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