drm/i915: Add no-lvds quirk for Supermicro X7SPA-H
[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, 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         mode->private_flags |= INTEL_MODE_CRTC_TIMINGS_SET;
192 }
193
194 static void
195 centre_vertically(struct drm_display_mode *mode,
196                   int height)
197 {
198         u32 border, sync_pos, blank_width, sync_width;
199
200         /* keep the vsync and vblank widths constant */
201         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
202         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
203         sync_pos = (blank_width - sync_width + 1) / 2;
204
205         border = (mode->vdisplay - height + 1) / 2;
206
207         mode->crtc_vdisplay = height;
208         mode->crtc_vblank_start = height + border;
209         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
210
211         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
212         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
213
214         mode->private_flags |= INTEL_MODE_CRTC_TIMINGS_SET;
215 }
216
217 static inline u32 panel_fitter_scaling(u32 source, u32 target)
218 {
219         /*
220          * Floating point operation is not supported. So the FACTOR
221          * is defined, which can avoid the floating point computation
222          * when calculating the panel ratio.
223          */
224 #define ACCURACY 12
225 #define FACTOR (1 << ACCURACY)
226         u32 ratio = source * FACTOR / target;
227         return (FACTOR * ratio + FACTOR/2) / FACTOR;
228 }
229
230 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
231                                   struct drm_display_mode *mode,
232                                   struct drm_display_mode *adjusted_mode)
233 {
234         struct drm_device *dev = encoder->dev;
235         struct drm_i915_private *dev_priv = dev->dev_private;
236         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
237         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
238         struct drm_encoder *tmp_encoder;
239         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
240         int pipe;
241
242         /* Should never happen!! */
243         if (INTEL_INFO(dev)->gen < 4 && intel_crtc->pipe == 0) {
244                 DRM_ERROR("Can't support LVDS on pipe A\n");
245                 return false;
246         }
247
248         /* Should never happen!! */
249         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, head) {
250                 if (tmp_encoder != encoder && tmp_encoder->crtc == encoder->crtc) {
251                         DRM_ERROR("Can't enable LVDS and another "
252                                "encoder on the same pipe\n");
253                         return false;
254                 }
255         }
256
257         /*
258          * We have timings from the BIOS for the panel, put them in
259          * to the adjusted mode.  The CRTC will be set up for this mode,
260          * with the panel scaling set up to source from the H/VDisplay
261          * of the original mode.
262          */
263         intel_fixed_panel_mode(intel_lvds->fixed_mode, adjusted_mode);
264
265         if (HAS_PCH_SPLIT(dev)) {
266                 intel_pch_panel_fitting(dev, intel_lvds->fitting_mode,
267                                         mode, adjusted_mode);
268                 return true;
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         for_each_pipe(pipe)
288                 I915_WRITE(BCLRPAT(pipe), 0);
289
290         drm_mode_set_crtcinfo(adjusted_mode, 0);
291
292         switch (intel_lvds->fitting_mode) {
293         case DRM_MODE_SCALE_CENTER:
294                 /*
295                  * For centered modes, we have to calculate border widths &
296                  * heights and modify the values programmed into the CRTC.
297                  */
298                 centre_horizontally(adjusted_mode, mode->hdisplay);
299                 centre_vertically(adjusted_mode, mode->vdisplay);
300                 border = LVDS_BORDER_ENABLE;
301                 break;
302
303         case DRM_MODE_SCALE_ASPECT:
304                 /* Scale but preserve the aspect ratio */
305                 if (INTEL_INFO(dev)->gen >= 4) {
306                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
307                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
308
309                         /* 965+ is easy, it does everything in hw */
310                         if (scaled_width > scaled_height)
311                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_PILLAR;
312                         else if (scaled_width < scaled_height)
313                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_LETTER;
314                         else if (adjusted_mode->hdisplay != mode->hdisplay)
315                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
316                 } else {
317                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
318                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
319                         /*
320                          * For earlier chips we have to calculate the scaling
321                          * ratio by hand and program it into the
322                          * PFIT_PGM_RATIO register
323                          */
324                         if (scaled_width > scaled_height) { /* pillar */
325                                 centre_horizontally(adjusted_mode, scaled_height / mode->vdisplay);
326
327                                 border = LVDS_BORDER_ENABLE;
328                                 if (mode->vdisplay != adjusted_mode->vdisplay) {
329                                         u32 bits = panel_fitter_scaling(mode->vdisplay, adjusted_mode->vdisplay);
330                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
331                                                             bits << PFIT_VERT_SCALE_SHIFT);
332                                         pfit_control |= (PFIT_ENABLE |
333                                                          VERT_INTERP_BILINEAR |
334                                                          HORIZ_INTERP_BILINEAR);
335                                 }
336                         } else if (scaled_width < scaled_height) { /* letter */
337                                 centre_vertically(adjusted_mode, scaled_width / mode->hdisplay);
338
339                                 border = LVDS_BORDER_ENABLE;
340                                 if (mode->hdisplay != adjusted_mode->hdisplay) {
341                                         u32 bits = panel_fitter_scaling(mode->hdisplay, adjusted_mode->hdisplay);
342                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
343                                                             bits << PFIT_VERT_SCALE_SHIFT);
344                                         pfit_control |= (PFIT_ENABLE |
345                                                          VERT_INTERP_BILINEAR |
346                                                          HORIZ_INTERP_BILINEAR);
347                                 }
348                         } else
349                                 /* Aspects match, Let hw scale both directions */
350                                 pfit_control |= (PFIT_ENABLE |
351                                                  VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
352                                                  VERT_INTERP_BILINEAR |
353                                                  HORIZ_INTERP_BILINEAR);
354                 }
355                 break;
356
357         case DRM_MODE_SCALE_FULLSCREEN:
358                 /*
359                  * Full scaling, even if it changes the aspect ratio.
360                  * Fortunately this is all done for us in hw.
361                  */
362                 if (mode->vdisplay != adjusted_mode->vdisplay ||
363                     mode->hdisplay != adjusted_mode->hdisplay) {
364                         pfit_control |= PFIT_ENABLE;
365                         if (INTEL_INFO(dev)->gen >= 4)
366                                 pfit_control |= PFIT_SCALING_AUTO;
367                         else
368                                 pfit_control |= (VERT_AUTO_SCALE |
369                                                  VERT_INTERP_BILINEAR |
370                                                  HORIZ_AUTO_SCALE |
371                                                  HORIZ_INTERP_BILINEAR);
372                 }
373                 break;
374
375         default:
376                 break;
377         }
378
379 out:
380         /* If not enabling scaling, be consistent and always use 0. */
381         if ((pfit_control & PFIT_ENABLE) == 0) {
382                 pfit_control = 0;
383                 pfit_pgm_ratios = 0;
384         }
385
386         /* Make sure pre-965 set dither correctly */
387         if (INTEL_INFO(dev)->gen < 4 && dev_priv->lvds_dither)
388                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
389
390         if (pfit_control != intel_lvds->pfit_control ||
391             pfit_pgm_ratios != intel_lvds->pfit_pgm_ratios) {
392                 intel_lvds->pfit_control = pfit_control;
393                 intel_lvds->pfit_pgm_ratios = pfit_pgm_ratios;
394                 intel_lvds->pfit_dirty = true;
395         }
396         dev_priv->lvds_border_bits = border;
397
398         /*
399          * XXX: It would be nice to support lower refresh rates on the
400          * panels to reduce power consumption, and perhaps match the
401          * user's requested refresh rate.
402          */
403
404         return true;
405 }
406
407 static void intel_lvds_prepare(struct drm_encoder *encoder)
408 {
409         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
410
411         /*
412          * Prior to Ironlake, we must disable the pipe if we want to adjust
413          * the panel fitter. However at all other times we can just reset
414          * the registers regardless.
415          */
416         if (!HAS_PCH_SPLIT(encoder->dev) && intel_lvds->pfit_dirty)
417                 intel_lvds_disable(intel_lvds);
418 }
419
420 static void intel_lvds_commit(struct drm_encoder *encoder)
421 {
422         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
423
424         /* Always do a full power on as we do not know what state
425          * we were left in.
426          */
427         intel_lvds_enable(intel_lvds);
428 }
429
430 static void intel_lvds_mode_set(struct drm_encoder *encoder,
431                                 struct drm_display_mode *mode,
432                                 struct drm_display_mode *adjusted_mode)
433 {
434         /*
435          * The LVDS pin pair will already have been turned on in the
436          * intel_crtc_mode_set since it has a large impact on the DPLL
437          * settings.
438          */
439 }
440
441 /**
442  * Detect the LVDS connection.
443  *
444  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
445  * connected and closed means disconnected.  We also send hotplug events as
446  * needed, using lid status notification from the input layer.
447  */
448 static enum drm_connector_status
449 intel_lvds_detect(struct drm_connector *connector, bool force)
450 {
451         struct drm_device *dev = connector->dev;
452         enum drm_connector_status status;
453
454         status = intel_panel_detect(dev);
455         if (status != connector_status_unknown)
456                 return status;
457
458         return connector_status_connected;
459 }
460
461 /**
462  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
463  */
464 static int intel_lvds_get_modes(struct drm_connector *connector)
465 {
466         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
467         struct drm_device *dev = connector->dev;
468         struct drm_display_mode *mode;
469
470         if (intel_lvds->edid)
471                 return drm_add_edid_modes(connector, intel_lvds->edid);
472
473         mode = drm_mode_duplicate(dev, intel_lvds->fixed_mode);
474         if (mode == NULL)
475                 return 0;
476
477         drm_mode_probed_add(connector, mode);
478         return 1;
479 }
480
481 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
482 {
483         DRM_DEBUG_KMS("Skipping forced modeset for %s\n", id->ident);
484         return 1;
485 }
486
487 /* The GPU hangs up on these systems if modeset is performed on LID open */
488 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
489         {
490                 .callback = intel_no_modeset_on_lid_dmi_callback,
491                 .ident = "Toshiba Tecra A11",
492                 .matches = {
493                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
494                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
495                 },
496         },
497
498         { }     /* terminating entry */
499 };
500
501 /*
502  * Lid events. Note the use of 'modeset_on_lid':
503  *  - we set it on lid close, and reset it on open
504  *  - we use it as a "only once" bit (ie we ignore
505  *    duplicate events where it was already properly
506  *    set/reset)
507  *  - the suspend/resume paths will also set it to
508  *    zero, since they restore the mode ("lid open").
509  */
510 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
511                             void *unused)
512 {
513         struct drm_i915_private *dev_priv =
514                 container_of(nb, struct drm_i915_private, lid_notifier);
515         struct drm_device *dev = dev_priv->dev;
516         struct drm_connector *connector = dev_priv->int_lvds_connector;
517
518         if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
519                 return NOTIFY_OK;
520
521         /*
522          * check and update the status of LVDS connector after receiving
523          * the LID nofication event.
524          */
525         if (connector)
526                 connector->status = connector->funcs->detect(connector,
527                                                              false);
528
529         /* Don't force modeset on machines where it causes a GPU lockup */
530         if (dmi_check_system(intel_no_modeset_on_lid))
531                 return NOTIFY_OK;
532         if (!acpi_lid_open()) {
533                 dev_priv->modeset_on_lid = 1;
534                 return NOTIFY_OK;
535         }
536
537         if (!dev_priv->modeset_on_lid)
538                 return NOTIFY_OK;
539
540         dev_priv->modeset_on_lid = 0;
541
542         mutex_lock(&dev->mode_config.mutex);
543         drm_helper_resume_force_mode(dev);
544         mutex_unlock(&dev->mode_config.mutex);
545
546         return NOTIFY_OK;
547 }
548
549 /**
550  * intel_lvds_destroy - unregister and free LVDS structures
551  * @connector: connector to free
552  *
553  * Unregister the DDC bus for this connector then free the driver private
554  * structure.
555  */
556 static void intel_lvds_destroy(struct drm_connector *connector)
557 {
558         struct drm_device *dev = connector->dev;
559         struct drm_i915_private *dev_priv = dev->dev_private;
560
561         intel_panel_destroy_backlight(dev);
562
563         if (dev_priv->lid_notifier.notifier_call)
564                 acpi_lid_notifier_unregister(&dev_priv->lid_notifier);
565         drm_sysfs_connector_remove(connector);
566         drm_connector_cleanup(connector);
567         kfree(connector);
568 }
569
570 static int intel_lvds_set_property(struct drm_connector *connector,
571                                    struct drm_property *property,
572                                    uint64_t value)
573 {
574         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
575         struct drm_device *dev = connector->dev;
576
577         if (property == dev->mode_config.scaling_mode_property) {
578                 struct drm_crtc *crtc = intel_lvds->base.base.crtc;
579
580                 if (value == DRM_MODE_SCALE_NONE) {
581                         DRM_DEBUG_KMS("no scaling not supported\n");
582                         return -EINVAL;
583                 }
584
585                 if (intel_lvds->fitting_mode == value) {
586                         /* the LVDS scaling property is not changed */
587                         return 0;
588                 }
589                 intel_lvds->fitting_mode = value;
590                 if (crtc && crtc->enabled) {
591                         /*
592                          * If the CRTC is enabled, the display will be changed
593                          * according to the new panel fitting mode.
594                          */
595                         drm_crtc_helper_set_mode(crtc, &crtc->mode,
596                                 crtc->x, crtc->y, crtc->fb);
597                 }
598         }
599
600         return 0;
601 }
602
603 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
604         .dpms = intel_lvds_dpms,
605         .mode_fixup = intel_lvds_mode_fixup,
606         .prepare = intel_lvds_prepare,
607         .mode_set = intel_lvds_mode_set,
608         .commit = intel_lvds_commit,
609 };
610
611 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
612         .get_modes = intel_lvds_get_modes,
613         .mode_valid = intel_lvds_mode_valid,
614         .best_encoder = intel_best_encoder,
615 };
616
617 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
618         .dpms = drm_helper_connector_dpms,
619         .detect = intel_lvds_detect,
620         .fill_modes = drm_helper_probe_single_connector_modes,
621         .set_property = intel_lvds_set_property,
622         .destroy = intel_lvds_destroy,
623 };
624
625 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
626         .destroy = intel_encoder_destroy,
627 };
628
629 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
630 {
631         DRM_DEBUG_KMS("Skipping LVDS initialization for %s\n", id->ident);
632         return 1;
633 }
634
635 /* These systems claim to have LVDS, but really don't */
636 static const struct dmi_system_id intel_no_lvds[] = {
637         {
638                 .callback = intel_no_lvds_dmi_callback,
639                 .ident = "Apple Mac Mini (Core series)",
640                 .matches = {
641                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
642                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
643                 },
644         },
645         {
646                 .callback = intel_no_lvds_dmi_callback,
647                 .ident = "Apple Mac Mini (Core 2 series)",
648                 .matches = {
649                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
650                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
651                 },
652         },
653         {
654                 .callback = intel_no_lvds_dmi_callback,
655                 .ident = "MSI IM-945GSE-A",
656                 .matches = {
657                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
658                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
659                 },
660         },
661         {
662                 .callback = intel_no_lvds_dmi_callback,
663                 .ident = "Dell Studio Hybrid",
664                 .matches = {
665                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
666                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
667                 },
668         },
669         {
670                 .callback = intel_no_lvds_dmi_callback,
671                 .ident = "Dell OptiPlex FX170",
672                 .matches = {
673                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
674                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex FX170"),
675                 },
676         },
677         {
678                 .callback = intel_no_lvds_dmi_callback,
679                 .ident = "AOpen Mini PC",
680                 .matches = {
681                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
682                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
683                 },
684         },
685         {
686                 .callback = intel_no_lvds_dmi_callback,
687                 .ident = "AOpen Mini PC MP915",
688                 .matches = {
689                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
690                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
691                 },
692         },
693         {
694                 .callback = intel_no_lvds_dmi_callback,
695                 .ident = "AOpen i915GMm-HFS",
696                 .matches = {
697                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
698                         DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
699                 },
700         },
701         {
702                 .callback = intel_no_lvds_dmi_callback,
703                 .ident = "AOpen i45GMx-I",
704                 .matches = {
705                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
706                         DMI_MATCH(DMI_BOARD_NAME, "i45GMx-I"),
707                 },
708         },
709         {
710                 .callback = intel_no_lvds_dmi_callback,
711                 .ident = "Aopen i945GTt-VFA",
712                 .matches = {
713                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
714                 },
715         },
716         {
717                 .callback = intel_no_lvds_dmi_callback,
718                 .ident = "Clientron U800",
719                 .matches = {
720                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
721                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
722                 },
723         },
724         {
725                 .callback = intel_no_lvds_dmi_callback,
726                 .ident = "Clientron E830",
727                 .matches = {
728                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
729                         DMI_MATCH(DMI_PRODUCT_NAME, "E830"),
730                 },
731         },
732         {
733                 .callback = intel_no_lvds_dmi_callback,
734                 .ident = "Asus EeeBox PC EB1007",
735                 .matches = {
736                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
737                         DMI_MATCH(DMI_PRODUCT_NAME, "EB1007"),
738                 },
739         },
740         {
741                 .callback = intel_no_lvds_dmi_callback,
742                 .ident = "Asus AT5NM10T-I",
743                 .matches = {
744                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
745                         DMI_MATCH(DMI_BOARD_NAME, "AT5NM10T-I"),
746                 },
747         },
748         {
749                 .callback = intel_no_lvds_dmi_callback,
750                 .ident = "Hewlett-Packard HP t5740e Thin Client",
751                 .matches = {
752                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
753                         DMI_MATCH(DMI_PRODUCT_NAME, "HP t5740e Thin Client"),
754                 },
755         },
756         {
757                 .callback = intel_no_lvds_dmi_callback,
758                 .ident = "Hewlett-Packard t5745",
759                 .matches = {
760                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
761                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5745"),
762                 },
763         },
764         {
765                 .callback = intel_no_lvds_dmi_callback,
766                 .ident = "Hewlett-Packard st5747",
767                 .matches = {
768                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
769                         DMI_MATCH(DMI_PRODUCT_NAME, "hp st5747"),
770                 },
771         },
772         {
773                 .callback = intel_no_lvds_dmi_callback,
774                 .ident = "MSI Wind Box DC500",
775                 .matches = {
776                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
777                         DMI_MATCH(DMI_BOARD_NAME, "MS-7469"),
778                 },
779         },
780         {
781                 .callback = intel_no_lvds_dmi_callback,
782                 .ident = "ZOTAC ZBOXSD-ID12/ID13",
783                 .matches = {
784                         DMI_MATCH(DMI_BOARD_VENDOR, "ZOTAC"),
785                         DMI_MATCH(DMI_BOARD_NAME, "ZBOXSD-ID12/ID13"),
786                 },
787         },
788         {
789                 .callback = intel_no_lvds_dmi_callback,
790                 .ident = "Gigabyte GA-D525TUD",
791                 .matches = {
792                         DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
793                         DMI_MATCH(DMI_BOARD_NAME, "D525TUD"),
794                 },
795         },
796         {
797                 .callback = intel_no_lvds_dmi_callback,
798                 .ident = "Supermicro X7SPA-H",
799                 .matches = {
800                         DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
801                         DMI_MATCH(DMI_PRODUCT_NAME, "X7SPA-H"),
802                 },
803         },
804
805         { }     /* terminating entry */
806 };
807
808 /**
809  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
810  * @dev: drm device
811  * @connector: LVDS connector
812  *
813  * Find the reduced downclock for LVDS in EDID.
814  */
815 static void intel_find_lvds_downclock(struct drm_device *dev,
816                                       struct drm_display_mode *fixed_mode,
817                                       struct drm_connector *connector)
818 {
819         struct drm_i915_private *dev_priv = dev->dev_private;
820         struct drm_display_mode *scan;
821         int temp_downclock;
822
823         temp_downclock = fixed_mode->clock;
824         list_for_each_entry(scan, &connector->probed_modes, head) {
825                 /*
826                  * If one mode has the same resolution with the fixed_panel
827                  * mode while they have the different refresh rate, it means
828                  * that the reduced downclock is found for the LVDS. In such
829                  * case we can set the different FPx0/1 to dynamically select
830                  * between low and high frequency.
831                  */
832                 if (scan->hdisplay == fixed_mode->hdisplay &&
833                     scan->hsync_start == fixed_mode->hsync_start &&
834                     scan->hsync_end == fixed_mode->hsync_end &&
835                     scan->htotal == fixed_mode->htotal &&
836                     scan->vdisplay == fixed_mode->vdisplay &&
837                     scan->vsync_start == fixed_mode->vsync_start &&
838                     scan->vsync_end == fixed_mode->vsync_end &&
839                     scan->vtotal == fixed_mode->vtotal) {
840                         if (scan->clock < temp_downclock) {
841                                 /*
842                                  * The downclock is already found. But we
843                                  * expect to find the lower downclock.
844                                  */
845                                 temp_downclock = scan->clock;
846                         }
847                 }
848         }
849         if (temp_downclock < fixed_mode->clock && i915_lvds_downclock) {
850                 /* We found the downclock for LVDS. */
851                 dev_priv->lvds_downclock_avail = 1;
852                 dev_priv->lvds_downclock = temp_downclock;
853                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
854                               "Normal clock %dKhz, downclock %dKhz\n",
855                               fixed_mode->clock, temp_downclock);
856         }
857 }
858
859 /*
860  * Enumerate the child dev array parsed from VBT to check whether
861  * the LVDS is present.
862  * If it is present, return 1.
863  * If it is not present, return false.
864  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
865  */
866 static bool lvds_is_present_in_vbt(struct drm_device *dev,
867                                    u8 *i2c_pin)
868 {
869         struct drm_i915_private *dev_priv = dev->dev_private;
870         int i;
871
872         if (!dev_priv->child_dev_num)
873                 return true;
874
875         for (i = 0; i < dev_priv->child_dev_num; i++) {
876                 struct child_device_config *child = dev_priv->child_dev + i;
877
878                 /* If the device type is not LFP, continue.
879                  * We have to check both the new identifiers as well as the
880                  * old for compatibility with some BIOSes.
881                  */
882                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
883                     child->device_type != DEVICE_TYPE_LFP)
884                         continue;
885
886                 if (child->i2c_pin)
887                     *i2c_pin = child->i2c_pin;
888
889                 /* However, we cannot trust the BIOS writers to populate
890                  * the VBT correctly.  Since LVDS requires additional
891                  * information from AIM blocks, a non-zero addin offset is
892                  * a good indicator that the LVDS is actually present.
893                  */
894                 if (child->addin_offset)
895                         return true;
896
897                 /* But even then some BIOS writers perform some black magic
898                  * and instantiate the device without reference to any
899                  * additional data.  Trust that if the VBT was written into
900                  * the OpRegion then they have validated the LVDS's existence.
901                  */
902                 if (dev_priv->opregion.vbt)
903                         return true;
904         }
905
906         return false;
907 }
908
909 static bool intel_lvds_supported(struct drm_device *dev)
910 {
911         /* With the introduction of the PCH we gained a dedicated
912          * LVDS presence pin, use it. */
913         if (HAS_PCH_SPLIT(dev))
914                 return true;
915
916         /* Otherwise LVDS was only attached to mobile products,
917          * except for the inglorious 830gm */
918         return IS_MOBILE(dev) && !IS_I830(dev);
919 }
920
921 /**
922  * intel_lvds_init - setup LVDS connectors on this device
923  * @dev: drm device
924  *
925  * Create the connector, register the LVDS DDC bus, and try to figure out what
926  * modes we can display on the LVDS panel (if present).
927  */
928 bool intel_lvds_init(struct drm_device *dev)
929 {
930         struct drm_i915_private *dev_priv = dev->dev_private;
931         struct intel_lvds *intel_lvds;
932         struct intel_encoder *intel_encoder;
933         struct intel_connector *intel_connector;
934         struct drm_connector *connector;
935         struct drm_encoder *encoder;
936         struct drm_display_mode *scan; /* *modes, *bios_mode; */
937         struct drm_crtc *crtc;
938         u32 lvds;
939         int pipe;
940         u8 pin;
941
942         if (!intel_lvds_supported(dev))
943                 return false;
944
945         /* Skip init on machines we know falsely report LVDS */
946         if (dmi_check_system(intel_no_lvds))
947                 return false;
948
949         pin = GMBUS_PORT_PANEL;
950         if (!lvds_is_present_in_vbt(dev, &pin)) {
951                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
952                 return false;
953         }
954
955         if (HAS_PCH_SPLIT(dev)) {
956                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
957                         return false;
958                 if (dev_priv->edp.support) {
959                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
960                         return false;
961                 }
962         }
963
964         intel_lvds = kzalloc(sizeof(struct intel_lvds), GFP_KERNEL);
965         if (!intel_lvds) {
966                 return false;
967         }
968
969         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
970         if (!intel_connector) {
971                 kfree(intel_lvds);
972                 return false;
973         }
974
975         if (!HAS_PCH_SPLIT(dev)) {
976                 intel_lvds->pfit_control = I915_READ(PFIT_CONTROL);
977         }
978
979         intel_encoder = &intel_lvds->base;
980         encoder = &intel_encoder->base;
981         connector = &intel_connector->base;
982         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
983                            DRM_MODE_CONNECTOR_LVDS);
984
985         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
986                          DRM_MODE_ENCODER_LVDS);
987
988         intel_connector_attach_encoder(intel_connector, intel_encoder);
989         intel_encoder->type = INTEL_OUTPUT_LVDS;
990
991         intel_encoder->clone_mask = (1 << INTEL_LVDS_CLONE_BIT);
992         if (HAS_PCH_SPLIT(dev))
993                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
994         else
995                 intel_encoder->crtc_mask = (1 << 1);
996
997         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
998         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
999         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
1000         connector->interlace_allowed = false;
1001         connector->doublescan_allowed = false;
1002
1003         /* create the scaling mode property */
1004         drm_mode_create_scaling_mode_property(dev);
1005         /*
1006          * the initial panel fitting mode will be FULL_SCREEN.
1007          */
1008
1009         drm_connector_attach_property(&intel_connector->base,
1010                                       dev->mode_config.scaling_mode_property,
1011                                       DRM_MODE_SCALE_ASPECT);
1012         intel_lvds->fitting_mode = DRM_MODE_SCALE_ASPECT;
1013         /*
1014          * LVDS discovery:
1015          * 1) check for EDID on DDC
1016          * 2) check for VBT data
1017          * 3) check to see if LVDS is already on
1018          *    if none of the above, no panel
1019          * 4) make sure lid is open
1020          *    if closed, act like it's not there for now
1021          */
1022
1023         /*
1024          * Attempt to get the fixed panel mode from DDC.  Assume that the
1025          * preferred mode is the right one.
1026          */
1027         intel_lvds->edid = drm_get_edid(connector,
1028                                         &dev_priv->gmbus[pin].adapter);
1029         if (intel_lvds->edid) {
1030                 if (drm_add_edid_modes(connector,
1031                                        intel_lvds->edid)) {
1032                         drm_mode_connector_update_edid_property(connector,
1033                                                                 intel_lvds->edid);
1034                 } else {
1035                         kfree(intel_lvds->edid);
1036                         intel_lvds->edid = NULL;
1037                 }
1038         }
1039         if (!intel_lvds->edid) {
1040                 /* Didn't get an EDID, so
1041                  * Set wide sync ranges so we get all modes
1042                  * handed to valid_mode for checking
1043                  */
1044                 connector->display_info.min_vfreq = 0;
1045                 connector->display_info.max_vfreq = 200;
1046                 connector->display_info.min_hfreq = 0;
1047                 connector->display_info.max_hfreq = 200;
1048         }
1049
1050         list_for_each_entry(scan, &connector->probed_modes, head) {
1051                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
1052                         intel_lvds->fixed_mode =
1053                                 drm_mode_duplicate(dev, scan);
1054                         intel_find_lvds_downclock(dev,
1055                                                   intel_lvds->fixed_mode,
1056                                                   connector);
1057                         goto out;
1058                 }
1059         }
1060
1061         /* Failed to get EDID, what about VBT? */
1062         if (dev_priv->lfp_lvds_vbt_mode) {
1063                 intel_lvds->fixed_mode =
1064                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
1065                 if (intel_lvds->fixed_mode) {
1066                         intel_lvds->fixed_mode->type |=
1067                                 DRM_MODE_TYPE_PREFERRED;
1068                         goto out;
1069                 }
1070         }
1071
1072         /*
1073          * If we didn't get EDID, try checking if the panel is already turned
1074          * on.  If so, assume that whatever is currently programmed is the
1075          * correct mode.
1076          */
1077
1078         /* Ironlake: FIXME if still fail, not try pipe mode now */
1079         if (HAS_PCH_SPLIT(dev))
1080                 goto failed;
1081
1082         lvds = I915_READ(LVDS);
1083         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1084         crtc = intel_get_crtc_for_pipe(dev, pipe);
1085
1086         if (crtc && (lvds & LVDS_PORT_EN)) {
1087                 intel_lvds->fixed_mode = intel_crtc_mode_get(dev, crtc);
1088                 if (intel_lvds->fixed_mode) {
1089                         intel_lvds->fixed_mode->type |=
1090                                 DRM_MODE_TYPE_PREFERRED;
1091                         goto out;
1092                 }
1093         }
1094
1095         /* If we still don't have a mode after all that, give up. */
1096         if (!intel_lvds->fixed_mode)
1097                 goto failed;
1098
1099 out:
1100         if (HAS_PCH_SPLIT(dev)) {
1101                 u32 pwm;
1102
1103                 pipe = (I915_READ(PCH_LVDS) & LVDS_PIPEB_SELECT) ? 1 : 0;
1104
1105                 /* make sure PWM is enabled and locked to the LVDS pipe */
1106                 pwm = I915_READ(BLC_PWM_CPU_CTL2);
1107                 if (pipe == 0 && (pwm & PWM_PIPE_B))
1108                         I915_WRITE(BLC_PWM_CPU_CTL2, pwm & ~PWM_ENABLE);
1109                 if (pipe)
1110                         pwm |= PWM_PIPE_B;
1111                 else
1112                         pwm &= ~PWM_PIPE_B;
1113                 I915_WRITE(BLC_PWM_CPU_CTL2, pwm | PWM_ENABLE);
1114
1115                 pwm = I915_READ(BLC_PWM_PCH_CTL1);
1116                 pwm |= PWM_PCH_ENABLE;
1117                 I915_WRITE(BLC_PWM_PCH_CTL1, pwm);
1118                 /*
1119                  * Unlock registers and just
1120                  * leave them unlocked
1121                  */
1122                 I915_WRITE(PCH_PP_CONTROL,
1123                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
1124         } else {
1125                 /*
1126                  * Unlock registers and just
1127                  * leave them unlocked
1128                  */
1129                 I915_WRITE(PP_CONTROL,
1130                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
1131         }
1132         dev_priv->lid_notifier.notifier_call = intel_lid_notify;
1133         if (acpi_lid_notifier_register(&dev_priv->lid_notifier)) {
1134                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1135                 dev_priv->lid_notifier.notifier_call = NULL;
1136         }
1137         /* keep the LVDS connector */
1138         dev_priv->int_lvds_connector = connector;
1139         drm_sysfs_connector_add(connector);
1140
1141         intel_panel_setup_backlight(dev);
1142
1143         return true;
1144
1145 failed:
1146         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1147         drm_connector_cleanup(connector);
1148         drm_encoder_cleanup(encoder);
1149         kfree(intel_lvds);
1150         kfree(intel_connector);
1151         return false;
1152 }