drm/i915: use GMBUS to manage i2c links
[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         bool edid_good;
48
49         int fitting_mode;
50         u32 pfit_control;
51         u32 pfit_pgm_ratios;
52         bool pfit_dirty;
53
54         struct drm_display_mode *fixed_mode;
55 };
56
57 static struct intel_lvds *to_intel_lvds(struct drm_encoder *encoder)
58 {
59         return container_of(encoder, struct intel_lvds, base.base);
60 }
61
62 static struct intel_lvds *intel_attached_lvds(struct drm_connector *connector)
63 {
64         return container_of(intel_attached_encoder(connector),
65                             struct intel_lvds, base);
66 }
67
68 /**
69  * Sets the power state for the panel.
70  */
71 static void intel_lvds_set_power(struct intel_lvds *intel_lvds, bool on)
72 {
73         struct drm_device *dev = intel_lvds->base.base.dev;
74         struct drm_i915_private *dev_priv = dev->dev_private;
75         u32 ctl_reg, lvds_reg;
76
77         if (HAS_PCH_SPLIT(dev)) {
78                 ctl_reg = PCH_PP_CONTROL;
79                 lvds_reg = PCH_LVDS;
80         } else {
81                 ctl_reg = PP_CONTROL;
82                 lvds_reg = LVDS;
83         }
84
85         if (on) {
86                 I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
87                 I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
88                 intel_panel_set_backlight(dev, dev_priv->backlight_level);
89         } else {
90                 dev_priv->backlight_level = intel_panel_get_backlight(dev);
91
92                 intel_panel_set_backlight(dev, 0);
93                 I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
94
95                 if (intel_lvds->pfit_control) {
96                         if (wait_for((I915_READ(PP_STATUS) & PP_ON) == 0, 1000))
97                                 DRM_ERROR("timed out waiting for panel to power off\n");
98                         I915_WRITE(PFIT_CONTROL, 0);
99                         intel_lvds->pfit_control = 0;
100                 }
101
102                 I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
103         }
104         POSTING_READ(lvds_reg);
105 }
106
107 static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)
108 {
109         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
110
111         if (mode == DRM_MODE_DPMS_ON)
112                 intel_lvds_set_power(intel_lvds, true);
113         else
114                 intel_lvds_set_power(intel_lvds, false);
115
116         /* XXX: We never power down the LVDS pairs. */
117 }
118
119 static int intel_lvds_mode_valid(struct drm_connector *connector,
120                                  struct drm_display_mode *mode)
121 {
122         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
123         struct drm_display_mode *fixed_mode = intel_lvds->fixed_mode;
124
125         if (mode->hdisplay > fixed_mode->hdisplay)
126                 return MODE_PANEL;
127         if (mode->vdisplay > fixed_mode->vdisplay)
128                 return MODE_PANEL;
129
130         return MODE_OK;
131 }
132
133 static void
134 centre_horizontally(struct drm_display_mode *mode,
135                     int width)
136 {
137         u32 border, sync_pos, blank_width, sync_width;
138
139         /* keep the hsync and hblank widths constant */
140         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
141         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
142         sync_pos = (blank_width - sync_width + 1) / 2;
143
144         border = (mode->hdisplay - width + 1) / 2;
145         border += border & 1; /* make the border even */
146
147         mode->crtc_hdisplay = width;
148         mode->crtc_hblank_start = width + border;
149         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
150
151         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
152         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
153 }
154
155 static void
156 centre_vertically(struct drm_display_mode *mode,
157                   int height)
158 {
159         u32 border, sync_pos, blank_width, sync_width;
160
161         /* keep the vsync and vblank widths constant */
162         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
163         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
164         sync_pos = (blank_width - sync_width + 1) / 2;
165
166         border = (mode->vdisplay - height + 1) / 2;
167
168         mode->crtc_vdisplay = height;
169         mode->crtc_vblank_start = height + border;
170         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
171
172         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
173         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
174 }
175
176 static inline u32 panel_fitter_scaling(u32 source, u32 target)
177 {
178         /*
179          * Floating point operation is not supported. So the FACTOR
180          * is defined, which can avoid the floating point computation
181          * when calculating the panel ratio.
182          */
183 #define ACCURACY 12
184 #define FACTOR (1 << ACCURACY)
185         u32 ratio = source * FACTOR / target;
186         return (FACTOR * ratio + FACTOR/2) / FACTOR;
187 }
188
189 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
190                                   struct drm_display_mode *mode,
191                                   struct drm_display_mode *adjusted_mode)
192 {
193         struct drm_device *dev = encoder->dev;
194         struct drm_i915_private *dev_priv = dev->dev_private;
195         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
196         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
197         struct drm_encoder *tmp_encoder;
198         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
199
200         /* Should never happen!! */
201         if (!IS_I965G(dev) && intel_crtc->pipe == 0) {
202                 DRM_ERROR("Can't support LVDS on pipe A\n");
203                 return false;
204         }
205
206         /* Should never happen!! */
207         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, head) {
208                 if (tmp_encoder != encoder && tmp_encoder->crtc == encoder->crtc) {
209                         DRM_ERROR("Can't enable LVDS and another "
210                                "encoder on the same pipe\n");
211                         return false;
212                 }
213         }
214
215         /*
216          * We have timings from the BIOS for the panel, put them in
217          * to the adjusted mode.  The CRTC will be set up for this mode,
218          * with the panel scaling set up to source from the H/VDisplay
219          * of the original mode.
220          */
221         intel_fixed_panel_mode(intel_lvds->fixed_mode, adjusted_mode);
222
223         if (HAS_PCH_SPLIT(dev)) {
224                 intel_pch_panel_fitting(dev, intel_lvds->fitting_mode,
225                                         mode, adjusted_mode);
226                 return true;
227         }
228
229         /* Make sure pre-965s set dither correctly */
230         if (!IS_I965G(dev)) {
231                 if (dev_priv->panel_wants_dither || dev_priv->lvds_dither)
232                         pfit_control |= PANEL_8TO6_DITHER_ENABLE;
233         }
234
235         /* Native modes don't need fitting */
236         if (adjusted_mode->hdisplay == mode->hdisplay &&
237             adjusted_mode->vdisplay == mode->vdisplay)
238                 goto out;
239
240         /* 965+ wants fuzzy fitting */
241         if (IS_I965G(dev))
242                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
243                                  PFIT_FILTER_FUZZY);
244
245         /*
246          * Enable automatic panel scaling for non-native modes so that they fill
247          * the screen.  Should be enabled before the pipe is enabled, according
248          * to register description and PRM.
249          * Change the value here to see the borders for debugging
250          */
251         I915_WRITE(BCLRPAT_A, 0);
252         I915_WRITE(BCLRPAT_B, 0);
253
254         switch (intel_lvds->fitting_mode) {
255         case DRM_MODE_SCALE_CENTER:
256                 /*
257                  * For centered modes, we have to calculate border widths &
258                  * heights and modify the values programmed into the CRTC.
259                  */
260                 centre_horizontally(adjusted_mode, mode->hdisplay);
261                 centre_vertically(adjusted_mode, mode->vdisplay);
262                 border = LVDS_BORDER_ENABLE;
263                 break;
264
265         case DRM_MODE_SCALE_ASPECT:
266                 /* Scale but preserve the aspect ratio */
267                 if (IS_I965G(dev)) {
268                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
269                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
270
271                         pfit_control |= PFIT_ENABLE;
272                         /* 965+ is easy, it does everything in hw */
273                         if (scaled_width > scaled_height)
274                                 pfit_control |= PFIT_SCALING_PILLAR;
275                         else if (scaled_width < scaled_height)
276                                 pfit_control |= PFIT_SCALING_LETTER;
277                         else
278                                 pfit_control |= PFIT_SCALING_AUTO;
279                 } else {
280                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
281                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
282                         /*
283                          * For earlier chips we have to calculate the scaling
284                          * ratio by hand and program it into the
285                          * PFIT_PGM_RATIO register
286                          */
287                         if (scaled_width > scaled_height) { /* pillar */
288                                 centre_horizontally(adjusted_mode, scaled_height / mode->vdisplay);
289
290                                 border = LVDS_BORDER_ENABLE;
291                                 if (mode->vdisplay != adjusted_mode->vdisplay) {
292                                         u32 bits = panel_fitter_scaling(mode->vdisplay, adjusted_mode->vdisplay);
293                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
294                                                             bits << PFIT_VERT_SCALE_SHIFT);
295                                         pfit_control |= (PFIT_ENABLE |
296                                                          VERT_INTERP_BILINEAR |
297                                                          HORIZ_INTERP_BILINEAR);
298                                 }
299                         } else if (scaled_width < scaled_height) { /* letter */
300                                 centre_vertically(adjusted_mode, scaled_width / mode->hdisplay);
301
302                                 border = LVDS_BORDER_ENABLE;
303                                 if (mode->hdisplay != adjusted_mode->hdisplay) {
304                                         u32 bits = panel_fitter_scaling(mode->hdisplay, adjusted_mode->hdisplay);
305                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
306                                                             bits << PFIT_VERT_SCALE_SHIFT);
307                                         pfit_control |= (PFIT_ENABLE |
308                                                          VERT_INTERP_BILINEAR |
309                                                          HORIZ_INTERP_BILINEAR);
310                                 }
311                         } else
312                                 /* Aspects match, Let hw scale both directions */
313                                 pfit_control |= (PFIT_ENABLE |
314                                                  VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
315                                                  VERT_INTERP_BILINEAR |
316                                                  HORIZ_INTERP_BILINEAR);
317                 }
318                 break;
319
320         case DRM_MODE_SCALE_FULLSCREEN:
321                 /*
322                  * Full scaling, even if it changes the aspect ratio.
323                  * Fortunately this is all done for us in hw.
324                  */
325                 pfit_control |= PFIT_ENABLE;
326                 if (IS_I965G(dev))
327                         pfit_control |= PFIT_SCALING_AUTO;
328                 else
329                         pfit_control |= (VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
330                                          VERT_INTERP_BILINEAR |
331                                          HORIZ_INTERP_BILINEAR);
332                 break;
333
334         default:
335                 break;
336         }
337
338 out:
339         if (pfit_control != intel_lvds->pfit_control ||
340             pfit_pgm_ratios != intel_lvds->pfit_pgm_ratios) {
341                 intel_lvds->pfit_control = pfit_control;
342                 intel_lvds->pfit_pgm_ratios = pfit_pgm_ratios;
343                 intel_lvds->pfit_dirty = true;
344         }
345         dev_priv->lvds_border_bits = border;
346
347         /*
348          * XXX: It would be nice to support lower refresh rates on the
349          * panels to reduce power consumption, and perhaps match the
350          * user's requested refresh rate.
351          */
352
353         return true;
354 }
355
356 static void intel_lvds_prepare(struct drm_encoder *encoder)
357 {
358         struct drm_device *dev = encoder->dev;
359         struct drm_i915_private *dev_priv = dev->dev_private;
360         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
361
362         dev_priv->backlight_level = intel_panel_get_backlight(dev);
363
364         /* We try to do the minimum that is necessary in order to unlock
365          * the registers for mode setting.
366          *
367          * On Ironlake, this is quite simple as we just set the unlock key
368          * and ignore all subtleties. (This may cause some issues...)
369          *
370          * Prior to Ironlake, we must disable the pipe if we want to adjust
371          * the panel fitter. However at all other times we can just reset
372          * the registers regardless.
373          */
374
375         if (HAS_PCH_SPLIT(dev)) {
376                 I915_WRITE(PCH_PP_CONTROL,
377                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
378         } else if (intel_lvds->pfit_dirty) {
379                 I915_WRITE(PP_CONTROL,
380                            I915_READ(PP_CONTROL) & ~POWER_TARGET_ON);
381                 I915_WRITE(LVDS, I915_READ(LVDS) & ~LVDS_PORT_EN);
382         } else {
383                 I915_WRITE(PP_CONTROL,
384                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
385         }
386 }
387
388 static void intel_lvds_commit(struct drm_encoder *encoder)
389 {
390         struct drm_device *dev = encoder->dev;
391         struct drm_i915_private *dev_priv = dev->dev_private;
392         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
393
394         if (dev_priv->backlight_level == 0)
395                 dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
396
397         /* Undo any unlocking done in prepare to prevent accidental
398          * adjustment of the registers.
399          */
400         if (HAS_PCH_SPLIT(dev)) {
401                 u32 val = I915_READ(PCH_PP_CONTROL);
402                 if ((val & PANEL_UNLOCK_REGS) == PANEL_UNLOCK_REGS)
403                         I915_WRITE(PCH_PP_CONTROL, val & 0x3);
404         } else {
405                 u32 val = I915_READ(PP_CONTROL);
406                 if ((val & PANEL_UNLOCK_REGS) == PANEL_UNLOCK_REGS)
407                         I915_WRITE(PP_CONTROL, val & 0x3);
408         }
409
410         /* Always do a full power on as we do not know what state
411          * we were left in.
412          */
413         intel_lvds_set_power(intel_lvds, true);
414 }
415
416 static void intel_lvds_mode_set(struct drm_encoder *encoder,
417                                 struct drm_display_mode *mode,
418                                 struct drm_display_mode *adjusted_mode)
419 {
420         struct drm_device *dev = encoder->dev;
421         struct drm_i915_private *dev_priv = dev->dev_private;
422         struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
423
424         /*
425          * The LVDS pin pair will already have been turned on in the
426          * intel_crtc_mode_set since it has a large impact on the DPLL
427          * settings.
428          */
429
430         if (HAS_PCH_SPLIT(dev))
431                 return;
432
433         if (!intel_lvds->pfit_dirty)
434                 return;
435
436         /*
437          * Enable automatic panel scaling so that non-native modes fill the
438          * screen.  Should be enabled before the pipe is enabled, according to
439          * register description and PRM.
440          */
441         if (wait_for((I915_READ(PP_STATUS) & PP_ON) == 0, 1000))
442                 DRM_ERROR("timed out waiting for panel to power off\n");
443
444         I915_WRITE(PFIT_PGM_RATIOS, intel_lvds->pfit_pgm_ratios);
445         I915_WRITE(PFIT_CONTROL, intel_lvds->pfit_control);
446         intel_lvds->pfit_dirty = false;
447 }
448
449 /**
450  * Detect the LVDS connection.
451  *
452  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
453  * connected and closed means disconnected.  We also send hotplug events as
454  * needed, using lid status notification from the input layer.
455  */
456 static enum drm_connector_status intel_lvds_detect(struct drm_connector *connector)
457 {
458         struct drm_device *dev = connector->dev;
459         enum drm_connector_status status = connector_status_connected;
460
461         /* ACPI lid methods were generally unreliable in this generation, so
462          * don't even bother.
463          */
464         if (IS_GEN2(dev) || IS_GEN3(dev))
465                 return connector_status_connected;
466
467         return status;
468 }
469
470 /**
471  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
472  */
473 static int intel_lvds_get_modes(struct drm_connector *connector)
474 {
475         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
476         struct drm_device *dev = connector->dev;
477         struct drm_i915_private *dev_priv = dev->dev_private;
478         struct drm_display_mode *mode;
479
480         if (intel_lvds->edid_good) {
481                 int ret = intel_ddc_get_modes(connector,
482                                               &dev_priv->gmbus[GMBUS_PORT_PANEL].adapter);
483                 if (ret)
484                         return ret;
485         }
486
487         mode = drm_mode_duplicate(dev, intel_lvds->fixed_mode);
488         if (mode == 0)
489                 return 0;
490
491         drm_mode_probed_add(connector, mode);
492         return 1;
493 }
494
495 static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
496 {
497         DRM_DEBUG_KMS("Skipping forced modeset for %s\n", id->ident);
498         return 1;
499 }
500
501 /* The GPU hangs up on these systems if modeset is performed on LID open */
502 static const struct dmi_system_id intel_no_modeset_on_lid[] = {
503         {
504                 .callback = intel_no_modeset_on_lid_dmi_callback,
505                 .ident = "Toshiba Tecra A11",
506                 .matches = {
507                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
508                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
509                 },
510         },
511
512         { }     /* terminating entry */
513 };
514
515 /*
516  * Lid events. Note the use of 'modeset_on_lid':
517  *  - we set it on lid close, and reset it on open
518  *  - we use it as a "only once" bit (ie we ignore
519  *    duplicate events where it was already properly
520  *    set/reset)
521  *  - the suspend/resume paths will also set it to
522  *    zero, since they restore the mode ("lid open").
523  */
524 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
525                             void *unused)
526 {
527         struct drm_i915_private *dev_priv =
528                 container_of(nb, struct drm_i915_private, lid_notifier);
529         struct drm_device *dev = dev_priv->dev;
530         struct drm_connector *connector = dev_priv->int_lvds_connector;
531
532         /*
533          * check and update the status of LVDS connector after receiving
534          * the LID nofication event.
535          */
536         if (connector)
537                 connector->status = connector->funcs->detect(connector);
538         /* Don't force modeset on machines where it causes a GPU lockup */
539         if (dmi_check_system(intel_no_modeset_on_lid))
540                 return NOTIFY_OK;
541         if (!acpi_lid_open()) {
542                 dev_priv->modeset_on_lid = 1;
543                 return NOTIFY_OK;
544         }
545
546         if (!dev_priv->modeset_on_lid)
547                 return NOTIFY_OK;
548
549         dev_priv->modeset_on_lid = 0;
550
551         mutex_lock(&dev->mode_config.mutex);
552         drm_helper_resume_force_mode(dev);
553         mutex_unlock(&dev->mode_config.mutex);
554
555         return NOTIFY_OK;
556 }
557
558 /**
559  * intel_lvds_destroy - unregister and free LVDS structures
560  * @connector: connector to free
561  *
562  * Unregister the DDC bus for this connector then free the driver private
563  * structure.
564  */
565 static void intel_lvds_destroy(struct drm_connector *connector)
566 {
567         struct drm_device *dev = connector->dev;
568         struct drm_i915_private *dev_priv = dev->dev_private;
569
570         if (dev_priv->lid_notifier.notifier_call)
571                 acpi_lid_notifier_unregister(&dev_priv->lid_notifier);
572         drm_sysfs_connector_remove(connector);
573         drm_connector_cleanup(connector);
574         kfree(connector);
575 }
576
577 static int intel_lvds_set_property(struct drm_connector *connector,
578                                    struct drm_property *property,
579                                    uint64_t value)
580 {
581         struct intel_lvds *intel_lvds = intel_attached_lvds(connector);
582         struct drm_device *dev = connector->dev;
583
584         if (property == dev->mode_config.scaling_mode_property) {
585                 struct drm_crtc *crtc = intel_lvds->base.base.crtc;
586
587                 if (value == DRM_MODE_SCALE_NONE) {
588                         DRM_DEBUG_KMS("no scaling not supported\n");
589                         return -EINVAL;
590                 }
591
592                 if (intel_lvds->fitting_mode == value) {
593                         /* the LVDS scaling property is not changed */
594                         return 0;
595                 }
596                 intel_lvds->fitting_mode = value;
597                 if (crtc && crtc->enabled) {
598                         /*
599                          * If the CRTC is enabled, the display will be changed
600                          * according to the new panel fitting mode.
601                          */
602                         drm_crtc_helper_set_mode(crtc, &crtc->mode,
603                                 crtc->x, crtc->y, crtc->fb);
604                 }
605         }
606
607         return 0;
608 }
609
610 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
611         .dpms = intel_lvds_dpms,
612         .mode_fixup = intel_lvds_mode_fixup,
613         .prepare = intel_lvds_prepare,
614         .mode_set = intel_lvds_mode_set,
615         .commit = intel_lvds_commit,
616 };
617
618 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
619         .get_modes = intel_lvds_get_modes,
620         .mode_valid = intel_lvds_mode_valid,
621         .best_encoder = intel_best_encoder,
622 };
623
624 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
625         .dpms = drm_helper_connector_dpms,
626         .detect = intel_lvds_detect,
627         .fill_modes = drm_helper_probe_single_connector_modes,
628         .set_property = intel_lvds_set_property,
629         .destroy = intel_lvds_destroy,
630 };
631
632 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
633         .destroy = intel_encoder_destroy,
634 };
635
636 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
637 {
638         DRM_DEBUG_KMS("Skipping LVDS initialization for %s\n", id->ident);
639         return 1;
640 }
641
642 /* These systems claim to have LVDS, but really don't */
643 static const struct dmi_system_id intel_no_lvds[] = {
644         {
645                 .callback = intel_no_lvds_dmi_callback,
646                 .ident = "Apple Mac Mini (Core series)",
647                 .matches = {
648                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
649                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
650                 },
651         },
652         {
653                 .callback = intel_no_lvds_dmi_callback,
654                 .ident = "Apple Mac Mini (Core 2 series)",
655                 .matches = {
656                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
657                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
658                 },
659         },
660         {
661                 .callback = intel_no_lvds_dmi_callback,
662                 .ident = "MSI IM-945GSE-A",
663                 .matches = {
664                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
665                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
666                 },
667         },
668         {
669                 .callback = intel_no_lvds_dmi_callback,
670                 .ident = "Dell Studio Hybrid",
671                 .matches = {
672                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
673                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
674                 },
675         },
676         {
677                 .callback = intel_no_lvds_dmi_callback,
678                 .ident = "AOpen Mini PC",
679                 .matches = {
680                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
681                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
682                 },
683         },
684         {
685                 .callback = intel_no_lvds_dmi_callback,
686                 .ident = "AOpen Mini PC MP915",
687                 .matches = {
688                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
689                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
690                 },
691         },
692         {
693                 .callback = intel_no_lvds_dmi_callback,
694                 .ident = "Aopen i945GTt-VFA",
695                 .matches = {
696                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
697                 },
698         },
699         {
700                 .callback = intel_no_lvds_dmi_callback,
701                 .ident = "Clientron U800",
702                 .matches = {
703                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
704                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
705                 },
706         },
707
708         { }     /* terminating entry */
709 };
710
711 /**
712  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
713  * @dev: drm device
714  * @connector: LVDS connector
715  *
716  * Find the reduced downclock for LVDS in EDID.
717  */
718 static void intel_find_lvds_downclock(struct drm_device *dev,
719                                       struct drm_display_mode *fixed_mode,
720                                       struct drm_connector *connector)
721 {
722         struct drm_i915_private *dev_priv = dev->dev_private;
723         struct drm_display_mode *scan;
724         int temp_downclock;
725
726         temp_downclock = fixed_mode->clock;
727         list_for_each_entry(scan, &connector->probed_modes, head) {
728                 /*
729                  * If one mode has the same resolution with the fixed_panel
730                  * mode while they have the different refresh rate, it means
731                  * that the reduced downclock is found for the LVDS. In such
732                  * case we can set the different FPx0/1 to dynamically select
733                  * between low and high frequency.
734                  */
735                 if (scan->hdisplay == fixed_mode->hdisplay &&
736                     scan->hsync_start == fixed_mode->hsync_start &&
737                     scan->hsync_end == fixed_mode->hsync_end &&
738                     scan->htotal == fixed_mode->htotal &&
739                     scan->vdisplay == fixed_mode->vdisplay &&
740                     scan->vsync_start == fixed_mode->vsync_start &&
741                     scan->vsync_end == fixed_mode->vsync_end &&
742                     scan->vtotal == fixed_mode->vtotal) {
743                         if (scan->clock < temp_downclock) {
744                                 /*
745                                  * The downclock is already found. But we
746                                  * expect to find the lower downclock.
747                                  */
748                                 temp_downclock = scan->clock;
749                         }
750                 }
751         }
752         if (temp_downclock < fixed_mode->clock && i915_lvds_downclock) {
753                 /* We found the downclock for LVDS. */
754                 dev_priv->lvds_downclock_avail = 1;
755                 dev_priv->lvds_downclock = temp_downclock;
756                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
757                               "Normal clock %dKhz, downclock %dKhz\n",
758                               fixed_mode->clock, temp_downclock);
759         }
760 }
761
762 /*
763  * Enumerate the child dev array parsed from VBT to check whether
764  * the LVDS is present.
765  * If it is present, return 1.
766  * If it is not present, return false.
767  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
768  */
769 static bool lvds_is_present_in_vbt(struct drm_device *dev)
770 {
771         struct drm_i915_private *dev_priv = dev->dev_private;
772         int i;
773
774         if (!dev_priv->child_dev_num)
775                 return true;
776
777         for (i = 0; i < dev_priv->child_dev_num; i++) {
778                 struct child_device_config *child = dev_priv->child_dev + i;
779
780                 /* If the device type is not LFP, continue.
781                  * We have to check both the new identifiers as well as the
782                  * old for compatibility with some BIOSes.
783                  */
784                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
785                     child->device_type != DEVICE_TYPE_LFP)
786                         continue;
787
788                 /* However, we cannot trust the BIOS writers to populate
789                  * the VBT correctly.  Since LVDS requires additional
790                  * information from AIM blocks, a non-zero addin offset is
791                  * a good indicator that the LVDS is actually present.
792                  */
793                 if (child->addin_offset)
794                         return true;
795
796                 /* But even then some BIOS writers perform some black magic
797                  * and instantiate the device without reference to any
798                  * additional data.  Trust that if the VBT was written into
799                  * the OpRegion then they have validated the LVDS's existence.
800                  */
801                 if (dev_priv->opregion.vbt)
802                         return true;
803         }
804
805         return false;
806 }
807
808 /**
809  * intel_lvds_init - setup LVDS connectors on this device
810  * @dev: drm device
811  *
812  * Create the connector, register the LVDS DDC bus, and try to figure out what
813  * modes we can display on the LVDS panel (if present).
814  */
815 void intel_lvds_init(struct drm_device *dev)
816 {
817         struct drm_i915_private *dev_priv = dev->dev_private;
818         struct intel_lvds *intel_lvds;
819         struct intel_encoder *intel_encoder;
820         struct intel_connector *intel_connector;
821         struct drm_connector *connector;
822         struct drm_encoder *encoder;
823         struct drm_display_mode *scan; /* *modes, *bios_mode; */
824         struct drm_crtc *crtc;
825         u32 lvds;
826         int pipe, gpio = GPIOC;
827
828         /* Skip init on machines we know falsely report LVDS */
829         if (dmi_check_system(intel_no_lvds))
830                 return;
831
832         if (!lvds_is_present_in_vbt(dev)) {
833                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
834                 return;
835         }
836
837         if (HAS_PCH_SPLIT(dev)) {
838                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
839                         return;
840                 if (dev_priv->edp_support) {
841                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
842                         return;
843                 }
844                 gpio = PCH_GPIOC;
845         }
846
847         intel_lvds = kzalloc(sizeof(struct intel_lvds), GFP_KERNEL);
848         if (!intel_lvds) {
849                 return;
850         }
851
852         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
853         if (!intel_connector) {
854                 kfree(intel_lvds);
855                 return;
856         }
857
858         if (!HAS_PCH_SPLIT(dev)) {
859                 intel_lvds->pfit_control = I915_READ(PFIT_CONTROL);
860         }
861
862         intel_encoder = &intel_lvds->base;
863         encoder = &intel_encoder->base;
864         connector = &intel_connector->base;
865         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
866                            DRM_MODE_CONNECTOR_LVDS);
867
868         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
869                          DRM_MODE_ENCODER_LVDS);
870
871         intel_connector_attach_encoder(intel_connector, intel_encoder);
872         intel_encoder->type = INTEL_OUTPUT_LVDS;
873
874         intel_encoder->clone_mask = (1 << INTEL_LVDS_CLONE_BIT);
875         intel_encoder->crtc_mask = (1 << 1);
876         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
877         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
878         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
879         connector->interlace_allowed = false;
880         connector->doublescan_allowed = false;
881
882         /* create the scaling mode property */
883         drm_mode_create_scaling_mode_property(dev);
884         /*
885          * the initial panel fitting mode will be FULL_SCREEN.
886          */
887
888         drm_connector_attach_property(&intel_connector->base,
889                                       dev->mode_config.scaling_mode_property,
890                                       DRM_MODE_SCALE_ASPECT);
891         intel_lvds->fitting_mode = DRM_MODE_SCALE_ASPECT;
892         /*
893          * LVDS discovery:
894          * 1) check for EDID on DDC
895          * 2) check for VBT data
896          * 3) check to see if LVDS is already on
897          *    if none of the above, no panel
898          * 4) make sure lid is open
899          *    if closed, act like it's not there for now
900          */
901
902         /*
903          * Attempt to get the fixed panel mode from DDC.  Assume that the
904          * preferred mode is the right one.
905          */
906         intel_lvds->edid_good = true;
907         if (!intel_ddc_get_modes(connector, &dev_priv->gmbus[GMBUS_PORT_PANEL].adapter))
908                 intel_lvds->edid_good = false;
909
910         if (!intel_lvds->edid_good) {
911                 /* Didn't get an EDID, so
912                  * Set wide sync ranges so we get all modes
913                  * handed to valid_mode for checking
914                  */
915                 connector->display_info.min_vfreq = 0;
916                 connector->display_info.max_vfreq = 200;
917                 connector->display_info.min_hfreq = 0;
918                 connector->display_info.max_hfreq = 200;
919         }
920
921         list_for_each_entry(scan, &connector->probed_modes, head) {
922                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
923                         intel_lvds->fixed_mode =
924                                 drm_mode_duplicate(dev, scan);
925                         intel_find_lvds_downclock(dev,
926                                                   intel_lvds->fixed_mode,
927                                                   connector);
928                         goto out;
929                 }
930         }
931
932         /* Failed to get EDID, what about VBT? */
933         if (dev_priv->lfp_lvds_vbt_mode) {
934                 intel_lvds->fixed_mode =
935                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
936                 if (intel_lvds->fixed_mode) {
937                         intel_lvds->fixed_mode->type |=
938                                 DRM_MODE_TYPE_PREFERRED;
939                         goto out;
940                 }
941         }
942
943         /*
944          * If we didn't get EDID, try checking if the panel is already turned
945          * on.  If so, assume that whatever is currently programmed is the
946          * correct mode.
947          */
948
949         /* Ironlake: FIXME if still fail, not try pipe mode now */
950         if (HAS_PCH_SPLIT(dev))
951                 goto failed;
952
953         lvds = I915_READ(LVDS);
954         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
955         crtc = intel_get_crtc_for_pipe(dev, pipe);
956
957         if (crtc && (lvds & LVDS_PORT_EN)) {
958                 intel_lvds->fixed_mode = intel_crtc_mode_get(dev, crtc);
959                 if (intel_lvds->fixed_mode) {
960                         intel_lvds->fixed_mode->type |=
961                                 DRM_MODE_TYPE_PREFERRED;
962                         goto out;
963                 }
964         }
965
966         /* If we still don't have a mode after all that, give up. */
967         if (!intel_lvds->fixed_mode)
968                 goto failed;
969
970 out:
971         if (HAS_PCH_SPLIT(dev)) {
972                 u32 pwm;
973                 /* make sure PWM is enabled */
974                 pwm = I915_READ(BLC_PWM_CPU_CTL2);
975                 pwm |= (PWM_ENABLE | PWM_PIPE_B);
976                 I915_WRITE(BLC_PWM_CPU_CTL2, pwm);
977
978                 pwm = I915_READ(BLC_PWM_PCH_CTL1);
979                 pwm |= PWM_PCH_ENABLE;
980                 I915_WRITE(BLC_PWM_PCH_CTL1, pwm);
981         }
982         dev_priv->lid_notifier.notifier_call = intel_lid_notify;
983         if (acpi_lid_notifier_register(&dev_priv->lid_notifier)) {
984                 DRM_DEBUG_KMS("lid notifier registration failed\n");
985                 dev_priv->lid_notifier.notifier_call = NULL;
986         }
987         /* keep the LVDS connector */
988         dev_priv->int_lvds_connector = connector;
989         drm_sysfs_connector_add(connector);
990         return;
991
992 failed:
993         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
994         drm_connector_cleanup(connector);
995         drm_encoder_cleanup(encoder);
996         kfree(intel_lvds);
997         kfree(intel_connector);
998 }