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/i2c.h> 12 #include <linux/dmi.h> 13 #include <drm/drmP.h> 14 15 #include "intel_bios.h" 16 #include "psb_drv.h" 17 #include "psb_intel_drv.h" 18 #include "psb_intel_reg.h" 19 #include "power.h" 20 #include <linux/pm_runtime.h> 21 #include "cdv_device.h" 22 23 /** 24 * LVDS I2C backlight control macros 25 */ 26 #define BRIGHTNESS_MAX_LEVEL 100 27 #define BRIGHTNESS_MASK 0xFF 28 #define BLC_I2C_TYPE 0x01 29 #define BLC_PWM_TYPT 0x02 30 31 #define BLC_POLARITY_NORMAL 0 32 #define BLC_POLARITY_INVERSE 1 33 34 #define PSB_BLC_MAX_PWM_REG_FREQ (0xFFFE) 35 #define PSB_BLC_MIN_PWM_REG_FREQ (0x2) 36 #define PSB_BLC_PWM_PRECISION_FACTOR (10) 37 #define PSB_BACKLIGHT_PWM_CTL_SHIFT (16) 38 #define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE) 39 40 struct cdv_intel_lvds_priv { 41 /** 42 * Saved LVDO output states 43 */ 44 uint32_t savePP_ON; 45 uint32_t savePP_OFF; 46 uint32_t saveLVDS; 47 uint32_t savePP_CONTROL; 48 uint32_t savePP_CYCLE; 49 uint32_t savePFIT_CONTROL; 50 uint32_t savePFIT_PGM_RATIOS; 51 uint32_t saveBLC_PWM_CTL; 52 }; 53 54 /* 55 * Returns the maximum level of the backlight duty cycle field. 56 */ 57 static u32 cdv_intel_lvds_get_max_backlight(struct drm_device *dev) 58 { 59 struct drm_psb_private *dev_priv = dev->dev_private; 60 u32 retval; 61 62 if (gma_power_begin(dev, false)) { 63 retval = ((REG_READ(BLC_PWM_CTL) & 64 BACKLIGHT_MODULATION_FREQ_MASK) >> 65 BACKLIGHT_MODULATION_FREQ_SHIFT) * 2; 66 67 gma_power_end(dev); 68 } else 69 retval = ((dev_priv->regs.saveBLC_PWM_CTL & 70 BACKLIGHT_MODULATION_FREQ_MASK) >> 71 BACKLIGHT_MODULATION_FREQ_SHIFT) * 2; 72 73 return retval; 74 } 75 76 #if 0 77 /* 78 * Set LVDS backlight level by I2C command 79 */ 80 static int cdv_lvds_i2c_set_brightness(struct drm_device *dev, 81 unsigned int level) 82 { 83 struct drm_psb_private *dev_priv = dev->dev_private; 84 struct psb_intel_i2c_chan *lvds_i2c_bus = dev_priv->lvds_i2c_bus; 85 u8 out_buf[2]; 86 unsigned int blc_i2c_brightness; 87 88 struct i2c_msg msgs[] = { 89 { 90 .addr = lvds_i2c_bus->slave_addr, 91 .flags = 0, 92 .len = 2, 93 .buf = out_buf, 94 } 95 }; 96 97 blc_i2c_brightness = BRIGHTNESS_MASK & ((unsigned int)level * 98 BRIGHTNESS_MASK / 99 BRIGHTNESS_MAX_LEVEL); 100 101 if (dev_priv->lvds_bl->pol == BLC_POLARITY_INVERSE) 102 blc_i2c_brightness = BRIGHTNESS_MASK - blc_i2c_brightness; 103 104 out_buf[0] = dev_priv->lvds_bl->brightnesscmd; 105 out_buf[1] = (u8)blc_i2c_brightness; 106 107 if (i2c_transfer(&lvds_i2c_bus->adapter, msgs, 1) == 1) 108 return 0; 109 110 DRM_ERROR("I2C transfer error\n"); 111 return -1; 112 } 113 114 115 static int cdv_lvds_pwm_set_brightness(struct drm_device *dev, int level) 116 { 117 struct drm_psb_private *dev_priv = dev->dev_private; 118 119 u32 max_pwm_blc; 120 u32 blc_pwm_duty_cycle; 121 122 max_pwm_blc = cdv_intel_lvds_get_max_backlight(dev); 123 124 /*BLC_PWM_CTL Should be initiated while backlight device init*/ 125 BUG_ON((max_pwm_blc & PSB_BLC_MAX_PWM_REG_FREQ) == 0); 126 127 blc_pwm_duty_cycle = level * max_pwm_blc / BRIGHTNESS_MAX_LEVEL; 128 129 if (dev_priv->lvds_bl->pol == BLC_POLARITY_INVERSE) 130 blc_pwm_duty_cycle = max_pwm_blc - blc_pwm_duty_cycle; 131 132 blc_pwm_duty_cycle &= PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR; 133 REG_WRITE(BLC_PWM_CTL, 134 (max_pwm_blc << PSB_BACKLIGHT_PWM_CTL_SHIFT) | 135 (blc_pwm_duty_cycle)); 136 137 return 0; 138 } 139 140 /* 141 * Set LVDS backlight level either by I2C or PWM 142 */ 143 void cdv_intel_lvds_set_brightness(struct drm_device *dev, int level) 144 { 145 struct drm_psb_private *dev_priv = dev->dev_private; 146 147 if (!dev_priv->lvds_bl) { 148 DRM_ERROR("NO LVDS Backlight Info\n"); 149 return; 150 } 151 152 if (dev_priv->lvds_bl->type == BLC_I2C_TYPE) 153 cdv_lvds_i2c_set_brightness(dev, level); 154 else 155 cdv_lvds_pwm_set_brightness(dev, level); 156 } 157 #endif 158 159 /** 160 * Sets the backlight level. 161 * 162 * level backlight level, from 0 to cdv_intel_lvds_get_max_backlight(). 163 */ 164 static void cdv_intel_lvds_set_backlight(struct drm_device *dev, int level) 165 { 166 struct drm_psb_private *dev_priv = dev->dev_private; 167 u32 blc_pwm_ctl; 168 169 if (gma_power_begin(dev, false)) { 170 blc_pwm_ctl = 171 REG_READ(BLC_PWM_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK; 172 REG_WRITE(BLC_PWM_CTL, 173 (blc_pwm_ctl | 174 (level << BACKLIGHT_DUTY_CYCLE_SHIFT))); 175 gma_power_end(dev); 176 } else { 177 blc_pwm_ctl = dev_priv->regs.saveBLC_PWM_CTL & 178 ~BACKLIGHT_DUTY_CYCLE_MASK; 179 dev_priv->regs.saveBLC_PWM_CTL = (blc_pwm_ctl | 180 (level << BACKLIGHT_DUTY_CYCLE_SHIFT)); 181 } 182 } 183 184 /** 185 * Sets the power state for the panel. 186 */ 187 static void cdv_intel_lvds_set_power(struct drm_device *dev, 188 struct drm_encoder *encoder, bool on) 189 { 190 struct drm_psb_private *dev_priv = dev->dev_private; 191 u32 pp_status; 192 193 if (!gma_power_begin(dev, true)) 194 return; 195 196 if (on) { 197 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) | 198 POWER_TARGET_ON); 199 do { 200 pp_status = REG_READ(PP_STATUS); 201 } while ((pp_status & PP_ON) == 0); 202 203 cdv_intel_lvds_set_backlight(dev, 204 dev_priv->mode_dev.backlight_duty_cycle); 205 } else { 206 cdv_intel_lvds_set_backlight(dev, 0); 207 208 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) & 209 ~POWER_TARGET_ON); 210 do { 211 pp_status = REG_READ(PP_STATUS); 212 } while (pp_status & PP_ON); 213 } 214 gma_power_end(dev); 215 } 216 217 static void cdv_intel_lvds_encoder_dpms(struct drm_encoder *encoder, int mode) 218 { 219 struct drm_device *dev = encoder->dev; 220 if (mode == DRM_MODE_DPMS_ON) 221 cdv_intel_lvds_set_power(dev, encoder, true); 222 else 223 cdv_intel_lvds_set_power(dev, encoder, false); 224 /* XXX: We never power down the LVDS pairs. */ 225 } 226 227 static void cdv_intel_lvds_save(struct drm_connector *connector) 228 { 229 } 230 231 static void cdv_intel_lvds_restore(struct drm_connector *connector) 232 { 233 } 234 235 static enum drm_mode_status cdv_intel_lvds_mode_valid(struct drm_connector *connector, 236 struct drm_display_mode *mode) 237 { 238 struct drm_device *dev = connector->dev; 239 struct drm_psb_private *dev_priv = dev->dev_private; 240 struct drm_display_mode *fixed_mode = 241 dev_priv->mode_dev.panel_fixed_mode; 242 243 /* just in case */ 244 if (mode->flags & DRM_MODE_FLAG_DBLSCAN) 245 return MODE_NO_DBLESCAN; 246 247 /* just in case */ 248 if (mode->flags & DRM_MODE_FLAG_INTERLACE) 249 return MODE_NO_INTERLACE; 250 251 if (fixed_mode) { 252 if (mode->hdisplay > fixed_mode->hdisplay) 253 return MODE_PANEL; 254 if (mode->vdisplay > fixed_mode->vdisplay) 255 return MODE_PANEL; 256 } 257 return MODE_OK; 258 } 259 260 static bool cdv_intel_lvds_mode_fixup(struct drm_encoder *encoder, 261 const struct drm_display_mode *mode, 262 struct drm_display_mode *adjusted_mode) 263 { 264 struct drm_device *dev = encoder->dev; 265 struct drm_psb_private *dev_priv = dev->dev_private; 266 struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev; 267 struct drm_encoder *tmp_encoder; 268 struct drm_display_mode *panel_fixed_mode = mode_dev->panel_fixed_mode; 269 270 /* Should never happen!! */ 271 list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, 272 head) { 273 if (tmp_encoder != encoder 274 && tmp_encoder->crtc == encoder->crtc) { 275 pr_err("Can't enable LVDS and another encoder on the same pipe\n"); 276 return false; 277 } 278 } 279 280 /* 281 * If we have timings from the BIOS for the panel, put them in 282 * to the adjusted mode. The CRTC will be set up for this mode, 283 * with the panel scaling set up to source from the H/VDisplay 284 * of the original mode. 285 */ 286 if (panel_fixed_mode != NULL) { 287 adjusted_mode->hdisplay = panel_fixed_mode->hdisplay; 288 adjusted_mode->hsync_start = panel_fixed_mode->hsync_start; 289 adjusted_mode->hsync_end = panel_fixed_mode->hsync_end; 290 adjusted_mode->htotal = panel_fixed_mode->htotal; 291 adjusted_mode->vdisplay = panel_fixed_mode->vdisplay; 292 adjusted_mode->vsync_start = panel_fixed_mode->vsync_start; 293 adjusted_mode->vsync_end = panel_fixed_mode->vsync_end; 294 adjusted_mode->vtotal = panel_fixed_mode->vtotal; 295 adjusted_mode->clock = panel_fixed_mode->clock; 296 drm_mode_set_crtcinfo(adjusted_mode, 297 CRTC_INTERLACE_HALVE_V); 298 } 299 300 /* 301 * XXX: It would be nice to support lower refresh rates on the 302 * panels to reduce power consumption, and perhaps match the 303 * user's requested refresh rate. 304 */ 305 306 return true; 307 } 308 309 static void cdv_intel_lvds_prepare(struct drm_encoder *encoder) 310 { 311 struct drm_device *dev = encoder->dev; 312 struct drm_psb_private *dev_priv = dev->dev_private; 313 struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev; 314 315 if (!gma_power_begin(dev, true)) 316 return; 317 318 mode_dev->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL); 319 mode_dev->backlight_duty_cycle = (mode_dev->saveBLC_PWM_CTL & 320 BACKLIGHT_DUTY_CYCLE_MASK); 321 322 cdv_intel_lvds_set_power(dev, encoder, false); 323 324 gma_power_end(dev); 325 } 326 327 static void cdv_intel_lvds_commit(struct drm_encoder *encoder) 328 { 329 struct drm_device *dev = encoder->dev; 330 struct drm_psb_private *dev_priv = dev->dev_private; 331 struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev; 332 333 if (mode_dev->backlight_duty_cycle == 0) 334 mode_dev->backlight_duty_cycle = 335 cdv_intel_lvds_get_max_backlight(dev); 336 337 cdv_intel_lvds_set_power(dev, encoder, true); 338 } 339 340 static void cdv_intel_lvds_mode_set(struct drm_encoder *encoder, 341 struct drm_display_mode *mode, 342 struct drm_display_mode *adjusted_mode) 343 { 344 struct drm_device *dev = encoder->dev; 345 struct drm_psb_private *dev_priv = dev->dev_private; 346 struct gma_crtc *gma_crtc = to_gma_crtc(encoder->crtc); 347 u32 pfit_control; 348 349 /* 350 * The LVDS pin pair will already have been turned on in the 351 * cdv_intel_crtc_mode_set since it has a large impact on the DPLL 352 * settings. 353 */ 354 355 /* 356 * Enable automatic panel scaling so that non-native modes fill the 357 * screen. Should be enabled before the pipe is enabled, according to 358 * register description and PRM. 359 */ 360 if (mode->hdisplay != adjusted_mode->hdisplay || 361 mode->vdisplay != adjusted_mode->vdisplay) 362 pfit_control = (PFIT_ENABLE | VERT_AUTO_SCALE | 363 HORIZ_AUTO_SCALE | VERT_INTERP_BILINEAR | 364 HORIZ_INTERP_BILINEAR); 365 else 366 pfit_control = 0; 367 368 pfit_control |= gma_crtc->pipe << PFIT_PIPE_SHIFT; 369 370 if (dev_priv->lvds_dither) 371 pfit_control |= PANEL_8TO6_DITHER_ENABLE; 372 373 REG_WRITE(PFIT_CONTROL, pfit_control); 374 } 375 376 /** 377 * Return the list of DDC modes if available, or the BIOS fixed mode otherwise. 378 */ 379 static int cdv_intel_lvds_get_modes(struct drm_connector *connector) 380 { 381 struct drm_device *dev = connector->dev; 382 struct drm_psb_private *dev_priv = dev->dev_private; 383 struct gma_encoder *gma_encoder = gma_attached_encoder(connector); 384 struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev; 385 int ret; 386 387 ret = psb_intel_ddc_get_modes(connector, &gma_encoder->i2c_bus->adapter); 388 389 if (ret) 390 return ret; 391 392 if (mode_dev->panel_fixed_mode != NULL) { 393 struct drm_display_mode *mode = 394 drm_mode_duplicate(dev, mode_dev->panel_fixed_mode); 395 drm_mode_probed_add(connector, mode); 396 return 1; 397 } 398 399 return 0; 400 } 401 402 /** 403 * cdv_intel_lvds_destroy - unregister and free LVDS structures 404 * @connector: connector to free 405 * 406 * Unregister the DDC bus for this connector then free the driver private 407 * structure. 408 */ 409 static void cdv_intel_lvds_destroy(struct drm_connector *connector) 410 { 411 struct gma_encoder *gma_encoder = gma_attached_encoder(connector); 412 413 psb_intel_i2c_destroy(gma_encoder->i2c_bus); 414 drm_connector_unregister(connector); 415 drm_connector_cleanup(connector); 416 kfree(connector); 417 } 418 419 static int cdv_intel_lvds_set_property(struct drm_connector *connector, 420 struct drm_property *property, 421 uint64_t value) 422 { 423 struct drm_encoder *encoder = connector->encoder; 424 425 if (!strcmp(property->name, "scaling mode") && encoder) { 426 struct gma_crtc *crtc = to_gma_crtc(encoder->crtc); 427 uint64_t curValue; 428 429 if (!crtc) 430 return -1; 431 432 switch (value) { 433 case DRM_MODE_SCALE_FULLSCREEN: 434 break; 435 case DRM_MODE_SCALE_NO_SCALE: 436 break; 437 case DRM_MODE_SCALE_ASPECT: 438 break; 439 default: 440 return -1; 441 } 442 443 if (drm_object_property_get_value(&connector->base, 444 property, 445 &curValue)) 446 return -1; 447 448 if (curValue == value) 449 return 0; 450 451 if (drm_object_property_set_value(&connector->base, 452 property, 453 value)) 454 return -1; 455 456 if (crtc->saved_mode.hdisplay != 0 && 457 crtc->saved_mode.vdisplay != 0) { 458 if (!drm_crtc_helper_set_mode(encoder->crtc, 459 &crtc->saved_mode, 460 encoder->crtc->x, 461 encoder->crtc->y, 462 encoder->crtc->primary->fb)) 463 return -1; 464 } 465 } else if (!strcmp(property->name, "backlight") && encoder) { 466 if (drm_object_property_set_value(&connector->base, 467 property, 468 value)) 469 return -1; 470 else 471 gma_backlight_set(encoder->dev, value); 472 } else if (!strcmp(property->name, "DPMS") && encoder) { 473 const struct drm_encoder_helper_funcs *helpers = 474 encoder->helper_private; 475 helpers->dpms(encoder, value); 476 } 477 return 0; 478 } 479 480 static const struct drm_encoder_helper_funcs 481 cdv_intel_lvds_helper_funcs = { 482 .dpms = cdv_intel_lvds_encoder_dpms, 483 .mode_fixup = cdv_intel_lvds_mode_fixup, 484 .prepare = cdv_intel_lvds_prepare, 485 .mode_set = cdv_intel_lvds_mode_set, 486 .commit = cdv_intel_lvds_commit, 487 }; 488 489 static const struct drm_connector_helper_funcs 490 cdv_intel_lvds_connector_helper_funcs = { 491 .get_modes = cdv_intel_lvds_get_modes, 492 .mode_valid = cdv_intel_lvds_mode_valid, 493 .best_encoder = gma_best_encoder, 494 }; 495 496 static const struct drm_connector_funcs cdv_intel_lvds_connector_funcs = { 497 .dpms = drm_helper_connector_dpms, 498 .fill_modes = drm_helper_probe_single_connector_modes, 499 .set_property = cdv_intel_lvds_set_property, 500 .destroy = cdv_intel_lvds_destroy, 501 }; 502 503 504 static void cdv_intel_lvds_enc_destroy(struct drm_encoder *encoder) 505 { 506 drm_encoder_cleanup(encoder); 507 } 508 509 static const struct drm_encoder_funcs cdv_intel_lvds_enc_funcs = { 510 .destroy = cdv_intel_lvds_enc_destroy, 511 }; 512 513 /* 514 * Enumerate the child dev array parsed from VBT to check whether 515 * the LVDS is present. 516 * If it is present, return 1. 517 * If it is not present, return false. 518 * If no child dev is parsed from VBT, it assumes that the LVDS is present. 519 */ 520 static bool lvds_is_present_in_vbt(struct drm_device *dev, 521 u8 *i2c_pin) 522 { 523 struct drm_psb_private *dev_priv = dev->dev_private; 524 int i; 525 526 if (!dev_priv->child_dev_num) 527 return true; 528 529 for (i = 0; i < dev_priv->child_dev_num; i++) { 530 struct child_device_config *child = dev_priv->child_dev + i; 531 532 /* If the device type is not LFP, continue. 533 * We have to check both the new identifiers as well as the 534 * old for compatibility with some BIOSes. 535 */ 536 if (child->device_type != DEVICE_TYPE_INT_LFP && 537 child->device_type != DEVICE_TYPE_LFP) 538 continue; 539 540 if (child->i2c_pin) 541 *i2c_pin = child->i2c_pin; 542 543 /* However, we cannot trust the BIOS writers to populate 544 * the VBT correctly. Since LVDS requires additional 545 * information from AIM blocks, a non-zero addin offset is 546 * a good indicator that the LVDS is actually present. 547 */ 548 if (child->addin_offset) 549 return true; 550 551 /* But even then some BIOS writers perform some black magic 552 * and instantiate the device without reference to any 553 * additional data. Trust that if the VBT was written into 554 * the OpRegion then they have validated the LVDS's existence. 555 */ 556 if (dev_priv->opregion.vbt) 557 return true; 558 } 559 560 return false; 561 } 562 563 /** 564 * cdv_intel_lvds_init - setup LVDS connectors on this device 565 * @dev: drm device 566 * 567 * Create the connector, register the LVDS DDC bus, and try to figure out what 568 * modes we can display on the LVDS panel (if present). 569 */ 570 void cdv_intel_lvds_init(struct drm_device *dev, 571 struct psb_intel_mode_device *mode_dev) 572 { 573 struct gma_encoder *gma_encoder; 574 struct gma_connector *gma_connector; 575 struct cdv_intel_lvds_priv *lvds_priv; 576 struct drm_connector *connector; 577 struct drm_encoder *encoder; 578 struct drm_display_mode *scan; 579 struct drm_crtc *crtc; 580 struct drm_psb_private *dev_priv = dev->dev_private; 581 u32 lvds; 582 int pipe; 583 u8 pin; 584 585 if (!dev_priv->lvds_enabled_in_vbt) 586 return; 587 588 pin = GMBUS_PORT_PANEL; 589 if (!lvds_is_present_in_vbt(dev, &pin)) { 590 DRM_DEBUG_KMS("LVDS is not present in VBT\n"); 591 return; 592 } 593 594 gma_encoder = kzalloc(sizeof(struct gma_encoder), 595 GFP_KERNEL); 596 if (!gma_encoder) 597 return; 598 599 gma_connector = kzalloc(sizeof(struct gma_connector), 600 GFP_KERNEL); 601 if (!gma_connector) 602 goto failed_connector; 603 604 lvds_priv = kzalloc(sizeof(struct cdv_intel_lvds_priv), GFP_KERNEL); 605 if (!lvds_priv) 606 goto failed_lvds_priv; 607 608 gma_encoder->dev_priv = lvds_priv; 609 610 connector = &gma_connector->base; 611 gma_connector->save = cdv_intel_lvds_save; 612 gma_connector->restore = cdv_intel_lvds_restore; 613 encoder = &gma_encoder->base; 614 615 616 drm_connector_init(dev, connector, 617 &cdv_intel_lvds_connector_funcs, 618 DRM_MODE_CONNECTOR_LVDS); 619 620 drm_encoder_init(dev, encoder, 621 &cdv_intel_lvds_enc_funcs, 622 DRM_MODE_ENCODER_LVDS, NULL); 623 624 625 gma_connector_attach_encoder(gma_connector, gma_encoder); 626 gma_encoder->type = INTEL_OUTPUT_LVDS; 627 628 drm_encoder_helper_add(encoder, &cdv_intel_lvds_helper_funcs); 629 drm_connector_helper_add(connector, 630 &cdv_intel_lvds_connector_helper_funcs); 631 connector->display_info.subpixel_order = SubPixelHorizontalRGB; 632 connector->interlace_allowed = false; 633 connector->doublescan_allowed = false; 634 635 /*Attach connector properties*/ 636 drm_object_attach_property(&connector->base, 637 dev->mode_config.scaling_mode_property, 638 DRM_MODE_SCALE_FULLSCREEN); 639 drm_object_attach_property(&connector->base, 640 dev_priv->backlight_property, 641 BRIGHTNESS_MAX_LEVEL); 642 643 /** 644 * Set up I2C bus 645 * FIXME: distroy i2c_bus when exit 646 */ 647 gma_encoder->i2c_bus = psb_intel_i2c_create(dev, 648 GPIOB, 649 "LVDSBLC_B"); 650 if (!gma_encoder->i2c_bus) { 651 dev_printk(KERN_ERR, 652 &dev->pdev->dev, "I2C bus registration failed.\n"); 653 goto failed_blc_i2c; 654 } 655 gma_encoder->i2c_bus->slave_addr = 0x2C; 656 dev_priv->lvds_i2c_bus = gma_encoder->i2c_bus; 657 658 /* 659 * LVDS discovery: 660 * 1) check for EDID on DDC 661 * 2) check for VBT data 662 * 3) check to see if LVDS is already on 663 * if none of the above, no panel 664 * 4) make sure lid is open 665 * if closed, act like it's not there for now 666 */ 667 668 /* Set up the DDC bus. */ 669 gma_encoder->ddc_bus = psb_intel_i2c_create(dev, 670 GPIOC, 671 "LVDSDDC_C"); 672 if (!gma_encoder->ddc_bus) { 673 dev_printk(KERN_ERR, &dev->pdev->dev, 674 "DDC bus registration " "failed.\n"); 675 goto failed_ddc; 676 } 677 678 /* 679 * Attempt to get the fixed panel mode from DDC. Assume that the 680 * preferred mode is the right one. 681 */ 682 mutex_lock(&dev->mode_config.mutex); 683 psb_intel_ddc_get_modes(connector, 684 &gma_encoder->ddc_bus->adapter); 685 list_for_each_entry(scan, &connector->probed_modes, head) { 686 if (scan->type & DRM_MODE_TYPE_PREFERRED) { 687 mode_dev->panel_fixed_mode = 688 drm_mode_duplicate(dev, scan); 689 goto out; /* FIXME: check for quirks */ 690 } 691 } 692 693 /* Failed to get EDID, what about VBT? do we need this?*/ 694 if (dev_priv->lfp_lvds_vbt_mode) { 695 mode_dev->panel_fixed_mode = 696 drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode); 697 if (mode_dev->panel_fixed_mode) { 698 mode_dev->panel_fixed_mode->type |= 699 DRM_MODE_TYPE_PREFERRED; 700 goto out; /* FIXME: check for quirks */ 701 } 702 } 703 /* 704 * If we didn't get EDID, try checking if the panel is already turned 705 * on. If so, assume that whatever is currently programmed is the 706 * correct mode. 707 */ 708 lvds = REG_READ(LVDS); 709 pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0; 710 crtc = psb_intel_get_crtc_from_pipe(dev, pipe); 711 712 if (crtc && (lvds & LVDS_PORT_EN)) { 713 mode_dev->panel_fixed_mode = 714 cdv_intel_crtc_mode_get(dev, crtc); 715 if (mode_dev->panel_fixed_mode) { 716 mode_dev->panel_fixed_mode->type |= 717 DRM_MODE_TYPE_PREFERRED; 718 goto out; /* FIXME: check for quirks */ 719 } 720 } 721 722 /* If we still don't have a mode after all that, give up. */ 723 if (!mode_dev->panel_fixed_mode) { 724 DRM_DEBUG 725 ("Found no modes on the lvds, ignoring the LVDS\n"); 726 goto failed_find; 727 } 728 729 /* setup PWM */ 730 { 731 u32 pwm; 732 733 pwm = REG_READ(BLC_PWM_CTL2); 734 if (pipe == 1) 735 pwm |= PWM_PIPE_B; 736 else 737 pwm &= ~PWM_PIPE_B; 738 pwm |= PWM_ENABLE; 739 REG_WRITE(BLC_PWM_CTL2, pwm); 740 } 741 742 out: 743 mutex_unlock(&dev->mode_config.mutex); 744 drm_connector_register(connector); 745 return; 746 747 failed_find: 748 mutex_unlock(&dev->mode_config.mutex); 749 pr_err("Failed find\n"); 750 psb_intel_i2c_destroy(gma_encoder->ddc_bus); 751 failed_ddc: 752 pr_err("Failed DDC\n"); 753 psb_intel_i2c_destroy(gma_encoder->i2c_bus); 754 failed_blc_i2c: 755 pr_err("Failed BLC\n"); 756 drm_encoder_cleanup(encoder); 757 drm_connector_cleanup(connector); 758 kfree(lvds_priv); 759 failed_lvds_priv: 760 kfree(gma_connector); 761 failed_connector: 762 kfree(gma_encoder); 763 } 764