summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/i915/intel_lvds.c
blob: 2fafdcc108fe5161cef9e16862fdad2c8c6fd550 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
/*
 * Copyright © 2006-2007 Intel Corporation
 * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *	Eric Anholt <eric@anholt.net>
 *      Dave Airlie <airlied@linux.ie>
 *      Jesse Barnes <jesse.barnes@intel.com>
 */

#include <linux/i2c.h>
#include "drmP.h"
#include "drm.h"
#include "drm_crtc.h"
#include "drm_edid.h"
#include "intel_drv.h"
#include "i915_drm.h"
#include "i915_drv.h"

/**
 * Sets the backlight level.
 *
 * \param level backlight level, from 0 to intel_lvds_get_max_backlight().
 */
static void intel_lvds_set_backlight(struct drm_device *dev, int level)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 blc_pwm_ctl;

	blc_pwm_ctl = I915_READ(BLC_PWM_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
	I915_WRITE(BLC_PWM_CTL, (blc_pwm_ctl |
				 (level << BACKLIGHT_DUTY_CYCLE_SHIFT)));
}

/**
 * Returns the maximum level of the backlight duty cycle field.
 */
static u32 intel_lvds_get_max_backlight(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;

	return ((I915_READ(BLC_PWM_CTL) & BACKLIGHT_MODULATION_FREQ_MASK) >>
		BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
}

/**
 * Sets the power state for the panel.
 */
static void intel_lvds_set_power(struct drm_device *dev, bool on)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 pp_status;

	if (on) {
		I915_WRITE(PP_CONTROL, I915_READ(PP_CONTROL) |
			   POWER_TARGET_ON);
		do {
			pp_status = I915_READ(PP_STATUS);
		} while ((pp_status & PP_ON) == 0);

		intel_lvds_set_backlight(dev, dev_priv->backlight_duty_cycle);
	} else {
		intel_lvds_set_backlight(dev, 0);

		I915_WRITE(PP_CONTROL, I915_READ(PP_CONTROL) &
			   ~POWER_TARGET_ON);
		do {
			pp_status = I915_READ(PP_STATUS);
		} while (pp_status & PP_ON);
	}
}

static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)
{
	struct drm_device *dev = encoder->dev;

	if (mode == DRM_MODE_DPMS_ON)
		intel_lvds_set_power(dev, true);
	else
		intel_lvds_set_power(dev, false);

	/* XXX: We never power down the LVDS pairs. */
}

static void intel_lvds_save(struct drm_connector *connector)
{
	struct drm_device *dev = connector->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;

	dev_priv->savePP_ON = I915_READ(PP_ON_DELAYS);
	dev_priv->savePP_OFF = I915_READ(PP_OFF_DELAYS);
	dev_priv->savePP_CONTROL = I915_READ(PP_CONTROL);
	dev_priv->savePP_DIVISOR = I915_READ(PP_DIVISOR);
	dev_priv->saveBLC_PWM_CTL = I915_READ(BLC_PWM_CTL);
	dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
				       BACKLIGHT_DUTY_CYCLE_MASK);

	/*
	 * If the light is off at server startup, just make it full brightness
	 */
	if (dev_priv->backlight_duty_cycle == 0)
		dev_priv->backlight_duty_cycle =
			intel_lvds_get_max_backlight(dev);
}

static void intel_lvds_restore(struct drm_connector *connector)
{
	struct drm_device *dev = connector->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;

	I915_WRITE(BLC_PWM_CTL, dev_priv->saveBLC_PWM_CTL);
	I915_WRITE(PP_ON_DELAYS, dev_priv->savePP_ON);
	I915_WRITE(PP_OFF_DELAYS, dev_priv->savePP_OFF);
	I915_WRITE(PP_DIVISOR, dev_priv->savePP_DIVISOR);
	I915_WRITE(PP_CONTROL, dev_priv->savePP_CONTROL);
	if (dev_priv->savePP_CONTROL & POWER_TARGET_ON)
		intel_lvds_set_power(dev, true);
	else
		intel_lvds_set_power(dev, false);
}

static int intel_lvds_mode_valid(struct drm_connector *connector,
				 struct drm_display_mode *mode)
{
	struct drm_device *dev = connector->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_display_mode *fixed_mode = dev_priv->panel_fixed_mode;

	if (fixed_mode)	{
		if (mode->hdisplay > fixed_mode->hdisplay)
			return MODE_PANEL;
		if (mode->vdisplay > fixed_mode->vdisplay)
			return MODE_PANEL;
	}

	return MODE_OK;
}

static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
				  struct drm_display_mode *mode,
				  struct drm_display_mode *adjusted_mode)
{
	struct drm_device *dev = encoder->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
	struct drm_encoder *tmp_encoder;

	/* Should never happen!! */
	if (!IS_I965G(dev) && intel_crtc->pipe == 0) {
		printk(KERN_ERR "Can't support LVDS on pipe A\n");
		return false;
	}

	/* Should never happen!! */
	list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, head) {
		if (tmp_encoder != encoder && tmp_encoder->crtc == encoder->crtc) {
			printk(KERN_ERR "Can't enable LVDS and another "
			       "encoder on the same pipe\n");
			return false;
		}
	}

	/*
	 * If we have timings from the BIOS for the panel, put them in
	 * to the adjusted mode.  The CRTC will be set up for this mode,
	 * with the panel scaling set up to source from the H/VDisplay
	 * of the original mode.
	 */
	if (dev_priv->panel_fixed_mode != NULL) {
		adjusted_mode->hdisplay = dev_priv->panel_fixed_mode->hdisplay;
		adjusted_mode->hsync_start =
			dev_priv->panel_fixed_mode->hsync_start;
		adjusted_mode->hsync_end =
			dev_priv->panel_fixed_mode->hsync_end;
		adjusted_mode->htotal = dev_priv->panel_fixed_mode->htotal;
		adjusted_mode->vdisplay = dev_priv->panel_fixed_mode->vdisplay;
		adjusted_mode->vsync_start =
			dev_priv->panel_fixed_mode->vsync_start;
		adjusted_mode->vsync_end =
			dev_priv->panel_fixed_mode->vsync_end;
		adjusted_mode->vtotal = dev_priv->panel_fixed_mode->vtotal;
		adjusted_mode->clock = dev_priv->panel_fixed_mode->clock;
		drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);
	}

	/*
	 * XXX: It would be nice to support lower refresh rates on the
	 * panels to reduce power consumption, and perhaps match the
	 * user's requested refresh rate.
	 */

	return true;
}

static void intel_lvds_prepare(struct drm_encoder *encoder)
{
	struct drm_device *dev = encoder->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;

	dev_priv->saveBLC_PWM_CTL = I915_READ(BLC_PWM_CTL);
	dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
				       BACKLIGHT_DUTY_CYCLE_MASK);

	intel_lvds_set_power(dev, false);
}

static void intel_lvds_commit( struct drm_encoder *encoder)
{
	struct drm_device *dev = encoder->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;

	if (dev_priv->backlight_duty_cycle == 0)
		dev_priv->backlight_duty_cycle =
			intel_lvds_get_max_backlight(dev);

	intel_lvds_set_power(dev, true);
}

static void intel_lvds_mode_set(struct drm_encoder *encoder,
				struct drm_display_mode *mode,
				struct drm_display_mode *adjusted_mode)
{
	struct drm_device *dev = encoder->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
	u32 pfit_control;

	/*
	 * The LVDS pin pair will already have been turned on in the
	 * intel_crtc_mode_set since it has a large impact on the DPLL
	 * settings.
	 */

	/*
	 * Enable automatic panel scaling so that non-native modes fill the
	 * screen.  Should be enabled before the pipe is enabled, according to
	 * register description and PRM.
	 */
	if (mode->hdisplay != adjusted_mode->hdisplay ||
	    mode->vdisplay != adjusted_mode->vdisplay)
		pfit_control = (PFIT_ENABLE | VERT_AUTO_SCALE |
				HORIZ_AUTO_SCALE | VERT_INTERP_BILINEAR |
				HORIZ_INTERP_BILINEAR);
	else
		pfit_control = 0;

	if (!IS_I965G(dev)) {
		if (dev_priv->panel_wants_dither)
			pfit_control |= PANEL_8TO6_DITHER_ENABLE;
	}
	else
		pfit_control |= intel_crtc->pipe << PFIT_PIPE_SHIFT;

	I915_WRITE(PFIT_CONTROL, pfit_control);
}

/**
 * Detect the LVDS connection.
 *
 * This always returns CONNECTOR_STATUS_CONNECTED.  This connector should only have
 * been set up if the LVDS was actually connected anyway.
 */
static enum drm_connector_status intel_lvds_detect(struct drm_connector *connector)
{
	return connector_status_connected;
}

/**
 * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 */
static int intel_lvds_get_modes(struct drm_connector *connector)
{
	struct drm_device *dev = connector->dev;
	struct intel_output *intel_output = to_intel_output(connector);
	struct drm_i915_private *dev_priv = dev->dev_private;
	int ret = 0;

	ret = intel_ddc_get_modes(intel_output);

	if (ret)
		return ret;

	/* Didn't get an EDID, so
	 * Set wide sync ranges so we get all modes
	 * handed to valid_mode for checking
	 */
	connector->display_info.min_vfreq = 0;
	connector->display_info.max_vfreq = 200;
	connector->display_info.min_hfreq = 0;
	connector->display_info.max_hfreq = 200;

	if (dev_priv->panel_fixed_mode != NULL) {
		struct drm_display_mode *mode;

		mutex_unlock(&dev->mode_config.mutex);
		mode = drm_mode_duplicate(dev, dev_priv->panel_fixed_mode);
		drm_mode_probed_add(connector, mode);
		mutex_unlock(&dev->mode_config.mutex);

		return 1;
	}

	return 0;
}

/**
 * intel_lvds_destroy - unregister and free LVDS structures
 * @connector: connector to free
 *
 * Unregister the DDC bus for this connector then free the driver private
 * structure.
 */
static void intel_lvds_destroy(struct drm_connector *connector)
{
	struct intel_output *intel_output = to_intel_output(connector);

	if (intel_output->ddc_bus)
		intel_i2c_destroy(intel_output->ddc_bus);
	drm_sysfs_connector_remove(connector);
	drm_connector_cleanup(connector);
	kfree(connector);
}

static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
	.dpms = intel_lvds_dpms,
	.mode_fixup = intel_lvds_mode_fixup,
	.prepare = intel_lvds_prepare,
	.mode_set = intel_lvds_mode_set,
	.commit = intel_lvds_commit,
};

static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
	.get_modes = intel_lvds_get_modes,
	.mode_valid = intel_lvds_mode_valid,
	.best_encoder = intel_best_encoder,
};

static const struct drm_connector_funcs intel_lvds_connector_funcs = {
	.save = intel_lvds_save,
	.restore = intel_lvds_restore,
	.detect = intel_lvds_detect,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = intel_lvds_destroy,
};


static void intel_lvds_enc_destroy(struct drm_encoder *encoder)
{
	drm_encoder_cleanup(encoder);
}

static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
	.destroy = intel_lvds_enc_destroy,
};



/**
 * intel_lvds_init - setup LVDS connectors on this device
 * @dev: drm device
 *
 * Create the connector, register the LVDS DDC bus, and try to figure out what
 * modes we can display on the LVDS panel (if present).
 */
void intel_lvds_init(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_output *intel_output;
	struct drm_connector *connector;
	struct drm_encoder *encoder;
	struct drm_display_mode *scan; /* *modes, *bios_mode; */
	struct drm_crtc *crtc;
	u32 lvds;
	int pipe;

	intel_output = kzalloc(sizeof(struct intel_output), GFP_KERNEL);
	if (!intel_output) {
		return;
	}

	connector = &intel_output->base;
	encoder = &intel_output->enc;
	drm_connector_init(dev, &intel_output->base, &intel_lvds_connector_funcs,
			   DRM_MODE_CONNECTOR_LVDS);

	drm_encoder_init(dev, &intel_output->enc, &intel_lvds_enc_funcs,
			 DRM_MODE_ENCODER_LVDS);

	drm_mode_connector_attach_encoder(&intel_output->base, &intel_output->enc);
	intel_output->type = INTEL_OUTPUT_LVDS;

	drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
	drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
	connector->display_info.subpixel_order = SubPixelHorizontalRGB;
	connector->interlace_allowed = false;
	connector->doublescan_allowed = false;


	/*
	 * LVDS discovery:
	 * 1) check for EDID on DDC
	 * 2) check for VBT data
	 * 3) check to see if LVDS is already on
	 *    if none of the above, no panel
	 * 4) make sure lid is open
	 *    if closed, act like it's not there for now
	 */

	/* Set up the DDC bus. */
	intel_output->ddc_bus = intel_i2c_create(dev, GPIOC, "LVDSDDC_C");
	if (!intel_output->ddc_bus) {
		dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
			   "failed.\n");
		goto failed;
	}

	/*
	 * Attempt to get the fixed panel mode from DDC.  Assume that the
	 * preferred mode is the right one.
	 */
	intel_ddc_get_modes(intel_output);

	list_for_each_entry(scan, &connector->probed_modes, head) {
		mutex_lock(&dev->mode_config.mutex);
		if (scan->type & DRM_MODE_TYPE_PREFERRED) {
			dev_priv->panel_fixed_mode =
				drm_mode_duplicate(dev, scan);
			mutex_unlock(&dev->mode_config.mutex);
			goto out; /* FIXME: check for quirks */
		}
		mutex_unlock(&dev->mode_config.mutex);
	}

	/* Failed to get EDID, what about VBT? */
	if (dev_priv->vbt_mode) {
		mutex_lock(&dev->mode_config.mutex);
		dev_priv->panel_fixed_mode =
			drm_mode_duplicate(dev, dev_priv->vbt_mode);
		mutex_unlock(&dev->mode_config.mutex);
		if (dev_priv->panel_fixed_mode) {
			dev_priv->panel_fixed_mode->type |=
				DRM_MODE_TYPE_PREFERRED;
			drm_mode_probed_add(connector,
					    dev_priv->panel_fixed_mode);
			goto out;
		}
	}

	/*
	 * If we didn't get EDID, try checking if the panel is already turned
	 * on.  If so, assume that whatever is currently programmed is the
	 * correct mode.
	 */
	lvds = I915_READ(LVDS);
	pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
	crtc = intel_get_crtc_from_pipe(dev, pipe);

	if (crtc && (lvds & LVDS_PORT_EN)) {
		dev_priv->panel_fixed_mode = intel_crtc_mode_get(dev, crtc);
		if (dev_priv->panel_fixed_mode) {
			dev_priv->panel_fixed_mode->type |=
				DRM_MODE_TYPE_PREFERRED;
			goto out; /* FIXME: check for quirks */
		}
	}

	/* If we still don't have a mode after all that, give up. */
	if (!dev_priv->panel_fixed_mode)
		goto failed;

	/* FIXME: detect aopen & mac mini type stuff automatically? */
	/*
	 * Blacklist machines with BIOSes that list an LVDS panel without
	 * actually having one.
	 */
	if (IS_I945GM(dev)) {
		/* aopen mini pc */
		if (dev->pdev->subsystem_vendor == 0xa0a0)
			goto failed;

		if ((dev->pdev->subsystem_vendor == 0x8086) &&
		    (dev->pdev->subsystem_device == 0x7270)) {
			/* It's a Mac Mini or Macbook Pro.
			 *
			 * Apple hardware is out to get us.  The macbook pro
			 * has a real LVDS panel, but the mac mini does not,
			 * and they have the same device IDs.  We'll
			 * distinguish by panel size, on the assumption
			 * that Apple isn't about to make any machines with an
			 * 800x600 display.
			 */

			if (dev_priv->panel_fixed_mode != NULL &&
			    dev_priv->panel_fixed_mode->hdisplay == 800 &&
			    dev_priv->panel_fixed_mode->vdisplay == 600) {
				DRM_DEBUG("Suspected Mac Mini, ignoring the LVDS\n");
				goto failed;
			}
		}
	}


out:
	drm_sysfs_connector_add(connector);
	return;

failed:
	DRM_DEBUG("No LVDS modes found, disabling.\n");
	if (intel_output->ddc_bus)
		intel_i2c_destroy(intel_output->ddc_bus);
	drm_connector_cleanup(connector);
	kfree(connector);
}
OpenPOWER on IntegriCloud