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         if (HAS_PCH_SPLIT(dev))
 238                 adpa = ADPA_HOTPLUG_BITS;
 239         else
 240                 adpa = 0;
 241
 242         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 243                 adpa |= ADPA_HSYNC_ACTIVE_HIGH;
 244         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 245                 adpa |= ADPA_VSYNC_ACTIVE_HIGH;
 246
 247         /* For CPT allow 3 pipe config, for others just use A or B */
 248         if (HAS_PCH_CPT(dev))
 249                 adpa |= PORT_TRANS_SEL_CPT(intel_crtc->pipe);
 250         else if (intel_crtc->pipe == 0)
 251                 adpa |= ADPA_PIPE_A_SELECT;
 252         else
 253                 adpa |= ADPA_PIPE_B_SELECT;
 254
 255         if (!HAS_PCH_SPLIT(dev))
 256                 I915_WRITE(BCLRPAT(intel_crtc->pipe), 0);
 257
 258         I915_WRITE(crt->adpa_reg, adpa);
 259 }
 260
 261 static bool intel_ironlake_crt_detect_hotplug(struct drm_connector *connector)
 262 {
 263         struct drm_device *dev = connector->dev;
 264         struct intel_crt *crt = intel_attached_crt(connector);
 265         struct drm_i915_private *dev_priv = dev->dev_private;
 266         u32 adpa;
 267         bool ret;
 268
 269         /* The first time through, trigger an explicit detection cycle */
 270         if (crt->force_hotplug_required) {
 271                 bool turn_off_dac = HAS_PCH_SPLIT(dev);
 272                 u32 save_adpa;
 273
 274                 crt->force_hotplug_required = 0;
 275
 276                 save_adpa = adpa = I915_READ(PCH_ADPA);
 277                 DRM_DEBUG_KMS("trigger hotplug detect cycle: adpa=0x%x\n", adpa);
 278
 279                 adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
 280                 if (turn_off_dac)
 281                         adpa &= ~ADPA_DAC_ENABLE;
 282
 283                 I915_WRITE(PCH_ADPA, adpa);
 284
 285                 if (wait_for((I915_READ(PCH_ADPA) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) == 0,
 286                              1000))
 287                         DRM_DEBUG_KMS("timed out waiting for FORCE_TRIGGER");
 288
 289                 if (turn_off_dac) {
 290                         I915_WRITE(PCH_ADPA, save_adpa);
 291                         POSTING_READ(PCH_ADPA);
 292                 }
 293         }
 294
 295         /* Check the status to see if both blue and green are on now */
 296         adpa = I915_READ(PCH_ADPA);
 297         if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
 298                 ret = true;
 299         else
 300                 ret = false;
 301         DRM_DEBUG_KMS("ironlake hotplug adpa=0x%x, result %d\n", adpa, ret);
 302
 303         return ret;
 304 }
 305
 306 static bool valleyview_crt_detect_hotplug(struct drm_connector *connector)
 307 {
 308         struct drm_device *dev = connector->dev;
 309         struct drm_i915_private *dev_priv = dev->dev_private;
 310         u32 adpa;
 311         bool ret;
 312         u32 save_adpa;
 313
 314         save_adpa = adpa = I915_READ(ADPA);
 315         DRM_DEBUG_KMS("trigger hotplug detect cycle: adpa=0x%x\n", adpa);
 316
 317         adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
 318
 319         I915_WRITE(ADPA, adpa);
 320
 321         if (wait_for((I915_READ(ADPA) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) == 0,
 322                      1000)) {
 323                 DRM_DEBUG_KMS("timed out waiting for FORCE_TRIGGER");
 324                 I915_WRITE(ADPA, save_adpa);
 325         }
 326
 327         /* Check the status to see if both blue and green are on now */
 328         adpa = I915_READ(ADPA);
 329         if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
 330                 ret = true;
 331         else
 332                 ret = false;
 333
 334         DRM_DEBUG_KMS("valleyview hotplug adpa=0x%x, result %d\n", adpa, ret);
 335
 336         /* FIXME: debug force function and remove */
 337         ret = true;
 338
 339         return ret;
 340 }
 341
 342 /**
 343  * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect CRT presence.
 344  *
 345  * Not for i915G/i915GM
 346  *
 347  * \return true if CRT is connected.
 348  * \return false if CRT is disconnected.
 349  */
 350 static bool intel_crt_detect_hotplug(struct drm_connector *connector)
 351 {
 352         struct drm_device *dev = connector->dev;
 353         struct drm_i915_private *dev_priv = dev->dev_private;
 354         u32 hotplug_en, orig, stat;
 355         bool ret = false;
 356         int i, tries = 0;
 357
 358         if (HAS_PCH_SPLIT(dev))
 359                 return intel_ironlake_crt_detect_hotplug(connector);
 360
 361         if (IS_VALLEYVIEW(dev))
 362                 return valleyview_crt_detect_hotplug(connector);
 363
 364         /*
 365          * On 4 series desktop, CRT detect sequence need to be done twice
 366          * to get a reliable result.
 367          */
 368
 369         if (IS_G4X(dev) && !IS_GM45(dev))
 370                 tries = 2;
 371         else
 372                 tries = 1;
 373         hotplug_en = orig = I915_READ(PORT_HOTPLUG_EN);
 374         hotplug_en |= CRT_HOTPLUG_FORCE_DETECT;
 375
 376         for (i = 0; i < tries ; i++) {
 377                 /* turn on the FORCE_DETECT */
 378                 I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);
 379                 /* wait for FORCE_DETECT to go off */
 380                 if (wait_for((I915_READ(PORT_HOTPLUG_EN) &
 381                               CRT_HOTPLUG_FORCE_DETECT) == 0,
 382                              1000))
 383                         DRM_DEBUG_KMS("timed out waiting for FORCE_DETECT to go off");
 384         }
 385
 386         stat = I915_READ(PORT_HOTPLUG_STAT);
 387         if ((stat & CRT_HOTPLUG_MONITOR_MASK) != CRT_HOTPLUG_MONITOR_NONE)
 388                 ret = true;
 389
 390         /* clear the interrupt we just generated, if any */
 391         I915_WRITE(PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS);
 392
 393         /* and put the bits back */
 394         I915_WRITE(PORT_HOTPLUG_EN, orig);
 395
 396         return ret;
 397 }
 398
 399 static struct edid *intel_crt_get_edid(struct drm_connector *connector,
 400                                 struct i2c_adapter *i2c)
 401 {
 402         struct edid *edid;
 403
 404         edid = drm_get_edid(connector, i2c);
 405
 406         if (!edid && !intel_gmbus_is_forced_bit(i2c)) {
 407                 DRM_DEBUG_KMS("CRT GMBUS EDID read failed, retry using GPIO bit-banging\n");
 408                 intel_gmbus_force_bit(i2c, true);
 409                 edid = drm_get_edid(connector, i2c);
 410                 intel_gmbus_force_bit(i2c, false);
 411         }
 412
 413         return edid;
 414 }
 415
 416 /* local version of intel_ddc_get_modes() to use intel_crt_get_edid() */
 417 static int intel_crt_ddc_get_modes(struct drm_connector *connector,
 418                                 struct i2c_adapter *adapter)
 419 {
 420         struct edid *edid;
 421
 422         edid = intel_crt_get_edid(connector, adapter);
 423         if (!edid)
 424                 return 0;
 425
 426         return intel_connector_update_modes(connector, edid);
 427 }
 428
 429 static bool intel_crt_detect_ddc(struct drm_connector *connector)
 430 {
 431         struct intel_crt *crt = intel_attached_crt(connector);
 432         struct drm_i915_private *dev_priv = crt->base.base.dev->dev_private;
 433         struct edid *edid;
 434         struct i2c_adapter *i2c;
 435
 436         BUG_ON(crt->base.type != INTEL_OUTPUT_ANALOG);
 437
 438         i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->crt_ddc_pin);
 439         edid = intel_crt_get_edid(connector, i2c);
 440
 441         if (edid) {
 442                 bool is_digital = edid->input & DRM_EDID_INPUT_DIGITAL;
 443
 444                 /*
 445                  * This may be a DVI-I connector with a shared DDC
 446                  * link between analog and digital outputs, so we
 447                  * have to check the EDID input spec of the attached device.
 448                  */
 449                 if (!is_digital) {
 450                         DRM_DEBUG_KMS("CRT detected via DDC:0x50 [EDID]\n");
 451                         return true;
 452                 }
 453
 454                 DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [EDID reports a digital panel]\n");
 455         } else {
 456                 DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [no valid EDID found]\n");
 457         }
 458
 459         kfree(edid);
 460
 461         return false;
 462 }
 463
 464 static enum drm_connector_status
 465 intel_crt_load_detect(struct intel_crt *crt)
 466 {
 467         struct drm_device *dev = crt->base.base.dev;
 468         struct drm_i915_private *dev_priv = dev->dev_private;
 469         uint32_t pipe = to_intel_crtc(crt->base.base.crtc)->pipe;
 470         uint32_t save_bclrpat;
 471         uint32_t save_vtotal;
 472         uint32_t vtotal, vactive;
 473         uint32_t vsample;
 474         uint32_t vblank, vblank_start, vblank_end;
 475         uint32_t dsl;
 476         uint32_t bclrpat_reg;
 477         uint32_t vtotal_reg;
 478         uint32_t vblank_reg;
 479         uint32_t vsync_reg;
 480         uint32_t pipeconf_reg;
 481         uint32_t pipe_dsl_reg;
 482         uint8_t st00;
 483         enum drm_connector_status status;
 484
 485         DRM_DEBUG_KMS("starting load-detect on CRT\n");
 486
 487         bclrpat_reg = BCLRPAT(pipe);
 488         vtotal_reg = VTOTAL(pipe);
 489         vblank_reg = VBLANK(pipe);
 490         vsync_reg = VSYNC(pipe);
 491         pipeconf_reg = PIPECONF(pipe);
 492         pipe_dsl_reg = PIPEDSL(pipe);
 493
 494         save_bclrpat = I915_READ(bclrpat_reg);
 495         save_vtotal = I915_READ(vtotal_reg);
 496         vblank = I915_READ(vblank_reg);
 497
 498         vtotal = ((save_vtotal >> 16) & 0xfff) + 1;
 499         vactive = (save_vtotal & 0x7ff) + 1;
 500
 501         vblank_start = (vblank & 0xfff) + 1;
 502         vblank_end = ((vblank >> 16) & 0xfff) + 1;
 503
 504         /* Set the border color to purple. */
 505         I915_WRITE(bclrpat_reg, 0x500050);
 506
 507         if (!IS_GEN2(dev)) {
 508                 uint32_t pipeconf = I915_READ(pipeconf_reg);
 509                 I915_WRITE(pipeconf_reg, pipeconf | PIPECONF_FORCE_BORDER);
 510                 POSTING_READ(pipeconf_reg);
 511                 /* Wait for next Vblank to substitue
 512                  * border color for Color info */
 513                 intel_wait_for_vblank(dev, pipe);
 514                 st00 = I915_READ8(VGA_MSR_WRITE);
 515                 status = ((st00 & (1 << 4)) != 0) ?
 516                         connector_status_connected :
 517                         connector_status_disconnected;
 518
 519                 I915_WRITE(pipeconf_reg, pipeconf);
 520         } else {
 521                 bool restore_vblank = false;
 522                 int count, detect;
 523
 524                 /*
 525                 * If there isn't any border, add some.
 526                 * Yes, this will flicker
 527                 */
 528                 if (vblank_start <= vactive && vblank_end >= vtotal) {
 529                         uint32_t vsync = I915_READ(vsync_reg);
 530                         uint32_t vsync_start = (vsync & 0xffff) + 1;
 531
 532                         vblank_start = vsync_start;
 533                         I915_WRITE(vblank_reg,
 534                                    (vblank_start - 1) |
 535                                    ((vblank_end - 1) << 16));
 536                         restore_vblank = true;
 537                 }
 538                 /* sample in the vertical border, selecting the larger one */
 539                 if (vblank_start - vactive >= vtotal - vblank_end)
 540                         vsample = (vblank_start + vactive) >> 1;
 541                 else
 542                         vsample = (vtotal + vblank_end) >> 1;
 543
 544                 /*
 545                  * Wait for the border to be displayed
 546                  */
 547                 while (I915_READ(pipe_dsl_reg) >= vactive)
 548                         ;
 549                 while ((dsl = I915_READ(pipe_dsl_reg)) <= vsample)
 550                         ;
 551                 /*
 552                  * Watch ST00 for an entire scanline
 553                  */
 554                 detect = 0;
 555                 count = 0;
 556                 do {
 557                         count++;
 558                         /* Read the ST00 VGA status register */
 559                         st00 = I915_READ8(VGA_MSR_WRITE);
 560                         if (st00 & (1 << 4))
 561                                 detect++;
 562                 } while ((I915_READ(pipe_dsl_reg) == dsl));
 563
 564                 /* restore vblank if necessary */
 565                 if (restore_vblank)
 566                         I915_WRITE(vblank_reg, vblank);
 567                 /*
 568                  * If more than 3/4 of the scanline detected a monitor,
 569                  * then it is assumed to be present. This works even on i830,
 570                  * where there isn't any way to force the border color across
 571                  * the screen
 572                  */
 573                 status = detect * 4 > count * 3 ?
 574                          connector_status_connected :
 575                          connector_status_disconnected;
 576         }
 577
 578         /* Restore previous settings */
 579         I915_WRITE(bclrpat_reg, save_bclrpat);
 580
 581         return status;
 582 }
 583
 584 static enum drm_connector_status
 585 intel_crt_detect(struct drm_connector *connector, bool force)
 586 {
 587         struct drm_device *dev = connector->dev;
 588         struct intel_crt *crt = intel_attached_crt(connector);
 589         enum drm_connector_status status;
 590         struct intel_load_detect_pipe tmp;
 591
 592         if (I915_HAS_HOTPLUG(dev)) {
 593                 /* We can not rely on the HPD pin always being correctly wired
 594                  * up, for example many KVM do not pass it through, and so
 595                  * only trust an assertion that the monitor is connected.
 596                  */
 597                 if (intel_crt_detect_hotplug(connector)) {
 598                         DRM_DEBUG_KMS("CRT detected via hotplug\n");
 599                         return connector_status_connected;
 600                 } else
 601                         DRM_DEBUG_KMS("CRT not detected via hotplug\n");
 602         }
 603
 604         if (intel_crt_detect_ddc(connector))
 605                 return connector_status_connected;
 606
 607         /* Load detection is broken on HPD capable machines. Whoever wants a
 608          * broken monitor (without edid) to work behind a broken kvm (that fails
 609          * to have the right resistors for HP detection) needs to fix this up.
 610          * For now just bail out. */
 611         if (I915_HAS_HOTPLUG(dev))
 612                 return connector_status_disconnected;
 613
 614         if (!force)
 615                 return connector->status;
 616
 617         /* for pre-945g platforms use load detect */
 618         if (intel_get_load_detect_pipe(connector, NULL, &tmp)) {
 619                 if (intel_crt_detect_ddc(connector))
 620                         status = connector_status_connected;
 621                 else
 622                         status = intel_crt_load_detect(crt);
 623                 intel_release_load_detect_pipe(connector, &tmp);
 624         } else
 625                 status = connector_status_unknown;
 626
 627         return status;
 628 }
 629
 630 static void intel_crt_destroy(struct drm_connector *connector)
 631 {
 632         drm_sysfs_connector_remove(connector);
 633         drm_connector_cleanup(connector);
 634         kfree(connector);
 635 }
 636
 637 static int intel_crt_get_modes(struct drm_connector *connector)
 638 {
 639         struct drm_device *dev = connector->dev;
 640         struct drm_i915_private *dev_priv = dev->dev_private;
 641         int ret;
 642         struct i2c_adapter *i2c;
 643
 644         i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->crt_ddc_pin);
 645         ret = intel_crt_ddc_get_modes(connector, i2c);
 646         if (ret || !IS_G4X(dev))
 647                 return ret;
 648
 649         /* Try to probe digital port for output in DVI-I -> VGA mode. */
 650         i2c = intel_gmbus_get_adapter(dev_priv, GMBUS_PORT_DPB);
 651         return intel_crt_ddc_get_modes(connector, i2c);
 652 }
 653
 654 static int intel_crt_set_property(struct drm_connector *connector,
 655                                   struct drm_property *property,
 656                                   uint64_t value)
 657 {
 658         return 0;
 659 }
 660
 661 static void intel_crt_reset(struct drm_connector *connector)
 662 {
 663         struct drm_device *dev = connector->dev;
 664         struct drm_i915_private *dev_priv = dev->dev_private;
 665         struct intel_crt *crt = intel_attached_crt(connector);
 666
 667         if (HAS_PCH_SPLIT(dev)) {
 668                 u32 adpa;
 669
 670                 adpa = I915_READ(PCH_ADPA);
 671                 adpa &= ~ADPA_CRT_HOTPLUG_MASK;
 672                 adpa |= ADPA_HOTPLUG_BITS;
 673                 I915_WRITE(PCH_ADPA, adpa);
 674                 POSTING_READ(PCH_ADPA);
 675
 676                 DRM_DEBUG_KMS("pch crt adpa set to 0x%x\n", adpa);
 677                 crt->force_hotplug_required = 1;
 678         }
 679
 680 }
 681
 682 /*
 683  * Routines for controlling stuff on the analog port
 684  */
 685
 686 static const struct drm_encoder_helper_funcs crt_encoder_funcs = {
 687         .mode_fixup = intel_crt_mode_fixup,
 688         .mode_set = intel_crt_mode_set,
 689         .disable = intel_encoder_noop,
 690 };
 691
 692 static const struct drm_connector_funcs intel_crt_connector_funcs = {
 693         .reset = intel_crt_reset,
 694         .dpms = intel_crt_dpms,
 695         .detect = intel_crt_detect,
 696         .fill_modes = drm_helper_probe_single_connector_modes,
 697         .destroy = intel_crt_destroy,
 698         .set_property = intel_crt_set_property,
 699 };
 700
 701 static const struct drm_connector_helper_funcs intel_crt_connector_helper_funcs = {
 702         .mode_valid = intel_crt_mode_valid,
 703         .get_modes = intel_crt_get_modes,
 704         .best_encoder = intel_best_encoder,
 705 };
 706
 707 static const struct drm_encoder_funcs intel_crt_enc_funcs = {
 708         .destroy = intel_encoder_destroy,
 709 };
 710
 711 static int __init intel_no_crt_dmi_callback(const struct dmi_system_id *id)
 712 {
 713         DRM_INFO("Skipping CRT initialization for %s\n", id->ident);
 714         return 1;
 715 }
 716
 717 static const struct dmi_system_id intel_no_crt[] = {
 718         {
 719                 .callback = intel_no_crt_dmi_callback,
 720                 .ident = "ACER ZGB",
 721                 .matches = {
 722                         DMI_MATCH(DMI_SYS_VENDOR, "ACER"),
 723                         DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
 724                 },
 725         },
 726         { }
 727 };
 728
 729 void intel_crt_init(struct drm_device *dev)
 730 {
 731         struct drm_connector *connector;
 732         struct intel_crt *crt;
 733         struct intel_connector *intel_connector;
 734         struct drm_i915_private *dev_priv = dev->dev_private;
 735
 736         /* Skip machines without VGA that falsely report hotplug events */
 737         if (dmi_check_system(intel_no_crt))
 738                 return;
 739
 740         crt = kzalloc(sizeof(struct intel_crt), GFP_KERNEL);
 741         if (!crt)
 742                 return;
 743
 744         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
 745         if (!intel_connector) {
 746                 kfree(crt);
 747                 return;
 748         }
 749
 750         connector = &intel_connector->base;
 751         drm_connector_init(dev, &intel_connector->base,
 752                            &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);
 753
 754         drm_encoder_init(dev, &crt->base.base, &intel_crt_enc_funcs,
 755                          DRM_MODE_ENCODER_DAC);
 756
 757         intel_connector_attach_encoder(intel_connector, &crt->base);
 758
 759         crt->base.type = INTEL_OUTPUT_ANALOG;
 760         crt->base.cloneable = true;
 761         if (IS_HASWELL(dev))
 762                 crt->base.crtc_mask = (1 << 0);
 763         else
 764                 crt->base.crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
 765
 766         if (IS_GEN2(dev))
 767                 connector->interlace_allowed = 0;
 768         else
 769                 connector->interlace_allowed = 1;
 770         connector->doublescan_allowed = 0;
 771
 772         if (HAS_PCH_SPLIT(dev))
 773                 crt->adpa_reg = PCH_ADPA;
 774         else if (IS_VALLEYVIEW(dev))
 775                 crt->adpa_reg = VLV_ADPA;
 776         else
 777                 crt->adpa_reg = ADPA;
 778
 779         crt->base.disable = intel_disable_crt;
 780         crt->base.enable = intel_enable_crt;
 781         crt->base.get_hw_state = intel_crt_get_hw_state;
 782         intel_connector->get_hw_state = intel_connector_get_hw_state;
 783
 784         drm_encoder_helper_add(&crt->base.base, &crt_encoder_funcs);
 785         drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs);
 786
 787         drm_sysfs_connector_add(connector);
 788
 789         if (I915_HAS_HOTPLUG(dev))
 790                 connector->polled = DRM_CONNECTOR_POLL_HPD;
 791         else
 792                 connector->polled = DRM_CONNECTOR_POLL_CONNECT;
 793
 794         /*
 795          * Configure the automatic hotplug detection stuff
 796          */
 797         crt->force_hotplug_required = 0;
 798
 799         dev_priv->hotplug_supported_mask |= CRT_HOTPLUG_INT_STATUS;
 800 }