1 /* 2 * Copyright © 2006-2011 Intel Corporation 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License along with 14 * this program; if not, write to the Free Software Foundation, Inc., 15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 16 * 17 * Authors: 18 * Eric Anholt <eric@anholt.net> 19 * Dave Airlie <airlied@linux.ie> 20 * Jesse Barnes <jesse.barnes@intel.com> 21 */ 22 23 #include <linux/i2c.h> 24 #include <linux/dmi.h> 25 #include <drm/drmP.h> 26 27 #include "intel_bios.h" 28 #include "psb_drv.h" 29 #include "psb_intel_drv.h" 30 #include "psb_intel_reg.h" 31 #include "power.h" 32 #include <linux/pm_runtime.h> 33 #include "cdv_device.h" 34 35 /** 36 * LVDS I2C backlight control macros 37 */ 38 #define BRIGHTNESS_MAX_LEVEL 100 39 #define BRIGHTNESS_MASK 0xFF 40 #define BLC_I2C_TYPE 0x01 41 #define BLC_PWM_TYPT 0x02 42 43 #define BLC_POLARITY_NORMAL 0 44 #define BLC_POLARITY_INVERSE 1 45 46 #define PSB_BLC_MAX_PWM_REG_FREQ (0xFFFE) 47 #define PSB_BLC_MIN_PWM_REG_FREQ (0x2) 48 #define PSB_BLC_PWM_PRECISION_FACTOR (10) 49 #define PSB_BACKLIGHT_PWM_CTL_SHIFT (16) 50 #define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE) 51 52 struct cdv_intel_lvds_priv { 53 /** 54 * Saved LVDO output states 55 */ 56 uint32_t savePP_ON; 57 uint32_t savePP_OFF; 58 uint32_t saveLVDS; 59 uint32_t savePP_CONTROL; 60 uint32_t savePP_CYCLE; 61 uint32_t savePFIT_CONTROL; 62 uint32_t savePFIT_PGM_RATIOS; 63 uint32_t saveBLC_PWM_CTL; 64 }; 65 66 /* 67 * Returns the maximum level of the backlight duty cycle field. 68 */ 69 static u32 cdv_intel_lvds_get_max_backlight(struct drm_device *dev) 70 { 71 struct drm_psb_private *dev_priv = dev->dev_private; 72 u32 retval; 73 74 if (gma_power_begin(dev, false)) { 75 retval = ((REG_READ(BLC_PWM_CTL) & 76 BACKLIGHT_MODULATION_FREQ_MASK) >> 77 BACKLIGHT_MODULATION_FREQ_SHIFT) * 2; 78 79 gma_power_end(dev); 80 } else 81 retval = ((dev_priv->regs.saveBLC_PWM_CTL & 82 BACKLIGHT_MODULATION_FREQ_MASK) >> 83 BACKLIGHT_MODULATION_FREQ_SHIFT) * 2; 84 85 return retval; 86 } 87 88 #if 0 89 /* 90 * Set LVDS backlight level by I2C command 91 */ 92 static int cdv_lvds_i2c_set_brightness(struct drm_device *dev, 93 unsigned int level) 94 { 95 struct drm_psb_private *dev_priv = dev->dev_private; 96 struct psb_intel_i2c_chan *lvds_i2c_bus = dev_priv->lvds_i2c_bus; 97 u8 out_buf[2]; 98 unsigned int blc_i2c_brightness; 99 100 struct i2c_msg msgs[] = { 101 { 102 .addr = lvds_i2c_bus->slave_addr, 103 .flags = 0, 104 .len = 2, 105 .buf = out_buf, 106 } 107 }; 108 109 blc_i2c_brightness = BRIGHTNESS_MASK & ((unsigned int)level * 110 BRIGHTNESS_MASK / 111 BRIGHTNESS_MAX_LEVEL); 112 113 if (dev_priv->lvds_bl->pol == BLC_POLARITY_INVERSE) 114 blc_i2c_brightness = BRIGHTNESS_MASK - blc_i2c_brightness; 115 116 out_buf[0] = dev_priv->lvds_bl->brightnesscmd; 117 out_buf[1] = (u8)blc_i2c_brightness; 118 119 if (i2c_transfer(&lvds_i2c_bus->adapter, msgs, 1) == 1) 120 return 0; 121 122 DRM_ERROR("I2C transfer error\n"); 123 return -1; 124 } 125 126 127 static int cdv_lvds_pwm_set_brightness(struct drm_device *dev, int level) 128 { 129 struct drm_psb_private *dev_priv = dev->dev_private; 130 131 u32 max_pwm_blc; 132 u32 blc_pwm_duty_cycle; 133 134 max_pwm_blc = cdv_intel_lvds_get_max_backlight(dev); 135 136 /*BLC_PWM_CTL Should be initiated while backlight device init*/ 137 BUG_ON((max_pwm_blc & PSB_BLC_MAX_PWM_REG_FREQ) == 0); 138 139 blc_pwm_duty_cycle = level * max_pwm_blc / BRIGHTNESS_MAX_LEVEL; 140 141 if (dev_priv->lvds_bl->pol == BLC_POLARITY_INVERSE) 142 blc_pwm_duty_cycle = max_pwm_blc - blc_pwm_duty_cycle; 143 144 blc_pwm_duty_cycle &= PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR; 145 REG_WRITE(BLC_PWM_CTL, 146 (max_pwm_blc << PSB_BACKLIGHT_PWM_CTL_SHIFT) | 147 (blc_pwm_duty_cycle)); 148 149 return 0; 150 } 151 152 /* 153 * Set LVDS backlight level either by I2C or PWM 154 */ 155 void cdv_intel_lvds_set_brightness(struct drm_device *dev, int level) 156 { 157 struct drm_psb_private *dev_priv = dev->dev_private; 158 159 if (!dev_priv->lvds_bl) { 160 DRM_ERROR("NO LVDS Backlight Info\n"); 161 return; 162 } 163 164 if (dev_priv->lvds_bl->type == BLC_I2C_TYPE) 165 cdv_lvds_i2c_set_brightness(dev, level); 166 else 167 cdv_lvds_pwm_set_brightness(dev, level); 168 } 169 #endif 170 171 /** 172 * Sets the backlight level. 173 * 174 * level backlight level, from 0 to cdv_intel_lvds_get_max_backlight(). 175 */ 176 static void cdv_intel_lvds_set_backlight(struct drm_device *dev, int level) 177 { 178 struct drm_psb_private *dev_priv = dev->dev_private; 179 u32 blc_pwm_ctl; 180 181 if (gma_power_begin(dev, false)) { 182 blc_pwm_ctl = 183 REG_READ(BLC_PWM_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK; 184 REG_WRITE(BLC_PWM_CTL, 185 (blc_pwm_ctl | 186 (level << BACKLIGHT_DUTY_CYCLE_SHIFT))); 187 gma_power_end(dev); 188 } else { 189 blc_pwm_ctl = dev_priv->regs.saveBLC_PWM_CTL & 190 ~BACKLIGHT_DUTY_CYCLE_MASK; 191 dev_priv->regs.saveBLC_PWM_CTL = (blc_pwm_ctl | 192 (level << BACKLIGHT_DUTY_CYCLE_SHIFT)); 193 } 194 } 195 196 /** 197 * Sets the power state for the panel. 198 */ 199 static void cdv_intel_lvds_set_power(struct drm_device *dev, 200 struct drm_encoder *encoder, bool on) 201 { 202 struct drm_psb_private *dev_priv = dev->dev_private; 203 u32 pp_status; 204 205 if (!gma_power_begin(dev, true)) 206 return; 207 208 if (on) { 209 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) | 210 POWER_TARGET_ON); 211 do { 212 pp_status = REG_READ(PP_STATUS); 213 } while ((pp_status & PP_ON) == 0); 214 215 cdv_intel_lvds_set_backlight(dev, 216 dev_priv->mode_dev.backlight_duty_cycle); 217 } else { 218 cdv_intel_lvds_set_backlight(dev, 0); 219 220 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) & 221 ~POWER_TARGET_ON); 222 do { 223 pp_status = REG_READ(PP_STATUS); 224 } while (pp_status & PP_ON); 225 } 226 gma_power_end(dev); 227 } 228 229 static void cdv_intel_lvds_encoder_dpms(struct drm_encoder *encoder, int mode) 230 { 231 struct drm_device *dev = encoder->dev; 232 if (mode == DRM_MODE_DPMS_ON) 233 cdv_intel_lvds_set_power(dev, encoder, true); 234 else 235 cdv_intel_lvds_set_power(dev, encoder, false); 236 /* XXX: We never power down the LVDS pairs. */ 237 } 238 239 static void cdv_intel_lvds_save(struct drm_connector *connector) 240 { 241 } 242 243 static void cdv_intel_lvds_restore(struct drm_connector *connector) 244 { 245 } 246 247 static enum drm_mode_status cdv_intel_lvds_mode_valid(struct drm_connector *connector, 248 struct drm_display_mode *mode) 249 { 250 struct drm_device *dev = connector->dev; 251 struct drm_psb_private *dev_priv = dev->dev_private; 252 struct drm_display_mode *fixed_mode = 253 dev_priv->mode_dev.panel_fixed_mode; 254 255 /* just in case */ 256 if (mode->flags & DRM_MODE_FLAG_DBLSCAN) 257 return MODE_NO_DBLESCAN; 258 259 /* just in case */ 260 if (mode->flags & DRM_MODE_FLAG_INTERLACE) 261 return MODE_NO_INTERLACE; 262 263 if (fixed_mode) { 264 if (mode->hdisplay > fixed_mode->hdisplay) 265 return MODE_PANEL; 266 if (mode->vdisplay > fixed_mode->vdisplay) 267 return MODE_PANEL; 268 } 269 return MODE_OK; 270 } 271 272 static bool cdv_intel_lvds_mode_fixup(struct drm_encoder *encoder, 273 const struct drm_display_mode *mode, 274 struct drm_display_mode *adjusted_mode) 275 { 276 struct drm_device *dev = encoder->dev; 277 struct drm_psb_private *dev_priv = dev->dev_private; 278 struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev; 279 struct drm_encoder *tmp_encoder; 280 struct drm_display_mode *panel_fixed_mode = mode_dev->panel_fixed_mode; 281 282 /* Should never happen!! */ 283 list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, 284 head) { 285 if (tmp_encoder != encoder 286 && tmp_encoder->crtc == encoder->crtc) { 287 pr_err("Can't enable LVDS and another encoder on the same pipe\n"); 288 return false; 289 } 290 } 291 292 /* 293 * If we have timings from the BIOS for the panel, put them in 294 * to the adjusted mode. The CRTC will be set up for this mode, 295 * with the panel scaling set up to source from the H/VDisplay 296 * of the original mode. 297 */ 298 if (panel_fixed_mode != NULL) { 299 adjusted_mode->hdisplay = panel_fixed_mode->hdisplay; 300 adjusted_mode->hsync_start = panel_fixed_mode->hsync_start; 301 adjusted_mode->hsync_end = panel_fixed_mode->hsync_end; 302 adjusted_mode->htotal = panel_fixed_mode->htotal; 303 adjusted_mode->vdisplay = panel_fixed_mode->vdisplay; 304 adjusted_mode->vsync_start = panel_fixed_mode->vsync_start; 305 adjusted_mode->vsync_end = panel_fixed_mode->vsync_end; 306 adjusted_mode->vtotal = panel_fixed_mode->vtotal; 307 adjusted_mode->clock = panel_fixed_mode->clock; 308 drm_mode_set_crtcinfo(adjusted_mode, 309 CRTC_INTERLACE_HALVE_V); 310 } 311 312 /* 313 * XXX: It would be nice to support lower refresh rates on the 314 * panels to reduce power consumption, and perhaps match the 315 * user's requested refresh rate. 316 */ 317 318 return true; 319 } 320 321 static void cdv_intel_lvds_prepare(struct drm_encoder *encoder) 322 { 323 struct drm_device *dev = encoder->dev; 324 struct drm_psb_private *dev_priv = dev->dev_private; 325 struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev; 326 327 if (!gma_power_begin(dev, true)) 328 return; 329 330 mode_dev->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL); 331 mode_dev->backlight_duty_cycle = (mode_dev->saveBLC_PWM_CTL & 332 BACKLIGHT_DUTY_CYCLE_MASK); 333 334 cdv_intel_lvds_set_power(dev, encoder, false); 335 336 gma_power_end(dev); 337 } 338 339 static void cdv_intel_lvds_commit(struct drm_encoder *encoder) 340 { 341 struct drm_device *dev = encoder->dev; 342 struct drm_psb_private *dev_priv = dev->dev_private; 343 struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev; 344 345 if (mode_dev->backlight_duty_cycle == 0) 346 mode_dev->backlight_duty_cycle = 347 cdv_intel_lvds_get_max_backlight(dev); 348 349 cdv_intel_lvds_set_power(dev, encoder, true); 350 } 351 352 static void cdv_intel_lvds_mode_set(struct drm_encoder *encoder, 353 struct drm_display_mode *mode, 354 struct drm_display_mode *adjusted_mode) 355 { 356 struct drm_device *dev = encoder->dev; 357 struct drm_psb_private *dev_priv = dev->dev_private; 358 struct gma_crtc *gma_crtc = to_gma_crtc(encoder->crtc); 359 u32 pfit_control; 360 361 /* 362 * The LVDS pin pair will already have been turned on in the 363 * cdv_intel_crtc_mode_set since it has a large impact on the DPLL 364 * settings. 365 */ 366 367 /* 368 * Enable automatic panel scaling so that non-native modes fill the 369 * screen. Should be enabled before the pipe is enabled, according to 370 * register description and PRM. 371 */ 372 if (mode->hdisplay != adjusted_mode->hdisplay || 373 mode->vdisplay != adjusted_mode->vdisplay) 374 pfit_control = (PFIT_ENABLE | VERT_AUTO_SCALE | 375 HORIZ_AUTO_SCALE | VERT_INTERP_BILINEAR | 376 HORIZ_INTERP_BILINEAR); 377 else 378 pfit_control = 0; 379 380 pfit_control |= gma_crtc->pipe << PFIT_PIPE_SHIFT; 381 382 if (dev_priv->lvds_dither) 383 pfit_control |= PANEL_8TO6_DITHER_ENABLE; 384 385 REG_WRITE(PFIT_CONTROL, pfit_control); 386 } 387 388 /** 389 * Return the list of DDC modes if available, or the BIOS fixed mode otherwise. 390 */ 391 static int cdv_intel_lvds_get_modes(struct drm_connector *connector) 392 { 393 struct drm_device *dev = connector->dev; 394 struct drm_psb_private *dev_priv = dev->dev_private; 395 struct gma_encoder *gma_encoder = gma_attached_encoder(connector); 396 struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev; 397 int ret; 398 399 ret = psb_intel_ddc_get_modes(connector, &gma_encoder->i2c_bus->adapter); 400 401 if (ret) 402 return ret; 403 404 if (mode_dev->panel_fixed_mode != NULL) { 405 struct drm_display_mode *mode = 406 drm_mode_duplicate(dev, mode_dev->panel_fixed_mode); 407 drm_mode_probed_add(connector, mode); 408 return 1; 409 } 410 411 return 0; 412 } 413 414 /** 415 * cdv_intel_lvds_destroy - unregister and free LVDS structures 416 * @connector: connector to free 417 * 418 * Unregister the DDC bus for this connector then free the driver private 419 * structure. 420 */ 421 static void cdv_intel_lvds_destroy(struct drm_connector *connector) 422 { 423 struct gma_encoder *gma_encoder = gma_attached_encoder(connector); 424 425 psb_intel_i2c_destroy(gma_encoder->i2c_bus); 426 drm_connector_unregister(connector); 427 drm_connector_cleanup(connector); 428 kfree(connector); 429 } 430 431 static int cdv_intel_lvds_set_property(struct drm_connector *connector, 432 struct drm_property *property, 433 uint64_t value) 434 { 435 struct drm_encoder *encoder = connector->encoder; 436 437 if (!strcmp(property->name, "scaling mode") && encoder) { 438 struct gma_crtc *crtc = to_gma_crtc(encoder->crtc); 439 uint64_t curValue; 440 441 if (!crtc) 442 return -1; 443 444 switch (value) { 445 case DRM_MODE_SCALE_FULLSCREEN: 446 break; 447 case DRM_MODE_SCALE_NO_SCALE: 448 break; 449 case DRM_MODE_SCALE_ASPECT: 450 break; 451 default: 452 return -1; 453 } 454 455 if (drm_object_property_get_value(&connector->base, 456 property, 457 &curValue)) 458 return -1; 459 460 if (curValue == value) 461 return 0; 462 463 if (drm_object_property_set_value(&connector->base, 464 property, 465 value)) 466 return -1; 467 468 if (crtc->saved_mode.hdisplay != 0 && 469 crtc->saved_mode.vdisplay != 0) { 470 if (!drm_crtc_helper_set_mode(encoder->crtc, 471 &crtc->saved_mode, 472 encoder->crtc->x, 473 encoder->crtc->y, 474 encoder->crtc->primary->fb)) 475 return -1; 476 } 477 } else if (!strcmp(property->name, "backlight") && encoder) { 478 if (drm_object_property_set_value(&connector->base, 479 property, 480 value)) 481 return -1; 482 else 483 gma_backlight_set(encoder->dev, value); 484 } else if (!strcmp(property->name, "DPMS") && encoder) { 485 const struct drm_encoder_helper_funcs *helpers = 486 encoder->helper_private; 487 helpers->dpms(encoder, value); 488 } 489 return 0; 490 } 491 492 static const struct drm_encoder_helper_funcs 493 cdv_intel_lvds_helper_funcs = { 494 .dpms = cdv_intel_lvds_encoder_dpms, 495 .mode_fixup = cdv_intel_lvds_mode_fixup, 496 .prepare = cdv_intel_lvds_prepare, 497 .mode_set = cdv_intel_lvds_mode_set, 498 .commit = cdv_intel_lvds_commit, 499 }; 500 501 static const struct drm_connector_helper_funcs 502 cdv_intel_lvds_connector_helper_funcs = { 503 .get_modes = cdv_intel_lvds_get_modes, 504 .mode_valid = cdv_intel_lvds_mode_valid, 505 .best_encoder = gma_best_encoder, 506 }; 507 508 static const struct drm_connector_funcs cdv_intel_lvds_connector_funcs = { 509 .dpms = drm_helper_connector_dpms, 510 .fill_modes = drm_helper_probe_single_connector_modes, 511 .set_property = cdv_intel_lvds_set_property, 512 .destroy = cdv_intel_lvds_destroy, 513 }; 514 515 516 static void cdv_intel_lvds_enc_destroy(struct drm_encoder *encoder) 517 { 518 drm_encoder_cleanup(encoder); 519 } 520 521 static const struct drm_encoder_funcs cdv_intel_lvds_enc_funcs = { 522 .destroy = cdv_intel_lvds_enc_destroy, 523 }; 524 525 /* 526 * Enumerate the child dev array parsed from VBT to check whether 527 * the LVDS is present. 528 * If it is present, return 1. 529 * If it is not present, return false. 530 * If no child dev is parsed from VBT, it assumes that the LVDS is present. 531 */ 532 static bool lvds_is_present_in_vbt(struct drm_device *dev, 533 u8 *i2c_pin) 534 { 535 struct drm_psb_private *dev_priv = dev->dev_private; 536 int i; 537 538 if (!dev_priv->child_dev_num) 539 return true; 540 541 for (i = 0; i < dev_priv->child_dev_num; i++) { 542 struct child_device_config *child = dev_priv->child_dev + i; 543 544 /* If the device type is not LFP, continue. 545 * We have to check both the new identifiers as well as the 546 * old for compatibility with some BIOSes. 547 */ 548 if (child->device_type != DEVICE_TYPE_INT_LFP && 549 child->device_type != DEVICE_TYPE_LFP) 550 continue; 551 552 if (child->i2c_pin) 553 *i2c_pin = child->i2c_pin; 554 555 /* However, we cannot trust the BIOS writers to populate 556 * the VBT correctly. Since LVDS requires additional 557 * information from AIM blocks, a non-zero addin offset is 558 * a good indicator that the LVDS is actually present. 559 */ 560 if (child->addin_offset) 561 return true; 562 563 /* But even then some BIOS writers perform some black magic 564 * and instantiate the device without reference to any 565 * additional data. Trust that if the VBT was written into 566 * the OpRegion then they have validated the LVDS's existence. 567 */ 568 if (dev_priv->opregion.vbt) 569 return true; 570 } 571 572 return false; 573 } 574 575 /** 576 * cdv_intel_lvds_init - setup LVDS connectors on this device 577 * @dev: drm device 578 * 579 * Create the connector, register the LVDS DDC bus, and try to figure out what 580 * modes we can display on the LVDS panel (if present). 581 */ 582 void cdv_intel_lvds_init(struct drm_device *dev, 583 struct psb_intel_mode_device *mode_dev) 584 { 585 struct gma_encoder *gma_encoder; 586 struct gma_connector *gma_connector; 587 struct cdv_intel_lvds_priv *lvds_priv; 588 struct drm_connector *connector; 589 struct drm_encoder *encoder; 590 struct drm_display_mode *scan; 591 struct drm_crtc *crtc; 592 struct drm_psb_private *dev_priv = dev->dev_private; 593 u32 lvds; 594 int pipe; 595 u8 pin; 596 597 pin = GMBUS_PORT_PANEL; 598 if (!lvds_is_present_in_vbt(dev, &pin)) { 599 DRM_DEBUG_KMS("LVDS is not present in VBT\n"); 600 return; 601 } 602 603 gma_encoder = kzalloc(sizeof(struct gma_encoder), 604 GFP_KERNEL); 605 if (!gma_encoder) 606 return; 607 608 gma_connector = kzalloc(sizeof(struct gma_connector), 609 GFP_KERNEL); 610 if (!gma_connector) 611 goto failed_connector; 612 613 lvds_priv = kzalloc(sizeof(struct cdv_intel_lvds_priv), GFP_KERNEL); 614 if (!lvds_priv) 615 goto failed_lvds_priv; 616 617 gma_encoder->dev_priv = lvds_priv; 618 619 connector = &gma_connector->base; 620 gma_connector->save = cdv_intel_lvds_save; 621 gma_connector->restore = cdv_intel_lvds_restore; 622 encoder = &gma_encoder->base; 623 624 625 drm_connector_init(dev, connector, 626 &cdv_intel_lvds_connector_funcs, 627 DRM_MODE_CONNECTOR_LVDS); 628 629 drm_encoder_init(dev, encoder, 630 &cdv_intel_lvds_enc_funcs, 631 DRM_MODE_ENCODER_LVDS, NULL); 632 633 634 gma_connector_attach_encoder(gma_connector, gma_encoder); 635 gma_encoder->type = INTEL_OUTPUT_LVDS; 636 637 drm_encoder_helper_add(encoder, &cdv_intel_lvds_helper_funcs); 638 drm_connector_helper_add(connector, 639 &cdv_intel_lvds_connector_helper_funcs); 640 connector->display_info.subpixel_order = SubPixelHorizontalRGB; 641 connector->interlace_allowed = false; 642 connector->doublescan_allowed = false; 643 644 /*Attach connector properties*/ 645 drm_object_attach_property(&connector->base, 646 dev->mode_config.scaling_mode_property, 647 DRM_MODE_SCALE_FULLSCREEN); 648 drm_object_attach_property(&connector->base, 649 dev_priv->backlight_property, 650 BRIGHTNESS_MAX_LEVEL); 651 652 /** 653 * Set up I2C bus 654 * FIXME: distroy i2c_bus when exit 655 */ 656 gma_encoder->i2c_bus = psb_intel_i2c_create(dev, 657 GPIOB, 658 "LVDSBLC_B"); 659 if (!gma_encoder->i2c_bus) { 660 dev_printk(KERN_ERR, 661 &dev->pdev->dev, "I2C bus registration failed.\n"); 662 goto failed_blc_i2c; 663 } 664 gma_encoder->i2c_bus->slave_addr = 0x2C; 665 dev_priv->lvds_i2c_bus = gma_encoder->i2c_bus; 666 667 /* 668 * LVDS discovery: 669 * 1) check for EDID on DDC 670 * 2) check for VBT data 671 * 3) check to see if LVDS is already on 672 * if none of the above, no panel 673 * 4) make sure lid is open 674 * if closed, act like it's not there for now 675 */ 676 677 /* Set up the DDC bus. */ 678 gma_encoder->ddc_bus = psb_intel_i2c_create(dev, 679 GPIOC, 680 "LVDSDDC_C"); 681 if (!gma_encoder->ddc_bus) { 682 dev_printk(KERN_ERR, &dev->pdev->dev, 683 "DDC bus registration " "failed.\n"); 684 goto failed_ddc; 685 } 686 687 /* 688 * Attempt to get the fixed panel mode from DDC. Assume that the 689 * preferred mode is the right one. 690 */ 691 mutex_lock(&dev->mode_config.mutex); 692 psb_intel_ddc_get_modes(connector, 693 &gma_encoder->ddc_bus->adapter); 694 list_for_each_entry(scan, &connector->probed_modes, head) { 695 if (scan->type & DRM_MODE_TYPE_PREFERRED) { 696 mode_dev->panel_fixed_mode = 697 drm_mode_duplicate(dev, scan); 698 goto out; /* FIXME: check for quirks */ 699 } 700 } 701 702 /* Failed to get EDID, what about VBT? do we need this?*/ 703 if (dev_priv->lfp_lvds_vbt_mode) { 704 mode_dev->panel_fixed_mode = 705 drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode); 706 if (mode_dev->panel_fixed_mode) { 707 mode_dev->panel_fixed_mode->type |= 708 DRM_MODE_TYPE_PREFERRED; 709 goto out; /* FIXME: check for quirks */ 710 } 711 } 712 /* 713 * If we didn't get EDID, try checking if the panel is already turned 714 * on. If so, assume that whatever is currently programmed is the 715 * correct mode. 716 */ 717 lvds = REG_READ(LVDS); 718 pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0; 719 crtc = psb_intel_get_crtc_from_pipe(dev, pipe); 720 721 if (crtc && (lvds & LVDS_PORT_EN)) { 722 mode_dev->panel_fixed_mode = 723 cdv_intel_crtc_mode_get(dev, crtc); 724 if (mode_dev->panel_fixed_mode) { 725 mode_dev->panel_fixed_mode->type |= 726 DRM_MODE_TYPE_PREFERRED; 727 goto out; /* FIXME: check for quirks */ 728 } 729 } 730 731 /* If we still don't have a mode after all that, give up. */ 732 if (!mode_dev->panel_fixed_mode) { 733 DRM_DEBUG 734 ("Found no modes on the lvds, ignoring the LVDS\n"); 735 goto failed_find; 736 } 737 738 /* setup PWM */ 739 { 740 u32 pwm; 741 742 pwm = REG_READ(BLC_PWM_CTL2); 743 if (pipe == 1) 744 pwm |= PWM_PIPE_B; 745 else 746 pwm &= ~PWM_PIPE_B; 747 pwm |= PWM_ENABLE; 748 REG_WRITE(BLC_PWM_CTL2, pwm); 749 } 750 751 out: 752 mutex_unlock(&dev->mode_config.mutex); 753 drm_connector_register(connector); 754 return; 755 756 failed_find: 757 mutex_unlock(&dev->mode_config.mutex); 758 pr_err("Failed find\n"); 759 psb_intel_i2c_destroy(gma_encoder->ddc_bus); 760 failed_ddc: 761 pr_err("Failed DDC\n"); 762 psb_intel_i2c_destroy(gma_encoder->i2c_bus); 763 failed_blc_i2c: 764 pr_err("Failed BLC\n"); 765 drm_encoder_cleanup(encoder); 766 drm_connector_cleanup(connector); 767 kfree(lvds_priv); 768 failed_lvds_priv: 769 kfree(gma_connector); 770 failed_connector: 771 kfree(gma_encoder); 772 } 773