sys/dev/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 <drm/drmP.h>
  30 #include <drm/drm_atomic_helper.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         /* DPMS state is stored in the connector, which we need in the
  49          * encoder's enable/disable callbacks */
  50         struct intel_connector *connector;
  51         bool force_hotplug_required;
  52         u32 adpa_reg;
  53 };
  54
  55 static struct intel_crt *intel_encoder_to_crt(struct intel_encoder *encoder)
  56 {
  57         return container_of(encoder, struct intel_crt, base);
  58 }
  59
  60 static struct intel_crt *intel_attached_crt(struct drm_connector *connector)
  61 {
  62         return intel_encoder_to_crt(intel_attached_encoder(connector));
  63 }
  64
  65 static bool intel_crt_get_hw_state(struct intel_encoder *encoder,
  66                                    enum i915_pipe *pipe)
  67 {
  68         struct drm_device *dev = encoder->base.dev;
  69         struct drm_i915_private *dev_priv = dev->dev_private;
  70         struct intel_crt *crt = intel_encoder_to_crt(encoder);
  71         enum intel_display_power_domain power_domain;
  72         u32 tmp;
  73
  74         power_domain = intel_display_port_power_domain(encoder);
  75         if (!intel_display_power_is_enabled(dev_priv, power_domain))
  76                 return false;
  77
  78         tmp = I915_READ(crt->adpa_reg);
  79
  80         if (!(tmp & ADPA_DAC_ENABLE))
  81                 return false;
  82
  83         if (HAS_PCH_CPT(dev))
  84                 *pipe = PORT_TO_PIPE_CPT(tmp);
  85         else
  86                 *pipe = PORT_TO_PIPE(tmp);
  87
  88         return true;
  89 }
  90
  91 static unsigned int intel_crt_get_flags(struct intel_encoder *encoder)
  92 {
  93         struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
  94         struct intel_crt *crt = intel_encoder_to_crt(encoder);
  95         u32 tmp, flags = 0;
  96
  97         tmp = I915_READ(crt->adpa_reg);
  98
  99         if (tmp & ADPA_HSYNC_ACTIVE_HIGH)
 100                 flags |= DRM_MODE_FLAG_PHSYNC;
 101         else
 102                 flags |= DRM_MODE_FLAG_NHSYNC;
 103
 104         if (tmp & ADPA_VSYNC_ACTIVE_HIGH)
 105                 flags |= DRM_MODE_FLAG_PVSYNC;
 106         else
 107                 flags |= DRM_MODE_FLAG_NVSYNC;
 108
 109         return flags;
 110 }
 111
 112 static void intel_crt_get_config(struct intel_encoder *encoder,
 113                                  struct intel_crtc_state *pipe_config)
 114 {
 115         struct drm_device *dev = encoder->base.dev;
 116         int dotclock;
 117
 118         pipe_config->base.adjusted_mode.flags |= intel_crt_get_flags(encoder);
 119
 120         dotclock = pipe_config->port_clock;
 121
 122         if (HAS_PCH_SPLIT(dev))
 123                 ironlake_check_encoder_dotclock(pipe_config, dotclock);
 124
 125         pipe_config->base.adjusted_mode.crtc_clock = dotclock;
 126 }
 127
 128 static void hsw_crt_get_config(struct intel_encoder *encoder,
 129                                struct intel_crtc_state *pipe_config)
 130 {
 131         intel_ddi_get_config(encoder, pipe_config);
 132
 133         pipe_config->base.adjusted_mode.flags &= ~(DRM_MODE_FLAG_PHSYNC |
 134                                               DRM_MODE_FLAG_NHSYNC |
 135                                               DRM_MODE_FLAG_PVSYNC |
 136                                               DRM_MODE_FLAG_NVSYNC);
 137         pipe_config->base.adjusted_mode.flags |= intel_crt_get_flags(encoder);
 138 }
 139
 140 static void hsw_crt_pre_enable(struct intel_encoder *encoder)
 141 {
 142         struct drm_device *dev = encoder->base.dev;
 143         struct drm_i915_private *dev_priv = dev->dev_private;
 144
 145         WARN(I915_READ(SPLL_CTL) & SPLL_PLL_ENABLE, "SPLL already enabled\n");
 146         I915_WRITE(SPLL_CTL,
 147                    SPLL_PLL_ENABLE | SPLL_PLL_FREQ_1350MHz | SPLL_PLL_SSC);
 148         POSTING_READ(SPLL_CTL);
 149         udelay(20);
 150 }
 151
 152 /* Note: The caller is required to filter out dpms modes not supported by the
 153  * platform. */
 154 static void intel_crt_set_dpms(struct intel_encoder *encoder, int mode)
 155 {
 156         struct drm_device *dev = encoder->base.dev;
 157         struct drm_i915_private *dev_priv = dev->dev_private;
 158         struct intel_crt *crt = intel_encoder_to_crt(encoder);
 159         struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
 160         struct drm_display_mode *adjusted_mode = &crtc->config->base.adjusted_mode;
 161         u32 adpa;
 162
 163         if (INTEL_INFO(dev)->gen >= 5)
 164                 adpa = ADPA_HOTPLUG_BITS;
 165         else
 166                 adpa = 0;
 167
 168         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 169                 adpa |= ADPA_HSYNC_ACTIVE_HIGH;
 170         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 171                 adpa |= ADPA_VSYNC_ACTIVE_HIGH;
 172
 173         /* For CPT allow 3 pipe config, for others just use A or B */
 174         if (HAS_PCH_LPT(dev))
 175                 ; /* Those bits don't exist here */
 176         else if (HAS_PCH_CPT(dev))
 177                 adpa |= PORT_TRANS_SEL_CPT(crtc->pipe);
 178         else if (crtc->pipe == 0)
 179                 adpa |= ADPA_PIPE_A_SELECT;
 180         else
 181                 adpa |= ADPA_PIPE_B_SELECT;
 182
 183         if (!HAS_PCH_SPLIT(dev))
 184                 I915_WRITE(BCLRPAT(crtc->pipe), 0);
 185
 186         switch (mode) {
 187         case DRM_MODE_DPMS_ON:
 188                 adpa |= ADPA_DAC_ENABLE;
 189                 break;
 190         case DRM_MODE_DPMS_STANDBY:
 191                 adpa |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE;
 192                 break;
 193         case DRM_MODE_DPMS_SUSPEND:
 194                 adpa |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE;
 195                 break;
 196         case DRM_MODE_DPMS_OFF:
 197                 adpa |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE;
 198                 break;
 199         }
 200
 201         I915_WRITE(crt->adpa_reg, adpa);
 202 }
 203
 204 static void intel_disable_crt(struct intel_encoder *encoder)
 205 {
 206         intel_crt_set_dpms(encoder, DRM_MODE_DPMS_OFF);
 207 }
 208
 209
 210 static void hsw_crt_post_disable(struct intel_encoder *encoder)
 211 {
 212         struct drm_device *dev = encoder->base.dev;
 213         struct drm_i915_private *dev_priv = dev->dev_private;
 214         uint32_t val;
 215
 216         DRM_DEBUG_KMS("Disabling SPLL\n");
 217         val = I915_READ(SPLL_CTL);
 218         WARN_ON(!(val & SPLL_PLL_ENABLE));
 219         I915_WRITE(SPLL_CTL, val & ~SPLL_PLL_ENABLE);
 220         POSTING_READ(SPLL_CTL);
 221 }
 222
 223 static void intel_enable_crt(struct intel_encoder *encoder)
 224 {
 225         struct intel_crt *crt = intel_encoder_to_crt(encoder);
 226
 227         intel_crt_set_dpms(encoder, crt->connector->base.dpms);
 228 }
 229
 230 /* Special dpms function to support cloning between dvo/sdvo/crt. */
 231 static void intel_crt_dpms(struct drm_connector *connector, int mode)
 232 {
 233         struct drm_device *dev = connector->dev;
 234         struct intel_encoder *encoder = intel_attached_encoder(connector);
 235         struct drm_crtc *crtc;
 236         int old_dpms;
 237
 238         /* PCH platforms and VLV only support on/off. */
 239         if (INTEL_INFO(dev)->gen >= 5 && mode != DRM_MODE_DPMS_ON)
 240                 mode = DRM_MODE_DPMS_OFF;
 241
 242         if (mode == connector->dpms)
 243                 return;
 244
 245         old_dpms = connector->dpms;
 246         connector->dpms = mode;
 247
 248         /* Only need to change hw state when actually enabled */
 249         crtc = encoder->base.crtc;
 250         if (!crtc) {
 251                 encoder->connectors_active = false;
 252                 return;
 253         }
 254
 255         /* We need the pipe to run for anything but OFF. */
 256         if (mode == DRM_MODE_DPMS_OFF)
 257                 encoder->connectors_active = false;
 258         else
 259                 encoder->connectors_active = true;
 260
 261         /* We call connector dpms manually below in case pipe dpms doesn't
 262          * change due to cloning. */
 263         if (mode < old_dpms) {
 264                 /* From off to on, enable the pipe first. */
 265                 intel_crtc_update_dpms(crtc);
 266
 267                 intel_crt_set_dpms(encoder, mode);
 268         } else {
 269                 intel_crt_set_dpms(encoder, mode);
 270
 271                 intel_crtc_update_dpms(crtc);
 272         }
 273
 274         intel_modeset_check_state(connector->dev);
 275 }
 276
 277 static enum drm_mode_status
 278 intel_crt_mode_valid(struct drm_connector *connector,
 279                      struct drm_display_mode *mode)
 280 {
 281         struct drm_device *dev = connector->dev;
 282
 283         int max_clock = 0;
 284         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 285                 return MODE_NO_DBLESCAN;
 286
 287         if (mode->clock < 25000)
 288                 return MODE_CLOCK_LOW;
 289
 290         if (IS_GEN2(dev))
 291                 max_clock = 350000;
 292         else
 293                 max_clock = 400000;
 294         if (mode->clock > max_clock)
 295                 return MODE_CLOCK_HIGH;
 296
 297         /* The FDI receiver on LPT only supports 8bpc and only has 2 lanes. */
 298         if (HAS_PCH_LPT(dev) &&
 299             (ironlake_get_lanes_required(mode->clock, 270000, 24) > 2))
 300                 return MODE_CLOCK_HIGH;
 301
 302         return MODE_OK;
 303 }
 304
 305 static bool intel_crt_compute_config(struct intel_encoder *encoder,
 306                                      struct intel_crtc_state *pipe_config)
 307 {
 308         struct drm_device *dev = encoder->base.dev;
 309
 310         if (HAS_PCH_SPLIT(dev))
 311                 pipe_config->has_pch_encoder = true;
 312
 313         /* LPT FDI RX only supports 8bpc. */
 314         if (HAS_PCH_LPT(dev))
 315                 pipe_config->pipe_bpp = 24;
 316
 317         /* FDI must always be 2.7 GHz */
 318         if (HAS_DDI(dev)) {
 319                 pipe_config->ddi_pll_sel = PORT_CLK_SEL_SPLL;
 320                 pipe_config->port_clock = 135000 * 2;
 321         }
 322
 323         return true;
 324 }
 325
 326 static bool intel_ironlake_crt_detect_hotplug(struct drm_connector *connector)
 327 {
 328         struct drm_device *dev = connector->dev;
 329         struct intel_crt *crt = intel_attached_crt(connector);
 330         struct drm_i915_private *dev_priv = dev->dev_private;
 331         u32 adpa;
 332         bool ret;
 333
 334         /* The first time through, trigger an explicit detection cycle */
 335         if (crt->force_hotplug_required) {
 336                 bool turn_off_dac = HAS_PCH_SPLIT(dev);
 337                 u32 save_adpa;
 338
 339                 crt->force_hotplug_required = 0;
 340
 341                 save_adpa = adpa = I915_READ(crt->adpa_reg);
 342                 DRM_DEBUG_KMS("trigger hotplug detect cycle: adpa=0x%x\n", adpa);
 343
 344                 adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
 345                 if (turn_off_dac)
 346                         adpa &= ~ADPA_DAC_ENABLE;
 347
 348                 I915_WRITE(crt->adpa_reg, adpa);
 349
 350                 if (wait_for((I915_READ(crt->adpa_reg) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) == 0,
 351                              1000))
 352                         DRM_DEBUG_KMS("timed out waiting for FORCE_TRIGGER");
 353
 354                 if (turn_off_dac) {
 355                         I915_WRITE(crt->adpa_reg, save_adpa);
 356                         POSTING_READ(crt->adpa_reg);
 357                 }
 358         }
 359
 360         /* Check the status to see if both blue and green are on now */
 361         adpa = I915_READ(crt->adpa_reg);
 362         if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
 363                 ret = true;
 364         else
 365                 ret = false;
 366         DRM_DEBUG_KMS("ironlake hotplug adpa=0x%x, result %d\n", adpa, ret);
 367
 368         return ret;
 369 }
 370
 371 static bool valleyview_crt_detect_hotplug(struct drm_connector *connector)
 372 {
 373         struct drm_device *dev = connector->dev;
 374         struct intel_crt *crt = intel_attached_crt(connector);
 375         struct drm_i915_private *dev_priv = dev->dev_private;
 376         u32 adpa;
 377         bool ret;
 378         u32 save_adpa;
 379
 380         save_adpa = adpa = I915_READ(crt->adpa_reg);
 381         DRM_DEBUG_KMS("trigger hotplug detect cycle: adpa=0x%x\n", adpa);
 382
 383         adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
 384
 385         I915_WRITE(crt->adpa_reg, adpa);
 386
 387         if (wait_for((I915_READ(crt->adpa_reg) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) == 0,
 388                      1000)) {
 389                 DRM_DEBUG_KMS("timed out waiting for FORCE_TRIGGER");
 390                 I915_WRITE(crt->adpa_reg, save_adpa);
 391         }
 392
 393         /* Check the status to see if both blue and green are on now */
 394         adpa = I915_READ(crt->adpa_reg);
 395         if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
 396                 ret = true;
 397         else
 398                 ret = false;
 399
 400         DRM_DEBUG_KMS("valleyview hotplug adpa=0x%x, result %d\n", adpa, ret);
 401
 402         return ret;
 403 }
 404
 405 /**
 406  * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect CRT presence.
 407  *
 408  * Not for i915G/i915GM
 409  *
 410  * \return true if CRT is connected.
 411  * \return false if CRT is disconnected.
 412  */
 413 static bool intel_crt_detect_hotplug(struct drm_connector *connector)
 414 {
 415         struct drm_device *dev = connector->dev;
 416         struct drm_i915_private *dev_priv = dev->dev_private;
 417         u32 hotplug_en, orig, stat;
 418         bool ret = false;
 419         int i, tries = 0;
 420
 421         if (HAS_PCH_SPLIT(dev))
 422                 return intel_ironlake_crt_detect_hotplug(connector);
 423
 424         if (IS_VALLEYVIEW(dev))
 425                 return valleyview_crt_detect_hotplug(connector);
 426
 427         /*
 428          * On 4 series desktop, CRT detect sequence need to be done twice
 429          * to get a reliable result.
 430          */
 431
 432         if (IS_G4X(dev) && !IS_GM45(dev))
 433                 tries = 2;
 434         else
 435                 tries = 1;
 436         hotplug_en = orig = I915_READ(PORT_HOTPLUG_EN);
 437         hotplug_en |= CRT_HOTPLUG_FORCE_DETECT;
 438
 439         for (i = 0; i < tries ; i++) {
 440                 /* turn on the FORCE_DETECT */
 441                 I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);
 442                 /* wait for FORCE_DETECT to go off */
 443                 if (wait_for((I915_READ(PORT_HOTPLUG_EN) &
 444                               CRT_HOTPLUG_FORCE_DETECT) == 0,
 445                              1000))
 446                         DRM_DEBUG_KMS("timed out waiting for FORCE_DETECT to go off");
 447         }
 448
 449         stat = I915_READ(PORT_HOTPLUG_STAT);
 450         if ((stat & CRT_HOTPLUG_MONITOR_MASK) != CRT_HOTPLUG_MONITOR_NONE)
 451                 ret = true;
 452
 453         /* clear the interrupt we just generated, if any */
 454         I915_WRITE(PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS);
 455
 456         /* and put the bits back */
 457         I915_WRITE(PORT_HOTPLUG_EN, orig);
 458
 459         return ret;
 460 }
 461
 462 static struct edid *intel_crt_get_edid(struct drm_connector *connector,
 463                                 struct i2c_adapter *i2c)
 464 {
 465         struct edid *edid;
 466
 467         edid = drm_get_edid(connector, i2c);
 468
 469         if (!edid && !intel_gmbus_is_forced_bit(i2c)) {
 470                 DRM_DEBUG_KMS("CRT GMBUS EDID read failed, retry using GPIO bit-banging\n");
 471                 intel_gmbus_force_bit(i2c, true);
 472                 edid = drm_get_edid(connector, i2c);
 473                 intel_gmbus_force_bit(i2c, false);
 474         }
 475
 476         return edid;
 477 }
 478
 479 /* local version of intel_ddc_get_modes() to use intel_crt_get_edid() */
 480 static int intel_crt_ddc_get_modes(struct drm_connector *connector,
 481                                 struct i2c_adapter *adapter)
 482 {
 483         struct edid *edid;
 484         int ret;
 485
 486         edid = intel_crt_get_edid(connector, adapter);
 487         if (!edid)
 488                 return 0;
 489
 490         ret = intel_connector_update_modes(connector, edid);
 491         kfree(edid);
 492
 493         return ret;
 494 }
 495
 496 static bool intel_crt_detect_ddc(struct drm_connector *connector)
 497 {
 498         struct intel_crt *crt = intel_attached_crt(connector);
 499         struct drm_i915_private *dev_priv = crt->base.base.dev->dev_private;
 500         struct edid *edid;
 501         struct i2c_adapter *i2c;
 502
 503         BUG_ON(crt->base.type != INTEL_OUTPUT_ANALOG);
 504
 505         i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->vbt.crt_ddc_pin);
 506         edid = intel_crt_get_edid(connector, i2c);
 507
 508         if (edid) {
 509                 bool is_digital = edid->input & DRM_EDID_INPUT_DIGITAL;
 510
 511                 /*
 512                  * This may be a DVI-I connector with a shared DDC
 513                  * link between analog and digital outputs, so we
 514                  * have to check the EDID input spec of the attached device.
 515                  */
 516                 if (!is_digital) {
 517                         DRM_DEBUG_KMS("CRT detected via DDC:0x50 [EDID]\n");
 518                         return true;
 519                 }
 520
 521                 DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [EDID reports a digital panel]\n");
 522         } else {
 523                 DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [no valid EDID found]\n");
 524         }
 525
 526         kfree(edid);
 527
 528         return false;
 529 }
 530
 531 static enum drm_connector_status
 532 intel_crt_load_detect(struct intel_crt *crt)
 533 {
 534         struct drm_device *dev = crt->base.base.dev;
 535         struct drm_i915_private *dev_priv = dev->dev_private;
 536         uint32_t pipe = to_intel_crtc(crt->base.base.crtc)->pipe;
 537         uint32_t save_bclrpat;
 538         uint32_t save_vtotal;
 539         uint32_t vtotal, vactive;
 540         uint32_t vsample;
 541         uint32_t vblank, vblank_start, vblank_end;
 542         uint32_t dsl;
 543         uint32_t bclrpat_reg;
 544         uint32_t vtotal_reg;
 545         uint32_t vblank_reg;
 546         uint32_t vsync_reg;
 547         uint32_t pipeconf_reg;
 548         uint32_t pipe_dsl_reg;
 549         uint8_t st00;
 550         enum drm_connector_status status;
 551
 552         DRM_DEBUG_KMS("starting load-detect on CRT\n");
 553
 554         bclrpat_reg = BCLRPAT(pipe);
 555         vtotal_reg = VTOTAL(pipe);
 556         vblank_reg = VBLANK(pipe);
 557         vsync_reg = VSYNC(pipe);
 558         pipeconf_reg = PIPECONF(pipe);
 559         pipe_dsl_reg = PIPEDSL(pipe);
 560
 561         save_bclrpat = I915_READ(bclrpat_reg);
 562         save_vtotal = I915_READ(vtotal_reg);
 563         vblank = I915_READ(vblank_reg);
 564
 565         vtotal = ((save_vtotal >> 16) & 0xfff) + 1;
 566         vactive = (save_vtotal & 0x7ff) + 1;
 567
 568         vblank_start = (vblank & 0xfff) + 1;
 569         vblank_end = ((vblank >> 16) & 0xfff) + 1;
 570
 571         /* Set the border color to purple. */
 572         I915_WRITE(bclrpat_reg, 0x500050);
 573
 574         if (!IS_GEN2(dev)) {
 575                 uint32_t pipeconf = I915_READ(pipeconf_reg);
 576                 I915_WRITE(pipeconf_reg, pipeconf | PIPECONF_FORCE_BORDER);
 577                 POSTING_READ(pipeconf_reg);
 578                 /* Wait for next Vblank to substitue
 579                  * border color for Color info */
 580                 intel_wait_for_vblank(dev, pipe);
 581                 st00 = I915_READ8(VGA_MSR_WRITE);
 582                 status = ((st00 & (1 << 4)) != 0) ?
 583                         connector_status_connected :
 584                         connector_status_disconnected;
 585
 586                 I915_WRITE(pipeconf_reg, pipeconf);
 587         } else {
 588                 bool restore_vblank = false;
 589                 int count, detect;
 590
 591                 /*
 592                 * If there isn't any border, add some.
 593                 * Yes, this will flicker
 594                 */
 595                 if (vblank_start <= vactive && vblank_end >= vtotal) {
 596                         uint32_t vsync = I915_READ(vsync_reg);
 597                         uint32_t vsync_start = (vsync & 0xffff) + 1;
 598
 599                         vblank_start = vsync_start;
 600                         I915_WRITE(vblank_reg,
 601                                    (vblank_start - 1) |
 602                                    ((vblank_end - 1) << 16));
 603                         restore_vblank = true;
 604                 }
 605                 /* sample in the vertical border, selecting the larger one */
 606                 if (vblank_start - vactive >= vtotal - vblank_end)
 607                         vsample = (vblank_start + vactive) >> 1;
 608                 else
 609                         vsample = (vtotal + vblank_end) >> 1;
 610
 611                 /*
 612                  * Wait for the border to be displayed
 613                  */
 614                 while (I915_READ(pipe_dsl_reg) >= vactive)
 615                         ;
 616                 while ((dsl = I915_READ(pipe_dsl_reg)) <= vsample)
 617                         ;
 618                 /*
 619                  * Watch ST00 for an entire scanline
 620                  */
 621                 detect = 0;
 622                 count = 0;
 623                 do {
 624                         count++;
 625                         /* Read the ST00 VGA status register */
 626                         st00 = I915_READ8(VGA_MSR_WRITE);
 627                         if (st00 & (1 << 4))
 628                                 detect++;
 629                 } while ((I915_READ(pipe_dsl_reg) == dsl));
 630
 631                 /* restore vblank if necessary */
 632                 if (restore_vblank)
 633                         I915_WRITE(vblank_reg, vblank);
 634                 /*
 635                  * If more than 3/4 of the scanline detected a monitor,
 636                  * then it is assumed to be present. This works even on i830,
 637                  * where there isn't any way to force the border color across
 638                  * the screen
 639                  */
 640                 status = detect * 4 > count * 3 ?
 641                          connector_status_connected :
 642                          connector_status_disconnected;
 643         }
 644
 645         /* Restore previous settings */
 646         I915_WRITE(bclrpat_reg, save_bclrpat);
 647
 648         return status;
 649 }
 650
 651 static enum drm_connector_status
 652 intel_crt_detect(struct drm_connector *connector, bool force)
 653 {
 654         struct drm_device *dev = connector->dev;
 655         struct drm_i915_private *dev_priv = dev->dev_private;
 656         struct intel_crt *crt = intel_attached_crt(connector);
 657         struct intel_encoder *intel_encoder = &crt->base;
 658         enum intel_display_power_domain power_domain;
 659         enum drm_connector_status status;
 660         struct intel_load_detect_pipe tmp;
 661         struct drm_modeset_acquire_ctx ctx;
 662
 663         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force=%d\n",
 664                       connector->base.id, connector->name,
 665                       force);
 666
 667         power_domain = intel_display_port_power_domain(intel_encoder);
 668         intel_display_power_get(dev_priv, power_domain);
 669
 670         if (I915_HAS_HOTPLUG(dev)) {
 671                 /* We can not rely on the HPD pin always being correctly wired
 672                  * up, for example many KVM do not pass it through, and so
 673                  * only trust an assertion that the monitor is connected.
 674                  */
 675                 if (intel_crt_detect_hotplug(connector)) {
 676                         DRM_DEBUG_KMS("CRT detected via hotplug\n");
 677                         status = connector_status_connected;
 678                         goto out;
 679                 } else
 680                         DRM_DEBUG_KMS("CRT not detected via hotplug\n");
 681         }
 682
 683         if (intel_crt_detect_ddc(connector)) {
 684                 status = connector_status_connected;
 685                 goto out;
 686         }
 687
 688         /* Load detection is broken on HPD capable machines. Whoever wants a
 689          * broken monitor (without edid) to work behind a broken kvm (that fails
 690          * to have the right resistors for HP detection) needs to fix this up.
 691          * For now just bail out. */
 692         if (I915_HAS_HOTPLUG(dev) && !i915.load_detect_test) {
 693                 status = connector_status_disconnected;
 694                 goto out;
 695         }
 696
 697         if (!force) {
 698                 status = connector->status;
 699                 goto out;
 700         }
 701
 702         drm_modeset_acquire_init(&ctx, 0);
 703
 704         /* for pre-945g platforms use load detect */
 705         if (intel_get_load_detect_pipe(connector, NULL, &tmp, &ctx)) {
 706                 if (intel_crt_detect_ddc(connector))
 707                         status = connector_status_connected;
 708                 else if (INTEL_INFO(dev)->gen < 4)
 709                         status = intel_crt_load_detect(crt);
 710                 else
 711                         status = connector_status_unknown;
 712                 intel_release_load_detect_pipe(connector, &tmp, &ctx);
 713         } else
 714                 status = connector_status_unknown;
 715
 716         drm_modeset_drop_locks(&ctx);
 717         drm_modeset_acquire_fini(&ctx);
 718
 719 out:
 720         intel_display_power_put(dev_priv, power_domain);
 721         return status;
 722 }
 723
 724 static void intel_crt_destroy(struct drm_connector *connector)
 725 {
 726         drm_connector_cleanup(connector);
 727         kfree(connector);
 728 }
 729
 730 static int intel_crt_get_modes(struct drm_connector *connector)
 731 {
 732         struct drm_device *dev = connector->dev;
 733         struct drm_i915_private *dev_priv = dev->dev_private;
 734         struct intel_crt *crt = intel_attached_crt(connector);
 735         struct intel_encoder *intel_encoder = &crt->base;
 736         enum intel_display_power_domain power_domain;
 737         int ret;
 738         struct i2c_adapter *i2c;
 739
 740         power_domain = intel_display_port_power_domain(intel_encoder);
 741         intel_display_power_get(dev_priv, power_domain);
 742
 743         i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->vbt.crt_ddc_pin);
 744         ret = intel_crt_ddc_get_modes(connector, i2c);
 745         if (ret || !IS_G4X(dev))
 746                 goto out;
 747
 748         /* Try to probe digital port for output in DVI-I -> VGA mode. */
 749         i2c = intel_gmbus_get_adapter(dev_priv, GMBUS_PORT_DPB);
 750         ret = intel_crt_ddc_get_modes(connector, i2c);
 751
 752 out:
 753         intel_display_power_put(dev_priv, power_domain);
 754
 755         return ret;
 756 }
 757
 758 static int intel_crt_set_property(struct drm_connector *connector,
 759                                   struct drm_property *property,
 760                                   uint64_t value)
 761 {
 762         return 0;
 763 }
 764
 765 static void intel_crt_reset(struct drm_connector *connector)
 766 {
 767         struct drm_device *dev = connector->dev;
 768         struct drm_i915_private *dev_priv = dev->dev_private;
 769         struct intel_crt *crt = intel_attached_crt(connector);
 770
 771         if (INTEL_INFO(dev)->gen >= 5) {
 772                 u32 adpa;
 773
 774                 adpa = I915_READ(crt->adpa_reg);
 775                 adpa &= ~ADPA_CRT_HOTPLUG_MASK;
 776                 adpa |= ADPA_HOTPLUG_BITS;
 777                 I915_WRITE(crt->adpa_reg, adpa);
 778                 POSTING_READ(crt->adpa_reg);
 779
 780                 DRM_DEBUG_KMS("crt adpa set to 0x%x\n", adpa);
 781                 crt->force_hotplug_required = 1;
 782         }
 783
 784 }
 785
 786 /*
 787  * Routines for controlling stuff on the analog port
 788  */
 789
 790 static const struct drm_connector_funcs intel_crt_connector_funcs = {
 791         .reset = intel_crt_reset,
 792         .dpms = intel_crt_dpms,
 793         .detect = intel_crt_detect,
 794         .fill_modes = drm_helper_probe_single_connector_modes,
 795         .destroy = intel_crt_destroy,
 796         .set_property = intel_crt_set_property,
 797         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 798         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 799         .atomic_get_property = intel_connector_atomic_get_property,
 800 };
 801
 802 static const struct drm_connector_helper_funcs intel_crt_connector_helper_funcs = {
 803         .mode_valid = intel_crt_mode_valid,
 804         .get_modes = intel_crt_get_modes,
 805         .best_encoder = intel_best_encoder,
 806 };
 807
 808 static const struct drm_encoder_funcs intel_crt_enc_funcs = {
 809         .destroy = intel_encoder_destroy,
 810 };
 811
 812 static int intel_no_crt_dmi_callback(const struct dmi_system_id *id)
 813 {
 814         DRM_INFO("Skipping CRT initialization for %s\n", id->ident);
 815         return 1;
 816 }
 817
 818 static const struct dmi_system_id intel_no_crt[] = {
 819         {
 820                 .callback = intel_no_crt_dmi_callback,
 821                 .ident = "ACER ZGB",
 822                 .matches = {
 823                         DMI_MATCH(DMI_SYS_VENDOR, "ACER"),
 824                         DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
 825                 },
 826         },
 827         {
 828                 .callback = intel_no_crt_dmi_callback,
 829                 .ident = "DELL XPS 8700",
 830                 .matches = {
 831                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 832                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS 8700"),
 833                 },
 834         },
 835         { }
 836 };
 837
 838 void intel_crt_init(struct drm_device *dev)
 839 {
 840         struct drm_connector *connector;
 841         struct intel_crt *crt;
 842         struct intel_connector *intel_connector;
 843         struct drm_i915_private *dev_priv = dev->dev_private;
 844
 845         /* Skip machines without VGA that falsely report hotplug events */
 846         if (dmi_check_system(intel_no_crt))
 847                 return;
 848
 849         crt = kzalloc(sizeof(struct intel_crt), GFP_KERNEL);
 850         if (!crt)
 851                 return;
 852
 853         intel_connector = intel_connector_alloc();
 854         if (!intel_connector) {
 855                 kfree(crt);
 856                 return;
 857         }
 858
 859         connector = &intel_connector->base;
 860         crt->connector = intel_connector;
 861         drm_connector_init(dev, &intel_connector->base,
 862                            &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);
 863
 864         drm_encoder_init(dev, &crt->base.base, &intel_crt_enc_funcs,
 865                          DRM_MODE_ENCODER_DAC);
 866
 867         intel_connector_attach_encoder(intel_connector, &crt->base);
 868
 869         crt->base.type = INTEL_OUTPUT_ANALOG;
 870         crt->base.cloneable = (1 << INTEL_OUTPUT_DVO) | (1 << INTEL_OUTPUT_HDMI);
 871         if (IS_I830(dev))
 872                 crt->base.crtc_mask = (1 << 0);
 873         else
 874                 crt->base.crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
 875
 876         if (IS_GEN2(dev))
 877                 connector->interlace_allowed = 0;
 878         else
 879                 connector->interlace_allowed = 1;
 880         connector->doublescan_allowed = 0;
 881
 882         if (HAS_PCH_SPLIT(dev))
 883                 crt->adpa_reg = PCH_ADPA;
 884         else if (IS_VALLEYVIEW(dev))
 885                 crt->adpa_reg = VLV_ADPA;
 886         else
 887                 crt->adpa_reg = ADPA;
 888
 889         crt->base.compute_config = intel_crt_compute_config;
 890         crt->base.disable = intel_disable_crt;
 891         crt->base.enable = intel_enable_crt;
 892         if (I915_HAS_HOTPLUG(dev))
 893                 crt->base.hpd_pin = HPD_CRT;
 894         if (HAS_DDI(dev)) {
 895                 crt->base.get_config = hsw_crt_get_config;
 896                 crt->base.get_hw_state = intel_ddi_get_hw_state;
 897                 crt->base.pre_enable = hsw_crt_pre_enable;
 898                 crt->base.post_disable = hsw_crt_post_disable;
 899         } else {
 900                 crt->base.get_config = intel_crt_get_config;
 901                 crt->base.get_hw_state = intel_crt_get_hw_state;
 902         }
 903         intel_connector->get_hw_state = intel_connector_get_hw_state;
 904         intel_connector->unregister = intel_connector_unregister;
 905
 906         drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs);
 907
 908         drm_connector_register(connector);
 909
 910         if (!I915_HAS_HOTPLUG(dev))
 911                 intel_connector->polled = DRM_CONNECTOR_POLL_CONNECT;
 912
 913         /*
 914          * Configure the automatic hotplug detection stuff
 915          */
 916         crt->force_hotplug_required = 0;
 917
 918         /*
 919          * TODO: find a proper way to discover whether we need to set the the
 920          * polarity and link reversal bits or not, instead of relying on the
 921          * BIOS.
 922          */
 923         if (HAS_PCH_LPT(dev)) {
 924                 u32 fdi_config = FDI_RX_POLARITY_REVERSED_LPT |
 925                                  FDI_RX_LINK_REVERSAL_OVERRIDE;
 926
 927                 dev_priv->fdi_rx_config = I915_READ(_FDI_RXA_CTL) & fdi_config;
 928         }
 929
 930         intel_crt_reset(connector);
 931 }