81) or Notify(VGA, n)
247 * where n is specified in the result if a notifier is used.
248 * Returns 0 on success, error on failure.
250 static int amdgpu_atif_get_notification_params(struct amdgpu_atif *atif)
252 union acpi_object *info;
253 struct amdgpu_atif_notification_cfg *n = &atif->notification_cfg;
254 struct atif_system_params params;
258 info = amdgpu_atif_call(atif, ATIF_FUNCTION_GET_SYSTEM_PARAMETERS,
265 size = *(u16 *) info->buffer.pointer;
271 memset(¶ms, 0, sizeof(params));
272 size = min(sizeof(params), size);
273 memcpy(¶ms, info->buffer.pointer, size);
275 DRM_DEBUG_DRIVER("SYSTEM_PARAMS: mask = %#x, flags = %#x\n",
276 params.flags, params.valid_mask);
277 params.flags = params.flags & params.valid_mask;
279 if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_NONE) {
282 } else if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_81) {
284 n->command_code = 0x81;
291 n->command_code = params.command_code;
295 DRM_DEBUG_DRIVER("Notification %s, command code = %#x\n",
296 (n->enabled ? "enabled" : "disabled"),
303 * amdgpu_atif_query_backlight_caps - get min and max backlight input signal
307 * Execute the QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS ATIF function
308 * to determine the acceptable range of backlight values
310 * Backlight_caps.caps_valid will be set to true if the query is successful
312 * The input signals are in range 0-255
314 * This function assumes the display with backlight is the first LCD
316 * Returns 0 on success, error on failure.
318 static int amdgpu_atif_query_backlight_caps(struct amdgpu_atif *atif)
320 union acpi_object *info;
321 struct atif_qbtc_output characteristics;
322 struct atif_qbtc_arguments arguments;
323 struct acpi_buffer params;
327 arguments.size = sizeof(arguments);
328 arguments.requested_display = ATIF_QBTC_REQUEST_LCD1;
330 params.length = sizeof(arguments);
331 params.pointer = (void *)&arguments;
333 info = amdgpu_atif_call(atif,
334 ATIF_FUNCTION_QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS,
341 size = *(u16 *) info->buffer.pointer;
347 memset(&characteristics, 0, sizeof(characteristics));
348 size = min(sizeof(characteristics), size);
349 memcpy(&characteristics, info->buffer.pointer, size);
351 atif->backlight_caps.caps_valid = true;
352 atif->backlight_caps.min_input_signal =
353 characteristics.min_input_signal;
354 atif->backlight_caps.max_input_signal =
355 characteristics.max_input_signal;
362 * amdgpu_atif_get_sbios_requests - get requested sbios event
365 * @req: atif sbios request struct
367 * Execute the ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS ATIF function
368 * to determine what requests the sbios is making to the driver
370 * Returns 0 on success, error on failure.
372 static int amdgpu_atif_get_sbios_requests(struct amdgpu_atif *atif,
373 struct atif_sbios_requests *req)
375 union acpi_object *info;
379 info = amdgpu_atif_call(atif, ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS,
384 size = *(u16 *)info->buffer.pointer;
389 memset(req, 0, sizeof(*req));
391 size = min(sizeof(*req), size);
392 memcpy(req, info->buffer.pointer, size);
393 DRM_DEBUG_DRIVER("SBIOS pending requests: %#x\n", req->pending);
395 count = hweight32(req->pending);
403 * amdgpu_atif_handler - handle ATIF notify requests
405 * @adev: amdgpu_device pointer
406 * @event: atif sbios request struct
408 * Checks the acpi event and if it matches an atif event,
412 * NOTIFY_BAD or NOTIFY_DONE, depending on the event.
414 static int amdgpu_atif_handler(struct amdgpu_device *adev,
415 struct acpi_bus_event *event)
417 struct amdgpu_atif *atif = adev->atif;
420 DRM_DEBUG_DRIVER("event, device_class = %s, type = %#x\n",
421 event->device_class, event->type);
423 if (strcmp(event->device_class, ACPI_VIDEO_CLASS) != 0)
426 /* Is this actually our event? */
428 !atif->notification_cfg.enabled ||
429 event->type != atif->notification_cfg.command_code) {
430 /* These events will generate keypresses otherwise */
431 if (event->type == ACPI_VIDEO_NOTIFY_PROBE)
437 if (atif->functions.sbios_requests) {
438 struct atif_sbios_requests req;
440 /* Check pending SBIOS requests */
441 count = amdgpu_atif_get_sbios_requests(atif, &req);
446 DRM_DEBUG_DRIVER("ATIF: %d pending SBIOS requests\n", count);
448 if (req.pending & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST) {
449 #if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
451 DRM_DEBUG_DRIVER("Changing brightness to %d\n",
452 req.backlight_level);
454 * XXX backlight_device_set_brightness() is
455 * hardwired to post BACKLIGHT_UPDATE_SYSFS.
456 * It probably should accept 'reason' parameter.
458 backlight_device_set_brightness(atif->bd, req.backlight_level);
463 if (req.pending & ATIF_DGPU_DISPLAY_EVENT) {
464 if (adev->flags & AMD_IS_PX) {
465 pm_runtime_get_sync(adev_to_drm(adev)->dev);
466 /* Just fire off a uevent and let userspace tell us what to do */
467 drm_helper_hpd_irq_event(adev_to_drm(adev));
468 pm_runtime_mark_last_busy(adev_to_drm(adev)->dev);
469 pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
472 /* TODO: check other events */
475 /* We've handled the event, stop the notifier chain. The ACPI interface
476 * overloads ACPI_VIDEO_NOTIFY_PROBE, we don't want to send that to
477 * userspace if the event was generated only to signal a SBIOS
483 /* Call the ATCS method
486 * amdgpu_atcs_call - call an ATCS method
488 * @handle: acpi handle
489 * @function: the ATCS function to execute
490 * @params: ATCS function params
492 * Executes the requested ATCS function (all asics).
493 * Returns a pointer to the acpi output buffer.
495 static union acpi_object *amdgpu_atcs_call(acpi_handle handle, int function,
496 struct acpi_buffer *params)
499 union acpi_object atcs_arg_elements[2];
500 struct acpi_object_list atcs_arg;
501 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
504 atcs_arg.pointer = &atcs_arg_elements[0];
506 atcs_arg_elements[0].type = ACPI_TYPE_INTEGER;
507 atcs_arg_elements[0].integer.value = function;
510 atcs_arg_elements[1].type = ACPI_TYPE_BUFFER;
511 atcs_arg_elements[1].buffer.length = params->length;
512 atcs_arg_elements[1].buffer.pointer = params->pointer;
514 /* We need a second fake parameter */
515 atcs_arg_elements[1].type = ACPI_TYPE_INTEGER;
516 atcs_arg_elements[1].integer.value = 0;
519 status = acpi_evaluate_object(handle, "ATCS", &atcs_arg, &buffer);
521 /* Fail only if calling the method fails and ATIF is supported */
522 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
523 DRM_DEBUG_DRIVER("failed to evaluate ATCS got %s\n",
524 acpi_format_exception(status));
525 kfree(buffer.pointer);
529 return buffer.pointer;
533 * amdgpu_atcs_parse_functions - parse supported functions
535 * @f: supported functions struct
536 * @mask: supported functions mask from ATCS
538 * Use the supported functions mask from ATCS function
539 * ATCS_FUNCTION_VERIFY_INTERFACE to determine what functions
540 * are supported (all asics).
542 static void amdgpu_atcs_parse_functions(struct amdgpu_atcs_functions *f, u32 mask)
544 f->get_ext_state = mask & ATCS_GET_EXTERNAL_STATE_SUPPORTED;
545 f->pcie_perf_req = mask & ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED;
546 f->pcie_dev_rdy = mask & ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED;
547 f->pcie_bus_width = mask & ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED;
551 * amdgpu_atcs_verify_interface - verify ATCS
553 * @handle: acpi handle
554 * @atcs: amdgpu atcs struct
556 * Execute the ATCS_FUNCTION_VERIFY_INTERFACE ATCS function
557 * to initialize ATCS and determine what features are supported
559 * returns 0 on success, error on failure.
561 static int amdgpu_atcs_verify_interface(acpi_handle handle,
562 struct amdgpu_atcs *atcs)
564 union acpi_object *info;
565 struct atcs_verify_interface output;
569 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_VERIFY_INTERFACE, NULL);
573 memset(&output, 0, sizeof(output));
575 size = *(u16 *) info->buffer.pointer;
577 DRM_INFO("ATCS buffer is too small: %zu\n", size);
581 size = min(sizeof(output), size);
583 memcpy(&output, info->buffer.pointer, size);
585 /* TODO: check version? */
586 DRM_DEBUG_DRIVER("ATCS version %u\n", output.version);
588 amdgpu_atcs_parse_functions(&atcs->functions, output.function_bits);
596 * amdgpu_acpi_is_pcie_performance_request_supported
598 * @adev: amdgpu_device pointer
600 * Check if the ATCS pcie_perf_req and pcie_dev_rdy methods
601 * are supported (all asics).
602 * returns true if supported, false if not.
604 bool amdgpu_acpi_is_pcie_performance_request_supported(struct amdgpu_device *adev)
606 struct amdgpu_atcs *atcs = &adev->atcs;
608 if (atcs->functions.pcie_perf_req && atcs->functions.pcie_dev_rdy)
615 * amdgpu_acpi_pcie_notify_device_ready
617 * @adev: amdgpu_device pointer
619 * Executes the PCIE_DEVICE_READY_NOTIFICATION method
621 * returns 0 on success, error on failure.
623 int amdgpu_acpi_pcie_notify_device_ready(struct amdgpu_device *adev)
626 union acpi_object *info;
627 struct amdgpu_atcs *atcs = &adev->atcs;
629 /* Get the device handle */
630 handle = ACPI_HANDLE(&adev->pdev->dev);
634 if (!atcs->functions.pcie_dev_rdy)
637 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION, NULL);
647 * amdgpu_acpi_pcie_performance_request
649 * @adev: amdgpu_device pointer
650 * @perf_req: requested perf level (pcie gen speed)
651 * @advertise: set advertise caps flag if set
653 * Executes the PCIE_PERFORMANCE_REQUEST method to
654 * change the pcie gen speed (all asics).
655 * returns 0 on success, error on failure.
657 int amdgpu_acpi_pcie_performance_request(struct amdgpu_device *adev,
658 u8 perf_req, bool advertise)
661 union acpi_object *info;
662 struct amdgpu_atcs *atcs = &adev->atcs;
663 struct atcs_pref_req_input atcs_input;
664 struct atcs_pref_req_output atcs_output;
665 struct acpi_buffer params;
669 if (amdgpu_acpi_pcie_notify_device_ready(adev))
672 /* Get the device handle */
673 handle = ACPI_HANDLE(&adev->pdev->dev);
677 if (!atcs->functions.pcie_perf_req)
680 atcs_input.size = sizeof(struct atcs_pref_req_input);
681 /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
682 atcs_input.client_id = adev->pdev->devfn | (adev->pdev->bus->number << 8);
683 atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
684 atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
686 atcs_input.flags |= ATCS_ADVERTISE_CAPS;
687 atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
688 atcs_input.perf_req = perf_req;
690 params.length = sizeof(struct atcs_pref_req_input);
691 params.pointer = &atcs_input;
694 info = amdgpu_atcs_call(handle, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST, ¶ms);
698 memset(&atcs_output, 0, sizeof(atcs_output));
700 size = *(u16 *) info->buffer.pointer;
702 DRM_INFO("ATCS buffer is too small: %zu\n", size);
706 size = min(sizeof(atcs_output), size);
708 memcpy(&atcs_output, info->buffer.pointer, size);
712 switch (atcs_output.ret_val) {
713 case ATCS_REQUEST_REFUSED:
716 case ATCS_REQUEST_COMPLETE:
718 case ATCS_REQUEST_IN_PROGRESS:
728 * amdgpu_acpi_event - handle notify events
730 * @nb: notifier block
734 * Calls relevant amdgpu functions in response to various
736 * Returns NOTIFY code
738 static int amdgpu_acpi_event(struct notifier_block *nb,
742 struct amdgpu_device *adev = container_of(nb, struct amdgpu_device, acpi_nb);
743 struct acpi_bus_event *entry = (struct acpi_bus_event *)data;
745 if (strcmp(entry->device_class, ACPI_AC_CLASS) == 0) {
746 if (power_supply_is_system_supplied() > 0)
747 DRM_DEBUG_DRIVER("pm: AC\n");
749 DRM_DEBUG_DRIVER("pm: DC\n");
751 amdgpu_pm_acpi_event_handler(adev);
754 /* Check for pending SBIOS requests */
755 return amdgpu_atif_handler(adev, entry);
758 /* Call all ACPI methods here */
760 * amdgpu_acpi_init - init driver acpi support
762 * @adev: amdgpu_device pointer
764 * Verifies the AMD ACPI interfaces and registers with the acpi
765 * notifier chain (all asics).
766 * Returns 0 on success, error on failure.
768 int amdgpu_acpi_init(struct amdgpu_device *adev)
770 acpi_handle handle, atif_handle;
771 struct amdgpu_atif *atif;
772 struct amdgpu_atcs *atcs = &adev->atcs;
775 /* Get the device handle */
776 handle = ACPI_HANDLE(&adev->pdev->dev);
778 if (!adev->bios || !handle)
781 /* Call the ATCS method */
782 ret = amdgpu_atcs_verify_interface(handle, atcs);
784 DRM_DEBUG_DRIVER("Call to ATCS verify_interface failed: %d\n", ret);
787 /* Probe for ATIF, and initialize it if found */
788 atif_handle = amdgpu_atif_probe_handle(handle);
792 atif = kzalloc(sizeof(*atif), GFP_KERNEL);
794 DRM_WARN("Not enough memory to initialize ATIF\n");
797 atif->handle = atif_handle;
799 /* Call the ATIF method */
800 ret = amdgpu_atif_verify_interface(atif);
802 DRM_DEBUG_DRIVER("Call to ATIF verify_interface failed: %d\n", ret);
808 #if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
809 if (atif->notifications.brightness_change) {
810 if (amdgpu_device_has_dc_support(adev)) {
811 #if defined(CONFIG_DRM_AMD_DC)
812 struct amdgpu_display_manager *dm = &adev->dm;
813 atif->bd = dm->backlight_dev;
816 struct drm_encoder *tmp;
818 /* Find the encoder controlling the brightness */
819 list_for_each_entry(tmp, &adev_to_drm(adev)->mode_config.encoder_list,
821 struct amdgpu_encoder *enc = to_amdgpu_encoder(tmp);
823 if ((enc->devices & (ATOM_DEVICE_LCD_SUPPORT)) &&
825 struct amdgpu_encoder_atom_dig *dig = enc->enc_priv;
827 atif->bd = dig->bl_dev;
836 if (atif->functions.sbios_requests && !atif->functions.system_params) {
837 /* XXX check this workraround, if sbios request function is
838 * present we have to see how it's configured in the system
841 atif->functions.system_params = true;
844 if (atif->functions.system_params) {
845 ret = amdgpu_atif_get_notification_params(atif);
847 DRM_DEBUG_DRIVER("Call to GET_SYSTEM_PARAMS failed: %d\n",
849 /* Disable notification */
850 atif->notification_cfg.enabled = false;
854 if (atif->functions.query_backlight_transfer_characteristics) {
855 ret = amdgpu_atif_query_backlight_caps(atif);
857 DRM_DEBUG_DRIVER("Call to QUERY_BACKLIGHT_TRANSFER_CHARACTERISTICS failed: %d\n",
859 atif->backlight_caps.caps_valid = false;
862 atif->backlight_caps.caps_valid = false;
866 adev->acpi_nb.notifier_call = amdgpu_acpi_event;
867 register_acpi_notifier(&adev->acpi_nb);
872 void amdgpu_acpi_get_backlight_caps(struct amdgpu_device *adev,
873 struct amdgpu_dm_backlight_caps *caps)
876 caps->caps_valid = false;
879 caps->caps_valid = adev->atif->backlight_caps.caps_valid;
880 caps->min_input_signal = adev->atif->backlight_caps.min_input_signal;
881 caps->max_input_signal = adev->atif->backlight_caps.max_input_signal;
885 * amdgpu_acpi_fini - tear down driver acpi support
887 * @adev: amdgpu_device pointer
889 * Unregisters with the acpi notifier chain (all asics).
891 void amdgpu_acpi_fini(struct amdgpu_device *adev)
893 unregister_acpi_notifier(&adev->acpi_nb);
898 * amdgpu_acpi_is_s0ix_supported
900 * @adev: amdgpu_device_pointer
902 * returns true if supported, false if not.
904 bool amdgpu_acpi_is_s0ix_supported(struct amdgpu_device *adev)
906 #if defined(CONFIG_AMD_PMC) || defined(CONFIG_AMD_PMC_MODULE)
907 if (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0) {
908 if (adev->flags & AMD_IS_APU)