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         u32 adpa_reg;
  50 };
  51
  52 static struct intel_crt *intel_attached_crt(struct drm_connector *connector)
  53 {
  54         return container_of(intel_attached_encoder(connector),
  55                             struct intel_crt, base);
  56 }
  57
  58 static struct intel_crt *intel_encoder_to_crt(struct intel_encoder *encoder)
  59 {
  60         return container_of(encoder, struct intel_crt, base);
  61 }
  62
  63 static bool intel_crt_get_hw_state(struct intel_encoder *encoder,
  64                                    enum pipe *pipe)
  65 {
  66         struct drm_device *dev = encoder->base.dev;
  67         struct drm_i915_private *dev_priv = dev->dev_private;
  68         struct intel_crt *crt = intel_encoder_to_crt(encoder);
  69         u32 tmp;
  70
  71         tmp = I915_READ(crt->adpa_reg);
  72
  73         if (!(tmp & ADPA_DAC_ENABLE))
  74                 return false;
  75
  76         if (HAS_PCH_CPT(dev))
  77                 *pipe = PORT_TO_PIPE_CPT(tmp);
  78         else
  79                 *pipe = PORT_TO_PIPE(tmp);
  80
  81         return true;
  82 }
  83
  84 static void intel_disable_crt(struct intel_encoder *encoder)
  85 {
  86         struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
  87         struct intel_crt *crt = intel_encoder_to_crt(encoder);
  88         u32 temp;
  89
  90         temp = I915_READ(crt->adpa_reg);
  91         temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
  92         temp &= ~ADPA_DAC_ENABLE;
  93         I915_WRITE(crt->adpa_reg, temp);
  94 }
  95
  96 static void intel_enable_crt(struct intel_encoder *encoder)
  97 {
  98         struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
  99         struct intel_crt *crt = intel_encoder_to_crt(encoder);
 100         u32 temp;
 101
 102         temp = I915_READ(crt->adpa_reg);
 103         temp |= ADPA_DAC_ENABLE;
 104         I915_WRITE(crt->adpa_reg, temp);
 105 }
 106
 107 /* Note: The caller is required to filter out dpms modes not supported by the
 108  * platform. */
 109 static void intel_crt_set_dpms(struct intel_encoder *encoder, int mode)
 110 {
 111         struct drm_device *dev = encoder->base.dev;
 112         struct drm_i915_private *dev_priv = dev->dev_private;
 113         struct intel_crt *crt = intel_encoder_to_crt(encoder);
 114         u32 temp;
 115
 116         temp = I915_READ(crt->adpa_reg);
 117         temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
 118         temp &= ~ADPA_DAC_ENABLE;
 119
 120         switch (mode) {
 121         case DRM_MODE_DPMS_ON:
 122                 temp |= ADPA_DAC_ENABLE;
 123                 break;
 124         case DRM_MODE_DPMS_STANDBY:
 125                 temp |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE;
 126                 break;
 127         case DRM_MODE_DPMS_SUSPEND:
 128                 temp |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE;
 129                 break;
 130         case DRM_MODE_DPMS_OFF:
 131                 temp |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE;
 132                 break;
 133         }
 134
 135         I915_WRITE(crt->adpa_reg, temp);
 136 }
 137
 138 static void intel_crt_dpms(struct drm_connector *connector, int mode)
 139 {
 140         struct drm_device *dev = connector->dev;
 141         struct intel_encoder *encoder = intel_attached_encoder(connector);
 142         struct drm_crtc *crtc;
 143         int old_dpms;
 144
 145         /* PCH platforms and VLV only support on/off. */
 146         if (INTEL_INFO(dev)->gen < 5 && mode != DRM_MODE_DPMS_ON)
 147                 mode = DRM_MODE_DPMS_OFF;
 148
 149         if (mode == connector->dpms)
 150                 return;
 151
 152         old_dpms = connector->dpms;
 153         connector->dpms = mode;
 154
 155         /* Only need to change hw state when actually enabled */
 156         crtc = encoder->base.crtc;
 157         if (!crtc) {
 158                 encoder->connectors_active = false;
 159                 return;
 160         }
 161
 162         /* We need the pipe to run for anything but OFF. */
 163         if (mode == DRM_MODE_DPMS_OFF)
 164                 encoder->connectors_active = false;
 165         else
 166                 encoder->connectors_active = true;
 167
 168         if (mode < old_dpms) {
 169                 /* From off to on, enable the pipe first. */
 170                 intel_crtc_update_dpms(crtc);
 171
 172                 intel_crt_set_dpms(encoder, mode);
 173         } else {
 174                 intel_crt_set_dpms(encoder, mode);
 175
 176                 intel_crtc_update_dpms(crtc);
 177         }
 178
 179         intel_modeset_check_state(connector->dev);
 180 }
 181
 182 static int intel_crt_mode_valid(struct drm_connector *connector,
 183                                 struct drm_display_mode *mode)
 184 {
 185         struct drm_device *dev = connector->dev;
 186
 187         int max_clock = 0;
 188         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 189                 return MODE_NO_DBLESCAN;
 190
 191         if (mode->clock < 25000)
 192                 return MODE_CLOCK_LOW;
 193
 194         if (IS_GEN2(dev))
 195                 max_clock = 350000;
 196         else
 197                 max_clock = 400000;
 198         if (mode->clock > max_clock)
 199                 return MODE_CLOCK_HIGH;
 200
 201         return MODE_OK;
 202 }
 203
 204 static bool intel_crt_mode_fixup(struct drm_encoder *encoder,
 205                                  const struct drm_display_mode *mode,
 206                                  struct drm_display_mode *adjusted_mode)
 207 {
 208         return true;
 209 }
 210
 211 static void intel_crt_mode_set(struct drm_encoder *encoder,
 212                                struct drm_display_mode *mode,
 213                                struct drm_display_mode *adjusted_mode)
 214 {
 215
 216         struct drm_device *dev = encoder->dev;
 217         struct drm_crtc *crtc = encoder->crtc;
 218         struct intel_crt *crt =
 219                 intel_encoder_to_crt(to_intel_encoder(encoder));
 220         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 221         struct drm_i915_private *dev_priv = dev->dev_private;
 222         int dpll_md_reg;
 223         u32 adpa, dpll_md;
 224
 225         dpll_md_reg = DPLL_MD(intel_crtc->pipe);
 226
 227         /*
 228          * Disable separate mode multiplier used when cloning SDVO to CRT
 229          * XXX this needs to be adjusted when we really are cloning
 230          */
 231         if (INTEL_INFO(dev)->gen >= 4 && !HAS_PCH_SPLIT(dev)) {
 232                 dpll_md = I915_READ(dpll_md_reg);
 233                 I915_WRITE(dpll_md_reg,
 234                            dpll_md & ~DPLL_MD_UDI_MULTIPLIER_MASK);
 235         }
 236
 237         adpa = ADPA_HOTPLUG_BITS;
 238         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 239                 adpa |= ADPA_HSYNC_ACTIVE_HIGH;
 240         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 241                 adpa |= ADPA_VSYNC_ACTIVE_HIGH;
 242
 243         /* For CPT allow 3 pipe config, for others just use A or B */
 244         if (HAS_PCH_CPT(dev))
 245                 adpa |= PORT_TRANS_SEL_CPT(intel_crtc->pipe);
 246         else if (intel_crtc->pipe == 0)
 247                 adpa |= ADPA_PIPE_A_SELECT;
 248         else
 249                 adpa |= ADPA_PIPE_B_SELECT;
 250
 251         if (!HAS_PCH_SPLIT(dev))
 252                 I915_WRITE(BCLRPAT(intel_crtc->pipe), 0);
 253
 254         I915_WRITE(crt->adpa_reg, adpa);
 255 }
 256
 257 static bool intel_ironlake_crt_detect_hotplug(struct drm_connector *connector)
 258 {
 259         struct drm_device *dev = connector->dev;
 260         struct intel_crt *crt = intel_attached_crt(connector);
 261         struct drm_i915_private *dev_priv = dev->dev_private;
 262         u32 adpa;
 263         bool ret;
 264
 265         /* The first time through, trigger an explicit detection cycle */
 266         if (crt->force_hotplug_required) {
 267                 bool turn_off_dac = HAS_PCH_SPLIT(dev);
 268                 u32 save_adpa;
 269
 270                 crt->force_hotplug_required = 0;
 271
 272                 save_adpa = adpa = I915_READ(PCH_ADPA);
 273                 DRM_DEBUG_KMS("trigger hotplug detect cycle: adpa=0x%x\n", adpa);
 274
 275                 adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
 276                 if (turn_off_dac)
 277                         adpa &= ~ADPA_DAC_ENABLE;
 278
 279                 I915_WRITE(PCH_ADPA, adpa);
 280
 281                 if (wait_for((I915_READ(PCH_ADPA) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) == 0,
 282                              1000))
 283                         DRM_DEBUG_KMS("timed out waiting for FORCE_TRIGGER");
 284
 285                 if (turn_off_dac) {
 286                         I915_WRITE(PCH_ADPA, save_adpa);
 287                         POSTING_READ(PCH_ADPA);
 288                 }
 289         }
 290
 291         /* Check the status to see if both blue and green are on now */
 292         adpa = I915_READ(PCH_ADPA);
 293         if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
 294                 ret = true;
 295         else
 296                 ret = false;
 297         DRM_DEBUG_KMS("ironlake hotplug adpa=0x%x, result %d\n", adpa, ret);
 298
 299         return ret;
 300 }
 301
 302 static bool valleyview_crt_detect_hotplug(struct drm_connector *connector)
 303 {
 304         struct drm_device *dev = connector->dev;
 305         struct drm_i915_private *dev_priv = dev->dev_private;
 306         u32 adpa;
 307         bool ret;
 308         u32 save_adpa;
 309
 310         save_adpa = adpa = I915_READ(ADPA);
 311         DRM_DEBUG_KMS("trigger hotplug detect cycle: adpa=0x%x\n", adpa);
 312
 313         adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
 314
 315         I915_WRITE(ADPA, adpa);
 316
 317         if (wait_for((I915_READ(ADPA) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) == 0,
 318                      1000)) {
 319                 DRM_DEBUG_KMS("timed out waiting for FORCE_TRIGGER");
 320                 I915_WRITE(ADPA, save_adpa);
 321         }
 322
 323         /* Check the status to see if both blue and green are on now */
 324         adpa = I915_READ(ADPA);
 325         if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
 326                 ret = true;
 327         else
 328                 ret = false;
 329
 330         DRM_DEBUG_KMS("valleyview hotplug adpa=0x%x, result %d\n", adpa, ret);
 331
 332         /* FIXME: debug force function and remove */
 333         ret = true;
 334
 335         return ret;
 336 }
 337
 338 /**
 339  * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect CRT presence.
 340  *
 341  * Not for i915G/i915GM
 342  *
 343  * \return true if CRT is connected.
 344  * \return false if CRT is disconnected.
 345  */
 346 static bool intel_crt_detect_hotplug(struct drm_connector *connector)
 347 {
 348         struct drm_device *dev = connector->dev;
 349         struct drm_i915_private *dev_priv = dev->dev_private;
 350         u32 hotplug_en, orig, stat;
 351         bool ret = false;
 352         int i, tries = 0;
 353
 354         if (HAS_PCH_SPLIT(dev))
 355                 return intel_ironlake_crt_detect_hotplug(connector);
 356
 357         if (IS_VALLEYVIEW(dev))
 358                 return valleyview_crt_detect_hotplug(connector);
 359
 360         /*
 361          * On 4 series desktop, CRT detect sequence need to be done twice
 362          * to get a reliable result.
 363          */
 364
 365         if (IS_G4X(dev) && !IS_GM45(dev))
 366                 tries = 2;
 367         else
 368                 tries = 1;
 369         hotplug_en = orig = I915_READ(PORT_HOTPLUG_EN);
 370         hotplug_en |= CRT_HOTPLUG_FORCE_DETECT;
 371
 372         for (i = 0; i < tries ; i++) {
 373                 /* turn on the FORCE_DETECT */
 374                 I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);
 375                 /* wait for FORCE_DETECT to go off */
 376                 if (wait_for((I915_READ(PORT_HOTPLUG_EN) &
 377                               CRT_HOTPLUG_FORCE_DETECT) == 0,
 378                              1000))
 379                         DRM_DEBUG_KMS("timed out waiting for FORCE_DETECT to go off");
 380         }
 381
 382         stat = I915_READ(PORT_HOTPLUG_STAT);
 383         if ((stat & CRT_HOTPLUG_MONITOR_MASK) != CRT_HOTPLUG_MONITOR_NONE)
 384                 ret = true;
 385
 386         /* clear the interrupt we just generated, if any */
 387         I915_WRITE(PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS);
 388
 389         /* and put the bits back */
 390         I915_WRITE(PORT_HOTPLUG_EN, orig);
 391
 392         return ret;
 393 }
 394
 395 static struct edid *intel_crt_get_edid(struct drm_connector *connector,
 396                                 struct i2c_adapter *i2c)
 397 {
 398         struct edid *edid;
 399
 400         edid = drm_get_edid(connector, i2c);
 401
 402         if (!edid && !intel_gmbus_is_forced_bit(i2c)) {
 403                 DRM_DEBUG_KMS("CRT GMBUS EDID read failed, retry using GPIO bit-banging\n");
 404                 intel_gmbus_force_bit(i2c, true);
 405                 edid = drm_get_edid(connector, i2c);
 406                 intel_gmbus_force_bit(i2c, false);
 407         }
 408
 409         return edid;
 410 }
 411
 412 /* local version of intel_ddc_get_modes() to use intel_crt_get_edid() */
 413 static int intel_crt_ddc_get_modes(struct drm_connector *connector,
 414                                 struct i2c_adapter *adapter)
 415 {
 416         struct edid *edid;
 417
 418         edid = intel_crt_get_edid(connector, adapter);
 419         if (!edid)
 420                 return 0;
 421
 422         return intel_connector_update_modes(connector, edid);
 423 }
 424
 425 static bool intel_crt_detect_ddc(struct drm_connector *connector)
 426 {
 427         struct intel_crt *crt = intel_attached_crt(connector);
 428         struct drm_i915_private *dev_priv = crt->base.base.dev->dev_private;
 429         struct edid *edid;
 430         struct i2c_adapter *i2c;
 431
 432         BUG_ON(crt->base.type != INTEL_OUTPUT_ANALOG);
 433
 434         i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->crt_ddc_pin);
 435         edid = intel_crt_get_edid(connector, i2c);
 436
 437         if (edid) {
 438                 bool is_digital = edid->input & DRM_EDID_INPUT_DIGITAL;
 439
 440                 /*
 441                  * This may be a DVI-I connector with a shared DDC
 442                  * link between analog and digital outputs, so we
 443                  * have to check the EDID input spec of the attached device.
 444                  */
 445                 if (!is_digital) {
 446                         DRM_DEBUG_KMS("CRT detected via DDC:0x50 [EDID]\n");
 447                         return true;
 448                 }
 449
 450                 DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [EDID reports a digital panel]\n");
 451         } else {
 452                 DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [no valid EDID found]\n");
 453         }
 454
 455         kfree(edid);
 456
 457         return false;
 458 }
 459
 460 static enum drm_connector_status
 461 intel_crt_load_detect(struct intel_crt *crt)
 462 {
 463         struct drm_device *dev = crt->base.base.dev;
 464         struct drm_i915_private *dev_priv = dev->dev_private;
 465         uint32_t pipe = to_intel_crtc(crt->base.base.crtc)->pipe;
 466         uint32_t save_bclrpat;
 467         uint32_t save_vtotal;
 468         uint32_t vtotal, vactive;
 469         uint32_t vsample;
 470         uint32_t vblank, vblank_start, vblank_end;
 471         uint32_t dsl;
 472         uint32_t bclrpat_reg;
 473         uint32_t vtotal_reg;
 474         uint32_t vblank_reg;
 475         uint32_t vsync_reg;
 476         uint32_t pipeconf_reg;
 477         uint32_t pipe_dsl_reg;
 478         uint8_t st00;
 479         enum drm_connector_status status;
 480
 481         DRM_DEBUG_KMS("starting load-detect on CRT\n");
 482
 483         bclrpat_reg = BCLRPAT(pipe);
 484         vtotal_reg = VTOTAL(pipe);
 485         vblank_reg = VBLANK(pipe);
 486         vsync_reg = VSYNC(pipe);
 487         pipeconf_reg = PIPECONF(pipe);
 488         pipe_dsl_reg = PIPEDSL(pipe);
 489
 490         save_bclrpat = I915_READ(bclrpat_reg);
 491         save_vtotal = I915_READ(vtotal_reg);
 492         vblank = I915_READ(vblank_reg);
 493
 494         vtotal = ((save_vtotal >> 16) & 0xfff) + 1;
 495         vactive = (save_vtotal & 0x7ff) + 1;
 496
 497         vblank_start = (vblank & 0xfff) + 1;
 498         vblank_end = ((vblank >> 16) & 0xfff) + 1;
 499
 500         /* Set the border color to purple. */
 501         I915_WRITE(bclrpat_reg, 0x500050);
 502
 503         if (!IS_GEN2(dev)) {
 504                 uint32_t pipeconf = I915_READ(pipeconf_reg);
 505                 I915_WRITE(pipeconf_reg, pipeconf | PIPECONF_FORCE_BORDER);
 506                 POSTING_READ(pipeconf_reg);
 507                 /* Wait for next Vblank to substitue
 508                  * border color for Color info */
 509                 intel_wait_for_vblank(dev, pipe);
 510                 st00 = I915_READ8(VGA_MSR_WRITE);
 511                 status = ((st00 & (1 << 4)) != 0) ?
 512                         connector_status_connected :
 513                         connector_status_disconnected;
 514
 515                 I915_WRITE(pipeconf_reg, pipeconf);
 516         } else {
 517                 bool restore_vblank = false;
 518                 int count, detect;
 519
 520                 /*
 521                 * If there isn't any border, add some.
 522                 * Yes, this will flicker
 523                 */
 524                 if (vblank_start <= vactive && vblank_end >= vtotal) {
 525                         uint32_t vsync = I915_READ(vsync_reg);
 526                         uint32_t vsync_start = (vsync & 0xffff) + 1;
 527
 528                         vblank_start = vsync_start;
 529                         I915_WRITE(vblank_reg,
 530                                    (vblank_start - 1) |
 531                                    ((vblank_end - 1) << 16));
 532                         restore_vblank = true;
 533                 }
 534                 /* sample in the vertical border, selecting the larger one */
 535                 if (vblank_start - vactive >= vtotal - vblank_end)
 536                         vsample = (vblank_start + vactive) >> 1;
 537                 else
 538                         vsample = (vtotal + vblank_end) >> 1;
 539
 540                 /*
 541                  * Wait for the border to be displayed
 542                  */
 543                 while (I915_READ(pipe_dsl_reg) >= vactive)
 544                         ;
 545                 while ((dsl = I915_READ(pipe_dsl_reg)) <= vsample)
 546                         ;
 547                 /*
 548                  * Watch ST00 for an entire scanline
 549                  */
 550                 detect = 0;
 551                 count = 0;
 552                 do {
 553                         count++;
 554                         /* Read the ST00 VGA status register */
 555                         st00 = I915_READ8(VGA_MSR_WRITE);
 556                         if (st00 & (1 << 4))
 557                                 detect++;
 558                 } while ((I915_READ(pipe_dsl_reg) == dsl));
 559
 560                 /* restore vblank if necessary */
 561                 if (restore_vblank)
 562                         I915_WRITE(vblank_reg, vblank);
 563                 /*
 564                  * If more than 3/4 of the scanline detected a monitor,
 565                  * then it is assumed to be present. This works even on i830,
 566                  * where there isn't any way to force the border color across
 567                  * the screen
 568                  */
 569                 status = detect * 4 > count * 3 ?
 570                          connector_status_connected :
 571                          connector_status_disconnected;
 572         }
 573
 574         /* Restore previous settings */
 575         I915_WRITE(bclrpat_reg, save_bclrpat);
 576
 577         return status;
 578 }
 579
 580 static enum drm_connector_status
 581 intel_crt_detect(struct drm_connector *connector, bool force)
 582 {
 583         struct drm_device *dev = connector->dev;
 584         struct intel_crt *crt = intel_attached_crt(connector);
 585         enum drm_connector_status status;
 586         struct intel_load_detect_pipe tmp;
 587
 588         if (I915_HAS_HOTPLUG(dev)) {
 589                 /* We can not rely on the HPD pin always being correctly wired
 590                  * up, for example many KVM do not pass it through, and so
 591                  * only trust an assertion that the monitor is connected.
 592                  */
 593                 if (intel_crt_detect_hotplug(connector)) {
 594                         DRM_DEBUG_KMS("CRT detected via hotplug\n");
 595                         return connector_status_connected;
 596                 } else
 597                         DRM_DEBUG_KMS("CRT not detected via hotplug\n");
 598         }
 599
 600         if (intel_crt_detect_ddc(connector))
 601                 return connector_status_connected;
 602
 603         /* Load detection is broken on HPD capable machines. Whoever wants a
 604          * broken monitor (without edid) to work behind a broken kvm (that fails
 605          * to have the right resistors for HP detection) needs to fix this up.
 606          * For now just bail out. */
 607         if (I915_HAS_HOTPLUG(dev))
 608                 return connector_status_disconnected;
 609
 610         if (!force)
 611                 return connector->status;
 612
 613         /* for pre-945g platforms use load detect */
 614         if (intel_get_load_detect_pipe(connector, NULL, &tmp)) {
 615                 if (intel_crt_detect_ddc(connector))
 616                         status = connector_status_connected;
 617                 else
 618                         status = intel_crt_load_detect(crt);
 619                 intel_release_load_detect_pipe(connector, &tmp);
 620         } else
 621                 status = connector_status_unknown;
 622
 623         return status;
 624 }
 625
 626 static void intel_crt_destroy(struct drm_connector *connector)
 627 {
 628         drm_sysfs_connector_remove(connector);
 629         drm_connector_cleanup(connector);
 630         kfree(connector);
 631 }
 632
 633 static int intel_crt_get_modes(struct drm_connector *connector)
 634 {
 635         struct drm_device *dev = connector->dev;
 636         struct drm_i915_private *dev_priv = dev->dev_private;
 637         int ret;
 638         struct i2c_adapter *i2c;
 639
 640         i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->crt_ddc_pin);
 641         ret = intel_crt_ddc_get_modes(connector, i2c);
 642         if (ret || !IS_G4X(dev))
 643                 return ret;
 644
 645         /* Try to probe digital port for output in DVI-I -> VGA mode. */
 646         i2c = intel_gmbus_get_adapter(dev_priv, GMBUS_PORT_DPB);
 647         return intel_crt_ddc_get_modes(connector, i2c);
 648 }
 649
 650 static int intel_crt_set_property(struct drm_connector *connector,
 651                                   struct drm_property *property,
 652                                   uint64_t value)
 653 {
 654         return 0;
 655 }
 656
 657 static void intel_crt_reset(struct drm_connector *connector)
 658 {
 659         struct drm_device *dev = connector->dev;
 660         struct intel_crt *crt = intel_attached_crt(connector);
 661
 662         if (HAS_PCH_SPLIT(dev))
 663                 crt->force_hotplug_required = 1;
 664 }
 665
 666 /*
 667  * Routines for controlling stuff on the analog port
 668  */
 669
 670 static const struct drm_encoder_helper_funcs crt_encoder_funcs = {
 671         .mode_fixup = intel_crt_mode_fixup,
 672         .mode_set = intel_crt_mode_set,
 673         .disable = intel_encoder_noop,
 674 };
 675
 676 static const struct drm_connector_funcs intel_crt_connector_funcs = {
 677         .reset = intel_crt_reset,
 678         .dpms = intel_crt_dpms,
 679         .detect = intel_crt_detect,
 680         .fill_modes = drm_helper_probe_single_connector_modes,
 681         .destroy = intel_crt_destroy,
 682         .set_property = intel_crt_set_property,
 683 };
 684
 685 static const struct drm_connector_helper_funcs intel_crt_connector_helper_funcs = {
 686         .mode_valid = intel_crt_mode_valid,
 687         .get_modes = intel_crt_get_modes,
 688         .best_encoder = intel_best_encoder,
 689 };
 690
 691 static const struct drm_encoder_funcs intel_crt_enc_funcs = {
 692         .destroy = intel_encoder_destroy,
 693 };
 694
 695 static int __init intel_no_crt_dmi_callback(const struct dmi_system_id *id)
 696 {
 697         DRM_INFO("Skipping CRT initialization for %s\n", id->ident);
 698         return 1;
 699 }
 700
 701 static const struct dmi_system_id intel_no_crt[] = {
 702         {
 703                 .callback = intel_no_crt_dmi_callback,
 704                 .ident = "ACER ZGB",
 705                 .matches = {
 706                         DMI_MATCH(DMI_SYS_VENDOR, "ACER"),
 707                         DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
 708                 },
 709         },
 710         { }
 711 };
 712
 713 void intel_crt_init(struct drm_device *dev)
 714 {
 715         struct drm_connector *connector;
 716         struct intel_crt *crt;
 717         struct intel_connector *intel_connector;
 718         struct drm_i915_private *dev_priv = dev->dev_private;
 719
 720         /* Skip machines without VGA that falsely report hotplug events */
 721         if (dmi_check_system(intel_no_crt))
 722                 return;
 723
 724         crt = kzalloc(sizeof(struct intel_crt), GFP_KERNEL);
 725         if (!crt)
 726                 return;
 727
 728         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
 729         if (!intel_connector) {
 730                 kfree(crt);
 731                 return;
 732         }
 733
 734         connector = &intel_connector->base;
 735         drm_connector_init(dev, &intel_connector->base,
 736                            &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);
 737
 738         drm_encoder_init(dev, &crt->base.base, &intel_crt_enc_funcs,
 739                          DRM_MODE_ENCODER_DAC);
 740
 741         intel_connector_attach_encoder(intel_connector, &crt->base);
 742
 743         crt->base.type = INTEL_OUTPUT_ANALOG;
 744         crt->base.cloneable = true;
 745         if (IS_HASWELL(dev))
 746                 crt->base.crtc_mask = (1 << 0);
 747         else
 748                 crt->base.crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
 749
 750         if (IS_GEN2(dev))
 751                 connector->interlace_allowed = 0;
 752         else
 753                 connector->interlace_allowed = 1;
 754         connector->doublescan_allowed = 0;
 755
 756         if (HAS_PCH_SPLIT(dev))
 757                 crt->adpa_reg = PCH_ADPA;
 758         else if (IS_VALLEYVIEW(dev))
 759                 crt->adpa_reg = VLV_ADPA;
 760         else
 761                 crt->adpa_reg = ADPA;
 762
 763         crt->base.disable = intel_disable_crt;
 764         crt->base.enable = intel_enable_crt;
 765         crt->base.get_hw_state = intel_crt_get_hw_state;
 766         intel_connector->get_hw_state = intel_connector_get_hw_state;
 767
 768         drm_encoder_helper_add(&crt->base.base, &crt_encoder_funcs);
 769         drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs);
 770
 771         drm_sysfs_connector_add(connector);
 772
 773         if (I915_HAS_HOTPLUG(dev))
 774                 connector->polled = DRM_CONNECTOR_POLL_HPD;
 775         else
 776                 connector->polled = DRM_CONNECTOR_POLL_CONNECT;
 777
 778         /*
 779          * Configure the automatic hotplug detection stuff
 780          */
 781         crt->force_hotplug_required = 0;
 782         if (HAS_PCH_SPLIT(dev)) {
 783                 u32 adpa;
 784
 785                 adpa = I915_READ(PCH_ADPA);
 786                 adpa &= ~ADPA_CRT_HOTPLUG_MASK;
 787                 adpa |= ADPA_HOTPLUG_BITS;
 788                 I915_WRITE(PCH_ADPA, adpa);
 789                 POSTING_READ(PCH_ADPA);
 790
 791                 DRM_DEBUG_KMS("pch crt adpa set to 0x%x\n", adpa);
 792                 crt->force_hotplug_required = 1;
 793         }
 794
 795         dev_priv->hotplug_supported_mask |= CRT_HOTPLUG_INT_STATUS;
 796 }