-
Notifications
You must be signed in to change notification settings - Fork 102
/
intel_backlight.c
1776 lines (1422 loc) · 54.9 KB
/
intel_backlight.c
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
// SPDX-License-Identifier: MIT
/*
* Copyright © 2021 Intel Corporation
*/
#include <linux/kernel.h>
#include <linux/pwm.h>
#include "intel_backlight.h"
#include "intel_connector.h"
#include "intel_de.h"
#include "intel_display_types.h"
#include "intel_dp_aux_backlight.h"
#include "intel_dsi_dcs_backlight.h"
#include "intel_panel.h"
/**
* scale - scale values from one range to another
* @source_val: value in range [@source_min..@source_max]
* @source_min: minimum legal value for @source_val
* @source_max: maximum legal value for @source_val
* @target_min: corresponding target value for @source_min
* @target_max: corresponding target value for @source_max
*
* Return @source_val in range [@source_min..@source_max] scaled to range
* [@target_min..@target_max].
*/
static u32 scale(u32 source_val,
u32 source_min, u32 source_max,
u32 target_min, u32 target_max)
{
u64 target_val;
WARN_ON(source_min > source_max);
WARN_ON(target_min > target_max);
/* defensive */
source_val = clamp(source_val, source_min, source_max);
/* avoid overflows */
target_val = mul_u32_u32(source_val - source_min,
target_max - target_min);
target_val = DIV_ROUND_CLOSEST_ULL(target_val, source_max - source_min);
target_val += target_min;
return target_val;
}
/*
* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
* to [hw_min..hw_max].
*/
static u32 clamp_user_to_hw(struct intel_connector *connector,
u32 user_level, u32 user_max)
{
struct intel_panel *panel = &connector->panel;
u32 hw_level;
hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
return hw_level;
}
/* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
static u32 scale_hw_to_user(struct intel_connector *connector,
u32 hw_level, u32 user_max)
{
struct intel_panel *panel = &connector->panel;
return scale(hw_level, panel->backlight.min, panel->backlight.max,
0, user_max);
}
u32 intel_panel_invert_pwm_level(struct intel_connector *connector, u32 val)
{
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_level_max == 0);
if (dev_priv->params.invert_brightness < 0)
return val;
if (dev_priv->params.invert_brightness > 0 ||
dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
return panel->backlight.pwm_level_max - val + panel->backlight.pwm_level_min;
}
return val;
}
void intel_panel_set_pwm_level(const struct drm_connector_state *conn_state, u32 val)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
drm_dbg_kms(&i915->drm, "set backlight PWM = %d\n", val);
panel->backlight.pwm_funcs->set(conn_state, val);
}
u32 intel_panel_backlight_level_to_pwm(struct intel_connector *connector, u32 val)
{
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
drm_WARN_ON_ONCE(&dev_priv->drm,
panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0);
val = scale(val, panel->backlight.min, panel->backlight.max,
panel->backlight.pwm_level_min, panel->backlight.pwm_level_max);
return intel_panel_invert_pwm_level(connector, val);
}
u32 intel_panel_backlight_level_from_pwm(struct intel_connector *connector, u32 val)
{
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
drm_WARN_ON_ONCE(&dev_priv->drm,
panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0);
if (dev_priv->params.invert_brightness > 0 ||
(dev_priv->params.invert_brightness == 0 && dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS))
val = panel->backlight.pwm_level_max - (val - panel->backlight.pwm_level_min);
return scale(val, panel->backlight.pwm_level_min, panel->backlight.pwm_level_max,
panel->backlight.min, panel->backlight.max);
}
static u32 lpt_get_backlight(struct intel_connector *connector, enum pipe unused)
{
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
return intel_de_read(dev_priv, BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
}
static u32 pch_get_backlight(struct intel_connector *connector, enum pipe unused)
{
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
return intel_de_read(dev_priv, BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
}
static u32 i9xx_get_backlight(struct intel_connector *connector, enum pipe unused)
{
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 val;
val = intel_de_read(dev_priv, BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
if (DISPLAY_VER(dev_priv) < 4)
val >>= 1;
if (panel->backlight.combination_mode) {
u8 lbpc;
pci_read_config_byte(to_pci_dev(dev_priv->drm.dev), LBPC, &lbpc);
val *= lbpc;
}
return val;
}
static u32 vlv_get_backlight(struct intel_connector *connector, enum pipe pipe)
{
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
if (drm_WARN_ON(&dev_priv->drm, pipe != PIPE_A && pipe != PIPE_B))
return 0;
return intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
}
static u32 bxt_get_backlight(struct intel_connector *connector, enum pipe unused)
{
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
return intel_de_read(dev_priv,
BXT_BLC_PWM_DUTY(panel->backlight.controller));
}
static u32 ext_pwm_get_backlight(struct intel_connector *connector, enum pipe unused)
{
struct intel_panel *panel = &connector->panel;
struct pwm_state state;
pwm_get_state(panel->backlight.pwm, &state);
return pwm_get_relative_duty_cycle(&state, 100);
}
static void lpt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
u32 val = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, val | level);
}
static void pch_set_backlight(const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
u32 tmp;
tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
intel_de_write(dev_priv, BLC_PWM_CPU_CTL, tmp | level);
}
static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 tmp, mask;
drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_level_max == 0);
if (panel->backlight.combination_mode) {
u8 lbpc;
lbpc = level * 0xfe / panel->backlight.pwm_level_max + 1;
level /= lbpc;
pci_write_config_byte(to_pci_dev(dev_priv->drm.dev), LBPC, lbpc);
}
if (DISPLAY_VER(dev_priv) == 4) {
mask = BACKLIGHT_DUTY_CYCLE_MASK;
} else {
level <<= 1;
mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
}
tmp = intel_de_read(dev_priv, BLC_PWM_CTL) & ~mask;
intel_de_write(dev_priv, BLC_PWM_CTL, tmp | level);
}
static void vlv_set_backlight(const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
u32 tmp;
tmp = intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
intel_de_write(dev_priv, VLV_BLC_PWM_CTL(pipe), tmp | level);
}
static void bxt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
intel_de_write(dev_priv,
BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
}
static void ext_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
{
struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
}
static void
intel_panel_actually_set_backlight(const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
drm_dbg_kms(&i915->drm, "set backlight level = %d\n", level);
panel->backlight.funcs->set(conn_state, level);
}
/* set backlight brightness to level in range [0..max], assuming hw min is
* respected.
*/
void intel_panel_set_backlight_acpi(const struct drm_connector_state *conn_state,
u32 user_level, u32 user_max)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 hw_level;
/*
* Lack of crtc may occur during driver init because
* connection_mutex isn't held across the entire backlight
* setup + modeset readout, and the BIOS can issue the
* requests at any time.
*/
if (!panel->backlight.present || !conn_state->crtc)
return;
mutex_lock(&dev_priv->backlight_lock);
drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
hw_level = clamp_user_to_hw(connector, user_level, user_max);
panel->backlight.level = hw_level;
if (panel->backlight.device)
panel->backlight.device->props.brightness =
scale_hw_to_user(connector,
panel->backlight.level,
panel->backlight.device->props.max_brightness);
if (panel->backlight.enabled)
intel_panel_actually_set_backlight(conn_state, hw_level);
mutex_unlock(&dev_priv->backlight_lock);
}
static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
u32 tmp;
intel_panel_set_pwm_level(old_conn_state, level);
/*
* Although we don't support or enable CPU PWM with LPT/SPT based
* systems, it may have been enabled prior to loading the
* driver. Disable to avoid warnings on LCPLL disable.
*
* This needs rework if we need to add support for CPU PWM on PCH split
* platforms.
*/
tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
if (tmp & BLM_PWM_ENABLE) {
drm_dbg_kms(&dev_priv->drm,
"cpu backlight was enabled, disabling\n");
intel_de_write(dev_priv, BLC_PWM_CPU_CTL2,
tmp & ~BLM_PWM_ENABLE);
}
tmp = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
}
static void pch_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
{
struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
u32 tmp;
intel_panel_set_pwm_level(old_conn_state, val);
tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
tmp = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
}
static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
{
intel_panel_set_pwm_level(old_conn_state, val);
}
static void i965_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
{
struct drm_i915_private *dev_priv = to_i915(old_conn_state->connector->dev);
u32 tmp;
intel_panel_set_pwm_level(old_conn_state, val);
tmp = intel_de_read(dev_priv, BLC_PWM_CTL2);
intel_de_write(dev_priv, BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
}
static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
{
struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
enum pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe;
u32 tmp;
intel_panel_set_pwm_level(old_conn_state, val);
tmp = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe),
tmp & ~BLM_PWM_ENABLE);
}
static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
{
struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 tmp;
intel_panel_set_pwm_level(old_conn_state, val);
tmp = intel_de_read(dev_priv,
BXT_BLC_PWM_CTL(panel->backlight.controller));
intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
tmp & ~BXT_BLC_PWM_ENABLE);
if (panel->backlight.controller == 1) {
val = intel_de_read(dev_priv, UTIL_PIN_CTL);
val &= ~UTIL_PIN_ENABLE;
intel_de_write(dev_priv, UTIL_PIN_CTL, val);
}
}
static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
{
struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 tmp;
intel_panel_set_pwm_level(old_conn_state, val);
tmp = intel_de_read(dev_priv,
BXT_BLC_PWM_CTL(panel->backlight.controller));
intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
tmp & ~BXT_BLC_PWM_ENABLE);
}
static void ext_pwm_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
struct intel_panel *panel = &connector->panel;
panel->backlight.pwm_state.enabled = false;
pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
}
void intel_panel_disable_backlight(const struct drm_connector_state *old_conn_state)
{
struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
if (!panel->backlight.present)
return;
/*
* Do not disable backlight on the vga_switcheroo path. When switching
* away from i915, the other client may depend on i915 to handle the
* backlight. This will leave the backlight on unnecessarily when
* another client is not activated.
*/
if (dev_priv->drm.switch_power_state == DRM_SWITCH_POWER_CHANGING) {
drm_dbg_kms(&dev_priv->drm,
"Skipping backlight disable on vga switch\n");
return;
}
mutex_lock(&dev_priv->backlight_lock);
if (panel->backlight.device)
panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
panel->backlight.enabled = false;
panel->backlight.funcs->disable(old_conn_state, 0);
mutex_unlock(&dev_priv->backlight_lock);
}
static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 pch_ctl1, pch_ctl2, schicken;
pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
drm_dbg_kms(&dev_priv->drm, "pch backlight already enabled\n");
pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
}
if (HAS_PCH_LPT(dev_priv)) {
schicken = intel_de_read(dev_priv, SOUTH_CHICKEN2);
if (panel->backlight.alternate_pwm_increment)
schicken |= LPT_PWM_GRANULARITY;
else
schicken &= ~LPT_PWM_GRANULARITY;
intel_de_write(dev_priv, SOUTH_CHICKEN2, schicken);
} else {
schicken = intel_de_read(dev_priv, SOUTH_CHICKEN1);
if (panel->backlight.alternate_pwm_increment)
schicken |= SPT_PWM_GRANULARITY;
else
schicken &= ~SPT_PWM_GRANULARITY;
intel_de_write(dev_priv, SOUTH_CHICKEN1, schicken);
}
pch_ctl2 = panel->backlight.pwm_level_max << 16;
intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, pch_ctl2);
pch_ctl1 = 0;
if (panel->backlight.active_low_pwm)
pch_ctl1 |= BLM_PCH_POLARITY;
/* After LPT, override is the default. */
if (HAS_PCH_LPT(dev_priv))
pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
intel_de_posting_read(dev_priv, BLC_PWM_PCH_CTL1);
intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
pch_ctl1 | BLM_PCH_PWM_ENABLE);
/* This won't stick until the above enable. */
intel_panel_set_pwm_level(conn_state, level);
}
static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
u32 cpu_ctl2, pch_ctl1, pch_ctl2;
cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
if (cpu_ctl2 & BLM_PWM_ENABLE) {
drm_dbg_kms(&dev_priv->drm, "cpu backlight already enabled\n");
cpu_ctl2 &= ~BLM_PWM_ENABLE;
intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2);
}
pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
drm_dbg_kms(&dev_priv->drm, "pch backlight already enabled\n");
pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
}
if (cpu_transcoder == TRANSCODER_EDP)
cpu_ctl2 = BLM_TRANSCODER_EDP;
else
cpu_ctl2 = BLM_PIPE(cpu_transcoder);
intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2);
intel_de_posting_read(dev_priv, BLC_PWM_CPU_CTL2);
intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
/* This won't stick until the above enable. */
intel_panel_set_pwm_level(conn_state, level);
pch_ctl2 = panel->backlight.pwm_level_max << 16;
intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, pch_ctl2);
pch_ctl1 = 0;
if (panel->backlight.active_low_pwm)
pch_ctl1 |= BLM_PCH_POLARITY;
intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
intel_de_posting_read(dev_priv, BLC_PWM_PCH_CTL1);
intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
pch_ctl1 | BLM_PCH_PWM_ENABLE);
}
static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 ctl, freq;
ctl = intel_de_read(dev_priv, BLC_PWM_CTL);
if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
intel_de_write(dev_priv, BLC_PWM_CTL, 0);
}
freq = panel->backlight.pwm_level_max;
if (panel->backlight.combination_mode)
freq /= 0xff;
ctl = freq << 17;
if (panel->backlight.combination_mode)
ctl |= BLM_LEGACY_MODE;
if (IS_PINEVIEW(dev_priv) && panel->backlight.active_low_pwm)
ctl |= BLM_POLARITY_PNV;
intel_de_write(dev_priv, BLC_PWM_CTL, ctl);
intel_de_posting_read(dev_priv, BLC_PWM_CTL);
/* XXX: combine this into above write? */
intel_panel_set_pwm_level(conn_state, level);
/*
* Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
* 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
* that has backlight.
*/
if (DISPLAY_VER(dev_priv) == 2)
intel_de_write(dev_priv, BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
}
static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
u32 ctl, ctl2, freq;
ctl2 = intel_de_read(dev_priv, BLC_PWM_CTL2);
if (ctl2 & BLM_PWM_ENABLE) {
drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
ctl2 &= ~BLM_PWM_ENABLE;
intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2);
}
freq = panel->backlight.pwm_level_max;
if (panel->backlight.combination_mode)
freq /= 0xff;
ctl = freq << 16;
intel_de_write(dev_priv, BLC_PWM_CTL, ctl);
ctl2 = BLM_PIPE(pipe);
if (panel->backlight.combination_mode)
ctl2 |= BLM_COMBINATION_MODE;
if (panel->backlight.active_low_pwm)
ctl2 |= BLM_POLARITY_I965;
intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2);
intel_de_posting_read(dev_priv, BLC_PWM_CTL2);
intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
intel_panel_set_pwm_level(conn_state, level);
}
static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
u32 ctl, ctl2;
ctl2 = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
if (ctl2 & BLM_PWM_ENABLE) {
drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
ctl2 &= ~BLM_PWM_ENABLE;
intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe), ctl2);
}
ctl = panel->backlight.pwm_level_max << 16;
intel_de_write(dev_priv, VLV_BLC_PWM_CTL(pipe), ctl);
/* XXX: combine this into above write? */
intel_panel_set_pwm_level(conn_state, level);
ctl2 = 0;
if (panel->backlight.active_low_pwm)
ctl2 |= BLM_POLARITY_I965;
intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe), ctl2);
intel_de_posting_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe),
ctl2 | BLM_PWM_ENABLE);
}
static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
u32 pwm_ctl, val;
/* Controller 1 uses the utility pin. */
if (panel->backlight.controller == 1) {
val = intel_de_read(dev_priv, UTIL_PIN_CTL);
if (val & UTIL_PIN_ENABLE) {
drm_dbg_kms(&dev_priv->drm,
"util pin already enabled\n");
val &= ~UTIL_PIN_ENABLE;
intel_de_write(dev_priv, UTIL_PIN_CTL, val);
}
val = 0;
if (panel->backlight.util_pin_active_low)
val |= UTIL_PIN_POLARITY;
intel_de_write(dev_priv, UTIL_PIN_CTL,
val | UTIL_PIN_PIPE(pipe) | UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
}
pwm_ctl = intel_de_read(dev_priv,
BXT_BLC_PWM_CTL(panel->backlight.controller));
if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
intel_de_write(dev_priv,
BXT_BLC_PWM_CTL(panel->backlight.controller),
pwm_ctl);
}
intel_de_write(dev_priv,
BXT_BLC_PWM_FREQ(panel->backlight.controller),
panel->backlight.pwm_level_max);
intel_panel_set_pwm_level(conn_state, level);
pwm_ctl = 0;
if (panel->backlight.active_low_pwm)
pwm_ctl |= BXT_BLC_PWM_POLARITY;
intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
pwm_ctl);
intel_de_posting_read(dev_priv,
BXT_BLC_PWM_CTL(panel->backlight.controller));
intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
pwm_ctl | BXT_BLC_PWM_ENABLE);
}
static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 pwm_ctl;
pwm_ctl = intel_de_read(dev_priv,
BXT_BLC_PWM_CTL(panel->backlight.controller));
if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
intel_de_write(dev_priv,
BXT_BLC_PWM_CTL(panel->backlight.controller),
pwm_ctl);
}
intel_de_write(dev_priv,
BXT_BLC_PWM_FREQ(panel->backlight.controller),
panel->backlight.pwm_level_max);
intel_panel_set_pwm_level(conn_state, level);
pwm_ctl = 0;
if (panel->backlight.active_low_pwm)
pwm_ctl |= BXT_BLC_PWM_POLARITY;
intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
pwm_ctl);
intel_de_posting_read(dev_priv,
BXT_BLC_PWM_CTL(panel->backlight.controller));
intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
pwm_ctl | BXT_BLC_PWM_ENABLE);
}
static void ext_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct intel_panel *panel = &connector->panel;
pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
panel->backlight.pwm_state.enabled = true;
pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
}
static void __intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct intel_panel *panel = &connector->panel;
WARN_ON(panel->backlight.max == 0);
if (panel->backlight.level <= panel->backlight.min) {
panel->backlight.level = panel->backlight.max;
if (panel->backlight.device)
panel->backlight.device->props.brightness =
scale_hw_to_user(connector,
panel->backlight.level,
panel->backlight.device->props.max_brightness);
}
panel->backlight.funcs->enable(crtc_state, conn_state, panel->backlight.level);
panel->backlight.enabled = true;
if (panel->backlight.device)
panel->backlight.device->props.power = FB_BLANK_UNBLANK;
}
void intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
if (!panel->backlight.present)
return;
drm_dbg_kms(&dev_priv->drm, "pipe %c\n", pipe_name(pipe));
mutex_lock(&dev_priv->backlight_lock);
__intel_panel_enable_backlight(crtc_state, conn_state);
mutex_unlock(&dev_priv->backlight_lock);
}
#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
static u32 intel_panel_get_backlight(struct intel_connector *connector)
{
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 val = 0;
mutex_lock(&dev_priv->backlight_lock);
if (panel->backlight.enabled)
val = panel->backlight.funcs->get(connector, intel_connector_get_pipe(connector));
mutex_unlock(&dev_priv->backlight_lock);
drm_dbg_kms(&dev_priv->drm, "get backlight PWM = %d\n", val);
return val;
}
/* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
static u32 scale_user_to_hw(struct intel_connector *connector,
u32 user_level, u32 user_max)
{
struct intel_panel *panel = &connector->panel;
return scale(user_level, 0, user_max,
panel->backlight.min, panel->backlight.max);
}
/* set backlight brightness to level in range [0..max], scaling wrt hw min */
static void intel_panel_set_backlight(const struct drm_connector_state *conn_state,
u32 user_level, u32 user_max)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 hw_level;
if (!panel->backlight.present)
return;
mutex_lock(&dev_priv->backlight_lock);
drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
hw_level = scale_user_to_hw(connector, user_level, user_max);
panel->backlight.level = hw_level;
if (panel->backlight.enabled)
intel_panel_actually_set_backlight(conn_state, hw_level);
mutex_unlock(&dev_priv->backlight_lock);
}
static int intel_backlight_device_update_status(struct backlight_device *bd)
{
struct intel_connector *connector = bl_get_data(bd);
struct intel_panel *panel = &connector->panel;
struct drm_device *dev = connector->base.dev;
drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
bd->props.brightness, bd->props.max_brightness);
intel_panel_set_backlight(connector->base.state, bd->props.brightness,
bd->props.max_brightness);
/*
* Allow flipping bl_power as a sub-state of enabled. Sadly the
* backlight class device does not make it easy to differentiate
* between callbacks for brightness and bl_power, so our backlight_power
* callback needs to take this into account.
*/
if (panel->backlight.enabled) {
if (panel->backlight.power) {
bool enable = bd->props.power == FB_BLANK_UNBLANK &&
bd->props.brightness != 0;
panel->backlight.power(connector, enable);
}
} else {
bd->props.power = FB_BLANK_POWERDOWN;
}
drm_modeset_unlock(&dev->mode_config.connection_mutex);
return 0;
}
static int intel_backlight_device_get_brightness(struct backlight_device *bd)
{
struct intel_connector *connector = bl_get_data(bd);
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = to_i915(dev);
intel_wakeref_t wakeref;
int ret = 0;
with_intel_runtime_pm(&dev_priv->runtime_pm, wakeref) {
u32 hw_level;
drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
hw_level = intel_panel_get_backlight(connector);
ret = scale_hw_to_user(connector,
hw_level, bd->props.max_brightness);
drm_modeset_unlock(&dev->mode_config.connection_mutex);
}
return ret;
}
static const struct backlight_ops intel_backlight_device_ops = {
.update_status = intel_backlight_device_update_status,
.get_brightness = intel_backlight_device_get_brightness,
};
int intel_backlight_device_register(struct intel_connector *connector)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
struct backlight_properties props;
struct backlight_device *bd;
const char *name;
int ret = 0;
if (WARN_ON(panel->backlight.device))
return -ENODEV;
if (!panel->backlight.present)
return 0;
WARN_ON(panel->backlight.max == 0);
memset(&props, 0, sizeof(props));
props.type = BACKLIGHT_RAW;
/*
* Note: Everything should work even if the backlight device max
* presented to the userspace is arbitrarily chosen.
*/
props.max_brightness = panel->backlight.max;
props.brightness = scale_hw_to_user(connector,
panel->backlight.level,
props.max_brightness);
if (panel->backlight.enabled)
props.power = FB_BLANK_UNBLANK;
else
props.power = FB_BLANK_POWERDOWN;
name = kstrdup("intel_backlight", GFP_KERNEL);
if (!name)
return -ENOMEM;
bd = backlight_device_get_by_name(name);
if (bd) {
put_device(&bd->dev);
/*
* Using the same name independent of the drm device or connector
* prevents registration of multiple backlight devices in the
* driver. However, we need to use the default name for backward
* compatibility. Use unique names for subsequent backlight devices as a
* fallback when the default name already exists.
*/
kfree(name);
name = kasprintf(GFP_KERNEL, "card%d-%s-backlight",
i915->drm.primary->index, connector->base.name);
if (!name)
return -ENOMEM;
}
bd = backlight_device_register(name, connector->base.kdev, connector,
&intel_backlight_device_ops, &props);
if (IS_ERR(bd)) {
drm_err(&i915->drm,
"[CONNECTOR:%d:%s] backlight device %s register failed: %ld\n",
connector->base.base.id, connector->base.name, name, PTR_ERR(bd));
ret = PTR_ERR(bd);
goto out;
}
panel->backlight.device = bd;
drm_dbg_kms(&i915->drm,
"[CONNECTOR:%d:%s] backlight device %s registered\n",
connector->base.base.id, connector->base.name, name);