drivers/gpu/drm/i915/intel_crt.c

   1 /*
   2  * Copyright © 2006-2007 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *      Eric Anholt <eric@anholt.net>
  25  */
  26
  27 #include <linux/dmi.h>
  28 #include <linux/i2c.h>
  29 #include <linux/slab.h>
  30 #include <drm/drmP.h>
  31 #include <drm/drm_crtc.h>
  32 #include <drm/drm_crtc_helper.h>
  33 #include <drm/drm_edid.h>
  34 #include "intel_drv.h"
  35 #include <drm/i915_drm.h>
  36 #include "i915_drv.h"
  37
  38 /* Here's the desired hotplug mode */
  39 #define ADPA_HOTPLUG_BITS (ADPA_CRT_HOTPLUG_PERIOD_128 |                \
  40                            ADPA_CRT_HOTPLUG_WARMUP_10MS |               \
  41                            ADPA_CRT_HOTPLUG_SAMPLE_4S |                 \
  42                            ADPA_CRT_HOTPLUG_VOLTAGE_50 |                \
  43                            ADPA_CRT_HOTPLUG_VOLREF_325MV |              \
  44                            ADPA_CRT_HOTPLUG_ENABLE)
  45
  46 struct intel_crt {
  47         struct intel_encoder base;
  48         bool force_hotplug_required;
  49 };
  50
  51 static struct intel_crt *intel_attached_crt(struct drm_connector *connector)
  52 {
  53         return container_of(intel_attached_encoder(connector),
  54                             struct intel_crt, base);
  55 }
  56
  57 static void pch_crt_dpms(struct drm_encoder *encoder, int mode)
  58 {
  59         struct drm_device *dev = encoder->dev;
  60         struct drm_i915_private *dev_priv = dev->dev_private;
  61         u32 temp;
  62
  63         temp = I915_READ(PCH_ADPA);
  64         temp &= ~ADPA_DAC_ENABLE;
  65
  66         switch (mode) {
  67         case DRM_MODE_DPMS_ON:
  68                 temp |= ADPA_DAC_ENABLE;
  69                 break;
  70         case DRM_MODE_DPMS_STANDBY:
  71         case DRM_MODE_DPMS_SUSPEND:
  72         case DRM_MODE_DPMS_OFF:
  73                 /* Just leave port enable cleared */
  74                 break;
  75         }
  76
  77         I915_WRITE(PCH_ADPA, temp);
  78 }
  79
  80 static void gmch_crt_dpms(struct drm_encoder *encoder, int mode)
  81 {
  82         struct drm_device *dev = encoder->dev;
  83         struct drm_i915_private *dev_priv = dev->dev_private;
  84         u32 temp;
  85
  86         temp = I915_READ(ADPA);
  87         temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
  88         temp &= ~ADPA_DAC_ENABLE;
  89
  90         if (IS_VALLEYVIEW(dev) && mode != DRM_MODE_DPMS_ON)
  91                 mode = DRM_MODE_DPMS_OFF;
  92
  93         switch (mode) {
  94         case DRM_MODE_DPMS_ON:
  95                 temp |= ADPA_DAC_ENABLE;
  96                 break;
  97         case DRM_MODE_DPMS_STANDBY:
  98                 temp |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE;
  99                 break;
 100         case DRM_MODE_DPMS_SUSPEND:
 101                 temp |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE;
 102                 break;
 103         case DRM_MODE_DPMS_OFF:
 104                 temp |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE;
 105                 break;
 106         }
 107
 108         I915_WRITE(ADPA, temp);
 109 }
 110
 111 static int intel_crt_mode_valid(struct drm_connector *connector,
 112                                 struct drm_display_mode *mode)
 113 {
 114         struct drm_device *dev = connector->dev;
 115
 116         int max_clock = 0;
 117         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 118                 return MODE_NO_DBLESCAN;
 119
 120         if (mode->clock < 25000)
 121                 return MODE_CLOCK_LOW;
 122
 123         if (IS_GEN2(dev))
 124                 max_clock = 350000;
 125         else
 126                 max_clock = 400000;
 127         if (mode->clock > max_clock)
 128                 return MODE_CLOCK_HIGH;
 129
 130         return MODE_OK;
 131 }
 132
 133 static bool intel_crt_mode_fixup(struct drm_encoder *encoder,
 134                                  const struct drm_display_mode *mode,
 135                                  struct drm_display_mode *adjusted_mode)
 136 {
 137         return true;
 138 }
 139
 140 static void intel_crt_mode_set(struct drm_encoder *encoder,
 141                                struct drm_display_mode *mode,
 142                                struct drm_display_mode *adjusted_mode)
 143 {
 144
 145         struct drm_device *dev = encoder->dev;
 146         struct drm_crtc *crtc = encoder->crtc;
 147         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 148         struct drm_i915_private *dev_priv = dev->dev_private;
 149         int dpll_md_reg;
 150         u32 adpa, dpll_md;
 151         u32 adpa_reg;
 152
 153         dpll_md_reg = DPLL_MD(intel_crtc->pipe);
 154
 155         if (HAS_PCH_SPLIT(dev))
 156                 adpa_reg = PCH_ADPA;
 157         else
 158                 adpa_reg = ADPA;
 159
 160         /*
 161          * Disable separate mode multiplier used when cloning SDVO to CRT
 162          * XXX this needs to be adjusted when we really are cloning
 163          */
 164         if (INTEL_INFO(dev)->gen >= 4 && !HAS_PCH_SPLIT(dev)) {
 165                 dpll_md = I915_READ(dpll_md_reg);
 166                 I915_WRITE(dpll_md_reg,
 167                            dpll_md & ~DPLL_MD_UDI_MULTIPLIER_MASK);
 168         }
 169
 170         adpa = ADPA_HOTPLUG_BITS;
 171         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 172                 adpa |= ADPA_HSYNC_ACTIVE_HIGH;
 173         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 174                 adpa |= ADPA_VSYNC_ACTIVE_HIGH;
 175
 176         /* For CPT allow 3 pipe config, for others just use A or B */
 177         if (HAS_PCH_CPT(dev))
 178                 adpa |= PORT_TRANS_SEL_CPT(intel_crtc->pipe);
 179         else if (intel_crtc->pipe == 0)
 180                 adpa |= ADPA_PIPE_A_SELECT;
 181         else
 182                 adpa |= ADPA_PIPE_B_SELECT;
 183
 184         if (!HAS_PCH_SPLIT(dev))
 185                 I915_WRITE(BCLRPAT(intel_crtc->pipe), 0);
 186
 187         I915_WRITE(adpa_reg, adpa);
 188 }
 189
 190 static bool intel_ironlake_crt_detect_hotplug(struct drm_connector *connector)
 191 {
 192         struct drm_device *dev = connector->dev;
 193         struct intel_crt *crt = intel_attached_crt(connector);
 194         struct drm_i915_private *dev_priv = dev->dev_private;
 195         u32 adpa;
 196         bool ret;
 197
 198         /* The first time through, trigger an explicit detection cycle */
 199         if (crt->force_hotplug_required) {
 200                 bool turn_off_dac = HAS_PCH_SPLIT(dev);
 201                 u32 save_adpa;
 202
 203                 crt->force_hotplug_required = 0;
 204
 205                 save_adpa = adpa = I915_READ(PCH_ADPA);
 206                 DRM_DEBUG_KMS("trigger hotplug detect cycle: adpa=0x%x\n", adpa);
 207
 208                 adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
 209                 if (turn_off_dac)
 210                         adpa &= ~ADPA_DAC_ENABLE;
 211
 212                 I915_WRITE(PCH_ADPA, adpa);
 213
 214                 if (wait_for((I915_READ(PCH_ADPA) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) == 0,
 215                              1000))
 216                         DRM_DEBUG_KMS("timed out waiting for FORCE_TRIGGER");
 217
 218                 if (turn_off_dac) {
 219                         I915_WRITE(PCH_ADPA, save_adpa);
 220                         POSTING_READ(PCH_ADPA);
 221                 }
 222         }
 223
 224         /* Check the status to see if both blue and green are on now */
 225         adpa = I915_READ(PCH_ADPA);
 226         if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
 227                 ret = true;
 228         else
 229                 ret = false;
 230         DRM_DEBUG_KMS("ironlake hotplug adpa=0x%x, result %d\n", adpa, ret);
 231
 232         return ret;
 233 }
 234
 235 static bool valleyview_crt_detect_hotplug(struct drm_connector *connector)
 236 {
 237         struct drm_device *dev = connector->dev;
 238         struct drm_i915_private *dev_priv = dev->dev_private;
 239         u32 adpa;
 240         bool ret;
 241         u32 save_adpa;
 242
 243         save_adpa = adpa = I915_READ(ADPA);
 244         DRM_DEBUG_KMS("trigger hotplug detect cycle: adpa=0x%x\n", adpa);
 245
 246         adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
 247
 248         I915_WRITE(ADPA, adpa);
 249
 250         if (wait_for((I915_READ(ADPA) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) == 0,
 251                      1000)) {
 252                 DRM_DEBUG_KMS("timed out waiting for FORCE_TRIGGER");
 253                 I915_WRITE(ADPA, save_adpa);
 254         }
 255
 256         /* Check the status to see if both blue and green are on now */
 257         adpa = I915_READ(ADPA);
 258         if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
 259                 ret = true;
 260         else
 261                 ret = false;
 262
 263         DRM_DEBUG_KMS("valleyview hotplug adpa=0x%x, result %d\n", adpa, ret);
 264
 265         /* FIXME: debug force function and remove */
 266         ret = true;
 267
 268         return ret;
 269 }
 270
 271 /**
 272  * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect CRT presence.
 273  *
 274  * Not for i915G/i915GM
 275  *
 276  * \return true if CRT is connected.
 277  * \return false if CRT is disconnected.
 278  */
 279 static bool intel_crt_detect_hotplug(struct drm_connector *connector)
 280 {
 281         struct drm_device *dev = connector->dev;
 282         struct drm_i915_private *dev_priv = dev->dev_private;
 283         u32 hotplug_en, orig, stat;
 284         bool ret = false;
 285         int i, tries = 0;
 286
 287         if (HAS_PCH_SPLIT(dev))
 288                 return intel_ironlake_crt_detect_hotplug(connector);
 289
 290         if (IS_VALLEYVIEW(dev))
 291                 return valleyview_crt_detect_hotplug(connector);
 292
 293         /*
 294          * On 4 series desktop, CRT detect sequence need to be done twice
 295          * to get a reliable result.
 296          */
 297
 298         if (IS_G4X(dev) && !IS_GM45(dev))
 299                 tries = 2;
 300         else
 301                 tries = 1;
 302         hotplug_en = orig = I915_READ(PORT_HOTPLUG_EN);
 303         hotplug_en |= CRT_HOTPLUG_FORCE_DETECT;
 304
 305         for (i = 0; i < tries ; i++) {
 306                 /* turn on the FORCE_DETECT */
 307                 I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);
 308                 /* wait for FORCE_DETECT to go off */
 309                 if (wait_for((I915_READ(PORT_HOTPLUG_EN) &
 310                               CRT_HOTPLUG_FORCE_DETECT) == 0,
 311                              1000))
 312                         DRM_DEBUG_KMS("timed out waiting for FORCE_DETECT to go off");
 313         }
 314
 315         stat = I915_READ(PORT_HOTPLUG_STAT);
 316         if ((stat & CRT_HOTPLUG_MONITOR_MASK) != CRT_HOTPLUG_MONITOR_NONE)
 317                 ret = true;
 318
 319         /* clear the interrupt we just generated, if any */
 320         I915_WRITE(PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS);
 321
 322         /* and put the bits back */
 323         I915_WRITE(PORT_HOTPLUG_EN, orig);
 324
 325         return ret;
 326 }
 327
 328 static struct edid *intel_crt_get_edid(struct drm_connector *connector,
 329                                 struct i2c_adapter *i2c)
 330 {
 331         struct edid *edid;
 332
 333         edid = drm_get_edid(connector, i2c);
 334
 335         if (!edid && !intel_gmbus_is_forced_bit(i2c)) {
 336                 DRM_DEBUG_KMS("CRT GMBUS EDID read failed, retry using GPIO bit-banging\n");
 337                 intel_gmbus_force_bit(i2c, true);
 338                 edid = drm_get_edid(connector, i2c);
 339                 intel_gmbus_force_bit(i2c, false);
 340         }
 341
 342         return edid;
 343 }
 344
 345 /* local version of intel_ddc_get_modes() to use intel_crt_get_edid() */
 346 static int intel_crt_ddc_get_modes(struct drm_connector *connector,
 347                                 struct i2c_adapter *adapter)
 348 {
 349         struct edid *edid;
 350
 351         edid = intel_crt_get_edid(connector, adapter);
 352         if (!edid)
 353                 return 0;
 354
 355         return intel_connector_update_modes(connector, edid);
 356 }
 357
 358 static bool intel_crt_detect_ddc(struct drm_connector *connector)
 359 {
 360         struct intel_crt *crt = intel_attached_crt(connector);
 361         struct drm_i915_private *dev_priv = crt->base.base.dev->dev_private;
 362         struct edid *edid;
 363         struct i2c_adapter *i2c;
 364
 365         BUG_ON(crt->base.type != INTEL_OUTPUT_ANALOG);
 366
 367         i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->crt_ddc_pin);
 368         edid = intel_crt_get_edid(connector, i2c);
 369
 370         if (edid) {
 371                 bool is_digital = edid->input & DRM_EDID_INPUT_DIGITAL;
 372
 373                 /*
 374                  * This may be a DVI-I connector with a shared DDC
 375                  * link between analog and digital outputs, so we
 376                  * have to check the EDID input spec of the attached device.
 377                  */
 378                 if (!is_digital) {
 379                         DRM_DEBUG_KMS("CRT detected via DDC:0x50 [EDID]\n");
 380                         return true;
 381                 }
 382
 383                 DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [EDID reports a digital panel]\n");
 384         } else {
 385                 DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [no valid EDID found]\n");
 386         }
 387
 388         kfree(edid);
 389
 390         return false;
 391 }
 392
 393 static enum drm_connector_status
 394 intel_crt_load_detect(struct intel_crt *crt)
 395 {
 396         struct drm_device *dev = crt->base.base.dev;
 397         struct drm_i915_private *dev_priv = dev->dev_private;
 398         uint32_t pipe = to_intel_crtc(crt->base.base.crtc)->pipe;
 399         uint32_t save_bclrpat;
 400         uint32_t save_vtotal;
 401         uint32_t vtotal, vactive;
 402         uint32_t vsample;
 403         uint32_t vblank, vblank_start, vblank_end;
 404         uint32_t dsl;
 405         uint32_t bclrpat_reg;
 406         uint32_t vtotal_reg;
 407         uint32_t vblank_reg;
 408         uint32_t vsync_reg;
 409         uint32_t pipeconf_reg;
 410         uint32_t pipe_dsl_reg;
 411         uint8_t st00;
 412         enum drm_connector_status status;
 413
 414         DRM_DEBUG_KMS("starting load-detect on CRT\n");
 415
 416         bclrpat_reg = BCLRPAT(pipe);
 417         vtotal_reg = VTOTAL(pipe);
 418         vblank_reg = VBLANK(pipe);
 419         vsync_reg = VSYNC(pipe);
 420         pipeconf_reg = PIPECONF(pipe);
 421         pipe_dsl_reg = PIPEDSL(pipe);
 422
 423         save_bclrpat = I915_READ(bclrpat_reg);
 424         save_vtotal = I915_READ(vtotal_reg);
 425         vblank = I915_READ(vblank_reg);
 426
 427         vtotal = ((save_vtotal >> 16) & 0xfff) + 1;
 428         vactive = (save_vtotal & 0x7ff) + 1;
 429
 430         vblank_start = (vblank & 0xfff) + 1;
 431         vblank_end = ((vblank >> 16) & 0xfff) + 1;
 432
 433         /* Set the border color to purple. */
 434         I915_WRITE(bclrpat_reg, 0x500050);
 435
 436         if (!IS_GEN2(dev)) {
 437                 uint32_t pipeconf = I915_READ(pipeconf_reg);
 438                 I915_WRITE(pipeconf_reg, pipeconf | PIPECONF_FORCE_BORDER);
 439                 POSTING_READ(pipeconf_reg);
 440                 /* Wait for next Vblank to substitue
 441                  * border color for Color info */
 442                 intel_wait_for_vblank(dev, pipe);
 443                 st00 = I915_READ8(VGA_MSR_WRITE);
 444                 status = ((st00 & (1 << 4)) != 0) ?
 445                         connector_status_connected :
 446                         connector_status_disconnected;
 447
 448                 I915_WRITE(pipeconf_reg, pipeconf);
 449         } else {
 450                 bool restore_vblank = false;
 451                 int count, detect;
 452
 453                 /*
 454                 * If there isn't any border, add some.
 455                 * Yes, this will flicker
 456                 */
 457                 if (vblank_start <= vactive && vblank_end >= vtotal) {
 458                         uint32_t vsync = I915_READ(vsync_reg);
 459                         uint32_t vsync_start = (vsync & 0xffff) + 1;
 460
 461                         vblank_start = vsync_start;
 462                         I915_WRITE(vblank_reg,
 463                                    (vblank_start - 1) |
 464                                    ((vblank_end - 1) << 16));
 465                         restore_vblank = true;
 466                 }
 467                 /* sample in the vertical border, selecting the larger one */
 468                 if (vblank_start - vactive >= vtotal - vblank_end)
 469                         vsample = (vblank_start + vactive) >> 1;
 470                 else
 471                         vsample = (vtotal + vblank_end) >> 1;
 472
 473                 /*
 474                  * Wait for the border to be displayed
 475                  */
 476                 while (I915_READ(pipe_dsl_reg) >= vactive)
 477                         ;
 478                 while ((dsl = I915_READ(pipe_dsl_reg)) <= vsample)
 479                         ;
 480                 /*
 481                  * Watch ST00 for an entire scanline
 482                  */
 483                 detect = 0;
 484                 count = 0;
 485                 do {
 486                         count++;
 487                         /* Read the ST00 VGA status register */
 488                         st00 = I915_READ8(VGA_MSR_WRITE);
 489                         if (st00 & (1 << 4))
 490                                 detect++;
 491                 } while ((I915_READ(pipe_dsl_reg) == dsl));
 492
 493                 /* restore vblank if necessary */
 494                 if (restore_vblank)
 495                         I915_WRITE(vblank_reg, vblank);
 496                 /*
 497                  * If more than 3/4 of the scanline detected a monitor,
 498                  * then it is assumed to be present. This works even on i830,
 499                  * where there isn't any way to force the border color across
 500                  * the screen
 501                  */
 502                 status = detect * 4 > count * 3 ?
 503                          connector_status_connected :
 504                          connector_status_disconnected;
 505         }
 506
 507         /* Restore previous settings */
 508         I915_WRITE(bclrpat_reg, save_bclrpat);
 509
 510         return status;
 511 }
 512
 513 static enum drm_connector_status
 514 intel_crt_detect(struct drm_connector *connector, bool force)
 515 {
 516         struct drm_device *dev = connector->dev;
 517         struct intel_crt *crt = intel_attached_crt(connector);
 518         enum drm_connector_status status;
 519         struct intel_load_detect_pipe tmp;
 520
 521         if (I915_HAS_HOTPLUG(dev)) {
 522                 /* We can not rely on the HPD pin always being correctly wired
 523                  * up, for example many KVM do not pass it through, and so
 524                  * only trust an assertion that the monitor is connected.
 525                  */
 526                 if (intel_crt_detect_hotplug(connector)) {
 527                         DRM_DEBUG_KMS("CRT detected via hotplug\n");
 528                         return connector_status_connected;
 529                 } else
 530                         DRM_DEBUG_KMS("CRT not detected via hotplug\n");
 531         }
 532
 533         if (intel_crt_detect_ddc(connector))
 534                 return connector_status_connected;
 535
 536         /* Load detection is broken on HPD capable machines. Whoever wants a
 537          * broken monitor (without edid) to work behind a broken kvm (that fails
 538          * to have the right resistors for HP detection) needs to fix this up.
 539          * For now just bail out. */
 540         if (I915_HAS_HOTPLUG(dev))
 541                 return connector_status_disconnected;
 542
 543         if (!force)
 544                 return connector->status;
 545
 546         /* for pre-945g platforms use load detect */
 547         if (intel_get_load_detect_pipe(&crt->base, connector, NULL,
 548                                        &tmp)) {
 549                 if (intel_crt_detect_ddc(connector))
 550                         status = connector_status_connected;
 551                 else
 552                         status = intel_crt_load_detect(crt);
 553                 intel_release_load_detect_pipe(&crt->base, connector,
 554                                                &tmp);
 555         } else
 556                 status = connector_status_unknown;
 557
 558         return status;
 559 }
 560
 561 static void intel_crt_destroy(struct drm_connector *connector)
 562 {
 563         drm_sysfs_connector_remove(connector);
 564         drm_connector_cleanup(connector);
 565         kfree(connector);
 566 }
 567
 568 static int intel_crt_get_modes(struct drm_connector *connector)
 569 {
 570         struct drm_device *dev = connector->dev;
 571         struct drm_i915_private *dev_priv = dev->dev_private;
 572         int ret;
 573         struct i2c_adapter *i2c;
 574
 575         i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->crt_ddc_pin);
 576         ret = intel_crt_ddc_get_modes(connector, i2c);
 577         if (ret || !IS_G4X(dev))
 578                 return ret;
 579
 580         /* Try to probe digital port for output in DVI-I -> VGA mode. */
 581         i2c = intel_gmbus_get_adapter(dev_priv, GMBUS_PORT_DPB);
 582         return intel_crt_ddc_get_modes(connector, i2c);
 583 }
 584
 585 static int intel_crt_set_property(struct drm_connector *connector,
 586                                   struct drm_property *property,
 587                                   uint64_t value)
 588 {
 589         return 0;
 590 }
 591
 592 static void intel_crt_reset(struct drm_connector *connector)
 593 {
 594         struct drm_device *dev = connector->dev;
 595         struct intel_crt *crt = intel_attached_crt(connector);
 596
 597         if (HAS_PCH_SPLIT(dev))
 598                 crt->force_hotplug_required = 1;
 599 }
 600
 601 /*
 602  * Routines for controlling stuff on the analog port
 603  */
 604
 605 static const struct drm_encoder_helper_funcs pch_encoder_funcs = {
 606         .mode_fixup = intel_crt_mode_fixup,
 607         .prepare = intel_encoder_prepare,
 608         .commit = intel_encoder_commit,
 609         .mode_set = intel_crt_mode_set,
 610         .dpms = pch_crt_dpms,
 611 };
 612
 613 static const struct drm_encoder_helper_funcs gmch_encoder_funcs = {
 614         .mode_fixup = intel_crt_mode_fixup,
 615         .prepare = intel_encoder_prepare,
 616         .commit = intel_encoder_commit,
 617         .mode_set = intel_crt_mode_set,
 618         .dpms = gmch_crt_dpms,
 619 };
 620
 621 static const struct drm_connector_funcs intel_crt_connector_funcs = {
 622         .reset = intel_crt_reset,
 623         .dpms = drm_helper_connector_dpms,
 624         .detect = intel_crt_detect,
 625         .fill_modes = drm_helper_probe_single_connector_modes,
 626         .destroy = intel_crt_destroy,
 627         .set_property = intel_crt_set_property,
 628 };
 629
 630 static const struct drm_connector_helper_funcs intel_crt_connector_helper_funcs = {
 631         .mode_valid = intel_crt_mode_valid,
 632         .get_modes = intel_crt_get_modes,
 633         .best_encoder = intel_best_encoder,
 634 };
 635
 636 static const struct drm_encoder_funcs intel_crt_enc_funcs = {
 637         .destroy = intel_encoder_destroy,
 638 };
 639
 640 static int __init intel_no_crt_dmi_callback(const struct dmi_system_id *id)
 641 {
 642         DRM_INFO("Skipping CRT initialization for %s\n", id->ident);
 643         return 1;
 644 }
 645
 646 static const struct dmi_system_id intel_no_crt[] = {
 647         {
 648                 .callback = intel_no_crt_dmi_callback,
 649                 .ident = "ACER ZGB",
 650                 .matches = {
 651                         DMI_MATCH(DMI_SYS_VENDOR, "ACER"),
 652                         DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
 653                 },
 654         },
 655         { }
 656 };
 657
 658 void intel_crt_init(struct drm_device *dev)
 659 {
 660         struct drm_connector *connector;
 661         struct intel_crt *crt;
 662         struct intel_connector *intel_connector;
 663         struct drm_i915_private *dev_priv = dev->dev_private;
 664         const struct drm_encoder_helper_funcs *encoder_helper_funcs;
 665
 666         /* Skip machines without VGA that falsely report hotplug events */
 667         if (dmi_check_system(intel_no_crt))
 668                 return;
 669
 670         crt = kzalloc(sizeof(struct intel_crt), GFP_KERNEL);
 671         if (!crt)
 672                 return;
 673
 674         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
 675         if (!intel_connector) {
 676                 kfree(crt);
 677                 return;
 678         }
 679
 680         connector = &intel_connector->base;
 681         drm_connector_init(dev, &intel_connector->base,
 682                            &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);
 683
 684         drm_encoder_init(dev, &crt->base.base, &intel_crt_enc_funcs,
 685                          DRM_MODE_ENCODER_DAC);
 686
 687         intel_connector_attach_encoder(intel_connector, &crt->base);
 688
 689         crt->base.type = INTEL_OUTPUT_ANALOG;
 690         crt->base.clone_mask = (1 << INTEL_SDVO_NON_TV_CLONE_BIT |
 691                                 1 << INTEL_ANALOG_CLONE_BIT |
 692                                 1 << INTEL_SDVO_LVDS_CLONE_BIT);
 693         if (IS_HASWELL(dev))
 694                 crt->base.crtc_mask = (1 << 0);
 695         else
 696                 crt->base.crtc_mask = (1 << 0) | (1 << 1);
 697
 698         if (IS_GEN2(dev))
 699                 connector->interlace_allowed = 0;
 700         else
 701                 connector->interlace_allowed = 1;
 702         connector->doublescan_allowed = 0;
 703
 704         if (HAS_PCH_SPLIT(dev))
 705                 encoder_helper_funcs = &pch_encoder_funcs;
 706         else
 707                 encoder_helper_funcs = &gmch_encoder_funcs;
 708
 709         drm_encoder_helper_add(&crt->base.base, encoder_helper_funcs);
 710         drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs);
 711
 712         drm_sysfs_connector_add(connector);
 713
 714         if (I915_HAS_HOTPLUG(dev))
 715                 connector->polled = DRM_CONNECTOR_POLL_HPD;
 716         else
 717                 connector->polled = DRM_CONNECTOR_POLL_CONNECT;
 718
 719         /*
 720          * Configure the automatic hotplug detection stuff
 721          */
 722         crt->force_hotplug_required = 0;
 723         if (HAS_PCH_SPLIT(dev)) {
 724                 u32 adpa;
 725
 726                 adpa = I915_READ(PCH_ADPA);
 727                 adpa &= ~ADPA_CRT_HOTPLUG_MASK;
 728                 adpa |= ADPA_HOTPLUG_BITS;
 729                 I915_WRITE(PCH_ADPA, adpa);
 730                 POSTING_READ(PCH_ADPA);
 731
 732                 DRM_DEBUG_KMS("pch crt adpa set to 0x%x\n", adpa);
 733                 crt->force_hotplug_required = 1;
 734         }
 735
 736         dev_priv->hotplug_supported_mask |= CRT_HOTPLUG_INT_STATUS;
 737 }