summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/shmobile/shmob_drm_crtc.c
blob: 03556dbfcafbf2a68ce6d511d029e5c06493d70a (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
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
// SPDX-License-Identifier: GPL-2.0+
/*
 * shmob_drm_crtc.c  --  SH Mobile DRM CRTCs
 *
 * Copyright (C) 2012 Renesas Electronics Corporation
 *
 * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
 */

#include <linux/backlight.h>
#include <linux/clk.h>

#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_simple_kms_helper.h>
#include <drm/drm_vblank.h>

#include "shmob_drm_backlight.h"
#include "shmob_drm_crtc.h"
#include "shmob_drm_drv.h"
#include "shmob_drm_kms.h"
#include "shmob_drm_plane.h"
#include "shmob_drm_regs.h"

/*
 * TODO: panel support
 */

/* -----------------------------------------------------------------------------
 * Clock management
 */

static int shmob_drm_clk_on(struct shmob_drm_device *sdev)
{
	int ret;

	if (sdev->clock) {
		ret = clk_prepare_enable(sdev->clock);
		if (ret < 0)
			return ret;
	}

	return 0;
}

static void shmob_drm_clk_off(struct shmob_drm_device *sdev)
{
	if (sdev->clock)
		clk_disable_unprepare(sdev->clock);
}

/* -----------------------------------------------------------------------------
 * CRTC
 */

static void shmob_drm_crtc_setup_geometry(struct shmob_drm_crtc *scrtc)
{
	struct drm_crtc *crtc = &scrtc->crtc;
	struct shmob_drm_device *sdev = crtc->dev->dev_private;
	const struct shmob_drm_interface_data *idata = &sdev->pdata->iface;
	const struct drm_display_mode *mode = &crtc->mode;
	u32 value;

	value = sdev->ldmt1r
	      | ((mode->flags & DRM_MODE_FLAG_PVSYNC) ? 0 : LDMT1R_VPOL)
	      | ((mode->flags & DRM_MODE_FLAG_PHSYNC) ? 0 : LDMT1R_HPOL)
	      | ((idata->flags & SHMOB_DRM_IFACE_FL_DWPOL) ? LDMT1R_DWPOL : 0)
	      | ((idata->flags & SHMOB_DRM_IFACE_FL_DIPOL) ? LDMT1R_DIPOL : 0)
	      | ((idata->flags & SHMOB_DRM_IFACE_FL_DAPOL) ? LDMT1R_DAPOL : 0)
	      | ((idata->flags & SHMOB_DRM_IFACE_FL_HSCNT) ? LDMT1R_HSCNT : 0)
	      | ((idata->flags & SHMOB_DRM_IFACE_FL_DWCNT) ? LDMT1R_DWCNT : 0);
	lcdc_write(sdev, LDMT1R, value);

	if (idata->interface >= SHMOB_DRM_IFACE_SYS8A &&
	    idata->interface <= SHMOB_DRM_IFACE_SYS24) {
		/* Setup SYS bus. */
		value = (idata->sys.cs_setup << LDMT2R_CSUP_SHIFT)
		      | (idata->sys.vsync_active_high ? LDMT2R_RSV : 0)
		      | (idata->sys.vsync_dir_input ? LDMT2R_VSEL : 0)
		      | (idata->sys.write_setup << LDMT2R_WCSC_SHIFT)
		      | (idata->sys.write_cycle << LDMT2R_WCEC_SHIFT)
		      | (idata->sys.write_strobe << LDMT2R_WCLW_SHIFT);
		lcdc_write(sdev, LDMT2R, value);

		value = (idata->sys.read_latch << LDMT3R_RDLC_SHIFT)
		      | (idata->sys.read_setup << LDMT3R_RCSC_SHIFT)
		      | (idata->sys.read_cycle << LDMT3R_RCEC_SHIFT)
		      | (idata->sys.read_strobe << LDMT3R_RCLW_SHIFT);
		lcdc_write(sdev, LDMT3R, value);
	}

	value = ((mode->hdisplay / 8) << 16)			/* HDCN */
	      | (mode->htotal / 8);				/* HTCN */
	lcdc_write(sdev, LDHCNR, value);

	value = (((mode->hsync_end - mode->hsync_start) / 8) << 16) /* HSYNW */
	      | (mode->hsync_start / 8);			/* HSYNP */
	lcdc_write(sdev, LDHSYNR, value);

	value = ((mode->hdisplay & 7) << 24) | ((mode->htotal & 7) << 16)
	      | (((mode->hsync_end - mode->hsync_start) & 7) << 8)
	      | (mode->hsync_start & 7);
	lcdc_write(sdev, LDHAJR, value);

	value = ((mode->vdisplay) << 16)			/* VDLN */
	      | mode->vtotal;					/* VTLN */
	lcdc_write(sdev, LDVLNR, value);

	value = ((mode->vsync_end - mode->vsync_start) << 16)	/* VSYNW */
	      | mode->vsync_start;				/* VSYNP */
	lcdc_write(sdev, LDVSYNR, value);
}

static void shmob_drm_crtc_start_stop(struct shmob_drm_crtc *scrtc, bool start)
{
	struct shmob_drm_device *sdev = scrtc->crtc.dev->dev_private;
	u32 value;

	value = lcdc_read(sdev, LDCNT2R);
	if (start)
		lcdc_write(sdev, LDCNT2R, value | LDCNT2R_DO);
	else
		lcdc_write(sdev, LDCNT2R, value & ~LDCNT2R_DO);

	/* Wait until power is applied/stopped. */
	while (1) {
		value = lcdc_read(sdev, LDPMR) & LDPMR_LPS;
		if ((start && value) || (!start && !value))
			break;

		cpu_relax();
	}

	if (!start) {
		/* Stop the dot clock. */
		lcdc_write(sdev, LDDCKSTPR, LDDCKSTPR_DCKSTP);
	}
}

/*
 * shmob_drm_crtc_start - Configure and start the LCDC
 * @scrtc: the SH Mobile CRTC
 *
 * Configure and start the LCDC device. External devices (clocks, MERAM, panels,
 * ...) are not touched by this function.
 */
static void shmob_drm_crtc_start(struct shmob_drm_crtc *scrtc)
{
	struct drm_crtc *crtc = &scrtc->crtc;
	struct shmob_drm_device *sdev = crtc->dev->dev_private;
	const struct shmob_drm_interface_data *idata = &sdev->pdata->iface;
	const struct shmob_drm_format_info *format;
	struct drm_device *dev = sdev->ddev;
	struct drm_plane *plane;
	u32 value;
	int ret;

	if (scrtc->started)
		return;

	format = shmob_drm_format_info(crtc->primary->fb->format->format);
	if (WARN_ON(format == NULL))
		return;

	/* Enable clocks before accessing the hardware. */
	ret = shmob_drm_clk_on(sdev);
	if (ret < 0)
		return;

	/* Reset and enable the LCDC. */
	lcdc_write(sdev, LDCNT2R, lcdc_read(sdev, LDCNT2R) | LDCNT2R_BR);
	lcdc_wait_bit(sdev, LDCNT2R, LDCNT2R_BR, 0);
	lcdc_write(sdev, LDCNT2R, LDCNT2R_ME);

	/* Stop the LCDC first and disable all interrupts. */
	shmob_drm_crtc_start_stop(scrtc, false);
	lcdc_write(sdev, LDINTR, 0);

	/* Configure power supply, dot clocks and start them. */
	lcdc_write(sdev, LDPMR, 0);

	value = sdev->lddckr;
	if (idata->clk_div) {
		/* FIXME: sh7724 can only use 42, 48, 54 and 60 for the divider
		 * denominator.
		 */
		lcdc_write(sdev, LDDCKPAT1R, 0);
		lcdc_write(sdev, LDDCKPAT2R, (1 << (idata->clk_div / 2)) - 1);

		if (idata->clk_div == 1)
			value |= LDDCKR_MOSEL;
		else
			value |= idata->clk_div;
	}

	lcdc_write(sdev, LDDCKR, value);
	lcdc_write(sdev, LDDCKSTPR, 0);
	lcdc_wait_bit(sdev, LDDCKSTPR, ~0, 0);

	/* TODO: Setup SYS panel */

	/* Setup geometry, format, frame buffer memory and operation mode. */
	shmob_drm_crtc_setup_geometry(scrtc);

	/* TODO: Handle YUV colorspaces. Hardcode REC709 for now. */
	lcdc_write(sdev, LDDFR, format->lddfr | LDDFR_CF1);
	lcdc_write(sdev, LDMLSR, scrtc->line_size);
	lcdc_write(sdev, LDSA1R, scrtc->dma[0]);
	if (format->yuv)
		lcdc_write(sdev, LDSA2R, scrtc->dma[1]);
	lcdc_write(sdev, LDSM1R, 0);

	/* Word and long word swap. */
	switch (format->fourcc) {
	case DRM_FORMAT_RGB565:
	case DRM_FORMAT_NV21:
	case DRM_FORMAT_NV61:
	case DRM_FORMAT_NV42:
		value = LDDDSR_LS | LDDDSR_WS;
		break;
	case DRM_FORMAT_RGB888:
	case DRM_FORMAT_NV12:
	case DRM_FORMAT_NV16:
	case DRM_FORMAT_NV24:
		value = LDDDSR_LS | LDDDSR_WS | LDDDSR_BS;
		break;
	case DRM_FORMAT_ARGB8888:
	default:
		value = LDDDSR_LS;
		break;
	}
	lcdc_write(sdev, LDDDSR, value);

	/* Setup planes. */
	drm_for_each_legacy_plane(plane, dev) {
		if (plane->crtc == crtc)
			shmob_drm_plane_setup(plane);
	}

	/* Enable the display output. */
	lcdc_write(sdev, LDCNT1R, LDCNT1R_DE);

	shmob_drm_crtc_start_stop(scrtc, true);

	scrtc->started = true;
}

static void shmob_drm_crtc_stop(struct shmob_drm_crtc *scrtc)
{
	struct drm_crtc *crtc = &scrtc->crtc;
	struct shmob_drm_device *sdev = crtc->dev->dev_private;

	if (!scrtc->started)
		return;

	/* Stop the LCDC. */
	shmob_drm_crtc_start_stop(scrtc, false);

	/* Disable the display output. */
	lcdc_write(sdev, LDCNT1R, 0);

	/* Stop clocks. */
	shmob_drm_clk_off(sdev);

	scrtc->started = false;
}

void shmob_drm_crtc_suspend(struct shmob_drm_crtc *scrtc)
{
	shmob_drm_crtc_stop(scrtc);
}

void shmob_drm_crtc_resume(struct shmob_drm_crtc *scrtc)
{
	if (scrtc->dpms != DRM_MODE_DPMS_ON)
		return;

	shmob_drm_crtc_start(scrtc);
}

static void shmob_drm_crtc_compute_base(struct shmob_drm_crtc *scrtc,
					int x, int y)
{
	struct drm_crtc *crtc = &scrtc->crtc;
	struct drm_framebuffer *fb = crtc->primary->fb;
	struct drm_gem_cma_object *gem;
	unsigned int bpp;

	bpp = scrtc->format->yuv ? 8 : scrtc->format->bpp;
	gem = drm_fb_cma_get_gem_obj(fb, 0);
	scrtc->dma[0] = gem->paddr + fb->offsets[0]
		      + y * fb->pitches[0] + x * bpp / 8;

	if (scrtc->format->yuv) {
		bpp = scrtc->format->bpp - 8;
		gem = drm_fb_cma_get_gem_obj(fb, 1);
		scrtc->dma[1] = gem->paddr + fb->offsets[1]
			      + y / (bpp == 4 ? 2 : 1) * fb->pitches[1]
			      + x * (bpp == 16 ? 2 : 1);
	}
}

static void shmob_drm_crtc_update_base(struct shmob_drm_crtc *scrtc)
{
	struct drm_crtc *crtc = &scrtc->crtc;
	struct shmob_drm_device *sdev = crtc->dev->dev_private;

	shmob_drm_crtc_compute_base(scrtc, crtc->x, crtc->y);

	lcdc_write_mirror(sdev, LDSA1R, scrtc->dma[0]);
	if (scrtc->format->yuv)
		lcdc_write_mirror(sdev, LDSA2R, scrtc->dma[1]);

	lcdc_write(sdev, LDRCNTR, lcdc_read(sdev, LDRCNTR) ^ LDRCNTR_MRS);
}

#define to_shmob_crtc(c)	container_of(c, struct shmob_drm_crtc, crtc)

static void shmob_drm_crtc_dpms(struct drm_crtc *crtc, int mode)
{
	struct shmob_drm_crtc *scrtc = to_shmob_crtc(crtc);

	if (scrtc->dpms == mode)
		return;

	if (mode == DRM_MODE_DPMS_ON)
		shmob_drm_crtc_start(scrtc);
	else
		shmob_drm_crtc_stop(scrtc);

	scrtc->dpms = mode;
}

static void shmob_drm_crtc_mode_prepare(struct drm_crtc *crtc)
{
	shmob_drm_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
}

static int shmob_drm_crtc_mode_set(struct drm_crtc *crtc,
				   struct drm_display_mode *mode,
				   struct drm_display_mode *adjusted_mode,
				   int x, int y,
				   struct drm_framebuffer *old_fb)
{
	struct shmob_drm_crtc *scrtc = to_shmob_crtc(crtc);
	struct shmob_drm_device *sdev = crtc->dev->dev_private;
	const struct shmob_drm_format_info *format;

	format = shmob_drm_format_info(crtc->primary->fb->format->format);
	if (format == NULL) {
		dev_dbg(sdev->dev, "mode_set: unsupported format %08x\n",
			crtc->primary->fb->format->format);
		return -EINVAL;
	}

	scrtc->format = format;
	scrtc->line_size = crtc->primary->fb->pitches[0];

	shmob_drm_crtc_compute_base(scrtc, x, y);

	return 0;
}

static void shmob_drm_crtc_mode_commit(struct drm_crtc *crtc)
{
	shmob_drm_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
}

static int shmob_drm_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
					struct drm_framebuffer *old_fb)
{
	shmob_drm_crtc_update_base(to_shmob_crtc(crtc));

	return 0;
}

static const struct drm_crtc_helper_funcs crtc_helper_funcs = {
	.dpms = shmob_drm_crtc_dpms,
	.prepare = shmob_drm_crtc_mode_prepare,
	.commit = shmob_drm_crtc_mode_commit,
	.mode_set = shmob_drm_crtc_mode_set,
	.mode_set_base = shmob_drm_crtc_mode_set_base,
};

void shmob_drm_crtc_finish_page_flip(struct shmob_drm_crtc *scrtc)
{
	struct drm_pending_vblank_event *event;
	struct drm_device *dev = scrtc->crtc.dev;
	unsigned long flags;

	spin_lock_irqsave(&dev->event_lock, flags);
	event = scrtc->event;
	scrtc->event = NULL;
	if (event) {
		drm_crtc_send_vblank_event(&scrtc->crtc, event);
		drm_crtc_vblank_put(&scrtc->crtc);
	}
	spin_unlock_irqrestore(&dev->event_lock, flags);
}

static int shmob_drm_crtc_page_flip(struct drm_crtc *crtc,
				    struct drm_framebuffer *fb,
				    struct drm_pending_vblank_event *event,
				    uint32_t page_flip_flags,
				    struct drm_modeset_acquire_ctx *ctx)
{
	struct shmob_drm_crtc *scrtc = to_shmob_crtc(crtc);
	struct drm_device *dev = scrtc->crtc.dev;
	unsigned long flags;

	spin_lock_irqsave(&dev->event_lock, flags);
	if (scrtc->event != NULL) {
		spin_unlock_irqrestore(&dev->event_lock, flags);
		return -EBUSY;
	}
	spin_unlock_irqrestore(&dev->event_lock, flags);

	crtc->primary->fb = fb;
	shmob_drm_crtc_update_base(scrtc);

	if (event) {
		event->pipe = 0;
		drm_crtc_vblank_get(&scrtc->crtc);
		spin_lock_irqsave(&dev->event_lock, flags);
		scrtc->event = event;
		spin_unlock_irqrestore(&dev->event_lock, flags);
	}

	return 0;
}

static void shmob_drm_crtc_enable_vblank(struct shmob_drm_device *sdev,
					 bool enable)
{
	unsigned long flags;
	u32 ldintr;

	/* Be careful not to acknowledge any pending interrupt. */
	spin_lock_irqsave(&sdev->irq_lock, flags);
	ldintr = lcdc_read(sdev, LDINTR) | LDINTR_STATUS_MASK;
	if (enable)
		ldintr |= LDINTR_VEE;
	else
		ldintr &= ~LDINTR_VEE;
	lcdc_write(sdev, LDINTR, ldintr);
	spin_unlock_irqrestore(&sdev->irq_lock, flags);
}

static int shmob_drm_enable_vblank(struct drm_crtc *crtc)
{
	struct shmob_drm_device *sdev = crtc->dev->dev_private;

	shmob_drm_crtc_enable_vblank(sdev, true);

	return 0;
}

static void shmob_drm_disable_vblank(struct drm_crtc *crtc)
{
	struct shmob_drm_device *sdev = crtc->dev->dev_private;

	shmob_drm_crtc_enable_vblank(sdev, false);
}

static const struct drm_crtc_funcs crtc_funcs = {
	.destroy = drm_crtc_cleanup,
	.set_config = drm_crtc_helper_set_config,
	.page_flip = shmob_drm_crtc_page_flip,
	.enable_vblank = shmob_drm_enable_vblank,
	.disable_vblank = shmob_drm_disable_vblank,
};

int shmob_drm_crtc_create(struct shmob_drm_device *sdev)
{
	struct drm_crtc *crtc = &sdev->crtc.crtc;
	int ret;

	sdev->crtc.dpms = DRM_MODE_DPMS_OFF;

	ret = drm_crtc_init(sdev->ddev, crtc, &crtc_funcs);
	if (ret < 0)
		return ret;

	drm_crtc_helper_add(crtc, &crtc_helper_funcs);

	return 0;
}

/* -----------------------------------------------------------------------------
 * Encoder
 */

#define to_shmob_encoder(e) \
	container_of(e, struct shmob_drm_encoder, encoder)

static void shmob_drm_encoder_dpms(struct drm_encoder *encoder, int mode)
{
	struct shmob_drm_encoder *senc = to_shmob_encoder(encoder);
	struct shmob_drm_device *sdev = encoder->dev->dev_private;
	struct shmob_drm_connector *scon = &sdev->connector;

	if (senc->dpms == mode)
		return;

	shmob_drm_backlight_dpms(scon, mode);

	senc->dpms = mode;
}

static bool shmob_drm_encoder_mode_fixup(struct drm_encoder *encoder,
					 const struct drm_display_mode *mode,
					 struct drm_display_mode *adjusted_mode)
{
	struct drm_device *dev = encoder->dev;
	struct shmob_drm_device *sdev = dev->dev_private;
	struct drm_connector *connector = &sdev->connector.connector;
	const struct drm_display_mode *panel_mode;

	if (list_empty(&connector->modes)) {
		dev_dbg(dev->dev, "mode_fixup: empty modes list\n");
		return false;
	}

	/* The flat panel mode is fixed, just copy it to the adjusted mode. */
	panel_mode = list_first_entry(&connector->modes,
				      struct drm_display_mode, head);
	drm_mode_copy(adjusted_mode, panel_mode);

	return true;
}

static void shmob_drm_encoder_mode_prepare(struct drm_encoder *encoder)
{
	/* No-op, everything is handled in the CRTC code. */
}

static void shmob_drm_encoder_mode_set(struct drm_encoder *encoder,
				       struct drm_display_mode *mode,
				       struct drm_display_mode *adjusted_mode)
{
	/* No-op, everything is handled in the CRTC code. */
}

static void shmob_drm_encoder_mode_commit(struct drm_encoder *encoder)
{
	/* No-op, everything is handled in the CRTC code. */
}

static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
	.dpms = shmob_drm_encoder_dpms,
	.mode_fixup = shmob_drm_encoder_mode_fixup,
	.prepare = shmob_drm_encoder_mode_prepare,
	.commit = shmob_drm_encoder_mode_commit,
	.mode_set = shmob_drm_encoder_mode_set,
};

int shmob_drm_encoder_create(struct shmob_drm_device *sdev)
{
	struct drm_encoder *encoder = &sdev->encoder.encoder;
	int ret;

	sdev->encoder.dpms = DRM_MODE_DPMS_OFF;

	encoder->possible_crtcs = 1;

	ret = drm_simple_encoder_init(sdev->ddev, encoder,
				      DRM_MODE_ENCODER_LVDS);
	if (ret < 0)
		return ret;

	drm_encoder_helper_add(encoder, &encoder_helper_funcs);

	return 0;
}

/* -----------------------------------------------------------------------------
 * Connector
 */

#define to_shmob_connector(c) \
	container_of(c, struct shmob_drm_connector, connector)

static int shmob_drm_connector_get_modes(struct drm_connector *connector)
{
	struct shmob_drm_device *sdev = connector->dev->dev_private;
	struct drm_display_mode *mode;

	mode = drm_mode_create(connector->dev);
	if (mode == NULL)
		return 0;

	mode->type = DRM_MODE_TYPE_PREFERRED | DRM_MODE_TYPE_DRIVER;
	mode->clock = sdev->pdata->panel.mode.clock;
	mode->hdisplay = sdev->pdata->panel.mode.hdisplay;
	mode->hsync_start = sdev->pdata->panel.mode.hsync_start;
	mode->hsync_end = sdev->pdata->panel.mode.hsync_end;
	mode->htotal = sdev->pdata->panel.mode.htotal;
	mode->vdisplay = sdev->pdata->panel.mode.vdisplay;
	mode->vsync_start = sdev->pdata->panel.mode.vsync_start;
	mode->vsync_end = sdev->pdata->panel.mode.vsync_end;
	mode->vtotal = sdev->pdata->panel.mode.vtotal;
	mode->flags = sdev->pdata->panel.mode.flags;

	drm_mode_set_name(mode);
	drm_mode_probed_add(connector, mode);

	connector->display_info.width_mm = sdev->pdata->panel.width_mm;
	connector->display_info.height_mm = sdev->pdata->panel.height_mm;

	return 1;
}

static struct drm_encoder *
shmob_drm_connector_best_encoder(struct drm_connector *connector)
{
	struct shmob_drm_connector *scon = to_shmob_connector(connector);

	return scon->encoder;
}

static const struct drm_connector_helper_funcs connector_helper_funcs = {
	.get_modes = shmob_drm_connector_get_modes,
	.best_encoder = shmob_drm_connector_best_encoder,
};

static void shmob_drm_connector_destroy(struct drm_connector *connector)
{
	struct shmob_drm_connector *scon = to_shmob_connector(connector);

	shmob_drm_backlight_exit(scon);
	drm_connector_unregister(connector);
	drm_connector_cleanup(connector);
}

static const struct drm_connector_funcs connector_funcs = {
	.dpms = drm_helper_connector_dpms,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = shmob_drm_connector_destroy,
};

int shmob_drm_connector_create(struct shmob_drm_device *sdev,
			       struct drm_encoder *encoder)
{
	struct drm_connector *connector = &sdev->connector.connector;
	int ret;

	sdev->connector.encoder = encoder;

	connector->display_info.width_mm = sdev->pdata->panel.width_mm;
	connector->display_info.height_mm = sdev->pdata->panel.height_mm;

	ret = drm_connector_init(sdev->ddev, connector, &connector_funcs,
				 DRM_MODE_CONNECTOR_LVDS);
	if (ret < 0)
		return ret;

	drm_connector_helper_add(connector, &connector_helper_funcs);

	ret = shmob_drm_backlight_init(&sdev->connector);
	if (ret < 0)
		goto err_cleanup;

	ret = drm_connector_attach_encoder(connector, encoder);
	if (ret < 0)
		goto err_backlight;

	drm_helper_connector_dpms(connector, DRM_MODE_DPMS_OFF);
	drm_object_property_set_value(&connector->base,
		sdev->ddev->mode_config.dpms_property, DRM_MODE_DPMS_OFF);

	return 0;

err_backlight:
	shmob_drm_backlight_exit(&sdev->connector);
err_cleanup:
	drm_connector_cleanup(connector);
	return ret;
}