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 <[email protected]>
  25  */
  26
  27 #include <linux/dmi.h>
  28 #include <linux/i2c.h>
  29 #include <linux/slab.h>
  30 #include "drmP.h"
  31 #include "drm.h"
  32 #include "drm_crtc.h"
  33 #include "drm_crtc_helper.h"
  34 #include "drm_edid.h"
  35 #include "intel_drv.h"
  36 #include "i915_drm.h"
  37 #include "i915_drv.h"
  38
  39 /* Here's the desired hotplug mode */
  40 #define ADPA_HOTPLUG_BITS (ADPA_CRT_HOTPLUG_PERIOD_128 |                \
  41                            ADPA_CRT_HOTPLUG_WARMUP_10MS |               \
  42                            ADPA_CRT_HOTPLUG_SAMPLE_4S |                 \
  43                            ADPA_CRT_HOTPLUG_VOLTAGE_50 |                \
  44                            ADPA_CRT_HOTPLUG_VOLREF_325MV |              \
  45                            ADPA_CRT_HOTPLUG_ENABLE)
  46
  47 struct intel_crt {
  48         struct intel_encoder base;
  49         bool force_hotplug_required;
  50         u32 adpa_reg;
  51 };
  52
  53 static struct intel_crt *intel_attached_crt(struct drm_connector *connector)
  54 {
  55         return container_of(intel_attached_encoder(connector),
  56                             struct intel_crt, base);
  57 }
  58
  59 static struct intel_crt *intel_encoder_to_crt(struct intel_encoder *encoder)
  60 {
  61         return container_of(encoder, struct intel_crt, base);
  62 }
  63
  64 static bool intel_crt_get_hw_state(struct intel_encoder *encoder,
  65                                    enum pipe *pipe)
  66 {
  67         struct drm_device *dev = encoder->base.dev;
  68         struct drm_i915_private *dev_priv = dev->dev_private;
  69         struct intel_crt *crt = intel_encoder_to_crt(encoder);
  70         u32 tmp;
  71
  72         tmp = I915_READ(crt->adpa_reg);
  73
  74         if (!(tmp & ADPA_DAC_ENABLE))
  75                 return false;
  76
  77         if (HAS_PCH_CPT(dev))
  78                 *pipe = PORT_TO_PIPE_CPT(tmp);
  79         else
  80                 *pipe = PORT_TO_PIPE(tmp);
  81
  82         return true;
  83 }
  84
  85 static void intel_disable_crt(struct intel_encoder *encoder)
  86 {
  87         struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
  88         struct intel_crt *crt = intel_encoder_to_crt(encoder);
  89         u32 temp;
  90
  91         temp = I915_READ(crt->adpa_reg);
  92         temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
  93         temp &= ~ADPA_DAC_ENABLE;
  94         I915_WRITE(crt->adpa_reg, temp);
  95 }
  96
  97 static void intel_enable_crt(struct intel_encoder *encoder)
  98 {
  99         struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
 100         struct intel_crt *crt = intel_encoder_to_crt(encoder);
 101         u32 temp;
 102
 103         temp = I915_READ(crt->adpa_reg);
 104         temp |= ADPA_DAC_ENABLE;
 105         I915_WRITE(crt->adpa_reg, temp);
 106 }
 107
 108 /* Note: The caller is required to filter out dpms modes not supported by the
 109  * platform. */
 110 static void intel_crt_set_dpms(struct intel_encoder *encoder, int mode)
 111 {
 112         struct drm_device *dev = encoder->base.dev;
 113         struct drm_i915_private *dev_priv = dev->dev_private;
 114         struct intel_crt *crt = intel_encoder_to_crt(encoder);
 115         u32 temp;
 116
 117         temp = I915_READ(crt->adpa_reg);
 118         temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
 119         temp &= ~ADPA_DAC_ENABLE;
 120
 121         switch (mode) {
 122         case DRM_MODE_DPMS_ON:
 123                 temp |= ADPA_DAC_ENABLE;
 124                 break;
 125         case DRM_MODE_DPMS_STANDBY:
 126                 temp |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE;
 127                 break;
 128         case DRM_MODE_DPMS_SUSPEND:
 129                 temp |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE;
 130                 break;
 131         case DRM_MODE_DPMS_OFF:
 132                 temp |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE;
 133                 break;
 134         }
 135
 136         I915_WRITE(crt->adpa_reg, temp);
 137 }
 138
 139 static void intel_crt_dpms(struct drm_connector *connector, int mode)
 140 {
 141         struct drm_device *dev = connector->dev;
 142         struct intel_encoder *encoder = intel_attached_encoder(connector);
 143         struct drm_crtc *crtc;
 144         int old_dpms;
 145
 146         /* PCH platforms and VLV only support on/off. */
 147         if (INTEL_INFO(dev)->gen < 5 && mode != DRM_MODE_DPMS_ON)
 148                 mode = DRM_MODE_DPMS_OFF;
 149
 150         if (mode == connector->dpms)
 151                 return;
 152
 153         old_dpms = connector->dpms;
 154         connector->dpms = mode;
 155
 156         /* Only need to change hw state when actually enabled */
 157         crtc = encoder->base.crtc;
 158         if (!crtc) {
 159                 encoder->connectors_active = false;
 160                 return;
 161         }
 162
 163         /* We need the pipe to run for anything but OFF. */
 164         if (mode == DRM_MODE_DPMS_OFF)
 165                 encoder->connectors_active = false;
 166         else
 167                 encoder->connectors_active = true;
 168
 169         if (mode < old_dpms) {
 170                 /* From off to on, enable the pipe first. */
 171                 intel_crtc_update_dpms(crtc);
 172
 173                 intel_crt_set_dpms(encoder, mode);
 174         } else {
 175                 intel_crt_set_dpms(encoder, mode);
 176
 177                 intel_crtc_update_dpms(crtc);
 178         }
 179
 180         intel_modeset_check_state(connector->dev);
 181 }
 182
 183 static int intel_crt_mode_valid(struct drm_connector *connector,
 184                                 struct drm_display_mode *mode)
 185 {
 186         struct drm_device *dev = connector->dev;
 187
 188         int max_clock = 0;
 189         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 190                 return MODE_NO_DBLESCAN;
 191
 192         if (mode->clock < 25000)
 193                 return MODE_CLOCK_LOW;
 194
 195         if (IS_GEN2(dev))
 196                 max_clock = 350000;
 197         else
 198                 max_clock = 400000;
 199         if (mode->clock > max_clock)
 200                 return MODE_CLOCK_HIGH;
 201
 202         return MODE_OK;
 203 }
 204
 205 static bool intel_crt_mode_fixup(struct drm_encoder *encoder,
 206                                  const struct drm_display_mode *mode,
 207                                  struct drm_display_mode *adjusted_mode)
 208 {
 209         return true;
 210 }
 211
 212 static void intel_crt_mode_set(struct drm_encoder *encoder,
 213                                struct drm_display_mode *mode,
 214                                struct drm_display_mode *adjusted_mode)
 215 {
 216
 217         struct drm_device *dev = encoder->dev;
 218         struct drm_crtc *crtc = encoder->crtc;
 219         struct intel_crt *crt =
 220                 intel_encoder_to_crt(to_intel_encoder(encoder));
 221         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 222         struct drm_i915_private *dev_priv = dev->dev_private;
 223         int dpll_md_reg;
 224         u32 adpa, dpll_md;
 225
 226         dpll_md_reg = DPLL_MD(intel_crtc->pipe);
 227
 228         /*
 229          * Disable separate mode multiplier used when cloning SDVO to CRT
 230          * XXX this needs to be adjusted when we really are cloning
 231          */
 232         if (INTEL_INFO(dev)->gen >= 4 && !HAS_PCH_SPLIT(dev)) {
 233                 dpll_md = I915_READ(dpll_md_reg);
 234                 I915_WRITE(dpll_md_reg,
 235                            dpll_md & ~DPLL_MD_UDI_MULTIPLIER_MASK);
 236         }
 237
 238         if (HAS_PCH_SPLIT(dev))
 239                 adpa = ADPA_HOTPLUG_BITS;
 240         else
 241                 adpa = 0;
 242
 243         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 244                 adpa |= ADPA_HSYNC_ACTIVE_HIGH;
 245         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 246                 adpa |= ADPA_VSYNC_ACTIVE_HIGH;
 247
 248         /* For CPT allow 3 pipe config, for others just use A or B */
 249         if (HAS_PCH_CPT(dev))
 250                 adpa |= PORT_TRANS_SEL_CPT(intel_crtc->pipe);
 251         else if (intel_crtc->pipe == 0)
 252                 adpa |= ADPA_PIPE_A_SELECT;
 253         else
 254                 adpa |= ADPA_PIPE_B_SELECT;
 255
 256         if (!HAS_PCH_SPLIT(dev))
 257                 I915_WRITE(BCLRPAT(intel_crtc->pipe), 0);
 258
 259         I915_WRITE(crt->adpa_reg, adpa);
 260 }
 261
 262 static bool intel_ironlake_crt_detect_hotplug(struct drm_connector *connector)
 263 {
 264         struct drm_device *dev = connector->dev;
 265         struct intel_crt *crt = intel_attached_crt(connector);
 266         struct drm_i915_private *dev_priv = dev->dev_private;
 267         u32 adpa;
 268         bool ret;
 269
 270         /* The first time through, trigger an explicit detection cycle */
 271         if (crt->force_hotplug_required) {
 272                 bool turn_off_dac = HAS_PCH_SPLIT(dev);
 273                 u32 save_adpa;
 274
 275                 crt->force_hotplug_required = 0;
 276
 277                 save_adpa = adpa = I915_READ(PCH_ADPA);
 278                 DRM_DEBUG_KMS("trigger hotplug detect cycle: adpa=0x%x\n", adpa);
 279
 280                 adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
 281                 if (turn_off_dac)
 282                         adpa &= ~ADPA_DAC_ENABLE;
 283
 284                 I915_WRITE(PCH_ADPA, adpa);
 285
 286                 if (wait_for((I915_READ(PCH_ADPA) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) == 0,
 287                              1000))
 288                         DRM_DEBUG_KMS("timed out waiting for FORCE_TRIGGER");
 289
 290                 if (turn_off_dac) {
 291                         I915_WRITE(PCH_ADPA, save_adpa);
 292                         POSTING_READ(PCH_ADPA);
 293                 }
 294         }
 295
 296         /* Check the status to see if both blue and green are on now */
 297         adpa = I915_READ(PCH_ADPA);
 298         if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
 299                 ret = true;
 300         else
 301                 ret = false;
 302         DRM_DEBUG_KMS("ironlake hotplug adpa=0x%x, result %d\n", adpa, ret);
 303
 304         return ret;
 305 }
 306
 307 static bool valleyview_crt_detect_hotplug(struct drm_connector *connector)
 308 {
 309         struct drm_device *dev = connector->dev;
 310         struct drm_i915_private *dev_priv = dev->dev_private;
 311         u32 adpa;
 312         bool ret;
 313         u32 save_adpa;
 314
 315         save_adpa = adpa = I915_READ(ADPA);
 316         DRM_DEBUG_KMS("trigger hotplug detect cycle: adpa=0x%x\n", adpa);
 317
 318         adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
 319
 320         I915_WRITE(ADPA, adpa);
 321
 322         if (wait_for((I915_READ(ADPA) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) == 0,
 323                      1000)) {
 324                 DRM_DEBUG_KMS("timed out waiting for FORCE_TRIGGER");
 325                 I915_WRITE(ADPA, save_adpa);
 326         }
 327
 328         /* Check the status to see if both blue and green are on now */
 329         adpa = I915_READ(ADPA);
 330         if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
 331                 ret = true;
 332         else
 333                 ret = false;
 334
 335         DRM_DEBUG_KMS("valleyview hotplug adpa=0x%x, result %d\n", adpa, ret);
 336
 337         /* FIXME: debug force function and remove */
 338         ret = true;
 339
 340         return ret;
 341 }
 342
 343 /**
 344  * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect CRT presence.
 345  *
 346  * Not for i915G/i915GM
 347  *
 348  * \return true if CRT is connected.
 349  * \return false if CRT is disconnected.
 350  */
 351 static bool intel_crt_detect_hotplug(struct drm_connector *connector)
 352 {
 353         struct drm_device *dev = connector->dev;
 354         struct drm_i915_private *dev_priv = dev->dev_private;
 355         u32 hotplug_en, orig, stat;
 356         bool ret = false;
 357         int i, tries = 0;
 358
 359         if (HAS_PCH_SPLIT(dev))
 360                 return intel_ironlake_crt_detect_hotplug(connector);
 361
 362         if (IS_VALLEYVIEW(dev))
 363                 return valleyview_crt_detect_hotplug(connector);
 364
 365         /*
 366          * On 4 series desktop, CRT detect sequence need to be done twice
 367          * to get a reliable result.
 368          */
 369
 370         if (IS_G4X(dev) && !IS_GM45(dev))
 371                 tries = 2;
 372         else
 373                 tries = 1;
 374         hotplug_en = orig = I915_READ(PORT_HOTPLUG_EN);
 375         hotplug_en |= CRT_HOTPLUG_FORCE_DETECT;
 376
 377         for (i = 0; i < tries ; i++) {
 378                 /* turn on the FORCE_DETECT */
 379                 I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);
 380                 /* wait for FORCE_DETECT to go off */
 381                 if (wait_for((I915_READ(PORT_HOTPLUG_EN) &
 382                               CRT_HOTPLUG_FORCE_DETECT) == 0,
 383                              1000))
 384                         DRM_DEBUG_KMS("timed out waiting for FORCE_DETECT to go off");
 385         }
 386
 387         stat = I915_READ(PORT_HOTPLUG_STAT);
 388         if ((stat & CRT_HOTPLUG_MONITOR_MASK) != CRT_HOTPLUG_MONITOR_NONE)
 389                 ret = true;
 390
 391         /* clear the interrupt we just generated, if any */
 392         I915_WRITE(PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS);
 393
 394         /* and put the bits back */
 395         I915_WRITE(PORT_HOTPLUG_EN, orig);
 396
 397         return ret;
 398 }
 399
 400 static struct edid *intel_crt_get_edid(struct drm_connector *connector,
 401                                 struct i2c_adapter *i2c)
 402 {
 403         struct edid *edid;
 404
 405         edid = drm_get_edid(connector, i2c);
 406
 407         if (!edid && !intel_gmbus_is_forced_bit(i2c)) {
 408                 DRM_DEBUG_KMS("CRT GMBUS EDID read failed, retry using GPIO bit-banging\n");
 409                 intel_gmbus_force_bit(i2c, true);
 410                 edid = drm_get_edid(connector, i2c);
 411                 intel_gmbus_force_bit(i2c, false);
 412         }
 413
 414         return edid;
 415 }
 416
 417 /* local version of intel_ddc_get_modes() to use intel_crt_get_edid() */
 418 static int intel_crt_ddc_get_modes(struct drm_connector *connector,
 419                                 struct i2c_adapter *adapter)
 420 {
 421         struct edid *edid;
 422
 423         edid = intel_crt_get_edid(connector, adapter);
 424         if (!edid)
 425                 return 0;
 426
 427         return intel_connector_update_modes(connector, edid);
 428 }
 429
 430 static bool intel_crt_detect_ddc(struct drm_connector *connector)
 431 {
 432         struct intel_crt *crt = intel_attached_crt(connector);
 433         struct drm_i915_private *dev_priv = crt->base.base.dev->dev_private;
 434         struct edid *edid;
 435         struct i2c_adapter *i2c;
 436
 437         BUG_ON(crt->base.type != INTEL_OUTPUT_ANALOG);
 438
 439         i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->crt_ddc_pin);
 440         edid = intel_crt_get_edid(connector, i2c);
 441
 442         if (edid) {
 443                 bool is_digital = edid->input & DRM_EDID_INPUT_DIGITAL;
 444
 445                 /*
 446                  * This may be a DVI-I connector with a shared DDC
 447                  * link between analog and digital outputs, so we
 448                  * have to check the EDID input spec of the attached device.
 449                  */
 450                 if (!is_digital) {
 451                         DRM_DEBUG_KMS("CRT detected via DDC:0x50 [EDID]\n");
 452                         return true;
 453                 }
 454
 455                 DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [EDID reports a digital panel]\n");
 456         } else {
 457                 DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [no valid EDID found]\n");
 458         }
 459
 460         kfree(edid);
 461
 462         return false;
 463 }
 464
 465 static enum drm_connector_status
 466 intel_crt_load_detect(struct intel_crt *crt)
 467 {
 468         struct drm_device *dev = crt->base.base.dev;
 469         struct drm_i915_private *dev_priv = dev->dev_private;
 470         uint32_t pipe = to_intel_crtc(crt->base.base.crtc)->pipe;
 471         uint32_t save_bclrpat;
 472         uint32_t save_vtotal;
 473         uint32_t vtotal, vactive;
 474         uint32_t vsample;
 475         uint32_t vblank, vblank_start, vblank_end;
 476         uint32_t dsl;
 477         uint32_t bclrpat_reg;
 478         uint32_t vtotal_reg;
 479         uint32_t vblank_reg;
 480         uint32_t vsync_reg;
 481         uint32_t pipeconf_reg;
 482         uint32_t pipe_dsl_reg;
 483         uint8_t st00;
 484         enum drm_connector_status status;
 485
 486         DRM_DEBUG_KMS("starting load-detect on CRT\n");
 487
 488         bclrpat_reg = BCLRPAT(pipe);
 489         vtotal_reg = VTOTAL(pipe);
 490         vblank_reg = VBLANK(pipe);
 491         vsync_reg = VSYNC(pipe);
 492         pipeconf_reg = PIPECONF(pipe);
 493         pipe_dsl_reg = PIPEDSL(pipe);
 494
 495         save_bclrpat = I915_READ(bclrpat_reg);
 496         save_vtotal = I915_READ(vtotal_reg);
 497         vblank = I915_READ(vblank_reg);
 498
 499         vtotal = ((save_vtotal >> 16) & 0xfff) + 1;
 500         vactive = (save_vtotal & 0x7ff) + 1;
 501
 502         vblank_start = (vblank & 0xfff) + 1;
 503         vblank_end = ((vblank >> 16) & 0xfff) + 1;
 504
 505         /* Set the border color to purple. */
 506         I915_WRITE(bclrpat_reg, 0x500050);
 507
 508         if (!IS_GEN2(dev)) {
 509                 uint32_t pipeconf = I915_READ(pipeconf_reg);
 510                 I915_WRITE(pipeconf_reg, pipeconf | PIPECONF_FORCE_BORDER);
 511                 POSTING_READ(pipeconf_reg);
 512                 /* Wait for next Vblank to substitue
 513                  * border color for Color info */
 514                 intel_wait_for_vblank(dev, pipe);
 515                 st00 = I915_READ8(VGA_MSR_WRITE);
 516                 status = ((st00 & (1 << 4)) != 0) ?
 517                         connector_status_connected :
 518                         connector_status_disconnected;
 519
 520                 I915_WRITE(pipeconf_reg, pipeconf);
 521         } else {
 522                 bool restore_vblank = false;
 523                 int count, detect;
 524
 525                 /*
 526                 * If there isn't any border, add some.
 527                 * Yes, this will flicker
 528                 */
 529                 if (vblank_start <= vactive && vblank_end >= vtotal) {
 530                         uint32_t vsync = I915_READ(vsync_reg);
 531                         uint32_t vsync_start = (vsync & 0xffff) + 1;
 532
 533                         vblank_start = vsync_start;
 534                         I915_WRITE(vblank_reg,
 535                                    (vblank_start - 1) |
 536                                    ((vblank_end - 1) << 16));
 537                         restore_vblank = true;
 538                 }
 539                 /* sample in the vertical border, selecting the larger one */
 540                 if (vblank_start - vactive >= vtotal - vblank_end)
 541                         vsample = (vblank_start + vactive) >> 1;
 542                 else
 543                         vsample = (vtotal + vblank_end) >> 1;
 544
 545                 /*
 546                  * Wait for the border to be displayed
 547                  */
 548                 while (I915_READ(pipe_dsl_reg) >= vactive)
 549                         ;
 550                 while ((dsl = I915_READ(pipe_dsl_reg)) <= vsample)
 551                         ;
 552                 /*
 553                  * Watch ST00 for an entire scanline
 554                  */
 555                 detect = 0;
 556                 count = 0;
 557                 do {
 558                         count++;
 559                         /* Read the ST00 VGA status register */
 560                         st00 = I915_READ8(VGA_MSR_WRITE);
 561                         if (st00 & (1 << 4))
 562                                 detect++;
 563                 } while ((I915_READ(pipe_dsl_reg) == dsl));
 564
 565                 /* restore vblank if necessary */
 566                 if (restore_vblank)
 567                         I915_WRITE(vblank_reg, vblank);
 568                 /*
 569                  * If more than 3/4 of the scanline detected a monitor,
 570                  * then it is assumed to be present. This works even on i830,
 571                  * where there isn't any way to force the border color across
 572                  * the screen
 573                  */
 574                 status = detect * 4 > count * 3 ?
 575                          connector_status_connected :
 576                          connector_status_disconnected;
 577         }
 578
 579         /* Restore previous settings */
 580         I915_WRITE(bclrpat_reg, save_bclrpat);
 581
 582         return status;
 583 }
 584
 585 static enum drm_connector_status
 586 intel_crt_detect(struct drm_connector *connector, bool force)
 587 {
 588         struct drm_device *dev = connector->dev;
 589         struct intel_crt *crt = intel_attached_crt(connector);
 590         enum drm_connector_status status;
 591         struct intel_load_detect_pipe tmp;
 592
 593         if (I915_HAS_HOTPLUG(dev)) {
 594                 /* We can not rely on the HPD pin always being correctly wired
 595                  * up, for example many KVM do not pass it through, and so
 596                  * only trust an assertion that the monitor is connected.
 597                  */
 598                 if (intel_crt_detect_hotplug(connector)) {
 599                         DRM_DEBUG_KMS("CRT detected via hotplug\n");
 600                         return connector_status_connected;
 601                 } else
 602                         DRM_DEBUG_KMS("CRT not detected via hotplug\n");
 603         }
 604
 605         if (intel_crt_detect_ddc(connector))
 606                 return connector_status_connected;
 607
 608         /* Load detection is broken on HPD capable machines. Whoever wants a
 609          * broken monitor (without edid) to work behind a broken kvm (that fails
 610          * to have the right resistors for HP detection) needs to fix this up.
 611          * For now just bail out. */
 612         if (I915_HAS_HOTPLUG(dev))
 613                 return connector_status_disconnected;
 614
 615         if (!force)
 616                 return connector->status;
 617
 618         /* for pre-945g platforms use load detect */
 619         if (intel_get_load_detect_pipe(connector, NULL, &tmp)) {
 620                 if (intel_crt_detect_ddc(connector))
 621                         status = connector_status_connected;
 622                 else
 623                         status = intel_crt_load_detect(crt);
 624                 intel_release_load_detect_pipe(connector, &tmp);
 625         } else
 626                 status = connector_status_unknown;
 627
 628         return status;
 629 }
 630
 631 static void intel_crt_destroy(struct drm_connector *connector)
 632 {
 633         drm_sysfs_connector_remove(connector);
 634         drm_connector_cleanup(connector);
 635         kfree(connector);
 636 }
 637
 638 static int intel_crt_get_modes(struct drm_connector *connector)
 639 {
 640         struct drm_device *dev = connector->dev;
 641         struct drm_i915_private *dev_priv = dev->dev_private;
 642         int ret;
 643         struct i2c_adapter *i2c;
 644
 645         i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->crt_ddc_pin);
 646         ret = intel_crt_ddc_get_modes(connector, i2c);
 647         if (ret || !IS_G4X(dev))
 648                 return ret;
 649
 650         /* Try to probe digital port for output in DVI-I -> VGA mode. */
 651         i2c = intel_gmbus_get_adapter(dev_priv, GMBUS_PORT_DPB);
 652         return intel_crt_ddc_get_modes(connector, i2c);
 653 }
 654
 655 static int intel_crt_set_property(struct drm_connector *connector,
 656                                   struct drm_property *property,
 657                                   uint64_t value)
 658 {
 659         return 0;
 660 }
 661
 662 static void intel_crt_reset(struct drm_connector *connector)
 663 {
 664         struct drm_device *dev = connector->dev;
 665         struct drm_i915_private *dev_priv = dev->dev_private;
 666         struct intel_crt *crt = intel_attached_crt(connector);
 667
 668         if (HAS_PCH_SPLIT(dev)) {
 669                 u32 adpa;
 670
 671                 adpa = I915_READ(PCH_ADPA);
 672                 adpa &= ~ADPA_CRT_HOTPLUG_MASK;
 673                 adpa |= ADPA_HOTPLUG_BITS;
 674                 I915_WRITE(PCH_ADPA, adpa);
 675                 POSTING_READ(PCH_ADPA);
 676
 677                 DRM_DEBUG_KMS("pch crt adpa set to 0x%x\n", adpa);
 678                 crt->force_hotplug_required = 1;
 679         }
 680
 681 }
 682
 683 /*
 684  * Routines for controlling stuff on the analog port
 685  */
 686
 687 static const struct drm_encoder_helper_funcs crt_encoder_funcs = {
 688         .mode_fixup = intel_crt_mode_fixup,
 689         .mode_set = intel_crt_mode_set,
 690         .disable = intel_encoder_noop,
 691 };
 692
 693 static const struct drm_connector_funcs intel_crt_connector_funcs = {
 694         .reset = intel_crt_reset,
 695         .dpms = intel_crt_dpms,
 696         .detect = intel_crt_detect,
 697         .fill_modes = drm_helper_probe_single_connector_modes,
 698         .destroy = intel_crt_destroy,
 699         .set_property = intel_crt_set_property,
 700 };
 701
 702 static const struct drm_connector_helper_funcs intel_crt_connector_helper_funcs = {
 703         .mode_valid = intel_crt_mode_valid,
 704         .get_modes = intel_crt_get_modes,
 705         .best_encoder = intel_best_encoder,
 706 };
 707
 708 static const struct drm_encoder_funcs intel_crt_enc_funcs = {
 709         .destroy = intel_encoder_destroy,
 710 };
 711
 712 static int __init intel_no_crt_dmi_callback(const struct dmi_system_id *id)
 713 {
 714         DRM_INFO("Skipping CRT initialization for %s\n", id->ident);
 715         return 1;
 716 }
 717
 718 static const struct dmi_system_id intel_no_crt[] = {
 719         {
 720                 .callback = intel_no_crt_dmi_callback,
 721                 .ident = "ACER ZGB",
 722                 .matches = {
 723                         DMI_MATCH(DMI_SYS_VENDOR, "ACER"),
 724                         DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
 725                 },
 726         },
 727         { }
 728 };
 729
 730 void intel_crt_init(struct drm_device *dev)
 731 {
 732         struct drm_connector *connector;
 733         struct intel_crt *crt;
 734         struct intel_connector *intel_connector;
 735         struct drm_i915_private *dev_priv = dev->dev_private;
 736
 737         /* Skip machines without VGA that falsely report hotplug events */
 738         if (dmi_check_system(intel_no_crt))
 739                 return;
 740
 741         crt = kzalloc(sizeof(struct intel_crt), GFP_KERNEL);
 742         if (!crt)
 743                 return;
 744
 745         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
 746         if (!intel_connector) {
 747                 kfree(crt);
 748                 return;
 749         }
 750
 751         connector = &intel_connector->base;
 752         drm_connector_init(dev, &intel_connector->base,
 753                            &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);
 754
 755         drm_encoder_init(dev, &crt->base.base, &intel_crt_enc_funcs,
 756                          DRM_MODE_ENCODER_DAC);
 757
 758         intel_connector_attach_encoder(intel_connector, &crt->base);
 759
 760         crt->base.type = INTEL_OUTPUT_ANALOG;
 761         crt->base.cloneable = true;
 762         if (IS_HASWELL(dev))
 763                 crt->base.crtc_mask = (1 << 0);
 764         else
 765                 crt->base.crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
 766
 767         if (IS_GEN2(dev))
 768                 connector->interlace_allowed = 0;
 769         else
 770                 connector->interlace_allowed = 1;
 771         connector->doublescan_allowed = 0;
 772
 773         if (HAS_PCH_SPLIT(dev))
 774                 crt->adpa_reg = PCH_ADPA;
 775         else if (IS_VALLEYVIEW(dev))
 776                 crt->adpa_reg = VLV_ADPA;
 777         else
 778                 crt->adpa_reg = ADPA;
 779
 780         crt->base.disable = intel_disable_crt;
 781         crt->base.enable = intel_enable_crt;
 782         crt->base.get_hw_state = intel_crt_get_hw_state;
 783         intel_connector->get_hw_state = intel_connector_get_hw_state;
 784
 785         drm_encoder_helper_add(&crt->base.base, &crt_encoder_funcs);
 786         drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs);
 787
 788         drm_sysfs_connector_add(connector);
 789
 790         if (I915_HAS_HOTPLUG(dev))
 791                 connector->polled = DRM_CONNECTOR_POLL_HPD;
 792         else
 793                 connector->polled = DRM_CONNECTOR_POLL_CONNECT;
 794
 795         /*
 796          * Configure the automatic hotplug detection stuff
 797          */
 798         crt->force_hotplug_required = 0;
 799
 800         dev_priv->hotplug_supported_mask |= CRT_HOTPLUG_INT_STATUS;
 801 }