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 (IS_IGDNG(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 (IS_IGDNG(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;
  93
  94         if (IS_IGDNG(dev)) {
  95                 ctl_reg = PCH_PP_CONTROL;
  96                 status_reg = PCH_PP_STATUS;
  97         } else {
  98                 ctl_reg = PP_CONTROL;
  99                 status_reg = PP_STATUS;
 100         }
 101
 102         if (on) {
 103                 I915_WRITE(ctl_reg, I915_READ(ctl_reg) |
 104                            POWER_TARGET_ON);
 105                 do {
 106                         pp_status = I915_READ(status_reg);
 107                 } while ((pp_status & PP_ON) == 0);
 108
 109                 intel_lvds_set_backlight(dev, dev_priv->backlight_duty_cycle);
 110         } else {
 111                 intel_lvds_set_backlight(dev, 0);
 112
 113                 I915_WRITE(ctl_reg, I915_READ(ctl_reg) &
 114                            ~POWER_TARGET_ON);
 115                 do {
 116                         pp_status = I915_READ(status_reg);
 117                 } while (pp_status & PP_ON);
 118         }
 119 }
 120
 121 static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)
 122 {
 123         struct drm_device *dev = encoder->dev;
 124
 125         if (mode == DRM_MODE_DPMS_ON)
 126                 intel_lvds_set_power(dev, true);
 127         else
 128                 intel_lvds_set_power(dev, false);
 129
 130         /* XXX: We never power down the LVDS pairs. */
 131 }
 132
 133 static void intel_lvds_save(struct drm_connector *connector)
 134 {
 135         struct drm_device *dev = connector->dev;
 136         struct drm_i915_private *dev_priv = dev->dev_private;
 137         u32 pp_on_reg, pp_off_reg, pp_ctl_reg, pp_div_reg;
 138         u32 pwm_ctl_reg;
 139
 140         if (IS_IGDNG(dev)) {
 141                 pp_on_reg = PCH_PP_ON_DELAYS;
 142                 pp_off_reg = PCH_PP_OFF_DELAYS;
 143                 pp_ctl_reg = PCH_PP_CONTROL;
 144                 pp_div_reg = PCH_PP_DIVISOR;
 145                 pwm_ctl_reg = BLC_PWM_CPU_CTL;
 146         } else {
 147                 pp_on_reg = PP_ON_DELAYS;
 148                 pp_off_reg = PP_OFF_DELAYS;
 149                 pp_ctl_reg = PP_CONTROL;
 150                 pp_div_reg = PP_DIVISOR;
 151                 pwm_ctl_reg = BLC_PWM_CTL;
 152         }
 153
 154         dev_priv->savePP_ON = I915_READ(pp_on_reg);
 155         dev_priv->savePP_OFF = I915_READ(pp_off_reg);
 156         dev_priv->savePP_CONTROL = I915_READ(pp_ctl_reg);
 157         dev_priv->savePP_DIVISOR = I915_READ(pp_div_reg);
 158         dev_priv->saveBLC_PWM_CTL = I915_READ(pwm_ctl_reg);
 159         dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
 160                                        BACKLIGHT_DUTY_CYCLE_MASK);
 161
 162         /*
 163          * If the light is off at server startup, just make it full brightness
 164          */
 165         if (dev_priv->backlight_duty_cycle == 0)
 166                 dev_priv->backlight_duty_cycle =
 167                         intel_lvds_get_max_backlight(dev);
 168 }
 169
 170 static void intel_lvds_restore(struct drm_connector *connector)
 171 {
 172         struct drm_device *dev = connector->dev;
 173         struct drm_i915_private *dev_priv = dev->dev_private;
 174         u32 pp_on_reg, pp_off_reg, pp_ctl_reg, pp_div_reg;
 175         u32 pwm_ctl_reg;
 176
 177         if (IS_IGDNG(dev)) {
 178                 pp_on_reg = PCH_PP_ON_DELAYS;
 179                 pp_off_reg = PCH_PP_OFF_DELAYS;
 180                 pp_ctl_reg = PCH_PP_CONTROL;
 181                 pp_div_reg = PCH_PP_DIVISOR;
 182                 pwm_ctl_reg = BLC_PWM_CPU_CTL;
 183         } else {
 184                 pp_on_reg = PP_ON_DELAYS;
 185                 pp_off_reg = PP_OFF_DELAYS;
 186                 pp_ctl_reg = PP_CONTROL;
 187                 pp_div_reg = PP_DIVISOR;
 188                 pwm_ctl_reg = BLC_PWM_CTL;
 189         }
 190
 191         I915_WRITE(pwm_ctl_reg, dev_priv->saveBLC_PWM_CTL);
 192         I915_WRITE(pp_on_reg, dev_priv->savePP_ON);
 193         I915_WRITE(pp_off_reg, dev_priv->savePP_OFF);
 194         I915_WRITE(pp_div_reg, dev_priv->savePP_DIVISOR);
 195         I915_WRITE(pp_ctl_reg, dev_priv->savePP_CONTROL);
 196         if (dev_priv->savePP_CONTROL & POWER_TARGET_ON)
 197                 intel_lvds_set_power(dev, true);
 198         else
 199                 intel_lvds_set_power(dev, false);
 200 }
 201
 202 static int intel_lvds_mode_valid(struct drm_connector *connector,
 203                                  struct drm_display_mode *mode)
 204 {
 205         struct drm_device *dev = connector->dev;
 206         struct drm_i915_private *dev_priv = dev->dev_private;
 207         struct drm_display_mode *fixed_mode = dev_priv->panel_fixed_mode;
 208
 209         if (fixed_mode) {
 210                 if (mode->hdisplay > fixed_mode->hdisplay)
 211                         return MODE_PANEL;
 212                 if (mode->vdisplay > fixed_mode->vdisplay)
 213                         return MODE_PANEL;
 214         }
 215
 216         return MODE_OK;
 217 }
 218
 219 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
 220                                   struct drm_display_mode *mode,
 221                                   struct drm_display_mode *adjusted_mode)
 222 {
 223         /*
 224          * float point operation is not supported . So the PANEL_RATIO_FACTOR
 225          * is defined, which can avoid the float point computation when
 226          * calculating the panel ratio.
 227          */
 228 #define PANEL_RATIO_FACTOR 8192
 229         struct drm_device *dev = encoder->dev;
 230         struct drm_i915_private *dev_priv = dev->dev_private;
 231         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
 232         struct drm_encoder *tmp_encoder;
 233         struct intel_output *intel_output = enc_to_intel_output(encoder);
 234         struct intel_lvds_priv *lvds_priv = intel_output->dev_priv;
 235         u32 pfit_control = 0, pfit_pgm_ratios = 0;
 236         int left_border = 0, right_border = 0, top_border = 0;
 237         int bottom_border = 0;
 238         bool border = 0;
 239         int panel_ratio, desired_ratio, vert_scale, horiz_scale;
 240         int horiz_ratio, vert_ratio;
 241         u32 hsync_width, vsync_width;
 242         u32 hblank_width, vblank_width;
 243         u32 hsync_pos, vsync_pos;
 244
 245         /* Should never happen!! */
 246         if (!IS_I965G(dev) && intel_crtc->pipe == 0) {
 247                 DRM_ERROR("Can't support LVDS on pipe A\n");
 248                 return false;
 249         }
 250
 251         /* Should never happen!! */
 252         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, head) {
 253                 if (tmp_encoder != encoder && tmp_encoder->crtc == encoder->crtc) {
 254                         DRM_ERROR("Can't enable LVDS and another "
 255                                "encoder on the same pipe\n");
 256                         return false;
 257                 }
 258         }
 259         /* If we don't have a panel mode, there is nothing we can do */
 260         if (dev_priv->panel_fixed_mode == NULL)
 261                 return true;
 262         /*
 263          * If we have timings from the BIOS for the panel, put them in
 264          * to the adjusted mode.  The CRTC will be set up for this mode,
 265          * with the panel scaling set up to source from the H/VDisplay
 266          * of the original mode.
 267          */
 268         if (dev_priv->panel_fixed_mode != NULL) {
 269                 adjusted_mode->hdisplay = dev_priv->panel_fixed_mode->hdisplay;
 270                 adjusted_mode->hsync_start =
 271                         dev_priv->panel_fixed_mode->hsync_start;
 272                 adjusted_mode->hsync_end =
 273                         dev_priv->panel_fixed_mode->hsync_end;
 274                 adjusted_mode->htotal = dev_priv->panel_fixed_mode->htotal;
 275                 adjusted_mode->vdisplay = dev_priv->panel_fixed_mode->vdisplay;
 276                 adjusted_mode->vsync_start =
 277                         dev_priv->panel_fixed_mode->vsync_start;
 278                 adjusted_mode->vsync_end =
 279                         dev_priv->panel_fixed_mode->vsync_end;
 280                 adjusted_mode->vtotal = dev_priv->panel_fixed_mode->vtotal;
 281                 adjusted_mode->clock = dev_priv->panel_fixed_mode->clock;
 282                 drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);
 283         }
 284
 285         /* Make sure pre-965s set dither correctly */
 286         if (!IS_I965G(dev)) {
 287                 if (dev_priv->panel_wants_dither || dev_priv->lvds_dither)
 288                         pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 289         }
 290
 291         /* Native modes don't need fitting */
 292         if (adjusted_mode->hdisplay == mode->hdisplay &&
 293                         adjusted_mode->vdisplay == mode->vdisplay) {
 294                 pfit_pgm_ratios = 0;
 295                 border = 0;
 296                 goto out;
 297         }
 298
 299         /* 965+ wants fuzzy fitting */
 300         if (IS_I965G(dev))
 301                 pfit_control |= (intel_crtc->pipe << PFIT_PIPE_SHIFT) |
 302                                         PFIT_FILTER_FUZZY;
 303
 304         hsync_width = adjusted_mode->crtc_hsync_end -
 305                                         adjusted_mode->crtc_hsync_start;
 306         vsync_width = adjusted_mode->crtc_vsync_end -
 307                                         adjusted_mode->crtc_vsync_start;
 308         hblank_width = adjusted_mode->crtc_hblank_end -
 309                                         adjusted_mode->crtc_hblank_start;
 310         vblank_width = adjusted_mode->crtc_vblank_end -
 311                                         adjusted_mode->crtc_vblank_start;
 312         /*
 313          * Deal with panel fitting options. Figure out how to stretch the
 314          * image based on its aspect ratio & the current panel fitting mode.
 315          */
 316         panel_ratio = adjusted_mode->hdisplay * PANEL_RATIO_FACTOR /
 317                                 adjusted_mode->vdisplay;
 318         desired_ratio = mode->hdisplay * PANEL_RATIO_FACTOR /
 319                                 mode->vdisplay;
 320         /*
 321          * Enable automatic panel scaling for non-native modes so that they fill
 322          * the screen.  Should be enabled before the pipe is enabled, according
 323          * to register description and PRM.
 324          * Change the value here to see the borders for debugging
 325          */
 326         I915_WRITE(BCLRPAT_A, 0);
 327         I915_WRITE(BCLRPAT_B, 0);
 328
 329         switch (lvds_priv->fitting_mode) {
 330         case DRM_MODE_SCALE_CENTER:
 331                 /*
 332                  * For centered modes, we have to calculate border widths &
 333                  * heights and modify the values programmed into the CRTC.
 334                  */
 335                 left_border = (adjusted_mode->hdisplay - mode->hdisplay) / 2;
 336                 right_border = left_border;
 337                 if (mode->hdisplay & 1)
 338                         right_border++;
 339                 top_border = (adjusted_mode->vdisplay - mode->vdisplay) / 2;
 340                 bottom_border = top_border;
 341                 if (mode->vdisplay & 1)
 342                         bottom_border++;
 343                 /* Set active & border values */
 344                 adjusted_mode->crtc_hdisplay = mode->hdisplay;
 345                 /* Keep the boder be even */
 346                 if (right_border & 1)
 347                         right_border++;
 348                 /* use the border directly instead of border minuse one */
 349                 adjusted_mode->crtc_hblank_start = mode->hdisplay +
 350                                                 right_border;
 351                 /* keep the blank width constant */
 352                 adjusted_mode->crtc_hblank_end =
 353                         adjusted_mode->crtc_hblank_start + hblank_width;
 354                 /* get the hsync pos relative to hblank start */
 355                 hsync_pos = (hblank_width - hsync_width) / 2;
 356                 /* keep the hsync pos be even */
 357                 if (hsync_pos & 1)
 358                         hsync_pos++;
 359                 adjusted_mode->crtc_hsync_start =
 360                                 adjusted_mode->crtc_hblank_start + hsync_pos;
 361                 /* keep the hsync width constant */
 362                 adjusted_mode->crtc_hsync_end =
 363                                 adjusted_mode->crtc_hsync_start + hsync_width;
 364                 adjusted_mode->crtc_vdisplay = mode->vdisplay;
 365                 /* use the border instead of border minus one */
 366                 adjusted_mode->crtc_vblank_start = mode->vdisplay +
 367                                                 bottom_border;
 368                 /* keep the vblank width constant */
 369                 adjusted_mode->crtc_vblank_end =
 370                                 adjusted_mode->crtc_vblank_start + vblank_width;
 371                 /* get the vsync start postion relative to vblank start */
 372                 vsync_pos = (vblank_width - vsync_width) / 2;
 373                 adjusted_mode->crtc_vsync_start =
 374                                 adjusted_mode->crtc_vblank_start + vsync_pos;
 375                 /* keep the vsync width constant */
 376                 adjusted_mode->crtc_vsync_end =
 377                                 adjusted_mode->crtc_vblank_start + vsync_width;
 378                 border = 1;
 379                 break;
 380         case DRM_MODE_SCALE_ASPECT:
 381                 /* Scale but preserve the spect ratio */
 382                 pfit_control |= PFIT_ENABLE;
 383                 if (IS_I965G(dev)) {
 384                         /* 965+ is easy, it does everything in hw */
 385                         if (panel_ratio > desired_ratio)
 386                                 pfit_control |= PFIT_SCALING_PILLAR;
 387                         else if (panel_ratio < desired_ratio)
 388                                 pfit_control |= PFIT_SCALING_LETTER;
 389                         else
 390                                 pfit_control |= PFIT_SCALING_AUTO;
 391                 } else {
 392                         /*
 393                          * For earlier chips we have to calculate the scaling
 394                          * ratio by hand and program it into the
 395                          * PFIT_PGM_RATIO register
 396                          */
 397                         u32 horiz_bits, vert_bits, bits = 12;
 398                         horiz_ratio = mode->hdisplay * PANEL_RATIO_FACTOR/
 399                                                 adjusted_mode->hdisplay;
 400                         vert_ratio = mode->vdisplay * PANEL_RATIO_FACTOR/
 401                                                 adjusted_mode->vdisplay;
 402                         horiz_scale = adjusted_mode->hdisplay *
 403                                         PANEL_RATIO_FACTOR / mode->hdisplay;
 404                         vert_scale = adjusted_mode->vdisplay *
 405                                         PANEL_RATIO_FACTOR / mode->vdisplay;
 406
 407                         /* retain aspect ratio */
 408                         if (panel_ratio > desired_ratio) { /* Pillar */
 409                                 u32 scaled_width;
 410                                 scaled_width = mode->hdisplay * vert_scale /
 411                                                 PANEL_RATIO_FACTOR;
 412                                 horiz_ratio = vert_ratio;
 413                                 pfit_control |= (VERT_AUTO_SCALE |
 414                                                  VERT_INTERP_BILINEAR |
 415                                                  HORIZ_INTERP_BILINEAR);
 416                                 /* Pillar will have left/right borders */
 417                                 left_border = (adjusted_mode->hdisplay -
 418                                                 scaled_width) / 2;
 419                                 right_border = left_border;
 420                                 if (mode->hdisplay & 1) /* odd resolutions */
 421                                         right_border++;
 422                                 /* keep the border be even */
 423                                 if (right_border & 1)
 424                                         right_border++;
 425                                 adjusted_mode->crtc_hdisplay = scaled_width;
 426                                 /* use border instead of border minus one */
 427                                 adjusted_mode->crtc_hblank_start =
 428                                         scaled_width + right_border;
 429                                 /* keep the hblank width constant */
 430                                 adjusted_mode->crtc_hblank_end =
 431                                         adjusted_mode->crtc_hblank_start +
 432                                                         hblank_width;
 433                                 /*
 434                                  * get the hsync start pos relative to
 435                                  * hblank start
 436                                  */
 437                                 hsync_pos = (hblank_width - hsync_width) / 2;
 438                                 /* keep the hsync_pos be even */
 439                                 if (hsync_pos & 1)
 440                                         hsync_pos++;
 441                                 adjusted_mode->crtc_hsync_start =
 442                                         adjusted_mode->crtc_hblank_start +
 443                                                         hsync_pos;
 444                                 /* keept hsync width constant */
 445                                 adjusted_mode->crtc_hsync_end =
 446                                         adjusted_mode->crtc_hsync_start +
 447                                                         hsync_width;
 448                                 border = 1;
 449                         } else if (panel_ratio < desired_ratio) { /* letter */
 450                                 u32 scaled_height = mode->vdisplay *
 451                                         horiz_scale / PANEL_RATIO_FACTOR;
 452                                 vert_ratio = horiz_ratio;
 453                                 pfit_control |= (HORIZ_AUTO_SCALE |
 454                                                  VERT_INTERP_BILINEAR |
 455                                                  HORIZ_INTERP_BILINEAR);
 456                                 /* Letterbox will have top/bottom border */
 457                                 top_border = (adjusted_mode->vdisplay -
 458                                         scaled_height) / 2;
 459                                 bottom_border = top_border;
 460                                 if (mode->vdisplay & 1)
 461                                         bottom_border++;
 462                                 adjusted_mode->crtc_vdisplay = scaled_height;
 463                                 /* use border instead of border minus one */
 464                                 adjusted_mode->crtc_vblank_start =
 465                                         scaled_height + bottom_border;
 466                                 /* keep the vblank width constant */
 467                                 adjusted_mode->crtc_vblank_end =
 468                                         adjusted_mode->crtc_vblank_start +
 469                                                         vblank_width;
 470                                 /*
 471                                  * get the vsync start pos relative to
 472                                  * vblank start
 473                                  */
 474                                 vsync_pos = (vblank_width - vsync_width) / 2;
 475                                 adjusted_mode->crtc_vsync_start =
 476                                         adjusted_mode->crtc_vblank_start +
 477                                                         vsync_pos;
 478                                 /* keep the vsync width constant */
 479                                 adjusted_mode->crtc_vsync_end =
 480                                         adjusted_mode->crtc_vsync_start +
 481                                                         vsync_width;
 482                                 border = 1;
 483                         } else {
 484                         /* Aspects match, Let hw scale both directions */
 485                                 pfit_control |= (VERT_AUTO_SCALE |
 486                                                  HORIZ_AUTO_SCALE |
 487                                                  VERT_INTERP_BILINEAR |
 488                                                  HORIZ_INTERP_BILINEAR);
 489                         }
 490                         horiz_bits = (1 << bits) * horiz_ratio /
 491                                         PANEL_RATIO_FACTOR;
 492                         vert_bits = (1 << bits) * vert_ratio /
 493                                         PANEL_RATIO_FACTOR;
 494                         pfit_pgm_ratios =
 495                                 ((vert_bits << PFIT_VERT_SCALE_SHIFT) &
 496                                                 PFIT_VERT_SCALE_MASK) |
 497                                 ((horiz_bits << PFIT_HORIZ_SCALE_SHIFT) &
 498                                                 PFIT_HORIZ_SCALE_MASK);
 499                 }
 500                 break;
 501
 502         case DRM_MODE_SCALE_FULLSCREEN:
 503                 /*
 504                  * Full scaling, even if it changes the aspect ratio.
 505                  * Fortunately this is all done for us in hw.
 506                  */
 507                 pfit_control |= PFIT_ENABLE;
 508                 if (IS_I965G(dev))
 509                         pfit_control |= PFIT_SCALING_AUTO;
 510                 else
 511                         pfit_control |= (VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 512                                          VERT_INTERP_BILINEAR |
 513                                          HORIZ_INTERP_BILINEAR);
 514                 break;
 515         default:
 516                 break;
 517         }
 518
 519 out:
 520         lvds_priv->pfit_control = pfit_control;
 521         lvds_priv->pfit_pgm_ratios = pfit_pgm_ratios;
 522         /*
 523          * XXX: It would be nice to support lower refresh rates on the
 524          * panels to reduce power consumption, and perhaps match the
 525          * user's requested refresh rate.
 526          */
 527
 528         return true;
 529 }
 530
 531 static void intel_lvds_prepare(struct drm_encoder *encoder)
 532 {
 533         struct drm_device *dev = encoder->dev;
 534         struct drm_i915_private *dev_priv = dev->dev_private;
 535         u32 reg;
 536
 537         if (IS_IGDNG(dev))
 538                 reg = BLC_PWM_CPU_CTL;
 539         else
 540                 reg = BLC_PWM_CTL;
 541
 542         dev_priv->saveBLC_PWM_CTL = I915_READ(reg);
 543         dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
 544                                        BACKLIGHT_DUTY_CYCLE_MASK);
 545
 546         intel_lvds_set_power(dev, false);
 547 }
 548
 549 static void intel_lvds_commit( struct drm_encoder *encoder)
 550 {
 551         struct drm_device *dev = encoder->dev;
 552         struct drm_i915_private *dev_priv = dev->dev_private;
 553
 554         if (dev_priv->backlight_duty_cycle == 0)
 555                 dev_priv->backlight_duty_cycle =
 556                         intel_lvds_get_max_backlight(dev);
 557
 558         intel_lvds_set_power(dev, true);
 559 }
 560
 561 static void intel_lvds_mode_set(struct drm_encoder *encoder,
 562                                 struct drm_display_mode *mode,
 563                                 struct drm_display_mode *adjusted_mode)
 564 {
 565         struct drm_device *dev = encoder->dev;
 566         struct drm_i915_private *dev_priv = dev->dev_private;
 567         struct intel_output *intel_output = enc_to_intel_output(encoder);
 568         struct intel_lvds_priv *lvds_priv = intel_output->dev_priv;
 569
 570         /*
 571          * The LVDS pin pair will already have been turned on in the
 572          * intel_crtc_mode_set since it has a large impact on the DPLL
 573          * settings.
 574          */
 575
 576         /* No panel fitting yet, fixme */
 577         if (IS_IGDNG(dev))
 578                 return;
 579
 580         /*
 581          * Enable automatic panel scaling so that non-native modes fill the
 582          * screen.  Should be enabled before the pipe is enabled, according to
 583          * register description and PRM.
 584          */
 585         I915_WRITE(PFIT_PGM_RATIOS, lvds_priv->pfit_pgm_ratios);
 586         I915_WRITE(PFIT_CONTROL, lvds_priv->pfit_control);
 587 }
 588
 589 /**
 590  * Detect the LVDS connection.
 591  *
 592  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
 593  * connected and closed means disconnected.  We also send hotplug events as
 594  * needed, using lid status notification from the input layer.
 595  */
 596 static enum drm_connector_status intel_lvds_detect(struct drm_connector *connector)
 597 {
 598         enum drm_connector_status status = connector_status_connected;
 599
 600         if (!acpi_lid_open())
 601                 status = connector_status_disconnected;
 602
 603         return status;
 604 }
 605
 606 /**
 607  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 608  */
 609 static int intel_lvds_get_modes(struct drm_connector *connector)
 610 {
 611         struct drm_device *dev = connector->dev;
 612         struct intel_output *intel_output = to_intel_output(connector);
 613         struct drm_i915_private *dev_priv = dev->dev_private;
 614         int ret = 0;
 615
 616         ret = intel_ddc_get_modes(intel_output);
 617
 618         if (ret)
 619                 return ret;
 620
 621         /* Didn't get an EDID, so
 622          * Set wide sync ranges so we get all modes
 623          * handed to valid_mode for checking
 624          */
 625         connector->display_info.min_vfreq = 0;
 626         connector->display_info.max_vfreq = 200;
 627         connector->display_info.min_hfreq = 0;
 628         connector->display_info.max_hfreq = 200;
 629
 630         if (dev_priv->panel_fixed_mode != NULL) {
 631                 struct drm_display_mode *mode;
 632
 633                 mode = drm_mode_duplicate(dev, dev_priv->panel_fixed_mode);
 634                 drm_mode_probed_add(connector, mode);
 635
 636                 return 1;
 637         }
 638
 639         return 0;
 640 }
 641
 642 static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 643                             void *unused)
 644 {
 645         struct drm_i915_private *dev_priv =
 646                 container_of(nb, struct drm_i915_private, lid_notifier);
 647         struct drm_device *dev = dev_priv->dev;
 648
 649         if (acpi_lid_open())
 650                 drm_helper_resume_force_mode(dev);
 651
 652         drm_sysfs_hotplug_event(dev_priv->dev);
 653
 654         return NOTIFY_OK;
 655 }
 656
 657 /**
 658  * intel_lvds_destroy - unregister and free LVDS structures
 659  * @connector: connector to free
 660  *
 661  * Unregister the DDC bus for this connector then free the driver private
 662  * structure.
 663  */
 664 static void intel_lvds_destroy(struct drm_connector *connector)
 665 {
 666         struct drm_device *dev = connector->dev;
 667         struct intel_output *intel_output = to_intel_output(connector);
 668         struct drm_i915_private *dev_priv = dev->dev_private;
 669
 670         if (intel_output->ddc_bus)
 671                 intel_i2c_destroy(intel_output->ddc_bus);
 672         if (dev_priv->lid_notifier.notifier_call)
 673                 acpi_lid_notifier_unregister(&dev_priv->lid_notifier);
 674         drm_sysfs_connector_remove(connector);
 675         drm_connector_cleanup(connector);
 676         kfree(connector);
 677 }
 678
 679 static int intel_lvds_set_property(struct drm_connector *connector,
 680                                    struct drm_property *property,
 681                                    uint64_t value)
 682 {
 683         struct drm_device *dev = connector->dev;
 684         struct intel_output *intel_output =
 685                         to_intel_output(connector);
 686
 687         if (property == dev->mode_config.scaling_mode_property &&
 688                                 connector->encoder) {
 689                 struct drm_crtc *crtc = connector->encoder->crtc;
 690                 struct intel_lvds_priv *lvds_priv = intel_output->dev_priv;
 691                 if (value == DRM_MODE_SCALE_NONE) {
 692                         DRM_DEBUG_KMS("no scaling not supported\n");
 693                         return 0;
 694                 }
 695                 if (lvds_priv->fitting_mode == value) {
 696                         /* the LVDS scaling property is not changed */
 697                         return 0;
 698                 }
 699                 lvds_priv->fitting_mode = value;
 700                 if (crtc && crtc->enabled) {
 701                         /*
 702                          * If the CRTC is enabled, the display will be changed
 703                          * according to the new panel fitting mode.
 704                          */
 705                         drm_crtc_helper_set_mode(crtc, &crtc->mode,
 706                                 crtc->x, crtc->y, crtc->fb);
 707                 }
 708         }
 709
 710         return 0;
 711 }
 712
 713 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
 714         .dpms = intel_lvds_dpms,
 715         .mode_fixup = intel_lvds_mode_fixup,
 716         .prepare = intel_lvds_prepare,
 717         .mode_set = intel_lvds_mode_set,
 718         .commit = intel_lvds_commit,
 719 };
 720
 721 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 722         .get_modes = intel_lvds_get_modes,
 723         .mode_valid = intel_lvds_mode_valid,
 724         .best_encoder = intel_best_encoder,
 725 };
 726
 727 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 728         .dpms = drm_helper_connector_dpms,
 729         .save = intel_lvds_save,
 730         .restore = intel_lvds_restore,
 731         .detect = intel_lvds_detect,
 732         .fill_modes = drm_helper_probe_single_connector_modes,
 733         .set_property = intel_lvds_set_property,
 734         .destroy = intel_lvds_destroy,
 735 };
 736
 737
 738 static void intel_lvds_enc_destroy(struct drm_encoder *encoder)
 739 {
 740         drm_encoder_cleanup(encoder);
 741 }
 742
 743 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 744         .destroy = intel_lvds_enc_destroy,
 745 };
 746
 747 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 748 {
 749         DRM_DEBUG_KMS("Skipping LVDS initialization for %s\n", id->ident);
 750         return 1;
 751 }
 752
 753 /* These systems claim to have LVDS, but really don't */
 754 static const struct dmi_system_id intel_no_lvds[] = {
 755         {
 756                 .callback = intel_no_lvds_dmi_callback,
 757                 .ident = "Apple Mac Mini (Core series)",
 758                 .matches = {
 759                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 760                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 761                 },
 762         },
 763         {
 764                 .callback = intel_no_lvds_dmi_callback,
 765                 .ident = "Apple Mac Mini (Core 2 series)",
 766                 .matches = {
 767                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
 768                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 769                 },
 770         },
 771         {
 772                 .callback = intel_no_lvds_dmi_callback,
 773                 .ident = "MSI IM-945GSE-A",
 774                 .matches = {
 775                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 776                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 777                 },
 778         },
 779         {
 780                 .callback = intel_no_lvds_dmi_callback,
 781                 .ident = "Dell Studio Hybrid",
 782                 .matches = {
 783                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 784                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 785                 },
 786         },
 787         {
 788                 .callback = intel_no_lvds_dmi_callback,
 789                 .ident = "AOpen Mini PC",
 790                 .matches = {
 791                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
 792                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
 793                 },
 794         },
 795         {
 796                 .callback = intel_no_lvds_dmi_callback,
 797                 .ident = "AOpen Mini PC MP915",
 798                 .matches = {
 799                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
 800                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
 801                 },
 802         },
 803         {
 804                 .callback = intel_no_lvds_dmi_callback,
 805                 .ident = "Aopen i945GTt-VFA",
 806                 .matches = {
 807                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
 808                 },
 809         },
 810
 811         { }     /* terminating entry */
 812 };
 813
 814 #ifdef CONFIG_ACPI
 815 /*
 816  * check_lid_device -- check whether @handle is an ACPI LID device.
 817  * @handle: ACPI device handle
 818  * @level : depth in the ACPI namespace tree
 819  * @context: the number of LID device when we find the device
 820  * @rv: a return value to fill if desired (Not use)
 821  */
 822 static acpi_status
 823 check_lid_device(acpi_handle handle, u32 level, void *context,
 824                         void **return_value)
 825 {
 826         struct acpi_device *acpi_dev;
 827         int *lid_present = context;
 828
 829         acpi_dev = NULL;
 830         /* Get the acpi device for device handle */
 831         if (acpi_bus_get_device(handle, &acpi_dev) || !acpi_dev) {
 832                 /* If there is no ACPI device for handle, return */
 833                 return AE_OK;
 834         }
 835
 836         if (!strncmp(acpi_device_hid(acpi_dev), "PNP0C0D", 7))
 837                 *lid_present = 1;
 838
 839         return AE_OK;
 840 }
 841
 842 /**
 843  * check whether there exists the ACPI LID device by enumerating the ACPI
 844  * device tree.
 845  */
 846 static int intel_lid_present(void)
 847 {
 848         int lid_present = 0;
 849
 850         if (acpi_disabled) {
 851                 /* If ACPI is disabled, there is no ACPI device tree to
 852                  * check, so assume the LID device would have been present.
 853                  */
 854                 return 1;
 855         }
 856
 857         acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
 858                                 ACPI_UINT32_MAX,
 859                                 check_lid_device, &lid_present, NULL);
 860
 861         return lid_present;
 862 }
 863 #else
 864 static int intel_lid_present(void)
 865 {
 866         /* In the absence of ACPI built in, assume that the LID device would
 867          * have been present.
 868          */
 869         return 1;
 870 }
 871 #endif
 872
 873 /**
 874  * intel_lvds_init - setup LVDS connectors on this device
 875  * @dev: drm device
 876  *
 877  * Create the connector, register the LVDS DDC bus, and try to figure out what
 878  * modes we can display on the LVDS panel (if present).
 879  */
 880 void intel_lvds_init(struct drm_device *dev)
 881 {
 882         struct drm_i915_private *dev_priv = dev->dev_private;
 883         struct intel_output *intel_output;
 884         struct drm_connector *connector;
 885         struct drm_encoder *encoder;
 886         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 887         struct drm_crtc *crtc;
 888         struct intel_lvds_priv *lvds_priv;
 889         u32 lvds;
 890         int pipe, gpio = GPIOC;
 891
 892         /* Skip init on machines we know falsely report LVDS */
 893         if (dmi_check_system(intel_no_lvds))
 894                 return;
 895
 896         /* Assume that any device without an ACPI LID device also doesn't
 897          * have an integrated LVDS.  We would be better off parsing the BIOS
 898          * to get a reliable indicator, but that code isn't written yet.
 899          *
 900          * In the case of all-in-one desktops using LVDS that we've seen,
 901          * they're using SDVO LVDS.
 902          */
 903         if (!intel_lid_present())
 904                 return;
 905
 906         if (IS_IGDNG(dev)) {
 907                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
 908                         return;
 909                 if (dev_priv->edp_support) {
 910                         DRM_DEBUG("disable LVDS for eDP support\n");
 911                         return;
 912                 }
 913                 gpio = PCH_GPIOC;
 914         }
 915
 916         intel_output = kzalloc(sizeof(struct intel_output) +
 917                                 sizeof(struct intel_lvds_priv), GFP_KERNEL);
 918         if (!intel_output) {
 919                 return;
 920         }
 921
 922         connector = &intel_output->base;
 923         encoder = &intel_output->enc;
 924         drm_connector_init(dev, &intel_output->base, &intel_lvds_connector_funcs,
 925                            DRM_MODE_CONNECTOR_LVDS);
 926
 927         drm_encoder_init(dev, &intel_output->enc, &intel_lvds_enc_funcs,
 928                          DRM_MODE_ENCODER_LVDS);
 929
 930         drm_mode_connector_attach_encoder(&intel_output->base, &intel_output->enc);
 931         intel_output->type = INTEL_OUTPUT_LVDS;
 932
 933         intel_output->clone_mask = (1 << INTEL_LVDS_CLONE_BIT);
 934         intel_output->crtc_mask = (1 << 1);
 935         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
 936         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
 937         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 938         connector->interlace_allowed = false;
 939         connector->doublescan_allowed = false;
 940
 941         lvds_priv = (struct intel_lvds_priv *)(intel_output + 1);
 942         intel_output->dev_priv = lvds_priv;
 943         /* create the scaling mode property */
 944         drm_mode_create_scaling_mode_property(dev);
 945         /*
 946          * the initial panel fitting mode will be FULL_SCREEN.
 947          */
 948
 949         drm_connector_attach_property(&intel_output->base,
 950                                       dev->mode_config.scaling_mode_property,
 951                                       DRM_MODE_SCALE_FULLSCREEN);
 952         lvds_priv->fitting_mode = DRM_MODE_SCALE_FULLSCREEN;
 953         /*
 954          * LVDS discovery:
 955          * 1) check for EDID on DDC
 956          * 2) check for VBT data
 957          * 3) check to see if LVDS is already on
 958          *    if none of the above, no panel
 959          * 4) make sure lid is open
 960          *    if closed, act like it's not there for now
 961          */
 962
 963         /* Set up the DDC bus. */
 964         intel_output->ddc_bus = intel_i2c_create(dev, gpio, "LVDSDDC_C");
 965         if (!intel_output->ddc_bus) {
 966                 dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
 967                            "failed.\n");
 968                 goto failed;
 969         }
 970
 971         /*
 972          * Attempt to get the fixed panel mode from DDC.  Assume that the
 973          * preferred mode is the right one.
 974          */
 975         intel_ddc_get_modes(intel_output);
 976
 977         list_for_each_entry(scan, &connector->probed_modes, head) {
 978                 mutex_lock(&dev->mode_config.mutex);
 979                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
 980                         dev_priv->panel_fixed_mode =
 981                                 drm_mode_duplicate(dev, scan);
 982                         mutex_unlock(&dev->mode_config.mutex);
 983                         goto out;
 984                 }
 985                 mutex_unlock(&dev->mode_config.mutex);
 986         }
 987
 988         /* Failed to get EDID, what about VBT? */
 989         if (dev_priv->lfp_lvds_vbt_mode) {
 990                 mutex_lock(&dev->mode_config.mutex);
 991                 dev_priv->panel_fixed_mode =
 992                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
 993                 mutex_unlock(&dev->mode_config.mutex);
 994                 if (dev_priv->panel_fixed_mode) {
 995                         dev_priv->panel_fixed_mode->type |=
 996                                 DRM_MODE_TYPE_PREFERRED;
 997                         goto out;
 998                 }
 999         }
1000
1001         /*
1002          * If we didn't get EDID, try checking if the panel is already turned
1003          * on.  If so, assume that whatever is currently programmed is the
1004          * correct mode.
1005          */
1006
1007         /* IGDNG: FIXME if still fail, not try pipe mode now */
1008         if (IS_IGDNG(dev))
1009                 goto failed;
1010
1011         lvds = I915_READ(LVDS);
1012         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
1013         crtc = intel_get_crtc_from_pipe(dev, pipe);
1014
1015         if (crtc && (lvds & LVDS_PORT_EN)) {
1016                 dev_priv->panel_fixed_mode = intel_crtc_mode_get(dev, crtc);
1017                 if (dev_priv->panel_fixed_mode) {
1018                         dev_priv->panel_fixed_mode->type |=
1019                                 DRM_MODE_TYPE_PREFERRED;
1020                         goto out;
1021                 }
1022         }
1023
1024         /* If we still don't have a mode after all that, give up. */
1025         if (!dev_priv->panel_fixed_mode)
1026                 goto failed;
1027
1028 out:
1029         if (IS_IGDNG(dev)) {
1030                 u32 pwm;
1031                 /* make sure PWM is enabled */
1032                 pwm = I915_READ(BLC_PWM_CPU_CTL2);
1033                 pwm |= (PWM_ENABLE | PWM_PIPE_B);
1034                 I915_WRITE(BLC_PWM_CPU_CTL2, pwm);
1035
1036                 pwm = I915_READ(BLC_PWM_PCH_CTL1);
1037                 pwm |= PWM_PCH_ENABLE;
1038                 I915_WRITE(BLC_PWM_PCH_CTL1, pwm);
1039         }
1040         dev_priv->lid_notifier.notifier_call = intel_lid_notify;
1041         if (acpi_lid_notifier_register(&dev_priv->lid_notifier)) {
1042                 DRM_DEBUG("lid notifier registration failed\n");
1043                 dev_priv->lid_notifier.notifier_call = NULL;
1044         }
1045         drm_sysfs_connector_add(connector);
1046         return;
1047
1048 failed:
1049         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
1050         if (intel_output->ddc_bus)
1051                 intel_i2c_destroy(intel_output->ddc_bus);
1052         drm_connector_cleanup(connector);
1053         kfree(intel_output);
1054 }