- Linux 3.0.50.
[opensuse:kernel.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, stat_reg;
76
77         if (HAS_PCH_SPLIT(dev)) {
78                 ctl_reg = PCH_PP_CONTROL;
79                 lvds_reg = PCH_LVDS;
80                 stat_reg = PCH_PP_STATUS;
81         } else {
82                 ctl_reg = PP_CONTROL;
83                 lvds_reg = LVDS;
84                 stat_reg = PP_STATUS;
85         }
86
87         I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
88
89         if (intel_lvds->pfit_dirty) {
90                 /*
91                  * Enable automatic panel scaling so that non-native modes
92                  * fill the screen.  The panel fitter should only be
93                  * adjusted whilst the pipe is disabled, according to
94                  * register description and PRM.
95                  */
96                 DRM_DEBUG_KMS("applying panel-fitter: %x, %x\n",
97                               intel_lvds->pfit_control,
98                               intel_lvds->pfit_pgm_ratios);
99
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         I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
106         POSTING_READ(lvds_reg);
107         if (wait_for((I915_READ(stat_reg) & PP_ON) != 0, 1000))
108                 DRM_ERROR("timed out waiting for panel to power on\n");
109
110         intel_panel_enable_backlight(dev);
111 }
112
113 static void intel_lvds_disable(struct intel_lvds *intel_lvds)
114 {
115         struct drm_device *dev = intel_lvds->base.base.dev;
116         struct drm_i915_private *dev_priv = dev->dev_private;
117         u32 ctl_reg, lvds_reg, stat_reg;
118
119         if (HAS_PCH_SPLIT(dev)) {
120                 ctl_reg = PCH_PP_CONTROL;
121                 lvds_reg = PCH_LVDS;
122                 stat_reg = PCH_PP_STATUS;
123         } else {
124                 ctl_reg = PP_CONTROL;
125                 lvds_reg = LVDS;
126                 stat_reg = PP_STATUS;
127         }
128
129         intel_panel_disable_backlight(dev);
130
131         I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
132         if (wait_for((I915_READ(stat_reg) & PP_ON) == 0, 1000))
133                 DRM_ERROR("timed out waiting for panel to power off\n");
134
135         if (intel_lvds->pfit_control) {
136                 I915_WRITE(PFIT_CONTROL, 0);
137                 intel_lvds->pfit_dirty = true;
138         }
139
140         I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
141         POSTING_READ(lvds_reg);
142 }
143
144 static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)
145 {
146         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
147
148         if (mode == DRM_MODE_DPMS_ON)
149                 intel_lvds_enable(intel_lvds);
150         else
151                 intel_lvds_disable(intel_lvds);
152
153         /* XXX: We never power down the LVDS pairs. */
154 }
155
156 static int intel_lvds_mode_valid(struct drm_connector *connector,
157                                  struct drm_display_mode *mode)
158 {
159         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
160         struct drm_display_mode *fixed_mode = intel_lvds->fixed_mode;
161
162         if (mode->hdisplay > fixed_mode->hdisplay)
163                 return MODE_PANEL;
164         if (mode->vdisplay > fixed_mode->vdisplay)
165                 return MODE_PANEL;
166
167         return MODE_OK;
168 }
169
170 static void
171 centre_horizontally(struct drm_display_mode *mode,
172                     int width)
173 {
174         u32 border, sync_pos, blank_width, sync_width;
175
176         /* keep the hsync and hblank widths constant */
177         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
178         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
179         sync_pos = (blank_width - sync_width + 1) / 2;
180
181         border = (mode->hdisplay - width + 1) / 2;
182         border += border & 1; /* make the border even */
183
184         mode->crtc_hdisplay = width;
185         mode->crtc_hblank_start = width + border;
186         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
187
188         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
189         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
190 }
191
192 static void
193 centre_vertically(struct drm_display_mode *mode,
194                   int height)
195 {
196         u32 border, sync_pos, blank_width, sync_width;
197
198         /* keep the vsync and vblank widths constant */
199         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
200         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
201         sync_pos = (blank_width - sync_width + 1) / 2;
202
203         border = (mode->vdisplay - height + 1) / 2;
204
205         mode->crtc_vdisplay = height;
206         mode->crtc_vblank_start = height + border;
207         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
208
209         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
210         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
211 }
212
213 static inline u32 panel_fitter_scaling(u32 source, u32 target)
214 {
215         /*
216          * Floating point operation is not supported. So the FACTOR
217          * is defined, which can avoid the floating point computation
218          * when calculating the panel ratio.
219          */
220 #define ACCURACY 12
221 #define FACTOR (1 << ACCURACY)
222         u32 ratio = source * FACTOR / target;
223         return (FACTOR * ratio + FACTOR/2) / FACTOR;
224 }
225
226 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
227                                   struct drm_display_mode *mode,
228                                   struct drm_display_mode *adjusted_mode)
229 {
230         struct drm_device *dev = encoder->dev;
231         struct drm_i915_private *dev_priv = dev->dev_private;
232         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
233         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
234         struct drm_encoder *tmp_encoder;
235         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
236         int pipe;
237
238         /* Should never happen!! */
239         if (INTEL_INFO(dev)->gen < 4 && intel_crtc->pipe == 0) {
240                 DRM_ERROR("Can't support LVDS on pipe A\n");
241                 return false;
242         }
243
244         /* Should never happen!! */
245         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, head) {
246                 if (tmp_encoder != encoder && tmp_encoder->crtc == encoder->crtc) {
247                         DRM_ERROR("Can't enable LVDS and another "
248                                "encoder on the same pipe\n");
249                         return false;
250                 }
251         }
252
253         /*
254          * We have timings from the BIOS for the panel, put them in
255          * to the adjusted mode.  The CRTC will be set up for this mode,
256          * with the panel scaling set up to source from the H/VDisplay
257          * of the original mode.
258          */
259         intel_fixed_panel_mode(intel_lvds->fixed_mode, adjusted_mode);
260
261         if (HAS_PCH_SPLIT(dev)) {
262                 intel_pch_panel_fitting(dev, intel_lvds->fitting_mode,
263                                         mode, adjusted_mode);
264                 return true;
265         }
266
267         /* Native modes don't need fitting */
268         if (adjusted_mode->hdisplay == mode->hdisplay &&
269             adjusted_mode->vdisplay == mode->vdisplay)
270                 goto out;
271
272         /* 965+ wants fuzzy fitting */
273         if (INTEL_INFO(dev)->gen >= 4)
274                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
275                                  PFIT_FILTER_FUZZY);
276
277         /*
278          * Enable automatic panel scaling for non-native modes so that they fill
279          * the screen.  Should be enabled before the pipe is enabled, according
280          * to register description and PRM.
281          * Change the value here to see the borders for debugging
282          */
283         for_each_pipe(pipe)
284                 I915_WRITE(BCLRPAT(pipe), 0);
285
286         switch (intel_lvds->fitting_mode) {
287         case DRM_MODE_SCALE_CENTER:
288                 /*
289                  * For centered modes, we have to calculate border widths &
290                  * heights and modify the values programmed into the CRTC.
291                  */
292                 centre_horizontally(adjusted_mode, mode->hdisplay);
293                 centre_vertically(adjusted_mode, mode->vdisplay);
294                 border = LVDS_BORDER_ENABLE;
295                 break;
296
297         case DRM_MODE_SCALE_ASPECT:
298                 /* Scale but preserve the aspect ratio */
299                 if (INTEL_INFO(dev)->gen >= 4) {
300                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
301                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
302
303                         /* 965+ is easy, it does everything in hw */
304                         if (scaled_width > scaled_height)
305                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_PILLAR;
306                         else if (scaled_width < scaled_height)
307                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_LETTER;
308                         else if (adjusted_mode->hdisplay != mode->hdisplay)
309                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
310                 } else {
311                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
312                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
313                         /*
314                          * For earlier chips we have to calculate the scaling
315                          * ratio by hand and program it into the
316                          * PFIT_PGM_RATIO register
317                          */
318                         if (scaled_width > scaled_height) { /* pillar */
319                                 centre_horizontally(adjusted_mode, scaled_height / mode->vdisplay);
320
321                                 border = LVDS_BORDER_ENABLE;
322                                 if (mode->vdisplay != adjusted_mode->vdisplay) {
323                                         u32 bits = panel_fitter_scaling(mode->vdisplay, adjusted_mode->vdisplay);
324                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
325                                                             bits << PFIT_VERT_SCALE_SHIFT);
326                                         pfit_control |= (PFIT_ENABLE |
327                                                          VERT_INTERP_BILINEAR |
328                                                          HORIZ_INTERP_BILINEAR);
329                                 }
330                         } else if (scaled_width < scaled_height) { /* letter */
331                                 centre_vertically(adjusted_mode, scaled_width / mode->hdisplay);
332
333                                 border = LVDS_BORDER_ENABLE;
334                                 if (mode->hdisplay != adjusted_mode->hdisplay) {
335                                         u32 bits = panel_fitter_scaling(mode->hdisplay, adjusted_mode->hdisplay);
336                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
337                                                             bits << PFIT_VERT_SCALE_SHIFT);
338                                         pfit_control |= (PFIT_ENABLE |
339                                                          VERT_INTERP_BILINEAR |
340                                                          HORIZ_INTERP_BILINEAR);
341                                 }
342                         } else
343                                 /* Aspects match, Let hw scale both directions */
344                                 pfit_control |= (PFIT_ENABLE |
345                                                  VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
346                                                  VERT_INTERP_BILINEAR |
347                                                  HORIZ_INTERP_BILINEAR);
348                 }
349                 break;
350
351         case DRM_MODE_SCALE_FULLSCREEN:
352                 /*
353                  * Full scaling, even if it changes the aspect ratio.
354                  * Fortunately this is all done for us in hw.
355                  */
356                 if (mode->vdisplay != adjusted_mode->vdisplay ||
357                     mode->hdisplay != adjusted_mode->hdisplay) {
358                         pfit_control |= PFIT_ENABLE;
359                         if (INTEL_INFO(dev)->gen >= 4)
360                                 pfit_control |= PFIT_SCALING_AUTO;
361                         else
362                                 pfit_control |= (VERT_AUTO_SCALE |
363                                                  VERT_INTERP_BILINEAR |
364                                                  HORIZ_AUTO_SCALE |
365                                                  HORIZ_INTERP_BILINEAR);
366                 }
367                 break;
368
369         default:
370                 break;
371         }
372
373 out:
374         /* If not enabling scaling, be consistent and always use 0. */
375         if ((pfit_control & PFIT_ENABLE) == 0) {
376                 pfit_control = 0;
377                 pfit_pgm_ratios = 0;
378         }
379
380         /* Make sure pre-965 set dither correctly */
381         if (INTEL_INFO(dev)->gen < 4 && dev_priv->lvds_dither)
382                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
383
384         if (pfit_control != intel_lvds->pfit_control ||
385             pfit_pgm_ratios != intel_lvds->pfit_pgm_ratios) {
386                 intel_lvds->pfit_control = pfit_control;
387                 intel_lvds->pfit_pgm_ratios = pfit_pgm_ratios;
388                 intel_lvds->pfit_dirty = true;
389         }
390         dev_priv->lvds_border_bits = border;
391
392         /*
393          * XXX: It would be nice to support lower refresh rates on the
394          * panels to reduce power consumption, and perhaps match the
395          * user's requested refresh rate.
396          */
397
398         return true;
399 }
400
401 static int intel_disable_at_modeset_callback(const struct dmi_system_id *id)
402 {
403         DRM_DEBUG_KMS("Disabling LVDS at modeset for %s\n", id->ident);
404         return 1;
405 }
406
407 /* Requires to disable LVDS for avoiding a broken screen at mode change */
408 static const struct dmi_system_id intel_disable_at_modeset[] = {
409         {
410                 .callback = intel_disable_at_modeset_callback,
411                 .ident = "HP ProBook",
412                 .matches = {
413                         DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
414                         DMI_MATCH(DMI_PRODUCT_NAME, "HP ProBook"),
415                 },
416         },
417         {
418                 .callback = intel_disable_at_modeset_callback,
419                 .ident = "HP ProBook",
420                 .matches = {
421                         DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
422                         DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook"),
423                 },
424         },
425
426         { }     /* terminating entry */
427 };
428
429 static void intel_lvds_prepare(struct drm_encoder *encoder)
430 {
431         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
432
433         /*
434          * Prior to Ironlake, we must disable the pipe if we want to adjust
435          * the panel fitter. However at all other times we can just reset
436          * the registers regardless.
437          */
438         if ((!HAS_PCH_SPLIT(encoder->dev) && intel_lvds->pfit_dirty) ||
439             dmi_check_system(intel_disable_at_modeset))
440                 intel_lvds_disable(intel_lvds);
441 }
442
443 static void intel_lvds_commit(struct drm_encoder *encoder)
444 {
445         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
446
447         /* Always do a full power on as we do not know what state
448          * we were left in.
449          */
450         intel_lvds_enable(intel_lvds);
451 }
452
453 static void intel_lvds_mode_set(struct drm_encoder *encoder,
454                                 struct drm_display_mode *mode,
455                                 struct drm_display_mode *adjusted_mode)
456 {
457         /*
458          * The LVDS pin pair will already have been turned on in the
459          * intel_crtc_mode_set since it has a large impact on the DPLL
460          * settings.
461          */
462 }
463
464 /**
465  * Detect the LVDS connection.
466  *
467  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
468  * connected and closed means disconnected.  We also send hotplug events as
469  * needed, using lid status notification from the input layer.
470  */
471 static enum drm_connector_status
472 intel_lvds_detect(struct drm_connector *connector, bool force)
473 {
474         struct drm_device *dev = connector->dev;
475         enum drm_connector_status status;
476
477         status = intel_panel_detect(dev);
478         if (status != connector_status_unknown)
479                 return status;
480
481         return connector_status_connected;
482 }
483
484 static struct panel_size {
485         int width, height;
486 } std_panel_sizes[] = {
487         {1600, 1200}, {1920, 1080}, {1680, 1050}, {1280, 1024},
488         {1600, 900}, {1440, 900}, {1280, 800},
489         {1366, 768}, {1360, 768}, {1280, 768},
490         {1024, 768}, {1280, 720}, {800, 600},
491         {0, 0}
492 };
493
494 static int add_standard_modes(struct drm_connector *connector,
495                               struct drm_display_mode *fixed)
496 {
497         struct drm_device *dev = connector->dev;
498         struct panel_size *p = std_panel_sizes;
499         int nums = 0;
500
501         for (; p->width; p++) {
502                 struct drm_display_mode *m;
503                 if (p->width > fixed->hdisplay || p->height > fixed->vdisplay)
504                         continue;
505                 list_for_each_entry(m, &connector->probed_modes, head) {
506                         if (p->width == m->hdisplay && p->height == m->vdisplay)
507                                 goto next;
508                 }
509                 m = drm_mode_duplicate(dev, fixed);
510                 if (m) {
511                         m->hdisplay = p->width;
512                         m->vdisplay = p->height;
513                         m->type &= ~DRM_MODE_TYPE_PREFERRED;
514                         drm_mode_set_name(m);
515                         drm_mode_probed_add(connector, m);
516                         nums++;
517                 }
518         next: ;
519         }
520         return nums;
521 }
522
523 /**
524  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
525  */
526 static int intel_lvds_get_modes(struct drm_connector *connector)
527 {
528         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
529         struct drm_device *dev = connector->dev;
530         struct drm_display_mode *mode;
531         int ret = 0;
532
533         if (intel_lvds->edid)
534                 ret = drm_add_edid_modes(connector, intel_lvds->edid);
535         if (!ret) {
536                 mode = drm_mode_duplicate(dev, intel_lvds->fixed_mode);
537                 if (!mode)
538                         return 0;
539                 drm_mode_probed_add(connector, mode);
540                 ret = 1;
541         }
542         ret += add_standard_modes(connector, intel_lvds->fixed_mode);
543         return ret;
544 }
545
546 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
547 {
548         DRM_DEBUG_KMS("Skipping forced modeset for %s\n", id->ident);
549         return 1;
550 }
551
552 /* The GPU hangs up on these systems if modeset is performed on LID open */
553 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
554         {
555                 .callback = intel_no_modeset_on_lid_dmi_callback,
556                 .ident = "Toshiba Tecra A11",
557                 .matches = {
558                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
559                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
560                 },
561         },
562
563         { }     /* terminating entry */
564 };
565
566 /*
567  * Lid events. Note the use of 'modeset_on_lid':
568  *  - we set it on lid close, and reset it on open
569  *  - we use it as a "only once" bit (ie we ignore
570  *    duplicate events where it was already properly
571  *    set/reset)
572  *  - the suspend/resume paths will also set it to
573  *    zero, since they restore the mode ("lid open").
574  */
575 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
576                             void *unused)
577 {
578         struct drm_i915_private *dev_priv =
579                 container_of(nb, struct drm_i915_private, lid_notifier);
580         struct drm_device *dev = dev_priv->dev;
581         struct drm_connector *connector = dev_priv->int_lvds_connector;
582
583         if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
584                 return NOTIFY_OK;
585
586         /*
587          * check and update the status of LVDS connector after receiving
588          * the LID nofication event.
589          */
590         if (connector)
591                 connector->status = connector->funcs->detect(connector,
592                                                              false);
593
594         /* Don't force modeset on machines where it causes a GPU lockup */
595         if (dmi_check_system(intel_no_modeset_on_lid))
596                 return NOTIFY_OK;
597         if (!acpi_lid_open()) {
598                 dev_priv->modeset_on_lid = 1;
599                 return NOTIFY_OK;
600         }
601
602         if (!dev_priv->modeset_on_lid)
603                 return NOTIFY_OK;
604
605         dev_priv->modeset_on_lid = 0;
606
607         mutex_lock(&dev->mode_config.mutex);
608         drm_helper_resume_force_mode(dev);
609         mutex_unlock(&dev->mode_config.mutex);
610
611         return NOTIFY_OK;
612 }
613
614 /**
615  * intel_lvds_destroy - unregister and free LVDS structures
616  * @connector: connector to free
617  *
618  * Unregister the DDC bus for this connector then free the driver private
619  * structure.
620  */
621 static void intel_lvds_destroy(struct drm_connector *connector)
622 {
623         struct drm_device *dev = connector->dev;
624         struct drm_i915_private *dev_priv = dev->dev_private;
625
626         intel_panel_destroy_backlight(dev);
627
628         if (dev_priv->lid_notifier.notifier_call)
629                 acpi_lid_notifier_unregister(&dev_priv->lid_notifier);
630         drm_sysfs_connector_remove(connector);
631         drm_connector_cleanup(connector);
632         kfree(connector);
633 }
634
635 static int intel_lvds_set_property(struct drm_connector *connector,
636                                    struct drm_property *property,
637                                    uint64_t value)
638 {
639         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
640         struct drm_device *dev = connector->dev;
641
642         if (property == dev->mode_config.scaling_mode_property) {
643                 struct drm_crtc *crtc = intel_lvds->base.base.crtc;
644
645                 if (value == DRM_MODE_SCALE_NONE) {
646                         DRM_DEBUG_KMS("no scaling not supported\n");
647                         return -EINVAL;
648                 }
649
650                 if (intel_lvds->fitting_mode == value) {
651                         /* the LVDS scaling property is not changed */
652                         return 0;
653                 }
654                 intel_lvds->fitting_mode = value;
655                 if (crtc && crtc->enabled) {
656                         /*
657                          * If the CRTC is enabled, the display will be changed
658                          * according to the new panel fitting mode.
659                          */
660                         drm_crtc_helper_set_mode(crtc, &crtc->mode,
661                                 crtc->x, crtc->y, crtc->fb);
662                 }
663         }
664
665         return 0;
666 }
667
668 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
669         .dpms = intel_lvds_dpms,
670         .mode_fixup = intel_lvds_mode_fixup,
671         .prepare = intel_lvds_prepare,
672         .mode_set = intel_lvds_mode_set,
673         .commit = intel_lvds_commit,
674 };
675
676 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
677         .get_modes = intel_lvds_get_modes,
678         .mode_valid = intel_lvds_mode_valid,
679         .best_encoder = intel_best_encoder,
680 };
681
682 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
683         .dpms = drm_helper_connector_dpms,
684         .detect = intel_lvds_detect,
685         .fill_modes = drm_helper_probe_single_connector_modes,
686         .set_property = intel_lvds_set_property,
687         .destroy = intel_lvds_destroy,
688 };
689
690 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
691         .destroy = intel_encoder_destroy,
692 };
693
694 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
695 {
696         DRM_DEBUG_KMS("Skipping LVDS initialization for %s\n", id->ident);
697         return 1;
698 }
699
700 /* These systems claim to have LVDS, but really don't */
701 static const struct dmi_system_id intel_no_lvds[] = {
702         {
703                 .callback = intel_no_lvds_dmi_callback,
704                 .ident = "Apple Mac Mini (Core series)",
705                 .matches = {
706                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
707                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
708                 },
709         },
710         {
711                 .callback = intel_no_lvds_dmi_callback,
712                 .ident = "Apple Mac Mini (Core 2 series)",
713                 .matches = {
714                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
715                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
716                 },
717         },
718         {
719                 .callback = intel_no_lvds_dmi_callback,
720                 .ident = "MSI IM-945GSE-A",
721                 .matches = {
722                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
723                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
724                 },
725         },
726         {
727                 .callback = intel_no_lvds_dmi_callback,
728                 .ident = "Dell Studio Hybrid",
729                 .matches = {
730                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
731                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
732                 },
733         },
734         {
735                 .callback = intel_no_lvds_dmi_callback,
736                 .ident = "AOpen Mini PC",
737                 .matches = {
738                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
739                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
740                 },
741         },
742         {
743                 .callback = intel_no_lvds_dmi_callback,
744                 .ident = "AOpen Mini PC MP915",
745                 .matches = {
746                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
747                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
748                 },
749         },
750         {
751                 .callback = intel_no_lvds_dmi_callback,
752                 .ident = "AOpen i915GMm-HFS",
753                 .matches = {
754                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
755                         DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
756                 },
757         },
758         {
759                 .callback = intel_no_lvds_dmi_callback,
760                 .ident = "AOpen i45GMx-I",
761                 .matches = {
762                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
763                         DMI_MATCH(DMI_BOARD_NAME, "i45GMx-I"),
764                 },
765         },
766         {
767                 .callback = intel_no_lvds_dmi_callback,
768                 .ident = "Aopen i945GTt-VFA",
769                 .matches = {
770                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
771                 },
772         },
773         {
774                 .callback = intel_no_lvds_dmi_callback,
775                 .ident = "Clientron U800",
776                 .matches = {
777                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
778                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
779                 },
780         },
781         {
782                 .callback = intel_no_lvds_dmi_callback,
783                 .ident = "Asus EeeBox PC EB1007",
784                 .matches = {
785                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
786                         DMI_MATCH(DMI_PRODUCT_NAME, "EB1007"),
787                 },
788         },
789         {
790                 .callback = intel_no_lvds_dmi_callback,
791                 .ident = "MSI Wind Box DC500",
792                 .matches = {
793                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
794                         DMI_MATCH(DMI_BOARD_NAME, "MS-7469"),
795                 },
796         },
797         {
798                 .callback = intel_no_lvds_dmi_callback,
799                 .ident = "ZOTAC ZBOXSD-ID12/ID13",
800                 .matches = {
801                         DMI_MATCH(DMI_BOARD_VENDOR, "ZOTAC"),
802                         DMI_MATCH(DMI_BOARD_NAME, "ZBOXSD-ID12/ID13"),
803                 },
804         },
805
806         { }     /* terminating entry */
807 };
808
809 /**
810  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
811  * @dev: drm device
812  * @connector: LVDS connector
813  *
814  * Find the reduced downclock for LVDS in EDID.
815  */
816 static void intel_find_lvds_downclock(struct drm_device *dev,
817                                       struct drm_display_mode *fixed_mode,
818                                       struct drm_connector *connector)
819 {
820         struct drm_i915_private *dev_priv = dev->dev_private;
821         struct drm_display_mode *scan;
822         int temp_downclock;
823
824         temp_downclock = fixed_mode->clock;
825         list_for_each_entry(scan, &connector->probed_modes, head) {
826                 /*
827                  * If one mode has the same resolution with the fixed_panel
828                  * mode while they have the different refresh rate, it means
829                  * that the reduced downclock is found for the LVDS. In such
830                  * case we can set the different FPx0/1 to dynamically select
831                  * between low and high frequency.
832                  */
833                 if (scan->hdisplay == fixed_mode->hdisplay &&
834                     scan->hsync_start == fixed_mode->hsync_start &&
835                     scan->hsync_end == fixed_mode->hsync_end &&
836                     scan->htotal == fixed_mode->htotal &&
837                     scan->vdisplay == fixed_mode->vdisplay &&
838                     scan->vsync_start == fixed_mode->vsync_start &&
839                     scan->vsync_end == fixed_mode->vsync_end &&
840                     scan->vtotal == fixed_mode->vtotal) {
841                         if (scan->clock < temp_downclock) {
842                                 /*
843                                  * The downclock is already found. But we
844                                  * expect to find the lower downclock.
845                                  */
846                                 temp_downclock = scan->clock;
847                         }
848                 }
849         }
850         if (temp_downclock < fixed_mode->clock && i915_lvds_downclock) {
851                 /* We found the downclock for LVDS. */
852                 dev_priv->lvds_downclock_avail = 1;
853                 dev_priv->lvds_downclock = temp_downclock;
854                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
855                               "Normal clock %dKhz, downclock %dKhz\n",
856                               fixed_mode->clock, temp_downclock);
857         }
858 }
859
860 /*
861  * Enumerate the child dev array parsed from VBT to check whether
862  * the LVDS is present.
863  * If it is present, return 1.
864  * If it is not present, return false.
865  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
866  */
867 static bool lvds_is_present_in_vbt(struct drm_device *dev,
868                                    u8 *i2c_pin)
869 {
870         struct drm_i915_private *dev_priv = dev->dev_private;
871         int i;
872
873         if (!dev_priv->child_dev_num)
874                 return true;
875
876         for (i = 0; i < dev_priv->child_dev_num; i++) {
877                 struct child_device_config *child = dev_priv->child_dev + i;
878
879                 /* If the device type is not LFP, continue.
880                  * We have to check both the new identifiers as well as the
881                  * old for compatibility with some BIOSes.
882                  */
883                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
884                     child->device_type != DEVICE_TYPE_LFP)
885                         continue;
886
887                 if (child->i2c_pin)
888                     *i2c_pin = child->i2c_pin;
889
890                 /* However, we cannot trust the BIOS writers to populate
891                  * the VBT correctly.  Since LVDS requires additional
892                  * information from AIM blocks, a non-zero addin offset is
893                  * a good indicator that the LVDS is actually present.
894                  */
895                 if (child->addin_offset)
896                         return true;
897
898                 /* But even then some BIOS writers perform some black magic
899                  * and instantiate the device without reference to any
900                  * additional data.  Trust that if the VBT was written into
901                  * the OpRegion then they have validated the LVDS's existence.
902                  */
903                 if (dev_priv->opregion.vbt)
904                         return true;
905         }
906
907         return false;
908 }
909
910 /**
911  * intel_lvds_init - setup LVDS connectors on this device
912  * @dev: drm device
913  *
914  * Create the connector, register the LVDS DDC bus, and try to figure out what
915  * modes we can display on the LVDS panel (if present).
916  */
917 bool intel_lvds_init(struct drm_device *dev)
918 {
919         struct drm_i915_private *dev_priv = dev->dev_private;
920         struct intel_lvds *intel_lvds;
921         struct intel_encoder *intel_encoder;
922         struct intel_connector *intel_connector;
923         struct drm_connector *connector;
924         struct drm_encoder *encoder;
925         struct drm_display_mode *scan; /* *modes, *bios_mode; */
926         struct drm_crtc *crtc;
927         u32 lvds;
928         int pipe;
929         u8 pin;
930
931         /* Skip init on machines we know falsely report LVDS */
932         if (dmi_check_system(intel_no_lvds))
933                 return false;
934
935         pin = GMBUS_PORT_PANEL;
936         if (!lvds_is_present_in_vbt(dev, &pin)) {
937                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
938                 return false;
939         }
940
941         if (HAS_PCH_SPLIT(dev)) {
942                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
943                         return false;
944                 if (dev_priv->edp.support) {
945                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
946                         return false;
947                 }
948         }
949
950         intel_lvds = kzalloc(sizeof(struct intel_lvds), GFP_KERNEL);
951         if (!intel_lvds) {
952                 return false;
953         }
954
955         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
956         if (!intel_connector) {
957                 kfree(intel_lvds);
958                 return false;
959         }
960
961         if (!HAS_PCH_SPLIT(dev)) {
962                 intel_lvds->pfit_control = I915_READ(PFIT_CONTROL);
963         }
964
965         intel_encoder = &intel_lvds->base;
966         encoder = &intel_encoder->base;
967         connector = &intel_connector->base;
968         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
969                            DRM_MODE_CONNECTOR_LVDS);
970
971         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
972                          DRM_MODE_ENCODER_LVDS);
973
974         intel_connector_attach_encoder(intel_connector, intel_encoder);
975         intel_encoder->type = INTEL_OUTPUT_LVDS;
976
977         intel_encoder->clone_mask = (1 << INTEL_LVDS_CLONE_BIT);
978         if (HAS_PCH_SPLIT(dev))
979                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
980         else
981                 intel_encoder->crtc_mask = (1 << 1);
982
983         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
984         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
985         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
986         connector->interlace_allowed = false;
987         connector->doublescan_allowed = false;
988
989         /* create the scaling mode property */
990         drm_mode_create_scaling_mode_property(dev);
991         /*
992          * the initial panel fitting mode will be FULL_SCREEN.
993          */
994
995         drm_connector_attach_property(&intel_connector->base,
996                                       dev->mode_config.scaling_mode_property,
997                                       DRM_MODE_SCALE_ASPECT);
998         intel_lvds->fitting_mode = DRM_MODE_SCALE_ASPECT;
999         /*
1000          * LVDS discovery:
1001          * 1) check for EDID on DDC
1002          * 2) check for VBT data
1003          * 3) check to see if LVDS is already on
1004          *    if none of the above, no panel
1005          * 4) make sure lid is open
1006          *    if closed, act like it's not there for now
1007          */
1008
1009         /*
1010          * Attempt to get the fixed panel mode from DDC.  Assume that the
1011          * preferred mode is the right one.
1012          */
1013         intel_lvds->edid = drm_get_edid(connector,
1014                                         &dev_priv->gmbus[pin].adapter);
1015         if (intel_lvds->edid) {
1016                 if (drm_add_edid_modes(connector,
1017                                        intel_lvds->edid)) {
1018                         drm_mode_connector_update_edid_property(connector,
1019                                                                 intel_lvds->edid);
1020                 } else {
1021                         kfree(intel_lvds->edid);
1022                         intel_lvds->edid = NULL;
1023                 }
1024         }
1025         if (!intel_lvds->edid) {
1026                 /* Didn't get an EDID, so
1027                  * Set wide sync ranges so we get all modes
1028                  * handed to valid_mode for checking
1029                  */
1030                 connector->display_info.min_vfreq = 0;
1031                 connector->display_info.max_vfreq = 200;
1032                 connector->display_info.min_hfreq = 0;
1033                 connector->display_info.max_hfreq = 200;
1034         }
1035
1036         list_for_each_entry(scan, &connector->probed_modes, head) {
1037                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
1038                         intel_lvds->fixed_mode =
1039                                 drm_mode_duplicate(dev, scan);
1040                         intel_find_lvds_downclock(dev,
1041                                                   intel_lvds->fixed_mode,
1042                                                   connector);
1043                         goto out;
1044                 }
1045         }
1046
1047         /* Failed to get EDID, what about VBT? */
1048         if (dev_priv->lfp_lvds_vbt_mode) {
1049                 intel_lvds->fixed_mode =
1050                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
1051                 if (intel_lvds->fixed_mode) {
1052                         intel_lvds->fixed_mode->type |=
1053                                 DRM_MODE_TYPE_PREFERRED;
1054                         goto out;
1055                 }
1056         }
1057
1058         /*
1059          * If we didn't get EDID, try checking if the panel is already turned
1060          * on.  If so, assume that whatever is currently programmed is the
1061          * correct mode.
1062          */
1063
1064         /* Ironlake: FIXME if still fail, not try pipe mode now */
1065         if (HAS_PCH_SPLIT(dev))
1066                 goto failed;
1067
1068         lvds = I915_READ(LVDS);
1069         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1070         crtc = intel_get_crtc_for_pipe(dev, pipe);
1071
1072         if (crtc && (lvds & LVDS_PORT_EN)) {
1073                 intel_lvds->fixed_mode = intel_crtc_mode_get(dev, crtc);
1074                 if (intel_lvds->fixed_mode) {
1075                         intel_lvds->fixed_mode->type |=
1076                                 DRM_MODE_TYPE_PREFERRED;
1077                         goto out;
1078                 }
1079         }
1080
1081         /* If we still don't have a mode after all that, give up. */
1082         if (!intel_lvds->fixed_mode)
1083                 goto failed;
1084
1085 out:
1086         if (HAS_PCH_SPLIT(dev)) {
1087                 u32 pwm;
1088
1089                 pipe = (I915_READ(PCH_LVDS) & LVDS_PIPEB_SELECT) ? 1 : 0;
1090
1091                 /* make sure PWM is enabled and locked to the LVDS pipe */
1092                 pwm = I915_READ(BLC_PWM_CPU_CTL2);
1093                 if (pipe == 0 && (pwm & PWM_PIPE_B))
1094                         I915_WRITE(BLC_PWM_CPU_CTL2, pwm & ~PWM_ENABLE);
1095                 if (pipe)
1096                         pwm |= PWM_PIPE_B;
1097                 else
1098                         pwm &= ~PWM_PIPE_B;
1099                 I915_WRITE(BLC_PWM_CPU_CTL2, pwm | PWM_ENABLE);
1100
1101                 pwm = I915_READ(BLC_PWM_PCH_CTL1);
1102                 pwm |= PWM_PCH_ENABLE;
1103                 I915_WRITE(BLC_PWM_PCH_CTL1, pwm);
1104                 /*
1105                  * Unlock registers and just
1106                  * leave them unlocked
1107                  */
1108                 I915_WRITE(PCH_PP_CONTROL,
1109                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
1110         } else {
1111                 /*
1112                  * Unlock registers and just
1113                  * leave them unlocked
1114                  */
1115                 I915_WRITE(PP_CONTROL,
1116                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
1117         }
1118         dev_priv->lid_notifier.notifier_call = intel_lid_notify;
1119         if (acpi_lid_notifier_register(&dev_priv->lid_notifier)) {
1120                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1121                 dev_priv->lid_notifier.notifier_call = NULL;
1122         }
1123         /* keep the LVDS connector */
1124         dev_priv->int_lvds_connector = connector;
1125         drm_sysfs_connector_add(connector);
1126
1127         intel_panel_setup_backlight(dev);
1128
1129         return true;
1130
1131 failed:
1132         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1133         drm_connector_cleanup(connector);
1134         drm_encoder_cleanup(encoder);
1135         kfree(intel_lvds);
1136         kfree(intel_connector);
1137         return false;
1138 }