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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 intel_display *display = to_intel_display(connector);
87 struct intel_panel *panel = &connector->panel;
88
89 drm_WARN_ON(display->drm, panel->backlight.pwm_level_max == 0);
90
91 if (display->params.invert_brightness < 0)
92 return val;
93
94 if (display->params.invert_brightness > 0 ||
95 intel_has_quirk(display, 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, "[CONNECTOR:%d:%s] set backlight PWM = %d\n",
109 connector->base.base.id, connector->base.name, val);
110 panel->backlight.pwm_funcs->set(conn_state, val);
111}
112
113u32 intel_backlight_level_to_pwm(struct intel_connector *connector, u32 val)
114{
115 struct drm_i915_private *i915 = to_i915(connector->base.dev);
116 struct intel_panel *panel = &connector->panel;
117
118 drm_WARN_ON_ONCE(&i915->drm,
119 panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0);
120
121 val = scale(val, panel->backlight.min, panel->backlight.max,
122 panel->backlight.pwm_level_min, panel->backlight.pwm_level_max);
123
124 return intel_backlight_invert_pwm_level(connector, val);
125}
126
127u32 intel_backlight_level_from_pwm(struct intel_connector *connector, u32 val)
128{
129 struct intel_display *display = to_intel_display(connector);
130 struct intel_panel *panel = &connector->panel;
131
132 drm_WARN_ON_ONCE(display->drm,
133 panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0);
134
135 if (display->params.invert_brightness > 0 ||
136 (display->params.invert_brightness == 0 &&
137 intel_has_quirk(display, QUIRK_INVERT_BRIGHTNESS)))
138 val = panel->backlight.pwm_level_max - (val - panel->backlight.pwm_level_min);
139
140 return scale(val, panel->backlight.pwm_level_min, panel->backlight.pwm_level_max,
141 panel->backlight.min, panel->backlight.max);
142}
143
144static u32 lpt_get_backlight(struct intel_connector *connector, enum pipe unused)
145{
146 struct drm_i915_private *i915 = to_i915(connector->base.dev);
147
148 return intel_de_read(i915, BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
149}
150
151static u32 pch_get_backlight(struct intel_connector *connector, enum pipe unused)
152{
153 struct drm_i915_private *i915 = to_i915(connector->base.dev);
154
155 return intel_de_read(i915, BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
156}
157
158static u32 i9xx_get_backlight(struct intel_connector *connector, enum pipe unused)
159{
160 struct drm_i915_private *i915 = to_i915(connector->base.dev);
161 struct intel_panel *panel = &connector->panel;
162 u32 val;
163
164 val = intel_de_read(i915, BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
165 if (DISPLAY_VER(i915) < 4)
166 val >>= 1;
167
168 if (panel->backlight.combination_mode) {
169 u8 lbpc;
170
171 pci_read_config_byte(to_pci_dev(i915->drm.dev), LBPC, &lbpc);
172 val *= lbpc;
173 }
174
175 return val;
176}
177
178static u32 vlv_get_backlight(struct intel_connector *connector, enum pipe pipe)
179{
180 struct drm_i915_private *i915 = to_i915(connector->base.dev);
181
182 if (drm_WARN_ON(&i915->drm, pipe != PIPE_A && pipe != PIPE_B))
183 return 0;
184
185 return intel_de_read(i915, VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
186}
187
188static u32 bxt_get_backlight(struct intel_connector *connector, enum pipe unused)
189{
190 struct drm_i915_private *i915 = to_i915(connector->base.dev);
191 struct intel_panel *panel = &connector->panel;
192
193 return intel_de_read(i915, BXT_BLC_PWM_DUTY(panel->backlight.controller));
194}
195
196static u32 ext_pwm_get_backlight(struct intel_connector *connector, enum pipe unused)
197{
198 struct intel_panel *panel = &connector->panel;
199 struct pwm_state state;
200
201 pwm_get_state(panel->backlight.pwm, &state);
202 return pwm_get_relative_duty_cycle(&state, 100);
203}
204
205static void lpt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
206{
207 struct intel_connector *connector = to_intel_connector(conn_state->connector);
208 struct drm_i915_private *i915 = to_i915(connector->base.dev);
209 u32 val;
210
211 val = intel_de_read(i915, BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
212 intel_de_write(i915, BLC_PWM_PCH_CTL2, val | level);
213}
214
215static void pch_set_backlight(const struct drm_connector_state *conn_state, u32 level)
216{
217 struct intel_connector *connector = to_intel_connector(conn_state->connector);
218 struct drm_i915_private *i915 = to_i915(connector->base.dev);
219 u32 tmp;
220
221 tmp = intel_de_read(i915, BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
222 intel_de_write(i915, BLC_PWM_CPU_CTL, tmp | level);
223}
224
225static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32 level)
226{
227 struct intel_connector *connector = to_intel_connector(conn_state->connector);
228 struct drm_i915_private *i915 = to_i915(connector->base.dev);
229 struct intel_panel *panel = &connector->panel;
230 u32 tmp, mask;
231
232 drm_WARN_ON(&i915->drm, panel->backlight.pwm_level_max == 0);
233
234 if (panel->backlight.combination_mode) {
235 u8 lbpc;
236
237 lbpc = level * 0xfe / panel->backlight.pwm_level_max + 1;
238 level /= lbpc;
239 pci_write_config_byte(to_pci_dev(i915->drm.dev), LBPC, lbpc);
240 }
241
242 if (DISPLAY_VER(i915) == 4) {
243 mask = BACKLIGHT_DUTY_CYCLE_MASK;
244 } else {
245 level <<= 1;
246 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
247 }
248
249 tmp = intel_de_read(i915, BLC_PWM_CTL) & ~mask;
250 intel_de_write(i915, BLC_PWM_CTL, tmp | level);
251}
252
253static void vlv_set_backlight(const struct drm_connector_state *conn_state, u32 level)
254{
255 struct intel_connector *connector = to_intel_connector(conn_state->connector);
256 struct drm_i915_private *i915 = to_i915(connector->base.dev);
257 enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
258 u32 tmp;
259
260 tmp = intel_de_read(i915, VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
261 intel_de_write(i915, VLV_BLC_PWM_CTL(pipe), tmp | level);
262}
263
264static void bxt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
265{
266 struct intel_connector *connector = to_intel_connector(conn_state->connector);
267 struct drm_i915_private *i915 = to_i915(connector->base.dev);
268 struct intel_panel *panel = &connector->panel;
269
270 intel_de_write(i915, BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
271}
272
273static void ext_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
274{
275 struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
276
277 pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
278 pwm_apply_might_sleep(panel->backlight.pwm, &panel->backlight.pwm_state);
279}
280
281static void
282intel_panel_actually_set_backlight(const struct drm_connector_state *conn_state, u32 level)
283{
284 struct intel_connector *connector = to_intel_connector(conn_state->connector);
285 struct drm_i915_private *i915 = to_i915(connector->base.dev);
286 struct intel_panel *panel = &connector->panel;
287
288 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] set backlight level = %d\n",
289 connector->base.base.id, connector->base.name, level);
290
291 panel->backlight.funcs->set(conn_state, level);
292}
293
294/* set backlight brightness to level in range [0..max], assuming hw min is
295 * respected.
296 */
297void intel_backlight_set_acpi(const struct drm_connector_state *conn_state,
298 u32 user_level, u32 user_max)
299{
300 struct intel_connector *connector = to_intel_connector(conn_state->connector);
301 struct drm_i915_private *i915 = to_i915(connector->base.dev);
302 struct intel_panel *panel = &connector->panel;
303 u32 hw_level;
304
305 /*
306 * Lack of crtc may occur during driver init because
307 * connection_mutex isn't held across the entire backlight
308 * setup + modeset readout, and the BIOS can issue the
309 * requests at any time.
310 */
311 if (!panel->backlight.present || !conn_state->crtc)
312 return;
313
314 mutex_lock(&i915->display.backlight.lock);
315
316 drm_WARN_ON(&i915->drm, panel->backlight.max == 0);
317
318 hw_level = clamp_user_to_hw(connector, user_level, user_max);
319 panel->backlight.level = hw_level;
320
321 if (panel->backlight.device)
322 panel->backlight.device->props.brightness =
323 scale_hw_to_user(connector,
324 panel->backlight.level,
325 panel->backlight.device->props.max_brightness);
326
327 if (panel->backlight.enabled)
328 intel_panel_actually_set_backlight(conn_state, hw_level);
329
330 mutex_unlock(&i915->display.backlight.lock);
331}
332
333static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
334{
335 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
336 struct drm_i915_private *i915 = to_i915(connector->base.dev);
337 u32 tmp;
338
339 intel_backlight_set_pwm_level(old_conn_state, level);
340
341 /*
342 * Although we don't support or enable CPU PWM with LPT/SPT based
343 * systems, it may have been enabled prior to loading the
344 * driver. Disable to avoid warnings on LCPLL disable.
345 *
346 * This needs rework if we need to add support for CPU PWM on PCH split
347 * platforms.
348 */
349 tmp = intel_de_read(i915, BLC_PWM_CPU_CTL2);
350 if (tmp & BLM_PWM_ENABLE) {
351 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] CPU backlight was enabled, disabling\n",
352 connector->base.base.id, connector->base.name);
353 intel_de_write(i915, BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
354 }
355
356 intel_de_rmw(i915, BLC_PWM_PCH_CTL1, BLM_PCH_PWM_ENABLE, 0);
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 *i915 = to_i915(connector->base.dev);
363
364 intel_backlight_set_pwm_level(old_conn_state, val);
365
366 intel_de_rmw(i915, BLC_PWM_CPU_CTL2, BLM_PWM_ENABLE, 0);
367
368 intel_de_rmw(i915, BLC_PWM_PCH_CTL1, BLM_PCH_PWM_ENABLE, 0);
369}
370
371static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
372{
373 intel_backlight_set_pwm_level(old_conn_state, val);
374}
375
376static void i965_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
377{
378 struct drm_i915_private *i915 = to_i915(old_conn_state->connector->dev);
379
380 intel_backlight_set_pwm_level(old_conn_state, val);
381
382 intel_de_rmw(i915, BLC_PWM_CTL2, BLM_PWM_ENABLE, 0);
383}
384
385static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
386{
387 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
388 struct drm_i915_private *i915 = to_i915(connector->base.dev);
389 enum pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe;
390
391 intel_backlight_set_pwm_level(old_conn_state, val);
392
393 intel_de_rmw(i915, VLV_BLC_PWM_CTL2(pipe), BLM_PWM_ENABLE, 0);
394}
395
396static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
397{
398 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
399 struct drm_i915_private *i915 = to_i915(connector->base.dev);
400 struct intel_panel *panel = &connector->panel;
401
402 intel_backlight_set_pwm_level(old_conn_state, val);
403
404 intel_de_rmw(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
405 BXT_BLC_PWM_ENABLE, 0);
406
407 if (panel->backlight.controller == 1)
408 intel_de_rmw(i915, UTIL_PIN_CTL, UTIL_PIN_ENABLE, 0);
409}
410
411static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
412{
413 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
414 struct drm_i915_private *i915 = to_i915(connector->base.dev);
415 struct intel_panel *panel = &connector->panel;
416
417 intel_backlight_set_pwm_level(old_conn_state, val);
418
419 intel_de_rmw(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
420 BXT_BLC_PWM_ENABLE, 0);
421}
422
423static void ext_pwm_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
424{
425 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
426 struct intel_panel *panel = &connector->panel;
427
428 intel_backlight_set_pwm_level(old_conn_state, level);
429
430 panel->backlight.pwm_state.enabled = false;
431 pwm_apply_might_sleep(panel->backlight.pwm, &panel->backlight.pwm_state);
432}
433
434void intel_backlight_disable(const struct drm_connector_state *old_conn_state)
435{
436 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
437 struct drm_i915_private *i915 = to_i915(connector->base.dev);
438 struct intel_panel *panel = &connector->panel;
439
440 if (!panel->backlight.present)
441 return;
442
443 /*
444 * Do not disable backlight on the vga_switcheroo path. When switching
445 * away from i915, the other client may depend on i915 to handle the
446 * backlight. This will leave the backlight on unnecessarily when
447 * another client is not activated.
448 */
449 if (i915->drm.switch_power_state == DRM_SWITCH_POWER_CHANGING) {
450 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] Skipping backlight disable on vga switch\n",
451 connector->base.base.id, connector->base.name);
452 return;
453 }
454
455 mutex_lock(&i915->display.backlight.lock);
456
457 if (panel->backlight.device)
458 panel->backlight.device->props.power = BACKLIGHT_POWER_OFF;
459 panel->backlight.enabled = false;
460 panel->backlight.funcs->disable(old_conn_state, 0);
461
462 mutex_unlock(&i915->display.backlight.lock);
463}
464
465static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,
466 const struct drm_connector_state *conn_state, u32 level)
467{
468 struct intel_connector *connector = to_intel_connector(conn_state->connector);
469 struct drm_i915_private *i915 = to_i915(connector->base.dev);
470 struct intel_panel *panel = &connector->panel;
471 u32 pch_ctl1, pch_ctl2;
472
473 pch_ctl1 = intel_de_read(i915, BLC_PWM_PCH_CTL1);
474 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
475 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] PCH backlight already enabled\n",
476 connector->base.base.id, connector->base.name);
477 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
478 intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1);
479 }
480
481 if (HAS_PCH_LPT(i915))
482 intel_de_rmw(i915, SOUTH_CHICKEN2, LPT_PWM_GRANULARITY,
483 panel->backlight.alternate_pwm_increment ?
484 LPT_PWM_GRANULARITY : 0);
485 else
486 intel_de_rmw(i915, SOUTH_CHICKEN1, SPT_PWM_GRANULARITY,
487 panel->backlight.alternate_pwm_increment ?
488 SPT_PWM_GRANULARITY : 0);
489
490 pch_ctl2 = panel->backlight.pwm_level_max << 16;
491 intel_de_write(i915, BLC_PWM_PCH_CTL2, pch_ctl2);
492
493 pch_ctl1 = 0;
494 if (panel->backlight.active_low_pwm)
495 pch_ctl1 |= BLM_PCH_POLARITY;
496
497 /* After LPT, override is the default. */
498 if (HAS_PCH_LPT(i915))
499 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
500
501 intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1);
502 intel_de_posting_read(i915, BLC_PWM_PCH_CTL1);
503 intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
504
505 /* This won't stick until the above enable. */
506 intel_backlight_set_pwm_level(conn_state, level);
507}
508
509static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
510 const struct drm_connector_state *conn_state, u32 level)
511{
512 struct intel_connector *connector = to_intel_connector(conn_state->connector);
513 struct drm_i915_private *i915 = to_i915(connector->base.dev);
514 struct intel_panel *panel = &connector->panel;
515 enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
516 u32 cpu_ctl2, pch_ctl1, pch_ctl2;
517
518 cpu_ctl2 = intel_de_read(i915, BLC_PWM_CPU_CTL2);
519 if (cpu_ctl2 & BLM_PWM_ENABLE) {
520 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] CPU backlight already enabled\n",
521 connector->base.base.id, connector->base.name);
522 cpu_ctl2 &= ~BLM_PWM_ENABLE;
523 intel_de_write(i915, BLC_PWM_CPU_CTL2, cpu_ctl2);
524 }
525
526 pch_ctl1 = intel_de_read(i915, BLC_PWM_PCH_CTL1);
527 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
528 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] PCH backlight already enabled\n",
529 connector->base.base.id, connector->base.name);
530 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
531 intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1);
532 }
533
534 if (cpu_transcoder == TRANSCODER_EDP)
535 cpu_ctl2 = BLM_TRANSCODER_EDP;
536 else
537 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
538 intel_de_write(i915, BLC_PWM_CPU_CTL2, cpu_ctl2);
539 intel_de_posting_read(i915, BLC_PWM_CPU_CTL2);
540 intel_de_write(i915, BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
541
542 /* This won't stick until the above enable. */
543 intel_backlight_set_pwm_level(conn_state, level);
544
545 pch_ctl2 = panel->backlight.pwm_level_max << 16;
546 intel_de_write(i915, BLC_PWM_PCH_CTL2, pch_ctl2);
547
548 pch_ctl1 = 0;
549 if (panel->backlight.active_low_pwm)
550 pch_ctl1 |= BLM_PCH_POLARITY;
551
552 intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1);
553 intel_de_posting_read(i915, BLC_PWM_PCH_CTL1);
554 intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
555}
556
557static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
558 const struct drm_connector_state *conn_state, u32 level)
559{
560 struct intel_connector *connector = to_intel_connector(conn_state->connector);
561 struct drm_i915_private *i915 = to_i915(connector->base.dev);
562 struct intel_panel *panel = &connector->panel;
563 u32 ctl, freq;
564
565 ctl = intel_de_read(i915, BLC_PWM_CTL);
566 if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
567 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] backlight already enabled\n",
568 connector->base.base.id, connector->base.name);
569 intel_de_write(i915, BLC_PWM_CTL, 0);
570 }
571
572 freq = panel->backlight.pwm_level_max;
573 if (panel->backlight.combination_mode)
574 freq /= 0xff;
575
576 ctl = freq << 17;
577 if (panel->backlight.combination_mode)
578 ctl |= BLM_LEGACY_MODE;
579 if (IS_PINEVIEW(i915) && panel->backlight.active_low_pwm)
580 ctl |= BLM_POLARITY_PNV;
581
582 intel_de_write(i915, BLC_PWM_CTL, ctl);
583 intel_de_posting_read(i915, BLC_PWM_CTL);
584
585 /* XXX: combine this into above write? */
586 intel_backlight_set_pwm_level(conn_state, level);
587
588 /*
589 * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
590 * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
591 * that has backlight.
592 */
593 if (DISPLAY_VER(i915) == 2)
594 intel_de_write(i915, BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
595}
596
597static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,
598 const struct drm_connector_state *conn_state, u32 level)
599{
600 struct intel_connector *connector = to_intel_connector(conn_state->connector);
601 struct drm_i915_private *i915 = to_i915(connector->base.dev);
602 struct intel_panel *panel = &connector->panel;
603 enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
604 u32 ctl, ctl2, freq;
605
606 ctl2 = intel_de_read(i915, BLC_PWM_CTL2);
607 if (ctl2 & BLM_PWM_ENABLE) {
608 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] backlight already enabled\n",
609 connector->base.base.id, connector->base.name);
610 ctl2 &= ~BLM_PWM_ENABLE;
611 intel_de_write(i915, BLC_PWM_CTL2, ctl2);
612 }
613
614 freq = panel->backlight.pwm_level_max;
615 if (panel->backlight.combination_mode)
616 freq /= 0xff;
617
618 ctl = freq << 16;
619 intel_de_write(i915, BLC_PWM_CTL, ctl);
620
621 ctl2 = BLM_PIPE(pipe);
622 if (panel->backlight.combination_mode)
623 ctl2 |= BLM_COMBINATION_MODE;
624 if (panel->backlight.active_low_pwm)
625 ctl2 |= BLM_POLARITY_I965;
626 intel_de_write(i915, BLC_PWM_CTL2, ctl2);
627 intel_de_posting_read(i915, BLC_PWM_CTL2);
628 intel_de_write(i915, BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
629
630 intel_backlight_set_pwm_level(conn_state, level);
631}
632
633static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
634 const struct drm_connector_state *conn_state, u32 level)
635{
636 struct intel_connector *connector = to_intel_connector(conn_state->connector);
637 struct drm_i915_private *i915 = to_i915(connector->base.dev);
638 struct intel_panel *panel = &connector->panel;
639 enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
640 u32 ctl, ctl2;
641
642 ctl2 = intel_de_read(i915, VLV_BLC_PWM_CTL2(pipe));
643 if (ctl2 & BLM_PWM_ENABLE) {
644 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] backlight already enabled\n",
645 connector->base.base.id, connector->base.name);
646 ctl2 &= ~BLM_PWM_ENABLE;
647 intel_de_write(i915, VLV_BLC_PWM_CTL2(pipe), ctl2);
648 }
649
650 ctl = panel->backlight.pwm_level_max << 16;
651 intel_de_write(i915, VLV_BLC_PWM_CTL(pipe), ctl);
652
653 /* XXX: combine this into above write? */
654 intel_backlight_set_pwm_level(conn_state, level);
655
656 ctl2 = 0;
657 if (panel->backlight.active_low_pwm)
658 ctl2 |= BLM_POLARITY_I965;
659 intel_de_write(i915, VLV_BLC_PWM_CTL2(pipe), ctl2);
660 intel_de_posting_read(i915, VLV_BLC_PWM_CTL2(pipe));
661 intel_de_write(i915, VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
662}
663
664static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,
665 const struct drm_connector_state *conn_state, u32 level)
666{
667 struct intel_connector *connector = to_intel_connector(conn_state->connector);
668 struct drm_i915_private *i915 = to_i915(connector->base.dev);
669 struct intel_panel *panel = &connector->panel;
670 enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
671 u32 pwm_ctl, val;
672
673 /* Controller 1 uses the utility pin. */
674 if (panel->backlight.controller == 1) {
675 val = intel_de_read(i915, UTIL_PIN_CTL);
676 if (val & UTIL_PIN_ENABLE) {
677 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] utility pin already enabled\n",
678 connector->base.base.id, connector->base.name);
679 val &= ~UTIL_PIN_ENABLE;
680 intel_de_write(i915, UTIL_PIN_CTL, val);
681 }
682
683 val = 0;
684 if (panel->backlight.util_pin_active_low)
685 val |= UTIL_PIN_POLARITY;
686 intel_de_write(i915, UTIL_PIN_CTL,
687 val | UTIL_PIN_PIPE(pipe) | UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
688 }
689
690 pwm_ctl = intel_de_read(i915, BXT_BLC_PWM_CTL(panel->backlight.controller));
691 if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
692 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] backlight already enabled\n",
693 connector->base.base.id, connector->base.name);
694 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
695 intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
696 pwm_ctl);
697 }
698
699 intel_de_write(i915, BXT_BLC_PWM_FREQ(panel->backlight.controller),
700 panel->backlight.pwm_level_max);
701
702 intel_backlight_set_pwm_level(conn_state, level);
703
704 pwm_ctl = 0;
705 if (panel->backlight.active_low_pwm)
706 pwm_ctl |= BXT_BLC_PWM_POLARITY;
707
708 intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
709 intel_de_posting_read(i915, BXT_BLC_PWM_CTL(panel->backlight.controller));
710 intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
711 pwm_ctl | BXT_BLC_PWM_ENABLE);
712}
713
714static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,
715 const struct drm_connector_state *conn_state, u32 level)
716{
717 struct intel_connector *connector = to_intel_connector(conn_state->connector);
718 struct drm_i915_private *i915 = to_i915(connector->base.dev);
719 struct intel_panel *panel = &connector->panel;
720 u32 pwm_ctl;
721
722 pwm_ctl = intel_de_read(i915, BXT_BLC_PWM_CTL(panel->backlight.controller));
723 if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
724 drm_dbg_kms(&i915->drm, "backlight already enabled\n");
725 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
726 intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
727 pwm_ctl);
728 }
729
730 intel_de_write(i915, BXT_BLC_PWM_FREQ(panel->backlight.controller),
731 panel->backlight.pwm_level_max);
732
733 intel_backlight_set_pwm_level(conn_state, level);
734
735 pwm_ctl = 0;
736 if (panel->backlight.active_low_pwm)
737 pwm_ctl |= BXT_BLC_PWM_POLARITY;
738
739 intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
740 intel_de_posting_read(i915, BXT_BLC_PWM_CTL(panel->backlight.controller));
741 intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
742 pwm_ctl | BXT_BLC_PWM_ENABLE);
743}
744
745static void ext_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
746 const struct drm_connector_state *conn_state, u32 level)
747{
748 struct intel_connector *connector = to_intel_connector(conn_state->connector);
749 struct intel_panel *panel = &connector->panel;
750
751 pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
752 panel->backlight.pwm_state.enabled = true;
753 pwm_apply_might_sleep(panel->backlight.pwm, &panel->backlight.pwm_state);
754}
755
756static void __intel_backlight_enable(const struct intel_crtc_state *crtc_state,
757 const struct drm_connector_state *conn_state)
758{
759 struct intel_connector *connector = to_intel_connector(conn_state->connector);
760 struct intel_panel *panel = &connector->panel;
761
762 WARN_ON(panel->backlight.max == 0);
763
764 if (panel->backlight.level < panel->backlight.min) {
765 panel->backlight.level = panel->backlight.min;
766 if (panel->backlight.device)
767 panel->backlight.device->props.brightness =
768 scale_hw_to_user(connector,
769 panel->backlight.level,
770 panel->backlight.device->props.max_brightness);
771 }
772
773 panel->backlight.funcs->enable(crtc_state, conn_state, panel->backlight.level);
774 panel->backlight.enabled = true;
775 if (panel->backlight.device)
776 panel->backlight.device->props.power = BACKLIGHT_POWER_ON;
777}
778
779void intel_backlight_enable(const struct intel_crtc_state *crtc_state,
780 const struct drm_connector_state *conn_state)
781{
782 struct intel_connector *connector = to_intel_connector(conn_state->connector);
783 struct drm_i915_private *i915 = to_i915(connector->base.dev);
784 struct intel_panel *panel = &connector->panel;
785 enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
786
787 if (!panel->backlight.present)
788 return;
789
790 drm_dbg_kms(&i915->drm, "pipe %c\n", pipe_name(pipe));
791
792 mutex_lock(&i915->display.backlight.lock);
793
794 __intel_backlight_enable(crtc_state, conn_state);
795
796 mutex_unlock(&i915->display.backlight.lock);
797}
798
799#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
800static u32 intel_panel_get_backlight(struct intel_connector *connector)
801{
802 struct drm_i915_private *i915 = to_i915(connector->base.dev);
803 struct intel_panel *panel = &connector->panel;
804 u32 val = 0;
805
806 mutex_lock(&i915->display.backlight.lock);
807
808 if (panel->backlight.enabled)
809 val = panel->backlight.funcs->get(connector, intel_connector_get_pipe(connector));
810
811 mutex_unlock(&i915->display.backlight.lock);
812
813 drm_dbg_kms(&i915->drm, "get backlight PWM = %d\n", val);
814 return val;
815}
816
817/* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
818static u32 scale_user_to_hw(struct intel_connector *connector,
819 u32 user_level, u32 user_max)
820{
821 struct intel_panel *panel = &connector->panel;
822
823 return scale(user_level, 0, user_max,
824 panel->backlight.min, panel->backlight.max);
825}
826
827/* set backlight brightness to level in range [0..max], scaling wrt hw min */
828static void intel_panel_set_backlight(const struct drm_connector_state *conn_state,
829 u32 user_level, u32 user_max)
830{
831 struct intel_connector *connector = to_intel_connector(conn_state->connector);
832 struct drm_i915_private *i915 = to_i915(connector->base.dev);
833 struct intel_panel *panel = &connector->panel;
834 u32 hw_level;
835
836 if (!panel->backlight.present)
837 return;
838
839 mutex_lock(&i915->display.backlight.lock);
840
841 drm_WARN_ON(&i915->drm, panel->backlight.max == 0);
842
843 hw_level = scale_user_to_hw(connector, user_level, user_max);
844 panel->backlight.level = hw_level;
845
846 if (panel->backlight.enabled)
847 intel_panel_actually_set_backlight(conn_state, hw_level);
848
849 mutex_unlock(&i915->display.backlight.lock);
850}
851
852static int intel_backlight_device_update_status(struct backlight_device *bd)
853{
854 struct intel_connector *connector = bl_get_data(bd);
855 struct drm_i915_private *i915 = to_i915(connector->base.dev);
856 struct intel_panel *panel = &connector->panel;
857
858 drm_modeset_lock(&i915->drm.mode_config.connection_mutex, NULL);
859
860 drm_dbg_kms(&i915->drm, "updating intel_backlight, brightness=%d/%d\n",
861 bd->props.brightness, bd->props.max_brightness);
862 intel_panel_set_backlight(connector->base.state, bd->props.brightness,
863 bd->props.max_brightness);
864
865 /*
866 * Allow flipping bl_power as a sub-state of enabled. Sadly the
867 * backlight class device does not make it easy to differentiate
868 * between callbacks for brightness and bl_power, so our backlight_power
869 * callback needs to take this into account.
870 */
871 if (panel->backlight.enabled) {
872 if (panel->backlight.power) {
873 bool enable = bd->props.power == BACKLIGHT_POWER_ON &&
874 bd->props.brightness != 0;
875 panel->backlight.power(connector, enable);
876 }
877 } else {
878 bd->props.power = BACKLIGHT_POWER_OFF;
879 }
880
881 drm_modeset_unlock(&i915->drm.mode_config.connection_mutex);
882
883 return 0;
884}
885
886static int intel_backlight_device_get_brightness(struct backlight_device *bd)
887{
888 struct intel_connector *connector = bl_get_data(bd);
889 struct drm_i915_private *i915 = to_i915(connector->base.dev);
890 intel_wakeref_t wakeref;
891 int ret = 0;
892
893 with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
894 u32 hw_level;
895
896 drm_modeset_lock(&i915->drm.mode_config.connection_mutex, NULL);
897
898 hw_level = intel_panel_get_backlight(connector);
899 ret = scale_hw_to_user(connector,
900 hw_level, bd->props.max_brightness);
901
902 drm_modeset_unlock(&i915->drm.mode_config.connection_mutex);
903 }
904
905 return ret;
906}
907
908static const struct backlight_ops intel_backlight_device_ops = {
909 .update_status = intel_backlight_device_update_status,
910 .get_brightness = intel_backlight_device_get_brightness,
911};
912
913int intel_backlight_device_register(struct intel_connector *connector)
914{
915 struct drm_i915_private *i915 = to_i915(connector->base.dev);
916 struct intel_panel *panel = &connector->panel;
917 struct backlight_properties props;
918 struct backlight_device *bd;
919 const char *name;
920 int ret = 0;
921
922 if (WARN_ON(panel->backlight.device))
923 return -ENODEV;
924
925 if (!panel->backlight.present)
926 return 0;
927
928 WARN_ON(panel->backlight.max == 0);
929
930 if (!acpi_video_backlight_use_native()) {
931 drm_info(&i915->drm, "Skipping intel_backlight registration\n");
932 return 0;
933 }
934
935 memset(&props, 0, sizeof(props));
936 props.type = BACKLIGHT_RAW;
937
938 /*
939 * Note: Everything should work even if the backlight device max
940 * presented to the userspace is arbitrarily chosen.
941 */
942 props.max_brightness = panel->backlight.max;
943 props.brightness = scale_hw_to_user(connector,
944 panel->backlight.level,
945 props.max_brightness);
946
947 if (panel->backlight.enabled)
948 props.power = BACKLIGHT_POWER_ON;
949 else
950 props.power = BACKLIGHT_POWER_OFF;
951
952 name = kstrdup("intel_backlight", GFP_KERNEL);
953 if (!name)
954 return -ENOMEM;
955
956 bd = backlight_device_get_by_name(name);
957 if (bd) {
958 put_device(&bd->dev);
959 /*
960 * Using the same name independent of the drm device or connector
961 * prevents registration of multiple backlight devices in the
962 * driver. However, we need to use the default name for backward
963 * compatibility. Use unique names for subsequent backlight devices as a
964 * fallback when the default name already exists.
965 */
966 kfree(name);
967 name = kasprintf(GFP_KERNEL, "card%d-%s-backlight",
968 i915->drm.primary->index, connector->base.name);
969 if (!name)
970 return -ENOMEM;
971 }
972 bd = backlight_device_register(name, connector->base.kdev, connector,
973 &intel_backlight_device_ops, &props);
974
975 if (IS_ERR(bd)) {
976 drm_err(&i915->drm,
977 "[CONNECTOR:%d:%s] backlight device %s register failed: %ld\n",
978 connector->base.base.id, connector->base.name, name, PTR_ERR(bd));
979 ret = PTR_ERR(bd);
980 goto out;
981 }
982
983 panel->backlight.device = bd;
984
985 drm_dbg_kms(&i915->drm,
986 "[CONNECTOR:%d:%s] backlight device %s registered\n",
987 connector->base.base.id, connector->base.name, name);
988
989out:
990 kfree(name);
991
992 return ret;
993}
994
995void intel_backlight_device_unregister(struct intel_connector *connector)
996{
997 struct intel_panel *panel = &connector->panel;
998
999 if (panel->backlight.device) {
1000 backlight_device_unregister(panel->backlight.device);
1001 panel->backlight.device = NULL;
1002 }
1003}
1004#endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1005
1006/*
1007 * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
1008 * PWM increment = 1
1009 */
1010static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1011{
1012 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1013
1014 return DIV_ROUND_CLOSEST(KHz(DISPLAY_RUNTIME_INFO(i915)->rawclk_freq),
1015 pwm_freq_hz);
1016}
1017
1018/*
1019 * BXT: PWM clock frequency = 19.2 MHz.
1020 */
1021static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1022{
1023 return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz);
1024}
1025
1026/*
1027 * SPT: This value represents the period of the PWM stream in clock periods
1028 * multiplied by 16 (default increment) or 128 (alternate increment selected in
1029 * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1030 */
1031static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1032{
1033 struct intel_panel *panel = &connector->panel;
1034 u32 mul;
1035
1036 if (panel->backlight.alternate_pwm_increment)
1037 mul = 128;
1038 else
1039 mul = 16;
1040
1041 return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz * mul);
1042}
1043
1044/*
1045 * LPT: This value represents the period of the PWM stream in clock periods
1046 * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1047 * LPT SOUTH_CHICKEN2 register bit 5).
1048 */
1049static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1050{
1051 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1052 struct intel_panel *panel = &connector->panel;
1053 u32 mul, clock;
1054
1055 if (panel->backlight.alternate_pwm_increment)
1056 mul = 16;
1057 else
1058 mul = 128;
1059
1060 if (HAS_PCH_LPT_H(i915))
1061 clock = MHz(135); /* LPT:H */
1062 else
1063 clock = MHz(24); /* LPT:LP */
1064
1065 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1066}
1067
1068/*
1069 * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1070 * display raw clocks multiplied by 128.
1071 */
1072static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1073{
1074 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1075
1076 return DIV_ROUND_CLOSEST(KHz(DISPLAY_RUNTIME_INFO(i915)->rawclk_freq),
1077 pwm_freq_hz * 128);
1078}
1079
1080/*
1081 * Gen2: This field determines the number of time base events (display core
1082 * clock frequency/32) in total for a complete cycle of modulated backlight
1083 * control.
1084 *
1085 * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1086 * divided by 32.
1087 */
1088static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1089{
1090 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1091 int clock;
1092
1093 if (IS_PINEVIEW(i915))
1094 clock = KHz(DISPLAY_RUNTIME_INFO(i915)->rawclk_freq);
1095 else
1096 clock = KHz(i915->display.cdclk.hw.cdclk);
1097
1098 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 32);
1099}
1100
1101/*
1102 * Gen4: This value represents the period of the PWM stream in display core
1103 * clocks ([DevCTG] HRAW clocks) multiplied by 128.
1104 *
1105 */
1106static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1107{
1108 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1109 int clock;
1110
1111 if (IS_G4X(i915))
1112 clock = KHz(DISPLAY_RUNTIME_INFO(i915)->rawclk_freq);
1113 else
1114 clock = KHz(i915->display.cdclk.hw.cdclk);
1115
1116 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 128);
1117}
1118
1119/*
1120 * VLV: This value represents the period of the PWM stream in display core
1121 * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1122 * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1123 */
1124static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1125{
1126 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1127 int mul, clock;
1128
1129 if ((intel_de_read(i915, CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
1130 if (IS_CHERRYVIEW(i915))
1131 clock = KHz(19200);
1132 else
1133 clock = MHz(25);
1134 mul = 16;
1135 } else {
1136 clock = KHz(DISPLAY_RUNTIME_INFO(i915)->rawclk_freq);
1137 mul = 128;
1138 }
1139
1140 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1141}
1142
1143static u16 get_vbt_pwm_freq(struct intel_connector *connector)
1144{
1145 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1146 u16 pwm_freq_hz = connector->panel.vbt.backlight.pwm_freq_hz;
1147
1148 if (pwm_freq_hz) {
1149 drm_dbg_kms(&i915->drm,
1150 "VBT defined backlight frequency %u Hz\n",
1151 pwm_freq_hz);
1152 } else {
1153 pwm_freq_hz = 200;
1154 drm_dbg_kms(&i915->drm,
1155 "default backlight frequency %u Hz\n",
1156 pwm_freq_hz);
1157 }
1158
1159 return pwm_freq_hz;
1160}
1161
1162static u32 get_backlight_max_vbt(struct intel_connector *connector)
1163{
1164 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1165 struct intel_panel *panel = &connector->panel;
1166 u16 pwm_freq_hz = get_vbt_pwm_freq(connector);
1167 u32 pwm;
1168
1169 if (!panel->backlight.pwm_funcs->hz_to_pwm) {
1170 drm_dbg_kms(&i915->drm,
1171 "backlight frequency conversion not supported\n");
1172 return 0;
1173 }
1174
1175 pwm = panel->backlight.pwm_funcs->hz_to_pwm(connector, pwm_freq_hz);
1176 if (!pwm) {
1177 drm_dbg_kms(&i915->drm,
1178 "backlight frequency conversion failed\n");
1179 return 0;
1180 }
1181
1182 return pwm;
1183}
1184
1185/*
1186 * Note: The setup hooks can't assume pipe is set!
1187 */
1188static u32 get_backlight_min_vbt(struct intel_connector *connector)
1189{
1190 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1191 struct intel_panel *panel = &connector->panel;
1192 int min;
1193
1194 drm_WARN_ON(&i915->drm, panel->backlight.pwm_level_max == 0);
1195
1196 /*
1197 * XXX: If the vbt value is 255, it makes min equal to max, which leads
1198 * to problems. There are such machines out there. Either our
1199 * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1200 * against this by letting the minimum be at most (arbitrarily chosen)
1201 * 25% of the max.
1202 */
1203 min = clamp_t(int, connector->panel.vbt.backlight.min_brightness, 0, 64);
1204 if (min != connector->panel.vbt.backlight.min_brightness) {
1205 drm_dbg_kms(&i915->drm,
1206 "clamping VBT min backlight %d/255 to %d/255\n",
1207 connector->panel.vbt.backlight.min_brightness, min);
1208 }
1209
1210 /* vbt value is a coefficient in range [0..255] */
1211 return scale(min, 0, 255, 0, panel->backlight.pwm_level_max);
1212}
1213
1214static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1215{
1216 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1217 struct intel_panel *panel = &connector->panel;
1218 u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1219 bool alt, cpu_mode;
1220
1221 if (HAS_PCH_LPT(i915))
1222 alt = intel_de_read(i915, SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY;
1223 else
1224 alt = intel_de_read(i915, SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;
1225 panel->backlight.alternate_pwm_increment = alt;
1226
1227 pch_ctl1 = intel_de_read(i915, BLC_PWM_PCH_CTL1);
1228 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1229
1230 pch_ctl2 = intel_de_read(i915, BLC_PWM_PCH_CTL2);
1231 panel->backlight.pwm_level_max = pch_ctl2 >> 16;
1232
1233 cpu_ctl2 = intel_de_read(i915, BLC_PWM_CPU_CTL2);
1234
1235 if (!panel->backlight.pwm_level_max)
1236 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1237
1238 if (!panel->backlight.pwm_level_max)
1239 return -ENODEV;
1240
1241 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1242
1243 panel->backlight.pwm_enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;
1244
1245 cpu_mode = panel->backlight.pwm_enabled && HAS_PCH_LPT(i915) &&
1246 !(pch_ctl1 & BLM_PCH_OVERRIDE_ENABLE) &&
1247 (cpu_ctl2 & BLM_PWM_ENABLE);
1248
1249 if (cpu_mode) {
1250 val = pch_get_backlight(connector, unused);
1251
1252 drm_dbg_kms(&i915->drm,
1253 "CPU backlight register was enabled, switching to PCH override\n");
1254
1255 /* Write converted CPU PWM value to PCH override register */
1256 lpt_set_backlight(connector->base.state, val);
1257 intel_de_write(i915, BLC_PWM_PCH_CTL1,
1258 pch_ctl1 | BLM_PCH_OVERRIDE_ENABLE);
1259
1260 intel_de_write(i915, BLC_PWM_CPU_CTL2,
1261 cpu_ctl2 & ~BLM_PWM_ENABLE);
1262 }
1263
1264 drm_dbg_kms(&i915->drm,
1265 "[CONNECTOR:%d:%s] Using native PCH PWM for backlight control\n",
1266 connector->base.base.id, connector->base.name);
1267
1268 return 0;
1269}
1270
1271static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
1272{
1273 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1274 struct intel_panel *panel = &connector->panel;
1275 u32 cpu_ctl2, pch_ctl1, pch_ctl2;
1276
1277 pch_ctl1 = intel_de_read(i915, BLC_PWM_PCH_CTL1);
1278 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1279
1280 pch_ctl2 = intel_de_read(i915, BLC_PWM_PCH_CTL2);
1281 panel->backlight.pwm_level_max = pch_ctl2 >> 16;
1282
1283 if (!panel->backlight.pwm_level_max)
1284 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1285
1286 if (!panel->backlight.pwm_level_max)
1287 return -ENODEV;
1288
1289 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1290
1291 cpu_ctl2 = intel_de_read(i915, BLC_PWM_CPU_CTL2);
1292 panel->backlight.pwm_enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1293 (pch_ctl1 & BLM_PCH_PWM_ENABLE);
1294
1295 drm_dbg_kms(&i915->drm,
1296 "[CONNECTOR:%d:%s] Using native PCH PWM for backlight control\n",
1297 connector->base.base.id, connector->base.name);
1298
1299 return 0;
1300}
1301
1302static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
1303{
1304 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1305 struct intel_panel *panel = &connector->panel;
1306 u32 ctl, val;
1307
1308 ctl = intel_de_read(i915, BLC_PWM_CTL);
1309
1310 if (DISPLAY_VER(i915) == 2 || IS_I915GM(i915) || IS_I945GM(i915))
1311 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1312
1313 if (IS_PINEVIEW(i915))
1314 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1315
1316 panel->backlight.pwm_level_max = ctl >> 17;
1317
1318 if (!panel->backlight.pwm_level_max) {
1319 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1320 panel->backlight.pwm_level_max >>= 1;
1321 }
1322
1323 if (!panel->backlight.pwm_level_max)
1324 return -ENODEV;
1325
1326 if (panel->backlight.combination_mode)
1327 panel->backlight.pwm_level_max *= 0xff;
1328
1329 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1330
1331 val = i9xx_get_backlight(connector, unused);
1332 val = intel_backlight_invert_pwm_level(connector, val);
1333 val = clamp(val, panel->backlight.pwm_level_min, panel->backlight.pwm_level_max);
1334
1335 panel->backlight.pwm_enabled = val != 0;
1336
1337 drm_dbg_kms(&i915->drm,
1338 "[CONNECTOR:%d:%s] Using native PWM for backlight control\n",
1339 connector->base.base.id, connector->base.name);
1340
1341 return 0;
1342}
1343
1344static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
1345{
1346 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1347 struct intel_panel *panel = &connector->panel;
1348 u32 ctl, ctl2;
1349
1350 ctl2 = intel_de_read(i915, BLC_PWM_CTL2);
1351 panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1352 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1353
1354 ctl = intel_de_read(i915, BLC_PWM_CTL);
1355 panel->backlight.pwm_level_max = ctl >> 16;
1356
1357 if (!panel->backlight.pwm_level_max)
1358 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1359
1360 if (!panel->backlight.pwm_level_max)
1361 return -ENODEV;
1362
1363 if (panel->backlight.combination_mode)
1364 panel->backlight.pwm_level_max *= 0xff;
1365
1366 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1367
1368 panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE;
1369
1370 drm_dbg_kms(&i915->drm,
1371 "[CONNECTOR:%d:%s] Using native PWM for backlight control\n",
1372 connector->base.base.id, connector->base.name);
1373
1374 return 0;
1375}
1376
1377static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1378{
1379 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1380 struct intel_panel *panel = &connector->panel;
1381 u32 ctl, ctl2;
1382
1383 if (drm_WARN_ON(&i915->drm, pipe != PIPE_A && pipe != PIPE_B))
1384 return -ENODEV;
1385
1386 ctl2 = intel_de_read(i915, VLV_BLC_PWM_CTL2(pipe));
1387 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1388
1389 ctl = intel_de_read(i915, VLV_BLC_PWM_CTL(pipe));
1390 panel->backlight.pwm_level_max = ctl >> 16;
1391
1392 if (!panel->backlight.pwm_level_max)
1393 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1394
1395 if (!panel->backlight.pwm_level_max)
1396 return -ENODEV;
1397
1398 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1399
1400 panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE;
1401
1402 drm_dbg_kms(&i915->drm,
1403 "[CONNECTOR:%d:%s] Using native PWM for backlight control (on pipe %c)\n",
1404 connector->base.base.id, connector->base.name, pipe_name(pipe));
1405
1406 return 0;
1407}
1408
1409static int
1410bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1411{
1412 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1413 struct intel_panel *panel = &connector->panel;
1414 u32 pwm_ctl, val;
1415
1416 panel->backlight.controller = connector->panel.vbt.backlight.controller;
1417
1418 pwm_ctl = intel_de_read(i915,
1419 BXT_BLC_PWM_CTL(panel->backlight.controller));
1420
1421 /* Controller 1 uses the utility pin. */
1422 if (panel->backlight.controller == 1) {
1423 val = intel_de_read(i915, UTIL_PIN_CTL);
1424 panel->backlight.util_pin_active_low =
1425 val & UTIL_PIN_POLARITY;
1426 }
1427
1428 panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1429 panel->backlight.pwm_level_max =
1430 intel_de_read(i915, BXT_BLC_PWM_FREQ(panel->backlight.controller));
1431
1432 if (!panel->backlight.pwm_level_max)
1433 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1434
1435 if (!panel->backlight.pwm_level_max)
1436 return -ENODEV;
1437
1438 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1439
1440 panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1441
1442 drm_dbg_kms(&i915->drm,
1443 "[CONNECTOR:%d:%s] Using native PWM for backlight control (controller=%d)\n",
1444 connector->base.base.id, connector->base.name,
1445 panel->backlight.controller);
1446
1447 return 0;
1448}
1449
1450static int cnp_num_backlight_controllers(struct drm_i915_private *i915)
1451{
1452 if (INTEL_PCH_TYPE(i915) >= PCH_MTL)
1453 return 2;
1454
1455 if (INTEL_PCH_TYPE(i915) >= PCH_DG1)
1456 return 1;
1457
1458 if (INTEL_PCH_TYPE(i915) >= PCH_ICP)
1459 return 2;
1460
1461 return 1;
1462}
1463
1464static bool cnp_backlight_controller_is_valid(struct drm_i915_private *i915, int controller)
1465{
1466 if (controller < 0 || controller >= cnp_num_backlight_controllers(i915))
1467 return false;
1468
1469 if (controller == 1 &&
1470 INTEL_PCH_TYPE(i915) >= PCH_ICP &&
1471 INTEL_PCH_TYPE(i915) <= PCH_ADP)
1472 return intel_de_read(i915, SOUTH_CHICKEN1) & ICP_SECOND_PPS_IO_SELECT;
1473
1474 return true;
1475}
1476
1477static int
1478cnp_setup_backlight(struct intel_connector *connector, enum pipe unused)
1479{
1480 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1481 struct intel_panel *panel = &connector->panel;
1482 u32 pwm_ctl;
1483
1484 /*
1485 * CNP has the BXT implementation of backlight, but with only one
1486 * controller. ICP+ can have two controllers, depending on pin muxing.
1487 */
1488 panel->backlight.controller = connector->panel.vbt.backlight.controller;
1489 if (!cnp_backlight_controller_is_valid(i915, panel->backlight.controller)) {
1490 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] Invalid backlight controller %d, assuming 0\n",
1491 connector->base.base.id, connector->base.name,
1492 panel->backlight.controller);
1493 panel->backlight.controller = 0;
1494 }
1495
1496 pwm_ctl = intel_de_read(i915,
1497 BXT_BLC_PWM_CTL(panel->backlight.controller));
1498
1499 panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1500 panel->backlight.pwm_level_max =
1501 intel_de_read(i915, BXT_BLC_PWM_FREQ(panel->backlight.controller));
1502
1503 if (!panel->backlight.pwm_level_max)
1504 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1505
1506 if (!panel->backlight.pwm_level_max)
1507 return -ENODEV;
1508
1509 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1510
1511 panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1512
1513 drm_dbg_kms(&i915->drm,
1514 "[CONNECTOR:%d:%s] Using native PCH PWM for backlight control (controller=%d)\n",
1515 connector->base.base.id, connector->base.name,
1516 panel->backlight.controller);
1517
1518 return 0;
1519}
1520
1521static int ext_pwm_setup_backlight(struct intel_connector *connector,
1522 enum pipe pipe)
1523{
1524 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1525 struct intel_panel *panel = &connector->panel;
1526 const char *desc;
1527 u32 level;
1528
1529 /* Get the right PWM chip for DSI backlight according to VBT */
1530 if (connector->panel.vbt.dsi.config->pwm_blc == PPS_BLC_PMIC) {
1531 panel->backlight.pwm = pwm_get(i915->drm.dev, "pwm_pmic_backlight");
1532 desc = "PMIC";
1533 } else {
1534 panel->backlight.pwm = pwm_get(i915->drm.dev, "pwm_soc_backlight");
1535 desc = "SoC";
1536 }
1537
1538 if (IS_ERR(panel->backlight.pwm)) {
1539 drm_err(&i915->drm, "[CONNECTOR:%d:%s] Failed to get the %s PWM chip\n",
1540 connector->base.base.id, connector->base.name, desc);
1541 panel->backlight.pwm = NULL;
1542 return -ENODEV;
1543 }
1544
1545 panel->backlight.pwm_level_max = 100; /* 100% */
1546 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1547
1548 if (pwm_is_enabled(panel->backlight.pwm)) {
1549 /* PWM is already enabled, use existing settings */
1550 pwm_get_state(panel->backlight.pwm, &panel->backlight.pwm_state);
1551
1552 level = pwm_get_relative_duty_cycle(&panel->backlight.pwm_state,
1553 100);
1554 level = intel_backlight_invert_pwm_level(connector, level);
1555 panel->backlight.pwm_enabled = true;
1556
1557 drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] PWM already enabled at freq %ld, VBT freq %d, level %d\n",
1558 connector->base.base.id, connector->base.name,
1559 NSEC_PER_SEC / (unsigned long)panel->backlight.pwm_state.period,
1560 get_vbt_pwm_freq(connector), level);
1561 } else {
1562 /* Set period from VBT frequency, leave other settings at 0. */
1563 panel->backlight.pwm_state.period =
1564 NSEC_PER_SEC / get_vbt_pwm_freq(connector);
1565 }
1566
1567 drm_dbg_kms(&i915->drm,
1568 "[CONNECTOR:%d:%s] Using %s PWM for backlight control\n",
1569 connector->base.base.id, connector->base.name, desc);
1570
1571 return 0;
1572}
1573
1574static void intel_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
1575{
1576 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1577 struct intel_panel *panel = &connector->panel;
1578
1579 panel->backlight.pwm_funcs->set(conn_state,
1580 intel_backlight_invert_pwm_level(connector, level));
1581}
1582
1583static u32 intel_pwm_get_backlight(struct intel_connector *connector, enum pipe pipe)
1584{
1585 struct intel_panel *panel = &connector->panel;
1586
1587 return intel_backlight_invert_pwm_level(connector,
1588 panel->backlight.pwm_funcs->get(connector, pipe));
1589}
1590
1591static void intel_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
1592 const struct drm_connector_state *conn_state, u32 level)
1593{
1594 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1595 struct intel_panel *panel = &connector->panel;
1596
1597 panel->backlight.pwm_funcs->enable(crtc_state, conn_state,
1598 intel_backlight_invert_pwm_level(connector, level));
1599}
1600
1601static void intel_pwm_disable_backlight(const struct drm_connector_state *conn_state, u32 level)
1602{
1603 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1604 struct intel_panel *panel = &connector->panel;
1605
1606 panel->backlight.pwm_funcs->disable(conn_state,
1607 intel_backlight_invert_pwm_level(connector, level));
1608}
1609
1610static int intel_pwm_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1611{
1612 struct intel_panel *panel = &connector->panel;
1613 int ret;
1614
1615 ret = panel->backlight.pwm_funcs->setup(connector, pipe);
1616 if (ret < 0)
1617 return ret;
1618
1619 panel->backlight.min = panel->backlight.pwm_level_min;
1620 panel->backlight.max = panel->backlight.pwm_level_max;
1621 panel->backlight.level = intel_pwm_get_backlight(connector, pipe);
1622 panel->backlight.enabled = panel->backlight.pwm_enabled;
1623
1624 return 0;
1625}
1626
1627void intel_backlight_update(struct intel_atomic_state *state,
1628 struct intel_encoder *encoder,
1629 const struct intel_crtc_state *crtc_state,
1630 const struct drm_connector_state *conn_state)
1631{
1632 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1633 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1634 struct intel_panel *panel = &connector->panel;
1635
1636 if (!panel->backlight.present)
1637 return;
1638
1639 mutex_lock(&i915->display.backlight.lock);
1640 if (!panel->backlight.enabled)
1641 __intel_backlight_enable(crtc_state, conn_state);
1642
1643 mutex_unlock(&i915->display.backlight.lock);
1644}
1645
1646int intel_backlight_setup(struct intel_connector *connector, enum pipe pipe)
1647{
1648 struct intel_display *display = to_intel_display(connector);
1649 struct intel_panel *panel = &connector->panel;
1650 int ret;
1651
1652 if (!connector->panel.vbt.backlight.present) {
1653 if (intel_has_quirk(display, QUIRK_BACKLIGHT_PRESENT)) {
1654 drm_dbg_kms(display->drm,
1655 "[CONNECTOR:%d:%s] no backlight present per VBT, but present per quirk\n",
1656 connector->base.base.id, connector->base.name);
1657 } else {
1658 drm_dbg_kms(display->drm,
1659 "[CONNECTOR:%d:%s] no backlight present per VBT\n",
1660 connector->base.base.id, connector->base.name);
1661 return 0;
1662 }
1663 }
1664
1665 /* ensure intel_panel has been initialized first */
1666 if (drm_WARN_ON(display->drm, !panel->backlight.funcs))
1667 return -ENODEV;
1668
1669 /* set level and max in panel struct */
1670 mutex_lock(&display->backlight.lock);
1671 ret = panel->backlight.funcs->setup(connector, pipe);
1672 mutex_unlock(&display->backlight.lock);
1673
1674 if (ret) {
1675 drm_dbg_kms(display->drm,
1676 "[CONNECTOR:%d:%s] failed to setup backlight\n",
1677 connector->base.base.id, connector->base.name);
1678 return ret;
1679 }
1680
1681 panel->backlight.present = true;
1682
1683 drm_dbg_kms(display->drm,
1684 "[CONNECTOR:%d:%s] backlight initialized, %s, brightness %u/%u\n",
1685 connector->base.base.id, connector->base.name,
1686 str_enabled_disabled(panel->backlight.enabled),
1687 panel->backlight.level, panel->backlight.max);
1688
1689 return 0;
1690}
1691
1692void intel_backlight_destroy(struct intel_panel *panel)
1693{
1694 /* dispose of the pwm */
1695 if (panel->backlight.pwm)
1696 pwm_put(panel->backlight.pwm);
1697
1698 panel->backlight.present = false;
1699}
1700
1701static const struct intel_panel_bl_funcs bxt_pwm_funcs = {
1702 .setup = bxt_setup_backlight,
1703 .enable = bxt_enable_backlight,
1704 .disable = bxt_disable_backlight,
1705 .set = bxt_set_backlight,
1706 .get = bxt_get_backlight,
1707 .hz_to_pwm = bxt_hz_to_pwm,
1708};
1709
1710static const struct intel_panel_bl_funcs cnp_pwm_funcs = {
1711 .setup = cnp_setup_backlight,
1712 .enable = cnp_enable_backlight,
1713 .disable = cnp_disable_backlight,
1714 .set = bxt_set_backlight,
1715 .get = bxt_get_backlight,
1716 .hz_to_pwm = cnp_hz_to_pwm,
1717};
1718
1719static const struct intel_panel_bl_funcs lpt_pwm_funcs = {
1720 .setup = lpt_setup_backlight,
1721 .enable = lpt_enable_backlight,
1722 .disable = lpt_disable_backlight,
1723 .set = lpt_set_backlight,
1724 .get = lpt_get_backlight,
1725 .hz_to_pwm = lpt_hz_to_pwm,
1726};
1727
1728static const struct intel_panel_bl_funcs spt_pwm_funcs = {
1729 .setup = lpt_setup_backlight,
1730 .enable = lpt_enable_backlight,
1731 .disable = lpt_disable_backlight,
1732 .set = lpt_set_backlight,
1733 .get = lpt_get_backlight,
1734 .hz_to_pwm = spt_hz_to_pwm,
1735};
1736
1737static const struct intel_panel_bl_funcs pch_pwm_funcs = {
1738 .setup = pch_setup_backlight,
1739 .enable = pch_enable_backlight,
1740 .disable = pch_disable_backlight,
1741 .set = pch_set_backlight,
1742 .get = pch_get_backlight,
1743 .hz_to_pwm = pch_hz_to_pwm,
1744};
1745
1746static const struct intel_panel_bl_funcs ext_pwm_funcs = {
1747 .setup = ext_pwm_setup_backlight,
1748 .enable = ext_pwm_enable_backlight,
1749 .disable = ext_pwm_disable_backlight,
1750 .set = ext_pwm_set_backlight,
1751 .get = ext_pwm_get_backlight,
1752};
1753
1754static const struct intel_panel_bl_funcs vlv_pwm_funcs = {
1755 .setup = vlv_setup_backlight,
1756 .enable = vlv_enable_backlight,
1757 .disable = vlv_disable_backlight,
1758 .set = vlv_set_backlight,
1759 .get = vlv_get_backlight,
1760 .hz_to_pwm = vlv_hz_to_pwm,
1761};
1762
1763static const struct intel_panel_bl_funcs i965_pwm_funcs = {
1764 .setup = i965_setup_backlight,
1765 .enable = i965_enable_backlight,
1766 .disable = i965_disable_backlight,
1767 .set = i9xx_set_backlight,
1768 .get = i9xx_get_backlight,
1769 .hz_to_pwm = i965_hz_to_pwm,
1770};
1771
1772static const struct intel_panel_bl_funcs i9xx_pwm_funcs = {
1773 .setup = i9xx_setup_backlight,
1774 .enable = i9xx_enable_backlight,
1775 .disable = i9xx_disable_backlight,
1776 .set = i9xx_set_backlight,
1777 .get = i9xx_get_backlight,
1778 .hz_to_pwm = i9xx_hz_to_pwm,
1779};
1780
1781static const struct intel_panel_bl_funcs pwm_bl_funcs = {
1782 .setup = intel_pwm_setup_backlight,
1783 .enable = intel_pwm_enable_backlight,
1784 .disable = intel_pwm_disable_backlight,
1785 .set = intel_pwm_set_backlight,
1786 .get = intel_pwm_get_backlight,
1787};
1788
1789/* Set up chip specific backlight functions */
1790void intel_backlight_init_funcs(struct intel_panel *panel)
1791{
1792 struct intel_connector *connector =
1793 container_of(panel, struct intel_connector, panel);
1794 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1795
1796 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&
1797 intel_dsi_dcs_init_backlight_funcs(connector) == 0)
1798 return;
1799
1800 if (IS_GEMINILAKE(i915) || IS_BROXTON(i915)) {
1801 panel->backlight.pwm_funcs = &bxt_pwm_funcs;
1802 } else if (INTEL_PCH_TYPE(i915) >= PCH_CNP) {
1803 panel->backlight.pwm_funcs = &cnp_pwm_funcs;
1804 } else if (INTEL_PCH_TYPE(i915) >= PCH_LPT) {
1805 if (HAS_PCH_LPT(i915))
1806 panel->backlight.pwm_funcs = &lpt_pwm_funcs;
1807 else
1808 panel->backlight.pwm_funcs = &spt_pwm_funcs;
1809 } else if (HAS_PCH_SPLIT(i915)) {
1810 panel->backlight.pwm_funcs = &pch_pwm_funcs;
1811 } else if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)) {
1812 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) {
1813 panel->backlight.pwm_funcs = &ext_pwm_funcs;
1814 } else {
1815 panel->backlight.pwm_funcs = &vlv_pwm_funcs;
1816 }
1817 } else if (DISPLAY_VER(i915) == 4) {
1818 panel->backlight.pwm_funcs = &i965_pwm_funcs;
1819 } else {
1820 panel->backlight.pwm_funcs = &i9xx_pwm_funcs;
1821 }
1822
1823 if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP) {
1824 if (intel_dp_aux_init_backlight_funcs(connector) == 0)
1825 return;
1826
1827 if (!intel_has_quirk(&i915->display, QUIRK_NO_PPS_BACKLIGHT_POWER_HOOK))
1828 connector->panel.backlight.power = intel_pps_backlight_power;
1829 }
1830
1831 /* We're using a standard PWM backlight interface */
1832 panel->backlight.funcs = &pwm_bl_funcs;
1833}