radeon_acpi.c

  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/acpi.h>
 25#include <linux/backlight.h>
 26#include <linux/pci.h>
 27#include <linux/pm_runtime.h>
 28#include <linux/power_supply.h>
 29#include <linux/slab.h>
 30
 31#include <acpi/acpi_bus.h>
 32#include <acpi/video.h>
 33
 34#include <drm/drm_probe_helper.h>
 35
 36#include "atom.h"
 37#include "radeon.h"
 38#include "radeon_acpi.h"
 39#include "radeon_pm.h"
 40
 41#if defined(CONFIG_VGA_SWITCHEROO)
 42bool radeon_atpx_dgpu_req_power_for_displays(void);
 43#else
 44static inline bool radeon_atpx_dgpu_req_power_for_displays(void) { return false; }
 45#endif
 46
 47#define ACPI_AC_CLASS           "ac_adapter"
 48
 49struct atif_verify_interface {
 50	u16 size;		/* structure size in bytes (includes size field) */
 51	u16 version;		/* version */
 52	u32 notification_mask;	/* supported notifications mask */
 53	u32 function_bits;	/* supported functions bit vector */
 54} __packed;
 55
 56struct atif_system_params {
 57	u16 size;		/* structure size in bytes (includes size field) */
 58	u32 valid_mask;		/* valid flags mask */
 59	u32 flags;		/* flags */
 60	u8 command_code;	/* notify command code */
 61} __packed;
 62
 63struct atif_sbios_requests {
 64	u16 size;		/* structure size in bytes (includes size field) */
 65	u32 pending;		/* pending sbios requests */
 66	u8 panel_exp_mode;	/* panel expansion mode */
 67	u8 thermal_gfx;		/* thermal state: target gfx controller */
 68	u8 thermal_state;	/* thermal state: state id (0: exit state, non-0: state) */
 69	u8 forced_power_gfx;	/* forced power state: target gfx controller */
 70	u8 forced_power_state;	/* forced power state: state id */
 71	u8 system_power_src;	/* system power source */
 72	u8 backlight_level;	/* panel backlight level (0-255) */
 73} __packed;
 74
 75#define ATIF_NOTIFY_MASK	0x3
 76#define ATIF_NOTIFY_NONE	0
 77#define ATIF_NOTIFY_81		1
 78#define ATIF_NOTIFY_N		2
 79
 80struct atcs_verify_interface {
 81	u16 size;		/* structure size in bytes (includes size field) */
 82	u16 version;		/* version */
 83	u32 function_bits;	/* supported functions bit vector */
 84} __packed;
 85
 86#define ATCS_VALID_FLAGS_MASK	0x3
 87
 88struct atcs_pref_req_input {
 89	u16 size;		/* structure size in bytes (includes size field) */
 90	u16 client_id;		/* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
 91	u16 valid_flags_mask;	/* valid flags mask */
 92	u16 flags;		/* flags */
 93	u8 req_type;		/* request type */
 94	u8 perf_req;		/* performance request */
 95} __packed;
 96
 97struct atcs_pref_req_output {
 98	u16 size;		/* structure size in bytes (includes size field) */
 99	u8 ret_val;		/* return value */
100} __packed;
101
102/* Call the ATIF method
103 */
104/**
105 * radeon_atif_call - call an ATIF method
106 *
107 * @handle: acpi handle
108 * @function: the ATIF function to execute
109 * @params: ATIF function params
110 *
111 * Executes the requested ATIF function (all asics).
112 * Returns a pointer to the acpi output buffer.
113 */
114static union acpi_object *radeon_atif_call(acpi_handle handle, int function,
115		struct acpi_buffer *params)
116{
117	acpi_status status;
118	union acpi_object atif_arg_elements[2];
119	struct acpi_object_list atif_arg;
120	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
121
122	atif_arg.count = 2;
123	atif_arg.pointer = &atif_arg_elements[0];
124
125	atif_arg_elements[0].type = ACPI_TYPE_INTEGER;
126	atif_arg_elements[0].integer.value = function;
127
128	if (params) {
129		atif_arg_elements[1].type = ACPI_TYPE_BUFFER;
130		atif_arg_elements[1].buffer.length = params->length;
131		atif_arg_elements[1].buffer.pointer = params->pointer;
132	} else {
133		/* We need a second fake parameter */
134		atif_arg_elements[1].type = ACPI_TYPE_INTEGER;
135		atif_arg_elements[1].integer.value = 0;
136	}
137
138	status = acpi_evaluate_object(handle, "ATIF", &atif_arg, &buffer);
139
140	/* Fail only if calling the method fails and ATIF is supported */
141	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
142		DRM_DEBUG_DRIVER("failed to evaluate ATIF got %s\n",
143				 acpi_format_exception(status));
144		kfree(buffer.pointer);
145		return NULL;
146	}
147
148	return buffer.pointer;
149}
150
151/**
152 * radeon_atif_parse_notification - parse supported notifications
153 *
154 * @n: supported notifications struct
155 * @mask: supported notifications mask from ATIF
156 *
157 * Use the supported notifications mask from ATIF function
158 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what notifications
159 * are supported (all asics).
160 */
161static void radeon_atif_parse_notification(struct radeon_atif_notifications *n, u32 mask)
162{
163	n->display_switch = mask & ATIF_DISPLAY_SWITCH_REQUEST_SUPPORTED;
164	n->expansion_mode_change = mask & ATIF_EXPANSION_MODE_CHANGE_REQUEST_SUPPORTED;
165	n->thermal_state = mask & ATIF_THERMAL_STATE_CHANGE_REQUEST_SUPPORTED;
166	n->forced_power_state = mask & ATIF_FORCED_POWER_STATE_CHANGE_REQUEST_SUPPORTED;
167	n->system_power_state = mask & ATIF_SYSTEM_POWER_SOURCE_CHANGE_REQUEST_SUPPORTED;
168	n->display_conf_change = mask & ATIF_DISPLAY_CONF_CHANGE_REQUEST_SUPPORTED;
169	n->px_gfx_switch = mask & ATIF_PX_GFX_SWITCH_REQUEST_SUPPORTED;
170	n->brightness_change = mask & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST_SUPPORTED;
171	n->dgpu_display_event = mask & ATIF_DGPU_DISPLAY_EVENT_SUPPORTED;
172}
173
174/**
175 * radeon_atif_parse_functions - parse supported functions
176 *
177 * @f: supported functions struct
178 * @mask: supported functions mask from ATIF
179 *
180 * Use the supported functions mask from ATIF function
181 * ATIF_FUNCTION_VERIFY_INTERFACE to determine what functions
182 * are supported (all asics).
183 */
184static void radeon_atif_parse_functions(struct radeon_atif_functions *f, u32 mask)
185{
186	f->system_params = mask & ATIF_GET_SYSTEM_PARAMETERS_SUPPORTED;
187	f->sbios_requests = mask & ATIF_GET_SYSTEM_BIOS_REQUESTS_SUPPORTED;
188	f->select_active_disp = mask & ATIF_SELECT_ACTIVE_DISPLAYS_SUPPORTED;
189	f->lid_state = mask & ATIF_GET_LID_STATE_SUPPORTED;
190	f->get_tv_standard = mask & ATIF_GET_TV_STANDARD_FROM_CMOS_SUPPORTED;
191	f->set_tv_standard = mask & ATIF_SET_TV_STANDARD_IN_CMOS_SUPPORTED;
192	f->get_panel_expansion_mode = mask & ATIF_GET_PANEL_EXPANSION_MODE_FROM_CMOS_SUPPORTED;
193	f->set_panel_expansion_mode = mask & ATIF_SET_PANEL_EXPANSION_MODE_IN_CMOS_SUPPORTED;
194	f->temperature_change = mask & ATIF_TEMPERATURE_CHANGE_NOTIFICATION_SUPPORTED;
195	f->graphics_device_types = mask & ATIF_GET_GRAPHICS_DEVICE_TYPES_SUPPORTED;
196}
197
198/**
199 * radeon_atif_verify_interface - verify ATIF
200 *
201 * @handle: acpi handle
202 * @atif: radeon atif struct
203 *
204 * Execute the ATIF_FUNCTION_VERIFY_INTERFACE ATIF function
205 * to initialize ATIF and determine what features are supported
206 * (all asics).
207 * returns 0 on success, error on failure.
208 */
209static int radeon_atif_verify_interface(acpi_handle handle,
210		struct radeon_atif *atif)
211{
212	union acpi_object *info;
213	struct atif_verify_interface output;
214	size_t size;
215	int err = 0;
216
217	info = radeon_atif_call(handle, ATIF_FUNCTION_VERIFY_INTERFACE, NULL);
218	if (!info)
219		return -EIO;
220
221	memset(&output, 0, sizeof(output));
222
223	size = *(u16 *) info->buffer.pointer;
224	if (size < 12) {
225		DRM_INFO("ATIF buffer is too small: %zu\n", size);
226		err = -EINVAL;
227		goto out;
228	}
229	size = min(sizeof(output), size);
230
231	memcpy(&output, info->buffer.pointer, size);
232
233	/* TODO: check version? */
234	DRM_DEBUG_DRIVER("ATIF version %u\n", output.version);
235
236	radeon_atif_parse_notification(&atif->notifications, output.notification_mask);
237	radeon_atif_parse_functions(&atif->functions, output.function_bits);
238
239out:
240	kfree(info);
241	return err;
242}
243
244/**
245 * radeon_atif_get_notification_params - determine notify configuration
246 *
247 * @handle: acpi handle
248 * @n: atif notification configuration struct
249 *
250 * Execute the ATIF_FUNCTION_GET_SYSTEM_PARAMETERS ATIF function
251 * to determine if a notifier is used and if so which one
252 * (all asics).  This is either Notify(VGA, 0x81) or Notify(VGA, n)
253 * where n is specified in the result if a notifier is used.
254 * Returns 0 on success, error on failure.
255 */
256static int radeon_atif_get_notification_params(acpi_handle handle,
257		struct radeon_atif_notification_cfg *n)
258{
259	union acpi_object *info;
260	struct atif_system_params params;
261	size_t size;
262	int err = 0;
263
264	info = radeon_atif_call(handle, ATIF_FUNCTION_GET_SYSTEM_PARAMETERS, NULL);
265	if (!info) {
266		err = -EIO;
267		goto out;
268	}
269
270	size = *(u16 *) info->buffer.pointer;
271	if (size < 10) {
272		err = -EINVAL;
273		goto out;
274	}
275
276	memset(&params, 0, sizeof(params));
277	size = min(sizeof(params), size);
278	memcpy(&params, info->buffer.pointer, size);
279
280	DRM_DEBUG_DRIVER("SYSTEM_PARAMS: mask = %#x, flags = %#x\n",
281			params.flags, params.valid_mask);
282	params.flags = params.flags & params.valid_mask;
283
284	if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_NONE) {
285		n->enabled = false;
286		n->command_code = 0;
287	} else if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_81) {
288		n->enabled = true;
289		n->command_code = 0x81;
290	} else {
291		if (size < 11) {
292			err = -EINVAL;
293			goto out;
294		}
295		n->enabled = true;
296		n->command_code = params.command_code;
297	}
298
299out:
300	DRM_DEBUG_DRIVER("Notification %s, command code = %#x\n",
301			(n->enabled ? "enabled" : "disabled"),
302			n->command_code);
303	kfree(info);
304	return err;
305}
306
307/**
308 * radeon_atif_get_sbios_requests - get requested sbios event
309 *
310 * @handle: acpi handle
311 * @req: atif sbios request struct
312 *
313 * Execute the ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS ATIF function
314 * to determine what requests the sbios is making to the driver
315 * (all asics).
316 * Returns 0 on success, error on failure.
317 */
318static int radeon_atif_get_sbios_requests(acpi_handle handle,
319		struct atif_sbios_requests *req)
320{
321	union acpi_object *info;
322	size_t size;
323	int count = 0;
324
325	info = radeon_atif_call(handle, ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS, NULL);
326	if (!info)
327		return -EIO;
328
329	size = *(u16 *)info->buffer.pointer;
330	if (size < 0xd) {
331		count = -EINVAL;
332		goto out;
333	}
334	memset(req, 0, sizeof(*req));
335
336	size = min(sizeof(*req), size);
337	memcpy(req, info->buffer.pointer, size);
338	DRM_DEBUG_DRIVER("SBIOS pending requests: %#x\n", req->pending);
339
340	count = hweight32(req->pending);
341
342out:
343	kfree(info);
344	return count;
345}
346
347/**
348 * radeon_atif_handler - handle ATIF notify requests
349 *
350 * @rdev: radeon_device pointer
351 * @event: atif sbios request struct
352 *
353 * Checks the acpi event and if it matches an atif event,
354 * handles it.
355 * Returns NOTIFY code
356 */
357static int radeon_atif_handler(struct radeon_device *rdev,
358		struct acpi_bus_event *event)
359{
360	struct radeon_atif *atif = &rdev->atif;
361	struct atif_sbios_requests req;
362	acpi_handle handle;
363	int count;
364
365	DRM_DEBUG_DRIVER("event, device_class = %s, type = %#x\n",
366			event->device_class, event->type);
367
368	if (strcmp(event->device_class, ACPI_VIDEO_CLASS) != 0)
369		return NOTIFY_DONE;
370
371	if (!atif->notification_cfg.enabled ||
372			event->type != atif->notification_cfg.command_code)
373		/* Not our event */
374		return NOTIFY_DONE;
375
376	/* Check pending SBIOS requests */
377	handle = ACPI_HANDLE(&rdev->pdev->dev);
378	count = radeon_atif_get_sbios_requests(handle, &req);
379
380	if (count <= 0)
381		return NOTIFY_DONE;
382
383	DRM_DEBUG_DRIVER("ATIF: %d pending SBIOS requests\n", count);
384
385	if (req.pending & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST) {
386		struct radeon_encoder *enc = atif->encoder_for_bl;
387
388		if (enc) {
389			DRM_DEBUG_DRIVER("Changing brightness to %d\n",
390					req.backlight_level);
391
392			radeon_set_backlight_level(rdev, enc, req.backlight_level);
393
394			if (rdev->is_atom_bios) {
395				struct radeon_encoder_atom_dig *dig = enc->enc_priv;
396				backlight_force_update(dig->bl_dev,
397						       BACKLIGHT_UPDATE_HOTKEY);
398			} else {
399				struct radeon_encoder_lvds *dig = enc->enc_priv;
400				backlight_force_update(dig->bl_dev,
401						       BACKLIGHT_UPDATE_HOTKEY);
402			}
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_to_drm(rdev)->dev);
409			/* Just fire off a uevent and let userspace tell us what to do */
410			drm_helper_hpd_irq_event(rdev_to_drm(rdev));
411			pm_runtime_put_autosuspend(rdev_to_drm(rdev)->dev);
412		}
413	}
414	/* TODO: check other events */
415
416	/* We've handled the event, stop the notifier chain. The ACPI interface
417	 * overloads ACPI_VIDEO_NOTIFY_PROBE, we don't want to send that to
418	 * userspace if the event was generated only to signal a SBIOS
419	 * request.
420	 */
421	return NOTIFY_BAD;
422}
423
424/* Call the ATCS method
425 */
426/**
427 * radeon_atcs_call - call an ATCS method
428 *
429 * @handle: acpi handle
430 * @function: the ATCS function to execute
431 * @params: ATCS function params
432 *
433 * Executes the requested ATCS function (all asics).
434 * Returns a pointer to the acpi output buffer.
435 */
436static union acpi_object *radeon_atcs_call(acpi_handle handle, int function,
437					   struct acpi_buffer *params)
438{
439	acpi_status status;
440	union acpi_object atcs_arg_elements[2];
441	struct acpi_object_list atcs_arg;
442	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
443
444	atcs_arg.count = 2;
445	atcs_arg.pointer = &atcs_arg_elements[0];
446
447	atcs_arg_elements[0].type = ACPI_TYPE_INTEGER;
448	atcs_arg_elements[0].integer.value = function;
449
450	if (params) {
451		atcs_arg_elements[1].type = ACPI_TYPE_BUFFER;
452		atcs_arg_elements[1].buffer.length = params->length;
453		atcs_arg_elements[1].buffer.pointer = params->pointer;
454	} else {
455		/* We need a second fake parameter */
456		atcs_arg_elements[1].type = ACPI_TYPE_INTEGER;
457		atcs_arg_elements[1].integer.value = 0;
458	}
459
460	status = acpi_evaluate_object(handle, "ATCS", &atcs_arg, &buffer);
461
462	/* Fail only if calling the method fails and ATIF is supported */
463	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
464		DRM_DEBUG_DRIVER("failed to evaluate ATCS got %s\n",
465				 acpi_format_exception(status));
466		kfree(buffer.pointer);
467		return NULL;
468	}
469
470	return buffer.pointer;
471}
472
473/**
474 * radeon_atcs_parse_functions - parse supported functions
475 *
476 * @f: supported functions struct
477 * @mask: supported functions mask from ATCS
478 *
479 * Use the supported functions mask from ATCS function
480 * ATCS_FUNCTION_VERIFY_INTERFACE to determine what functions
481 * are supported (all asics).
482 */
483static void radeon_atcs_parse_functions(struct radeon_atcs_functions *f, u32 mask)
484{
485	f->get_ext_state = mask & ATCS_GET_EXTERNAL_STATE_SUPPORTED;
486	f->pcie_perf_req = mask & ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED;
487	f->pcie_dev_rdy = mask & ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED;
488	f->pcie_bus_width = mask & ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED;
489}
490
491/**
492 * radeon_atcs_verify_interface - verify ATCS
493 *
494 * @handle: acpi handle
495 * @atcs: radeon atcs struct
496 *
497 * Execute the ATCS_FUNCTION_VERIFY_INTERFACE ATCS function
498 * to initialize ATCS and determine what features are supported
499 * (all asics).
500 * returns 0 on success, error on failure.
501 */
502static int radeon_atcs_verify_interface(acpi_handle handle,
503					struct radeon_atcs *atcs)
504{
505	union acpi_object *info;
506	struct atcs_verify_interface output;
507	size_t size;
508	int err = 0;
509
510	info = radeon_atcs_call(handle, ATCS_FUNCTION_VERIFY_INTERFACE, NULL);
511	if (!info)
512		return -EIO;
513
514	memset(&output, 0, sizeof(output));
515
516	size = *(u16 *) info->buffer.pointer;
517	if (size < 8) {
518		DRM_INFO("ATCS buffer is too small: %zu\n", size);
519		err = -EINVAL;
520		goto out;
521	}
522	size = min(sizeof(output), size);
523
524	memcpy(&output, info->buffer.pointer, size);
525
526	/* TODO: check version? */
527	DRM_DEBUG_DRIVER("ATCS version %u\n", output.version);
528
529	radeon_atcs_parse_functions(&atcs->functions, output.function_bits);
530
531out:
532	kfree(info);
533	return err;
534}
535
536/**
537 * radeon_acpi_is_pcie_performance_request_supported
538 *
539 * @rdev: radeon_device pointer
540 *
541 * Check if the ATCS pcie_perf_req and pcie_dev_rdy methods
542 * are supported (all asics).
543 * returns true if supported, false if not.
544 */
545bool radeon_acpi_is_pcie_performance_request_supported(struct radeon_device *rdev)
546{
547	struct radeon_atcs *atcs = &rdev->atcs;
548
549	if (atcs->functions.pcie_perf_req && atcs->functions.pcie_dev_rdy)
550		return true;
551
552	return false;
553}
554
555/**
556 * radeon_acpi_pcie_notify_device_ready
557 *
558 * @rdev: radeon_device pointer
559 *
560 * Executes the PCIE_DEVICE_READY_NOTIFICATION method
561 * (all asics).
562 * returns 0 on success, error on failure.
563 */
564int radeon_acpi_pcie_notify_device_ready(struct radeon_device *rdev)
565{
566	acpi_handle handle;
567	union acpi_object *info;
568	struct radeon_atcs *atcs = &rdev->atcs;
569
570	/* Get the device handle */
571	handle = ACPI_HANDLE(&rdev->pdev->dev);
572	if (!handle)
573		return -EINVAL;
574
575	if (!atcs->functions.pcie_dev_rdy)
576		return -EINVAL;
577
578	info = radeon_atcs_call(handle, ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION, NULL);
579	if (!info)
580		return -EIO;
581
582	kfree(info);
583
584	return 0;
585}
586
587/**
588 * radeon_acpi_pcie_performance_request
589 *
590 * @rdev: radeon_device pointer
591 * @perf_req: requested perf level (pcie gen speed)
592 * @advertise: set advertise caps flag if set
593 *
594 * Executes the PCIE_PERFORMANCE_REQUEST method to
595 * change the pcie gen speed (all asics).
596 * returns 0 on success, error on failure.
597 */
598int radeon_acpi_pcie_performance_request(struct radeon_device *rdev,
599					 u8 perf_req, bool advertise)
600{
601	acpi_handle handle;
602	union acpi_object *info;
603	struct radeon_atcs *atcs = &rdev->atcs;
604	struct atcs_pref_req_input atcs_input;
605	struct atcs_pref_req_output atcs_output;
606	struct acpi_buffer params;
607	size_t size;
608	u32 retry = 3;
609
610	/* Get the device handle */
611	handle = ACPI_HANDLE(&rdev->pdev->dev);
612	if (!handle)
613		return -EINVAL;
614
615	if (!atcs->functions.pcie_perf_req)
616		return -EINVAL;
617
618	atcs_input.size = sizeof(struct atcs_pref_req_input);
619	/* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
620	atcs_input.client_id = pci_dev_id(rdev->pdev);
621	atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
622	atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
623	if (advertise)
624		atcs_input.flags |= ATCS_ADVERTISE_CAPS;
625	atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
626	atcs_input.perf_req = perf_req;
627
628	params.length = sizeof(struct atcs_pref_req_input);
629	params.pointer = &atcs_input;
630
631	while (retry--) {
632		info = radeon_atcs_call(handle, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST, &params);
633		if (!info)
634			return -EIO;
635
636		memset(&atcs_output, 0, sizeof(atcs_output));
637
638		size = *(u16 *) info->buffer.pointer;
639		if (size < 3) {
640			DRM_INFO("ATCS buffer is too small: %zu\n", size);
641			kfree(info);
642			return -EINVAL;
643		}
644		size = min(sizeof(atcs_output), size);
645
646		memcpy(&atcs_output, info->buffer.pointer, size);
647
648		kfree(info);
649
650		switch (atcs_output.ret_val) {
651		case ATCS_REQUEST_REFUSED:
652		default:
653			return -EINVAL;
654		case ATCS_REQUEST_COMPLETE:
655			return 0;
656		case ATCS_REQUEST_IN_PROGRESS:
657			udelay(10);
658			break;
659		}
660	}
661
662	return 0;
663}
664
665/**
666 * radeon_acpi_event - handle notify events
667 *
668 * @nb: notifier block
669 * @val: val
670 * @data: acpi event
671 *
672 * Calls relevant radeon functions in response to various
673 * acpi events.
674 * Returns NOTIFY code
675 */
676static int radeon_acpi_event(struct notifier_block *nb,
677			     unsigned long val,
678			     void *data)
679{
680	struct radeon_device *rdev = container_of(nb, struct radeon_device, acpi_nb);
681	struct acpi_bus_event *entry = (struct acpi_bus_event *)data;
682
683	if (strcmp(entry->device_class, ACPI_AC_CLASS) == 0) {
684		if (power_supply_is_system_supplied() > 0)
685			DRM_DEBUG_DRIVER("pm: AC\n");
686		else
687			DRM_DEBUG_DRIVER("pm: DC\n");
688
689		radeon_pm_acpi_event_handler(rdev);
690	}
691
692	/* Check for pending SBIOS requests */
693	return radeon_atif_handler(rdev, entry);
694}
695
696/* Call all ACPI methods here */
697/**
698 * radeon_acpi_init - init driver acpi support
699 *
700 * @rdev: radeon_device pointer
701 *
702 * Verifies the AMD ACPI interfaces and registers with the acpi
703 * notifier chain (all asics).
704 * Returns 0 on success, error on failure.
705 */
706int radeon_acpi_init(struct radeon_device *rdev)
707{
708	acpi_handle handle;
709	struct radeon_atif *atif = &rdev->atif;
710	struct radeon_atcs *atcs = &rdev->atcs;
711	int ret;
712
713	/* Get the device handle */
714	handle = ACPI_HANDLE(&rdev->pdev->dev);
715
716	/* No need to proceed if we're sure that ATIF is not supported */
717	if (!ASIC_IS_AVIVO(rdev) || !rdev->bios || !handle)
718		return 0;
719
720	/* Call the ATCS method */
721	ret = radeon_atcs_verify_interface(handle, atcs);
722	if (ret) {
723		DRM_DEBUG_DRIVER("Call to ATCS verify_interface failed: %d\n", ret);
724	}
725
726	/* Call the ATIF method */
727	ret = radeon_atif_verify_interface(handle, atif);
728	if (ret) {
729		DRM_DEBUG_DRIVER("Call to ATIF verify_interface failed: %d\n", ret);
730		goto out;
731	}
732
733	if (atif->notifications.brightness_change) {
734		struct drm_encoder *tmp;
735		struct radeon_encoder *target = NULL;
736
737		/* Find the encoder controlling the brightness */
738		list_for_each_entry(tmp, &rdev_to_drm(rdev)->mode_config.encoder_list,
739				head) {
740			struct radeon_encoder *enc = to_radeon_encoder(tmp);
741
742			if ((enc->devices & (ATOM_DEVICE_LCD_SUPPORT)) &&
743			    enc->enc_priv) {
744				if (rdev->is_atom_bios) {
745					struct radeon_encoder_atom_dig *dig = enc->enc_priv;
746					if (dig->bl_dev) {
747						target = enc;
748						break;
749					}
750				} else {
751					struct radeon_encoder_lvds *dig = enc->enc_priv;
752					if (dig->bl_dev) {
753						target = enc;
754						break;
755					}
756				}
757			}
758		}
759
760		atif->encoder_for_bl = target;
761	}
762
763	if (atif->functions.sbios_requests && !atif->functions.system_params) {
764		/* XXX check this workraround, if sbios request function is
765		 * present we have to see how it's configured in the system
766		 * params
767		 */
768		atif->functions.system_params = true;
769	}
770
771	if (atif->functions.system_params) {
772		ret = radeon_atif_get_notification_params(handle,
773				&atif->notification_cfg);
774		if (ret) {
775			DRM_DEBUG_DRIVER("Call to GET_SYSTEM_PARAMS failed: %d\n",
776					ret);
777			/* Disable notification */
778			atif->notification_cfg.enabled = false;
779		}
780	}
781
782out:
783	rdev->acpi_nb.notifier_call = radeon_acpi_event;
784	register_acpi_notifier(&rdev->acpi_nb);
785
786	return ret;
787}
788
789/**
790 * radeon_acpi_fini - tear down driver acpi support
791 *
792 * @rdev: radeon_device pointer
793 *
794 * Unregisters with the acpi notifier chain (all asics).
795 */
796void radeon_acpi_fini(struct radeon_device *rdev)
797{
798	unregister_acpi_notifier(&rdev->acpi_nb);
799}