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 31 #include <drm/drm_atomic_helper.h> 32 #include <drm/drm_crtc.h> 33 #include <drm/drm_edid.h> 34 #include <drm/drm_probe_helper.h> 35 36 #include "i915_drv.h" 37 #include "i915_irq.h" 38 #include "i915_reg.h" 39 #include "intel_connector.h" 40 #include "intel_crt.h" 41 #include "intel_crtc.h" 42 #include "intel_ddi.h" 43 #include "intel_ddi_buf_trans.h" 44 #include "intel_de.h" 45 #include "intel_display_types.h" 46 #include "intel_fdi.h" 47 #include "intel_fifo_underrun.h" 48 #include "intel_gmbus.h" 49 #include "intel_hotplug.h" 50 #include "intel_pch_display.h" 51 #include "intel_pch_refclk.h" 52 53 /* Here's the desired hotplug mode */ 54 #define ADPA_HOTPLUG_BITS (ADPA_CRT_HOTPLUG_PERIOD_128 | \ 55 ADPA_CRT_HOTPLUG_WARMUP_10MS | \ 56 ADPA_CRT_HOTPLUG_SAMPLE_4S | \ 57 ADPA_CRT_HOTPLUG_VOLTAGE_50 | \ 58 ADPA_CRT_HOTPLUG_VOLREF_325MV | \ 59 ADPA_CRT_HOTPLUG_ENABLE) 60 61 struct intel_crt { 62 struct intel_encoder base; 63 /* DPMS state is stored in the connector, which we need in the 64 * encoder's enable/disable callbacks */ 65 struct intel_connector *connector; 66 bool force_hotplug_required; 67 i915_reg_t adpa_reg; 68 }; 69 70 static struct intel_crt *intel_encoder_to_crt(struct intel_encoder *encoder) 71 { 72 return container_of(encoder, struct intel_crt, base); 73 } 74 75 static struct intel_crt *intel_attached_crt(struct intel_connector *connector) 76 { 77 return intel_encoder_to_crt(intel_attached_encoder(connector)); 78 } 79 80 bool intel_crt_port_enabled(struct drm_i915_private *dev_priv, 81 i915_reg_t adpa_reg, enum pipe *pipe) 82 { 83 u32 val; 84 85 val = intel_de_read(dev_priv, adpa_reg); 86 87 /* asserts want to know the pipe even if the port is disabled */ 88 if (HAS_PCH_CPT(dev_priv)) 89 *pipe = (val & ADPA_PIPE_SEL_MASK_CPT) >> ADPA_PIPE_SEL_SHIFT_CPT; 90 else 91 *pipe = (val & ADPA_PIPE_SEL_MASK) >> ADPA_PIPE_SEL_SHIFT; 92 93 return val & ADPA_DAC_ENABLE; 94 } 95 96 static bool intel_crt_get_hw_state(struct intel_encoder *encoder, 97 enum pipe *pipe) 98 { 99 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 100 struct intel_crt *crt = intel_encoder_to_crt(encoder); 101 intel_wakeref_t wakeref; 102 bool ret; 103 104 wakeref = intel_display_power_get_if_enabled(dev_priv, 105 encoder->power_domain); 106 if (!wakeref) 107 return false; 108 109 ret = intel_crt_port_enabled(dev_priv, crt->adpa_reg, pipe); 110 111 intel_display_power_put(dev_priv, encoder->power_domain, wakeref); 112 113 return ret; 114 } 115 116 static unsigned int intel_crt_get_flags(struct intel_encoder *encoder) 117 { 118 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 119 struct intel_crt *crt = intel_encoder_to_crt(encoder); 120 u32 tmp, flags = 0; 121 122 tmp = intel_de_read(dev_priv, crt->adpa_reg); 123 124 if (tmp & ADPA_HSYNC_ACTIVE_HIGH) 125 flags |= DRM_MODE_FLAG_PHSYNC; 126 else 127 flags |= DRM_MODE_FLAG_NHSYNC; 128 129 if (tmp & ADPA_VSYNC_ACTIVE_HIGH) 130 flags |= DRM_MODE_FLAG_PVSYNC; 131 else 132 flags |= DRM_MODE_FLAG_NVSYNC; 133 134 return flags; 135 } 136 137 static void intel_crt_get_config(struct intel_encoder *encoder, 138 struct intel_crtc_state *pipe_config) 139 { 140 pipe_config->output_types |= BIT(INTEL_OUTPUT_ANALOG); 141 142 pipe_config->hw.adjusted_mode.flags |= intel_crt_get_flags(encoder); 143 144 pipe_config->hw.adjusted_mode.crtc_clock = pipe_config->port_clock; 145 } 146 147 static void hsw_crt_get_config(struct intel_encoder *encoder, 148 struct intel_crtc_state *pipe_config) 149 { 150 lpt_pch_get_config(pipe_config); 151 152 hsw_ddi_get_config(encoder, pipe_config); 153 154 pipe_config->hw.adjusted_mode.flags &= ~(DRM_MODE_FLAG_PHSYNC | 155 DRM_MODE_FLAG_NHSYNC | 156 DRM_MODE_FLAG_PVSYNC | 157 DRM_MODE_FLAG_NVSYNC); 158 pipe_config->hw.adjusted_mode.flags |= intel_crt_get_flags(encoder); 159 } 160 161 /* Note: The caller is required to filter out dpms modes not supported by the 162 * platform. */ 163 static void intel_crt_set_dpms(struct intel_encoder *encoder, 164 const struct intel_crtc_state *crtc_state, 165 int mode) 166 { 167 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 168 struct intel_crt *crt = intel_encoder_to_crt(encoder); 169 struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc); 170 const struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode; 171 u32 adpa; 172 173 if (DISPLAY_VER(dev_priv) >= 5) 174 adpa = ADPA_HOTPLUG_BITS; 175 else 176 adpa = 0; 177 178 if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC) 179 adpa |= ADPA_HSYNC_ACTIVE_HIGH; 180 if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC) 181 adpa |= ADPA_VSYNC_ACTIVE_HIGH; 182 183 /* For CPT allow 3 pipe config, for others just use A or B */ 184 if (HAS_PCH_LPT(dev_priv)) 185 ; /* Those bits don't exist here */ 186 else if (HAS_PCH_CPT(dev_priv)) 187 adpa |= ADPA_PIPE_SEL_CPT(crtc->pipe); 188 else 189 adpa |= ADPA_PIPE_SEL(crtc->pipe); 190 191 if (!HAS_PCH_SPLIT(dev_priv)) 192 intel_de_write(dev_priv, BCLRPAT(crtc->pipe), 0); 193 194 switch (mode) { 195 case DRM_MODE_DPMS_ON: 196 adpa |= ADPA_DAC_ENABLE; 197 break; 198 case DRM_MODE_DPMS_STANDBY: 199 adpa |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE; 200 break; 201 case DRM_MODE_DPMS_SUSPEND: 202 adpa |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE; 203 break; 204 case DRM_MODE_DPMS_OFF: 205 adpa |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE; 206 break; 207 } 208 209 intel_de_write(dev_priv, crt->adpa_reg, adpa); 210 } 211 212 static void intel_disable_crt(struct intel_atomic_state *state, 213 struct intel_encoder *encoder, 214 const struct intel_crtc_state *old_crtc_state, 215 const struct drm_connector_state *old_conn_state) 216 { 217 intel_crt_set_dpms(encoder, old_crtc_state, DRM_MODE_DPMS_OFF); 218 } 219 220 static void pch_disable_crt(struct intel_atomic_state *state, 221 struct intel_encoder *encoder, 222 const struct intel_crtc_state *old_crtc_state, 223 const struct drm_connector_state *old_conn_state) 224 { 225 } 226 227 static void pch_post_disable_crt(struct intel_atomic_state *state, 228 struct intel_encoder *encoder, 229 const struct intel_crtc_state *old_crtc_state, 230 const struct drm_connector_state *old_conn_state) 231 { 232 intel_disable_crt(state, encoder, old_crtc_state, old_conn_state); 233 } 234 235 static void hsw_disable_crt(struct intel_atomic_state *state, 236 struct intel_encoder *encoder, 237 const struct intel_crtc_state *old_crtc_state, 238 const struct drm_connector_state *old_conn_state) 239 { 240 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 241 242 drm_WARN_ON(&dev_priv->drm, !old_crtc_state->has_pch_encoder); 243 244 intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, false); 245 } 246 247 static void hsw_post_disable_crt(struct intel_atomic_state *state, 248 struct intel_encoder *encoder, 249 const struct intel_crtc_state *old_crtc_state, 250 const struct drm_connector_state *old_conn_state) 251 { 252 struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->uapi.crtc); 253 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 254 255 intel_crtc_vblank_off(old_crtc_state); 256 257 intel_disable_transcoder(old_crtc_state); 258 259 intel_ddi_disable_transcoder_func(old_crtc_state); 260 261 ilk_pfit_disable(old_crtc_state); 262 263 intel_ddi_disable_pipe_clock(old_crtc_state); 264 265 pch_post_disable_crt(state, encoder, old_crtc_state, old_conn_state); 266 267 lpt_pch_disable(state, crtc); 268 269 hsw_fdi_disable(encoder); 270 271 drm_WARN_ON(&dev_priv->drm, !old_crtc_state->has_pch_encoder); 272 273 intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, true); 274 } 275 276 static void hsw_pre_pll_enable_crt(struct intel_atomic_state *state, 277 struct intel_encoder *encoder, 278 const struct intel_crtc_state *crtc_state, 279 const struct drm_connector_state *conn_state) 280 { 281 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 282 283 drm_WARN_ON(&dev_priv->drm, !crtc_state->has_pch_encoder); 284 285 intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, false); 286 } 287 288 static void hsw_pre_enable_crt(struct intel_atomic_state *state, 289 struct intel_encoder *encoder, 290 const struct intel_crtc_state *crtc_state, 291 const struct drm_connector_state *conn_state) 292 { 293 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 294 struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc); 295 enum pipe pipe = crtc->pipe; 296 297 drm_WARN_ON(&dev_priv->drm, !crtc_state->has_pch_encoder); 298 299 intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false); 300 301 hsw_fdi_link_train(encoder, crtc_state); 302 303 intel_ddi_enable_pipe_clock(encoder, crtc_state); 304 } 305 306 static void hsw_enable_crt(struct intel_atomic_state *state, 307 struct intel_encoder *encoder, 308 const struct intel_crtc_state *crtc_state, 309 const struct drm_connector_state *conn_state) 310 { 311 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 312 struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc); 313 enum pipe pipe = crtc->pipe; 314 315 drm_WARN_ON(&dev_priv->drm, !crtc_state->has_pch_encoder); 316 317 intel_ddi_enable_transcoder_func(encoder, crtc_state); 318 319 intel_enable_transcoder(crtc_state); 320 321 lpt_pch_enable(state, crtc); 322 323 intel_crtc_vblank_on(crtc_state); 324 325 intel_crt_set_dpms(encoder, crtc_state, DRM_MODE_DPMS_ON); 326 327 intel_crtc_wait_for_next_vblank(crtc); 328 intel_crtc_wait_for_next_vblank(crtc); 329 intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true); 330 intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, true); 331 } 332 333 static void intel_enable_crt(struct intel_atomic_state *state, 334 struct intel_encoder *encoder, 335 const struct intel_crtc_state *crtc_state, 336 const struct drm_connector_state *conn_state) 337 { 338 intel_crt_set_dpms(encoder, crtc_state, DRM_MODE_DPMS_ON); 339 } 340 341 static enum drm_mode_status 342 intel_crt_mode_valid(struct drm_connector *connector, 343 struct drm_display_mode *mode) 344 { 345 struct drm_device *dev = connector->dev; 346 struct drm_i915_private *dev_priv = to_i915(dev); 347 int max_dotclk = dev_priv->max_dotclk_freq; 348 int max_clock; 349 350 if (mode->flags & DRM_MODE_FLAG_DBLSCAN) 351 return MODE_NO_DBLESCAN; 352 353 if (mode->clock < 25000) 354 return MODE_CLOCK_LOW; 355 356 if (HAS_PCH_LPT(dev_priv)) 357 max_clock = 180000; 358 else if (IS_VALLEYVIEW(dev_priv)) 359 /* 360 * 270 MHz due to current DPLL limits, 361 * DAC limit supposedly 355 MHz. 362 */ 363 max_clock = 270000; 364 else if (IS_DISPLAY_VER(dev_priv, 3, 4)) 365 max_clock = 400000; 366 else 367 max_clock = 350000; 368 if (mode->clock > max_clock) 369 return MODE_CLOCK_HIGH; 370 371 if (mode->clock > max_dotclk) 372 return MODE_CLOCK_HIGH; 373 374 /* The FDI receiver on LPT only supports 8bpc and only has 2 lanes. */ 375 if (HAS_PCH_LPT(dev_priv) && 376 ilk_get_lanes_required(mode->clock, 270000, 24) > 2) 377 return MODE_CLOCK_HIGH; 378 379 /* HSW/BDW FDI limited to 4k */ 380 if (mode->hdisplay > 4096) 381 return MODE_H_ILLEGAL; 382 383 return MODE_OK; 384 } 385 386 static int intel_crt_compute_config(struct intel_encoder *encoder, 387 struct intel_crtc_state *pipe_config, 388 struct drm_connector_state *conn_state) 389 { 390 struct drm_display_mode *adjusted_mode = 391 &pipe_config->hw.adjusted_mode; 392 393 if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN) 394 return -EINVAL; 395 396 pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB; 397 398 return 0; 399 } 400 401 static int pch_crt_compute_config(struct intel_encoder *encoder, 402 struct intel_crtc_state *pipe_config, 403 struct drm_connector_state *conn_state) 404 { 405 struct drm_display_mode *adjusted_mode = 406 &pipe_config->hw.adjusted_mode; 407 408 if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN) 409 return -EINVAL; 410 411 pipe_config->has_pch_encoder = true; 412 pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB; 413 414 return 0; 415 } 416 417 static int hsw_crt_compute_config(struct intel_encoder *encoder, 418 struct intel_crtc_state *pipe_config, 419 struct drm_connector_state *conn_state) 420 { 421 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 422 struct drm_display_mode *adjusted_mode = 423 &pipe_config->hw.adjusted_mode; 424 425 if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN) 426 return -EINVAL; 427 428 /* HSW/BDW FDI limited to 4k */ 429 if (adjusted_mode->crtc_hdisplay > 4096 || 430 adjusted_mode->crtc_hblank_start > 4096) 431 return -EINVAL; 432 433 pipe_config->has_pch_encoder = true; 434 pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB; 435 436 /* LPT FDI RX only supports 8bpc. */ 437 if (HAS_PCH_LPT(dev_priv)) { 438 if (pipe_config->bw_constrained && pipe_config->pipe_bpp < 24) { 439 drm_dbg_kms(&dev_priv->drm, 440 "LPT only supports 24bpp\n"); 441 return -EINVAL; 442 } 443 444 pipe_config->pipe_bpp = 24; 445 } 446 447 /* FDI must always be 2.7 GHz */ 448 pipe_config->port_clock = 135000 * 2; 449 450 adjusted_mode->crtc_clock = lpt_iclkip(pipe_config); 451 452 return 0; 453 } 454 455 static bool ilk_crt_detect_hotplug(struct drm_connector *connector) 456 { 457 struct drm_device *dev = connector->dev; 458 struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector)); 459 struct drm_i915_private *dev_priv = to_i915(dev); 460 u32 adpa; 461 bool ret; 462 463 /* The first time through, trigger an explicit detection cycle */ 464 if (crt->force_hotplug_required) { 465 bool turn_off_dac = HAS_PCH_SPLIT(dev_priv); 466 u32 save_adpa; 467 468 crt->force_hotplug_required = false; 469 470 save_adpa = adpa = intel_de_read(dev_priv, crt->adpa_reg); 471 drm_dbg_kms(&dev_priv->drm, 472 "trigger hotplug detect cycle: adpa=0x%x\n", adpa); 473 474 adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER; 475 if (turn_off_dac) 476 adpa &= ~ADPA_DAC_ENABLE; 477 478 intel_de_write(dev_priv, crt->adpa_reg, adpa); 479 480 if (intel_de_wait_for_clear(dev_priv, 481 crt->adpa_reg, 482 ADPA_CRT_HOTPLUG_FORCE_TRIGGER, 483 1000)) 484 drm_dbg_kms(&dev_priv->drm, 485 "timed out waiting for FORCE_TRIGGER"); 486 487 if (turn_off_dac) { 488 intel_de_write(dev_priv, crt->adpa_reg, save_adpa); 489 intel_de_posting_read(dev_priv, crt->adpa_reg); 490 } 491 } 492 493 /* Check the status to see if both blue and green are on now */ 494 adpa = intel_de_read(dev_priv, crt->adpa_reg); 495 if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0) 496 ret = true; 497 else 498 ret = false; 499 drm_dbg_kms(&dev_priv->drm, "ironlake hotplug adpa=0x%x, result %d\n", 500 adpa, ret); 501 502 return ret; 503 } 504 505 static bool valleyview_crt_detect_hotplug(struct drm_connector *connector) 506 { 507 struct drm_device *dev = connector->dev; 508 struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector)); 509 struct drm_i915_private *dev_priv = to_i915(dev); 510 bool reenable_hpd; 511 u32 adpa; 512 bool ret; 513 u32 save_adpa; 514 515 /* 516 * Doing a force trigger causes a hpd interrupt to get sent, which can 517 * get us stuck in a loop if we're polling: 518 * - We enable power wells and reset the ADPA 519 * - output_poll_exec does force probe on VGA, triggering a hpd 520 * - HPD handler waits for poll to unlock dev->mode_config.mutex 521 * - output_poll_exec shuts off the ADPA, unlocks 522 * dev->mode_config.mutex 523 * - HPD handler runs, resets ADPA and brings us back to the start 524 * 525 * Just disable HPD interrupts here to prevent this 526 */ 527 reenable_hpd = intel_hpd_disable(dev_priv, crt->base.hpd_pin); 528 529 save_adpa = adpa = intel_de_read(dev_priv, crt->adpa_reg); 530 drm_dbg_kms(&dev_priv->drm, 531 "trigger hotplug detect cycle: adpa=0x%x\n", adpa); 532 533 adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER; 534 535 intel_de_write(dev_priv, crt->adpa_reg, adpa); 536 537 if (intel_de_wait_for_clear(dev_priv, crt->adpa_reg, 538 ADPA_CRT_HOTPLUG_FORCE_TRIGGER, 1000)) { 539 drm_dbg_kms(&dev_priv->drm, 540 "timed out waiting for FORCE_TRIGGER"); 541 intel_de_write(dev_priv, crt->adpa_reg, save_adpa); 542 } 543 544 /* Check the status to see if both blue and green are on now */ 545 adpa = intel_de_read(dev_priv, crt->adpa_reg); 546 if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0) 547 ret = true; 548 else 549 ret = false; 550 551 drm_dbg_kms(&dev_priv->drm, 552 "valleyview hotplug adpa=0x%x, result %d\n", adpa, ret); 553 554 if (reenable_hpd) 555 intel_hpd_enable(dev_priv, crt->base.hpd_pin); 556 557 return ret; 558 } 559 560 static bool intel_crt_detect_hotplug(struct drm_connector *connector) 561 { 562 struct drm_device *dev = connector->dev; 563 struct drm_i915_private *dev_priv = to_i915(dev); 564 u32 stat; 565 bool ret = false; 566 int i, tries = 0; 567 568 if (HAS_PCH_SPLIT(dev_priv)) 569 return ilk_crt_detect_hotplug(connector); 570 571 if (IS_VALLEYVIEW(dev_priv)) 572 return valleyview_crt_detect_hotplug(connector); 573 574 /* 575 * On 4 series desktop, CRT detect sequence need to be done twice 576 * to get a reliable result. 577 */ 578 579 if (IS_G45(dev_priv)) 580 tries = 2; 581 else 582 tries = 1; 583 584 for (i = 0; i < tries ; i++) { 585 /* turn on the FORCE_DETECT */ 586 i915_hotplug_interrupt_update(dev_priv, 587 CRT_HOTPLUG_FORCE_DETECT, 588 CRT_HOTPLUG_FORCE_DETECT); 589 /* wait for FORCE_DETECT to go off */ 590 if (intel_de_wait_for_clear(dev_priv, PORT_HOTPLUG_EN, 591 CRT_HOTPLUG_FORCE_DETECT, 1000)) 592 drm_dbg_kms(&dev_priv->drm, 593 "timed out waiting for FORCE_DETECT to go off"); 594 } 595 596 stat = intel_de_read(dev_priv, PORT_HOTPLUG_STAT); 597 if ((stat & CRT_HOTPLUG_MONITOR_MASK) != CRT_HOTPLUG_MONITOR_NONE) 598 ret = true; 599 600 /* clear the interrupt we just generated, if any */ 601 intel_de_write(dev_priv, PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS); 602 603 i915_hotplug_interrupt_update(dev_priv, CRT_HOTPLUG_FORCE_DETECT, 0); 604 605 return ret; 606 } 607 608 static struct edid *intel_crt_get_edid(struct drm_connector *connector, 609 struct i2c_adapter *i2c) 610 { 611 struct edid *edid; 612 613 edid = drm_get_edid(connector, i2c); 614 615 if (!edid && !intel_gmbus_is_forced_bit(i2c)) { 616 drm_dbg_kms(connector->dev, 617 "CRT GMBUS EDID read failed, retry using GPIO bit-banging\n"); 618 intel_gmbus_force_bit(i2c, true); 619 edid = drm_get_edid(connector, i2c); 620 intel_gmbus_force_bit(i2c, false); 621 } 622 623 return edid; 624 } 625 626 /* local version of intel_ddc_get_modes() to use intel_crt_get_edid() */ 627 static int intel_crt_ddc_get_modes(struct drm_connector *connector, 628 struct i2c_adapter *adapter) 629 { 630 struct edid *edid; 631 int ret; 632 633 edid = intel_crt_get_edid(connector, adapter); 634 if (!edid) 635 return 0; 636 637 ret = intel_connector_update_modes(connector, edid); 638 kfree(edid); 639 640 return ret; 641 } 642 643 static bool intel_crt_detect_ddc(struct drm_connector *connector) 644 { 645 struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector)); 646 struct drm_i915_private *dev_priv = to_i915(crt->base.base.dev); 647 struct edid *edid; 648 struct i2c_adapter *i2c; 649 bool ret = false; 650 651 i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->display.vbt.crt_ddc_pin); 652 edid = intel_crt_get_edid(connector, i2c); 653 654 if (edid) { 655 bool is_digital = edid->input & DRM_EDID_INPUT_DIGITAL; 656 657 /* 658 * This may be a DVI-I connector with a shared DDC 659 * link between analog and digital outputs, so we 660 * have to check the EDID input spec of the attached device. 661 */ 662 if (!is_digital) { 663 drm_dbg_kms(&dev_priv->drm, 664 "CRT detected via DDC:0x50 [EDID]\n"); 665 ret = true; 666 } else { 667 drm_dbg_kms(&dev_priv->drm, 668 "CRT not detected via DDC:0x50 [EDID reports a digital panel]\n"); 669 } 670 } else { 671 drm_dbg_kms(&dev_priv->drm, 672 "CRT not detected via DDC:0x50 [no valid EDID found]\n"); 673 } 674 675 kfree(edid); 676 677 return ret; 678 } 679 680 static enum drm_connector_status 681 intel_crt_load_detect(struct intel_crt *crt, u32 pipe) 682 { 683 struct drm_device *dev = crt->base.base.dev; 684 struct drm_i915_private *dev_priv = to_i915(dev); 685 u32 save_bclrpat; 686 u32 save_vtotal; 687 u32 vtotal, vactive; 688 u32 vsample; 689 u32 vblank, vblank_start, vblank_end; 690 u32 dsl; 691 u8 st00; 692 enum drm_connector_status status; 693 694 drm_dbg_kms(&dev_priv->drm, "starting load-detect on CRT\n"); 695 696 save_bclrpat = intel_de_read(dev_priv, BCLRPAT(pipe)); 697 save_vtotal = intel_de_read(dev_priv, VTOTAL(pipe)); 698 vblank = intel_de_read(dev_priv, VBLANK(pipe)); 699 700 vtotal = ((save_vtotal >> 16) & 0xfff) + 1; 701 vactive = (save_vtotal & 0x7ff) + 1; 702 703 vblank_start = (vblank & 0xfff) + 1; 704 vblank_end = ((vblank >> 16) & 0xfff) + 1; 705 706 /* Set the border color to purple. */ 707 intel_de_write(dev_priv, BCLRPAT(pipe), 0x500050); 708 709 if (DISPLAY_VER(dev_priv) != 2) { 710 u32 pipeconf = intel_de_read(dev_priv, PIPECONF(pipe)); 711 712 intel_de_write(dev_priv, PIPECONF(pipe), 713 pipeconf | PIPECONF_FORCE_BORDER); 714 intel_de_posting_read(dev_priv, PIPECONF(pipe)); 715 /* Wait for next Vblank to substitue 716 * border color for Color info */ 717 intel_crtc_wait_for_next_vblank(intel_crtc_for_pipe(dev_priv, pipe)); 718 st00 = intel_de_read8(dev_priv, _VGA_MSR_WRITE); 719 status = ((st00 & (1 << 4)) != 0) ? 720 connector_status_connected : 721 connector_status_disconnected; 722 723 intel_de_write(dev_priv, PIPECONF(pipe), pipeconf); 724 } else { 725 bool restore_vblank = false; 726 int count, detect; 727 728 /* 729 * If there isn't any border, add some. 730 * Yes, this will flicker 731 */ 732 if (vblank_start <= vactive && vblank_end >= vtotal) { 733 u32 vsync = intel_de_read(dev_priv, VSYNC(pipe)); 734 u32 vsync_start = (vsync & 0xffff) + 1; 735 736 vblank_start = vsync_start; 737 intel_de_write(dev_priv, VBLANK(pipe), 738 (vblank_start - 1) | ((vblank_end - 1) << 16)); 739 restore_vblank = true; 740 } 741 /* sample in the vertical border, selecting the larger one */ 742 if (vblank_start - vactive >= vtotal - vblank_end) 743 vsample = (vblank_start + vactive) >> 1; 744 else 745 vsample = (vtotal + vblank_end) >> 1; 746 747 /* 748 * Wait for the border to be displayed 749 */ 750 while (intel_de_read(dev_priv, PIPEDSL(pipe)) >= vactive) 751 ; 752 while ((dsl = intel_de_read(dev_priv, PIPEDSL(pipe))) <= vsample) 753 ; 754 /* 755 * Watch ST00 for an entire scanline 756 */ 757 detect = 0; 758 count = 0; 759 do { 760 count++; 761 /* Read the ST00 VGA status register */ 762 st00 = intel_de_read8(dev_priv, _VGA_MSR_WRITE); 763 if (st00 & (1 << 4)) 764 detect++; 765 } while ((intel_de_read(dev_priv, PIPEDSL(pipe)) == dsl)); 766 767 /* restore vblank if necessary */ 768 if (restore_vblank) 769 intel_de_write(dev_priv, VBLANK(pipe), vblank); 770 /* 771 * If more than 3/4 of the scanline detected a monitor, 772 * then it is assumed to be present. This works even on i830, 773 * where there isn't any way to force the border color across 774 * the screen 775 */ 776 status = detect * 4 > count * 3 ? 777 connector_status_connected : 778 connector_status_disconnected; 779 } 780 781 /* Restore previous settings */ 782 intel_de_write(dev_priv, BCLRPAT(pipe), save_bclrpat); 783 784 return status; 785 } 786 787 static int intel_spurious_crt_detect_dmi_callback(const struct dmi_system_id *id) 788 { 789 DRM_DEBUG_DRIVER("Skipping CRT detection for %s\n", id->ident); 790 return 1; 791 } 792 793 static const struct dmi_system_id intel_spurious_crt_detect[] = { 794 { 795 .callback = intel_spurious_crt_detect_dmi_callback, 796 .ident = "ACER ZGB", 797 .matches = { 798 DMI_MATCH(DMI_SYS_VENDOR, "ACER"), 799 DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"), 800 }, 801 }, 802 { 803 .callback = intel_spurious_crt_detect_dmi_callback, 804 .ident = "Intel DZ77BH-55K", 805 .matches = { 806 DMI_MATCH(DMI_BOARD_VENDOR, "Intel Corporation"), 807 DMI_MATCH(DMI_BOARD_NAME, "DZ77BH-55K"), 808 }, 809 }, 810 { } 811 }; 812 813 static int 814 intel_crt_detect(struct drm_connector *connector, 815 struct drm_modeset_acquire_ctx *ctx, 816 bool force) 817 { 818 struct drm_i915_private *dev_priv = to_i915(connector->dev); 819 struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector)); 820 struct intel_encoder *intel_encoder = &crt->base; 821 intel_wakeref_t wakeref; 822 int status, ret; 823 struct intel_load_detect_pipe tmp; 824 825 drm_dbg_kms(&dev_priv->drm, "[CONNECTOR:%d:%s] force=%d\n", 826 connector->base.id, connector->name, 827 force); 828 829 if (!INTEL_DISPLAY_ENABLED(dev_priv)) 830 return connector_status_disconnected; 831 832 if (dev_priv->params.load_detect_test) { 833 wakeref = intel_display_power_get(dev_priv, 834 intel_encoder->power_domain); 835 goto load_detect; 836 } 837 838 /* Skip machines without VGA that falsely report hotplug events */ 839 if (dmi_check_system(intel_spurious_crt_detect)) 840 return connector_status_disconnected; 841 842 wakeref = intel_display_power_get(dev_priv, 843 intel_encoder->power_domain); 844 845 if (I915_HAS_HOTPLUG(dev_priv)) { 846 /* We can not rely on the HPD pin always being correctly wired 847 * up, for example many KVM do not pass it through, and so 848 * only trust an assertion that the monitor is connected. 849 */ 850 if (intel_crt_detect_hotplug(connector)) { 851 drm_dbg_kms(&dev_priv->drm, 852 "CRT detected via hotplug\n"); 853 status = connector_status_connected; 854 goto out; 855 } else 856 drm_dbg_kms(&dev_priv->drm, 857 "CRT not detected via hotplug\n"); 858 } 859 860 if (intel_crt_detect_ddc(connector)) { 861 status = connector_status_connected; 862 goto out; 863 } 864 865 /* Load detection is broken on HPD capable machines. Whoever wants a 866 * broken monitor (without edid) to work behind a broken kvm (that fails 867 * to have the right resistors for HP detection) needs to fix this up. 868 * For now just bail out. */ 869 if (I915_HAS_HOTPLUG(dev_priv)) { 870 status = connector_status_disconnected; 871 goto out; 872 } 873 874 load_detect: 875 if (!force) { 876 status = connector->status; 877 goto out; 878 } 879 880 /* for pre-945g platforms use load detect */ 881 ret = intel_get_load_detect_pipe(connector, &tmp, ctx); 882 if (ret > 0) { 883 if (intel_crt_detect_ddc(connector)) 884 status = connector_status_connected; 885 else if (DISPLAY_VER(dev_priv) < 4) 886 status = intel_crt_load_detect(crt, 887 to_intel_crtc(connector->state->crtc)->pipe); 888 else if (dev_priv->params.load_detect_test) 889 status = connector_status_disconnected; 890 else 891 status = connector_status_unknown; 892 intel_release_load_detect_pipe(connector, &tmp, ctx); 893 } else if (ret == 0) { 894 status = connector_status_unknown; 895 } else { 896 status = ret; 897 } 898 899 out: 900 intel_display_power_put(dev_priv, intel_encoder->power_domain, wakeref); 901 902 /* 903 * Make sure the refs for power wells enabled during detect are 904 * dropped to avoid a new detect cycle triggered by HPD polling. 905 */ 906 intel_display_power_flush_work(dev_priv); 907 908 return status; 909 } 910 911 static int intel_crt_get_modes(struct drm_connector *connector) 912 { 913 struct drm_device *dev = connector->dev; 914 struct drm_i915_private *dev_priv = to_i915(dev); 915 struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector)); 916 struct intel_encoder *intel_encoder = &crt->base; 917 intel_wakeref_t wakeref; 918 struct i2c_adapter *i2c; 919 int ret; 920 921 wakeref = intel_display_power_get(dev_priv, 922 intel_encoder->power_domain); 923 924 i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->display.vbt.crt_ddc_pin); 925 ret = intel_crt_ddc_get_modes(connector, i2c); 926 if (ret || !IS_G4X(dev_priv)) 927 goto out; 928 929 /* Try to probe digital port for output in DVI-I -> VGA mode. */ 930 i2c = intel_gmbus_get_adapter(dev_priv, GMBUS_PIN_DPB); 931 ret = intel_crt_ddc_get_modes(connector, i2c); 932 933 out: 934 intel_display_power_put(dev_priv, intel_encoder->power_domain, wakeref); 935 936 return ret; 937 } 938 939 void intel_crt_reset(struct drm_encoder *encoder) 940 { 941 struct drm_i915_private *dev_priv = to_i915(encoder->dev); 942 struct intel_crt *crt = intel_encoder_to_crt(to_intel_encoder(encoder)); 943 944 if (DISPLAY_VER(dev_priv) >= 5) { 945 u32 adpa; 946 947 adpa = intel_de_read(dev_priv, crt->adpa_reg); 948 adpa &= ~ADPA_CRT_HOTPLUG_MASK; 949 adpa |= ADPA_HOTPLUG_BITS; 950 intel_de_write(dev_priv, crt->adpa_reg, adpa); 951 intel_de_posting_read(dev_priv, crt->adpa_reg); 952 953 drm_dbg_kms(&dev_priv->drm, "crt adpa set to 0x%x\n", adpa); 954 crt->force_hotplug_required = true; 955 } 956 957 } 958 959 /* 960 * Routines for controlling stuff on the analog port 961 */ 962 963 static const struct drm_connector_funcs intel_crt_connector_funcs = { 964 .fill_modes = drm_helper_probe_single_connector_modes, 965 .late_register = intel_connector_register, 966 .early_unregister = intel_connector_unregister, 967 .destroy = intel_connector_destroy, 968 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 969 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 970 }; 971 972 static const struct drm_connector_helper_funcs intel_crt_connector_helper_funcs = { 973 .detect_ctx = intel_crt_detect, 974 .mode_valid = intel_crt_mode_valid, 975 .get_modes = intel_crt_get_modes, 976 }; 977 978 static const struct drm_encoder_funcs intel_crt_enc_funcs = { 979 .reset = intel_crt_reset, 980 .destroy = intel_encoder_destroy, 981 }; 982 983 void intel_crt_init(struct drm_i915_private *dev_priv) 984 { 985 struct drm_connector *connector; 986 struct intel_crt *crt; 987 struct intel_connector *intel_connector; 988 i915_reg_t adpa_reg; 989 u32 adpa; 990 991 if (HAS_PCH_SPLIT(dev_priv)) 992 adpa_reg = PCH_ADPA; 993 else if (IS_VALLEYVIEW(dev_priv)) 994 adpa_reg = VLV_ADPA; 995 else 996 adpa_reg = ADPA; 997 998 adpa = intel_de_read(dev_priv, adpa_reg); 999 if ((adpa & ADPA_DAC_ENABLE) == 0) { 1000 /* 1001 * On some machines (some IVB at least) CRT can be 1002 * fused off, but there's no known fuse bit to 1003 * indicate that. On these machine the ADPA register 1004 * works normally, except the DAC enable bit won't 1005 * take. So the only way to tell is attempt to enable 1006 * it and see what happens. 1007 */ 1008 intel_de_write(dev_priv, adpa_reg, 1009 adpa | ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE); 1010 if ((intel_de_read(dev_priv, adpa_reg) & ADPA_DAC_ENABLE) == 0) 1011 return; 1012 intel_de_write(dev_priv, adpa_reg, adpa); 1013 } 1014 1015 crt = kzalloc(sizeof(struct intel_crt), GFP_KERNEL); 1016 if (!crt) 1017 return; 1018 1019 intel_connector = intel_connector_alloc(); 1020 if (!intel_connector) { 1021 kfree(crt); 1022 return; 1023 } 1024 1025 connector = &intel_connector->base; 1026 crt->connector = intel_connector; 1027 drm_connector_init(&dev_priv->drm, &intel_connector->base, 1028 &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA); 1029 1030 drm_encoder_init(&dev_priv->drm, &crt->base.base, &intel_crt_enc_funcs, 1031 DRM_MODE_ENCODER_DAC, "CRT"); 1032 1033 intel_connector_attach_encoder(intel_connector, &crt->base); 1034 1035 crt->base.type = INTEL_OUTPUT_ANALOG; 1036 crt->base.cloneable = BIT(INTEL_OUTPUT_DVO) | BIT(INTEL_OUTPUT_HDMI); 1037 if (IS_I830(dev_priv)) 1038 crt->base.pipe_mask = BIT(PIPE_A); 1039 else 1040 crt->base.pipe_mask = ~0; 1041 1042 if (DISPLAY_VER(dev_priv) != 2) 1043 connector->interlace_allowed = true; 1044 1045 crt->adpa_reg = adpa_reg; 1046 1047 crt->base.power_domain = POWER_DOMAIN_PORT_CRT; 1048 1049 if (I915_HAS_HOTPLUG(dev_priv) && 1050 !dmi_check_system(intel_spurious_crt_detect)) { 1051 crt->base.hpd_pin = HPD_CRT; 1052 crt->base.hotplug = intel_encoder_hotplug; 1053 intel_connector->polled = DRM_CONNECTOR_POLL_HPD; 1054 } else { 1055 intel_connector->polled = DRM_CONNECTOR_POLL_CONNECT; 1056 } 1057 1058 if (HAS_DDI(dev_priv)) { 1059 crt->base.port = PORT_E; 1060 crt->base.get_config = hsw_crt_get_config; 1061 crt->base.get_hw_state = intel_ddi_get_hw_state; 1062 crt->base.compute_config = hsw_crt_compute_config; 1063 crt->base.pre_pll_enable = hsw_pre_pll_enable_crt; 1064 crt->base.pre_enable = hsw_pre_enable_crt; 1065 crt->base.enable = hsw_enable_crt; 1066 crt->base.disable = hsw_disable_crt; 1067 crt->base.post_disable = hsw_post_disable_crt; 1068 crt->base.enable_clock = hsw_ddi_enable_clock; 1069 crt->base.disable_clock = hsw_ddi_disable_clock; 1070 crt->base.is_clock_enabled = hsw_ddi_is_clock_enabled; 1071 1072 intel_ddi_buf_trans_init(&crt->base); 1073 } else { 1074 if (HAS_PCH_SPLIT(dev_priv)) { 1075 crt->base.compute_config = pch_crt_compute_config; 1076 crt->base.disable = pch_disable_crt; 1077 crt->base.post_disable = pch_post_disable_crt; 1078 } else { 1079 crt->base.compute_config = intel_crt_compute_config; 1080 crt->base.disable = intel_disable_crt; 1081 } 1082 crt->base.port = PORT_NONE; 1083 crt->base.get_config = intel_crt_get_config; 1084 crt->base.get_hw_state = intel_crt_get_hw_state; 1085 crt->base.enable = intel_enable_crt; 1086 } 1087 intel_connector->get_hw_state = intel_connector_get_hw_state; 1088 1089 drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs); 1090 1091 /* 1092 * TODO: find a proper way to discover whether we need to set the the 1093 * polarity and link reversal bits or not, instead of relying on the 1094 * BIOS. 1095 */ 1096 if (HAS_PCH_LPT(dev_priv)) { 1097 u32 fdi_config = FDI_RX_POLARITY_REVERSED_LPT | 1098 FDI_RX_LINK_REVERSAL_OVERRIDE; 1099 1100 dev_priv->display.fdi.rx_config = intel_de_read(dev_priv, 1101 FDI_RX_CTL(PIPE_A)) & fdi_config; 1102 } 1103 1104 intel_crt_reset(&crt->base.base); 1105 } 1106