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