summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/nouveau/dispnv04/dac.c
blob: d6b8e0cce2ac91f162dbacd9e789ae98c215f131 (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
/*
 * Copyright 2003 NVIDIA, Corporation
 * Copyright 2006 Dave Airlie
 * Copyright 2007 Maarten Maathuis
 * Copyright 2007-2009 Stuart Bennett
 *
 * 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.
 */

#include <drm/drm_modeset_helper_vtables.h>

#include "nouveau_drv.h"
#include "nouveau_encoder.h"
#include "nouveau_connector.h"
#include "nouveau_crtc.h"
#include "hw.h"
#include "nvreg.h"

#include <subdev/bios/gpio.h>
#include <subdev/gpio.h>

#include <nvif/timer.h>

int nv04_dac_output_offset(struct drm_encoder *encoder)
{
	struct dcb_output *dcb = nouveau_encoder(encoder)->dcb;
	int offset = 0;

	if (dcb->or & (8 | DCB_OUTPUT_C))
		offset += 0x68;
	if (dcb->or & (8 | DCB_OUTPUT_B))
		offset += 0x2000;

	return offset;
}

/*
 * arbitrary limit to number of sense oscillations tolerated in one sample
 * period (observed to be at least 13 in "nvidia")
 */
#define MAX_HBLANK_OSC 20

/*
 * arbitrary limit to number of conflicting sample pairs to tolerate at a
 * voltage step (observed to be at least 5 in "nvidia")
 */
#define MAX_SAMPLE_PAIRS 10

static int sample_load_twice(struct drm_device *dev, bool sense[2])
{
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct nvif_object *device = &drm->client.device.object;
	int i;

	for (i = 0; i < 2; i++) {
		bool sense_a, sense_b, sense_b_prime;
		int j = 0;

		/*
		 * wait for bit 0 clear -- out of hblank -- (say reg value 0x4),
		 * then wait for transition 0x4->0x5->0x4: enter hblank, leave
		 * hblank again
		 * use a 10ms timeout (guards against crtc being inactive, in
		 * which case blank state would never change)
		 */
		if (nvif_msec(&drm->client.device, 10,
			if (!(nvif_rd32(device, NV_PRMCIO_INP0__COLOR) & 1))
				break;
		) < 0)
			return -EBUSY;

		if (nvif_msec(&drm->client.device, 10,
			if ( (nvif_rd32(device, NV_PRMCIO_INP0__COLOR) & 1))
				break;
		) < 0)
			return -EBUSY;

		if (nvif_msec(&drm->client.device, 10,
			if (!(nvif_rd32(device, NV_PRMCIO_INP0__COLOR) & 1))
				break;
		) < 0)
			return -EBUSY;

		udelay(100);
		/* when level triggers, sense is _LO_ */
		sense_a = nvif_rd08(device, NV_PRMCIO_INP0) & 0x10;

		/* take another reading until it agrees with sense_a... */
		do {
			udelay(100);
			sense_b = nvif_rd08(device, NV_PRMCIO_INP0) & 0x10;
			if (sense_a != sense_b) {
				sense_b_prime =
					nvif_rd08(device, NV_PRMCIO_INP0) & 0x10;
				if (sense_b == sense_b_prime) {
					/* ... unless two consecutive subsequent
					 * samples agree; sense_a is replaced */
					sense_a = sense_b;
					/* force mis-match so we loop */
					sense_b = !sense_a;
				}
			}
		} while ((sense_a != sense_b) && ++j < MAX_HBLANK_OSC);

		if (j == MAX_HBLANK_OSC)
			/* with so much oscillation, default to sense:LO */
			sense[i] = false;
		else
			sense[i] = sense_a;
	}

	return 0;
}

static enum drm_connector_status nv04_dac_detect(struct drm_encoder *encoder,
						 struct drm_connector *connector)
{
	struct drm_device *dev = encoder->dev;
	struct nvif_object *device = &nouveau_drm(dev)->client.device.object;
	struct nouveau_drm *drm = nouveau_drm(dev);
	uint8_t saved_seq1, saved_pi, saved_rpc1, saved_cr_mode;
	uint8_t saved_palette0[3], saved_palette_mask;
	uint32_t saved_rtest_ctrl, saved_rgen_ctrl;
	int i;
	uint8_t blue;
	bool sense = true;

	/*
	 * for this detection to work, there needs to be a mode set up on the
	 * CRTC.  this is presumed to be the case
	 */

	if (nv_two_heads(dev))
		/* only implemented for head A for now */
		NVSetOwner(dev, 0);

	saved_cr_mode = NVReadVgaCrtc(dev, 0, NV_CIO_CR_MODE_INDEX);
	NVWriteVgaCrtc(dev, 0, NV_CIO_CR_MODE_INDEX, saved_cr_mode | 0x80);

	saved_seq1 = NVReadVgaSeq(dev, 0, NV_VIO_SR_CLOCK_INDEX);
	NVWriteVgaSeq(dev, 0, NV_VIO_SR_CLOCK_INDEX, saved_seq1 & ~0x20);

	saved_rtest_ctrl = NVReadRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL);
	NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL,
		      saved_rtest_ctrl & ~NV_PRAMDAC_TEST_CONTROL_PWRDWN_DAC_OFF);

	msleep(10);

	saved_pi = NVReadVgaCrtc(dev, 0, NV_CIO_CRE_PIXEL_INDEX);
	NVWriteVgaCrtc(dev, 0, NV_CIO_CRE_PIXEL_INDEX,
		       saved_pi & ~(0x80 | MASK(NV_CIO_CRE_PIXEL_FORMAT)));
	saved_rpc1 = NVReadVgaCrtc(dev, 0, NV_CIO_CRE_RPC1_INDEX);
	NVWriteVgaCrtc(dev, 0, NV_CIO_CRE_RPC1_INDEX, saved_rpc1 & ~0xc0);

	nvif_wr08(device, NV_PRMDIO_READ_MODE_ADDRESS, 0x0);
	for (i = 0; i < 3; i++)
		saved_palette0[i] = nvif_rd08(device, NV_PRMDIO_PALETTE_DATA);
	saved_palette_mask = nvif_rd08(device, NV_PRMDIO_PIXEL_MASK);
	nvif_wr08(device, NV_PRMDIO_PIXEL_MASK, 0);

	saved_rgen_ctrl = NVReadRAMDAC(dev, 0, NV_PRAMDAC_GENERAL_CONTROL);
	NVWriteRAMDAC(dev, 0, NV_PRAMDAC_GENERAL_CONTROL,
		      (saved_rgen_ctrl & ~(NV_PRAMDAC_GENERAL_CONTROL_BPC_8BITS |
					   NV_PRAMDAC_GENERAL_CONTROL_TERMINATION_75OHM)) |
		      NV_PRAMDAC_GENERAL_CONTROL_PIXMIX_ON);

	blue = 8;	/* start of test range */

	do {
		bool sense_pair[2];

		nvif_wr08(device, NV_PRMDIO_WRITE_MODE_ADDRESS, 0);
		nvif_wr08(device, NV_PRMDIO_PALETTE_DATA, 0);
		nvif_wr08(device, NV_PRMDIO_PALETTE_DATA, 0);
		/* testing blue won't find monochrome monitors.  I don't care */
		nvif_wr08(device, NV_PRMDIO_PALETTE_DATA, blue);

		i = 0;
		/* take sample pairs until both samples in the pair agree */
		do {
			if (sample_load_twice(dev, sense_pair))
				goto out;
		} while ((sense_pair[0] != sense_pair[1]) &&
							++i < MAX_SAMPLE_PAIRS);

		if (i == MAX_SAMPLE_PAIRS)
			/* too much oscillation defaults to LO */
			sense = false;
		else
			sense = sense_pair[0];

	/*
	 * if sense goes LO before blue ramps to 0x18, monitor is not connected.
	 * ergo, if blue gets to 0x18, monitor must be connected
	 */
	} while (++blue < 0x18 && sense);

out:
	nvif_wr08(device, NV_PRMDIO_PIXEL_MASK, saved_palette_mask);
	NVWriteRAMDAC(dev, 0, NV_PRAMDAC_GENERAL_CONTROL, saved_rgen_ctrl);
	nvif_wr08(device, NV_PRMDIO_WRITE_MODE_ADDRESS, 0);
	for (i = 0; i < 3; i++)
		nvif_wr08(device, NV_PRMDIO_PALETTE_DATA, saved_palette0[i]);
	NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL, saved_rtest_ctrl);
	NVWriteVgaCrtc(dev, 0, NV_CIO_CRE_PIXEL_INDEX, saved_pi);
	NVWriteVgaCrtc(dev, 0, NV_CIO_CRE_RPC1_INDEX, saved_rpc1);
	NVWriteVgaSeq(dev, 0, NV_VIO_SR_CLOCK_INDEX, saved_seq1);
	NVWriteVgaCrtc(dev, 0, NV_CIO_CR_MODE_INDEX, saved_cr_mode);

	if (blue == 0x18) {
		NV_DEBUG(drm, "Load detected on head A\n");
		return connector_status_connected;
	}

	return connector_status_disconnected;
}

uint32_t nv17_dac_sample_load(struct drm_encoder *encoder)
{
	struct drm_device *dev = encoder->dev;
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct nvif_object *device = &nouveau_drm(dev)->client.device.object;
	struct nvkm_gpio *gpio = nvxx_gpio(&drm->client.device);
	struct dcb_output *dcb = nouveau_encoder(encoder)->dcb;
	uint32_t sample, testval, regoffset = nv04_dac_output_offset(encoder);
	uint32_t saved_powerctrl_2 = 0, saved_powerctrl_4 = 0, saved_routput,
		saved_rtest_ctrl, saved_gpio0 = 0, saved_gpio1 = 0, temp, routput;
	int head;

#define RGB_TEST_DATA(r, g, b) (r << 0 | g << 10 | b << 20)
	if (dcb->type == DCB_OUTPUT_TV) {
		testval = RGB_TEST_DATA(0xa0, 0xa0, 0xa0);

		if (drm->vbios.tvdactestval)
			testval = drm->vbios.tvdactestval;
	} else {
		testval = RGB_TEST_DATA(0x140, 0x140, 0x140); /* 0x94050140 */

		if (drm->vbios.dactestval)
			testval = drm->vbios.dactestval;
	}

	saved_rtest_ctrl = NVReadRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + regoffset);
	NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + regoffset,
		      saved_rtest_ctrl & ~NV_PRAMDAC_TEST_CONTROL_PWRDWN_DAC_OFF);

	saved_powerctrl_2 = nvif_rd32(device, NV_PBUS_POWERCTRL_2);

	nvif_wr32(device, NV_PBUS_POWERCTRL_2, saved_powerctrl_2 & 0xd7ffffff);
	if (regoffset == 0x68) {
		saved_powerctrl_4 = nvif_rd32(device, NV_PBUS_POWERCTRL_4);
		nvif_wr32(device, NV_PBUS_POWERCTRL_4, saved_powerctrl_4 & 0xffffffcf);
	}

	if (gpio) {
		saved_gpio1 = nvkm_gpio_get(gpio, 0, DCB_GPIO_TVDAC1, 0xff);
		saved_gpio0 = nvkm_gpio_get(gpio, 0, DCB_GPIO_TVDAC0, 0xff);
		nvkm_gpio_set(gpio, 0, DCB_GPIO_TVDAC1, 0xff, dcb->type == DCB_OUTPUT_TV);
		nvkm_gpio_set(gpio, 0, DCB_GPIO_TVDAC0, 0xff, dcb->type == DCB_OUTPUT_TV);
	}

	msleep(4);

	saved_routput = NVReadRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + regoffset);
	head = (saved_routput & 0x100) >> 8;

	/* if there's a spare crtc, using it will minimise flicker */
	if (!(NVReadVgaCrtc(dev, head, NV_CIO_CRE_RPC1_INDEX) & 0xC0))
		head ^= 1;

	/* nv driver and nv31 use 0xfffffeee, nv34 and 6600 use 0xfffffece */
	routput = (saved_routput & 0xfffffece) | head << 8;

	if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_CURIE) {
		if (dcb->type == DCB_OUTPUT_TV)
			routput |= 0x1a << 16;
		else
			routput &= ~(0x1a << 16);
	}

	NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + regoffset, routput);
	msleep(1);

	temp = NVReadRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + regoffset);
	NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + regoffset, temp | 1);

	NVWriteRAMDAC(dev, head, NV_PRAMDAC_TESTPOINT_DATA,
		      NV_PRAMDAC_TESTPOINT_DATA_NOTBLANK | testval);
	temp = NVReadRAMDAC(dev, head, NV_PRAMDAC_TEST_CONTROL);
	NVWriteRAMDAC(dev, head, NV_PRAMDAC_TEST_CONTROL,
		      temp | NV_PRAMDAC_TEST_CONTROL_TP_INS_EN_ASSERTED);
	msleep(5);

	sample = NVReadRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + regoffset);
	/* do it again just in case it's a residual current */
	sample &= NVReadRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + regoffset);

	temp = NVReadRAMDAC(dev, head, NV_PRAMDAC_TEST_CONTROL);
	NVWriteRAMDAC(dev, head, NV_PRAMDAC_TEST_CONTROL,
		      temp & ~NV_PRAMDAC_TEST_CONTROL_TP_INS_EN_ASSERTED);
	NVWriteRAMDAC(dev, head, NV_PRAMDAC_TESTPOINT_DATA, 0);

	/* bios does something more complex for restoring, but I think this is good enough */
	NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + regoffset, saved_routput);
	NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + regoffset, saved_rtest_ctrl);
	if (regoffset == 0x68)
		nvif_wr32(device, NV_PBUS_POWERCTRL_4, saved_powerctrl_4);
	nvif_wr32(device, NV_PBUS_POWERCTRL_2, saved_powerctrl_2);

	if (gpio) {
		nvkm_gpio_set(gpio, 0, DCB_GPIO_TVDAC1, 0xff, saved_gpio1);
		nvkm_gpio_set(gpio, 0, DCB_GPIO_TVDAC0, 0xff, saved_gpio0);
	}

	return sample;
}

static enum drm_connector_status
nv17_dac_detect(struct drm_encoder *encoder, struct drm_connector *connector)
{
	struct nouveau_drm *drm = nouveau_drm(encoder->dev);
	struct dcb_output *dcb = nouveau_encoder(encoder)->dcb;

	if (nv04_dac_in_use(encoder))
		return connector_status_disconnected;

	if (nv17_dac_sample_load(encoder) &
	    NV_PRAMDAC_TEST_CONTROL_SENSEB_ALLHI) {
		NV_DEBUG(drm, "Load detected on output %c\n",
			 '@' + ffs(dcb->or));
		return connector_status_connected;
	} else {
		return connector_status_disconnected;
	}
}

static bool nv04_dac_mode_fixup(struct drm_encoder *encoder,
				const struct drm_display_mode *mode,
				struct drm_display_mode *adjusted_mode)
{
	if (nv04_dac_in_use(encoder))
		return false;

	return true;
}

static void nv04_dac_prepare(struct drm_encoder *encoder)
{
	const struct drm_encoder_helper_funcs *helper = encoder->helper_private;
	struct drm_device *dev = encoder->dev;
	int head = nouveau_crtc(encoder->crtc)->index;

	helper->dpms(encoder, DRM_MODE_DPMS_OFF);

	nv04_dfp_disable(dev, head);
}

static void nv04_dac_mode_set(struct drm_encoder *encoder,
			      struct drm_display_mode *mode,
			      struct drm_display_mode *adjusted_mode)
{
	struct drm_device *dev = encoder->dev;
	struct nouveau_drm *drm = nouveau_drm(dev);
	int head = nouveau_crtc(encoder->crtc)->index;

	if (nv_gf4_disp_arch(dev)) {
		struct drm_encoder *rebind;
		uint32_t dac_offset = nv04_dac_output_offset(encoder);
		uint32_t otherdac;

		/* bit 16-19 are bits that are set on some G70 cards,
		 * but don't seem to have much effect */
		NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + dac_offset,
			      head << 8 | NV_PRAMDAC_DACCLK_SEL_DACCLK);
		/* force any other vga encoders to bind to the other crtc */
		list_for_each_entry(rebind, &dev->mode_config.encoder_list, head) {
			if (rebind == encoder
			    || nouveau_encoder(rebind)->dcb->type != DCB_OUTPUT_ANALOG)
				continue;

			dac_offset = nv04_dac_output_offset(rebind);
			otherdac = NVReadRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + dac_offset);
			NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + dac_offset,
				      (otherdac & ~0x0100) | (head ^ 1) << 8);
		}
	}

	/* This could use refinement for flatpanels, but it should work this way */
	if (drm->client.device.info.chipset < 0x44)
		NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + nv04_dac_output_offset(encoder), 0xf0000000);
	else
		NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + nv04_dac_output_offset(encoder), 0x00100000);
}

static void nv04_dac_commit(struct drm_encoder *encoder)
{
	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
	struct nouveau_drm *drm = nouveau_drm(encoder->dev);
	struct nouveau_crtc *nv_crtc = nouveau_crtc(encoder->crtc);
	const struct drm_encoder_helper_funcs *helper = encoder->helper_private;

	helper->dpms(encoder, DRM_MODE_DPMS_ON);

	NV_DEBUG(drm, "Output %s is running on CRTC %d using output %c\n",
		 nv04_encoder_get_connector(nv_encoder)->base.name,
		 nv_crtc->index, '@' + ffs(nv_encoder->dcb->or));
}

void nv04_dac_update_dacclk(struct drm_encoder *encoder, bool enable)
{
	struct drm_device *dev = encoder->dev;
	struct dcb_output *dcb = nouveau_encoder(encoder)->dcb;

	if (nv_gf4_disp_arch(dev)) {
		uint32_t *dac_users = &nv04_display(dev)->dac_users[ffs(dcb->or) - 1];
		int dacclk_off = NV_PRAMDAC_DACCLK + nv04_dac_output_offset(encoder);
		uint32_t dacclk = NVReadRAMDAC(dev, 0, dacclk_off);

		if (enable) {
			*dac_users |= 1 << dcb->index;
			NVWriteRAMDAC(dev, 0, dacclk_off, dacclk | NV_PRAMDAC_DACCLK_SEL_DACCLK);

		} else {
			*dac_users &= ~(1 << dcb->index);
			if (!*dac_users)
				NVWriteRAMDAC(dev, 0, dacclk_off,
					dacclk & ~NV_PRAMDAC_DACCLK_SEL_DACCLK);
		}
	}
}

/* Check if the DAC corresponding to 'encoder' is being used by
 * someone else. */
bool nv04_dac_in_use(struct drm_encoder *encoder)
{
	struct drm_device *dev = encoder->dev;
	struct dcb_output *dcb = nouveau_encoder(encoder)->dcb;

	return nv_gf4_disp_arch(encoder->dev) &&
		(nv04_display(dev)->dac_users[ffs(dcb->or) - 1] & ~(1 << dcb->index));
}

static void nv04_dac_dpms(struct drm_encoder *encoder, int mode)
{
	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
	struct nouveau_drm *drm = nouveau_drm(encoder->dev);

	if (nv_encoder->last_dpms == mode)
		return;
	nv_encoder->last_dpms = mode;

	NV_DEBUG(drm, "Setting dpms mode %d on vga encoder (output %d)\n",
		 mode, nv_encoder->dcb->index);

	nv04_dac_update_dacclk(encoder, mode == DRM_MODE_DPMS_ON);
}

static void nv04_dac_save(struct drm_encoder *encoder)
{
	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
	struct drm_device *dev = encoder->dev;

	if (nv_gf4_disp_arch(dev))
		nv_encoder->restore.output = NVReadRAMDAC(dev, 0, NV_PRAMDAC_DACCLK +
							  nv04_dac_output_offset(encoder));
}

static void nv04_dac_restore(struct drm_encoder *encoder)
{
	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
	struct drm_device *dev = encoder->dev;

	if (nv_gf4_disp_arch(dev))
		NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + nv04_dac_output_offset(encoder),
			      nv_encoder->restore.output);

	nv_encoder->last_dpms = NV_DPMS_CLEARED;
}

static void nv04_dac_destroy(struct drm_encoder *encoder)
{
	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);

	drm_encoder_cleanup(encoder);
	kfree(nv_encoder);
}

static const struct drm_encoder_helper_funcs nv04_dac_helper_funcs = {
	.dpms = nv04_dac_dpms,
	.mode_fixup = nv04_dac_mode_fixup,
	.prepare = nv04_dac_prepare,
	.commit = nv04_dac_commit,
	.mode_set = nv04_dac_mode_set,
	.detect = nv04_dac_detect
};

static const struct drm_encoder_helper_funcs nv17_dac_helper_funcs = {
	.dpms = nv04_dac_dpms,
	.mode_fixup = nv04_dac_mode_fixup,
	.prepare = nv04_dac_prepare,
	.commit = nv04_dac_commit,
	.mode_set = nv04_dac_mode_set,
	.detect = nv17_dac_detect
};

static const struct drm_encoder_funcs nv04_dac_funcs = {
	.destroy = nv04_dac_destroy,
};

int
nv04_dac_create(struct drm_connector *connector, struct dcb_output *entry)
{
	const struct drm_encoder_helper_funcs *helper;
	struct nouveau_encoder *nv_encoder = NULL;
	struct drm_device *dev = connector->dev;
	struct drm_encoder *encoder;

	nv_encoder = kzalloc(sizeof(*nv_encoder), GFP_KERNEL);
	if (!nv_encoder)
		return -ENOMEM;

	encoder = to_drm_encoder(nv_encoder);

	nv_encoder->dcb = entry;
	nv_encoder->or = ffs(entry->or) - 1;

	nv_encoder->enc_save = nv04_dac_save;
	nv_encoder->enc_restore = nv04_dac_restore;

	if (nv_gf4_disp_arch(dev))
		helper = &nv17_dac_helper_funcs;
	else
		helper = &nv04_dac_helper_funcs;

	drm_encoder_init(dev, encoder, &nv04_dac_funcs, DRM_MODE_ENCODER_DAC,
			 NULL);
	drm_encoder_helper_add(encoder, helper);

	encoder->possible_crtcs = entry->heads;
	encoder->possible_clones = 0;

	drm_connector_attach_encoder(connector, encoder);
	return 0;
}