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 <drm/drm_probe_helper.h>
33#include "radeon.h"
34#include "radeon_acpi.h"
35#include "atom.h"
36
37#if defined(CONFIG_VGA_SWITCHEROO)
38bool radeon_atpx_dgpu_req_power_for_displays(void);
39#else
40static inline bool radeon_atpx_dgpu_req_power_for_displays(void) { return false; }
41#endif
42
43#define ACPI_AC_CLASS "ac_adapter"
44
45extern void radeon_pm_acpi_event_handler(struct radeon_device *rdev);
46
47struct atif_verify_interface {
48 u16 size; /* structure size in bytes (includes size field) */
49 u16 version; /* version */
50 u32 notification_mask; /* supported notifications mask */
51 u32 function_bits; /* supported functions bit vector */
52} __packed;
53
54struct atif_system_params {
55 u16 size; /* structure size in bytes (includes size field) */
56 u32 valid_mask; /* valid flags mask */
57 u32 flags; /* flags */
58 u8 command_code; /* notify command code */
59} __packed;
60
61struct atif_sbios_requests {
62 u16 size; /* structure size in bytes (includes size field) */
63 u32 pending; /* pending sbios requests */
64 u8 panel_exp_mode; /* panel expansion mode */
65 u8 thermal_gfx; /* thermal state: target gfx controller */
66 u8 thermal_state; /* thermal state: state id (0: exit state, non-0: state) */
67 u8 forced_power_gfx; /* forced power state: target gfx controller */
68 u8 forced_power_state; /* forced power state: state id */
69 u8 system_power_src; /* system power source */
70 u8 backlight_level; /* panel backlight level (0-255) */
71} __packed;
72
73#define ATIF_NOTIFY_MASK 0x3
74#define ATIF_NOTIFY_NONE 0
75#define ATIF_NOTIFY_81 1
76#define ATIF_NOTIFY_N 2
77
78struct atcs_verify_interface {
79 u16 size; /* structure size in bytes (includes size field) */
80 u16 version; /* version */
81 u32 function_bits; /* supported functions bit vector */
82} __packed;
83
84#define ATCS_VALID_FLAGS_MASK 0x3
85
86struct atcs_pref_req_input {
87 u16 size; /* structure size in bytes (includes size field) */
88 u16 client_id; /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
89 u16 valid_flags_mask; /* valid flags mask */
90 u16 flags; /* flags */
91 u8 req_type; /* request type */
92 u8 perf_req; /* performance request */
93} __packed;
94
95struct atcs_pref_req_output {
96 u16 size; /* structure size in bytes (includes size field) */
97 u8 ret_val; /* return value */
98} __packed;
99
100/* Call the ATIF method
101 */
102/**
103 * radeon_atif_call - call an ATIF method
104 *
105 * @handle: acpi handle
106 * @function: the ATIF function to execute
107 * @params: ATIF function params
108 *
109 * Executes the requested ATIF function (all asics).
110 * Returns a pointer to the acpi output buffer.
111 */
112static union acpi_object *radeon_atif_call(acpi_handle handle, int function,
113 struct acpi_buffer *params)
114{
115 acpi_status status;
116 union acpi_object atif_arg_elements[2];
117 struct acpi_object_list atif_arg;
118 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
119
120 atif_arg.count = 2;
121 atif_arg.pointer = &atif_arg_elements[0];
122
123 atif_arg_elements[0].type = ACPI_TYPE_INTEGER;
124 atif_arg_elements[0].integer.value = function;
125
126 if (params) {
127 atif_arg_elements[1].type = ACPI_TYPE_BUFFER;
128 atif_arg_elements[1].buffer.length = params->length;
129 atif_arg_elements[1].buffer.pointer = params->pointer;
130 } else {
131 /* We need a second fake parameter */
132 atif_arg_elements[1].type = ACPI_TYPE_INTEGER;
133 atif_arg_elements[1].integer.value = 0;
134 }
135
136 status = acpi_evaluate_object(handle, "ATIF", &atif_arg, &buffer);
137
138 /* Fail only if calling the method fails and ATIF is supported */
139 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
140 DRM_DEBUG_DRIVER("failed to evaluate ATIF got %s\n",
141 acpi_format_exception(status));
142 kfree(buffer.pointer);
143 return NULL;
144 }
145
146 return buffer.pointer;
147}
148
149/**
150 * radeon_atif_parse_notification - parse supported notifications
151 *
152 * @n: supported notifications struct
153 * @mask: supported notifications mask from ATIF
154 *
155 * Use the supported notifications mask from ATIF function
156 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what notifications
157 * are supported (all asics).
158 */
159static void radeon_atif_parse_notification(struct radeon_atif_notifications *n, u32 mask)
160{
161 n->display_switch = mask & ATIF_DISPLAY_SWITCH_REQUEST_SUPPORTED;
162 n->expansion_mode_change = mask & ATIF_EXPANSION_MODE_CHANGE_REQUEST_SUPPORTED;
163 n->thermal_state = mask & ATIF_THERMAL_STATE_CHANGE_REQUEST_SUPPORTED;
164 n->forced_power_state = mask & ATIF_FORCED_POWER_STATE_CHANGE_REQUEST_SUPPORTED;
165 n->system_power_state = mask & ATIF_SYSTEM_POWER_SOURCE_CHANGE_REQUEST_SUPPORTED;
166 n->display_conf_change = mask & ATIF_DISPLAY_CONF_CHANGE_REQUEST_SUPPORTED;
167 n->px_gfx_switch = mask & ATIF_PX_GFX_SWITCH_REQUEST_SUPPORTED;
168 n->brightness_change = mask & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST_SUPPORTED;
169 n->dgpu_display_event = mask & ATIF_DGPU_DISPLAY_EVENT_SUPPORTED;
170}
171
172/**
173 * radeon_atif_parse_functions - parse supported functions
174 *
175 * @f: supported functions struct
176 * @mask: supported functions mask from ATIF
177 *
178 * Use the supported functions mask from ATIF function
179 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what functions
180 * are supported (all asics).
181 */
182static void radeon_atif_parse_functions(struct radeon_atif_functions *f, u32 mask)
183{
184 f->system_params = mask & ATIF_GET_SYSTEM_PARAMETERS_SUPPORTED;
185 f->sbios_requests = mask & ATIF_GET_SYSTEM_BIOS_REQUESTS_SUPPORTED;
186 f->select_active_disp = mask & ATIF_SELECT_ACTIVE_DISPLAYS_SUPPORTED;
187 f->lid_state = mask & ATIF_GET_LID_STATE_SUPPORTED;
188 f->get_tv_standard = mask & ATIF_GET_TV_STANDARD_FROM_CMOS_SUPPORTED;
189 f->set_tv_standard = mask & ATIF_SET_TV_STANDARD_IN_CMOS_SUPPORTED;
190 f->get_panel_expansion_mode = mask & ATIF_GET_PANEL_EXPANSION_MODE_FROM_CMOS_SUPPORTED;
191 f->set_panel_expansion_mode = mask & ATIF_SET_PANEL_EXPANSION_MODE_IN_CMOS_SUPPORTED;
192 f->temperature_change = mask & ATIF_TEMPERATURE_CHANGE_NOTIFICATION_SUPPORTED;
193 f->graphics_device_types = mask & ATIF_GET_GRAPHICS_DEVICE_TYPES_SUPPORTED;
194}
195
196/**
197 * radeon_atif_verify_interface - verify ATIF
198 *
199 * @handle: acpi handle
200 * @atif: radeon atif struct
201 *
202 * Execute the ATIF_FUNCTION_VERIFY_INTERFACE ATIF function
203 * to initialize ATIF and determine what features are supported
204 * (all asics).
205 * returns 0 on success, error on failure.
206 */
207static int radeon_atif_verify_interface(acpi_handle handle,
208 struct radeon_atif *atif)
209{
210 union acpi_object *info;
211 struct atif_verify_interface output;
212 size_t size;
213 int err = 0;
214
215 info = radeon_atif_call(handle, ATIF_FUNCTION_VERIFY_INTERFACE, NULL);
216 if (!info)
217 return -EIO;
218
219 memset(&output, 0, sizeof(output));
220
221 size = *(u16 *) info->buffer.pointer;
222 if (size < 12) {
223 DRM_INFO("ATIF buffer is too small: %zu\n", size);
224 err = -EINVAL;
225 goto out;
226 }
227 size = min(sizeof(output), size);
228
229 memcpy(&output, info->buffer.pointer, size);
230
231 /* TODO: check version? */
232 DRM_DEBUG_DRIVER("ATIF version %u\n", output.version);
233
234 radeon_atif_parse_notification(&atif->notifications, output.notification_mask);
235 radeon_atif_parse_functions(&atif->functions, output.function_bits);
236
237out:
238 kfree(info);
239 return err;
240}
241
242/**
243 * radeon_atif_get_notification_params - determine notify configuration
244 *
245 * @handle: acpi handle
246 * @n: atif notification configuration struct
247 *
248 * Execute the ATIF_FUNCTION_GET_SYSTEM_PARAMETERS ATIF function
249 * to determine if a notifier is used and if so which one
250 * (all asics). This is either Notify(VGA, 0x81) or Notify(VGA, n)
251 * where n is specified in the result if a notifier is used.
252 * Returns 0 on success, error on failure.
253 */
254static int radeon_atif_get_notification_params(acpi_handle handle,
255 struct radeon_atif_notification_cfg *n)
256{
257 union acpi_object *info;
258 struct atif_system_params params;
259 size_t size;
260 int err = 0;
261
262 info = radeon_atif_call(handle, ATIF_FUNCTION_GET_SYSTEM_PARAMETERS, NULL);
263 if (!info) {
264 err = -EIO;
265 goto out;
266 }
267
268 size = *(u16 *) info->buffer.pointer;
269 if (size < 10) {
270 err = -EINVAL;
271 goto out;
272 }
273
274 memset(&params, 0, sizeof(params));
275 size = min(sizeof(params), size);
276 memcpy(&params, info->buffer.pointer, size);
277
278 DRM_DEBUG_DRIVER("SYSTEM_PARAMS: mask = %#x, flags = %#x\n",
279 params.flags, params.valid_mask);
280 params.flags = params.flags & params.valid_mask;
281
282 if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_NONE) {
283 n->enabled = false;
284 n->command_code = 0;
285 } else if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_81) {
286 n->enabled = true;
287 n->command_code = 0x81;
288 } else {
289 if (size < 11) {
290 err = -EINVAL;
291 goto out;
292 }
293 n->enabled = true;
294 n->command_code = params.command_code;
295 }
296
297out:
298 DRM_DEBUG_DRIVER("Notification %s, command code = %#x\n",
299 (n->enabled ? "enabled" : "disabled"),
300 n->command_code);
301 kfree(info);
302 return err;
303}
304
305/**
306 * radeon_atif_get_sbios_requests - get requested sbios event
307 *
308 * @handle: acpi handle
309 * @req: atif sbios request struct
310 *
311 * Execute the ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS ATIF function
312 * to determine what requests the sbios is making to the driver
313 * (all asics).
314 * Returns 0 on success, error on failure.
315 */
316static int radeon_atif_get_sbios_requests(acpi_handle handle,
317 struct atif_sbios_requests *req)
318{
319 union acpi_object *info;
320 size_t size;
321 int count = 0;
322
323 info = radeon_atif_call(handle, ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS, NULL);
324 if (!info)
325 return -EIO;
326
327 size = *(u16 *)info->buffer.pointer;
328 if (size < 0xd) {
329 count = -EINVAL;
330 goto out;
331 }
332 memset(req, 0, sizeof(*req));
333
334 size = min(sizeof(*req), size);
335 memcpy(req, info->buffer.pointer, size);
336 DRM_DEBUG_DRIVER("SBIOS pending requests: %#x\n", req->pending);
337
338 count = hweight32(req->pending);
339
340out:
341 kfree(info);
342 return count;
343}
344
345/**
346 * radeon_atif_handler - handle ATIF notify requests
347 *
348 * @rdev: radeon_device pointer
349 * @event: atif sbios request struct
350 *
351 * Checks the acpi event and if it matches an atif event,
352 * handles it.
353 * Returns NOTIFY code
354 */
355static int radeon_atif_handler(struct radeon_device *rdev,
356 struct acpi_bus_event *event)
357{
358 struct radeon_atif *atif = &rdev->atif;
359 struct atif_sbios_requests req;
360 acpi_handle handle;
361 int count;
362
363 DRM_DEBUG_DRIVER("event, device_class = %s, type = %#x\n",
364 event->device_class, event->type);
365
366 if (strcmp(event->device_class, ACPI_VIDEO_CLASS) != 0)
367 return NOTIFY_DONE;
368
369 if (!atif->notification_cfg.enabled ||
370 event->type != atif->notification_cfg.command_code)
371 /* Not our event */
372 return NOTIFY_DONE;
373
374 /* Check pending SBIOS requests */
375 handle = ACPI_HANDLE(&rdev->pdev->dev);
376 count = radeon_atif_get_sbios_requests(handle, &req);
377
378 if (count <= 0)
379 return NOTIFY_DONE;
380
381 DRM_DEBUG_DRIVER("ATIF: %d pending SBIOS requests\n", count);
382
383 if (req.pending & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST) {
384 struct radeon_encoder *enc = atif->encoder_for_bl;
385
386 if (enc) {
387 DRM_DEBUG_DRIVER("Changing brightness to %d\n",
388 req.backlight_level);
389
390 radeon_set_backlight_level(rdev, enc, req.backlight_level);
391
392#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
393 if (rdev->is_atom_bios) {
394 struct radeon_encoder_atom_dig *dig = enc->enc_priv;
395 backlight_force_update(dig->bl_dev,
396 BACKLIGHT_UPDATE_HOTKEY);
397 } else {
398 struct radeon_encoder_lvds *dig = enc->enc_priv;
399 backlight_force_update(dig->bl_dev,
400 BACKLIGHT_UPDATE_HOTKEY);
401 }
402#endif
403 }
404 }
405 if (req.pending & ATIF_DGPU_DISPLAY_EVENT) {
406 if ((rdev->flags & RADEON_IS_PX) &&
407 radeon_atpx_dgpu_req_power_for_displays()) {
408 pm_runtime_get_sync(rdev->ddev->dev);
409 /* Just fire off a uevent and let userspace tell us what to do */
410 drm_helper_hpd_irq_event(rdev->ddev);
411 pm_runtime_mark_last_busy(rdev->ddev->dev);
412 pm_runtime_put_autosuspend(rdev->ddev->dev);
413 }
414 }
415 /* TODO: check other events */
416
417 /* We've handled the event, stop the notifier chain. The ACPI interface
418 * overloads ACPI_VIDEO_NOTIFY_PROBE, we don't want to send that to
419 * userspace if the event was generated only to signal a SBIOS
420 * request.
421 */
422 return NOTIFY_BAD;
423}
424
425/* Call the ATCS method
426 */
427/**
428 * radeon_atcs_call - call an ATCS method
429 *
430 * @handle: acpi handle
431 * @function: the ATCS function to execute
432 * @params: ATCS function params
433 *
434 * Executes the requested ATCS function (all asics).
435 * Returns a pointer to the acpi output buffer.
436 */
437static union acpi_object *radeon_atcs_call(acpi_handle handle, int function,
438 struct acpi_buffer *params)
439{
440 acpi_status status;
441 union acpi_object atcs_arg_elements[2];
442 struct acpi_object_list atcs_arg;
443 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
444
445 atcs_arg.count = 2;
446 atcs_arg.pointer = &atcs_arg_elements[0];
447
448 atcs_arg_elements[0].type = ACPI_TYPE_INTEGER;
449 atcs_arg_elements[0].integer.value = function;
450
451 if (params) {
452 atcs_arg_elements[1].type = ACPI_TYPE_BUFFER;
453 atcs_arg_elements[1].buffer.length = params->length;
454 atcs_arg_elements[1].buffer.pointer = params->pointer;
455 } else {
456 /* We need a second fake parameter */
457 atcs_arg_elements[1].type = ACPI_TYPE_INTEGER;
458 atcs_arg_elements[1].integer.value = 0;
459 }
460
461 status = acpi_evaluate_object(handle, "ATCS", &atcs_arg, &buffer);
462
463 /* Fail only if calling the method fails and ATIF is supported */
464 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
465 DRM_DEBUG_DRIVER("failed to evaluate ATCS got %s\n",
466 acpi_format_exception(status));
467 kfree(buffer.pointer);
468 return NULL;
469 }
470
471 return buffer.pointer;
472}
473
474/**
475 * radeon_atcs_parse_functions - parse supported functions
476 *
477 * @f: supported functions struct
478 * @mask: supported functions mask from ATCS
479 *
480 * Use the supported functions mask from ATCS function
481 * ATCS_FUNCTION_VERIFY_INTERFACE to determine what functions
482 * are supported (all asics).
483 */
484static void radeon_atcs_parse_functions(struct radeon_atcs_functions *f, u32 mask)
485{
486 f->get_ext_state = mask & ATCS_GET_EXTERNAL_STATE_SUPPORTED;
487 f->pcie_perf_req = mask & ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED;
488 f->pcie_dev_rdy = mask & ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED;
489 f->pcie_bus_width = mask & ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED;
490}
491
492/**
493 * radeon_atcs_verify_interface - verify ATCS
494 *
495 * @handle: acpi handle
496 * @atcs: radeon atcs struct
497 *
498 * Execute the ATCS_FUNCTION_VERIFY_INTERFACE ATCS function
499 * to initialize ATCS and determine what features are supported
500 * (all asics).
501 * returns 0 on success, error on failure.
502 */
503static int radeon_atcs_verify_interface(acpi_handle handle,
504 struct radeon_atcs *atcs)
505{
506 union acpi_object *info;
507 struct atcs_verify_interface output;
508 size_t size;
509 int err = 0;
510
511 info = radeon_atcs_call(handle, ATCS_FUNCTION_VERIFY_INTERFACE, NULL);
512 if (!info)
513 return -EIO;
514
515 memset(&output, 0, sizeof(output));
516
517 size = *(u16 *) info->buffer.pointer;
518 if (size < 8) {
519 DRM_INFO("ATCS buffer is too small: %zu\n", size);
520 err = -EINVAL;
521 goto out;
522 }
523 size = min(sizeof(output), size);
524
525 memcpy(&output, info->buffer.pointer, size);
526
527 /* TODO: check version? */
528 DRM_DEBUG_DRIVER("ATCS version %u\n", output.version);
529
530 radeon_atcs_parse_functions(&atcs->functions, output.function_bits);
531
532out:
533 kfree(info);
534 return err;
535}
536
537/**
538 * radeon_acpi_is_pcie_performance_request_supported
539 *
540 * @rdev: radeon_device pointer
541 *
542 * Check if the ATCS pcie_perf_req and pcie_dev_rdy methods
543 * are supported (all asics).
544 * returns true if supported, false if not.
545 */
546bool radeon_acpi_is_pcie_performance_request_supported(struct radeon_device *rdev)
547{
548 struct radeon_atcs *atcs = &rdev->atcs;
549
550 if (atcs->functions.pcie_perf_req && atcs->functions.pcie_dev_rdy)
551 return true;
552
553 return false;
554}
555
556/**
557 * radeon_acpi_pcie_notify_device_ready
558 *
559 * @rdev: radeon_device pointer
560 *
561 * Executes the PCIE_DEVICE_READY_NOTIFICATION method
562 * (all asics).
563 * returns 0 on success, error on failure.
564 */
565int radeon_acpi_pcie_notify_device_ready(struct radeon_device *rdev)
566{
567 acpi_handle handle;
568 union acpi_object *info;
569 struct radeon_atcs *atcs = &rdev->atcs;
570
571 /* Get the device handle */
572 handle = ACPI_HANDLE(&rdev->pdev->dev);
573 if (!handle)
574 return -EINVAL;
575
576 if (!atcs->functions.pcie_dev_rdy)
577 return -EINVAL;
578
579 info = radeon_atcs_call(handle, ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION, NULL);
580 if (!info)
581 return -EIO;
582
583 kfree(info);
584
585 return 0;
586}
587
588/**
589 * radeon_acpi_pcie_performance_request
590 *
591 * @rdev: radeon_device pointer
592 * @perf_req: requested perf level (pcie gen speed)
593 * @advertise: set advertise caps flag if set
594 *
595 * Executes the PCIE_PERFORMANCE_REQUEST method to
596 * change the pcie gen speed (all asics).
597 * returns 0 on success, error on failure.
598 */
599int radeon_acpi_pcie_performance_request(struct radeon_device *rdev,
600 u8 perf_req, bool advertise)
601{
602 acpi_handle handle;
603 union acpi_object *info;
604 struct radeon_atcs *atcs = &rdev->atcs;
605 struct atcs_pref_req_input atcs_input;
606 struct atcs_pref_req_output atcs_output;
607 struct acpi_buffer params;
608 size_t size;
609 u32 retry = 3;
610
611 /* Get the device handle */
612 handle = ACPI_HANDLE(&rdev->pdev->dev);
613 if (!handle)
614 return -EINVAL;
615
616 if (!atcs->functions.pcie_perf_req)
617 return -EINVAL;
618
619 atcs_input.size = sizeof(struct atcs_pref_req_input);
620 /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
621 atcs_input.client_id = rdev->pdev->devfn | (rdev->pdev->bus->number << 8);
622 atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
623 atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
624 if (advertise)
625 atcs_input.flags |= ATCS_ADVERTISE_CAPS;
626 atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
627 atcs_input.perf_req = perf_req;
628
629 params.length = sizeof(struct atcs_pref_req_input);
630 params.pointer = &atcs_input;
631
632 while (retry--) {
633 info = radeon_atcs_call(handle, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST, &params);
634 if (!info)
635 return -EIO;
636
637 memset(&atcs_output, 0, sizeof(atcs_output));
638
639 size = *(u16 *) info->buffer.pointer;
640 if (size < 3) {
641 DRM_INFO("ATCS buffer is too small: %zu\n", size);
642 kfree(info);
643 return -EINVAL;
644 }
645 size = min(sizeof(atcs_output), size);
646
647 memcpy(&atcs_output, info->buffer.pointer, size);
648
649 kfree(info);
650
651 switch (atcs_output.ret_val) {
652 case ATCS_REQUEST_REFUSED:
653 default:
654 return -EINVAL;
655 case ATCS_REQUEST_COMPLETE:
656 return 0;
657 case ATCS_REQUEST_IN_PROGRESS:
658 udelay(10);
659 break;
660 }
661 }
662
663 return 0;
664}
665
666/**
667 * radeon_acpi_event - handle notify events
668 *
669 * @nb: notifier block
670 * @val: val
671 * @data: acpi event
672 *
673 * Calls relevant radeon functions in response to various
674 * acpi events.
675 * Returns NOTIFY code
676 */
677static int radeon_acpi_event(struct notifier_block *nb,
678 unsigned long val,
679 void *data)
680{
681 struct radeon_device *rdev = container_of(nb, struct radeon_device, acpi_nb);
682 struct acpi_bus_event *entry = (struct acpi_bus_event *)data;
683
684 if (strcmp(entry->device_class, ACPI_AC_CLASS) == 0) {
685 if (power_supply_is_system_supplied() > 0)
686 DRM_DEBUG_DRIVER("pm: AC\n");
687 else
688 DRM_DEBUG_DRIVER("pm: DC\n");
689
690 radeon_pm_acpi_event_handler(rdev);
691 }
692
693 /* Check for pending SBIOS requests */
694 return radeon_atif_handler(rdev, entry);
695}
696
697/* Call all ACPI methods here */
698/**
699 * radeon_acpi_init - init driver acpi support
700 *
701 * @rdev: radeon_device pointer
702 *
703 * Verifies the AMD ACPI interfaces and registers with the acpi
704 * notifier chain (all asics).
705 * Returns 0 on success, error on failure.
706 */
707int radeon_acpi_init(struct radeon_device *rdev)
708{
709 acpi_handle handle;
710 struct radeon_atif *atif = &rdev->atif;
711 struct radeon_atcs *atcs = &rdev->atcs;
712 int ret;
713
714 /* Get the device handle */
715 handle = ACPI_HANDLE(&rdev->pdev->dev);
716
717 /* No need to proceed if we're sure that ATIF is not supported */
718 if (!ASIC_IS_AVIVO(rdev) || !rdev->bios || !handle)
719 return 0;
720
721 /* Call the ATCS method */
722 ret = radeon_atcs_verify_interface(handle, atcs);
723 if (ret) {
724 DRM_DEBUG_DRIVER("Call to ATCS verify_interface failed: %d\n", ret);
725 }
726
727 /* Call the ATIF method */
728 ret = radeon_atif_verify_interface(handle, atif);
729 if (ret) {
730 DRM_DEBUG_DRIVER("Call to ATIF verify_interface failed: %d\n", ret);
731 goto out;
732 }
733
734 if (atif->notifications.brightness_change) {
735 struct drm_encoder *tmp;
736 struct radeon_encoder *target = NULL;
737
738 /* Find the encoder controlling the brightness */
739 list_for_each_entry(tmp, &rdev->ddev->mode_config.encoder_list,
740 head) {
741 struct radeon_encoder *enc = to_radeon_encoder(tmp);
742
743 if ((enc->devices & (ATOM_DEVICE_LCD_SUPPORT)) &&
744 enc->enc_priv) {
745 if (rdev->is_atom_bios) {
746 struct radeon_encoder_atom_dig *dig = enc->enc_priv;
747 if (dig->bl_dev) {
748 target = enc;
749 break;
750 }
751 } else {
752 struct radeon_encoder_lvds *dig = enc->enc_priv;
753 if (dig->bl_dev) {
754 target = enc;
755 break;
756 }
757 }
758 }
759 }
760
761 atif->encoder_for_bl = target;
762 }
763
764 if (atif->functions.sbios_requests && !atif->functions.system_params) {
765 /* XXX check this workraround, if sbios request function is
766 * present we have to see how it's configured in the system
767 * params
768 */
769 atif->functions.system_params = true;
770 }
771
772 if (atif->functions.system_params) {
773 ret = radeon_atif_get_notification_params(handle,
774 &atif->notification_cfg);
775 if (ret) {
776 DRM_DEBUG_DRIVER("Call to GET_SYSTEM_PARAMS failed: %d\n",
777 ret);
778 /* Disable notification */
779 atif->notification_cfg.enabled = false;
780 }
781 }
782
783out:
784 rdev->acpi_nb.notifier_call = radeon_acpi_event;
785 register_acpi_notifier(&rdev->acpi_nb);
786
787 return ret;
788}
789
790/**
791 * radeon_acpi_fini - tear down driver acpi support
792 *
793 * @rdev: radeon_device pointer
794 *
795 * Unregisters with the acpi notifier chain (all asics).
796 */
797void radeon_acpi_fini(struct radeon_device *rdev)
798{
799 unregister_acpi_notifier(&rdev->acpi_nb);
800}
801