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         i915_reg_t 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 = to_i915(dev);
  71         struct intel_crt *crt = intel_encoder_to_crt(encoder);
  72         enum intel_display_power_domain power_domain;
  73         u32 tmp;
  74         bool ret;
  75
  76         power_domain = intel_display_port_power_domain(encoder);
  77         if (!intel_display_power_get_if_enabled(dev_priv, power_domain))
  78                 return false;
  79
  80         ret = false;
  81
  82         tmp = I915_READ(crt->adpa_reg);
  83
  84         if (!(tmp & ADPA_DAC_ENABLE))
  85                 goto out;
  86
  87         if (HAS_PCH_CPT(dev))
  88                 *pipe = PORT_TO_PIPE_CPT(tmp);
  89         else
  90                 *pipe = PORT_TO_PIPE(tmp);
  91
  92         ret = true;
  93 out:
  94         intel_display_power_put(dev_priv, power_domain);
  95
  96         return ret;
  97 }
  98
  99 static unsigned int intel_crt_get_flags(struct intel_encoder *encoder)
 100 {
 101         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 102         struct intel_crt *crt = intel_encoder_to_crt(encoder);
 103         u32 tmp, flags = 0;
 104
 105         tmp = I915_READ(crt->adpa_reg);
 106
 107         if (tmp & ADPA_HSYNC_ACTIVE_HIGH)
 108                 flags |= DRM_MODE_FLAG_PHSYNC;
 109         else
 110                 flags |= DRM_MODE_FLAG_NHSYNC;
 111
 112         if (tmp & ADPA_VSYNC_ACTIVE_HIGH)
 113                 flags |= DRM_MODE_FLAG_PVSYNC;
 114         else
 115                 flags |= DRM_MODE_FLAG_NVSYNC;
 116
 117         return flags;
 118 }
 119
 120 static void intel_crt_get_config(struct intel_encoder *encoder,
 121                                  struct intel_crtc_state *pipe_config)
 122 {
 123         pipe_config->base.adjusted_mode.flags |= intel_crt_get_flags(encoder);
 124
 125         pipe_config->base.adjusted_mode.crtc_clock = pipe_config->port_clock;
 126 }
 127
 128 static void hsw_crt_get_config(struct intel_encoder *encoder,
 129                                struct intel_crtc_state *pipe_config)
 130 {
 131         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 132
 133         intel_ddi_get_config(encoder, pipe_config);
 134
 135         pipe_config->base.adjusted_mode.flags &= ~(DRM_MODE_FLAG_PHSYNC |
 136                                               DRM_MODE_FLAG_NHSYNC |
 137                                               DRM_MODE_FLAG_PVSYNC |
 138                                               DRM_MODE_FLAG_NVSYNC);
 139         pipe_config->base.adjusted_mode.flags |= intel_crt_get_flags(encoder);
 140
 141         pipe_config->base.adjusted_mode.crtc_clock = lpt_get_iclkip(dev_priv);
 142 }
 143
 144 /* Note: The caller is required to filter out dpms modes not supported by the
 145  * platform. */
 146 static void intel_crt_set_dpms(struct intel_encoder *encoder, int mode)
 147 {
 148         struct drm_device *dev = encoder->base.dev;
 149         struct drm_i915_private *dev_priv = to_i915(dev);
 150         struct intel_crt *crt = intel_encoder_to_crt(encoder);
 151         struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
 152         const struct drm_display_mode *adjusted_mode = &crtc->config->base.adjusted_mode;
 153         u32 adpa;
 154
 155         if (INTEL_INFO(dev)->gen >= 5)
 156                 adpa = ADPA_HOTPLUG_BITS;
 157         else
 158                 adpa = 0;
 159
 160         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 161                 adpa |= ADPA_HSYNC_ACTIVE_HIGH;
 162         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 163                 adpa |= ADPA_VSYNC_ACTIVE_HIGH;
 164
 165         /* For CPT allow 3 pipe config, for others just use A or B */
 166         if (HAS_PCH_LPT(dev))
 167                 ; /* Those bits don't exist here */
 168         else if (HAS_PCH_CPT(dev))
 169                 adpa |= PORT_TRANS_SEL_CPT(crtc->pipe);
 170         else if (crtc->pipe == 0)
 171                 adpa |= ADPA_PIPE_A_SELECT;
 172         else
 173                 adpa |= ADPA_PIPE_B_SELECT;
 174
 175         if (!HAS_PCH_SPLIT(dev))
 176                 I915_WRITE(BCLRPAT(crtc->pipe), 0);
 177
 178         switch (mode) {
 179         case DRM_MODE_DPMS_ON:
 180                 adpa |= ADPA_DAC_ENABLE;
 181                 break;
 182         case DRM_MODE_DPMS_STANDBY:
 183                 adpa |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE;
 184                 break;
 185         case DRM_MODE_DPMS_SUSPEND:
 186                 adpa |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE;
 187                 break;
 188         case DRM_MODE_DPMS_OFF:
 189                 adpa |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE;
 190                 break;
 191         }
 192
 193         I915_WRITE(crt->adpa_reg, adpa);
 194 }
 195
 196 static void intel_disable_crt(struct intel_encoder *encoder)
 197 {
 198         intel_crt_set_dpms(encoder, DRM_MODE_DPMS_OFF);
 199 }
 200
 201 static void pch_disable_crt(struct intel_encoder *encoder)
 202 {
 203 }
 204
 205 static void pch_post_disable_crt(struct intel_encoder *encoder)
 206 {
 207         intel_disable_crt(encoder);
 208 }
 209
 210 static void intel_enable_crt(struct intel_encoder *encoder)
 211 {
 212         intel_crt_set_dpms(encoder, DRM_MODE_DPMS_ON);
 213 }
 214
 215 static enum drm_mode_status
 216 intel_crt_mode_valid(struct drm_connector *connector,
 217                      struct drm_display_mode *mode)
 218 {
 219         struct drm_device *dev = connector->dev;
 220         int max_dotclk = to_i915(dev)->max_dotclk_freq;
 221         int max_clock;
 222
 223         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 224                 return MODE_NO_DBLESCAN;
 225
 226         if (mode->clock < 25000)
 227                 return MODE_CLOCK_LOW;
 228
 229         if (HAS_PCH_LPT(dev))
 230                 max_clock = 180000;
 231         else if (IS_VALLEYVIEW(dev))
 232                 /*
 233                  * 270 MHz due to current DPLL limits,
 234                  * DAC limit supposedly 355 MHz.
 235                  */
 236                 max_clock = 270000;
 237         else if (IS_GEN3(dev) || IS_GEN4(dev))
 238                 max_clock = 400000;
 239         else
 240                 max_clock = 350000;
 241         if (mode->clock > max_clock)
 242                 return MODE_CLOCK_HIGH;
 243
 244         if (mode->clock > max_dotclk)
 245                 return MODE_CLOCK_HIGH;
 246
 247         /* The FDI receiver on LPT only supports 8bpc and only has 2 lanes. */
 248         if (HAS_PCH_LPT(dev) &&
 249             (ironlake_get_lanes_required(mode->clock, 270000, 24) > 2))
 250                 return MODE_CLOCK_HIGH;
 251
 252         return MODE_OK;
 253 }
 254
 255 static bool intel_crt_compute_config(struct intel_encoder *encoder,
 256                                      struct intel_crtc_state *pipe_config)
 257 {
 258         struct drm_device *dev = encoder->base.dev;
 259
 260         if (HAS_PCH_SPLIT(dev))
 261                 pipe_config->has_pch_encoder = true;
 262
 263         /* LPT FDI RX only supports 8bpc. */
 264         if (HAS_PCH_LPT(dev)) {
 265                 if (pipe_config->bw_constrained && pipe_config->pipe_bpp < 24) {
 266                         DRM_DEBUG_KMS("LPT only supports 24bpp\n");
 267                         return false;
 268                 }
 269
 270                 pipe_config->pipe_bpp = 24;
 271         }
 272
 273         /* FDI must always be 2.7 GHz */
 274         if (HAS_DDI(dev))
 275                 pipe_config->port_clock = 135000 * 2;
 276
 277         return true;
 278 }
 279
 280 static bool intel_ironlake_crt_detect_hotplug(struct drm_connector *connector)
 281 {
 282         struct drm_device *dev = connector->dev;
 283         struct intel_crt *crt = intel_attached_crt(connector);
 284         struct drm_i915_private *dev_priv = to_i915(dev);
 285         u32 adpa;
 286         bool ret;
 287
 288         /* The first time through, trigger an explicit detection cycle */
 289         if (crt->force_hotplug_required) {
 290                 bool turn_off_dac = HAS_PCH_SPLIT(dev);
 291                 u32 save_adpa;
 292
 293                 crt->force_hotplug_required = 0;
 294
 295                 save_adpa = adpa = I915_READ(crt->adpa_reg);
 296                 DRM_DEBUG_KMS("trigger hotplug detect cycle: adpa=0x%x\n", adpa);
 297
 298                 adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
 299                 if (turn_off_dac)
 300                         adpa &= ~ADPA_DAC_ENABLE;
 301
 302                 I915_WRITE(crt->adpa_reg, adpa);
 303
 304                 if (intel_wait_for_register(dev_priv,
 305                                             crt->adpa_reg,
 306                                             ADPA_CRT_HOTPLUG_FORCE_TRIGGER, 0,
 307                                             1000))
 308                         DRM_DEBUG_KMS("timed out waiting for FORCE_TRIGGER");
 309
 310                 if (turn_off_dac) {
 311                         I915_WRITE(crt->adpa_reg, save_adpa);
 312                         POSTING_READ(crt->adpa_reg);
 313                 }
 314         }
 315
 316         /* Check the status to see if both blue and green are on now */
 317         adpa = I915_READ(crt->adpa_reg);
 318         if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
 319                 ret = true;
 320         else
 321                 ret = false;
 322         DRM_DEBUG_KMS("ironlake hotplug adpa=0x%x, result %d\n", adpa, ret);
 323
 324         return ret;
 325 }
 326
 327 static bool valleyview_crt_detect_hotplug(struct drm_connector *connector)
 328 {
 329         struct drm_device *dev = connector->dev;
 330         struct intel_crt *crt = intel_attached_crt(connector);
 331         struct drm_i915_private *dev_priv = to_i915(dev);
 332         bool reenable_hpd;
 333         u32 adpa;
 334         bool ret;
 335         u32 save_adpa;
 336
 337         /*
 338          * Doing a force trigger causes a hpd interrupt to get sent, which can
 339          * get us stuck in a loop if we're polling:
 340          *  - We enable power wells and reset the ADPA
 341          *  - output_poll_exec does force probe on VGA, triggering a hpd
 342          *  - HPD handler waits for poll to unlock dev->mode_config.mutex
 343          *  - output_poll_exec shuts off the ADPA, unlocks
 344          *    dev->mode_config.mutex
 345          *  - HPD handler runs, resets ADPA and brings us back to the start
 346          *
 347          * Just disable HPD interrupts here to prevent this
 348          */
 349         reenable_hpd = intel_hpd_disable(dev_priv, crt->base.hpd_pin);
 350
 351         save_adpa = adpa = I915_READ(crt->adpa_reg);
 352         DRM_DEBUG_KMS("trigger hotplug detect cycle: adpa=0x%x\n", adpa);
 353
 354         adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
 355
 356         I915_WRITE(crt->adpa_reg, adpa);
 357
 358         if (intel_wait_for_register(dev_priv,
 359                                     crt->adpa_reg,
 360                                     ADPA_CRT_HOTPLUG_FORCE_TRIGGER, 0,
 361                                     1000)) {
 362                 DRM_DEBUG_KMS("timed out waiting for FORCE_TRIGGER");
 363                 I915_WRITE(crt->adpa_reg, save_adpa);
 364         }
 365
 366         /* Check the status to see if both blue and green are on now */
 367         adpa = I915_READ(crt->adpa_reg);
 368         if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
 369                 ret = true;
 370         else
 371                 ret = false;
 372
 373         DRM_DEBUG_KMS("valleyview hotplug adpa=0x%x, result %d\n", adpa, ret);
 374
 375         if (reenable_hpd)
 376                 intel_hpd_enable(dev_priv, crt->base.hpd_pin);
 377
 378         return ret;
 379 }
 380
 381 /**
 382  * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect CRT presence.
 383  *
 384  * Not for i915G/i915GM
 385  *
 386  * \return true if CRT is connected.
 387  * \return false if CRT is disconnected.
 388  */
 389 static bool intel_crt_detect_hotplug(struct drm_connector *connector)
 390 {
 391         struct drm_device *dev = connector->dev;
 392         struct drm_i915_private *dev_priv = to_i915(dev);
 393         u32 stat;
 394         bool ret = false;
 395         int i, tries = 0;
 396
 397         if (HAS_PCH_SPLIT(dev))
 398                 return intel_ironlake_crt_detect_hotplug(connector);
 399
 400         if (IS_VALLEYVIEW(dev))
 401                 return valleyview_crt_detect_hotplug(connector);
 402
 403         /*
 404          * On 4 series desktop, CRT detect sequence need to be done twice
 405          * to get a reliable result.
 406          */
 407
 408         if (IS_G4X(dev) && !IS_GM45(dev))
 409                 tries = 2;
 410         else
 411                 tries = 1;
 412
 413         for (i = 0; i < tries ; i++) {
 414                 /* turn on the FORCE_DETECT */
 415                 i915_hotplug_interrupt_update(dev_priv,
 416                                               CRT_HOTPLUG_FORCE_DETECT,
 417                                               CRT_HOTPLUG_FORCE_DETECT);
 418                 /* wait for FORCE_DETECT to go off */
 419                 if (intel_wait_for_register(dev_priv, PORT_HOTPLUG_EN,
 420                                             CRT_HOTPLUG_FORCE_DETECT, 0,
 421                                             1000))
 422                         DRM_DEBUG_KMS("timed out waiting for FORCE_DETECT to go off");
 423         }
 424
 425         stat = I915_READ(PORT_HOTPLUG_STAT);
 426         if ((stat & CRT_HOTPLUG_MONITOR_MASK) != CRT_HOTPLUG_MONITOR_NONE)
 427                 ret = true;
 428
 429         /* clear the interrupt we just generated, if any */
 430         I915_WRITE(PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS);
 431
 432         i915_hotplug_interrupt_update(dev_priv, CRT_HOTPLUG_FORCE_DETECT, 0);
 433
 434         return ret;
 435 }
 436
 437 static struct edid *intel_crt_get_edid(struct drm_connector *connector,
 438                                 struct i2c_adapter *i2c)
 439 {
 440         struct edid *edid;
 441
 442         edid = drm_get_edid(connector, i2c);
 443
 444         if (!edid && !intel_gmbus_is_forced_bit(i2c)) {
 445                 DRM_DEBUG_KMS("CRT GMBUS EDID read failed, retry using GPIO bit-banging\n");
 446                 intel_gmbus_force_bit(i2c, true);
 447                 edid = drm_get_edid(connector, i2c);
 448                 intel_gmbus_force_bit(i2c, false);
 449         }
 450
 451         return edid;
 452 }
 453
 454 /* local version of intel_ddc_get_modes() to use intel_crt_get_edid() */
 455 static int intel_crt_ddc_get_modes(struct drm_connector *connector,
 456                                 struct i2c_adapter *adapter)
 457 {
 458         struct edid *edid;
 459         int ret;
 460
 461         edid = intel_crt_get_edid(connector, adapter);
 462         if (!edid)
 463                 return 0;
 464
 465         ret = intel_connector_update_modes(connector, edid);
 466         kfree(edid);
 467
 468         return ret;
 469 }
 470
 471 static bool intel_crt_detect_ddc(struct drm_connector *connector)
 472 {
 473         struct intel_crt *crt = intel_attached_crt(connector);
 474         struct drm_i915_private *dev_priv = to_i915(crt->base.base.dev);
 475         struct edid *edid;
 476         struct i2c_adapter *i2c;
 477
 478         BUG_ON(crt->base.type != INTEL_OUTPUT_ANALOG);
 479
 480         i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->vbt.crt_ddc_pin);
 481         edid = intel_crt_get_edid(connector, i2c);
 482
 483         if (edid) {
 484                 bool is_digital = edid->input & DRM_EDID_INPUT_DIGITAL;
 485
 486                 /*
 487                  * This may be a DVI-I connector with a shared DDC
 488                  * link between analog and digital outputs, so we
 489                  * have to check the EDID input spec of the attached device.
 490                  */
 491                 if (!is_digital) {
 492                         DRM_DEBUG_KMS("CRT detected via DDC:0x50 [EDID]\n");
 493                         return true;
 494                 }
 495
 496                 DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [EDID reports a digital panel]\n");
 497         } else {
 498                 DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [no valid EDID found]\n");
 499         }
 500
 501         kfree(edid);
 502
 503         return false;
 504 }
 505
 506 static enum drm_connector_status
 507 intel_crt_load_detect(struct intel_crt *crt, uint32_t pipe)
 508 {
 509         struct drm_device *dev = crt->base.base.dev;
 510         struct drm_i915_private *dev_priv = to_i915(dev);
 511         uint32_t save_bclrpat;
 512         uint32_t save_vtotal;
 513         uint32_t vtotal, vactive;
 514         uint32_t vsample;
 515         uint32_t vblank, vblank_start, vblank_end;
 516         uint32_t dsl;
 517         i915_reg_t bclrpat_reg, vtotal_reg,
 518                 vblank_reg, vsync_reg, pipeconf_reg, pipe_dsl_reg;
 519         uint8_t st00;
 520         enum drm_connector_status status;
 521
 522         DRM_DEBUG_KMS("starting load-detect on CRT\n");
 523
 524         bclrpat_reg = BCLRPAT(pipe);
 525         vtotal_reg = VTOTAL(pipe);
 526         vblank_reg = VBLANK(pipe);
 527         vsync_reg = VSYNC(pipe);
 528         pipeconf_reg = PIPECONF(pipe);
 529         pipe_dsl_reg = PIPEDSL(pipe);
 530
 531         save_bclrpat = I915_READ(bclrpat_reg);
 532         save_vtotal = I915_READ(vtotal_reg);
 533         vblank = I915_READ(vblank_reg);
 534
 535         vtotal = ((save_vtotal >> 16) & 0xfff) + 1;
 536         vactive = (save_vtotal & 0x7ff) + 1;
 537
 538         vblank_start = (vblank & 0xfff) + 1;
 539         vblank_end = ((vblank >> 16) & 0xfff) + 1;
 540
 541         /* Set the border color to purple. */
 542         I915_WRITE(bclrpat_reg, 0x500050);
 543
 544         if (!IS_GEN2(dev)) {
 545                 uint32_t pipeconf = I915_READ(pipeconf_reg);
 546                 I915_WRITE(pipeconf_reg, pipeconf | PIPECONF_FORCE_BORDER);
 547                 POSTING_READ(pipeconf_reg);
 548                 /* Wait for next Vblank to substitue
 549                  * border color for Color info */
 550                 intel_wait_for_vblank(dev, pipe);
 551                 st00 = I915_READ8(_VGA_MSR_WRITE);
 552                 status = ((st00 & (1 << 4)) != 0) ?
 553                         connector_status_connected :
 554                         connector_status_disconnected;
 555
 556                 I915_WRITE(pipeconf_reg, pipeconf);
 557         } else {
 558                 bool restore_vblank = false;
 559                 int count, detect;
 560
 561                 /*
 562                 * If there isn't any border, add some.
 563                 * Yes, this will flicker
 564                 */
 565                 if (vblank_start <= vactive && vblank_end >= vtotal) {
 566                         uint32_t vsync = I915_READ(vsync_reg);
 567                         uint32_t vsync_start = (vsync & 0xffff) + 1;
 568
 569                         vblank_start = vsync_start;
 570                         I915_WRITE(vblank_reg,
 571                                    (vblank_start - 1) |
 572                                    ((vblank_end - 1) << 16));
 573                         restore_vblank = true;
 574                 }
 575                 /* sample in the vertical border, selecting the larger one */
 576                 if (vblank_start - vactive >= vtotal - vblank_end)
 577                         vsample = (vblank_start + vactive) >> 1;
 578                 else
 579                         vsample = (vtotal + vblank_end) >> 1;
 580
 581                 /*
 582                  * Wait for the border to be displayed
 583                  */
 584                 while (I915_READ(pipe_dsl_reg) >= vactive)
 585                         ;
 586                 while ((dsl = I915_READ(pipe_dsl_reg)) <= vsample)
 587                         ;
 588                 /*
 589                  * Watch ST00 for an entire scanline
 590                  */
 591                 detect = 0;
 592                 count = 0;
 593                 do {
 594                         count++;
 595                         /* Read the ST00 VGA status register */
 596                         st00 = I915_READ8(_VGA_MSR_WRITE);
 597                         if (st00 & (1 << 4))
 598                                 detect++;
 599                 } while ((I915_READ(pipe_dsl_reg) == dsl));
 600
 601                 /* restore vblank if necessary */
 602                 if (restore_vblank)
 603                         I915_WRITE(vblank_reg, vblank);
 604                 /*
 605                  * If more than 3/4 of the scanline detected a monitor,
 606                  * then it is assumed to be present. This works even on i830,
 607                  * where there isn't any way to force the border color across
 608                  * the screen
 609                  */
 610                 status = detect * 4 > count * 3 ?
 611                          connector_status_connected :
 612                          connector_status_disconnected;
 613         }
 614
 615         /* Restore previous settings */
 616         I915_WRITE(bclrpat_reg, save_bclrpat);
 617
 618         return status;
 619 }
 620
 621 static enum drm_connector_status
 622 intel_crt_detect(struct drm_connector *connector, bool force)
 623 {
 624         struct drm_device *dev = connector->dev;
 625         struct drm_i915_private *dev_priv = to_i915(dev);
 626         struct intel_crt *crt = intel_attached_crt(connector);
 627         struct intel_encoder *intel_encoder = &crt->base;
 628         enum intel_display_power_domain power_domain;
 629         enum drm_connector_status status;
 630         struct intel_load_detect_pipe tmp;
 631         struct drm_modeset_acquire_ctx ctx;
 632
 633         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force=%d\n",
 634                       connector->base.id, connector->name,
 635                       force);
 636
 637         power_domain = intel_display_port_power_domain(intel_encoder);
 638         intel_display_power_get(dev_priv, power_domain);
 639
 640         if (I915_HAS_HOTPLUG(dev)) {
 641                 /* We can not rely on the HPD pin always being correctly wired
 642                  * up, for example many KVM do not pass it through, and so
 643                  * only trust an assertion that the monitor is connected.
 644                  */
 645                 if (intel_crt_detect_hotplug(connector)) {
 646                         DRM_DEBUG_KMS("CRT detected via hotplug\n");
 647                         status = connector_status_connected;
 648                         goto out;
 649                 } else
 650                         DRM_DEBUG_KMS("CRT not detected via hotplug\n");
 651         }
 652
 653         if (intel_crt_detect_ddc(connector)) {
 654                 status = connector_status_connected;
 655                 goto out;
 656         }
 657
 658         /* Load detection is broken on HPD capable machines. Whoever wants a
 659          * broken monitor (without edid) to work behind a broken kvm (that fails
 660          * to have the right resistors for HP detection) needs to fix this up.
 661          * For now just bail out. */
 662         if (I915_HAS_HOTPLUG(dev) && !i915.load_detect_test) {
 663                 status = connector_status_disconnected;
 664                 goto out;
 665         }
 666
 667         if (!force) {
 668                 status = connector->status;
 669                 goto out;
 670         }
 671
 672         drm_modeset_acquire_init(&ctx, 0);
 673
 674         /* for pre-945g platforms use load detect */
 675         if (intel_get_load_detect_pipe(connector, NULL, &tmp, &ctx)) {
 676                 if (intel_crt_detect_ddc(connector))
 677                         status = connector_status_connected;
 678                 else if (INTEL_INFO(dev)->gen < 4)
 679                         status = intel_crt_load_detect(crt,
 680                                 to_intel_crtc(connector->state->crtc)->pipe);
 681                 else if (i915.load_detect_test)
 682                         status = connector_status_disconnected;
 683                 else
 684                         status = connector_status_unknown;
 685                 intel_release_load_detect_pipe(connector, &tmp, &ctx);
 686         } else
 687                 status = connector_status_unknown;
 688
 689         drm_modeset_drop_locks(&ctx);
 690         drm_modeset_acquire_fini(&ctx);
 691
 692 out:
 693         intel_display_power_put(dev_priv, power_domain);
 694         return status;
 695 }
 696
 697 static void intel_crt_destroy(struct drm_connector *connector)
 698 {
 699         drm_connector_cleanup(connector);
 700         kfree(connector);
 701 }
 702
 703 static int intel_crt_get_modes(struct drm_connector *connector)
 704 {
 705         struct drm_device *dev = connector->dev;
 706         struct drm_i915_private *dev_priv = to_i915(dev);
 707         struct intel_crt *crt = intel_attached_crt(connector);
 708         struct intel_encoder *intel_encoder = &crt->base;
 709         enum intel_display_power_domain power_domain;
 710         int ret;
 711         struct i2c_adapter *i2c;
 712
 713         power_domain = intel_display_port_power_domain(intel_encoder);
 714         intel_display_power_get(dev_priv, power_domain);
 715
 716         i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->vbt.crt_ddc_pin);
 717         ret = intel_crt_ddc_get_modes(connector, i2c);
 718         if (ret || !IS_G4X(dev))
 719                 goto out;
 720
 721         /* Try to probe digital port for output in DVI-I -> VGA mode. */
 722         i2c = intel_gmbus_get_adapter(dev_priv, GMBUS_PIN_DPB);
 723         ret = intel_crt_ddc_get_modes(connector, i2c);
 724
 725 out:
 726         intel_display_power_put(dev_priv, power_domain);
 727
 728         return ret;
 729 }
 730
 731 static int intel_crt_set_property(struct drm_connector *connector,
 732                                   struct drm_property *property,
 733                                   uint64_t value)
 734 {
 735         return 0;
 736 }
 737
 738 void intel_crt_reset(struct drm_encoder *encoder)
 739 {
 740         struct drm_device *dev = encoder->dev;
 741         struct drm_i915_private *dev_priv = to_i915(dev);
 742         struct intel_crt *crt = intel_encoder_to_crt(to_intel_encoder(encoder));
 743
 744         if (INTEL_INFO(dev)->gen >= 5) {
 745                 u32 adpa;
 746
 747                 adpa = I915_READ(crt->adpa_reg);
 748                 adpa &= ~ADPA_CRT_HOTPLUG_MASK;
 749                 adpa |= ADPA_HOTPLUG_BITS;
 750                 I915_WRITE(crt->adpa_reg, adpa);
 751                 POSTING_READ(crt->adpa_reg);
 752
 753                 DRM_DEBUG_KMS("crt adpa set to 0x%x\n", adpa);
 754                 crt->force_hotplug_required = 1;
 755         }
 756
 757 }
 758
 759 /*
 760  * Routines for controlling stuff on the analog port
 761  */
 762
 763 static const struct drm_connector_funcs intel_crt_connector_funcs = {
 764         .dpms = drm_atomic_helper_connector_dpms,
 765         .detect = intel_crt_detect,
 766         .fill_modes = drm_helper_probe_single_connector_modes,
 767         .late_register = intel_connector_register,
 768         .early_unregister = intel_connector_unregister,
 769         .destroy = intel_crt_destroy,
 770         .set_property = intel_crt_set_property,
 771         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 772         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 773         .atomic_get_property = intel_connector_atomic_get_property,
 774 };
 775
 776 static const struct drm_connector_helper_funcs intel_crt_connector_helper_funcs = {
 777         .mode_valid = intel_crt_mode_valid,
 778         .get_modes = intel_crt_get_modes,
 779 };
 780
 781 static const struct drm_encoder_funcs intel_crt_enc_funcs = {
 782         .reset = intel_crt_reset,
 783         .destroy = intel_encoder_destroy,
 784 };
 785
 786 static int intel_no_crt_dmi_callback(const struct dmi_system_id *id)
 787 {
 788         DRM_INFO("Skipping CRT initialization for %s\n", id->ident);
 789         return 1;
 790 }
 791
 792 static const struct dmi_system_id intel_no_crt[] = {
 793         {
 794                 .callback = intel_no_crt_dmi_callback,
 795                 .ident = "ACER ZGB",
 796                 .matches = {
 797                         DMI_MATCH(DMI_SYS_VENDOR, "ACER"),
 798                         DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
 799                 },
 800         },
 801         {
 802                 .callback = intel_no_crt_dmi_callback,
 803                 .ident = "DELL XPS 8700",
 804                 .matches = {
 805                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 806                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS 8700"),
 807                 },
 808         },
 809         { }
 810 };
 811
 812 void intel_crt_init(struct drm_device *dev)
 813 {
 814         struct drm_connector *connector;
 815         struct intel_crt *crt;
 816         struct intel_connector *intel_connector;
 817         struct drm_i915_private *dev_priv = to_i915(dev);
 818         i915_reg_t adpa_reg;
 819         u32 adpa;
 820
 821         /* Skip machines without VGA that falsely report hotplug events */
 822         if (dmi_check_system(intel_no_crt))
 823                 return;
 824
 825         if (HAS_PCH_SPLIT(dev))
 826                 adpa_reg = PCH_ADPA;
 827         else if (IS_VALLEYVIEW(dev))
 828                 adpa_reg = VLV_ADPA;
 829         else
 830                 adpa_reg = ADPA;
 831
 832         adpa = I915_READ(adpa_reg);
 833         if ((adpa & ADPA_DAC_ENABLE) == 0) {
 834                 /*
 835                  * On some machines (some IVB at least) CRT can be
 836                  * fused off, but there's no known fuse bit to
 837                  * indicate that. On these machine the ADPA register
 838                  * works normally, except the DAC enable bit won't
 839                  * take. So the only way to tell is attempt to enable
 840                  * it and see what happens.
 841                  */
 842                 I915_WRITE(adpa_reg, adpa | ADPA_DAC_ENABLE |
 843                            ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
 844                 if ((I915_READ(adpa_reg) & ADPA_DAC_ENABLE) == 0)
 845                         return;
 846                 I915_WRITE(adpa_reg, adpa);
 847         }
 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, "CRT");
 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         crt->adpa_reg = adpa_reg;
 883
 884         crt->base.compute_config = intel_crt_compute_config;
 885         if (HAS_PCH_SPLIT(dev)) {
 886                 crt->base.disable = pch_disable_crt;
 887                 crt->base.post_disable = pch_post_disable_crt;
 888         } else {
 889                 crt->base.disable = intel_disable_crt;
 890         }
 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         } else {
 898                 crt->base.get_config = intel_crt_get_config;
 899                 crt->base.get_hw_state = intel_crt_get_hw_state;
 900         }
 901         intel_connector->get_hw_state = intel_connector_get_hw_state;
 902
 903         drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs);
 904
 905         if (!I915_HAS_HOTPLUG(dev))
 906                 intel_connector->polled = DRM_CONNECTOR_POLL_CONNECT;
 907
 908         /*
 909          * Configure the automatic hotplug detection stuff
 910          */
 911         crt->force_hotplug_required = 0;
 912
 913         /*
 914          * TODO: find a proper way to discover whether we need to set the the
 915          * polarity and link reversal bits or not, instead of relying on the
 916          * BIOS.
 917          */
 918         if (HAS_PCH_LPT(dev)) {
 919                 u32 fdi_config = FDI_RX_POLARITY_REVERSED_LPT |
 920                                  FDI_RX_LINK_REVERSAL_OVERRIDE;
 921
 922                 dev_priv->fdi_rx_config = I915_READ(FDI_RX_CTL(PIPE_A)) & fdi_config;
 923         }
 924
 925         intel_crt_reset(&crt->base.base);
 926 }