drivers/gpu/drm/gma500/psb_intel_lvds.c

   1 /*
   2  * Copyright © 2006-2007 Intel Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  16  *
  17  * Authors:
  18  *      Eric Anholt <eric@anholt.net>
  19  *      Dave Airlie <airlied@linux.ie>
  20  *      Jesse Barnes <jesse.barnes@intel.com>
  21  */
  22
  23 #include <linux/i2c.h>
  24 #include <drm/drmP.h>
  25
  26 #include "intel_bios.h"
  27 #include "psb_drv.h"
  28 #include "psb_intel_drv.h"
  29 #include "psb_intel_reg.h"
  30 #include "power.h"
  31 #include <linux/pm_runtime.h>
  32
  33 /*
  34  * LVDS I2C backlight control macros
  35  */
  36 #define BRIGHTNESS_MAX_LEVEL 100
  37 #define BRIGHTNESS_MASK 0xFF
  38 #define BLC_I2C_TYPE    0x01
  39 #define BLC_PWM_TYPT    0x02
  40
  41 #define BLC_POLARITY_NORMAL 0
  42 #define BLC_POLARITY_INVERSE 1
  43
  44 #define PSB_BLC_MAX_PWM_REG_FREQ       (0xFFFE)
  45 #define PSB_BLC_MIN_PWM_REG_FREQ        (0x2)
  46 #define PSB_BLC_PWM_PRECISION_FACTOR    (10)
  47 #define PSB_BACKLIGHT_PWM_CTL_SHIFT     (16)
  48 #define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE)
  49
  50 struct psb_intel_lvds_priv {
  51         /*
  52          * Saved LVDO output states
  53          */
  54         uint32_t savePP_ON;
  55         uint32_t savePP_OFF;
  56         uint32_t saveLVDS;
  57         uint32_t savePP_CONTROL;
  58         uint32_t savePP_CYCLE;
  59         uint32_t savePFIT_CONTROL;
  60         uint32_t savePFIT_PGM_RATIOS;
  61         uint32_t saveBLC_PWM_CTL;
  62
  63         struct psb_intel_i2c_chan *i2c_bus;
  64         struct psb_intel_i2c_chan *ddc_bus;
  65 };
  66
  67
  68 /*
  69  * Returns the maximum level of the backlight duty cycle field.
  70  */
  71 static u32 psb_intel_lvds_get_max_backlight(struct drm_device *dev)
  72 {
  73         struct drm_psb_private *dev_priv = dev->dev_private;
  74         u32 ret;
  75
  76         if (gma_power_begin(dev, false)) {
  77                 ret = REG_READ(BLC_PWM_CTL);
  78                 gma_power_end(dev);
  79         } else /* Powered off, use the saved value */
  80                 ret = dev_priv->saveBLC_PWM_CTL;
  81
  82         /* Top 15bits hold the frequency mask */
  83         ret = (ret &  BACKLIGHT_MODULATION_FREQ_MASK) >>
  84                                         BACKLIGHT_MODULATION_FREQ_SHIFT;
  85
  86         ret *= 2;       /* Return a 16bit range as needed for setting */
  87         if (ret == 0)
  88                 dev_err(dev->dev, "BL bug: Reg %08x save %08X\n",
  89                         REG_READ(BLC_PWM_CTL), dev_priv->saveBLC_PWM_CTL);
  90         return ret;
  91 }
  92
  93 /*
  94  * Set LVDS backlight level by I2C command
  95  *
  96  * FIXME: at some point we need to both track this for PM and also
  97  * disable runtime pm on MRST if the brightness is nil (ie blanked)
  98  */
  99 static int psb_lvds_i2c_set_brightness(struct drm_device *dev,
 100                                         unsigned int level)
 101 {
 102         struct drm_psb_private *dev_priv =
 103                 (struct drm_psb_private *)dev->dev_private;
 104
 105         struct psb_intel_i2c_chan *lvds_i2c_bus = dev_priv->lvds_i2c_bus;
 106         u8 out_buf[2];
 107         unsigned int blc_i2c_brightness;
 108
 109         struct i2c_msg msgs[] = {
 110                 {
 111                         .addr = lvds_i2c_bus->slave_addr,
 112                         .flags = 0,
 113                         .len = 2,
 114                         .buf = out_buf,
 115                 }
 116         };
 117
 118         blc_i2c_brightness = BRIGHTNESS_MASK & ((unsigned int)level *
 119                              BRIGHTNESS_MASK /
 120                              BRIGHTNESS_MAX_LEVEL);
 121
 122         if (dev_priv->lvds_bl->pol == BLC_POLARITY_INVERSE)
 123                 blc_i2c_brightness = BRIGHTNESS_MASK - blc_i2c_brightness;
 124
 125         out_buf[0] = dev_priv->lvds_bl->brightnesscmd;
 126         out_buf[1] = (u8)blc_i2c_brightness;
 127
 128         if (i2c_transfer(&lvds_i2c_bus->adapter, msgs, 1) == 1) {
 129                 dev_dbg(dev->dev, "I2C set brightness.(command, value) (%d, %d)\n",
 130                         dev_priv->lvds_bl->brightnesscmd,
 131                         blc_i2c_brightness);
 132                 return 0;
 133         }
 134
 135         dev_err(dev->dev, "I2C transfer error\n");
 136         return -1;
 137 }
 138
 139
 140 static int psb_lvds_pwm_set_brightness(struct drm_device *dev, int level)
 141 {
 142         struct drm_psb_private *dev_priv =
 143                         (struct drm_psb_private *)dev->dev_private;
 144
 145         u32 max_pwm_blc;
 146         u32 blc_pwm_duty_cycle;
 147
 148         max_pwm_blc = psb_intel_lvds_get_max_backlight(dev);
 149
 150         /*BLC_PWM_CTL Should be initiated while backlight device init*/
 151         BUG_ON(max_pwm_blc == 0);
 152
 153         blc_pwm_duty_cycle = level * max_pwm_blc / BRIGHTNESS_MAX_LEVEL;
 154
 155         if (dev_priv->lvds_bl->pol == BLC_POLARITY_INVERSE)
 156                 blc_pwm_duty_cycle = max_pwm_blc - blc_pwm_duty_cycle;
 157
 158         blc_pwm_duty_cycle &= PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR;
 159         REG_WRITE(BLC_PWM_CTL,
 160                   (max_pwm_blc << PSB_BACKLIGHT_PWM_CTL_SHIFT) |
 161                   (blc_pwm_duty_cycle));
 162
 163         dev_info(dev->dev, "Backlight lvds set brightness %08x\n",
 164                   (max_pwm_blc << PSB_BACKLIGHT_PWM_CTL_SHIFT) |
 165                   (blc_pwm_duty_cycle));
 166
 167         return 0;
 168 }
 169
 170 /*
 171  * Set LVDS backlight level either by I2C or PWM
 172  */
 173 void psb_intel_lvds_set_brightness(struct drm_device *dev, int level)
 174 {
 175         struct drm_psb_private *dev_priv = dev->dev_private;
 176
 177         dev_dbg(dev->dev, "backlight level is %d\n", level);
 178
 179         if (!dev_priv->lvds_bl) {
 180                 dev_err(dev->dev, "NO LVDS backlight info\n");
 181                 return;
 182         }
 183
 184         if (dev_priv->lvds_bl->type == BLC_I2C_TYPE)
 185                 psb_lvds_i2c_set_brightness(dev, level);
 186         else
 187                 psb_lvds_pwm_set_brightness(dev, level);
 188 }
 189
 190 /*
 191  * Sets the backlight level.
 192  *
 193  * level: backlight level, from 0 to psb_intel_lvds_get_max_backlight().
 194  */
 195 static void psb_intel_lvds_set_backlight(struct drm_device *dev, int level)
 196 {
 197         struct drm_psb_private *dev_priv = dev->dev_private;
 198         u32 blc_pwm_ctl;
 199
 200         if (gma_power_begin(dev, false)) {
 201                 blc_pwm_ctl = REG_READ(BLC_PWM_CTL);
 202                 blc_pwm_ctl &= ~BACKLIGHT_DUTY_CYCLE_MASK;
 203                 REG_WRITE(BLC_PWM_CTL,
 204                                 (blc_pwm_ctl |
 205                                 (level << BACKLIGHT_DUTY_CYCLE_SHIFT)));
 206                 dev_priv->saveBLC_PWM_CTL = (blc_pwm_ctl |
 207                                         (level << BACKLIGHT_DUTY_CYCLE_SHIFT));
 208                 gma_power_end(dev);
 209         } else {
 210                 blc_pwm_ctl = dev_priv->saveBLC_PWM_CTL &
 211                                 ~BACKLIGHT_DUTY_CYCLE_MASK;
 212                 dev_priv->saveBLC_PWM_CTL = (blc_pwm_ctl |
 213                                         (level << BACKLIGHT_DUTY_CYCLE_SHIFT));
 214         }
 215 }
 216
 217 /*
 218  * Sets the power state for the panel.
 219  */
 220 static void psb_intel_lvds_set_power(struct drm_device *dev, bool on)
 221 {
 222         struct drm_psb_private *dev_priv = dev->dev_private;
 223         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 224         u32 pp_status;
 225
 226         if (!gma_power_begin(dev, true)) {
 227                 dev_err(dev->dev, "set power, chip off!\n");
 228                 return;
 229         }
 230
 231         if (on) {
 232                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) |
 233                           POWER_TARGET_ON);
 234                 do {
 235                         pp_status = REG_READ(PP_STATUS);
 236                 } while ((pp_status & PP_ON) == 0);
 237
 238                 psb_intel_lvds_set_backlight(dev,
 239                                              mode_dev->backlight_duty_cycle);
 240         } else {
 241                 psb_intel_lvds_set_backlight(dev, 0);
 242
 243                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) &
 244                           ~POWER_TARGET_ON);
 245                 do {
 246                         pp_status = REG_READ(PP_STATUS);
 247                 } while (pp_status & PP_ON);
 248         }
 249
 250         gma_power_end(dev);
 251 }
 252
 253 static void psb_intel_lvds_encoder_dpms(struct drm_encoder *encoder, int mode)
 254 {
 255         struct drm_device *dev = encoder->dev;
 256
 257         if (mode == DRM_MODE_DPMS_ON)
 258                 psb_intel_lvds_set_power(dev, true);
 259         else
 260                 psb_intel_lvds_set_power(dev, false);
 261
 262         /* XXX: We never power down the LVDS pairs. */
 263 }
 264
 265 static void psb_intel_lvds_save(struct drm_connector *connector)
 266 {
 267         struct drm_device *dev = connector->dev;
 268         struct drm_psb_private *dev_priv =
 269                 (struct drm_psb_private *)dev->dev_private;
 270         struct psb_intel_encoder *psb_intel_encoder =
 271                                         psb_intel_attached_encoder(connector);
 272         struct psb_intel_lvds_priv *lvds_priv =
 273                 (struct psb_intel_lvds_priv *)psb_intel_encoder->dev_priv;
 274
 275         lvds_priv->savePP_ON = REG_READ(LVDSPP_ON);
 276         lvds_priv->savePP_OFF = REG_READ(LVDSPP_OFF);
 277         lvds_priv->saveLVDS = REG_READ(LVDS);
 278         lvds_priv->savePP_CONTROL = REG_READ(PP_CONTROL);
 279         lvds_priv->savePP_CYCLE = REG_READ(PP_CYCLE);
 280         /*lvds_priv->savePP_DIVISOR = REG_READ(PP_DIVISOR);*/
 281         lvds_priv->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL);
 282         lvds_priv->savePFIT_CONTROL = REG_READ(PFIT_CONTROL);
 283         lvds_priv->savePFIT_PGM_RATIOS = REG_READ(PFIT_PGM_RATIOS);
 284
 285         /*TODO: move backlight_duty_cycle to psb_intel_lvds_priv*/
 286         dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
 287                                                 BACKLIGHT_DUTY_CYCLE_MASK);
 288
 289         /*
 290          * If the light is off at server startup,
 291          * just make it full brightness
 292          */
 293         if (dev_priv->backlight_duty_cycle == 0)
 294                 dev_priv->backlight_duty_cycle =
 295                 psb_intel_lvds_get_max_backlight(dev);
 296
 297         dev_dbg(dev->dev, "(0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x)\n",
 298                         lvds_priv->savePP_ON,
 299                         lvds_priv->savePP_OFF,
 300                         lvds_priv->saveLVDS,
 301                         lvds_priv->savePP_CONTROL,
 302                         lvds_priv->savePP_CYCLE,
 303                         lvds_priv->saveBLC_PWM_CTL);
 304 }
 305
 306 static void psb_intel_lvds_restore(struct drm_connector *connector)
 307 {
 308         struct drm_device *dev = connector->dev;
 309         u32 pp_status;
 310         struct psb_intel_encoder *psb_intel_encoder =
 311                                         psb_intel_attached_encoder(connector);
 312         struct psb_intel_lvds_priv *lvds_priv =
 313                 (struct psb_intel_lvds_priv *)psb_intel_encoder->dev_priv;
 314
 315         dev_dbg(dev->dev, "(0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x)\n",
 316                         lvds_priv->savePP_ON,
 317                         lvds_priv->savePP_OFF,
 318                         lvds_priv->saveLVDS,
 319                         lvds_priv->savePP_CONTROL,
 320                         lvds_priv->savePP_CYCLE,
 321                         lvds_priv->saveBLC_PWM_CTL);
 322
 323         REG_WRITE(BLC_PWM_CTL, lvds_priv->saveBLC_PWM_CTL);
 324         REG_WRITE(PFIT_CONTROL, lvds_priv->savePFIT_CONTROL);
 325         REG_WRITE(PFIT_PGM_RATIOS, lvds_priv->savePFIT_PGM_RATIOS);
 326         REG_WRITE(LVDSPP_ON, lvds_priv->savePP_ON);
 327         REG_WRITE(LVDSPP_OFF, lvds_priv->savePP_OFF);
 328         /*REG_WRITE(PP_DIVISOR, lvds_priv->savePP_DIVISOR);*/
 329         REG_WRITE(PP_CYCLE, lvds_priv->savePP_CYCLE);
 330         REG_WRITE(PP_CONTROL, lvds_priv->savePP_CONTROL);
 331         REG_WRITE(LVDS, lvds_priv->saveLVDS);
 332
 333         if (lvds_priv->savePP_CONTROL & POWER_TARGET_ON) {
 334                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) |
 335                         POWER_TARGET_ON);
 336                 do {
 337                         pp_status = REG_READ(PP_STATUS);
 338                 } while ((pp_status & PP_ON) == 0);
 339         } else {
 340                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) &
 341                         ~POWER_TARGET_ON);
 342                 do {
 343                         pp_status = REG_READ(PP_STATUS);
 344                 } while (pp_status & PP_ON);
 345         }
 346 }
 347
 348 int psb_intel_lvds_mode_valid(struct drm_connector *connector,
 349                                  struct drm_display_mode *mode)
 350 {
 351         struct drm_psb_private *dev_priv = connector->dev->dev_private;
 352         struct psb_intel_encoder *psb_intel_encoder =
 353                                         psb_intel_attached_encoder(connector);
 354         struct drm_display_mode *fixed_mode =
 355                                         dev_priv->mode_dev.panel_fixed_mode;
 356
 357         if (psb_intel_encoder->type == INTEL_OUTPUT_MIPI2)
 358                 fixed_mode = dev_priv->mode_dev.panel_fixed_mode2;
 359
 360         /* just in case */
 361         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 362                 return MODE_NO_DBLESCAN;
 363
 364         /* just in case */
 365         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 366                 return MODE_NO_INTERLACE;
 367
 368         if (fixed_mode) {
 369                 if (mode->hdisplay > fixed_mode->hdisplay)
 370                         return MODE_PANEL;
 371                 if (mode->vdisplay > fixed_mode->vdisplay)
 372                         return MODE_PANEL;
 373         }
 374         return MODE_OK;
 375 }
 376
 377 bool psb_intel_lvds_mode_fixup(struct drm_encoder *encoder,
 378                                   struct drm_display_mode *mode,
 379                                   struct drm_display_mode *adjusted_mode)
 380 {
 381         struct drm_device *dev = encoder->dev;
 382         struct drm_psb_private *dev_priv = dev->dev_private;
 383         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 384         struct psb_intel_crtc *psb_intel_crtc =
 385                                 to_psb_intel_crtc(encoder->crtc);
 386         struct drm_encoder *tmp_encoder;
 387         struct drm_display_mode *panel_fixed_mode = mode_dev->panel_fixed_mode;
 388         struct psb_intel_encoder *psb_intel_encoder =
 389                                                 to_psb_intel_encoder(encoder);
 390
 391         if (psb_intel_encoder->type == INTEL_OUTPUT_MIPI2)
 392                 panel_fixed_mode = mode_dev->panel_fixed_mode2;
 393
 394         /* PSB requires the LVDS is on pipe B, MRST has only one pipe anyway */
 395         if (!IS_MRST(dev) && psb_intel_crtc->pipe == 0) {
 396                 printk(KERN_ERR "Can't support LVDS on pipe A\n");
 397                 return false;
 398         }
 399         if (IS_MRST(dev) && psb_intel_crtc->pipe != 0) {
 400                 printk(KERN_ERR "Must use PIPE A\n");
 401                 return false;
 402         }
 403         /* Should never happen!! */
 404         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list,
 405                             head) {
 406                 if (tmp_encoder != encoder
 407                     && tmp_encoder->crtc == encoder->crtc) {
 408                         printk(KERN_ERR "Can't enable LVDS and another "
 409                                "encoder on the same pipe\n");
 410                         return false;
 411                 }
 412         }
 413
 414         /*
 415          * If we have timings from the BIOS for the panel, put them in
 416          * to the adjusted mode.  The CRTC will be set up for this mode,
 417          * with the panel scaling set up to source from the H/VDisplay
 418          * of the original mode.
 419          */
 420         if (panel_fixed_mode != NULL) {
 421                 adjusted_mode->hdisplay = panel_fixed_mode->hdisplay;
 422                 adjusted_mode->hsync_start = panel_fixed_mode->hsync_start;
 423                 adjusted_mode->hsync_end = panel_fixed_mode->hsync_end;
 424                 adjusted_mode->htotal = panel_fixed_mode->htotal;
 425                 adjusted_mode->vdisplay = panel_fixed_mode->vdisplay;
 426                 adjusted_mode->vsync_start = panel_fixed_mode->vsync_start;
 427                 adjusted_mode->vsync_end = panel_fixed_mode->vsync_end;
 428                 adjusted_mode->vtotal = panel_fixed_mode->vtotal;
 429                 adjusted_mode->clock = panel_fixed_mode->clock;
 430                 drm_mode_set_crtcinfo(adjusted_mode,
 431                                       CRTC_INTERLACE_HALVE_V);
 432         }
 433
 434         /*
 435          * XXX: It would be nice to support lower refresh rates on the
 436          * panels to reduce power consumption, and perhaps match the
 437          * user's requested refresh rate.
 438          */
 439
 440         return true;
 441 }
 442
 443 static void psb_intel_lvds_prepare(struct drm_encoder *encoder)
 444 {
 445         struct drm_device *dev = encoder->dev;
 446         struct drm_psb_private *dev_priv = dev->dev_private;
 447         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 448
 449         if (!gma_power_begin(dev, true))
 450                 return;
 451
 452         mode_dev->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL);
 453         mode_dev->backlight_duty_cycle = (mode_dev->saveBLC_PWM_CTL &
 454                                           BACKLIGHT_DUTY_CYCLE_MASK);
 455
 456         psb_intel_lvds_set_power(dev, false);
 457
 458         gma_power_end(dev);
 459 }
 460
 461 static void psb_intel_lvds_commit(struct drm_encoder *encoder)
 462 {
 463         struct drm_device *dev = encoder->dev;
 464         struct drm_psb_private *dev_priv = dev->dev_private;
 465         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 466
 467         if (mode_dev->backlight_duty_cycle == 0)
 468                 mode_dev->backlight_duty_cycle =
 469                     psb_intel_lvds_get_max_backlight(dev);
 470
 471         psb_intel_lvds_set_power(dev, true);
 472 }
 473
 474 static void psb_intel_lvds_mode_set(struct drm_encoder *encoder,
 475                                 struct drm_display_mode *mode,
 476                                 struct drm_display_mode *adjusted_mode)
 477 {
 478         struct drm_device *dev = encoder->dev;
 479         struct drm_psb_private *dev_priv = dev->dev_private;
 480         u32 pfit_control;
 481
 482         /*
 483          * The LVDS pin pair will already have been turned on in the
 484          * psb_intel_crtc_mode_set since it has a large impact on the DPLL
 485          * settings.
 486          */
 487
 488         /*
 489          * Enable automatic panel scaling so that non-native modes fill the
 490          * screen.  Should be enabled before the pipe is enabled, according to
 491          * register description and PRM.
 492          */
 493         if (mode->hdisplay != adjusted_mode->hdisplay ||
 494             mode->vdisplay != adjusted_mode->vdisplay)
 495                 pfit_control = (PFIT_ENABLE | VERT_AUTO_SCALE |
 496                                 HORIZ_AUTO_SCALE | VERT_INTERP_BILINEAR |
 497                                 HORIZ_INTERP_BILINEAR);
 498         else
 499                 pfit_control = 0;
 500
 501         if (dev_priv->lvds_dither)
 502                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 503
 504         REG_WRITE(PFIT_CONTROL, pfit_control);
 505 }
 506
 507 /*
 508  * Detect the LVDS connection.
 509  *
 510  * This always returns CONNECTOR_STATUS_CONNECTED.
 511  * This connector should only have
 512  * been set up if the LVDS was actually connected anyway.
 513  */
 514 static enum drm_connector_status psb_intel_lvds_detect(struct drm_connector
 515                                                    *connector, bool force)
 516 {
 517         return connector_status_connected;
 518 }
 519
 520 /*
 521  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 522  */
 523 static int psb_intel_lvds_get_modes(struct drm_connector *connector)
 524 {
 525         struct drm_device *dev = connector->dev;
 526         struct drm_psb_private *dev_priv = dev->dev_private;
 527         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 528         struct psb_intel_encoder *psb_intel_encoder =
 529                                         psb_intel_attached_encoder(connector);
 530         struct psb_intel_lvds_priv *lvds_priv = psb_intel_encoder->dev_priv;
 531         int ret = 0;
 532
 533         if (!IS_MRST(dev))
 534                 ret = psb_intel_ddc_get_modes(connector, &lvds_priv->i2c_bus->adapter);
 535
 536         if (ret)
 537                 return ret;
 538
 539         /* Didn't get an EDID, so
 540          * Set wide sync ranges so we get all modes
 541          * handed to valid_mode for checking
 542          */
 543         connector->display_info.min_vfreq = 0;
 544         connector->display_info.max_vfreq = 200;
 545         connector->display_info.min_hfreq = 0;
 546         connector->display_info.max_hfreq = 200;
 547
 548         if (mode_dev->panel_fixed_mode != NULL) {
 549                 struct drm_display_mode *mode =
 550                     drm_mode_duplicate(dev, mode_dev->panel_fixed_mode);
 551                 drm_mode_probed_add(connector, mode);
 552                 return 1;
 553         }
 554
 555         return 0;
 556 }
 557
 558 /**
 559  * psb_intel_lvds_destroy - unregister and free LVDS structures
 560  * @connector: connector to free
 561  *
 562  * Unregister the DDC bus for this connector then free the driver private
 563  * structure.
 564  */
 565 void psb_intel_lvds_destroy(struct drm_connector *connector)
 566 {
 567         struct psb_intel_encoder *psb_intel_encoder =
 568                                         psb_intel_attached_encoder(connector);
 569         struct psb_intel_lvds_priv *lvds_priv = psb_intel_encoder->dev_priv;
 570
 571         if (lvds_priv->ddc_bus)
 572                 psb_intel_i2c_destroy(lvds_priv->ddc_bus);
 573         drm_sysfs_connector_remove(connector);
 574         drm_connector_cleanup(connector);
 575         kfree(connector);
 576 }
 577
 578 int psb_intel_lvds_set_property(struct drm_connector *connector,
 579                                        struct drm_property *property,
 580                                        uint64_t value)
 581 {
 582         struct drm_encoder *encoder = connector->encoder;
 583
 584         if (!encoder)
 585                 return -1;
 586
 587         if (!strcmp(property->name, "scaling mode")) {
 588                 struct psb_intel_crtc *crtc =
 589                                         to_psb_intel_crtc(encoder->crtc);
 590                 uint64_t curval;
 591
 592                 if (!crtc)
 593                         goto set_prop_error;
 594
 595                 switch (value) {
 596                 case DRM_MODE_SCALE_FULLSCREEN:
 597                         break;
 598                 case DRM_MODE_SCALE_NO_SCALE:
 599                         break;
 600                 case DRM_MODE_SCALE_ASPECT:
 601                         break;
 602                 default:
 603                         goto set_prop_error;
 604                 }
 605
 606                 if (drm_connector_property_get_value(connector,
 607                                                      property,
 608                                                      &curval))
 609                         goto set_prop_error;
 610
 611                 if (curval == value)
 612                         goto set_prop_done;
 613
 614                 if (drm_connector_property_set_value(connector,
 615                                                         property,
 616                                                         value))
 617                         goto set_prop_error;
 618
 619                 if (crtc->saved_mode.hdisplay != 0 &&
 620                     crtc->saved_mode.vdisplay != 0) {
 621                         if (!drm_crtc_helper_set_mode(encoder->crtc,
 622                                                       &crtc->saved_mode,
 623                                                       encoder->crtc->x,
 624                                                       encoder->crtc->y,
 625                                                       encoder->crtc->fb))
 626                                 goto set_prop_error;
 627                 }
 628         } else if (!strcmp(property->name, "backlight")) {
 629                 if (drm_connector_property_set_value(connector,
 630                                                         property,
 631                                                         value))
 632                         goto set_prop_error;
 633                 else {
 634 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
 635                         struct drm_psb_private *devp =
 636                                                 encoder->dev->dev_private;
 637                         struct backlight_device *bd = devp->backlight_device;
 638                         if (bd) {
 639                                 bd->props.brightness = value;
 640                                 backlight_update_status(bd);
 641                         }
 642 #endif
 643                 }
 644         } else if (!strcmp(property->name, "DPMS")) {
 645                 struct drm_encoder_helper_funcs *hfuncs
 646                                                 = encoder->helper_private;
 647                 hfuncs->dpms(encoder, value);
 648         }
 649
 650 set_prop_done:
 651         return 0;
 652 set_prop_error:
 653         return -1;
 654 }
 655
 656 static const struct drm_encoder_helper_funcs psb_intel_lvds_helper_funcs = {
 657         .dpms = psb_intel_lvds_encoder_dpms,
 658         .mode_fixup = psb_intel_lvds_mode_fixup,
 659         .prepare = psb_intel_lvds_prepare,
 660         .mode_set = psb_intel_lvds_mode_set,
 661         .commit = psb_intel_lvds_commit,
 662 };
 663
 664 const struct drm_connector_helper_funcs
 665                                 psb_intel_lvds_connector_helper_funcs = {
 666         .get_modes = psb_intel_lvds_get_modes,
 667         .mode_valid = psb_intel_lvds_mode_valid,
 668         .best_encoder = psb_intel_best_encoder,
 669 };
 670
 671 const struct drm_connector_funcs psb_intel_lvds_connector_funcs = {
 672         .dpms = drm_helper_connector_dpms,
 673         .save = psb_intel_lvds_save,
 674         .restore = psb_intel_lvds_restore,
 675         .detect = psb_intel_lvds_detect,
 676         .fill_modes = drm_helper_probe_single_connector_modes,
 677         .set_property = psb_intel_lvds_set_property,
 678         .destroy = psb_intel_lvds_destroy,
 679 };
 680
 681
 682 static void psb_intel_lvds_enc_destroy(struct drm_encoder *encoder)
 683 {
 684         drm_encoder_cleanup(encoder);
 685 }
 686
 687 const struct drm_encoder_funcs psb_intel_lvds_enc_funcs = {
 688         .destroy = psb_intel_lvds_enc_destroy,
 689 };
 690
 691
 692
 693 /**
 694  * psb_intel_lvds_init - setup LVDS connectors on this device
 695  * @dev: drm device
 696  *
 697  * Create the connector, register the LVDS DDC bus, and try to figure out what
 698  * modes we can display on the LVDS panel (if present).
 699  */
 700 void psb_intel_lvds_init(struct drm_device *dev,
 701                          struct psb_intel_mode_device *mode_dev)
 702 {
 703         struct psb_intel_encoder *psb_intel_encoder;
 704         struct psb_intel_connector *psb_intel_connector;
 705         struct psb_intel_lvds_priv *lvds_priv;
 706         struct drm_connector *connector;
 707         struct drm_encoder *encoder;
 708         struct drm_display_mode *scan;  /* *modes, *bios_mode; */
 709         struct drm_crtc *crtc;
 710         struct drm_psb_private *dev_priv = dev->dev_private;
 711         u32 lvds;
 712         int pipe;
 713
 714         psb_intel_encoder =
 715                         kzalloc(sizeof(struct psb_intel_encoder), GFP_KERNEL);
 716
 717         if (!psb_intel_encoder) {
 718                 dev_err(dev->dev, "psb_intel_encoder allocation error\n");
 719                 return;
 720         }
 721
 722         psb_intel_connector =
 723                 kzalloc(sizeof(struct psb_intel_connector), GFP_KERNEL);
 724
 725         if (!psb_intel_connector) {
 726                 kfree(psb_intel_encoder);
 727                 dev_err(dev->dev, "psb_intel_connector allocation error\n");
 728         }
 729
 730         lvds_priv = kzalloc(sizeof(struct psb_intel_lvds_priv), GFP_KERNEL);
 731         if (!lvds_priv) {
 732                 dev_err(dev->dev, "LVDS private allocation error\n");
 733                 goto failed_connector;
 734         }
 735
 736         psb_intel_encoder->dev_priv = lvds_priv;
 737
 738         connector = &psb_intel_connector->base;
 739         encoder = &psb_intel_encoder->base;
 740         drm_connector_init(dev, connector,
 741                            &psb_intel_lvds_connector_funcs,
 742                            DRM_MODE_CONNECTOR_LVDS);
 743
 744         drm_encoder_init(dev, encoder,
 745                          &psb_intel_lvds_enc_funcs,
 746                          DRM_MODE_ENCODER_LVDS);
 747
 748         psb_intel_connector_attach_encoder(psb_intel_connector,
 749                                            psb_intel_encoder);
 750         psb_intel_encoder->type = INTEL_OUTPUT_LVDS;
 751
 752         drm_encoder_helper_add(encoder, &psb_intel_lvds_helper_funcs);
 753         drm_connector_helper_add(connector,
 754                                  &psb_intel_lvds_connector_helper_funcs);
 755         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 756         connector->interlace_allowed = false;
 757         connector->doublescan_allowed = false;
 758
 759         /*Attach connector properties*/
 760         drm_connector_attach_property(connector,
 761                                       dev->mode_config.scaling_mode_property,
 762                                       DRM_MODE_SCALE_FULLSCREEN);
 763         drm_connector_attach_property(connector,
 764                                       dev_priv->backlight_property,
 765                                       BRIGHTNESS_MAX_LEVEL);
 766
 767         /*
 768          * Set up I2C bus
 769          * FIXME: distroy i2c_bus when exit
 770          */
 771         lvds_priv->i2c_bus = psb_intel_i2c_create(dev, GPIOB, "LVDSBLC_B");
 772         if (!lvds_priv->i2c_bus) {
 773                 dev_printk(KERN_ERR,
 774                         &dev->pdev->dev, "I2C bus registration failed.\n");
 775                 goto failed_blc_i2c;
 776         }
 777         lvds_priv->i2c_bus->slave_addr = 0x2C;
 778         dev_priv->lvds_i2c_bus =  lvds_priv->i2c_bus;
 779
 780         /*
 781          * LVDS discovery:
 782          * 1) check for EDID on DDC
 783          * 2) check for VBT data
 784          * 3) check to see if LVDS is already on
 785          *    if none of the above, no panel
 786          * 4) make sure lid is open
 787          *    if closed, act like it's not there for now
 788          */
 789
 790         /* Set up the DDC bus. */
 791         lvds_priv->ddc_bus = psb_intel_i2c_create(dev, GPIOC, "LVDSDDC_C");
 792         if (!lvds_priv->ddc_bus) {
 793                 dev_printk(KERN_ERR, &dev->pdev->dev,
 794                            "DDC bus registration " "failed.\n");
 795                 goto failed_ddc;
 796         }
 797
 798         /*
 799          * Attempt to get the fixed panel mode from DDC.  Assume that the
 800          * preferred mode is the right one.
 801          */
 802         psb_intel_ddc_get_modes(connector, &lvds_priv->ddc_bus->adapter);
 803         list_for_each_entry(scan, &connector->probed_modes, head) {
 804                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
 805                         mode_dev->panel_fixed_mode =
 806                             drm_mode_duplicate(dev, scan);
 807                         goto out;       /* FIXME: check for quirks */
 808                 }
 809         }
 810
 811         /* Failed to get EDID, what about VBT? do we need this? */
 812         if (mode_dev->vbt_mode)
 813                 mode_dev->panel_fixed_mode =
 814                     drm_mode_duplicate(dev, mode_dev->vbt_mode);
 815
 816         if (!mode_dev->panel_fixed_mode)
 817                 if (dev_priv->lfp_lvds_vbt_mode)
 818                         mode_dev->panel_fixed_mode =
 819                                 drm_mode_duplicate(dev,
 820                                         dev_priv->lfp_lvds_vbt_mode);
 821
 822         /*
 823          * If we didn't get EDID, try checking if the panel is already turned
 824          * on.  If so, assume that whatever is currently programmed is the
 825          * correct mode.
 826          */
 827         lvds = REG_READ(LVDS);
 828         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
 829         crtc = psb_intel_get_crtc_from_pipe(dev, pipe);
 830
 831         if (crtc && (lvds & LVDS_PORT_EN)) {
 832                 mode_dev->panel_fixed_mode =
 833                     psb_intel_crtc_mode_get(dev, crtc);
 834                 if (mode_dev->panel_fixed_mode) {
 835                         mode_dev->panel_fixed_mode->type |=
 836                             DRM_MODE_TYPE_PREFERRED;
 837                         goto out;       /* FIXME: check for quirks */
 838                 }
 839         }
 840
 841         /* If we still don't have a mode after all that, give up. */
 842         if (!mode_dev->panel_fixed_mode) {
 843                 dev_err(dev->dev, "Found no modes on the lvds, ignoring the LVDS\n");
 844                 goto failed_find;
 845         }
 846
 847         /*
 848          * Blacklist machines with BIOSes that list an LVDS panel without
 849          * actually having one.
 850          */
 851 out:
 852         drm_sysfs_connector_add(connector);
 853         return;
 854
 855 failed_find:
 856         if (lvds_priv->ddc_bus)
 857                 psb_intel_i2c_destroy(lvds_priv->ddc_bus);
 858 failed_ddc:
 859         if (lvds_priv->i2c_bus)
 860                 psb_intel_i2c_destroy(lvds_priv->i2c_bus);
 861 failed_blc_i2c:
 862         drm_encoder_cleanup(encoder);
 863         drm_connector_cleanup(connector);
 864 failed_connector:
 865         if (psb_intel_connector)
 866                 kfree(psb_intel_connector);
 867 }
 868