summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
blob: 1544ed3f17473cb80c0009c338bccd60f245a52c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
/*
 * Copyright 2016 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: AMD
 *
 */

#include "dm_services.h"
#include "dc.h"
#include "mod_freesync.h"
#include "core_types.h"

#define MOD_FREESYNC_MAX_CONCURRENT_STREAMS  32

#define MIN_REFRESH_RANGE_IN_US 10000000
/* Refresh rate ramp at a fixed rate of 65 Hz/second */
#define STATIC_SCREEN_RAMP_DELTA_REFRESH_RATE_PER_FRAME ((1000 / 60) * 65)
/* Number of elements in the render times cache array */
#define RENDER_TIMES_MAX_COUNT 10
/* Threshold to exit BTR (to avoid frequent enter-exits at the lower limit) */
#define BTR_EXIT_MARGIN 2000
/*Threshold to exit fixed refresh rate*/
#define FIXED_REFRESH_EXIT_MARGIN_IN_HZ 4
/* Number of consecutive frames to check before entering/exiting fixed refresh*/
#define FIXED_REFRESH_ENTER_FRAME_COUNT 5
#define FIXED_REFRESH_EXIT_FRAME_COUNT 5

struct core_freesync {
	struct mod_freesync public;
	struct dc *dc;
};

#define MOD_FREESYNC_TO_CORE(mod_freesync)\
		container_of(mod_freesync, struct core_freesync, public)

struct mod_freesync *mod_freesync_create(struct dc *dc)
{
	struct core_freesync *core_freesync =
			kzalloc(sizeof(struct core_freesync), GFP_KERNEL);

	if (core_freesync == NULL)
		goto fail_alloc_context;

	if (dc == NULL)
		goto fail_construct;

	core_freesync->dc = dc;
	return &core_freesync->public;

fail_construct:
	kfree(core_freesync);

fail_alloc_context:
	return NULL;
}

void mod_freesync_destroy(struct mod_freesync *mod_freesync)
{
	struct core_freesync *core_freesync = NULL;
	if (mod_freesync == NULL)
		return;
	core_freesync = MOD_FREESYNC_TO_CORE(mod_freesync);
	kfree(core_freesync);
}

#if 0 /* unused currently */
static unsigned int calc_refresh_in_uhz_from_duration(
		unsigned int duration_in_ns)
{
	unsigned int refresh_in_uhz =
			((unsigned int)(div64_u64((1000000000ULL * 1000000),
					duration_in_ns)));
	return refresh_in_uhz;
}
#endif

static unsigned int calc_duration_in_us_from_refresh_in_uhz(
		unsigned int refresh_in_uhz)
{
	unsigned int duration_in_us =
			((unsigned int)(div64_u64((1000000000ULL * 1000),
					refresh_in_uhz)));
	return duration_in_us;
}

static unsigned int calc_duration_in_us_from_v_total(
		const struct dc_stream_state *stream,
		const struct mod_vrr_params *in_vrr,
		unsigned int v_total)
{
	unsigned int duration_in_us =
			(unsigned int)(div64_u64(((unsigned long long)(v_total)
				* 1000) * stream->timing.h_total,
					stream->timing.pix_clk_khz));

	return duration_in_us;
}

static unsigned int calc_v_total_from_refresh(
		const struct dc_stream_state *stream,
		unsigned int refresh_in_uhz)
{
	unsigned int v_total = stream->timing.v_total;
	unsigned int frame_duration_in_ns;

	frame_duration_in_ns =
			((unsigned int)(div64_u64((1000000000ULL * 1000000),
					refresh_in_uhz)));

	v_total = div64_u64(div64_u64(((unsigned long long)(
			frame_duration_in_ns) * stream->timing.pix_clk_khz),
			stream->timing.h_total), 1000000);

	/* v_total cannot be less than nominal */
	if (v_total < stream->timing.v_total) {
		ASSERT(v_total < stream->timing.v_total);
		v_total = stream->timing.v_total;
	}

	return v_total;
}

static unsigned int calc_v_total_from_duration(
		const struct dc_stream_state *stream,
		const struct mod_vrr_params *vrr,
		unsigned int duration_in_us)
{
	unsigned int v_total = 0;

	if (duration_in_us < vrr->min_duration_in_us)
		duration_in_us = vrr->min_duration_in_us;

	if (duration_in_us > vrr->max_duration_in_us)
		duration_in_us = vrr->max_duration_in_us;

	v_total = div64_u64(div64_u64(((unsigned long long)(
				duration_in_us) * stream->timing.pix_clk_khz),
				stream->timing.h_total), 1000);

	/* v_total cannot be less than nominal */
	if (v_total < stream->timing.v_total) {
		ASSERT(v_total < stream->timing.v_total);
		v_total = stream->timing.v_total;
	}

	return v_total;
}

static void update_v_total_for_static_ramp(
		struct core_freesync *core_freesync,
		const struct dc_stream_state *stream,
		struct mod_vrr_params *in_out_vrr)
{
	unsigned int v_total = 0;
	unsigned int current_duration_in_us =
			calc_duration_in_us_from_v_total(
				stream, in_out_vrr,
				in_out_vrr->adjust.v_total_max);
	unsigned int target_duration_in_us =
			calc_duration_in_us_from_refresh_in_uhz(
				in_out_vrr->fixed.target_refresh_in_uhz);
	bool ramp_direction_is_up = (current_duration_in_us >
				target_duration_in_us) ? true : false;

	/* Calc ratio between new and current frame duration with 3 digit */
	unsigned int frame_duration_ratio = div64_u64(1000000,
		(1000 +  div64_u64(((unsigned long long)(
		STATIC_SCREEN_RAMP_DELTA_REFRESH_RATE_PER_FRAME) *
		current_duration_in_us),
		1000000)));

	/* Calculate delta between new and current frame duration in us */
	unsigned int frame_duration_delta = div64_u64(((unsigned long long)(
		current_duration_in_us) *
		(1000 - frame_duration_ratio)), 1000);

	/* Adjust frame duration delta based on ratio between current and
	 * standard frame duration (frame duration at 60 Hz refresh rate).
	 */
	unsigned int ramp_rate_interpolated = div64_u64(((unsigned long long)(
		frame_duration_delta) * current_duration_in_us), 16666);

	/* Going to a higher refresh rate (lower frame duration) */
	if (ramp_direction_is_up) {
		/* reduce frame duration */
		current_duration_in_us -= ramp_rate_interpolated;

		/* adjust for frame duration below min */
		if (current_duration_in_us <= target_duration_in_us) {
			in_out_vrr->fixed.ramping_active = false;
			in_out_vrr->fixed.ramping_done = true;
			current_duration_in_us =
				calc_duration_in_us_from_refresh_in_uhz(
				in_out_vrr->fixed.target_refresh_in_uhz);
		}
	/* Going to a lower refresh rate (larger frame duration) */
	} else {
		/* increase frame duration */
		current_duration_in_us += ramp_rate_interpolated;

		/* adjust for frame duration above max */
		if (current_duration_in_us >= target_duration_in_us) {
			in_out_vrr->fixed.ramping_active = false;
			in_out_vrr->fixed.ramping_done = true;
			current_duration_in_us =
				calc_duration_in_us_from_refresh_in_uhz(
				in_out_vrr->fixed.target_refresh_in_uhz);
		}
	}

	v_total = div64_u64(div64_u64(((unsigned long long)(
			current_duration_in_us) * stream->timing.pix_clk_khz),
				stream->timing.h_total), 1000);

	in_out_vrr->adjust.v_total_min = v_total;
	in_out_vrr->adjust.v_total_max = v_total;
}

static void apply_below_the_range(struct core_freesync *core_freesync,
		const struct dc_stream_state *stream,
		unsigned int last_render_time_in_us,
		struct mod_vrr_params *in_out_vrr)
{
	unsigned int inserted_frame_duration_in_us = 0;
	unsigned int mid_point_frames_ceil = 0;
	unsigned int mid_point_frames_floor = 0;
	unsigned int frame_time_in_us = 0;
	unsigned int delta_from_mid_point_in_us_1 = 0xFFFFFFFF;
	unsigned int delta_from_mid_point_in_us_2 = 0xFFFFFFFF;
	unsigned int frames_to_insert = 0;
	unsigned int min_frame_duration_in_ns = 0;
	unsigned int max_render_time_in_us = in_out_vrr->max_duration_in_us;

	min_frame_duration_in_ns = ((unsigned int) (div64_u64(
		(1000000000ULL * 1000000),
		in_out_vrr->max_refresh_in_uhz)));

	/* Program BTR */
	if (last_render_time_in_us + BTR_EXIT_MARGIN < max_render_time_in_us) {
		/* Exit Below the Range */
		if (in_out_vrr->btr.btr_active) {
			in_out_vrr->btr.frame_counter = 0;
			in_out_vrr->btr.btr_active = false;
		}
	} else if (last_render_time_in_us > max_render_time_in_us) {
		/* Enter Below the Range */
		in_out_vrr->btr.btr_active = true;
	}

	/* BTR set to "not active" so disengage */
	if (!in_out_vrr->btr.btr_active) {
		in_out_vrr->btr.inserted_duration_in_us = 0;
		in_out_vrr->btr.frames_to_insert = 0;
		in_out_vrr->btr.frame_counter = 0;

		/* Restore FreeSync */
		in_out_vrr->adjust.v_total_min =
			calc_v_total_from_refresh(stream,
				in_out_vrr->max_refresh_in_uhz);
		in_out_vrr->adjust.v_total_max =
			calc_v_total_from_refresh(stream,
				in_out_vrr->min_refresh_in_uhz);
	/* BTR set to "active" so engage */
	} else {

		/* Calculate number of midPoint frames that could fit within
		 * the render time interval- take ceil of this value
		 */
		mid_point_frames_ceil = (last_render_time_in_us +
				in_out_vrr->btr.mid_point_in_us - 1) /
					in_out_vrr->btr.mid_point_in_us;

		if (mid_point_frames_ceil > 0) {
			frame_time_in_us = last_render_time_in_us /
				mid_point_frames_ceil;
			delta_from_mid_point_in_us_1 =
				(in_out_vrr->btr.mid_point_in_us >
				frame_time_in_us) ?
				(in_out_vrr->btr.mid_point_in_us - frame_time_in_us) :
				(frame_time_in_us - in_out_vrr->btr.mid_point_in_us);
		}

		/* Calculate number of midPoint frames that could fit within
		 * the render time interval- take floor of this value
		 */
		mid_point_frames_floor = last_render_time_in_us /
				in_out_vrr->btr.mid_point_in_us;

		if (mid_point_frames_floor > 0) {

			frame_time_in_us = last_render_time_in_us /
				mid_point_frames_floor;
			delta_from_mid_point_in_us_2 =
				(in_out_vrr->btr.mid_point_in_us >
				frame_time_in_us) ?
				(in_out_vrr->btr.mid_point_in_us - frame_time_in_us) :
				(frame_time_in_us - in_out_vrr->btr.mid_point_in_us);
		}

		/* Choose number of frames to insert based on how close it
		 * can get to the mid point of the variable range.
		 */
		if (delta_from_mid_point_in_us_1 < delta_from_mid_point_in_us_2)
			frames_to_insert = mid_point_frames_ceil;
		else
			frames_to_insert = mid_point_frames_floor;

		/* Either we've calculated the number of frames to insert,
		 * or we need to insert min duration frames
		 */
		if (frames_to_insert > 0)
			inserted_frame_duration_in_us = last_render_time_in_us /
							frames_to_insert;

		if (inserted_frame_duration_in_us <
			(1000000 / in_out_vrr->max_refresh_in_uhz))
			inserted_frame_duration_in_us =
				(1000000 / in_out_vrr->max_refresh_in_uhz);

		/* Cache the calculated variables */
		in_out_vrr->btr.inserted_duration_in_us =
			inserted_frame_duration_in_us;
		in_out_vrr->btr.frames_to_insert = frames_to_insert;
		in_out_vrr->btr.frame_counter = frames_to_insert;
	}
}

static void apply_fixed_refresh(struct core_freesync *core_freesync,
		const struct dc_stream_state *stream,
		unsigned int last_render_time_in_us,
		struct mod_vrr_params *in_out_vrr)
{
	bool update = false;
	unsigned int max_render_time_in_us = in_out_vrr->max_duration_in_us;

	//Compute the exit refresh rate and exit frame duration
	unsigned int exit_refresh_rate_in_milli_hz = ((1000000000/max_render_time_in_us)
			+ (1000*FIXED_REFRESH_EXIT_MARGIN_IN_HZ));
	unsigned int exit_frame_duration_in_us = 1000000000/exit_refresh_rate_in_milli_hz;

	if (last_render_time_in_us < exit_frame_duration_in_us) {
		/* Exit Fixed Refresh mode */
		if (in_out_vrr->fixed.fixed_active) {
			in_out_vrr->fixed.frame_counter++;

			if (in_out_vrr->fixed.frame_counter >
					FIXED_REFRESH_EXIT_FRAME_COUNT) {
				in_out_vrr->fixed.frame_counter = 0;
				in_out_vrr->fixed.fixed_active = false;
				in_out_vrr->fixed.target_refresh_in_uhz = 0;
				update = true;
			}
		}
	} else if (last_render_time_in_us > max_render_time_in_us) {
		/* Enter Fixed Refresh mode */
		if (!in_out_vrr->fixed.fixed_active) {
			in_out_vrr->fixed.frame_counter++;

			if (in_out_vrr->fixed.frame_counter >
					FIXED_REFRESH_ENTER_FRAME_COUNT) {
				in_out_vrr->fixed.frame_counter = 0;
				in_out_vrr->fixed.fixed_active = true;
				in_out_vrr->fixed.target_refresh_in_uhz =
						in_out_vrr->max_refresh_in_uhz;
				update = true;
			}
		}
	}

	if (update) {
		if (in_out_vrr->fixed.fixed_active) {
			in_out_vrr->adjust.v_total_min =
				calc_v_total_from_refresh(
				stream, in_out_vrr->max_refresh_in_uhz);
			in_out_vrr->adjust.v_total_max =
					in_out_vrr->adjust.v_total_min;
		} else {
			in_out_vrr->adjust.v_total_min =
				calc_v_total_from_refresh(stream,
					in_out_vrr->max_refresh_in_uhz);
			in_out_vrr->adjust.v_total_max =
				calc_v_total_from_refresh(stream,
					in_out_vrr->min_refresh_in_uhz);
		}
	}
}

static bool vrr_settings_require_update(struct core_freesync *core_freesync,
		struct mod_freesync_config *in_config,
		unsigned int min_refresh_in_uhz,
		unsigned int max_refresh_in_uhz,
		struct mod_vrr_params *in_vrr)
{
	if (in_vrr->state != in_config->state) {
		return true;
	} else if (in_vrr->state == VRR_STATE_ACTIVE_FIXED &&
			in_vrr->fixed.target_refresh_in_uhz !=
					in_config->min_refresh_in_uhz) {
		return true;
	} else if (in_vrr->min_refresh_in_uhz != min_refresh_in_uhz) {
		return true;
	} else if (in_vrr->max_refresh_in_uhz != max_refresh_in_uhz) {
		return true;
	}

	return false;
}

bool mod_freesync_get_vmin_vmax(struct mod_freesync *mod_freesync,
		const struct dc_stream_state *stream,
		unsigned int *vmin,
		unsigned int *vmax)
{
	*vmin = stream->adjust.v_total_min;
	*vmax = stream->adjust.v_total_max;

	return true;
}

bool mod_freesync_get_v_position(struct mod_freesync *mod_freesync,
		struct dc_stream_state *stream,
		unsigned int *nom_v_pos,
		unsigned int *v_pos)
{
	struct core_freesync *core_freesync = NULL;
	struct crtc_position position;

	if (mod_freesync == NULL)
		return false;

	core_freesync = MOD_FREESYNC_TO_CORE(mod_freesync);

	if (dc_stream_get_crtc_position(core_freesync->dc, &stream, 1,
					&position.vertical_count,
					&position.nominal_vcount)) {

		*nom_v_pos = position.nominal_vcount;
		*v_pos = position.vertical_count;

		return true;
	}

	return false;
}

static void build_vrr_infopacket_header_v1(enum signal_type signal,
		struct dc_info_packet *infopacket,
		unsigned int *payload_size)
{
	if (dc_is_hdmi_signal(signal)) {

		/* HEADER */

		/* HB0  = Packet Type = 0x83 (Source Product
		 *	  Descriptor InfoFrame)
		 */
		infopacket->hb0 = DC_HDMI_INFOFRAME_TYPE_SPD;

		/* HB1  = Version = 0x01 */
		infopacket->hb1 = 0x01;

		/* HB2  = [Bits 7:5 = 0] [Bits 4:0 = Length = 0x08] */
		infopacket->hb2 = 0x08;

		*payload_size = 0x08;

	} else if (dc_is_dp_signal(signal)) {

		/* HEADER */

		/* HB0  = Secondary-data Packet ID = 0 - Only non-zero
		 *	  when used to associate audio related info packets
		 */
		infopacket->hb0 = 0x00;

		/* HB1  = Packet Type = 0x83 (Source Product
		 *	  Descriptor InfoFrame)
		 */
		infopacket->hb1 = DC_HDMI_INFOFRAME_TYPE_SPD;

		/* HB2  = [Bits 7:0 = Least significant eight bits -
		 *	  For INFOFRAME, the value must be 1Bh]
		 */
		infopacket->hb2 = 0x1B;

		/* HB3  = [Bits 7:2 = INFOFRAME SDP Version Number = 0x1]
		 *	  [Bits 1:0 = Most significant two bits = 0x00]
		 */
		infopacket->hb3 = 0x04;

		*payload_size = 0x1B;
	}
}

static void build_vrr_infopacket_header_v2(enum signal_type signal,
		struct dc_info_packet *infopacket,
		unsigned int *payload_size)
{
	if (dc_is_hdmi_signal(signal)) {

		/* HEADER */

		/* HB0  = Packet Type = 0x83 (Source Product
		 *	  Descriptor InfoFrame)
		 */
		infopacket->hb0 = DC_HDMI_INFOFRAME_TYPE_SPD;

		/* HB1  = Version = 0x02 */
		infopacket->hb1 = 0x02;

		/* HB2  = [Bits 7:5 = 0] [Bits 4:0 = Length = 0x09] */
		infopacket->hb2 = 0x09;

		*payload_size = 0x0A;

	} else if (dc_is_dp_signal(signal)) {

		/* HEADER */

		/* HB0  = Secondary-data Packet ID = 0 - Only non-zero
		 *	  when used to associate audio related info packets
		 */
		infopacket->hb0 = 0x00;

		/* HB1  = Packet Type = 0x83 (Source Product
		 *	  Descriptor InfoFrame)
		 */
		infopacket->hb1 = DC_HDMI_INFOFRAME_TYPE_SPD;

		/* HB2  = [Bits 7:0 = Least significant eight bits -
		 *	  For INFOFRAME, the value must be 1Bh]
		 */
		infopacket->hb2 = 0x1B;

		/* HB3  = [Bits 7:2 = INFOFRAME SDP Version Number = 0x2]
		 *	  [Bits 1:0 = Most significant two bits = 0x00]
		 */
		infopacket->hb3 = 0x08;

		*payload_size = 0x1B;
	}
}

static void build_vrr_infopacket_data(const struct mod_vrr_params *vrr,
		struct dc_info_packet *infopacket)
{
	/* PB1 = 0x1A (24bit AMD IEEE OUI (0x00001A) - Byte 0) */
	infopacket->sb[1] = 0x1A;

	/* PB2 = 0x00 (24bit AMD IEEE OUI (0x00001A) - Byte 1) */
	infopacket->sb[2] = 0x00;

	/* PB3 = 0x00 (24bit AMD IEEE OUI (0x00001A) - Byte 2) */
	infopacket->sb[3] = 0x00;

	/* PB4 = Reserved */

	/* PB5 = Reserved */

	/* PB6 = [Bits 7:3 = Reserved] */

	/* PB6 = [Bit 0 = FreeSync Supported] */
	if (vrr->state != VRR_STATE_UNSUPPORTED)
		infopacket->sb[6] |= 0x01;

	/* PB6 = [Bit 1 = FreeSync Enabled] */
	if (vrr->state != VRR_STATE_DISABLED &&
			vrr->state != VRR_STATE_UNSUPPORTED)
		infopacket->sb[6] |= 0x02;

	/* PB6 = [Bit 2 = FreeSync Active] */
	if (vrr->state == VRR_STATE_ACTIVE_VARIABLE ||
			vrr->state == VRR_STATE_ACTIVE_FIXED)
		infopacket->sb[6] |= 0x04;

	/* PB7 = FreeSync Minimum refresh rate (Hz) */
	infopacket->sb[7] = (unsigned char)(vrr->min_refresh_in_uhz / 1000000);

	/* PB8 = FreeSync Maximum refresh rate (Hz)
	 * Note: We should never go above the field rate of the mode timing set.
	 */
	infopacket->sb[8] = (unsigned char)(vrr->max_refresh_in_uhz / 1000000);


	//FreeSync HDR
	infopacket->sb[9] = 0;
	infopacket->sb[10] = 0;
}

static void build_vrr_infopacket_fs2_data(enum color_transfer_func app_tf,
		struct dc_info_packet *infopacket)
{
	if (app_tf != TRANSFER_FUNC_UNKNOWN) {
		infopacket->valid = true;

		infopacket->sb[6] |= 0x08;  // PB6 = [Bit 3 = Native Color Active]

		if (app_tf == TRANSFER_FUNC_GAMMA_22) {
			infopacket->sb[9] |= 0x04;  // PB6 = [Bit 2 = Gamma 2.2 EOTF Active]
		}
	}
}

static void build_vrr_infopacket_checksum(unsigned int *payload_size,
		struct dc_info_packet *infopacket)
{
	/* Calculate checksum */
	unsigned int idx = 0;
	unsigned char checksum = 0;

	checksum += infopacket->hb0;
	checksum += infopacket->hb1;
	checksum += infopacket->hb2;
	checksum += infopacket->hb3;

	for (idx = 1; idx <= *payload_size; idx++)
		checksum += infopacket->sb[idx];

	/* PB0 = Checksum (one byte complement) */
	infopacket->sb[0] = (unsigned char)(0x100 - checksum);

	infopacket->valid = true;
}

static void build_vrr_infopacket_v1(enum signal_type signal,
		const struct mod_vrr_params *vrr,
		struct dc_info_packet *infopacket)
{
	/* SPD info packet for FreeSync */
	unsigned int payload_size = 0;

	build_vrr_infopacket_header_v1(signal, infopacket, &payload_size);
	build_vrr_infopacket_data(vrr, infopacket);
	build_vrr_infopacket_checksum(&payload_size, infopacket);

	infopacket->valid = true;
}

static void build_vrr_infopacket_v2(enum signal_type signal,
		const struct mod_vrr_params *vrr,
		const enum color_transfer_func *app_tf,
		struct dc_info_packet *infopacket)
{
	unsigned int payload_size = 0;

	build_vrr_infopacket_header_v2(signal, infopacket, &payload_size);
	build_vrr_infopacket_data(vrr, infopacket);

	if (app_tf != NULL)
		build_vrr_infopacket_fs2_data(*app_tf, infopacket);

	build_vrr_infopacket_checksum(&payload_size, infopacket);

	infopacket->valid = true;
}

void mod_freesync_build_vrr_infopacket(struct mod_freesync *mod_freesync,
		const struct dc_stream_state *stream,
		const struct mod_vrr_params *vrr,
		enum vrr_packet_type packet_type,
		const enum color_transfer_func *app_tf,
		struct dc_info_packet *infopacket)
{
	/* SPD info packet for FreeSync */

	/* Check if Freesync is supported. Return if false. If true,
	 * set the corresponding bit in the info packet
	 */
	if (!vrr->supported || !vrr->send_vsif)
		return;

	switch (packet_type) {
	case PACKET_TYPE_FS2:
		build_vrr_infopacket_v2(stream->signal, vrr, app_tf, infopacket);
		break;
	case PACKET_TYPE_VRR:
	case PACKET_TYPE_FS1:
	default:
		build_vrr_infopacket_v1(stream->signal, vrr, infopacket);
	}
}

void mod_freesync_build_vrr_params(struct mod_freesync *mod_freesync,
		const struct dc_stream_state *stream,
		struct mod_freesync_config *in_config,
		struct mod_vrr_params *in_out_vrr)
{
	struct core_freesync *core_freesync = NULL;
	unsigned long long nominal_field_rate_in_uhz = 0;
	unsigned int refresh_range = 0;
	unsigned int min_refresh_in_uhz = 0;
	unsigned int max_refresh_in_uhz = 0;

	if (mod_freesync == NULL)
		return;

	core_freesync = MOD_FREESYNC_TO_CORE(mod_freesync);

	/* Calculate nominal field rate for stream */
	nominal_field_rate_in_uhz =
			mod_freesync_calc_nominal_field_rate(stream);

	min_refresh_in_uhz = in_config->min_refresh_in_uhz;
	max_refresh_in_uhz = in_config->max_refresh_in_uhz;

	// Don't allow min > max
	if (min_refresh_in_uhz > max_refresh_in_uhz)
		min_refresh_in_uhz = max_refresh_in_uhz;

	// Full range may be larger than current video timing, so cap at nominal
	if (max_refresh_in_uhz > nominal_field_rate_in_uhz)
		max_refresh_in_uhz = nominal_field_rate_in_uhz;

	// Full range may be larger than current video timing, so cap at nominal
	if (min_refresh_in_uhz > nominal_field_rate_in_uhz)
		min_refresh_in_uhz = nominal_field_rate_in_uhz;

	if (!vrr_settings_require_update(core_freesync,
			in_config, min_refresh_in_uhz, max_refresh_in_uhz,
			in_out_vrr))
		return;

	in_out_vrr->state = in_config->state;
	in_out_vrr->send_vsif = in_config->vsif_supported;

	if (in_config->state == VRR_STATE_UNSUPPORTED) {
		in_out_vrr->state = VRR_STATE_UNSUPPORTED;
		in_out_vrr->supported = false;
		in_out_vrr->adjust.v_total_min = stream->timing.v_total;
		in_out_vrr->adjust.v_total_max = stream->timing.v_total;

		return;

	} else {
		in_out_vrr->min_refresh_in_uhz = min_refresh_in_uhz;
		in_out_vrr->max_duration_in_us =
				calc_duration_in_us_from_refresh_in_uhz(
						min_refresh_in_uhz);

		in_out_vrr->max_refresh_in_uhz = max_refresh_in_uhz;
		in_out_vrr->min_duration_in_us =
				calc_duration_in_us_from_refresh_in_uhz(
						max_refresh_in_uhz);

		refresh_range = in_out_vrr->max_refresh_in_uhz -
				in_out_vrr->min_refresh_in_uhz;

		in_out_vrr->supported = true;
	}

	in_out_vrr->fixed.ramping_active = in_config->ramping;

	in_out_vrr->btr.btr_enabled = in_config->btr;
	if (in_out_vrr->max_refresh_in_uhz <
			2 * in_out_vrr->min_refresh_in_uhz)
		in_out_vrr->btr.btr_enabled = false;
	in_out_vrr->btr.btr_active = false;
	in_out_vrr->btr.inserted_duration_in_us = 0;
	in_out_vrr->btr.frames_to_insert = 0;
	in_out_vrr->btr.frame_counter = 0;
	in_out_vrr->btr.mid_point_in_us =
			in_out_vrr->min_duration_in_us +
				(in_out_vrr->max_duration_in_us -
				in_out_vrr->min_duration_in_us) / 2;

	if (in_out_vrr->state == VRR_STATE_UNSUPPORTED) {
		in_out_vrr->adjust.v_total_min = stream->timing.v_total;
		in_out_vrr->adjust.v_total_max = stream->timing.v_total;
	} else if (in_out_vrr->state == VRR_STATE_DISABLED) {
		in_out_vrr->adjust.v_total_min = stream->timing.v_total;
		in_out_vrr->adjust.v_total_max = stream->timing.v_total;
	} else if (in_out_vrr->state == VRR_STATE_INACTIVE) {
		in_out_vrr->adjust.v_total_min = stream->timing.v_total;
		in_out_vrr->adjust.v_total_max = stream->timing.v_total;
	} else if (in_out_vrr->state == VRR_STATE_ACTIVE_VARIABLE &&
			refresh_range >= MIN_REFRESH_RANGE_IN_US) {
		in_out_vrr->adjust.v_total_min =
			calc_v_total_from_refresh(stream,
				in_out_vrr->max_refresh_in_uhz);
		in_out_vrr->adjust.v_total_max =
			calc_v_total_from_refresh(stream,
				in_out_vrr->min_refresh_in_uhz);
	} else if (in_out_vrr->state == VRR_STATE_ACTIVE_FIXED) {
		in_out_vrr->fixed.target_refresh_in_uhz =
				in_out_vrr->min_refresh_in_uhz;
		if (in_out_vrr->fixed.ramping_active &&
				in_out_vrr->fixed.fixed_active) {
			/* Do not update vtotals if ramping is already active
			 * in order to continue ramp from current refresh.
			 */
			in_out_vrr->fixed.fixed_active = true;
		} else {
			in_out_vrr->fixed.fixed_active = true;
			in_out_vrr->adjust.v_total_min =
				calc_v_total_from_refresh(stream,
					in_out_vrr->fixed.target_refresh_in_uhz);
			in_out_vrr->adjust.v_total_max =
				in_out_vrr->adjust.v_total_min;
		}
	} else {
		in_out_vrr->state = VRR_STATE_INACTIVE;
		in_out_vrr->adjust.v_total_min = stream->timing.v_total;
		in_out_vrr->adjust.v_total_max = stream->timing.v_total;
	}
}

void mod_freesync_handle_preflip(struct mod_freesync *mod_freesync,
		const struct dc_plane_state *plane,
		const struct dc_stream_state *stream,
		unsigned int curr_time_stamp_in_us,
		struct mod_vrr_params *in_out_vrr)
{
	struct core_freesync *core_freesync = NULL;
	unsigned int last_render_time_in_us = 0;
	unsigned int average_render_time_in_us = 0;

	if (mod_freesync == NULL)
		return;

	core_freesync = MOD_FREESYNC_TO_CORE(mod_freesync);

	if (in_out_vrr->supported &&
			in_out_vrr->state == VRR_STATE_ACTIVE_VARIABLE) {
		unsigned int i = 0;
		unsigned int oldest_index = plane->time.index + 1;

		if (oldest_index >= DC_PLANE_UPDATE_TIMES_MAX)
			oldest_index = 0;

		last_render_time_in_us = curr_time_stamp_in_us -
				plane->time.prev_update_time_in_us;

		// Sum off all entries except oldest one
		for (i = 0; i < DC_PLANE_UPDATE_TIMES_MAX; i++) {
			average_render_time_in_us +=
					plane->time.time_elapsed_in_us[i];
		}
		average_render_time_in_us -=
				plane->time.time_elapsed_in_us[oldest_index];

		// Add render time for current flip
		average_render_time_in_us += last_render_time_in_us;
		average_render_time_in_us /= DC_PLANE_UPDATE_TIMES_MAX;

		if (in_out_vrr->btr.btr_enabled) {
			apply_below_the_range(core_freesync,
					stream,
					last_render_time_in_us,
					in_out_vrr);
		} else {
			apply_fixed_refresh(core_freesync,
				stream,
				last_render_time_in_us,
				in_out_vrr);
		}

	}
}

void mod_freesync_handle_v_update(struct mod_freesync *mod_freesync,
		const struct dc_stream_state *stream,
		struct mod_vrr_params *in_out_vrr)
{
	struct core_freesync *core_freesync = NULL;

	if ((mod_freesync == NULL) || (stream == NULL) || (in_out_vrr == NULL))
		return;

	core_freesync = MOD_FREESYNC_TO_CORE(mod_freesync);

	if (in_out_vrr->supported == false)
		return;

	/* Below the Range Logic */

	/* Only execute if in fullscreen mode */
	if (in_out_vrr->state == VRR_STATE_ACTIVE_VARIABLE &&
					in_out_vrr->btr.btr_active) {
		/* TODO: pass in flag for Pre-DCE12 ASIC
		 * in order for frame variable duration to take affect,
		 * it needs to be done one VSYNC early, which is at
		 * frameCounter == 1.
		 * For DCE12 and newer updates to V_TOTAL_MIN/MAX
		 * will take affect on current frame
		 */
		if (in_out_vrr->btr.frames_to_insert ==
				in_out_vrr->btr.frame_counter) {
			in_out_vrr->adjust.v_total_min =
				calc_v_total_from_duration(stream,
				in_out_vrr,
				in_out_vrr->btr.inserted_duration_in_us);
			in_out_vrr->adjust.v_total_max =
				in_out_vrr->adjust.v_total_min;
		}

		if (in_out_vrr->btr.frame_counter > 0)
			in_out_vrr->btr.frame_counter--;

		/* Restore FreeSync */
		if (in_out_vrr->btr.frame_counter == 0) {
			in_out_vrr->adjust.v_total_min =
				calc_v_total_from_refresh(stream,
				in_out_vrr->max_refresh_in_uhz);
			in_out_vrr->adjust.v_total_max =
				calc_v_total_from_refresh(stream,
				in_out_vrr->min_refresh_in_uhz);
		}
	}

	/* If in fullscreen freesync mode or in video, do not program
	 * static screen ramp values
	 */
	if (in_out_vrr->state == VRR_STATE_ACTIVE_VARIABLE)
		in_out_vrr->fixed.ramping_active = false;

	/* Gradual Static Screen Ramping Logic */
	/* Execute if ramp is active and user enabled freesync static screen*/
	if (in_out_vrr->state == VRR_STATE_ACTIVE_FIXED &&
				in_out_vrr->fixed.ramping_active) {
		update_v_total_for_static_ramp(
				core_freesync, stream, in_out_vrr);
	}
}

void mod_freesync_get_settings(struct mod_freesync *mod_freesync,
		const struct mod_vrr_params *vrr,
		unsigned int *v_total_min, unsigned int *v_total_max,
		unsigned int *event_triggers,
		unsigned int *window_min, unsigned int *window_max,
		unsigned int *lfc_mid_point_in_us,
		unsigned int *inserted_frames,
		unsigned int *inserted_duration_in_us)
{
	struct core_freesync *core_freesync = NULL;

	if (mod_freesync == NULL)
		return;

	core_freesync = MOD_FREESYNC_TO_CORE(mod_freesync);

	if (vrr->supported) {
		*v_total_min = vrr->adjust.v_total_min;
		*v_total_max = vrr->adjust.v_total_max;
		*event_triggers = 0;
		*lfc_mid_point_in_us = vrr->btr.mid_point_in_us;
		*inserted_frames = vrr->btr.frames_to_insert;
		*inserted_duration_in_us = vrr->btr.inserted_duration_in_us;
	}
}

unsigned long long mod_freesync_calc_nominal_field_rate(
			const struct dc_stream_state *stream)
{
	unsigned long long nominal_field_rate_in_uhz = 0;

	/* Calculate nominal field rate for stream */
	nominal_field_rate_in_uhz = stream->timing.pix_clk_khz;
	nominal_field_rate_in_uhz *= 1000ULL * 1000ULL * 1000ULL;
	nominal_field_rate_in_uhz = div_u64(nominal_field_rate_in_uhz,
						stream->timing.h_total);
	nominal_field_rate_in_uhz = div_u64(nominal_field_rate_in_uhz,
						stream->timing.v_total);

	return nominal_field_rate_in_uhz;
}

bool mod_freesync_is_valid_range(struct mod_freesync *mod_freesync,
		const struct dc_stream_state *stream,
		uint32_t min_refresh_cap_in_uhz,
		uint32_t max_refresh_cap_in_uhz,
		uint32_t min_refresh_request_in_uhz,
		uint32_t max_refresh_request_in_uhz)
{
	/* Calculate nominal field rate for stream */
	unsigned long long nominal_field_rate_in_uhz =
			mod_freesync_calc_nominal_field_rate(stream);

	/* Typically nominal refresh calculated can have some fractional part.
	 * Allow for some rounding error of actual video timing by taking floor
	 * of caps and request. Round the nominal refresh rate.
	 *
	 * Dividing will convert everything to units in Hz although input
	 * variable name is in uHz!
	 *
	 * Also note, this takes care of rounding error on the nominal refresh
	 * so by rounding error we only expect it to be off by a small amount,
	 * such as < 0.1 Hz. i.e. 143.9xxx or 144.1xxx.
	 *
	 * Example 1. Caps    Min = 40 Hz, Max = 144 Hz
	 *            Request Min = 40 Hz, Max = 144 Hz
	 *                    Nominal = 143.5x Hz rounded to 144 Hz
	 *            This function should allow this as valid request
	 *
	 * Example 2. Caps    Min = 40 Hz, Max = 144 Hz
	 *            Request Min = 40 Hz, Max = 144 Hz
	 *                    Nominal = 144.4x Hz rounded to 144 Hz
	 *            This function should allow this as valid request
	 *
	 * Example 3. Caps    Min = 40 Hz, Max = 144 Hz
	 *            Request Min = 40 Hz, Max = 144 Hz
	 *                    Nominal = 120.xx Hz rounded to 120 Hz
	 *            This function should return NOT valid since the requested
	 *            max is greater than current timing's nominal
	 *
	 * Example 4. Caps    Min = 40 Hz, Max = 120 Hz
	 *            Request Min = 40 Hz, Max = 120 Hz
	 *                    Nominal = 144.xx Hz rounded to 144 Hz
	 *            This function should return NOT valid since the nominal
	 *            is greater than the capability's max refresh
	 */
	nominal_field_rate_in_uhz =
			div_u64(nominal_field_rate_in_uhz + 500000, 1000000);
	min_refresh_cap_in_uhz /= 1000000;
	max_refresh_cap_in_uhz /= 1000000;
	min_refresh_request_in_uhz /= 1000000;
	max_refresh_request_in_uhz /= 1000000;

	// Check nominal is within range
	if (nominal_field_rate_in_uhz > max_refresh_cap_in_uhz ||
		nominal_field_rate_in_uhz < min_refresh_cap_in_uhz)
		return false;

	// If nominal is less than max, limit the max allowed refresh rate
	if (nominal_field_rate_in_uhz < max_refresh_cap_in_uhz)
		max_refresh_cap_in_uhz = nominal_field_rate_in_uhz;

	// Don't allow min > max
	if (min_refresh_request_in_uhz > max_refresh_request_in_uhz)
		return false;

	// Check min is within range
	if (min_refresh_request_in_uhz > max_refresh_cap_in_uhz ||
		min_refresh_request_in_uhz < min_refresh_cap_in_uhz)
		return false;

	// Check max is within range
	if (max_refresh_request_in_uhz > max_refresh_cap_in_uhz ||
		max_refresh_request_in_uhz < min_refresh_cap_in_uhz)
		return false;

	// For variable range, check for at least 10 Hz range
	if ((max_refresh_request_in_uhz != min_refresh_request_in_uhz) &&
		(max_refresh_request_in_uhz - min_refresh_request_in_uhz < 10))
		return false;

	return true;
}