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 #include "intel_drv.h"
37
38 #define CRC_PMIC_PWM_PERIOD_NS 21333
39
40 void
intel_fixed_panel_mode(const struct drm_display_mode * fixed_mode,struct drm_display_mode * adjusted_mode)41 intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
42 struct drm_display_mode *adjusted_mode)
43 {
44 drm_mode_copy(adjusted_mode, fixed_mode);
45
46 drm_mode_set_crtcinfo(adjusted_mode, 0);
47 }
48
49 /**
50 * intel_find_panel_downclock - find the reduced downclock for LVDS in EDID
51 * @dev_priv: i915 device instance
52 * @fixed_mode : panel native mode
53 * @connector: LVDS/eDP connector
54 *
55 * Return downclock_avail
56 * Find the reduced downclock for LVDS/eDP in EDID.
57 */
58 struct drm_display_mode *
intel_find_panel_downclock(struct drm_i915_private * dev_priv,struct drm_display_mode * fixed_mode,struct drm_connector * connector)59 intel_find_panel_downclock(struct drm_i915_private *dev_priv,
60 struct drm_display_mode *fixed_mode,
61 struct drm_connector *connector)
62 {
63 struct drm_display_mode *scan, *tmp_mode;
64 int temp_downclock;
65
66 temp_downclock = fixed_mode->clock;
67 tmp_mode = NULL;
68
69 list_for_each_entry(scan, &connector->probed_modes, head) {
70 /*
71 * If one mode has the same resolution with the fixed_panel
72 * mode while they have the different refresh rate, it means
73 * that the reduced downclock is found. In such
74 * case we can set the different FPx0/1 to dynamically select
75 * between low and high frequency.
76 */
77 if (scan->hdisplay == fixed_mode->hdisplay &&
78 scan->hsync_start == fixed_mode->hsync_start &&
79 scan->hsync_end == fixed_mode->hsync_end &&
80 scan->htotal == fixed_mode->htotal &&
81 scan->vdisplay == fixed_mode->vdisplay &&
82 scan->vsync_start == fixed_mode->vsync_start &&
83 scan->vsync_end == fixed_mode->vsync_end &&
84 scan->vtotal == fixed_mode->vtotal) {
85 if (scan->clock < temp_downclock) {
86 /*
87 * The downclock is already found. But we
88 * expect to find the lower downclock.
89 */
90 temp_downclock = scan->clock;
91 tmp_mode = scan;
92 }
93 }
94 }
95
96 if (temp_downclock < fixed_mode->clock)
97 return drm_mode_duplicate(&dev_priv->drm, tmp_mode);
98 else
99 return NULL;
100 }
101
102 /* adjusted_mode has been preset to be the panel's fixed mode */
103 void
intel_pch_panel_fitting(struct intel_crtc * intel_crtc,struct intel_crtc_state * pipe_config,int fitting_mode)104 intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
105 struct intel_crtc_state *pipe_config,
106 int fitting_mode)
107 {
108 const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
109 int x = 0, y = 0, width = 0, height = 0;
110
111 /* Native modes don't need fitting */
112 if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
113 adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h &&
114 !pipe_config->ycbcr420)
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->crtc_hdisplay - width + 1)/2;
122 y = (adjusted_mode->crtc_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->crtc_hdisplay
129 * pipe_config->pipe_src_h;
130 u32 scaled_height = pipe_config->pipe_src_w
131 * adjusted_mode->crtc_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->crtc_hdisplay - width + 1) / 2;
137 y = 0;
138 height = adjusted_mode->crtc_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->crtc_vdisplay - height + 1) / 2;
144 x = 0;
145 width = adjusted_mode->crtc_hdisplay;
146 } else {
147 x = y = 0;
148 width = adjusted_mode->crtc_hdisplay;
149 height = adjusted_mode->crtc_vdisplay;
150 }
151 }
152 break;
153
154 case DRM_MODE_SCALE_FULLSCREEN:
155 x = y = 0;
156 width = adjusted_mode->crtc_hdisplay;
157 height = adjusted_mode->crtc_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 * adjusted_mode,int width)172 centre_horizontally(struct drm_display_mode *adjusted_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 = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;
179 blank_width = adjusted_mode->crtc_hblank_end - adjusted_mode->crtc_hblank_start;
180 sync_pos = (blank_width - sync_width + 1) / 2;
181
182 border = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
183 border += border & 1; /* make the border even */
184
185 adjusted_mode->crtc_hdisplay = width;
186 adjusted_mode->crtc_hblank_start = width + border;
187 adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_hblank_start + blank_width;
188
189 adjusted_mode->crtc_hsync_start = adjusted_mode->crtc_hblank_start + sync_pos;
190 adjusted_mode->crtc_hsync_end = adjusted_mode->crtc_hsync_start + sync_width;
191 }
192
193 static void
centre_vertically(struct drm_display_mode * adjusted_mode,int height)194 centre_vertically(struct drm_display_mode *adjusted_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 = adjusted_mode->crtc_vsync_end - adjusted_mode->crtc_vsync_start;
201 blank_width = adjusted_mode->crtc_vblank_end - adjusted_mode->crtc_vblank_start;
202 sync_pos = (blank_width - sync_width + 1) / 2;
203
204 border = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
205
206 adjusted_mode->crtc_vdisplay = height;
207 adjusted_mode->crtc_vblank_start = height + border;
208 adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vblank_start + blank_width;
209
210 adjusted_mode->crtc_vsync_start = adjusted_mode->crtc_vblank_start + sync_pos;
211 adjusted_mode->crtc_vsync_end = adjusted_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 const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
231 u32 scaled_width = adjusted_mode->crtc_hdisplay *
232 pipe_config->pipe_src_h;
233 u32 scaled_height = pipe_config->pipe_src_w *
234 adjusted_mode->crtc_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->crtc_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->crtc_hdisplay *
253 pipe_config->pipe_src_h;
254 u32 scaled_height = pipe_config->pipe_src_w *
255 adjusted_mode->crtc_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->crtc_vdisplay) {
270 bits = panel_fitter_scaling(pipe_config->pipe_src_h,
271 adjusted_mode->crtc_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->crtc_hdisplay) {
286 bits = panel_fitter_scaling(pipe_config->pipe_src_w,
287 adjusted_mode->crtc_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_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
309 u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
310 struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
311
312 /* Native modes don't need fitting */
313 if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
314 adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h)
315 goto out;
316
317 switch (fitting_mode) {
318 case DRM_MODE_SCALE_CENTER:
319 /*
320 * For centered modes, we have to calculate border widths &
321 * heights and modify the values programmed into the CRTC.
322 */
323 centre_horizontally(adjusted_mode, pipe_config->pipe_src_w);
324 centre_vertically(adjusted_mode, pipe_config->pipe_src_h);
325 border = LVDS_BORDER_ENABLE;
326 break;
327 case DRM_MODE_SCALE_ASPECT:
328 /* Scale but preserve the aspect ratio */
329 if (INTEL_GEN(dev_priv) >= 4)
330 i965_scale_aspect(pipe_config, &pfit_control);
331 else
332 i9xx_scale_aspect(pipe_config, &pfit_control,
333 &pfit_pgm_ratios, &border);
334 break;
335 case DRM_MODE_SCALE_FULLSCREEN:
336 /*
337 * Full scaling, even if it changes the aspect ratio.
338 * Fortunately this is all done for us in hw.
339 */
340 if (pipe_config->pipe_src_h != adjusted_mode->crtc_vdisplay ||
341 pipe_config->pipe_src_w != adjusted_mode->crtc_hdisplay) {
342 pfit_control |= PFIT_ENABLE;
343 if (INTEL_GEN(dev_priv) >= 4)
344 pfit_control |= PFIT_SCALING_AUTO;
345 else
346 pfit_control |= (VERT_AUTO_SCALE |
347 VERT_INTERP_BILINEAR |
348 HORIZ_AUTO_SCALE |
349 HORIZ_INTERP_BILINEAR);
350 }
351 break;
352 default:
353 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
354 return;
355 }
356
357 /* 965+ wants fuzzy fitting */
358 /* FIXME: handle multiple panels by failing gracefully */
359 if (INTEL_GEN(dev_priv) >= 4)
360 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
361 PFIT_FILTER_FUZZY);
362
363 out:
364 if ((pfit_control & PFIT_ENABLE) == 0) {
365 pfit_control = 0;
366 pfit_pgm_ratios = 0;
367 }
368
369 /* Make sure pre-965 set dither correctly for 18bpp panels. */
370 if (INTEL_GEN(dev_priv) < 4 && pipe_config->pipe_bpp == 18)
371 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
372
373 pipe_config->gmch_pfit.control = pfit_control;
374 pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
375 pipe_config->gmch_pfit.lvds_border_bits = border;
376 }
377
378 enum drm_connector_status
intel_panel_detect(struct drm_i915_private * dev_priv)379 intel_panel_detect(struct drm_i915_private *dev_priv)
380 {
381 /* Assume that the BIOS does not lie through the OpRegion... */
382 if (!i915_modparams.panel_ignore_lid && dev_priv->opregion.lid_state) {
383 return *dev_priv->opregion.lid_state & 0x1 ?
384 connector_status_connected :
385 connector_status_disconnected;
386 }
387
388 switch (i915_modparams.panel_ignore_lid) {
389 case -2:
390 return connector_status_connected;
391 case -1:
392 return connector_status_disconnected;
393 default:
394 return connector_status_unknown;
395 }
396 }
397
398 /**
399 * scale - scale values from one range to another
400 *
401 * @source_val: value in range [@source_min..@source_max]
402 *
403 * Return @source_val in range [@source_min..@source_max] scaled to range
404 * [@target_min..@target_max].
405 */
scale(uint32_t source_val,uint32_t source_min,uint32_t source_max,uint32_t target_min,uint32_t target_max)406 static uint32_t scale(uint32_t source_val,
407 uint32_t source_min, uint32_t source_max,
408 uint32_t target_min, uint32_t target_max)
409 {
410 uint64_t target_val;
411
412 WARN_ON(source_min > source_max);
413 WARN_ON(target_min > target_max);
414
415 /* defensive */
416 source_val = clamp(source_val, source_min, source_max);
417
418 /* avoid overflows */
419 target_val = DIV_ROUND_CLOSEST_ULL((uint64_t)(source_val - source_min) *
420 (target_max - target_min), source_max - source_min);
421 target_val += target_min;
422
423 return target_val;
424 }
425
426 /* 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)427 static inline u32 scale_user_to_hw(struct intel_connector *connector,
428 u32 user_level, u32 user_max)
429 {
430 struct intel_panel *panel = &connector->panel;
431
432 return scale(user_level, 0, user_max,
433 panel->backlight.min, panel->backlight.max);
434 }
435
436 /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
437 * to [hw_min..hw_max]. */
clamp_user_to_hw(struct intel_connector * connector,u32 user_level,u32 user_max)438 static inline u32 clamp_user_to_hw(struct intel_connector *connector,
439 u32 user_level, u32 user_max)
440 {
441 struct intel_panel *panel = &connector->panel;
442 u32 hw_level;
443
444 hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
445 hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
446
447 return hw_level;
448 }
449
450 /* 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)451 static inline u32 scale_hw_to_user(struct intel_connector *connector,
452 u32 hw_level, u32 user_max)
453 {
454 struct intel_panel *panel = &connector->panel;
455
456 return scale(hw_level, panel->backlight.min, panel->backlight.max,
457 0, user_max);
458 }
459
intel_panel_compute_brightness(struct intel_connector * connector,u32 val)460 static u32 intel_panel_compute_brightness(struct intel_connector *connector,
461 u32 val)
462 {
463 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
464 struct intel_panel *panel = &connector->panel;
465
466 WARN_ON(panel->backlight.max == 0);
467
468 if (i915_modparams.invert_brightness < 0)
469 return val;
470
471 if (i915_modparams.invert_brightness > 0 ||
472 dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
473 return panel->backlight.max - val + panel->backlight.min;
474 }
475
476 return val;
477 }
478
lpt_get_backlight(struct intel_connector * connector)479 static u32 lpt_get_backlight(struct intel_connector *connector)
480 {
481 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
482
483 return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
484 }
485
pch_get_backlight(struct intel_connector * connector)486 static u32 pch_get_backlight(struct intel_connector *connector)
487 {
488 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
489
490 return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
491 }
492
i9xx_get_backlight(struct intel_connector * connector)493 static u32 i9xx_get_backlight(struct intel_connector *connector)
494 {
495 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
496 struct intel_panel *panel = &connector->panel;
497 u32 val;
498
499 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
500 if (INTEL_INFO(dev_priv)->gen < 4)
501 val >>= 1;
502
503 if (panel->backlight.combination_mode) {
504 u8 lbpc;
505
506 pci_read_config_byte(dev_priv->drm.pdev, LBPC, &lbpc);
507 val *= lbpc;
508 }
509
510 return val;
511 }
512
_vlv_get_backlight(struct drm_i915_private * dev_priv,enum i915_pipe pipe)513 static u32 _vlv_get_backlight(struct drm_i915_private *dev_priv, enum i915_pipe pipe)
514 {
515 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
516 return 0;
517
518 return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
519 }
520
vlv_get_backlight(struct intel_connector * connector)521 static u32 vlv_get_backlight(struct intel_connector *connector)
522 {
523 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
524 enum i915_pipe pipe = intel_get_pipe_from_connector(connector);
525
526 return _vlv_get_backlight(dev_priv, pipe);
527 }
528
bxt_get_backlight(struct intel_connector * connector)529 static u32 bxt_get_backlight(struct intel_connector *connector)
530 {
531 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
532 struct intel_panel *panel = &connector->panel;
533
534 return I915_READ(BXT_BLC_PWM_DUTY(panel->backlight.controller));
535 }
536
pwm_get_backlight(struct intel_connector * connector)537 static u32 pwm_get_backlight(struct intel_connector *connector)
538 {
539 struct intel_panel *panel = &connector->panel;
540 int duty_ns;
541
542 duty_ns = pwm_get_duty_cycle(panel->backlight.pwm);
543 return DIV_ROUND_UP(duty_ns * 100, CRC_PMIC_PWM_PERIOD_NS);
544 }
545
546 #if 0
547 static u32 intel_panel_get_backlight(struct intel_connector *connector)
548 {
549 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
550 struct intel_panel *panel = &connector->panel;
551 u32 val = 0;
552
553 mutex_lock(&dev_priv->backlight_lock);
554
555 if (panel->backlight.enabled) {
556 val = panel->backlight.get(connector);
557 val = intel_panel_compute_brightness(connector, val);
558 }
559
560 mutex_unlock(&dev_priv->backlight_lock);
561
562 DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
563 return val;
564 }
565 #endif
566
lpt_set_backlight(const struct drm_connector_state * conn_state,u32 level)567 static void lpt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
568 {
569 struct intel_connector *connector = to_intel_connector(conn_state->connector);
570 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
571
572 u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
573 I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
574 }
575
pch_set_backlight(const struct drm_connector_state * conn_state,u32 level)576 static void pch_set_backlight(const struct drm_connector_state *conn_state, u32 level)
577 {
578 struct intel_connector *connector = to_intel_connector(conn_state->connector);
579 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
580 u32 tmp;
581
582 tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
583 I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
584 }
585
i9xx_set_backlight(const struct drm_connector_state * conn_state,u32 level)586 static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32 level)
587 {
588 struct intel_connector *connector = to_intel_connector(conn_state->connector);
589 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
590 struct intel_panel *panel = &connector->panel;
591 u32 tmp, mask;
592
593 WARN_ON(panel->backlight.max == 0);
594
595 if (panel->backlight.combination_mode) {
596 u8 lbpc;
597
598 lbpc = level * 0xfe / panel->backlight.max + 1;
599 level /= lbpc;
600 pci_write_config_byte(dev_priv->drm.pdev, LBPC, lbpc);
601 }
602
603 if (IS_GEN4(dev_priv)) {
604 mask = BACKLIGHT_DUTY_CYCLE_MASK;
605 } else {
606 level <<= 1;
607 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
608 }
609
610 tmp = I915_READ(BLC_PWM_CTL) & ~mask;
611 I915_WRITE(BLC_PWM_CTL, tmp | level);
612 }
613
vlv_set_backlight(const struct drm_connector_state * conn_state,u32 level)614 static void vlv_set_backlight(const struct drm_connector_state *conn_state, u32 level)
615 {
616 struct intel_connector *connector = to_intel_connector(conn_state->connector);
617 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
618 enum i915_pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
619 u32 tmp;
620
621 tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
622 I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
623 }
624
bxt_set_backlight(const struct drm_connector_state * conn_state,u32 level)625 static void bxt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
626 {
627 struct intel_connector *connector = to_intel_connector(conn_state->connector);
628 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
629 struct intel_panel *panel = &connector->panel;
630
631 I915_WRITE(BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
632 }
633
pwm_set_backlight(const struct drm_connector_state * conn_state,u32 level)634 static void pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
635 {
636 struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
637 int duty_ns = DIV_ROUND_UP(level * CRC_PMIC_PWM_PERIOD_NS, 100);
638
639 pwm_config(panel->backlight.pwm, duty_ns, CRC_PMIC_PWM_PERIOD_NS);
640 }
641
642 static void
intel_panel_actually_set_backlight(const struct drm_connector_state * conn_state,u32 level)643 intel_panel_actually_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 intel_panel *panel = &connector->panel;
647
648 DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
649
650 level = intel_panel_compute_brightness(connector, level);
651 panel->backlight.set(conn_state, level);
652 }
653
654 /* 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)655 static void intel_panel_set_backlight(const struct drm_connector_state *conn_state,
656 u32 user_level, u32 user_max)
657 {
658 struct intel_connector *connector = to_intel_connector(conn_state->connector);
659 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
660 struct intel_panel *panel = &connector->panel;
661 u32 hw_level;
662
663 if (!panel->backlight.present)
664 return;
665
666 mutex_lock(&dev_priv->backlight_lock);
667
668 WARN_ON(panel->backlight.max == 0);
669
670 hw_level = scale_user_to_hw(connector, user_level, user_max);
671 panel->backlight.level = hw_level;
672
673 if (panel->backlight.enabled)
674 intel_panel_actually_set_backlight(conn_state, hw_level);
675
676 mutex_unlock(&dev_priv->backlight_lock);
677 }
678
679 /* set backlight brightness to level in range [0..max], assuming hw min is
680 * respected.
681 */
intel_panel_set_backlight_acpi(const struct drm_connector_state * conn_state,u32 user_level,u32 user_max)682 void intel_panel_set_backlight_acpi(const struct drm_connector_state *conn_state,
683 u32 user_level, u32 user_max)
684 {
685 struct intel_connector *connector = to_intel_connector(conn_state->connector);
686 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
687 struct intel_panel *panel = &connector->panel;
688 u32 hw_level;
689
690 /*
691 * Lack of crtc may occur during driver init because
692 * connection_mutex isn't held across the entire backlight
693 * setup + modeset readout, and the BIOS can issue the
694 * requests at any time.
695 */
696 if (!panel->backlight.present || !conn_state->crtc)
697 return;
698
699 mutex_lock(&dev_priv->backlight_lock);
700
701 WARN_ON(panel->backlight.max == 0);
702
703 hw_level = clamp_user_to_hw(connector, user_level, user_max);
704 panel->backlight.level = hw_level;
705
706 if (panel->backlight.device)
707 panel->backlight.device->props.brightness =
708 scale_hw_to_user(connector,
709 panel->backlight.level,
710 panel->backlight.device->props.max_brightness);
711
712 if (panel->backlight.enabled)
713 intel_panel_actually_set_backlight(conn_state, hw_level);
714
715 mutex_unlock(&dev_priv->backlight_lock);
716 }
717
lpt_disable_backlight(const struct drm_connector_state * old_conn_state)718 static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state)
719 {
720 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
721 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
722 u32 tmp;
723
724 intel_panel_actually_set_backlight(old_conn_state, 0);
725
726 /*
727 * Although we don't support or enable CPU PWM with LPT/SPT based
728 * systems, it may have been enabled prior to loading the
729 * driver. Disable to avoid warnings on LCPLL disable.
730 *
731 * This needs rework if we need to add support for CPU PWM on PCH split
732 * platforms.
733 */
734 tmp = I915_READ(BLC_PWM_CPU_CTL2);
735 if (tmp & BLM_PWM_ENABLE) {
736 DRM_DEBUG_KMS("cpu backlight was enabled, disabling\n");
737 I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
738 }
739
740 tmp = I915_READ(BLC_PWM_PCH_CTL1);
741 I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
742 }
743
pch_disable_backlight(const struct drm_connector_state * old_conn_state)744 static void pch_disable_backlight(const struct drm_connector_state *old_conn_state)
745 {
746 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
747 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
748 u32 tmp;
749
750 intel_panel_actually_set_backlight(old_conn_state, 0);
751
752 tmp = I915_READ(BLC_PWM_CPU_CTL2);
753 I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
754
755 tmp = I915_READ(BLC_PWM_PCH_CTL1);
756 I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
757 }
758
i9xx_disable_backlight(const struct drm_connector_state * old_conn_state)759 static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state)
760 {
761 intel_panel_actually_set_backlight(old_conn_state, 0);
762 }
763
i965_disable_backlight(const struct drm_connector_state * old_conn_state)764 static void i965_disable_backlight(const struct drm_connector_state *old_conn_state)
765 {
766 struct drm_i915_private *dev_priv = to_i915(old_conn_state->connector->dev);
767 u32 tmp;
768
769 intel_panel_actually_set_backlight(old_conn_state, 0);
770
771 tmp = I915_READ(BLC_PWM_CTL2);
772 I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
773 }
774
vlv_disable_backlight(const struct drm_connector_state * old_conn_state)775 static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state)
776 {
777 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
778 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
779 enum i915_pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe;
780 u32 tmp;
781
782 intel_panel_actually_set_backlight(old_conn_state, 0);
783
784 tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
785 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
786 }
787
bxt_disable_backlight(const struct drm_connector_state * old_conn_state)788 static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state)
789 {
790 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
791 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
792 struct intel_panel *panel = &connector->panel;
793 u32 tmp, val;
794
795 intel_panel_actually_set_backlight(old_conn_state, 0);
796
797 tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
798 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
799 tmp & ~BXT_BLC_PWM_ENABLE);
800
801 if (panel->backlight.controller == 1) {
802 val = I915_READ(UTIL_PIN_CTL);
803 val &= ~UTIL_PIN_ENABLE;
804 I915_WRITE(UTIL_PIN_CTL, val);
805 }
806 }
807
cnp_disable_backlight(const struct drm_connector_state * old_conn_state)808 static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state)
809 {
810 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
811 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
812 struct intel_panel *panel = &connector->panel;
813 u32 tmp;
814
815 intel_panel_actually_set_backlight(old_conn_state, 0);
816
817 tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
818 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
819 tmp & ~BXT_BLC_PWM_ENABLE);
820 }
821
pwm_disable_backlight(const struct drm_connector_state * old_conn_state)822 static void pwm_disable_backlight(const struct drm_connector_state *old_conn_state)
823 {
824 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
825 struct intel_panel *panel = &connector->panel;
826
827 /* Disable the backlight */
828 pwm_config(panel->backlight.pwm, 0, CRC_PMIC_PWM_PERIOD_NS);
829 usleep_range(2000, 3000);
830 pwm_disable(panel->backlight.pwm);
831 }
832
intel_panel_disable_backlight(const struct drm_connector_state * old_conn_state)833 void intel_panel_disable_backlight(const struct drm_connector_state *old_conn_state)
834 {
835 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
836 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
837 struct intel_panel *panel = &connector->panel;
838
839 if (!panel->backlight.present)
840 return;
841
842 /*
843 * Do not disable backlight on the vga_switcheroo path. When switching
844 * away from i915, the other client may depend on i915 to handle the
845 * backlight. This will leave the backlight on unnecessarily when
846 * another client is not activated.
847 */
848 if (dev_priv->drm.switch_power_state == DRM_SWITCH_POWER_CHANGING) {
849 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
850 return;
851 }
852
853 mutex_lock(&dev_priv->backlight_lock);
854
855 if (panel->backlight.device)
856 panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
857 panel->backlight.enabled = false;
858 panel->backlight.disable(old_conn_state);
859
860 mutex_unlock(&dev_priv->backlight_lock);
861 }
862
lpt_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state)863 static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,
864 const struct drm_connector_state *conn_state)
865 {
866 struct intel_connector *connector = to_intel_connector(conn_state->connector);
867 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
868 struct intel_panel *panel = &connector->panel;
869 u32 pch_ctl1, pch_ctl2, schicken;
870
871 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
872 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
873 DRM_DEBUG_KMS("pch backlight already enabled\n");
874 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
875 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
876 }
877
878 if (HAS_PCH_LPT(dev_priv)) {
879 schicken = I915_READ(SOUTH_CHICKEN2);
880 if (panel->backlight.alternate_pwm_increment)
881 schicken |= LPT_PWM_GRANULARITY;
882 else
883 schicken &= ~LPT_PWM_GRANULARITY;
884 I915_WRITE(SOUTH_CHICKEN2, schicken);
885 } else {
886 schicken = I915_READ(SOUTH_CHICKEN1);
887 if (panel->backlight.alternate_pwm_increment)
888 schicken |= SPT_PWM_GRANULARITY;
889 else
890 schicken &= ~SPT_PWM_GRANULARITY;
891 I915_WRITE(SOUTH_CHICKEN1, schicken);
892 }
893
894 pch_ctl2 = panel->backlight.max << 16;
895 I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
896
897 pch_ctl1 = 0;
898 if (panel->backlight.active_low_pwm)
899 pch_ctl1 |= BLM_PCH_POLARITY;
900
901 /* After LPT, override is the default. */
902 if (HAS_PCH_LPT(dev_priv))
903 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
904
905 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
906 POSTING_READ(BLC_PWM_PCH_CTL1);
907 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
908
909 /* This won't stick until the above enable. */
910 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
911 }
912
pch_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state)913 static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
914 const struct drm_connector_state *conn_state)
915 {
916 struct intel_connector *connector = to_intel_connector(conn_state->connector);
917 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
918 struct intel_panel *panel = &connector->panel;
919 enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
920 u32 cpu_ctl2, pch_ctl1, pch_ctl2;
921
922 cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
923 if (cpu_ctl2 & BLM_PWM_ENABLE) {
924 DRM_DEBUG_KMS("cpu backlight already enabled\n");
925 cpu_ctl2 &= ~BLM_PWM_ENABLE;
926 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
927 }
928
929 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
930 if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
931 DRM_DEBUG_KMS("pch backlight already enabled\n");
932 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
933 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
934 }
935
936 if (cpu_transcoder == TRANSCODER_EDP)
937 cpu_ctl2 = BLM_TRANSCODER_EDP;
938 else
939 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
940 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
941 POSTING_READ(BLC_PWM_CPU_CTL2);
942 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
943
944 /* This won't stick until the above enable. */
945 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
946
947 pch_ctl2 = panel->backlight.max << 16;
948 I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
949
950 pch_ctl1 = 0;
951 if (panel->backlight.active_low_pwm)
952 pch_ctl1 |= BLM_PCH_POLARITY;
953
954 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
955 POSTING_READ(BLC_PWM_PCH_CTL1);
956 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
957 }
958
i9xx_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state)959 static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
960 const struct drm_connector_state *conn_state)
961 {
962 struct intel_connector *connector = to_intel_connector(conn_state->connector);
963 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
964 struct intel_panel *panel = &connector->panel;
965 u32 ctl, freq;
966
967 ctl = I915_READ(BLC_PWM_CTL);
968 if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
969 DRM_DEBUG_KMS("backlight already enabled\n");
970 I915_WRITE(BLC_PWM_CTL, 0);
971 }
972
973 freq = panel->backlight.max;
974 if (panel->backlight.combination_mode)
975 freq /= 0xff;
976
977 ctl = freq << 17;
978 if (panel->backlight.combination_mode)
979 ctl |= BLM_LEGACY_MODE;
980 if (IS_PINEVIEW(dev_priv) && panel->backlight.active_low_pwm)
981 ctl |= BLM_POLARITY_PNV;
982
983 I915_WRITE(BLC_PWM_CTL, ctl);
984 POSTING_READ(BLC_PWM_CTL);
985
986 /* XXX: combine this into above write? */
987 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
988
989 /*
990 * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
991 * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
992 * that has backlight.
993 */
994 if (IS_GEN2(dev_priv))
995 I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
996 }
997
i965_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state)998 static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,
999 const struct drm_connector_state *conn_state)
1000 {
1001 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1002 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1003 struct intel_panel *panel = &connector->panel;
1004 enum i915_pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
1005 u32 ctl, ctl2, freq;
1006
1007 ctl2 = I915_READ(BLC_PWM_CTL2);
1008 if (ctl2 & BLM_PWM_ENABLE) {
1009 DRM_DEBUG_KMS("backlight already enabled\n");
1010 ctl2 &= ~BLM_PWM_ENABLE;
1011 I915_WRITE(BLC_PWM_CTL2, ctl2);
1012 }
1013
1014 freq = panel->backlight.max;
1015 if (panel->backlight.combination_mode)
1016 freq /= 0xff;
1017
1018 ctl = freq << 16;
1019 I915_WRITE(BLC_PWM_CTL, ctl);
1020
1021 ctl2 = BLM_PIPE(pipe);
1022 if (panel->backlight.combination_mode)
1023 ctl2 |= BLM_COMBINATION_MODE;
1024 if (panel->backlight.active_low_pwm)
1025 ctl2 |= BLM_POLARITY_I965;
1026 I915_WRITE(BLC_PWM_CTL2, ctl2);
1027 POSTING_READ(BLC_PWM_CTL2);
1028 I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
1029
1030 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1031 }
1032
vlv_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state)1033 static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
1034 const struct drm_connector_state *conn_state)
1035 {
1036 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1037 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1038 struct intel_panel *panel = &connector->panel;
1039 enum i915_pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
1040 u32 ctl, ctl2;
1041
1042 ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1043 if (ctl2 & BLM_PWM_ENABLE) {
1044 DRM_DEBUG_KMS("backlight already enabled\n");
1045 ctl2 &= ~BLM_PWM_ENABLE;
1046 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1047 }
1048
1049 ctl = panel->backlight.max << 16;
1050 I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
1051
1052 /* XXX: combine this into above write? */
1053 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1054
1055 ctl2 = 0;
1056 if (panel->backlight.active_low_pwm)
1057 ctl2 |= BLM_POLARITY_I965;
1058 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
1059 POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
1060 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
1061 }
1062
bxt_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state)1063 static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,
1064 const struct drm_connector_state *conn_state)
1065 {
1066 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1067 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1068 struct intel_panel *panel = &connector->panel;
1069 enum i915_pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
1070 u32 pwm_ctl, val;
1071
1072 /* Controller 1 uses the utility pin. */
1073 if (panel->backlight.controller == 1) {
1074 val = I915_READ(UTIL_PIN_CTL);
1075 if (val & UTIL_PIN_ENABLE) {
1076 DRM_DEBUG_KMS("util pin already enabled\n");
1077 val &= ~UTIL_PIN_ENABLE;
1078 I915_WRITE(UTIL_PIN_CTL, val);
1079 }
1080
1081 val = 0;
1082 if (panel->backlight.util_pin_active_low)
1083 val |= UTIL_PIN_POLARITY;
1084 I915_WRITE(UTIL_PIN_CTL, val | UTIL_PIN_PIPE(pipe) |
1085 UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
1086 }
1087
1088 pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1089 if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1090 DRM_DEBUG_KMS("backlight already enabled\n");
1091 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1092 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1093 pwm_ctl);
1094 }
1095
1096 I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
1097 panel->backlight.max);
1098
1099 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1100
1101 pwm_ctl = 0;
1102 if (panel->backlight.active_low_pwm)
1103 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1104
1105 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
1106 POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1107 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1108 pwm_ctl | BXT_BLC_PWM_ENABLE);
1109 }
1110
cnp_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state)1111 static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,
1112 const struct drm_connector_state *conn_state)
1113 {
1114 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1115 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1116 struct intel_panel *panel = &connector->panel;
1117 u32 pwm_ctl;
1118
1119 pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1120 if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
1121 DRM_DEBUG_KMS("backlight already enabled\n");
1122 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
1123 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1124 pwm_ctl);
1125 }
1126
1127 I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
1128 panel->backlight.max);
1129
1130 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1131
1132 pwm_ctl = 0;
1133 if (panel->backlight.active_low_pwm)
1134 pwm_ctl |= BXT_BLC_PWM_POLARITY;
1135
1136 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
1137 POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1138 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
1139 pwm_ctl | BXT_BLC_PWM_ENABLE);
1140 }
1141
pwm_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state)1142 static void pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
1143 const struct drm_connector_state *conn_state)
1144 {
1145 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1146 struct intel_panel *panel = &connector->panel;
1147
1148 pwm_enable(panel->backlight.pwm);
1149 intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
1150 }
1151
intel_panel_enable_backlight(const struct intel_crtc_state * crtc_state,const struct drm_connector_state * conn_state)1152 void intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
1153 const struct drm_connector_state *conn_state)
1154 {
1155 struct intel_connector *connector = to_intel_connector(conn_state->connector);
1156 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1157 struct intel_panel *panel = &connector->panel;
1158 enum i915_pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
1159
1160 if (!panel->backlight.present)
1161 return;
1162
1163 DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
1164
1165 mutex_lock(&dev_priv->backlight_lock);
1166
1167 WARN_ON(panel->backlight.max == 0);
1168
1169 if (panel->backlight.level <= panel->backlight.min) {
1170 panel->backlight.level = panel->backlight.max;
1171 if (panel->backlight.device)
1172 panel->backlight.device->props.brightness =
1173 scale_hw_to_user(connector,
1174 panel->backlight.level,
1175 panel->backlight.device->props.max_brightness);
1176 }
1177
1178 panel->backlight.enable(crtc_state, conn_state);
1179 panel->backlight.enabled = true;
1180 if (panel->backlight.device)
1181 panel->backlight.device->props.power = FB_BLANK_UNBLANK;
1182
1183 mutex_unlock(&dev_priv->backlight_lock);
1184 }
1185
1186 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
1187 #if 0 /* unused */
1188 static int intel_backlight_device_update_status(struct backlight_device *bd)
1189 {
1190 struct intel_connector *connector = bl_get_data(bd);
1191 struct intel_panel *panel = &connector->panel;
1192 struct drm_device *dev = connector->base.dev;
1193
1194 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1195 DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
1196 bd->props.brightness, bd->props.max_brightness);
1197 intel_panel_set_backlight(connector->base.state, bd->props.brightness,
1198 bd->props.max_brightness);
1199
1200 /*
1201 * Allow flipping bl_power as a sub-state of enabled. Sadly the
1202 * backlight class device does not make it easy to to differentiate
1203 * between callbacks for brightness and bl_power, so our backlight_power
1204 * callback needs to take this into account.
1205 */
1206 if (panel->backlight.enabled) {
1207 if (panel->backlight.power) {
1208 bool enable = bd->props.power == FB_BLANK_UNBLANK &&
1209 bd->props.brightness != 0;
1210 panel->backlight.power(connector, enable);
1211 }
1212 } else {
1213 bd->props.power = FB_BLANK_POWERDOWN;
1214 }
1215
1216 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1217 return 0;
1218 }
1219
1220 static int intel_backlight_device_get_brightness(struct backlight_device *bd)
1221 {
1222 struct intel_connector *connector = bl_get_data(bd);
1223 struct drm_device *dev = connector->base.dev;
1224 struct drm_i915_private *dev_priv = to_i915(dev);
1225 u32 hw_level;
1226 int ret;
1227
1228 intel_runtime_pm_get(dev_priv);
1229 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1230
1231 hw_level = intel_panel_get_backlight(connector);
1232 ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
1233
1234 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1235 intel_runtime_pm_put(dev_priv);
1236
1237 return ret;
1238 }
1239
1240 static const struct backlight_ops intel_backlight_device_ops = {
1241 .update_status = intel_backlight_device_update_status,
1242 .get_brightness = intel_backlight_device_get_brightness,
1243 };
1244 #endif
1245
intel_backlight_device_register(struct intel_connector * connector)1246 int intel_backlight_device_register(struct intel_connector *connector)
1247 {
1248 struct intel_panel *panel = &connector->panel;
1249 struct backlight_properties props;
1250
1251 if (WARN_ON(panel->backlight.device))
1252 return -ENODEV;
1253
1254 if (!panel->backlight.present)
1255 return 0;
1256
1257 WARN_ON(panel->backlight.max == 0);
1258
1259 memset(&props, 0, sizeof(props));
1260 props.type = BACKLIGHT_RAW;
1261
1262 /*
1263 * Note: Everything should work even if the backlight device max
1264 * presented to the userspace is arbitrarily chosen.
1265 */
1266 props.max_brightness = panel->backlight.max;
1267 props.brightness = scale_hw_to_user(connector,
1268 panel->backlight.level,
1269 props.max_brightness);
1270
1271 if (panel->backlight.enabled)
1272 props.power = FB_BLANK_UNBLANK;
1273 else
1274 props.power = FB_BLANK_POWERDOWN;
1275
1276 /*
1277 * Note: using the same name independent of the connector prevents
1278 * registration of multiple backlight devices in the driver.
1279 */
1280 #if 0
1281 panel->backlight.device =
1282 backlight_device_register("intel_backlight",
1283 connector->base.kdev,
1284 connector,
1285 &intel_backlight_device_ops, &props);
1286
1287 if (IS_ERR(panel->backlight.device)) {
1288 DRM_ERROR("Failed to register backlight: %ld\n",
1289 PTR_ERR(panel->backlight.device));
1290 panel->backlight.device = NULL;
1291 return -ENODEV;
1292 }
1293
1294 DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
1295 connector->base.name);
1296 #endif
1297
1298 return 0;
1299 }
1300
intel_backlight_device_unregister(struct intel_connector * connector)1301 void intel_backlight_device_unregister(struct intel_connector *connector)
1302 {
1303 #if 0
1304 struct intel_panel *panel = &connector->panel;
1305
1306 if (panel->backlight.device) {
1307 backlight_device_unregister(panel->backlight.device);
1308 panel->backlight.device = NULL;
1309 }
1310 #endif
1311 }
1312 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
1313
1314 /*
1315 * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
1316 * PWM increment = 1
1317 */
cnp_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1318 static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1319 {
1320 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1321
1322 return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz);
1323 }
1324
1325 /*
1326 * BXT: PWM clock frequency = 19.2 MHz.
1327 */
bxt_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1328 static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1329 {
1330 return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz);
1331 }
1332
1333 /*
1334 * SPT: This value represents the period of the PWM stream in clock periods
1335 * multiplied by 16 (default increment) or 128 (alternate increment selected in
1336 * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
1337 */
spt_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1338 static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1339 {
1340 struct intel_panel *panel = &connector->panel;
1341 u32 mul;
1342
1343 if (panel->backlight.alternate_pwm_increment)
1344 mul = 128;
1345 else
1346 mul = 16;
1347
1348 return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz * mul);
1349 }
1350
1351 /*
1352 * LPT: This value represents the period of the PWM stream in clock periods
1353 * multiplied by 128 (default increment) or 16 (alternate increment, selected in
1354 * LPT SOUTH_CHICKEN2 register bit 5).
1355 */
lpt_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1356 static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1357 {
1358 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1359 struct intel_panel *panel = &connector->panel;
1360 u32 mul, clock;
1361
1362 if (panel->backlight.alternate_pwm_increment)
1363 mul = 16;
1364 else
1365 mul = 128;
1366
1367 if (HAS_PCH_LPT_H(dev_priv))
1368 clock = MHz(135); /* LPT:H */
1369 else
1370 clock = MHz(24); /* LPT:LP */
1371
1372 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1373 }
1374
1375 /*
1376 * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
1377 * display raw clocks multiplied by 128.
1378 */
pch_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1379 static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1380 {
1381 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1382
1383 return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz * 128);
1384 }
1385
1386 /*
1387 * Gen2: This field determines the number of time base events (display core
1388 * clock frequency/32) in total for a complete cycle of modulated backlight
1389 * control.
1390 *
1391 * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
1392 * divided by 32.
1393 */
i9xx_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1394 static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1395 {
1396 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1397 int clock;
1398
1399 if (IS_PINEVIEW(dev_priv))
1400 clock = KHz(dev_priv->rawclk_freq);
1401 else
1402 clock = KHz(dev_priv->cdclk.hw.cdclk);
1403
1404 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 32);
1405 }
1406
1407 /*
1408 * Gen4: This value represents the period of the PWM stream in display core
1409 * clocks ([DevCTG] HRAW clocks) multiplied by 128.
1410 *
1411 */
i965_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1412 static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1413 {
1414 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1415 int clock;
1416
1417 if (IS_G4X(dev_priv))
1418 clock = KHz(dev_priv->rawclk_freq);
1419 else
1420 clock = KHz(dev_priv->cdclk.hw.cdclk);
1421
1422 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 128);
1423 }
1424
1425 /*
1426 * VLV: This value represents the period of the PWM stream in display core
1427 * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
1428 * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
1429 */
vlv_hz_to_pwm(struct intel_connector * connector,u32 pwm_freq_hz)1430 static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
1431 {
1432 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1433 int mul, clock;
1434
1435 if ((I915_READ(CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
1436 if (IS_CHERRYVIEW(dev_priv))
1437 clock = KHz(19200);
1438 else
1439 clock = MHz(25);
1440 mul = 16;
1441 } else {
1442 clock = KHz(dev_priv->rawclk_freq);
1443 mul = 128;
1444 }
1445
1446 return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
1447 }
1448
get_backlight_max_vbt(struct intel_connector * connector)1449 static u32 get_backlight_max_vbt(struct intel_connector *connector)
1450 {
1451 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1452 struct intel_panel *panel = &connector->panel;
1453 u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
1454 u32 pwm;
1455
1456 if (!panel->backlight.hz_to_pwm) {
1457 DRM_DEBUG_KMS("backlight frequency conversion not supported\n");
1458 return 0;
1459 }
1460
1461 if (pwm_freq_hz) {
1462 DRM_DEBUG_KMS("VBT defined backlight frequency %u Hz\n",
1463 pwm_freq_hz);
1464 } else {
1465 pwm_freq_hz = 200;
1466 DRM_DEBUG_KMS("default backlight frequency %u Hz\n",
1467 pwm_freq_hz);
1468 }
1469
1470 pwm = panel->backlight.hz_to_pwm(connector, pwm_freq_hz);
1471 if (!pwm) {
1472 DRM_DEBUG_KMS("backlight frequency conversion failed\n");
1473 return 0;
1474 }
1475
1476 return pwm;
1477 }
1478
1479 /*
1480 * Note: The setup hooks can't assume pipe is set!
1481 */
get_backlight_min_vbt(struct intel_connector * connector)1482 static u32 get_backlight_min_vbt(struct intel_connector *connector)
1483 {
1484 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1485 struct intel_panel *panel = &connector->panel;
1486 int min;
1487
1488 WARN_ON(panel->backlight.max == 0);
1489
1490 /*
1491 * XXX: If the vbt value is 255, it makes min equal to max, which leads
1492 * to problems. There are such machines out there. Either our
1493 * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
1494 * against this by letting the minimum be at most (arbitrarily chosen)
1495 * 25% of the max.
1496 */
1497 min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
1498 if (min != dev_priv->vbt.backlight.min_brightness) {
1499 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
1500 dev_priv->vbt.backlight.min_brightness, min);
1501 }
1502
1503 /* vbt value is a coefficient in range [0..255] */
1504 return scale(min, 0, 255, 0, panel->backlight.max);
1505 }
1506
lpt_setup_backlight(struct intel_connector * connector,enum i915_pipe unused)1507 static int lpt_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1508 {
1509 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1510 struct intel_panel *panel = &connector->panel;
1511 u32 pch_ctl1, pch_ctl2, val;
1512 bool alt;
1513
1514 if (HAS_PCH_LPT(dev_priv))
1515 alt = I915_READ(SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY;
1516 else
1517 alt = I915_READ(SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;
1518 panel->backlight.alternate_pwm_increment = alt;
1519
1520 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1521 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1522
1523 pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1524 panel->backlight.max = pch_ctl2 >> 16;
1525
1526 if (!panel->backlight.max)
1527 panel->backlight.max = get_backlight_max_vbt(connector);
1528
1529 if (!panel->backlight.max)
1530 return -ENODEV;
1531
1532 panel->backlight.min = get_backlight_min_vbt(connector);
1533
1534 val = lpt_get_backlight(connector);
1535 val = intel_panel_compute_brightness(connector, val);
1536 panel->backlight.level = clamp(val, panel->backlight.min,
1537 panel->backlight.max);
1538
1539 panel->backlight.enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;
1540
1541 return 0;
1542 }
1543
pch_setup_backlight(struct intel_connector * connector,enum i915_pipe unused)1544 static int pch_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1545 {
1546 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1547 struct intel_panel *panel = &connector->panel;
1548 u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
1549
1550 pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
1551 panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
1552
1553 pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
1554 panel->backlight.max = pch_ctl2 >> 16;
1555
1556 if (!panel->backlight.max)
1557 panel->backlight.max = get_backlight_max_vbt(connector);
1558
1559 if (!panel->backlight.max)
1560 return -ENODEV;
1561
1562 panel->backlight.min = get_backlight_min_vbt(connector);
1563
1564 val = pch_get_backlight(connector);
1565 val = intel_panel_compute_brightness(connector, val);
1566 panel->backlight.level = clamp(val, panel->backlight.min,
1567 panel->backlight.max);
1568
1569 cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
1570 panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
1571 (pch_ctl1 & BLM_PCH_PWM_ENABLE);
1572
1573 return 0;
1574 }
1575
i9xx_setup_backlight(struct intel_connector * connector,enum i915_pipe unused)1576 static int i9xx_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1577 {
1578 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1579 struct intel_panel *panel = &connector->panel;
1580 u32 ctl, val;
1581
1582 ctl = I915_READ(BLC_PWM_CTL);
1583
1584 if (IS_GEN2(dev_priv) || IS_I915GM(dev_priv) || IS_I945GM(dev_priv))
1585 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
1586
1587 if (IS_PINEVIEW(dev_priv))
1588 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
1589
1590 panel->backlight.max = ctl >> 17;
1591
1592 if (!panel->backlight.max) {
1593 panel->backlight.max = get_backlight_max_vbt(connector);
1594 panel->backlight.max >>= 1;
1595 }
1596
1597 if (!panel->backlight.max)
1598 return -ENODEV;
1599
1600 if (panel->backlight.combination_mode)
1601 panel->backlight.max *= 0xff;
1602
1603 panel->backlight.min = get_backlight_min_vbt(connector);
1604
1605 val = i9xx_get_backlight(connector);
1606 val = intel_panel_compute_brightness(connector, val);
1607 panel->backlight.level = clamp(val, panel->backlight.min,
1608 panel->backlight.max);
1609
1610 panel->backlight.enabled = val != 0;
1611
1612 return 0;
1613 }
1614
i965_setup_backlight(struct intel_connector * connector,enum i915_pipe unused)1615 static int i965_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1616 {
1617 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1618 struct intel_panel *panel = &connector->panel;
1619 u32 ctl, ctl2, val;
1620
1621 ctl2 = I915_READ(BLC_PWM_CTL2);
1622 panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
1623 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1624
1625 ctl = I915_READ(BLC_PWM_CTL);
1626 panel->backlight.max = ctl >> 16;
1627
1628 if (!panel->backlight.max)
1629 panel->backlight.max = get_backlight_max_vbt(connector);
1630
1631 if (!panel->backlight.max)
1632 return -ENODEV;
1633
1634 if (panel->backlight.combination_mode)
1635 panel->backlight.max *= 0xff;
1636
1637 panel->backlight.min = get_backlight_min_vbt(connector);
1638
1639 val = i9xx_get_backlight(connector);
1640 val = intel_panel_compute_brightness(connector, val);
1641 panel->backlight.level = clamp(val, panel->backlight.min,
1642 panel->backlight.max);
1643
1644 panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
1645
1646 return 0;
1647 }
1648
vlv_setup_backlight(struct intel_connector * connector,enum i915_pipe pipe)1649 static int vlv_setup_backlight(struct intel_connector *connector, enum i915_pipe pipe)
1650 {
1651 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1652 struct intel_panel *panel = &connector->panel;
1653 u32 ctl, ctl2, val;
1654
1655 if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
1656 return -ENODEV;
1657
1658 ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
1659 panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
1660
1661 ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
1662 panel->backlight.max = ctl >> 16;
1663
1664 if (!panel->backlight.max)
1665 panel->backlight.max = get_backlight_max_vbt(connector);
1666
1667 if (!panel->backlight.max)
1668 return -ENODEV;
1669
1670 panel->backlight.min = get_backlight_min_vbt(connector);
1671
1672 val = _vlv_get_backlight(dev_priv, pipe);
1673 val = intel_panel_compute_brightness(connector, val);
1674 panel->backlight.level = clamp(val, panel->backlight.min,
1675 panel->backlight.max);
1676
1677 panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
1678
1679 return 0;
1680 }
1681
1682 static int
bxt_setup_backlight(struct intel_connector * connector,enum i915_pipe unused)1683 bxt_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1684 {
1685 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1686 struct intel_panel *panel = &connector->panel;
1687 u32 pwm_ctl, val;
1688
1689 panel->backlight.controller = dev_priv->vbt.backlight.controller;
1690
1691 pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1692
1693 /* Controller 1 uses the utility pin. */
1694 if (panel->backlight.controller == 1) {
1695 val = I915_READ(UTIL_PIN_CTL);
1696 panel->backlight.util_pin_active_low =
1697 val & UTIL_PIN_POLARITY;
1698 }
1699
1700 panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1701 panel->backlight.max =
1702 I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
1703
1704 if (!panel->backlight.max)
1705 panel->backlight.max = get_backlight_max_vbt(connector);
1706
1707 if (!panel->backlight.max)
1708 return -ENODEV;
1709
1710 panel->backlight.min = get_backlight_min_vbt(connector);
1711
1712 panel->backlight.min = get_backlight_min_vbt(connector);
1713
1714 val = bxt_get_backlight(connector);
1715 val = intel_panel_compute_brightness(connector, val);
1716 panel->backlight.level = clamp(val, panel->backlight.min,
1717 panel->backlight.max);
1718
1719 panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1720
1721 return 0;
1722 }
1723
1724 static int
cnp_setup_backlight(struct intel_connector * connector,enum i915_pipe unused)1725 cnp_setup_backlight(struct intel_connector *connector, enum i915_pipe unused)
1726 {
1727 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1728 struct intel_panel *panel = &connector->panel;
1729 u32 pwm_ctl, val;
1730
1731 /*
1732 * CNP has the BXT implementation of backlight, but with only
1733 * one controller. Future platforms could have multiple controllers
1734 * so let's make this extensible and prepared for the future.
1735 */
1736 panel->backlight.controller = 0;
1737
1738 pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
1739
1740 panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
1741 panel->backlight.max =
1742 I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
1743
1744 if (!panel->backlight.max)
1745 panel->backlight.max = get_backlight_max_vbt(connector);
1746
1747 if (!panel->backlight.max)
1748 return -ENODEV;
1749
1750 panel->backlight.min = get_backlight_min_vbt(connector);
1751
1752 panel->backlight.min = get_backlight_min_vbt(connector);
1753
1754 val = bxt_get_backlight(connector);
1755 val = intel_panel_compute_brightness(connector, val);
1756 panel->backlight.level = clamp(val, panel->backlight.min,
1757 panel->backlight.max);
1758
1759 panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
1760
1761 return 0;
1762 }
1763
pwm_setup_backlight(struct intel_connector * connector,enum i915_pipe pipe)1764 static int pwm_setup_backlight(struct intel_connector *connector,
1765 enum i915_pipe pipe)
1766 {
1767 struct drm_device *dev = connector->base.dev;
1768 struct intel_panel *panel = &connector->panel;
1769 int retval;
1770
1771 /* Get the PWM chip for backlight control */
1772 panel->backlight.pwm = pwm_get(dev->dev, "pwm_backlight");
1773 if (IS_ERR(panel->backlight.pwm)) {
1774 DRM_ERROR("Failed to own the pwm chip\n");
1775 panel->backlight.pwm = NULL;
1776 return -ENODEV;
1777 }
1778
1779 /*
1780 * FIXME: pwm_apply_args() should be removed when switching to
1781 * the atomic PWM API.
1782 */
1783 #if 0
1784 pwm_apply_args(panel->backlight.pwm);
1785 #endif
1786
1787 retval = pwm_config(panel->backlight.pwm, CRC_PMIC_PWM_PERIOD_NS,
1788 CRC_PMIC_PWM_PERIOD_NS);
1789 if (retval < 0) {
1790 DRM_ERROR("Failed to configure the pwm chip\n");
1791 pwm_put(panel->backlight.pwm);
1792 panel->backlight.pwm = NULL;
1793 return retval;
1794 }
1795
1796 panel->backlight.min = 0; /* 0% */
1797 panel->backlight.max = 100; /* 100% */
1798 panel->backlight.level = DIV_ROUND_UP(
1799 pwm_get_duty_cycle(panel->backlight.pwm) * 100,
1800 CRC_PMIC_PWM_PERIOD_NS);
1801 panel->backlight.enabled = panel->backlight.level != 0;
1802
1803 return 0;
1804 }
1805
1806 #ifdef __DragonFly__
1807 /*
1808 * Read max backlight level
1809 */
1810 static int
sysctl_backlight_max(SYSCTL_HANDLER_ARGS)1811 sysctl_backlight_max(SYSCTL_HANDLER_ARGS)
1812 {
1813 int err, val;
1814 struct intel_connector *connector = arg1;
1815 struct drm_device *dev = connector->base.dev;
1816 struct drm_i915_private *dev_priv = dev->dev_private;
1817 struct intel_panel *panel = &connector->panel;
1818
1819 mutex_lock(&dev_priv->backlight_lock);
1820 val = panel->backlight.max;
1821 mutex_unlock(&dev_priv->backlight_lock);
1822
1823 err = sysctl_handle_int(oidp, &val, 0, req);
1824 return(err);
1825 }
1826
1827 /*
1828 * Read/write backlight level
1829 */
1830 static int
sysctl_backlight_handler(SYSCTL_HANDLER_ARGS)1831 sysctl_backlight_handler(SYSCTL_HANDLER_ARGS)
1832 {
1833 struct intel_connector *connector = arg1;
1834 const struct drm_connector_state *conn_state = connector->base.state;
1835 struct drm_device *dev = connector->base.dev;
1836 struct drm_i915_private *dev_priv = dev->dev_private;
1837 struct intel_panel *panel = &connector->panel;
1838 int err, val;
1839 u32 user_level, max_brightness;
1840
1841 mutex_lock(&dev_priv->backlight_lock);
1842 max_brightness = panel->backlight.max;
1843 user_level = scale_hw_to_user(connector, panel->backlight.level,
1844 max_brightness);
1845 mutex_unlock(&dev_priv->backlight_lock);
1846
1847 val = user_level;
1848 err = sysctl_handle_int(oidp, &val, 0, req);
1849 if (err != 0 || req->newptr == NULL) {
1850 return(err);
1851 }
1852
1853 if (val != user_level && val >= 0 && val <= max_brightness) {
1854 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1855 intel_panel_set_backlight(conn_state, val, max_brightness);
1856 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1857 }
1858
1859 return(err);
1860 }
1861 #endif /* __DragonFly__ */
1862
intel_panel_setup_backlight(struct drm_connector * connector,enum i915_pipe pipe)1863 int intel_panel_setup_backlight(struct drm_connector *connector, enum i915_pipe pipe)
1864 {
1865 struct drm_i915_private *dev_priv = to_i915(connector->dev);
1866 struct intel_connector *intel_connector = to_intel_connector(connector);
1867 struct intel_panel *panel = &intel_connector->panel;
1868 int ret;
1869
1870 if (!dev_priv->vbt.backlight.present) {
1871 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
1872 DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
1873 } else {
1874 DRM_DEBUG_KMS("no backlight present per VBT\n");
1875 return 0;
1876 }
1877 }
1878
1879 /* ensure intel_panel has been initialized first */
1880 if (WARN_ON(!panel->backlight.setup))
1881 return -ENODEV;
1882
1883 /* set level and max in panel struct */
1884 mutex_lock(&dev_priv->backlight_lock);
1885 ret = panel->backlight.setup(intel_connector, pipe);
1886 mutex_unlock(&dev_priv->backlight_lock);
1887
1888 if (ret) {
1889 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
1890 connector->name);
1891 return ret;
1892 }
1893
1894 panel->backlight.present = true;
1895
1896 #ifdef __DragonFly__
1897 SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children,
1898 OID_AUTO, "backlight_max",
1899 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_ANYBODY,
1900 connector, sizeof(int),
1901 sysctl_backlight_max,
1902 "I", "Max backlight level");
1903 SYSCTL_ADD_PROC(&connector->dev->sysctl->ctx, &sysctl__hw_children,
1904 OID_AUTO, "backlight_level",
1905 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY,
1906 connector, sizeof(int),
1907 sysctl_backlight_handler,
1908 "I", "Backlight level");
1909 #endif
1910
1911 DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
1912 connector->name,
1913 enableddisabled(panel->backlight.enabled),
1914 panel->backlight.level, panel->backlight.max);
1915
1916 return 0;
1917 }
1918
intel_panel_destroy_backlight(struct drm_connector * connector)1919 void intel_panel_destroy_backlight(struct drm_connector *connector)
1920 {
1921 struct intel_connector *intel_connector = to_intel_connector(connector);
1922 struct intel_panel *panel = &intel_connector->panel;
1923
1924 /* dispose of the pwm */
1925 if (panel->backlight.pwm)
1926 pwm_put(panel->backlight.pwm);
1927
1928 panel->backlight.present = false;
1929 }
1930
1931 /* Set up chip specific backlight functions */
1932 static void
intel_panel_init_backlight_funcs(struct intel_panel * panel)1933 intel_panel_init_backlight_funcs(struct intel_panel *panel)
1934 {
1935 struct intel_connector *connector =
1936 container_of(panel, struct intel_connector, panel);
1937 struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1938
1939 if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP &&
1940 intel_dp_aux_init_backlight_funcs(connector) == 0)
1941 return;
1942
1943 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&
1944 intel_dsi_dcs_init_backlight_funcs(connector) == 0)
1945 return;
1946
1947 if (IS_GEN9_LP(dev_priv)) {
1948 panel->backlight.setup = bxt_setup_backlight;
1949 panel->backlight.enable = bxt_enable_backlight;
1950 panel->backlight.disable = bxt_disable_backlight;
1951 panel->backlight.set = bxt_set_backlight;
1952 panel->backlight.get = bxt_get_backlight;
1953 panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
1954 } else if (HAS_PCH_CNP(dev_priv)) {
1955 panel->backlight.setup = cnp_setup_backlight;
1956 panel->backlight.enable = cnp_enable_backlight;
1957 panel->backlight.disable = cnp_disable_backlight;
1958 panel->backlight.set = bxt_set_backlight;
1959 panel->backlight.get = bxt_get_backlight;
1960 panel->backlight.hz_to_pwm = cnp_hz_to_pwm;
1961 } else if (HAS_PCH_LPT(dev_priv) || HAS_PCH_SPT(dev_priv) ||
1962 HAS_PCH_KBP(dev_priv)) {
1963 panel->backlight.setup = lpt_setup_backlight;
1964 panel->backlight.enable = lpt_enable_backlight;
1965 panel->backlight.disable = lpt_disable_backlight;
1966 panel->backlight.set = lpt_set_backlight;
1967 panel->backlight.get = lpt_get_backlight;
1968 if (HAS_PCH_LPT(dev_priv))
1969 panel->backlight.hz_to_pwm = lpt_hz_to_pwm;
1970 else
1971 panel->backlight.hz_to_pwm = spt_hz_to_pwm;
1972 } else if (HAS_PCH_SPLIT(dev_priv)) {
1973 panel->backlight.setup = pch_setup_backlight;
1974 panel->backlight.enable = pch_enable_backlight;
1975 panel->backlight.disable = pch_disable_backlight;
1976 panel->backlight.set = pch_set_backlight;
1977 panel->backlight.get = pch_get_backlight;
1978 panel->backlight.hz_to_pwm = pch_hz_to_pwm;
1979 } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
1980 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) {
1981 panel->backlight.setup = pwm_setup_backlight;
1982 panel->backlight.enable = pwm_enable_backlight;
1983 panel->backlight.disable = pwm_disable_backlight;
1984 panel->backlight.set = pwm_set_backlight;
1985 panel->backlight.get = pwm_get_backlight;
1986 } else {
1987 panel->backlight.setup = vlv_setup_backlight;
1988 panel->backlight.enable = vlv_enable_backlight;
1989 panel->backlight.disable = vlv_disable_backlight;
1990 panel->backlight.set = vlv_set_backlight;
1991 panel->backlight.get = vlv_get_backlight;
1992 panel->backlight.hz_to_pwm = vlv_hz_to_pwm;
1993 }
1994 } else if (IS_GEN4(dev_priv)) {
1995 panel->backlight.setup = i965_setup_backlight;
1996 panel->backlight.enable = i965_enable_backlight;
1997 panel->backlight.disable = i965_disable_backlight;
1998 panel->backlight.set = i9xx_set_backlight;
1999 panel->backlight.get = i9xx_get_backlight;
2000 panel->backlight.hz_to_pwm = i965_hz_to_pwm;
2001 } else {
2002 panel->backlight.setup = i9xx_setup_backlight;
2003 panel->backlight.enable = i9xx_enable_backlight;
2004 panel->backlight.disable = i9xx_disable_backlight;
2005 panel->backlight.set = i9xx_set_backlight;
2006 panel->backlight.get = i9xx_get_backlight;
2007 panel->backlight.hz_to_pwm = i9xx_hz_to_pwm;
2008 }
2009 }
2010
intel_panel_init(struct intel_panel * panel,struct drm_display_mode * fixed_mode,struct drm_display_mode * alt_fixed_mode,struct drm_display_mode * downclock_mode)2011 int intel_panel_init(struct intel_panel *panel,
2012 struct drm_display_mode *fixed_mode,
2013 struct drm_display_mode *alt_fixed_mode,
2014 struct drm_display_mode *downclock_mode)
2015 {
2016 intel_panel_init_backlight_funcs(panel);
2017
2018 panel->fixed_mode = fixed_mode;
2019 panel->alt_fixed_mode = alt_fixed_mode;
2020 panel->downclock_mode = downclock_mode;
2021
2022 return 0;
2023 }
2024
intel_panel_fini(struct intel_panel * panel)2025 void intel_panel_fini(struct intel_panel *panel)
2026 {
2027 struct intel_connector *intel_connector =
2028 container_of(panel, struct intel_connector, panel);
2029
2030 if (panel->fixed_mode)
2031 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
2032
2033 if (panel->alt_fixed_mode)
2034 drm_mode_destroy(intel_connector->base.dev,
2035 panel->alt_fixed_mode);
2036
2037 if (panel->downclock_mode)
2038 drm_mode_destroy(intel_connector->base.dev,
2039 panel->downclock_mode);
2040 }
2041