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