summaryrefslogtreecommitdiffstats
path: root/drivers/video/via/dvi.c
blob: 84e21b39dd0bd8137f592241e9122538d6e7cbbe (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
/*
 * Copyright 1998-2008 VIA Technologies, Inc. All Rights Reserved.
 * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.

 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation;
 * either version 2, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; without even
 * the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE.See the GNU General Public License
 * for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
#include <linux/via-core.h>
#include <linux/via_i2c.h>
#include "global.h"

static void tmds_register_write(int index, u8 data);
static int tmds_register_read(int index);
static int tmds_register_read_bytes(int index, u8 *buff, int buff_len);
static void __devinit dvi_get_panel_size_from_DDCv1(
	struct tmds_chip_information *tmds_chip,
	struct tmds_setting_information *tmds_setting);
static void __devinit dvi_get_panel_size_from_DDCv2(
	struct tmds_chip_information *tmds_chip,
	struct tmds_setting_information *tmds_setting);
static int viafb_dvi_query_EDID(void);

static int check_tmds_chip(int device_id_subaddr, int device_id)
{
	if (tmds_register_read(device_id_subaddr) == device_id)
		return OK;
	else
		return FAIL;
}

void __devinit viafb_init_dvi_size(struct tmds_chip_information *tmds_chip,
	struct tmds_setting_information *tmds_setting)
{
	DEBUG_MSG(KERN_INFO "viafb_init_dvi_size()\n");

	viafb_dvi_sense();
	switch (viafb_dvi_query_EDID()) {
	case 1:
		dvi_get_panel_size_from_DDCv1(tmds_chip, tmds_setting);
		break;
	case 2:
		dvi_get_panel_size_from_DDCv2(tmds_chip, tmds_setting);
		break;
	default:
		printk(KERN_WARNING "viafb_init_dvi_size: DVI panel size undetected!\n");
		break;
	}

	return;
}

int __devinit viafb_tmds_trasmitter_identify(void)
{
	unsigned char sr2a = 0, sr1e = 0, sr3e = 0;

	/* Turn on ouputting pad */
	switch (viaparinfo->chip_info->gfx_chip_name) {
	case UNICHROME_K8M890:
	    /*=* DFP Low Pad on *=*/
		sr2a = viafb_read_reg(VIASR, SR2A);
		viafb_write_reg_mask(SR2A, VIASR, 0x03, BIT0 + BIT1);
		break;

	case UNICHROME_P4M900:
	case UNICHROME_P4M890:
		/* DFP Low Pad on */
		sr2a = viafb_read_reg(VIASR, SR2A);
		viafb_write_reg_mask(SR2A, VIASR, 0x03, BIT0 + BIT1);
		/* DVP0 Pad on */
		sr1e = viafb_read_reg(VIASR, SR1E);
		viafb_write_reg_mask(SR1E, VIASR, 0xC0, BIT6 + BIT7);
		break;

	default:
	    /* DVP0/DVP1 Pad on */
		sr1e = viafb_read_reg(VIASR, SR1E);
		viafb_write_reg_mask(SR1E, VIASR, 0xF0, BIT4 +
			BIT5 + BIT6 + BIT7);
	    /* SR3E[1]Multi-function selection:
	    0 = Emulate I2C and DDC bus by GPIO2/3/4. */
		sr3e = viafb_read_reg(VIASR, SR3E);
		viafb_write_reg_mask(SR3E, VIASR, 0x0, BIT5);
		break;
	}

	/* Check for VT1632: */
	viaparinfo->chip_info->tmds_chip_info.tmds_chip_name = VT1632_TMDS;
	viaparinfo->chip_info->
		tmds_chip_info.tmds_chip_slave_addr = VT1632_TMDS_I2C_ADDR;
	viaparinfo->chip_info->tmds_chip_info.i2c_port = VIA_PORT_31;
	if (check_tmds_chip(VT1632_DEVICE_ID_REG, VT1632_DEVICE_ID) != FAIL) {
		/*
		 * Currently only support 12bits,dual edge,add 24bits mode later
		 */
		tmds_register_write(0x08, 0x3b);

		DEBUG_MSG(KERN_INFO "\n VT1632 TMDS ! \n");
		DEBUG_MSG(KERN_INFO "\n %2d",
			  viaparinfo->chip_info->tmds_chip_info.tmds_chip_name);
		DEBUG_MSG(KERN_INFO "\n %2d",
			  viaparinfo->chip_info->tmds_chip_info.i2c_port);
		return OK;
	} else {
		viaparinfo->chip_info->tmds_chip_info.i2c_port = VIA_PORT_2C;
		if (check_tmds_chip(VT1632_DEVICE_ID_REG, VT1632_DEVICE_ID)
		    != FAIL) {
			tmds_register_write(0x08, 0x3b);
			DEBUG_MSG(KERN_INFO "\n VT1632 TMDS ! \n");
			DEBUG_MSG(KERN_INFO "\n %2d",
				  viaparinfo->chip_info->
				  tmds_chip_info.tmds_chip_name);
			DEBUG_MSG(KERN_INFO "\n %2d",
				  viaparinfo->chip_info->
				  tmds_chip_info.i2c_port);
			return OK;
		}
	}

	viaparinfo->chip_info->tmds_chip_info.tmds_chip_name = INTEGRATED_TMDS;

	if ((viaparinfo->chip_info->gfx_chip_name == UNICHROME_CX700) &&
	    ((viafb_display_hardware_layout == HW_LAYOUT_DVI_ONLY) ||
	     (viafb_display_hardware_layout == HW_LAYOUT_LCD_DVI))) {
		DEBUG_MSG(KERN_INFO "\n Integrated TMDS ! \n");
		return OK;
	}

	switch (viaparinfo->chip_info->gfx_chip_name) {
	case UNICHROME_K8M890:
		viafb_write_reg(SR2A, VIASR, sr2a);
		break;

	case UNICHROME_P4M900:
	case UNICHROME_P4M890:
		viafb_write_reg(SR2A, VIASR, sr2a);
		viafb_write_reg(SR1E, VIASR, sr1e);
		break;

	default:
		viafb_write_reg(SR1E, VIASR, sr1e);
		viafb_write_reg(SR3E, VIASR, sr3e);
		break;
	}

	viaparinfo->chip_info->
		tmds_chip_info.tmds_chip_name = NON_TMDS_TRANSMITTER;
	viaparinfo->chip_info->tmds_chip_info.
		tmds_chip_slave_addr = VT1632_TMDS_I2C_ADDR;
	return FAIL;
}

static void tmds_register_write(int index, u8 data)
{
	viafb_i2c_writebyte(viaparinfo->chip_info->tmds_chip_info.i2c_port,
			    viaparinfo->chip_info->tmds_chip_info.tmds_chip_slave_addr,
			    index, data);
}

static int tmds_register_read(int index)
{
	u8 data;

	viafb_i2c_readbyte(viaparinfo->chip_info->tmds_chip_info.i2c_port,
			   (u8) viaparinfo->chip_info->tmds_chip_info.tmds_chip_slave_addr,
			   (u8) index, &data);
	return data;
}

static int tmds_register_read_bytes(int index, u8 *buff, int buff_len)
{
	viafb_i2c_readbytes(viaparinfo->chip_info->tmds_chip_info.i2c_port,
			    (u8) viaparinfo->chip_info->tmds_chip_info.tmds_chip_slave_addr,
			    (u8) index, buff, buff_len);
	return 0;
}

/* DVI Set Mode */
void viafb_dvi_set_mode(struct VideoModeTable *mode, int mode_bpp,
	int set_iga)
{
	struct VideoModeTable *rb_mode;
	struct crt_mode_table *pDviTiming;
	unsigned long desirePixelClock, maxPixelClock;
	pDviTiming = mode->crtc;
	desirePixelClock = pDviTiming->clk / 1000000;
	maxPixelClock = (unsigned long)viaparinfo->
		tmds_setting_info->max_pixel_clock;

	DEBUG_MSG(KERN_INFO "\nDVI_set_mode!!\n");

	if ((maxPixelClock != 0) && (desirePixelClock > maxPixelClock)) {
		rb_mode = viafb_get_rb_mode(mode->crtc[0].crtc.hor_addr,
			mode->crtc[0].crtc.ver_addr);
		if (rb_mode) {
			mode = rb_mode;
			pDviTiming = rb_mode->crtc;
		}
	}
	viafb_fill_crtc_timing(pDviTiming, mode, mode_bpp / 8, set_iga);
}

/* Sense DVI Connector */
int viafb_dvi_sense(void)
{
	u8 RegSR1E = 0, RegSR3E = 0, RegCR6B = 0, RegCR91 = 0,
		RegCR93 = 0, RegCR9B = 0, data;
	int ret = false;

	DEBUG_MSG(KERN_INFO "viafb_dvi_sense!!\n");

	if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CLE266) {
		/* DI1 Pad on */
		RegSR1E = viafb_read_reg(VIASR, SR1E);
		viafb_write_reg(SR1E, VIASR, RegSR1E | 0x30);

		/* CR6B[0]VCK Input Selection: 1 = External clock. */
		RegCR6B = viafb_read_reg(VIACR, CR6B);
		viafb_write_reg(CR6B, VIACR, RegCR6B | 0x08);

		/* CR91[4] VDD On [3] Data On [2] VEE On [1] Back Light Off
		   [0] Software Control Power Sequence */
		RegCR91 = viafb_read_reg(VIACR, CR91);
		viafb_write_reg(CR91, VIACR, 0x1D);

		/* CR93[7] DI1 Data Source Selection: 1 = DSP2.
		   CR93[5] DI1 Clock Source: 1 = internal.
		   CR93[4] DI1 Clock Polarity.
		   CR93[3:1] DI1 Clock Adjust. CR93[0] DI1 enable */
		RegCR93 = viafb_read_reg(VIACR, CR93);
		viafb_write_reg(CR93, VIACR, 0x01);
	} else {
		/* DVP0/DVP1 Pad on */
		RegSR1E = viafb_read_reg(VIASR, SR1E);
		viafb_write_reg(SR1E, VIASR, RegSR1E | 0xF0);

		/* SR3E[1]Multi-function selection:
		   0 = Emulate I2C and DDC bus by GPIO2/3/4. */
		RegSR3E = viafb_read_reg(VIASR, SR3E);
		viafb_write_reg(SR3E, VIASR, RegSR3E & (~0x20));

		/* CR91[4] VDD On [3] Data On [2] VEE On [1] Back Light Off
		   [0] Software Control Power Sequence */
		RegCR91 = viafb_read_reg(VIACR, CR91);
		viafb_write_reg(CR91, VIACR, 0x1D);

		/*CR9B[4] DVP1 Data Source Selection: 1 = From secondary
		display.CR9B[2:0] DVP1 Clock Adjust */
		RegCR9B = viafb_read_reg(VIACR, CR9B);
		viafb_write_reg(CR9B, VIACR, 0x01);
	}

	data = (u8) tmds_register_read(0x09);
	if (data & 0x04)
		ret = true;

	if (ret == false) {
		if (viafb_dvi_query_EDID())
			ret = true;
	}

	/* Restore status */
	viafb_write_reg(SR1E, VIASR, RegSR1E);
	viafb_write_reg(CR91, VIACR, RegCR91);
	if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CLE266) {
		viafb_write_reg(CR6B, VIACR, RegCR6B);
		viafb_write_reg(CR93, VIACR, RegCR93);
	} else {
		viafb_write_reg(SR3E, VIASR, RegSR3E);
		viafb_write_reg(CR9B, VIACR, RegCR9B);
	}

	return ret;
}

/* Query Flat Panel's EDID Table Version Through DVI Connector */
static int viafb_dvi_query_EDID(void)
{
	u8 data0, data1;
	int restore;

	DEBUG_MSG(KERN_INFO "viafb_dvi_query_EDID!!\n");

	restore = viaparinfo->chip_info->tmds_chip_info.tmds_chip_slave_addr;
	viaparinfo->chip_info->tmds_chip_info.tmds_chip_slave_addr = 0xA0;

	data0 = (u8) tmds_register_read(0x00);
	data1 = (u8) tmds_register_read(0x01);
	if ((data0 == 0) && (data1 == 0xFF)) {
		viaparinfo->chip_info->
			tmds_chip_info.tmds_chip_slave_addr = restore;
		return EDID_VERSION_1;	/* Found EDID1 Table */
	}

	data0 = (u8) tmds_register_read(0x00);
	viaparinfo->chip_info->tmds_chip_info.tmds_chip_slave_addr = restore;
	if (data0 == 0x20)
		return EDID_VERSION_2;	/* Found EDID2 Table */
	else
		return false;
}

/* Get Panel Size Using EDID1 Table */
static void __devinit dvi_get_panel_size_from_DDCv1(
	struct tmds_chip_information *tmds_chip,
	struct tmds_setting_information *tmds_setting)
{
	int i, max_h = 0, tmp, restore;
	unsigned char rData;
	unsigned char EDID_DATA[18];

	DEBUG_MSG(KERN_INFO "\n dvi_get_panel_size_from_DDCv1 \n");

	restore = tmds_chip->tmds_chip_slave_addr;
	tmds_chip->tmds_chip_slave_addr = 0xA0;

	rData = tmds_register_read(0x23);
	if (rData & 0x3C)
		max_h = 640;
	if (rData & 0xC0)
		max_h = 720;
	if (rData & 0x03)
		max_h = 800;

	rData = tmds_register_read(0x24);
	if (rData & 0xC0)
		max_h = 800;
	if (rData & 0x1E)
		max_h = 1024;
	if (rData & 0x01)
		max_h = 1280;

	for (i = 0x25; i < 0x6D; i++) {
		switch (i) {
		case 0x26:
		case 0x28:
		case 0x2A:
		case 0x2C:
		case 0x2E:
		case 0x30:
		case 0x32:
		case 0x34:
			rData = tmds_register_read(i);
			if (rData == 1)
				break;
			/* data = (data + 31) * 8 */
			tmp = (rData + 31) << 3;
			if (tmp > max_h)
				max_h = tmp;
			break;

		case 0x36:
		case 0x48:
		case 0x5A:
		case 0x6C:
			tmds_register_read_bytes(i, EDID_DATA, 10);
			if (!(EDID_DATA[0] || EDID_DATA[1])) {
				/* The first two byte must be zero. */
				if (EDID_DATA[3] == 0xFD) {
					/* To get max pixel clock. */
					tmds_setting->max_pixel_clock =
						EDID_DATA[9] * 10;
				}
			}
			break;

		default:
			break;
		}
	}

	tmds_setting->max_hres = max_h;
	switch (max_h) {
	case 640:
		tmds_setting->max_vres = 480;
		break;
	case 800:
		tmds_setting->max_vres = 600;
		break;
	case 1024:
		tmds_setting->max_vres = 768;
		break;
	case 1280:
		tmds_setting->max_vres = 1024;
		break;
	case 1400:
		tmds_setting->max_vres = 1050;
		break;
	case 1440:
		tmds_setting->max_vres = 1050;
		break;
	case 1600:
		tmds_setting->max_vres = 1200;
		break;
	case 1920:
		tmds_setting->max_vres = 1080;
		break;
	default:
		DEBUG_MSG(KERN_INFO "Unknown panel size max resolution = %d ! "
					 "set default panel size.\n", max_h);
		break;
	}

	DEBUG_MSG(KERN_INFO "DVI max pixelclock = %d\n",
		tmds_setting->max_pixel_clock);
	tmds_chip->tmds_chip_slave_addr = restore;
}

/* Get Panel Size Using EDID2 Table */
static void __devinit dvi_get_panel_size_from_DDCv2(
	struct tmds_chip_information *tmds_chip,
	struct tmds_setting_information *tmds_setting)
{
	int restore;
	unsigned char R_Buffer[2];

	DEBUG_MSG(KERN_INFO "\n dvi_get_panel_size_from_DDCv2 \n");

	restore = tmds_chip->tmds_chip_slave_addr;
	tmds_chip->tmds_chip_slave_addr = 0xA2;

	/* Horizontal: 0x76, 0x77 */
	tmds_register_read_bytes(0x76, R_Buffer, 2);
	tmds_setting->max_hres = R_Buffer[0] + (R_Buffer[1] << 8);

	switch (tmds_setting->max_hres) {
	case 640:
		tmds_setting->max_vres = 480;
		break;
	case 800:
		tmds_setting->max_vres = 600;
		break;
	case 1024:
		tmds_setting->max_vres = 768;
		break;
	case 1280:
		tmds_setting->max_vres = 1024;
		break;
	case 1400:
		tmds_setting->max_vres = 1050;
		break;
	case 1440:
		tmds_setting->max_vres = 1050;
		break;
	case 1600:
		tmds_setting->max_vres = 1200;
		break;
	default:
		DEBUG_MSG(KERN_INFO "Unknown panel size max resolution = %d! "
			"set default panel size.\n", tmds_setting->max_hres);
		break;
	}

	tmds_chip->tmds_chip_slave_addr = restore;
}

/* If Disable DVI, turn off pad */
void viafb_dvi_disable(void)
{
	if (viaparinfo->chip_info->
		tmds_chip_info.output_interface == INTERFACE_TMDS)
		/* Turn off TMDS power. */
		viafb_write_reg(CRD2, VIACR,
		viafb_read_reg(VIACR, CRD2) | 0x08);
}

static void dvi_patch_skew_dvp0(void)
{
	/* Reset data driving first: */
	viafb_write_reg_mask(SR1B, VIASR, 0, BIT1);
	viafb_write_reg_mask(SR2A, VIASR, 0, BIT4);

	switch (viaparinfo->chip_info->gfx_chip_name) {
	case UNICHROME_P4M890:
		{
			if ((viaparinfo->tmds_setting_info->h_active == 1600) &&
				(viaparinfo->tmds_setting_info->v_active ==
				1200))
				viafb_write_reg_mask(CR96, VIACR, 0x03,
					       BIT0 + BIT1 + BIT2);
			else
				viafb_write_reg_mask(CR96, VIACR, 0x07,
					       BIT0 + BIT1 + BIT2);
			break;
		}

	case UNICHROME_P4M900:
		{
			viafb_write_reg_mask(CR96, VIACR, 0x07,
				       BIT0 + BIT1 + BIT2 + BIT3);
			viafb_write_reg_mask(SR1B, VIASR, 0x02, BIT1);
			viafb_write_reg_mask(SR2A, VIASR, 0x10, BIT4);
			break;
		}

	default:
		{
			break;
		}
	}
}

static void dvi_patch_skew_dvp_low(void)
{
	switch (viaparinfo->chip_info->gfx_chip_name) {
	case UNICHROME_K8M890:
		{
			viafb_write_reg_mask(CR99, VIACR, 0x03, BIT0 + BIT1);
			break;
		}

	case UNICHROME_P4M900:
		{
			viafb_write_reg_mask(CR99, VIACR, 0x08,
				       BIT0 + BIT1 + BIT2 + BIT3);
			break;
		}

	case UNICHROME_P4M890:
		{
			viafb_write_reg_mask(CR99, VIACR, 0x0F,
				       BIT0 + BIT1 + BIT2 + BIT3);
			break;
		}

	default:
		{
			break;
		}
	}
}

/* If Enable DVI, turn off pad */
void viafb_dvi_enable(void)
{
	u8 data;

	switch (viaparinfo->chip_info->tmds_chip_info.output_interface) {
	case INTERFACE_DVP0:
		viafb_write_reg_mask(CR6B, VIACR, 0x01, BIT0);
		viafb_write_reg_mask(CR6C, VIACR, 0x21, BIT0 + BIT5);
		dvi_patch_skew_dvp0();
		if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CLE266)
			tmds_register_write(0x88, 0x3b);
		else
			/*clear CR91[5] to direct on display period
			   in the secondary diplay path */
			via_write_reg_mask(VIACR, 0x91, 0x00, 0x20);
		break;

	case INTERFACE_DVP1:
		if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CLE266)
			viafb_write_reg_mask(CR93, VIACR, 0x21, BIT0 + BIT5);

		/*fix dvi cann't be enabled with MB VT5718C4 - Al Zhang */
		if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CLE266)
			tmds_register_write(0x88, 0x3b);
		else
			/*clear CR91[5] to direct on display period
			  in the secondary diplay path */
			via_write_reg_mask(VIACR, 0x91, 0x00, 0x20);

		/*fix DVI cannot enable on EPIA-M board */
		if (viafb_platform_epia_dvi == 1) {
			viafb_write_reg_mask(CR91, VIACR, 0x1f, 0x1f);
			viafb_write_reg_mask(CR88, VIACR, 0x00, BIT6 + BIT0);
			if (viafb_bus_width == 24) {
				if (viafb_device_lcd_dualedge == 1)
					data = 0x3F;
				else
					data = 0x37;
				viafb_i2c_writebyte(viaparinfo->chip_info->
					tmds_chip_info.i2c_port,
					viaparinfo->chip_info->
					tmds_chip_info.tmds_chip_slave_addr,
					0x08, data);
			}
		}
		break;

	case INTERFACE_DFP_HIGH:
		if (viaparinfo->chip_info->gfx_chip_name != UNICHROME_CLE266)
			via_write_reg_mask(VIACR, CR97, 0x03, 0x03);

		via_write_reg_mask(VIACR, 0x91, 0x00, 0x20);
		break;

	case INTERFACE_DFP_LOW:
		if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CLE266)
			break;

		dvi_patch_skew_dvp_low();
		via_write_reg_mask(VIACR, 0x91, 0x00, 0x20);
		break;

	case INTERFACE_TMDS:
		/* Turn on Display period in the panel path. */
		viafb_write_reg_mask(CR91, VIACR, 0, BIT7);

		/* Turn on TMDS power. */
		viafb_write_reg_mask(CRD2, VIACR, 0, BIT3);
		break;
	}

	if (viaparinfo->tmds_setting_info->iga_path == IGA2) {
		/* Disable LCD Scaling */
		viafb_write_reg_mask(CR79, VIACR, 0x00, BIT0);
	}
}
OpenPOWER on IntegriCloud