drm/i915: disable LVDS downclock by default
[linux-2.6.git] / drivers / gpu / drm / i915 / intel_lvds.c
1 /*
2  * Copyright © 2006-2007 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  */
29
30 #include <acpi/button.h>
31 #include <linux/dmi.h>
32 #include <linux/i2c.h>
33 #include "drmP.h"
34 #include "drm.h"
35 #include "drm_crtc.h"
36 #include "drm_edid.h"
37 #include "intel_drv.h"
38 #include "i915_drm.h"
39 #include "i915_drv.h"
40 #include <linux/acpi.h>
41
42 /* Private structure for the integrated LVDS support */
43 struct intel_lvds_priv {
44         int fitting_mode;
45         u32 pfit_control;
46         u32 pfit_pgm_ratios;
47 };
48
49 /**
50  * Sets the backlight level.
51  *
52  * \param level backlight level, from 0 to intel_lvds_get_max_backlight().
53  */
54 static void intel_lvds_set_backlight(struct drm_device *dev, int level)
55 {
56         struct drm_i915_private *dev_priv = dev->dev_private;
57         u32 blc_pwm_ctl, reg;
58
59         if (IS_IRONLAKE(dev))
60                 reg = BLC_PWM_CPU_CTL;
61         else
62                 reg = BLC_PWM_CTL;
63
64         blc_pwm_ctl = I915_READ(reg) & ~BACKLIGHT_DUTY_CYCLE_MASK;
65         I915_WRITE(reg, (blc_pwm_ctl |
66                                  (level << BACKLIGHT_DUTY_CYCLE_SHIFT)));
67 }
68
69 /**
70  * Returns the maximum level of the backlight duty cycle field.
71  */
72 static u32 intel_lvds_get_max_backlight(struct drm_device *dev)
73 {
74         struct drm_i915_private *dev_priv = dev->dev_private;
75         u32 reg;
76
77         if (IS_IRONLAKE(dev))
78                 reg = BLC_PWM_PCH_CTL2;
79         else
80                 reg = BLC_PWM_CTL;
81
82         return ((I915_READ(reg) & BACKLIGHT_MODULATION_FREQ_MASK) >>
83                 BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
84 }
85
86 /**
87  * Sets the power state for the panel.
88  */
89 static void intel_lvds_set_power(struct drm_device *dev, bool on)
90 {
91         struct drm_i915_private *dev_priv = dev->dev_private;
92         u32 pp_status, ctl_reg, status_reg;
93
94         if (IS_IRONLAKE(dev)) {
95                 ctl_reg = PCH_PP_CONTROL;
96                 status_reg = PCH_PP_STATUS;
97         } else {
98                 ctl_reg = PP_CONTROL;
99                 status_reg = PP_STATUS;
100         }
101
102         if (on) {
103                 I915_WRITE(ctl_reg, I915_READ(ctl_reg) |
104                            POWER_TARGET_ON);
105                 do {
106                         pp_status = I915_READ(status_reg);
107                 } while ((pp_status & PP_ON) == 0);
108
109                 intel_lvds_set_backlight(dev, dev_priv->backlight_duty_cycle);
110         } else {
111                 intel_lvds_set_backlight(dev, 0);
112
113                 I915_WRITE(ctl_reg, I915_READ(ctl_reg) &
114                            ~POWER_TARGET_ON);
115                 do {
116                         pp_status = I915_READ(status_reg);
117                 } while (pp_status & PP_ON);
118         }
119 }
120
121 static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)
122 {
123         struct drm_device *dev = encoder->dev;
124
125         if (mode == DRM_MODE_DPMS_ON)
126                 intel_lvds_set_power(dev, true);
127         else
128                 intel_lvds_set_power(dev, false);
129
130         /* XXX: We never power down the LVDS pairs. */
131 }
132
133 static void intel_lvds_save(struct drm_connector *connector)
134 {
135         struct drm_device *dev = connector->dev;
136         struct drm_i915_private *dev_priv = dev->dev_private;
137         u32 pp_on_reg, pp_off_reg, pp_ctl_reg, pp_div_reg;
138         u32 pwm_ctl_reg;
139
140         if (IS_IRONLAKE(dev)) {
141                 pp_on_reg = PCH_PP_ON_DELAYS;
142                 pp_off_reg = PCH_PP_OFF_DELAYS;
143                 pp_ctl_reg = PCH_PP_CONTROL;
144                 pp_div_reg = PCH_PP_DIVISOR;
145                 pwm_ctl_reg = BLC_PWM_CPU_CTL;
146         } else {
147                 pp_on_reg = PP_ON_DELAYS;
148                 pp_off_reg = PP_OFF_DELAYS;
149                 pp_ctl_reg = PP_CONTROL;
150                 pp_div_reg = PP_DIVISOR;
151                 pwm_ctl_reg = BLC_PWM_CTL;
152         }
153
154         dev_priv->savePP_ON = I915_READ(pp_on_reg);
155         dev_priv->savePP_OFF = I915_READ(pp_off_reg);
156         dev_priv->savePP_CONTROL = I915_READ(pp_ctl_reg);
157         dev_priv->savePP_DIVISOR = I915_READ(pp_div_reg);
158         dev_priv->saveBLC_PWM_CTL = I915_READ(pwm_ctl_reg);
159         dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
160                                        BACKLIGHT_DUTY_CYCLE_MASK);
161
162         /*
163          * If the light is off at server startup, just make it full brightness
164          */
165         if (dev_priv->backlight_duty_cycle == 0)
166                 dev_priv->backlight_duty_cycle =
167                         intel_lvds_get_max_backlight(dev);
168 }
169
170 static void intel_lvds_restore(struct drm_connector *connector)
171 {
172         struct drm_device *dev = connector->dev;
173         struct drm_i915_private *dev_priv = dev->dev_private;
174         u32 pp_on_reg, pp_off_reg, pp_ctl_reg, pp_div_reg;
175         u32 pwm_ctl_reg;
176
177         if (IS_IRONLAKE(dev)) {
178                 pp_on_reg = PCH_PP_ON_DELAYS;
179                 pp_off_reg = PCH_PP_OFF_DELAYS;
180                 pp_ctl_reg = PCH_PP_CONTROL;
181                 pp_div_reg = PCH_PP_DIVISOR;
182                 pwm_ctl_reg = BLC_PWM_CPU_CTL;
183         } else {
184                 pp_on_reg = PP_ON_DELAYS;
185                 pp_off_reg = PP_OFF_DELAYS;
186                 pp_ctl_reg = PP_CONTROL;
187                 pp_div_reg = PP_DIVISOR;
188                 pwm_ctl_reg = BLC_PWM_CTL;
189         }
190
191         I915_WRITE(pwm_ctl_reg, dev_priv->saveBLC_PWM_CTL);
192         I915_WRITE(pp_on_reg, dev_priv->savePP_ON);
193         I915_WRITE(pp_off_reg, dev_priv->savePP_OFF);
194         I915_WRITE(pp_div_reg, dev_priv->savePP_DIVISOR);
195         I915_WRITE(pp_ctl_reg, dev_priv->savePP_CONTROL);
196         if (dev_priv->savePP_CONTROL & POWER_TARGET_ON)
197                 intel_lvds_set_power(dev, true);
198         else
199                 intel_lvds_set_power(dev, false);
200 }
201
202 static int intel_lvds_mode_valid(struct drm_connector *connector,
203                                  struct drm_display_mode *mode)
204 {
205         struct drm_device *dev = connector->dev;
206         struct drm_i915_private *dev_priv = dev->dev_private;
207         struct drm_display_mode *fixed_mode = dev_priv->panel_fixed_mode;
208
209         if (fixed_mode) {
210                 if (mode->hdisplay > fixed_mode->hdisplay)
211                         return MODE_PANEL;
212                 if (mode->vdisplay > fixed_mode->vdisplay)
213                         return MODE_PANEL;
214         }
215
216         return MODE_OK;
217 }
218
219 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
220                                   struct drm_display_mode *mode,
221                                   struct drm_display_mode *adjusted_mode)
222 {
223         /*
224          * float point operation is not supported . So the PANEL_RATIO_FACTOR
225          * is defined, which can avoid the float point computation when
226          * calculating the panel ratio.
227          */
228 #define PANEL_RATIO_FACTOR 8192
229         struct drm_device *dev = encoder->dev;
230         struct drm_i915_private *dev_priv = dev->dev_private;
231         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
232         struct drm_encoder *tmp_encoder;
233         struct intel_output *intel_output = enc_to_intel_output(encoder);
234         struct intel_lvds_priv *lvds_priv = intel_output->dev_priv;
235         u32 pfit_control = 0, pfit_pgm_ratios = 0;
236         int left_border = 0, right_border = 0, top_border = 0;
237         int bottom_border = 0;
238         bool border = 0;
239         int panel_ratio, desired_ratio, vert_scale, horiz_scale;
240         int horiz_ratio, vert_ratio;
241         u32 hsync_width, vsync_width;
242         u32 hblank_width, vblank_width;
243         u32 hsync_pos, vsync_pos;
244
245         /* Should never happen!! */
246         if (!IS_I965G(dev) && intel_crtc->pipe == 0) {
247                 DRM_ERROR("Can't support LVDS on pipe A\n");
248                 return false;
249         }
250
251         /* Should never happen!! */
252         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, head) {
253                 if (tmp_encoder != encoder && tmp_encoder->crtc == encoder->crtc) {
254                         DRM_ERROR("Can't enable LVDS and another "
255                                "encoder on the same pipe\n");
256                         return false;
257                 }
258         }
259         /* If we don't have a panel mode, there is nothing we can do */
260         if (dev_priv->panel_fixed_mode == NULL)
261                 return true;
262         /*
263          * If we have timings from the BIOS for the panel, put them in
264          * to the adjusted mode.  The CRTC will be set up for this mode,
265          * with the panel scaling set up to source from the H/VDisplay
266          * of the original mode.
267          */
268         if (dev_priv->panel_fixed_mode != NULL) {
269                 adjusted_mode->hdisplay = dev_priv->panel_fixed_mode->hdisplay;
270                 adjusted_mode->hsync_start =
271                         dev_priv->panel_fixed_mode->hsync_start;
272                 adjusted_mode->hsync_end =
273                         dev_priv->panel_fixed_mode->hsync_end;
274                 adjusted_mode->htotal = dev_priv->panel_fixed_mode->htotal;
275                 adjusted_mode->vdisplay = dev_priv->panel_fixed_mode->vdisplay;
276                 adjusted_mode->vsync_start =
277                         dev_priv->panel_fixed_mode->vsync_start;
278                 adjusted_mode->vsync_end =
279                         dev_priv->panel_fixed_mode->vsync_end;
280                 adjusted_mode->vtotal = dev_priv->panel_fixed_mode->vtotal;
281                 adjusted_mode->clock = dev_priv->panel_fixed_mode->clock;
282                 drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);
283         }
284
285         /* Make sure pre-965s set dither correctly */
286         if (!IS_I965G(dev)) {
287                 if (dev_priv->panel_wants_dither || dev_priv->lvds_dither)
288                         pfit_control |= PANEL_8TO6_DITHER_ENABLE;
289         }
290
291         /* Native modes don't need fitting */
292         if (adjusted_mode->hdisplay == mode->hdisplay &&
293                         adjusted_mode->vdisplay == mode->vdisplay) {
294                 pfit_pgm_ratios = 0;
295                 border = 0;
296                 goto out;
297         }
298
299         /* full screen scale for now */
300         if (IS_IRONLAKE(dev))
301                 goto out;
302
303         /* 965+ wants fuzzy fitting */
304         if (IS_I965G(dev))
305                 pfit_control |= (intel_crtc->pipe << PFIT_PIPE_SHIFT) |
306                                         PFIT_FILTER_FUZZY;
307
308         hsync_width = adjusted_mode->crtc_hsync_end -
309                                         adjusted_mode->crtc_hsync_start;
310         vsync_width = adjusted_mode->crtc_vsync_end -
311                                         adjusted_mode->crtc_vsync_start;
312         hblank_width = adjusted_mode->crtc_hblank_end -
313                                         adjusted_mode->crtc_hblank_start;
314         vblank_width = adjusted_mode->crtc_vblank_end -
315                                         adjusted_mode->crtc_vblank_start;
316         /*
317          * Deal with panel fitting options. Figure out how to stretch the
318          * image based on its aspect ratio & the current panel fitting mode.
319          */
320         panel_ratio = adjusted_mode->hdisplay * PANEL_RATIO_FACTOR /
321                                 adjusted_mode->vdisplay;
322         desired_ratio = mode->hdisplay * PANEL_RATIO_FACTOR /
323                                 mode->vdisplay;
324         /*
325          * Enable automatic panel scaling for non-native modes so that they fill
326          * the screen.  Should be enabled before the pipe is enabled, according
327          * to register description and PRM.
328          * Change the value here to see the borders for debugging
329          */
330         if (!IS_IRONLAKE(dev)) {
331                 I915_WRITE(BCLRPAT_A, 0);
332                 I915_WRITE(BCLRPAT_B, 0);
333         }
334
335         switch (lvds_priv->fitting_mode) {
336         case DRM_MODE_SCALE_CENTER:
337                 /*
338                  * For centered modes, we have to calculate border widths &
339                  * heights and modify the values programmed into the CRTC.
340                  */
341                 left_border = (adjusted_mode->hdisplay - mode->hdisplay) / 2;
342                 right_border = left_border;
343                 if (mode->hdisplay & 1)
344                         right_border++;
345                 top_border = (adjusted_mode->vdisplay - mode->vdisplay) / 2;
346                 bottom_border = top_border;
347                 if (mode->vdisplay & 1)
348                         bottom_border++;
349                 /* Set active & border values */
350                 adjusted_mode->crtc_hdisplay = mode->hdisplay;
351                 /* Keep the boder be even */
352                 if (right_border & 1)
353                         right_border++;
354                 /* use the border directly instead of border minuse one */
355                 adjusted_mode->crtc_hblank_start = mode->hdisplay +
356                                                 right_border;
357                 /* keep the blank width constant */
358                 adjusted_mode->crtc_hblank_end =
359                         adjusted_mode->crtc_hblank_start + hblank_width;
360                 /* get the hsync pos relative to hblank start */
361                 hsync_pos = (hblank_width - hsync_width) / 2;
362                 /* keep the hsync pos be even */
363                 if (hsync_pos & 1)
364                         hsync_pos++;
365                 adjusted_mode->crtc_hsync_start =
366                                 adjusted_mode->crtc_hblank_start + hsync_pos;
367                 /* keep the hsync width constant */
368                 adjusted_mode->crtc_hsync_end =
369                                 adjusted_mode->crtc_hsync_start + hsync_width;
370                 adjusted_mode->crtc_vdisplay = mode->vdisplay;
371                 /* use the border instead of border minus one */
372                 adjusted_mode->crtc_vblank_start = mode->vdisplay +
373                                                 bottom_border;
374                 /* keep the vblank width constant */
375                 adjusted_mode->crtc_vblank_end =
376                                 adjusted_mode->crtc_vblank_start + vblank_width;
377                 /* get the vsync start postion relative to vblank start */
378                 vsync_pos = (vblank_width - vsync_width) / 2;
379                 adjusted_mode->crtc_vsync_start =
380                                 adjusted_mode->crtc_vblank_start + vsync_pos;
381                 /* keep the vsync width constant */
382                 adjusted_mode->crtc_vsync_end =
383                                 adjusted_mode->crtc_vsync_start + vsync_width;
384                 border = 1;
385                 break;
386         case DRM_MODE_SCALE_ASPECT:
387                 /* Scale but preserve the spect ratio */
388                 pfit_control |= PFIT_ENABLE;
389                 if (IS_I965G(dev)) {
390                         /* 965+ is easy, it does everything in hw */
391                         if (panel_ratio > desired_ratio)
392                                 pfit_control |= PFIT_SCALING_PILLAR;
393                         else if (panel_ratio < desired_ratio)
394                                 pfit_control |= PFIT_SCALING_LETTER;
395                         else
396                                 pfit_control |= PFIT_SCALING_AUTO;
397                 } else {
398                         /*
399                          * For earlier chips we have to calculate the scaling
400                          * ratio by hand and program it into the
401                          * PFIT_PGM_RATIO register
402                          */
403                         u32 horiz_bits, vert_bits, bits = 12;
404                         horiz_ratio = mode->hdisplay * PANEL_RATIO_FACTOR/
405                                                 adjusted_mode->hdisplay;
406                         vert_ratio = mode->vdisplay * PANEL_RATIO_FACTOR/
407                                                 adjusted_mode->vdisplay;
408                         horiz_scale = adjusted_mode->hdisplay *
409                                         PANEL_RATIO_FACTOR / mode->hdisplay;
410                         vert_scale = adjusted_mode->vdisplay *
411                                         PANEL_RATIO_FACTOR / mode->vdisplay;
412
413                         /* retain aspect ratio */
414                         if (panel_ratio > desired_ratio) { /* Pillar */
415                                 u32 scaled_width;
416                                 scaled_width = mode->hdisplay * vert_scale /
417                                                 PANEL_RATIO_FACTOR;
418                                 horiz_ratio = vert_ratio;
419                                 pfit_control |= (VERT_AUTO_SCALE |
420                                                  VERT_INTERP_BILINEAR |
421                                                  HORIZ_INTERP_BILINEAR);
422                                 /* Pillar will have left/right borders */
423                                 left_border = (adjusted_mode->hdisplay -
424                                                 scaled_width) / 2;
425                                 right_border = left_border;
426                                 if (mode->hdisplay & 1) /* odd resolutions */
427                                         right_border++;
428                                 /* keep the border be even */
429                                 if (right_border & 1)
430                                         right_border++;
431                                 adjusted_mode->crtc_hdisplay = scaled_width;
432                                 /* use border instead of border minus one */
433                                 adjusted_mode->crtc_hblank_start =
434                                         scaled_width + right_border;
435                                 /* keep the hblank width constant */
436                                 adjusted_mode->crtc_hblank_end =
437                                         adjusted_mode->crtc_hblank_start +
438                                                         hblank_width;
439                                 /*
440                                  * get the hsync start pos relative to
441                                  * hblank start
442                                  */
443                                 hsync_pos = (hblank_width - hsync_width) / 2;
444                                 /* keep the hsync_pos be even */
445                                 if (hsync_pos & 1)
446                                         hsync_pos++;
447                                 adjusted_mode->crtc_hsync_start =
448                                         adjusted_mode->crtc_hblank_start +
449                                                         hsync_pos;
450                                 /* keept hsync width constant */
451                                 adjusted_mode->crtc_hsync_end =
452                                         adjusted_mode->crtc_hsync_start +
453                                                         hsync_width;
454                                 border = 1;
455                         } else if (panel_ratio < desired_ratio) { /* letter */
456                                 u32 scaled_height = mode->vdisplay *
457                                         horiz_scale / PANEL_RATIO_FACTOR;
458                                 vert_ratio = horiz_ratio;
459                                 pfit_control |= (HORIZ_AUTO_SCALE |
460                                                  VERT_INTERP_BILINEAR |
461                                                  HORIZ_INTERP_BILINEAR);
462                                 /* Letterbox will have top/bottom border */
463                                 top_border = (adjusted_mode->vdisplay -
464                                         scaled_height) / 2;
465                                 bottom_border = top_border;
466                                 if (mode->vdisplay & 1)
467                                         bottom_border++;
468                                 adjusted_mode->crtc_vdisplay = scaled_height;
469                                 /* use border instead of border minus one */
470                                 adjusted_mode->crtc_vblank_start =
471                                         scaled_height + bottom_border;
472                                 /* keep the vblank width constant */
473                                 adjusted_mode->crtc_vblank_end =
474                                         adjusted_mode->crtc_vblank_start +
475                                                         vblank_width;
476                                 /*
477                                  * get the vsync start pos relative to
478                                  * vblank start
479                                  */
480                                 vsync_pos = (vblank_width - vsync_width) / 2;
481                                 adjusted_mode->crtc_vsync_start =
482                                         adjusted_mode->crtc_vblank_start +
483                                                         vsync_pos;
484                                 /* keep the vsync width constant */
485                                 adjusted_mode->crtc_vsync_end =
486                                         adjusted_mode->crtc_vsync_start +
487                                                         vsync_width;
488                                 border = 1;
489                         } else {
490                         /* Aspects match, Let hw scale both directions */
491                                 pfit_control |= (VERT_AUTO_SCALE |
492                                                  HORIZ_AUTO_SCALE |
493                                                  VERT_INTERP_BILINEAR |
494                                                  HORIZ_INTERP_BILINEAR);
495                         }
496                         horiz_bits = (1 << bits) * horiz_ratio /
497                                         PANEL_RATIO_FACTOR;
498                         vert_bits = (1 << bits) * vert_ratio /
499                                         PANEL_RATIO_FACTOR;
500                         pfit_pgm_ratios =
501                                 ((vert_bits << PFIT_VERT_SCALE_SHIFT) &
502                                                 PFIT_VERT_SCALE_MASK) |
503                                 ((horiz_bits << PFIT_HORIZ_SCALE_SHIFT) &
504                                                 PFIT_HORIZ_SCALE_MASK);
505                 }
506                 break;
507
508         case DRM_MODE_SCALE_FULLSCREEN:
509                 /*
510                  * Full scaling, even if it changes the aspect ratio.
511                  * Fortunately this is all done for us in hw.
512                  */
513                 pfit_control |= PFIT_ENABLE;
514                 if (IS_I965G(dev))
515                         pfit_control |= PFIT_SCALING_AUTO;
516                 else
517                         pfit_control |= (VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
518                                          VERT_INTERP_BILINEAR |
519                                          HORIZ_INTERP_BILINEAR);
520                 break;
521         default:
522                 break;
523         }
524
525 out:
526         lvds_priv->pfit_control = pfit_control;
527         lvds_priv->pfit_pgm_ratios = pfit_pgm_ratios;
528         /*
529          * When there exists the border, it means that the LVDS_BORDR
530          * should be enabled.
531          */
532         if (border)
533                 dev_priv->lvds_border_bits |= LVDS_BORDER_ENABLE;
534         else
535                 dev_priv->lvds_border_bits &= ~(LVDS_BORDER_ENABLE);
536         /*
537          * XXX: It would be nice to support lower refresh rates on the
538          * panels to reduce power consumption, and perhaps match the
539          * user's requested refresh rate.
540          */
541
542         return true;
543 }
544
545 static void intel_lvds_prepare(struct drm_encoder *encoder)
546 {
547         struct drm_device *dev = encoder->dev;
548         struct drm_i915_private *dev_priv = dev->dev_private;
549         u32 reg;
550
551         if (IS_IRONLAKE(dev))
552                 reg = BLC_PWM_CPU_CTL;
553         else
554                 reg = BLC_PWM_CTL;
555
556         dev_priv->saveBLC_PWM_CTL = I915_READ(reg);
557         dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
558                                        BACKLIGHT_DUTY_CYCLE_MASK);
559
560         intel_lvds_set_power(dev, false);
561 }
562
563 static void intel_lvds_commit( struct drm_encoder *encoder)
564 {
565         struct drm_device *dev = encoder->dev;
566         struct drm_i915_private *dev_priv = dev->dev_private;
567
568         if (dev_priv->backlight_duty_cycle == 0)
569                 dev_priv->backlight_duty_cycle =
570                         intel_lvds_get_max_backlight(dev);
571
572         intel_lvds_set_power(dev, true);
573 }
574
575 static void intel_lvds_mode_set(struct drm_encoder *encoder,
576                                 struct drm_display_mode *mode,
577                                 struct drm_display_mode *adjusted_mode)
578 {
579         struct drm_device *dev = encoder->dev;
580         struct drm_i915_private *dev_priv = dev->dev_private;
581         struct intel_output *intel_output = enc_to_intel_output(encoder);
582         struct intel_lvds_priv *lvds_priv = intel_output->dev_priv;
583
584         /*
585          * The LVDS pin pair will already have been turned on in the
586          * intel_crtc_mode_set since it has a large impact on the DPLL
587          * settings.
588          */
589
590         if (IS_IRONLAKE(dev))
591                 return;
592
593         /*
594          * Enable automatic panel scaling so that non-native modes fill the
595          * screen.  Should be enabled before the pipe is enabled, according to
596          * register description and PRM.
597          */
598         I915_WRITE(PFIT_PGM_RATIOS, lvds_priv->pfit_pgm_ratios);
599         I915_WRITE(PFIT_CONTROL, lvds_priv->pfit_control);
600 }
601
602 /* Some lid devices report incorrect lid status, assume they're connected */
603 static const struct dmi_system_id bad_lid_status[] = {
604         {
605                 .ident = "Compaq nx9020",
606                 .matches = {
607                         DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
608                         DMI_MATCH(DMI_BOARD_NAME, "3084"),
609                 },
610         },
611         {
612                 .ident = "Samsung SX20S",
613                 .matches = {
614                         DMI_MATCH(DMI_SYS_VENDOR, "Phoenix Technologies LTD"),
615                         DMI_MATCH(DMI_BOARD_NAME, "SX20S"),
616                 },
617         },
618         {
619                 .ident = "Aspire One",
620                 .matches = {
621                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
622                         DMI_MATCH(DMI_PRODUCT_NAME, "Aspire one"),
623                 },
624         },
625         {
626                 .ident = "PC-81005",
627                 .matches = {
628                         DMI_MATCH(DMI_SYS_VENDOR, "MALATA"),
629                         DMI_MATCH(DMI_PRODUCT_NAME, "PC-81005"),
630                 },
631         },
632         { }
633 };
634
635 /**
636  * Detect the LVDS connection.
637  *
638  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
639  * connected and closed means disconnected.  We also send hotplug events as
640  * needed, using lid status notification from the input layer.
641  */
642 static enum drm_connector_status intel_lvds_detect(struct drm_connector *connector)
643 {
644         enum drm_connector_status status = connector_status_connected;
645
646         if (!acpi_lid_open() && !dmi_check_system(bad_lid_status))
647                 status = connector_status_disconnected;
648
649         return status;
650 }
651
652 /**
653  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
654  */
655 static int intel_lvds_get_modes(struct drm_connector *connector)
656 {
657         struct drm_device *dev = connector->dev;
658         struct intel_output *intel_output = to_intel_output(connector);
659         struct drm_i915_private *dev_priv = dev->dev_private;
660         int ret = 0;
661
662         ret = intel_ddc_get_modes(intel_output);
663
664         if (ret)
665                 return ret;
666
667         /* Didn't get an EDID, so
668          * Set wide sync ranges so we get all modes
669          * handed to valid_mode for checking
670          */
671         connector->display_info.min_vfreq = 0;
672         connector->display_info.max_vfreq = 200;
673         connector->display_info.min_hfreq = 0;
674         connector->display_info.max_hfreq = 200;
675
676         if (dev_priv->panel_fixed_mode != NULL) {
677                 struct drm_display_mode *mode;
678
679                 mode = drm_mode_duplicate(dev, dev_priv->panel_fixed_mode);
680                 drm_mode_probed_add(connector, mode);
681
682                 return 1;
683         }
684
685         return 0;
686 }
687
688 /*
689  * Lid events. Note the use of 'modeset_on_lid':
690  *  - we set it on lid close, and reset it on open
691  *  - we use it as a "only once" bit (ie we ignore
692  *    duplicate events where it was already properly
693  *    set/reset)
694  *  - the suspend/resume paths will also set it to
695  *    zero, since they restore the mode ("lid open").
696  */
697 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
698                             void *unused)
699 {
700         struct drm_i915_private *dev_priv =
701                 container_of(nb, struct drm_i915_private, lid_notifier);
702         struct drm_device *dev = dev_priv->dev;
703         struct drm_connector *connector = dev_priv->int_lvds_connector;
704
705         /*
706          * check and update the status of LVDS connector after receiving
707          * the LID nofication event.
708          */
709         if (connector)
710                 connector->status = connector->funcs->detect(connector);
711         if (!acpi_lid_open()) {
712                 dev_priv->modeset_on_lid = 1;
713                 return NOTIFY_OK;
714         }
715
716         if (!dev_priv->modeset_on_lid)
717                 return NOTIFY_OK;
718
719         dev_priv->modeset_on_lid = 0;
720
721         mutex_lock(&dev->mode_config.mutex);
722         drm_helper_resume_force_mode(dev);
723         mutex_unlock(&dev->mode_config.mutex);
724
725         return NOTIFY_OK;
726 }
727
728 /**
729  * intel_lvds_destroy - unregister and free LVDS structures
730  * @connector: connector to free
731  *
732  * Unregister the DDC bus for this connector then free the driver private
733  * structure.
734  */
735 static void intel_lvds_destroy(struct drm_connector *connector)
736 {
737         struct drm_device *dev = connector->dev;
738         struct intel_output *intel_output = to_intel_output(connector);
739         struct drm_i915_private *dev_priv = dev->dev_private;
740
741         if (intel_output->ddc_bus)
742                 intel_i2c_destroy(intel_output->ddc_bus);
743         if (dev_priv->lid_notifier.notifier_call)
744                 acpi_lid_notifier_unregister(&dev_priv->lid_notifier);
745         drm_sysfs_connector_remove(connector);
746         drm_connector_cleanup(connector);
747         kfree(connector);
748 }
749
750 static int intel_lvds_set_property(struct drm_connector *connector,
751                                    struct drm_property *property,
752                                    uint64_t value)
753 {
754         struct drm_device *dev = connector->dev;
755         struct intel_output *intel_output =
756                         to_intel_output(connector);
757
758         if (property == dev->mode_config.scaling_mode_property &&
759                                 connector->encoder) {
760                 struct drm_crtc *crtc = connector->encoder->crtc;
761                 struct intel_lvds_priv *lvds_priv = intel_output->dev_priv;
762                 if (value == DRM_MODE_SCALE_NONE) {
763                         DRM_DEBUG_KMS("no scaling not supported\n");
764                         return 0;
765                 }
766                 if (lvds_priv->fitting_mode == value) {
767                         /* the LVDS scaling property is not changed */
768                         return 0;
769                 }
770                 lvds_priv->fitting_mode = value;
771                 if (crtc && crtc->enabled) {
772                         /*
773                          * If the CRTC is enabled, the display will be changed
774                          * according to the new panel fitting mode.
775                          */
776                         drm_crtc_helper_set_mode(crtc, &crtc->mode,
777                                 crtc->x, crtc->y, crtc->fb);
778                 }
779         }
780
781         return 0;
782 }
783
784 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
785         .dpms = intel_lvds_dpms,
786         .mode_fixup = intel_lvds_mode_fixup,
787         .prepare = intel_lvds_prepare,
788         .mode_set = intel_lvds_mode_set,
789         .commit = intel_lvds_commit,
790 };
791
792 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
793         .get_modes = intel_lvds_get_modes,
794         .mode_valid = intel_lvds_mode_valid,
795         .best_encoder = intel_best_encoder,
796 };
797
798 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
799         .dpms = drm_helper_connector_dpms,
800         .save = intel_lvds_save,
801         .restore = intel_lvds_restore,
802         .detect = intel_lvds_detect,
803         .fill_modes = drm_helper_probe_single_connector_modes,
804         .set_property = intel_lvds_set_property,
805         .destroy = intel_lvds_destroy,
806 };
807
808
809 static void intel_lvds_enc_destroy(struct drm_encoder *encoder)
810 {
811         drm_encoder_cleanup(encoder);
812 }
813
814 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
815         .destroy = intel_lvds_enc_destroy,
816 };
817
818 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
819 {
820         DRM_DEBUG_KMS("Skipping LVDS initialization for %s\n", id->ident);
821         return 1;
822 }
823
824 /* These systems claim to have LVDS, but really don't */
825 static const struct dmi_system_id intel_no_lvds[] = {
826         {
827                 .callback = intel_no_lvds_dmi_callback,
828                 .ident = "Apple Mac Mini (Core series)",
829                 .matches = {
830                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
831                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
832                 },
833         },
834         {
835                 .callback = intel_no_lvds_dmi_callback,
836                 .ident = "Apple Mac Mini (Core 2 series)",
837                 .matches = {
838                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
839                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
840                 },
841         },
842         {
843                 .callback = intel_no_lvds_dmi_callback,
844                 .ident = "MSI IM-945GSE-A",
845                 .matches = {
846                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
847                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
848                 },
849         },
850         {
851                 .callback = intel_no_lvds_dmi_callback,
852                 .ident = "Dell Studio Hybrid",
853                 .matches = {
854                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
855                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
856                 },
857         },
858         {
859                 .callback = intel_no_lvds_dmi_callback,
860                 .ident = "AOpen Mini PC",
861                 .matches = {
862                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
863                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
864                 },
865         },
866         {
867                 .callback = intel_no_lvds_dmi_callback,
868                 .ident = "AOpen Mini PC MP915",
869                 .matches = {
870                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
871                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
872                 },
873         },
874         {
875                 .callback = intel_no_lvds_dmi_callback,
876                 .ident = "Aopen i945GTt-VFA",
877                 .matches = {
878                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
879                 },
880         },
881
882         { }     /* terminating entry */
883 };
884
885 /**
886  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
887  * @dev: drm device
888  * @connector: LVDS connector
889  *
890  * Find the reduced downclock for LVDS in EDID.
891  */
892 static void intel_find_lvds_downclock(struct drm_device *dev,
893                                 struct drm_connector *connector)
894 {
895         struct drm_i915_private *dev_priv = dev->dev_private;
896         struct drm_display_mode *scan, *panel_fixed_mode;
897         int temp_downclock;
898
899         panel_fixed_mode = dev_priv->panel_fixed_mode;
900         temp_downclock = panel_fixed_mode->clock;
901
902         mutex_lock(&dev->mode_config.mutex);
903         list_for_each_entry(scan, &connector->probed_modes, head) {
904                 /*
905                  * If one mode has the same resolution with the fixed_panel
906                  * mode while they have the different refresh rate, it means
907                  * that the reduced downclock is found for the LVDS. In such
908                  * case we can set the different FPx0/1 to dynamically select
909                  * between low and high frequency.
910                  */
911                 if (scan->hdisplay == panel_fixed_mode->hdisplay &&
912                         scan->hsync_start == panel_fixed_mode->hsync_start &&
913                         scan->hsync_end == panel_fixed_mode->hsync_end &&
914                         scan->htotal == panel_fixed_mode->htotal &&
915                         scan->vdisplay == panel_fixed_mode->vdisplay &&
916                         scan->vsync_start == panel_fixed_mode->vsync_start &&
917                         scan->vsync_end == panel_fixed_mode->vsync_end &&
918                         scan->vtotal == panel_fixed_mode->vtotal) {
919                         if (scan->clock < temp_downclock) {
920                                 /*
921                                  * The downclock is already found. But we
922                                  * expect to find the lower downclock.
923                                  */
924                                 temp_downclock = scan->clock;
925                         }
926                 }
927         }
928         mutex_unlock(&dev->mode_config.mutex);
929         if (temp_downclock < panel_fixed_mode->clock &&
930             i915_lvds_downclock) {
931                 /* We found the downclock for LVDS. */
932                 dev_priv->lvds_downclock_avail = 1;
933                 dev_priv->lvds_downclock = temp_downclock;
934                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
935                                 "Normal clock %dKhz, downclock %dKhz\n",
936                                 panel_fixed_mode->clock, temp_downclock);
937         }
938         return;
939 }
940
941 /*
942  * Enumerate the child dev array parsed from VBT to check whether
943  * the LVDS is present.
944  * If it is present, return 1.
945  * If it is not present, return false.
946  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
947  * Note: The addin_offset should also be checked for LVDS panel.
948  * Only when it is non-zero, it is assumed that it is present.
949  */
950 static int lvds_is_present_in_vbt(struct drm_device *dev)
951 {
952         struct drm_i915_private *dev_priv = dev->dev_private;
953         struct child_device_config *p_child;
954         int i, ret;
955
956         if (!dev_priv->child_dev_num)
957                 return 1;
958
959         ret = 0;
960         for (i = 0; i < dev_priv->child_dev_num; i++) {
961                 p_child = dev_priv->child_dev + i;
962                 /*
963                  * If the device type is not LFP, continue.
964                  * If the device type is 0x22, it is also regarded as LFP.
965                  */
966                 if (p_child->device_type != DEVICE_TYPE_INT_LFP &&
967                         p_child->device_type != DEVICE_TYPE_LFP)
968                         continue;
969
970                 /* The addin_offset should be checked. Only when it is
971                  * non-zero, it is regarded as present.
972                  */
973                 if (p_child->addin_offset) {
974                         ret = 1;
975                         break;
976                 }
977         }
978         return ret;
979 }
980
981 /**
982  * intel_lvds_init - setup LVDS connectors on this device
983  * @dev: drm device
984  *
985  * Create the connector, register the LVDS DDC bus, and try to figure out what
986  * modes we can display on the LVDS panel (if present).
987  */
988 void intel_lvds_init(struct drm_device *dev)
989 {
990         struct drm_i915_private *dev_priv = dev->dev_private;
991         struct intel_output *intel_output;
992         struct drm_connector *connector;
993         struct drm_encoder *encoder;
994         struct drm_display_mode *scan; /* *modes, *bios_mode; */
995         struct drm_crtc *crtc;
996         struct intel_lvds_priv *lvds_priv;
997         u32 lvds;
998         int pipe, gpio = GPIOC;
999
1000         /* Skip init on machines we know falsely report LVDS */
1001         if (dmi_check_system(intel_no_lvds))
1002                 return;
1003
1004         if (!lvds_is_present_in_vbt(dev)) {
1005                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
1006                 return;
1007         }
1008
1009         if (IS_IRONLAKE(dev)) {
1010                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
1011                         return;
1012                 if (dev_priv->edp_support) {
1013                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
1014                         return;
1015                 }
1016                 gpio = PCH_GPIOC;
1017         }
1018
1019         intel_output = kzalloc(sizeof(struct intel_output) +
1020                                 sizeof(struct intel_lvds_priv), GFP_KERNEL);
1021         if (!intel_output) {
1022                 return;
1023         }
1024
1025         connector = &intel_output->base;
1026         encoder = &intel_output->enc;
1027         drm_connector_init(dev, &intel_output->base, &intel_lvds_connector_funcs,
1028                            DRM_MODE_CONNECTOR_LVDS);
1029
1030         drm_encoder_init(dev, &intel_output->enc, &intel_lvds_enc_funcs,
1031                          DRM_MODE_ENCODER_LVDS);
1032
1033         drm_mode_connector_attach_encoder(&intel_output->base, &intel_output->enc);
1034         intel_output->type = INTEL_OUTPUT_LVDS;
1035
1036         intel_output->clone_mask = (1 << INTEL_LVDS_CLONE_BIT);
1037         intel_output->crtc_mask = (1 << 1);
1038         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
1039         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
1040         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
1041         connector->interlace_allowed = false;
1042         connector->doublescan_allowed = false;
1043
1044         lvds_priv = (struct intel_lvds_priv *)(intel_output + 1);
1045         intel_output->dev_priv = lvds_priv;
1046         /* create the scaling mode property */
1047         drm_mode_create_scaling_mode_property(dev);
1048         /*
1049          * the initial panel fitting mode will be FULL_SCREEN.
1050          */
1051
1052         drm_connector_attach_property(&intel_output->base,
1053                                       dev->mode_config.scaling_mode_property,
1054                                       DRM_MODE_SCALE_FULLSCREEN);
1055         lvds_priv->fitting_mode = DRM_MODE_SCALE_FULLSCREEN;
1056         /*
1057          * LVDS discovery:
1058          * 1) check for EDID on DDC
1059          * 2) check for VBT data
1060          * 3) check to see if LVDS is already on
1061          *    if none of the above, no panel
1062          * 4) make sure lid is open
1063          *    if closed, act like it's not there for now
1064          */
1065
1066         /* Set up the DDC bus. */
1067         intel_output->ddc_bus = intel_i2c_create(dev, gpio, "LVDSDDC_C");
1068         if (!intel_output->ddc_bus) {
1069                 dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
1070                            "failed.\n");
1071                 goto failed;
1072         }
1073
1074         /*
1075          * Attempt to get the fixed panel mode from DDC.  Assume that the
1076          * preferred mode is the right one.
1077          */
1078         intel_ddc_get_modes(intel_output);
1079
1080         list_for_each_entry(scan, &connector->probed_modes, head) {
1081                 mutex_lock(&dev->mode_config.mutex);
1082                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
1083                         dev_priv->panel_fixed_mode =
1084                                 drm_mode_duplicate(dev, scan);
1085                         mutex_unlock(&dev->mode_config.mutex);
1086                         intel_find_lvds_downclock(dev, connector);
1087                         goto out;
1088                 }
1089                 mutex_unlock(&dev->mode_config.mutex);
1090         }
1091
1092         /* Failed to get EDID, what about VBT? */
1093         if (dev_priv->lfp_lvds_vbt_mode) {
1094                 mutex_lock(&dev->mode_config.mutex);
1095                 dev_priv->panel_fixed_mode =
1096                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
1097                 mutex_unlock(&dev->mode_config.mutex);
1098                 if (dev_priv->panel_fixed_mode) {
1099                         dev_priv->panel_fixed_mode->type |=
1100                                 DRM_MODE_TYPE_PREFERRED;
1101                         goto out;
1102                 }
1103         }
1104
1105         /*
1106          * If we didn't get EDID, try checking if the panel is already turned
1107          * on.  If so, assume that whatever is currently programmed is the
1108          * correct mode.
1109          */
1110
1111         /* Ironlake: FIXME if still fail, not try pipe mode now */
1112         if (IS_IRONLAKE(dev))
1113                 goto failed;
1114
1115         lvds = I915_READ(LVDS);
1116         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1117         crtc = intel_get_crtc_from_pipe(dev, pipe);
1118
1119         if (crtc && (lvds & LVDS_PORT_EN)) {
1120                 dev_priv->panel_fixed_mode = intel_crtc_mode_get(dev, crtc);
1121                 if (dev_priv->panel_fixed_mode) {
1122                         dev_priv->panel_fixed_mode->type |=
1123                                 DRM_MODE_TYPE_PREFERRED;
1124                         goto out;
1125                 }
1126         }
1127
1128         /* If we still don't have a mode after all that, give up. */
1129         if (!dev_priv->panel_fixed_mode)
1130                 goto failed;
1131
1132 out:
1133         if (IS_IRONLAKE(dev)) {
1134                 u32 pwm;
1135                 /* make sure PWM is enabled */
1136                 pwm = I915_READ(BLC_PWM_CPU_CTL2);
1137                 pwm |= (PWM_ENABLE | PWM_PIPE_B);
1138                 I915_WRITE(BLC_PWM_CPU_CTL2, pwm);
1139
1140                 pwm = I915_READ(BLC_PWM_PCH_CTL1);
1141                 pwm |= PWM_PCH_ENABLE;
1142                 I915_WRITE(BLC_PWM_PCH_CTL1, pwm);
1143         }
1144         dev_priv->lid_notifier.notifier_call = intel_lid_notify;
1145         if (acpi_lid_notifier_register(&dev_priv->lid_notifier)) {
1146                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1147                 dev_priv->lid_notifier.notifier_call = NULL;
1148         }
1149         /* keep the LVDS connector */
1150         dev_priv->int_lvds_connector = connector;
1151         drm_sysfs_connector_add(connector);
1152         return;
1153
1154 failed:
1155         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1156         if (intel_output->ddc_bus)
1157                 intel_i2c_destroy(intel_output->ddc_bus);
1158         drm_connector_cleanup(connector);
1159         drm_encoder_cleanup(encoder);
1160         kfree(intel_output);
1161 }