drivers/gpu/drm/nouveau/dispnv04/dac.c

   1 /*
   2  * Copyright 2003 NVIDIA, Corporation
   3  * Copyright 2006 Dave Airlie
   4  * Copyright 2007 Maarten Maathuis
   5  * Copyright 2007-2009 Stuart Bennett
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the next
  15  * paragraph) shall be included in all copies or substantial portions of the
  16  * Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  24  * DEALINGS IN THE SOFTWARE.
  25  */
  26
  27 #include <drm/drm_crtc_helper.h>
  28
  29 #include "nouveau_drv.h"
  30 #include "nouveau_encoder.h"
  31 #include "nouveau_connector.h"
  32 #include "nouveau_crtc.h"
  33 #include "hw.h"
  34 #include "nvreg.h"
  35
  36 #include <subdev/bios/gpio.h>
  37 #include <subdev/gpio.h>
  38 #include <subdev/timer.h>
  39
  40 int nv04_dac_output_offset(struct drm_encoder *encoder)
  41 {
  42         struct dcb_output *dcb = nouveau_encoder(encoder)->dcb;
  43         int offset = 0;
  44
  45         if (dcb->or & (8 | DCB_OUTPUT_C))
  46                 offset += 0x68;
  47         if (dcb->or & (8 | DCB_OUTPUT_B))
  48                 offset += 0x2000;
  49
  50         return offset;
  51 }
  52
  53 /*
  54  * arbitrary limit to number of sense oscillations tolerated in one sample
  55  * period (observed to be at least 13 in "nvidia")
  56  */
  57 #define MAX_HBLANK_OSC 20
  58
  59 /*
  60  * arbitrary limit to number of conflicting sample pairs to tolerate at a
  61  * voltage step (observed to be at least 5 in "nvidia")
  62  */
  63 #define MAX_SAMPLE_PAIRS 10
  64
  65 static int sample_load_twice(struct drm_device *dev, bool sense[2])
  66 {
  67         struct nouveau_drm *drm = nouveau_drm(dev);
  68         struct nvif_object *device = &drm->client.device.object;
  69         int i;
  70
  71         for (i = 0; i < 2; i++) {
  72                 bool sense_a, sense_b, sense_b_prime;
  73                 int j = 0;
  74
  75                 /*
  76                  * wait for bit 0 clear -- out of hblank -- (say reg value 0x4),
  77                  * then wait for transition 0x4->0x5->0x4: enter hblank, leave
  78                  * hblank again
  79                  * use a 10ms timeout (guards against crtc being inactive, in
  80                  * which case blank state would never change)
  81                  */
  82                 if (nvif_msec(&drm->client.device, 10,
  83                         if (!(nvif_rd32(device, NV_PRMCIO_INP0__COLOR) & 1))
  84                                 break;
  85                 ) < 0)
  86                         return -EBUSY;
  87
  88                 if (nvif_msec(&drm->client.device, 10,
  89                         if ( (nvif_rd32(device, NV_PRMCIO_INP0__COLOR) & 1))
  90                                 break;
  91                 ) < 0)
  92                         return -EBUSY;
  93
  94                 if (nvif_msec(&drm->client.device, 10,
  95                         if (!(nvif_rd32(device, NV_PRMCIO_INP0__COLOR) & 1))
  96                                 break;
  97                 ) < 0)
  98                         return -EBUSY;
  99
 100                 udelay(100);
 101                 /* when level triggers, sense is _LO_ */
 102                 sense_a = nvif_rd08(device, NV_PRMCIO_INP0) & 0x10;
 103
 104                 /* take another reading until it agrees with sense_a... */
 105                 do {
 106                         udelay(100);
 107                         sense_b = nvif_rd08(device, NV_PRMCIO_INP0) & 0x10;
 108                         if (sense_a != sense_b) {
 109                                 sense_b_prime =
 110                                         nvif_rd08(device, NV_PRMCIO_INP0) & 0x10;
 111                                 if (sense_b == sense_b_prime) {
 112                                         /* ... unless two consecutive subsequent
 113                                          * samples agree; sense_a is replaced */
 114                                         sense_a = sense_b;
 115                                         /* force mis-match so we loop */
 116                                         sense_b = !sense_a;
 117                                 }
 118                         }
 119                 } while ((sense_a != sense_b) && ++j < MAX_HBLANK_OSC);
 120
 121                 if (j == MAX_HBLANK_OSC)
 122                         /* with so much oscillation, default to sense:LO */
 123                         sense[i] = false;
 124                 else
 125                         sense[i] = sense_a;
 126         }
 127
 128         return 0;
 129 }
 130
 131 static enum drm_connector_status nv04_dac_detect(struct drm_encoder *encoder,
 132                                                  struct drm_connector *connector)
 133 {
 134         struct drm_device *dev = encoder->dev;
 135         struct nvif_object *device = &nouveau_drm(dev)->client.device.object;
 136         struct nouveau_drm *drm = nouveau_drm(dev);
 137         uint8_t saved_seq1, saved_pi, saved_rpc1, saved_cr_mode;
 138         uint8_t saved_palette0[3], saved_palette_mask;
 139         uint32_t saved_rtest_ctrl, saved_rgen_ctrl;
 140         int i;
 141         uint8_t blue;
 142         bool sense = true;
 143
 144         /*
 145          * for this detection to work, there needs to be a mode set up on the
 146          * CRTC.  this is presumed to be the case
 147          */
 148
 149         if (nv_two_heads(dev))
 150                 /* only implemented for head A for now */
 151                 NVSetOwner(dev, 0);
 152
 153         saved_cr_mode = NVReadVgaCrtc(dev, 0, NV_CIO_CR_MODE_INDEX);
 154         NVWriteVgaCrtc(dev, 0, NV_CIO_CR_MODE_INDEX, saved_cr_mode | 0x80);
 155
 156         saved_seq1 = NVReadVgaSeq(dev, 0, NV_VIO_SR_CLOCK_INDEX);
 157         NVWriteVgaSeq(dev, 0, NV_VIO_SR_CLOCK_INDEX, saved_seq1 & ~0x20);
 158
 159         saved_rtest_ctrl = NVReadRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL);
 160         NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL,
 161                       saved_rtest_ctrl & ~NV_PRAMDAC_TEST_CONTROL_PWRDWN_DAC_OFF);
 162
 163         msleep(10);
 164
 165         saved_pi = NVReadVgaCrtc(dev, 0, NV_CIO_CRE_PIXEL_INDEX);
 166         NVWriteVgaCrtc(dev, 0, NV_CIO_CRE_PIXEL_INDEX,
 167                        saved_pi & ~(0x80 | MASK(NV_CIO_CRE_PIXEL_FORMAT)));
 168         saved_rpc1 = NVReadVgaCrtc(dev, 0, NV_CIO_CRE_RPC1_INDEX);
 169         NVWriteVgaCrtc(dev, 0, NV_CIO_CRE_RPC1_INDEX, saved_rpc1 & ~0xc0);
 170
 171         nvif_wr08(device, NV_PRMDIO_READ_MODE_ADDRESS, 0x0);
 172         for (i = 0; i < 3; i++)
 173                 saved_palette0[i] = nvif_rd08(device, NV_PRMDIO_PALETTE_DATA);
 174         saved_palette_mask = nvif_rd08(device, NV_PRMDIO_PIXEL_MASK);
 175         nvif_wr08(device, NV_PRMDIO_PIXEL_MASK, 0);
 176
 177         saved_rgen_ctrl = NVReadRAMDAC(dev, 0, NV_PRAMDAC_GENERAL_CONTROL);
 178         NVWriteRAMDAC(dev, 0, NV_PRAMDAC_GENERAL_CONTROL,
 179                       (saved_rgen_ctrl & ~(NV_PRAMDAC_GENERAL_CONTROL_BPC_8BITS |
 180                                            NV_PRAMDAC_GENERAL_CONTROL_TERMINATION_75OHM)) |
 181                       NV_PRAMDAC_GENERAL_CONTROL_PIXMIX_ON);
 182
 183         blue = 8;       /* start of test range */
 184
 185         do {
 186                 bool sense_pair[2];
 187
 188                 nvif_wr08(device, NV_PRMDIO_WRITE_MODE_ADDRESS, 0);
 189                 nvif_wr08(device, NV_PRMDIO_PALETTE_DATA, 0);
 190                 nvif_wr08(device, NV_PRMDIO_PALETTE_DATA, 0);
 191                 /* testing blue won't find monochrome monitors.  I don't care */
 192                 nvif_wr08(device, NV_PRMDIO_PALETTE_DATA, blue);
 193
 194                 i = 0;
 195                 /* take sample pairs until both samples in the pair agree */
 196                 do {
 197                         if (sample_load_twice(dev, sense_pair))
 198                                 goto out;
 199                 } while ((sense_pair[0] != sense_pair[1]) &&
 200                                                         ++i < MAX_SAMPLE_PAIRS);
 201
 202                 if (i == MAX_SAMPLE_PAIRS)
 203                         /* too much oscillation defaults to LO */
 204                         sense = false;
 205                 else
 206                         sense = sense_pair[0];
 207
 208         /*
 209          * if sense goes LO before blue ramps to 0x18, monitor is not connected.
 210          * ergo, if blue gets to 0x18, monitor must be connected
 211          */
 212         } while (++blue < 0x18 && sense);
 213
 214 out:
 215         nvif_wr08(device, NV_PRMDIO_PIXEL_MASK, saved_palette_mask);
 216         NVWriteRAMDAC(dev, 0, NV_PRAMDAC_GENERAL_CONTROL, saved_rgen_ctrl);
 217         nvif_wr08(device, NV_PRMDIO_WRITE_MODE_ADDRESS, 0);
 218         for (i = 0; i < 3; i++)
 219                 nvif_wr08(device, NV_PRMDIO_PALETTE_DATA, saved_palette0[i]);
 220         NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL, saved_rtest_ctrl);
 221         NVWriteVgaCrtc(dev, 0, NV_CIO_CRE_PIXEL_INDEX, saved_pi);
 222         NVWriteVgaCrtc(dev, 0, NV_CIO_CRE_RPC1_INDEX, saved_rpc1);
 223         NVWriteVgaSeq(dev, 0, NV_VIO_SR_CLOCK_INDEX, saved_seq1);
 224         NVWriteVgaCrtc(dev, 0, NV_CIO_CR_MODE_INDEX, saved_cr_mode);
 225
 226         if (blue == 0x18) {
 227                 NV_DEBUG(drm, "Load detected on head A\n");
 228                 return connector_status_connected;
 229         }
 230
 231         return connector_status_disconnected;
 232 }
 233
 234 uint32_t nv17_dac_sample_load(struct drm_encoder *encoder)
 235 {
 236         struct drm_device *dev = encoder->dev;
 237         struct nouveau_drm *drm = nouveau_drm(dev);
 238         struct nvif_object *device = &nouveau_drm(dev)->client.device.object;
 239         struct nvkm_gpio *gpio = nvxx_gpio(&drm->client.device);
 240         struct dcb_output *dcb = nouveau_encoder(encoder)->dcb;
 241         uint32_t sample, testval, regoffset = nv04_dac_output_offset(encoder);
 242         uint32_t saved_powerctrl_2 = 0, saved_powerctrl_4 = 0, saved_routput,
 243                 saved_rtest_ctrl, saved_gpio0 = 0, saved_gpio1 = 0, temp, routput;
 244         int head;
 245
 246 #define RGB_TEST_DATA(r, g, b) (r << 0 | g << 10 | b << 20)
 247         if (dcb->type == DCB_OUTPUT_TV) {
 248                 testval = RGB_TEST_DATA(0xa0, 0xa0, 0xa0);
 249
 250                 if (drm->vbios.tvdactestval)
 251                         testval = drm->vbios.tvdactestval;
 252         } else {
 253                 testval = RGB_TEST_DATA(0x140, 0x140, 0x140); /* 0x94050140 */
 254
 255                 if (drm->vbios.dactestval)
 256                         testval = drm->vbios.dactestval;
 257         }
 258
 259         saved_rtest_ctrl = NVReadRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + regoffset);
 260         NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + regoffset,
 261                       saved_rtest_ctrl & ~NV_PRAMDAC_TEST_CONTROL_PWRDWN_DAC_OFF);
 262
 263         saved_powerctrl_2 = nvif_rd32(device, NV_PBUS_POWERCTRL_2);
 264
 265         nvif_wr32(device, NV_PBUS_POWERCTRL_2, saved_powerctrl_2 & 0xd7ffffff);
 266         if (regoffset == 0x68) {
 267                 saved_powerctrl_4 = nvif_rd32(device, NV_PBUS_POWERCTRL_4);
 268                 nvif_wr32(device, NV_PBUS_POWERCTRL_4, saved_powerctrl_4 & 0xffffffcf);
 269         }
 270
 271         if (gpio) {
 272                 saved_gpio1 = nvkm_gpio_get(gpio, 0, DCB_GPIO_TVDAC1, 0xff);
 273                 saved_gpio0 = nvkm_gpio_get(gpio, 0, DCB_GPIO_TVDAC0, 0xff);
 274                 nvkm_gpio_set(gpio, 0, DCB_GPIO_TVDAC1, 0xff, dcb->type == DCB_OUTPUT_TV);
 275                 nvkm_gpio_set(gpio, 0, DCB_GPIO_TVDAC0, 0xff, dcb->type == DCB_OUTPUT_TV);
 276         }
 277
 278         msleep(4);
 279
 280         saved_routput = NVReadRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + regoffset);
 281         head = (saved_routput & 0x100) >> 8;
 282
 283         /* if there's a spare crtc, using it will minimise flicker */
 284         if (!(NVReadVgaCrtc(dev, head, NV_CIO_CRE_RPC1_INDEX) & 0xC0))
 285                 head ^= 1;
 286
 287         /* nv driver and nv31 use 0xfffffeee, nv34 and 6600 use 0xfffffece */
 288         routput = (saved_routput & 0xfffffece) | head << 8;
 289
 290         if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_CURIE) {
 291                 if (dcb->type == DCB_OUTPUT_TV)
 292                         routput |= 0x1a << 16;
 293                 else
 294                         routput &= ~(0x1a << 16);
 295         }
 296
 297         NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + regoffset, routput);
 298         msleep(1);
 299
 300         temp = NVReadRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + regoffset);
 301         NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + regoffset, temp | 1);
 302
 303         NVWriteRAMDAC(dev, head, NV_PRAMDAC_TESTPOINT_DATA,
 304                       NV_PRAMDAC_TESTPOINT_DATA_NOTBLANK | testval);
 305         temp = NVReadRAMDAC(dev, head, NV_PRAMDAC_TEST_CONTROL);
 306         NVWriteRAMDAC(dev, head, NV_PRAMDAC_TEST_CONTROL,
 307                       temp | NV_PRAMDAC_TEST_CONTROL_TP_INS_EN_ASSERTED);
 308         msleep(5);
 309
 310         sample = NVReadRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + regoffset);
 311         /* do it again just in case it's a residual current */
 312         sample &= NVReadRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + regoffset);
 313
 314         temp = NVReadRAMDAC(dev, head, NV_PRAMDAC_TEST_CONTROL);
 315         NVWriteRAMDAC(dev, head, NV_PRAMDAC_TEST_CONTROL,
 316                       temp & ~NV_PRAMDAC_TEST_CONTROL_TP_INS_EN_ASSERTED);
 317         NVWriteRAMDAC(dev, head, NV_PRAMDAC_TESTPOINT_DATA, 0);
 318
 319         /* bios does something more complex for restoring, but I think this is good enough */
 320         NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + regoffset, saved_routput);
 321         NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + regoffset, saved_rtest_ctrl);
 322         if (regoffset == 0x68)
 323                 nvif_wr32(device, NV_PBUS_POWERCTRL_4, saved_powerctrl_4);
 324         nvif_wr32(device, NV_PBUS_POWERCTRL_2, saved_powerctrl_2);
 325
 326         if (gpio) {
 327                 nvkm_gpio_set(gpio, 0, DCB_GPIO_TVDAC1, 0xff, saved_gpio1);
 328                 nvkm_gpio_set(gpio, 0, DCB_GPIO_TVDAC0, 0xff, saved_gpio0);
 329         }
 330
 331         return sample;
 332 }
 333
 334 static enum drm_connector_status
 335 nv17_dac_detect(struct drm_encoder *encoder, struct drm_connector *connector)
 336 {
 337         struct nouveau_drm *drm = nouveau_drm(encoder->dev);
 338         struct dcb_output *dcb = nouveau_encoder(encoder)->dcb;
 339
 340         if (nv04_dac_in_use(encoder))
 341                 return connector_status_disconnected;
 342
 343         if (nv17_dac_sample_load(encoder) &
 344             NV_PRAMDAC_TEST_CONTROL_SENSEB_ALLHI) {
 345                 NV_DEBUG(drm, "Load detected on output %c\n",
 346                          '@' + ffs(dcb->or));
 347                 return connector_status_connected;
 348         } else {
 349                 return connector_status_disconnected;
 350         }
 351 }
 352
 353 static bool nv04_dac_mode_fixup(struct drm_encoder *encoder,
 354                                 const struct drm_display_mode *mode,
 355                                 struct drm_display_mode *adjusted_mode)
 356 {
 357         if (nv04_dac_in_use(encoder))
 358                 return false;
 359
 360         return true;
 361 }
 362
 363 static void nv04_dac_prepare(struct drm_encoder *encoder)
 364 {
 365         const struct drm_encoder_helper_funcs *helper = encoder->helper_private;
 366         struct drm_device *dev = encoder->dev;
 367         int head = nouveau_crtc(encoder->crtc)->index;
 368
 369         helper->dpms(encoder, DRM_MODE_DPMS_OFF);
 370
 371         nv04_dfp_disable(dev, head);
 372 }
 373
 374 static void nv04_dac_mode_set(struct drm_encoder *encoder,
 375                               struct drm_display_mode *mode,
 376                               struct drm_display_mode *adjusted_mode)
 377 {
 378         struct drm_device *dev = encoder->dev;
 379         struct nouveau_drm *drm = nouveau_drm(dev);
 380         int head = nouveau_crtc(encoder->crtc)->index;
 381
 382         if (nv_gf4_disp_arch(dev)) {
 383                 struct drm_encoder *rebind;
 384                 uint32_t dac_offset = nv04_dac_output_offset(encoder);
 385                 uint32_t otherdac;
 386
 387                 /* bit 16-19 are bits that are set on some G70 cards,
 388                  * but don't seem to have much effect */
 389                 NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + dac_offset,
 390                               head << 8 | NV_PRAMDAC_DACCLK_SEL_DACCLK);
 391                 /* force any other vga encoders to bind to the other crtc */
 392                 list_for_each_entry(rebind, &dev->mode_config.encoder_list, head) {
 393                         if (rebind == encoder
 394                             || nouveau_encoder(rebind)->dcb->type != DCB_OUTPUT_ANALOG)
 395                                 continue;
 396
 397                         dac_offset = nv04_dac_output_offset(rebind);
 398                         otherdac = NVReadRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + dac_offset);
 399                         NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + dac_offset,
 400                                       (otherdac & ~0x0100) | (head ^ 1) << 8);
 401                 }
 402         }
 403
 404         /* This could use refinement for flatpanels, but it should work this way */
 405         if (drm->client.device.info.chipset < 0x44)
 406                 NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + nv04_dac_output_offset(encoder), 0xf0000000);
 407         else
 408                 NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + nv04_dac_output_offset(encoder), 0x00100000);
 409 }
 410
 411 static void nv04_dac_commit(struct drm_encoder *encoder)
 412 {
 413         struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
 414         struct nouveau_drm *drm = nouveau_drm(encoder->dev);
 415         struct nouveau_crtc *nv_crtc = nouveau_crtc(encoder->crtc);
 416         const struct drm_encoder_helper_funcs *helper = encoder->helper_private;
 417
 418         helper->dpms(encoder, DRM_MODE_DPMS_ON);
 419
 420         NV_DEBUG(drm, "Output %s is running on CRTC %d using output %c\n",
 421                  nouveau_encoder_connector_get(nv_encoder)->base.name,
 422                  nv_crtc->index, '@' + ffs(nv_encoder->dcb->or));
 423 }
 424
 425 void nv04_dac_update_dacclk(struct drm_encoder *encoder, bool enable)
 426 {
 427         struct drm_device *dev = encoder->dev;
 428         struct dcb_output *dcb = nouveau_encoder(encoder)->dcb;
 429
 430         if (nv_gf4_disp_arch(dev)) {
 431                 uint32_t *dac_users = &nv04_display(dev)->dac_users[ffs(dcb->or) - 1];
 432                 int dacclk_off = NV_PRAMDAC_DACCLK + nv04_dac_output_offset(encoder);
 433                 uint32_t dacclk = NVReadRAMDAC(dev, 0, dacclk_off);
 434
 435                 if (enable) {
 436                         *dac_users |= 1 << dcb->index;
 437                         NVWriteRAMDAC(dev, 0, dacclk_off, dacclk | NV_PRAMDAC_DACCLK_SEL_DACCLK);
 438
 439                 } else {
 440                         *dac_users &= ~(1 << dcb->index);
 441                         if (!*dac_users)
 442                                 NVWriteRAMDAC(dev, 0, dacclk_off,
 443                                         dacclk & ~NV_PRAMDAC_DACCLK_SEL_DACCLK);
 444                 }
 445         }
 446 }
 447
 448 /* Check if the DAC corresponding to 'encoder' is being used by
 449  * someone else. */
 450 bool nv04_dac_in_use(struct drm_encoder *encoder)
 451 {
 452         struct drm_device *dev = encoder->dev;
 453         struct dcb_output *dcb = nouveau_encoder(encoder)->dcb;
 454
 455         return nv_gf4_disp_arch(encoder->dev) &&
 456                 (nv04_display(dev)->dac_users[ffs(dcb->or) - 1] & ~(1 << dcb->index));
 457 }
 458
 459 static void nv04_dac_dpms(struct drm_encoder *encoder, int mode)
 460 {
 461         struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
 462         struct nouveau_drm *drm = nouveau_drm(encoder->dev);
 463
 464         if (nv_encoder->last_dpms == mode)
 465                 return;
 466         nv_encoder->last_dpms = mode;
 467
 468         NV_DEBUG(drm, "Setting dpms mode %d on vga encoder (output %d)\n",
 469                  mode, nv_encoder->dcb->index);
 470
 471         nv04_dac_update_dacclk(encoder, mode == DRM_MODE_DPMS_ON);
 472 }
 473
 474 static void nv04_dac_save(struct drm_encoder *encoder)
 475 {
 476         struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
 477         struct drm_device *dev = encoder->dev;
 478
 479         if (nv_gf4_disp_arch(dev))
 480                 nv_encoder->restore.output = NVReadRAMDAC(dev, 0, NV_PRAMDAC_DACCLK +
 481                                                           nv04_dac_output_offset(encoder));
 482 }
 483
 484 static void nv04_dac_restore(struct drm_encoder *encoder)
 485 {
 486         struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
 487         struct drm_device *dev = encoder->dev;
 488
 489         if (nv_gf4_disp_arch(dev))
 490                 NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + nv04_dac_output_offset(encoder),
 491                               nv_encoder->restore.output);
 492
 493         nv_encoder->last_dpms = NV_DPMS_CLEARED;
 494 }
 495
 496 static void nv04_dac_destroy(struct drm_encoder *encoder)
 497 {
 498         struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
 499
 500         drm_encoder_cleanup(encoder);
 501         kfree(nv_encoder);
 502 }
 503
 504 static const struct drm_encoder_helper_funcs nv04_dac_helper_funcs = {
 505         .dpms = nv04_dac_dpms,
 506         .mode_fixup = nv04_dac_mode_fixup,
 507         .prepare = nv04_dac_prepare,
 508         .commit = nv04_dac_commit,
 509         .mode_set = nv04_dac_mode_set,
 510         .detect = nv04_dac_detect
 511 };
 512
 513 static const struct drm_encoder_helper_funcs nv17_dac_helper_funcs = {
 514         .dpms = nv04_dac_dpms,
 515         .mode_fixup = nv04_dac_mode_fixup,
 516         .prepare = nv04_dac_prepare,
 517         .commit = nv04_dac_commit,
 518         .mode_set = nv04_dac_mode_set,
 519         .detect = nv17_dac_detect
 520 };
 521
 522 static const struct drm_encoder_funcs nv04_dac_funcs = {
 523         .destroy = nv04_dac_destroy,
 524 };
 525
 526 int
 527 nv04_dac_create(struct drm_connector *connector, struct dcb_output *entry)
 528 {
 529         const struct drm_encoder_helper_funcs *helper;
 530         struct nouveau_encoder *nv_encoder = NULL;
 531         struct drm_device *dev = connector->dev;
 532         struct drm_encoder *encoder;
 533
 534         nv_encoder = kzalloc(sizeof(*nv_encoder), GFP_KERNEL);
 535         if (!nv_encoder)
 536                 return -ENOMEM;
 537
 538         encoder = to_drm_encoder(nv_encoder);
 539
 540         nv_encoder->dcb = entry;
 541         nv_encoder->or = ffs(entry->or) - 1;
 542
 543         nv_encoder->enc_save = nv04_dac_save;
 544         nv_encoder->enc_restore = nv04_dac_restore;
 545
 546         if (nv_gf4_disp_arch(dev))
 547                 helper = &nv17_dac_helper_funcs;
 548         else
 549                 helper = &nv04_dac_helper_funcs;
 550
 551         drm_encoder_init(dev, encoder, &nv04_dac_funcs, DRM_MODE_ENCODER_DAC,
 552                          NULL);
 553         drm_encoder_helper_add(encoder, helper);
 554
 555         encoder->possible_crtcs = entry->heads;
 556         encoder->possible_clones = 0;
 557
 558         drm_connector_attach_encoder(connector, encoder);
 559         return 0;
 560 }