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_crtc.h>
  31 #include <drm/drm_crtc_helper.h>
  32 #include <drm/drm_edid.h>
  33 #include "intel_drv.h"
  34 #include <drm/i915_drm.h>
  35 #include "i915_drv.h"
  36
  37 /* Here's the desired hotplug mode */
  38 #define ADPA_HOTPLUG_BITS (ADPA_CRT_HOTPLUG_PERIOD_128 |                \
  39                            ADPA_CRT_HOTPLUG_WARMUP_10MS |               \
  40                            ADPA_CRT_HOTPLUG_SAMPLE_4S |                 \
  41                            ADPA_CRT_HOTPLUG_VOLTAGE_50 |                \
  42                            ADPA_CRT_HOTPLUG_VOLREF_325MV |              \
  43                            ADPA_CRT_HOTPLUG_ENABLE)
  44
  45 struct intel_crt {
  46         struct intel_encoder base;
  47         /* DPMS state is stored in the connector, which we need in the
  48          * encoder's enable/disable callbacks */
  49         struct intel_connector *connector;
  50         bool force_hotplug_required;
  51         u32 adpa_reg;
  52 };
  53
  54 static struct intel_crt *intel_encoder_to_crt(struct intel_encoder *encoder)
  55 {
  56         return container_of(encoder, struct intel_crt, base);
  57 }
  58
  59 static struct intel_crt *intel_attached_crt(struct drm_connector *connector)
  60 {
  61         return intel_encoder_to_crt(intel_attached_encoder(connector));
  62 }
  63
  64 static bool intel_crt_get_hw_state(struct intel_encoder *encoder,
  65                                    enum i915_pipe *pipe)
  66 {
  67         struct drm_device *dev = encoder->base.dev;
  68         struct drm_i915_private *dev_priv = dev->dev_private;
  69         struct intel_crt *crt = intel_encoder_to_crt(encoder);
  70         u32 tmp;
  71
  72         tmp = I915_READ(crt->adpa_reg);
  73
  74         if (!(tmp & ADPA_DAC_ENABLE))
  75                 return false;
  76
  77         if (HAS_PCH_CPT(dev))
  78                 *pipe = PORT_TO_PIPE_CPT(tmp);
  79         else
  80                 *pipe = PORT_TO_PIPE(tmp);
  81
  82         return true;
  83 }
  84
  85 static unsigned int intel_crt_get_flags(struct intel_encoder *encoder)
  86 {
  87         struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
  88         struct intel_crt *crt = intel_encoder_to_crt(encoder);
  89         u32 tmp, flags = 0;
  90
  91         tmp = I915_READ(crt->adpa_reg);
  92
  93         if (tmp & ADPA_HSYNC_ACTIVE_HIGH)
  94                 flags |= DRM_MODE_FLAG_PHSYNC;
  95         else
  96                 flags |= DRM_MODE_FLAG_NHSYNC;
  97
  98         if (tmp & ADPA_VSYNC_ACTIVE_HIGH)
  99                 flags |= DRM_MODE_FLAG_PVSYNC;
 100         else
 101                 flags |= DRM_MODE_FLAG_NVSYNC;
 102
 103         return flags;
 104 }
 105
 106 static void intel_crt_get_config(struct intel_encoder *encoder,
 107                                  struct intel_crtc_config *pipe_config)
 108 {
 109         struct drm_device *dev = encoder->base.dev;
 110         int dotclock;
 111
 112         pipe_config->adjusted_mode.flags |= intel_crt_get_flags(encoder);
 113
 114         dotclock = pipe_config->port_clock;
 115
 116         if (HAS_PCH_SPLIT(dev))
 117                 ironlake_check_encoder_dotclock(pipe_config, dotclock);
 118
 119         pipe_config->adjusted_mode.crtc_clock = dotclock;
 120 }
 121
 122 static void hsw_crt_get_config(struct intel_encoder *encoder,
 123                                struct intel_crtc_config *pipe_config)
 124 {
 125         intel_ddi_get_config(encoder, pipe_config);
 126
 127         pipe_config->adjusted_mode.flags &= ~(DRM_MODE_FLAG_PHSYNC |
 128                                               DRM_MODE_FLAG_NHSYNC |
 129                                               DRM_MODE_FLAG_PVSYNC |
 130                                               DRM_MODE_FLAG_NVSYNC);
 131         pipe_config->adjusted_mode.flags |= intel_crt_get_flags(encoder);
 132 }
 133
 134 /* Note: The caller is required to filter out dpms modes not supported by the
 135  * platform. */
 136 static void intel_crt_set_dpms(struct intel_encoder *encoder, int mode)
 137 {
 138         struct drm_device *dev = encoder->base.dev;
 139         struct drm_i915_private *dev_priv = dev->dev_private;
 140         struct intel_crt *crt = intel_encoder_to_crt(encoder);
 141         u32 temp;
 142
 143         temp = I915_READ(crt->adpa_reg);
 144         temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
 145         temp &= ~ADPA_DAC_ENABLE;
 146
 147         switch (mode) {
 148         case DRM_MODE_DPMS_ON:
 149                 temp |= ADPA_DAC_ENABLE;
 150                 break;
 151         case DRM_MODE_DPMS_STANDBY:
 152                 temp |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE;
 153                 break;
 154         case DRM_MODE_DPMS_SUSPEND:
 155                 temp |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE;
 156                 break;
 157         case DRM_MODE_DPMS_OFF:
 158                 temp |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE;
 159                 break;
 160         }
 161
 162         I915_WRITE(crt->adpa_reg, temp);
 163 }
 164
 165 static void intel_disable_crt(struct intel_encoder *encoder)
 166 {
 167         intel_crt_set_dpms(encoder, DRM_MODE_DPMS_OFF);
 168 }
 169
 170 static void intel_enable_crt(struct intel_encoder *encoder)
 171 {
 172         struct intel_crt *crt = intel_encoder_to_crt(encoder);
 173
 174         intel_crt_set_dpms(encoder, crt->connector->base.dpms);
 175 }
 176
 177 /* Special dpms function to support cloning between dvo/sdvo/crt. */
 178 static void intel_crt_dpms(struct drm_connector *connector, int mode)
 179 {
 180         struct drm_device *dev = connector->dev;
 181         struct intel_encoder *encoder = intel_attached_encoder(connector);
 182         struct drm_crtc *crtc;
 183         int old_dpms;
 184
 185         /* PCH platforms and VLV only support on/off. */
 186         if (INTEL_INFO(dev)->gen >= 5 && mode != DRM_MODE_DPMS_ON)
 187                 mode = DRM_MODE_DPMS_OFF;
 188
 189         if (mode == connector->dpms)
 190                 return;
 191
 192         old_dpms = connector->dpms;
 193         connector->dpms = mode;
 194
 195         /* Only need to change hw state when actually enabled */
 196         crtc = encoder->base.crtc;
 197         if (!crtc) {
 198                 encoder->connectors_active = false;
 199                 return;
 200         }
 201
 202         /* We need the pipe to run for anything but OFF. */
 203         if (mode == DRM_MODE_DPMS_OFF)
 204                 encoder->connectors_active = false;
 205         else
 206                 encoder->connectors_active = true;
 207
 208         /* We call connector dpms manually below in case pipe dpms doesn't
 209          * change due to cloning. */
 210         if (mode < old_dpms) {
 211                 /* From off to on, enable the pipe first. */
 212                 intel_crtc_update_dpms(crtc);
 213
 214                 intel_crt_set_dpms(encoder, mode);
 215         } else {
 216                 intel_crt_set_dpms(encoder, mode);
 217
 218                 intel_crtc_update_dpms(crtc);
 219         }
 220
 221         intel_modeset_check_state(connector->dev);
 222 }
 223
 224 static enum drm_mode_status
 225 intel_crt_mode_valid(struct drm_connector *connector,
 226                      struct drm_display_mode *mode)
 227 {
 228         struct drm_device *dev = connector->dev;
 229
 230         int max_clock = 0;
 231         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 232                 return MODE_NO_DBLESCAN;
 233
 234         if (mode->clock < 25000)
 235                 return MODE_CLOCK_LOW;
 236
 237         if (IS_GEN2(dev))
 238                 max_clock = 350000;
 239         else
 240                 max_clock = 400000;
 241         if (mode->clock > max_clock)
 242                 return MODE_CLOCK_HIGH;
 243
 244         /* The FDI receiver on LPT only supports 8bpc and only has 2 lanes. */
 245         if (HAS_PCH_LPT(dev) &&
 246             (ironlake_get_lanes_required(mode->clock, 270000, 24) > 2))
 247                 return MODE_CLOCK_HIGH;
 248
 249         return MODE_OK;
 250 }
 251
 252 static bool intel_crt_compute_config(struct intel_encoder *encoder,
 253                                      struct intel_crtc_config *pipe_config)
 254 {
 255         struct drm_device *dev = encoder->base.dev;
 256
 257         if (HAS_PCH_SPLIT(dev))
 258                 pipe_config->has_pch_encoder = true;
 259
 260         /* LPT FDI RX only supports 8bpc. */
 261         if (HAS_PCH_LPT(dev))
 262                 pipe_config->pipe_bpp = 24;
 263
 264         return true;
 265 }
 266
 267 static void intel_crt_mode_set(struct intel_encoder *encoder)
 268 {
 269
 270         struct drm_device *dev = encoder->base.dev;
 271         struct intel_crt *crt = intel_encoder_to_crt(encoder);
 272         struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
 273         struct drm_i915_private *dev_priv = dev->dev_private;
 274         struct drm_display_mode *adjusted_mode = &crtc->config.adjusted_mode;
 275         u32 adpa;
 276
 277         if (INTEL_INFO(dev)->gen >= 5)
 278                 adpa = ADPA_HOTPLUG_BITS;
 279         else
 280                 adpa = 0;
 281
 282         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 283                 adpa |= ADPA_HSYNC_ACTIVE_HIGH;
 284         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 285                 adpa |= ADPA_VSYNC_ACTIVE_HIGH;
 286
 287         /* For CPT allow 3 pipe config, for others just use A or B */
 288         if (HAS_PCH_LPT(dev))
 289                 ; /* Those bits don't exist here */
 290         else if (HAS_PCH_CPT(dev))
 291                 adpa |= PORT_TRANS_SEL_CPT(crtc->pipe);
 292         else if (crtc->pipe == 0)
 293                 adpa |= ADPA_PIPE_A_SELECT;
 294         else
 295                 adpa |= ADPA_PIPE_B_SELECT;
 296
 297         if (!HAS_PCH_SPLIT(dev))
 298                 I915_WRITE(BCLRPAT(crtc->pipe), 0);
 299
 300         I915_WRITE(crt->adpa_reg, adpa);
 301 }
 302
 303 static bool intel_ironlake_crt_detect_hotplug(struct drm_connector *connector)
 304 {
 305         struct drm_device *dev = connector->dev;
 306         struct intel_crt *crt = intel_attached_crt(connector);
 307         struct drm_i915_private *dev_priv = dev->dev_private;
 308         u32 adpa;
 309         bool ret;
 310
 311         /* The first time through, trigger an explicit detection cycle */
 312         if (crt->force_hotplug_required) {
 313                 bool turn_off_dac = HAS_PCH_SPLIT(dev);
 314                 u32 save_adpa;
 315
 316                 crt->force_hotplug_required = 0;
 317
 318                 save_adpa = adpa = I915_READ(crt->adpa_reg);
 319                 DRM_DEBUG_KMS("trigger hotplug detect cycle: adpa=0x%x\n", adpa);
 320
 321                 adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
 322                 if (turn_off_dac)
 323                         adpa &= ~ADPA_DAC_ENABLE;
 324
 325                 I915_WRITE(crt->adpa_reg, adpa);
 326
 327                 if (wait_for((I915_READ(crt->adpa_reg) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) == 0,
 328                              1000))
 329                         DRM_DEBUG_KMS("timed out waiting for FORCE_TRIGGER");
 330
 331                 if (turn_off_dac) {
 332                         I915_WRITE(crt->adpa_reg, save_adpa);
 333                         POSTING_READ(crt->adpa_reg);
 334                 }
 335         }
 336
 337         /* Check the status to see if both blue and green are on now */
 338         adpa = I915_READ(crt->adpa_reg);
 339         if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
 340                 ret = true;
 341         else
 342                 ret = false;
 343         DRM_DEBUG_KMS("ironlake hotplug adpa=0x%x, result %d\n", adpa, ret);
 344
 345         return ret;
 346 }
 347
 348 static bool valleyview_crt_detect_hotplug(struct drm_connector *connector)
 349 {
 350         struct drm_device *dev = connector->dev;
 351         struct intel_crt *crt = intel_attached_crt(connector);
 352         struct drm_i915_private *dev_priv = dev->dev_private;
 353         u32 adpa;
 354         bool ret;
 355         u32 save_adpa;
 356
 357         save_adpa = adpa = I915_READ(crt->adpa_reg);
 358         DRM_DEBUG_KMS("trigger hotplug detect cycle: adpa=0x%x\n", adpa);
 359
 360         adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
 361
 362         I915_WRITE(crt->adpa_reg, adpa);
 363
 364         if (wait_for((I915_READ(crt->adpa_reg) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) == 0,
 365                      1000)) {
 366                 DRM_DEBUG_KMS("timed out waiting for FORCE_TRIGGER");
 367                 I915_WRITE(crt->adpa_reg, save_adpa);
 368         }
 369
 370         /* Check the status to see if both blue and green are on now */
 371         adpa = I915_READ(crt->adpa_reg);
 372         if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
 373                 ret = true;
 374         else
 375                 ret = false;
 376
 377         DRM_DEBUG_KMS("valleyview hotplug adpa=0x%x, result %d\n", adpa, ret);
 378
 379         return ret;
 380 }
 381
 382 /**
 383  * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect CRT presence.
 384  *
 385  * Not for i915G/i915GM
 386  *
 387  * \return true if CRT is connected.
 388  * \return false if CRT is disconnected.
 389  */
 390 static bool intel_crt_detect_hotplug(struct drm_connector *connector)
 391 {
 392         struct drm_device *dev = connector->dev;
 393         struct drm_i915_private *dev_priv = dev->dev_private;
 394         u32 hotplug_en, orig, stat;
 395         bool ret = false;
 396         int i, tries = 0;
 397
 398         if (HAS_PCH_SPLIT(dev))
 399                 return intel_ironlake_crt_detect_hotplug(connector);
 400
 401         if (IS_VALLEYVIEW(dev))
 402                 return valleyview_crt_detect_hotplug(connector);
 403
 404         /*
 405          * On 4 series desktop, CRT detect sequence need to be done twice
 406          * to get a reliable result.
 407          */
 408
 409         if (IS_G4X(dev) && !IS_GM45(dev))
 410                 tries = 2;
 411         else
 412                 tries = 1;
 413         hotplug_en = orig = I915_READ(PORT_HOTPLUG_EN);
 414         hotplug_en |= CRT_HOTPLUG_FORCE_DETECT;
 415
 416         for (i = 0; i < tries ; i++) {
 417                 /* turn on the FORCE_DETECT */
 418                 I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);
 419                 /* wait for FORCE_DETECT to go off */
 420                 if (wait_for((I915_READ(PORT_HOTPLUG_EN) &
 421                               CRT_HOTPLUG_FORCE_DETECT) == 0,
 422                              1000))
 423                         DRM_DEBUG_KMS("timed out waiting for FORCE_DETECT to go off");
 424         }
 425
 426         stat = I915_READ(PORT_HOTPLUG_STAT);
 427         if ((stat & CRT_HOTPLUG_MONITOR_MASK) != CRT_HOTPLUG_MONITOR_NONE)
 428                 ret = true;
 429
 430         /* clear the interrupt we just generated, if any */
 431         I915_WRITE(PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS);
 432
 433         /* and put the bits back */
 434         I915_WRITE(PORT_HOTPLUG_EN, orig);
 435
 436         return ret;
 437 }
 438
 439 static struct edid *intel_crt_get_edid(struct drm_connector *connector,
 440                                 struct device *i2c)
 441 {
 442         struct edid *edid;
 443
 444         edid = drm_get_edid(connector, i2c);
 445
 446         if (!edid && !intel_gmbus_is_forced_bit(i2c)) {
 447                 DRM_DEBUG_KMS("CRT GMBUS EDID read failed, retry using GPIO bit-banging\n");
 448                 intel_gmbus_force_bit(i2c, true);
 449                 edid = drm_get_edid(connector, i2c);
 450                 intel_gmbus_force_bit(i2c, false);
 451         }
 452
 453         return edid;
 454 }
 455
 456 /* local version of intel_ddc_get_modes() to use intel_crt_get_edid() */
 457 static int intel_crt_ddc_get_modes(struct drm_connector *connector,
 458                                 struct device *adapter)
 459 {
 460         struct edid *edid;
 461         int ret;
 462
 463         edid = intel_crt_get_edid(connector, adapter);
 464         if (!edid)
 465                 return 0;
 466
 467         ret = intel_connector_update_modes(connector, edid);
 468         kfree(edid);
 469
 470         return ret;
 471 }
 472
 473 static bool intel_crt_detect_ddc(struct drm_connector *connector)
 474 {
 475         struct intel_crt *crt = intel_attached_crt(connector);
 476         struct drm_i915_private *dev_priv = crt->base.base.dev->dev_private;
 477         struct edid *edid;
 478         struct device *i2c;
 479
 480         BUG_ON(crt->base.type != INTEL_OUTPUT_ANALOG);
 481
 482         i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->vbt.crt_ddc_pin);
 483         edid = intel_crt_get_edid(connector, i2c);
 484
 485         if (edid) {
 486                 bool is_digital = edid->input & DRM_EDID_INPUT_DIGITAL;
 487
 488                 /*
 489                  * This may be a DVI-I connector with a shared DDC
 490                  * link between analog and digital outputs, so we
 491                  * have to check the EDID input spec of the attached device.
 492                  */
 493                 if (!is_digital) {
 494                         DRM_DEBUG_KMS("CRT detected via DDC:0x50 [EDID]\n");
 495                         return true;
 496                 }
 497
 498                 DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [EDID reports a digital panel]\n");
 499         } else {
 500                 DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [no valid EDID found]\n");
 501         }
 502
 503         kfree(edid);
 504
 505         return false;
 506 }
 507
 508 static enum drm_connector_status
 509 intel_crt_load_detect(struct intel_crt *crt)
 510 {
 511         struct drm_device *dev = crt->base.base.dev;
 512         struct drm_i915_private *dev_priv = dev->dev_private;
 513         uint32_t pipe = to_intel_crtc(crt->base.base.crtc)->pipe;
 514         uint32_t save_bclrpat;
 515         uint32_t save_vtotal;
 516         uint32_t vtotal, vactive;
 517         uint32_t vsample;
 518         uint32_t vblank, vblank_start, vblank_end;
 519         uint32_t dsl;
 520         uint32_t bclrpat_reg;
 521         uint32_t vtotal_reg;
 522         uint32_t vblank_reg;
 523         uint32_t vsync_reg;
 524         uint32_t pipeconf_reg;
 525         uint32_t pipe_dsl_reg;
 526         uint8_t st00;
 527         enum drm_connector_status status;
 528
 529         DRM_DEBUG_KMS("starting load-detect on CRT\n");
 530
 531         bclrpat_reg = BCLRPAT(pipe);
 532         vtotal_reg = VTOTAL(pipe);
 533         vblank_reg = VBLANK(pipe);
 534         vsync_reg = VSYNC(pipe);
 535         pipeconf_reg = PIPECONF(pipe);
 536         pipe_dsl_reg = PIPEDSL(pipe);
 537
 538         save_bclrpat = I915_READ(bclrpat_reg);
 539         save_vtotal = I915_READ(vtotal_reg);
 540         vblank = I915_READ(vblank_reg);
 541
 542         vtotal = ((save_vtotal >> 16) & 0xfff) + 1;
 543         vactive = (save_vtotal & 0x7ff) + 1;
 544
 545         vblank_start = (vblank & 0xfff) + 1;
 546         vblank_end = ((vblank >> 16) & 0xfff) + 1;
 547
 548         /* Set the border color to purple. */
 549         I915_WRITE(bclrpat_reg, 0x500050);
 550
 551         if (!IS_GEN2(dev)) {
 552                 uint32_t pipeconf = I915_READ(pipeconf_reg);
 553                 I915_WRITE(pipeconf_reg, pipeconf | PIPECONF_FORCE_BORDER);
 554                 POSTING_READ(pipeconf_reg);
 555                 /* Wait for next Vblank to substitue
 556                  * border color for Color info */
 557                 intel_wait_for_vblank(dev, pipe);
 558                 st00 = I915_READ8(VGA_MSR_WRITE);
 559                 status = ((st00 & (1 << 4)) != 0) ?
 560                         connector_status_connected :
 561                         connector_status_disconnected;
 562
 563                 I915_WRITE(pipeconf_reg, pipeconf);
 564         } else {
 565                 bool restore_vblank = false;
 566                 int count, detect;
 567
 568                 /*
 569                 * If there isn't any border, add some.
 570                 * Yes, this will flicker
 571                 */
 572                 if (vblank_start <= vactive && vblank_end >= vtotal) {
 573                         uint32_t vsync = I915_READ(vsync_reg);
 574                         uint32_t vsync_start = (vsync & 0xffff) + 1;
 575
 576                         vblank_start = vsync_start;
 577                         I915_WRITE(vblank_reg,
 578                                    (vblank_start - 1) |
 579                                    ((vblank_end - 1) << 16));
 580                         restore_vblank = true;
 581                 }
 582                 /* sample in the vertical border, selecting the larger one */
 583                 if (vblank_start - vactive >= vtotal - vblank_end)
 584                         vsample = (vblank_start + vactive) >> 1;
 585                 else
 586                         vsample = (vtotal + vblank_end) >> 1;
 587
 588                 /*
 589                  * Wait for the border to be displayed
 590                  */
 591                 while (I915_READ(pipe_dsl_reg) >= vactive)
 592                         ;
 593                 while ((dsl = I915_READ(pipe_dsl_reg)) <= vsample)
 594                         ;
 595                 /*
 596                  * Watch ST00 for an entire scanline
 597                  */
 598                 detect = 0;
 599                 count = 0;
 600                 do {
 601                         count++;
 602                         /* Read the ST00 VGA status register */
 603                         st00 = I915_READ8(VGA_MSR_WRITE);
 604                         if (st00 & (1 << 4))
 605                                 detect++;
 606                 } while ((I915_READ(pipe_dsl_reg) == dsl));
 607
 608                 /* restore vblank if necessary */
 609                 if (restore_vblank)
 610                         I915_WRITE(vblank_reg, vblank);
 611                 /*
 612                  * If more than 3/4 of the scanline detected a monitor,
 613                  * then it is assumed to be present. This works even on i830,
 614                  * where there isn't any way to force the border color across
 615                  * the screen
 616                  */
 617                 status = detect * 4 > count * 3 ?
 618                          connector_status_connected :
 619                          connector_status_disconnected;
 620         }
 621
 622         /* Restore previous settings */
 623         I915_WRITE(bclrpat_reg, save_bclrpat);
 624
 625         return status;
 626 }
 627
 628 static enum drm_connector_status
 629 intel_crt_detect(struct drm_connector *connector, bool force)
 630 {
 631         struct drm_device *dev = connector->dev;
 632         struct intel_crt *crt = intel_attached_crt(connector);
 633         enum drm_connector_status status;
 634         struct intel_load_detect_pipe tmp;
 635
 636         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force=%d\n",
 637                       connector->base.id, drm_get_connector_name(connector),
 638                       force);
 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                         return connector_status_connected;
 648                 } else
 649                         DRM_DEBUG_KMS("CRT not detected via hotplug\n");
 650         }
 651
 652         if (intel_crt_detect_ddc(connector))
 653                 return connector_status_connected;
 654
 655         /* Load detection is broken on HPD capable machines. Whoever wants a
 656          * broken monitor (without edid) to work behind a broken kvm (that fails
 657          * to have the right resistors for HP detection) needs to fix this up.
 658          * For now just bail out. */
 659         if (I915_HAS_HOTPLUG(dev))
 660                 return connector_status_disconnected;
 661
 662         if (!force)
 663                 return connector->status;
 664
 665         /* for pre-945g platforms use load detect */
 666         if (intel_get_load_detect_pipe(connector, NULL, &tmp)) {
 667                 if (intel_crt_detect_ddc(connector))
 668                         status = connector_status_connected;
 669                 else
 670                         status = intel_crt_load_detect(crt);
 671                 intel_release_load_detect_pipe(connector, &tmp);
 672         } else
 673                 status = connector_status_unknown;
 674
 675         return status;
 676 }
 677
 678 static void intel_crt_destroy(struct drm_connector *connector)
 679 {
 680         drm_connector_cleanup(connector);
 681         kfree(connector);
 682 }
 683
 684 static int intel_crt_get_modes(struct drm_connector *connector)
 685 {
 686         struct drm_device *dev = connector->dev;
 687         struct drm_i915_private *dev_priv = dev->dev_private;
 688         int ret;
 689         struct device *i2c;
 690
 691         i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->vbt.crt_ddc_pin);
 692         ret = intel_crt_ddc_get_modes(connector, i2c);
 693         if (ret || !IS_G4X(dev))
 694                 return ret;
 695
 696         /* Try to probe digital port for output in DVI-I -> VGA mode. */
 697         i2c = intel_gmbus_get_adapter(dev_priv, GMBUS_PORT_DPB);
 698         return intel_crt_ddc_get_modes(connector, i2c);
 699 }
 700
 701 static int intel_crt_set_property(struct drm_connector *connector,
 702                                   struct drm_property *property,
 703                                   uint64_t value)
 704 {
 705         return 0;
 706 }
 707
 708 static void intel_crt_reset(struct drm_connector *connector)
 709 {
 710         struct drm_device *dev = connector->dev;
 711         struct drm_i915_private *dev_priv = dev->dev_private;
 712         struct intel_crt *crt = intel_attached_crt(connector);
 713
 714         if (INTEL_INFO(dev)->gen >= 5) {
 715                 u32 adpa;
 716
 717                 adpa = I915_READ(crt->adpa_reg);
 718                 adpa &= ~ADPA_CRT_HOTPLUG_MASK;
 719                 adpa |= ADPA_HOTPLUG_BITS;
 720                 I915_WRITE(crt->adpa_reg, adpa);
 721                 POSTING_READ(crt->adpa_reg);
 722
 723                 DRM_DEBUG_KMS("pch crt adpa set to 0x%x\n", adpa);
 724                 crt->force_hotplug_required = 1;
 725         }
 726
 727 }
 728
 729 /*
 730  * Routines for controlling stuff on the analog port
 731  */
 732
 733 static const struct drm_connector_funcs intel_crt_connector_funcs = {
 734         .reset = intel_crt_reset,
 735         .dpms = intel_crt_dpms,
 736         .detect = intel_crt_detect,
 737         .fill_modes = drm_helper_probe_single_connector_modes,
 738         .destroy = intel_crt_destroy,
 739         .set_property = intel_crt_set_property,
 740 };
 741
 742 static const struct drm_connector_helper_funcs intel_crt_connector_helper_funcs = {
 743         .mode_valid = intel_crt_mode_valid,
 744         .get_modes = intel_crt_get_modes,
 745         .best_encoder = intel_best_encoder,
 746 };
 747
 748 static const struct drm_encoder_funcs intel_crt_enc_funcs = {
 749         .destroy = intel_encoder_destroy,
 750 };
 751
 752 static int __init intel_no_crt_dmi_callback(const struct dmi_system_id *id)
 753 {
 754         DRM_INFO("Skipping CRT initialization for %s\n", id->ident);
 755         return 1;
 756 }
 757
 758 static const struct dmi_system_id intel_no_crt[] = {
 759         {
 760                 .callback = intel_no_crt_dmi_callback,
 761                 .ident = "ACER ZGB",
 762                 .matches = {
 763                         DMI_MATCH(DMI_SYS_VENDOR, "ACER"),
 764                         DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
 765                 },
 766         },
 767         { }
 768 };
 769
 770 void intel_crt_init(struct drm_device *dev)
 771 {
 772         struct drm_connector *connector;
 773         struct intel_crt *crt;
 774         struct intel_connector *intel_connector;
 775         struct drm_i915_private *dev_priv = dev->dev_private;
 776
 777         /* Skip machines without VGA that falsely report hotplug events */
 778         if (dmi_check_system(intel_no_crt))
 779                 return;
 780
 781         crt = kzalloc(sizeof(struct intel_crt), GFP_KERNEL);
 782         if (!crt)
 783                 return;
 784
 785         intel_connector = kzalloc(sizeof(*intel_connector), GFP_KERNEL);
 786         if (!intel_connector) {
 787                 kfree(crt);
 788                 return;
 789         }
 790
 791         connector = &intel_connector->base;
 792         crt->connector = intel_connector;
 793         drm_connector_init(dev, &intel_connector->base,
 794                            &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);
 795
 796         drm_encoder_init(dev, &crt->base.base, &intel_crt_enc_funcs,
 797                          DRM_MODE_ENCODER_DAC);
 798
 799         intel_connector_attach_encoder(intel_connector, &crt->base);
 800
 801         crt->base.type = INTEL_OUTPUT_ANALOG;
 802         crt->base.cloneable = true;
 803         if (IS_I830(dev))
 804                 crt->base.crtc_mask = (1 << 0);
 805         else
 806                 crt->base.crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
 807
 808         if (IS_GEN2(dev))
 809                 connector->interlace_allowed = 0;
 810         else
 811                 connector->interlace_allowed = 1;
 812         connector->doublescan_allowed = 0;
 813
 814         if (HAS_PCH_SPLIT(dev))
 815                 crt->adpa_reg = PCH_ADPA;
 816         else if (IS_VALLEYVIEW(dev))
 817                 crt->adpa_reg = VLV_ADPA;
 818         else
 819                 crt->adpa_reg = ADPA;
 820
 821         crt->base.compute_config = intel_crt_compute_config;
 822         crt->base.mode_set = intel_crt_mode_set;
 823         crt->base.disable = intel_disable_crt;
 824         crt->base.enable = intel_enable_crt;
 825         if (I915_HAS_HOTPLUG(dev))
 826                 crt->base.hpd_pin = HPD_CRT;
 827         if (HAS_DDI(dev)) {
 828                 crt->base.get_config = hsw_crt_get_config;
 829                 crt->base.get_hw_state = intel_ddi_get_hw_state;
 830         } else {
 831                 crt->base.get_config = intel_crt_get_config;
 832                 crt->base.get_hw_state = intel_crt_get_hw_state;
 833         }
 834         intel_connector->get_hw_state = intel_connector_get_hw_state;
 835
 836         drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs);
 837
 838         drm_sysfs_connector_add(connector);
 839
 840         if (!I915_HAS_HOTPLUG(dev))
 841                 intel_connector->polled = DRM_CONNECTOR_POLL_CONNECT;
 842
 843         /*
 844          * Configure the automatic hotplug detection stuff
 845          */
 846         crt->force_hotplug_required = 0;
 847
 848         /*
 849          * TODO: find a proper way to discover whether we need to set the the
 850          * polarity and link reversal bits or not, instead of relying on the
 851          * BIOS.
 852          */
 853         if (HAS_PCH_LPT(dev)) {
 854                 u32 fdi_config = FDI_RX_POLARITY_REVERSED_LPT |
 855                                  FDI_RX_LINK_REVERSAL_OVERRIDE;
 856
 857                 dev_priv->fdi_rx_config = I915_READ(_FDI_RXA_CTL) & fdi_config;
 858         }
 859 }