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_crtc.h>
  32 #include <drm/drm_crtc_helper.h>
  33 #include <drm/drm_edid.h>
  34 #include "intel_drv.h"
  35 #include <drm/i915_drm.h>
  36 #include "i915_drv.h"
  37
  38 /* Here's the desired hotplug mode */
  39 #define ADPA_HOTPLUG_BITS (ADPA_CRT_HOTPLUG_PERIOD_128 |                \
  40                            ADPA_CRT_HOTPLUG_WARMUP_10MS |               \
  41                            ADPA_CRT_HOTPLUG_SAMPLE_4S |                 \
  42                            ADPA_CRT_HOTPLUG_VOLTAGE_50 |                \
  43                            ADPA_CRT_HOTPLUG_VOLREF_325MV |              \
  44                            ADPA_CRT_HOTPLUG_ENABLE)
  45
  46 struct intel_crt {
  47         struct intel_encoder base;
  48         /* DPMS state is stored in the connector, which we need in the
  49          * encoder's enable/disable callbacks */
  50         struct intel_connector *connector;
  51         bool force_hotplug_required;
  52         u32 adpa_reg;
  53 };
  54
  55 static struct intel_crt *intel_encoder_to_crt(struct intel_encoder *encoder)
  56 {
  57         return container_of(encoder, struct intel_crt, base);
  58 }
  59
  60 static struct intel_crt *intel_attached_crt(struct drm_connector *connector)
  61 {
  62         return intel_encoder_to_crt(intel_attached_encoder(connector));
  63 }
  64
  65 static bool intel_crt_get_hw_state(struct intel_encoder *encoder,
  66                                    enum pipe *pipe)
  67 {
  68         struct drm_device *dev = encoder->base.dev;
  69         struct drm_i915_private *dev_priv = dev->dev_private;
  70         struct intel_crt *crt = intel_encoder_to_crt(encoder);
  71         u32 tmp;
  72
  73         tmp = I915_READ(crt->adpa_reg);
  74
  75         if (!(tmp & ADPA_DAC_ENABLE))
  76                 return false;
  77
  78         if (HAS_PCH_CPT(dev))
  79                 *pipe = PORT_TO_PIPE_CPT(tmp);
  80         else
  81                 *pipe = PORT_TO_PIPE(tmp);
  82
  83         return true;
  84 }
  85
  86 static void intel_crt_get_config(struct intel_encoder *encoder,
  87                                  struct intel_crtc_config *pipe_config)
  88 {
  89         struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
  90         struct intel_crt *crt = intel_encoder_to_crt(encoder);
  91         u32 tmp, flags = 0;
  92
  93         tmp = I915_READ(crt->adpa_reg);
  94
  95         if (tmp & ADPA_HSYNC_ACTIVE_HIGH)
  96                 flags |= DRM_MODE_FLAG_PHSYNC;
  97         else
  98                 flags |= DRM_MODE_FLAG_NHSYNC;
  99
 100         if (tmp & ADPA_VSYNC_ACTIVE_HIGH)
 101                 flags |= DRM_MODE_FLAG_PVSYNC;
 102         else
 103                 flags |= DRM_MODE_FLAG_NVSYNC;
 104
 105         pipe_config->adjusted_mode.flags |= flags;
 106 }
 107
 108 /* Note: The caller is required to filter out dpms modes not supported by the
 109  * platform. */
 110 static void intel_crt_set_dpms(struct intel_encoder *encoder, int mode)
 111 {
 112         struct drm_device *dev = encoder->base.dev;
 113         struct drm_i915_private *dev_priv = dev->dev_private;
 114         struct intel_crt *crt = intel_encoder_to_crt(encoder);
 115         u32 temp;
 116
 117         temp = I915_READ(crt->adpa_reg);
 118         temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
 119         temp &= ~ADPA_DAC_ENABLE;
 120
 121         switch (mode) {
 122         case DRM_MODE_DPMS_ON:
 123                 temp |= ADPA_DAC_ENABLE;
 124                 break;
 125         case DRM_MODE_DPMS_STANDBY:
 126                 temp |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE;
 127                 break;
 128         case DRM_MODE_DPMS_SUSPEND:
 129                 temp |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE;
 130                 break;
 131         case DRM_MODE_DPMS_OFF:
 132                 temp |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE;
 133                 break;
 134         }
 135
 136         I915_WRITE(crt->adpa_reg, temp);
 137 }
 138
 139 static void intel_disable_crt(struct intel_encoder *encoder)
 140 {
 141         intel_crt_set_dpms(encoder, DRM_MODE_DPMS_OFF);
 142 }
 143
 144 static void intel_enable_crt(struct intel_encoder *encoder)
 145 {
 146         struct intel_crt *crt = intel_encoder_to_crt(encoder);
 147
 148         intel_crt_set_dpms(encoder, crt->connector->base.dpms);
 149 }
 150
 151 /* Special dpms function to support cloning between dvo/sdvo/crt. */
 152 static void intel_crt_dpms(struct drm_connector *connector, int mode)
 153 {
 154         struct drm_device *dev = connector->dev;
 155         struct intel_encoder *encoder = intel_attached_encoder(connector);
 156         struct drm_crtc *crtc;
 157         int old_dpms;
 158
 159         /* PCH platforms and VLV only support on/off. */
 160         if (INTEL_INFO(dev)->gen >= 5 && mode != DRM_MODE_DPMS_ON)
 161                 mode = DRM_MODE_DPMS_OFF;
 162
 163         if (mode == connector->dpms)
 164                 return;
 165
 166         old_dpms = connector->dpms;
 167         connector->dpms = mode;
 168
 169         /* Only need to change hw state when actually enabled */
 170         crtc = encoder->base.crtc;
 171         if (!crtc) {
 172                 encoder->connectors_active = false;
 173                 return;
 174         }
 175
 176         /* We need the pipe to run for anything but OFF. */
 177         if (mode == DRM_MODE_DPMS_OFF)
 178                 encoder->connectors_active = false;
 179         else
 180                 encoder->connectors_active = true;
 181
 182         /* We call connector dpms manually below in case pipe dpms doesn't
 183          * change due to cloning. */
 184         if (mode < old_dpms) {
 185                 /* From off to on, enable the pipe first. */
 186                 intel_crtc_update_dpms(crtc);
 187
 188                 intel_crt_set_dpms(encoder, mode);
 189         } else {
 190                 intel_crt_set_dpms(encoder, mode);
 191
 192                 intel_crtc_update_dpms(crtc);
 193         }
 194
 195         intel_modeset_check_state(connector->dev);
 196 }
 197
 198 static int intel_crt_mode_valid(struct drm_connector *connector,
 199                                 struct drm_display_mode *mode)
 200 {
 201         struct drm_device *dev = connector->dev;
 202
 203         int max_clock = 0;
 204         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 205                 return MODE_NO_DBLESCAN;
 206
 207         if (mode->clock < 25000)
 208                 return MODE_CLOCK_LOW;
 209
 210         if (IS_GEN2(dev))
 211                 max_clock = 350000;
 212         else
 213                 max_clock = 400000;
 214         if (mode->clock > max_clock)
 215                 return MODE_CLOCK_HIGH;
 216
 217         /* The FDI receiver on LPT only supports 8bpc and only has 2 lanes. */
 218         if (HAS_PCH_LPT(dev) &&
 219             (ironlake_get_lanes_required(mode->clock, 270000, 24) > 2))
 220                 return MODE_CLOCK_HIGH;
 221
 222         return MODE_OK;
 223 }
 224
 225 static bool intel_crt_compute_config(struct intel_encoder *encoder,
 226                                      struct intel_crtc_config *pipe_config)
 227 {
 228         struct drm_device *dev = encoder->base.dev;
 229
 230         if (HAS_PCH_SPLIT(dev))
 231                 pipe_config->has_pch_encoder = true;
 232
 233         /* LPT FDI RX only supports 8bpc. */
 234         if (HAS_PCH_LPT(dev))
 235                 pipe_config->pipe_bpp = 24;
 236
 237         return true;
 238 }
 239
 240 static void intel_crt_mode_set(struct intel_encoder *encoder)
 241 {
 242
 243         struct drm_device *dev = encoder->base.dev;
 244         struct intel_crt *crt = intel_encoder_to_crt(encoder);
 245         struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
 246         struct drm_i915_private *dev_priv = dev->dev_private;
 247         struct drm_display_mode *adjusted_mode = &crtc->config.adjusted_mode;
 248         u32 adpa;
 249
 250         if (HAS_PCH_SPLIT(dev))
 251                 adpa = ADPA_HOTPLUG_BITS;
 252         else
 253                 adpa = 0;
 254
 255         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 256                 adpa |= ADPA_HSYNC_ACTIVE_HIGH;
 257         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 258                 adpa |= ADPA_VSYNC_ACTIVE_HIGH;
 259
 260         /* For CPT allow 3 pipe config, for others just use A or B */
 261         if (HAS_PCH_LPT(dev))
 262                 ; /* Those bits don't exist here */
 263         else if (HAS_PCH_CPT(dev))
 264                 adpa |= PORT_TRANS_SEL_CPT(crtc->pipe);
 265         else if (crtc->pipe == 0)
 266                 adpa |= ADPA_PIPE_A_SELECT;
 267         else
 268                 adpa |= ADPA_PIPE_B_SELECT;
 269
 270         if (!HAS_PCH_SPLIT(dev))
 271                 I915_WRITE(BCLRPAT(crtc->pipe), 0);
 272
 273         I915_WRITE(crt->adpa_reg, adpa);
 274 }
 275
 276 static bool intel_ironlake_crt_detect_hotplug(struct drm_connector *connector)
 277 {
 278         struct drm_device *dev = connector->dev;
 279         struct intel_crt *crt = intel_attached_crt(connector);
 280         struct drm_i915_private *dev_priv = dev->dev_private;
 281         u32 adpa;
 282         bool ret;
 283
 284         /* The first time through, trigger an explicit detection cycle */
 285         if (crt->force_hotplug_required) {
 286                 bool turn_off_dac = HAS_PCH_SPLIT(dev);
 287                 u32 save_adpa;
 288
 289                 crt->force_hotplug_required = 0;
 290
 291                 save_adpa = adpa = I915_READ(crt->adpa_reg);
 292                 DRM_DEBUG_KMS("trigger hotplug detect cycle: adpa=0x%x\n", adpa);
 293
 294                 adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
 295                 if (turn_off_dac)
 296                         adpa &= ~ADPA_DAC_ENABLE;
 297
 298                 I915_WRITE(crt->adpa_reg, adpa);
 299
 300                 if (wait_for((I915_READ(crt->adpa_reg) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) == 0,
 301                              1000))
 302                         DRM_DEBUG_KMS("timed out waiting for FORCE_TRIGGER");
 303
 304                 if (turn_off_dac) {
 305                         I915_WRITE(crt->adpa_reg, save_adpa);
 306                         POSTING_READ(crt->adpa_reg);
 307                 }
 308         }
 309
 310         /* Check the status to see if both blue and green are on now */
 311         adpa = I915_READ(crt->adpa_reg);
 312         if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
 313                 ret = true;
 314         else
 315                 ret = false;
 316         DRM_DEBUG_KMS("ironlake hotplug adpa=0x%x, result %d\n", adpa, ret);
 317
 318         return ret;
 319 }
 320
 321 static bool valleyview_crt_detect_hotplug(struct drm_connector *connector)
 322 {
 323         struct drm_device *dev = connector->dev;
 324         struct intel_crt *crt = intel_attached_crt(connector);
 325         struct drm_i915_private *dev_priv = dev->dev_private;
 326         u32 adpa;
 327         bool ret;
 328         u32 save_adpa;
 329
 330         save_adpa = adpa = I915_READ(crt->adpa_reg);
 331         DRM_DEBUG_KMS("trigger hotplug detect cycle: adpa=0x%x\n", adpa);
 332
 333         adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
 334
 335         I915_WRITE(crt->adpa_reg, adpa);
 336
 337         if (wait_for((I915_READ(crt->adpa_reg) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) == 0,
 338                      1000)) {
 339                 DRM_DEBUG_KMS("timed out waiting for FORCE_TRIGGER");
 340                 I915_WRITE(crt->adpa_reg, save_adpa);
 341         }
 342
 343         /* Check the status to see if both blue and green are on now */
 344         adpa = I915_READ(crt->adpa_reg);
 345         if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
 346                 ret = true;
 347         else
 348                 ret = false;
 349
 350         DRM_DEBUG_KMS("valleyview hotplug adpa=0x%x, result %d\n", adpa, ret);
 351
 352         /* FIXME: debug force function and remove */
 353         ret = true;
 354
 355         return ret;
 356 }
 357
 358 /**
 359  * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect CRT presence.
 360  *
 361  * Not for i915G/i915GM
 362  *
 363  * \return true if CRT is connected.
 364  * \return false if CRT is disconnected.
 365  */
 366 static bool intel_crt_detect_hotplug(struct drm_connector *connector)
 367 {
 368         struct drm_device *dev = connector->dev;
 369         struct drm_i915_private *dev_priv = dev->dev_private;
 370         u32 hotplug_en, orig, stat;
 371         bool ret = false;
 372         int i, tries = 0;
 373
 374         if (HAS_PCH_SPLIT(dev))
 375                 return intel_ironlake_crt_detect_hotplug(connector);
 376
 377         if (IS_VALLEYVIEW(dev))
 378                 return valleyview_crt_detect_hotplug(connector);
 379
 380         /*
 381          * On 4 series desktop, CRT detect sequence need to be done twice
 382          * to get a reliable result.
 383          */
 384
 385         if (IS_G4X(dev) && !IS_GM45(dev))
 386                 tries = 2;
 387         else
 388                 tries = 1;
 389         hotplug_en = orig = I915_READ(PORT_HOTPLUG_EN);
 390         hotplug_en |= CRT_HOTPLUG_FORCE_DETECT;
 391
 392         for (i = 0; i < tries ; i++) {
 393                 /* turn on the FORCE_DETECT */
 394                 I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);
 395                 /* wait for FORCE_DETECT to go off */
 396                 if (wait_for((I915_READ(PORT_HOTPLUG_EN) &
 397                               CRT_HOTPLUG_FORCE_DETECT) == 0,
 398                              1000))
 399                         DRM_DEBUG_KMS("timed out waiting for FORCE_DETECT to go off");
 400         }
 401
 402         stat = I915_READ(PORT_HOTPLUG_STAT);
 403         if ((stat & CRT_HOTPLUG_MONITOR_MASK) != CRT_HOTPLUG_MONITOR_NONE)
 404                 ret = true;
 405
 406         /* clear the interrupt we just generated, if any */
 407         I915_WRITE(PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS);
 408
 409         /* and put the bits back */
 410         I915_WRITE(PORT_HOTPLUG_EN, orig);
 411
 412         return ret;
 413 }
 414
 415 static struct edid *intel_crt_get_edid(struct drm_connector *connector,
 416                                 struct i2c_adapter *i2c)
 417 {
 418         struct edid *edid;
 419
 420         edid = drm_get_edid(connector, i2c);
 421
 422         if (!edid && !intel_gmbus_is_forced_bit(i2c)) {
 423                 DRM_DEBUG_KMS("CRT GMBUS EDID read failed, retry using GPIO bit-banging\n");
 424                 intel_gmbus_force_bit(i2c, true);
 425                 edid = drm_get_edid(connector, i2c);
 426                 intel_gmbus_force_bit(i2c, false);
 427         }
 428
 429         return edid;
 430 }
 431
 432 /* local version of intel_ddc_get_modes() to use intel_crt_get_edid() */
 433 static int intel_crt_ddc_get_modes(struct drm_connector *connector,
 434                                 struct i2c_adapter *adapter)
 435 {
 436         struct edid *edid;
 437         int ret;
 438
 439         edid = intel_crt_get_edid(connector, adapter);
 440         if (!edid)
 441                 return 0;
 442
 443         ret = intel_connector_update_modes(connector, edid);
 444         kfree(edid);
 445
 446         return ret;
 447 }
 448
 449 static bool intel_crt_detect_ddc(struct drm_connector *connector)
 450 {
 451         struct intel_crt *crt = intel_attached_crt(connector);
 452         struct drm_i915_private *dev_priv = crt->base.base.dev->dev_private;
 453         struct edid *edid;
 454         struct i2c_adapter *i2c;
 455
 456         BUG_ON(crt->base.type != INTEL_OUTPUT_ANALOG);
 457
 458         i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->vbt.crt_ddc_pin);
 459         edid = intel_crt_get_edid(connector, i2c);
 460
 461         if (edid) {
 462                 bool is_digital = edid->input & DRM_EDID_INPUT_DIGITAL;
 463
 464                 /*
 465                  * This may be a DVI-I connector with a shared DDC
 466                  * link between analog and digital outputs, so we
 467                  * have to check the EDID input spec of the attached device.
 468                  */
 469                 if (!is_digital) {
 470                         DRM_DEBUG_KMS("CRT detected via DDC:0x50 [EDID]\n");
 471                         return true;
 472                 }
 473
 474                 DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [EDID reports a digital panel]\n");
 475         } else {
 476                 DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [no valid EDID found]\n");
 477         }
 478
 479         kfree(edid);
 480
 481         return false;
 482 }
 483
 484 static enum drm_connector_status
 485 intel_crt_load_detect(struct intel_crt *crt)
 486 {
 487         struct drm_device *dev = crt->base.base.dev;
 488         struct drm_i915_private *dev_priv = dev->dev_private;
 489         uint32_t pipe = to_intel_crtc(crt->base.base.crtc)->pipe;
 490         uint32_t save_bclrpat;
 491         uint32_t save_vtotal;
 492         uint32_t vtotal, vactive;
 493         uint32_t vsample;
 494         uint32_t vblank, vblank_start, vblank_end;
 495         uint32_t dsl;
 496         uint32_t bclrpat_reg;
 497         uint32_t vtotal_reg;
 498         uint32_t vblank_reg;
 499         uint32_t vsync_reg;
 500         uint32_t pipeconf_reg;
 501         uint32_t pipe_dsl_reg;
 502         uint8_t st00;
 503         enum drm_connector_status status;
 504
 505         DRM_DEBUG_KMS("starting load-detect on CRT\n");
 506
 507         bclrpat_reg = BCLRPAT(pipe);
 508         vtotal_reg = VTOTAL(pipe);
 509         vblank_reg = VBLANK(pipe);
 510         vsync_reg = VSYNC(pipe);
 511         pipeconf_reg = PIPECONF(pipe);
 512         pipe_dsl_reg = PIPEDSL(pipe);
 513
 514         save_bclrpat = I915_READ(bclrpat_reg);
 515         save_vtotal = I915_READ(vtotal_reg);
 516         vblank = I915_READ(vblank_reg);
 517
 518         vtotal = ((save_vtotal >> 16) & 0xfff) + 1;
 519         vactive = (save_vtotal & 0x7ff) + 1;
 520
 521         vblank_start = (vblank & 0xfff) + 1;
 522         vblank_end = ((vblank >> 16) & 0xfff) + 1;
 523
 524         /* Set the border color to purple. */
 525         I915_WRITE(bclrpat_reg, 0x500050);
 526
 527         if (!IS_GEN2(dev)) {
 528                 uint32_t pipeconf = I915_READ(pipeconf_reg);
 529                 I915_WRITE(pipeconf_reg, pipeconf | PIPECONF_FORCE_BORDER);
 530                 POSTING_READ(pipeconf_reg);
 531                 /* Wait for next Vblank to substitue
 532                  * border color for Color info */
 533                 intel_wait_for_vblank(dev, pipe);
 534                 st00 = I915_READ8(VGA_MSR_WRITE);
 535                 status = ((st00 & (1 << 4)) != 0) ?
 536                         connector_status_connected :
 537                         connector_status_disconnected;
 538
 539                 I915_WRITE(pipeconf_reg, pipeconf);
 540         } else {
 541                 bool restore_vblank = false;
 542                 int count, detect;
 543
 544                 /*
 545                 * If there isn't any border, add some.
 546                 * Yes, this will flicker
 547                 */
 548                 if (vblank_start <= vactive && vblank_end >= vtotal) {
 549                         uint32_t vsync = I915_READ(vsync_reg);
 550                         uint32_t vsync_start = (vsync & 0xffff) + 1;
 551
 552                         vblank_start = vsync_start;
 553                         I915_WRITE(vblank_reg,
 554                                    (vblank_start - 1) |
 555                                    ((vblank_end - 1) << 16));
 556                         restore_vblank = true;
 557                 }
 558                 /* sample in the vertical border, selecting the larger one */
 559                 if (vblank_start - vactive >= vtotal - vblank_end)
 560                         vsample = (vblank_start + vactive) >> 1;
 561                 else
 562                         vsample = (vtotal + vblank_end) >> 1;
 563
 564                 /*
 565                  * Wait for the border to be displayed
 566                  */
 567                 while (I915_READ(pipe_dsl_reg) >= vactive)
 568                         ;
 569                 while ((dsl = I915_READ(pipe_dsl_reg)) <= vsample)
 570                         ;
 571                 /*
 572                  * Watch ST00 for an entire scanline
 573                  */
 574                 detect = 0;
 575                 count = 0;
 576                 do {
 577                         count++;
 578                         /* Read the ST00 VGA status register */
 579                         st00 = I915_READ8(VGA_MSR_WRITE);
 580                         if (st00 & (1 << 4))
 581                                 detect++;
 582                 } while ((I915_READ(pipe_dsl_reg) == dsl));
 583
 584                 /* restore vblank if necessary */
 585                 if (restore_vblank)
 586                         I915_WRITE(vblank_reg, vblank);
 587                 /*
 588                  * If more than 3/4 of the scanline detected a monitor,
 589                  * then it is assumed to be present. This works even on i830,
 590                  * where there isn't any way to force the border color across
 591                  * the screen
 592                  */
 593                 status = detect * 4 > count * 3 ?
 594                          connector_status_connected :
 595                          connector_status_disconnected;
 596         }
 597
 598         /* Restore previous settings */
 599         I915_WRITE(bclrpat_reg, save_bclrpat);
 600
 601         return status;
 602 }
 603
 604 static enum drm_connector_status
 605 intel_crt_detect(struct drm_connector *connector, bool force)
 606 {
 607         struct drm_device *dev = connector->dev;
 608         struct intel_crt *crt = intel_attached_crt(connector);
 609         enum drm_connector_status status;
 610         struct intel_load_detect_pipe tmp;
 611
 612         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force=%d\n",
 613                       connector->base.id, drm_get_connector_name(connector),
 614                       force);
 615
 616         if (I915_HAS_HOTPLUG(dev)) {
 617                 /* We can not rely on the HPD pin always being correctly wired
 618                  * up, for example many KVM do not pass it through, and so
 619                  * only trust an assertion that the monitor is connected.
 620                  */
 621                 if (intel_crt_detect_hotplug(connector)) {
 622                         DRM_DEBUG_KMS("CRT detected via hotplug\n");
 623                         return connector_status_connected;
 624                 } else
 625                         DRM_DEBUG_KMS("CRT not detected via hotplug\n");
 626         }
 627
 628         if (intel_crt_detect_ddc(connector))
 629                 return connector_status_connected;
 630
 631         /* Load detection is broken on HPD capable machines. Whoever wants a
 632          * broken monitor (without edid) to work behind a broken kvm (that fails
 633          * to have the right resistors for HP detection) needs to fix this up.
 634          * For now just bail out. */
 635         if (I915_HAS_HOTPLUG(dev))
 636                 return connector_status_disconnected;
 637
 638         if (!force)
 639                 return connector->status;
 640
 641         /* for pre-945g platforms use load detect */
 642         if (intel_get_load_detect_pipe(connector, NULL, &tmp)) {
 643                 if (intel_crt_detect_ddc(connector))
 644                         status = connector_status_connected;
 645                 else
 646                         status = intel_crt_load_detect(crt);
 647                 intel_release_load_detect_pipe(connector, &tmp);
 648         } else
 649                 status = connector_status_unknown;
 650
 651         return status;
 652 }
 653
 654 static void intel_crt_destroy(struct drm_connector *connector)
 655 {
 656         drm_sysfs_connector_remove(connector);
 657         drm_connector_cleanup(connector);
 658         kfree(connector);
 659 }
 660
 661 static int intel_crt_get_modes(struct drm_connector *connector)
 662 {
 663         struct drm_device *dev = connector->dev;
 664         struct drm_i915_private *dev_priv = dev->dev_private;
 665         int ret;
 666         struct i2c_adapter *i2c;
 667
 668         i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->vbt.crt_ddc_pin);
 669         ret = intel_crt_ddc_get_modes(connector, i2c);
 670         if (ret || !IS_G4X(dev))
 671                 return ret;
 672
 673         /* Try to probe digital port for output in DVI-I -> VGA mode. */
 674         i2c = intel_gmbus_get_adapter(dev_priv, GMBUS_PORT_DPB);
 675         return intel_crt_ddc_get_modes(connector, i2c);
 676 }
 677
 678 static int intel_crt_set_property(struct drm_connector *connector,
 679                                   struct drm_property *property,
 680                                   uint64_t value)
 681 {
 682         return 0;
 683 }
 684
 685 static void intel_crt_reset(struct drm_connector *connector)
 686 {
 687         struct drm_device *dev = connector->dev;
 688         struct drm_i915_private *dev_priv = dev->dev_private;
 689         struct intel_crt *crt = intel_attached_crt(connector);
 690
 691         if (INTEL_INFO(dev)->gen >= 5) {
 692                 u32 adpa;
 693
 694                 adpa = I915_READ(crt->adpa_reg);
 695                 adpa &= ~ADPA_CRT_HOTPLUG_MASK;
 696                 adpa |= ADPA_HOTPLUG_BITS;
 697                 I915_WRITE(crt->adpa_reg, adpa);
 698                 POSTING_READ(crt->adpa_reg);
 699
 700                 DRM_DEBUG_KMS("pch crt adpa set to 0x%x\n", adpa);
 701                 crt->force_hotplug_required = 1;
 702         }
 703
 704 }
 705
 706 /*
 707  * Routines for controlling stuff on the analog port
 708  */
 709
 710 static const struct drm_connector_funcs intel_crt_connector_funcs = {
 711         .reset = intel_crt_reset,
 712         .dpms = intel_crt_dpms,
 713         .detect = intel_crt_detect,
 714         .fill_modes = drm_helper_probe_single_connector_modes,
 715         .destroy = intel_crt_destroy,
 716         .set_property = intel_crt_set_property,
 717 };
 718
 719 static const struct drm_connector_helper_funcs intel_crt_connector_helper_funcs = {
 720         .mode_valid = intel_crt_mode_valid,
 721         .get_modes = intel_crt_get_modes,
 722         .best_encoder = intel_best_encoder,
 723 };
 724
 725 static const struct drm_encoder_funcs intel_crt_enc_funcs = {
 726         .destroy = intel_encoder_destroy,
 727 };
 728
 729 static int __init intel_no_crt_dmi_callback(const struct dmi_system_id *id)
 730 {
 731         DRM_INFO("Skipping CRT initialization for %s\n", id->ident);
 732         return 1;
 733 }
 734
 735 static const struct dmi_system_id intel_no_crt[] = {
 736         {
 737                 .callback = intel_no_crt_dmi_callback,
 738                 .ident = "ACER ZGB",
 739                 .matches = {
 740                         DMI_MATCH(DMI_SYS_VENDOR, "ACER"),
 741                         DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
 742                 },
 743         },
 744         { }
 745 };
 746
 747 void intel_crt_init(struct drm_device *dev)
 748 {
 749         struct drm_connector *connector;
 750         struct intel_crt *crt;
 751         struct intel_connector *intel_connector;
 752         struct drm_i915_private *dev_priv = dev->dev_private;
 753
 754         /* Skip machines without VGA that falsely report hotplug events */
 755         if (dmi_check_system(intel_no_crt))
 756                 return;
 757
 758         crt = kzalloc(sizeof(struct intel_crt), GFP_KERNEL);
 759         if (!crt)
 760                 return;
 761
 762         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
 763         if (!intel_connector) {
 764                 kfree(crt);
 765                 return;
 766         }
 767
 768         connector = &intel_connector->base;
 769         crt->connector = intel_connector;
 770         drm_connector_init(dev, &intel_connector->base,
 771                            &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);
 772
 773         drm_encoder_init(dev, &crt->base.base, &intel_crt_enc_funcs,
 774                          DRM_MODE_ENCODER_DAC);
 775
 776         intel_connector_attach_encoder(intel_connector, &crt->base);
 777
 778         crt->base.type = INTEL_OUTPUT_ANALOG;
 779         crt->base.cloneable = true;
 780         if (IS_I830(dev))
 781                 crt->base.crtc_mask = (1 << 0);
 782         else
 783                 crt->base.crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
 784
 785         if (IS_GEN2(dev))
 786                 connector->interlace_allowed = 0;
 787         else
 788                 connector->interlace_allowed = 1;
 789         connector->doublescan_allowed = 0;
 790
 791         if (HAS_PCH_SPLIT(dev))
 792                 crt->adpa_reg = PCH_ADPA;
 793         else if (IS_VALLEYVIEW(dev))
 794                 crt->adpa_reg = VLV_ADPA;
 795         else
 796                 crt->adpa_reg = ADPA;
 797
 798         crt->base.compute_config = intel_crt_compute_config;
 799         crt->base.mode_set = intel_crt_mode_set;
 800         crt->base.disable = intel_disable_crt;
 801         crt->base.enable = intel_enable_crt;
 802         crt->base.get_config = intel_crt_get_config;
 803         if (I915_HAS_HOTPLUG(dev))
 804                 crt->base.hpd_pin = HPD_CRT;
 805         if (HAS_DDI(dev))
 806                 crt->base.get_hw_state = intel_ddi_get_hw_state;
 807         else
 808                 crt->base.get_hw_state = intel_crt_get_hw_state;
 809         intel_connector->get_hw_state = intel_connector_get_hw_state;
 810
 811         drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs);
 812
 813         drm_sysfs_connector_add(connector);
 814
 815         if (!I915_HAS_HOTPLUG(dev))
 816                 intel_connector->polled = DRM_CONNECTOR_POLL_CONNECT;
 817
 818         /*
 819          * Configure the automatic hotplug detection stuff
 820          */
 821         crt->force_hotplug_required = 0;
 822
 823         /*
 824          * TODO: find a proper way to discover whether we need to set the the
 825          * polarity and link reversal bits or not, instead of relying on the
 826          * BIOS.
 827          */
 828         if (HAS_PCH_LPT(dev)) {
 829                 u32 fdi_config = FDI_RX_POLARITY_REVERSED_LPT |
 830                                  FDI_RX_LINK_REVERSAL_OVERRIDE;
 831
 832                 dev_priv->fdi_rx_config = I915_READ(_FDI_RXA_CTL) & fdi_config;
 833         }
 834 }