Merge branch 'drm-intel-fixes' into drm-intel-next
[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 <linux/slab.h>
34 #include "drmP.h"
35 #include "drm.h"
36 #include "drm_crtc.h"
37 #include "drm_edid.h"
38 #include "intel_drv.h"
39 #include "i915_drm.h"
40 #include "i915_drv.h"
41 #include <linux/acpi.h>
42
43 /* Private structure for the integrated LVDS support */
44 struct intel_lvds {
45         struct intel_encoder base;
46
47         struct edid *edid;
48
49         int fitting_mode;
50         u32 pfit_control;
51         u32 pfit_pgm_ratios;
52         bool pfit_dirty;
53
54         struct drm_display_mode *fixed_mode;
55 };
56
57 static struct intel_lvds *to_intel_lvds(struct drm_encoder *encoder)
58 {
59         return container_of(encoder, struct intel_lvds, base.base);
60 }
61
62 static struct intel_lvds *intel_attached_lvds(struct drm_connector *connector)
63 {
64         return container_of(intel_attached_encoder(connector),
65                             struct intel_lvds, base);
66 }
67
68 /**
69  * Sets the power state for the panel.
70  */
71 static void intel_lvds_set_power(struct intel_lvds *intel_lvds, bool on)
72 {
73         struct drm_device *dev = intel_lvds->base.base.dev;
74         struct drm_i915_private *dev_priv = dev->dev_private;
75         u32 ctl_reg, lvds_reg;
76
77         if (HAS_PCH_SPLIT(dev)) {
78                 ctl_reg = PCH_PP_CONTROL;
79                 lvds_reg = PCH_LVDS;
80         } else {
81                 ctl_reg = PP_CONTROL;
82                 lvds_reg = LVDS;
83         }
84
85         if (on) {
86                 I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
87                 I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
88                 intel_panel_set_backlight(dev, dev_priv->backlight_level);
89         } else {
90                 dev_priv->backlight_level = intel_panel_get_backlight(dev);
91
92                 intel_panel_set_backlight(dev, 0);
93                 I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
94
95                 if (intel_lvds->pfit_control) {
96                         if (wait_for((I915_READ(PP_STATUS) & PP_ON) == 0, 1000))
97                                 DRM_ERROR("timed out waiting for panel to power off\n");
98                         I915_WRITE(PFIT_CONTROL, 0);
99                         intel_lvds->pfit_control = 0;
100                         intel_lvds->pfit_dirty = false;
101                 }
102
103                 I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
104         }
105         POSTING_READ(lvds_reg);
106 }
107
108 static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)
109 {
110         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
111
112         if (mode == DRM_MODE_DPMS_ON)
113                 intel_lvds_set_power(intel_lvds, true);
114         else
115                 intel_lvds_set_power(intel_lvds, false);
116
117         /* XXX: We never power down the LVDS pairs. */
118 }
119
120 static int intel_lvds_mode_valid(struct drm_connector *connector,
121                                  struct drm_display_mode *mode)
122 {
123         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
124         struct drm_display_mode *fixed_mode = intel_lvds->fixed_mode;
125
126         if (mode->hdisplay > fixed_mode->hdisplay)
127                 return MODE_PANEL;
128         if (mode->vdisplay > fixed_mode->vdisplay)
129                 return MODE_PANEL;
130
131         return MODE_OK;
132 }
133
134 static void
135 centre_horizontally(struct drm_display_mode *mode,
136                     int width)
137 {
138         u32 border, sync_pos, blank_width, sync_width;
139
140         /* keep the hsync and hblank widths constant */
141         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
142         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
143         sync_pos = (blank_width - sync_width + 1) / 2;
144
145         border = (mode->hdisplay - width + 1) / 2;
146         border += border & 1; /* make the border even */
147
148         mode->crtc_hdisplay = width;
149         mode->crtc_hblank_start = width + border;
150         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
151
152         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
153         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
154 }
155
156 static void
157 centre_vertically(struct drm_display_mode *mode,
158                   int height)
159 {
160         u32 border, sync_pos, blank_width, sync_width;
161
162         /* keep the vsync and vblank widths constant */
163         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
164         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
165         sync_pos = (blank_width - sync_width + 1) / 2;
166
167         border = (mode->vdisplay - height + 1) / 2;
168
169         mode->crtc_vdisplay = height;
170         mode->crtc_vblank_start = height + border;
171         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
172
173         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
174         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
175 }
176
177 static inline u32 panel_fitter_scaling(u32 source, u32 target)
178 {
179         /*
180          * Floating point operation is not supported. So the FACTOR
181          * is defined, which can avoid the floating point computation
182          * when calculating the panel ratio.
183          */
184 #define ACCURACY 12
185 #define FACTOR (1 << ACCURACY)
186         u32 ratio = source * FACTOR / target;
187         return (FACTOR * ratio + FACTOR/2) / FACTOR;
188 }
189
190 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
191                                   struct drm_display_mode *mode,
192                                   struct drm_display_mode *adjusted_mode)
193 {
194         struct drm_device *dev = encoder->dev;
195         struct drm_i915_private *dev_priv = dev->dev_private;
196         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
197         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
198         struct drm_encoder *tmp_encoder;
199         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
200
201         /* Should never happen!! */
202         if (INTEL_INFO(dev)->gen < 4 && intel_crtc->pipe == 0) {
203                 DRM_ERROR("Can't support LVDS on pipe A\n");
204                 return false;
205         }
206
207         /* Should never happen!! */
208         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, head) {
209                 if (tmp_encoder != encoder && tmp_encoder->crtc == encoder->crtc) {
210                         DRM_ERROR("Can't enable LVDS and another "
211                                "encoder on the same pipe\n");
212                         return false;
213                 }
214         }
215
216         /*
217          * We have timings from the BIOS for the panel, put them in
218          * to the adjusted mode.  The CRTC will be set up for this mode,
219          * with the panel scaling set up to source from the H/VDisplay
220          * of the original mode.
221          */
222         intel_fixed_panel_mode(intel_lvds->fixed_mode, adjusted_mode);
223
224         if (HAS_PCH_SPLIT(dev)) {
225                 intel_pch_panel_fitting(dev, intel_lvds->fitting_mode,
226                                         mode, adjusted_mode);
227                 return true;
228         }
229
230         /* Make sure pre-965s set dither correctly */
231         if (INTEL_INFO(dev)->gen < 4) {
232                 if (dev_priv->lvds_dither)
233                         pfit_control |= PANEL_8TO6_DITHER_ENABLE;
234         }
235
236         /* Native modes don't need fitting */
237         if (adjusted_mode->hdisplay == mode->hdisplay &&
238             adjusted_mode->vdisplay == mode->vdisplay)
239                 goto out;
240
241         /* 965+ wants fuzzy fitting */
242         if (INTEL_INFO(dev)->gen >= 4)
243                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
244                                  PFIT_FILTER_FUZZY);
245
246         /*
247          * Enable automatic panel scaling for non-native modes so that they fill
248          * the screen.  Should be enabled before the pipe is enabled, according
249          * to register description and PRM.
250          * Change the value here to see the borders for debugging
251          */
252         I915_WRITE(BCLRPAT_A, 0);
253         I915_WRITE(BCLRPAT_B, 0);
254
255         switch (intel_lvds->fitting_mode) {
256         case DRM_MODE_SCALE_CENTER:
257                 /*
258                  * For centered modes, we have to calculate border widths &
259                  * heights and modify the values programmed into the CRTC.
260                  */
261                 centre_horizontally(adjusted_mode, mode->hdisplay);
262                 centre_vertically(adjusted_mode, mode->vdisplay);
263                 border = LVDS_BORDER_ENABLE;
264                 break;
265
266         case DRM_MODE_SCALE_ASPECT:
267                 /* Scale but preserve the aspect ratio */
268                 if (INTEL_INFO(dev)->gen >= 4) {
269                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
270                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
271
272                         /* 965+ is easy, it does everything in hw */
273                         if (scaled_width > scaled_height)
274                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_PILLAR;
275                         else if (scaled_width < scaled_height)
276                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_LETTER;
277                         else if (adjusted_mode->hdisplay != mode->hdisplay)
278                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
279                 } else {
280                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
281                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
282                         /*
283                          * For earlier chips we have to calculate the scaling
284                          * ratio by hand and program it into the
285                          * PFIT_PGM_RATIO register
286                          */
287                         if (scaled_width > scaled_height) { /* pillar */
288                                 centre_horizontally(adjusted_mode, scaled_height / mode->vdisplay);
289
290                                 border = LVDS_BORDER_ENABLE;
291                                 if (mode->vdisplay != adjusted_mode->vdisplay) {
292                                         u32 bits = panel_fitter_scaling(mode->vdisplay, adjusted_mode->vdisplay);
293                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
294                                                             bits << PFIT_VERT_SCALE_SHIFT);
295                                         pfit_control |= (PFIT_ENABLE |
296                                                          VERT_INTERP_BILINEAR |
297                                                          HORIZ_INTERP_BILINEAR);
298                                 }
299                         } else if (scaled_width < scaled_height) { /* letter */
300                                 centre_vertically(adjusted_mode, scaled_width / mode->hdisplay);
301
302                                 border = LVDS_BORDER_ENABLE;
303                                 if (mode->hdisplay != adjusted_mode->hdisplay) {
304                                         u32 bits = panel_fitter_scaling(mode->hdisplay, adjusted_mode->hdisplay);
305                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
306                                                             bits << PFIT_VERT_SCALE_SHIFT);
307                                         pfit_control |= (PFIT_ENABLE |
308                                                          VERT_INTERP_BILINEAR |
309                                                          HORIZ_INTERP_BILINEAR);
310                                 }
311                         } else
312                                 /* Aspects match, Let hw scale both directions */
313                                 pfit_control |= (PFIT_ENABLE |
314                                                  VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
315                                                  VERT_INTERP_BILINEAR |
316                                                  HORIZ_INTERP_BILINEAR);
317                 }
318                 break;
319
320         case DRM_MODE_SCALE_FULLSCREEN:
321                 /*
322                  * Full scaling, even if it changes the aspect ratio.
323                  * Fortunately this is all done for us in hw.
324                  */
325                 if (mode->vdisplay != adjusted_mode->vdisplay ||
326                     mode->hdisplay != adjusted_mode->hdisplay) {
327                         pfit_control |= PFIT_ENABLE;
328                         if (INTEL_INFO(dev)->gen >= 4)
329                                 pfit_control |= PFIT_SCALING_AUTO;
330                         else
331                                 pfit_control |= (VERT_AUTO_SCALE |
332                                                  VERT_INTERP_BILINEAR |
333                                                  HORIZ_AUTO_SCALE |
334                                                  HORIZ_INTERP_BILINEAR);
335                 }
336                 break;
337
338         default:
339                 break;
340         }
341
342 out:
343         if (pfit_control != intel_lvds->pfit_control ||
344             pfit_pgm_ratios != intel_lvds->pfit_pgm_ratios) {
345                 intel_lvds->pfit_control = pfit_control;
346                 intel_lvds->pfit_pgm_ratios = pfit_pgm_ratios;
347                 intel_lvds->pfit_dirty = true;
348         }
349         dev_priv->lvds_border_bits = border;
350
351         /*
352          * XXX: It would be nice to support lower refresh rates on the
353          * panels to reduce power consumption, and perhaps match the
354          * user's requested refresh rate.
355          */
356
357         return true;
358 }
359
360 static void intel_lvds_prepare(struct drm_encoder *encoder)
361 {
362         struct drm_device *dev = encoder->dev;
363         struct drm_i915_private *dev_priv = dev->dev_private;
364         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
365
366         dev_priv->backlight_level = intel_panel_get_backlight(dev);
367
368         /* We try to do the minimum that is necessary in order to unlock
369          * the registers for mode setting.
370          *
371          * On Ironlake, this is quite simple as we just set the unlock key
372          * and ignore all subtleties. (This may cause some issues...)
373          *
374          * Prior to Ironlake, we must disable the pipe if we want to adjust
375          * the panel fitter. However at all other times we can just reset
376          * the registers regardless.
377          */
378
379         if (HAS_PCH_SPLIT(dev)) {
380                 I915_WRITE(PCH_PP_CONTROL,
381                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
382         } else if (intel_lvds->pfit_dirty) {
383                 I915_WRITE(PP_CONTROL,
384                            (I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS)
385                            & ~POWER_TARGET_ON);
386         } else {
387                 I915_WRITE(PP_CONTROL,
388                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
389         }
390 }
391
392 static void intel_lvds_commit(struct drm_encoder *encoder)
393 {
394         struct drm_device *dev = encoder->dev;
395         struct drm_i915_private *dev_priv = dev->dev_private;
396         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
397
398         if (dev_priv->backlight_level == 0)
399                 dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
400
401         /* Undo any unlocking done in prepare to prevent accidental
402          * adjustment of the registers.
403          */
404         if (HAS_PCH_SPLIT(dev)) {
405                 u32 val = I915_READ(PCH_PP_CONTROL);
406                 if ((val & PANEL_UNLOCK_REGS) == PANEL_UNLOCK_REGS)
407                         I915_WRITE(PCH_PP_CONTROL, val & 0x3);
408         } else {
409                 u32 val = I915_READ(PP_CONTROL);
410                 if ((val & PANEL_UNLOCK_REGS) == PANEL_UNLOCK_REGS)
411                         I915_WRITE(PP_CONTROL, val & 0x3);
412         }
413
414         /* Always do a full power on as we do not know what state
415          * we were left in.
416          */
417         intel_lvds_set_power(intel_lvds, true);
418 }
419
420 static void intel_lvds_mode_set(struct drm_encoder *encoder,
421                                 struct drm_display_mode *mode,
422                                 struct drm_display_mode *adjusted_mode)
423 {
424         struct drm_device *dev = encoder->dev;
425         struct drm_i915_private *dev_priv = dev->dev_private;
426         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
427
428         /*
429          * The LVDS pin pair will already have been turned on in the
430          * intel_crtc_mode_set since it has a large impact on the DPLL
431          * settings.
432          */
433
434         if (HAS_PCH_SPLIT(dev))
435                 return;
436
437         if (!intel_lvds->pfit_dirty)
438                 return;
439
440         /*
441          * Enable automatic panel scaling so that non-native modes fill the
442          * screen.  Should be enabled before the pipe is enabled, according to
443          * register description and PRM.
444          */
445         DRM_DEBUG_KMS("applying panel-fitter: %x, %x\n",
446                       intel_lvds->pfit_control,
447                       intel_lvds->pfit_pgm_ratios);
448         if (wait_for((I915_READ(PP_STATUS) & PP_ON) == 0, 1000))
449                 DRM_ERROR("timed out waiting for panel to power off\n");
450
451         I915_WRITE(PFIT_PGM_RATIOS, intel_lvds->pfit_pgm_ratios);
452         I915_WRITE(PFIT_CONTROL, intel_lvds->pfit_control);
453         intel_lvds->pfit_dirty = false;
454 }
455
456 /**
457  * Detect the LVDS connection.
458  *
459  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
460  * connected and closed means disconnected.  We also send hotplug events as
461  * needed, using lid status notification from the input layer.
462  */
463 static enum drm_connector_status
464 intel_lvds_detect(struct drm_connector *connector, bool force)
465 {
466         struct drm_device *dev = connector->dev;
467         enum drm_connector_status status = connector_status_connected;
468
469         /* ACPI lid methods were generally unreliable in this generation, so
470          * don't even bother.
471          */
472         if (IS_GEN2(dev) || IS_GEN3(dev))
473                 return connector_status_connected;
474
475         return status;
476 }
477
478 /**
479  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
480  */
481 static int intel_lvds_get_modes(struct drm_connector *connector)
482 {
483         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
484         struct drm_device *dev = connector->dev;
485         struct drm_display_mode *mode;
486
487         if (intel_lvds->edid)
488                 return drm_add_edid_modes(connector, intel_lvds->edid);
489
490         mode = drm_mode_duplicate(dev, intel_lvds->fixed_mode);
491         if (mode == 0)
492                 return 0;
493
494         drm_mode_probed_add(connector, mode);
495         return 1;
496 }
497
498 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
499 {
500         DRM_DEBUG_KMS("Skipping forced modeset for %s\n", id->ident);
501         return 1;
502 }
503
504 /* The GPU hangs up on these systems if modeset is performed on LID open */
505 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
506         {
507                 .callback = intel_no_modeset_on_lid_dmi_callback,
508                 .ident = "Toshiba Tecra A11",
509                 .matches = {
510                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
511                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
512                 },
513         },
514
515         { }     /* terminating entry */
516 };
517
518 /*
519  * Lid events. Note the use of 'modeset_on_lid':
520  *  - we set it on lid close, and reset it on open
521  *  - we use it as a "only once" bit (ie we ignore
522  *    duplicate events where it was already properly
523  *    set/reset)
524  *  - the suspend/resume paths will also set it to
525  *    zero, since they restore the mode ("lid open").
526  */
527 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
528                             void *unused)
529 {
530         struct drm_i915_private *dev_priv =
531                 container_of(nb, struct drm_i915_private, lid_notifier);
532         struct drm_device *dev = dev_priv->dev;
533         struct drm_connector *connector = dev_priv->int_lvds_connector;
534
535         /*
536          * check and update the status of LVDS connector after receiving
537          * the LID nofication event.
538          */
539         if (connector)
540                 connector->status = connector->funcs->detect(connector,
541                                                              false);
542
543         /* Don't force modeset on machines where it causes a GPU lockup */
544         if (dmi_check_system(intel_no_modeset_on_lid))
545                 return NOTIFY_OK;
546         if (!acpi_lid_open()) {
547                 dev_priv->modeset_on_lid = 1;
548                 return NOTIFY_OK;
549         }
550
551         if (!dev_priv->modeset_on_lid)
552                 return NOTIFY_OK;
553
554         dev_priv->modeset_on_lid = 0;
555
556         mutex_lock(&dev->mode_config.mutex);
557         drm_helper_resume_force_mode(dev);
558         mutex_unlock(&dev->mode_config.mutex);
559
560         return NOTIFY_OK;
561 }
562
563 /**
564  * intel_lvds_destroy - unregister and free LVDS structures
565  * @connector: connector to free
566  *
567  * Unregister the DDC bus for this connector then free the driver private
568  * structure.
569  */
570 static void intel_lvds_destroy(struct drm_connector *connector)
571 {
572         struct drm_device *dev = connector->dev;
573         struct drm_i915_private *dev_priv = dev->dev_private;
574
575         if (dev_priv->lid_notifier.notifier_call)
576                 acpi_lid_notifier_unregister(&dev_priv->lid_notifier);
577         drm_sysfs_connector_remove(connector);
578         drm_connector_cleanup(connector);
579         kfree(connector);
580 }
581
582 static int intel_lvds_set_property(struct drm_connector *connector,
583                                    struct drm_property *property,
584                                    uint64_t value)
585 {
586         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
587         struct drm_device *dev = connector->dev;
588
589         if (property == dev->mode_config.scaling_mode_property) {
590                 struct drm_crtc *crtc = intel_lvds->base.base.crtc;
591
592                 if (value == DRM_MODE_SCALE_NONE) {
593                         DRM_DEBUG_KMS("no scaling not supported\n");
594                         return -EINVAL;
595                 }
596
597                 if (intel_lvds->fitting_mode == value) {
598                         /* the LVDS scaling property is not changed */
599                         return 0;
600                 }
601                 intel_lvds->fitting_mode = value;
602                 if (crtc && crtc->enabled) {
603                         /*
604                          * If the CRTC is enabled, the display will be changed
605                          * according to the new panel fitting mode.
606                          */
607                         drm_crtc_helper_set_mode(crtc, &crtc->mode,
608                                 crtc->x, crtc->y, crtc->fb);
609                 }
610         }
611
612         return 0;
613 }
614
615 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
616         .dpms = intel_lvds_dpms,
617         .mode_fixup = intel_lvds_mode_fixup,
618         .prepare = intel_lvds_prepare,
619         .mode_set = intel_lvds_mode_set,
620         .commit = intel_lvds_commit,
621 };
622
623 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
624         .get_modes = intel_lvds_get_modes,
625         .mode_valid = intel_lvds_mode_valid,
626         .best_encoder = intel_best_encoder,
627 };
628
629 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
630         .dpms = drm_helper_connector_dpms,
631         .detect = intel_lvds_detect,
632         .fill_modes = drm_helper_probe_single_connector_modes,
633         .set_property = intel_lvds_set_property,
634         .destroy = intel_lvds_destroy,
635 };
636
637 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
638         .destroy = intel_encoder_destroy,
639 };
640
641 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
642 {
643         DRM_DEBUG_KMS("Skipping LVDS initialization for %s\n", id->ident);
644         return 1;
645 }
646
647 /* These systems claim to have LVDS, but really don't */
648 static const struct dmi_system_id intel_no_lvds[] = {
649         {
650                 .callback = intel_no_lvds_dmi_callback,
651                 .ident = "Apple Mac Mini (Core series)",
652                 .matches = {
653                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
654                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
655                 },
656         },
657         {
658                 .callback = intel_no_lvds_dmi_callback,
659                 .ident = "Apple Mac Mini (Core 2 series)",
660                 .matches = {
661                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
662                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
663                 },
664         },
665         {
666                 .callback = intel_no_lvds_dmi_callback,
667                 .ident = "MSI IM-945GSE-A",
668                 .matches = {
669                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
670                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
671                 },
672         },
673         {
674                 .callback = intel_no_lvds_dmi_callback,
675                 .ident = "Dell Studio Hybrid",
676                 .matches = {
677                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
678                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
679                 },
680         },
681         {
682                 .callback = intel_no_lvds_dmi_callback,
683                 .ident = "AOpen Mini PC",
684                 .matches = {
685                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
686                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
687                 },
688         },
689         {
690                 .callback = intel_no_lvds_dmi_callback,
691                 .ident = "AOpen Mini PC MP915",
692                 .matches = {
693                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
694                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
695                 },
696         },
697         {
698                 .callback = intel_no_lvds_dmi_callback,
699                 .ident = "Aopen i945GTt-VFA",
700                 .matches = {
701                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
702                 },
703         },
704         {
705                 .callback = intel_no_lvds_dmi_callback,
706                 .ident = "Clientron U800",
707                 .matches = {
708                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
709                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
710                 },
711         },
712
713         { }     /* terminating entry */
714 };
715
716 /**
717  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
718  * @dev: drm device
719  * @connector: LVDS connector
720  *
721  * Find the reduced downclock for LVDS in EDID.
722  */
723 static void intel_find_lvds_downclock(struct drm_device *dev,
724                                       struct drm_display_mode *fixed_mode,
725                                       struct drm_connector *connector)
726 {
727         struct drm_i915_private *dev_priv = dev->dev_private;
728         struct drm_display_mode *scan;
729         int temp_downclock;
730
731         temp_downclock = fixed_mode->clock;
732         list_for_each_entry(scan, &connector->probed_modes, head) {
733                 /*
734                  * If one mode has the same resolution with the fixed_panel
735                  * mode while they have the different refresh rate, it means
736                  * that the reduced downclock is found for the LVDS. In such
737                  * case we can set the different FPx0/1 to dynamically select
738                  * between low and high frequency.
739                  */
740                 if (scan->hdisplay == fixed_mode->hdisplay &&
741                     scan->hsync_start == fixed_mode->hsync_start &&
742                     scan->hsync_end == fixed_mode->hsync_end &&
743                     scan->htotal == fixed_mode->htotal &&
744                     scan->vdisplay == fixed_mode->vdisplay &&
745                     scan->vsync_start == fixed_mode->vsync_start &&
746                     scan->vsync_end == fixed_mode->vsync_end &&
747                     scan->vtotal == fixed_mode->vtotal) {
748                         if (scan->clock < temp_downclock) {
749                                 /*
750                                  * The downclock is already found. But we
751                                  * expect to find the lower downclock.
752                                  */
753                                 temp_downclock = scan->clock;
754                         }
755                 }
756         }
757         if (temp_downclock < fixed_mode->clock && i915_lvds_downclock) {
758                 /* We found the downclock for LVDS. */
759                 dev_priv->lvds_downclock_avail = 1;
760                 dev_priv->lvds_downclock = temp_downclock;
761                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
762                               "Normal clock %dKhz, downclock %dKhz\n",
763                               fixed_mode->clock, temp_downclock);
764         }
765 }
766
767 /*
768  * Enumerate the child dev array parsed from VBT to check whether
769  * the LVDS is present.
770  * If it is present, return 1.
771  * If it is not present, return false.
772  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
773  */
774 static bool lvds_is_present_in_vbt(struct drm_device *dev,
775                                    u8 *i2c_pin)
776 {
777         struct drm_i915_private *dev_priv = dev->dev_private;
778         int i;
779
780         if (!dev_priv->child_dev_num)
781                 return true;
782
783         for (i = 0; i < dev_priv->child_dev_num; i++) {
784                 struct child_device_config *child = dev_priv->child_dev + i;
785
786                 /* If the device type is not LFP, continue.
787                  * We have to check both the new identifiers as well as the
788                  * old for compatibility with some BIOSes.
789                  */
790                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
791                     child->device_type != DEVICE_TYPE_LFP)
792                         continue;
793
794                 if (child->i2c_pin)
795                     *i2c_pin = child->i2c_pin;
796
797                 /* However, we cannot trust the BIOS writers to populate
798                  * the VBT correctly.  Since LVDS requires additional
799                  * information from AIM blocks, a non-zero addin offset is
800                  * a good indicator that the LVDS is actually present.
801                  */
802                 if (child->addin_offset)
803                         return true;
804
805                 /* But even then some BIOS writers perform some black magic
806                  * and instantiate the device without reference to any
807                  * additional data.  Trust that if the VBT was written into
808                  * the OpRegion then they have validated the LVDS's existence.
809                  */
810                 if (dev_priv->opregion.vbt)
811                         return true;
812         }
813
814         return false;
815 }
816
817 static bool intel_lvds_ddc_probe(struct drm_device *dev, u8 pin)
818 {
819         struct drm_i915_private *dev_priv = dev->dev_private;
820         u8 buf = 0;
821         struct i2c_msg msgs[] = {
822                 {
823                         .addr = 0xA0,
824                         .flags = 0,
825                         .len = 1,
826                         .buf = &buf,
827                 },
828         };
829         struct i2c_adapter *i2c = &dev_priv->gmbus[pin].adapter;
830         /* XXX this only appears to work when using GMBUS */
831         if (intel_gmbus_is_forced_bit(i2c))
832                 return true;
833         return i2c_transfer(i2c, msgs, 1) == 1;
834 }
835
836 /**
837  * intel_lvds_init - setup LVDS connectors on this device
838  * @dev: drm device
839  *
840  * Create the connector, register the LVDS DDC bus, and try to figure out what
841  * modes we can display on the LVDS panel (if present).
842  */
843 bool intel_lvds_init(struct drm_device *dev)
844 {
845         struct drm_i915_private *dev_priv = dev->dev_private;
846         struct intel_lvds *intel_lvds;
847         struct intel_encoder *intel_encoder;
848         struct intel_connector *intel_connector;
849         struct drm_connector *connector;
850         struct drm_encoder *encoder;
851         struct drm_display_mode *scan; /* *modes, *bios_mode; */
852         struct drm_crtc *crtc;
853         u32 lvds;
854         int pipe;
855         u8 pin;
856
857         /* Skip init on machines we know falsely report LVDS */
858         if (dmi_check_system(intel_no_lvds))
859                 return false;
860
861         pin = GMBUS_PORT_PANEL;
862         if (!lvds_is_present_in_vbt(dev, &pin)) {
863                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
864                 return false;
865         }
866
867         if (HAS_PCH_SPLIT(dev)) {
868                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
869                         return false;
870                 if (dev_priv->edp.support) {
871                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
872                         return false;
873                 }
874         }
875
876         if (!intel_lvds_ddc_probe(dev, pin)) {
877                 DRM_DEBUG_KMS("LVDS did not respond to DDC probe\n");
878                 return false;
879         }
880
881         intel_lvds = kzalloc(sizeof(struct intel_lvds), GFP_KERNEL);
882         if (!intel_lvds) {
883                 return false;
884         }
885
886         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
887         if (!intel_connector) {
888                 kfree(intel_lvds);
889                 return false;
890         }
891
892         if (!HAS_PCH_SPLIT(dev)) {
893                 intel_lvds->pfit_control = I915_READ(PFIT_CONTROL);
894         }
895
896         intel_encoder = &intel_lvds->base;
897         encoder = &intel_encoder->base;
898         connector = &intel_connector->base;
899         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
900                            DRM_MODE_CONNECTOR_LVDS);
901
902         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
903                          DRM_MODE_ENCODER_LVDS);
904
905         intel_connector_attach_encoder(intel_connector, intel_encoder);
906         intel_encoder->type = INTEL_OUTPUT_LVDS;
907
908         intel_encoder->clone_mask = (1 << INTEL_LVDS_CLONE_BIT);
909         intel_encoder->crtc_mask = (1 << 1);
910         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
911         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
912         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
913         connector->interlace_allowed = false;
914         connector->doublescan_allowed = false;
915
916         /* create the scaling mode property */
917         drm_mode_create_scaling_mode_property(dev);
918         /*
919          * the initial panel fitting mode will be FULL_SCREEN.
920          */
921
922         drm_connector_attach_property(&intel_connector->base,
923                                       dev->mode_config.scaling_mode_property,
924                                       DRM_MODE_SCALE_ASPECT);
925         intel_lvds->fitting_mode = DRM_MODE_SCALE_ASPECT;
926         /*
927          * LVDS discovery:
928          * 1) check for EDID on DDC
929          * 2) check for VBT data
930          * 3) check to see if LVDS is already on
931          *    if none of the above, no panel
932          * 4) make sure lid is open
933          *    if closed, act like it's not there for now
934          */
935
936         /*
937          * Attempt to get the fixed panel mode from DDC.  Assume that the
938          * preferred mode is the right one.
939          */
940         intel_lvds->edid = drm_get_edid(connector,
941                                         &dev_priv->gmbus[pin].adapter);
942         if (intel_lvds->edid) {
943                 if (drm_add_edid_modes(connector,
944                                        intel_lvds->edid)) {
945                         drm_mode_connector_update_edid_property(connector,
946                                                                 intel_lvds->edid);
947                 } else {
948                         kfree(intel_lvds->edid);
949                         intel_lvds->edid = NULL;
950                 }
951         }
952         if (!intel_lvds->edid) {
953                 /* Didn't get an EDID, so
954                  * Set wide sync ranges so we get all modes
955                  * handed to valid_mode for checking
956                  */
957                 connector->display_info.min_vfreq = 0;
958                 connector->display_info.max_vfreq = 200;
959                 connector->display_info.min_hfreq = 0;
960                 connector->display_info.max_hfreq = 200;
961         }
962
963         list_for_each_entry(scan, &connector->probed_modes, head) {
964                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
965                         intel_lvds->fixed_mode =
966                                 drm_mode_duplicate(dev, scan);
967                         intel_find_lvds_downclock(dev,
968                                                   intel_lvds->fixed_mode,
969                                                   connector);
970                         goto out;
971                 }
972         }
973
974         /* Failed to get EDID, what about VBT? */
975         if (dev_priv->lfp_lvds_vbt_mode) {
976                 intel_lvds->fixed_mode =
977                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
978                 if (intel_lvds->fixed_mode) {
979                         intel_lvds->fixed_mode->type |=
980                                 DRM_MODE_TYPE_PREFERRED;
981                         goto out;
982                 }
983         }
984
985         /*
986          * If we didn't get EDID, try checking if the panel is already turned
987          * on.  If so, assume that whatever is currently programmed is the
988          * correct mode.
989          */
990
991         /* Ironlake: FIXME if still fail, not try pipe mode now */
992         if (HAS_PCH_SPLIT(dev))
993                 goto failed;
994
995         lvds = I915_READ(LVDS);
996         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
997         crtc = intel_get_crtc_for_pipe(dev, pipe);
998
999         if (crtc && (lvds & LVDS_PORT_EN)) {
1000                 intel_lvds->fixed_mode = intel_crtc_mode_get(dev, crtc);
1001                 if (intel_lvds->fixed_mode) {
1002                         intel_lvds->fixed_mode->type |=
1003                                 DRM_MODE_TYPE_PREFERRED;
1004                         goto out;
1005                 }
1006         }
1007
1008         /* If we still don't have a mode after all that, give up. */
1009         if (!intel_lvds->fixed_mode)
1010                 goto failed;
1011
1012 out:
1013         if (HAS_PCH_SPLIT(dev)) {
1014                 u32 pwm;
1015                 /* make sure PWM is enabled */
1016                 pwm = I915_READ(BLC_PWM_CPU_CTL2);
1017                 pwm |= (PWM_ENABLE | PWM_PIPE_B);
1018                 I915_WRITE(BLC_PWM_CPU_CTL2, pwm);
1019
1020                 pwm = I915_READ(BLC_PWM_PCH_CTL1);
1021                 pwm |= PWM_PCH_ENABLE;
1022                 I915_WRITE(BLC_PWM_PCH_CTL1, pwm);
1023         }
1024         dev_priv->lid_notifier.notifier_call = intel_lid_notify;
1025         if (acpi_lid_notifier_register(&dev_priv->lid_notifier)) {
1026                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1027                 dev_priv->lid_notifier.notifier_call = NULL;
1028         }
1029         /* keep the LVDS connector */
1030         dev_priv->int_lvds_connector = connector;
1031         drm_sysfs_connector_add(connector);
1032         return true;
1033
1034 failed:
1035         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1036         drm_connector_cleanup(connector);
1037         drm_encoder_cleanup(encoder);
1038         kfree(intel_lvds);
1039         kfree(intel_connector);
1040         return false;
1041 }