1 /* $NetBSD: intel_crt.c,v 1.2 2021/12/18 23:45:29 riastradh Exp $ */ 2 3 /* 4 * Copyright 2006-2007 Intel Corporation 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice (including the next 14 * paragraph) shall be included in all copies or substantial portions of the 15 * Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 22 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 23 * DEALINGS IN THE SOFTWARE. 24 * 25 * Authors: 26 * Eric Anholt <eric (at) anholt.net> 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: intel_crt.c,v 1.2 2021/12/18 23:45:29 riastradh Exp $"); 31 32 #include <linux/dmi.h> 33 #include <linux/i2c.h> 34 #include <linux/slab.h> 35 36 #include <drm/drm_atomic_helper.h> 37 #include <drm/drm_crtc.h> 38 #include <drm/drm_edid.h> 39 #include <drm/drm_probe_helper.h> 40 #include <drm/i915_drm.h> 41 42 #include "i915_drv.h" 43 #include "intel_connector.h" 44 #include "intel_crt.h" 45 #include "intel_ddi.h" 46 #include "intel_display_types.h" 47 #include "intel_fifo_underrun.h" 48 #include "intel_gmbus.h" 49 #include "intel_hotplug.h" 50 51 /* Here's the desired hotplug mode */ 52 #define ADPA_HOTPLUG_BITS (ADPA_CRT_HOTPLUG_PERIOD_128 | \ 53 ADPA_CRT_HOTPLUG_WARMUP_10MS | \ 54 ADPA_CRT_HOTPLUG_SAMPLE_4S | \ 55 ADPA_CRT_HOTPLUG_VOLTAGE_50 | \ 56 ADPA_CRT_HOTPLUG_VOLREF_325MV | \ 57 ADPA_CRT_HOTPLUG_ENABLE) 58 59 struct intel_crt { 60 struct intel_encoder base; 61 /* DPMS state is stored in the connector, which we need in the 62 * encoder's enable/disable callbacks */ 63 struct intel_connector *connector; 64 bool force_hotplug_required; 65 i915_reg_t adpa_reg; 66 }; 67 68 static struct intel_crt *intel_encoder_to_crt(struct intel_encoder *encoder) 69 { 70 return container_of(encoder, struct intel_crt, base); 71 } 72 73 static struct intel_crt *intel_attached_crt(struct intel_connector *connector) 74 { 75 return intel_encoder_to_crt(intel_attached_encoder(connector)); 76 } 77 78 bool intel_crt_port_enabled(struct drm_i915_private *dev_priv, 79 i915_reg_t adpa_reg, enum pipe *pipe) 80 { 81 u32 val; 82 83 val = I915_READ(adpa_reg); 84 85 /* asserts want to know the pipe even if the port is disabled */ 86 if (HAS_PCH_CPT(dev_priv)) 87 *pipe = (val & ADPA_PIPE_SEL_MASK_CPT) >> ADPA_PIPE_SEL_SHIFT_CPT; 88 else 89 *pipe = (val & ADPA_PIPE_SEL_MASK) >> ADPA_PIPE_SEL_SHIFT; 90 91 return val & ADPA_DAC_ENABLE; 92 } 93 94 static bool intel_crt_get_hw_state(struct intel_encoder *encoder, 95 enum pipe *pipe) 96 { 97 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 98 struct intel_crt *crt = intel_encoder_to_crt(encoder); 99 intel_wakeref_t wakeref; 100 bool ret; 101 102 wakeref = intel_display_power_get_if_enabled(dev_priv, 103 encoder->power_domain); 104 if (!wakeref) 105 return false; 106 107 ret = intel_crt_port_enabled(dev_priv, crt->adpa_reg, pipe); 108 109 intel_display_power_put(dev_priv, encoder->power_domain, wakeref); 110 111 return ret; 112 } 113 114 static unsigned int intel_crt_get_flags(struct intel_encoder *encoder) 115 { 116 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 117 struct intel_crt *crt = intel_encoder_to_crt(encoder); 118 u32 tmp, flags = 0; 119 120 tmp = I915_READ(crt->adpa_reg); 121 122 if (tmp & ADPA_HSYNC_ACTIVE_HIGH) 123 flags |= DRM_MODE_FLAG_PHSYNC; 124 else 125 flags |= DRM_MODE_FLAG_NHSYNC; 126 127 if (tmp & ADPA_VSYNC_ACTIVE_HIGH) 128 flags |= DRM_MODE_FLAG_PVSYNC; 129 else 130 flags |= DRM_MODE_FLAG_NVSYNC; 131 132 return flags; 133 } 134 135 static void intel_crt_get_config(struct intel_encoder *encoder, 136 struct intel_crtc_state *pipe_config) 137 { 138 pipe_config->output_types |= BIT(INTEL_OUTPUT_ANALOG); 139 140 pipe_config->hw.adjusted_mode.flags |= intel_crt_get_flags(encoder); 141 142 pipe_config->hw.adjusted_mode.crtc_clock = pipe_config->port_clock; 143 } 144 145 static void hsw_crt_get_config(struct intel_encoder *encoder, 146 struct intel_crtc_state *pipe_config) 147 { 148 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 149 150 intel_ddi_get_config(encoder, pipe_config); 151 152 pipe_config->hw.adjusted_mode.flags &= ~(DRM_MODE_FLAG_PHSYNC | 153 DRM_MODE_FLAG_NHSYNC | 154 DRM_MODE_FLAG_PVSYNC | 155 DRM_MODE_FLAG_NVSYNC); 156 pipe_config->hw.adjusted_mode.flags |= intel_crt_get_flags(encoder); 157 158 pipe_config->hw.adjusted_mode.crtc_clock = lpt_get_iclkip(dev_priv); 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 (INTEL_GEN(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 I915_WRITE(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 I915_WRITE(crt->adpa_reg, adpa); 210 } 211 212 static void intel_disable_crt(struct intel_encoder *encoder, 213 const struct intel_crtc_state *old_crtc_state, 214 const struct drm_connector_state *old_conn_state) 215 { 216 intel_crt_set_dpms(encoder, old_crtc_state, DRM_MODE_DPMS_OFF); 217 } 218 219 static void pch_disable_crt(struct intel_encoder *encoder, 220 const struct intel_crtc_state *old_crtc_state, 221 const struct drm_connector_state *old_conn_state) 222 { 223 } 224 225 static void pch_post_disable_crt(struct intel_encoder *encoder, 226 const struct intel_crtc_state *old_crtc_state, 227 const struct drm_connector_state *old_conn_state) 228 { 229 intel_disable_crt(encoder, old_crtc_state, old_conn_state); 230 } 231 232 static void hsw_disable_crt(struct intel_encoder *encoder, 233 const struct intel_crtc_state *old_crtc_state, 234 const struct drm_connector_state *old_conn_state) 235 { 236 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 237 238 WARN_ON(!old_crtc_state->has_pch_encoder); 239 240 intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, false); 241 } 242 243 static void hsw_post_disable_crt(struct intel_encoder *encoder, 244 const struct intel_crtc_state *old_crtc_state, 245 const struct drm_connector_state *old_conn_state) 246 { 247 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 248 249 intel_crtc_vblank_off(old_crtc_state); 250 251 intel_disable_pipe(old_crtc_state); 252 253 intel_ddi_disable_transcoder_func(old_crtc_state); 254 255 ilk_pfit_disable(old_crtc_state); 256 257 intel_ddi_disable_pipe_clock(old_crtc_state); 258 259 pch_post_disable_crt(encoder, old_crtc_state, old_conn_state); 260 261 lpt_disable_pch_transcoder(dev_priv); 262 lpt_disable_iclkip(dev_priv); 263 264 intel_ddi_fdi_post_disable(encoder, old_crtc_state, old_conn_state); 265 266 WARN_ON(!old_crtc_state->has_pch_encoder); 267 268 intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, true); 269 } 270 271 static void hsw_pre_pll_enable_crt(struct intel_encoder *encoder, 272 const struct intel_crtc_state *crtc_state, 273 const struct drm_connector_state *conn_state) 274 { 275 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 276 277 WARN_ON(!crtc_state->has_pch_encoder); 278 279 intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, false); 280 } 281 282 static void hsw_pre_enable_crt(struct intel_encoder *encoder, 283 const struct intel_crtc_state *crtc_state, 284 const struct drm_connector_state *conn_state) 285 { 286 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 287 struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc); 288 enum pipe pipe = crtc->pipe; 289 290 WARN_ON(!crtc_state->has_pch_encoder); 291 292 intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false); 293 294 hsw_fdi_link_train(encoder, crtc_state); 295 296 intel_ddi_enable_pipe_clock(crtc_state); 297 } 298 299 static void hsw_enable_crt(struct intel_encoder *encoder, 300 const struct intel_crtc_state *crtc_state, 301 const struct drm_connector_state *conn_state) 302 { 303 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 304 struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc); 305 enum pipe pipe = crtc->pipe; 306 307 WARN_ON(!crtc_state->has_pch_encoder); 308 309 intel_crt_set_dpms(encoder, crtc_state, DRM_MODE_DPMS_ON); 310 311 intel_wait_for_vblank(dev_priv, pipe); 312 intel_wait_for_vblank(dev_priv, pipe); 313 intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true); 314 intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, true); 315 } 316 317 static void intel_enable_crt(struct intel_encoder *encoder, 318 const struct intel_crtc_state *crtc_state, 319 const struct drm_connector_state *conn_state) 320 { 321 intel_crt_set_dpms(encoder, crtc_state, DRM_MODE_DPMS_ON); 322 } 323 324 static enum drm_mode_status 325 intel_crt_mode_valid(struct drm_connector *connector, 326 struct drm_display_mode *mode) 327 { 328 struct drm_device *dev = connector->dev; 329 struct drm_i915_private *dev_priv = to_i915(dev); 330 int max_dotclk = dev_priv->max_dotclk_freq; 331 int max_clock; 332 333 if (mode->flags & DRM_MODE_FLAG_DBLSCAN) 334 return MODE_NO_DBLESCAN; 335 336 if (mode->clock < 25000) 337 return MODE_CLOCK_LOW; 338 339 if (HAS_PCH_LPT(dev_priv)) 340 max_clock = 180000; 341 else if (IS_VALLEYVIEW(dev_priv)) 342 /* 343 * 270 MHz due to current DPLL limits, 344 * DAC limit supposedly 355 MHz. 345 */ 346 max_clock = 270000; 347 else if (IS_GEN_RANGE(dev_priv, 3, 4)) 348 max_clock = 400000; 349 else 350 max_clock = 350000; 351 if (mode->clock > max_clock) 352 return MODE_CLOCK_HIGH; 353 354 if (mode->clock > max_dotclk) 355 return MODE_CLOCK_HIGH; 356 357 /* The FDI receiver on LPT only supports 8bpc and only has 2 lanes. */ 358 if (HAS_PCH_LPT(dev_priv) && 359 ilk_get_lanes_required(mode->clock, 270000, 24) > 2) 360 return MODE_CLOCK_HIGH; 361 362 /* HSW/BDW FDI limited to 4k */ 363 if (mode->hdisplay > 4096) 364 return MODE_H_ILLEGAL; 365 366 return MODE_OK; 367 } 368 369 static int intel_crt_compute_config(struct intel_encoder *encoder, 370 struct intel_crtc_state *pipe_config, 371 struct drm_connector_state *conn_state) 372 { 373 struct drm_display_mode *adjusted_mode = 374 &pipe_config->hw.adjusted_mode; 375 376 if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN) 377 return -EINVAL; 378 379 pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB; 380 381 return 0; 382 } 383 384 static int pch_crt_compute_config(struct intel_encoder *encoder, 385 struct intel_crtc_state *pipe_config, 386 struct drm_connector_state *conn_state) 387 { 388 struct drm_display_mode *adjusted_mode = 389 &pipe_config->hw.adjusted_mode; 390 391 if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN) 392 return -EINVAL; 393 394 pipe_config->has_pch_encoder = true; 395 pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB; 396 397 return 0; 398 } 399 400 static int hsw_crt_compute_config(struct intel_encoder *encoder, 401 struct intel_crtc_state *pipe_config, 402 struct drm_connector_state *conn_state) 403 { 404 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 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 /* HSW/BDW FDI limited to 4k */ 412 if (adjusted_mode->crtc_hdisplay > 4096 || 413 adjusted_mode->crtc_hblank_start > 4096) 414 return -EINVAL; 415 416 pipe_config->has_pch_encoder = true; 417 pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB; 418 419 /* LPT FDI RX only supports 8bpc. */ 420 if (HAS_PCH_LPT(dev_priv)) { 421 if (pipe_config->bw_constrained && pipe_config->pipe_bpp < 24) { 422 DRM_DEBUG_KMS("LPT only supports 24bpp\n"); 423 return -EINVAL; 424 } 425 426 pipe_config->pipe_bpp = 24; 427 } 428 429 /* FDI must always be 2.7 GHz */ 430 pipe_config->port_clock = 135000 * 2; 431 432 return 0; 433 } 434 435 static bool ilk_crt_detect_hotplug(struct drm_connector *connector) 436 { 437 struct drm_device *dev = connector->dev; 438 struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector)); 439 struct drm_i915_private *dev_priv = to_i915(dev); 440 u32 adpa; 441 bool ret; 442 443 /* The first time through, trigger an explicit detection cycle */ 444 if (crt->force_hotplug_required) { 445 bool turn_off_dac = HAS_PCH_SPLIT(dev_priv); 446 u32 save_adpa; 447 448 crt->force_hotplug_required = false; 449 450 save_adpa = adpa = I915_READ(crt->adpa_reg); 451 DRM_DEBUG_KMS("trigger hotplug detect cycle: adpa=0x%x\n", adpa); 452 453 adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER; 454 if (turn_off_dac) 455 adpa &= ~ADPA_DAC_ENABLE; 456 457 I915_WRITE(crt->adpa_reg, adpa); 458 459 if (intel_de_wait_for_clear(dev_priv, 460 crt->adpa_reg, 461 ADPA_CRT_HOTPLUG_FORCE_TRIGGER, 462 1000)) 463 DRM_DEBUG_KMS("timed out waiting for FORCE_TRIGGER"); 464 465 if (turn_off_dac) { 466 I915_WRITE(crt->adpa_reg, save_adpa); 467 POSTING_READ(crt->adpa_reg); 468 } 469 } 470 471 /* Check the status to see if both blue and green are on now */ 472 adpa = I915_READ(crt->adpa_reg); 473 if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0) 474 ret = true; 475 else 476 ret = false; 477 DRM_DEBUG_KMS("ironlake hotplug adpa=0x%x, result %d\n", adpa, ret); 478 479 return ret; 480 } 481 482 static bool valleyview_crt_detect_hotplug(struct drm_connector *connector) 483 { 484 struct drm_device *dev = connector->dev; 485 struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector)); 486 struct drm_i915_private *dev_priv = to_i915(dev); 487 bool reenable_hpd; 488 u32 adpa; 489 bool ret; 490 u32 save_adpa; 491 492 /* 493 * Doing a force trigger causes a hpd interrupt to get sent, which can 494 * get us stuck in a loop if we're polling: 495 * - We enable power wells and reset the ADPA 496 * - output_poll_exec does force probe on VGA, triggering a hpd 497 * - HPD handler waits for poll to unlock dev->mode_config.mutex 498 * - output_poll_exec shuts off the ADPA, unlocks 499 * dev->mode_config.mutex 500 * - HPD handler runs, resets ADPA and brings us back to the start 501 * 502 * Just disable HPD interrupts here to prevent this 503 */ 504 reenable_hpd = intel_hpd_disable(dev_priv, crt->base.hpd_pin); 505 506 save_adpa = adpa = I915_READ(crt->adpa_reg); 507 DRM_DEBUG_KMS("trigger hotplug detect cycle: adpa=0x%x\n", adpa); 508 509 adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER; 510 511 I915_WRITE(crt->adpa_reg, adpa); 512 513 if (intel_de_wait_for_clear(dev_priv, crt->adpa_reg, 514 ADPA_CRT_HOTPLUG_FORCE_TRIGGER, 1000)) { 515 DRM_DEBUG_KMS("timed out waiting for FORCE_TRIGGER"); 516 I915_WRITE(crt->adpa_reg, save_adpa); 517 } 518 519 /* Check the status to see if both blue and green are on now */ 520 adpa = I915_READ(crt->adpa_reg); 521 if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0) 522 ret = true; 523 else 524 ret = false; 525 526 DRM_DEBUG_KMS("valleyview hotplug adpa=0x%x, result %d\n", adpa, ret); 527 528 if (reenable_hpd) 529 intel_hpd_enable(dev_priv, crt->base.hpd_pin); 530 531 return ret; 532 } 533 534 static bool intel_crt_detect_hotplug(struct drm_connector *connector) 535 { 536 struct drm_device *dev = connector->dev; 537 struct drm_i915_private *dev_priv = to_i915(dev); 538 u32 stat; 539 bool ret = false; 540 int i, tries = 0; 541 542 if (HAS_PCH_SPLIT(dev_priv)) 543 return ilk_crt_detect_hotplug(connector); 544 545 if (IS_VALLEYVIEW(dev_priv)) 546 return valleyview_crt_detect_hotplug(connector); 547 548 /* 549 * On 4 series desktop, CRT detect sequence need to be done twice 550 * to get a reliable result. 551 */ 552 553 if (IS_G45(dev_priv)) 554 tries = 2; 555 else 556 tries = 1; 557 558 for (i = 0; i < tries ; i++) { 559 /* turn on the FORCE_DETECT */ 560 i915_hotplug_interrupt_update(dev_priv, 561 CRT_HOTPLUG_FORCE_DETECT, 562 CRT_HOTPLUG_FORCE_DETECT); 563 /* wait for FORCE_DETECT to go off */ 564 if (intel_de_wait_for_clear(dev_priv, PORT_HOTPLUG_EN, 565 CRT_HOTPLUG_FORCE_DETECT, 1000)) 566 DRM_DEBUG_KMS("timed out waiting for FORCE_DETECT to go off"); 567 } 568 569 stat = I915_READ(PORT_HOTPLUG_STAT); 570 if ((stat & CRT_HOTPLUG_MONITOR_MASK) != CRT_HOTPLUG_MONITOR_NONE) 571 ret = true; 572 573 /* clear the interrupt we just generated, if any */ 574 I915_WRITE(PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS); 575 576 i915_hotplug_interrupt_update(dev_priv, CRT_HOTPLUG_FORCE_DETECT, 0); 577 578 return ret; 579 } 580 581 static struct edid *intel_crt_get_edid(struct drm_connector *connector, 582 struct i2c_adapter *i2c) 583 { 584 struct edid *edid; 585 586 edid = drm_get_edid(connector, i2c); 587 588 if (!edid && !intel_gmbus_is_forced_bit(i2c)) { 589 DRM_DEBUG_KMS("CRT GMBUS EDID read failed, retry using GPIO bit-banging\n"); 590 intel_gmbus_force_bit(i2c, true); 591 edid = drm_get_edid(connector, i2c); 592 intel_gmbus_force_bit(i2c, false); 593 } 594 595 return edid; 596 } 597 598 /* local version of intel_ddc_get_modes() to use intel_crt_get_edid() */ 599 static int intel_crt_ddc_get_modes(struct drm_connector *connector, 600 struct i2c_adapter *adapter) 601 { 602 struct edid *edid; 603 int ret; 604 605 edid = intel_crt_get_edid(connector, adapter); 606 if (!edid) 607 return 0; 608 609 ret = intel_connector_update_modes(connector, edid); 610 kfree(edid); 611 612 return ret; 613 } 614 615 static bool intel_crt_detect_ddc(struct drm_connector *connector) 616 { 617 struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector)); 618 struct drm_i915_private *dev_priv = to_i915(crt->base.base.dev); 619 struct edid *edid; 620 struct i2c_adapter *i2c; 621 bool ret = false; 622 623 BUG_ON(crt->base.type != INTEL_OUTPUT_ANALOG); 624 625 i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->vbt.crt_ddc_pin); 626 edid = intel_crt_get_edid(connector, i2c); 627 628 if (edid) { 629 bool is_digital = edid->input & DRM_EDID_INPUT_DIGITAL; 630 631 /* 632 * This may be a DVI-I connector with a shared DDC 633 * link between analog and digital outputs, so we 634 * have to check the EDID input spec of the attached device. 635 */ 636 if (!is_digital) { 637 DRM_DEBUG_KMS("CRT detected via DDC:0x50 [EDID]\n"); 638 ret = true; 639 } else { 640 DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [EDID reports a digital panel]\n"); 641 } 642 } else { 643 DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [no valid EDID found]\n"); 644 } 645 646 kfree(edid); 647 648 return ret; 649 } 650 651 static enum drm_connector_status 652 intel_crt_load_detect(struct intel_crt *crt, u32 pipe) 653 { 654 struct drm_device *dev = crt->base.base.dev; 655 struct drm_i915_private *dev_priv = to_i915(dev); 656 struct intel_uncore *uncore = &dev_priv->uncore; 657 u32 save_bclrpat; 658 u32 save_vtotal; 659 u32 vtotal, vactive; 660 u32 vsample; 661 u32 vblank, vblank_start, vblank_end; 662 u32 dsl; 663 i915_reg_t bclrpat_reg, vtotal_reg, 664 vblank_reg, vsync_reg, pipeconf_reg, pipe_dsl_reg; 665 u8 st00; 666 enum drm_connector_status status; 667 668 DRM_DEBUG_KMS("starting load-detect on CRT\n"); 669 670 bclrpat_reg = BCLRPAT(pipe); 671 vtotal_reg = VTOTAL(pipe); 672 vblank_reg = VBLANK(pipe); 673 vsync_reg = VSYNC(pipe); 674 pipeconf_reg = PIPECONF(pipe); 675 pipe_dsl_reg = PIPEDSL(pipe); 676 677 save_bclrpat = intel_uncore_read(uncore, bclrpat_reg); 678 save_vtotal = intel_uncore_read(uncore, vtotal_reg); 679 vblank = intel_uncore_read(uncore, vblank_reg); 680 681 vtotal = ((save_vtotal >> 16) & 0xfff) + 1; 682 vactive = (save_vtotal & 0x7ff) + 1; 683 684 vblank_start = (vblank & 0xfff) + 1; 685 vblank_end = ((vblank >> 16) & 0xfff) + 1; 686 687 /* Set the border color to purple. */ 688 intel_uncore_write(uncore, bclrpat_reg, 0x500050); 689 690 if (!IS_GEN(dev_priv, 2)) { 691 u32 pipeconf = intel_uncore_read(uncore, pipeconf_reg); 692 intel_uncore_write(uncore, 693 pipeconf_reg, 694 pipeconf | PIPECONF_FORCE_BORDER); 695 intel_uncore_posting_read(uncore, pipeconf_reg); 696 /* Wait for next Vblank to substitue 697 * border color for Color info */ 698 intel_wait_for_vblank(dev_priv, pipe); 699 st00 = intel_uncore_read8(uncore, _VGA_MSR_WRITE); 700 status = ((st00 & (1 << 4)) != 0) ? 701 connector_status_connected : 702 connector_status_disconnected; 703 704 intel_uncore_write(uncore, pipeconf_reg, pipeconf); 705 } else { 706 bool restore_vblank = false; 707 int count, detect; 708 709 /* 710 * If there isn't any border, add some. 711 * Yes, this will flicker 712 */ 713 if (vblank_start <= vactive && vblank_end >= vtotal) { 714 u32 vsync = I915_READ(vsync_reg); 715 u32 vsync_start = (vsync & 0xffff) + 1; 716 717 vblank_start = vsync_start; 718 intel_uncore_write(uncore, 719 vblank_reg, 720 (vblank_start - 1) | 721 ((vblank_end - 1) << 16)); 722 restore_vblank = true; 723 } 724 /* sample in the vertical border, selecting the larger one */ 725 if (vblank_start - vactive >= vtotal - vblank_end) 726 vsample = (vblank_start + vactive) >> 1; 727 else 728 vsample = (vtotal + vblank_end) >> 1; 729 730 /* 731 * Wait for the border to be displayed 732 */ 733 while (intel_uncore_read(uncore, pipe_dsl_reg) >= vactive) 734 ; 735 while ((dsl = intel_uncore_read(uncore, pipe_dsl_reg)) <= 736 vsample) 737 ; 738 /* 739 * Watch ST00 for an entire scanline 740 */ 741 detect = 0; 742 count = 0; 743 do { 744 count++; 745 /* Read the ST00 VGA status register */ 746 st00 = intel_uncore_read8(uncore, _VGA_MSR_WRITE); 747 if (st00 & (1 << 4)) 748 detect++; 749 } while ((intel_uncore_read(uncore, pipe_dsl_reg) == dsl)); 750 751 /* restore vblank if necessary */ 752 if (restore_vblank) 753 intel_uncore_write(uncore, vblank_reg, vblank); 754 /* 755 * If more than 3/4 of the scanline detected a monitor, 756 * then it is assumed to be present. This works even on i830, 757 * where there isn't any way to force the border color across 758 * the screen 759 */ 760 status = detect * 4 > count * 3 ? 761 connector_status_connected : 762 connector_status_disconnected; 763 } 764 765 /* Restore previous settings */ 766 intel_uncore_write(uncore, bclrpat_reg, save_bclrpat); 767 768 return status; 769 } 770 771 static int intel_spurious_crt_detect_dmi_callback(const struct dmi_system_id *id) 772 { 773 DRM_DEBUG_DRIVER("Skipping CRT detection for %s\n", id->ident); 774 return 1; 775 } 776 777 static const struct dmi_system_id intel_spurious_crt_detect[] = { 778 { 779 .callback = intel_spurious_crt_detect_dmi_callback, 780 .ident = "ACER ZGB", 781 .matches = { 782 DMI_MATCH(DMI_SYS_VENDOR, "ACER"), 783 DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"), 784 }, 785 }, 786 { 787 .callback = intel_spurious_crt_detect_dmi_callback, 788 .ident = "Intel DZ77BH-55K", 789 .matches = { 790 DMI_MATCH(DMI_BOARD_VENDOR, "Intel Corporation"), 791 DMI_MATCH(DMI_BOARD_NAME, "DZ77BH-55K"), 792 }, 793 }, 794 { } 795 }; 796 797 static int 798 intel_crt_detect(struct drm_connector *connector, 799 struct drm_modeset_acquire_ctx *ctx, 800 bool force) 801 { 802 struct drm_i915_private *dev_priv = to_i915(connector->dev); 803 struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector)); 804 struct intel_encoder *intel_encoder = &crt->base; 805 intel_wakeref_t wakeref; 806 int status, ret; 807 struct intel_load_detect_pipe tmp; 808 809 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force=%d\n", 810 connector->base.id, connector->name, 811 force); 812 813 if (i915_modparams.load_detect_test) { 814 wakeref = intel_display_power_get(dev_priv, 815 intel_encoder->power_domain); 816 goto load_detect; 817 } 818 819 /* Skip machines without VGA that falsely report hotplug events */ 820 if (dmi_check_system(intel_spurious_crt_detect)) 821 return connector_status_disconnected; 822 823 wakeref = intel_display_power_get(dev_priv, 824 intel_encoder->power_domain); 825 826 if (I915_HAS_HOTPLUG(dev_priv)) { 827 /* We can not rely on the HPD pin always being correctly wired 828 * up, for example many KVM do not pass it through, and so 829 * only trust an assertion that the monitor is connected. 830 */ 831 if (intel_crt_detect_hotplug(connector)) { 832 DRM_DEBUG_KMS("CRT detected via hotplug\n"); 833 status = connector_status_connected; 834 goto out; 835 } else 836 DRM_DEBUG_KMS("CRT not detected via hotplug\n"); 837 } 838 839 if (intel_crt_detect_ddc(connector)) { 840 status = connector_status_connected; 841 goto out; 842 } 843 844 /* Load detection is broken on HPD capable machines. Whoever wants a 845 * broken monitor (without edid) to work behind a broken kvm (that fails 846 * to have the right resistors for HP detection) needs to fix this up. 847 * For now just bail out. */ 848 if (I915_HAS_HOTPLUG(dev_priv)) { 849 status = connector_status_disconnected; 850 goto out; 851 } 852 853 load_detect: 854 if (!force) { 855 status = connector->status; 856 goto out; 857 } 858 859 /* for pre-945g platforms use load detect */ 860 ret = intel_get_load_detect_pipe(connector, &tmp, ctx); 861 if (ret > 0) { 862 if (intel_crt_detect_ddc(connector)) 863 status = connector_status_connected; 864 else if (INTEL_GEN(dev_priv) < 4) 865 status = intel_crt_load_detect(crt, 866 to_intel_crtc(connector->state->crtc)->pipe); 867 else if (i915_modparams.load_detect_test) 868 status = connector_status_disconnected; 869 else 870 status = connector_status_unknown; 871 intel_release_load_detect_pipe(connector, &tmp, ctx); 872 } else if (ret == 0) { 873 status = connector_status_unknown; 874 } else { 875 status = ret; 876 } 877 878 out: 879 intel_display_power_put(dev_priv, intel_encoder->power_domain, wakeref); 880 881 /* 882 * Make sure the refs for power wells enabled during detect are 883 * dropped to avoid a new detect cycle triggered by HPD polling. 884 */ 885 intel_display_power_flush_work(dev_priv); 886 887 return status; 888 } 889 890 static int intel_crt_get_modes(struct drm_connector *connector) 891 { 892 struct drm_device *dev = connector->dev; 893 struct drm_i915_private *dev_priv = to_i915(dev); 894 struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector)); 895 struct intel_encoder *intel_encoder = &crt->base; 896 intel_wakeref_t wakeref; 897 struct i2c_adapter *i2c; 898 int ret; 899 900 wakeref = intel_display_power_get(dev_priv, 901 intel_encoder->power_domain); 902 903 i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->vbt.crt_ddc_pin); 904 ret = intel_crt_ddc_get_modes(connector, i2c); 905 if (ret || !IS_G4X(dev_priv)) 906 goto out; 907 908 /* Try to probe digital port for output in DVI-I -> VGA mode. */ 909 i2c = intel_gmbus_get_adapter(dev_priv, GMBUS_PIN_DPB); 910 ret = intel_crt_ddc_get_modes(connector, i2c); 911 912 out: 913 intel_display_power_put(dev_priv, intel_encoder->power_domain, wakeref); 914 915 return ret; 916 } 917 918 void intel_crt_reset(struct drm_encoder *encoder) 919 { 920 struct drm_i915_private *dev_priv = to_i915(encoder->dev); 921 struct intel_crt *crt = intel_encoder_to_crt(to_intel_encoder(encoder)); 922 923 if (INTEL_GEN(dev_priv) >= 5) { 924 u32 adpa; 925 926 adpa = I915_READ(crt->adpa_reg); 927 adpa &= ~ADPA_CRT_HOTPLUG_MASK; 928 adpa |= ADPA_HOTPLUG_BITS; 929 I915_WRITE(crt->adpa_reg, adpa); 930 POSTING_READ(crt->adpa_reg); 931 932 DRM_DEBUG_KMS("crt adpa set to 0x%x\n", adpa); 933 crt->force_hotplug_required = true; 934 } 935 936 } 937 938 /* 939 * Routines for controlling stuff on the analog port 940 */ 941 942 static const struct drm_connector_funcs intel_crt_connector_funcs = { 943 .fill_modes = drm_helper_probe_single_connector_modes, 944 .late_register = intel_connector_register, 945 .early_unregister = intel_connector_unregister, 946 .destroy = intel_connector_destroy, 947 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 948 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 949 }; 950 951 static const struct drm_connector_helper_funcs intel_crt_connector_helper_funcs = { 952 .detect_ctx = intel_crt_detect, 953 .mode_valid = intel_crt_mode_valid, 954 .get_modes = intel_crt_get_modes, 955 }; 956 957 static const struct drm_encoder_funcs intel_crt_enc_funcs = { 958 .reset = intel_crt_reset, 959 .destroy = intel_encoder_destroy, 960 }; 961 962 void intel_crt_init(struct drm_i915_private *dev_priv) 963 { 964 struct drm_connector *connector; 965 struct intel_crt *crt; 966 struct intel_connector *intel_connector; 967 i915_reg_t adpa_reg; 968 u32 adpa; 969 970 if (HAS_PCH_SPLIT(dev_priv)) 971 adpa_reg = PCH_ADPA; 972 else if (IS_VALLEYVIEW(dev_priv)) 973 adpa_reg = VLV_ADPA; 974 else 975 adpa_reg = ADPA; 976 977 adpa = I915_READ(adpa_reg); 978 if ((adpa & ADPA_DAC_ENABLE) == 0) { 979 /* 980 * On some machines (some IVB at least) CRT can be 981 * fused off, but there's no known fuse bit to 982 * indicate that. On these machine the ADPA register 983 * works normally, except the DAC enable bit won't 984 * take. So the only way to tell is attempt to enable 985 * it and see what happens. 986 */ 987 I915_WRITE(adpa_reg, adpa | ADPA_DAC_ENABLE | 988 ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE); 989 if ((I915_READ(adpa_reg) & ADPA_DAC_ENABLE) == 0) 990 return; 991 I915_WRITE(adpa_reg, adpa); 992 } 993 994 crt = kzalloc(sizeof(struct intel_crt), GFP_KERNEL); 995 if (!crt) 996 return; 997 998 intel_connector = intel_connector_alloc(); 999 if (!intel_connector) { 1000 kfree(crt); 1001 return; 1002 } 1003 1004 connector = &intel_connector->base; 1005 crt->connector = intel_connector; 1006 drm_connector_init(&dev_priv->drm, &intel_connector->base, 1007 &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA); 1008 1009 drm_encoder_init(&dev_priv->drm, &crt->base.base, &intel_crt_enc_funcs, 1010 DRM_MODE_ENCODER_DAC, "CRT"); 1011 1012 intel_connector_attach_encoder(intel_connector, &crt->base); 1013 1014 crt->base.type = INTEL_OUTPUT_ANALOG; 1015 crt->base.cloneable = (1 << INTEL_OUTPUT_DVO) | (1 << INTEL_OUTPUT_HDMI); 1016 if (IS_I830(dev_priv)) 1017 crt->base.pipe_mask = BIT(PIPE_A); 1018 else 1019 crt->base.pipe_mask = ~0; 1020 1021 if (IS_GEN(dev_priv, 2)) 1022 connector->interlace_allowed = 0; 1023 else 1024 connector->interlace_allowed = 1; 1025 connector->doublescan_allowed = 0; 1026 1027 crt->adpa_reg = adpa_reg; 1028 1029 crt->base.power_domain = POWER_DOMAIN_PORT_CRT; 1030 1031 if (I915_HAS_HOTPLUG(dev_priv) && 1032 !dmi_check_system(intel_spurious_crt_detect)) { 1033 crt->base.hpd_pin = HPD_CRT; 1034 crt->base.hotplug = intel_encoder_hotplug; 1035 } 1036 1037 if (HAS_DDI(dev_priv)) { 1038 crt->base.port = PORT_E; 1039 crt->base.get_config = hsw_crt_get_config; 1040 crt->base.get_hw_state = intel_ddi_get_hw_state; 1041 crt->base.compute_config = hsw_crt_compute_config; 1042 crt->base.pre_pll_enable = hsw_pre_pll_enable_crt; 1043 crt->base.pre_enable = hsw_pre_enable_crt; 1044 crt->base.enable = hsw_enable_crt; 1045 crt->base.disable = hsw_disable_crt; 1046 crt->base.post_disable = hsw_post_disable_crt; 1047 } else { 1048 if (HAS_PCH_SPLIT(dev_priv)) { 1049 crt->base.compute_config = pch_crt_compute_config; 1050 crt->base.disable = pch_disable_crt; 1051 crt->base.post_disable = pch_post_disable_crt; 1052 } else { 1053 crt->base.compute_config = intel_crt_compute_config; 1054 crt->base.disable = intel_disable_crt; 1055 } 1056 crt->base.port = PORT_NONE; 1057 crt->base.get_config = intel_crt_get_config; 1058 crt->base.get_hw_state = intel_crt_get_hw_state; 1059 crt->base.enable = intel_enable_crt; 1060 } 1061 intel_connector->get_hw_state = intel_connector_get_hw_state; 1062 1063 drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs); 1064 1065 if (!I915_HAS_HOTPLUG(dev_priv)) 1066 intel_connector->polled = DRM_CONNECTOR_POLL_CONNECT; 1067 1068 /* 1069 * Configure the automatic hotplug detection stuff 1070 */ 1071 crt->force_hotplug_required = false; 1072 1073 /* 1074 * TODO: find a proper way to discover whether we need to set the the 1075 * polarity and link reversal bits or not, instead of relying on the 1076 * BIOS. 1077 */ 1078 if (HAS_PCH_LPT(dev_priv)) { 1079 u32 fdi_config = FDI_RX_POLARITY_REVERSED_LPT | 1080 FDI_RX_LINK_REVERSAL_OVERRIDE; 1081 1082 dev_priv->fdi_rx_config = I915_READ(FDI_RX_CTL(PIPE_A)) & fdi_config; 1083 } 1084 1085 intel_crt_reset(&crt->base.base); 1086 } 1087
Indexes created Sat Sep 20 22:09:52 GMT 2025