1 /*
2 * Copyright © 2006-2010 Intel Corporation
3 * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
14 * Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
23 *
24 * Authors:
25 * Eric Anholt <eric@anholt.net>
26 * Dave Airlie <airlied@linux.ie>
27 * Jesse Barnes <jesse.barnes@intel.com>
28 * Chris Wilson <chris@chris-wilson.co.uk>
29 */
30
31 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
32
33 #include <linux/kernel.h>
34 #include <linux/moduleparam.h>
35 #include "intel_drv.h"
36
37 void
intel_fixed_panel_mode(const struct drm_display_mode * fixed_mode,struct drm_display_mode * adjusted_mode)38 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
39 struct drm_display_mode *adjusted_mode)
40 {
41 drm_mode_copy(adjusted_mode, fixed_mode);
42
43 drm_mode_set_crtcinfo(adjusted_mode, 0);
44 }
45
46 /**
47 * intel_find_panel_downclock - find the reduced downclock for LVDS in EDID
48 * @dev: drm device
49 * @fixed_mode : panel native mode
50 * @connector: LVDS/eDP connector
51 *
52 * Return downclock_avail
53 * Find the reduced downclock for LVDS/eDP in EDID.
54 */
55 struct drm_display_mode *
intel_find_panel_downclock(struct drm_device * dev,struct drm_display_mode * fixed_mode,struct drm_connector * connector)56 intel_find_panel_downclock(struct drm_device *dev,
57 struct drm_display_mode *fixed_mode,
58 struct drm_connector *connector)
59 {
60 struct drm_display_mode *scan, *tmp_mode;
61 int temp_downclock;
62
63 temp_downclock = fixed_mode->clock;
64 tmp_mode = NULL;
65
66 list_for_each_entry(scan, &connector->probed_modes, head) {
67 /*
68 * If one mode has the same resolution with the fixed_panel
69 * mode while they have the different refresh rate, it means
70 * that the reduced downclock is found. In such
71 * case we can set the different FPx0/1 to dynamically select
72 * between low and high frequency.
73 */
74 if (scan->hdisplay == fixed_mode->hdisplay &&
75 scan->hsync_start == fixed_mode->hsync_start &&
76 scan->hsync_end == fixed_mode->hsync_end &&
77 scan->htotal == fixed_mode->htotal &&
78 scan->vdisplay == fixed_mode->vdisplay &&
79 scan->vsync_start == fixed_mode->vsync_start &&
80 scan->vsync_end == fixed_mode->vsync_end &&
81 scan->vtotal == fixed_mode->vtotal) {
82 if (scan->clock < temp_downclock) {
83 /*
84 * The downclock is already found. But we
85 * expect to find the lower downclock.
86 */
87 temp_downclock = scan->clock;
88 tmp_mode = scan;
89 }
90 }
91 }
92
93 if (temp_downclock < fixed_mode->clock)
94 return drm_mode_duplicate(dev, tmp_mode);
95 else
96 return NULL;
97 }
98
99 /* adjusted_mode has been preset to be the panel's fixed mode */
100 void
intel_pch_panel_fitting(struct intel_crtc * intel_crtc,struct intel_crtc_state * pipe_config,int fitting_mode)101 intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
102 struct intel_crtc_state *pipe_config,
103 int fitting_mode)
104 {
105 struct drm_display_mode *adjusted_mode;
106 int x, y, width, height;
107
108 adjusted_mode = &pipe_config->base.adjusted_mode;
109
110 x = y = width = height = 0;
111
112 /* Native modes don't need fitting */
113 if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
114 adjusted_mode->vdisplay == pipe_config->pipe_src_h)
115 goto done;
116
117 switch (fitting_mode) {
118 case DRM_MODE_SCALE_CENTER:
119 width = pipe_config->pipe_src_w;
120 height = pipe_config->pipe_src_h;
121 x = (adjusted_mode->hdisplay - width + 1)/2;
122 y = (adjusted_mode->vdisplay - height + 1)/2;
123 break;
124
125 case DRM_MODE_SCALE_ASPECT:
126 /* Scale but preserve the aspect ratio */
127 {
128 u32 scaled_width = adjusted_mode->hdisplay
129 * pipe_config->pipe_src_h;
130 u32 scaled_height = pipe_config->pipe_src_w
131 * adjusted_mode->vdisplay;
132 if (scaled_width > scaled_height) { /* pillar */
133 width = scaled_height / pipe_config->pipe_src_h;
134 if (width & 1)
135 width++;
136 x = (adjusted_mode->hdisplay - width + 1) / 2;
137 y = 0;
138 height = adjusted_mode->vdisplay;
139 } else if (scaled_width < scaled_height) { /* letter */
140 height = scaled_width / pipe_config->pipe_src_w;
141 if (height & 1)
142 height++;
143 y = (adjusted_mode->vdisplay - height + 1) / 2;
144 x = 0;
145 width = adjusted_mode->hdisplay;
146 } else {
147 x = y = 0;
148 width = adjusted_mode->hdisplay;
149 height = adjusted_mode->vdisplay;
150 }
151 }
152 break;
153
154 case DRM_MODE_SCALE_FULLSCREEN:
155 x = y = 0;
156 width = adjusted_mode->hdisplay;
157 height = adjusted_mode->vdisplay;
158 break;
159
160 default:
161 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
162 return;
163 }
164
165 done:
166 pipe_config->pch_pfit.pos = (x << 16) | y;
167 pipe_config->pch_pfit.size = (width << 16) | height;
168 pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;
169 }
170
171 static void
centre_horizontally(struct drm_display_mode * mode,int width)172 centre_horizontally(struct drm_display_mode *mode,
173 int width)
174 {
175 u32 border, sync_pos, blank_width, sync_width;
176
177 /* keep the hsync and hblank widths constant */
178 sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
179 blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
180 sync_pos = (blank_width - sync_width + 1) / 2;
181
182 border = (mode->hdisplay - width + 1) / 2;
183 border += border & 1; /* make the border even */
184
185 mode->crtc_hdisplay = width;
186 mode->crtc_hblank_start = width + border;
187 mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
188
189 mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
190 mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
191 }
192
193 static void
centre_vertically(struct drm_display_mode * mode,int height)194 centre_vertically(struct drm_display_mode *mode,
195 int height)
196 {
197 u32 border, sync_pos, blank_width, sync_width;
198
199 /* keep the vsync and vblank widths constant */
200 sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
201 blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
202 sync_pos = (blank_width - sync_width + 1) / 2;
203
204 border = (mode->vdisplay - height + 1) / 2;
205
206 mode->crtc_vdisplay = height;
207 mode->crtc_vblank_start = height + border;
208 mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
209
210 mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
211 mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
212 }
213
panel_fitter_scaling(u32 source,u32 target)214 static inline u32 panel_fitter_scaling(u32 source, u32 target)
215 {
216 /*
217 * Floating point operation is not supported. So the FACTOR
218 * is defined, which can avoid the floating point computation
219 * when calculating the panel ratio.
220 */
221 #define ACCURACY 12
222 #define FACTOR (1 << ACCURACY)
223 u32 ratio = source * FACTOR / target;
224 return (FACTOR * ratio + FACTOR/2) / FACTOR;
225 }
226
i965_scale_aspect(struct intel_crtc_state * pipe_config,u32 * pfit_control)227 static void i965_scale_aspect(struct intel_crtc_state *pipe_config,
228 u32 *pfit_control)
229 {
230 struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
231 u32 scaled_width = adjusted_mode->hdisplay *
232 pipe_config->pipe_src_h;
233 u32 scaled_height = pipe_config->pipe_src_w *
234 adjusted_mode->vdisplay;
235
236 /* 965+ is easy, it does everything in hw */
237 if (scaled_width > scaled_height)
238 *pfit_control |= PFIT_ENABLE |
239 PFIT_SCALING_PILLAR;
240 else if (scaled_width < scaled_height)
241 *pfit_control |= PFIT_ENABLE |
242 PFIT_SCALING_LETTER;
243 else if (adjusted_mode->hdisplay != pipe_config->pipe_src_w)
244 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
245 }
246
i9xx_scale_aspect(struct intel_crtc_state * pipe_config,u32 * pfit_control,u32 * pfit_pgm_ratios,u32 * border)247 static void i9xx_scale_aspect(struct intel_crtc_state *pipe_config,
248 u32 *pfit_control, u32 *pfit_pgm_ratios,
249 u32 *border)
250 {
251 struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
252 u32 scaled_width = adjusted_mode->hdisplay *
253 pipe_config->pipe_src_h;
254 u32 scaled_height = pipe_config->pipe_src_w *
255 adjusted_mode->vdisplay;
256 u32 bits;
257
258 /*
259 * For earlier chips we have to calculate the scaling
260 * ratio by hand and program it into the
261 * PFIT_PGM_RATIO register
262 */
263 if (scaled_width > scaled_height) { /* pillar */
264 centre_horizontally(adjusted_mode,
265 scaled_height /
266 pipe_config->pipe_src_h);
267
268 *border = LVDS_BORDER_ENABLE;
269 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay) {
270 bits = panel_fitter_scaling(pipe_config->pipe_src_h,
271 adjusted_mode->vdisplay);
272
273 *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
274 bits << PFIT_VERT_SCALE_SHIFT);
275 *pfit_control |= (PFIT_ENABLE |
276 VERT_INTERP_BILINEAR |
277 HORIZ_INTERP_BILINEAR);
278 }
279 } else if (scaled_width < scaled_height) { /* letter */
280 centre_vertically(adjusted_mode,
281 scaled_width /
282 pipe_config->pipe_src_w);
283
284 *border = LVDS_BORDER_ENABLE;
285 if (pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
286 bits = panel_fitter_scaling(pipe_config->pipe_src_w,
287 adjusted_mode->hdisplay);
288
289 *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
290 bits << PFIT_VERT_SCALE_SHIFT);
291 *pfit_control |= (PFIT_ENABLE |
292 VERT_INTERP_BILINEAR |
293 HORIZ_INTERP_BILINEAR);
294 }
295 } else {
296 /* Aspects match, Let hw scale both directions */
297 *pfit_control |= (PFIT_ENABLE |
298 VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
299 VERT_INTERP_BILINEAR |
300 HORIZ_INTERP_BILINEAR);
301 }
302 }
303
intel_gmch_panel_fitting(struct intel_crtc * intel_crtc,struct intel_crtc_state * pipe_config,int fitting_mode)304 void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
305 struct intel_crtc_state *pipe_config,
306 int fitting_mode)
307 {
308 struct drm_device *dev = intel_crtc->base.dev;
309 u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
310 struct drm_display_mode *adjusted_mode;
311
312 adjusted_mode = &pipe_config->base.adjusted_mode;
313
314 /* Native modes don't need fitting */
315 if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
316 adjusted_mode->vdisplay == pipe_config->pipe_src_h)
317 goto out;
318
319 switch (fitting_mode) {
320 case DRM_MODE_SCALE_CENTER:
321 /*
322 * For centered modes, we have to calculate border widths &
323 * heights and modify the values programmed into the CRTC.
324 */
325 centre_horizontally(adjusted_mode, pipe_config->pipe_src_w);
326 centre_vertically(adjusted_mode, pipe_config->pipe_src_h);
327 border = LVDS_BORDER_ENABLE;
328 break;
329 case DRM_MODE_SCALE_ASPECT:
330 /* Scale but preserve the aspect ratio */
331 if (INTEL_INFO(dev)->gen >= 4)
332 i965_scale_aspect(pipe_config, &pfit_control);
333 else
334 i9xx_scale_aspect(pipe_config, &pfit_control,
335 &pfit_pgm_ratios, &border);
336 break;
337 case DRM_MODE_SCALE_FULLSCREEN:
338 /*
339 * Full scaling, even if it changes the aspect ratio.
340 * Fortunately this is all done for us in hw.
341 */
342 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay ||
343 pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
344 pfit_control |= PFIT_ENABLE;
345 if (INTEL_INFO(dev)->gen >= 4)
346 pfit_control |= PFIT_SCALING_AUTO;
347 else
348 pfit_control |= (VERT_AUTO_SCALE |
349 VERT_INTERP_BILINEAR |
350 HORIZ_AUTO_SCALE |
351 HORIZ_INTERP_BILINEAR);
352 }
353 break;
354 default:
355 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
356 return;
357 }
358
359 /* 965+ wants fuzzy fitting */
360 /* FIXME: handle multiple panels by failing gracefully */
361 if (INTEL_INFO(dev)->gen >= 4)
362 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
363 PFIT_FILTER_FUZZY);
364
365 out:
366 if ((pfit_control & PFIT_ENABLE) == 0) {
367 pfit_control = 0;
368 pfit_pgm_ratios = 0;
369 }
370
371 /* Make sure pre-965 set dither correctly for 18bpp panels. */
372 if (INTEL_INFO(dev)->gen < 4 && pipe_config->pipe_bpp == 18)
373 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
374
375 pipe_config->gmch_pfit.control = pfit_control;
376 pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
377 pipe_config->gmch_pfit.lvds_border_bits = border;
378 }
379
380 enum drm_connector_status
intel_panel_detect(struct drm_device * dev)381 intel_panel_detect(struct drm_device *dev)
382 {
383 struct drm_i915_private *dev_priv = dev->dev_private;
384
385 /* Assume that the BIOS does not lie through the OpRegion... */
386 if (!i915.panel_ignore_lid && dev_priv->opregion.lid_state) {
387 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
388 connector_status_connected :
389 connector_status_disconnected;
390 }
391
392 switch (i915.panel_ignore_lid) {
393 case -2:
394 return connector_status_connected;
395 case -1:
396 return connector_status_disconnected;
397 default:
398 return connector_status_unknown;
399 }
400 }
401
402 /**
403 * scale - scale values from one range to another
404 *
405 * @source_val: value in range [@source_min..@source_max]
406 *
407 * Return @source_val in range [@source_min..@source_max] scaled to range
408 * [@target_min..@target_max].
409 */
scale(uint32_t source_val,uint32_t source_min,uint32_t source_max,uint32_t target_min,uint32_t target_max)410 static uint32_t scale(uint32_t source_val,
411 uint32_t source_min, uint32_t source_max,
412 uint32_t target_min, uint32_t target_max)
413 {
414 uint64_t target_val;
415
416 WARN_ON(source_min > source_max);
417 WARN_ON(target_min > target_max);
418
419 /* defensive */
420 source_val = clamp(source_val, source_min, source_max);
421
422 /* avoid overflows */
423 target_val = DIV_ROUND_CLOSEST_ULL((uint64_t)(source_val - source_min) *
424 (target_max - target_min), source_max - source_min);
425 target_val += target_min;
426
427 return target_val;
428 }
429
430 /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
scale_user_to_hw(struct intel_connector * connector,u32 user_level,u32 user_max)431 static inline u32 scale_user_to_hw(struct intel_connector *connector,
432 u32 user_level, u32 user_max)
433 {
434 struct intel_panel *panel = &connector->panel;
435
436 return scale(user_level, 0, user_max,
437 panel->backlight.min, panel->backlight.max);
438 }
439
440 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
441 * to [hw_min..hw_max]. */
clamp_user_to_hw(struct intel_connector * connector,u32 user_level,u32 user_max)442 static inline u32 clamp_user_to_hw(struct intel_connector *connector,
443 u32 user_level, u32 user_max)
444 {
445 struct intel_panel *panel = &connector->panel;
446 u32 hw_level;
447
448 hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
449 hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
450
451 return hw_level;
452 }
453
454 /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
scale_hw_to_user(struct intel_connector * connector,u32 hw_level,u32 user_max)455 static inline u32 scale_hw_to_user(struct intel_connector *connector,
456 u32 hw_level, u32 user_max)
457 {
458 struct intel_panel *panel = &connector->panel;
459
460 return scale(hw_level, panel->backlight.min, panel->backlight.max,
461 0, user_max);
462 }
463
intel_panel_compute_brightness(struct intel_connector * connector,u32 val)464 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
465 u32 val)
466 {
467 struct drm_device *dev = connector->base.dev;
468 struct drm_i915_private *dev_priv = dev->dev_private;
469 struct intel_panel *panel = &connector->panel;
470
471 WARN_ON(panel->backlight.max == 0);
472
473 if (i915.invert_brightness < 0)
474 return val;
475
476 if (i915.invert_brightness > 0 ||
477 dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
478 return panel->backlight.max - val;
479 }
480
481 return val;
482 }
483
bdw_get_backlight(struct intel_connector * connector)484 static u32 bdw_get_backlight(struct intel_connector *connector)
485 {
486 struct drm_device *dev = connector->base.dev;
487 struct drm_i915_private *dev_priv = dev->dev_private;
488
489 return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
490 }
491
pch_get_backlight(struct intel_connector * connector)492 static u32 pch_get_backlight(struct intel_connector *connector)
493 {
494 struct drm_device *dev = connector->base.dev;
495 struct drm_i915_private *dev_priv = dev->dev_private;
496
497 return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
498 }
499
i9xx_get_backlight(struct intel_connector * connector)500 static u32 i9xx_get_backlight(struct intel_connector *connector)
501 {
502 struct drm_device *dev = connector->base.dev;
503 struct drm_i915_private *dev_priv = dev->dev_private;
504 struct intel_panel *panel = &connector->panel;
505 u32 val;
506
507 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
508 if (INTEL_INFO(dev)->gen < 4)
509 val >>= 1;
510
511 if (panel->backlight.combination_mode) {
512 u8 lbpc;
513
514 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
515 val *= lbpc;
516 }
517
518 return val;
519 }
520
_vlv_get_backlight(struct drm_device * dev,enum pipe pipe)521 static u32 _vlv_get_backlight(struct drm_device *dev, enum pipe pipe)
522 {
523 struct drm_i915_private *dev_priv = dev->dev_private;
524
525 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
526 return 0;
527
528 return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
529 }
530
vlv_get_backlight(struct intel_connector * connector)531 static u32 vlv_get_backlight(struct intel_connector *connector)
532 {
533 struct drm_device *dev = connector->base.dev;
534 enum pipe pipe = intel_get_pipe_from_connector(connector);
535
536 return _vlv_get_backlight(dev, pipe);
537 }
538
intel_panel_get_backlight(struct intel_connector * connector)539 static u32 intel_panel_get_backlight(struct intel_connector *connector)
540 {
541 struct drm_device *dev = connector->base.dev;
542 struct drm_i915_private *dev_priv = dev->dev_private;
543 struct intel_panel *panel = &connector->panel;
544 u32 val = 0;
545
546 mutex_lock(&dev_priv->backlight_lock);
547
548 if (panel->backlight.enabled) {
549 val = dev_priv->display.get_backlight(connector);
550 val = intel_panel_compute_brightness(connector, val);
551 }
552
553 mutex_unlock(&dev_priv->backlight_lock);
554
555 DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
556 return val;
557 }
558
bdw_set_backlight(struct intel_connector * connector,u32 level)559 static void bdw_set_backlight(struct intel_connector *connector, u32 level)
560 {
561 struct drm_device *dev = connector->base.dev;
562 struct drm_i915_private *dev_priv = dev->dev_private;
563 u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
564 I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
565 }
566
pch_set_backlight(struct intel_connector * connector,u32 level)567 static void pch_set_backlight(struct intel_connector *connector, u32 level)
568 {
569 struct drm_device *dev = connector->base.dev;
570 struct drm_i915_private *dev_priv = dev->dev_private;
571 u32 tmp;
572
573 tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
574 I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
575 }
576
i9xx_set_backlight(struct intel_connector * connector,u32 level)577 static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
578 {
579 struct drm_device *dev = connector->base.dev;
580 struct drm_i915_private *dev_priv = dev->dev_private;
581 struct intel_panel *panel = &connector->panel;
582 u32 tmp, mask;
583
584 WARN_ON(panel->backlight.max == 0);
585
586 if (panel->backlight.combination_mode) {
587 u8 lbpc;
588
589 lbpc = level * 0xfe / panel->backlight.max + 1;
590 level /= lbpc;
591 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
592 }
593
594 if (IS_GEN4(dev)) {
595 mask = BACKLIGHT_DUTY_CYCLE_MASK;
596 } else {
597 level <<= 1;
598 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
599 }
600
601 tmp = I915_READ(BLC_PWM_CTL) & ~mask;
602 I915_WRITE(BLC_PWM_CTL, tmp | level);
603 }
604
vlv_set_backlight(struct intel_connector * connector,u32 level)605 static void vlv_set_backlight(struct intel_connector *connector, u32 level)
606 {
607 struct drm_device *dev = connector->base.dev;
608 struct drm_i915_private *dev_priv = dev->dev_private;
609 enum pipe pipe = intel_get_pipe_from_connector(connector);
610 u32 tmp;
611
612 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
613 return;
614
615 tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
616 I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
617 }
618
619 static void
intel_panel_actually_set_backlight(struct intel_connector * connector,u32 level)620 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
621 {
622 struct drm_device *dev = connector->base.dev;
623 struct drm_i915_private *dev_priv = dev->dev_private;
624
625 DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
626
627 level = intel_panel_compute_brightness(connector, level);
628 dev_priv->display.set_backlight(connector, level);
629 }
630
631 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
intel_panel_set_backlight(struct intel_connector * connector,u32 user_level,u32 user_max)632 static void intel_panel_set_backlight(struct intel_connector *connector,
633 u32 user_level, u32 user_max)
634 {
635 struct drm_device *dev = connector->base.dev;
636 struct drm_i915_private *dev_priv = dev->dev_private;
637 struct intel_panel *panel = &connector->panel;
638 u32 hw_level;
639
640 if (!panel->backlight.present)
641 return;
642
643 mutex_lock(&dev_priv->backlight_lock);
644
645 WARN_ON(panel->backlight.max == 0);
646
647 hw_level = scale_user_to_hw(connector, user_level, user_max);
648 panel->backlight.level = hw_level;
649
650 if (panel->backlight.enabled)
651 intel_panel_actually_set_backlight(connector, hw_level);
652
653 mutex_unlock(&dev_priv->backlight_lock);
654 }
655
656 /* set backlight brightness to level in range [0..max], assuming hw min is
657 * respected.
658 */
intel_panel_set_backlight_acpi(struct intel_connector * connector,u32 user_level,u32 user_max)659 void intel_panel_set_backlight_acpi(struct intel_connector *connector,
660 u32 user_level, u32 user_max)
661 {
662 struct drm_device *dev = connector->base.dev;
663 struct drm_i915_private *dev_priv = dev->dev_private;
664 struct intel_panel *panel = &connector->panel;
665 enum pipe pipe = intel_get_pipe_from_connector(connector);
666 u32 hw_level;
667
668 /*
669 * INVALID_PIPE may occur during driver init because
670 * connection_mutex isn't held across the entire backlight
671 * setup + modeset readout, and the BIOS can issue the
672 * requests at any time.
673 */
674 if (!panel->backlight.present || pipe == INVALID_PIPE)
675 return;
676
677 mutex_lock(&dev_priv->backlight_lock);
678
679 WARN_ON(panel->backlight.max == 0);
680
681 hw_level = clamp_user_to_hw(connector, user_level, user_max);
682 panel->backlight.level = hw_level;
683
684 if (panel->backlight.device)
685 panel->backlight.device->props.brightness =
686 scale_hw_to_user(connector,
687 panel->backlight.level,
688 panel->backlight.device->props.max_brightness);
689
690 if (panel->backlight.enabled)
691 intel_panel_actually_set_backlight(connector, hw_level);
692
693 mutex_unlock(&dev_priv->backlight_lock);
694 }
695
pch_disable_backlight(struct intel_connector * connector)696 static void pch_disable_backlight(struct intel_connector *connector)
697 {
698 struct drm_device *dev = connector->base.dev;
699 struct drm_i915_private *dev_priv = dev->dev_private;
700 u32 tmp;
701
702 intel_panel_actually_set_backlight(connector, 0);
703
704 tmp = I915_READ(BLC_PWM_CPU_CTL2);
705 I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
706
707 tmp = I915_READ(BLC_PWM_PCH_CTL1);
708 I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
709 }
710
i9xx_disable_backlight(struct intel_connector * connector)711 static void i9xx_disable_backlight(struct intel_connector *connector)
712 {
713 intel_panel_actually_set_backlight(connector, 0);
714 }
715
i965_disable_backlight(struct intel_connector * connector)716 static void i965_disable_backlight(struct intel_connector *connector)
717 {
718 struct drm_device *dev = connector->base.dev;
719 struct drm_i915_private *dev_priv = dev->dev_private;
720 u32 tmp;
721
722 intel_panel_actually_set_backlight(connector, 0);
723
724 tmp = I915_READ(BLC_PWM_CTL2);
725 I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
726 }
727
vlv_disable_backlight(struct intel_connector * connector)728 static void vlv_disable_backlight(struct intel_connector *connector)
729 {
730 struct drm_device *dev = connector->base.dev;
731 struct drm_i915_private *dev_priv = dev->dev_private;
732 enum pipe pipe = intel_get_pipe_from_connector(connector);
733 u32 tmp;
734
735 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
736 return;
737
738 intel_panel_actually_set_backlight(connector, 0);
739
740 tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
741 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
742 }
743
intel_panel_disable_backlight(struct intel_connector * connector)744 void intel_panel_disable_backlight(struct intel_connector *connector)
745 {
746 struct drm_device *dev = connector->base.dev;
747 struct drm_i915_private *dev_priv = dev->dev_private;
748 struct intel_panel *panel = &connector->panel;
749
750 if (!panel->backlight.present)
751 return;
752
753 /*
754 * Do not disable backlight on the vgaswitcheroo path. When switching
755 * away from i915, the other client may depend on i915 to handle the
756 * backlight. This will leave the backlight on unnecessarily when
757 * another client is not activated.
758 */
759 if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
760 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
761 return;
762 }
763
764 mutex_lock(&dev_priv->backlight_lock);
765
766 if (panel->backlight.device)
767 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
768 panel->backlight.enabled = false;
769 dev_priv->display.disable_backlight(connector);
770
771 mutex_unlock(&dev_priv->backlight_lock);
772 }
773
bdw_enable_backlight(struct intel_connector * connector)774 static void bdw_enable_backlight(struct intel_connector *connector)
775 {
776 struct drm_device *dev = connector->base.dev;
777 struct drm_i915_private *dev_priv = dev->dev_private;
778 struct intel_panel *panel = &connector->panel;
779 u32 pch_ctl1, pch_ctl2;
780
781 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
782 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
783 DRM_DEBUG_KMS("pch backlight already enabled\n");
784 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
785 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
786 }
787
788 pch_ctl2 = panel->backlight.max << 16;
789 I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
790
791 pch_ctl1 = 0;
792 if (panel->backlight.active_low_pwm)
793 pch_ctl1 |= BLM_PCH_POLARITY;
794
795 /* After LPT, override is the default. */
796 if (HAS_PCH_LPT(dev_priv))
797 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
798
799 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
800 POSTING_READ(BLC_PWM_PCH_CTL1);
801 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
802
803 /* This won't stick until the above enable. */
804 intel_panel_actually_set_backlight(connector, panel->backlight.level);
805 }
806
pch_enable_backlight(struct intel_connector * connector)807 static void pch_enable_backlight(struct intel_connector *connector)
808 {
809 struct drm_device *dev = connector->base.dev;
810 struct drm_i915_private *dev_priv = dev->dev_private;
811 struct intel_panel *panel = &connector->panel;
812 enum pipe pipe = intel_get_pipe_from_connector(connector);
813 enum transcoder cpu_transcoder =
814 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
815 u32 cpu_ctl2, pch_ctl1, pch_ctl2;
816
817 cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
818 if (cpu_ctl2 & BLM_PWM_ENABLE) {
819 DRM_DEBUG_KMS("cpu backlight already enabled\n");
820 cpu_ctl2 &= ~BLM_PWM_ENABLE;
821 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
822 }
823
824 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
825 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
826 DRM_DEBUG_KMS("pch backlight already enabled\n");
827 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
828 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
829 }
830
831 if (cpu_transcoder == TRANSCODER_EDP)
832 cpu_ctl2 = BLM_TRANSCODER_EDP;
833 else
834 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
835 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
836 POSTING_READ(BLC_PWM_CPU_CTL2);
837 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
838
839 /* This won't stick until the above enable. */
840 intel_panel_actually_set_backlight(connector, panel->backlight.level);
841
842 pch_ctl2 = panel->backlight.max << 16;
843 I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
844
845 pch_ctl1 = 0;
846 if (panel->backlight.active_low_pwm)
847 pch_ctl1 |= BLM_PCH_POLARITY;
848
849 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
850 POSTING_READ(BLC_PWM_PCH_CTL1);
851 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
852 }
853
i9xx_enable_backlight(struct intel_connector * connector)854 static void i9xx_enable_backlight(struct intel_connector *connector)
855 {
856 struct drm_device *dev = connector->base.dev;
857 struct drm_i915_private *dev_priv = dev->dev_private;
858 struct intel_panel *panel = &connector->panel;
859 u32 ctl, freq;
860
861 ctl = I915_READ(BLC_PWM_CTL);
862 if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
863 DRM_DEBUG_KMS("backlight already enabled\n");
864 I915_WRITE(BLC_PWM_CTL, 0);
865 }
866
867 freq = panel->backlight.max;
868 if (panel->backlight.combination_mode)
869 freq /= 0xff;
870
871 ctl = freq << 17;
872 if (panel->backlight.combination_mode)
873 ctl |= BLM_LEGACY_MODE;
874 if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
875 ctl |= BLM_POLARITY_PNV;
876
877 I915_WRITE(BLC_PWM_CTL, ctl);
878 POSTING_READ(BLC_PWM_CTL);
879
880 /* XXX: combine this into above write? */
881 intel_panel_actually_set_backlight(connector, panel->backlight.level);
882
883 /*
884 * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
885 * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
886 * that has backlight.
887 */
888 if (IS_GEN2(dev))
889 I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
890 }
891
i965_enable_backlight(struct intel_connector * connector)892 static void i965_enable_backlight(struct intel_connector *connector)
893 {
894 struct drm_device *dev = connector->base.dev;
895 struct drm_i915_private *dev_priv = dev->dev_private;
896 struct intel_panel *panel = &connector->panel;
897 enum pipe pipe = intel_get_pipe_from_connector(connector);
898 u32 ctl, ctl2, freq;
899
900 ctl2 = I915_READ(BLC_PWM_CTL2);
901 if (ctl2 & BLM_PWM_ENABLE) {
902 DRM_DEBUG_KMS("backlight already enabled\n");
903 ctl2 &= ~BLM_PWM_ENABLE;
904 I915_WRITE(BLC_PWM_CTL2, ctl2);
905 }
906
907 freq = panel->backlight.max;
908 if (panel->backlight.combination_mode)
909 freq /= 0xff;
910
911 ctl = freq << 16;
912 I915_WRITE(BLC_PWM_CTL, ctl);
913
914 ctl2 = BLM_PIPE(pipe);
915 if (panel->backlight.combination_mode)
916 ctl2 |= BLM_COMBINATION_MODE;
917 if (panel->backlight.active_low_pwm)
918 ctl2 |= BLM_POLARITY_I965;
919 I915_WRITE(BLC_PWM_CTL2, ctl2);
920 POSTING_READ(BLC_PWM_CTL2);
921 I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
922
923 intel_panel_actually_set_backlight(connector, panel->backlight.level);
924 }
925
vlv_enable_backlight(struct intel_connector * connector)926 static void vlv_enable_backlight(struct intel_connector *connector)
927 {
928 struct drm_device *dev = connector->base.dev;
929 struct drm_i915_private *dev_priv = dev->dev_private;
930 struct intel_panel *panel = &connector->panel;
931 enum pipe pipe = intel_get_pipe_from_connector(connector);
932 u32 ctl, ctl2;
933
934 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
935 return;
936
937 ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
938 if (ctl2 & BLM_PWM_ENABLE) {
939 DRM_DEBUG_KMS("backlight already enabled\n");
940 ctl2 &= ~BLM_PWM_ENABLE;
941 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
942 }
943
944 ctl = panel->backlight.max << 16;
945 I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
946
947 /* XXX: combine this into above write? */
948 intel_panel_actually_set_backlight(connector, panel->backlight.level);
949
950 ctl2 = 0;
951 if (panel->backlight.active_low_pwm)
952 ctl2 |= BLM_POLARITY_I965;
953 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
954 POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
955 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
956 }
957
intel_panel_enable_backlight(struct intel_connector * connector)958 void intel_panel_enable_backlight(struct intel_connector *connector)
959 {
960 struct drm_device *dev = connector->base.dev;
961 struct drm_i915_private *dev_priv = dev->dev_private;
962 struct intel_panel *panel = &connector->panel;
963 enum pipe pipe = intel_get_pipe_from_connector(connector);
964
965 if (!panel->backlight.present)
966 return;
967
968 DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
969
970 mutex_lock(&dev_priv->backlight_lock);
971
972 WARN_ON(panel->backlight.max == 0);
973
974 if (panel->backlight.level <= panel->backlight.min) {
975 panel->backlight.level = panel->backlight.max;
976 if (panel->backlight.device)
977 panel->backlight.device->props.brightness =
978 scale_hw_to_user(connector,
979 panel->backlight.level,
980 panel->backlight.device->props.max_brightness);
981 }
982
983 dev_priv->display.enable_backlight(connector);
984 panel->backlight.enabled = true;
985 if (panel->backlight.device)
986 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
987
988 mutex_unlock(&dev_priv->backlight_lock);
989 }
990
991 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
intel_backlight_device_update_status(struct backlight_device * bd)992 static int intel_backlight_device_update_status(struct backlight_device *bd)
993 {
994 struct intel_connector *connector = bl_get_data(bd);
995 struct intel_panel *panel = &connector->panel;
996 struct drm_device *dev = connector->base.dev;
997
998 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
999 DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1000 bd->props.brightness, bd->props.max_brightness);
1001 intel_panel_set_backlight(connector, bd->props.brightness,
1002 bd->props.max_brightness);
1003
1004 /*
1005 * Allow flipping bl_power as a sub-state of enabled. Sadly the
1006 * backlight class device does not make it easy to to differentiate
1007 * between callbacks for brightness and bl_power, so our backlight_power
1008 * callback needs to take this into account.
1009 */
1010 if (panel->backlight.enabled) {
1011 if (panel->backlight_power) {
1012 bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1013 bd->props.brightness != 0;
1014 panel->backlight_power(connector, enable);
1015 }
1016 } else {
1017 bd->props.power = FB_BLANK_POWERDOWN;
1018 }
1019
1020 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1021 return 0;
1022 }
1023
intel_backlight_device_get_brightness(struct backlight_device * bd)1024 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1025 {
1026 struct intel_connector *connector = bl_get_data(bd);
1027 struct drm_device *dev = connector->base.dev;
1028 struct drm_i915_private *dev_priv = dev->dev_private;
1029 u32 hw_level;
1030 int ret;
1031
1032 intel_runtime_pm_get(dev_priv);
1033 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1034
1035 hw_level = intel_panel_get_backlight(connector);
1036 ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
1037
1038 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1039 intel_runtime_pm_put(dev_priv);
1040
1041 return ret;
1042 }
1043
1044 static const struct backlight_ops intel_backlight_device_ops = {
1045 .update_status = intel_backlight_device_update_status,
1046 .get_brightness = intel_backlight_device_get_brightness,
1047 };
1048
intel_backlight_device_register(struct intel_connector * connector)1049 static int intel_backlight_device_register(struct intel_connector *connector)
1050 {
1051 struct intel_panel *panel = &connector->panel;
1052 struct backlight_properties props;
1053
1054 if (WARN_ON(panel->backlight.device))
1055 return -ENODEV;
1056
1057 if (!panel->backlight.present)
1058 return 0;
1059
1060 WARN_ON(panel->backlight.max == 0);
1061
1062 memset(&props, 0, sizeof(props));
1063 props.type = BACKLIGHT_RAW;
1064
1065 /*
1066 * Note: Everything should work even if the backlight device max
1067 * presented to the userspace is arbitrarily chosen.
1068 */
1069 props.max_brightness = panel->backlight.max;
1070 props.brightness = scale_hw_to_user(connector,
1071 panel->backlight.level,
1072 props.max_brightness);
1073
1074 if (panel->backlight.enabled)
1075 props.power = FB_BLANK_UNBLANK;
1076 else
1077 props.power = FB_BLANK_POWERDOWN;
1078
1079 /*
1080 * Note: using the same name independent of the connector prevents
1081 * registration of multiple backlight devices in the driver.
1082 */
1083 panel->backlight.device =
1084 backlight_device_register("intel_backlight",
1085 connector->base.kdev,
1086 connector,
1087 &intel_backlight_device_ops, &props);
1088
1089 if (IS_ERR(panel->backlight.device)) {
1090 DRM_ERROR("Failed to register backlight: %ld\n",
1091 PTR_ERR(panel->backlight.device));
1092 panel->backlight.device = NULL;
1093 return -ENODEV;
1094 }
1095
1096 DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1097 connector->base.name);
1098
1099 return 0;
1100 }
1101
intel_backlight_device_unregister(struct intel_connector * connector)1102 static void intel_backlight_device_unregister(struct intel_connector *connector)
1103 {
1104 struct intel_panel *panel = &connector->panel;
1105
1106 if (panel->backlight.device) {
1107 backlight_device_unregister(panel->backlight.device);
1108 panel->backlight.device = NULL;
1109 }
1110 }
1111 #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
intel_backlight_device_register(struct intel_connector * connector)1112 static int intel_backlight_device_register(struct intel_connector *connector)
1113 {
1114 return 0;
1115 }
intel_backlight_device_unregister(struct intel_connector * connector)1116 static void intel_backlight_device_unregister(struct intel_connector *connector)
1117 {
1118 }
1119 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1120
1121 /*
1122 * Note: The setup hooks can't assume pipe is set!
1123 *
1124 * XXX: Query mode clock or hardware clock and program PWM modulation frequency
1125 * appropriately when it's 0. Use VBT and/or sane defaults.
1126 */
get_backlight_min_vbt(struct intel_connector * connector)1127 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1128 {
1129 struct drm_device *dev = connector->base.dev;
1130 struct drm_i915_private *dev_priv = dev->dev_private;
1131 struct intel_panel *panel = &connector->panel;
1132 int min;
1133
1134 WARN_ON(panel->backlight.max == 0);
1135
1136 /*
1137 * XXX: If the vbt value is 255, it makes min equal to max, which leads
1138 * to problems. There are such machines out there. Either our
1139 * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1140 * against this by letting the minimum be at most (arbitrarily chosen)
1141 * 25% of the max.
1142 */
1143 min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1144 if (min != dev_priv->vbt.backlight.min_brightness) {
1145 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1146 dev_priv->vbt.backlight.min_brightness, min);
1147 }
1148
1149 /* vbt value is a coefficient in range [0..255] */
1150 return scale(min, 0, 255, 0, panel->backlight.max);
1151 }
1152
bdw_setup_backlight(struct intel_connector * connector,enum pipe unused)1153 static int bdw_setup_backlight(struct intel_connector *connector, enum pipe unused)
1154 {
1155 struct drm_device *dev = connector->base.dev;
1156 struct drm_i915_private *dev_priv = dev->dev_private;
1157 struct intel_panel *panel = &connector->panel;
1158 u32 pch_ctl1, pch_ctl2, val;
1159
1160 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1161 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1162
1163 pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1164 panel->backlight.max = pch_ctl2 >> 16;
1165 if (!panel->backlight.max)
1166 return -ENODEV;
1167
1168 panel->backlight.min = get_backlight_min_vbt(connector);
1169
1170 val = bdw_get_backlight(connector);
1171 panel->backlight.level = intel_panel_compute_brightness(connector, val);
1172
1173 panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) &&
1174 panel->backlight.level != 0;
1175
1176 return 0;
1177 }
1178
pch_setup_backlight(struct intel_connector * connector,enum pipe unused)1179 static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
1180 {
1181 struct drm_device *dev = connector->base.dev;
1182 struct drm_i915_private *dev_priv = dev->dev_private;
1183 struct intel_panel *panel = &connector->panel;
1184 u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1185
1186 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1187 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1188
1189 pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1190 panel->backlight.max = pch_ctl2 >> 16;
1191 if (!panel->backlight.max)
1192 return -ENODEV;
1193
1194 panel->backlight.min = get_backlight_min_vbt(connector);
1195
1196 val = pch_get_backlight(connector);
1197 panel->backlight.level = intel_panel_compute_brightness(connector, val);
1198
1199 cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1200 panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1201 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
1202
1203 return 0;
1204 }
1205
i9xx_setup_backlight(struct intel_connector * connector,enum pipe unused)1206 static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
1207 {
1208 struct drm_device *dev = connector->base.dev;
1209 struct drm_i915_private *dev_priv = dev->dev_private;
1210 struct intel_panel *panel = &connector->panel;
1211 u32 ctl, val;
1212
1213 ctl = I915_READ(BLC_PWM_CTL);
1214
1215 if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev))
1216 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1217
1218 if (IS_PINEVIEW(dev))
1219 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1220
1221 panel->backlight.max = ctl >> 17;
1222 if (panel->backlight.combination_mode)
1223 panel->backlight.max *= 0xff;
1224
1225 if (!panel->backlight.max)
1226 return -ENODEV;
1227
1228 panel->backlight.min = get_backlight_min_vbt(connector);
1229
1230 val = i9xx_get_backlight(connector);
1231 panel->backlight.level = intel_panel_compute_brightness(connector, val);
1232
1233 panel->backlight.enabled = panel->backlight.level != 0;
1234
1235 return 0;
1236 }
1237
i965_setup_backlight(struct intel_connector * connector,enum pipe unused)1238 static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
1239 {
1240 struct drm_device *dev = connector->base.dev;
1241 struct drm_i915_private *dev_priv = dev->dev_private;
1242 struct intel_panel *panel = &connector->panel;
1243 u32 ctl, ctl2, val;
1244
1245 ctl2 = I915_READ(BLC_PWM_CTL2);
1246 panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1247 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1248
1249 ctl = I915_READ(BLC_PWM_CTL);
1250 panel->backlight.max = ctl >> 16;
1251 if (panel->backlight.combination_mode)
1252 panel->backlight.max *= 0xff;
1253
1254 if (!panel->backlight.max)
1255 return -ENODEV;
1256
1257 panel->backlight.min = get_backlight_min_vbt(connector);
1258
1259 val = i9xx_get_backlight(connector);
1260 panel->backlight.level = intel_panel_compute_brightness(connector, val);
1261
1262 panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1263 panel->backlight.level != 0;
1264
1265 return 0;
1266 }
1267
vlv_setup_backlight(struct intel_connector * connector,enum pipe pipe)1268 static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1269 {
1270 struct drm_device *dev = connector->base.dev;
1271 struct drm_i915_private *dev_priv = dev->dev_private;
1272 struct intel_panel *panel = &connector->panel;
1273 enum pipe p;
1274 u32 ctl, ctl2, val;
1275
1276 for_each_pipe(dev_priv, p) {
1277 u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(p));
1278
1279 /* Skip if the modulation freq is already set */
1280 if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK)
1281 continue;
1282
1283 cur_val &= BACKLIGHT_DUTY_CYCLE_MASK;
1284 I915_WRITE(VLV_BLC_PWM_CTL(p), (0xf42 << 16) |
1285 cur_val);
1286 }
1287
1288 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1289 return -ENODEV;
1290
1291 ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1292 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1293
1294 ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
1295 panel->backlight.max = ctl >> 16;
1296 if (!panel->backlight.max)
1297 return -ENODEV;
1298
1299 panel->backlight.min = get_backlight_min_vbt(connector);
1300
1301 val = _vlv_get_backlight(dev, pipe);
1302 panel->backlight.level = intel_panel_compute_brightness(connector, val);
1303
1304 panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
1305 panel->backlight.level != 0;
1306
1307 return 0;
1308 }
1309
intel_panel_setup_backlight(struct drm_connector * connector,enum pipe pipe)1310 int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
1311 {
1312 struct drm_device *dev = connector->dev;
1313 struct drm_i915_private *dev_priv = dev->dev_private;
1314 struct intel_connector *intel_connector = to_intel_connector(connector);
1315 struct intel_panel *panel = &intel_connector->panel;
1316 int ret;
1317
1318 if (!dev_priv->vbt.backlight.present) {
1319 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1320 DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1321 } else {
1322 DRM_DEBUG_KMS("no backlight present per VBT\n");
1323 return 0;
1324 }
1325 }
1326
1327 /* set level and max in panel struct */
1328 mutex_lock(&dev_priv->backlight_lock);
1329 ret = dev_priv->display.setup_backlight(intel_connector, pipe);
1330 mutex_unlock(&dev_priv->backlight_lock);
1331
1332 if (ret) {
1333 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1334 connector->name);
1335 return ret;
1336 }
1337
1338 panel->backlight.present = true;
1339
1340 DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1341 connector->name,
1342 panel->backlight.enabled ? "enabled" : "disabled",
1343 panel->backlight.level, panel->backlight.max);
1344
1345 return 0;
1346 }
1347
intel_panel_destroy_backlight(struct drm_connector * connector)1348 void intel_panel_destroy_backlight(struct drm_connector *connector)
1349 {
1350 struct intel_connector *intel_connector = to_intel_connector(connector);
1351 struct intel_panel *panel = &intel_connector->panel;
1352
1353 panel->backlight.present = false;
1354 }
1355
1356 /* Set up chip specific backlight functions */
intel_panel_init_backlight_funcs(struct drm_device * dev)1357 void intel_panel_init_backlight_funcs(struct drm_device *dev)
1358 {
1359 struct drm_i915_private *dev_priv = dev->dev_private;
1360
1361 if (IS_BROADWELL(dev) || (INTEL_INFO(dev)->gen >= 9)) {
1362 dev_priv->display.setup_backlight = bdw_setup_backlight;
1363 dev_priv->display.enable_backlight = bdw_enable_backlight;
1364 dev_priv->display.disable_backlight = pch_disable_backlight;
1365 dev_priv->display.set_backlight = bdw_set_backlight;
1366 dev_priv->display.get_backlight = bdw_get_backlight;
1367 } else if (HAS_PCH_SPLIT(dev)) {
1368 dev_priv->display.setup_backlight = pch_setup_backlight;
1369 dev_priv->display.enable_backlight = pch_enable_backlight;
1370 dev_priv->display.disable_backlight = pch_disable_backlight;
1371 dev_priv->display.set_backlight = pch_set_backlight;
1372 dev_priv->display.get_backlight = pch_get_backlight;
1373 } else if (IS_VALLEYVIEW(dev)) {
1374 dev_priv->display.setup_backlight = vlv_setup_backlight;
1375 dev_priv->display.enable_backlight = vlv_enable_backlight;
1376 dev_priv->display.disable_backlight = vlv_disable_backlight;
1377 dev_priv->display.set_backlight = vlv_set_backlight;
1378 dev_priv->display.get_backlight = vlv_get_backlight;
1379 } else if (IS_GEN4(dev)) {
1380 dev_priv->display.setup_backlight = i965_setup_backlight;
1381 dev_priv->display.enable_backlight = i965_enable_backlight;
1382 dev_priv->display.disable_backlight = i965_disable_backlight;
1383 dev_priv->display.set_backlight = i9xx_set_backlight;
1384 dev_priv->display.get_backlight = i9xx_get_backlight;
1385 } else {
1386 dev_priv->display.setup_backlight = i9xx_setup_backlight;
1387 dev_priv->display.enable_backlight = i9xx_enable_backlight;
1388 dev_priv->display.disable_backlight = i9xx_disable_backlight;
1389 dev_priv->display.set_backlight = i9xx_set_backlight;
1390 dev_priv->display.get_backlight = i9xx_get_backlight;
1391 }
1392 }
1393
intel_panel_init(struct intel_panel * panel,struct drm_display_mode * fixed_mode,struct drm_display_mode * downclock_mode)1394 int intel_panel_init(struct intel_panel *panel,
1395 struct drm_display_mode *fixed_mode,
1396 struct drm_display_mode *downclock_mode)
1397 {
1398 panel->fixed_mode = fixed_mode;
1399 panel->downclock_mode = downclock_mode;
1400
1401 return 0;
1402 }
1403
intel_panel_fini(struct intel_panel * panel)1404 void intel_panel_fini(struct intel_panel *panel)
1405 {
1406 struct intel_connector *intel_connector =
1407 container_of(panel, struct intel_connector, panel);
1408
1409 if (panel->fixed_mode)
1410 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
1411
1412 if (panel->downclock_mode)
1413 drm_mode_destroy(intel_connector->base.dev,
1414 panel->downclock_mode);
1415 }
1416
intel_backlight_register(struct drm_device * dev)1417 void intel_backlight_register(struct drm_device *dev)
1418 {
1419 struct intel_connector *connector;
1420
1421 list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1422 intel_backlight_device_register(connector);
1423 }
1424
intel_backlight_unregister(struct drm_device * dev)1425 void intel_backlight_unregister(struct drm_device *dev)
1426 {
1427 struct intel_connector *connector;
1428
1429 list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
1430 intel_backlight_device_unregister(connector);
1431 }
1432