drm/i915: Remove dead KMS encoder save/restore code.
[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 (HAS_PCH_SPLIT(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 (HAS_PCH_SPLIT(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, lvds_reg;
93
94         if (HAS_PCH_SPLIT(dev)) {
95                 ctl_reg = PCH_PP_CONTROL;
96                 status_reg = PCH_PP_STATUS;
97                 lvds_reg = PCH_LVDS;
98         } else {
99                 ctl_reg = PP_CONTROL;
100                 status_reg = PP_STATUS;
101                 lvds_reg = LVDS;
102         }
103
104         if (on) {
105                 I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
106                 POSTING_READ(lvds_reg);
107
108                 I915_WRITE(ctl_reg, I915_READ(ctl_reg) |
109                            POWER_TARGET_ON);
110                 do {
111                         pp_status = I915_READ(status_reg);
112                 } while ((pp_status & PP_ON) == 0);
113
114                 intel_lvds_set_backlight(dev, dev_priv->backlight_duty_cycle);
115         } else {
116                 intel_lvds_set_backlight(dev, 0);
117
118                 I915_WRITE(ctl_reg, I915_READ(ctl_reg) &
119                            ~POWER_TARGET_ON);
120                 do {
121                         pp_status = I915_READ(status_reg);
122                 } while (pp_status & PP_ON);
123
124                 I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
125                 POSTING_READ(lvds_reg);
126         }
127 }
128
129 static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)
130 {
131         struct drm_device *dev = encoder->dev;
132
133         if (mode == DRM_MODE_DPMS_ON)
134                 intel_lvds_set_power(dev, true);
135         else
136                 intel_lvds_set_power(dev, false);
137
138         /* XXX: We never power down the LVDS pairs. */
139 }
140
141 static int intel_lvds_mode_valid(struct drm_connector *connector,
142                                  struct drm_display_mode *mode)
143 {
144         struct drm_device *dev = connector->dev;
145         struct drm_i915_private *dev_priv = dev->dev_private;
146         struct drm_display_mode *fixed_mode = dev_priv->panel_fixed_mode;
147
148         if (fixed_mode) {
149                 if (mode->hdisplay > fixed_mode->hdisplay)
150                         return MODE_PANEL;
151                 if (mode->vdisplay > fixed_mode->vdisplay)
152                         return MODE_PANEL;
153         }
154
155         return MODE_OK;
156 }
157
158 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
159                                   struct drm_display_mode *mode,
160                                   struct drm_display_mode *adjusted_mode)
161 {
162         /*
163          * float point operation is not supported . So the PANEL_RATIO_FACTOR
164          * is defined, which can avoid the float point computation when
165          * calculating the panel ratio.
166          */
167 #define PANEL_RATIO_FACTOR 8192
168         struct drm_device *dev = encoder->dev;
169         struct drm_i915_private *dev_priv = dev->dev_private;
170         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
171         struct drm_encoder *tmp_encoder;
172         struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
173         struct intel_lvds_priv *lvds_priv = intel_encoder->dev_priv;
174         u32 pfit_control = 0, pfit_pgm_ratios = 0;
175         int left_border = 0, right_border = 0, top_border = 0;
176         int bottom_border = 0;
177         bool border = 0;
178         int panel_ratio, desired_ratio, vert_scale, horiz_scale;
179         int horiz_ratio, vert_ratio;
180         u32 hsync_width, vsync_width;
181         u32 hblank_width, vblank_width;
182         u32 hsync_pos, vsync_pos;
183
184         /* Should never happen!! */
185         if (!IS_I965G(dev) && intel_crtc->pipe == 0) {
186                 DRM_ERROR("Can't support LVDS on pipe A\n");
187                 return false;
188         }
189
190         /* Should never happen!! */
191         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, head) {
192                 if (tmp_encoder != encoder && tmp_encoder->crtc == encoder->crtc) {
193                         DRM_ERROR("Can't enable LVDS and another "
194                                "encoder on the same pipe\n");
195                         return false;
196                 }
197         }
198         /* If we don't have a panel mode, there is nothing we can do */
199         if (dev_priv->panel_fixed_mode == NULL)
200                 return true;
201         /*
202          * If we have timings from the BIOS for the panel, put them in
203          * to the adjusted mode.  The CRTC will be set up for this mode,
204          * with the panel scaling set up to source from the H/VDisplay
205          * of the original mode.
206          */
207         if (dev_priv->panel_fixed_mode != NULL) {
208                 adjusted_mode->hdisplay = dev_priv->panel_fixed_mode->hdisplay;
209                 adjusted_mode->hsync_start =
210                         dev_priv->panel_fixed_mode->hsync_start;
211                 adjusted_mode->hsync_end =
212                         dev_priv->panel_fixed_mode->hsync_end;
213                 adjusted_mode->htotal = dev_priv->panel_fixed_mode->htotal;
214                 adjusted_mode->vdisplay = dev_priv->panel_fixed_mode->vdisplay;
215                 adjusted_mode->vsync_start =
216                         dev_priv->panel_fixed_mode->vsync_start;
217                 adjusted_mode->vsync_end =
218                         dev_priv->panel_fixed_mode->vsync_end;
219                 adjusted_mode->vtotal = dev_priv->panel_fixed_mode->vtotal;
220                 adjusted_mode->clock = dev_priv->panel_fixed_mode->clock;
221                 drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);
222         }
223
224         /* Make sure pre-965s set dither correctly */
225         if (!IS_I965G(dev)) {
226                 if (dev_priv->panel_wants_dither || dev_priv->lvds_dither)
227                         pfit_control |= PANEL_8TO6_DITHER_ENABLE;
228         }
229
230         /* Native modes don't need fitting */
231         if (adjusted_mode->hdisplay == mode->hdisplay &&
232                         adjusted_mode->vdisplay == mode->vdisplay) {
233                 pfit_pgm_ratios = 0;
234                 border = 0;
235                 goto out;
236         }
237
238         /* full screen scale for now */
239         if (HAS_PCH_SPLIT(dev))
240                 goto out;
241
242         /* 965+ wants fuzzy fitting */
243         if (IS_I965G(dev))
244                 pfit_control |= (intel_crtc->pipe << PFIT_PIPE_SHIFT) |
245                                         PFIT_FILTER_FUZZY;
246
247         hsync_width = adjusted_mode->crtc_hsync_end -
248                                         adjusted_mode->crtc_hsync_start;
249         vsync_width = adjusted_mode->crtc_vsync_end -
250                                         adjusted_mode->crtc_vsync_start;
251         hblank_width = adjusted_mode->crtc_hblank_end -
252                                         adjusted_mode->crtc_hblank_start;
253         vblank_width = adjusted_mode->crtc_vblank_end -
254                                         adjusted_mode->crtc_vblank_start;
255         /*
256          * Deal with panel fitting options. Figure out how to stretch the
257          * image based on its aspect ratio & the current panel fitting mode.
258          */
259         panel_ratio = adjusted_mode->hdisplay * PANEL_RATIO_FACTOR /
260                                 adjusted_mode->vdisplay;
261         desired_ratio = mode->hdisplay * PANEL_RATIO_FACTOR /
262                                 mode->vdisplay;
263         /*
264          * Enable automatic panel scaling for non-native modes so that they fill
265          * the screen.  Should be enabled before the pipe is enabled, according
266          * to register description and PRM.
267          * Change the value here to see the borders for debugging
268          */
269         if (!HAS_PCH_SPLIT(dev)) {
270                 I915_WRITE(BCLRPAT_A, 0);
271                 I915_WRITE(BCLRPAT_B, 0);
272         }
273
274         switch (lvds_priv->fitting_mode) {
275         case DRM_MODE_SCALE_CENTER:
276                 /*
277                  * For centered modes, we have to calculate border widths &
278                  * heights and modify the values programmed into the CRTC.
279                  */
280                 left_border = (adjusted_mode->hdisplay - mode->hdisplay) / 2;
281                 right_border = left_border;
282                 if (mode->hdisplay & 1)
283                         right_border++;
284                 top_border = (adjusted_mode->vdisplay - mode->vdisplay) / 2;
285                 bottom_border = top_border;
286                 if (mode->vdisplay & 1)
287                         bottom_border++;
288                 /* Set active & border values */
289                 adjusted_mode->crtc_hdisplay = mode->hdisplay;
290                 /* Keep the boder be even */
291                 if (right_border & 1)
292                         right_border++;
293                 /* use the border directly instead of border minuse one */
294                 adjusted_mode->crtc_hblank_start = mode->hdisplay +
295                                                 right_border;
296                 /* keep the blank width constant */
297                 adjusted_mode->crtc_hblank_end =
298                         adjusted_mode->crtc_hblank_start + hblank_width;
299                 /* get the hsync pos relative to hblank start */
300                 hsync_pos = (hblank_width - hsync_width) / 2;
301                 /* keep the hsync pos be even */
302                 if (hsync_pos & 1)
303                         hsync_pos++;
304                 adjusted_mode->crtc_hsync_start =
305                                 adjusted_mode->crtc_hblank_start + hsync_pos;
306                 /* keep the hsync width constant */
307                 adjusted_mode->crtc_hsync_end =
308                                 adjusted_mode->crtc_hsync_start + hsync_width;
309                 adjusted_mode->crtc_vdisplay = mode->vdisplay;
310                 /* use the border instead of border minus one */
311                 adjusted_mode->crtc_vblank_start = mode->vdisplay +
312                                                 bottom_border;
313                 /* keep the vblank width constant */
314                 adjusted_mode->crtc_vblank_end =
315                                 adjusted_mode->crtc_vblank_start + vblank_width;
316                 /* get the vsync start postion relative to vblank start */
317                 vsync_pos = (vblank_width - vsync_width) / 2;
318                 adjusted_mode->crtc_vsync_start =
319                                 adjusted_mode->crtc_vblank_start + vsync_pos;
320                 /* keep the vsync width constant */
321                 adjusted_mode->crtc_vsync_end =
322                                 adjusted_mode->crtc_vsync_start + vsync_width;
323                 border = 1;
324                 break;
325         case DRM_MODE_SCALE_ASPECT:
326                 /* Scale but preserve the spect ratio */
327                 pfit_control |= PFIT_ENABLE;
328                 if (IS_I965G(dev)) {
329                         /* 965+ is easy, it does everything in hw */
330                         if (panel_ratio > desired_ratio)
331                                 pfit_control |= PFIT_SCALING_PILLAR;
332                         else if (panel_ratio < desired_ratio)
333                                 pfit_control |= PFIT_SCALING_LETTER;
334                         else
335                                 pfit_control |= PFIT_SCALING_AUTO;
336                 } else {
337                         /*
338                          * For earlier chips we have to calculate the scaling
339                          * ratio by hand and program it into the
340                          * PFIT_PGM_RATIO register
341                          */
342                         u32 horiz_bits, vert_bits, bits = 12;
343                         horiz_ratio = mode->hdisplay * PANEL_RATIO_FACTOR/
344                                                 adjusted_mode->hdisplay;
345                         vert_ratio = mode->vdisplay * PANEL_RATIO_FACTOR/
346                                                 adjusted_mode->vdisplay;
347                         horiz_scale = adjusted_mode->hdisplay *
348                                         PANEL_RATIO_FACTOR / mode->hdisplay;
349                         vert_scale = adjusted_mode->vdisplay *
350                                         PANEL_RATIO_FACTOR / mode->vdisplay;
351
352                         /* retain aspect ratio */
353                         if (panel_ratio > desired_ratio) { /* Pillar */
354                                 u32 scaled_width;
355                                 scaled_width = mode->hdisplay * vert_scale /
356                                                 PANEL_RATIO_FACTOR;
357                                 horiz_ratio = vert_ratio;
358                                 pfit_control |= (VERT_AUTO_SCALE |
359                                                  VERT_INTERP_BILINEAR |
360                                                  HORIZ_INTERP_BILINEAR);
361                                 /* Pillar will have left/right borders */
362                                 left_border = (adjusted_mode->hdisplay -
363                                                 scaled_width) / 2;
364                                 right_border = left_border;
365                                 if (mode->hdisplay & 1) /* odd resolutions */
366                                         right_border++;
367                                 /* keep the border be even */
368                                 if (right_border & 1)
369                                         right_border++;
370                                 adjusted_mode->crtc_hdisplay = scaled_width;
371                                 /* use border instead of border minus one */
372                                 adjusted_mode->crtc_hblank_start =
373                                         scaled_width + right_border;
374                                 /* keep the hblank width constant */
375                                 adjusted_mode->crtc_hblank_end =
376                                         adjusted_mode->crtc_hblank_start +
377                                                         hblank_width;
378                                 /*
379                                  * get the hsync start pos relative to
380                                  * hblank start
381                                  */
382                                 hsync_pos = (hblank_width - hsync_width) / 2;
383                                 /* keep the hsync_pos be even */
384                                 if (hsync_pos & 1)
385                                         hsync_pos++;
386                                 adjusted_mode->crtc_hsync_start =
387                                         adjusted_mode->crtc_hblank_start +
388                                                         hsync_pos;
389                                 /* keept hsync width constant */
390                                 adjusted_mode->crtc_hsync_end =
391                                         adjusted_mode->crtc_hsync_start +
392                                                         hsync_width;
393                                 border = 1;
394                         } else if (panel_ratio < desired_ratio) { /* letter */
395                                 u32 scaled_height = mode->vdisplay *
396                                         horiz_scale / PANEL_RATIO_FACTOR;
397                                 vert_ratio = horiz_ratio;
398                                 pfit_control |= (HORIZ_AUTO_SCALE |
399                                                  VERT_INTERP_BILINEAR |
400                                                  HORIZ_INTERP_BILINEAR);
401                                 /* Letterbox will have top/bottom border */
402                                 top_border = (adjusted_mode->vdisplay -
403                                         scaled_height) / 2;
404                                 bottom_border = top_border;
405                                 if (mode->vdisplay & 1)
406                                         bottom_border++;
407                                 adjusted_mode->crtc_vdisplay = scaled_height;
408                                 /* use border instead of border minus one */
409                                 adjusted_mode->crtc_vblank_start =
410                                         scaled_height + bottom_border;
411                                 /* keep the vblank width constant */
412                                 adjusted_mode->crtc_vblank_end =
413                                         adjusted_mode->crtc_vblank_start +
414                                                         vblank_width;
415                                 /*
416                                  * get the vsync start pos relative to
417                                  * vblank start
418                                  */
419                                 vsync_pos = (vblank_width - vsync_width) / 2;
420                                 adjusted_mode->crtc_vsync_start =
421                                         adjusted_mode->crtc_vblank_start +
422                                                         vsync_pos;
423                                 /* keep the vsync width constant */
424                                 adjusted_mode->crtc_vsync_end =
425                                         adjusted_mode->crtc_vsync_start +
426                                                         vsync_width;
427                                 border = 1;
428                         } else {
429                         /* Aspects match, Let hw scale both directions */
430                                 pfit_control |= (VERT_AUTO_SCALE |
431                                                  HORIZ_AUTO_SCALE |
432                                                  VERT_INTERP_BILINEAR |
433                                                  HORIZ_INTERP_BILINEAR);
434                         }
435                         horiz_bits = (1 << bits) * horiz_ratio /
436                                         PANEL_RATIO_FACTOR;
437                         vert_bits = (1 << bits) * vert_ratio /
438                                         PANEL_RATIO_FACTOR;
439                         pfit_pgm_ratios =
440                                 ((vert_bits << PFIT_VERT_SCALE_SHIFT) &
441                                                 PFIT_VERT_SCALE_MASK) |
442                                 ((horiz_bits << PFIT_HORIZ_SCALE_SHIFT) &
443                                                 PFIT_HORIZ_SCALE_MASK);
444                 }
445                 break;
446
447         case DRM_MODE_SCALE_FULLSCREEN:
448                 /*
449                  * Full scaling, even if it changes the aspect ratio.
450                  * Fortunately this is all done for us in hw.
451                  */
452                 pfit_control |= PFIT_ENABLE;
453                 if (IS_I965G(dev))
454                         pfit_control |= PFIT_SCALING_AUTO;
455                 else
456                         pfit_control |= (VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
457                                          VERT_INTERP_BILINEAR |
458                                          HORIZ_INTERP_BILINEAR);
459                 break;
460         default:
461                 break;
462         }
463
464 out:
465         lvds_priv->pfit_control = pfit_control;
466         lvds_priv->pfit_pgm_ratios = pfit_pgm_ratios;
467         /*
468          * When there exists the border, it means that the LVDS_BORDR
469          * should be enabled.
470          */
471         if (border)
472                 dev_priv->lvds_border_bits |= LVDS_BORDER_ENABLE;
473         else
474                 dev_priv->lvds_border_bits &= ~(LVDS_BORDER_ENABLE);
475         /*
476          * XXX: It would be nice to support lower refresh rates on the
477          * panels to reduce power consumption, and perhaps match the
478          * user's requested refresh rate.
479          */
480
481         return true;
482 }
483
484 static void intel_lvds_prepare(struct drm_encoder *encoder)
485 {
486         struct drm_device *dev = encoder->dev;
487         struct drm_i915_private *dev_priv = dev->dev_private;
488         u32 reg;
489
490         if (HAS_PCH_SPLIT(dev))
491                 reg = BLC_PWM_CPU_CTL;
492         else
493                 reg = BLC_PWM_CTL;
494
495         dev_priv->saveBLC_PWM_CTL = I915_READ(reg);
496         dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
497                                        BACKLIGHT_DUTY_CYCLE_MASK);
498
499         intel_lvds_set_power(dev, false);
500 }
501
502 static void intel_lvds_commit( struct drm_encoder *encoder)
503 {
504         struct drm_device *dev = encoder->dev;
505         struct drm_i915_private *dev_priv = dev->dev_private;
506
507         if (dev_priv->backlight_duty_cycle == 0)
508                 dev_priv->backlight_duty_cycle =
509                         intel_lvds_get_max_backlight(dev);
510
511         intel_lvds_set_power(dev, true);
512 }
513
514 static void intel_lvds_mode_set(struct drm_encoder *encoder,
515                                 struct drm_display_mode *mode,
516                                 struct drm_display_mode *adjusted_mode)
517 {
518         struct drm_device *dev = encoder->dev;
519         struct drm_i915_private *dev_priv = dev->dev_private;
520         struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
521         struct intel_lvds_priv *lvds_priv = intel_encoder->dev_priv;
522
523         /*
524          * The LVDS pin pair will already have been turned on in the
525          * intel_crtc_mode_set since it has a large impact on the DPLL
526          * settings.
527          */
528
529         if (HAS_PCH_SPLIT(dev))
530                 return;
531
532         /*
533          * Enable automatic panel scaling so that non-native modes fill the
534          * screen.  Should be enabled before the pipe is enabled, according to
535          * register description and PRM.
536          */
537         I915_WRITE(PFIT_PGM_RATIOS, lvds_priv->pfit_pgm_ratios);
538         I915_WRITE(PFIT_CONTROL, lvds_priv->pfit_control);
539 }
540
541 /**
542  * Detect the LVDS connection.
543  *
544  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
545  * connected and closed means disconnected.  We also send hotplug events as
546  * needed, using lid status notification from the input layer.
547  */
548 static enum drm_connector_status intel_lvds_detect(struct drm_connector *connector)
549 {
550         struct drm_device *dev = connector->dev;
551         enum drm_connector_status status = connector_status_connected;
552
553         /* ACPI lid methods were generally unreliable in this generation, so
554          * don't even bother.
555          */
556         if (IS_GEN2(dev) || IS_GEN3(dev))
557                 return connector_status_connected;
558
559         return status;
560 }
561
562 /**
563  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
564  */
565 static int intel_lvds_get_modes(struct drm_connector *connector)
566 {
567         struct drm_device *dev = connector->dev;
568         struct intel_encoder *intel_encoder = to_intel_encoder(connector);
569         struct drm_i915_private *dev_priv = dev->dev_private;
570         int ret = 0;
571
572         if (dev_priv->lvds_edid_good) {
573                 ret = intel_ddc_get_modes(connector, intel_encoder->ddc_bus);
574
575                 if (ret)
576                         return ret;
577         }
578
579         /* Didn't get an EDID, so
580          * Set wide sync ranges so we get all modes
581          * handed to valid_mode for checking
582          */
583         connector->display_info.min_vfreq = 0;
584         connector->display_info.max_vfreq = 200;
585         connector->display_info.min_hfreq = 0;
586         connector->display_info.max_hfreq = 200;
587
588         if (dev_priv->panel_fixed_mode != NULL) {
589                 struct drm_display_mode *mode;
590
591                 mode = drm_mode_duplicate(dev, dev_priv->panel_fixed_mode);
592                 drm_mode_probed_add(connector, mode);
593
594                 return 1;
595         }
596
597         return 0;
598 }
599
600 /*
601  * Lid events. Note the use of 'modeset_on_lid':
602  *  - we set it on lid close, and reset it on open
603  *  - we use it as a "only once" bit (ie we ignore
604  *    duplicate events where it was already properly
605  *    set/reset)
606  *  - the suspend/resume paths will also set it to
607  *    zero, since they restore the mode ("lid open").
608  */
609 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
610                             void *unused)
611 {
612         struct drm_i915_private *dev_priv =
613                 container_of(nb, struct drm_i915_private, lid_notifier);
614         struct drm_device *dev = dev_priv->dev;
615         struct drm_connector *connector = dev_priv->int_lvds_connector;
616
617         /*
618          * check and update the status of LVDS connector after receiving
619          * the LID nofication event.
620          */
621         if (connector)
622                 connector->status = connector->funcs->detect(connector);
623         if (!acpi_lid_open()) {
624                 dev_priv->modeset_on_lid = 1;
625                 return NOTIFY_OK;
626         }
627
628         if (!dev_priv->modeset_on_lid)
629                 return NOTIFY_OK;
630
631         dev_priv->modeset_on_lid = 0;
632
633         mutex_lock(&dev->mode_config.mutex);
634         drm_helper_resume_force_mode(dev);
635         mutex_unlock(&dev->mode_config.mutex);
636
637         return NOTIFY_OK;
638 }
639
640 /**
641  * intel_lvds_destroy - unregister and free LVDS structures
642  * @connector: connector to free
643  *
644  * Unregister the DDC bus for this connector then free the driver private
645  * structure.
646  */
647 static void intel_lvds_destroy(struct drm_connector *connector)
648 {
649         struct drm_device *dev = connector->dev;
650         struct intel_encoder *intel_encoder = to_intel_encoder(connector);
651         struct drm_i915_private *dev_priv = dev->dev_private;
652
653         if (intel_encoder->ddc_bus)
654                 intel_i2c_destroy(intel_encoder->ddc_bus);
655         if (dev_priv->lid_notifier.notifier_call)
656                 acpi_lid_notifier_unregister(&dev_priv->lid_notifier);
657         drm_sysfs_connector_remove(connector);
658         drm_connector_cleanup(connector);
659         kfree(connector);
660 }
661
662 static int intel_lvds_set_property(struct drm_connector *connector,
663                                    struct drm_property *property,
664                                    uint64_t value)
665 {
666         struct drm_device *dev = connector->dev;
667         struct intel_encoder *intel_encoder =
668                         to_intel_encoder(connector);
669
670         if (property == dev->mode_config.scaling_mode_property &&
671                                 connector->encoder) {
672                 struct drm_crtc *crtc = connector->encoder->crtc;
673                 struct intel_lvds_priv *lvds_priv = intel_encoder->dev_priv;
674                 if (value == DRM_MODE_SCALE_NONE) {
675                         DRM_DEBUG_KMS("no scaling not supported\n");
676                         return 0;
677                 }
678                 if (lvds_priv->fitting_mode == value) {
679                         /* the LVDS scaling property is not changed */
680                         return 0;
681                 }
682                 lvds_priv->fitting_mode = value;
683                 if (crtc && crtc->enabled) {
684                         /*
685                          * If the CRTC is enabled, the display will be changed
686                          * according to the new panel fitting mode.
687                          */
688                         drm_crtc_helper_set_mode(crtc, &crtc->mode,
689                                 crtc->x, crtc->y, crtc->fb);
690                 }
691         }
692
693         return 0;
694 }
695
696 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
697         .dpms = intel_lvds_dpms,
698         .mode_fixup = intel_lvds_mode_fixup,
699         .prepare = intel_lvds_prepare,
700         .mode_set = intel_lvds_mode_set,
701         .commit = intel_lvds_commit,
702 };
703
704 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
705         .get_modes = intel_lvds_get_modes,
706         .mode_valid = intel_lvds_mode_valid,
707         .best_encoder = intel_best_encoder,
708 };
709
710 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
711         .dpms = drm_helper_connector_dpms,
712         .detect = intel_lvds_detect,
713         .fill_modes = drm_helper_probe_single_connector_modes,
714         .set_property = intel_lvds_set_property,
715         .destroy = intel_lvds_destroy,
716 };
717
718
719 static void intel_lvds_enc_destroy(struct drm_encoder *encoder)
720 {
721         drm_encoder_cleanup(encoder);
722 }
723
724 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
725         .destroy = intel_lvds_enc_destroy,
726 };
727
728 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
729 {
730         DRM_DEBUG_KMS("Skipping LVDS initialization for %s\n", id->ident);
731         return 1;
732 }
733
734 /* These systems claim to have LVDS, but really don't */
735 static const struct dmi_system_id intel_no_lvds[] = {
736         {
737                 .callback = intel_no_lvds_dmi_callback,
738                 .ident = "Apple Mac Mini (Core series)",
739                 .matches = {
740                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
741                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
742                 },
743         },
744         {
745                 .callback = intel_no_lvds_dmi_callback,
746                 .ident = "Apple Mac Mini (Core 2 series)",
747                 .matches = {
748                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
749                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
750                 },
751         },
752         {
753                 .callback = intel_no_lvds_dmi_callback,
754                 .ident = "MSI IM-945GSE-A",
755                 .matches = {
756                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
757                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
758                 },
759         },
760         {
761                 .callback = intel_no_lvds_dmi_callback,
762                 .ident = "Dell Studio Hybrid",
763                 .matches = {
764                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
765                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
766                 },
767         },
768         {
769                 .callback = intel_no_lvds_dmi_callback,
770                 .ident = "AOpen Mini PC",
771                 .matches = {
772                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
773                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
774                 },
775         },
776         {
777                 .callback = intel_no_lvds_dmi_callback,
778                 .ident = "AOpen Mini PC MP915",
779                 .matches = {
780                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
781                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
782                 },
783         },
784         {
785                 .callback = intel_no_lvds_dmi_callback,
786                 .ident = "Aopen i945GTt-VFA",
787                 .matches = {
788                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
789                 },
790         },
791         {
792                 .callback = intel_no_lvds_dmi_callback,
793                 .ident = "Clientron U800",
794                 .matches = {
795                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
796                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
797                 },
798         },
799
800         { }     /* terminating entry */
801 };
802
803 /**
804  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
805  * @dev: drm device
806  * @connector: LVDS connector
807  *
808  * Find the reduced downclock for LVDS in EDID.
809  */
810 static void intel_find_lvds_downclock(struct drm_device *dev,
811                                 struct drm_connector *connector)
812 {
813         struct drm_i915_private *dev_priv = dev->dev_private;
814         struct drm_display_mode *scan, *panel_fixed_mode;
815         int temp_downclock;
816
817         panel_fixed_mode = dev_priv->panel_fixed_mode;
818         temp_downclock = panel_fixed_mode->clock;
819
820         mutex_lock(&dev->mode_config.mutex);
821         list_for_each_entry(scan, &connector->probed_modes, head) {
822                 /*
823                  * If one mode has the same resolution with the fixed_panel
824                  * mode while they have the different refresh rate, it means
825                  * that the reduced downclock is found for the LVDS. In such
826                  * case we can set the different FPx0/1 to dynamically select
827                  * between low and high frequency.
828                  */
829                 if (scan->hdisplay == panel_fixed_mode->hdisplay &&
830                         scan->hsync_start == panel_fixed_mode->hsync_start &&
831                         scan->hsync_end == panel_fixed_mode->hsync_end &&
832                         scan->htotal == panel_fixed_mode->htotal &&
833                         scan->vdisplay == panel_fixed_mode->vdisplay &&
834                         scan->vsync_start == panel_fixed_mode->vsync_start &&
835                         scan->vsync_end == panel_fixed_mode->vsync_end &&
836                         scan->vtotal == panel_fixed_mode->vtotal) {
837                         if (scan->clock < temp_downclock) {
838                                 /*
839                                  * The downclock is already found. But we
840                                  * expect to find the lower downclock.
841                                  */
842                                 temp_downclock = scan->clock;
843                         }
844                 }
845         }
846         mutex_unlock(&dev->mode_config.mutex);
847         if (temp_downclock < panel_fixed_mode->clock &&
848             i915_lvds_downclock) {
849                 /* We found the downclock for LVDS. */
850                 dev_priv->lvds_downclock_avail = 1;
851                 dev_priv->lvds_downclock = temp_downclock;
852                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
853                                 "Normal clock %dKhz, downclock %dKhz\n",
854                                 panel_fixed_mode->clock, temp_downclock);
855         }
856         return;
857 }
858
859 /*
860  * Enumerate the child dev array parsed from VBT to check whether
861  * the LVDS is present.
862  * If it is present, return 1.
863  * If it is not present, return false.
864  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
865  * Note: The addin_offset should also be checked for LVDS panel.
866  * Only when it is non-zero, it is assumed that it is present.
867  */
868 static int lvds_is_present_in_vbt(struct drm_device *dev)
869 {
870         struct drm_i915_private *dev_priv = dev->dev_private;
871         struct child_device_config *p_child;
872         int i, ret;
873
874         if (!dev_priv->child_dev_num)
875                 return 1;
876
877         ret = 0;
878         for (i = 0; i < dev_priv->child_dev_num; i++) {
879                 p_child = dev_priv->child_dev + i;
880                 /*
881                  * If the device type is not LFP, continue.
882                  * If the device type is 0x22, it is also regarded as LFP.
883                  */
884                 if (p_child->device_type != DEVICE_TYPE_INT_LFP &&
885                         p_child->device_type != DEVICE_TYPE_LFP)
886                         continue;
887
888                 /* The addin_offset should be checked. Only when it is
889                  * non-zero, it is regarded as present.
890                  */
891                 if (p_child->addin_offset) {
892                         ret = 1;
893                         break;
894                 }
895         }
896         return ret;
897 }
898
899 /**
900  * intel_lvds_init - setup LVDS connectors on this device
901  * @dev: drm device
902  *
903  * Create the connector, register the LVDS DDC bus, and try to figure out what
904  * modes we can display on the LVDS panel (if present).
905  */
906 void intel_lvds_init(struct drm_device *dev)
907 {
908         struct drm_i915_private *dev_priv = dev->dev_private;
909         struct intel_encoder *intel_encoder;
910         struct drm_connector *connector;
911         struct drm_encoder *encoder;
912         struct drm_display_mode *scan; /* *modes, *bios_mode; */
913         struct drm_crtc *crtc;
914         struct intel_lvds_priv *lvds_priv;
915         u32 lvds;
916         int pipe, gpio = GPIOC;
917
918         /* Skip init on machines we know falsely report LVDS */
919         if (dmi_check_system(intel_no_lvds))
920                 return;
921
922         if (!lvds_is_present_in_vbt(dev)) {
923                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
924                 return;
925         }
926
927         if (HAS_PCH_SPLIT(dev)) {
928                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
929                         return;
930                 if (dev_priv->edp_support) {
931                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
932                         return;
933                 }
934                 gpio = PCH_GPIOC;
935         }
936
937         intel_encoder = kzalloc(sizeof(struct intel_encoder) +
938                                 sizeof(struct intel_lvds_priv), GFP_KERNEL);
939         if (!intel_encoder) {
940                 return;
941         }
942
943         connector = &intel_encoder->base;
944         encoder = &intel_encoder->enc;
945         drm_connector_init(dev, &intel_encoder->base, &intel_lvds_connector_funcs,
946                            DRM_MODE_CONNECTOR_LVDS);
947
948         drm_encoder_init(dev, &intel_encoder->enc, &intel_lvds_enc_funcs,
949                          DRM_MODE_ENCODER_LVDS);
950
951         drm_mode_connector_attach_encoder(&intel_encoder->base, &intel_encoder->enc);
952         intel_encoder->type = INTEL_OUTPUT_LVDS;
953
954         intel_encoder->clone_mask = (1 << INTEL_LVDS_CLONE_BIT);
955         intel_encoder->crtc_mask = (1 << 1);
956         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
957         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
958         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
959         connector->interlace_allowed = false;
960         connector->doublescan_allowed = false;
961
962         lvds_priv = (struct intel_lvds_priv *)(intel_encoder + 1);
963         intel_encoder->dev_priv = lvds_priv;
964         /* create the scaling mode property */
965         drm_mode_create_scaling_mode_property(dev);
966         /*
967          * the initial panel fitting mode will be FULL_SCREEN.
968          */
969
970         drm_connector_attach_property(&intel_encoder->base,
971                                       dev->mode_config.scaling_mode_property,
972                                       DRM_MODE_SCALE_FULLSCREEN);
973         lvds_priv->fitting_mode = DRM_MODE_SCALE_FULLSCREEN;
974         /*
975          * LVDS discovery:
976          * 1) check for EDID on DDC
977          * 2) check for VBT data
978          * 3) check to see if LVDS is already on
979          *    if none of the above, no panel
980          * 4) make sure lid is open
981          *    if closed, act like it's not there for now
982          */
983
984         /* Set up the DDC bus. */
985         intel_encoder->ddc_bus = intel_i2c_create(dev, gpio, "LVDSDDC_C");
986         if (!intel_encoder->ddc_bus) {
987                 dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
988                            "failed.\n");
989                 goto failed;
990         }
991
992         /*
993          * Attempt to get the fixed panel mode from DDC.  Assume that the
994          * preferred mode is the right one.
995          */
996         dev_priv->lvds_edid_good = true;
997
998         if (!intel_ddc_get_modes(connector, intel_encoder->ddc_bus))
999                 dev_priv->lvds_edid_good = false;
1000
1001         list_for_each_entry(scan, &connector->probed_modes, head) {
1002                 mutex_lock(&dev->mode_config.mutex);
1003                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
1004                         dev_priv->panel_fixed_mode =
1005                                 drm_mode_duplicate(dev, scan);
1006                         mutex_unlock(&dev->mode_config.mutex);
1007                         intel_find_lvds_downclock(dev, connector);
1008                         goto out;
1009                 }
1010                 mutex_unlock(&dev->mode_config.mutex);
1011         }
1012
1013         /* Failed to get EDID, what about VBT? */
1014         if (dev_priv->lfp_lvds_vbt_mode) {
1015                 mutex_lock(&dev->mode_config.mutex);
1016                 dev_priv->panel_fixed_mode =
1017                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
1018                 mutex_unlock(&dev->mode_config.mutex);
1019                 if (dev_priv->panel_fixed_mode) {
1020                         dev_priv->panel_fixed_mode->type |=
1021                                 DRM_MODE_TYPE_PREFERRED;
1022                         goto out;
1023                 }
1024         }
1025
1026         /*
1027          * If we didn't get EDID, try checking if the panel is already turned
1028          * on.  If so, assume that whatever is currently programmed is the
1029          * correct mode.
1030          */
1031
1032         /* Ironlake: FIXME if still fail, not try pipe mode now */
1033         if (HAS_PCH_SPLIT(dev))
1034                 goto failed;
1035
1036         lvds = I915_READ(LVDS);
1037         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1038         crtc = intel_get_crtc_from_pipe(dev, pipe);
1039
1040         if (crtc && (lvds & LVDS_PORT_EN)) {
1041                 dev_priv->panel_fixed_mode = intel_crtc_mode_get(dev, crtc);
1042                 if (dev_priv->panel_fixed_mode) {
1043                         dev_priv->panel_fixed_mode->type |=
1044                                 DRM_MODE_TYPE_PREFERRED;
1045                         goto out;
1046                 }
1047         }
1048
1049         /* If we still don't have a mode after all that, give up. */
1050         if (!dev_priv->panel_fixed_mode)
1051                 goto failed;
1052
1053 out:
1054         if (HAS_PCH_SPLIT(dev)) {
1055                 u32 pwm;
1056                 /* make sure PWM is enabled */
1057                 pwm = I915_READ(BLC_PWM_CPU_CTL2);
1058                 pwm |= (PWM_ENABLE | PWM_PIPE_B);
1059                 I915_WRITE(BLC_PWM_CPU_CTL2, pwm);
1060
1061                 pwm = I915_READ(BLC_PWM_PCH_CTL1);
1062                 pwm |= PWM_PCH_ENABLE;
1063                 I915_WRITE(BLC_PWM_PCH_CTL1, pwm);
1064         }
1065         dev_priv->lid_notifier.notifier_call = intel_lid_notify;
1066         if (acpi_lid_notifier_register(&dev_priv->lid_notifier)) {
1067                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1068                 dev_priv->lid_notifier.notifier_call = NULL;
1069         }
1070         /* keep the LVDS connector */
1071         dev_priv->int_lvds_connector = connector;
1072         drm_sysfs_connector_add(connector);
1073         return;
1074
1075 failed:
1076         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1077         if (intel_encoder->ddc_bus)
1078                 intel_i2c_destroy(intel_encoder->ddc_bus);
1079         drm_connector_cleanup(connector);
1080         drm_encoder_cleanup(encoder);
1081         kfree(intel_encoder);
1082 }