1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright © 2006-2011 Intel Corporation 4 * 5 * Authors: 6 * Eric Anholt <eric@anholt.net> 7 * Dave Airlie <airlied@linux.ie> 8 * Jesse Barnes <jesse.barnes@intel.com> 9 */ 10 11 #include <linux/dmi.h> 12 #include <linux/i2c.h> 13 #include <linux/pm_runtime.h> 14 15 #include "cdv_device.h" 16 #include "intel_bios.h" 17 #include "power.h" 18 #include "psb_drv.h" 19 #include "psb_intel_drv.h" 20 #include "psb_intel_reg.h" 21 22 /** 23 * LVDS I2C backlight control macros 24 */ 25 #define BRIGHTNESS_MAX_LEVEL 100 26 #define BRIGHTNESS_MASK 0xFF 27 #define BLC_I2C_TYPE 0x01 28 #define BLC_PWM_TYPT 0x02 29 30 #define BLC_POLARITY_NORMAL 0 31 #define BLC_POLARITY_INVERSE 1 32 33 #define PSB_BLC_MAX_PWM_REG_FREQ (0xFFFE) 34 #define PSB_BLC_MIN_PWM_REG_FREQ (0x2) 35 #define PSB_BLC_PWM_PRECISION_FACTOR (10) 36 #define PSB_BACKLIGHT_PWM_CTL_SHIFT (16) 37 #define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE) 38 39 struct cdv_intel_lvds_priv { 40 /** 41 * Saved LVDO output states 42 */ 43 uint32_t savePP_ON; 44 uint32_t savePP_OFF; 45 uint32_t saveLVDS; 46 uint32_t savePP_CONTROL; 47 uint32_t savePP_CYCLE; 48 uint32_t savePFIT_CONTROL; 49 uint32_t savePFIT_PGM_RATIOS; 50 uint32_t saveBLC_PWM_CTL; 51 }; 52 53 /* 54 * Returns the maximum level of the backlight duty cycle field. 55 */ 56 static u32 cdv_intel_lvds_get_max_backlight(struct drm_device *dev) 57 { 58 struct drm_psb_private *dev_priv = dev->dev_private; 59 u32 retval; 60 61 if (gma_power_begin(dev, false)) { 62 retval = ((REG_READ(BLC_PWM_CTL) & 63 BACKLIGHT_MODULATION_FREQ_MASK) >> 64 BACKLIGHT_MODULATION_FREQ_SHIFT) * 2; 65 66 gma_power_end(dev); 67 } else 68 retval = ((dev_priv->regs.saveBLC_PWM_CTL & 69 BACKLIGHT_MODULATION_FREQ_MASK) >> 70 BACKLIGHT_MODULATION_FREQ_SHIFT) * 2; 71 72 return retval; 73 } 74 75 #if 0 76 /* 77 * Set LVDS backlight level by I2C command 78 */ 79 static int cdv_lvds_i2c_set_brightness(struct drm_device *dev, 80 unsigned int level) 81 { 82 struct drm_psb_private *dev_priv = dev->dev_private; 83 struct psb_intel_i2c_chan *lvds_i2c_bus = dev_priv->lvds_i2c_bus; 84 u8 out_buf[2]; 85 unsigned int blc_i2c_brightness; 86 87 struct i2c_msg msgs[] = { 88 { 89 .addr = lvds_i2c_bus->slave_addr, 90 .flags = 0, 91 .len = 2, 92 .buf = out_buf, 93 } 94 }; 95 96 blc_i2c_brightness = BRIGHTNESS_MASK & ((unsigned int)level * 97 BRIGHTNESS_MASK / 98 BRIGHTNESS_MAX_LEVEL); 99 100 if (dev_priv->lvds_bl->pol == BLC_POLARITY_INVERSE) 101 blc_i2c_brightness = BRIGHTNESS_MASK - blc_i2c_brightness; 102 103 out_buf[0] = dev_priv->lvds_bl->brightnesscmd; 104 out_buf[1] = (u8)blc_i2c_brightness; 105 106 if (i2c_transfer(&lvds_i2c_bus->adapter, msgs, 1) == 1) 107 return 0; 108 109 DRM_ERROR("I2C transfer error\n"); 110 return -1; 111 } 112 113 114 static int cdv_lvds_pwm_set_brightness(struct drm_device *dev, int level) 115 { 116 struct drm_psb_private *dev_priv = dev->dev_private; 117 118 u32 max_pwm_blc; 119 u32 blc_pwm_duty_cycle; 120 121 max_pwm_blc = cdv_intel_lvds_get_max_backlight(dev); 122 123 /*BLC_PWM_CTL Should be initiated while backlight device init*/ 124 BUG_ON((max_pwm_blc & PSB_BLC_MAX_PWM_REG_FREQ) == 0); 125 126 blc_pwm_duty_cycle = level * max_pwm_blc / BRIGHTNESS_MAX_LEVEL; 127 128 if (dev_priv->lvds_bl->pol == BLC_POLARITY_INVERSE) 129 blc_pwm_duty_cycle = max_pwm_blc - blc_pwm_duty_cycle; 130 131 blc_pwm_duty_cycle &= PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR; 132 REG_WRITE(BLC_PWM_CTL, 133 (max_pwm_blc << PSB_BACKLIGHT_PWM_CTL_SHIFT) | 134 (blc_pwm_duty_cycle)); 135 136 return 0; 137 } 138 139 /* 140 * Set LVDS backlight level either by I2C or PWM 141 */ 142 void cdv_intel_lvds_set_brightness(struct drm_device *dev, int level) 143 { 144 struct drm_psb_private *dev_priv = dev->dev_private; 145 146 if (!dev_priv->lvds_bl) { 147 DRM_ERROR("NO LVDS Backlight Info\n"); 148 return; 149 } 150 151 if (dev_priv->lvds_bl->type == BLC_I2C_TYPE) 152 cdv_lvds_i2c_set_brightness(dev, level); 153 else 154 cdv_lvds_pwm_set_brightness(dev, level); 155 } 156 #endif 157 158 /** 159 * Sets the backlight level. 160 * 161 * level backlight level, from 0 to cdv_intel_lvds_get_max_backlight(). 162 */ 163 static void cdv_intel_lvds_set_backlight(struct drm_device *dev, int level) 164 { 165 struct drm_psb_private *dev_priv = dev->dev_private; 166 u32 blc_pwm_ctl; 167 168 if (gma_power_begin(dev, false)) { 169 blc_pwm_ctl = 170 REG_READ(BLC_PWM_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK; 171 REG_WRITE(BLC_PWM_CTL, 172 (blc_pwm_ctl | 173 (level << BACKLIGHT_DUTY_CYCLE_SHIFT))); 174 gma_power_end(dev); 175 } else { 176 blc_pwm_ctl = dev_priv->regs.saveBLC_PWM_CTL & 177 ~BACKLIGHT_DUTY_CYCLE_MASK; 178 dev_priv->regs.saveBLC_PWM_CTL = (blc_pwm_ctl | 179 (level << BACKLIGHT_DUTY_CYCLE_SHIFT)); 180 } 181 } 182 183 /** 184 * Sets the power state for the panel. 185 */ 186 static void cdv_intel_lvds_set_power(struct drm_device *dev, 187 struct drm_encoder *encoder, bool on) 188 { 189 struct drm_psb_private *dev_priv = dev->dev_private; 190 u32 pp_status; 191 192 if (!gma_power_begin(dev, true)) 193 return; 194 195 if (on) { 196 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) | 197 POWER_TARGET_ON); 198 do { 199 pp_status = REG_READ(PP_STATUS); 200 } while ((pp_status & PP_ON) == 0); 201 202 cdv_intel_lvds_set_backlight(dev, 203 dev_priv->mode_dev.backlight_duty_cycle); 204 } else { 205 cdv_intel_lvds_set_backlight(dev, 0); 206 207 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) & 208 ~POWER_TARGET_ON); 209 do { 210 pp_status = REG_READ(PP_STATUS); 211 } while (pp_status & PP_ON); 212 } 213 gma_power_end(dev); 214 } 215 216 static void cdv_intel_lvds_encoder_dpms(struct drm_encoder *encoder, int mode) 217 { 218 struct drm_device *dev = encoder->dev; 219 if (mode == DRM_MODE_DPMS_ON) 220 cdv_intel_lvds_set_power(dev, encoder, true); 221 else 222 cdv_intel_lvds_set_power(dev, encoder, false); 223 /* XXX: We never power down the LVDS pairs. */ 224 } 225 226 static void cdv_intel_lvds_save(struct drm_connector *connector) 227 { 228 } 229 230 static void cdv_intel_lvds_restore(struct drm_connector *connector) 231 { 232 } 233 234 static enum drm_mode_status cdv_intel_lvds_mode_valid(struct drm_connector *connector, 235 struct drm_display_mode *mode) 236 { 237 struct drm_device *dev = connector->dev; 238 struct drm_psb_private *dev_priv = dev->dev_private; 239 struct drm_display_mode *fixed_mode = 240 dev_priv->mode_dev.panel_fixed_mode; 241 242 /* just in case */ 243 if (mode->flags & DRM_MODE_FLAG_DBLSCAN) 244 return MODE_NO_DBLESCAN; 245 246 /* just in case */ 247 if (mode->flags & DRM_MODE_FLAG_INTERLACE) 248 return MODE_NO_INTERLACE; 249 250 if (fixed_mode) { 251 if (mode->hdisplay > fixed_mode->hdisplay) 252 return MODE_PANEL; 253 if (mode->vdisplay > fixed_mode->vdisplay) 254 return MODE_PANEL; 255 } 256 return MODE_OK; 257 } 258 259 static bool cdv_intel_lvds_mode_fixup(struct drm_encoder *encoder, 260 const struct drm_display_mode *mode, 261 struct drm_display_mode *adjusted_mode) 262 { 263 struct drm_device *dev = encoder->dev; 264 struct drm_psb_private *dev_priv = dev->dev_private; 265 struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev; 266 struct drm_encoder *tmp_encoder; 267 struct drm_display_mode *panel_fixed_mode = mode_dev->panel_fixed_mode; 268 269 /* Should never happen!! */ 270 list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, 271 head) { 272 if (tmp_encoder != encoder 273 && tmp_encoder->crtc == encoder->crtc) { 274 pr_err("Can't enable LVDS and another encoder on the same pipe\n"); 275 return false; 276 } 277 } 278 279 /* 280 * If we have timings from the BIOS for the panel, put them in 281 * to the adjusted mode. The CRTC will be set up for this mode, 282 * with the panel scaling set up to source from the H/VDisplay 283 * of the original mode. 284 */ 285 if (panel_fixed_mode != NULL) { 286 adjusted_mode->hdisplay = panel_fixed_mode->hdisplay; 287 adjusted_mode->hsync_start = panel_fixed_mode->hsync_start; 288 adjusted_mode->hsync_end = panel_fixed_mode->hsync_end; 289 adjusted_mode->htotal = panel_fixed_mode->htotal; 290 adjusted_mode->vdisplay = panel_fixed_mode->vdisplay; 291 adjusted_mode->vsync_start = panel_fixed_mode->vsync_start; 292 adjusted_mode->vsync_end = panel_fixed_mode->vsync_end; 293 adjusted_mode->vtotal = panel_fixed_mode->vtotal; 294 adjusted_mode->clock = panel_fixed_mode->clock; 295 drm_mode_set_crtcinfo(adjusted_mode, 296 CRTC_INTERLACE_HALVE_V); 297 } 298 299 /* 300 * XXX: It would be nice to support lower refresh rates on the 301 * panels to reduce power consumption, and perhaps match the 302 * user's requested refresh rate. 303 */ 304 305 return true; 306 } 307 308 static void cdv_intel_lvds_prepare(struct drm_encoder *encoder) 309 { 310 struct drm_device *dev = encoder->dev; 311 struct drm_psb_private *dev_priv = dev->dev_private; 312 struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev; 313 314 if (!gma_power_begin(dev, true)) 315 return; 316 317 mode_dev->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL); 318 mode_dev->backlight_duty_cycle = (mode_dev->saveBLC_PWM_CTL & 319 BACKLIGHT_DUTY_CYCLE_MASK); 320 321 cdv_intel_lvds_set_power(dev, encoder, false); 322 323 gma_power_end(dev); 324 } 325 326 static void cdv_intel_lvds_commit(struct drm_encoder *encoder) 327 { 328 struct drm_device *dev = encoder->dev; 329 struct drm_psb_private *dev_priv = dev->dev_private; 330 struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev; 331 332 if (mode_dev->backlight_duty_cycle == 0) 333 mode_dev->backlight_duty_cycle = 334 cdv_intel_lvds_get_max_backlight(dev); 335 336 cdv_intel_lvds_set_power(dev, encoder, true); 337 } 338 339 static void cdv_intel_lvds_mode_set(struct drm_encoder *encoder, 340 struct drm_display_mode *mode, 341 struct drm_display_mode *adjusted_mode) 342 { 343 struct drm_device *dev = encoder->dev; 344 struct drm_psb_private *dev_priv = dev->dev_private; 345 struct gma_crtc *gma_crtc = to_gma_crtc(encoder->crtc); 346 u32 pfit_control; 347 348 /* 349 * The LVDS pin pair will already have been turned on in the 350 * cdv_intel_crtc_mode_set since it has a large impact on the DPLL 351 * settings. 352 */ 353 354 /* 355 * Enable automatic panel scaling so that non-native modes fill the 356 * screen. Should be enabled before the pipe is enabled, according to 357 * register description and PRM. 358 */ 359 if (mode->hdisplay != adjusted_mode->hdisplay || 360 mode->vdisplay != adjusted_mode->vdisplay) 361 pfit_control = (PFIT_ENABLE | VERT_AUTO_SCALE | 362 HORIZ_AUTO_SCALE | VERT_INTERP_BILINEAR | 363 HORIZ_INTERP_BILINEAR); 364 else 365 pfit_control = 0; 366 367 pfit_control |= gma_crtc->pipe << PFIT_PIPE_SHIFT; 368 369 if (dev_priv->lvds_dither) 370 pfit_control |= PANEL_8TO6_DITHER_ENABLE; 371 372 REG_WRITE(PFIT_CONTROL, pfit_control); 373 } 374 375 /** 376 * Return the list of DDC modes if available, or the BIOS fixed mode otherwise. 377 */ 378 static int cdv_intel_lvds_get_modes(struct drm_connector *connector) 379 { 380 struct drm_device *dev = connector->dev; 381 struct drm_psb_private *dev_priv = dev->dev_private; 382 struct gma_encoder *gma_encoder = gma_attached_encoder(connector); 383 struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev; 384 int ret; 385 386 ret = psb_intel_ddc_get_modes(connector, &gma_encoder->i2c_bus->adapter); 387 388 if (ret) 389 return ret; 390 391 if (mode_dev->panel_fixed_mode != NULL) { 392 struct drm_display_mode *mode = 393 drm_mode_duplicate(dev, mode_dev->panel_fixed_mode); 394 drm_mode_probed_add(connector, mode); 395 return 1; 396 } 397 398 return 0; 399 } 400 401 /** 402 * cdv_intel_lvds_destroy - unregister and free LVDS structures 403 * @connector: connector to free 404 * 405 * Unregister the DDC bus for this connector then free the driver private 406 * structure. 407 */ 408 static void cdv_intel_lvds_destroy(struct drm_connector *connector) 409 { 410 struct gma_encoder *gma_encoder = gma_attached_encoder(connector); 411 412 psb_intel_i2c_destroy(gma_encoder->i2c_bus); 413 drm_connector_unregister(connector); 414 drm_connector_cleanup(connector); 415 kfree(connector); 416 } 417 418 static int cdv_intel_lvds_set_property(struct drm_connector *connector, 419 struct drm_property *property, 420 uint64_t value) 421 { 422 struct drm_encoder *encoder = connector->encoder; 423 424 if (!strcmp(property->name, "scaling mode") && encoder) { 425 struct gma_crtc *crtc = to_gma_crtc(encoder->crtc); 426 uint64_t curValue; 427 428 if (!crtc) 429 return -1; 430 431 switch (value) { 432 case DRM_MODE_SCALE_FULLSCREEN: 433 break; 434 case DRM_MODE_SCALE_NO_SCALE: 435 break; 436 case DRM_MODE_SCALE_ASPECT: 437 break; 438 default: 439 return -1; 440 } 441 442 if (drm_object_property_get_value(&connector->base, 443 property, 444 &curValue)) 445 return -1; 446 447 if (curValue == value) 448 return 0; 449 450 if (drm_object_property_set_value(&connector->base, 451 property, 452 value)) 453 return -1; 454 455 if (crtc->saved_mode.hdisplay != 0 && 456 crtc->saved_mode.vdisplay != 0) { 457 if (!drm_crtc_helper_set_mode(encoder->crtc, 458 &crtc->saved_mode, 459 encoder->crtc->x, 460 encoder->crtc->y, 461 encoder->crtc->primary->fb)) 462 return -1; 463 } 464 } else if (!strcmp(property->name, "backlight") && encoder) { 465 if (drm_object_property_set_value(&connector->base, 466 property, 467 value)) 468 return -1; 469 else 470 gma_backlight_set(encoder->dev, value); 471 } else if (!strcmp(property->name, "DPMS") && encoder) { 472 const struct drm_encoder_helper_funcs *helpers = 473 encoder->helper_private; 474 helpers->dpms(encoder, value); 475 } 476 return 0; 477 } 478 479 static const struct drm_encoder_helper_funcs 480 cdv_intel_lvds_helper_funcs = { 481 .dpms = cdv_intel_lvds_encoder_dpms, 482 .mode_fixup = cdv_intel_lvds_mode_fixup, 483 .prepare = cdv_intel_lvds_prepare, 484 .mode_set = cdv_intel_lvds_mode_set, 485 .commit = cdv_intel_lvds_commit, 486 }; 487 488 static const struct drm_connector_helper_funcs 489 cdv_intel_lvds_connector_helper_funcs = { 490 .get_modes = cdv_intel_lvds_get_modes, 491 .mode_valid = cdv_intel_lvds_mode_valid, 492 .best_encoder = gma_best_encoder, 493 }; 494 495 static const struct drm_connector_funcs cdv_intel_lvds_connector_funcs = { 496 .dpms = drm_helper_connector_dpms, 497 .fill_modes = drm_helper_probe_single_connector_modes, 498 .set_property = cdv_intel_lvds_set_property, 499 .destroy = cdv_intel_lvds_destroy, 500 }; 501 502 503 static void cdv_intel_lvds_enc_destroy(struct drm_encoder *encoder) 504 { 505 drm_encoder_cleanup(encoder); 506 } 507 508 static const struct drm_encoder_funcs cdv_intel_lvds_enc_funcs = { 509 .destroy = cdv_intel_lvds_enc_destroy, 510 }; 511 512 /* 513 * Enumerate the child dev array parsed from VBT to check whether 514 * the LVDS is present. 515 * If it is present, return 1. 516 * If it is not present, return false. 517 * If no child dev is parsed from VBT, it assumes that the LVDS is present. 518 */ 519 static bool lvds_is_present_in_vbt(struct drm_device *dev, 520 u8 *i2c_pin) 521 { 522 struct drm_psb_private *dev_priv = dev->dev_private; 523 int i; 524 525 if (!dev_priv->child_dev_num) 526 return true; 527 528 for (i = 0; i < dev_priv->child_dev_num; i++) { 529 struct child_device_config *child = dev_priv->child_dev + i; 530 531 /* If the device type is not LFP, continue. 532 * We have to check both the new identifiers as well as the 533 * old for compatibility with some BIOSes. 534 */ 535 if (child->device_type != DEVICE_TYPE_INT_LFP && 536 child->device_type != DEVICE_TYPE_LFP) 537 continue; 538 539 if (child->i2c_pin) 540 *i2c_pin = child->i2c_pin; 541 542 /* However, we cannot trust the BIOS writers to populate 543 * the VBT correctly. Since LVDS requires additional 544 * information from AIM blocks, a non-zero addin offset is 545 * a good indicator that the LVDS is actually present. 546 */ 547 if (child->addin_offset) 548 return true; 549 550 /* But even then some BIOS writers perform some black magic 551 * and instantiate the device without reference to any 552 * additional data. Trust that if the VBT was written into 553 * the OpRegion then they have validated the LVDS's existence. 554 */ 555 if (dev_priv->opregion.vbt) 556 return true; 557 } 558 559 return false; 560 } 561 562 /** 563 * cdv_intel_lvds_init - setup LVDS connectors on this device 564 * @dev: drm device 565 * 566 * Create the connector, register the LVDS DDC bus, and try to figure out what 567 * modes we can display on the LVDS panel (if present). 568 */ 569 void cdv_intel_lvds_init(struct drm_device *dev, 570 struct psb_intel_mode_device *mode_dev) 571 { 572 struct gma_encoder *gma_encoder; 573 struct gma_connector *gma_connector; 574 struct cdv_intel_lvds_priv *lvds_priv; 575 struct drm_connector *connector; 576 struct drm_encoder *encoder; 577 struct drm_display_mode *scan; 578 struct drm_crtc *crtc; 579 struct drm_psb_private *dev_priv = dev->dev_private; 580 u32 lvds; 581 int pipe; 582 u8 pin; 583 584 if (!dev_priv->lvds_enabled_in_vbt) 585 return; 586 587 pin = GMBUS_PORT_PANEL; 588 if (!lvds_is_present_in_vbt(dev, &pin)) { 589 DRM_DEBUG_KMS("LVDS is not present in VBT\n"); 590 return; 591 } 592 593 gma_encoder = kzalloc(sizeof(struct gma_encoder), 594 GFP_KERNEL); 595 if (!gma_encoder) 596 return; 597 598 gma_connector = kzalloc(sizeof(struct gma_connector), 599 GFP_KERNEL); 600 if (!gma_connector) 601 goto failed_connector; 602 603 lvds_priv = kzalloc(sizeof(struct cdv_intel_lvds_priv), GFP_KERNEL); 604 if (!lvds_priv) 605 goto failed_lvds_priv; 606 607 gma_encoder->dev_priv = lvds_priv; 608 609 connector = &gma_connector->base; 610 gma_connector->save = cdv_intel_lvds_save; 611 gma_connector->restore = cdv_intel_lvds_restore; 612 encoder = &gma_encoder->base; 613 614 615 drm_connector_init(dev, connector, 616 &cdv_intel_lvds_connector_funcs, 617 DRM_MODE_CONNECTOR_LVDS); 618 619 drm_encoder_init(dev, encoder, 620 &cdv_intel_lvds_enc_funcs, 621 DRM_MODE_ENCODER_LVDS, NULL); 622 623 624 gma_connector_attach_encoder(gma_connector, gma_encoder); 625 gma_encoder->type = INTEL_OUTPUT_LVDS; 626 627 drm_encoder_helper_add(encoder, &cdv_intel_lvds_helper_funcs); 628 drm_connector_helper_add(connector, 629 &cdv_intel_lvds_connector_helper_funcs); 630 connector->display_info.subpixel_order = SubPixelHorizontalRGB; 631 connector->interlace_allowed = false; 632 connector->doublescan_allowed = false; 633 634 /*Attach connector properties*/ 635 drm_object_attach_property(&connector->base, 636 dev->mode_config.scaling_mode_property, 637 DRM_MODE_SCALE_FULLSCREEN); 638 drm_object_attach_property(&connector->base, 639 dev_priv->backlight_property, 640 BRIGHTNESS_MAX_LEVEL); 641 642 /** 643 * Set up I2C bus 644 * FIXME: distroy i2c_bus when exit 645 */ 646 gma_encoder->i2c_bus = psb_intel_i2c_create(dev, 647 GPIOB, 648 "LVDSBLC_B"); 649 if (!gma_encoder->i2c_bus) { 650 dev_printk(KERN_ERR, 651 &dev->pdev->dev, "I2C bus registration failed.\n"); 652 goto failed_blc_i2c; 653 } 654 gma_encoder->i2c_bus->slave_addr = 0x2C; 655 dev_priv->lvds_i2c_bus = gma_encoder->i2c_bus; 656 657 /* 658 * LVDS discovery: 659 * 1) check for EDID on DDC 660 * 2) check for VBT data 661 * 3) check to see if LVDS is already on 662 * if none of the above, no panel 663 * 4) make sure lid is open 664 * if closed, act like it's not there for now 665 */ 666 667 /* Set up the DDC bus. */ 668 gma_encoder->ddc_bus = psb_intel_i2c_create(dev, 669 GPIOC, 670 "LVDSDDC_C"); 671 if (!gma_encoder->ddc_bus) { 672 dev_printk(KERN_ERR, &dev->pdev->dev, 673 "DDC bus registration " "failed.\n"); 674 goto failed_ddc; 675 } 676 677 /* 678 * Attempt to get the fixed panel mode from DDC. Assume that the 679 * preferred mode is the right one. 680 */ 681 mutex_lock(&dev->mode_config.mutex); 682 psb_intel_ddc_get_modes(connector, 683 &gma_encoder->ddc_bus->adapter); 684 list_for_each_entry(scan, &connector->probed_modes, head) { 685 if (scan->type & DRM_MODE_TYPE_PREFERRED) { 686 mode_dev->panel_fixed_mode = 687 drm_mode_duplicate(dev, scan); 688 goto out; /* FIXME: check for quirks */ 689 } 690 } 691 692 /* Failed to get EDID, what about VBT? do we need this?*/ 693 if (dev_priv->lfp_lvds_vbt_mode) { 694 mode_dev->panel_fixed_mode = 695 drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode); 696 if (mode_dev->panel_fixed_mode) { 697 mode_dev->panel_fixed_mode->type |= 698 DRM_MODE_TYPE_PREFERRED; 699 goto out; /* FIXME: check for quirks */ 700 } 701 } 702 /* 703 * If we didn't get EDID, try checking if the panel is already turned 704 * on. If so, assume that whatever is currently programmed is the 705 * correct mode. 706 */ 707 lvds = REG_READ(LVDS); 708 pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0; 709 crtc = psb_intel_get_crtc_from_pipe(dev, pipe); 710 711 if (crtc && (lvds & LVDS_PORT_EN)) { 712 mode_dev->panel_fixed_mode = 713 cdv_intel_crtc_mode_get(dev, crtc); 714 if (mode_dev->panel_fixed_mode) { 715 mode_dev->panel_fixed_mode->type |= 716 DRM_MODE_TYPE_PREFERRED; 717 goto out; /* FIXME: check for quirks */ 718 } 719 } 720 721 /* If we still don't have a mode after all that, give up. */ 722 if (!mode_dev->panel_fixed_mode) { 723 DRM_DEBUG 724 ("Found no modes on the lvds, ignoring the LVDS\n"); 725 goto failed_find; 726 } 727 728 /* setup PWM */ 729 { 730 u32 pwm; 731 732 pwm = REG_READ(BLC_PWM_CTL2); 733 if (pipe == 1) 734 pwm |= PWM_PIPE_B; 735 else 736 pwm &= ~PWM_PIPE_B; 737 pwm |= PWM_ENABLE; 738 REG_WRITE(BLC_PWM_CTL2, pwm); 739 } 740 741 out: 742 mutex_unlock(&dev->mode_config.mutex); 743 drm_connector_register(connector); 744 return; 745 746 failed_find: 747 mutex_unlock(&dev->mode_config.mutex); 748 pr_err("Failed find\n"); 749 psb_intel_i2c_destroy(gma_encoder->ddc_bus); 750 failed_ddc: 751 pr_err("Failed DDC\n"); 752 psb_intel_i2c_destroy(gma_encoder->i2c_bus); 753 failed_blc_i2c: 754 pr_err("Failed BLC\n"); 755 drm_encoder_cleanup(encoder); 756 drm_connector_cleanup(connector); 757 kfree(lvds_priv); 758 failed_lvds_priv: 759 kfree(gma_connector); 760 failed_connector: 761 kfree(gma_encoder); 762 } 763