drm/i915/lvds: Always restore panel-fitter when enabling the LVDS
[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_enable(struct intel_lvds *intel_lvds)
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         I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
86
87         if (intel_lvds->pfit_dirty) {
88                 /*
89                  * Enable automatic panel scaling so that non-native modes
90                  * fill the screen.  The panel fitter should only be
91                  * adjusted whilst the pipe is disabled, according to
92                  * register description and PRM.
93                  */
94                 DRM_DEBUG_KMS("applying panel-fitter: %x, %x\n",
95                               intel_lvds->pfit_control,
96                               intel_lvds->pfit_pgm_ratios);
97                 if (wait_for((I915_READ(PP_STATUS) & PP_ON) == 0, 1000)) {
98                         DRM_ERROR("timed out waiting for panel to power off\n");
99                 } else {
100                         I915_WRITE(PFIT_PGM_RATIOS, intel_lvds->pfit_pgm_ratios);
101                         I915_WRITE(PFIT_CONTROL, intel_lvds->pfit_control);
102                         intel_lvds->pfit_dirty = false;
103                 }
104         }
105
106         I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
107         POSTING_READ(lvds_reg);
108
109         intel_panel_set_backlight(dev, dev_priv->backlight_level);
110 }
111
112 static void intel_lvds_disable(struct intel_lvds *intel_lvds)
113 {
114         struct drm_device *dev = intel_lvds->base.base.dev;
115         struct drm_i915_private *dev_priv = dev->dev_private;
116         u32 ctl_reg, lvds_reg;
117
118         if (HAS_PCH_SPLIT(dev)) {
119                 ctl_reg = PCH_PP_CONTROL;
120                 lvds_reg = PCH_LVDS;
121         } else {
122                 ctl_reg = PP_CONTROL;
123                 lvds_reg = LVDS;
124         }
125
126         dev_priv->backlight_level = intel_panel_get_backlight(dev);
127         intel_panel_set_backlight(dev, 0);
128
129         I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
130
131         if (intel_lvds->pfit_control) {
132                 if (wait_for((I915_READ(PP_STATUS) & PP_ON) == 0, 1000))
133                         DRM_ERROR("timed out waiting for panel to power off\n");
134
135                 I915_WRITE(PFIT_CONTROL, 0);
136                 intel_lvds->pfit_dirty = true;
137         }
138
139         I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
140         POSTING_READ(lvds_reg);
141 }
142
143 static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)
144 {
145         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
146
147         if (mode == DRM_MODE_DPMS_ON)
148                 intel_lvds_enable(intel_lvds);
149         else
150                 intel_lvds_disable(intel_lvds);
151
152         /* XXX: We never power down the LVDS pairs. */
153 }
154
155 static int intel_lvds_mode_valid(struct drm_connector *connector,
156                                  struct drm_display_mode *mode)
157 {
158         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
159         struct drm_display_mode *fixed_mode = intel_lvds->fixed_mode;
160
161         if (mode->hdisplay > fixed_mode->hdisplay)
162                 return MODE_PANEL;
163         if (mode->vdisplay > fixed_mode->vdisplay)
164                 return MODE_PANEL;
165
166         return MODE_OK;
167 }
168
169 static void
170 centre_horizontally(struct drm_display_mode *mode,
171                     int width)
172 {
173         u32 border, sync_pos, blank_width, sync_width;
174
175         /* keep the hsync and hblank widths constant */
176         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
177         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
178         sync_pos = (blank_width - sync_width + 1) / 2;
179
180         border = (mode->hdisplay - width + 1) / 2;
181         border += border & 1; /* make the border even */
182
183         mode->crtc_hdisplay = width;
184         mode->crtc_hblank_start = width + border;
185         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
186
187         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
188         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
189 }
190
191 static void
192 centre_vertically(struct drm_display_mode *mode,
193                   int height)
194 {
195         u32 border, sync_pos, blank_width, sync_width;
196
197         /* keep the vsync and vblank widths constant */
198         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
199         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
200         sync_pos = (blank_width - sync_width + 1) / 2;
201
202         border = (mode->vdisplay - height + 1) / 2;
203
204         mode->crtc_vdisplay = height;
205         mode->crtc_vblank_start = height + border;
206         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
207
208         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
209         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
210 }
211
212 static inline u32 panel_fitter_scaling(u32 source, u32 target)
213 {
214         /*
215          * Floating point operation is not supported. So the FACTOR
216          * is defined, which can avoid the floating point computation
217          * when calculating the panel ratio.
218          */
219 #define ACCURACY 12
220 #define FACTOR (1 << ACCURACY)
221         u32 ratio = source * FACTOR / target;
222         return (FACTOR * ratio + FACTOR/2) / FACTOR;
223 }
224
225 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
226                                   struct drm_display_mode *mode,
227                                   struct drm_display_mode *adjusted_mode)
228 {
229         struct drm_device *dev = encoder->dev;
230         struct drm_i915_private *dev_priv = dev->dev_private;
231         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
232         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
233         struct drm_encoder *tmp_encoder;
234         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
235
236         /* Should never happen!! */
237         if (INTEL_INFO(dev)->gen < 4 && intel_crtc->pipe == 0) {
238                 DRM_ERROR("Can't support LVDS on pipe A\n");
239                 return false;
240         }
241
242         /* Should never happen!! */
243         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, head) {
244                 if (tmp_encoder != encoder && tmp_encoder->crtc == encoder->crtc) {
245                         DRM_ERROR("Can't enable LVDS and another "
246                                "encoder on the same pipe\n");
247                         return false;
248                 }
249         }
250
251         /*
252          * We have timings from the BIOS for the panel, put them in
253          * to the adjusted mode.  The CRTC will be set up for this mode,
254          * with the panel scaling set up to source from the H/VDisplay
255          * of the original mode.
256          */
257         intel_fixed_panel_mode(intel_lvds->fixed_mode, adjusted_mode);
258
259         if (HAS_PCH_SPLIT(dev)) {
260                 intel_pch_panel_fitting(dev, intel_lvds->fitting_mode,
261                                         mode, adjusted_mode);
262                 return true;
263         }
264
265         /* Make sure pre-965s set dither correctly */
266         if (INTEL_INFO(dev)->gen < 4) {
267                 if (dev_priv->lvds_dither)
268                         pfit_control |= PANEL_8TO6_DITHER_ENABLE;
269         }
270
271         /* Native modes don't need fitting */
272         if (adjusted_mode->hdisplay == mode->hdisplay &&
273             adjusted_mode->vdisplay == mode->vdisplay)
274                 goto out;
275
276         /* 965+ wants fuzzy fitting */
277         if (INTEL_INFO(dev)->gen >= 4)
278                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
279                                  PFIT_FILTER_FUZZY);
280
281         /*
282          * Enable automatic panel scaling for non-native modes so that they fill
283          * the screen.  Should be enabled before the pipe is enabled, according
284          * to register description and PRM.
285          * Change the value here to see the borders for debugging
286          */
287         I915_WRITE(BCLRPAT_A, 0);
288         I915_WRITE(BCLRPAT_B, 0);
289
290         switch (intel_lvds->fitting_mode) {
291         case DRM_MODE_SCALE_CENTER:
292                 /*
293                  * For centered modes, we have to calculate border widths &
294                  * heights and modify the values programmed into the CRTC.
295                  */
296                 centre_horizontally(adjusted_mode, mode->hdisplay);
297                 centre_vertically(adjusted_mode, mode->vdisplay);
298                 border = LVDS_BORDER_ENABLE;
299                 break;
300
301         case DRM_MODE_SCALE_ASPECT:
302                 /* Scale but preserve the aspect ratio */
303                 if (INTEL_INFO(dev)->gen >= 4) {
304                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
305                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
306
307                         pfit_control |= PFIT_ENABLE;
308                         /* 965+ is easy, it does everything in hw */
309                         if (scaled_width > scaled_height)
310                                 pfit_control |= PFIT_SCALING_PILLAR;
311                         else if (scaled_width < scaled_height)
312                                 pfit_control |= PFIT_SCALING_LETTER;
313                         else
314                                 pfit_control |= PFIT_SCALING_AUTO;
315                 } else {
316                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
317                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
318                         /*
319                          * For earlier chips we have to calculate the scaling
320                          * ratio by hand and program it into the
321                          * PFIT_PGM_RATIO register
322                          */
323                         if (scaled_width > scaled_height) { /* pillar */
324                                 centre_horizontally(adjusted_mode, scaled_height / mode->vdisplay);
325
326                                 border = LVDS_BORDER_ENABLE;
327                                 if (mode->vdisplay != adjusted_mode->vdisplay) {
328                                         u32 bits = panel_fitter_scaling(mode->vdisplay, adjusted_mode->vdisplay);
329                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
330                                                             bits << PFIT_VERT_SCALE_SHIFT);
331                                         pfit_control |= (PFIT_ENABLE |
332                                                          VERT_INTERP_BILINEAR |
333                                                          HORIZ_INTERP_BILINEAR);
334                                 }
335                         } else if (scaled_width < scaled_height) { /* letter */
336                                 centre_vertically(adjusted_mode, scaled_width / mode->hdisplay);
337
338                                 border = LVDS_BORDER_ENABLE;
339                                 if (mode->hdisplay != adjusted_mode->hdisplay) {
340                                         u32 bits = panel_fitter_scaling(mode->hdisplay, adjusted_mode->hdisplay);
341                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
342                                                             bits << PFIT_VERT_SCALE_SHIFT);
343                                         pfit_control |= (PFIT_ENABLE |
344                                                          VERT_INTERP_BILINEAR |
345                                                          HORIZ_INTERP_BILINEAR);
346                                 }
347                         } else
348                                 /* Aspects match, Let hw scale both directions */
349                                 pfit_control |= (PFIT_ENABLE |
350                                                  VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
351                                                  VERT_INTERP_BILINEAR |
352                                                  HORIZ_INTERP_BILINEAR);
353                 }
354                 break;
355
356         case DRM_MODE_SCALE_FULLSCREEN:
357                 /*
358                  * Full scaling, even if it changes the aspect ratio.
359                  * Fortunately this is all done for us in hw.
360                  */
361                 pfit_control |= PFIT_ENABLE;
362                 if (INTEL_INFO(dev)->gen >= 4)
363                         pfit_control |= PFIT_SCALING_AUTO;
364                 else
365                         pfit_control |= (VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
366                                          VERT_INTERP_BILINEAR |
367                                          HORIZ_INTERP_BILINEAR);
368                 break;
369
370         default:
371                 break;
372         }
373
374 out:
375         if (pfit_control != intel_lvds->pfit_control ||
376             pfit_pgm_ratios != intel_lvds->pfit_pgm_ratios) {
377                 intel_lvds->pfit_control = pfit_control;
378                 intel_lvds->pfit_pgm_ratios = pfit_pgm_ratios;
379                 intel_lvds->pfit_dirty = true;
380         }
381         dev_priv->lvds_border_bits = border;
382
383         /*
384          * XXX: It would be nice to support lower refresh rates on the
385          * panels to reduce power consumption, and perhaps match the
386          * user's requested refresh rate.
387          */
388
389         return true;
390 }
391
392 static void intel_lvds_prepare(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         dev_priv->backlight_level = intel_panel_get_backlight(dev);
399
400         /* We try to do the minimum that is necessary in order to unlock
401          * the registers for mode setting.
402          *
403          * On Ironlake, this is quite simple as we just set the unlock key
404          * and ignore all subtleties. (This may cause some issues...)
405          *
406          * Prior to Ironlake, we must disable the pipe if we want to adjust
407          * the panel fitter. However at all other times we can just reset
408          * the registers regardless.
409          */
410
411         if (HAS_PCH_SPLIT(dev)) {
412                 I915_WRITE(PCH_PP_CONTROL,
413                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
414         } else if (intel_lvds->pfit_dirty) {
415                 I915_WRITE(PP_CONTROL,
416                            (I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS)
417                            & ~POWER_TARGET_ON);
418         } else {
419                 I915_WRITE(PP_CONTROL,
420                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
421         }
422 }
423
424 static void intel_lvds_commit(struct drm_encoder *encoder)
425 {
426         struct drm_device *dev = encoder->dev;
427         struct drm_i915_private *dev_priv = dev->dev_private;
428         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
429
430         if (dev_priv->backlight_level == 0)
431                 dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
432
433         /* Undo any unlocking done in prepare to prevent accidental
434          * adjustment of the registers.
435          */
436         if (HAS_PCH_SPLIT(dev)) {
437                 u32 val = I915_READ(PCH_PP_CONTROL);
438                 if ((val & PANEL_UNLOCK_REGS) == PANEL_UNLOCK_REGS)
439                         I915_WRITE(PCH_PP_CONTROL, val & 0x3);
440         } else {
441                 u32 val = I915_READ(PP_CONTROL);
442                 if ((val & PANEL_UNLOCK_REGS) == PANEL_UNLOCK_REGS)
443                         I915_WRITE(PP_CONTROL, val & 0x3);
444         }
445
446         /* Always do a full power on as we do not know what state
447          * we were left in.
448          */
449         intel_lvds_enable(intel_lvds);
450 }
451
452 static void intel_lvds_mode_set(struct drm_encoder *encoder,
453                                 struct drm_display_mode *mode,
454                                 struct drm_display_mode *adjusted_mode)
455 {
456         /*
457          * The LVDS pin pair will already have been turned on in the
458          * intel_crtc_mode_set since it has a large impact on the DPLL
459          * settings.
460          */
461 }
462
463 /**
464  * Detect the LVDS connection.
465  *
466  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
467  * connected and closed means disconnected.  We also send hotplug events as
468  * needed, using lid status notification from the input layer.
469  */
470 static enum drm_connector_status
471 intel_lvds_detect(struct drm_connector *connector, bool force)
472 {
473         struct drm_device *dev = connector->dev;
474         enum drm_connector_status status = connector_status_connected;
475
476         /* ACPI lid methods were generally unreliable in this generation, so
477          * don't even bother.
478          */
479         if (IS_GEN2(dev) || IS_GEN3(dev))
480                 return connector_status_connected;
481
482         return status;
483 }
484
485 /**
486  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
487  */
488 static int intel_lvds_get_modes(struct drm_connector *connector)
489 {
490         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
491         struct drm_device *dev = connector->dev;
492         struct drm_display_mode *mode;
493
494         if (intel_lvds->edid)
495                 return drm_add_edid_modes(connector, intel_lvds->edid);
496
497         mode = drm_mode_duplicate(dev, intel_lvds->fixed_mode);
498         if (mode == 0)
499                 return 0;
500
501         drm_mode_probed_add(connector, mode);
502         return 1;
503 }
504
505 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
506 {
507         DRM_DEBUG_KMS("Skipping forced modeset for %s\n", id->ident);
508         return 1;
509 }
510
511 /* The GPU hangs up on these systems if modeset is performed on LID open */
512 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
513         {
514                 .callback = intel_no_modeset_on_lid_dmi_callback,
515                 .ident = "Toshiba Tecra A11",
516                 .matches = {
517                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
518                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
519                 },
520         },
521
522         { }     /* terminating entry */
523 };
524
525 /*
526  * Lid events. Note the use of 'modeset_on_lid':
527  *  - we set it on lid close, and reset it on open
528  *  - we use it as a "only once" bit (ie we ignore
529  *    duplicate events where it was already properly
530  *    set/reset)
531  *  - the suspend/resume paths will also set it to
532  *    zero, since they restore the mode ("lid open").
533  */
534 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
535                             void *unused)
536 {
537         struct drm_i915_private *dev_priv =
538                 container_of(nb, struct drm_i915_private, lid_notifier);
539         struct drm_device *dev = dev_priv->dev;
540         struct drm_connector *connector = dev_priv->int_lvds_connector;
541
542         /*
543          * check and update the status of LVDS connector after receiving
544          * the LID nofication event.
545          */
546         if (connector)
547                 connector->status = connector->funcs->detect(connector,
548                                                              false);
549
550         /* Don't force modeset on machines where it causes a GPU lockup */
551         if (dmi_check_system(intel_no_modeset_on_lid))
552                 return NOTIFY_OK;
553         if (!acpi_lid_open()) {
554                 dev_priv->modeset_on_lid = 1;
555                 return NOTIFY_OK;
556         }
557
558         if (!dev_priv->modeset_on_lid)
559                 return NOTIFY_OK;
560
561         dev_priv->modeset_on_lid = 0;
562
563         mutex_lock(&dev->mode_config.mutex);
564         drm_helper_resume_force_mode(dev);
565         mutex_unlock(&dev->mode_config.mutex);
566
567         return NOTIFY_OK;
568 }
569
570 /**
571  * intel_lvds_destroy - unregister and free LVDS structures
572  * @connector: connector to free
573  *
574  * Unregister the DDC bus for this connector then free the driver private
575  * structure.
576  */
577 static void intel_lvds_destroy(struct drm_connector *connector)
578 {
579         struct drm_device *dev = connector->dev;
580         struct drm_i915_private *dev_priv = dev->dev_private;
581
582         if (dev_priv->lid_notifier.notifier_call)
583                 acpi_lid_notifier_unregister(&dev_priv->lid_notifier);
584         drm_sysfs_connector_remove(connector);
585         drm_connector_cleanup(connector);
586         kfree(connector);
587 }
588
589 static int intel_lvds_set_property(struct drm_connector *connector,
590                                    struct drm_property *property,
591                                    uint64_t value)
592 {
593         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
594         struct drm_device *dev = connector->dev;
595
596         if (property == dev->mode_config.scaling_mode_property) {
597                 struct drm_crtc *crtc = intel_lvds->base.base.crtc;
598
599                 if (value == DRM_MODE_SCALE_NONE) {
600                         DRM_DEBUG_KMS("no scaling not supported\n");
601                         return -EINVAL;
602                 }
603
604                 if (intel_lvds->fitting_mode == value) {
605                         /* the LVDS scaling property is not changed */
606                         return 0;
607                 }
608                 intel_lvds->fitting_mode = value;
609                 if (crtc && crtc->enabled) {
610                         /*
611                          * If the CRTC is enabled, the display will be changed
612                          * according to the new panel fitting mode.
613                          */
614                         drm_crtc_helper_set_mode(crtc, &crtc->mode,
615                                 crtc->x, crtc->y, crtc->fb);
616                 }
617         }
618
619         return 0;
620 }
621
622 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
623         .dpms = intel_lvds_dpms,
624         .mode_fixup = intel_lvds_mode_fixup,
625         .prepare = intel_lvds_prepare,
626         .mode_set = intel_lvds_mode_set,
627         .commit = intel_lvds_commit,
628 };
629
630 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
631         .get_modes = intel_lvds_get_modes,
632         .mode_valid = intel_lvds_mode_valid,
633         .best_encoder = intel_best_encoder,
634 };
635
636 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
637         .dpms = drm_helper_connector_dpms,
638         .detect = intel_lvds_detect,
639         .fill_modes = drm_helper_probe_single_connector_modes,
640         .set_property = intel_lvds_set_property,
641         .destroy = intel_lvds_destroy,
642 };
643
644 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
645         .destroy = intel_encoder_destroy,
646 };
647
648 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
649 {
650         DRM_DEBUG_KMS("Skipping LVDS initialization for %s\n", id->ident);
651         return 1;
652 }
653
654 /* These systems claim to have LVDS, but really don't */
655 static const struct dmi_system_id intel_no_lvds[] = {
656         {
657                 .callback = intel_no_lvds_dmi_callback,
658                 .ident = "Apple Mac Mini (Core series)",
659                 .matches = {
660                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
661                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
662                 },
663         },
664         {
665                 .callback = intel_no_lvds_dmi_callback,
666                 .ident = "Apple Mac Mini (Core 2 series)",
667                 .matches = {
668                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
669                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
670                 },
671         },
672         {
673                 .callback = intel_no_lvds_dmi_callback,
674                 .ident = "MSI IM-945GSE-A",
675                 .matches = {
676                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
677                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
678                 },
679         },
680         {
681                 .callback = intel_no_lvds_dmi_callback,
682                 .ident = "Dell Studio Hybrid",
683                 .matches = {
684                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
685                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
686                 },
687         },
688         {
689                 .callback = intel_no_lvds_dmi_callback,
690                 .ident = "AOpen Mini PC",
691                 .matches = {
692                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
693                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
694                 },
695         },
696         {
697                 .callback = intel_no_lvds_dmi_callback,
698                 .ident = "AOpen Mini PC MP915",
699                 .matches = {
700                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
701                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
702                 },
703         },
704         {
705                 .callback = intel_no_lvds_dmi_callback,
706                 .ident = "Aopen i945GTt-VFA",
707                 .matches = {
708                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
709                 },
710         },
711         {
712                 .callback = intel_no_lvds_dmi_callback,
713                 .ident = "Clientron U800",
714                 .matches = {
715                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
716                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
717                 },
718         },
719
720         { }     /* terminating entry */
721 };
722
723 /**
724  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
725  * @dev: drm device
726  * @connector: LVDS connector
727  *
728  * Find the reduced downclock for LVDS in EDID.
729  */
730 static void intel_find_lvds_downclock(struct drm_device *dev,
731                                       struct drm_display_mode *fixed_mode,
732                                       struct drm_connector *connector)
733 {
734         struct drm_i915_private *dev_priv = dev->dev_private;
735         struct drm_display_mode *scan;
736         int temp_downclock;
737
738         temp_downclock = fixed_mode->clock;
739         list_for_each_entry(scan, &connector->probed_modes, head) {
740                 /*
741                  * If one mode has the same resolution with the fixed_panel
742                  * mode while they have the different refresh rate, it means
743                  * that the reduced downclock is found for the LVDS. In such
744                  * case we can set the different FPx0/1 to dynamically select
745                  * between low and high frequency.
746                  */
747                 if (scan->hdisplay == fixed_mode->hdisplay &&
748                     scan->hsync_start == fixed_mode->hsync_start &&
749                     scan->hsync_end == fixed_mode->hsync_end &&
750                     scan->htotal == fixed_mode->htotal &&
751                     scan->vdisplay == fixed_mode->vdisplay &&
752                     scan->vsync_start == fixed_mode->vsync_start &&
753                     scan->vsync_end == fixed_mode->vsync_end &&
754                     scan->vtotal == fixed_mode->vtotal) {
755                         if (scan->clock < temp_downclock) {
756                                 /*
757                                  * The downclock is already found. But we
758                                  * expect to find the lower downclock.
759                                  */
760                                 temp_downclock = scan->clock;
761                         }
762                 }
763         }
764         if (temp_downclock < fixed_mode->clock && i915_lvds_downclock) {
765                 /* We found the downclock for LVDS. */
766                 dev_priv->lvds_downclock_avail = 1;
767                 dev_priv->lvds_downclock = temp_downclock;
768                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
769                               "Normal clock %dKhz, downclock %dKhz\n",
770                               fixed_mode->clock, temp_downclock);
771         }
772 }
773
774 /*
775  * Enumerate the child dev array parsed from VBT to check whether
776  * the LVDS is present.
777  * If it is present, return 1.
778  * If it is not present, return false.
779  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
780  */
781 static bool lvds_is_present_in_vbt(struct drm_device *dev,
782                                    u8 *i2c_pin)
783 {
784         struct drm_i915_private *dev_priv = dev->dev_private;
785         int i;
786
787         if (!dev_priv->child_dev_num)
788                 return true;
789
790         for (i = 0; i < dev_priv->child_dev_num; i++) {
791                 struct child_device_config *child = dev_priv->child_dev + i;
792
793                 /* If the device type is not LFP, continue.
794                  * We have to check both the new identifiers as well as the
795                  * old for compatibility with some BIOSes.
796                  */
797                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
798                     child->device_type != DEVICE_TYPE_LFP)
799                         continue;
800
801                 if (child->i2c_pin)
802                     *i2c_pin = child->i2c_pin;
803
804                 /* However, we cannot trust the BIOS writers to populate
805                  * the VBT correctly.  Since LVDS requires additional
806                  * information from AIM blocks, a non-zero addin offset is
807                  * a good indicator that the LVDS is actually present.
808                  */
809                 if (child->addin_offset)
810                         return true;
811
812                 /* But even then some BIOS writers perform some black magic
813                  * and instantiate the device without reference to any
814                  * additional data.  Trust that if the VBT was written into
815                  * the OpRegion then they have validated the LVDS's existence.
816                  */
817                 if (dev_priv->opregion.vbt)
818                         return true;
819         }
820
821         return false;
822 }
823
824 static bool intel_lvds_ddc_probe(struct drm_device *dev, u8 pin)
825 {
826         struct drm_i915_private *dev_priv = dev->dev_private;
827         u8 buf = 0;
828         struct i2c_msg msgs[] = {
829                 {
830                         .addr = 0xA0,
831                         .flags = 0,
832                         .len = 1,
833                         .buf = &buf,
834                 },
835         };
836         struct i2c_adapter *i2c = &dev_priv->gmbus[pin].adapter;
837         /* XXX this only appears to work when using GMBUS */
838         if (intel_gmbus_is_forced_bit(i2c))
839                 return true;
840         return i2c_transfer(i2c, msgs, 1) == 1;
841 }
842
843 /**
844  * intel_lvds_init - setup LVDS connectors on this device
845  * @dev: drm device
846  *
847  * Create the connector, register the LVDS DDC bus, and try to figure out what
848  * modes we can display on the LVDS panel (if present).
849  */
850 bool intel_lvds_init(struct drm_device *dev)
851 {
852         struct drm_i915_private *dev_priv = dev->dev_private;
853         struct intel_lvds *intel_lvds;
854         struct intel_encoder *intel_encoder;
855         struct intel_connector *intel_connector;
856         struct drm_connector *connector;
857         struct drm_encoder *encoder;
858         struct drm_display_mode *scan; /* *modes, *bios_mode; */
859         struct drm_crtc *crtc;
860         u32 lvds;
861         int pipe;
862         u8 pin;
863
864         /* Skip init on machines we know falsely report LVDS */
865         if (dmi_check_system(intel_no_lvds))
866                 return false;
867
868         pin = GMBUS_PORT_PANEL;
869         if (!lvds_is_present_in_vbt(dev, &pin)) {
870                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
871                 return false;
872         }
873
874         if (HAS_PCH_SPLIT(dev)) {
875                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
876                         return false;
877                 if (dev_priv->edp.support) {
878                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
879                         return false;
880                 }
881         }
882
883         if (!intel_lvds_ddc_probe(dev, pin)) {
884                 DRM_DEBUG_KMS("LVDS did not respond to DDC probe\n");
885                 return false;
886         }
887
888         intel_lvds = kzalloc(sizeof(struct intel_lvds), GFP_KERNEL);
889         if (!intel_lvds) {
890                 return false;
891         }
892
893         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
894         if (!intel_connector) {
895                 kfree(intel_lvds);
896                 return false;
897         }
898
899         if (!HAS_PCH_SPLIT(dev)) {
900                 intel_lvds->pfit_control = I915_READ(PFIT_CONTROL);
901         }
902
903         intel_encoder = &intel_lvds->base;
904         encoder = &intel_encoder->base;
905         connector = &intel_connector->base;
906         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
907                            DRM_MODE_CONNECTOR_LVDS);
908
909         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
910                          DRM_MODE_ENCODER_LVDS);
911
912         intel_connector_attach_encoder(intel_connector, intel_encoder);
913         intel_encoder->type = INTEL_OUTPUT_LVDS;
914
915         intel_encoder->clone_mask = (1 << INTEL_LVDS_CLONE_BIT);
916         intel_encoder->crtc_mask = (1 << 1);
917         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
918         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
919         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
920         connector->interlace_allowed = false;
921         connector->doublescan_allowed = false;
922
923         /* create the scaling mode property */
924         drm_mode_create_scaling_mode_property(dev);
925         /*
926          * the initial panel fitting mode will be FULL_SCREEN.
927          */
928
929         drm_connector_attach_property(&intel_connector->base,
930                                       dev->mode_config.scaling_mode_property,
931                                       DRM_MODE_SCALE_ASPECT);
932         intel_lvds->fitting_mode = DRM_MODE_SCALE_ASPECT;
933         /*
934          * LVDS discovery:
935          * 1) check for EDID on DDC
936          * 2) check for VBT data
937          * 3) check to see if LVDS is already on
938          *    if none of the above, no panel
939          * 4) make sure lid is open
940          *    if closed, act like it's not there for now
941          */
942
943         /*
944          * Attempt to get the fixed panel mode from DDC.  Assume that the
945          * preferred mode is the right one.
946          */
947         intel_lvds->edid = drm_get_edid(connector,
948                                         &dev_priv->gmbus[pin].adapter);
949         if (intel_lvds->edid) {
950                 if (drm_add_edid_modes(connector,
951                                        intel_lvds->edid)) {
952                         drm_mode_connector_update_edid_property(connector,
953                                                                 intel_lvds->edid);
954                 } else {
955                         kfree(intel_lvds->edid);
956                         intel_lvds->edid = NULL;
957                 }
958         }
959         if (!intel_lvds->edid) {
960                 /* Didn't get an EDID, so
961                  * Set wide sync ranges so we get all modes
962                  * handed to valid_mode for checking
963                  */
964                 connector->display_info.min_vfreq = 0;
965                 connector->display_info.max_vfreq = 200;
966                 connector->display_info.min_hfreq = 0;
967                 connector->display_info.max_hfreq = 200;
968         }
969
970         list_for_each_entry(scan, &connector->probed_modes, head) {
971                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
972                         intel_lvds->fixed_mode =
973                                 drm_mode_duplicate(dev, scan);
974                         intel_find_lvds_downclock(dev,
975                                                   intel_lvds->fixed_mode,
976                                                   connector);
977                         goto out;
978                 }
979         }
980
981         /* Failed to get EDID, what about VBT? */
982         if (dev_priv->lfp_lvds_vbt_mode) {
983                 intel_lvds->fixed_mode =
984                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
985                 if (intel_lvds->fixed_mode) {
986                         intel_lvds->fixed_mode->type |=
987                                 DRM_MODE_TYPE_PREFERRED;
988                         goto out;
989                 }
990         }
991
992         /*
993          * If we didn't get EDID, try checking if the panel is already turned
994          * on.  If so, assume that whatever is currently programmed is the
995          * correct mode.
996          */
997
998         /* Ironlake: FIXME if still fail, not try pipe mode now */
999         if (HAS_PCH_SPLIT(dev))
1000                 goto failed;
1001
1002         lvds = I915_READ(LVDS);
1003         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1004         crtc = intel_get_crtc_for_pipe(dev, pipe);
1005
1006         if (crtc && (lvds & LVDS_PORT_EN)) {
1007                 intel_lvds->fixed_mode = intel_crtc_mode_get(dev, crtc);
1008                 if (intel_lvds->fixed_mode) {
1009                         intel_lvds->fixed_mode->type |=
1010                                 DRM_MODE_TYPE_PREFERRED;
1011                         goto out;
1012                 }
1013         }
1014
1015         /* If we still don't have a mode after all that, give up. */
1016         if (!intel_lvds->fixed_mode)
1017                 goto failed;
1018
1019 out:
1020         if (HAS_PCH_SPLIT(dev)) {
1021                 u32 pwm;
1022                 /* make sure PWM is enabled */
1023                 pwm = I915_READ(BLC_PWM_CPU_CTL2);
1024                 pwm |= (PWM_ENABLE | PWM_PIPE_B);
1025                 I915_WRITE(BLC_PWM_CPU_CTL2, pwm);
1026
1027                 pwm = I915_READ(BLC_PWM_PCH_CTL1);
1028                 pwm |= PWM_PCH_ENABLE;
1029                 I915_WRITE(BLC_PWM_PCH_CTL1, pwm);
1030         }
1031         dev_priv->lid_notifier.notifier_call = intel_lid_notify;
1032         if (acpi_lid_notifier_register(&dev_priv->lid_notifier)) {
1033                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1034                 dev_priv->lid_notifier.notifier_call = NULL;
1035         }
1036         /* keep the LVDS connector */
1037         dev_priv->int_lvds_connector = connector;
1038         drm_sysfs_connector_add(connector);
1039         return true;
1040
1041 failed:
1042         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1043         drm_connector_cleanup(connector);
1044         drm_encoder_cleanup(encoder);
1045         kfree(intel_lvds);
1046         kfree(intel_connector);
1047         return false;
1048 }