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         u32 adpa;
 223
 224         if (HAS_PCH_SPLIT(dev))
 225                 adpa = ADPA_HOTPLUG_BITS;
 226         else
 227                 adpa = 0;
 228
 229         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 230                 adpa |= ADPA_HSYNC_ACTIVE_HIGH;
 231         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 232                 adpa |= ADPA_VSYNC_ACTIVE_HIGH;
 233
 234         /* For CPT allow 3 pipe config, for others just use A or B */
 235         if (HAS_PCH_LPT(dev))
 236                 ; /* Those bits don't exist here */
 237         else if (HAS_PCH_CPT(dev))
 238                 adpa |= PORT_TRANS_SEL_CPT(intel_crtc->pipe);
 239         else if (intel_crtc->pipe == 0)
 240                 adpa |= ADPA_PIPE_A_SELECT;
 241         else
 242                 adpa |= ADPA_PIPE_B_SELECT;
 243
 244         if (!HAS_PCH_SPLIT(dev))
 245                 I915_WRITE(BCLRPAT(intel_crtc->pipe), 0);
 246
 247         I915_WRITE(crt->adpa_reg, adpa);
 248 }
 249
 250 static bool intel_ironlake_crt_detect_hotplug(struct drm_connector *connector)
 251 {
 252         struct drm_device *dev = connector->dev;
 253         struct intel_crt *crt = intel_attached_crt(connector);
 254         struct drm_i915_private *dev_priv = dev->dev_private;
 255         u32 adpa;
 256         bool ret;
 257
 258         /* The first time through, trigger an explicit detection cycle */
 259         if (crt->force_hotplug_required) {
 260                 bool turn_off_dac = HAS_PCH_SPLIT(dev);
 261                 u32 save_adpa;
 262
 263                 crt->force_hotplug_required = 0;
 264
 265                 save_adpa = adpa = I915_READ(PCH_ADPA);
 266                 DRM_DEBUG_KMS("trigger hotplug detect cycle: adpa=0x%x\n", adpa);
 267
 268                 adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
 269                 if (turn_off_dac)
 270                         adpa &= ~ADPA_DAC_ENABLE;
 271
 272                 I915_WRITE(PCH_ADPA, adpa);
 273
 274                 if (wait_for((I915_READ(PCH_ADPA) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) == 0,
 275                              1000))
 276                         DRM_DEBUG_KMS("timed out waiting for FORCE_TRIGGER");
 277
 278                 if (turn_off_dac) {
 279                         I915_WRITE(PCH_ADPA, save_adpa);
 280                         POSTING_READ(PCH_ADPA);
 281                 }
 282         }
 283
 284         /* Check the status to see if both blue and green are on now */
 285         adpa = I915_READ(PCH_ADPA);
 286         if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
 287                 ret = true;
 288         else
 289                 ret = false;
 290         DRM_DEBUG_KMS("ironlake hotplug adpa=0x%x, result %d\n", adpa, ret);
 291
 292         return ret;
 293 }
 294
 295 static bool valleyview_crt_detect_hotplug(struct drm_connector *connector)
 296 {
 297         struct drm_device *dev = connector->dev;
 298         struct drm_i915_private *dev_priv = dev->dev_private;
 299         u32 adpa;
 300         bool ret;
 301         u32 save_adpa;
 302
 303         save_adpa = adpa = I915_READ(ADPA);
 304         DRM_DEBUG_KMS("trigger hotplug detect cycle: adpa=0x%x\n", adpa);
 305
 306         adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
 307
 308         I915_WRITE(ADPA, adpa);
 309
 310         if (wait_for((I915_READ(ADPA) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) == 0,
 311                      1000)) {
 312                 DRM_DEBUG_KMS("timed out waiting for FORCE_TRIGGER");
 313                 I915_WRITE(ADPA, save_adpa);
 314         }
 315
 316         /* Check the status to see if both blue and green are on now */
 317         adpa = I915_READ(ADPA);
 318         if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
 319                 ret = true;
 320         else
 321                 ret = false;
 322
 323         DRM_DEBUG_KMS("valleyview hotplug adpa=0x%x, result %d\n", adpa, ret);
 324
 325         /* FIXME: debug force function and remove */
 326         ret = true;
 327
 328         return ret;
 329 }
 330
 331 /**
 332  * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect CRT presence.
 333  *
 334  * Not for i915G/i915GM
 335  *
 336  * \return true if CRT is connected.
 337  * \return false if CRT is disconnected.
 338  */
 339 static bool intel_crt_detect_hotplug(struct drm_connector *connector)
 340 {
 341         struct drm_device *dev = connector->dev;
 342         struct drm_i915_private *dev_priv = dev->dev_private;
 343         u32 hotplug_en, orig, stat;
 344         bool ret = false;
 345         int i, tries = 0;
 346
 347         if (HAS_PCH_SPLIT(dev))
 348                 return intel_ironlake_crt_detect_hotplug(connector);
 349
 350         if (IS_VALLEYVIEW(dev))
 351                 return valleyview_crt_detect_hotplug(connector);
 352
 353         /*
 354          * On 4 series desktop, CRT detect sequence need to be done twice
 355          * to get a reliable result.
 356          */
 357
 358         if (IS_G4X(dev) && !IS_GM45(dev))
 359                 tries = 2;
 360         else
 361                 tries = 1;
 362         hotplug_en = orig = I915_READ(PORT_HOTPLUG_EN);
 363         hotplug_en |= CRT_HOTPLUG_FORCE_DETECT;
 364
 365         for (i = 0; i < tries ; i++) {
 366                 /* turn on the FORCE_DETECT */
 367                 I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);
 368                 /* wait for FORCE_DETECT to go off */
 369                 if (wait_for((I915_READ(PORT_HOTPLUG_EN) &
 370                               CRT_HOTPLUG_FORCE_DETECT) == 0,
 371                              1000))
 372                         DRM_DEBUG_KMS("timed out waiting for FORCE_DETECT to go off");
 373         }
 374
 375         stat = I915_READ(PORT_HOTPLUG_STAT);
 376         if ((stat & CRT_HOTPLUG_MONITOR_MASK) != CRT_HOTPLUG_MONITOR_NONE)
 377                 ret = true;
 378
 379         /* clear the interrupt we just generated, if any */
 380         I915_WRITE(PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS);
 381
 382         /* and put the bits back */
 383         I915_WRITE(PORT_HOTPLUG_EN, orig);
 384
 385         return ret;
 386 }
 387
 388 static struct edid *intel_crt_get_edid(struct drm_connector *connector,
 389                                 struct i2c_adapter *i2c)
 390 {
 391         struct edid *edid;
 392
 393         edid = drm_get_edid(connector, i2c);
 394
 395         if (!edid && !intel_gmbus_is_forced_bit(i2c)) {
 396                 DRM_DEBUG_KMS("CRT GMBUS EDID read failed, retry using GPIO bit-banging\n");
 397                 intel_gmbus_force_bit(i2c, true);
 398                 edid = drm_get_edid(connector, i2c);
 399                 intel_gmbus_force_bit(i2c, false);
 400         }
 401
 402         return edid;
 403 }
 404
 405 /* local version of intel_ddc_get_modes() to use intel_crt_get_edid() */
 406 static int intel_crt_ddc_get_modes(struct drm_connector *connector,
 407                                 struct i2c_adapter *adapter)
 408 {
 409         struct edid *edid;
 410         int ret;
 411
 412         edid = intel_crt_get_edid(connector, adapter);
 413         if (!edid)
 414                 return 0;
 415
 416         ret = intel_connector_update_modes(connector, edid);
 417         kfree(edid);
 418
 419         return ret;
 420 }
 421
 422 static bool intel_crt_detect_ddc(struct drm_connector *connector)
 423 {
 424         struct intel_crt *crt = intel_attached_crt(connector);
 425         struct drm_i915_private *dev_priv = crt->base.base.dev->dev_private;
 426         struct edid *edid;
 427         struct i2c_adapter *i2c;
 428
 429         BUG_ON(crt->base.type != INTEL_OUTPUT_ANALOG);
 430
 431         i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->crt_ddc_pin);
 432         edid = intel_crt_get_edid(connector, i2c);
 433
 434         if (edid) {
 435                 bool is_digital = edid->input & DRM_EDID_INPUT_DIGITAL;
 436
 437                 /*
 438                  * This may be a DVI-I connector with a shared DDC
 439                  * link between analog and digital outputs, so we
 440                  * have to check the EDID input spec of the attached device.
 441                  */
 442                 if (!is_digital) {
 443                         DRM_DEBUG_KMS("CRT detected via DDC:0x50 [EDID]\n");
 444                         return true;
 445                 }
 446
 447                 DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [EDID reports a digital panel]\n");
 448         } else {
 449                 DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [no valid EDID found]\n");
 450         }
 451
 452         kfree(edid);
 453
 454         return false;
 455 }
 456
 457 static enum drm_connector_status
 458 intel_crt_load_detect(struct intel_crt *crt)
 459 {
 460         struct drm_device *dev = crt->base.base.dev;
 461         struct drm_i915_private *dev_priv = dev->dev_private;
 462         uint32_t pipe = to_intel_crtc(crt->base.base.crtc)->pipe;
 463         uint32_t save_bclrpat;
 464         uint32_t save_vtotal;
 465         uint32_t vtotal, vactive;
 466         uint32_t vsample;
 467         uint32_t vblank, vblank_start, vblank_end;
 468         uint32_t dsl;
 469         uint32_t bclrpat_reg;
 470         uint32_t vtotal_reg;
 471         uint32_t vblank_reg;
 472         uint32_t vsync_reg;
 473         uint32_t pipeconf_reg;
 474         uint32_t pipe_dsl_reg;
 475         uint8_t st00;
 476         enum drm_connector_status status;
 477
 478         DRM_DEBUG_KMS("starting load-detect on CRT\n");
 479
 480         bclrpat_reg = BCLRPAT(pipe);
 481         vtotal_reg = VTOTAL(pipe);
 482         vblank_reg = VBLANK(pipe);
 483         vsync_reg = VSYNC(pipe);
 484         pipeconf_reg = PIPECONF(pipe);
 485         pipe_dsl_reg = PIPEDSL(pipe);
 486
 487         save_bclrpat = I915_READ(bclrpat_reg);
 488         save_vtotal = I915_READ(vtotal_reg);
 489         vblank = I915_READ(vblank_reg);
 490
 491         vtotal = ((save_vtotal >> 16) & 0xfff) + 1;
 492         vactive = (save_vtotal & 0x7ff) + 1;
 493
 494         vblank_start = (vblank & 0xfff) + 1;
 495         vblank_end = ((vblank >> 16) & 0xfff) + 1;
 496
 497         /* Set the border color to purple. */
 498         I915_WRITE(bclrpat_reg, 0x500050);
 499
 500         if (!IS_GEN2(dev)) {
 501                 uint32_t pipeconf = I915_READ(pipeconf_reg);
 502                 I915_WRITE(pipeconf_reg, pipeconf | PIPECONF_FORCE_BORDER);
 503                 POSTING_READ(pipeconf_reg);
 504                 /* Wait for next Vblank to substitue
 505                  * border color for Color info */
 506                 intel_wait_for_vblank(dev, pipe);
 507                 st00 = I915_READ8(VGA_MSR_WRITE);
 508                 status = ((st00 & (1 << 4)) != 0) ?
 509                         connector_status_connected :
 510                         connector_status_disconnected;
 511
 512                 I915_WRITE(pipeconf_reg, pipeconf);
 513         } else {
 514                 bool restore_vblank = false;
 515                 int count, detect;
 516
 517                 /*
 518                 * If there isn't any border, add some.
 519                 * Yes, this will flicker
 520                 */
 521                 if (vblank_start <= vactive && vblank_end >= vtotal) {
 522                         uint32_t vsync = I915_READ(vsync_reg);
 523                         uint32_t vsync_start = (vsync & 0xffff) + 1;
 524
 525                         vblank_start = vsync_start;
 526                         I915_WRITE(vblank_reg,
 527                                    (vblank_start - 1) |
 528                                    ((vblank_end - 1) << 16));
 529                         restore_vblank = true;
 530                 }
 531                 /* sample in the vertical border, selecting the larger one */
 532                 if (vblank_start - vactive >= vtotal - vblank_end)
 533                         vsample = (vblank_start + vactive) >> 1;
 534                 else
 535                         vsample = (vtotal + vblank_end) >> 1;
 536
 537                 /*
 538                  * Wait for the border to be displayed
 539                  */
 540                 while (I915_READ(pipe_dsl_reg) >= vactive)
 541                         ;
 542                 while ((dsl = I915_READ(pipe_dsl_reg)) <= vsample)
 543                         ;
 544                 /*
 545                  * Watch ST00 for an entire scanline
 546                  */
 547                 detect = 0;
 548                 count = 0;
 549                 do {
 550                         count++;
 551                         /* Read the ST00 VGA status register */
 552                         st00 = I915_READ8(VGA_MSR_WRITE);
 553                         if (st00 & (1 << 4))
 554                                 detect++;
 555                 } while ((I915_READ(pipe_dsl_reg) == dsl));
 556
 557                 /* restore vblank if necessary */
 558                 if (restore_vblank)
 559                         I915_WRITE(vblank_reg, vblank);
 560                 /*
 561                  * If more than 3/4 of the scanline detected a monitor,
 562                  * then it is assumed to be present. This works even on i830,
 563                  * where there isn't any way to force the border color across
 564                  * the screen
 565                  */
 566                 status = detect * 4 > count * 3 ?
 567                          connector_status_connected :
 568                          connector_status_disconnected;
 569         }
 570
 571         /* Restore previous settings */
 572         I915_WRITE(bclrpat_reg, save_bclrpat);
 573
 574         return status;
 575 }
 576
 577 static enum drm_connector_status
 578 intel_crt_detect(struct drm_connector *connector, bool force)
 579 {
 580         struct drm_device *dev = connector->dev;
 581         struct intel_crt *crt = intel_attached_crt(connector);
 582         enum drm_connector_status status;
 583         struct intel_load_detect_pipe tmp;
 584
 585         if (I915_HAS_HOTPLUG(dev)) {
 586                 /* We can not rely on the HPD pin always being correctly wired
 587                  * up, for example many KVM do not pass it through, and so
 588                  * only trust an assertion that the monitor is connected.
 589                  */
 590                 if (intel_crt_detect_hotplug(connector)) {
 591                         DRM_DEBUG_KMS("CRT detected via hotplug\n");
 592                         return connector_status_connected;
 593                 } else
 594                         DRM_DEBUG_KMS("CRT not detected via hotplug\n");
 595         }
 596
 597         if (intel_crt_detect_ddc(connector))
 598                 return connector_status_connected;
 599
 600         /* Load detection is broken on HPD capable machines. Whoever wants a
 601          * broken monitor (without edid) to work behind a broken kvm (that fails
 602          * to have the right resistors for HP detection) needs to fix this up.
 603          * For now just bail out. */
 604         if (I915_HAS_HOTPLUG(dev))
 605                 return connector_status_disconnected;
 606
 607         if (!force)
 608                 return connector->status;
 609
 610         /* for pre-945g platforms use load detect */
 611         if (intel_get_load_detect_pipe(connector, NULL, &tmp)) {
 612                 if (intel_crt_detect_ddc(connector))
 613                         status = connector_status_connected;
 614                 else
 615                         status = intel_crt_load_detect(crt);
 616                 intel_release_load_detect_pipe(connector, &tmp);
 617         } else
 618                 status = connector_status_unknown;
 619
 620         return status;
 621 }
 622
 623 static void intel_crt_destroy(struct drm_connector *connector)
 624 {
 625         drm_sysfs_connector_remove(connector);
 626         drm_connector_cleanup(connector);
 627         kfree(connector);
 628 }
 629
 630 static int intel_crt_get_modes(struct drm_connector *connector)
 631 {
 632         struct drm_device *dev = connector->dev;
 633         struct drm_i915_private *dev_priv = dev->dev_private;
 634         int ret;
 635         struct i2c_adapter *i2c;
 636
 637         i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->crt_ddc_pin);
 638         ret = intel_crt_ddc_get_modes(connector, i2c);
 639         if (ret || !IS_G4X(dev))
 640                 return ret;
 641
 642         /* Try to probe digital port for output in DVI-I -> VGA mode. */
 643         i2c = intel_gmbus_get_adapter(dev_priv, GMBUS_PORT_DPB);
 644         return intel_crt_ddc_get_modes(connector, i2c);
 645 }
 646
 647 static int intel_crt_set_property(struct drm_connector *connector,
 648                                   struct drm_property *property,
 649                                   uint64_t value)
 650 {
 651         return 0;
 652 }
 653
 654 static void intel_crt_reset(struct drm_connector *connector)
 655 {
 656         struct drm_device *dev = connector->dev;
 657         struct drm_i915_private *dev_priv = dev->dev_private;
 658         struct intel_crt *crt = intel_attached_crt(connector);
 659
 660         if (HAS_PCH_SPLIT(dev)) {
 661                 u32 adpa;
 662
 663                 adpa = I915_READ(PCH_ADPA);
 664                 adpa &= ~ADPA_CRT_HOTPLUG_MASK;
 665                 adpa |= ADPA_HOTPLUG_BITS;
 666                 I915_WRITE(PCH_ADPA, adpa);
 667                 POSTING_READ(PCH_ADPA);
 668
 669                 DRM_DEBUG_KMS("pch crt adpa set to 0x%x\n", adpa);
 670                 crt->force_hotplug_required = 1;
 671         }
 672
 673 }
 674
 675 /*
 676  * Routines for controlling stuff on the analog port
 677  */
 678
 679 static const struct drm_encoder_helper_funcs crt_encoder_funcs = {
 680         .mode_fixup = intel_crt_mode_fixup,
 681         .mode_set = intel_crt_mode_set,
 682         .disable = intel_encoder_noop,
 683 };
 684
 685 static const struct drm_connector_funcs intel_crt_connector_funcs = {
 686         .reset = intel_crt_reset,
 687         .dpms = intel_crt_dpms,
 688         .detect = intel_crt_detect,
 689         .fill_modes = drm_helper_probe_single_connector_modes,
 690         .destroy = intel_crt_destroy,
 691         .set_property = intel_crt_set_property,
 692 };
 693
 694 static const struct drm_connector_helper_funcs intel_crt_connector_helper_funcs = {
 695         .mode_valid = intel_crt_mode_valid,
 696         .get_modes = intel_crt_get_modes,
 697         .best_encoder = intel_best_encoder,
 698 };
 699
 700 static const struct drm_encoder_funcs intel_crt_enc_funcs = {
 701         .destroy = intel_encoder_destroy,
 702 };
 703
 704 static int __init intel_no_crt_dmi_callback(const struct dmi_system_id *id)
 705 {
 706         DRM_INFO("Skipping CRT initialization for %s\n", id->ident);
 707         return 1;
 708 }
 709
 710 static const struct dmi_system_id intel_no_crt[] = {
 711         {
 712                 .callback = intel_no_crt_dmi_callback,
 713                 .ident = "ACER ZGB",
 714                 .matches = {
 715                         DMI_MATCH(DMI_SYS_VENDOR, "ACER"),
 716                         DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
 717                 },
 718         },
 719         { }
 720 };
 721
 722 void intel_crt_init(struct drm_device *dev)
 723 {
 724         struct drm_connector *connector;
 725         struct intel_crt *crt;
 726         struct intel_connector *intel_connector;
 727         struct drm_i915_private *dev_priv = dev->dev_private;
 728
 729         /* Skip machines without VGA that falsely report hotplug events */
 730         if (dmi_check_system(intel_no_crt))
 731                 return;
 732
 733         crt = kzalloc(sizeof(struct intel_crt), GFP_KERNEL);
 734         if (!crt)
 735                 return;
 736
 737         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
 738         if (!intel_connector) {
 739                 kfree(crt);
 740                 return;
 741         }
 742
 743         connector = &intel_connector->base;
 744         drm_connector_init(dev, &intel_connector->base,
 745                            &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);
 746
 747         drm_encoder_init(dev, &crt->base.base, &intel_crt_enc_funcs,
 748                          DRM_MODE_ENCODER_DAC);
 749
 750         intel_connector_attach_encoder(intel_connector, &crt->base);
 751
 752         crt->base.type = INTEL_OUTPUT_ANALOG;
 753         crt->base.cloneable = true;
 754         if (IS_I830(dev))
 755                 crt->base.crtc_mask = (1 << 0);
 756         else
 757                 crt->base.crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
 758
 759         if (IS_GEN2(dev))
 760                 connector->interlace_allowed = 0;
 761         else
 762                 connector->interlace_allowed = 1;
 763         connector->doublescan_allowed = 0;
 764
 765         if (HAS_PCH_SPLIT(dev))
 766                 crt->adpa_reg = PCH_ADPA;
 767         else if (IS_VALLEYVIEW(dev))
 768                 crt->adpa_reg = VLV_ADPA;
 769         else
 770                 crt->adpa_reg = ADPA;
 771
 772         crt->base.disable = intel_disable_crt;
 773         crt->base.enable = intel_enable_crt;
 774         if (HAS_DDI(dev))
 775                 crt->base.get_hw_state = intel_ddi_get_hw_state;
 776         else
 777                 crt->base.get_hw_state = intel_crt_get_hw_state;
 778         intel_connector->get_hw_state = intel_connector_get_hw_state;
 779
 780         drm_encoder_helper_add(&crt->base.base, &crt_encoder_funcs);
 781         drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs);
 782
 783         drm_sysfs_connector_add(connector);
 784
 785         if (I915_HAS_HOTPLUG(dev))
 786                 connector->polled = DRM_CONNECTOR_POLL_HPD;
 787         else
 788                 connector->polled = DRM_CONNECTOR_POLL_CONNECT;
 789
 790         /*
 791          * Configure the automatic hotplug detection stuff
 792          */
 793         crt->force_hotplug_required = 0;
 794
 795         dev_priv->hotplug_supported_mask |= CRT_HOTPLUG_INT_STATUS;
 796 }