summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/msm/dp/dp_ctrl.c
blob: ee221d835fa0b97e73cf7ce7e5d85980a5e8a9b1 (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
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2012-2020, The Linux Foundation. All rights reserved.
 */

#define pr_fmt(fmt)	"[drm-dp] %s: " fmt, __func__

#include <linux/types.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/phy/phy.h>
#include <linux/phy/phy-dp.h>
#include <linux/pm_opp.h>
#include <drm/drm_fixed.h>
#include <drm/drm_dp_helper.h>
#include <drm/drm_print.h>

#include "dp_reg.h"
#include "dp_ctrl.h"
#include "dp_link.h"

#define DP_KHZ_TO_HZ 1000
#define IDLE_PATTERN_COMPLETION_TIMEOUT_JIFFIES	(30 * HZ / 1000) /* 30 ms */
#define WAIT_FOR_VIDEO_READY_TIMEOUT_JIFFIES (HZ / 2)

#define DP_CTRL_INTR_READY_FOR_VIDEO     BIT(0)
#define DP_CTRL_INTR_IDLE_PATTERN_SENT  BIT(3)

#define MR_LINK_TRAINING1  0x8
#define MR_LINK_SYMBOL_ERM 0x80
#define MR_LINK_PRBS7 0x100
#define MR_LINK_CUSTOM80 0x200
#define MR_LINK_TRAINING4  0x40

enum {
	DP_TRAINING_NONE,
	DP_TRAINING_1,
	DP_TRAINING_2,
};

struct dp_tu_calc_input {
	u64 lclk;        /* 162, 270, 540 and 810 */
	u64 pclk_khz;    /* in KHz */
	u64 hactive;     /* active h-width */
	u64 hporch;      /* bp + fp + pulse */
	int nlanes;      /* no.of.lanes */
	int bpp;         /* bits */
	int pixel_enc;   /* 444, 420, 422 */
	int dsc_en;     /* dsc on/off */
	int async_en;   /* async mode */
	int fec_en;     /* fec */
	int compress_ratio; /* 2:1 = 200, 3:1 = 300, 3.75:1 = 375 */
	int num_of_dsc_slices; /* number of slices per line */
};

struct dp_vc_tu_mapping_table {
	u32 vic;
	u8 lanes;
	u8 lrate; /* DP_LINK_RATE -> 162(6), 270(10), 540(20), 810 (30) */
	u8 bpp;
	u8 valid_boundary_link;
	u16 delay_start_link;
	bool boundary_moderation_en;
	u8 valid_lower_boundary_link;
	u8 upper_boundary_count;
	u8 lower_boundary_count;
	u8 tu_size_minus1;
};

struct dp_ctrl_private {
	struct dp_ctrl dp_ctrl;
	struct device *dev;
	struct drm_dp_aux *aux;
	struct dp_panel *panel;
	struct dp_link *link;
	struct dp_power *power;
	struct dp_parser *parser;
	struct dp_catalog *catalog;

	struct completion idle_comp;
	struct completion video_comp;
};

struct dp_cr_status {
	u8 lane_0_1;
	u8 lane_2_3;
};

#define DP_LANE0_1_CR_DONE	0x11

static int dp_aux_link_configure(struct drm_dp_aux *aux,
					struct dp_link_info *link)
{
	u8 values[2];
	int err;

	values[0] = drm_dp_link_rate_to_bw_code(link->rate);
	values[1] = link->num_lanes;

	if (link->capabilities & DP_LINK_CAP_ENHANCED_FRAMING)
		values[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;

	err = drm_dp_dpcd_write(aux, DP_LINK_BW_SET, values, sizeof(values));
	if (err < 0)
		return err;

	return 0;
}

void dp_ctrl_push_idle(struct dp_ctrl *dp_ctrl)
{
	struct dp_ctrl_private *ctrl;

	ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);

	reinit_completion(&ctrl->idle_comp);
	dp_catalog_ctrl_state_ctrl(ctrl->catalog, DP_STATE_CTRL_PUSH_IDLE);

	if (!wait_for_completion_timeout(&ctrl->idle_comp,
			IDLE_PATTERN_COMPLETION_TIMEOUT_JIFFIES))
		pr_warn("PUSH_IDLE pattern timedout\n");

	pr_debug("mainlink off done\n");
}

static void dp_ctrl_config_ctrl(struct dp_ctrl_private *ctrl)
{
	u32 config = 0, tbd;
	u8 *dpcd = ctrl->panel->dpcd;

	/* Default-> LSCLK DIV: 1/4 LCLK  */
	config |= (2 << DP_CONFIGURATION_CTRL_LSCLK_DIV_SHIFT);

	/* Scrambler reset enable */
	if (dpcd[DP_EDP_CONFIGURATION_CAP] & DP_ALTERNATE_SCRAMBLER_RESET_CAP)
		config |= DP_CONFIGURATION_CTRL_ASSR;

	tbd = dp_link_get_test_bits_depth(ctrl->link,
			ctrl->panel->dp_mode.bpp);

	if (tbd == DP_TEST_BIT_DEPTH_UNKNOWN) {
		pr_debug("BIT_DEPTH not set. Configure default\n");
		tbd = DP_TEST_BIT_DEPTH_8;
	}

	config |= tbd << DP_CONFIGURATION_CTRL_BPC_SHIFT;

	/* Num of Lanes */
	config |= ((ctrl->link->link_params.num_lanes - 1)
			<< DP_CONFIGURATION_CTRL_NUM_OF_LANES_SHIFT);

	if (drm_dp_enhanced_frame_cap(dpcd))
		config |= DP_CONFIGURATION_CTRL_ENHANCED_FRAMING;

	config |= DP_CONFIGURATION_CTRL_P_INTERLACED; /* progressive video */

	/* sync clock & static Mvid */
	config |= DP_CONFIGURATION_CTRL_STATIC_DYNAMIC_CN;
	config |= DP_CONFIGURATION_CTRL_SYNC_ASYNC_CLK;

	dp_catalog_ctrl_config_ctrl(ctrl->catalog, config);
}

static void dp_ctrl_configure_source_params(struct dp_ctrl_private *ctrl)
{
	u32 cc, tb;

	dp_catalog_ctrl_lane_mapping(ctrl->catalog);
	dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, true);

	dp_ctrl_config_ctrl(ctrl);

	tb = dp_link_get_test_bits_depth(ctrl->link,
		ctrl->panel->dp_mode.bpp);
	cc = dp_link_get_colorimetry_config(ctrl->link);
	dp_catalog_ctrl_config_misc(ctrl->catalog, cc, tb);
	dp_panel_timing_cfg(ctrl->panel);
}

/*
 * The structure and few functions present below are IP/Hardware
 * specific implementation. Most of the implementation will not
 * have coding comments
 */
struct tu_algo_data {
	s64 lclk_fp;
	s64 pclk_fp;
	s64 lwidth;
	s64 lwidth_fp;
	s64 hbp_relative_to_pclk;
	s64 hbp_relative_to_pclk_fp;
	int nlanes;
	int bpp;
	int pixelEnc;
	int dsc_en;
	int async_en;
	int bpc;

	uint delay_start_link_extra_pixclk;
	int extra_buffer_margin;
	s64 ratio_fp;
	s64 original_ratio_fp;

	s64 err_fp;
	s64 n_err_fp;
	s64 n_n_err_fp;
	int tu_size;
	int tu_size_desired;
	int tu_size_minus1;

	int valid_boundary_link;
	s64 resulting_valid_fp;
	s64 total_valid_fp;
	s64 effective_valid_fp;
	s64 effective_valid_recorded_fp;
	int n_tus;
	int n_tus_per_lane;
	int paired_tus;
	int remainder_tus;
	int remainder_tus_upper;
	int remainder_tus_lower;
	int extra_bytes;
	int filler_size;
	int delay_start_link;

	int extra_pclk_cycles;
	int extra_pclk_cycles_in_link_clk;
	s64 ratio_by_tu_fp;
	s64 average_valid2_fp;
	int new_valid_boundary_link;
	int remainder_symbols_exist;
	int n_symbols;
	s64 n_remainder_symbols_per_lane_fp;
	s64 last_partial_tu_fp;
	s64 TU_ratio_err_fp;

	int n_tus_incl_last_incomplete_tu;
	int extra_pclk_cycles_tmp;
	int extra_pclk_cycles_in_link_clk_tmp;
	int extra_required_bytes_new_tmp;
	int filler_size_tmp;
	int lower_filler_size_tmp;
	int delay_start_link_tmp;

	bool boundary_moderation_en;
	int boundary_mod_lower_err;
	int upper_boundary_count;
	int lower_boundary_count;
	int i_upper_boundary_count;
	int i_lower_boundary_count;
	int valid_lower_boundary_link;
	int even_distribution_BF;
	int even_distribution_legacy;
	int even_distribution;
	int min_hblank_violated;
	s64 delay_start_time_fp;
	s64 hbp_time_fp;
	s64 hactive_time_fp;
	s64 diff_abs_fp;

	s64 ratio;
};

static int _tu_param_compare(s64 a, s64 b)
{
	u32 a_sign;
	u32 b_sign;
	s64 a_temp, b_temp, minus_1;

	if (a == b)
		return 0;

	minus_1 = drm_fixp_from_fraction(-1, 1);

	a_sign = (a >> 32) & 0x80000000 ? 1 : 0;

	b_sign = (b >> 32) & 0x80000000 ? 1 : 0;

	if (a_sign > b_sign)
		return 2;
	else if (b_sign > a_sign)
		return 1;

	if (!a_sign && !b_sign) { /* positive */
		if (a > b)
			return 1;
		else
			return 2;
	} else { /* negative */
		a_temp = drm_fixp_mul(a, minus_1);
		b_temp = drm_fixp_mul(b, minus_1);

		if (a_temp > b_temp)
			return 2;
		else
			return 1;
	}
}

static void dp_panel_update_tu_timings(struct dp_tu_calc_input *in,
					struct tu_algo_data *tu)
{
	int nlanes = in->nlanes;
	int dsc_num_slices = in->num_of_dsc_slices;
	int dsc_num_bytes  = 0;
	int numerator;
	s64 pclk_dsc_fp;
	s64 dwidth_dsc_fp;
	s64 hbp_dsc_fp;

	int tot_num_eoc_symbols = 0;
	int tot_num_hor_bytes   = 0;
	int tot_num_dummy_bytes = 0;
	int dwidth_dsc_bytes    = 0;
	int  eoc_bytes           = 0;

	s64 temp1_fp, temp2_fp, temp3_fp;

	tu->lclk_fp              = drm_fixp_from_fraction(in->lclk, 1);
	tu->pclk_fp              = drm_fixp_from_fraction(in->pclk_khz, 1000);
	tu->lwidth               = in->hactive;
	tu->hbp_relative_to_pclk = in->hporch;
	tu->nlanes               = in->nlanes;
	tu->bpp                  = in->bpp;
	tu->pixelEnc             = in->pixel_enc;
	tu->dsc_en               = in->dsc_en;
	tu->async_en             = in->async_en;
	tu->lwidth_fp            = drm_fixp_from_fraction(in->hactive, 1);
	tu->hbp_relative_to_pclk_fp = drm_fixp_from_fraction(in->hporch, 1);

	if (tu->pixelEnc == 420) {
		temp1_fp = drm_fixp_from_fraction(2, 1);
		tu->pclk_fp = drm_fixp_div(tu->pclk_fp, temp1_fp);
		tu->lwidth_fp = drm_fixp_div(tu->lwidth_fp, temp1_fp);
		tu->hbp_relative_to_pclk_fp =
				drm_fixp_div(tu->hbp_relative_to_pclk_fp, 2);
	}

	if (tu->pixelEnc == 422) {
		switch (tu->bpp) {
		case 24:
			tu->bpp = 16;
			tu->bpc = 8;
			break;
		case 30:
			tu->bpp = 20;
			tu->bpc = 10;
			break;
		default:
			tu->bpp = 16;
			tu->bpc = 8;
			break;
		}
	} else {
		tu->bpc = tu->bpp/3;
	}

	if (!in->dsc_en)
		goto fec_check;

	temp1_fp = drm_fixp_from_fraction(in->compress_ratio, 100);
	temp2_fp = drm_fixp_from_fraction(in->bpp, 1);
	temp3_fp = drm_fixp_div(temp2_fp, temp1_fp);
	temp2_fp = drm_fixp_mul(tu->lwidth_fp, temp3_fp);

	temp1_fp = drm_fixp_from_fraction(8, 1);
	temp3_fp = drm_fixp_div(temp2_fp, temp1_fp);

	numerator = drm_fixp2int(temp3_fp);

	dsc_num_bytes  = numerator / dsc_num_slices;
	eoc_bytes           = dsc_num_bytes % nlanes;
	tot_num_eoc_symbols = nlanes * dsc_num_slices;
	tot_num_hor_bytes   = dsc_num_bytes * dsc_num_slices;
	tot_num_dummy_bytes = (nlanes - eoc_bytes) * dsc_num_slices;

	if (dsc_num_bytes == 0)
		pr_info("incorrect no of bytes per slice=%d\n", dsc_num_bytes);

	dwidth_dsc_bytes = (tot_num_hor_bytes +
				tot_num_eoc_symbols +
				(eoc_bytes == 0 ? 0 : tot_num_dummy_bytes));

	dwidth_dsc_fp = drm_fixp_from_fraction(dwidth_dsc_bytes, 3);

	temp2_fp = drm_fixp_mul(tu->pclk_fp, dwidth_dsc_fp);
	temp1_fp = drm_fixp_div(temp2_fp, tu->lwidth_fp);
	pclk_dsc_fp = temp1_fp;

	temp1_fp = drm_fixp_div(pclk_dsc_fp, tu->pclk_fp);
	temp2_fp = drm_fixp_mul(tu->hbp_relative_to_pclk_fp, temp1_fp);
	hbp_dsc_fp = temp2_fp;

	/* output */
	tu->pclk_fp = pclk_dsc_fp;
	tu->lwidth_fp = dwidth_dsc_fp;
	tu->hbp_relative_to_pclk_fp = hbp_dsc_fp;

fec_check:
	if (in->fec_en) {
		temp1_fp = drm_fixp_from_fraction(976, 1000); /* 0.976 */
		tu->lclk_fp = drm_fixp_mul(tu->lclk_fp, temp1_fp);
	}
}

static void _tu_valid_boundary_calc(struct tu_algo_data *tu)
{
	s64 temp1_fp, temp2_fp, temp, temp1, temp2;
	int compare_result_1, compare_result_2, compare_result_3;

	temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1);
	temp2_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp);

	tu->new_valid_boundary_link = drm_fixp2int_ceil(temp2_fp);

	temp = (tu->i_upper_boundary_count *
				tu->new_valid_boundary_link +
				tu->i_lower_boundary_count *
				(tu->new_valid_boundary_link-1));
	tu->average_valid2_fp = drm_fixp_from_fraction(temp,
					(tu->i_upper_boundary_count +
					tu->i_lower_boundary_count));

	temp1_fp = drm_fixp_from_fraction(tu->bpp, 8);
	temp2_fp = tu->lwidth_fp;
	temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp);
	temp2_fp = drm_fixp_div(temp1_fp, tu->average_valid2_fp);
	tu->n_tus = drm_fixp2int(temp2_fp);
	if ((temp2_fp & 0xFFFFFFFF) > 0xFFFFF000)
		tu->n_tus += 1;

	temp1_fp = drm_fixp_from_fraction(tu->n_tus, 1);
	temp2_fp = drm_fixp_mul(temp1_fp, tu->average_valid2_fp);
	temp1_fp = drm_fixp_from_fraction(tu->n_symbols, 1);
	temp2_fp = temp1_fp - temp2_fp;
	temp1_fp = drm_fixp_from_fraction(tu->nlanes, 1);
	temp2_fp = drm_fixp_div(temp2_fp, temp1_fp);
	tu->n_remainder_symbols_per_lane_fp = temp2_fp;

	temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1);
	tu->last_partial_tu_fp =
			drm_fixp_div(tu->n_remainder_symbols_per_lane_fp,
					temp1_fp);

	if (tu->n_remainder_symbols_per_lane_fp != 0)
		tu->remainder_symbols_exist = 1;
	else
		tu->remainder_symbols_exist = 0;

	temp1_fp = drm_fixp_from_fraction(tu->n_tus, tu->nlanes);
	tu->n_tus_per_lane = drm_fixp2int(temp1_fp);

	tu->paired_tus = (int)((tu->n_tus_per_lane) /
					(tu->i_upper_boundary_count +
					 tu->i_lower_boundary_count));

	tu->remainder_tus = tu->n_tus_per_lane - tu->paired_tus *
						(tu->i_upper_boundary_count +
						tu->i_lower_boundary_count);

	if ((tu->remainder_tus - tu->i_upper_boundary_count) > 0) {
		tu->remainder_tus_upper = tu->i_upper_boundary_count;
		tu->remainder_tus_lower = tu->remainder_tus -
						tu->i_upper_boundary_count;
	} else {
		tu->remainder_tus_upper = tu->remainder_tus;
		tu->remainder_tus_lower = 0;
	}

	temp = tu->paired_tus * (tu->i_upper_boundary_count *
				tu->new_valid_boundary_link +
				tu->i_lower_boundary_count *
				(tu->new_valid_boundary_link - 1)) +
				(tu->remainder_tus_upper *
				 tu->new_valid_boundary_link) +
				(tu->remainder_tus_lower *
				(tu->new_valid_boundary_link - 1));
	tu->total_valid_fp = drm_fixp_from_fraction(temp, 1);

	if (tu->remainder_symbols_exist) {
		temp1_fp = tu->total_valid_fp +
				tu->n_remainder_symbols_per_lane_fp;
		temp2_fp = drm_fixp_from_fraction(tu->n_tus_per_lane, 1);
		temp2_fp = temp2_fp + tu->last_partial_tu_fp;
		temp1_fp = drm_fixp_div(temp1_fp, temp2_fp);
	} else {
		temp2_fp = drm_fixp_from_fraction(tu->n_tus_per_lane, 1);
		temp1_fp = drm_fixp_div(tu->total_valid_fp, temp2_fp);
	}
	tu->effective_valid_fp = temp1_fp;

	temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1);
	temp2_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp);
	tu->n_n_err_fp = tu->effective_valid_fp - temp2_fp;

	temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1);
	temp2_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp);
	tu->n_err_fp = tu->average_valid2_fp - temp2_fp;

	tu->even_distribution = tu->n_tus % tu->nlanes == 0 ? 1 : 0;

	temp1_fp = drm_fixp_from_fraction(tu->bpp, 8);
	temp2_fp = tu->lwidth_fp;
	temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp);
	temp2_fp = drm_fixp_div(temp1_fp, tu->average_valid2_fp);

	if (temp2_fp)
		tu->n_tus_incl_last_incomplete_tu = drm_fixp2int_ceil(temp2_fp);
	else
		tu->n_tus_incl_last_incomplete_tu = 0;

	temp1 = 0;
	temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1);
	temp2_fp = drm_fixp_mul(tu->original_ratio_fp, temp1_fp);
	temp1_fp = tu->average_valid2_fp - temp2_fp;
	temp2_fp = drm_fixp_from_fraction(tu->n_tus_incl_last_incomplete_tu, 1);
	temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp);

	if (temp1_fp)
		temp1 = drm_fixp2int_ceil(temp1_fp);

	temp = tu->i_upper_boundary_count * tu->nlanes;
	temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1);
	temp2_fp = drm_fixp_mul(tu->original_ratio_fp, temp1_fp);
	temp1_fp = drm_fixp_from_fraction(tu->new_valid_boundary_link, 1);
	temp2_fp = temp1_fp - temp2_fp;
	temp1_fp = drm_fixp_from_fraction(temp, 1);
	temp2_fp = drm_fixp_mul(temp1_fp, temp2_fp);

	if (temp2_fp)
		temp2 = drm_fixp2int_ceil(temp2_fp);
	else
		temp2 = 0;
	tu->extra_required_bytes_new_tmp = (int)(temp1 + temp2);

	temp1_fp = drm_fixp_from_fraction(8, tu->bpp);
	temp2_fp = drm_fixp_from_fraction(
	tu->extra_required_bytes_new_tmp, 1);
	temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp);

	if (temp1_fp)
		tu->extra_pclk_cycles_tmp = drm_fixp2int_ceil(temp1_fp);
	else
		tu->extra_pclk_cycles_tmp = 0;

	temp1_fp = drm_fixp_from_fraction(tu->extra_pclk_cycles_tmp, 1);
	temp2_fp = drm_fixp_div(tu->lclk_fp, tu->pclk_fp);
	temp1_fp = drm_fixp_mul(temp1_fp, temp2_fp);

	if (temp1_fp)
		tu->extra_pclk_cycles_in_link_clk_tmp =
						drm_fixp2int_ceil(temp1_fp);
	else
		tu->extra_pclk_cycles_in_link_clk_tmp = 0;

	tu->filler_size_tmp = tu->tu_size - tu->new_valid_boundary_link;

	tu->lower_filler_size_tmp = tu->filler_size_tmp + 1;

	tu->delay_start_link_tmp = tu->extra_pclk_cycles_in_link_clk_tmp +
					tu->lower_filler_size_tmp +
					tu->extra_buffer_margin;

	temp1_fp = drm_fixp_from_fraction(tu->delay_start_link_tmp, 1);
	tu->delay_start_time_fp = drm_fixp_div(temp1_fp, tu->lclk_fp);

	compare_result_1 = _tu_param_compare(tu->n_n_err_fp, tu->diff_abs_fp);
	if (compare_result_1 == 2)
		compare_result_1 = 1;
	else
		compare_result_1 = 0;

	compare_result_2 = _tu_param_compare(tu->n_n_err_fp, tu->err_fp);
	if (compare_result_2 == 2)
		compare_result_2 = 1;
	else
		compare_result_2 = 0;

	compare_result_3 = _tu_param_compare(tu->hbp_time_fp,
					tu->delay_start_time_fp);
	if (compare_result_3 == 2)
		compare_result_3 = 0;
	else
		compare_result_3 = 1;

	if (((tu->even_distribution == 1) ||
			((tu->even_distribution_BF == 0) &&
			(tu->even_distribution_legacy == 0))) &&
			tu->n_err_fp >= 0 && tu->n_n_err_fp >= 0 &&
			compare_result_2 &&
			(compare_result_1 || (tu->min_hblank_violated == 1)) &&
			(tu->new_valid_boundary_link - 1) > 0 &&
			compare_result_3 &&
			(tu->delay_start_link_tmp <= 1023)) {
		tu->upper_boundary_count = tu->i_upper_boundary_count;
		tu->lower_boundary_count = tu->i_lower_boundary_count;
		tu->err_fp = tu->n_n_err_fp;
		tu->boundary_moderation_en = true;
		tu->tu_size_desired = tu->tu_size;
		tu->valid_boundary_link = tu->new_valid_boundary_link;
		tu->effective_valid_recorded_fp = tu->effective_valid_fp;
		tu->even_distribution_BF = 1;
		tu->delay_start_link = tu->delay_start_link_tmp;
	} else if (tu->boundary_mod_lower_err == 0) {
		compare_result_1 = _tu_param_compare(tu->n_n_err_fp,
							tu->diff_abs_fp);
		if (compare_result_1 == 2)
			tu->boundary_mod_lower_err = 1;
	}
}

static void _dp_ctrl_calc_tu(struct dp_tu_calc_input *in,
				   struct dp_vc_tu_mapping_table *tu_table)
{
	struct tu_algo_data *tu;
	int compare_result_1, compare_result_2;
	u64 temp = 0;
	s64 temp_fp = 0, temp1_fp = 0, temp2_fp = 0;

	s64 LCLK_FAST_SKEW_fp = drm_fixp_from_fraction(6, 10000); /* 0.0006 */
	s64 const_p49_fp = drm_fixp_from_fraction(49, 100); /* 0.49 */
	s64 const_p56_fp = drm_fixp_from_fraction(56, 100); /* 0.56 */
	s64 RATIO_SCALE_fp = drm_fixp_from_fraction(1001, 1000);

	u8 DP_BRUTE_FORCE = 1;
	s64 BRUTE_FORCE_THRESHOLD_fp = drm_fixp_from_fraction(1, 10); /* 0.1 */
	uint EXTRA_PIXCLK_CYCLE_DELAY = 4;
	uint HBLANK_MARGIN = 4;

	tu = kzalloc(sizeof(*tu), GFP_KERNEL);
	if (!tu)
		return;

	dp_panel_update_tu_timings(in, tu);

	tu->err_fp = drm_fixp_from_fraction(1000, 1); /* 1000 */

	temp1_fp = drm_fixp_from_fraction(4, 1);
	temp2_fp = drm_fixp_mul(temp1_fp, tu->lclk_fp);
	temp_fp = drm_fixp_div(temp2_fp, tu->pclk_fp);
	tu->extra_buffer_margin = drm_fixp2int_ceil(temp_fp);

	temp1_fp = drm_fixp_from_fraction(tu->bpp, 8);
	temp2_fp = drm_fixp_mul(tu->pclk_fp, temp1_fp);
	temp1_fp = drm_fixp_from_fraction(tu->nlanes, 1);
	temp2_fp = drm_fixp_div(temp2_fp, temp1_fp);
	tu->ratio_fp = drm_fixp_div(temp2_fp, tu->lclk_fp);

	tu->original_ratio_fp = tu->ratio_fp;
	tu->boundary_moderation_en = false;
	tu->upper_boundary_count = 0;
	tu->lower_boundary_count = 0;
	tu->i_upper_boundary_count = 0;
	tu->i_lower_boundary_count = 0;
	tu->valid_lower_boundary_link = 0;
	tu->even_distribution_BF = 0;
	tu->even_distribution_legacy = 0;
	tu->even_distribution = 0;
	tu->delay_start_time_fp = 0;

	tu->err_fp = drm_fixp_from_fraction(1000, 1);
	tu->n_err_fp = 0;
	tu->n_n_err_fp = 0;

	tu->ratio = drm_fixp2int(tu->ratio_fp);
	temp1_fp = drm_fixp_from_fraction(tu->nlanes, 1);
	div64_u64_rem(tu->lwidth_fp, temp1_fp, &temp2_fp);
	if (temp2_fp != 0 &&
			!tu->ratio && tu->dsc_en == 0) {
		tu->ratio_fp = drm_fixp_mul(tu->ratio_fp, RATIO_SCALE_fp);
		tu->ratio = drm_fixp2int(tu->ratio_fp);
		if (tu->ratio)
			tu->ratio_fp = drm_fixp_from_fraction(1, 1);
	}

	if (tu->ratio > 1)
		tu->ratio = 1;

	if (tu->ratio == 1)
		goto tu_size_calc;

	compare_result_1 = _tu_param_compare(tu->ratio_fp, const_p49_fp);
	if (!compare_result_1 || compare_result_1 == 1)
		compare_result_1 = 1;
	else
		compare_result_1 = 0;

	compare_result_2 = _tu_param_compare(tu->ratio_fp, const_p56_fp);
	if (!compare_result_2 || compare_result_2 == 2)
		compare_result_2 = 1;
	else
		compare_result_2 = 0;

	if (tu->dsc_en && compare_result_1 && compare_result_2) {
		HBLANK_MARGIN += 4;
		DRM_DEBUG_DP("Info: increase HBLANK_MARGIN to %d\n",
				HBLANK_MARGIN);
	}

tu_size_calc:
	for (tu->tu_size = 32; tu->tu_size <= 64; tu->tu_size++) {
		temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1);
		temp2_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp);
		temp = drm_fixp2int_ceil(temp2_fp);
		temp1_fp = drm_fixp_from_fraction(temp, 1);
		tu->n_err_fp = temp1_fp - temp2_fp;

		if (tu->n_err_fp < tu->err_fp) {
			tu->err_fp = tu->n_err_fp;
			tu->tu_size_desired = tu->tu_size;
		}
	}

	tu->tu_size_minus1 = tu->tu_size_desired - 1;

	temp1_fp = drm_fixp_from_fraction(tu->tu_size_desired, 1);
	temp2_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp);
	tu->valid_boundary_link = drm_fixp2int_ceil(temp2_fp);

	temp1_fp = drm_fixp_from_fraction(tu->bpp, 8);
	temp2_fp = tu->lwidth_fp;
	temp2_fp = drm_fixp_mul(temp2_fp, temp1_fp);

	temp1_fp = drm_fixp_from_fraction(tu->valid_boundary_link, 1);
	temp2_fp = drm_fixp_div(temp2_fp, temp1_fp);
	tu->n_tus = drm_fixp2int(temp2_fp);
	if ((temp2_fp & 0xFFFFFFFF) > 0xFFFFF000)
		tu->n_tus += 1;

	tu->even_distribution_legacy = tu->n_tus % tu->nlanes == 0 ? 1 : 0;
	DRM_DEBUG_DP("Info: n_sym = %d, num_of_tus = %d\n",
		tu->valid_boundary_link, tu->n_tus);

	temp1_fp = drm_fixp_from_fraction(tu->tu_size_desired, 1);
	temp2_fp = drm_fixp_mul(tu->original_ratio_fp, temp1_fp);
	temp1_fp = drm_fixp_from_fraction(tu->valid_boundary_link, 1);
	temp2_fp = temp1_fp - temp2_fp;
	temp1_fp = drm_fixp_from_fraction(tu->n_tus + 1, 1);
	temp2_fp = drm_fixp_mul(temp1_fp, temp2_fp);

	temp = drm_fixp2int(temp2_fp);
	if (temp && temp2_fp)
		tu->extra_bytes = drm_fixp2int_ceil(temp2_fp);
	else
		tu->extra_bytes = 0;

	temp1_fp = drm_fixp_from_fraction(tu->extra_bytes, 1);
	temp2_fp = drm_fixp_from_fraction(8, tu->bpp);
	temp1_fp = drm_fixp_mul(temp1_fp, temp2_fp);

	if (temp && temp1_fp)
		tu->extra_pclk_cycles = drm_fixp2int_ceil(temp1_fp);
	else
		tu->extra_pclk_cycles = drm_fixp2int(temp1_fp);

	temp1_fp = drm_fixp_div(tu->lclk_fp, tu->pclk_fp);
	temp2_fp = drm_fixp_from_fraction(tu->extra_pclk_cycles, 1);
	temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp);

	if (temp1_fp)
		tu->extra_pclk_cycles_in_link_clk = drm_fixp2int_ceil(temp1_fp);
	else
		tu->extra_pclk_cycles_in_link_clk = drm_fixp2int(temp1_fp);

	tu->filler_size = tu->tu_size_desired - tu->valid_boundary_link;

	temp1_fp = drm_fixp_from_fraction(tu->tu_size_desired, 1);
	tu->ratio_by_tu_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp);

	tu->delay_start_link = tu->extra_pclk_cycles_in_link_clk +
				tu->filler_size + tu->extra_buffer_margin;

	tu->resulting_valid_fp =
			drm_fixp_from_fraction(tu->valid_boundary_link, 1);

	temp1_fp = drm_fixp_from_fraction(tu->tu_size_desired, 1);
	temp2_fp = drm_fixp_div(tu->resulting_valid_fp, temp1_fp);
	tu->TU_ratio_err_fp = temp2_fp - tu->original_ratio_fp;

	temp1_fp = drm_fixp_from_fraction(HBLANK_MARGIN, 1);
	temp1_fp = tu->hbp_relative_to_pclk_fp - temp1_fp;
	tu->hbp_time_fp = drm_fixp_div(temp1_fp, tu->pclk_fp);

	temp1_fp = drm_fixp_from_fraction(tu->delay_start_link, 1);
	tu->delay_start_time_fp = drm_fixp_div(temp1_fp, tu->lclk_fp);

	compare_result_1 = _tu_param_compare(tu->hbp_time_fp,
					tu->delay_start_time_fp);
	if (compare_result_1 == 2) /* if (hbp_time_fp < delay_start_time_fp) */
		tu->min_hblank_violated = 1;

	tu->hactive_time_fp = drm_fixp_div(tu->lwidth_fp, tu->pclk_fp);

	compare_result_2 = _tu_param_compare(tu->hactive_time_fp,
						tu->delay_start_time_fp);
	if (compare_result_2 == 2)
		tu->min_hblank_violated = 1;

	tu->delay_start_time_fp = 0;

	/* brute force */

	tu->delay_start_link_extra_pixclk = EXTRA_PIXCLK_CYCLE_DELAY;
	tu->diff_abs_fp = tu->resulting_valid_fp - tu->ratio_by_tu_fp;

	temp = drm_fixp2int(tu->diff_abs_fp);
	if (!temp && tu->diff_abs_fp <= 0xffff)
		tu->diff_abs_fp = 0;

	/* if(diff_abs < 0) diff_abs *= -1 */
	if (tu->diff_abs_fp < 0)
		tu->diff_abs_fp = drm_fixp_mul(tu->diff_abs_fp, -1);

	tu->boundary_mod_lower_err = 0;
	if ((tu->diff_abs_fp != 0 &&
			((tu->diff_abs_fp > BRUTE_FORCE_THRESHOLD_fp) ||
			 (tu->even_distribution_legacy == 0) ||
			 (DP_BRUTE_FORCE == 1))) ||
			(tu->min_hblank_violated == 1)) {
		do {
			tu->err_fp = drm_fixp_from_fraction(1000, 1);

			temp1_fp = drm_fixp_div(tu->lclk_fp, tu->pclk_fp);
			temp2_fp = drm_fixp_from_fraction(
					tu->delay_start_link_extra_pixclk, 1);
			temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp);

			if (temp1_fp)
				tu->extra_buffer_margin =
					drm_fixp2int_ceil(temp1_fp);
			else
				tu->extra_buffer_margin = 0;

			temp1_fp = drm_fixp_from_fraction(tu->bpp, 8);
			temp1_fp = drm_fixp_mul(tu->lwidth_fp, temp1_fp);

			if (temp1_fp)
				tu->n_symbols = drm_fixp2int_ceil(temp1_fp);
			else
				tu->n_symbols = 0;

			for (tu->tu_size = 32; tu->tu_size <= 64; tu->tu_size++) {
				for (tu->i_upper_boundary_count = 1;
					tu->i_upper_boundary_count <= 15;
					tu->i_upper_boundary_count++) {
					for (tu->i_lower_boundary_count = 1;
						tu->i_lower_boundary_count <= 15;
						tu->i_lower_boundary_count++) {
						_tu_valid_boundary_calc(tu);
					}
				}
			}
			tu->delay_start_link_extra_pixclk--;
		} while (tu->boundary_moderation_en != true &&
			tu->boundary_mod_lower_err == 1 &&
			tu->delay_start_link_extra_pixclk != 0);

		if (tu->boundary_moderation_en == true) {
			temp1_fp = drm_fixp_from_fraction(
					(tu->upper_boundary_count *
					tu->valid_boundary_link +
					tu->lower_boundary_count *
					(tu->valid_boundary_link - 1)), 1);
			temp2_fp = drm_fixp_from_fraction(
					(tu->upper_boundary_count +
					tu->lower_boundary_count), 1);
			tu->resulting_valid_fp =
					drm_fixp_div(temp1_fp, temp2_fp);

			temp1_fp = drm_fixp_from_fraction(
					tu->tu_size_desired, 1);
			tu->ratio_by_tu_fp =
				drm_fixp_mul(tu->original_ratio_fp, temp1_fp);

			tu->valid_lower_boundary_link =
				tu->valid_boundary_link - 1;

			temp1_fp = drm_fixp_from_fraction(tu->bpp, 8);
			temp1_fp = drm_fixp_mul(tu->lwidth_fp, temp1_fp);
			temp2_fp = drm_fixp_div(temp1_fp,
						tu->resulting_valid_fp);
			tu->n_tus = drm_fixp2int(temp2_fp);

			tu->tu_size_minus1 = tu->tu_size_desired - 1;
			tu->even_distribution_BF = 1;

			temp1_fp =
				drm_fixp_from_fraction(tu->tu_size_desired, 1);
			temp2_fp =
				drm_fixp_div(tu->resulting_valid_fp, temp1_fp);
			tu->TU_ratio_err_fp = temp2_fp - tu->original_ratio_fp;
		}
	}

	temp2_fp = drm_fixp_mul(LCLK_FAST_SKEW_fp, tu->lwidth_fp);

	if (temp2_fp)
		temp = drm_fixp2int_ceil(temp2_fp);
	else
		temp = 0;

	temp1_fp = drm_fixp_from_fraction(tu->nlanes, 1);
	temp2_fp = drm_fixp_mul(tu->original_ratio_fp, temp1_fp);
	temp1_fp = drm_fixp_from_fraction(tu->bpp, 8);
	temp2_fp = drm_fixp_div(temp1_fp, temp2_fp);
	temp1_fp = drm_fixp_from_fraction(temp, 1);
	temp2_fp = drm_fixp_mul(temp1_fp, temp2_fp);
	temp = drm_fixp2int(temp2_fp);

	if (tu->async_en)
		tu->delay_start_link += (int)temp;

	temp1_fp = drm_fixp_from_fraction(tu->delay_start_link, 1);
	tu->delay_start_time_fp = drm_fixp_div(temp1_fp, tu->lclk_fp);

	/* OUTPUTS */
	tu_table->valid_boundary_link       = tu->valid_boundary_link;
	tu_table->delay_start_link          = tu->delay_start_link;
	tu_table->boundary_moderation_en    = tu->boundary_moderation_en;
	tu_table->valid_lower_boundary_link = tu->valid_lower_boundary_link;
	tu_table->upper_boundary_count      = tu->upper_boundary_count;
	tu_table->lower_boundary_count      = tu->lower_boundary_count;
	tu_table->tu_size_minus1            = tu->tu_size_minus1;

	DRM_DEBUG_DP("TU: valid_boundary_link: %d\n",
				tu_table->valid_boundary_link);
	DRM_DEBUG_DP("TU: delay_start_link: %d\n",
				tu_table->delay_start_link);
	DRM_DEBUG_DP("TU: boundary_moderation_en: %d\n",
			tu_table->boundary_moderation_en);
	DRM_DEBUG_DP("TU: valid_lower_boundary_link: %d\n",
			tu_table->valid_lower_boundary_link);
	DRM_DEBUG_DP("TU: upper_boundary_count: %d\n",
			tu_table->upper_boundary_count);
	DRM_DEBUG_DP("TU: lower_boundary_count: %d\n",
			tu_table->lower_boundary_count);
	DRM_DEBUG_DP("TU: tu_size_minus1: %d\n", tu_table->tu_size_minus1);

	kfree(tu);
}

static void dp_ctrl_calc_tu_parameters(struct dp_ctrl_private *ctrl,
		struct dp_vc_tu_mapping_table *tu_table)
{
	struct dp_tu_calc_input in;
	struct drm_display_mode *drm_mode;

	drm_mode = &ctrl->panel->dp_mode.drm_mode;

	in.lclk = ctrl->link->link_params.rate / 1000;
	in.pclk_khz = drm_mode->clock;
	in.hactive = drm_mode->hdisplay;
	in.hporch = drm_mode->htotal - drm_mode->hdisplay;
	in.nlanes = ctrl->link->link_params.num_lanes;
	in.bpp = ctrl->panel->dp_mode.bpp;
	in.pixel_enc = 444;
	in.dsc_en = 0;
	in.async_en = 0;
	in.fec_en = 0;
	in.num_of_dsc_slices = 0;
	in.compress_ratio = 100;

	_dp_ctrl_calc_tu(&in, tu_table);
}

static void dp_ctrl_setup_tr_unit(struct dp_ctrl_private *ctrl)
{
	u32 dp_tu = 0x0;
	u32 valid_boundary = 0x0;
	u32 valid_boundary2 = 0x0;
	struct dp_vc_tu_mapping_table tu_calc_table;

	dp_ctrl_calc_tu_parameters(ctrl, &tu_calc_table);

	dp_tu |= tu_calc_table.tu_size_minus1;
	valid_boundary |= tu_calc_table.valid_boundary_link;
	valid_boundary |= (tu_calc_table.delay_start_link << 16);

	valid_boundary2 |= (tu_calc_table.valid_lower_boundary_link << 1);
	valid_boundary2 |= (tu_calc_table.upper_boundary_count << 16);
	valid_boundary2 |= (tu_calc_table.lower_boundary_count << 20);

	if (tu_calc_table.boundary_moderation_en)
		valid_boundary2 |= BIT(0);

	pr_debug("dp_tu=0x%x, valid_boundary=0x%x, valid_boundary2=0x%x\n",
			dp_tu, valid_boundary, valid_boundary2);

	dp_catalog_ctrl_update_transfer_unit(ctrl->catalog,
				dp_tu, valid_boundary, valid_boundary2);
}

static int dp_ctrl_wait4video_ready(struct dp_ctrl_private *ctrl)
{
	int ret = 0;

	if (!wait_for_completion_timeout(&ctrl->video_comp,
				WAIT_FOR_VIDEO_READY_TIMEOUT_JIFFIES)) {
		DRM_ERROR("wait4video timedout\n");
		ret = -ETIMEDOUT;
	}
	return ret;
}

static int dp_ctrl_update_vx_px(struct dp_ctrl_private *ctrl)
{
	struct dp_link *link = ctrl->link;
	int ret = 0, lane, lane_cnt;
	u8 buf[4];
	u32 max_level_reached = 0;
	u32 voltage_swing_level = link->phy_params.v_level;
	u32 pre_emphasis_level = link->phy_params.p_level;

	ret = dp_catalog_ctrl_update_vx_px(ctrl->catalog,
		voltage_swing_level, pre_emphasis_level);

	if (ret)
		return ret;

	if (voltage_swing_level >= DP_TRAIN_VOLTAGE_SWING_MAX) {
		DRM_DEBUG_DP("max. voltage swing level reached %d\n",
				voltage_swing_level);
		max_level_reached |= DP_TRAIN_MAX_SWING_REACHED;
	}

	if (pre_emphasis_level >= DP_TRAIN_PRE_EMPHASIS_MAX) {
		DRM_DEBUG_DP("max. pre-emphasis level reached %d\n",
				pre_emphasis_level);
		max_level_reached  |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
	}

	pre_emphasis_level <<= DP_TRAIN_PRE_EMPHASIS_SHIFT;

	lane_cnt = ctrl->link->link_params.num_lanes;
	for (lane = 0; lane < lane_cnt; lane++)
		buf[lane] = voltage_swing_level | pre_emphasis_level
				| max_level_reached;

	DRM_DEBUG_DP("sink: p|v=0x%x\n", voltage_swing_level
					| pre_emphasis_level);
	ret = drm_dp_dpcd_write(ctrl->aux, DP_TRAINING_LANE0_SET,
					buf, lane_cnt);
	if (ret == lane_cnt)
		ret = 0;

	return ret;
}

static bool dp_ctrl_train_pattern_set(struct dp_ctrl_private *ctrl,
		u8 pattern)
{
	u8 buf;
	int ret = 0;

	DRM_DEBUG_DP("sink: pattern=%x\n", pattern);

	buf = pattern;

	if (pattern && pattern != DP_TRAINING_PATTERN_4)
		buf |= DP_LINK_SCRAMBLING_DISABLE;

	ret = drm_dp_dpcd_writeb(ctrl->aux, DP_TRAINING_PATTERN_SET, buf);
	return ret == 1;
}

static int dp_ctrl_read_link_status(struct dp_ctrl_private *ctrl,
				    u8 *link_status)
{
	int ret = 0, len;

	len = drm_dp_dpcd_read_link_status(ctrl->aux, link_status);
	if (len != DP_LINK_STATUS_SIZE) {
		DRM_ERROR("DP link status read failed, err: %d\n", len);
		ret = -EINVAL;
	}

	return ret;
}

static int dp_ctrl_link_train_1(struct dp_ctrl_private *ctrl,
		struct dp_cr_status *cr, int *training_step)
{
	int tries, old_v_level, ret = 0;
	u8 link_status[DP_LINK_STATUS_SIZE];
	int const maximum_retries = 4;

	dp_catalog_ctrl_state_ctrl(ctrl->catalog, 0);

	*training_step = DP_TRAINING_1;

	ret = dp_catalog_ctrl_set_pattern(ctrl->catalog, DP_TRAINING_PATTERN_1);
	if (ret)
		return ret;
	dp_ctrl_train_pattern_set(ctrl, DP_TRAINING_PATTERN_1 |
		DP_LINK_SCRAMBLING_DISABLE);

	ret = dp_ctrl_update_vx_px(ctrl);
	if (ret)
		return ret;

	tries = 0;
	old_v_level = ctrl->link->phy_params.v_level;
	for (tries = 0; tries < maximum_retries; tries++) {
		drm_dp_link_train_clock_recovery_delay(ctrl->aux, ctrl->panel->dpcd);

		ret = dp_ctrl_read_link_status(ctrl, link_status);
		if (ret)
			return ret;

		cr->lane_0_1 = link_status[0];
		cr->lane_2_3 = link_status[1];

		if (drm_dp_clock_recovery_ok(link_status,
			ctrl->link->link_params.num_lanes)) {
			return 0;
		}

		if (ctrl->link->phy_params.v_level >=
			DP_TRAIN_VOLTAGE_SWING_MAX) {
			DRM_ERROR_RATELIMITED("max v_level reached\n");
			return -EAGAIN;
		}

		if (old_v_level != ctrl->link->phy_params.v_level) {
			tries = 0;
			old_v_level = ctrl->link->phy_params.v_level;
		}

		DRM_DEBUG_DP("clock recovery not done, adjusting vx px\n");

		dp_link_adjust_levels(ctrl->link, link_status);
		ret = dp_ctrl_update_vx_px(ctrl);
		if (ret)
			return ret;
	}

	DRM_ERROR("max tries reached\n");
	return -ETIMEDOUT;
}

static int dp_ctrl_link_rate_down_shift(struct dp_ctrl_private *ctrl)
{
	int ret = 0;

	switch (ctrl->link->link_params.rate) {
	case 810000:
		ctrl->link->link_params.rate = 540000;
		break;
	case 540000:
		ctrl->link->link_params.rate = 270000;
		break;
	case 270000:
		ctrl->link->link_params.rate = 162000;
		break;
	case 162000:
	default:
		ret = -EINVAL;
		break;
	}

	if (!ret)
		DRM_DEBUG_DP("new rate=0x%x\n", ctrl->link->link_params.rate);

	return ret;
}

static int dp_ctrl_link_lane_down_shift(struct dp_ctrl_private *ctrl)
{

	if (ctrl->link->link_params.num_lanes == 1)
		return -1;

	ctrl->link->link_params.num_lanes /= 2;
	ctrl->link->link_params.rate = ctrl->panel->link_info.rate;

	ctrl->link->phy_params.p_level = 0;
	ctrl->link->phy_params.v_level = 0;

	return 0;
}

static void dp_ctrl_clear_training_pattern(struct dp_ctrl_private *ctrl)
{
	dp_ctrl_train_pattern_set(ctrl, DP_TRAINING_PATTERN_DISABLE);
	drm_dp_link_train_channel_eq_delay(ctrl->aux, ctrl->panel->dpcd);
}

static int dp_ctrl_link_train_2(struct dp_ctrl_private *ctrl,
		struct dp_cr_status *cr, int *training_step)
{
	int tries = 0, ret = 0;
	char pattern;
	int const maximum_retries = 5;
	u8 link_status[DP_LINK_STATUS_SIZE];

	dp_catalog_ctrl_state_ctrl(ctrl->catalog, 0);

	*training_step = DP_TRAINING_2;

	if (drm_dp_tps3_supported(ctrl->panel->dpcd))
		pattern = DP_TRAINING_PATTERN_3;
	else
		pattern = DP_TRAINING_PATTERN_2;

	ret = dp_ctrl_update_vx_px(ctrl);
	if (ret)
		return ret;

	ret = dp_catalog_ctrl_set_pattern(ctrl->catalog, pattern);
	if (ret)
		return ret;

	dp_ctrl_train_pattern_set(ctrl, pattern | DP_RECOVERED_CLOCK_OUT_EN);

	for (tries = 0; tries <= maximum_retries; tries++) {
		drm_dp_link_train_channel_eq_delay(ctrl->aux, ctrl->panel->dpcd);

		ret = dp_ctrl_read_link_status(ctrl, link_status);
		if (ret)
			return ret;
		cr->lane_0_1 = link_status[0];
		cr->lane_2_3 = link_status[1];

		if (drm_dp_channel_eq_ok(link_status,
			ctrl->link->link_params.num_lanes)) {
			return 0;
		}

		dp_link_adjust_levels(ctrl->link, link_status);
		ret = dp_ctrl_update_vx_px(ctrl);
		if (ret)
			return ret;

	}

	return -ETIMEDOUT;
}

static int dp_ctrl_reinitialize_mainlink(struct dp_ctrl_private *ctrl);

static int dp_ctrl_link_train(struct dp_ctrl_private *ctrl,
		struct dp_cr_status *cr, int *training_step)
{
	int ret = 0;
	u8 encoding = DP_SET_ANSI_8B10B;
	struct dp_link_info link_info = {0};

	dp_ctrl_config_ctrl(ctrl);

	link_info.num_lanes = ctrl->link->link_params.num_lanes;
	link_info.rate = ctrl->link->link_params.rate;
	link_info.capabilities = DP_LINK_CAP_ENHANCED_FRAMING;

	dp_aux_link_configure(ctrl->aux, &link_info);
	drm_dp_dpcd_write(ctrl->aux, DP_MAIN_LINK_CHANNEL_CODING_SET,
				&encoding, 1);

	ret = dp_ctrl_link_train_1(ctrl, cr, training_step);
	if (ret) {
		DRM_ERROR("link training #1 failed. ret=%d\n", ret);
		goto end;
	}

	/* print success info as this is a result of user initiated action */
	DRM_DEBUG_DP("link training #1 successful\n");

	ret = dp_ctrl_link_train_2(ctrl, cr, training_step);
	if (ret) {
		DRM_ERROR("link training #2 failed. ret=%d\n", ret);
		goto end;
	}

	/* print success info as this is a result of user initiated action */
	DRM_DEBUG_DP("link training #2 successful\n");

end:
	dp_catalog_ctrl_state_ctrl(ctrl->catalog, 0);

	return ret;
}

static int dp_ctrl_setup_main_link(struct dp_ctrl_private *ctrl,
		struct dp_cr_status *cr, int *training_step)
{
	int ret = 0;

	dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, true);

	if (ctrl->link->sink_request & DP_TEST_LINK_PHY_TEST_PATTERN)
		return ret;

	/*
	 * As part of previous calls, DP controller state might have
	 * transitioned to PUSH_IDLE. In order to start transmitting
	 * a link training pattern, we have to first do soft reset.
	 */

	ret = dp_ctrl_link_train(ctrl, cr, training_step);

	return ret;
}

static void dp_ctrl_set_clock_rate(struct dp_ctrl_private *ctrl,
			enum dp_pm_type module, char *name, unsigned long rate)
{
	u32 num = ctrl->parser->mp[module].num_clk;
	struct dss_clk *cfg = ctrl->parser->mp[module].clk_config;

	while (num && strcmp(cfg->clk_name, name)) {
		num--;
		cfg++;
	}

	DRM_DEBUG_DP("setting rate=%lu on clk=%s\n", rate, name);

	if (num)
		cfg->rate = rate;
	else
		DRM_ERROR("%s clock doesn't exit to set rate %lu\n",
				name, rate);
}

static int dp_ctrl_enable_mainlink_clocks(struct dp_ctrl_private *ctrl)
{
	int ret = 0;
	struct dp_io *dp_io = &ctrl->parser->io;
	struct phy *phy = dp_io->phy;
	struct phy_configure_opts_dp *opts_dp = &dp_io->phy_opts.dp;

	opts_dp->lanes = ctrl->link->link_params.num_lanes;
	opts_dp->link_rate = ctrl->link->link_params.rate / 100;
	dp_ctrl_set_clock_rate(ctrl, DP_CTRL_PM, "ctrl_link",
					ctrl->link->link_params.rate * 1000);

	phy_configure(phy, &dp_io->phy_opts);
	phy_power_on(phy);

	ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, true);
	if (ret)
		DRM_ERROR("Unable to start link clocks. ret=%d\n", ret);

	DRM_DEBUG_DP("link rate=%d pixel_clk=%d\n",
		ctrl->link->link_params.rate, ctrl->dp_ctrl.pixel_rate);

	return ret;
}

static int dp_ctrl_enable_stream_clocks(struct dp_ctrl_private *ctrl)
{
	int ret = 0;

	dp_ctrl_set_clock_rate(ctrl, DP_STREAM_PM, "stream_pixel",
					ctrl->dp_ctrl.pixel_rate * 1000);

	ret = dp_power_clk_enable(ctrl->power, DP_STREAM_PM, true);
	if (ret)
		DRM_ERROR("Unabled to start pixel clocks. ret=%d\n", ret);

	DRM_DEBUG_DP("link rate=%d pixel_clk=%d\n",
			ctrl->link->link_params.rate, ctrl->dp_ctrl.pixel_rate);

	return ret;
}

int dp_ctrl_host_init(struct dp_ctrl *dp_ctrl, bool flip, bool reset)
{
	struct dp_ctrl_private *ctrl;
	struct dp_io *dp_io;
	struct phy *phy;

	if (!dp_ctrl) {
		DRM_ERROR("Invalid input data\n");
		return -EINVAL;
	}

	ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
	dp_io = &ctrl->parser->io;
	phy = dp_io->phy;

	ctrl->dp_ctrl.orientation = flip;

	if (reset)
		dp_catalog_ctrl_reset(ctrl->catalog);

	dp_catalog_ctrl_phy_reset(ctrl->catalog);
	phy_init(phy);
	dp_catalog_ctrl_enable_irq(ctrl->catalog, true);

	return 0;
}

/**
 * dp_ctrl_host_deinit() - Uninitialize DP controller
 * @dp_ctrl: Display Port Driver data
 *
 * Perform required steps to uninitialize DP controller
 * and its resources.
 */
void dp_ctrl_host_deinit(struct dp_ctrl *dp_ctrl)
{
	struct dp_ctrl_private *ctrl;
	struct dp_io *dp_io;
	struct phy *phy;

	if (!dp_ctrl) {
		DRM_ERROR("Invalid input data\n");
		return;
	}

	ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
	dp_io = &ctrl->parser->io;
	phy = dp_io->phy;

	dp_catalog_ctrl_enable_irq(ctrl->catalog, false);
	phy_exit(phy);

	DRM_DEBUG_DP("Host deinitialized successfully\n");
}

static bool dp_ctrl_use_fixed_nvid(struct dp_ctrl_private *ctrl)
{
	u8 *dpcd = ctrl->panel->dpcd;

	/*
	 * For better interop experience, used a fixed NVID=0x8000
	 * whenever connected to a VGA dongle downstream.
	 */
	if (drm_dp_is_branch(dpcd))
		return (drm_dp_has_quirk(&ctrl->panel->desc,
					 DP_DPCD_QUIRK_CONSTANT_N));

	return false;
}

static int dp_ctrl_reinitialize_mainlink(struct dp_ctrl_private *ctrl)
{
	int ret = 0;
	struct dp_io *dp_io = &ctrl->parser->io;
	struct phy *phy = dp_io->phy;
	struct phy_configure_opts_dp *opts_dp = &dp_io->phy_opts.dp;

	dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false);
	opts_dp->lanes = ctrl->link->link_params.num_lanes;
	phy_configure(phy, &dp_io->phy_opts);
	/*
	 * Disable and re-enable the mainlink clock since the
	 * link clock might have been adjusted as part of the
	 * link maintenance.
	 */
	ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false);
	if (ret) {
		DRM_ERROR("Failed to disable clocks. ret=%d\n", ret);
		return ret;
	}
	phy_power_off(phy);
	/* hw recommended delay before re-enabling clocks */
	msleep(20);

	ret = dp_ctrl_enable_mainlink_clocks(ctrl);
	if (ret) {
		DRM_ERROR("Failed to enable mainlink clks. ret=%d\n", ret);
		return ret;
	}

	return ret;
}

static int dp_ctrl_deinitialize_mainlink(struct dp_ctrl_private *ctrl)
{
	struct dp_io *dp_io;
	struct phy *phy;
	int ret;

	dp_io = &ctrl->parser->io;
	phy = dp_io->phy;

	dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false);

	dp_catalog_ctrl_reset(ctrl->catalog);

	ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false);
	if (ret) {
		DRM_ERROR("Failed to disable link clocks. ret=%d\n", ret);
	}

	phy_power_off(phy);
	phy_exit(phy);

	return 0;
}

static int dp_ctrl_link_maintenance(struct dp_ctrl_private *ctrl)
{
	int ret = 0;
	struct dp_cr_status cr;
	int training_step = DP_TRAINING_NONE;

	dp_ctrl_push_idle(&ctrl->dp_ctrl);

	ctrl->dp_ctrl.pixel_rate = ctrl->panel->dp_mode.drm_mode.clock;

	ret = dp_ctrl_setup_main_link(ctrl, &cr, &training_step);
	if (ret)
		goto end;

	dp_ctrl_clear_training_pattern(ctrl);

	dp_catalog_ctrl_state_ctrl(ctrl->catalog, DP_STATE_CTRL_SEND_VIDEO);

	ret = dp_ctrl_wait4video_ready(ctrl);
end:
	return ret;
}

static int dp_ctrl_process_phy_test_request(struct dp_ctrl_private *ctrl)
{
	int ret = 0;

	if (!ctrl->link->phy_params.phy_test_pattern_sel) {
		DRM_DEBUG_DP("no test pattern selected by sink\n");
		return ret;
	}

	/*
	 * The global reset will need DP link related clocks to be
	 * running. Add the global reset just before disabling the
	 * link clocks and core clocks.
	 */
	ret = dp_ctrl_off(&ctrl->dp_ctrl);
	if (ret) {
		DRM_ERROR("failed to disable DP controller\n");
		return ret;
	}

	ret = dp_ctrl_on_link(&ctrl->dp_ctrl);
	if (!ret)
		ret = dp_ctrl_on_stream(&ctrl->dp_ctrl);
	else
		DRM_ERROR("failed to enable DP link controller\n");

	return ret;
}

static bool dp_ctrl_send_phy_test_pattern(struct dp_ctrl_private *ctrl)
{
	bool success = false;
	u32 pattern_sent = 0x0;
	u32 pattern_requested = ctrl->link->phy_params.phy_test_pattern_sel;

	DRM_DEBUG_DP("request: 0x%x\n", pattern_requested);

	if (dp_catalog_ctrl_update_vx_px(ctrl->catalog,
			ctrl->link->phy_params.v_level,
			ctrl->link->phy_params.p_level)) {
		DRM_ERROR("Failed to set v/p levels\n");
		return false;
	}
	dp_catalog_ctrl_send_phy_pattern(ctrl->catalog, pattern_requested);
	dp_ctrl_update_vx_px(ctrl);
	dp_link_send_test_response(ctrl->link);

	pattern_sent = dp_catalog_ctrl_read_phy_pattern(ctrl->catalog);

	switch (pattern_sent) {
	case MR_LINK_TRAINING1:
		success = (pattern_requested ==
				DP_PHY_TEST_PATTERN_D10_2);
		break;
	case MR_LINK_SYMBOL_ERM:
		success = ((pattern_requested ==
			DP_PHY_TEST_PATTERN_ERROR_COUNT) ||
				(pattern_requested ==
				DP_PHY_TEST_PATTERN_CP2520));
		break;
	case MR_LINK_PRBS7:
		success = (pattern_requested ==
				DP_PHY_TEST_PATTERN_PRBS7);
		break;
	case MR_LINK_CUSTOM80:
		success = (pattern_requested ==
				DP_PHY_TEST_PATTERN_80BIT_CUSTOM);
		break;
	case MR_LINK_TRAINING4:
		success = (pattern_requested ==
				DP_PHY_TEST_PATTERN_SEL_MASK);
		break;
	default:
		success = false;
	}

	DRM_DEBUG_DP("%s: test->0x%x\n", success ? "success" : "failed",
						pattern_requested);
	return success;
}

void dp_ctrl_handle_sink_request(struct dp_ctrl *dp_ctrl)
{
	struct dp_ctrl_private *ctrl;
	u32 sink_request = 0x0;

	if (!dp_ctrl) {
		DRM_ERROR("invalid input\n");
		return;
	}

	ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
	sink_request = ctrl->link->sink_request;

	if (sink_request & DP_TEST_LINK_PHY_TEST_PATTERN) {
		DRM_DEBUG_DP("PHY_TEST_PATTERN request\n");
		if (dp_ctrl_process_phy_test_request(ctrl)) {
			DRM_ERROR("process phy_test_req failed\n");
			return;
		}
	}

	if (sink_request & DP_LINK_STATUS_UPDATED) {
		if (dp_ctrl_link_maintenance(ctrl)) {
			DRM_ERROR("LM failed: TEST_LINK_TRAINING\n");
			return;
		}
	}

	if (sink_request & DP_TEST_LINK_TRAINING) {
		dp_link_send_test_response(ctrl->link);
		if (dp_ctrl_link_maintenance(ctrl)) {
			DRM_ERROR("LM failed: TEST_LINK_TRAINING\n");
			return;
		}
	}
}

int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl)
{
	int rc = 0;
	struct dp_ctrl_private *ctrl;
	u32 rate = 0;
	int link_train_max_retries = 5;
	u32 const phy_cts_pixel_clk_khz = 148500;
	struct dp_cr_status cr;
	unsigned int training_step;

	if (!dp_ctrl)
		return -EINVAL;

	ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);

	rate = ctrl->panel->link_info.rate;

	dp_power_clk_enable(ctrl->power, DP_CORE_PM, true);

	if (ctrl->link->sink_request & DP_TEST_LINK_PHY_TEST_PATTERN) {
		DRM_DEBUG_DP("using phy test link parameters\n");
		if (!ctrl->panel->dp_mode.drm_mode.clock)
			ctrl->dp_ctrl.pixel_rate = phy_cts_pixel_clk_khz;
	} else {
		ctrl->link->link_params.rate = rate;
		ctrl->link->link_params.num_lanes =
			ctrl->panel->link_info.num_lanes;
		ctrl->dp_ctrl.pixel_rate = ctrl->panel->dp_mode.drm_mode.clock;
	}

	DRM_DEBUG_DP("rate=%d, num_lanes=%d, pixel_rate=%d\n",
		ctrl->link->link_params.rate,
		ctrl->link->link_params.num_lanes, ctrl->dp_ctrl.pixel_rate);

	rc = dp_ctrl_enable_mainlink_clocks(ctrl);
	if (rc)
		return rc;

	while (--link_train_max_retries) {
		rc = dp_ctrl_reinitialize_mainlink(ctrl);
		if (rc) {
			DRM_ERROR("Failed to reinitialize mainlink. rc=%d\n",
					rc);
			break;
		}

		training_step = DP_TRAINING_NONE;
		rc = dp_ctrl_setup_main_link(ctrl, &cr, &training_step);
		if (rc == 0) {
			/* training completed successfully */
			break;
		} else if (training_step == DP_TRAINING_1) {
			/* link train_1 failed */
			if (!dp_catalog_link_is_connected(ctrl->catalog)) {
				break;
			}

			rc = dp_ctrl_link_rate_down_shift(ctrl);
			if (rc < 0) { /* already in RBR = 1.6G */
				if (cr.lane_0_1 & DP_LANE0_1_CR_DONE) {
					/*
					 * some lanes are ready,
					 * reduce lane number
					 */
					rc = dp_ctrl_link_lane_down_shift(ctrl);
					if (rc < 0) { /* lane == 1 already */
						/* end with failure */
						break;
					}
				} else {
					/* end with failure */
					break; /* lane == 1 already */
				}
			}
		} else if (training_step == DP_TRAINING_2) {
			/* link train_2 failed, lower lane rate */
			if (!dp_catalog_link_is_connected(ctrl->catalog)) {
				break;
			}

			rc = dp_ctrl_link_lane_down_shift(ctrl);
			if (rc < 0) {
				/* end with failure */
				break; /* lane == 1 already */
			}
		}
	}

	if (ctrl->link->sink_request & DP_TEST_LINK_PHY_TEST_PATTERN)
		return rc;

	/* stop txing train pattern */
	dp_ctrl_clear_training_pattern(ctrl);

	/*
	 * keep transmitting idle pattern until video ready
	 * to avoid main link from loss of sync
	 */
	if (rc == 0)  /* link train successfully */
		dp_ctrl_push_idle(dp_ctrl);
	else  {
		/* link training failed */
		dp_ctrl_deinitialize_mainlink(ctrl);
		rc = -ECONNRESET;
	}

	return rc;
}

int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl)
{
	u32 rate = 0;
	int ret = 0;
	bool mainlink_ready = false;
	struct dp_ctrl_private *ctrl;

	if (!dp_ctrl)
		return -EINVAL;

	ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);

	rate = ctrl->panel->link_info.rate;

	ctrl->link->link_params.rate = rate;
	ctrl->link->link_params.num_lanes = ctrl->panel->link_info.num_lanes;
	ctrl->dp_ctrl.pixel_rate = ctrl->panel->dp_mode.drm_mode.clock;

	DRM_DEBUG_DP("rate=%d, num_lanes=%d, pixel_rate=%d\n",
		ctrl->link->link_params.rate,
		ctrl->link->link_params.num_lanes, ctrl->dp_ctrl.pixel_rate);

	if (!dp_power_clk_status(ctrl->power, DP_CTRL_PM)) { /* link clk is off */
		ret = dp_ctrl_enable_mainlink_clocks(ctrl);
		if (ret) {
			DRM_ERROR("Failed to start link clocks. ret=%d\n", ret);
			goto end;
		}
	}

	ret = dp_ctrl_enable_stream_clocks(ctrl);
	if (ret) {
		DRM_ERROR("Failed to start pixel clocks. ret=%d\n", ret);
		goto end;
	}

	if (ctrl->link->sink_request & DP_TEST_LINK_PHY_TEST_PATTERN) {
		dp_ctrl_send_phy_test_pattern(ctrl);
		return 0;
	}

	/*
	 * Set up transfer unit values and set controller state to send
	 * video.
	 */
	reinit_completion(&ctrl->video_comp);

	dp_ctrl_configure_source_params(ctrl);

	dp_catalog_ctrl_config_msa(ctrl->catalog,
		ctrl->link->link_params.rate,
		ctrl->dp_ctrl.pixel_rate, dp_ctrl_use_fixed_nvid(ctrl));

	dp_ctrl_setup_tr_unit(ctrl);

	dp_catalog_ctrl_state_ctrl(ctrl->catalog, DP_STATE_CTRL_SEND_VIDEO);

	ret = dp_ctrl_wait4video_ready(ctrl);
	if (ret)
		return ret;

	mainlink_ready = dp_catalog_ctrl_mainlink_ready(ctrl->catalog);
	DRM_DEBUG_DP("mainlink %s\n", mainlink_ready ? "READY" : "NOT READY");

end:
	return ret;
}

int dp_ctrl_off_link_stream(struct dp_ctrl *dp_ctrl)
{
	struct dp_ctrl_private *ctrl;
	struct dp_io *dp_io;
	struct phy *phy;
	int ret;

	ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
	dp_io = &ctrl->parser->io;
	phy = dp_io->phy;

	/* set dongle to D3 (power off) mode */
	dp_link_psm_config(ctrl->link, &ctrl->panel->link_info, true);

	dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false);

	if (dp_power_clk_status(ctrl->power, DP_STREAM_PM)) {
		ret = dp_power_clk_enable(ctrl->power, DP_STREAM_PM, false);
		if (ret) {
			DRM_ERROR("Failed to disable pclk. ret=%d\n", ret);
			return ret;
		}
	}

	ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false);
	if (ret) {
		DRM_ERROR("Failed to disable link clocks. ret=%d\n", ret);
		return ret;
	}

	phy_power_off(phy);

	/* aux channel down, reinit phy */
	phy_exit(phy);
	phy_init(phy);

	DRM_DEBUG_DP("DP off link/stream done\n");
	return ret;
}

void dp_ctrl_off_phy(struct dp_ctrl *dp_ctrl)
{
	struct dp_ctrl_private *ctrl;
	struct dp_io *dp_io;
	struct phy *phy;

	ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
	dp_io = &ctrl->parser->io;
	phy = dp_io->phy;

	dp_catalog_ctrl_reset(ctrl->catalog);

	phy_exit(phy);

	DRM_DEBUG_DP("DP off phy done\n");
}

int dp_ctrl_off(struct dp_ctrl *dp_ctrl)
{
	struct dp_ctrl_private *ctrl;
	struct dp_io *dp_io;
	struct phy *phy;
	int ret = 0;

	if (!dp_ctrl)
		return -EINVAL;

	ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
	dp_io = &ctrl->parser->io;
	phy = dp_io->phy;

	dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false);

	dp_catalog_ctrl_reset(ctrl->catalog);

	ret = dp_power_clk_enable(ctrl->power, DP_STREAM_PM, false);
	if (ret)
		DRM_ERROR("Failed to disable pixel clocks. ret=%d\n", ret);

	ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false);
	if (ret) {
		DRM_ERROR("Failed to disable link clocks. ret=%d\n", ret);
	}

	phy_power_off(phy);
	phy_exit(phy);

	DRM_DEBUG_DP("DP off done\n");
	return ret;
}

void dp_ctrl_isr(struct dp_ctrl *dp_ctrl)
{
	struct dp_ctrl_private *ctrl;
	u32 isr;

	if (!dp_ctrl)
		return;

	ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);

	isr = dp_catalog_ctrl_get_interrupt(ctrl->catalog);

	if (isr & DP_CTRL_INTR_READY_FOR_VIDEO) {
		DRM_DEBUG_DP("dp_video_ready\n");
		complete(&ctrl->video_comp);
	}

	if (isr & DP_CTRL_INTR_IDLE_PATTERN_SENT) {
		DRM_DEBUG_DP("idle_patterns_sent\n");
		complete(&ctrl->idle_comp);
	}
}

struct dp_ctrl *dp_ctrl_get(struct device *dev, struct dp_link *link,
			struct dp_panel *panel,	struct drm_dp_aux *aux,
			struct dp_power *power, struct dp_catalog *catalog,
			struct dp_parser *parser)
{
	struct dp_ctrl_private *ctrl;
	int ret;

	if (!dev || !panel || !aux ||
	    !link || !catalog) {
		DRM_ERROR("invalid input\n");
		return ERR_PTR(-EINVAL);
	}

	ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
	if (!ctrl) {
		DRM_ERROR("Mem allocation failure\n");
		return ERR_PTR(-ENOMEM);
	}

	ret = devm_pm_opp_set_clkname(dev, "ctrl_link");
	if (ret) {
		dev_err(dev, "invalid DP OPP table in device tree\n");
		/* caller do PTR_ERR(opp_table) */
		return (struct dp_ctrl *)ERR_PTR(ret);
	}

	/* OPP table is optional */
	ret = devm_pm_opp_of_add_table(dev);
	if (ret)
		dev_err(dev, "failed to add DP OPP table\n");

	init_completion(&ctrl->idle_comp);
	init_completion(&ctrl->video_comp);

	/* in parameters */
	ctrl->parser   = parser;
	ctrl->panel    = panel;
	ctrl->power    = power;
	ctrl->aux      = aux;
	ctrl->link     = link;
	ctrl->catalog  = catalog;
	ctrl->dev      = dev;

	return &ctrl->dp_ctrl;
}