drivers/gpu/drm/i915/intel_lvds.c

   1 /*
   2  * Copyright © 2006-2007 Intel Corporation
   3  * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *      Eric Anholt <eric@anholt.net>
  26  *      Dave Airlie <airlied@linux.ie>
  27  *      Jesse Barnes <jesse.barnes@intel.com>
  28  */
  29
  30 #include <acpi/button.h>
  31 #include <linux/dmi.h>
  32 #include <linux/i2c.h>
  33 #include "drmP.h"
  34 #include "drm.h"
  35 #include "drm_crtc.h"
  36 #include "drm_edid.h"
  37 #include "intel_drv.h"
  38 #include "i915_drm.h"
  39 #include "i915_drv.h"
  40 #include <linux/acpi.h>
  41
  42 /* Private structure for the integrated LVDS support */
  43 struct intel_lvds_priv {
  44         int fitting_mode;
  45         u32 pfit_control;
  46         u32 pfit_pgm_ratios;
  47 };
  48
  49 /**
  50  * Sets the backlight level.
  51  *
  52  * \param level backlight level, from 0 to intel_lvds_get_max_backlight().
  53  */
  54 static void intel_lvds_set_backlight(struct drm_device *dev, int level)
  55 {
  56         struct drm_i915_private *dev_priv = dev->dev_private;
  57         u32 blc_pwm_ctl, reg;
  58
  59         if (HAS_PCH_SPLIT(dev))
  60                 reg = BLC_PWM_CPU_CTL;
  61         else
  62                 reg = BLC_PWM_CTL;
  63
  64         blc_pwm_ctl = I915_READ(reg) & ~BACKLIGHT_DUTY_CYCLE_MASK;
  65         I915_WRITE(reg, (blc_pwm_ctl |
  66                                  (level << BACKLIGHT_DUTY_CYCLE_SHIFT)));
  67 }
  68
  69 /**
  70  * Returns the maximum level of the backlight duty cycle field.
  71  */
  72 static u32 intel_lvds_get_max_backlight(struct drm_device *dev)
  73 {
  74         struct drm_i915_private *dev_priv = dev->dev_private;
  75         u32 reg;
  76
  77         if (HAS_PCH_SPLIT(dev))
  78                 reg = BLC_PWM_PCH_CTL2;
  79         else
  80                 reg = BLC_PWM_CTL;
  81
  82         return ((I915_READ(reg) & BACKLIGHT_MODULATION_FREQ_MASK) >>
  83                 BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
  84 }
  85
  86 /**
  87  * Sets the power state for the panel.
  88  */
  89 static void intel_lvds_set_power(struct drm_device *dev, bool on)
  90 {
  91         struct drm_i915_private *dev_priv = dev->dev_private;
  92         u32 pp_status, ctl_reg, status_reg, lvds_reg;
  93
  94         if (HAS_PCH_SPLIT(dev)) {
  95                 ctl_reg = PCH_PP_CONTROL;
  96                 status_reg = PCH_PP_STATUS;
  97                 lvds_reg = PCH_LVDS;
  98         } else {
  99                 ctl_reg = PP_CONTROL;
 100                 status_reg = PP_STATUS;
 101                 lvds_reg = LVDS;
 102         }
 103
 104         if (on) {
 105                 I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
 106                 POSTING_READ(lvds_reg);
 107
 108                 I915_WRITE(ctl_reg, I915_READ(ctl_reg) |
 109                            POWER_TARGET_ON);
 110                 do {
 111                         pp_status = I915_READ(status_reg);
 112                 } while ((pp_status & PP_ON) == 0);
 113
 114                 intel_lvds_set_backlight(dev, dev_priv->backlight_duty_cycle);
 115         } else {
 116                 intel_lvds_set_backlight(dev, 0);
 117
 118                 I915_WRITE(ctl_reg, I915_READ(ctl_reg) &
 119                            ~POWER_TARGET_ON);
 120                 do {
 121                         pp_status = I915_READ(status_reg);
 122                 } while (pp_status & PP_ON);
 123
 124                 I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
 125                 POSTING_READ(lvds_reg);
 126         }
 127 }
 128
 129 static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)
 130 {
 131         struct drm_device *dev = encoder->dev;
 132
 133         if (mode == DRM_MODE_DPMS_ON)
 134                 intel_lvds_set_power(dev, true);
 135         else
 136                 intel_lvds_set_power(dev, false);
 137
 138         /* XXX: We never power down the LVDS pairs. */
 139 }
 140
 141 static void intel_lvds_save(struct drm_connector *connector)
 142 {
 143         struct drm_device *dev = connector->dev;
 144         struct drm_i915_private *dev_priv = dev->dev_private;
 145         u32 pp_on_reg, pp_off_reg, pp_ctl_reg, pp_div_reg;
 146         u32 pwm_ctl_reg;
 147
 148         if (HAS_PCH_SPLIT(dev)) {
 149                 pp_on_reg = PCH_PP_ON_DELAYS;
 150                 pp_off_reg = PCH_PP_OFF_DELAYS;
 151                 pp_ctl_reg = PCH_PP_CONTROL;
 152                 pp_div_reg = PCH_PP_DIVISOR;
 153                 pwm_ctl_reg = BLC_PWM_CPU_CTL;
 154         } else {
 155                 pp_on_reg = PP_ON_DELAYS;
 156                 pp_off_reg = PP_OFF_DELAYS;
 157                 pp_ctl_reg = PP_CONTROL;
 158                 pp_div_reg = PP_DIVISOR;
 159                 pwm_ctl_reg = BLC_PWM_CTL;
 160         }
 161
 162         dev_priv->savePP_ON = I915_READ(pp_on_reg);
 163         dev_priv->savePP_OFF = I915_READ(pp_off_reg);
 164         dev_priv->savePP_CONTROL = I915_READ(pp_ctl_reg);
 165         dev_priv->savePP_DIVISOR = I915_READ(pp_div_reg);
 166         dev_priv->saveBLC_PWM_CTL = I915_READ(pwm_ctl_reg);
 167         dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
 168                                        BACKLIGHT_DUTY_CYCLE_MASK);
 169
 170         /*
 171          * If the light is off at server startup, just make it full brightness
 172          */
 173         if (dev_priv->backlight_duty_cycle == 0)
 174                 dev_priv->backlight_duty_cycle =
 175                         intel_lvds_get_max_backlight(dev);
 176 }
 177
 178 static void intel_lvds_restore(struct drm_connector *connector)
 179 {
 180         struct drm_device *dev = connector->dev;
 181         struct drm_i915_private *dev_priv = dev->dev_private;
 182         u32 pp_on_reg, pp_off_reg, pp_ctl_reg, pp_div_reg;
 183         u32 pwm_ctl_reg;
 184
 185         if (HAS_PCH_SPLIT(dev)) {
 186                 pp_on_reg = PCH_PP_ON_DELAYS;
 187                 pp_off_reg = PCH_PP_OFF_DELAYS;
 188                 pp_ctl_reg = PCH_PP_CONTROL;
 189                 pp_div_reg = PCH_PP_DIVISOR;
 190                 pwm_ctl_reg = BLC_PWM_CPU_CTL;
 191         } else {
 192                 pp_on_reg = PP_ON_DELAYS;
 193                 pp_off_reg = PP_OFF_DELAYS;
 194                 pp_ctl_reg = PP_CONTROL;
 195                 pp_div_reg = PP_DIVISOR;
 196                 pwm_ctl_reg = BLC_PWM_CTL;
 197         }
 198
 199         I915_WRITE(pwm_ctl_reg, dev_priv->saveBLC_PWM_CTL);
 200         I915_WRITE(pp_on_reg, dev_priv->savePP_ON);
 201         I915_WRITE(pp_off_reg, dev_priv->savePP_OFF);
 202         I915_WRITE(pp_div_reg, dev_priv->savePP_DIVISOR);
 203         I915_WRITE(pp_ctl_reg, dev_priv->savePP_CONTROL);
 204         if (dev_priv->savePP_CONTROL & POWER_TARGET_ON)
 205                 intel_lvds_set_power(dev, true);
 206         else
 207                 intel_lvds_set_power(dev, false);
 208 }
 209
 210 static int intel_lvds_mode_valid(struct drm_connector *connector,
 211                                  struct drm_display_mode *mode)
 212 {
 213         struct drm_device *dev = connector->dev;
 214         struct drm_i915_private *dev_priv = dev->dev_private;
 215         struct drm_display_mode *fixed_mode = dev_priv->panel_fixed_mode;
 216
 217         if (fixed_mode) {
 218                 if (mode->hdisplay > fixed_mode->hdisplay)
 219                         return MODE_PANEL;
 220                 if (mode->vdisplay > fixed_mode->vdisplay)
 221                         return MODE_PANEL;
 222         }
 223
 224         return MODE_OK;
 225 }
 226
 227 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
 228                                   struct drm_display_mode *mode,
 229                                   struct drm_display_mode *adjusted_mode)
 230 {
 231         /*
 232          * float point operation is not supported . So the PANEL_RATIO_FACTOR
 233          * is defined, which can avoid the float point computation when
 234          * calculating the panel ratio.
 235          */
 236 #define PANEL_RATIO_FACTOR 8192
 237         struct drm_device *dev = encoder->dev;
 238         struct drm_i915_private *dev_priv = dev->dev_private;
 239         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
 240         struct drm_encoder *tmp_encoder;
 241         struct intel_output *intel_output = enc_to_intel_output(encoder);
 242         struct intel_lvds_priv *lvds_priv = intel_output->dev_priv;
 243         u32 pfit_control = 0, pfit_pgm_ratios = 0;
 244         int left_border = 0, right_border = 0, top_border = 0;
 245         int bottom_border = 0;
 246         bool border = 0;
 247         int panel_ratio, desired_ratio, vert_scale, horiz_scale;
 248         int horiz_ratio, vert_ratio;
 249         u32 hsync_width, vsync_width;
 250         u32 hblank_width, vblank_width;
 251         u32 hsync_pos, vsync_pos;
 252
 253         /* Should never happen!! */
 254         if (!IS_I965G(dev) && intel_crtc->pipe == 0) {
 255                 DRM_ERROR("Can't support LVDS on pipe A\n");
 256                 return false;
 257         }
 258
 259         /* Should never happen!! */
 260         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, head) {
 261                 if (tmp_encoder != encoder && tmp_encoder->crtc == encoder->crtc) {
 262                         DRM_ERROR("Can't enable LVDS and another "
 263                                "encoder on the same pipe\n");
 264                         return false;
 265                 }
 266         }
 267         /* If we don't have a panel mode, there is nothing we can do */
 268         if (dev_priv->panel_fixed_mode == NULL)
 269                 return true;
 270         /*
 271          * If we have timings from the BIOS for the panel, put them in
 272          * to the adjusted mode.  The CRTC will be set up for this mode,
 273          * with the panel scaling set up to source from the H/VDisplay
 274          * of the original mode.
 275          */
 276         if (dev_priv->panel_fixed_mode != NULL) {
 277                 adjusted_mode->hdisplay = dev_priv->panel_fixed_mode->hdisplay;
 278                 adjusted_mode->hsync_start =
 279                         dev_priv->panel_fixed_mode->hsync_start;
 280                 adjusted_mode->hsync_end =
 281                         dev_priv->panel_fixed_mode->hsync_end;
 282                 adjusted_mode->htotal = dev_priv->panel_fixed_mode->htotal;
 283                 adjusted_mode->vdisplay = dev_priv->panel_fixed_mode->vdisplay;
 284                 adjusted_mode->vsync_start =
 285                         dev_priv->panel_fixed_mode->vsync_start;
 286                 adjusted_mode->vsync_end =
 287                         dev_priv->panel_fixed_mode->vsync_end;
 288                 adjusted_mode->vtotal = dev_priv->panel_fixed_mode->vtotal;
 289                 adjusted_mode->clock = dev_priv->panel_fixed_mode->clock;
 290                 drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);
 291         }
 292
 293         /* Make sure pre-965s set dither correctly */
 294         if (!IS_I965G(dev)) {
 295                 if (dev_priv->panel_wants_dither || dev_priv->lvds_dither)
 296                         pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 297         }
 298
 299         /* Native modes don't need fitting */
 300         if (adjusted_mode->hdisplay == mode->hdisplay &&
 301                         adjusted_mode->vdisplay == mode->vdisplay) {
 302                 pfit_pgm_ratios = 0;
 303                 border = 0;
 304                 goto out;
 305         }
 306
 307         /* full screen scale for now */
 308         if (HAS_PCH_SPLIT(dev))
 309                 goto out;
 310
 311         /* 965+ wants fuzzy fitting */
 312         if (IS_I965G(dev))
 313                 pfit_control |= (intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 314                                         PFIT_FILTER_FUZZY;
 315
 316         hsync_width = adjusted_mode->crtc_hsync_end -
 317                                         adjusted_mode->crtc_hsync_start;
 318         vsync_width = adjusted_mode->crtc_vsync_end -
 319                                         adjusted_mode->crtc_vsync_start;
 320         hblank_width = adjusted_mode->crtc_hblank_end -
 321                                         adjusted_mode->crtc_hblank_start;
 322         vblank_width = adjusted_mode->crtc_vblank_end -
 323                                         adjusted_mode->crtc_vblank_start;
 324         /*
 325          * Deal with panel fitting options. Figure out how to stretch the
 326          * image based on its aspect ratio & the current panel fitting mode.
 327          */
 328         panel_ratio = adjusted_mode->hdisplay * PANEL_RATIO_FACTOR /
 329                                 adjusted_mode->vdisplay;
 330         desired_ratio = mode->hdisplay * PANEL_RATIO_FACTOR /
 331                                 mode->vdisplay;
 332         /*
 333          * Enable automatic panel scaling for non-native modes so that they fill
 334          * the screen.  Should be enabled before the pipe is enabled, according
 335          * to register description and PRM.
 336          * Change the value here to see the borders for debugging
 337          */
 338         if (!HAS_PCH_SPLIT(dev)) {
 339                 I915_WRITE(BCLRPAT_A, 0);
 340                 I915_WRITE(BCLRPAT_B, 0);
 341         }
 342
 343         switch (lvds_priv->fitting_mode) {
 344         case DRM_MODE_SCALE_CENTER:
 345                 /*
 346                  * For centered modes, we have to calculate border widths &
 347                  * heights and modify the values programmed into the CRTC.
 348                  */
 349                 left_border = (adjusted_mode->hdisplay - mode->hdisplay) / 2;
 350                 right_border = left_border;
 351                 if (mode->hdisplay & 1)
 352                         right_border++;
 353                 top_border = (adjusted_mode->vdisplay - mode->vdisplay) / 2;
 354                 bottom_border = top_border;
 355                 if (mode->vdisplay & 1)
 356                         bottom_border++;
 357                 /* Set active & border values */
 358                 adjusted_mode->crtc_hdisplay = mode->hdisplay;
 359                 /* Keep the boder be even */
 360                 if (right_border & 1)
 361                         right_border++;
 362                 /* use the border directly instead of border minuse one */
 363                 adjusted_mode->crtc_hblank_start = mode->hdisplay +
 364                                                 right_border;
 365                 /* keep the blank width constant */
 366                 adjusted_mode->crtc_hblank_end =
 367                         adjusted_mode->crtc_hblank_start + hblank_width;
 368                 /* get the hsync pos relative to hblank start */
 369                 hsync_pos = (hblank_width - hsync_width) / 2;
 370                 /* keep the hsync pos be even */
 371                 if (hsync_pos & 1)
 372                         hsync_pos++;
 373                 adjusted_mode->crtc_hsync_start =
 374                                 adjusted_mode->crtc_hblank_start + hsync_pos;
 375                 /* keep the hsync width constant */
 376                 adjusted_mode->crtc_hsync_end =
 377                                 adjusted_mode->crtc_hsync_start + hsync_width;
 378                 adjusted_mode->crtc_vdisplay = mode->vdisplay;
 379                 /* use the border instead of border minus one */
 380                 adjusted_mode->crtc_vblank_start = mode->vdisplay +
 381                                                 bottom_border;
 382                 /* keep the vblank width constant */
 383                 adjusted_mode->crtc_vblank_end =
 384                                 adjusted_mode->crtc_vblank_start + vblank_width;
 385                 /* get the vsync start postion relative to vblank start */
 386                 vsync_pos = (vblank_width - vsync_width) / 2;
 387                 adjusted_mode->crtc_vsync_start =
 388                                 adjusted_mode->crtc_vblank_start + vsync_pos;
 389                 /* keep the vsync width constant */
 390                 adjusted_mode->crtc_vsync_end =
 391                                 adjusted_mode->crtc_vsync_start + vsync_width;
 392                 border = 1;
 393                 break;
 394         case DRM_MODE_SCALE_ASPECT:
 395                 /* Scale but preserve the spect ratio */
 396                 pfit_control |= PFIT_ENABLE;
 397                 if (IS_I965G(dev)) {
 398                         /* 965+ is easy, it does everything in hw */
 399                         if (panel_ratio > desired_ratio)
 400                                 pfit_control |= PFIT_SCALING_PILLAR;
 401                         else if (panel_ratio < desired_ratio)
 402                                 pfit_control |= PFIT_SCALING_LETTER;
 403                         else
 404                                 pfit_control |= PFIT_SCALING_AUTO;
 405                 } else {
 406                         /*
 407                          * For earlier chips we have to calculate the scaling
 408                          * ratio by hand and program it into the
 409                          * PFIT_PGM_RATIO register
 410                          */
 411                         u32 horiz_bits, vert_bits, bits = 12;
 412                         horiz_ratio = mode->hdisplay * PANEL_RATIO_FACTOR/
 413                                                 adjusted_mode->hdisplay;
 414                         vert_ratio = mode->vdisplay * PANEL_RATIO_FACTOR/
 415                                                 adjusted_mode->vdisplay;
 416                         horiz_scale = adjusted_mode->hdisplay *
 417                                         PANEL_RATIO_FACTOR / mode->hdisplay;
 418                         vert_scale = adjusted_mode->vdisplay *
 419                                         PANEL_RATIO_FACTOR / mode->vdisplay;
 420
 421                         /* retain aspect ratio */
 422                         if (panel_ratio > desired_ratio) { /* Pillar */
 423                                 u32 scaled_width;
 424                                 scaled_width = mode->hdisplay * vert_scale /
 425                                                 PANEL_RATIO_FACTOR;
 426                                 horiz_ratio = vert_ratio;
 427                                 pfit_control |= (VERT_AUTO_SCALE |
 428                                                  VERT_INTERP_BILINEAR |
 429                                                  HORIZ_INTERP_BILINEAR);
 430                                 /* Pillar will have left/right borders */
 431                                 left_border = (adjusted_mode->hdisplay -
 432                                                 scaled_width) / 2;
 433                                 right_border = left_border;
 434                                 if (mode->hdisplay & 1) /* odd resolutions */
 435                                         right_border++;
 436                                 /* keep the border be even */
 437                                 if (right_border & 1)
 438                                         right_border++;
 439                                 adjusted_mode->crtc_hdisplay = scaled_width;
 440                                 /* use border instead of border minus one */
 441                                 adjusted_mode->crtc_hblank_start =
 442                                         scaled_width + right_border;
 443                                 /* keep the hblank width constant */
 444                                 adjusted_mode->crtc_hblank_end =
 445                                         adjusted_mode->crtc_hblank_start +
 446                                                         hblank_width;
 447                                 /*
 448                                  * get the hsync start pos relative to
 449                                  * hblank start
 450                                  */
 451                                 hsync_pos = (hblank_width - hsync_width) / 2;
 452                                 /* keep the hsync_pos be even */
 453                                 if (hsync_pos & 1)
 454                                         hsync_pos++;
 455                                 adjusted_mode->crtc_hsync_start =
 456                                         adjusted_mode->crtc_hblank_start +
 457                                                         hsync_pos;
 458                                 /* keept hsync width constant */
 459                                 adjusted_mode->crtc_hsync_end =
 460                                         adjusted_mode->crtc_hsync_start +
 461                                                         hsync_width;
 462                                 border = 1;
 463                         } else if (panel_ratio < desired_ratio) { /* letter */
 464                                 u32 scaled_height = mode->vdisplay *
 465                                         horiz_scale / PANEL_RATIO_FACTOR;
 466                                 vert_ratio = horiz_ratio;
 467                                 pfit_control |= (HORIZ_AUTO_SCALE |
 468                                                  VERT_INTERP_BILINEAR |
 469                                                  HORIZ_INTERP_BILINEAR);
 470                                 /* Letterbox will have top/bottom border */
 471                                 top_border = (adjusted_mode->vdisplay -
 472                                         scaled_height) / 2;
 473                                 bottom_border = top_border;
 474                                 if (mode->vdisplay & 1)
 475                                         bottom_border++;
 476                                 adjusted_mode->crtc_vdisplay = scaled_height;
 477                                 /* use border instead of border minus one */
 478                                 adjusted_mode->crtc_vblank_start =
 479                                         scaled_height + bottom_border;
 480                                 /* keep the vblank width constant */
 481                                 adjusted_mode->crtc_vblank_end =
 482                                         adjusted_mode->crtc_vblank_start +
 483                                                         vblank_width;
 484                                 /*
 485                                  * get the vsync start pos relative to
 486                                  * vblank start
 487                                  */
 488                                 vsync_pos = (vblank_width - vsync_width) / 2;
 489                                 adjusted_mode->crtc_vsync_start =
 490                                         adjusted_mode->crtc_vblank_start +
 491                                                         vsync_pos;
 492                                 /* keep the vsync width constant */
 493                                 adjusted_mode->crtc_vsync_end =
 494                                         adjusted_mode->crtc_vsync_start +
 495                                                         vsync_width;
 496                                 border = 1;
 497                         } else {
 498                         /* Aspects match, Let hw scale both directions */
 499                                 pfit_control |= (VERT_AUTO_SCALE |
 500                                                  HORIZ_AUTO_SCALE |
 501                                                  VERT_INTERP_BILINEAR |
 502                                                  HORIZ_INTERP_BILINEAR);
 503                         }
 504                         horiz_bits = (1 << bits) * horiz_ratio /
 505                                         PANEL_RATIO_FACTOR;
 506                         vert_bits = (1 << bits) * vert_ratio /
 507                                         PANEL_RATIO_FACTOR;
 508                         pfit_pgm_ratios =
 509                                 ((vert_bits << PFIT_VERT_SCALE_SHIFT) &
 510                                                 PFIT_VERT_SCALE_MASK) |
 511                                 ((horiz_bits << PFIT_HORIZ_SCALE_SHIFT) &
 512                                                 PFIT_HORIZ_SCALE_MASK);
 513                 }
 514                 break;
 515
 516         case DRM_MODE_SCALE_FULLSCREEN:
 517                 /*
 518                  * Full scaling, even if it changes the aspect ratio.
 519                  * Fortunately this is all done for us in hw.
 520                  */
 521                 pfit_control |= PFIT_ENABLE;
 522                 if (IS_I965G(dev))
 523                         pfit_control |= PFIT_SCALING_AUTO;
 524                 else
 525                         pfit_control |= (VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 526                                          VERT_INTERP_BILINEAR |
 527                                          HORIZ_INTERP_BILINEAR);
 528                 break;
 529         default:
 530                 break;
 531         }
 532
 533 out:
 534         lvds_priv->pfit_control = pfit_control;
 535         lvds_priv->pfit_pgm_ratios = pfit_pgm_ratios;
 536         /*
 537          * When there exists the border, it means that the LVDS_BORDR
 538          * should be enabled.
 539          */
 540         if (border)
 541                 dev_priv->lvds_border_bits |= LVDS_BORDER_ENABLE;
 542         else
 543                 dev_priv->lvds_border_bits &= ~(LVDS_BORDER_ENABLE);
 544         /*
 545          * XXX: It would be nice to support lower refresh rates on the
 546          * panels to reduce power consumption, and perhaps match the
 547          * user's requested refresh rate.
 548          */
 549
 550         return true;
 551 }
 552
 553 static void intel_lvds_prepare(struct drm_encoder *encoder)
 554 {
 555         struct drm_device *dev = encoder->dev;
 556         struct drm_i915_private *dev_priv = dev->dev_private;
 557         u32 reg;
 558
 559         if (HAS_PCH_SPLIT(dev))
 560                 reg = BLC_PWM_CPU_CTL;
 561         else
 562                 reg = BLC_PWM_CTL;
 563
 564         dev_priv->saveBLC_PWM_CTL = I915_READ(reg);
 565         dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
 566                                        BACKLIGHT_DUTY_CYCLE_MASK);
 567
 568         intel_lvds_set_power(dev, false);
 569 }
 570
 571 static void intel_lvds_commit( struct drm_encoder *encoder)
 572 {
 573         struct drm_device *dev = encoder->dev;
 574         struct drm_i915_private *dev_priv = dev->dev_private;
 575
 576         if (dev_priv->backlight_duty_cycle == 0)
 577                 dev_priv->backlight_duty_cycle =
 578                         intel_lvds_get_max_backlight(dev);
 579
 580         intel_lvds_set_power(dev, true);
 581 }
 582
 583 static void intel_lvds_mode_set(struct drm_encoder *encoder,
 584                                 struct drm_display_mode *mode,
 585                                 struct drm_display_mode *adjusted_mode)
 586 {
 587         struct drm_device *dev = encoder->dev;
 588         struct drm_i915_private *dev_priv = dev->dev_private;
 589         struct intel_output *intel_output = enc_to_intel_output(encoder);
 590         struct intel_lvds_priv *lvds_priv = intel_output->dev_priv;
 591
 592         /*
 593          * The LVDS pin pair will already have been turned on in the
 594          * intel_crtc_mode_set since it has a large impact on the DPLL
 595          * settings.
 596          */
 597
 598         if (HAS_PCH_SPLIT(dev))
 599                 return;
 600
 601         /*
 602          * Enable automatic panel scaling so that non-native modes fill the
 603          * screen.  Should be enabled before the pipe is enabled, according to
 604          * register description and PRM.
 605          */
 606         I915_WRITE(PFIT_PGM_RATIOS, lvds_priv->pfit_pgm_ratios);
 607         I915_WRITE(PFIT_CONTROL, lvds_priv->pfit_control);
 608 }
 609
 610 /* Some lid devices report incorrect lid status, assume they're connected */
 611 static const struct dmi_system_id bad_lid_status[] = {
 612         {
 613                 .ident = "Compaq nx9020",
 614                 .matches = {
 615                         DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 616                         DMI_MATCH(DMI_BOARD_NAME, "3084"),
 617                 },
 618         },
 619         {
 620                 .ident = "Samsung SX20S",
 621                 .matches = {
 622                         DMI_MATCH(DMI_SYS_VENDOR, "Samsung Electronics"),
 623                         DMI_MATCH(DMI_BOARD_NAME, "SX20S"),
 624                 },
 625         },
 626         {
 627                 .ident = "Aspire One",
 628                 .matches = {
 629                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 630                         DMI_MATCH(DMI_PRODUCT_NAME, "Aspire one"),
 631                 },
 632         },
 633         {
 634                 .ident = "Aspire 1810T",
 635                 .matches = {
 636                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 637                         DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 1810T"),
 638                 },
 639         },
 640         {
 641                 .ident = "PC-81005",
 642                 .matches = {
 643                         DMI_MATCH(DMI_SYS_VENDOR, "MALATA"),
 644                         DMI_MATCH(DMI_PRODUCT_NAME, "PC-81005"),
 645                 },
 646         },
 647         {
 648                 .ident = "Clevo M5x0N",
 649                 .matches = {
 650                         DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."),
 651                         DMI_MATCH(DMI_BOARD_NAME, "M5x0N"),
 652                 },
 653         },
 654         { }
 655 };
 656
 657 /**
 658  * Detect the LVDS connection.
 659  *
 660  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
 661  * connected and closed means disconnected.  We also send hotplug events as
 662  * needed, using lid status notification from the input layer.
 663  */
 664 static enum drm_connector_status intel_lvds_detect(struct drm_connector *connector)
 665 {
 666         struct drm_device *dev = connector->dev;
 667         enum drm_connector_status status = connector_status_connected;
 668
 669         /* ACPI lid methods were generally unreliable in this generation, so
 670          * don't even bother.
 671          */
 672         if (IS_GEN2(dev))
 673                 return connector_status_connected;
 674
 675         if (!dmi_check_system(bad_lid_status) && !acpi_lid_open())
 676                 status = connector_status_disconnected;
 677
 678         return status;
 679 }
 680
 681 /**
 682  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 683  */
 684 static int intel_lvds_get_modes(struct drm_connector *connector)
 685 {
 686         struct drm_device *dev = connector->dev;
 687         struct intel_output *intel_output = to_intel_output(connector);
 688         struct drm_i915_private *dev_priv = dev->dev_private;
 689         int ret = 0;
 690
 691         ret = intel_ddc_get_modes(intel_output);
 692
 693         if (ret)
 694                 return ret;
 695
 696         /* Didn't get an EDID, so
 697          * Set wide sync ranges so we get all modes
 698          * handed to valid_mode for checking
 699          */
 700         connector->display_info.min_vfreq = 0;
 701         connector->display_info.max_vfreq = 200;
 702         connector->display_info.min_hfreq = 0;
 703         connector->display_info.max_hfreq = 200;
 704
 705         if (dev_priv->panel_fixed_mode != NULL) {
 706                 struct drm_display_mode *mode;
 707
 708                 mode = drm_mode_duplicate(dev, dev_priv->panel_fixed_mode);
 709                 drm_mode_probed_add(connector, mode);
 710
 711                 return 1;
 712         }
 713
 714         return 0;
 715 }
 716
 717 /*
 718  * Lid events. Note the use of 'modeset_on_lid':
 719  *  - we set it on lid close, and reset it on open
 720  *  - we use it as a "only once" bit (ie we ignore
 721  *    duplicate events where it was already properly
 722  *    set/reset)
 723  *  - the suspend/resume paths will also set it to
 724  *    zero, since they restore the mode ("lid open").
 725  */
 726 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 727                             void *unused)
 728 {
 729         struct drm_i915_private *dev_priv =
 730                 container_of(nb, struct drm_i915_private, lid_notifier);
 731         struct drm_device *dev = dev_priv->dev;
 732         struct drm_connector *connector = dev_priv->int_lvds_connector;
 733
 734         /*
 735          * check and update the status of LVDS connector after receiving
 736          * the LID nofication event.
 737          */
 738         if (connector)
 739                 connector->status = connector->funcs->detect(connector);
 740         if (!acpi_lid_open()) {
 741                 dev_priv->modeset_on_lid = 1;
 742                 return NOTIFY_OK;
 743         }
 744
 745         if (!dev_priv->modeset_on_lid)
 746                 return NOTIFY_OK;
 747
 748         dev_priv->modeset_on_lid = 0;
 749
 750         mutex_lock(&dev->mode_config.mutex);
 751         drm_helper_resume_force_mode(dev);
 752         mutex_unlock(&dev->mode_config.mutex);
 753
 754         return NOTIFY_OK;
 755 }
 756
 757 /**
 758  * intel_lvds_destroy - unregister and free LVDS structures
 759  * @connector: connector to free
 760  *
 761  * Unregister the DDC bus for this connector then free the driver private
 762  * structure.
 763  */
 764 static void intel_lvds_destroy(struct drm_connector *connector)
 765 {
 766         struct drm_device *dev = connector->dev;
 767         struct intel_output *intel_output = to_intel_output(connector);
 768         struct drm_i915_private *dev_priv = dev->dev_private;
 769
 770         if (intel_output->ddc_bus)
 771                 intel_i2c_destroy(intel_output->ddc_bus);
 772         if (dev_priv->lid_notifier.notifier_call)
 773                 acpi_lid_notifier_unregister(&dev_priv->lid_notifier);
 774         drm_sysfs_connector_remove(connector);
 775         drm_connector_cleanup(connector);
 776         kfree(connector);
 777 }
 778
 779 static int intel_lvds_set_property(struct drm_connector *connector,
 780                                    struct drm_property *property,
 781                                    uint64_t value)
 782 {
 783         struct drm_device *dev = connector->dev;
 784         struct intel_output *intel_output =
 785                         to_intel_output(connector);
 786
 787         if (property == dev->mode_config.scaling_mode_property &&
 788                                 connector->encoder) {
 789                 struct drm_crtc *crtc = connector->encoder->crtc;
 790                 struct intel_lvds_priv *lvds_priv = intel_output->dev_priv;
 791                 if (value == DRM_MODE_SCALE_NONE) {
 792                         DRM_DEBUG_KMS("no scaling not supported\n");
 793                         return 0;
 794                 }
 795                 if (lvds_priv->fitting_mode == value) {
 796                         /* the LVDS scaling property is not changed */
 797                         return 0;
 798                 }
 799                 lvds_priv->fitting_mode = value;
 800                 if (crtc && crtc->enabled) {
 801                         /*
 802                          * If the CRTC is enabled, the display will be changed
 803                          * according to the new panel fitting mode.
 804                          */
 805                         drm_crtc_helper_set_mode(crtc, &crtc->mode,
 806                                 crtc->x, crtc->y, crtc->fb);
 807                 }
 808         }
 809
 810         return 0;
 811 }
 812
 813 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
 814         .dpms = intel_lvds_dpms,
 815         .mode_fixup = intel_lvds_mode_fixup,
 816         .prepare = intel_lvds_prepare,
 817         .mode_set = intel_lvds_mode_set,
 818         .commit = intel_lvds_commit,
 819 };
 820
 821 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 822         .get_modes = intel_lvds_get_modes,
 823         .mode_valid = intel_lvds_mode_valid,
 824         .best_encoder = intel_best_encoder,
 825 };
 826
 827 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 828         .dpms = drm_helper_connector_dpms,
 829         .save = intel_lvds_save,
 830         .restore = intel_lvds_restore,
 831         .detect = intel_lvds_detect,
 832         .fill_modes = drm_helper_probe_single_connector_modes,
 833         .set_property = intel_lvds_set_property,
 834         .destroy = intel_lvds_destroy,
 835 };
 836
 837
 838 static void intel_lvds_enc_destroy(struct drm_encoder *encoder)
 839 {
 840         drm_encoder_cleanup(encoder);
 841 }
 842
 843 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 844         .destroy = intel_lvds_enc_destroy,
 845 };
 846
 847 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 848 {
 849         DRM_DEBUG_KMS("Skipping LVDS initialization for %s\n", id->ident);
 850         return 1;
 851 }
 852
 853 /* These systems claim to have LVDS, but really don't */
 854 static const struct dmi_system_id intel_no_lvds[] = {
 855         {
 856                 .callback = intel_no_lvds_dmi_callback,
 857                 .ident = "Apple Mac Mini (Core series)",
 858                 .matches = {
 859                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 860                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 861                 },
 862         },
 863         {
 864                 .callback = intel_no_lvds_dmi_callback,
 865                 .ident = "Apple Mac Mini (Core 2 series)",
 866                 .matches = {
 867                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 868                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 869                 },
 870         },
 871         {
 872                 .callback = intel_no_lvds_dmi_callback,
 873                 .ident = "MSI IM-945GSE-A",
 874                 .matches = {
 875                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 876                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 877                 },
 878         },
 879         {
 880                 .callback = intel_no_lvds_dmi_callback,
 881                 .ident = "Dell Studio Hybrid",
 882                 .matches = {
 883                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 884                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 885                 },
 886         },
 887         {
 888                 .callback = intel_no_lvds_dmi_callback,
 889                 .ident = "AOpen Mini PC",
 890                 .matches = {
 891                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 892                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 893                 },
 894         },
 895         {
 896                 .callback = intel_no_lvds_dmi_callback,
 897                 .ident = "AOpen Mini PC MP915",
 898                 .matches = {
 899                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 900                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 901                 },
 902         },
 903         {
 904                 .callback = intel_no_lvds_dmi_callback,
 905                 .ident = "Aopen i945GTt-VFA",
 906                 .matches = {
 907                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 908                 },
 909         },
 910
 911         { }     /* terminating entry */
 912 };
 913
 914 /**
 915  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
 916  * @dev: drm device
 917  * @connector: LVDS connector
 918  *
 919  * Find the reduced downclock for LVDS in EDID.
 920  */
 921 static void intel_find_lvds_downclock(struct drm_device *dev,
 922                                 struct drm_connector *connector)
 923 {
 924         struct drm_i915_private *dev_priv = dev->dev_private;
 925         struct drm_display_mode *scan, *panel_fixed_mode;
 926         int temp_downclock;
 927
 928         panel_fixed_mode = dev_priv->panel_fixed_mode;
 929         temp_downclock = panel_fixed_mode->clock;
 930
 931         mutex_lock(&dev->mode_config.mutex);
 932         list_for_each_entry(scan, &connector->probed_modes, head) {
 933                 /*
 934                  * If one mode has the same resolution with the fixed_panel
 935                  * mode while they have the different refresh rate, it means
 936                  * that the reduced downclock is found for the LVDS. In such
 937                  * case we can set the different FPx0/1 to dynamically select
 938                  * between low and high frequency.
 939                  */
 940                 if (scan->hdisplay == panel_fixed_mode->hdisplay &&
 941                         scan->hsync_start == panel_fixed_mode->hsync_start &&
 942                         scan->hsync_end == panel_fixed_mode->hsync_end &&
 943                         scan->htotal == panel_fixed_mode->htotal &&
 944                         scan->vdisplay == panel_fixed_mode->vdisplay &&
 945                         scan->vsync_start == panel_fixed_mode->vsync_start &&
 946                         scan->vsync_end == panel_fixed_mode->vsync_end &&
 947                         scan->vtotal == panel_fixed_mode->vtotal) {
 948                         if (scan->clock < temp_downclock) {
 949                                 /*
 950                                  * The downclock is already found. But we
 951                                  * expect to find the lower downclock.
 952                                  */
 953                                 temp_downclock = scan->clock;
 954                         }
 955                 }
 956         }
 957         mutex_unlock(&dev->mode_config.mutex);
 958         if (temp_downclock < panel_fixed_mode->clock &&
 959             i915_lvds_downclock) {
 960                 /* We found the downclock for LVDS. */
 961                 dev_priv->lvds_downclock_avail = 1;
 962                 dev_priv->lvds_downclock = temp_downclock;
 963                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
 964                                 "Normal clock %dKhz, downclock %dKhz\n",
 965                                 panel_fixed_mode->clock, temp_downclock);
 966         }
 967         return;
 968 }
 969
 970 /*
 971  * Enumerate the child dev array parsed from VBT to check whether
 972  * the LVDS is present.
 973  * If it is present, return 1.
 974  * If it is not present, return false.
 975  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
 976  * Note: The addin_offset should also be checked for LVDS panel.
 977  * Only when it is non-zero, it is assumed that it is present.
 978  */
 979 static int lvds_is_present_in_vbt(struct drm_device *dev)
 980 {
 981         struct drm_i915_private *dev_priv = dev->dev_private;
 982         struct child_device_config *p_child;
 983         int i, ret;
 984
 985         if (!dev_priv->child_dev_num)
 986                 return 1;
 987
 988         ret = 0;
 989         for (i = 0; i < dev_priv->child_dev_num; i++) {
 990                 p_child = dev_priv->child_dev + i;
 991                 /*
 992                  * If the device type is not LFP, continue.
 993                  * If the device type is 0x22, it is also regarded as LFP.
 994                  */
 995                 if (p_child->device_type != DEVICE_TYPE_INT_LFP &&
 996                         p_child->device_type != DEVICE_TYPE_LFP)
 997                         continue;
 998
 999                 /* The addin_offset should be checked. Only when it is
1000                  * non-zero, it is regarded as present.
1001                  */
1002                 if (p_child->addin_offset) {
1003                         ret = 1;
1004                         break;
1005                 }
1006         }
1007         return ret;
1008 }
1009
1010 /**
1011  * intel_lvds_init - setup LVDS connectors on this device
1012  * @dev: drm device
1013  *
1014  * Create the connector, register the LVDS DDC bus, and try to figure out what
1015  * modes we can display on the LVDS panel (if present).
1016  */
1017 void intel_lvds_init(struct drm_device *dev)
1018 {
1019         struct drm_i915_private *dev_priv = dev->dev_private;
1020         struct intel_output *intel_output;
1021         struct drm_connector *connector;
1022         struct drm_encoder *encoder;
1023         struct drm_display_mode *scan; /* *modes, *bios_mode; */
1024         struct drm_crtc *crtc;
1025         struct intel_lvds_priv *lvds_priv;
1026         u32 lvds;
1027         int pipe, gpio = GPIOC;
1028
1029         /* Skip init on machines we know falsely report LVDS */
1030         if (dmi_check_system(intel_no_lvds))
1031                 return;
1032
1033         if (!lvds_is_present_in_vbt(dev)) {
1034                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
1035                 return;
1036         }
1037
1038         if (HAS_PCH_SPLIT(dev)) {
1039                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
1040                         return;
1041                 if (dev_priv->edp_support) {
1042                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
1043                         return;
1044                 }
1045                 gpio = PCH_GPIOC;
1046         }
1047
1048         intel_output = kzalloc(sizeof(struct intel_output) +
1049                                 sizeof(struct intel_lvds_priv), GFP_KERNEL);
1050         if (!intel_output) {
1051                 return;
1052         }
1053
1054         connector = &intel_output->base;
1055         encoder = &intel_output->enc;
1056         drm_connector_init(dev, &intel_output->base, &intel_lvds_connector_funcs,
1057                            DRM_MODE_CONNECTOR_LVDS);
1058
1059         drm_encoder_init(dev, &intel_output->enc, &intel_lvds_enc_funcs,
1060                          DRM_MODE_ENCODER_LVDS);
1061
1062         drm_mode_connector_attach_encoder(&intel_output->base, &intel_output->enc);
1063         intel_output->type = INTEL_OUTPUT_LVDS;
1064
1065         intel_output->clone_mask = (1 << INTEL_LVDS_CLONE_BIT);
1066         intel_output->crtc_mask = (1 << 1);
1067         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
1068         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
1069         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
1070         connector->interlace_allowed = false;
1071         connector->doublescan_allowed = false;
1072
1073         lvds_priv = (struct intel_lvds_priv *)(intel_output + 1);
1074         intel_output->dev_priv = lvds_priv;
1075         /* create the scaling mode property */
1076         drm_mode_create_scaling_mode_property(dev);
1077         /*
1078          * the initial panel fitting mode will be FULL_SCREEN.
1079          */
1080
1081         drm_connector_attach_property(&intel_output->base,
1082                                       dev->mode_config.scaling_mode_property,
1083                                       DRM_MODE_SCALE_FULLSCREEN);
1084         lvds_priv->fitting_mode = DRM_MODE_SCALE_FULLSCREEN;
1085         /*
1086          * LVDS discovery:
1087          * 1) check for EDID on DDC
1088          * 2) check for VBT data
1089          * 3) check to see if LVDS is already on
1090          *    if none of the above, no panel
1091          * 4) make sure lid is open
1092          *    if closed, act like it's not there for now
1093          */
1094
1095         /* Set up the DDC bus. */
1096         intel_output->ddc_bus = intel_i2c_create(dev, gpio, "LVDSDDC_C");
1097         if (!intel_output->ddc_bus) {
1098                 dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
1099                            "failed.\n");
1100                 goto failed;
1101         }
1102
1103         /*
1104          * Attempt to get the fixed panel mode from DDC.  Assume that the
1105          * preferred mode is the right one.
1106          */
1107         intel_ddc_get_modes(intel_output);
1108
1109         list_for_each_entry(scan, &connector->probed_modes, head) {
1110                 mutex_lock(&dev->mode_config.mutex);
1111                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
1112                         dev_priv->panel_fixed_mode =
1113                                 drm_mode_duplicate(dev, scan);
1114                         mutex_unlock(&dev->mode_config.mutex);
1115                         intel_find_lvds_downclock(dev, connector);
1116                         goto out;
1117                 }
1118                 mutex_unlock(&dev->mode_config.mutex);
1119         }
1120
1121         /* Failed to get EDID, what about VBT? */
1122         if (dev_priv->lfp_lvds_vbt_mode) {
1123                 mutex_lock(&dev->mode_config.mutex);
1124                 dev_priv->panel_fixed_mode =
1125                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
1126                 mutex_unlock(&dev->mode_config.mutex);
1127                 if (dev_priv->panel_fixed_mode) {
1128                         dev_priv->panel_fixed_mode->type |=
1129                                 DRM_MODE_TYPE_PREFERRED;
1130                         goto out;
1131                 }
1132         }
1133
1134         /*
1135          * If we didn't get EDID, try checking if the panel is already turned
1136          * on.  If so, assume that whatever is currently programmed is the
1137          * correct mode.
1138          */
1139
1140         /* Ironlake: FIXME if still fail, not try pipe mode now */
1141         if (HAS_PCH_SPLIT(dev))
1142                 goto failed;
1143
1144         lvds = I915_READ(LVDS);
1145         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1146         crtc = intel_get_crtc_from_pipe(dev, pipe);
1147
1148         if (crtc && (lvds & LVDS_PORT_EN)) {
1149                 dev_priv->panel_fixed_mode = intel_crtc_mode_get(dev, crtc);
1150                 if (dev_priv->panel_fixed_mode) {
1151                         dev_priv->panel_fixed_mode->type |=
1152                                 DRM_MODE_TYPE_PREFERRED;
1153                         goto out;
1154                 }
1155         }
1156
1157         /* If we still don't have a mode after all that, give up. */
1158         if (!dev_priv->panel_fixed_mode)
1159                 goto failed;
1160
1161 out:
1162         if (HAS_PCH_SPLIT(dev)) {
1163                 u32 pwm;
1164                 /* make sure PWM is enabled */
1165                 pwm = I915_READ(BLC_PWM_CPU_CTL2);
1166                 pwm |= (PWM_ENABLE | PWM_PIPE_B);
1167                 I915_WRITE(BLC_PWM_CPU_CTL2, pwm);
1168
1169                 pwm = I915_READ(BLC_PWM_PCH_CTL1);
1170                 pwm |= PWM_PCH_ENABLE;
1171                 I915_WRITE(BLC_PWM_PCH_CTL1, pwm);
1172         }
1173         dev_priv->lid_notifier.notifier_call = intel_lid_notify;
1174         if (acpi_lid_notifier_register(&dev_priv->lid_notifier)) {
1175                 DRM_DEBUG_KMS("lid notifier registration failed\n");
1176                 dev_priv->lid_notifier.notifier_call = NULL;
1177         }
1178         /* keep the LVDS connector */
1179         dev_priv->int_lvds_connector = connector;
1180         drm_sysfs_connector_add(connector);
1181         return;
1182
1183 failed:
1184         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1185         if (intel_output->ddc_bus)
1186                 intel_i2c_destroy(intel_output->ddc_bus);
1187         drm_connector_cleanup(connector);
1188         drm_encoder_cleanup(encoder);
1189         kfree(intel_output);
1190 }