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 <linux/pwm.h>
36
37 #include "intel_connector.h"
38 #include "intel_display_types.h"
39 #include "intel_dp_aux_backlight.h"
40 #include "intel_dsi_dcs_backlight.h"
41 #include "intel_panel.h"
42
43 void
intel_fixed_panel_mode(const struct drm_display_mode * fixed_mode,struct drm_display_mode * adjusted_mode)44 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
45 struct drm_display_mode *adjusted_mode)
46 {
47 drm_mode_copy(adjusted_mode, fixed_mode);
48
49 drm_mode_set_crtcinfo(adjusted_mode, 0);
50 }
51
is_downclock_mode(const struct drm_display_mode * downclock_mode,const struct drm_display_mode * fixed_mode)52 static bool is_downclock_mode(const struct drm_display_mode *downclock_mode,
53 const struct drm_display_mode *fixed_mode)
54 {
55 return drm_mode_match(downclock_mode, fixed_mode,
56 DRM_MODE_MATCH_TIMINGS |
57 DRM_MODE_MATCH_FLAGS |
58 DRM_MODE_MATCH_3D_FLAGS) &&
59 downclock_mode->clock < fixed_mode->clock;
60 }
61
62 struct drm_display_mode *
intel_panel_edid_downclock_mode(struct intel_connector * connector,const struct drm_display_mode * fixed_mode)63 intel_panel_edid_downclock_mode(struct intel_connector *connector,
64 const struct drm_display_mode *fixed_mode)
65 {
66 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
67 const struct drm_display_mode *scan, *best_mode = NULL;
68 struct drm_display_mode *downclock_mode;
69 int best_clock = fixed_mode->clock;
70
71 list_for_each_entry(scan, &connector->base.probed_modes, head) {
72 /*
73 * If one mode has the same resolution with the fixed_panel
74 * mode while they have the different refresh rate, it means
75 * that the reduced downclock is found. In such
76 * case we can set the different FPx0/1 to dynamically select
77 * between low and high frequency.
78 */
79 if (is_downclock_mode(scan, fixed_mode) &&
80 scan->clock < best_clock) {
81 /*
82 * The downclock is already found. But we
83 * expect to find the lower downclock.
84 */
85 best_clock = scan->clock;
86 best_mode = scan;
87 }
88 }
89
90 if (!best_mode)
91 return NULL;
92
93 downclock_mode = drm_mode_duplicate(&dev_priv->drm, best_mode);
94 if (!downclock_mode)
95 return NULL;
96
97 drm_dbg_kms(&dev_priv->drm,
98 "[CONNECTOR:%d:%s] using downclock mode from EDID: ",
99 connector->base.base.id, connector->base.name);
100 drm_mode_debug_printmodeline(downclock_mode);
101
102 return downclock_mode;
103 }
104
105 struct drm_display_mode *
intel_panel_edid_fixed_mode(struct intel_connector * connector)106 intel_panel_edid_fixed_mode(struct intel_connector *connector)
107 {
108 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
109 const struct drm_display_mode *scan;
110 struct drm_display_mode *fixed_mode;
111
112 if (list_empty(&connector->base.probed_modes))
113 return NULL;
114
115 /* prefer fixed mode from EDID if available */
116 list_for_each_entry(scan, &connector->base.probed_modes, head) {
117 if ((scan->type & DRM_MODE_TYPE_PREFERRED) == 0)
118 continue;
119
120 fixed_mode = drm_mode_duplicate(&dev_priv->drm, scan);
121 if (!fixed_mode)
122 return NULL;
123
124 drm_dbg_kms(&dev_priv->drm,
125 "[CONNECTOR:%d:%s] using preferred mode from EDID: ",
126 connector->base.base.id, connector->base.name);
127 drm_mode_debug_printmodeline(fixed_mode);
128
129 return fixed_mode;
130 }
131
132 scan = list_first_entry(&connector->base.probed_modes,
133 typeof(*scan), head);
134
135 fixed_mode = drm_mode_duplicate(&dev_priv->drm, scan);
136 if (!fixed_mode)
137 return NULL;
138
139 fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
140
141 drm_dbg_kms(&dev_priv->drm,
142 "[CONNECTOR:%d:%s] using first mode from EDID: ",
143 connector->base.base.id, connector->base.name);
144 drm_mode_debug_printmodeline(fixed_mode);
145
146 return fixed_mode;
147 }
148
149 struct drm_display_mode *
intel_panel_vbt_fixed_mode(struct intel_connector * connector)150 intel_panel_vbt_fixed_mode(struct intel_connector *connector)
151 {
152 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
153 struct drm_display_info *info = &connector->base.display_info;
154 struct drm_display_mode *fixed_mode;
155
156 if (!dev_priv->vbt.lfp_lvds_vbt_mode)
157 return NULL;
158
159 fixed_mode = drm_mode_duplicate(&dev_priv->drm,
160 dev_priv->vbt.lfp_lvds_vbt_mode);
161 if (!fixed_mode)
162 return NULL;
163
164 fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
165
166 drm_dbg_kms(&dev_priv->drm, "[CONNECTOR:%d:%s] using mode from VBT: ",
167 connector->base.base.id, connector->base.name);
168 drm_mode_debug_printmodeline(fixed_mode);
169
170 info->width_mm = fixed_mode->width_mm;
171 info->height_mm = fixed_mode->height_mm;
172
173 return fixed_mode;
174 }
175
176 /* adjusted_mode has been preset to be the panel's fixed mode */
intel_pch_panel_fitting(struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state)177 int intel_pch_panel_fitting(struct intel_crtc_state *crtc_state,
178 const struct drm_connector_state *conn_state)
179 {
180 const struct drm_display_mode *adjusted_mode =
181 &crtc_state->hw.adjusted_mode;
182 int x, y, width, height;
183
184 /* Native modes don't need fitting */
185 if (adjusted_mode->crtc_hdisplay == crtc_state->pipe_src_w &&
186 adjusted_mode->crtc_vdisplay == crtc_state->pipe_src_h &&
187 crtc_state->output_format != INTEL_OUTPUT_FORMAT_YCBCR420)
188 return 0;
189
190 switch (conn_state->scaling_mode) {
191 case DRM_MODE_SCALE_CENTER:
192 width = crtc_state->pipe_src_w;
193 height = crtc_state->pipe_src_h;
194 x = (adjusted_mode->crtc_hdisplay - width + 1)/2;
195 y = (adjusted_mode->crtc_vdisplay - height + 1)/2;
196 break;
197
198 case DRM_MODE_SCALE_ASPECT:
199 /* Scale but preserve the aspect ratio */
200 {
201 u32 scaled_width = adjusted_mode->crtc_hdisplay
202 * crtc_state->pipe_src_h;
203 u32 scaled_height = crtc_state->pipe_src_w
204 * adjusted_mode->crtc_vdisplay;
205 if (scaled_width > scaled_height) { /* pillar */
206 width = scaled_height / crtc_state->pipe_src_h;
207 if (width & 1)
208 width++;
209 x = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
210 y = 0;
211 height = adjusted_mode->crtc_vdisplay;
212 } else if (scaled_width < scaled_height) { /* letter */
213 height = scaled_width / crtc_state->pipe_src_w;
214 if (height & 1)
215 height++;
216 y = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
217 x = 0;
218 width = adjusted_mode->crtc_hdisplay;
219 } else {
220 x = y = 0;
221 width = adjusted_mode->crtc_hdisplay;
222 height = adjusted_mode->crtc_vdisplay;
223 }
224 }
225 break;
226
227 case DRM_MODE_SCALE_NONE:
228 WARN_ON(adjusted_mode->crtc_hdisplay != crtc_state->pipe_src_w);
229 WARN_ON(adjusted_mode->crtc_vdisplay != crtc_state->pipe_src_h);
230 fallthrough;
231 case DRM_MODE_SCALE_FULLSCREEN:
232 x = y = 0;
233 width = adjusted_mode->crtc_hdisplay;
234 height = adjusted_mode->crtc_vdisplay;
235 break;
236
237 default:
238 MISSING_CASE(conn_state->scaling_mode);
239 return -EINVAL;
240 }
241
242 drm_rect_init(&crtc_state->pch_pfit.dst,
243 x, y, width, height);
244 crtc_state->pch_pfit.enabled = true;
245
246 return 0;
247 }
248
249 static void
centre_horizontally(struct drm_display_mode * adjusted_mode,int width)250 centre_horizontally(struct drm_display_mode *adjusted_mode,
251 int width)
252 {
253 u32 border, sync_pos, blank_width, sync_width;
254
255 /* keep the hsync and hblank widths constant */
256 sync_width = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;
257 blank_width = adjusted_mode->crtc_hblank_end - adjusted_mode->crtc_hblank_start;
258 sync_pos = (blank_width - sync_width + 1) / 2;
259
260 border = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
261 border += border & 1; /* make the border even */
262
263 adjusted_mode->crtc_hdisplay = width;
264 adjusted_mode->crtc_hblank_start = width + border;
265 adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_hblank_start + blank_width;
266
267 adjusted_mode->crtc_hsync_start = adjusted_mode->crtc_hblank_start + sync_pos;
268 adjusted_mode->crtc_hsync_end = adjusted_mode->crtc_hsync_start + sync_width;
269 }
270
271 static void
centre_vertically(struct drm_display_mode * adjusted_mode,int height)272 centre_vertically(struct drm_display_mode *adjusted_mode,
273 int height)
274 {
275 u32 border, sync_pos, blank_width, sync_width;
276
277 /* keep the vsync and vblank widths constant */
278 sync_width = adjusted_mode->crtc_vsync_end - adjusted_mode->crtc_vsync_start;
279 blank_width = adjusted_mode->crtc_vblank_end - adjusted_mode->crtc_vblank_start;
280 sync_pos = (blank_width - sync_width + 1) / 2;
281
282 border = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
283
284 adjusted_mode->crtc_vdisplay = height;
285 adjusted_mode->crtc_vblank_start = height + border;
286 adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vblank_start + blank_width;
287
288 adjusted_mode->crtc_vsync_start = adjusted_mode->crtc_vblank_start + sync_pos;
289 adjusted_mode->crtc_vsync_end = adjusted_mode->crtc_vsync_start + sync_width;
290 }
291
panel_fitter_scaling(u32 source,u32 target)292 static u32 panel_fitter_scaling(u32 source, u32 target)
293 {
294 /*
295 * Floating point operation is not supported. So the FACTOR
296 * is defined, which can avoid the floating point computation
297 * when calculating the panel ratio.
298 */
299 #define ACCURACY 12
300 #define FACTOR (1 << ACCURACY)
301 u32 ratio = source * FACTOR / target;
302 return (FACTOR * ratio + FACTOR/2) / FACTOR;
303 }
304
i965_scale_aspect(struct intel_crtc_state * crtc_state,u32 * pfit_control)305 static void i965_scale_aspect(struct intel_crtc_state *crtc_state,
306 u32 *pfit_control)
307 {
308 const struct drm_display_mode *adjusted_mode =
309 &crtc_state->hw.adjusted_mode;
310 u32 scaled_width = adjusted_mode->crtc_hdisplay *
311 crtc_state->pipe_src_h;
312 u32 scaled_height = crtc_state->pipe_src_w *
313 adjusted_mode->crtc_vdisplay;
314
315 /* 965+ is easy, it does everything in hw */
316 if (scaled_width > scaled_height)
317 *pfit_control |= PFIT_ENABLE |
318 PFIT_SCALING_PILLAR;
319 else if (scaled_width < scaled_height)
320 *pfit_control |= PFIT_ENABLE |
321 PFIT_SCALING_LETTER;
322 else if (adjusted_mode->crtc_hdisplay != crtc_state->pipe_src_w)
323 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
324 }
325
i9xx_scale_aspect(struct intel_crtc_state * crtc_state,u32 * pfit_control,u32 * pfit_pgm_ratios,u32 * border)326 static void i9xx_scale_aspect(struct intel_crtc_state *crtc_state,
327 u32 *pfit_control, u32 *pfit_pgm_ratios,
328 u32 *border)
329 {
330 struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
331 u32 scaled_width = adjusted_mode->crtc_hdisplay *
332 crtc_state->pipe_src_h;
333 u32 scaled_height = crtc_state->pipe_src_w *
334 adjusted_mode->crtc_vdisplay;
335 u32 bits;
336
337 /*
338 * For earlier chips we have to calculate the scaling
339 * ratio by hand and program it into the
340 * PFIT_PGM_RATIO register
341 */
342 if (scaled_width > scaled_height) { /* pillar */
343 centre_horizontally(adjusted_mode,
344 scaled_height /
345 crtc_state->pipe_src_h);
346
347 *border = LVDS_BORDER_ENABLE;
348 if (crtc_state->pipe_src_h != adjusted_mode->crtc_vdisplay) {
349 bits = panel_fitter_scaling(crtc_state->pipe_src_h,
350 adjusted_mode->crtc_vdisplay);
351
352 *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
353 bits << PFIT_VERT_SCALE_SHIFT);
354 *pfit_control |= (PFIT_ENABLE |
355 VERT_INTERP_BILINEAR |
356 HORIZ_INTERP_BILINEAR);
357 }
358 } else if (scaled_width < scaled_height) { /* letter */
359 centre_vertically(adjusted_mode,
360 scaled_width /
361 crtc_state->pipe_src_w);
362
363 *border = LVDS_BORDER_ENABLE;
364 if (crtc_state->pipe_src_w != adjusted_mode->crtc_hdisplay) {
365 bits = panel_fitter_scaling(crtc_state->pipe_src_w,
366 adjusted_mode->crtc_hdisplay);
367
368 *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
369 bits << PFIT_VERT_SCALE_SHIFT);
370 *pfit_control |= (PFIT_ENABLE |
371 VERT_INTERP_BILINEAR |
372 HORIZ_INTERP_BILINEAR);
373 }
374 } else {
375 /* Aspects match, Let hw scale both directions */
376 *pfit_control |= (PFIT_ENABLE |
377 VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
378 VERT_INTERP_BILINEAR |
379 HORIZ_INTERP_BILINEAR);
380 }
381 }
382
intel_gmch_panel_fitting(struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state)383 int intel_gmch_panel_fitting(struct intel_crtc_state *crtc_state,
384 const struct drm_connector_state *conn_state)
385 {
386 struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
387 struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
388 u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
389 struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
390
391 /* Native modes don't need fitting */
392 if (adjusted_mode->crtc_hdisplay == crtc_state->pipe_src_w &&
393 adjusted_mode->crtc_vdisplay == crtc_state->pipe_src_h)
394 goto out;
395
396 switch (conn_state->scaling_mode) {
397 case DRM_MODE_SCALE_CENTER:
398 /*
399 * For centered modes, we have to calculate border widths &
400 * heights and modify the values programmed into the CRTC.
401 */
402 centre_horizontally(adjusted_mode, crtc_state->pipe_src_w);
403 centre_vertically(adjusted_mode, crtc_state->pipe_src_h);
404 border = LVDS_BORDER_ENABLE;
405 break;
406 case DRM_MODE_SCALE_ASPECT:
407 /* Scale but preserve the aspect ratio */
408 if (DISPLAY_VER(dev_priv) >= 4)
409 i965_scale_aspect(crtc_state, &pfit_control);
410 else
411 i9xx_scale_aspect(crtc_state, &pfit_control,
412 &pfit_pgm_ratios, &border);
413 break;
414 case DRM_MODE_SCALE_FULLSCREEN:
415 /*
416 * Full scaling, even if it changes the aspect ratio.
417 * Fortunately this is all done for us in hw.
418 */
419 if (crtc_state->pipe_src_h != adjusted_mode->crtc_vdisplay ||
420 crtc_state->pipe_src_w != adjusted_mode->crtc_hdisplay) {
421 pfit_control |= PFIT_ENABLE;
422 if (DISPLAY_VER(dev_priv) >= 4)
423 pfit_control |= PFIT_SCALING_AUTO;
424 else
425 pfit_control |= (VERT_AUTO_SCALE |
426 VERT_INTERP_BILINEAR |
427 HORIZ_AUTO_SCALE |
428 HORIZ_INTERP_BILINEAR);
429 }
430 break;
431 default:
432 MISSING_CASE(conn_state->scaling_mode);
433 return -EINVAL;
434 }
435
436 /* 965+ wants fuzzy fitting */
437 /* FIXME: handle multiple panels by failing gracefully */
438 if (DISPLAY_VER(dev_priv) >= 4)
439 pfit_control |= PFIT_PIPE(crtc->pipe) | PFIT_FILTER_FUZZY;
440
441 out:
442 if ((pfit_control & PFIT_ENABLE) == 0) {
443 pfit_control = 0;
444 pfit_pgm_ratios = 0;
445 }
446
447 /* Make sure pre-965 set dither correctly for 18bpp panels. */
448 if (DISPLAY_VER(dev_priv) < 4 && crtc_state->pipe_bpp == 18)
449 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
450
451 crtc_state->gmch_pfit.control = pfit_control;
452 crtc_state->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
453 crtc_state->gmch_pfit.lvds_border_bits = border;
454
455 return 0;
456 }
457
458 /**
459 * scale - scale values from one range to another
460 * @source_val: value in range [@source_min..@source_max]
461 * @source_min: minimum legal value for @source_val
462 * @source_max: maximum legal value for @source_val
463 * @target_min: corresponding target value for @source_min
464 * @target_max: corresponding target value for @source_max
465 *
466 * Return @source_val in range [@source_min..@source_max] scaled to range
467 * [@target_min..@target_max].
468 */
scale(u32 source_val,u32 source_min,u32 source_max,u32 target_min,u32 target_max)469 static u32 scale(u32 source_val,
470 u32 source_min, u32 source_max,
471 u32 target_min, u32 target_max)
472 {
473 u64 target_val;
474
475 WARN_ON(source_min > source_max);
476 WARN_ON(target_min > target_max);
477
478 /* defensive */
479 source_val = clamp(source_val, source_min, source_max);
480
481 /* avoid overflows */
482 target_val = mul_u32_u32(source_val - source_min,
483 target_max - target_min);
484 target_val = DIV_ROUND_CLOSEST_ULL(target_val, source_max - source_min);
485 target_val += target_min;
486
487 return target_val;
488 }
489
490 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
491 * to [hw_min..hw_max]. */
clamp_user_to_hw(struct intel_connector * connector,u32 user_level,u32 user_max)492 static u32 clamp_user_to_hw(struct intel_connector *connector,
493 u32 user_level, u32 user_max)
494 {
495 struct intel_panel *panel = &connector->panel;
496 u32 hw_level;
497
498 hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
499 hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
500
501 return hw_level;
502 }
503
504 /* 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)505 static u32 scale_hw_to_user(struct intel_connector *connector,
506 u32 hw_level, u32 user_max)
507 {
508 struct intel_panel *panel = &connector->panel;
509
510 return scale(hw_level, panel->backlight.min, panel->backlight.max,
511 0, user_max);
512 }
513
intel_panel_invert_pwm_level(struct intel_connector * connector,u32 val)514 u32 intel_panel_invert_pwm_level(struct intel_connector *connector, u32 val)
515 {
516 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
517 struct intel_panel *panel = &connector->panel;
518
519 drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_level_max == 0);
520
521 if (dev_priv->params.invert_brightness < 0)
522 return val;
523
524 if (dev_priv->params.invert_brightness > 0 ||
525 dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
526 return panel->backlight.pwm_level_max - val + panel->backlight.pwm_level_min;
527 }
528
529 return val;
530 }
531
intel_panel_set_pwm_level(const struct drm_connector_state * conn_state,u32 val)532 void intel_panel_set_pwm_level(const struct drm_connector_state *conn_state, u32 val)
533 {
534 struct intel_connector *connector = to_intel_connector(conn_state->connector);
535 struct drm_i915_private *i915 = to_i915(connector->base.dev);
536 struct intel_panel *panel = &connector->panel;
537
538 drm_dbg_kms(&i915->drm, "set backlight PWM = %d\n", val);
539 panel->backlight.pwm_funcs->set(conn_state, val);
540 }
541
intel_panel_backlight_level_to_pwm(struct intel_connector * connector,u32 val)542 u32 intel_panel_backlight_level_to_pwm(struct intel_connector *connector, u32 val)
543 {
544 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
545 struct intel_panel *panel = &connector->panel;
546
547 drm_WARN_ON_ONCE(&dev_priv->drm,
548 panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0);
549
550 val = scale(val, panel->backlight.min, panel->backlight.max,
551 panel->backlight.pwm_level_min, panel->backlight.pwm_level_max);
552
553 return intel_panel_invert_pwm_level(connector, val);
554 }
555
intel_panel_backlight_level_from_pwm(struct intel_connector * connector,u32 val)556 u32 intel_panel_backlight_level_from_pwm(struct intel_connector *connector, u32 val)
557 {
558 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
559 struct intel_panel *panel = &connector->panel;
560
561 drm_WARN_ON_ONCE(&dev_priv->drm,
562 panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0);
563
564 if (dev_priv->params.invert_brightness > 0 ||
565 (dev_priv->params.invert_brightness == 0 && dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS))
566 val = panel->backlight.pwm_level_max - (val - panel->backlight.pwm_level_min);
567
568 return scale(val, panel->backlight.pwm_level_min, panel->backlight.pwm_level_max,
569 panel->backlight.min, panel->backlight.max);
570 }
571
lpt_get_backlight(struct intel_connector * connector,enum pipe unused)572 static u32 lpt_get_backlight(struct intel_connector *connector, enum pipe unused)
573 {
574 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
575
576 return intel_de_read(dev_priv, BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
577 }
578
pch_get_backlight(struct intel_connector * connector,enum pipe unused)579 static u32 pch_get_backlight(struct intel_connector *connector, enum pipe unused)
580 {
581 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
582
583 return intel_de_read(dev_priv, BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
584 }
585
i9xx_get_backlight(struct intel_connector * connector,enum pipe unused)586 static u32 i9xx_get_backlight(struct intel_connector *connector, enum pipe unused)
587 {
588 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
589 struct intel_panel *panel = &connector->panel;
590 u32 val;
591
592 val = intel_de_read(dev_priv, BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
593 if (DISPLAY_VER(dev_priv) < 4)
594 val >>= 1;
595
596 if (panel->backlight.combination_mode) {
597 u8 lbpc;
598
599 pci_read_config_byte(to_pci_dev(dev_priv->drm.dev), LBPC, &lbpc);
600 val *= lbpc;
601 }
602
603 return val;
604 }
605
vlv_get_backlight(struct intel_connector * connector,enum pipe pipe)606 static u32 vlv_get_backlight(struct intel_connector *connector, enum pipe pipe)
607 {
608 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
609
610 if (drm_WARN_ON(&dev_priv->drm, pipe != PIPE_A && pipe != PIPE_B))
611 return 0;
612
613 return intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
614 }
615
bxt_get_backlight(struct intel_connector * connector,enum pipe unused)616 static u32 bxt_get_backlight(struct intel_connector *connector, enum pipe unused)
617 {
618 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
619 struct intel_panel *panel = &connector->panel;
620
621 return intel_de_read(dev_priv,
622 BXT_BLC_PWM_DUTY(panel->backlight.controller));
623 }
624
ext_pwm_get_backlight(struct intel_connector * connector,enum pipe unused)625 static u32 ext_pwm_get_backlight(struct intel_connector *connector, enum pipe unused)
626 {
627 struct intel_panel *panel = &connector->panel;
628 struct pwm_state state;
629
630 pwm_get_state(panel->backlight.pwm, &state);
631 return pwm_get_relative_duty_cycle(&state, 100);
632 }
633
lpt_set_backlight(const struct drm_connector_state * conn_state,u32 level)634 static void lpt_set_backlight(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 *dev_priv = to_i915(connector->base.dev);
638
639 u32 val = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
640 intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, val | level);
641 }
642
pch_set_backlight(const struct drm_connector_state * conn_state,u32 level)643 static void pch_set_backlight(const struct drm_connector_state *conn_state, u32 level)
644 {
645 struct intel_connector *connector = to_intel_connector(conn_state->connector);
646 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
647 u32 tmp;
648
649 tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
650 intel_de_write(dev_priv, BLC_PWM_CPU_CTL, tmp | level);
651 }
652
i9xx_set_backlight(const struct drm_connector_state * conn_state,u32 level)653 static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32 level)
654 {
655 struct intel_connector *connector = to_intel_connector(conn_state->connector);
656 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
657 struct intel_panel *panel = &connector->panel;
658 u32 tmp, mask;
659
660 drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_level_max == 0);
661
662 if (panel->backlight.combination_mode) {
663 u8 lbpc;
664
665 lbpc = level * 0xfe / panel->backlight.pwm_level_max + 1;
666 level /= lbpc;
667 pci_write_config_byte(to_pci_dev(dev_priv->drm.dev), LBPC, lbpc);
668 }
669
670 if (IS_DISPLAY_VER(dev_priv, 4)) {
671 mask = BACKLIGHT_DUTY_CYCLE_MASK;
672 } else {
673 level <<= 1;
674 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
675 }
676
677 tmp = intel_de_read(dev_priv, BLC_PWM_CTL) & ~mask;
678 intel_de_write(dev_priv, BLC_PWM_CTL, tmp | level);
679 }
680
vlv_set_backlight(const struct drm_connector_state * conn_state,u32 level)681 static void vlv_set_backlight(const struct drm_connector_state *conn_state, u32 level)
682 {
683 struct intel_connector *connector = to_intel_connector(conn_state->connector);
684 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
685 enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
686 u32 tmp;
687
688 tmp = intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
689 intel_de_write(dev_priv, VLV_BLC_PWM_CTL(pipe), tmp | level);
690 }
691
bxt_set_backlight(const struct drm_connector_state * conn_state,u32 level)692 static void bxt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
693 {
694 struct intel_connector *connector = to_intel_connector(conn_state->connector);
695 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
696 struct intel_panel *panel = &connector->panel;
697
698 intel_de_write(dev_priv,
699 BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
700 }
701
ext_pwm_set_backlight(const struct drm_connector_state * conn_state,u32 level)702 static void ext_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
703 {
704 struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
705
706 pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
707 pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
708 }
709
710 static void
intel_panel_actually_set_backlight(const struct drm_connector_state * conn_state,u32 level)711 intel_panel_actually_set_backlight(const struct drm_connector_state *conn_state, u32 level)
712 {
713 struct intel_connector *connector = to_intel_connector(conn_state->connector);
714 struct drm_i915_private *i915 = to_i915(connector->base.dev);
715 struct intel_panel *panel = &connector->panel;
716
717 drm_dbg_kms(&i915->drm, "set backlight level = %d\n", level);
718
719 panel->backlight.funcs->set(conn_state, level);
720 }
721
722 /* set backlight brightness to level in range [0..max], assuming hw min is
723 * respected.
724 */
intel_panel_set_backlight_acpi(const struct drm_connector_state * conn_state,u32 user_level,u32 user_max)725 void intel_panel_set_backlight_acpi(const struct drm_connector_state *conn_state,
726 u32 user_level, u32 user_max)
727 {
728 struct intel_connector *connector = to_intel_connector(conn_state->connector);
729 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
730 struct intel_panel *panel = &connector->panel;
731 u32 hw_level;
732
733 /*
734 * Lack of crtc may occur during driver init because
735 * connection_mutex isn't held across the entire backlight
736 * setup + modeset readout, and the BIOS can issue the
737 * requests at any time.
738 */
739 if (!panel->backlight.present || !conn_state->crtc)
740 return;
741
742 mutex_lock(&dev_priv->backlight_lock);
743
744 drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
745
746 hw_level = clamp_user_to_hw(connector, user_level, user_max);
747 panel->backlight.level = hw_level;
748
749 if (panel->backlight.device)
750 panel->backlight.device->props.brightness =
751 scale_hw_to_user(connector,
752 panel->backlight.level,
753 panel->backlight.device->props.max_brightness);
754
755 if (panel->backlight.enabled)
756 intel_panel_actually_set_backlight(conn_state, hw_level);
757
758 mutex_unlock(&dev_priv->backlight_lock);
759 }
760
lpt_disable_backlight(const struct drm_connector_state * old_conn_state,u32 level)761 static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
762 {
763 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
764 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
765 u32 tmp;
766
767 intel_panel_set_pwm_level(old_conn_state, level);
768
769 /*
770 * Although we don't support or enable CPU PWM with LPT/SPT based
771 * systems, it may have been enabled prior to loading the
772 * driver. Disable to avoid warnings on LCPLL disable.
773 *
774 * This needs rework if we need to add support for CPU PWM on PCH split
775 * platforms.
776 */
777 tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
778 if (tmp & BLM_PWM_ENABLE) {
779 drm_dbg_kms(&dev_priv->drm,
780 "cpu backlight was enabled, disabling\n");
781 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2,
782 tmp & ~BLM_PWM_ENABLE);
783 }
784
785 tmp = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
786 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
787 }
788
pch_disable_backlight(const struct drm_connector_state * old_conn_state,u32 val)789 static void pch_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
790 {
791 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
792 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
793 u32 tmp;
794
795 intel_panel_set_pwm_level(old_conn_state, val);
796
797 tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
798 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
799
800 tmp = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
801 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
802 }
803
i9xx_disable_backlight(const struct drm_connector_state * old_conn_state,u32 val)804 static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
805 {
806 intel_panel_set_pwm_level(old_conn_state, val);
807 }
808
i965_disable_backlight(const struct drm_connector_state * old_conn_state,u32 val)809 static void i965_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
810 {
811 struct drm_i915_private *dev_priv = to_i915(old_conn_state->connector->dev);
812 u32 tmp;
813
814 intel_panel_set_pwm_level(old_conn_state, val);
815
816 tmp = intel_de_read(dev_priv, BLC_PWM_CTL2);
817 intel_de_write(dev_priv, BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
818 }
819
vlv_disable_backlight(const struct drm_connector_state * old_conn_state,u32 val)820 static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
821 {
822 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
823 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
824 enum pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe;
825 u32 tmp;
826
827 intel_panel_set_pwm_level(old_conn_state, val);
828
829 tmp = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
830 intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe),
831 tmp & ~BLM_PWM_ENABLE);
832 }
833
bxt_disable_backlight(const struct drm_connector_state * old_conn_state,u32 val)834 static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
835 {
836 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
837 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
838 struct intel_panel *panel = &connector->panel;
839 u32 tmp;
840
841 intel_panel_set_pwm_level(old_conn_state, val);
842
843 tmp = intel_de_read(dev_priv,
844 BXT_BLC_PWM_CTL(panel->backlight.controller));
845 intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
846 tmp & ~BXT_BLC_PWM_ENABLE);
847
848 if (panel->backlight.controller == 1) {
849 val = intel_de_read(dev_priv, UTIL_PIN_CTL);
850 val &= ~UTIL_PIN_ENABLE;
851 intel_de_write(dev_priv, UTIL_PIN_CTL, val);
852 }
853 }
854
cnp_disable_backlight(const struct drm_connector_state * old_conn_state,u32 val)855 static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
856 {
857 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
858 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
859 struct intel_panel *panel = &connector->panel;
860 u32 tmp;
861
862 intel_panel_set_pwm_level(old_conn_state, val);
863
864 tmp = intel_de_read(dev_priv,
865 BXT_BLC_PWM_CTL(panel->backlight.controller));
866 intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
867 tmp & ~BXT_BLC_PWM_ENABLE);
868 }
869
ext_pwm_disable_backlight(const struct drm_connector_state * old_conn_state,u32 level)870 static void ext_pwm_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
871 {
872 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
873 struct intel_panel *panel = &connector->panel;
874
875 panel->backlight.pwm_state.enabled = false;
876 pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
877 }
878
intel_panel_disable_backlight(const struct drm_connector_state * old_conn_state)879 void intel_panel_disable_backlight(const struct drm_connector_state *old_conn_state)
880 {
881 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
882 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
883 struct intel_panel *panel = &connector->panel;
884
885 if (!panel->backlight.present)
886 return;
887
888 /*
889 * Do not disable backlight on the vga_switcheroo path. When switching
890 * away from i915, the other client may depend on i915 to handle the
891 * backlight. This will leave the backlight on unnecessarily when
892 * another client is not activated.
893 */
894 if (dev_priv->drm.switch_power_state == DRM_SWITCH_POWER_CHANGING) {
895 drm_dbg_kms(&dev_priv->drm,
896 "Skipping backlight disable on vga switch\n");
897 return;
898 }
899
900 mutex_lock(&dev_priv->backlight_lock);
901
902 if (panel->backlight.device)
903 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
904 panel->backlight.enabled = false;
905 panel->backlight.funcs->disable(old_conn_state, 0);
906
907 mutex_unlock(&dev_priv->backlight_lock);
908 }
909
lpt_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)910 static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,
911 const struct drm_connector_state *conn_state, u32 level)
912 {
913 struct intel_connector *connector = to_intel_connector(conn_state->connector);
914 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
915 struct intel_panel *panel = &connector->panel;
916 u32 pch_ctl1, pch_ctl2, schicken;
917
918 pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
919 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
920 drm_dbg_kms(&dev_priv->drm, "pch backlight already enabled\n");
921 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
922 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
923 }
924
925 if (HAS_PCH_LPT(dev_priv)) {
926 schicken = intel_de_read(dev_priv, SOUTH_CHICKEN2);
927 if (panel->backlight.alternate_pwm_increment)
928 schicken |= LPT_PWM_GRANULARITY;
929 else
930 schicken &= ~LPT_PWM_GRANULARITY;
931 intel_de_write(dev_priv, SOUTH_CHICKEN2, schicken);
932 } else {
933 schicken = intel_de_read(dev_priv, SOUTH_CHICKEN1);
934 if (panel->backlight.alternate_pwm_increment)
935 schicken |= SPT_PWM_GRANULARITY;
936 else
937 schicken &= ~SPT_PWM_GRANULARITY;
938 intel_de_write(dev_priv, SOUTH_CHICKEN1, schicken);
939 }
940
941 pch_ctl2 = panel->backlight.pwm_level_max << 16;
942 intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, pch_ctl2);
943
944 pch_ctl1 = 0;
945 if (panel->backlight.active_low_pwm)
946 pch_ctl1 |= BLM_PCH_POLARITY;
947
948 /* After LPT, override is the default. */
949 if (HAS_PCH_LPT(dev_priv))
950 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
951
952 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
953 intel_de_posting_read(dev_priv, BLC_PWM_PCH_CTL1);
954 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
955 pch_ctl1 | BLM_PCH_PWM_ENABLE);
956
957 /* This won't stick until the above enable. */
958 intel_panel_set_pwm_level(conn_state, level);
959 }
960
pch_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)961 static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
962 const struct drm_connector_state *conn_state, u32 level)
963 {
964 struct intel_connector *connector = to_intel_connector(conn_state->connector);
965 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
966 struct intel_panel *panel = &connector->panel;
967 enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
968 u32 cpu_ctl2, pch_ctl1, pch_ctl2;
969
970 cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
971 if (cpu_ctl2 & BLM_PWM_ENABLE) {
972 drm_dbg_kms(&dev_priv->drm, "cpu backlight already enabled\n");
973 cpu_ctl2 &= ~BLM_PWM_ENABLE;
974 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2);
975 }
976
977 pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
978 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
979 drm_dbg_kms(&dev_priv->drm, "pch backlight already enabled\n");
980 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
981 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
982 }
983
984 if (cpu_transcoder == TRANSCODER_EDP)
985 cpu_ctl2 = BLM_TRANSCODER_EDP;
986 else
987 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
988 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2);
989 intel_de_posting_read(dev_priv, BLC_PWM_CPU_CTL2);
990 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
991
992 /* This won't stick until the above enable. */
993 intel_panel_set_pwm_level(conn_state, level);
994
995 pch_ctl2 = panel->backlight.pwm_level_max << 16;
996 intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, pch_ctl2);
997
998 pch_ctl1 = 0;
999 if (panel->backlight.active_low_pwm)
1000 pch_ctl1 |= BLM_PCH_POLARITY;
1001
1002 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
1003 intel_de_posting_read(dev_priv, BLC_PWM_PCH_CTL1);
1004 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
1005 pch_ctl1 | BLM_PCH_PWM_ENABLE);
1006 }
1007
i9xx_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)1008 static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
1009 const struct drm_connector_state *conn_state, u32 level)
1010 {
1011 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1012 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1013 struct intel_panel *panel = &connector->panel;
1014 u32 ctl, freq;
1015
1016 ctl = intel_de_read(dev_priv, BLC_PWM_CTL);
1017 if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
1018 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
1019 intel_de_write(dev_priv, BLC_PWM_CTL, 0);
1020 }
1021
1022 freq = panel->backlight.pwm_level_max;
1023 if (panel->backlight.combination_mode)
1024 freq /= 0xff;
1025
1026 ctl = freq << 17;
1027 if (panel->backlight.combination_mode)
1028 ctl |= BLM_LEGACY_MODE;
1029 if (IS_PINEVIEW(dev_priv) && panel->backlight.active_low_pwm)
1030 ctl |= BLM_POLARITY_PNV;
1031
1032 intel_de_write(dev_priv, BLC_PWM_CTL, ctl);
1033 intel_de_posting_read(dev_priv, BLC_PWM_CTL);
1034
1035 /* XXX: combine this into above write? */
1036 intel_panel_set_pwm_level(conn_state, level);
1037
1038 /*
1039 * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
1040 * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
1041 * that has backlight.
1042 */
1043 if (IS_DISPLAY_VER(dev_priv, 2))
1044 intel_de_write(dev_priv, BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
1045 }
1046
i965_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)1047 static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,
1048 const struct drm_connector_state *conn_state, u32 level)
1049 {
1050 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1051 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1052 struct intel_panel *panel = &connector->panel;
1053 enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
1054 u32 ctl, ctl2, freq;
1055
1056 ctl2 = intel_de_read(dev_priv, BLC_PWM_CTL2);
1057 if (ctl2 & BLM_PWM_ENABLE) {
1058 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
1059 ctl2 &= ~BLM_PWM_ENABLE;
1060 intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2);
1061 }
1062
1063 freq = panel->backlight.pwm_level_max;
1064 if (panel->backlight.combination_mode)
1065 freq /= 0xff;
1066
1067 ctl = freq << 16;
1068 intel_de_write(dev_priv, BLC_PWM_CTL, ctl);
1069
1070 ctl2 = BLM_PIPE(pipe);
1071 if (panel->backlight.combination_mode)
1072 ctl2 |= BLM_COMBINATION_MODE;
1073 if (panel->backlight.active_low_pwm)
1074 ctl2 |= BLM_POLARITY_I965;
1075 intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2);
1076 intel_de_posting_read(dev_priv, BLC_PWM_CTL2);
1077 intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
1078
1079 intel_panel_set_pwm_level(conn_state, level);
1080 }
1081
vlv_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)1082 static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
1083 const struct drm_connector_state *conn_state, u32 level)
1084 {
1085 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1086 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1087 struct intel_panel *panel = &connector->panel;
1088 enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
1089 u32 ctl, ctl2;
1090
1091 ctl2 = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
1092 if (ctl2 & BLM_PWM_ENABLE) {
1093 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
1094 ctl2 &= ~BLM_PWM_ENABLE;
1095 intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe), ctl2);
1096 }
1097
1098 ctl = panel->backlight.pwm_level_max << 16;
1099 intel_de_write(dev_priv, VLV_BLC_PWM_CTL(pipe), ctl);
1100
1101 /* XXX: combine this into above write? */
1102 intel_panel_set_pwm_level(conn_state, level);
1103
1104 ctl2 = 0;
1105 if (panel->backlight.active_low_pwm)
1106 ctl2 |= BLM_POLARITY_I965;
1107 intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe), ctl2);
1108 intel_de_posting_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
1109 intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe),
1110 ctl2 | BLM_PWM_ENABLE);
1111 }
1112
bxt_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)1113 static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,
1114 const struct drm_connector_state *conn_state, u32 level)
1115 {
1116 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1117 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1118 struct intel_panel *panel = &connector->panel;
1119 enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
1120 u32 pwm_ctl, val;
1121
1122 /* Controller 1 uses the utility pin. */
1123 if (panel->backlight.controller == 1) {
1124 val = intel_de_read(dev_priv, UTIL_PIN_CTL);
1125 if (val & UTIL_PIN_ENABLE) {
1126 drm_dbg_kms(&dev_priv->drm,
1127 "util pin already enabled\n");
1128 val &= ~UTIL_PIN_ENABLE;
1129 intel_de_write(dev_priv, UTIL_PIN_CTL, val);
1130 }
1131
1132 val = 0;
1133 if (panel->backlight.util_pin_active_low)
1134 val |= UTIL_PIN_POLARITY;
1135 intel_de_write(dev_priv, UTIL_PIN_CTL,
1136 val | UTIL_PIN_PIPE(pipe) | UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
1137 }
1138
1139 pwm_ctl = intel_de_read(dev_priv,
1140 BXT_BLC_PWM_CTL(panel->backlight.controller));
1141 if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1142 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
1143 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1144 intel_de_write(dev_priv,
1145 BXT_BLC_PWM_CTL(panel->backlight.controller),
1146 pwm_ctl);
1147 }
1148
1149 intel_de_write(dev_priv,
1150 BXT_BLC_PWM_FREQ(panel->backlight.controller),
1151 panel->backlight.pwm_level_max);
1152
1153 intel_panel_set_pwm_level(conn_state, level);
1154
1155 pwm_ctl = 0;
1156 if (panel->backlight.active_low_pwm)
1157 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1158
1159 intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
1160 pwm_ctl);
1161 intel_de_posting_read(dev_priv,
1162 BXT_BLC_PWM_CTL(panel->backlight.controller));
1163 intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
1164 pwm_ctl | BXT_BLC_PWM_ENABLE);
1165 }
1166
cnp_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)1167 static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,
1168 const struct drm_connector_state *conn_state, u32 level)
1169 {
1170 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1171 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1172 struct intel_panel *panel = &connector->panel;
1173 u32 pwm_ctl;
1174
1175 pwm_ctl = intel_de_read(dev_priv,
1176 BXT_BLC_PWM_CTL(panel->backlight.controller));
1177 if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1178 drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
1179 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1180 intel_de_write(dev_priv,
1181 BXT_BLC_PWM_CTL(panel->backlight.controller),
1182 pwm_ctl);
1183 }
1184
1185 intel_de_write(dev_priv,
1186 BXT_BLC_PWM_FREQ(panel->backlight.controller),
1187 panel->backlight.pwm_level_max);
1188
1189 intel_panel_set_pwm_level(conn_state, level);
1190
1191 pwm_ctl = 0;
1192 if (panel->backlight.active_low_pwm)
1193 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1194
1195 intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
1196 pwm_ctl);
1197 intel_de_posting_read(dev_priv,
1198 BXT_BLC_PWM_CTL(panel->backlight.controller));
1199 intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
1200 pwm_ctl | BXT_BLC_PWM_ENABLE);
1201 }
1202
ext_pwm_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)1203 static void ext_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
1204 const struct drm_connector_state *conn_state, u32 level)
1205 {
1206 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1207 struct intel_panel *panel = &connector->panel;
1208
1209 pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
1210 panel->backlight.pwm_state.enabled = true;
1211 pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
1212 }
1213
__intel_panel_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state)1214 static void __intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
1215 const struct drm_connector_state *conn_state)
1216 {
1217 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1218 struct intel_panel *panel = &connector->panel;
1219
1220 WARN_ON(panel->backlight.max == 0);
1221
1222 if (panel->backlight.level <= panel->backlight.min) {
1223 panel->backlight.level = panel->backlight.max;
1224 if (panel->backlight.device)
1225 panel->backlight.device->props.brightness =
1226 scale_hw_to_user(connector,
1227 panel->backlight.level,
1228 panel->backlight.device->props.max_brightness);
1229 }
1230
1231 panel->backlight.funcs->enable(crtc_state, conn_state, panel->backlight.level);
1232 panel->backlight.enabled = true;
1233 if (panel->backlight.device)
1234 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
1235 }
1236
intel_panel_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state)1237 void intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
1238 const struct drm_connector_state *conn_state)
1239 {
1240 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1241 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1242 struct intel_panel *panel = &connector->panel;
1243 enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
1244
1245 if (!panel->backlight.present)
1246 return;
1247
1248 drm_dbg_kms(&dev_priv->drm, "pipe %c\n", pipe_name(pipe));
1249
1250 mutex_lock(&dev_priv->backlight_lock);
1251
1252 __intel_panel_enable_backlight(crtc_state, conn_state);
1253
1254 mutex_unlock(&dev_priv->backlight_lock);
1255 }
1256
1257 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
intel_panel_get_backlight(struct intel_connector * connector)1258 static u32 intel_panel_get_backlight(struct intel_connector *connector)
1259 {
1260 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1261 struct intel_panel *panel = &connector->panel;
1262 u32 val = 0;
1263
1264 mutex_lock(&dev_priv->backlight_lock);
1265
1266 if (panel->backlight.enabled)
1267 val = panel->backlight.funcs->get(connector, intel_connector_get_pipe(connector));
1268
1269 mutex_unlock(&dev_priv->backlight_lock);
1270
1271 drm_dbg_kms(&dev_priv->drm, "get backlight PWM = %d\n", val);
1272 return val;
1273 }
1274
1275 /* 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)1276 static u32 scale_user_to_hw(struct intel_connector *connector,
1277 u32 user_level, u32 user_max)
1278 {
1279 struct intel_panel *panel = &connector->panel;
1280
1281 return scale(user_level, 0, user_max,
1282 panel->backlight.min, panel->backlight.max);
1283 }
1284
1285 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
intel_panel_set_backlight(const struct drm_connector_state * conn_state,u32 user_level,u32 user_max)1286 static void intel_panel_set_backlight(const struct drm_connector_state *conn_state,
1287 u32 user_level, u32 user_max)
1288 {
1289 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1290 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1291 struct intel_panel *panel = &connector->panel;
1292 u32 hw_level;
1293
1294 if (!panel->backlight.present)
1295 return;
1296
1297 mutex_lock(&dev_priv->backlight_lock);
1298
1299 drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
1300
1301 hw_level = scale_user_to_hw(connector, user_level, user_max);
1302 panel->backlight.level = hw_level;
1303
1304 if (panel->backlight.enabled)
1305 intel_panel_actually_set_backlight(conn_state, hw_level);
1306
1307 mutex_unlock(&dev_priv->backlight_lock);
1308 }
1309
intel_backlight_device_update_status(struct backlight_device * bd)1310 static int intel_backlight_device_update_status(struct backlight_device *bd)
1311 {
1312 struct intel_connector *connector = bl_get_data(bd);
1313 struct intel_panel *panel = &connector->panel;
1314 struct drm_device *dev = connector->base.dev;
1315
1316 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1317 DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1318 bd->props.brightness, bd->props.max_brightness);
1319 intel_panel_set_backlight(connector->base.state, bd->props.brightness,
1320 bd->props.max_brightness);
1321
1322 /*
1323 * Allow flipping bl_power as a sub-state of enabled. Sadly the
1324 * backlight class device does not make it easy to to differentiate
1325 * between callbacks for brightness and bl_power, so our backlight_power
1326 * callback needs to take this into account.
1327 */
1328 if (panel->backlight.enabled) {
1329 if (panel->backlight.power) {
1330 bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1331 bd->props.brightness != 0;
1332 panel->backlight.power(connector, enable);
1333 }
1334 } else {
1335 bd->props.power = FB_BLANK_POWERDOWN;
1336 }
1337
1338 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1339 return 0;
1340 }
1341
intel_backlight_device_get_brightness(struct backlight_device * bd)1342 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1343 {
1344 struct intel_connector *connector = bl_get_data(bd);
1345 struct drm_device *dev = connector->base.dev;
1346 struct drm_i915_private *dev_priv = to_i915(dev);
1347 intel_wakeref_t wakeref;
1348 int ret = 0;
1349
1350 with_intel_runtime_pm(&dev_priv->runtime_pm, wakeref) {
1351 u32 hw_level;
1352
1353 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1354
1355 hw_level = intel_panel_get_backlight(connector);
1356 ret = scale_hw_to_user(connector,
1357 hw_level, bd->props.max_brightness);
1358
1359 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1360 }
1361
1362 return ret;
1363 }
1364
1365 static const struct backlight_ops intel_backlight_device_ops = {
1366 .update_status = intel_backlight_device_update_status,
1367 .get_brightness = intel_backlight_device_get_brightness,
1368 };
1369
intel_backlight_device_register(struct intel_connector * connector)1370 int intel_backlight_device_register(struct intel_connector *connector)
1371 {
1372 struct drm_i915_private *i915 = to_i915(connector->base.dev);
1373 struct intel_panel *panel = &connector->panel;
1374 struct backlight_properties props;
1375
1376 if (WARN_ON(panel->backlight.device))
1377 return -ENODEV;
1378
1379 if (!panel->backlight.present)
1380 return 0;
1381
1382 WARN_ON(panel->backlight.max == 0);
1383
1384 memset(&props, 0, sizeof(props));
1385 props.type = BACKLIGHT_RAW;
1386
1387 /*
1388 * Note: Everything should work even if the backlight device max
1389 * presented to the userspace is arbitrarily chosen.
1390 */
1391 props.max_brightness = panel->backlight.max;
1392 props.brightness = scale_hw_to_user(connector,
1393 panel->backlight.level,
1394 props.max_brightness);
1395
1396 if (panel->backlight.enabled)
1397 props.power = FB_BLANK_UNBLANK;
1398 else
1399 props.power = FB_BLANK_POWERDOWN;
1400
1401 /*
1402 * Note: using the same name independent of the connector prevents
1403 * registration of multiple backlight devices in the driver.
1404 */
1405 panel->backlight.device =
1406 backlight_device_register("intel_backlight",
1407 connector->base.kdev,
1408 connector,
1409 &intel_backlight_device_ops, &props);
1410
1411 if (IS_ERR(panel->backlight.device)) {
1412 drm_err(&i915->drm, "Failed to register backlight: %ld\n",
1413 PTR_ERR(panel->backlight.device));
1414 panel->backlight.device = NULL;
1415 return -ENODEV;
1416 }
1417
1418 drm_dbg_kms(&i915->drm,
1419 "Connector %s backlight sysfs interface registered\n",
1420 connector->base.name);
1421
1422 return 0;
1423 }
1424
intel_backlight_device_unregister(struct intel_connector * connector)1425 void intel_backlight_device_unregister(struct intel_connector *connector)
1426 {
1427 struct intel_panel *panel = &connector->panel;
1428
1429 if (panel->backlight.device) {
1430 backlight_device_unregister(panel->backlight.device);
1431 panel->backlight.device = NULL;
1432 }
1433 }
1434 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1435
1436 /*
1437 * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
1438 * PWM increment = 1
1439 */
cnp_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1440 static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1441 {
1442 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1443
1444 return DIV_ROUND_CLOSEST(KHz(RUNTIME_INFO(dev_priv)->rawclk_freq),
1445 pwm_freq_hz);
1446 }
1447
1448 /*
1449 * BXT: PWM clock frequency = 19.2 MHz.
1450 */
bxt_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1451 static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1452 {
1453 return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz);
1454 }
1455
1456 /*
1457 * SPT: This value represents the period of the PWM stream in clock periods
1458 * multiplied by 16 (default increment) or 128 (alternate increment selected in
1459 * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1460 */
spt_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1461 static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1462 {
1463 struct intel_panel *panel = &connector->panel;
1464 u32 mul;
1465
1466 if (panel->backlight.alternate_pwm_increment)
1467 mul = 128;
1468 else
1469 mul = 16;
1470
1471 return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz * mul);
1472 }
1473
1474 /*
1475 * LPT: This value represents the period of the PWM stream in clock periods
1476 * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1477 * LPT SOUTH_CHICKEN2 register bit 5).
1478 */
lpt_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1479 static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1480 {
1481 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1482 struct intel_panel *panel = &connector->panel;
1483 u32 mul, clock;
1484
1485 if (panel->backlight.alternate_pwm_increment)
1486 mul = 16;
1487 else
1488 mul = 128;
1489
1490 if (HAS_PCH_LPT_H(dev_priv))
1491 clock = MHz(135); /* LPT:H */
1492 else
1493 clock = MHz(24); /* LPT:LP */
1494
1495 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1496 }
1497
1498 /*
1499 * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1500 * display raw clocks multiplied by 128.
1501 */
pch_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1502 static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1503 {
1504 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1505
1506 return DIV_ROUND_CLOSEST(KHz(RUNTIME_INFO(dev_priv)->rawclk_freq),
1507 pwm_freq_hz * 128);
1508 }
1509
1510 /*
1511 * Gen2: This field determines the number of time base events (display core
1512 * clock frequency/32) in total for a complete cycle of modulated backlight
1513 * control.
1514 *
1515 * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1516 * divided by 32.
1517 */
i9xx_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1518 static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1519 {
1520 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1521 int clock;
1522
1523 if (IS_PINEVIEW(dev_priv))
1524 clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
1525 else
1526 clock = KHz(dev_priv->cdclk.hw.cdclk);
1527
1528 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 32);
1529 }
1530
1531 /*
1532 * Gen4: This value represents the period of the PWM stream in display core
1533 * clocks ([DevCTG] HRAW clocks) multiplied by 128.
1534 *
1535 */
i965_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1536 static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1537 {
1538 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1539 int clock;
1540
1541 if (IS_G4X(dev_priv))
1542 clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
1543 else
1544 clock = KHz(dev_priv->cdclk.hw.cdclk);
1545
1546 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 128);
1547 }
1548
1549 /*
1550 * VLV: This value represents the period of the PWM stream in display core
1551 * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1552 * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1553 */
vlv_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1554 static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1555 {
1556 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1557 int mul, clock;
1558
1559 if ((intel_de_read(dev_priv, CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
1560 if (IS_CHERRYVIEW(dev_priv))
1561 clock = KHz(19200);
1562 else
1563 clock = MHz(25);
1564 mul = 16;
1565 } else {
1566 clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
1567 mul = 128;
1568 }
1569
1570 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1571 }
1572
get_vbt_pwm_freq(struct drm_i915_private * dev_priv)1573 static u16 get_vbt_pwm_freq(struct drm_i915_private *dev_priv)
1574 {
1575 u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
1576
1577 if (pwm_freq_hz) {
1578 drm_dbg_kms(&dev_priv->drm,
1579 "VBT defined backlight frequency %u Hz\n",
1580 pwm_freq_hz);
1581 } else {
1582 pwm_freq_hz = 200;
1583 drm_dbg_kms(&dev_priv->drm,
1584 "default backlight frequency %u Hz\n",
1585 pwm_freq_hz);
1586 }
1587
1588 return pwm_freq_hz;
1589 }
1590
get_backlight_max_vbt(struct intel_connector * connector)1591 static u32 get_backlight_max_vbt(struct intel_connector *connector)
1592 {
1593 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1594 struct intel_panel *panel = &connector->panel;
1595 u16 pwm_freq_hz = get_vbt_pwm_freq(dev_priv);
1596 u32 pwm;
1597
1598 if (!panel->backlight.pwm_funcs->hz_to_pwm) {
1599 drm_dbg_kms(&dev_priv->drm,
1600 "backlight frequency conversion not supported\n");
1601 return 0;
1602 }
1603
1604 pwm = panel->backlight.pwm_funcs->hz_to_pwm(connector, pwm_freq_hz);
1605 if (!pwm) {
1606 drm_dbg_kms(&dev_priv->drm,
1607 "backlight frequency conversion failed\n");
1608 return 0;
1609 }
1610
1611 return pwm;
1612 }
1613
1614 /*
1615 * Note: The setup hooks can't assume pipe is set!
1616 */
get_backlight_min_vbt(struct intel_connector * connector)1617 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1618 {
1619 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1620 struct intel_panel *panel = &connector->panel;
1621 int min;
1622
1623 drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_level_max == 0);
1624
1625 /*
1626 * XXX: If the vbt value is 255, it makes min equal to max, which leads
1627 * to problems. There are such machines out there. Either our
1628 * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1629 * against this by letting the minimum be at most (arbitrarily chosen)
1630 * 25% of the max.
1631 */
1632 min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1633 if (min != dev_priv->vbt.backlight.min_brightness) {
1634 drm_dbg_kms(&dev_priv->drm,
1635 "clamping VBT min backlight %d/255 to %d/255\n",
1636 dev_priv->vbt.backlight.min_brightness, min);
1637 }
1638
1639 /* vbt value is a coefficient in range [0..255] */
1640 return scale(min, 0, 255, 0, panel->backlight.pwm_level_max);
1641 }
1642
lpt_setup_backlight(struct intel_connector * connector,enum pipe unused)1643 static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1644 {
1645 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1646 struct intel_panel *panel = &connector->panel;
1647 u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1648 bool alt, cpu_mode;
1649
1650 if (HAS_PCH_LPT(dev_priv))
1651 alt = intel_de_read(dev_priv, SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY;
1652 else
1653 alt = intel_de_read(dev_priv, SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;
1654 panel->backlight.alternate_pwm_increment = alt;
1655
1656 pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
1657 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1658
1659 pch_ctl2 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2);
1660 panel->backlight.pwm_level_max = pch_ctl2 >> 16;
1661
1662 cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
1663
1664 if (!panel->backlight.pwm_level_max)
1665 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1666
1667 if (!panel->backlight.pwm_level_max)
1668 return -ENODEV;
1669
1670 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1671
1672 panel->backlight.pwm_enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;
1673
1674 cpu_mode = panel->backlight.pwm_enabled && HAS_PCH_LPT(dev_priv) &&
1675 !(pch_ctl1 & BLM_PCH_OVERRIDE_ENABLE) &&
1676 (cpu_ctl2 & BLM_PWM_ENABLE);
1677
1678 if (cpu_mode) {
1679 val = pch_get_backlight(connector, unused);
1680
1681 drm_dbg_kms(&dev_priv->drm,
1682 "CPU backlight register was enabled, switching to PCH override\n");
1683
1684 /* Write converted CPU PWM value to PCH override register */
1685 lpt_set_backlight(connector->base.state, val);
1686 intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
1687 pch_ctl1 | BLM_PCH_OVERRIDE_ENABLE);
1688
1689 intel_de_write(dev_priv, BLC_PWM_CPU_CTL2,
1690 cpu_ctl2 & ~BLM_PWM_ENABLE);
1691 }
1692
1693 return 0;
1694 }
1695
pch_setup_backlight(struct intel_connector * connector,enum pipe unused)1696 static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
1697 {
1698 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1699 struct intel_panel *panel = &connector->panel;
1700 u32 cpu_ctl2, pch_ctl1, pch_ctl2;
1701
1702 pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
1703 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1704
1705 pch_ctl2 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2);
1706 panel->backlight.pwm_level_max = pch_ctl2 >> 16;
1707
1708 if (!panel->backlight.pwm_level_max)
1709 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1710
1711 if (!panel->backlight.pwm_level_max)
1712 return -ENODEV;
1713
1714 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1715
1716 cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
1717 panel->backlight.pwm_enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1718 (pch_ctl1 & BLM_PCH_PWM_ENABLE);
1719
1720 return 0;
1721 }
1722
i9xx_setup_backlight(struct intel_connector * connector,enum pipe unused)1723 static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
1724 {
1725 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1726 struct intel_panel *panel = &connector->panel;
1727 u32 ctl, val;
1728
1729 ctl = intel_de_read(dev_priv, BLC_PWM_CTL);
1730
1731 if (IS_DISPLAY_VER(dev_priv, 2) || IS_I915GM(dev_priv) || IS_I945GM(dev_priv))
1732 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1733
1734 if (IS_PINEVIEW(dev_priv))
1735 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1736
1737 panel->backlight.pwm_level_max = ctl >> 17;
1738
1739 if (!panel->backlight.pwm_level_max) {
1740 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1741 panel->backlight.pwm_level_max >>= 1;
1742 }
1743
1744 if (!panel->backlight.pwm_level_max)
1745 return -ENODEV;
1746
1747 if (panel->backlight.combination_mode)
1748 panel->backlight.pwm_level_max *= 0xff;
1749
1750 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1751
1752 val = i9xx_get_backlight(connector, unused);
1753 val = intel_panel_invert_pwm_level(connector, val);
1754 val = clamp(val, panel->backlight.pwm_level_min, panel->backlight.pwm_level_max);
1755
1756 panel->backlight.pwm_enabled = val != 0;
1757
1758 return 0;
1759 }
1760
i965_setup_backlight(struct intel_connector * connector,enum pipe unused)1761 static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
1762 {
1763 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1764 struct intel_panel *panel = &connector->panel;
1765 u32 ctl, ctl2;
1766
1767 ctl2 = intel_de_read(dev_priv, BLC_PWM_CTL2);
1768 panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1769 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1770
1771 ctl = intel_de_read(dev_priv, BLC_PWM_CTL);
1772 panel->backlight.pwm_level_max = ctl >> 16;
1773
1774 if (!panel->backlight.pwm_level_max)
1775 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1776
1777 if (!panel->backlight.pwm_level_max)
1778 return -ENODEV;
1779
1780 if (panel->backlight.combination_mode)
1781 panel->backlight.pwm_level_max *= 0xff;
1782
1783 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1784
1785 panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE;
1786
1787 return 0;
1788 }
1789
vlv_setup_backlight(struct intel_connector * connector,enum pipe pipe)1790 static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1791 {
1792 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1793 struct intel_panel *panel = &connector->panel;
1794 u32 ctl, ctl2;
1795
1796 if (drm_WARN_ON(&dev_priv->drm, pipe != PIPE_A && pipe != PIPE_B))
1797 return -ENODEV;
1798
1799 ctl2 = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
1800 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1801
1802 ctl = intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe));
1803 panel->backlight.pwm_level_max = ctl >> 16;
1804
1805 if (!panel->backlight.pwm_level_max)
1806 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1807
1808 if (!panel->backlight.pwm_level_max)
1809 return -ENODEV;
1810
1811 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1812
1813 panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE;
1814
1815 return 0;
1816 }
1817
1818 static int
bxt_setup_backlight(struct intel_connector * connector,enum pipe unused)1819 bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
1820 {
1821 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1822 struct intel_panel *panel = &connector->panel;
1823 u32 pwm_ctl, val;
1824
1825 panel->backlight.controller = dev_priv->vbt.backlight.controller;
1826
1827 pwm_ctl = intel_de_read(dev_priv,
1828 BXT_BLC_PWM_CTL(panel->backlight.controller));
1829
1830 /* Controller 1 uses the utility pin. */
1831 if (panel->backlight.controller == 1) {
1832 val = intel_de_read(dev_priv, UTIL_PIN_CTL);
1833 panel->backlight.util_pin_active_low =
1834 val & UTIL_PIN_POLARITY;
1835 }
1836
1837 panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1838 panel->backlight.pwm_level_max =
1839 intel_de_read(dev_priv, BXT_BLC_PWM_FREQ(panel->backlight.controller));
1840
1841 if (!panel->backlight.pwm_level_max)
1842 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1843
1844 if (!panel->backlight.pwm_level_max)
1845 return -ENODEV;
1846
1847 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1848
1849 panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1850
1851 return 0;
1852 }
1853
1854 static int
cnp_setup_backlight(struct intel_connector * connector,enum pipe unused)1855 cnp_setup_backlight(struct intel_connector *connector, enum pipe unused)
1856 {
1857 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1858 struct intel_panel *panel = &connector->panel;
1859 u32 pwm_ctl;
1860
1861 /*
1862 * CNP has the BXT implementation of backlight, but with only one
1863 * controller. TODO: ICP has multiple controllers but we only use
1864 * controller 0 for now.
1865 */
1866 panel->backlight.controller = 0;
1867
1868 pwm_ctl = intel_de_read(dev_priv,
1869 BXT_BLC_PWM_CTL(panel->backlight.controller));
1870
1871 panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1872 panel->backlight.pwm_level_max =
1873 intel_de_read(dev_priv, BXT_BLC_PWM_FREQ(panel->backlight.controller));
1874
1875 if (!panel->backlight.pwm_level_max)
1876 panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
1877
1878 if (!panel->backlight.pwm_level_max)
1879 return -ENODEV;
1880
1881 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1882
1883 panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1884
1885 return 0;
1886 }
1887
ext_pwm_setup_backlight(struct intel_connector * connector,enum pipe pipe)1888 static int ext_pwm_setup_backlight(struct intel_connector *connector,
1889 enum pipe pipe)
1890 {
1891 struct drm_device *dev = connector->base.dev;
1892 struct drm_i915_private *dev_priv = to_i915(dev);
1893 struct intel_panel *panel = &connector->panel;
1894 const char *desc;
1895 u32 level;
1896
1897 /* Get the right PWM chip for DSI backlight according to VBT */
1898 if (dev_priv->vbt.dsi.config->pwm_blc == PPS_BLC_PMIC) {
1899 panel->backlight.pwm = pwm_get(dev->dev, "pwm_pmic_backlight");
1900 desc = "PMIC";
1901 } else {
1902 panel->backlight.pwm = pwm_get(dev->dev, "pwm_soc_backlight");
1903 desc = "SoC";
1904 }
1905
1906 if (IS_ERR(panel->backlight.pwm)) {
1907 drm_err(&dev_priv->drm, "Failed to get the %s PWM chip\n",
1908 desc);
1909 panel->backlight.pwm = NULL;
1910 return -ENODEV;
1911 }
1912
1913 panel->backlight.pwm_level_max = 100; /* 100% */
1914 panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
1915
1916 if (pwm_is_enabled(panel->backlight.pwm)) {
1917 /* PWM is already enabled, use existing settings */
1918 pwm_get_state(panel->backlight.pwm, &panel->backlight.pwm_state);
1919
1920 level = pwm_get_relative_duty_cycle(&panel->backlight.pwm_state,
1921 100);
1922 level = intel_panel_invert_pwm_level(connector, level);
1923 panel->backlight.pwm_enabled = true;
1924
1925 drm_dbg_kms(&dev_priv->drm, "PWM already enabled at freq %ld, VBT freq %d, level %d\n",
1926 NSEC_PER_SEC / (unsigned long)panel->backlight.pwm_state.period,
1927 get_vbt_pwm_freq(dev_priv), level);
1928 } else {
1929 /* Set period from VBT frequency, leave other settings at 0. */
1930 panel->backlight.pwm_state.period =
1931 NSEC_PER_SEC / get_vbt_pwm_freq(dev_priv);
1932 }
1933
1934 drm_info(&dev_priv->drm, "Using %s PWM for LCD backlight control\n",
1935 desc);
1936 return 0;
1937 }
1938
intel_pwm_set_backlight(const struct drm_connector_state * conn_state,u32 level)1939 static void intel_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
1940 {
1941 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1942 struct intel_panel *panel = &connector->panel;
1943
1944 panel->backlight.pwm_funcs->set(conn_state,
1945 intel_panel_invert_pwm_level(connector, level));
1946 }
1947
intel_pwm_get_backlight(struct intel_connector * connector,enum pipe pipe)1948 static u32 intel_pwm_get_backlight(struct intel_connector *connector, enum pipe pipe)
1949 {
1950 struct intel_panel *panel = &connector->panel;
1951
1952 return intel_panel_invert_pwm_level(connector,
1953 panel->backlight.pwm_funcs->get(connector, pipe));
1954 }
1955
intel_pwm_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state,u32 level)1956 static void intel_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
1957 const struct drm_connector_state *conn_state, u32 level)
1958 {
1959 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1960 struct intel_panel *panel = &connector->panel;
1961
1962 panel->backlight.pwm_funcs->enable(crtc_state, conn_state,
1963 intel_panel_invert_pwm_level(connector, level));
1964 }
1965
intel_pwm_disable_backlight(const struct drm_connector_state * conn_state,u32 level)1966 static void intel_pwm_disable_backlight(const struct drm_connector_state *conn_state, u32 level)
1967 {
1968 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1969 struct intel_panel *panel = &connector->panel;
1970
1971 panel->backlight.pwm_funcs->disable(conn_state,
1972 intel_panel_invert_pwm_level(connector, level));
1973 }
1974
intel_pwm_setup_backlight(struct intel_connector * connector,enum pipe pipe)1975 static int intel_pwm_setup_backlight(struct intel_connector *connector, enum pipe pipe)
1976 {
1977 struct intel_panel *panel = &connector->panel;
1978 int ret = panel->backlight.pwm_funcs->setup(connector, pipe);
1979
1980 if (ret < 0)
1981 return ret;
1982
1983 panel->backlight.min = panel->backlight.pwm_level_min;
1984 panel->backlight.max = panel->backlight.pwm_level_max;
1985 panel->backlight.level = intel_pwm_get_backlight(connector, pipe);
1986 panel->backlight.enabled = panel->backlight.pwm_enabled;
1987
1988 return 0;
1989 }
1990
intel_panel_update_backlight(struct intel_atomic_state * state,struct intel_encoder * encoder,const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state)1991 void intel_panel_update_backlight(struct intel_atomic_state *state,
1992 struct intel_encoder *encoder,
1993 const struct intel_crtc_state *crtc_state,
1994 const struct drm_connector_state *conn_state)
1995 {
1996 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1997 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1998 struct intel_panel *panel = &connector->panel;
1999
2000 if (!panel->backlight.present)
2001 return;
2002
2003 mutex_lock(&dev_priv->backlight_lock);
2004 if (!panel->backlight.enabled)
2005 __intel_panel_enable_backlight(crtc_state, conn_state);
2006
2007 mutex_unlock(&dev_priv->backlight_lock);
2008 }
2009
intel_panel_setup_backlight(struct drm_connector * connector,enum pipe pipe)2010 int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
2011 {
2012 struct drm_i915_private *dev_priv = to_i915(connector->dev);
2013 struct intel_connector *intel_connector = to_intel_connector(connector);
2014 struct intel_panel *panel = &intel_connector->panel;
2015 int ret;
2016
2017 if (!dev_priv->vbt.backlight.present) {
2018 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
2019 drm_dbg_kms(&dev_priv->drm,
2020 "no backlight present per VBT, but present per quirk\n");
2021 } else {
2022 drm_dbg_kms(&dev_priv->drm,
2023 "no backlight present per VBT\n");
2024 return 0;
2025 }
2026 }
2027
2028 /* ensure intel_panel has been initialized first */
2029 if (drm_WARN_ON(&dev_priv->drm, !panel->backlight.funcs))
2030 return -ENODEV;
2031
2032 /* set level and max in panel struct */
2033 mutex_lock(&dev_priv->backlight_lock);
2034 ret = panel->backlight.funcs->setup(intel_connector, pipe);
2035 mutex_unlock(&dev_priv->backlight_lock);
2036
2037 if (ret) {
2038 drm_dbg_kms(&dev_priv->drm,
2039 "failed to setup backlight for connector %s\n",
2040 connector->name);
2041 return ret;
2042 }
2043
2044 panel->backlight.present = true;
2045
2046 drm_dbg_kms(&dev_priv->drm,
2047 "Connector %s backlight initialized, %s, brightness %u/%u\n",
2048 connector->name,
2049 enableddisabled(panel->backlight.enabled),
2050 panel->backlight.level, panel->backlight.max);
2051
2052 return 0;
2053 }
2054
intel_panel_destroy_backlight(struct intel_panel * panel)2055 static void intel_panel_destroy_backlight(struct intel_panel *panel)
2056 {
2057 /* dispose of the pwm */
2058 if (panel->backlight.pwm)
2059 pwm_put(panel->backlight.pwm);
2060
2061 panel->backlight.present = false;
2062 }
2063
2064 static const struct intel_panel_bl_funcs bxt_pwm_funcs = {
2065 .setup = bxt_setup_backlight,
2066 .enable = bxt_enable_backlight,
2067 .disable = bxt_disable_backlight,
2068 .set = bxt_set_backlight,
2069 .get = bxt_get_backlight,
2070 .hz_to_pwm = bxt_hz_to_pwm,
2071 };
2072
2073 static const struct intel_panel_bl_funcs cnp_pwm_funcs = {
2074 .setup = cnp_setup_backlight,
2075 .enable = cnp_enable_backlight,
2076 .disable = cnp_disable_backlight,
2077 .set = bxt_set_backlight,
2078 .get = bxt_get_backlight,
2079 .hz_to_pwm = cnp_hz_to_pwm,
2080 };
2081
2082 static const struct intel_panel_bl_funcs lpt_pwm_funcs = {
2083 .setup = lpt_setup_backlight,
2084 .enable = lpt_enable_backlight,
2085 .disable = lpt_disable_backlight,
2086 .set = lpt_set_backlight,
2087 .get = lpt_get_backlight,
2088 .hz_to_pwm = lpt_hz_to_pwm,
2089 };
2090
2091 static const struct intel_panel_bl_funcs spt_pwm_funcs = {
2092 .setup = lpt_setup_backlight,
2093 .enable = lpt_enable_backlight,
2094 .disable = lpt_disable_backlight,
2095 .set = lpt_set_backlight,
2096 .get = lpt_get_backlight,
2097 .hz_to_pwm = spt_hz_to_pwm,
2098 };
2099
2100 static const struct intel_panel_bl_funcs pch_pwm_funcs = {
2101 .setup = pch_setup_backlight,
2102 .enable = pch_enable_backlight,
2103 .disable = pch_disable_backlight,
2104 .set = pch_set_backlight,
2105 .get = pch_get_backlight,
2106 .hz_to_pwm = pch_hz_to_pwm,
2107 };
2108
2109 static const struct intel_panel_bl_funcs ext_pwm_funcs = {
2110 .setup = ext_pwm_setup_backlight,
2111 .enable = ext_pwm_enable_backlight,
2112 .disable = ext_pwm_disable_backlight,
2113 .set = ext_pwm_set_backlight,
2114 .get = ext_pwm_get_backlight,
2115 };
2116
2117 static const struct intel_panel_bl_funcs vlv_pwm_funcs = {
2118 .setup = vlv_setup_backlight,
2119 .enable = vlv_enable_backlight,
2120 .disable = vlv_disable_backlight,
2121 .set = vlv_set_backlight,
2122 .get = vlv_get_backlight,
2123 .hz_to_pwm = vlv_hz_to_pwm,
2124 };
2125
2126 static const struct intel_panel_bl_funcs i965_pwm_funcs = {
2127 .setup = i965_setup_backlight,
2128 .enable = i965_enable_backlight,
2129 .disable = i965_disable_backlight,
2130 .set = i9xx_set_backlight,
2131 .get = i9xx_get_backlight,
2132 .hz_to_pwm = i965_hz_to_pwm,
2133 };
2134
2135 static const struct intel_panel_bl_funcs i9xx_pwm_funcs = {
2136 .setup = i9xx_setup_backlight,
2137 .enable = i9xx_enable_backlight,
2138 .disable = i9xx_disable_backlight,
2139 .set = i9xx_set_backlight,
2140 .get = i9xx_get_backlight,
2141 .hz_to_pwm = i9xx_hz_to_pwm,
2142 };
2143
2144 static const struct intel_panel_bl_funcs pwm_bl_funcs = {
2145 .setup = intel_pwm_setup_backlight,
2146 .enable = intel_pwm_enable_backlight,
2147 .disable = intel_pwm_disable_backlight,
2148 .set = intel_pwm_set_backlight,
2149 .get = intel_pwm_get_backlight,
2150 };
2151
2152 /* Set up chip specific backlight functions */
2153 static void
intel_panel_init_backlight_funcs(struct intel_panel * panel)2154 intel_panel_init_backlight_funcs(struct intel_panel *panel)
2155 {
2156 struct intel_connector *connector =
2157 container_of(panel, struct intel_connector, panel);
2158 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
2159
2160 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&
2161 intel_dsi_dcs_init_backlight_funcs(connector) == 0)
2162 return;
2163
2164 if (IS_GEN9_LP(dev_priv)) {
2165 panel->backlight.pwm_funcs = &bxt_pwm_funcs;
2166 } else if (INTEL_PCH_TYPE(dev_priv) >= PCH_CNP) {
2167 panel->backlight.pwm_funcs = &cnp_pwm_funcs;
2168 } else if (INTEL_PCH_TYPE(dev_priv) >= PCH_LPT) {
2169 if (HAS_PCH_LPT(dev_priv))
2170 panel->backlight.pwm_funcs = &lpt_pwm_funcs;
2171 else
2172 panel->backlight.pwm_funcs = &spt_pwm_funcs;
2173 } else if (HAS_PCH_SPLIT(dev_priv)) {
2174 panel->backlight.pwm_funcs = &pch_pwm_funcs;
2175 } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
2176 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) {
2177 panel->backlight.pwm_funcs = &ext_pwm_funcs;
2178 } else {
2179 panel->backlight.pwm_funcs = &vlv_pwm_funcs;
2180 }
2181 } else if (IS_DISPLAY_VER(dev_priv, 4)) {
2182 panel->backlight.pwm_funcs = &i965_pwm_funcs;
2183 } else {
2184 panel->backlight.pwm_funcs = &i9xx_pwm_funcs;
2185 }
2186
2187 if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP &&
2188 intel_dp_aux_init_backlight_funcs(connector) == 0)
2189 return;
2190
2191 /* We're using a standard PWM backlight interface */
2192 panel->backlight.funcs = &pwm_bl_funcs;
2193 }
2194
2195 enum drm_connector_status
intel_panel_detect(struct drm_connector * connector,bool force)2196 intel_panel_detect(struct drm_connector *connector, bool force)
2197 {
2198 struct drm_i915_private *i915 = to_i915(connector->dev);
2199
2200 if (!INTEL_DISPLAY_ENABLED(i915))
2201 return connector_status_disconnected;
2202
2203 return connector_status_connected;
2204 }
2205
intel_panel_init(struct intel_panel * panel,struct drm_display_mode * fixed_mode,struct drm_display_mode * downclock_mode)2206 int intel_panel_init(struct intel_panel *panel,
2207 struct drm_display_mode *fixed_mode,
2208 struct drm_display_mode *downclock_mode)
2209 {
2210 intel_panel_init_backlight_funcs(panel);
2211
2212 panel->fixed_mode = fixed_mode;
2213 panel->downclock_mode = downclock_mode;
2214
2215 return 0;
2216 }
2217
intel_panel_fini(struct intel_panel * panel)2218 void intel_panel_fini(struct intel_panel *panel)
2219 {
2220 struct intel_connector *intel_connector =
2221 container_of(panel, struct intel_connector, panel);
2222
2223 intel_panel_destroy_backlight(panel);
2224
2225 if (panel->fixed_mode)
2226 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
2227
2228 if (panel->downclock_mode)
2229 drm_mode_destroy(intel_connector->base.dev,
2230 panel->downclock_mode);
2231 }
2232