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/i2c.h>
  28 #include <linux/slab.h>
  29 #include "drmP.h"
  30 #include "drm.h"
  31 #include "drm_crtc.h"
  32 #include "drm_crtc_helper.h"
  33 #include "intel_drv.h"
  34 #include "i915_drm.h"
  35 #include "i915_drv.h"
  36
  37 static void intel_crt_dpms(struct drm_encoder *encoder, int mode)
  38 {
  39         struct drm_device *dev = encoder->dev;
  40         struct drm_i915_private *dev_priv = dev->dev_private;
  41         u32 temp, reg;
  42
  43         if (HAS_PCH_SPLIT(dev))
  44                 reg = PCH_ADPA;
  45         else
  46                 reg = ADPA;
  47
  48         temp = I915_READ(reg);
  49         temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
  50         temp &= ~ADPA_DAC_ENABLE;
  51
  52         switch(mode) {
  53         case DRM_MODE_DPMS_ON:
  54                 temp |= ADPA_DAC_ENABLE;
  55                 break;
  56         case DRM_MODE_DPMS_STANDBY:
  57                 temp |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE;
  58                 break;
  59         case DRM_MODE_DPMS_SUSPEND:
  60                 temp |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE;
  61                 break;
  62         case DRM_MODE_DPMS_OFF:
  63                 temp |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE;
  64                 break;
  65         }
  66
  67         I915_WRITE(reg, temp);
  68 }
  69
  70 static int intel_crt_mode_valid(struct drm_connector *connector,
  71                                 struct drm_display_mode *mode)
  72 {
  73         struct drm_device *dev = connector->dev;
  74
  75         int max_clock = 0;
  76         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
  77                 return MODE_NO_DBLESCAN;
  78
  79         if (mode->clock < 25000)
  80                 return MODE_CLOCK_LOW;
  81
  82         if (!IS_I9XX(dev))
  83                 max_clock = 350000;
  84         else
  85                 max_clock = 400000;
  86         if (mode->clock > max_clock)
  87                 return MODE_CLOCK_HIGH;
  88
  89         return MODE_OK;
  90 }
  91
  92 static bool intel_crt_mode_fixup(struct drm_encoder *encoder,
  93                                  struct drm_display_mode *mode,
  94                                  struct drm_display_mode *adjusted_mode)
  95 {
  96         return true;
  97 }
  98
  99 static void intel_crt_mode_set(struct drm_encoder *encoder,
 100                                struct drm_display_mode *mode,
 101                                struct drm_display_mode *adjusted_mode)
 102 {
 103
 104         struct drm_device *dev = encoder->dev;
 105         struct drm_crtc *crtc = encoder->crtc;
 106         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 107         struct drm_i915_private *dev_priv = dev->dev_private;
 108         int dpll_md_reg;
 109         u32 adpa, dpll_md;
 110         u32 adpa_reg;
 111
 112         if (intel_crtc->pipe == 0)
 113                 dpll_md_reg = DPLL_A_MD;
 114         else
 115                 dpll_md_reg = DPLL_B_MD;
 116
 117         if (HAS_PCH_SPLIT(dev))
 118                 adpa_reg = PCH_ADPA;
 119         else
 120                 adpa_reg = ADPA;
 121
 122         /*
 123          * Disable separate mode multiplier used when cloning SDVO to CRT
 124          * XXX this needs to be adjusted when we really are cloning
 125          */
 126         if (IS_I965G(dev) && !HAS_PCH_SPLIT(dev)) {
 127                 dpll_md = I915_READ(dpll_md_reg);
 128                 I915_WRITE(dpll_md_reg,
 129                            dpll_md & ~DPLL_MD_UDI_MULTIPLIER_MASK);
 130         }
 131
 132         adpa = 0;
 133         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 134                 adpa |= ADPA_HSYNC_ACTIVE_HIGH;
 135         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 136                 adpa |= ADPA_VSYNC_ACTIVE_HIGH;
 137
 138         if (intel_crtc->pipe == 0) {
 139                 if (HAS_PCH_CPT(dev))
 140                         adpa |= PORT_TRANS_A_SEL_CPT;
 141                 else
 142                         adpa |= ADPA_PIPE_A_SELECT;
 143                 if (!HAS_PCH_SPLIT(dev))
 144                         I915_WRITE(BCLRPAT_A, 0);
 145         } else {
 146                 if (HAS_PCH_CPT(dev))
 147                         adpa |= PORT_TRANS_B_SEL_CPT;
 148                 else
 149                         adpa |= ADPA_PIPE_B_SELECT;
 150                 if (!HAS_PCH_SPLIT(dev))
 151                         I915_WRITE(BCLRPAT_B, 0);
 152         }
 153
 154         I915_WRITE(adpa_reg, adpa);
 155 }
 156
 157 static bool intel_ironlake_crt_detect_hotplug(struct drm_connector *connector)
 158 {
 159         struct drm_device *dev = connector->dev;
 160         struct drm_i915_private *dev_priv = dev->dev_private;
 161         u32 adpa, temp;
 162         bool ret;
 163
 164         temp = adpa = I915_READ(PCH_ADPA);
 165
 166         if (HAS_PCH_CPT(dev)) {
 167                 /* Disable DAC before force detect */
 168                 I915_WRITE(PCH_ADPA, adpa & ~ADPA_DAC_ENABLE);
 169                 (void)I915_READ(PCH_ADPA);
 170         } else {
 171                 adpa &= ~ADPA_CRT_HOTPLUG_MASK;
 172                 /* disable HPD first */
 173                 I915_WRITE(PCH_ADPA, adpa);
 174                 (void)I915_READ(PCH_ADPA);
 175         }
 176
 177         adpa |= (ADPA_CRT_HOTPLUG_PERIOD_128 |
 178                         ADPA_CRT_HOTPLUG_WARMUP_10MS |
 179                         ADPA_CRT_HOTPLUG_SAMPLE_4S |
 180                         ADPA_CRT_HOTPLUG_VOLTAGE_50 | /* default */
 181                         ADPA_CRT_HOTPLUG_VOLREF_325MV |
 182                         ADPA_CRT_HOTPLUG_ENABLE |
 183                         ADPA_CRT_HOTPLUG_FORCE_TRIGGER);
 184
 185         DRM_DEBUG_KMS("pch crt adpa 0x%x", adpa);
 186         I915_WRITE(PCH_ADPA, adpa);
 187
 188         if (wait_for((I915_READ(PCH_ADPA) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) == 0,
 189                      1000, 1))
 190                 DRM_ERROR("timed out waiting for FORCE_TRIGGER");
 191
 192         if (HAS_PCH_CPT(dev)) {
 193                 I915_WRITE(PCH_ADPA, temp);
 194                 (void)I915_READ(PCH_ADPA);
 195         }
 196
 197         /* Check the status to see if both blue and green are on now */
 198         adpa = I915_READ(PCH_ADPA);
 199         adpa &= ADPA_CRT_HOTPLUG_MONITOR_MASK;
 200         if ((adpa == ADPA_CRT_HOTPLUG_MONITOR_COLOR) ||
 201                 (adpa == ADPA_CRT_HOTPLUG_MONITOR_MONO))
 202                 ret = true;
 203         else
 204                 ret = false;
 205
 206         return ret;
 207 }
 208
 209 /**
 210  * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect CRT presence.
 211  *
 212  * Not for i915G/i915GM
 213  *
 214  * \return true if CRT is connected.
 215  * \return false if CRT is disconnected.
 216  */
 217 static bool intel_crt_detect_hotplug(struct drm_connector *connector)
 218 {
 219         struct drm_device *dev = connector->dev;
 220         struct drm_i915_private *dev_priv = dev->dev_private;
 221         u32 hotplug_en, orig, stat;
 222         bool ret = false;
 223         int i, tries = 0;
 224
 225         if (HAS_PCH_SPLIT(dev))
 226                 return intel_ironlake_crt_detect_hotplug(connector);
 227
 228         /*
 229          * On 4 series desktop, CRT detect sequence need to be done twice
 230          * to get a reliable result.
 231          */
 232
 233         if (IS_G4X(dev) && !IS_GM45(dev))
 234                 tries = 2;
 235         else
 236                 tries = 1;
 237         hotplug_en = orig = I915_READ(PORT_HOTPLUG_EN);
 238         hotplug_en |= CRT_HOTPLUG_FORCE_DETECT;
 239
 240         for (i = 0; i < tries ; i++) {
 241                 /* turn on the FORCE_DETECT */
 242                 I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);
 243                 /* wait for FORCE_DETECT to go off */
 244                 if (wait_for((I915_READ(PORT_HOTPLUG_EN) &
 245                               CRT_HOTPLUG_FORCE_DETECT) == 0,
 246                              1000, 1))
 247                         DRM_ERROR("timed out waiting for FORCE_DETECT to go off");
 248         }
 249
 250         stat = I915_READ(PORT_HOTPLUG_STAT);
 251         if ((stat & CRT_HOTPLUG_MONITOR_MASK) != CRT_HOTPLUG_MONITOR_NONE)
 252                 ret = true;
 253
 254         /* clear the interrupt we just generated, if any */
 255         I915_WRITE(PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS);
 256
 257         /* and put the bits back */
 258         I915_WRITE(PORT_HOTPLUG_EN, orig);
 259
 260         return ret;
 261 }
 262
 263 static bool intel_crt_detect_ddc(struct drm_encoder *encoder)
 264 {
 265         struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
 266
 267         /* CRT should always be at 0, but check anyway */
 268         if (intel_encoder->type != INTEL_OUTPUT_ANALOG)
 269                 return false;
 270
 271         return intel_ddc_probe(intel_encoder);
 272 }
 273
 274 static enum drm_connector_status
 275 intel_crt_load_detect(struct drm_crtc *crtc, struct intel_encoder *intel_encoder)
 276 {
 277         struct drm_encoder *encoder = &intel_encoder->enc;
 278         struct drm_device *dev = encoder->dev;
 279         struct drm_i915_private *dev_priv = dev->dev_private;
 280         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 281         uint32_t pipe = intel_crtc->pipe;
 282         uint32_t save_bclrpat;
 283         uint32_t save_vtotal;
 284         uint32_t vtotal, vactive;
 285         uint32_t vsample;
 286         uint32_t vblank, vblank_start, vblank_end;
 287         uint32_t dsl;
 288         uint32_t bclrpat_reg;
 289         uint32_t vtotal_reg;
 290         uint32_t vblank_reg;
 291         uint32_t vsync_reg;
 292         uint32_t pipeconf_reg;
 293         uint32_t pipe_dsl_reg;
 294         uint8_t st00;
 295         enum drm_connector_status status;
 296
 297         if (pipe == 0) {
 298                 bclrpat_reg = BCLRPAT_A;
 299                 vtotal_reg = VTOTAL_A;
 300                 vblank_reg = VBLANK_A;
 301                 vsync_reg = VSYNC_A;
 302                 pipeconf_reg = PIPEACONF;
 303                 pipe_dsl_reg = PIPEADSL;
 304         } else {
 305                 bclrpat_reg = BCLRPAT_B;
 306                 vtotal_reg = VTOTAL_B;
 307                 vblank_reg = VBLANK_B;
 308                 vsync_reg = VSYNC_B;
 309                 pipeconf_reg = PIPEBCONF;
 310                 pipe_dsl_reg = PIPEBDSL;
 311         }
 312
 313         save_bclrpat = I915_READ(bclrpat_reg);
 314         save_vtotal = I915_READ(vtotal_reg);
 315         vblank = I915_READ(vblank_reg);
 316
 317         vtotal = ((save_vtotal >> 16) & 0xfff) + 1;
 318         vactive = (save_vtotal & 0x7ff) + 1;
 319
 320         vblank_start = (vblank & 0xfff) + 1;
 321         vblank_end = ((vblank >> 16) & 0xfff) + 1;
 322
 323         /* Set the border color to purple. */
 324         I915_WRITE(bclrpat_reg, 0x500050);
 325
 326         if (IS_I9XX(dev)) {
 327                 uint32_t pipeconf = I915_READ(pipeconf_reg);
 328                 I915_WRITE(pipeconf_reg, pipeconf | PIPECONF_FORCE_BORDER);
 329                 /* Wait for next Vblank to substitue
 330                  * border color for Color info */
 331                 intel_wait_for_vblank(dev);
 332                 st00 = I915_READ8(VGA_MSR_WRITE);
 333                 status = ((st00 & (1 << 4)) != 0) ?
 334                         connector_status_connected :
 335                         connector_status_disconnected;
 336
 337                 I915_WRITE(pipeconf_reg, pipeconf);
 338         } else {
 339                 bool restore_vblank = false;
 340                 int count, detect;
 341
 342                 /*
 343                 * If there isn't any border, add some.
 344                 * Yes, this will flicker
 345                 */
 346                 if (vblank_start <= vactive && vblank_end >= vtotal) {
 347                         uint32_t vsync = I915_READ(vsync_reg);
 348                         uint32_t vsync_start = (vsync & 0xffff) + 1;
 349
 350                         vblank_start = vsync_start;
 351                         I915_WRITE(vblank_reg,
 352                                    (vblank_start - 1) |
 353                                    ((vblank_end - 1) << 16));
 354                         restore_vblank = true;
 355                 }
 356                 /* sample in the vertical border, selecting the larger one */
 357                 if (vblank_start - vactive >= vtotal - vblank_end)
 358                         vsample = (vblank_start + vactive) >> 1;
 359                 else
 360                         vsample = (vtotal + vblank_end) >> 1;
 361
 362                 /*
 363                  * Wait for the border to be displayed
 364                  */
 365                 while (I915_READ(pipe_dsl_reg) >= vactive)
 366                         ;
 367                 while ((dsl = I915_READ(pipe_dsl_reg)) <= vsample)
 368                         ;
 369                 /*
 370                  * Watch ST00 for an entire scanline
 371                  */
 372                 detect = 0;
 373                 count = 0;
 374                 do {
 375                         count++;
 376                         /* Read the ST00 VGA status register */
 377                         st00 = I915_READ8(VGA_MSR_WRITE);
 378                         if (st00 & (1 << 4))
 379                                 detect++;
 380                 } while ((I915_READ(pipe_dsl_reg) == dsl));
 381
 382                 /* restore vblank if necessary */
 383                 if (restore_vblank)
 384                         I915_WRITE(vblank_reg, vblank);
 385                 /*
 386                  * If more than 3/4 of the scanline detected a monitor,
 387                  * then it is assumed to be present. This works even on i830,
 388                  * where there isn't any way to force the border color across
 389                  * the screen
 390                  */
 391                 status = detect * 4 > count * 3 ?
 392                          connector_status_connected :
 393                          connector_status_disconnected;
 394         }
 395
 396         /* Restore previous settings */
 397         I915_WRITE(bclrpat_reg, save_bclrpat);
 398
 399         return status;
 400 }
 401
 402 static enum drm_connector_status intel_crt_detect(struct drm_connector *connector)
 403 {
 404         struct drm_device *dev = connector->dev;
 405         struct drm_encoder *encoder = intel_attached_encoder(connector);
 406         struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
 407         struct drm_crtc *crtc;
 408         int dpms_mode;
 409         enum drm_connector_status status;
 410
 411         if (IS_I9XX(dev) && !IS_I915G(dev) && !IS_I915GM(dev)) {
 412                 if (intel_crt_detect_hotplug(connector))
 413                         return connector_status_connected;
 414                 else
 415                         return connector_status_disconnected;
 416         }
 417
 418         if (intel_crt_detect_ddc(encoder))
 419                 return connector_status_connected;
 420
 421         /* for pre-945g platforms use load detect */
 422         if (encoder->crtc && encoder->crtc->enabled) {
 423                 status = intel_crt_load_detect(encoder->crtc, intel_encoder);
 424         } else {
 425                 crtc = intel_get_load_detect_pipe(intel_encoder, connector,
 426                                                   NULL, &dpms_mode);
 427                 if (crtc) {
 428                         status = intel_crt_load_detect(crtc, intel_encoder);
 429                         intel_release_load_detect_pipe(intel_encoder,
 430                                                        connector, dpms_mode);
 431                 } else
 432                         status = connector_status_unknown;
 433         }
 434
 435         return status;
 436 }
 437
 438 static void intel_crt_destroy(struct drm_connector *connector)
 439 {
 440         drm_sysfs_connector_remove(connector);
 441         drm_connector_cleanup(connector);
 442         kfree(connector);
 443 }
 444
 445 static int intel_crt_get_modes(struct drm_connector *connector)
 446 {
 447         int ret;
 448         struct drm_encoder *encoder = intel_attached_encoder(connector);
 449         struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
 450         struct i2c_adapter *ddc_bus;
 451         struct drm_device *dev = connector->dev;
 452
 453
 454         ret = intel_ddc_get_modes(connector, intel_encoder->ddc_bus);
 455         if (ret || !IS_G4X(dev))
 456                 goto end;
 457
 458         /* Try to probe digital port for output in DVI-I -> VGA mode. */
 459         ddc_bus = intel_i2c_create(connector->dev, GPIOD, "CRTDDC_D");
 460
 461         if (!ddc_bus) {
 462                 dev_printk(KERN_ERR, &connector->dev->pdev->dev,
 463                            "DDC bus registration failed for CRTDDC_D.\n");
 464                 goto end;
 465         }
 466         /* Try to get modes by GPIOD port */
 467         ret = intel_ddc_get_modes(connector, ddc_bus);
 468         intel_i2c_destroy(ddc_bus);
 469
 470 end:
 471         return ret;
 472
 473 }
 474
 475 static int intel_crt_set_property(struct drm_connector *connector,
 476                                   struct drm_property *property,
 477                                   uint64_t value)
 478 {
 479         return 0;
 480 }
 481
 482 /*
 483  * Routines for controlling stuff on the analog port
 484  */
 485
 486 static const struct drm_encoder_helper_funcs intel_crt_helper_funcs = {
 487         .dpms = intel_crt_dpms,
 488         .mode_fixup = intel_crt_mode_fixup,
 489         .prepare = intel_encoder_prepare,
 490         .commit = intel_encoder_commit,
 491         .mode_set = intel_crt_mode_set,
 492 };
 493
 494 static const struct drm_connector_funcs intel_crt_connector_funcs = {
 495         .dpms = drm_helper_connector_dpms,
 496         .detect = intel_crt_detect,
 497         .fill_modes = drm_helper_probe_single_connector_modes,
 498         .destroy = intel_crt_destroy,
 499         .set_property = intel_crt_set_property,
 500 };
 501
 502 static const struct drm_connector_helper_funcs intel_crt_connector_helper_funcs = {
 503         .mode_valid = intel_crt_mode_valid,
 504         .get_modes = intel_crt_get_modes,
 505         .best_encoder = intel_attached_encoder,
 506 };
 507
 508 static const struct drm_encoder_funcs intel_crt_enc_funcs = {
 509         .destroy = intel_encoder_destroy,
 510 };
 511
 512 void intel_crt_init(struct drm_device *dev)
 513 {
 514         struct drm_connector *connector;
 515         struct intel_encoder *intel_encoder;
 516         struct intel_connector *intel_connector;
 517         struct drm_i915_private *dev_priv = dev->dev_private;
 518         u32 i2c_reg;
 519
 520         intel_encoder = kzalloc(sizeof(struct intel_encoder), GFP_KERNEL);
 521         if (!intel_encoder)
 522                 return;
 523
 524         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
 525         if (!intel_connector) {
 526                 kfree(intel_encoder);
 527                 return;
 528         }
 529
 530         connector = &intel_connector->base;
 531         drm_connector_init(dev, &intel_connector->base,
 532                            &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);
 533
 534         drm_encoder_init(dev, &intel_encoder->enc, &intel_crt_enc_funcs,
 535                          DRM_MODE_ENCODER_DAC);
 536
 537         drm_mode_connector_attach_encoder(&intel_connector->base,
 538                                           &intel_encoder->enc);
 539
 540         /* Set up the DDC bus. */
 541         if (HAS_PCH_SPLIT(dev))
 542                 i2c_reg = PCH_GPIOA;
 543         else {
 544                 i2c_reg = GPIOA;
 545                 /* Use VBT information for CRT DDC if available */
 546                 if (dev_priv->crt_ddc_bus != 0)
 547                         i2c_reg = dev_priv->crt_ddc_bus;
 548         }
 549         intel_encoder->ddc_bus = intel_i2c_create(dev, i2c_reg, "CRTDDC_A");
 550         if (!intel_encoder->ddc_bus) {
 551                 dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
 552                            "failed.\n");
 553                 return;
 554         }
 555
 556         intel_encoder->type = INTEL_OUTPUT_ANALOG;
 557         intel_encoder->clone_mask = (1 << INTEL_SDVO_NON_TV_CLONE_BIT) |
 558                                    (1 << INTEL_ANALOG_CLONE_BIT) |
 559                                    (1 << INTEL_SDVO_LVDS_CLONE_BIT);
 560         intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 561         connector->interlace_allowed = 1;
 562         connector->doublescan_allowed = 0;
 563
 564         drm_encoder_helper_add(&intel_encoder->enc, &intel_crt_helper_funcs);
 565         drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs);
 566
 567         drm_sysfs_connector_add(connector);
 568
 569         if (I915_HAS_HOTPLUG(dev))
 570                 connector->polled = DRM_CONNECTOR_POLL_HPD;
 571         else
 572                 connector->polled = DRM_CONNECTOR_POLL_CONNECT;
 573
 574         dev_priv->hotplug_supported_mask |= CRT_HOTPLUG_INT_STATUS;
 575 }