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1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2021 Intel Corporation
4 */
5
6#include <linux/backlight.h>
7#include <linux/kernel.h>
8#include <linux/pwm.h>
9#include <linux/string_helpers.h>
10
11#include <acpi/video.h>
12
13#include "i915_reg.h"
14#include "intel_backlight.h"
15#include "intel_backlight_regs.h"
16#include "intel_connector.h"
17#include "intel_de.h"
18#include "intel_display_types.h"
19#include "intel_dp_aux_backlight.h"
20#include "intel_dsi_dcs_backlight.h"
21#include "intel_panel.h"
22#include "intel_pci_config.h"
23#include "intel_pps.h"
24#include "intel_quirks.h"
25
26/**
27 * scale - scale values from one range to another
28 * @source_val: value in range [@source_min..@source_max]
29 * @source_min: minimum legal value for @source_val
30 * @source_max: maximum legal value for @source_val
31 * @target_min: corresponding target value for @source_min
32 * @target_max: corresponding target value for @source_max
33 *
34 * Return @source_val in range [@source_min..@source_max] scaled to range
35 * [@target_min..@target_max].
36 */
37static u32 scale(u32 source_val,
38 u32 source_min, u32 source_max,
39 u32 target_min, u32 target_max)
40{
41 u64 target_val;
42
43 WARN_ON(source_min > source_max);
44 WARN_ON(target_min > target_max);
45
46 /* defensive */
47 source_val = clamp(source_val, source_min, source_max);
48
49 /* avoid overflows */
50 target_val = mul_u32_u32(source_val - source_min,
51 target_max - target_min);
52 target_val = DIV_ROUND_CLOSEST_ULL(target_val, source_max - source_min);
53 target_val += target_min;
54
55 return target_val;
56}
57
58/*
59 * Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
60 * to [hw_min..hw_max].
61 */
62static u32 clamp_user_to_hw(struct intel_connector *connector,
63 u32 user_level, u32 user_max)
64{
65 struct intel_panel *panel = &connector->panel;
66 u32 hw_level;
67
68 hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
69 hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
70
71 return hw_level;
72}
73
74/* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
75static u32 scale_hw_to_user(struct intel_connector *connector,
76 u32 hw_level, u32 user_max)
77{
78 struct intel_panel *panel = &connector->panel;
79
80 return scale(hw_level, panel->backlight.min, panel->backlight.max,
81 0, user_max);
82}
83
84u32 intel_backlight_invert_pwm_level(struct intel_connector *connector, u32 val)
85{
86 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
87 struct intel_panel *panel = &connector->panel;
88
89 drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_level_max == 0);
90
91 if (dev_priv->params.invert_brightness < 0)
92 return val;
93
94 if (dev_priv->params.invert_brightness > 0 ||
95 intel_has_quirk(dev_priv, QUIRK_INVERT_BRIGHTNESS)) {
96 return panel->backlight.pwm_level_max - val + panel->backlight.pwm_level_min;
97 }
98
99 return val;
100}
101
102void intel_backlight_set_pwm_level(const struct drm_connector_state *conn_state, u32 val)
103{
104 struct intel_connector *connector = to_intel_connector(conn_state->connector);
105 struct drm_i915_private *i915 = to_i915(connector->base.dev);
106 struct intel_panel *panel = &connector->panel;
107
108 drm_dbg_kms(&i915->drm, "set backlight PWM = %d\n", val);
109 panel->backlight.pwm_funcs->set(conn_state, val);
110}
111
112u32 intel_backlight_level_to_pwm(struct intel_connector *connector, u32 val)
113{
114 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
115 struct intel_panel *panel = &connector->panel;
116
117 drm_WARN_ON_ONCE(&dev_priv->drm,
118 panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0);
119
120 val = scale(val, panel->backlight.min, panel->backlight.max,
121 panel->backlight.pwm_level_min, panel->backlight.pwm_level_max);
122
123 return intel_backlight_invert_pwm_level(connector, val);
124}
125
126u32 intel_backlight_level_from_pwm(struct intel_connector *connector, u32 val)
127{
128 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
129 struct intel_panel *panel = &connector->panel;
130
131 drm_WARN_ON_ONCE(&dev_priv->drm,
132 panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0);
133
134 if (dev_priv->params.invert_brightness > 0 ||
135 (dev_priv->params.invert_brightness == 0 && intel_has_quirk(dev_priv, QUIRK_INVERT_BRIGHTNESS)))
136 val = panel->backlight.pwm_level_max - (val - panel->backlight.pwm_level_min);
137
138 return scale(val, panel->backlight.pwm_level_min, panel->backlight.pwm_level_max,
139 panel->backlight.min, panel->backlight.max);
140}
141
142static u32 lpt_get_backlight(struct intel_connector *connector, enum pipe unused)
143{
144 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
145
146 return intel_de_read(dev_priv, BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
147}
148
149static u32 pch_get_backlight(struct intel_connector *connector, enum pipe unused)
150{
151 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
152
153 return intel_de_read(dev_priv, BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
154}
155
156static u32 i9xx_get_backlight(struct intel_connector *connector, enum pipe unused)
157{
158 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
159 struct intel_panel *panel = &connector->panel;
160 u32 val;
161
162 val = intel_de_read(dev_priv, BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
163 if (DISPLAY_VER(dev_priv) < 4)
164 val >>= 1;
165
166 if (panel->backlight.combination_mode) {
167 u8 lbpc;
168
169 pci_read_config_byte(to_pci_dev(dev_priv->drm.dev), LBPC, &lbpc);
170 val *= lbpc;
171 }
172
173 return val;
174}
175
176static u32 vlv_get_backlight(struct intel_connector *connector, enum pipe pipe)
177{
178 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
179
180 if (drm_WARN_ON(&dev_priv->drm, pipe != PIPE_A && pipe != PIPE_B))
181 return 0;
182
183 return intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
184}
185
186static u32 bxt_get_backlight(struct intel_connector *connector, enum pipe unused)
187{
188 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
189 struct intel_panel *panel = &connector->panel;
190
191 return intel_de_read(dev_priv,
192 BXT_BLC_PWM_DUTY(panel->backlight.controller));
193}
194
195static u32 ext_pwm_get_backlight(struct intel_connector *connector, enum pipe unused)
196{
197 struct intel_panel *panel = &connector->panel;
198 struct pwm_state state;
199
200 pwm_get_state(panel->backlight.pwm, &state);
201 return pwm_get_relative_duty_cycle(&state, 100);
202}
203
204static void lpt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
205{
206 struct intel_connector *connector = to_intel_connector(conn_state->connector);
207 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
208
209 u32 val = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
210 intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, val | level);
211}
212
213static void pch_set_backlight(const struct drm_connector_state *conn_state, u32 level)
214{
215 struct intel_connector *connector = to_intel_connector(conn_state->connector);
216 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
217 u32 tmp;
218
219 tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
220 intel_de_write(dev_priv, BLC_PWM_CPU_CTL, tmp | level);
221}
222
223static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32 level)
224{
225 struct intel_connector *connector = to_intel_connector(conn_state->connector);
226 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
227 struct intel_panel *panel = &connector->panel;
228 u32 tmp, mask;
229
230 drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_level_max == 0);
231
232 if (panel->backlight.combination_mode) {
233 u8 lbpc;
234
235 lbpc = level * 0xfe / panel->backlight.pwm_level_max + 1;
236 level /= lbpc;
237 pci_write_config_byte(to_pci_dev(dev_priv->drm.dev), LBPC, lbpc);
238 }
239
240 if (DISPLAY_VER(dev_priv) == 4) {
241 mask = BACKLIGHT_DUTY_CYCLE_MASK;
242 } else {
243 level <<= 1;
244 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
245 }
246
247 tmp = intel_de_read(dev_priv, BLC_PWM_CTL) & ~mask;
248 intel_de_write(dev_priv, BLC_PWM_CTL, tmp | level);
249}
250
251static void vlv_set_backlight(const struct drm_connector_state *conn_state, u32 level)
252{
253 struct intel_connector *connector = to_intel_connector(conn_state->connector);
254 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
255 enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
256 u32 tmp;
257
258 tmp = intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
259 intel_de_write(dev_priv, VLV_BLC_PWM_CTL(pipe), tmp | level);
260}
261
262static void bxt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
263{
264 struct intel_connector *connector = to_intel_connector(conn_state->connector);
265 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
266 struct intel_panel *panel = &connector->panel;
267
268 intel_de_write(dev_priv,
269 BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
270}
271
272static void ext_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
273{
274 struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
275
276 pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
277 pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
278}
279
280static void
281intel_panel_actually_set_backlight(const struct drm_connector_state *conn_state, u32 level)
282{
283 struct intel_connector *connector = to_intel_connector(conn_state->connector);
284 struct drm_i915_private *i915 = to_i915(connector->base.dev);
285 struct intel_panel *panel = &connector->panel;
286
287 drm_dbg_kms(&i915->drm, "set backlight level = %d\n", level);
288
289 panel->backlight.funcs->set(conn_state, level);
290}
291
292/* set backlight brightness to level in range [0..max], assuming hw min is
293 * respected.
294 */
295void intel_backlight_set_acpi(const struct drm_connector_state *conn_state,
296 u32 user_level, u32 user_max)
297{
298 struct intel_connector *connector = to_intel_connector(conn_state->connector);
299 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
300 struct intel_panel *panel = &connector->panel;
301 u32 hw_level;
302
303 /*
304 * Lack of crtc may occur during driver init because
305 * connection_mutex isn't held across the entire backlight
306 * setup + modeset readout, and the BIOS can issue the
307 * requests at any time.
308 */
309 if (!panel->backlight.present || !conn_state->crtc)
310 return;
311
312 mutex_lock(&dev_priv->display.backlight.lock);
313
314 drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
315
316 hw_level = clamp_user_to_hw(connector, user_level, user_max);
317 panel->backlight.level = hw_level;
318
319 if (panel->backlight.device)
320 panel->backlight.device->props.brightness =
321 scale_hw_to_user(connector,
322 panel->backlight.level,
323 panel->backlight.device->props.max_brightness);
324
325 if (panel->backlight.enabled)
326 intel_panel_actually_set_backlight(conn_state, hw_level);
327
328 mutex_unlock(&dev_priv->display.backlight.lock);
329}
330
331static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
332{
333 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
334 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
335 u32 tmp;
336
337 intel_backlight_set_pwm_level(old_conn_state, level);
338
339 /*
340 * Although we don't support or enable CPU PWM with LPT/SPT based
341 * systems, it may have been enabled prior to loading the
342 * driver. Disable to avoid warnings on LCPLL disable.
343 *
344 * This needs rework if we need to add support for CPU PWM on PCH split
345 * platforms.
346 */
347 tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
348 if (tmp & BLM_PWM_ENABLE) {
349 drm_dbg_kms(&dev_priv->drm,
350 "cpu backlight was enabled, disabling\n");
351 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2,
352 tmp & ~BLM_PWM_ENABLE);
353 }
354
355 tmp = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
356 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
357}
358
359static void pch_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
360{
361 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
362 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
363 u32 tmp;
364
365 intel_backlight_set_pwm_level(old_conn_state, val);
366
367 tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
368 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
369
370 tmp = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
371 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
372}
373
374static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
375{
376 intel_backlight_set_pwm_level(old_conn_state, val);
377}
378
379static void i965_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
380{
381 struct drm_i915_private *dev_priv = to_i915(old_conn_state->connector->dev);
382 u32 tmp;
383
384 intel_backlight_set_pwm_level(old_conn_state, val);
385
386 tmp = intel_de_read(dev_priv, BLC_PWM_CTL2);
387 intel_de_write(dev_priv, BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
388}
389
390static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
391{
392 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
393 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
394 enum pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe;
395 u32 tmp;
396
397 intel_backlight_set_pwm_level(old_conn_state, val);
398
399 tmp = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
400 intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe),
401 tmp & ~BLM_PWM_ENABLE);
402}
403
404static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
405{
406 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
407 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
408 struct intel_panel *panel = &connector->panel;
409 u32 tmp;
410
411 intel_backlight_set_pwm_level(old_conn_state, val);
412
413 tmp = intel_de_read(dev_priv,
414 BXT_BLC_PWM_CTL(panel->backlight.controller));
415 intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
416 tmp & ~BXT_BLC_PWM_ENABLE);
417
418 if (panel->backlight.controller == 1) {
419 val = intel_de_read(dev_priv, UTIL_PIN_CTL);
420 val &= ~UTIL_PIN_ENABLE;
421 intel_de_write(dev_priv, UTIL_PIN_CTL, val);
422 }
423}
424
425static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
426{
427 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
428 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
429 struct intel_panel *panel = &connector->panel;
430 u32 tmp;
431
432 intel_backlight_set_pwm_level(old_conn_state, val);
433
434 tmp = intel_de_read(dev_priv,
435 BXT_BLC_PWM_CTL(panel->backlight.controller));
436 intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
437 tmp & ~BXT_BLC_PWM_ENABLE);
438}
439
440static void ext_pwm_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
441{
442 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
443 struct intel_panel *panel = &connector->panel;
444
445 intel_backlight_set_pwm_level(old_conn_state, level);
446
447 panel->backlight.pwm_state.enabled = false;
448 pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
449}
450
451void intel_backlight_disable(const struct drm_connector_state *old_conn_state)
452{
453 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
454 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
455 struct intel_panel *panel = &connector->panel;
456
457 if (!panel->backlight.present)
458 return;
459
460 /*
461 * Do not disable backlight on the vga_switcheroo path. When switching
462 * away from i915, the other client may depend on i915 to handle the
463 * backlight. This will leave the backlight on unnecessarily when
464 * another client is not activated.
465 */
466 if (dev_priv->drm.switch_power_state == DRM_SWITCH_POWER_CHANGING) {
467 drm_dbg_kms(&dev_priv->drm,
468 "Skipping backlight disable on vga switch\n");
469 return;
470 }
471
472 mutex_lock(&dev_priv->display.backlight.lock);
473
474 if (panel->backlight.device)
475 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
476 panel->backlight.enabled = false;
477 panel->backlight.funcs->disable(old_conn_state, 0);
478
479 mutex_unlock(&dev_priv->display.backlight.lock);
480}
481
482static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,
483 const struct drm_connector_state *conn_state, u32 level)
484{
485 struct intel_connector *connector = to_intel_connector(conn_state->connector);
486 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
487 struct intel_panel *panel = &connector->panel;
488 u32 pch_ctl1, pch_ctl2, schicken;
489
490 pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
491 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
492 drm_dbg_kms(&dev_priv->drm, "pch backlight already enabled\n");
493 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
494 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
495 }
496
497 if (HAS_PCH_LPT(dev_priv)) {
498 schicken = intel_de_read(dev_priv, SOUTH_CHICKEN2);
499 if (panel->backlight.alternate_pwm_increment)
500 schicken |= LPT_PWM_GRANULARITY;
501 else
502 schicken &= ~LPT_PWM_GRANULARITY;
503 intel_de_write(dev_priv, SOUTH_CHICKEN2, schicken);
504 } else {
505 schicken = intel_de_read(dev_priv, SOUTH_CHICKEN1);
506 if (panel->backlight.alternate_pwm_increment)
507 schicken |= SPT_PWM_GRANULARITY;
508 else
509 schicken &= ~SPT_PWM_GRANULARITY;
510 intel_de_write(dev_priv, SOUTH_CHICKEN1, schicken);
511 }
512
513 pch_ctl2 = panel->backlight.pwm_level_max << 16;
514 intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, pch_ctl2);
515
516 pch_ctl1 = 0;
517 if (panel->backlight.active_low_pwm)
518 pch_ctl1 |= BLM_PCH_POLARITY;
519
520 /* After LPT, override is the default. */
521 if (HAS_PCH_LPT(dev_priv))
522 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
523
524 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
525 intel_de_posting_read(dev_priv, BLC_PWM_PCH_CTL1);
526 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
527 pch_ctl1 | BLM_PCH_PWM_ENABLE);
528
529 /* This won't stick until the above enable. */
530 intel_backlight_set_pwm_level(conn_state, level);
531}
532
533static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
534 const struct drm_connector_state *conn_state, u32 level)
535{
536 struct intel_connector *connector = to_intel_connector(conn_state->connector);
537 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
538 struct intel_panel *panel = &connector->panel;
539 enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
540 u32 cpu_ctl2, pch_ctl1, pch_ctl2;
541
542 cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
543 if (cpu_ctl2 & BLM_PWM_ENABLE) {
544 drm_dbg_kms(&dev_priv->drm, "cpu backlight already enabled\n");
545 cpu_ctl2 &= ~BLM_PWM_ENABLE;
546 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2);
547 }
548
549 pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
550 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
551 drm_dbg_kms(&dev_priv->drm, "pch backlight already enabled\n");
552 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
553 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
554 }
555
556 if (cpu_transcoder == TRANSCODER_EDP)
557 cpu_ctl2 = BLM_TRANSCODER_EDP;
558 else
559 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
560 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2);
561 intel_de_posting_read(dev_priv, BLC_PWM_CPU_CTL2);
562 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
563
564 /* This won't stick until the above enable. */
565 intel_backlight_set_pwm_level(conn_state, level);
566
567 pch_ctl2 = panel->backlight.pwm_level_max << 16;
568 intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, pch_ctl2);
569
570 pch_ctl1 = 0;
571 if (panel->backlight.active_low_pwm)
572 pch_ctl1 |= BLM_PCH_POLARITY;
573
574 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
575 intel_de_posting_read(dev_priv, BLC_PWM_PCH_CTL1);
576 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
577 pch_ctl1 | BLM_PCH_PWM_ENABLE);
578}
579
580static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
581 const struct drm_connector_state *conn_state, u32 level)
582{
583 struct intel_connector *connector = to_intel_connector(conn_state->connector);
584 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
585 struct intel_panel *panel = &connector->panel;
586 u32 ctl, freq;
587
588 ctl = intel_de_read(dev_priv, BLC_PWM_CTL);
589 if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
590 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
591 intel_de_write(dev_priv, BLC_PWM_CTL, 0);
592 }
593
594 freq = panel->backlight.pwm_level_max;
595 if (panel->backlight.combination_mode)
596 freq /= 0xff;
597
598 ctl = freq << 17;
599 if (panel->backlight.combination_mode)
600 ctl |= BLM_LEGACY_MODE;
601 if (IS_PINEVIEW(dev_priv) && panel->backlight.active_low_pwm)
602 ctl |= BLM_POLARITY_PNV;
603
604 intel_de_write(dev_priv, BLC_PWM_CTL, ctl);
605 intel_de_posting_read(dev_priv, BLC_PWM_CTL);
606
607 /* XXX: combine this into above write? */
608 intel_backlight_set_pwm_level(conn_state, level);
609
610 /*
611 * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
612 * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
613 * that has backlight.
614 */
615 if (DISPLAY_VER(dev_priv) == 2)
616 intel_de_write(dev_priv, BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
617}
618
619static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,
620 const struct drm_connector_state *conn_state, u32 level)
621{
622 struct intel_connector *connector = to_intel_connector(conn_state->connector);
623 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
624 struct intel_panel *panel = &connector->panel;
625 enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
626 u32 ctl, ctl2, freq;
627
628 ctl2 = intel_de_read(dev_priv, BLC_PWM_CTL2);
629 if (ctl2 & BLM_PWM_ENABLE) {
630 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
631 ctl2 &= ~BLM_PWM_ENABLE;
632 intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2);
633 }
634
635 freq = panel->backlight.pwm_level_max;
636 if (panel->backlight.combination_mode)
637 freq /= 0xff;
638
639 ctl = freq << 16;
640 intel_de_write(dev_priv, BLC_PWM_CTL, ctl);
641
642 ctl2 = BLM_PIPE(pipe);
643 if (panel->backlight.combination_mode)
644 ctl2 |= BLM_COMBINATION_MODE;
645 if (panel->backlight.active_low_pwm)
646 ctl2 |= BLM_POLARITY_I965;
647 intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2);
648 intel_de_posting_read(dev_priv, BLC_PWM_CTL2);
649 intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
650
651 intel_backlight_set_pwm_level(conn_state, level);
652}
653
654static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
655 const struct drm_connector_state *conn_state, u32 level)
656{
657 struct intel_connector *connector = to_intel_connector(conn_state->connector);
658 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
659 struct intel_panel *panel = &connector->panel;
660 enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
661 u32 ctl, ctl2;
662
663 ctl2 = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
664 if (ctl2 & BLM_PWM_ENABLE) {
665 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
666 ctl2 &= ~BLM_PWM_ENABLE;
667 intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe), ctl2);
668 }
669
670 ctl = panel->backlight.pwm_level_max << 16;
671 intel_de_write(dev_priv, VLV_BLC_PWM_CTL(pipe), ctl);
672
673 /* XXX: combine this into above write? */
674 intel_backlight_set_pwm_level(conn_state, level);
675
676 ctl2 = 0;
677 if (panel->backlight.active_low_pwm)
678 ctl2 |= BLM_POLARITY_I965;
679 intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe), ctl2);
680 intel_de_posting_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
681 intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe),
682 ctl2 | BLM_PWM_ENABLE);
683}
684
685static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,
686 const struct drm_connector_state *conn_state, u32 level)
687{
688 struct intel_connector *connector = to_intel_connector(conn_state->connector);
689 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
690 struct intel_panel *panel = &connector->panel;
691 enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
692 u32 pwm_ctl, val;
693
694 /* Controller 1 uses the utility pin. */
695 if (panel->backlight.controller == 1) {
696 val = intel_de_read(dev_priv, UTIL_PIN_CTL);
697 if (val & UTIL_PIN_ENABLE) {
698 drm_dbg_kms(&dev_priv->drm,
699 "util pin already enabled\n");
700 val &= ~UTIL_PIN_ENABLE;
701 intel_de_write(dev_priv, UTIL_PIN_CTL, val);
702 }
703
704 val = 0;
705 if (panel->backlight.util_pin_active_low)
706 val |= UTIL_PIN_POLARITY;
707 intel_de_write(dev_priv, UTIL_PIN_CTL,
708 val | UTIL_PIN_PIPE(pipe) | UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
709 }
710
711 pwm_ctl = intel_de_read(dev_priv,
712 BXT_BLC_PWM_CTL(panel->backlight.controller));
713 if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
714 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
715 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
716 intel_de_write(dev_priv,
717 BXT_BLC_PWM_CTL(panel->backlight.controller),
718 pwm_ctl);
719 }
720
721 intel_de_write(dev_priv,
722 BXT_BLC_PWM_FREQ(panel->backlight.controller),
723 panel->backlight.pwm_level_max);
724
725 intel_backlight_set_pwm_level(conn_state, level);
726
727 pwm_ctl = 0;
728 if (panel->backlight.active_low_pwm)
729 pwm_ctl |= BXT_BLC_PWM_POLARITY;
730
731 intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
732 pwm_ctl);
733 intel_de_posting_read(dev_priv,
734 BXT_BLC_PWM_CTL(panel->backlight.controller));
735 intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
736 pwm_ctl | BXT_BLC_PWM_ENABLE);
737}
738
739static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,
740 const struct drm_connector_state *conn_state, u32 level)
741{
742 struct intel_connector *connector = to_intel_connector(conn_state->connector);
743 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
744 struct intel_panel *panel = &connector->panel;
745 u32 pwm_ctl;
746
747 pwm_ctl = intel_de_read(dev_priv,
748 BXT_BLC_PWM_CTL(panel->backlight.controller));
749 if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
750 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
751 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
752 intel_de_write(dev_priv,
753 BXT_BLC_PWM_CTL(panel->backlight.controller),
754 pwm_ctl);
755 }
756
757 intel_de_write(dev_priv,
758 BXT_BLC_PWM_FREQ(panel->backlight.controller),
759 panel->backlight.pwm_level_max);
760
761 intel_backlight_set_pwm_level(conn_state, level);
762
763 pwm_ctl = 0;
764 if (panel->backlight.active_low_pwm)
765 pwm_ctl |= BXT_BLC_PWM_POLARITY;
766
767 intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
768 pwm_ctl);
769 intel_de_posting_read(dev_priv,
770 BXT_BLC_PWM_CTL(panel->backlight.controller));
771 intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
772 pwm_ctl | BXT_BLC_PWM_ENABLE);
773}
774
775static void ext_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
776 const struct drm_connector_state *conn_state, u32 level)
777{
778 struct intel_connector *connector = to_intel_connector(conn_state->connector);
779 struct intel_panel *panel = &connector->panel;
780
781 pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
782 panel->backlight.pwm_state.enabled = true;
783 pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
784}
785
786static void __intel_backlight_enable(const struct intel_crtc_state *crtc_state,
787 const struct drm_connector_state *conn_state)
788{
789 struct intel_connector *connector = to_intel_connector(conn_state->connector);
790 struct intel_panel *panel = &connector->panel;
791
792 WARN_ON(panel->backlight.max == 0);
793
794 if (panel->backlight.level <= panel->backlight.min) {
795 panel->backlight.level = panel->backlight.max;
796 if (panel->backlight.device)
797 panel->backlight.device->props.brightness =
798 scale_hw_to_user(connector,
799 panel->backlight.level,
800 panel->backlight.device->props.max_brightness);
801 }
802
803 panel->backlight.funcs->enable(crtc_state, conn_state, panel->backlight.level);
804 panel->backlight.enabled = true;
805 if (panel->backlight.device)
806 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
807}
808
809void intel_backlight_enable(const struct intel_crtc_state *crtc_state,
810 const struct drm_connector_state *conn_state)
811{
812 struct intel_connector *connector = to_intel_connector(conn_state->connector);
813 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
814 struct intel_panel *panel = &connector->panel;
815 enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
816
817 if (!panel->backlight.present)
818 return;
819
820 drm_dbg_kms(&dev_priv->drm, "pipe %c\n", pipe_name(pipe));
821
822 mutex_lock(&dev_priv->display.backlight.lock);
823
824 __intel_backlight_enable(crtc_state, conn_state);
825
826 mutex_unlock(&dev_priv->display.backlight.lock);
827}
828
829#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
830static u32 intel_panel_get_backlight(struct intel_connector *connector)
831{
832 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
833 struct intel_panel *panel = &connector->panel;
834 u32 val = 0;
835
836 mutex_lock(&dev_priv->display.backlight.lock);
837
838 if (panel->backlight.enabled)
839 val = panel->backlight.funcs->get(connector, intel_connector_get_pipe(connector));
840
841 mutex_unlock(&dev_priv->display.backlight.lock);
842
843 drm_dbg_kms(&dev_priv->drm, "get backlight PWM = %d\n", val);
844 return val;
845}
846
847/* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
848static u32 scale_user_to_hw(struct intel_connector *connector,
849 u32 user_level, u32 user_max)
850{
851 struct intel_panel *panel = &connector->panel;
852
853 return scale(user_level, 0, user_max,
854 panel->backlight.min, panel->backlight.max);
855}
856
857/* set backlight brightness to level in range [0..max], scaling wrt hw min */
858static void intel_panel_set_backlight(const struct drm_connector_state *conn_state,
859 u32 user_level, u32 user_max)
860{
861 struct intel_connector *connector = to_intel_connector(conn_state->connector);
862 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
863 struct intel_panel *panel = &connector->panel;
864 u32 hw_level;
865
866 if (!panel->backlight.present)
867 return;
868
869 mutex_lock(&dev_priv->display.backlight.lock);
870
871 drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
872
873 hw_level = scale_user_to_hw(connector, user_level, user_max);
874 panel->backlight.level = hw_level;
875
876 if (panel->backlight.enabled)
877 intel_panel_actually_set_backlight(conn_state, hw_level);
878
879 mutex_unlock(&dev_priv->display.backlight.lock);
880}
881
882static int intel_backlight_device_update_status(struct backlight_device *bd)
883{
884 struct intel_connector *connector = bl_get_data(bd);
885 struct intel_panel *panel = &connector->panel;
886 struct drm_device *dev = connector->base.dev;
887
888 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
889 DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
890 bd->props.brightness, bd->props.max_brightness);
891 intel_panel_set_backlight(connector->base.state, bd->props.brightness,
892 bd->props.max_brightness);
893
894 /*
895 * Allow flipping bl_power as a sub-state of enabled. Sadly the
896 * backlight class device does not make it easy to differentiate
897 * between callbacks for brightness and bl_power, so our backlight_power
898 * callback needs to take this into account.
899 */
900 if (panel->backlight.enabled) {
901 if (panel->backlight.power) {
902 bool enable = bd->props.power == FB_BLANK_UNBLANK &&
903 bd->props.brightness != 0;
904 panel->backlight.power(connector, enable);
905 }
906 } else {
907 bd->props.power = FB_BLANK_POWERDOWN;
908 }
909
910 drm_modeset_unlock(&dev->mode_config.connection_mutex);
911 return 0;
912}
913
914static int intel_backlight_device_get_brightness(struct backlight_device *bd)
915{
916 struct intel_connector *connector = bl_get_data(bd);
917 struct drm_device *dev = connector->base.dev;
918 struct drm_i915_private *dev_priv = to_i915(dev);
919 intel_wakeref_t wakeref;
920 int ret = 0;
921
922 with_intel_runtime_pm(&dev_priv->runtime_pm, wakeref) {
923 u32 hw_level;
924
925 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
926
927 hw_level = intel_panel_get_backlight(connector);
928 ret = scale_hw_to_user(connector,
929 hw_level, bd->props.max_brightness);
930
931 drm_modeset_unlock(&dev->mode_config.connection_mutex);
932 }
933
934 return ret;
935}
936
937static const struct backlight_ops intel_backlight_device_ops = {
938 .update_status = intel_backlight_device_update_status,
939 .get_brightness = intel_backlight_device_get_brightness,
940};
941
942int intel_backlight_device_register(struct intel_connector *connector)
943{
944 struct drm_i915_private *i915 = to_i915(connector->base.dev);
945 struct intel_panel *panel = &connector->panel;
946 struct backlight_properties props;
947 struct backlight_device *bd;
948 const char *name;
949 int ret = 0;
950
951 if (WARN_ON(panel->backlight.device))
952 return -ENODEV;
953
954 if (!panel->backlight.present)
955 return 0;
956
957 WARN_ON(panel->backlight.max == 0);
958
959 if (!acpi_video_backlight_use_native()) {
960 drm_info(&i915->drm, "Skipping intel_backlight registration\n");
961 return 0;
962 }
963
964 memset(&props, 0, sizeof(props));
965 props.type = BACKLIGHT_RAW;
966
967 /*
968 * Note: Everything should work even if the backlight device max
969 * presented to the userspace is arbitrarily chosen.
970 */
971 props.max_brightness = panel->backlight.max;
972 props.brightness = scale_hw_to_user(connector,
973 panel->backlight.level,
974 props.max_brightness);
975
976 if (panel->backlight.enabled)
977 props.power = FB_BLANK_UNBLANK;
978 else
979 props.power = FB_BLANK_POWERDOWN;
980
981 name = kstrdup("intel_backlight", GFP_KERNEL);
982 if (!name)
983 return -ENOMEM;
984
985 bd = backlight_device_get_by_name(name);
986 if (bd) {
987 put_device(&bd->dev);
988 /*
989 * Using the same name independent of the drm device or connector
990 * prevents registration of multiple backlight devices in the
991 * driver. However, we need to use the default name for backward
992 * compatibility. Use unique names for subsequent backlight devices as a
993 * fallback when the default name already exists.
994 */
995 kfree(name);
996 name = kasprintf(GFP_KERNEL, "card%d-%s-backlight",
997 i915->drm.primary->index, connector->base.name);
998 if (!name)
999 return -ENOMEM;
1000 }
1001 bd = backlight_device_register(name, connector->base.kdev, connector,
1002 &intel_backlight_device_ops, &props);
1003
1004 if (IS_ERR(bd)) {
1005 drm_err(&i915->drm,
1006 "[CONNECTOR:%d:%s] backlight device %s register failed: %ld\n",
1007 connector->base.base.id, connector->base.name, name, PTR_ERR(bd));
1008 ret = PTR_ERR(bd);
1009 goto out;
1010 }
1011
1012 panel->backlight.device = bd;
1013
1014 drm_dbg_kms(&i915->drm,
1015 "[CONNECTOR:%d:%s] backlight device %s registered\n",
1016 connector->base.base.id, connector->base.name, name);
1017
1018out:
1019 kfree(name);
1020
1021 return ret;
1022}
1023
1024void intel_backlight_device_unregister(struct intel_connector *connector)
1025{
1026 struct intel_panel *panel = &connector->panel;
1027
1028 if (panel->backlight.device) {
1029 backlight_device_unregister(panel->backlight.device);
1030 panel->backlight.device = NULL;
1031 }
1032}
1033#endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1034
1035/*
1036 * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
1037 * PWM increment = 1
1038 */
1039static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1040{
1041 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1042
1043 return DIV_ROUND_CLOSEST(KHz(RUNTIME_INFO(dev_priv)->rawclk_freq),
1044 pwm_freq_hz);
1045}
1046
1047/*
1048 * BXT: PWM clock frequency = 19.2 MHz.
1049 */
1050static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1051{
1052 return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz);
1053}
1054
1055/*
1056 * SPT: This value represents the period of the PWM stream in clock periods
1057 * multiplied by 16 (default increment) or 128 (alternate increment selected in
1058 * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1059 */
1060static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1061{
1062 struct intel_panel *panel = &connector->panel;
1063 u32 mul;
1064
1065 if (panel->backlight.alternate_pwm_increment)
1066 mul = 128;
1067 else
1068 mul = 16;
1069
1070 return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz * mul);
1071}
1072
1073/*
1074 * LPT: This value represents the period of the PWM stream in clock periods
1075 * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1076 * LPT SOUTH_CHICKEN2 register bit 5).
1077 */
1078static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1079{
1080 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1081 struct intel_panel *panel = &connector->panel;
1082 u32 mul, clock;
1083
1084 if (panel->backlight.alternate_pwm_increment)
1085 mul = 16;
1086 else
1087 mul = 128;
1088
1089 if (HAS_PCH_LPT_H(dev_priv))
1090 clock = MHz(135); /* LPT:H */
1091 else
1092 clock = MHz(24); /* LPT:LP */
1093
1094 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1095}
1096
1097/*
1098 * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1099 * display raw clocks multiplied by 128.
1100 */
1101static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1102{
1103 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1104
1105 return DIV_ROUND_CLOSEST(KHz(RUNTIME_INFO(dev_priv)->rawclk_freq),
1106 pwm_freq_hz * 128);
1107}
1108
1109/*
1110 * Gen2: This field determines the number of time base events (display core
1111 * clock frequency/32) in total for a complete cycle of modulated backlight
1112 * control.
1113 *
1114 * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1115 * divided by 32.
1116 */
1117static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1118{
1119 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1120 int clock;
1121
1122 if (IS_PINEVIEW(dev_priv))
1123 clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
1124 else
1125 clock = KHz(dev_priv->display.cdclk.hw.cdclk);
1126
1127 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 32);
1128}
1129
1130/*
1131 * Gen4: This value represents the period of the PWM stream in display core
1132 * clocks ([DevCTG] HRAW clocks) multiplied by 128.
1133 *
1134 */
1135static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1136{
1137 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1138 int clock;
1139
1140 if (IS_G4X(dev_priv))
1141 clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
1142 else
1143 clock = KHz(dev_priv->display.cdclk.hw.cdclk);
1144
1145 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 128);
1146}
1147
1148/*
1149 * VLV: This value represents the period of the PWM stream in display core
1150 * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1151 * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1152 */
1153static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1154{
1155 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1156 int mul, clock;
1157
1158 if ((intel_de_read(dev_priv, CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
1159 if (IS_CHERRYVIEW(dev_priv))
1160 clock = KHz(19200);
1161 else
1162 clock = MHz(25);
1163 mul = 16;
1164 } else {
1165 clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
1166 mul = 128;
1167 }
1168
1169 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1170}
1171
1172static u16 get_vbt_pwm_freq(struct intel_connector *connector)
1173{
1174 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1175 u16 pwm_freq_hz = connector->panel.vbt.backlight.pwm_freq_hz;
1176
1177 if (pwm_freq_hz) {
1178 drm_dbg_kms(&dev_priv->drm,
1179 "VBT defined backlight frequency %u Hz\n",
1180 pwm_freq_hz);
1181 } else {
1182 pwm_freq_hz = 200;
1183 drm_dbg_kms(&dev_priv->drm,
1184 "default backlight frequency %u Hz\n",
1185 pwm_freq_hz);
1186 }
1187
1188 return pwm_freq_hz;
1189}
1190
1191static u32 get_backlight_max_vbt(struct intel_connector *connector)
1192{
1193 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1194 struct intel_panel *panel = &connector->panel;
1195 u16 pwm_freq_hz = get_vbt_pwm_freq(connector);
1196 u32 pwm;
1197
1198 if (!panel->backlight.pwm_funcs->hz_to_pwm) {
1199 drm_dbg_kms(&dev_priv->drm,
1200 "backlight frequency conversion not supported\n");
1201 return 0;
1202 }
1203
1204 pwm = panel->backlight.pwm_funcs->hz_to_pwm(connector, pwm_freq_hz);
1205 if (!pwm) {
1206 drm_dbg_kms(&dev_priv->drm,
1207 "backlight frequency conversion failed\n");
1208 return 0;
1209 }
1210
1211 return pwm;
1212}
1213
1214/*
1215 * Note: The setup hooks can't assume pipe is set!
1216 */
1217static u32 get_backlight_min_vbt(struct intel_connector *connector)
1218{
1219 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1220 struct intel_panel *panel = &connector->panel;
1221 int min;
1222
1223 drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_level_max == 0);
1224
1225 /*
1226 * XXX: If the vbt value is 255, it makes min equal to max, which leads
1227 * to problems. There are such machines out there. Either our
1228 * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1229 * against this by letting the minimum be at most (arbitrarily chosen)
1230 * 25% of the max.
1231 */
1232 min = clamp_t(int, connector->panel.vbt.backlight.min_brightness, 0, 64);
1233 if (min != connector->panel.vbt.backlight.min_brightness) {
1234 drm_dbg_kms(&dev_priv->drm,
1235 "clamping VBT min backlight %d/255 to %d/255\n",
1236 connector->panel.vbt.backlight.min_brightness, min);
1237 }
1238
1239 /* vbt value is a coefficient in range [0..255] */
1240 return scale(min, 0, 255, 0, panel->backlight.pwm_level_max);
1241}
1242
1243static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1244{
1245 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1246 struct intel_panel *panel = &connector->panel;
1247 u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1248 bool alt, cpu_mode;
1249
1250 if (HAS_PCH_LPT(dev_priv))
1251 alt = intel_de_read(dev_priv, SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY;
1252 else
1253 alt = intel_de_read(dev_priv, SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;
1254 panel->backlight.alternate_pwm_increment = alt;
1255
1256 pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
1257 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1258
1259 pch_ctl2 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2);
1260 panel->backlight.pwm_level_max = pch_ctl2 >> 16;
1261
1262 cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
1263
1264 if (!panel->backlight.pwm_level_max)
1265 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1266
1267 if (!panel->backlight.pwm_level_max)
1268 return -ENODEV;
1269
1270 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1271
1272 panel->backlight.pwm_enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;
1273
1274 cpu_mode = panel->backlight.pwm_enabled && HAS_PCH_LPT(dev_priv) &&
1275 !(pch_ctl1 & BLM_PCH_OVERRIDE_ENABLE) &&
1276 (cpu_ctl2 & BLM_PWM_ENABLE);
1277
1278 if (cpu_mode) {
1279 val = pch_get_backlight(connector, unused);
1280
1281 drm_dbg_kms(&dev_priv->drm,
1282 "CPU backlight register was enabled, switching to PCH override\n");
1283
1284 /* Write converted CPU PWM value to PCH override register */
1285 lpt_set_backlight(connector->base.state, val);
1286 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
1287 pch_ctl1 | BLM_PCH_OVERRIDE_ENABLE);
1288
1289 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2,
1290 cpu_ctl2 & ~BLM_PWM_ENABLE);
1291 }
1292
1293 return 0;
1294}
1295
1296static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
1297{
1298 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1299 struct intel_panel *panel = &connector->panel;
1300 u32 cpu_ctl2, pch_ctl1, pch_ctl2;
1301
1302 pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
1303 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1304
1305 pch_ctl2 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2);
1306 panel->backlight.pwm_level_max = pch_ctl2 >> 16;
1307
1308 if (!panel->backlight.pwm_level_max)
1309 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1310
1311 if (!panel->backlight.pwm_level_max)
1312 return -ENODEV;
1313
1314 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1315
1316 cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
1317 panel->backlight.pwm_enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1318 (pch_ctl1 & BLM_PCH_PWM_ENABLE);
1319
1320 return 0;
1321}
1322
1323static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
1324{
1325 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1326 struct intel_panel *panel = &connector->panel;
1327 u32 ctl, val;
1328
1329 ctl = intel_de_read(dev_priv, BLC_PWM_CTL);
1330
1331 if (DISPLAY_VER(dev_priv) == 2 || IS_I915GM(dev_priv) || IS_I945GM(dev_priv))
1332 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1333
1334 if (IS_PINEVIEW(dev_priv))
1335 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1336
1337 panel->backlight.pwm_level_max = ctl >> 17;
1338
1339 if (!panel->backlight.pwm_level_max) {
1340 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1341 panel->backlight.pwm_level_max >>= 1;
1342 }
1343
1344 if (!panel->backlight.pwm_level_max)
1345 return -ENODEV;
1346
1347 if (panel->backlight.combination_mode)
1348 panel->backlight.pwm_level_max *= 0xff;
1349
1350 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1351
1352 val = i9xx_get_backlight(connector, unused);
1353 val = intel_backlight_invert_pwm_level(connector, val);
1354 val = clamp(val, panel->backlight.pwm_level_min, panel->backlight.pwm_level_max);
1355
1356 panel->backlight.pwm_enabled = val != 0;
1357
1358 return 0;
1359}
1360
1361static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
1362{
1363 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1364 struct intel_panel *panel = &connector->panel;
1365 u32 ctl, ctl2;
1366
1367 ctl2 = intel_de_read(dev_priv, BLC_PWM_CTL2);
1368 panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1369 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1370
1371 ctl = intel_de_read(dev_priv, BLC_PWM_CTL);
1372 panel->backlight.pwm_level_max = ctl >> 16;
1373
1374 if (!panel->backlight.pwm_level_max)
1375 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1376
1377 if (!panel->backlight.pwm_level_max)
1378 return -ENODEV;
1379
1380 if (panel->backlight.combination_mode)
1381 panel->backlight.pwm_level_max *= 0xff;
1382
1383 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1384
1385 panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE;
1386
1387 return 0;
1388}
1389
1390static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1391{
1392 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1393 struct intel_panel *panel = &connector->panel;
1394 u32 ctl, ctl2;
1395
1396 if (drm_WARN_ON(&dev_priv->drm, pipe != PIPE_A && pipe != PIPE_B))
1397 return -ENODEV;
1398
1399 ctl2 = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
1400 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1401
1402 ctl = intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe));
1403 panel->backlight.pwm_level_max = ctl >> 16;
1404
1405 if (!panel->backlight.pwm_level_max)
1406 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1407
1408 if (!panel->backlight.pwm_level_max)
1409 return -ENODEV;
1410
1411 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1412
1413 panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE;
1414
1415 return 0;
1416}
1417
1418static int
1419bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1420{
1421 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1422 struct intel_panel *panel = &connector->panel;
1423 u32 pwm_ctl, val;
1424
1425 panel->backlight.controller = connector->panel.vbt.backlight.controller;
1426
1427 pwm_ctl = intel_de_read(dev_priv,
1428 BXT_BLC_PWM_CTL(panel->backlight.controller));
1429
1430 /* Controller 1 uses the utility pin. */
1431 if (panel->backlight.controller == 1) {
1432 val = intel_de_read(dev_priv, UTIL_PIN_CTL);
1433 panel->backlight.util_pin_active_low =
1434 val & UTIL_PIN_POLARITY;
1435 }
1436
1437 panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1438 panel->backlight.pwm_level_max =
1439 intel_de_read(dev_priv, BXT_BLC_PWM_FREQ(panel->backlight.controller));
1440
1441 if (!panel->backlight.pwm_level_max)
1442 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1443
1444 if (!panel->backlight.pwm_level_max)
1445 return -ENODEV;
1446
1447 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1448
1449 panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1450
1451 return 0;
1452}
1453
1454static int
1455cnp_setup_backlight(struct intel_connector *connector, enum pipe unused)
1456{
1457 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1458 struct intel_panel *panel = &connector->panel;
1459 u32 pwm_ctl;
1460
1461 /*
1462 * CNP has the BXT implementation of backlight, but with only one
1463 * controller. TODO: ICP has multiple controllers but we only use
1464 * controller 0 for now.
1465 */
1466 panel->backlight.controller = 0;
1467
1468 pwm_ctl = intel_de_read(dev_priv,
1469 BXT_BLC_PWM_CTL(panel->backlight.controller));
1470
1471 panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1472 panel->backlight.pwm_level_max =
1473 intel_de_read(dev_priv, BXT_BLC_PWM_FREQ(panel->backlight.controller));
1474
1475 if (!panel->backlight.pwm_level_max)
1476 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1477
1478 if (!panel->backlight.pwm_level_max)
1479 return -ENODEV;
1480
1481 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1482
1483 panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1484
1485 return 0;
1486}
1487
1488static int ext_pwm_setup_backlight(struct intel_connector *connector,
1489 enum pipe pipe)
1490{
1491 struct drm_device *dev = connector->base.dev;
1492 struct drm_i915_private *dev_priv = to_i915(dev);
1493 struct intel_panel *panel = &connector->panel;
1494 const char *desc;
1495 u32 level;
1496
1497 /* Get the right PWM chip for DSI backlight according to VBT */
1498 if (connector->panel.vbt.dsi.config->pwm_blc == PPS_BLC_PMIC) {
1499 panel->backlight.pwm = pwm_get(dev->dev, "pwm_pmic_backlight");
1500 desc = "PMIC";
1501 } else {
1502 panel->backlight.pwm = pwm_get(dev->dev, "pwm_soc_backlight");
1503 desc = "SoC";
1504 }
1505
1506 if (IS_ERR(panel->backlight.pwm)) {
1507 drm_err(&dev_priv->drm, "Failed to get the %s PWM chip\n",
1508 desc);
1509 panel->backlight.pwm = NULL;
1510 return -ENODEV;
1511 }
1512
1513 panel->backlight.pwm_level_max = 100; /* 100% */
1514 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1515
1516 if (pwm_is_enabled(panel->backlight.pwm)) {
1517 /* PWM is already enabled, use existing settings */
1518 pwm_get_state(panel->backlight.pwm, &panel->backlight.pwm_state);
1519
1520 level = pwm_get_relative_duty_cycle(&panel->backlight.pwm_state,
1521 100);
1522 level = intel_backlight_invert_pwm_level(connector, level);
1523 panel->backlight.pwm_enabled = true;
1524
1525 drm_dbg_kms(&dev_priv->drm, "PWM already enabled at freq %ld, VBT freq %d, level %d\n",
1526 NSEC_PER_SEC / (unsigned long)panel->backlight.pwm_state.period,
1527 get_vbt_pwm_freq(connector), level);
1528 } else {
1529 /* Set period from VBT frequency, leave other settings at 0. */
1530 panel->backlight.pwm_state.period =
1531 NSEC_PER_SEC / get_vbt_pwm_freq(connector);
1532 }
1533
1534 drm_info(&dev_priv->drm, "Using %s PWM for LCD backlight control\n",
1535 desc);
1536 return 0;
1537}
1538
1539static void intel_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
1540{
1541 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1542 struct intel_panel *panel = &connector->panel;
1543
1544 panel->backlight.pwm_funcs->set(conn_state,
1545 intel_backlight_invert_pwm_level(connector, level));
1546}
1547
1548static u32 intel_pwm_get_backlight(struct intel_connector *connector, enum pipe pipe)
1549{
1550 struct intel_panel *panel = &connector->panel;
1551
1552 return intel_backlight_invert_pwm_level(connector,
1553 panel->backlight.pwm_funcs->get(connector, pipe));
1554}
1555
1556static void intel_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
1557 const struct drm_connector_state *conn_state, u32 level)
1558{
1559 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1560 struct intel_panel *panel = &connector->panel;
1561
1562 panel->backlight.pwm_funcs->enable(crtc_state, conn_state,
1563 intel_backlight_invert_pwm_level(connector, level));
1564}
1565
1566static void intel_pwm_disable_backlight(const struct drm_connector_state *conn_state, u32 level)
1567{
1568 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1569 struct intel_panel *panel = &connector->panel;
1570
1571 panel->backlight.pwm_funcs->disable(conn_state,
1572 intel_backlight_invert_pwm_level(connector, level));
1573}
1574
1575static int intel_pwm_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1576{
1577 struct intel_panel *panel = &connector->panel;
1578 int ret = panel->backlight.pwm_funcs->setup(connector, pipe);
1579
1580 if (ret < 0)
1581 return ret;
1582
1583 panel->backlight.min = panel->backlight.pwm_level_min;
1584 panel->backlight.max = panel->backlight.pwm_level_max;
1585 panel->backlight.level = intel_pwm_get_backlight(connector, pipe);
1586 panel->backlight.enabled = panel->backlight.pwm_enabled;
1587
1588 return 0;
1589}
1590
1591void intel_backlight_update(struct intel_atomic_state *state,
1592 struct intel_encoder *encoder,
1593 const struct intel_crtc_state *crtc_state,
1594 const struct drm_connector_state *conn_state)
1595{
1596 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1597 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1598 struct intel_panel *panel = &connector->panel;
1599
1600 if (!panel->backlight.present)
1601 return;
1602
1603 mutex_lock(&dev_priv->display.backlight.lock);
1604 if (!panel->backlight.enabled)
1605 __intel_backlight_enable(crtc_state, conn_state);
1606
1607 mutex_unlock(&dev_priv->display.backlight.lock);
1608}
1609
1610int intel_backlight_setup(struct intel_connector *connector, enum pipe pipe)
1611{
1612 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1613 struct intel_panel *panel = &connector->panel;
1614 int ret;
1615
1616 if (!connector->panel.vbt.backlight.present) {
1617 if (intel_has_quirk(dev_priv, QUIRK_BACKLIGHT_PRESENT)) {
1618 drm_dbg_kms(&dev_priv->drm,
1619 "no backlight present per VBT, but present per quirk\n");
1620 } else {
1621 drm_dbg_kms(&dev_priv->drm,
1622 "no backlight present per VBT\n");
1623 return 0;
1624 }
1625 }
1626
1627 /* ensure intel_panel has been initialized first */
1628 if (drm_WARN_ON(&dev_priv->drm, !panel->backlight.funcs))
1629 return -ENODEV;
1630
1631 /* set level and max in panel struct */
1632 mutex_lock(&dev_priv->display.backlight.lock);
1633 ret = panel->backlight.funcs->setup(connector, pipe);
1634 mutex_unlock(&dev_priv->display.backlight.lock);
1635
1636 if (ret) {
1637 drm_dbg_kms(&dev_priv->drm,
1638 "failed to setup backlight for connector %s\n",
1639 connector->base.name);
1640 return ret;
1641 }
1642
1643 panel->backlight.present = true;
1644
1645 drm_dbg_kms(&dev_priv->drm,
1646 "Connector %s backlight initialized, %s, brightness %u/%u\n",
1647 connector->base.name,
1648 str_enabled_disabled(panel->backlight.enabled),
1649 panel->backlight.level, panel->backlight.max);
1650
1651 return 0;
1652}
1653
1654void intel_backlight_destroy(struct intel_panel *panel)
1655{
1656 /* dispose of the pwm */
1657 if (panel->backlight.pwm)
1658 pwm_put(panel->backlight.pwm);
1659
1660 panel->backlight.present = false;
1661}
1662
1663static const struct intel_panel_bl_funcs bxt_pwm_funcs = {
1664 .setup = bxt_setup_backlight,
1665 .enable = bxt_enable_backlight,
1666 .disable = bxt_disable_backlight,
1667 .set = bxt_set_backlight,
1668 .get = bxt_get_backlight,
1669 .hz_to_pwm = bxt_hz_to_pwm,
1670};
1671
1672static const struct intel_panel_bl_funcs cnp_pwm_funcs = {
1673 .setup = cnp_setup_backlight,
1674 .enable = cnp_enable_backlight,
1675 .disable = cnp_disable_backlight,
1676 .set = bxt_set_backlight,
1677 .get = bxt_get_backlight,
1678 .hz_to_pwm = cnp_hz_to_pwm,
1679};
1680
1681static const struct intel_panel_bl_funcs lpt_pwm_funcs = {
1682 .setup = lpt_setup_backlight,
1683 .enable = lpt_enable_backlight,
1684 .disable = lpt_disable_backlight,
1685 .set = lpt_set_backlight,
1686 .get = lpt_get_backlight,
1687 .hz_to_pwm = lpt_hz_to_pwm,
1688};
1689
1690static const struct intel_panel_bl_funcs spt_pwm_funcs = {
1691 .setup = lpt_setup_backlight,
1692 .enable = lpt_enable_backlight,
1693 .disable = lpt_disable_backlight,
1694 .set = lpt_set_backlight,
1695 .get = lpt_get_backlight,
1696 .hz_to_pwm = spt_hz_to_pwm,
1697};
1698
1699static const struct intel_panel_bl_funcs pch_pwm_funcs = {
1700 .setup = pch_setup_backlight,
1701 .enable = pch_enable_backlight,
1702 .disable = pch_disable_backlight,
1703 .set = pch_set_backlight,
1704 .get = pch_get_backlight,
1705 .hz_to_pwm = pch_hz_to_pwm,
1706};
1707
1708static const struct intel_panel_bl_funcs ext_pwm_funcs = {
1709 .setup = ext_pwm_setup_backlight,
1710 .enable = ext_pwm_enable_backlight,
1711 .disable = ext_pwm_disable_backlight,
1712 .set = ext_pwm_set_backlight,
1713 .get = ext_pwm_get_backlight,
1714};
1715
1716static const struct intel_panel_bl_funcs vlv_pwm_funcs = {
1717 .setup = vlv_setup_backlight,
1718 .enable = vlv_enable_backlight,
1719 .disable = vlv_disable_backlight,
1720 .set = vlv_set_backlight,
1721 .get = vlv_get_backlight,
1722 .hz_to_pwm = vlv_hz_to_pwm,
1723};
1724
1725static const struct intel_panel_bl_funcs i965_pwm_funcs = {
1726 .setup = i965_setup_backlight,
1727 .enable = i965_enable_backlight,
1728 .disable = i965_disable_backlight,
1729 .set = i9xx_set_backlight,
1730 .get = i9xx_get_backlight,
1731 .hz_to_pwm = i965_hz_to_pwm,
1732};
1733
1734static const struct intel_panel_bl_funcs i9xx_pwm_funcs = {
1735 .setup = i9xx_setup_backlight,
1736 .enable = i9xx_enable_backlight,
1737 .disable = i9xx_disable_backlight,
1738 .set = i9xx_set_backlight,
1739 .get = i9xx_get_backlight,
1740 .hz_to_pwm = i9xx_hz_to_pwm,
1741};
1742
1743static const struct intel_panel_bl_funcs pwm_bl_funcs = {
1744 .setup = intel_pwm_setup_backlight,
1745 .enable = intel_pwm_enable_backlight,
1746 .disable = intel_pwm_disable_backlight,
1747 .set = intel_pwm_set_backlight,
1748 .get = intel_pwm_get_backlight,
1749};
1750
1751/* Set up chip specific backlight functions */
1752void intel_backlight_init_funcs(struct intel_panel *panel)
1753{
1754 struct intel_connector *connector =
1755 container_of(panel, struct intel_connector, panel);
1756 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1757
1758 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&
1759 intel_dsi_dcs_init_backlight_funcs(connector) == 0)
1760 return;
1761
1762 if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv)) {
1763 panel->backlight.pwm_funcs = &bxt_pwm_funcs;
1764 } else if (INTEL_PCH_TYPE(dev_priv) >= PCH_CNP) {
1765 panel->backlight.pwm_funcs = &cnp_pwm_funcs;
1766 } else if (INTEL_PCH_TYPE(dev_priv) >= PCH_LPT) {
1767 if (HAS_PCH_LPT(dev_priv))
1768 panel->backlight.pwm_funcs = &lpt_pwm_funcs;
1769 else
1770 panel->backlight.pwm_funcs = &spt_pwm_funcs;
1771 } else if (HAS_PCH_SPLIT(dev_priv)) {
1772 panel->backlight.pwm_funcs = &pch_pwm_funcs;
1773 } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
1774 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) {
1775 panel->backlight.pwm_funcs = &ext_pwm_funcs;
1776 } else {
1777 panel->backlight.pwm_funcs = &vlv_pwm_funcs;
1778 }
1779 } else if (DISPLAY_VER(dev_priv) == 4) {
1780 panel->backlight.pwm_funcs = &i965_pwm_funcs;
1781 } else {
1782 panel->backlight.pwm_funcs = &i9xx_pwm_funcs;
1783 }
1784
1785 if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP) {
1786 if (intel_dp_aux_init_backlight_funcs(connector) == 0)
1787 return;
1788
1789 if (!intel_has_quirk(dev_priv, QUIRK_NO_PPS_BACKLIGHT_POWER_HOOK))
1790 connector->panel.backlight.power = intel_pps_backlight_power;
1791 }
1792
1793 /* We're using a standard PWM backlight interface */
1794 panel->backlight.funcs = &pwm_bl_funcs;
1795}