Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6] / 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 <linux/i2c.h>
31 #include "drmP.h"
32 #include "drm.h"
33 #include "drm_crtc.h"
34 #include "drm_edid.h"
35 #include "intel_drv.h"
36 #include "i915_drm.h"
37 #include "i915_drv.h"
38
39 /**
40  * Sets the backlight level.
41  *
42  * \param level backlight level, from 0 to intel_lvds_get_max_backlight().
43  */
44 static void intel_lvds_set_backlight(struct drm_device *dev, int level)
45 {
46         struct drm_i915_private *dev_priv = dev->dev_private;
47         u32 blc_pwm_ctl;
48
49         blc_pwm_ctl = I915_READ(BLC_PWM_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
50         I915_WRITE(BLC_PWM_CTL, (blc_pwm_ctl |
51                                  (level << BACKLIGHT_DUTY_CYCLE_SHIFT)));
52 }
53
54 /**
55  * Returns the maximum level of the backlight duty cycle field.
56  */
57 static u32 intel_lvds_get_max_backlight(struct drm_device *dev)
58 {
59         struct drm_i915_private *dev_priv = dev->dev_private;
60
61         return ((I915_READ(BLC_PWM_CTL) & BACKLIGHT_MODULATION_FREQ_MASK) >>
62                 BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
63 }
64
65 /**
66  * Sets the power state for the panel.
67  */
68 static void intel_lvds_set_power(struct drm_device *dev, bool on)
69 {
70         struct drm_i915_private *dev_priv = dev->dev_private;
71         u32 pp_status;
72
73         if (on) {
74                 I915_WRITE(PP_CONTROL, I915_READ(PP_CONTROL) |
75                            POWER_TARGET_ON);
76                 do {
77                         pp_status = I915_READ(PP_STATUS);
78                 } while ((pp_status & PP_ON) == 0);
79
80                 intel_lvds_set_backlight(dev, dev_priv->backlight_duty_cycle);
81         } else {
82                 intel_lvds_set_backlight(dev, 0);
83
84                 I915_WRITE(PP_CONTROL, I915_READ(PP_CONTROL) &
85                            ~POWER_TARGET_ON);
86                 do {
87                         pp_status = I915_READ(PP_STATUS);
88                 } while (pp_status & PP_ON);
89         }
90 }
91
92 static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)
93 {
94         struct drm_device *dev = encoder->dev;
95
96         if (mode == DRM_MODE_DPMS_ON)
97                 intel_lvds_set_power(dev, true);
98         else
99                 intel_lvds_set_power(dev, false);
100
101         /* XXX: We never power down the LVDS pairs. */
102 }
103
104 static void intel_lvds_save(struct drm_connector *connector)
105 {
106         struct drm_device *dev = connector->dev;
107         struct drm_i915_private *dev_priv = dev->dev_private;
108
109         dev_priv->savePP_ON = I915_READ(PP_ON_DELAYS);
110         dev_priv->savePP_OFF = I915_READ(PP_OFF_DELAYS);
111         dev_priv->savePP_CONTROL = I915_READ(PP_CONTROL);
112         dev_priv->savePP_DIVISOR = I915_READ(PP_DIVISOR);
113         dev_priv->saveBLC_PWM_CTL = I915_READ(BLC_PWM_CTL);
114         dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
115                                        BACKLIGHT_DUTY_CYCLE_MASK);
116
117         /*
118          * If the light is off at server startup, just make it full brightness
119          */
120         if (dev_priv->backlight_duty_cycle == 0)
121                 dev_priv->backlight_duty_cycle =
122                         intel_lvds_get_max_backlight(dev);
123 }
124
125 static void intel_lvds_restore(struct drm_connector *connector)
126 {
127         struct drm_device *dev = connector->dev;
128         struct drm_i915_private *dev_priv = dev->dev_private;
129
130         I915_WRITE(BLC_PWM_CTL, dev_priv->saveBLC_PWM_CTL);
131         I915_WRITE(PP_ON_DELAYS, dev_priv->savePP_ON);
132         I915_WRITE(PP_OFF_DELAYS, dev_priv->savePP_OFF);
133         I915_WRITE(PP_DIVISOR, dev_priv->savePP_DIVISOR);
134         I915_WRITE(PP_CONTROL, dev_priv->savePP_CONTROL);
135         if (dev_priv->savePP_CONTROL & POWER_TARGET_ON)
136                 intel_lvds_set_power(dev, true);
137         else
138                 intel_lvds_set_power(dev, false);
139 }
140
141 static int intel_lvds_mode_valid(struct drm_connector *connector,
142                                  struct drm_display_mode *mode)
143 {
144         struct drm_device *dev = connector->dev;
145         struct drm_i915_private *dev_priv = dev->dev_private;
146         struct drm_display_mode *fixed_mode = dev_priv->panel_fixed_mode;
147
148         if (fixed_mode) {
149                 if (mode->hdisplay > fixed_mode->hdisplay)
150                         return MODE_PANEL;
151                 if (mode->vdisplay > fixed_mode->vdisplay)
152                         return MODE_PANEL;
153         }
154
155         return MODE_OK;
156 }
157
158 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
159                                   struct drm_display_mode *mode,
160                                   struct drm_display_mode *adjusted_mode)
161 {
162         struct drm_device *dev = encoder->dev;
163         struct drm_i915_private *dev_priv = dev->dev_private;
164         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
165         struct drm_encoder *tmp_encoder;
166
167         /* Should never happen!! */
168         if (!IS_I965G(dev) && intel_crtc->pipe == 0) {
169                 printk(KERN_ERR "Can't support LVDS on pipe A\n");
170                 return false;
171         }
172
173         /* Should never happen!! */
174         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, head) {
175                 if (tmp_encoder != encoder && tmp_encoder->crtc == encoder->crtc) {
176                         printk(KERN_ERR "Can't enable LVDS and another "
177                                "encoder on the same pipe\n");
178                         return false;
179                 }
180         }
181
182         /*
183          * If we have timings from the BIOS for the panel, put them in
184          * to the adjusted mode.  The CRTC will be set up for this mode,
185          * with the panel scaling set up to source from the H/VDisplay
186          * of the original mode.
187          */
188         if (dev_priv->panel_fixed_mode != NULL) {
189                 adjusted_mode->hdisplay = dev_priv->panel_fixed_mode->hdisplay;
190                 adjusted_mode->hsync_start =
191                         dev_priv->panel_fixed_mode->hsync_start;
192                 adjusted_mode->hsync_end =
193                         dev_priv->panel_fixed_mode->hsync_end;
194                 adjusted_mode->htotal = dev_priv->panel_fixed_mode->htotal;
195                 adjusted_mode->vdisplay = dev_priv->panel_fixed_mode->vdisplay;
196                 adjusted_mode->vsync_start =
197                         dev_priv->panel_fixed_mode->vsync_start;
198                 adjusted_mode->vsync_end =
199                         dev_priv->panel_fixed_mode->vsync_end;
200                 adjusted_mode->vtotal = dev_priv->panel_fixed_mode->vtotal;
201                 adjusted_mode->clock = dev_priv->panel_fixed_mode->clock;
202                 drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);
203         }
204
205         /*
206          * XXX: It would be nice to support lower refresh rates on the
207          * panels to reduce power consumption, and perhaps match the
208          * user's requested refresh rate.
209          */
210
211         return true;
212 }
213
214 static void intel_lvds_prepare(struct drm_encoder *encoder)
215 {
216         struct drm_device *dev = encoder->dev;
217         struct drm_i915_private *dev_priv = dev->dev_private;
218
219         dev_priv->saveBLC_PWM_CTL = I915_READ(BLC_PWM_CTL);
220         dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
221                                        BACKLIGHT_DUTY_CYCLE_MASK);
222
223         intel_lvds_set_power(dev, false);
224 }
225
226 static void intel_lvds_commit( struct drm_encoder *encoder)
227 {
228         struct drm_device *dev = encoder->dev;
229         struct drm_i915_private *dev_priv = dev->dev_private;
230
231         if (dev_priv->backlight_duty_cycle == 0)
232                 dev_priv->backlight_duty_cycle =
233                         intel_lvds_get_max_backlight(dev);
234
235         intel_lvds_set_power(dev, true);
236 }
237
238 static void intel_lvds_mode_set(struct drm_encoder *encoder,
239                                 struct drm_display_mode *mode,
240                                 struct drm_display_mode *adjusted_mode)
241 {
242         struct drm_device *dev = encoder->dev;
243         struct drm_i915_private *dev_priv = dev->dev_private;
244         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
245         u32 pfit_control;
246
247         /*
248          * The LVDS pin pair will already have been turned on in the
249          * intel_crtc_mode_set since it has a large impact on the DPLL
250          * settings.
251          */
252
253         /*
254          * Enable automatic panel scaling so that non-native modes fill the
255          * screen.  Should be enabled before the pipe is enabled, according to
256          * register description and PRM.
257          */
258         if (mode->hdisplay != adjusted_mode->hdisplay ||
259             mode->vdisplay != adjusted_mode->vdisplay)
260                 pfit_control = (PFIT_ENABLE | VERT_AUTO_SCALE |
261                                 HORIZ_AUTO_SCALE | VERT_INTERP_BILINEAR |
262                                 HORIZ_INTERP_BILINEAR);
263         else
264                 pfit_control = 0;
265
266         if (!IS_I965G(dev)) {
267                 if (dev_priv->panel_wants_dither)
268                         pfit_control |= PANEL_8TO6_DITHER_ENABLE;
269         }
270         else
271                 pfit_control |= intel_crtc->pipe << PFIT_PIPE_SHIFT;
272
273         I915_WRITE(PFIT_CONTROL, pfit_control);
274 }
275
276 /**
277  * Detect the LVDS connection.
278  *
279  * This always returns CONNECTOR_STATUS_CONNECTED.  This connector should only have
280  * been set up if the LVDS was actually connected anyway.
281  */
282 static enum drm_connector_status intel_lvds_detect(struct drm_connector *connector)
283 {
284         return connector_status_connected;
285 }
286
287 /**
288  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
289  */
290 static int intel_lvds_get_modes(struct drm_connector *connector)
291 {
292         struct drm_device *dev = connector->dev;
293         struct intel_output *intel_output = to_intel_output(connector);
294         struct drm_i915_private *dev_priv = dev->dev_private;
295         int ret = 0;
296
297         ret = intel_ddc_get_modes(intel_output);
298
299         if (ret)
300                 return ret;
301
302         /* Didn't get an EDID, so
303          * Set wide sync ranges so we get all modes
304          * handed to valid_mode for checking
305          */
306         connector->display_info.min_vfreq = 0;
307         connector->display_info.max_vfreq = 200;
308         connector->display_info.min_hfreq = 0;
309         connector->display_info.max_hfreq = 200;
310
311         if (dev_priv->panel_fixed_mode != NULL) {
312                 struct drm_display_mode *mode;
313
314                 mutex_unlock(&dev->mode_config.mutex);
315                 mode = drm_mode_duplicate(dev, dev_priv->panel_fixed_mode);
316                 drm_mode_probed_add(connector, mode);
317                 mutex_unlock(&dev->mode_config.mutex);
318
319                 return 1;
320         }
321
322         return 0;
323 }
324
325 /**
326  * intel_lvds_destroy - unregister and free LVDS structures
327  * @connector: connector to free
328  *
329  * Unregister the DDC bus for this connector then free the driver private
330  * structure.
331  */
332 static void intel_lvds_destroy(struct drm_connector *connector)
333 {
334         struct intel_output *intel_output = to_intel_output(connector);
335
336         if (intel_output->ddc_bus)
337                 intel_i2c_destroy(intel_output->ddc_bus);
338         drm_sysfs_connector_remove(connector);
339         drm_connector_cleanup(connector);
340         kfree(connector);
341 }
342
343 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
344         .dpms = intel_lvds_dpms,
345         .mode_fixup = intel_lvds_mode_fixup,
346         .prepare = intel_lvds_prepare,
347         .mode_set = intel_lvds_mode_set,
348         .commit = intel_lvds_commit,
349 };
350
351 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
352         .get_modes = intel_lvds_get_modes,
353         .mode_valid = intel_lvds_mode_valid,
354         .best_encoder = intel_best_encoder,
355 };
356
357 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
358         .save = intel_lvds_save,
359         .restore = intel_lvds_restore,
360         .detect = intel_lvds_detect,
361         .fill_modes = drm_helper_probe_single_connector_modes,
362         .destroy = intel_lvds_destroy,
363 };
364
365
366 static void intel_lvds_enc_destroy(struct drm_encoder *encoder)
367 {
368         drm_encoder_cleanup(encoder);
369 }
370
371 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
372         .destroy = intel_lvds_enc_destroy,
373 };
374
375
376
377 /**
378  * intel_lvds_init - setup LVDS connectors on this device
379  * @dev: drm device
380  *
381  * Create the connector, register the LVDS DDC bus, and try to figure out what
382  * modes we can display on the LVDS panel (if present).
383  */
384 void intel_lvds_init(struct drm_device *dev)
385 {
386         struct drm_i915_private *dev_priv = dev->dev_private;
387         struct intel_output *intel_output;
388         struct drm_connector *connector;
389         struct drm_encoder *encoder;
390         struct drm_display_mode *scan; /* *modes, *bios_mode; */
391         struct drm_crtc *crtc;
392         u32 lvds;
393         int pipe;
394
395         intel_output = kzalloc(sizeof(struct intel_output), GFP_KERNEL);
396         if (!intel_output) {
397                 return;
398         }
399
400         connector = &intel_output->base;
401         encoder = &intel_output->enc;
402         drm_connector_init(dev, &intel_output->base, &intel_lvds_connector_funcs,
403                            DRM_MODE_CONNECTOR_LVDS);
404
405         drm_encoder_init(dev, &intel_output->enc, &intel_lvds_enc_funcs,
406                          DRM_MODE_ENCODER_LVDS);
407
408         drm_mode_connector_attach_encoder(&intel_output->base, &intel_output->enc);
409         intel_output->type = INTEL_OUTPUT_LVDS;
410
411         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
412         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
413         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
414         connector->interlace_allowed = false;
415         connector->doublescan_allowed = false;
416
417
418         /*
419          * LVDS discovery:
420          * 1) check for EDID on DDC
421          * 2) check for VBT data
422          * 3) check to see if LVDS is already on
423          *    if none of the above, no panel
424          * 4) make sure lid is open
425          *    if closed, act like it's not there for now
426          */
427
428         /* Set up the DDC bus. */
429         intel_output->ddc_bus = intel_i2c_create(dev, GPIOC, "LVDSDDC_C");
430         if (!intel_output->ddc_bus) {
431                 dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
432                            "failed.\n");
433                 goto failed;
434         }
435
436         /*
437          * Attempt to get the fixed panel mode from DDC.  Assume that the
438          * preferred mode is the right one.
439          */
440         intel_ddc_get_modes(intel_output);
441
442         list_for_each_entry(scan, &connector->probed_modes, head) {
443                 mutex_lock(&dev->mode_config.mutex);
444                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
445                         dev_priv->panel_fixed_mode =
446                                 drm_mode_duplicate(dev, scan);
447                         mutex_unlock(&dev->mode_config.mutex);
448                         goto out; /* FIXME: check for quirks */
449                 }
450                 mutex_unlock(&dev->mode_config.mutex);
451         }
452
453         /* Failed to get EDID, what about VBT? */
454         if (dev_priv->vbt_mode) {
455                 mutex_lock(&dev->mode_config.mutex);
456                 dev_priv->panel_fixed_mode =
457                         drm_mode_duplicate(dev, dev_priv->vbt_mode);
458                 mutex_unlock(&dev->mode_config.mutex);
459         }
460
461         /*
462          * If we didn't get EDID, try checking if the panel is already turned
463          * on.  If so, assume that whatever is currently programmed is the
464          * correct mode.
465          */
466         lvds = I915_READ(LVDS);
467         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
468         crtc = intel_get_crtc_from_pipe(dev, pipe);
469
470         if (crtc && (lvds & LVDS_PORT_EN)) {
471                 dev_priv->panel_fixed_mode = intel_crtc_mode_get(dev, crtc);
472                 if (dev_priv->panel_fixed_mode) {
473                         dev_priv->panel_fixed_mode->type |=
474                                 DRM_MODE_TYPE_PREFERRED;
475                         goto out; /* FIXME: check for quirks */
476                 }
477         }
478
479         /* If we still don't have a mode after all that, give up. */
480         if (!dev_priv->panel_fixed_mode)
481                 goto failed;
482
483         /* FIXME: detect aopen & mac mini type stuff automatically? */
484         /*
485          * Blacklist machines with BIOSes that list an LVDS panel without
486          * actually having one.
487          */
488         if (IS_I945GM(dev)) {
489                 /* aopen mini pc */
490                 if (dev->pdev->subsystem_vendor == 0xa0a0)
491                         goto failed;
492
493                 if ((dev->pdev->subsystem_vendor == 0x8086) &&
494                     (dev->pdev->subsystem_device == 0x7270)) {
495                         /* It's a Mac Mini or Macbook Pro.
496                          *
497                          * Apple hardware is out to get us.  The macbook pro
498                          * has a real LVDS panel, but the mac mini does not,
499                          * and they have the same device IDs.  We'll
500                          * distinguish by panel size, on the assumption
501                          * that Apple isn't about to make any machines with an
502                          * 800x600 display.
503                          */
504
505                         if (dev_priv->panel_fixed_mode != NULL &&
506                             dev_priv->panel_fixed_mode->hdisplay == 800 &&
507                             dev_priv->panel_fixed_mode->vdisplay == 600) {
508                                 DRM_DEBUG("Suspected Mac Mini, ignoring the LVDS\n");
509                                 goto failed;
510                         }
511                 }
512         }
513
514
515 out:
516         drm_sysfs_connector_add(connector);
517         return;
518
519 failed:
520         DRM_DEBUG("No LVDS modes found, disabling.\n");
521         if (intel_output->ddc_bus)
522                 intel_i2c_destroy(intel_output->ddc_bus);
523         drm_connector_cleanup(connector);
524         kfree(connector);
525 }