drivers/gpu/drm/nouveau/nv04_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/drmP.h>
  28 #include <drm/drm_crtc_helper.h>
  29
  30 #include "nouveau_drv.h"
  31 #include "nouveau_encoder.h"
  32 #include "nouveau_connector.h"
  33 #include "nouveau_crtc.h"
  34 #include "nouveau_hw.h"
  35 #include "nouveau_gpio.h"
  36 #include "nvreg.h"
  37
  38 int nv04_dac_output_offset(struct drm_encoder *encoder)
  39 {
  40         struct dcb_entry *dcb = nouveau_encoder(encoder)->dcb;
  41         int offset = 0;
  42
  43         if (dcb->or & (8 | OUTPUT_C))
  44                 offset += 0x68;
  45         if (dcb->or & (8 | OUTPUT_B))
  46                 offset += 0x2000;
  47
  48         return offset;
  49 }
  50
  51 /*
  52  * arbitrary limit to number of sense oscillations tolerated in one sample
  53  * period (observed to be at least 13 in "nvidia")
  54  */
  55 #define MAX_HBLANK_OSC 20
  56
  57 /*
  58  * arbitrary limit to number of conflicting sample pairs to tolerate at a
  59  * voltage step (observed to be at least 5 in "nvidia")
  60  */
  61 #define MAX_SAMPLE_PAIRS 10
  62
  63 static int sample_load_twice(struct drm_device *dev, bool sense[2])
  64 {
  65         int i;
  66
  67         for (i = 0; i < 2; i++) {
  68                 bool sense_a, sense_b, sense_b_prime;
  69                 int j = 0;
  70
  71                 /*
  72                  * wait for bit 0 clear -- out of hblank -- (say reg value 0x4),
  73                  * then wait for transition 0x4->0x5->0x4: enter hblank, leave
  74                  * hblank again
  75                  * use a 10ms timeout (guards against crtc being inactive, in
  76                  * which case blank state would never change)
  77                  */
  78                 if (!nouveau_wait_eq(dev, 10000000, NV_PRMCIO_INP0__COLOR,
  79                                      0x00000001, 0x00000000))
  80                         return -EBUSY;
  81                 if (!nouveau_wait_eq(dev, 10000000, NV_PRMCIO_INP0__COLOR,
  82                                      0x00000001, 0x00000001))
  83                         return -EBUSY;
  84                 if (!nouveau_wait_eq(dev, 10000000, NV_PRMCIO_INP0__COLOR,
  85                                      0x00000001, 0x00000000))
  86                         return -EBUSY;
  87
  88                 udelay(100);
  89                 /* when level triggers, sense is _LO_ */
  90                 sense_a = nv_rd08(dev, NV_PRMCIO_INP0) & 0x10;
  91
  92                 /* take another reading until it agrees with sense_a... */
  93                 do {
  94                         udelay(100);
  95                         sense_b = nv_rd08(dev, NV_PRMCIO_INP0) & 0x10;
  96                         if (sense_a != sense_b) {
  97                                 sense_b_prime =
  98                                         nv_rd08(dev, NV_PRMCIO_INP0) & 0x10;
  99                                 if (sense_b == sense_b_prime) {
 100                                         /* ... unless two consecutive subsequent
 101                                          * samples agree; sense_a is replaced */
 102                                         sense_a = sense_b;
 103                                         /* force mis-match so we loop */
 104                                         sense_b = !sense_a;
 105                                 }
 106                         }
 107                 } while ((sense_a != sense_b) && ++j < MAX_HBLANK_OSC);
 108
 109                 if (j == MAX_HBLANK_OSC)
 110                         /* with so much oscillation, default to sense:LO */
 111                         sense[i] = false;
 112                 else
 113                         sense[i] = sense_a;
 114         }
 115
 116         return 0;
 117 }
 118
 119 static enum drm_connector_status nv04_dac_detect(struct drm_encoder *encoder,
 120                                                  struct drm_connector *connector)
 121 {
 122         struct drm_device *dev = encoder->dev;
 123         uint8_t saved_seq1, saved_pi, saved_rpc1, saved_cr_mode;
 124         uint8_t saved_palette0[3], saved_palette_mask;
 125         uint32_t saved_rtest_ctrl, saved_rgen_ctrl;
 126         int i;
 127         uint8_t blue;
 128         bool sense = true;
 129
 130         /*
 131          * for this detection to work, there needs to be a mode set up on the
 132          * CRTC.  this is presumed to be the case
 133          */
 134
 135         if (nv_two_heads(dev))
 136                 /* only implemented for head A for now */
 137                 NVSetOwner(dev, 0);
 138
 139         saved_cr_mode = NVReadVgaCrtc(dev, 0, NV_CIO_CR_MODE_INDEX);
 140         NVWriteVgaCrtc(dev, 0, NV_CIO_CR_MODE_INDEX, saved_cr_mode | 0x80);
 141
 142         saved_seq1 = NVReadVgaSeq(dev, 0, NV_VIO_SR_CLOCK_INDEX);
 143         NVWriteVgaSeq(dev, 0, NV_VIO_SR_CLOCK_INDEX, saved_seq1 & ~0x20);
 144
 145         saved_rtest_ctrl = NVReadRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL);
 146         NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL,
 147                       saved_rtest_ctrl & ~NV_PRAMDAC_TEST_CONTROL_PWRDWN_DAC_OFF);
 148
 149         msleep(10);
 150
 151         saved_pi = NVReadVgaCrtc(dev, 0, NV_CIO_CRE_PIXEL_INDEX);
 152         NVWriteVgaCrtc(dev, 0, NV_CIO_CRE_PIXEL_INDEX,
 153                        saved_pi & ~(0x80 | MASK(NV_CIO_CRE_PIXEL_FORMAT)));
 154         saved_rpc1 = NVReadVgaCrtc(dev, 0, NV_CIO_CRE_RPC1_INDEX);
 155         NVWriteVgaCrtc(dev, 0, NV_CIO_CRE_RPC1_INDEX, saved_rpc1 & ~0xc0);
 156
 157         nv_wr08(dev, NV_PRMDIO_READ_MODE_ADDRESS, 0x0);
 158         for (i = 0; i < 3; i++)
 159                 saved_palette0[i] = nv_rd08(dev, NV_PRMDIO_PALETTE_DATA);
 160         saved_palette_mask = nv_rd08(dev, NV_PRMDIO_PIXEL_MASK);
 161         nv_wr08(dev, NV_PRMDIO_PIXEL_MASK, 0);
 162
 163         saved_rgen_ctrl = NVReadRAMDAC(dev, 0, NV_PRAMDAC_GENERAL_CONTROL);
 164         NVWriteRAMDAC(dev, 0, NV_PRAMDAC_GENERAL_CONTROL,
 165                       (saved_rgen_ctrl & ~(NV_PRAMDAC_GENERAL_CONTROL_BPC_8BITS |
 166                                            NV_PRAMDAC_GENERAL_CONTROL_TERMINATION_75OHM)) |
 167                       NV_PRAMDAC_GENERAL_CONTROL_PIXMIX_ON);
 168
 169         blue = 8;       /* start of test range */
 170
 171         do {
 172                 bool sense_pair[2];
 173
 174                 nv_wr08(dev, NV_PRMDIO_WRITE_MODE_ADDRESS, 0);
 175                 nv_wr08(dev, NV_PRMDIO_PALETTE_DATA, 0);
 176                 nv_wr08(dev, NV_PRMDIO_PALETTE_DATA, 0);
 177                 /* testing blue won't find monochrome monitors.  I don't care */
 178                 nv_wr08(dev, NV_PRMDIO_PALETTE_DATA, blue);
 179
 180                 i = 0;
 181                 /* take sample pairs until both samples in the pair agree */
 182                 do {
 183                         if (sample_load_twice(dev, sense_pair))
 184                                 goto out;
 185                 } while ((sense_pair[0] != sense_pair[1]) &&
 186                                                         ++i < MAX_SAMPLE_PAIRS);
 187
 188                 if (i == MAX_SAMPLE_PAIRS)
 189                         /* too much oscillation defaults to LO */
 190                         sense = false;
 191                 else
 192                         sense = sense_pair[0];
 193
 194         /*
 195          * if sense goes LO before blue ramps to 0x18, monitor is not connected.
 196          * ergo, if blue gets to 0x18, monitor must be connected
 197          */
 198         } while (++blue < 0x18 && sense);
 199
 200 out:
 201         nv_wr08(dev, NV_PRMDIO_PIXEL_MASK, saved_palette_mask);
 202         NVWriteRAMDAC(dev, 0, NV_PRAMDAC_GENERAL_CONTROL, saved_rgen_ctrl);
 203         nv_wr08(dev, NV_PRMDIO_WRITE_MODE_ADDRESS, 0);
 204         for (i = 0; i < 3; i++)
 205                 nv_wr08(dev, NV_PRMDIO_PALETTE_DATA, saved_palette0[i]);
 206         NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL, saved_rtest_ctrl);
 207         NVWriteVgaCrtc(dev, 0, NV_CIO_CRE_PIXEL_INDEX, saved_pi);
 208         NVWriteVgaCrtc(dev, 0, NV_CIO_CRE_RPC1_INDEX, saved_rpc1);
 209         NVWriteVgaSeq(dev, 0, NV_VIO_SR_CLOCK_INDEX, saved_seq1);
 210         NVWriteVgaCrtc(dev, 0, NV_CIO_CR_MODE_INDEX, saved_cr_mode);
 211
 212         if (blue == 0x18) {
 213                 NV_INFO(dev, "Load detected on head A\n");
 214                 return connector_status_connected;
 215         }
 216
 217         return connector_status_disconnected;
 218 }
 219
 220 uint32_t nv17_dac_sample_load(struct drm_encoder *encoder)
 221 {
 222         struct drm_device *dev = encoder->dev;
 223         struct drm_nouveau_private *dev_priv = dev->dev_private;
 224         struct dcb_entry *dcb = nouveau_encoder(encoder)->dcb;
 225         uint32_t sample, testval, regoffset = nv04_dac_output_offset(encoder);
 226         uint32_t saved_powerctrl_2 = 0, saved_powerctrl_4 = 0, saved_routput,
 227                 saved_rtest_ctrl, saved_gpio0, saved_gpio1, temp, routput;
 228         int head;
 229
 230 #define RGB_TEST_DATA(r, g, b) (r << 0 | g << 10 | b << 20)
 231         if (dcb->type == OUTPUT_TV) {
 232                 testval = RGB_TEST_DATA(0xa0, 0xa0, 0xa0);
 233
 234                 if (dev_priv->vbios.tvdactestval)
 235                         testval = dev_priv->vbios.tvdactestval;
 236         } else {
 237                 testval = RGB_TEST_DATA(0x140, 0x140, 0x140); /* 0x94050140 */
 238
 239                 if (dev_priv->vbios.dactestval)
 240                         testval = dev_priv->vbios.dactestval;
 241         }
 242
 243         saved_rtest_ctrl = NVReadRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + regoffset);
 244         NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + regoffset,
 245                       saved_rtest_ctrl & ~NV_PRAMDAC_TEST_CONTROL_PWRDWN_DAC_OFF);
 246
 247         saved_powerctrl_2 = nvReadMC(dev, NV_PBUS_POWERCTRL_2);
 248
 249         nvWriteMC(dev, NV_PBUS_POWERCTRL_2, saved_powerctrl_2 & 0xd7ffffff);
 250         if (regoffset == 0x68) {
 251                 saved_powerctrl_4 = nvReadMC(dev, NV_PBUS_POWERCTRL_4);
 252                 nvWriteMC(dev, NV_PBUS_POWERCTRL_4, saved_powerctrl_4 & 0xffffffcf);
 253         }
 254
 255         saved_gpio1 = nouveau_gpio_func_get(dev, DCB_GPIO_TVDAC1);
 256         saved_gpio0 = nouveau_gpio_func_get(dev, DCB_GPIO_TVDAC0);
 257
 258         nouveau_gpio_func_set(dev, DCB_GPIO_TVDAC1, dcb->type == OUTPUT_TV);
 259         nouveau_gpio_func_set(dev, DCB_GPIO_TVDAC0, dcb->type == OUTPUT_TV);
 260
 261         msleep(4);
 262
 263         saved_routput = NVReadRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + regoffset);
 264         head = (saved_routput & 0x100) >> 8;
 265
 266         /* if there's a spare crtc, using it will minimise flicker */
 267         if (!(NVReadVgaCrtc(dev, head, NV_CIO_CRE_RPC1_INDEX) & 0xC0))
 268                 head ^= 1;
 269
 270         /* nv driver and nv31 use 0xfffffeee, nv34 and 6600 use 0xfffffece */
 271         routput = (saved_routput & 0xfffffece) | head << 8;
 272
 273         if (dev_priv->card_type >= NV_40) {
 274                 if (dcb->type == OUTPUT_TV)
 275                         routput |= 0x1a << 16;
 276                 else
 277                         routput &= ~(0x1a << 16);
 278         }
 279
 280         NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + regoffset, routput);
 281         msleep(1);
 282
 283         temp = NVReadRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + regoffset);
 284         NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + regoffset, temp | 1);
 285
 286         NVWriteRAMDAC(dev, head, NV_PRAMDAC_TESTPOINT_DATA,
 287                       NV_PRAMDAC_TESTPOINT_DATA_NOTBLANK | testval);
 288         temp = NVReadRAMDAC(dev, head, NV_PRAMDAC_TEST_CONTROL);
 289         NVWriteRAMDAC(dev, head, NV_PRAMDAC_TEST_CONTROL,
 290                       temp | NV_PRAMDAC_TEST_CONTROL_TP_INS_EN_ASSERTED);
 291         msleep(5);
 292
 293         sample = NVReadRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + regoffset);
 294         /* do it again just in case it's a residual current */
 295         sample &= NVReadRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + regoffset);
 296
 297         temp = NVReadRAMDAC(dev, head, NV_PRAMDAC_TEST_CONTROL);
 298         NVWriteRAMDAC(dev, head, NV_PRAMDAC_TEST_CONTROL,
 299                       temp & ~NV_PRAMDAC_TEST_CONTROL_TP_INS_EN_ASSERTED);
 300         NVWriteRAMDAC(dev, head, NV_PRAMDAC_TESTPOINT_DATA, 0);
 301
 302         /* bios does something more complex for restoring, but I think this is good enough */
 303         NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + regoffset, saved_routput);
 304         NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + regoffset, saved_rtest_ctrl);
 305         if (regoffset == 0x68)
 306                 nvWriteMC(dev, NV_PBUS_POWERCTRL_4, saved_powerctrl_4);
 307         nvWriteMC(dev, NV_PBUS_POWERCTRL_2, saved_powerctrl_2);
 308
 309         nouveau_gpio_func_set(dev, DCB_GPIO_TVDAC1, saved_gpio1);
 310         nouveau_gpio_func_set(dev, DCB_GPIO_TVDAC0, saved_gpio0);
 311
 312         return sample;
 313 }
 314
 315 static enum drm_connector_status
 316 nv17_dac_detect(struct drm_encoder *encoder, struct drm_connector *connector)
 317 {
 318         struct drm_device *dev = encoder->dev;
 319         struct dcb_entry *dcb = nouveau_encoder(encoder)->dcb;
 320
 321         if (nv04_dac_in_use(encoder))
 322                 return connector_status_disconnected;
 323
 324         if (nv17_dac_sample_load(encoder) &
 325             NV_PRAMDAC_TEST_CONTROL_SENSEB_ALLHI) {
 326                 NV_INFO(dev, "Load detected on output %c\n",
 327                         '@' + ffs(dcb->or));
 328                 return connector_status_connected;
 329         } else {
 330                 return connector_status_disconnected;
 331         }
 332 }
 333
 334 static bool nv04_dac_mode_fixup(struct drm_encoder *encoder,
 335                                 const struct drm_display_mode *mode,
 336                                 struct drm_display_mode *adjusted_mode)
 337 {
 338         if (nv04_dac_in_use(encoder))
 339                 return false;
 340
 341         return true;
 342 }
 343
 344 static void nv04_dac_prepare(struct drm_encoder *encoder)
 345 {
 346         struct drm_encoder_helper_funcs *helper = encoder->helper_private;
 347         struct drm_device *dev = encoder->dev;
 348         int head = nouveau_crtc(encoder->crtc)->index;
 349
 350         helper->dpms(encoder, DRM_MODE_DPMS_OFF);
 351
 352         nv04_dfp_disable(dev, head);
 353 }
 354
 355 static void nv04_dac_mode_set(struct drm_encoder *encoder,
 356                               struct drm_display_mode *mode,
 357                               struct drm_display_mode *adjusted_mode)
 358 {
 359         struct drm_device *dev = encoder->dev;
 360         struct drm_nouveau_private *dev_priv = dev->dev_private;
 361         int head = nouveau_crtc(encoder->crtc)->index;
 362
 363         if (nv_gf4_disp_arch(dev)) {
 364                 struct drm_encoder *rebind;
 365                 uint32_t dac_offset = nv04_dac_output_offset(encoder);
 366                 uint32_t otherdac;
 367
 368                 /* bit 16-19 are bits that are set on some G70 cards,
 369                  * but don't seem to have much effect */
 370                 NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + dac_offset,
 371                               head << 8 | NV_PRAMDAC_DACCLK_SEL_DACCLK);
 372                 /* force any other vga encoders to bind to the other crtc */
 373                 list_for_each_entry(rebind, &dev->mode_config.encoder_list, head) {
 374                         if (rebind == encoder
 375                             || nouveau_encoder(rebind)->dcb->type != OUTPUT_ANALOG)
 376                                 continue;
 377
 378                         dac_offset = nv04_dac_output_offset(rebind);
 379                         otherdac = NVReadRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + dac_offset);
 380                         NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + dac_offset,
 381                                       (otherdac & ~0x0100) | (head ^ 1) << 8);
 382                 }
 383         }
 384
 385         /* This could use refinement for flatpanels, but it should work this way */
 386         if (dev_priv->chipset < 0x44)
 387                 NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + nv04_dac_output_offset(encoder), 0xf0000000);
 388         else
 389                 NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + nv04_dac_output_offset(encoder), 0x00100000);
 390 }
 391
 392 static void nv04_dac_commit(struct drm_encoder *encoder)
 393 {
 394         struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
 395         struct drm_device *dev = encoder->dev;
 396         struct nouveau_crtc *nv_crtc = nouveau_crtc(encoder->crtc);
 397         struct drm_encoder_helper_funcs *helper = encoder->helper_private;
 398
 399         helper->dpms(encoder, DRM_MODE_DPMS_ON);
 400
 401         NV_INFO(dev, "Output %s is running on CRTC %d using output %c\n",
 402                 drm_get_connector_name(&nouveau_encoder_connector_get(nv_encoder)->base),
 403                 nv_crtc->index, '@' + ffs(nv_encoder->dcb->or));
 404 }
 405
 406 void nv04_dac_update_dacclk(struct drm_encoder *encoder, bool enable)
 407 {
 408         struct drm_device *dev = encoder->dev;
 409         struct drm_nouveau_private *dev_priv = dev->dev_private;
 410         struct dcb_entry *dcb = nouveau_encoder(encoder)->dcb;
 411
 412         if (nv_gf4_disp_arch(dev)) {
 413                 uint32_t *dac_users = &dev_priv->dac_users[ffs(dcb->or) - 1];
 414                 int dacclk_off = NV_PRAMDAC_DACCLK + nv04_dac_output_offset(encoder);
 415                 uint32_t dacclk = NVReadRAMDAC(dev, 0, dacclk_off);
 416
 417                 if (enable) {
 418                         *dac_users |= 1 << dcb->index;
 419                         NVWriteRAMDAC(dev, 0, dacclk_off, dacclk | NV_PRAMDAC_DACCLK_SEL_DACCLK);
 420
 421                 } else {
 422                         *dac_users &= ~(1 << dcb->index);
 423                         if (!*dac_users)
 424                                 NVWriteRAMDAC(dev, 0, dacclk_off,
 425                                         dacclk & ~NV_PRAMDAC_DACCLK_SEL_DACCLK);
 426                 }
 427         }
 428 }
 429
 430 /* Check if the DAC corresponding to 'encoder' is being used by
 431  * someone else. */
 432 bool nv04_dac_in_use(struct drm_encoder *encoder)
 433 {
 434         struct drm_nouveau_private *dev_priv = encoder->dev->dev_private;
 435         struct dcb_entry *dcb = nouveau_encoder(encoder)->dcb;
 436
 437         return nv_gf4_disp_arch(encoder->dev) &&
 438                 (dev_priv->dac_users[ffs(dcb->or) - 1] & ~(1 << dcb->index));
 439 }
 440
 441 static void nv04_dac_dpms(struct drm_encoder *encoder, int mode)
 442 {
 443         struct drm_device *dev = encoder->dev;
 444         struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
 445
 446         if (nv_encoder->last_dpms == mode)
 447                 return;
 448         nv_encoder->last_dpms = mode;
 449
 450         NV_INFO(dev, "Setting dpms mode %d on vga encoder (output %d)\n",
 451                      mode, nv_encoder->dcb->index);
 452
 453         nv04_dac_update_dacclk(encoder, mode == DRM_MODE_DPMS_ON);
 454 }
 455
 456 static void nv04_dac_save(struct drm_encoder *encoder)
 457 {
 458         struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
 459         struct drm_device *dev = encoder->dev;
 460
 461         if (nv_gf4_disp_arch(dev))
 462                 nv_encoder->restore.output = NVReadRAMDAC(dev, 0, NV_PRAMDAC_DACCLK +
 463                                                           nv04_dac_output_offset(encoder));
 464 }
 465
 466 static void nv04_dac_restore(struct drm_encoder *encoder)
 467 {
 468         struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
 469         struct drm_device *dev = encoder->dev;
 470
 471         if (nv_gf4_disp_arch(dev))
 472                 NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + nv04_dac_output_offset(encoder),
 473                               nv_encoder->restore.output);
 474
 475         nv_encoder->last_dpms = NV_DPMS_CLEARED;
 476 }
 477
 478 static void nv04_dac_destroy(struct drm_encoder *encoder)
 479 {
 480         struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
 481
 482         NV_DEBUG_KMS(encoder->dev, "\n");
 483
 484         drm_encoder_cleanup(encoder);
 485         kfree(nv_encoder);
 486 }
 487
 488 static const struct drm_encoder_helper_funcs nv04_dac_helper_funcs = {
 489         .dpms = nv04_dac_dpms,
 490         .save = nv04_dac_save,
 491         .restore = nv04_dac_restore,
 492         .mode_fixup = nv04_dac_mode_fixup,
 493         .prepare = nv04_dac_prepare,
 494         .commit = nv04_dac_commit,
 495         .mode_set = nv04_dac_mode_set,
 496         .detect = nv04_dac_detect
 497 };
 498
 499 static const struct drm_encoder_helper_funcs nv17_dac_helper_funcs = {
 500         .dpms = nv04_dac_dpms,
 501         .save = nv04_dac_save,
 502         .restore = nv04_dac_restore,
 503         .mode_fixup = nv04_dac_mode_fixup,
 504         .prepare = nv04_dac_prepare,
 505         .commit = nv04_dac_commit,
 506         .mode_set = nv04_dac_mode_set,
 507         .detect = nv17_dac_detect
 508 };
 509
 510 static const struct drm_encoder_funcs nv04_dac_funcs = {
 511         .destroy = nv04_dac_destroy,
 512 };
 513
 514 int
 515 nv04_dac_create(struct drm_connector *connector, struct dcb_entry *entry)
 516 {
 517         const struct drm_encoder_helper_funcs *helper;
 518         struct nouveau_encoder *nv_encoder = NULL;
 519         struct drm_device *dev = connector->dev;
 520         struct drm_encoder *encoder;
 521
 522         nv_encoder = kzalloc(sizeof(*nv_encoder), GFP_KERNEL);
 523         if (!nv_encoder)
 524                 return -ENOMEM;
 525
 526         encoder = to_drm_encoder(nv_encoder);
 527
 528         nv_encoder->dcb = entry;
 529         nv_encoder->or = ffs(entry->or) - 1;
 530
 531         if (nv_gf4_disp_arch(dev))
 532                 helper = &nv17_dac_helper_funcs;
 533         else
 534                 helper = &nv04_dac_helper_funcs;
 535
 536         drm_encoder_init(dev, encoder, &nv04_dac_funcs, DRM_MODE_ENCODER_DAC);
 537         drm_encoder_helper_add(encoder, helper);
 538
 539         encoder->possible_crtcs = entry->heads;
 540         encoder->possible_clones = 0;
 541
 542         drm_mode_connector_attach_encoder(connector, encoder);
 543         return 0;
 544 }