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