1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright © 2006-2011 Intel Corporation
4  *
5  * Authors:
6  *	Eric Anholt <eric@anholt.net>
7  *	Dave Airlie <airlied@linux.ie>
8  *	Jesse Barnes <jesse.barnes@intel.com>
9  */
10 
11 #include <linux/dmi.h>
12 #include <linux/i2c.h>
13 #include <linux/pm_runtime.h>
14 
15 #include <drm/drm_simple_kms_helper.h>
16 
17 #include "cdv_device.h"
18 #include "intel_bios.h"
19 #include "power.h"
20 #include "psb_drv.h"
21 #include "psb_intel_drv.h"
22 #include "psb_intel_reg.h"
23 
24 /*
25  * LVDS I2C backlight control macros
26  */
27 #define BRIGHTNESS_MAX_LEVEL 100
28 #define BRIGHTNESS_MASK 0xFF
29 #define BLC_I2C_TYPE	0x01
30 #define BLC_PWM_TYPT	0x02
31 
32 #define BLC_POLARITY_NORMAL 0
33 #define BLC_POLARITY_INVERSE 1
34 
35 #define PSB_BLC_MAX_PWM_REG_FREQ       (0xFFFE)
36 #define PSB_BLC_MIN_PWM_REG_FREQ	(0x2)
37 #define PSB_BLC_PWM_PRECISION_FACTOR	(10)
38 #define PSB_BACKLIGHT_PWM_CTL_SHIFT	(16)
39 #define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE)
40 
41 struct cdv_intel_lvds_priv {
42 	/**
43 	 * Saved LVDO output states
44 	 */
45 	uint32_t savePP_ON;
46 	uint32_t savePP_OFF;
47 	uint32_t saveLVDS;
48 	uint32_t savePP_CONTROL;
49 	uint32_t savePP_CYCLE;
50 	uint32_t savePFIT_CONTROL;
51 	uint32_t savePFIT_PGM_RATIOS;
52 	uint32_t saveBLC_PWM_CTL;
53 };
54 
55 /*
56  * Returns the maximum level of the backlight duty cycle field.
57  */
58 static u32 cdv_intel_lvds_get_max_backlight(struct drm_device *dev)
59 {
60 	struct drm_psb_private *dev_priv = dev->dev_private;
61 	u32 retval;
62 
63 	if (gma_power_begin(dev, false)) {
64 		retval = ((REG_READ(BLC_PWM_CTL) &
65 			  BACKLIGHT_MODULATION_FREQ_MASK) >>
66 			  BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
67 
68 		gma_power_end(dev);
69 	} else
70 		retval = ((dev_priv->regs.saveBLC_PWM_CTL &
71 			  BACKLIGHT_MODULATION_FREQ_MASK) >>
72 			  BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
73 
74 	return retval;
75 }
76 
77 /*
78  * Sets the backlight level.
79  *
80  * level backlight level, from 0 to cdv_intel_lvds_get_max_backlight().
81  */
82 static void cdv_intel_lvds_set_backlight(struct drm_device *dev, int level)
83 {
84 	struct drm_psb_private *dev_priv = dev->dev_private;
85 	u32 blc_pwm_ctl;
86 
87 	if (gma_power_begin(dev, false)) {
88 		blc_pwm_ctl =
89 			REG_READ(BLC_PWM_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
90 		REG_WRITE(BLC_PWM_CTL,
91 				(blc_pwm_ctl |
92 				(level << BACKLIGHT_DUTY_CYCLE_SHIFT)));
93 		gma_power_end(dev);
94 	} else {
95 		blc_pwm_ctl = dev_priv->regs.saveBLC_PWM_CTL &
96 				~BACKLIGHT_DUTY_CYCLE_MASK;
97 		dev_priv->regs.saveBLC_PWM_CTL = (blc_pwm_ctl |
98 					(level << BACKLIGHT_DUTY_CYCLE_SHIFT));
99 	}
100 }
101 
102 /*
103  * Sets the power state for the panel.
104  */
105 static void cdv_intel_lvds_set_power(struct drm_device *dev,
106 				     struct drm_encoder *encoder, bool on)
107 {
108 	struct drm_psb_private *dev_priv = dev->dev_private;
109 	u32 pp_status;
110 
111 	if (!gma_power_begin(dev, true))
112 		return;
113 
114 	if (on) {
115 		REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) |
116 			  POWER_TARGET_ON);
117 		do {
118 			pp_status = REG_READ(PP_STATUS);
119 		} while ((pp_status & PP_ON) == 0);
120 
121 		cdv_intel_lvds_set_backlight(dev,
122 				dev_priv->mode_dev.backlight_duty_cycle);
123 	} else {
124 		cdv_intel_lvds_set_backlight(dev, 0);
125 
126 		REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) &
127 			  ~POWER_TARGET_ON);
128 		do {
129 			pp_status = REG_READ(PP_STATUS);
130 		} while (pp_status & PP_ON);
131 	}
132 	gma_power_end(dev);
133 }
134 
135 static void cdv_intel_lvds_encoder_dpms(struct drm_encoder *encoder, int mode)
136 {
137 	struct drm_device *dev = encoder->dev;
138 	if (mode == DRM_MODE_DPMS_ON)
139 		cdv_intel_lvds_set_power(dev, encoder, true);
140 	else
141 		cdv_intel_lvds_set_power(dev, encoder, false);
142 	/* XXX: We never power down the LVDS pairs. */
143 }
144 
145 static void cdv_intel_lvds_save(struct drm_connector *connector)
146 {
147 }
148 
149 static void cdv_intel_lvds_restore(struct drm_connector *connector)
150 {
151 }
152 
153 static enum drm_mode_status cdv_intel_lvds_mode_valid(struct drm_connector *connector,
154 			      struct drm_display_mode *mode)
155 {
156 	struct drm_device *dev = connector->dev;
157 	struct drm_psb_private *dev_priv = dev->dev_private;
158 	struct drm_display_mode *fixed_mode =
159 					dev_priv->mode_dev.panel_fixed_mode;
160 
161 	/* just in case */
162 	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
163 		return MODE_NO_DBLESCAN;
164 
165 	/* just in case */
166 	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
167 		return MODE_NO_INTERLACE;
168 
169 	if (fixed_mode) {
170 		if (mode->hdisplay > fixed_mode->hdisplay)
171 			return MODE_PANEL;
172 		if (mode->vdisplay > fixed_mode->vdisplay)
173 			return MODE_PANEL;
174 	}
175 	return MODE_OK;
176 }
177 
178 static bool cdv_intel_lvds_mode_fixup(struct drm_encoder *encoder,
179 				  const struct drm_display_mode *mode,
180 				  struct drm_display_mode *adjusted_mode)
181 {
182 	struct drm_device *dev = encoder->dev;
183 	struct drm_psb_private *dev_priv = dev->dev_private;
184 	struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
185 	struct drm_encoder *tmp_encoder;
186 	struct drm_display_mode *panel_fixed_mode = mode_dev->panel_fixed_mode;
187 
188 	/* Should never happen!! */
189 	list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list,
190 			    head) {
191 		if (tmp_encoder != encoder
192 		    && tmp_encoder->crtc == encoder->crtc) {
193 			pr_err("Can't enable LVDS and another encoder on the same pipe\n");
194 			return false;
195 		}
196 	}
197 
198 	/*
199 	 * If we have timings from the BIOS for the panel, put them in
200 	 * to the adjusted mode.  The CRTC will be set up for this mode,
201 	 * with the panel scaling set up to source from the H/VDisplay
202 	 * of the original mode.
203 	 */
204 	if (panel_fixed_mode != NULL) {
205 		adjusted_mode->hdisplay = panel_fixed_mode->hdisplay;
206 		adjusted_mode->hsync_start = panel_fixed_mode->hsync_start;
207 		adjusted_mode->hsync_end = panel_fixed_mode->hsync_end;
208 		adjusted_mode->htotal = panel_fixed_mode->htotal;
209 		adjusted_mode->vdisplay = panel_fixed_mode->vdisplay;
210 		adjusted_mode->vsync_start = panel_fixed_mode->vsync_start;
211 		adjusted_mode->vsync_end = panel_fixed_mode->vsync_end;
212 		adjusted_mode->vtotal = panel_fixed_mode->vtotal;
213 		adjusted_mode->clock = panel_fixed_mode->clock;
214 		drm_mode_set_crtcinfo(adjusted_mode,
215 				      CRTC_INTERLACE_HALVE_V);
216 	}
217 
218 	/*
219 	 * XXX: It would be nice to support lower refresh rates on the
220 	 * panels to reduce power consumption, and perhaps match the
221 	 * user's requested refresh rate.
222 	 */
223 
224 	return true;
225 }
226 
227 static void cdv_intel_lvds_prepare(struct drm_encoder *encoder)
228 {
229 	struct drm_device *dev = encoder->dev;
230 	struct drm_psb_private *dev_priv = dev->dev_private;
231 	struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
232 
233 	if (!gma_power_begin(dev, true))
234 		return;
235 
236 	mode_dev->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL);
237 	mode_dev->backlight_duty_cycle = (mode_dev->saveBLC_PWM_CTL &
238 					  BACKLIGHT_DUTY_CYCLE_MASK);
239 
240 	cdv_intel_lvds_set_power(dev, encoder, false);
241 
242 	gma_power_end(dev);
243 }
244 
245 static void cdv_intel_lvds_commit(struct drm_encoder *encoder)
246 {
247 	struct drm_device *dev = encoder->dev;
248 	struct drm_psb_private *dev_priv = dev->dev_private;
249 	struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
250 
251 	if (mode_dev->backlight_duty_cycle == 0)
252 		mode_dev->backlight_duty_cycle =
253 		    cdv_intel_lvds_get_max_backlight(dev);
254 
255 	cdv_intel_lvds_set_power(dev, encoder, true);
256 }
257 
258 static void cdv_intel_lvds_mode_set(struct drm_encoder *encoder,
259 				struct drm_display_mode *mode,
260 				struct drm_display_mode *adjusted_mode)
261 {
262 	struct drm_device *dev = encoder->dev;
263 	struct drm_psb_private *dev_priv = dev->dev_private;
264 	struct gma_crtc *gma_crtc = to_gma_crtc(encoder->crtc);
265 	u32 pfit_control;
266 
267 	/*
268 	 * The LVDS pin pair will already have been turned on in the
269 	 * cdv_intel_crtc_mode_set since it has a large impact on the DPLL
270 	 * settings.
271 	 */
272 
273 	/*
274 	 * Enable automatic panel scaling so that non-native modes fill the
275 	 * screen.  Should be enabled before the pipe is enabled, according to
276 	 * register description and PRM.
277 	 */
278 	if (mode->hdisplay != adjusted_mode->hdisplay ||
279 	    mode->vdisplay != adjusted_mode->vdisplay)
280 		pfit_control = (PFIT_ENABLE | VERT_AUTO_SCALE |
281 				HORIZ_AUTO_SCALE | VERT_INTERP_BILINEAR |
282 				HORIZ_INTERP_BILINEAR);
283 	else
284 		pfit_control = 0;
285 
286 	pfit_control |= gma_crtc->pipe << PFIT_PIPE_SHIFT;
287 
288 	if (dev_priv->lvds_dither)
289 		pfit_control |= PANEL_8TO6_DITHER_ENABLE;
290 
291 	REG_WRITE(PFIT_CONTROL, pfit_control);
292 }
293 
294 /*
295  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
296  */
297 static int cdv_intel_lvds_get_modes(struct drm_connector *connector)
298 {
299 	struct drm_device *dev = connector->dev;
300 	struct drm_psb_private *dev_priv = dev->dev_private;
301 	struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
302 	struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
303 	int ret;
304 
305 	ret = psb_intel_ddc_get_modes(connector, &gma_encoder->i2c_bus->adapter);
306 
307 	if (ret)
308 		return ret;
309 
310 	if (mode_dev->panel_fixed_mode != NULL) {
311 		struct drm_display_mode *mode =
312 		    drm_mode_duplicate(dev, mode_dev->panel_fixed_mode);
313 		drm_mode_probed_add(connector, mode);
314 		return 1;
315 	}
316 
317 	return 0;
318 }
319 
320 /**
321  * cdv_intel_lvds_destroy - unregister and free LVDS structures
322  * @connector: connector to free
323  *
324  * Unregister the DDC bus for this connector then free the driver private
325  * structure.
326  */
327 static void cdv_intel_lvds_destroy(struct drm_connector *connector)
328 {
329 	struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
330 
331 	psb_intel_i2c_destroy(gma_encoder->i2c_bus);
332 	drm_connector_unregister(connector);
333 	drm_connector_cleanup(connector);
334 	kfree(connector);
335 }
336 
337 static int cdv_intel_lvds_set_property(struct drm_connector *connector,
338 				       struct drm_property *property,
339 				       uint64_t value)
340 {
341 	struct drm_encoder *encoder = connector->encoder;
342 
343 	if (!strcmp(property->name, "scaling mode") && encoder) {
344 		struct gma_crtc *crtc = to_gma_crtc(encoder->crtc);
345 		uint64_t curValue;
346 
347 		if (!crtc)
348 			return -1;
349 
350 		switch (value) {
351 		case DRM_MODE_SCALE_FULLSCREEN:
352 			break;
353 		case DRM_MODE_SCALE_NO_SCALE:
354 			break;
355 		case DRM_MODE_SCALE_ASPECT:
356 			break;
357 		default:
358 			return -1;
359 		}
360 
361 		if (drm_object_property_get_value(&connector->base,
362 						     property,
363 						     &curValue))
364 			return -1;
365 
366 		if (curValue == value)
367 			return 0;
368 
369 		if (drm_object_property_set_value(&connector->base,
370 							property,
371 							value))
372 			return -1;
373 
374 		if (crtc->saved_mode.hdisplay != 0 &&
375 		    crtc->saved_mode.vdisplay != 0) {
376 			if (!drm_crtc_helper_set_mode(encoder->crtc,
377 						      &crtc->saved_mode,
378 						      encoder->crtc->x,
379 						      encoder->crtc->y,
380 						      encoder->crtc->primary->fb))
381 				return -1;
382 		}
383 	} else if (!strcmp(property->name, "backlight") && encoder) {
384 		if (drm_object_property_set_value(&connector->base,
385 							property,
386 							value))
387 			return -1;
388 		else
389                         gma_backlight_set(encoder->dev, value);
390 	} else if (!strcmp(property->name, "DPMS") && encoder) {
391 		const struct drm_encoder_helper_funcs *helpers =
392 					encoder->helper_private;
393 		helpers->dpms(encoder, value);
394 	}
395 	return 0;
396 }
397 
398 static const struct drm_encoder_helper_funcs
399 					cdv_intel_lvds_helper_funcs = {
400 	.dpms = cdv_intel_lvds_encoder_dpms,
401 	.mode_fixup = cdv_intel_lvds_mode_fixup,
402 	.prepare = cdv_intel_lvds_prepare,
403 	.mode_set = cdv_intel_lvds_mode_set,
404 	.commit = cdv_intel_lvds_commit,
405 };
406 
407 static const struct drm_connector_helper_funcs
408 				cdv_intel_lvds_connector_helper_funcs = {
409 	.get_modes = cdv_intel_lvds_get_modes,
410 	.mode_valid = cdv_intel_lvds_mode_valid,
411 	.best_encoder = gma_best_encoder,
412 };
413 
414 static const struct drm_connector_funcs cdv_intel_lvds_connector_funcs = {
415 	.dpms = drm_helper_connector_dpms,
416 	.fill_modes = drm_helper_probe_single_connector_modes,
417 	.set_property = cdv_intel_lvds_set_property,
418 	.destroy = cdv_intel_lvds_destroy,
419 };
420 
421 /*
422  * Enumerate the child dev array parsed from VBT to check whether
423  * the LVDS is present.
424  * If it is present, return 1.
425  * If it is not present, return false.
426  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
427  */
428 static bool lvds_is_present_in_vbt(struct drm_device *dev,
429 				   u8 *i2c_pin)
430 {
431 	struct drm_psb_private *dev_priv = dev->dev_private;
432 	int i;
433 
434 	if (!dev_priv->child_dev_num)
435 		return true;
436 
437 	for (i = 0; i < dev_priv->child_dev_num; i++) {
438 		struct child_device_config *child = dev_priv->child_dev + i;
439 
440 		/* If the device type is not LFP, continue.
441 		 * We have to check both the new identifiers as well as the
442 		 * old for compatibility with some BIOSes.
443 		 */
444 		if (child->device_type != DEVICE_TYPE_INT_LFP &&
445 		    child->device_type != DEVICE_TYPE_LFP)
446 			continue;
447 
448 		if (child->i2c_pin)
449 		    *i2c_pin = child->i2c_pin;
450 
451 		/* However, we cannot trust the BIOS writers to populate
452 		 * the VBT correctly.  Since LVDS requires additional
453 		 * information from AIM blocks, a non-zero addin offset is
454 		 * a good indicator that the LVDS is actually present.
455 		 */
456 		if (child->addin_offset)
457 			return true;
458 
459 		/* But even then some BIOS writers perform some black magic
460 		 * and instantiate the device without reference to any
461 		 * additional data.  Trust that if the VBT was written into
462 		 * the OpRegion then they have validated the LVDS's existence.
463 		 */
464 		if (dev_priv->opregion.vbt)
465 			return true;
466 	}
467 
468 	return false;
469 }
470 
471 /**
472  * cdv_intel_lvds_init - setup LVDS connectors on this device
473  * @dev: drm device
474  * @mode_dev: PSB mode device
475  *
476  * Create the connector, register the LVDS DDC bus, and try to figure out what
477  * modes we can display on the LVDS panel (if present).
478  */
479 void cdv_intel_lvds_init(struct drm_device *dev,
480 		     struct psb_intel_mode_device *mode_dev)
481 {
482 	struct gma_encoder *gma_encoder;
483 	struct gma_connector *gma_connector;
484 	struct cdv_intel_lvds_priv *lvds_priv;
485 	struct drm_connector *connector;
486 	struct drm_encoder *encoder;
487 	struct drm_display_mode *scan;
488 	struct drm_crtc *crtc;
489 	struct drm_psb_private *dev_priv = dev->dev_private;
490 	u32 lvds;
491 	int pipe;
492 	u8 pin;
493 
494 	if (!dev_priv->lvds_enabled_in_vbt)
495 		return;
496 
497 	pin = GMBUS_PORT_PANEL;
498 	if (!lvds_is_present_in_vbt(dev, &pin)) {
499 		DRM_DEBUG_KMS("LVDS is not present in VBT\n");
500 		return;
501 	}
502 
503 	gma_encoder = kzalloc(sizeof(struct gma_encoder),
504 				    GFP_KERNEL);
505 	if (!gma_encoder)
506 		return;
507 
508 	gma_connector = kzalloc(sizeof(struct gma_connector),
509 				      GFP_KERNEL);
510 	if (!gma_connector)
511 		goto failed_connector;
512 
513 	lvds_priv = kzalloc(sizeof(struct cdv_intel_lvds_priv), GFP_KERNEL);
514 	if (!lvds_priv)
515 		goto failed_lvds_priv;
516 
517 	gma_encoder->dev_priv = lvds_priv;
518 
519 	connector = &gma_connector->base;
520 	gma_connector->save = cdv_intel_lvds_save;
521 	gma_connector->restore = cdv_intel_lvds_restore;
522 	encoder = &gma_encoder->base;
523 
524 
525 	drm_connector_init(dev, connector,
526 			   &cdv_intel_lvds_connector_funcs,
527 			   DRM_MODE_CONNECTOR_LVDS);
528 
529 	drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_LVDS);
530 
531 	gma_connector_attach_encoder(gma_connector, gma_encoder);
532 	gma_encoder->type = INTEL_OUTPUT_LVDS;
533 
534 	drm_encoder_helper_add(encoder, &cdv_intel_lvds_helper_funcs);
535 	drm_connector_helper_add(connector,
536 				 &cdv_intel_lvds_connector_helper_funcs);
537 	connector->display_info.subpixel_order = SubPixelHorizontalRGB;
538 	connector->interlace_allowed = false;
539 	connector->doublescan_allowed = false;
540 
541 	/*Attach connector properties*/
542 	drm_object_attach_property(&connector->base,
543 				      dev->mode_config.scaling_mode_property,
544 				      DRM_MODE_SCALE_FULLSCREEN);
545 	drm_object_attach_property(&connector->base,
546 				      dev_priv->backlight_property,
547 				      BRIGHTNESS_MAX_LEVEL);
548 
549 	/**
550 	 * Set up I2C bus
551 	 * FIXME: distroy i2c_bus when exit
552 	 */
553 	gma_encoder->i2c_bus = psb_intel_i2c_create(dev,
554 							 GPIOB,
555 							 "LVDSBLC_B");
556 	if (!gma_encoder->i2c_bus) {
557 		dev_printk(KERN_ERR,
558 			dev->dev, "I2C bus registration failed.\n");
559 		goto failed_blc_i2c;
560 	}
561 	gma_encoder->i2c_bus->slave_addr = 0x2C;
562 	dev_priv->lvds_i2c_bus = gma_encoder->i2c_bus;
563 
564 	/*
565 	 * LVDS discovery:
566 	 * 1) check for EDID on DDC
567 	 * 2) check for VBT data
568 	 * 3) check to see if LVDS is already on
569 	 *    if none of the above, no panel
570 	 * 4) make sure lid is open
571 	 *    if closed, act like it's not there for now
572 	 */
573 
574 	/* Set up the DDC bus. */
575 	gma_encoder->ddc_bus = psb_intel_i2c_create(dev,
576 							 GPIOC,
577 							 "LVDSDDC_C");
578 	if (!gma_encoder->ddc_bus) {
579 		dev_printk(KERN_ERR, dev->dev,
580 			   "DDC bus registration " "failed.\n");
581 		goto failed_ddc;
582 	}
583 
584 	/*
585 	 * Attempt to get the fixed panel mode from DDC.  Assume that the
586 	 * preferred mode is the right one.
587 	 */
588 	mutex_lock(&dev->mode_config.mutex);
589 	psb_intel_ddc_get_modes(connector,
590 				&gma_encoder->ddc_bus->adapter);
591 	list_for_each_entry(scan, &connector->probed_modes, head) {
592 		if (scan->type & DRM_MODE_TYPE_PREFERRED) {
593 			mode_dev->panel_fixed_mode =
594 			    drm_mode_duplicate(dev, scan);
595 			goto out;	/* FIXME: check for quirks */
596 		}
597 	}
598 
599 	/* Failed to get EDID, what about VBT? do we need this?*/
600 	if (dev_priv->lfp_lvds_vbt_mode) {
601 		mode_dev->panel_fixed_mode =
602 			drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
603 		if (mode_dev->panel_fixed_mode) {
604 			mode_dev->panel_fixed_mode->type |=
605 				DRM_MODE_TYPE_PREFERRED;
606 			goto out;	/* FIXME: check for quirks */
607 		}
608 	}
609 	/*
610 	 * If we didn't get EDID, try checking if the panel is already turned
611 	 * on.	If so, assume that whatever is currently programmed is the
612 	 * correct mode.
613 	 */
614 	lvds = REG_READ(LVDS);
615 	pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
616 	crtc = psb_intel_get_crtc_from_pipe(dev, pipe);
617 
618 	if (crtc && (lvds & LVDS_PORT_EN)) {
619 		mode_dev->panel_fixed_mode =
620 		    cdv_intel_crtc_mode_get(dev, crtc);
621 		if (mode_dev->panel_fixed_mode) {
622 			mode_dev->panel_fixed_mode->type |=
623 			    DRM_MODE_TYPE_PREFERRED;
624 			goto out;	/* FIXME: check for quirks */
625 		}
626 	}
627 
628 	/* If we still don't have a mode after all that, give up. */
629 	if (!mode_dev->panel_fixed_mode) {
630 		DRM_DEBUG
631 			("Found no modes on the lvds, ignoring the LVDS\n");
632 		goto failed_find;
633 	}
634 
635 	/* setup PWM */
636 	{
637 		u32 pwm;
638 
639 		pwm = REG_READ(BLC_PWM_CTL2);
640 		if (pipe == 1)
641 			pwm |= PWM_PIPE_B;
642 		else
643 			pwm &= ~PWM_PIPE_B;
644 		pwm |= PWM_ENABLE;
645 		REG_WRITE(BLC_PWM_CTL2, pwm);
646 	}
647 
648 out:
649 	mutex_unlock(&dev->mode_config.mutex);
650 	drm_connector_register(connector);
651 	return;
652 
653 failed_find:
654 	mutex_unlock(&dev->mode_config.mutex);
655 	pr_err("Failed find\n");
656 	psb_intel_i2c_destroy(gma_encoder->ddc_bus);
657 failed_ddc:
658 	pr_err("Failed DDC\n");
659 	psb_intel_i2c_destroy(gma_encoder->i2c_bus);
660 failed_blc_i2c:
661 	pr_err("Failed BLC\n");
662 	drm_encoder_cleanup(encoder);
663 	drm_connector_cleanup(connector);
664 	kfree(lvds_priv);
665 failed_lvds_priv:
666 	kfree(gma_connector);
667 failed_connector:
668 	kfree(gma_encoder);
669 }
670