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->regs.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->regs.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->regs.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->regs.saveBLC_PWM_CTL &
 211                                 ~BACKLIGHT_DUTY_CYCLE_MASK;
 212                 dev_priv->regs.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 gma_encoder *gma_encoder = gma_attached_encoder(connector);
 271         struct psb_intel_lvds_priv *lvds_priv =
 272                 (struct psb_intel_lvds_priv *)gma_encoder->dev_priv;
 273
 274         lvds_priv->savePP_ON = REG_READ(LVDSPP_ON);
 275         lvds_priv->savePP_OFF = REG_READ(LVDSPP_OFF);
 276         lvds_priv->saveLVDS = REG_READ(LVDS);
 277         lvds_priv->savePP_CONTROL = REG_READ(PP_CONTROL);
 278         lvds_priv->savePP_CYCLE = REG_READ(PP_CYCLE);
 279         /*lvds_priv->savePP_DIVISOR = REG_READ(PP_DIVISOR);*/
 280         lvds_priv->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL);
 281         lvds_priv->savePFIT_CONTROL = REG_READ(PFIT_CONTROL);
 282         lvds_priv->savePFIT_PGM_RATIOS = REG_READ(PFIT_PGM_RATIOS);
 283
 284         /*TODO: move backlight_duty_cycle to psb_intel_lvds_priv*/
 285         dev_priv->backlight_duty_cycle = (dev_priv->regs.saveBLC_PWM_CTL &
 286                                                 BACKLIGHT_DUTY_CYCLE_MASK);
 287
 288         /*
 289          * If the light is off at server startup,
 290          * just make it full brightness
 291          */
 292         if (dev_priv->backlight_duty_cycle == 0)
 293                 dev_priv->backlight_duty_cycle =
 294                 psb_intel_lvds_get_max_backlight(dev);
 295
 296         dev_dbg(dev->dev, "(0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x)\n",
 297                         lvds_priv->savePP_ON,
 298                         lvds_priv->savePP_OFF,
 299                         lvds_priv->saveLVDS,
 300                         lvds_priv->savePP_CONTROL,
 301                         lvds_priv->savePP_CYCLE,
 302                         lvds_priv->saveBLC_PWM_CTL);
 303 }
 304
 305 static void psb_intel_lvds_restore(struct drm_connector *connector)
 306 {
 307         struct drm_device *dev = connector->dev;
 308         u32 pp_status;
 309         struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 310         struct psb_intel_lvds_priv *lvds_priv =
 311                 (struct psb_intel_lvds_priv *)gma_encoder->dev_priv;
 312
 313         dev_dbg(dev->dev, "(0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x)\n",
 314                         lvds_priv->savePP_ON,
 315                         lvds_priv->savePP_OFF,
 316                         lvds_priv->saveLVDS,
 317                         lvds_priv->savePP_CONTROL,
 318                         lvds_priv->savePP_CYCLE,
 319                         lvds_priv->saveBLC_PWM_CTL);
 320
 321         REG_WRITE(BLC_PWM_CTL, lvds_priv->saveBLC_PWM_CTL);
 322         REG_WRITE(PFIT_CONTROL, lvds_priv->savePFIT_CONTROL);
 323         REG_WRITE(PFIT_PGM_RATIOS, lvds_priv->savePFIT_PGM_RATIOS);
 324         REG_WRITE(LVDSPP_ON, lvds_priv->savePP_ON);
 325         REG_WRITE(LVDSPP_OFF, lvds_priv->savePP_OFF);
 326         /*REG_WRITE(PP_DIVISOR, lvds_priv->savePP_DIVISOR);*/
 327         REG_WRITE(PP_CYCLE, lvds_priv->savePP_CYCLE);
 328         REG_WRITE(PP_CONTROL, lvds_priv->savePP_CONTROL);
 329         REG_WRITE(LVDS, lvds_priv->saveLVDS);
 330
 331         if (lvds_priv->savePP_CONTROL & POWER_TARGET_ON) {
 332                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) |
 333                         POWER_TARGET_ON);
 334                 do {
 335                         pp_status = REG_READ(PP_STATUS);
 336                 } while ((pp_status & PP_ON) == 0);
 337         } else {
 338                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) &
 339                         ~POWER_TARGET_ON);
 340                 do {
 341                         pp_status = REG_READ(PP_STATUS);
 342                 } while (pp_status & PP_ON);
 343         }
 344 }
 345
 346 int psb_intel_lvds_mode_valid(struct drm_connector *connector,
 347                                  struct drm_display_mode *mode)
 348 {
 349         struct drm_psb_private *dev_priv = connector->dev->dev_private;
 350         struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 351         struct drm_display_mode *fixed_mode =
 352                                         dev_priv->mode_dev.panel_fixed_mode;
 353
 354         if (gma_encoder->type == INTEL_OUTPUT_MIPI2)
 355                 fixed_mode = dev_priv->mode_dev.panel_fixed_mode2;
 356
 357         /* just in case */
 358         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 359                 return MODE_NO_DBLESCAN;
 360
 361         /* just in case */
 362         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 363                 return MODE_NO_INTERLACE;
 364
 365         if (fixed_mode) {
 366                 if (mode->hdisplay > fixed_mode->hdisplay)
 367                         return MODE_PANEL;
 368                 if (mode->vdisplay > fixed_mode->vdisplay)
 369                         return MODE_PANEL;
 370         }
 371         return MODE_OK;
 372 }
 373
 374 bool psb_intel_lvds_mode_fixup(struct drm_encoder *encoder,
 375                                   const struct drm_display_mode *mode,
 376                                   struct drm_display_mode *adjusted_mode)
 377 {
 378         struct drm_device *dev = encoder->dev;
 379         struct drm_psb_private *dev_priv = dev->dev_private;
 380         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 381         struct gma_crtc *gma_crtc = to_gma_crtc(encoder->crtc);
 382         struct drm_encoder *tmp_encoder;
 383         struct drm_display_mode *panel_fixed_mode = mode_dev->panel_fixed_mode;
 384         struct gma_encoder *gma_encoder = to_gma_encoder(encoder);
 385
 386         if (gma_encoder->type == INTEL_OUTPUT_MIPI2)
 387                 panel_fixed_mode = mode_dev->panel_fixed_mode2;
 388
 389         /* PSB requires the LVDS is on pipe B, MRST has only one pipe anyway */
 390         if (!IS_MRST(dev) && gma_crtc->pipe == 0) {
 391                 printk(KERN_ERR "Can't support LVDS on pipe A\n");
 392                 return false;
 393         }
 394         if (IS_MRST(dev) && gma_crtc->pipe != 0) {
 395                 printk(KERN_ERR "Must use PIPE A\n");
 396                 return false;
 397         }
 398         /* Should never happen!! */
 399         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list,
 400                             head) {
 401                 if (tmp_encoder != encoder
 402                     && tmp_encoder->crtc == encoder->crtc) {
 403                         printk(KERN_ERR "Can't enable LVDS and another "
 404                                "encoder on the same pipe\n");
 405                         return false;
 406                 }
 407         }
 408
 409         /*
 410          * If we have timings from the BIOS for the panel, put them in
 411          * to the adjusted mode.  The CRTC will be set up for this mode,
 412          * with the panel scaling set up to source from the H/VDisplay
 413          * of the original mode.
 414          */
 415         if (panel_fixed_mode != NULL) {
 416                 adjusted_mode->hdisplay = panel_fixed_mode->hdisplay;
 417                 adjusted_mode->hsync_start = panel_fixed_mode->hsync_start;
 418                 adjusted_mode->hsync_end = panel_fixed_mode->hsync_end;
 419                 adjusted_mode->htotal = panel_fixed_mode->htotal;
 420                 adjusted_mode->vdisplay = panel_fixed_mode->vdisplay;
 421                 adjusted_mode->vsync_start = panel_fixed_mode->vsync_start;
 422                 adjusted_mode->vsync_end = panel_fixed_mode->vsync_end;
 423                 adjusted_mode->vtotal = panel_fixed_mode->vtotal;
 424                 adjusted_mode->clock = panel_fixed_mode->clock;
 425                 drm_mode_set_crtcinfo(adjusted_mode,
 426                                       CRTC_INTERLACE_HALVE_V);
 427         }
 428
 429         /*
 430          * XXX: It would be nice to support lower refresh rates on the
 431          * panels to reduce power consumption, and perhaps match the
 432          * user's requested refresh rate.
 433          */
 434
 435         return true;
 436 }
 437
 438 static void psb_intel_lvds_prepare(struct drm_encoder *encoder)
 439 {
 440         struct drm_device *dev = encoder->dev;
 441         struct drm_psb_private *dev_priv = dev->dev_private;
 442         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 443
 444         if (!gma_power_begin(dev, true))
 445                 return;
 446
 447         mode_dev->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL);
 448         mode_dev->backlight_duty_cycle = (mode_dev->saveBLC_PWM_CTL &
 449                                           BACKLIGHT_DUTY_CYCLE_MASK);
 450
 451         psb_intel_lvds_set_power(dev, false);
 452
 453         gma_power_end(dev);
 454 }
 455
 456 static void psb_intel_lvds_commit(struct drm_encoder *encoder)
 457 {
 458         struct drm_device *dev = encoder->dev;
 459         struct drm_psb_private *dev_priv = dev->dev_private;
 460         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 461
 462         if (mode_dev->backlight_duty_cycle == 0)
 463                 mode_dev->backlight_duty_cycle =
 464                     psb_intel_lvds_get_max_backlight(dev);
 465
 466         psb_intel_lvds_set_power(dev, true);
 467 }
 468
 469 static void psb_intel_lvds_mode_set(struct drm_encoder *encoder,
 470                                 struct drm_display_mode *mode,
 471                                 struct drm_display_mode *adjusted_mode)
 472 {
 473         struct drm_device *dev = encoder->dev;
 474         struct drm_psb_private *dev_priv = dev->dev_private;
 475         u32 pfit_control;
 476
 477         /*
 478          * The LVDS pin pair will already have been turned on in the
 479          * psb_intel_crtc_mode_set since it has a large impact on the DPLL
 480          * settings.
 481          */
 482
 483         /*
 484          * Enable automatic panel scaling so that non-native modes fill the
 485          * screen.  Should be enabled before the pipe is enabled, according to
 486          * register description and PRM.
 487          */
 488         if (mode->hdisplay != adjusted_mode->hdisplay ||
 489             mode->vdisplay != adjusted_mode->vdisplay)
 490                 pfit_control = (PFIT_ENABLE | VERT_AUTO_SCALE |
 491                                 HORIZ_AUTO_SCALE | VERT_INTERP_BILINEAR |
 492                                 HORIZ_INTERP_BILINEAR);
 493         else
 494                 pfit_control = 0;
 495
 496         if (dev_priv->lvds_dither)
 497                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 498
 499         REG_WRITE(PFIT_CONTROL, pfit_control);
 500 }
 501
 502 /*
 503  * Detect the LVDS connection.
 504  *
 505  * This always returns CONNECTOR_STATUS_CONNECTED.
 506  * This connector should only have
 507  * been set up if the LVDS was actually connected anyway.
 508  */
 509 static enum drm_connector_status psb_intel_lvds_detect(struct drm_connector
 510                                                    *connector, bool force)
 511 {
 512         return connector_status_connected;
 513 }
 514
 515 /*
 516  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 517  */
 518 static int psb_intel_lvds_get_modes(struct drm_connector *connector)
 519 {
 520         struct drm_device *dev = connector->dev;
 521         struct drm_psb_private *dev_priv = dev->dev_private;
 522         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 523         struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 524         struct psb_intel_lvds_priv *lvds_priv = gma_encoder->dev_priv;
 525         int ret = 0;
 526
 527         if (!IS_MRST(dev))
 528                 ret = psb_intel_ddc_get_modes(connector, &lvds_priv->i2c_bus->adapter);
 529
 530         if (ret)
 531                 return ret;
 532
 533         if (mode_dev->panel_fixed_mode != NULL) {
 534                 struct drm_display_mode *mode =
 535                     drm_mode_duplicate(dev, mode_dev->panel_fixed_mode);
 536                 drm_mode_probed_add(connector, mode);
 537                 return 1;
 538         }
 539
 540         return 0;
 541 }
 542
 543 /**
 544  * psb_intel_lvds_destroy - unregister and free LVDS structures
 545  * @connector: connector to free
 546  *
 547  * Unregister the DDC bus for this connector then free the driver private
 548  * structure.
 549  */
 550 void psb_intel_lvds_destroy(struct drm_connector *connector)
 551 {
 552         struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 553         struct psb_intel_lvds_priv *lvds_priv = gma_encoder->dev_priv;
 554
 555         psb_intel_i2c_destroy(lvds_priv->ddc_bus);
 556         drm_connector_unregister(connector);
 557         drm_connector_cleanup(connector);
 558         kfree(connector);
 559 }
 560
 561 int psb_intel_lvds_set_property(struct drm_connector *connector,
 562                                        struct drm_property *property,
 563                                        uint64_t value)
 564 {
 565         struct drm_encoder *encoder = connector->encoder;
 566
 567         if (!encoder)
 568                 return -1;
 569
 570         if (!strcmp(property->name, "scaling mode")) {
 571                 struct gma_crtc *crtc = to_gma_crtc(encoder->crtc);
 572                 uint64_t curval;
 573
 574                 if (!crtc)
 575                         goto set_prop_error;
 576
 577                 switch (value) {
 578                 case DRM_MODE_SCALE_FULLSCREEN:
 579                         break;
 580                 case DRM_MODE_SCALE_NO_SCALE:
 581                         break;
 582                 case DRM_MODE_SCALE_ASPECT:
 583                         break;
 584                 default:
 585                         goto set_prop_error;
 586                 }
 587
 588                 if (drm_object_property_get_value(&connector->base,
 589                                                      property,
 590                                                      &curval))
 591                         goto set_prop_error;
 592
 593                 if (curval == value)
 594                         goto set_prop_done;
 595
 596                 if (drm_object_property_set_value(&connector->base,
 597                                                         property,
 598                                                         value))
 599                         goto set_prop_error;
 600
 601                 if (crtc->saved_mode.hdisplay != 0 &&
 602                     crtc->saved_mode.vdisplay != 0) {
 603                         if (!drm_crtc_helper_set_mode(encoder->crtc,
 604                                                       &crtc->saved_mode,
 605                                                       encoder->crtc->x,
 606                                                       encoder->crtc->y,
 607                                                       encoder->crtc->primary->fb))
 608                                 goto set_prop_error;
 609                 }
 610         } else if (!strcmp(property->name, "backlight")) {
 611                 if (drm_object_property_set_value(&connector->base,
 612                                                         property,
 613                                                         value))
 614                         goto set_prop_error;
 615                 else
 616                         gma_backlight_set(encoder->dev, value);
 617         } else if (!strcmp(property->name, "DPMS")) {
 618                 const struct drm_encoder_helper_funcs *hfuncs
 619                                                 = encoder->helper_private;
 620                 hfuncs->dpms(encoder, value);
 621         }
 622
 623 set_prop_done:
 624         return 0;
 625 set_prop_error:
 626         return -1;
 627 }
 628
 629 static const struct drm_encoder_helper_funcs psb_intel_lvds_helper_funcs = {
 630         .dpms = psb_intel_lvds_encoder_dpms,
 631         .mode_fixup = psb_intel_lvds_mode_fixup,
 632         .prepare = psb_intel_lvds_prepare,
 633         .mode_set = psb_intel_lvds_mode_set,
 634         .commit = psb_intel_lvds_commit,
 635 };
 636
 637 const struct drm_connector_helper_funcs
 638                                 psb_intel_lvds_connector_helper_funcs = {
 639         .get_modes = psb_intel_lvds_get_modes,
 640         .mode_valid = psb_intel_lvds_mode_valid,
 641         .best_encoder = gma_best_encoder,
 642 };
 643
 644 const struct drm_connector_funcs psb_intel_lvds_connector_funcs = {
 645         .dpms = drm_helper_connector_dpms,
 646         .detect = psb_intel_lvds_detect,
 647         .fill_modes = drm_helper_probe_single_connector_modes,
 648         .set_property = psb_intel_lvds_set_property,
 649         .destroy = psb_intel_lvds_destroy,
 650 };
 651
 652
 653 static void psb_intel_lvds_enc_destroy(struct drm_encoder *encoder)
 654 {
 655         drm_encoder_cleanup(encoder);
 656 }
 657
 658 const struct drm_encoder_funcs psb_intel_lvds_enc_funcs = {
 659         .destroy = psb_intel_lvds_enc_destroy,
 660 };
 661
 662
 663
 664 /**
 665  * psb_intel_lvds_init - setup LVDS connectors on this device
 666  * @dev: drm device
 667  *
 668  * Create the connector, register the LVDS DDC bus, and try to figure out what
 669  * modes we can display on the LVDS panel (if present).
 670  */
 671 void psb_intel_lvds_init(struct drm_device *dev,
 672                          struct psb_intel_mode_device *mode_dev)
 673 {
 674         struct gma_encoder *gma_encoder;
 675         struct gma_connector *gma_connector;
 676         struct psb_intel_lvds_priv *lvds_priv;
 677         struct drm_connector *connector;
 678         struct drm_encoder *encoder;
 679         struct drm_display_mode *scan;  /* *modes, *bios_mode; */
 680         struct drm_crtc *crtc;
 681         struct drm_psb_private *dev_priv = dev->dev_private;
 682         u32 lvds;
 683         int pipe;
 684
 685         gma_encoder = kzalloc(sizeof(struct gma_encoder), GFP_KERNEL);
 686         if (!gma_encoder) {
 687                 dev_err(dev->dev, "gma_encoder allocation error\n");
 688                 return;
 689         }
 690
 691         gma_connector = kzalloc(sizeof(struct gma_connector), GFP_KERNEL);
 692         if (!gma_connector) {
 693                 dev_err(dev->dev, "gma_connector allocation error\n");
 694                 goto failed_encoder;
 695         }
 696
 697         lvds_priv = kzalloc(sizeof(struct psb_intel_lvds_priv), GFP_KERNEL);
 698         if (!lvds_priv) {
 699                 dev_err(dev->dev, "LVDS private allocation error\n");
 700                 goto failed_connector;
 701         }
 702
 703         gma_encoder->dev_priv = lvds_priv;
 704
 705         connector = &gma_connector->base;
 706         gma_connector->save = psb_intel_lvds_save;
 707         gma_connector->restore = psb_intel_lvds_restore;
 708
 709         encoder = &gma_encoder->base;
 710         drm_connector_init(dev, connector,
 711                            &psb_intel_lvds_connector_funcs,
 712                            DRM_MODE_CONNECTOR_LVDS);
 713
 714         drm_encoder_init(dev, encoder,
 715                          &psb_intel_lvds_enc_funcs,
 716                          DRM_MODE_ENCODER_LVDS, NULL);
 717
 718         gma_connector_attach_encoder(gma_connector, gma_encoder);
 719         gma_encoder->type = INTEL_OUTPUT_LVDS;
 720
 721         drm_encoder_helper_add(encoder, &psb_intel_lvds_helper_funcs);
 722         drm_connector_helper_add(connector,
 723                                  &psb_intel_lvds_connector_helper_funcs);
 724         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 725         connector->interlace_allowed = false;
 726         connector->doublescan_allowed = false;
 727
 728         /*Attach connector properties*/
 729         drm_object_attach_property(&connector->base,
 730                                       dev->mode_config.scaling_mode_property,
 731                                       DRM_MODE_SCALE_FULLSCREEN);
 732         drm_object_attach_property(&connector->base,
 733                                       dev_priv->backlight_property,
 734                                       BRIGHTNESS_MAX_LEVEL);
 735
 736         /*
 737          * Set up I2C bus
 738          * FIXME: distroy i2c_bus when exit
 739          */
 740         lvds_priv->i2c_bus = psb_intel_i2c_create(dev, GPIOB, "LVDSBLC_B");
 741         if (!lvds_priv->i2c_bus) {
 742                 dev_printk(KERN_ERR,
 743                         &dev->pdev->dev, "I2C bus registration failed.\n");
 744                 goto failed_blc_i2c;
 745         }
 746         lvds_priv->i2c_bus->slave_addr = 0x2C;
 747         dev_priv->lvds_i2c_bus =  lvds_priv->i2c_bus;
 748
 749         /*
 750          * LVDS discovery:
 751          * 1) check for EDID on DDC
 752          * 2) check for VBT data
 753          * 3) check to see if LVDS is already on
 754          *    if none of the above, no panel
 755          * 4) make sure lid is open
 756          *    if closed, act like it's not there for now
 757          */
 758
 759         /* Set up the DDC bus. */
 760         lvds_priv->ddc_bus = psb_intel_i2c_create(dev, GPIOC, "LVDSDDC_C");
 761         if (!lvds_priv->ddc_bus) {
 762                 dev_printk(KERN_ERR, &dev->pdev->dev,
 763                            "DDC bus registration " "failed.\n");
 764                 goto failed_ddc;
 765         }
 766
 767         /*
 768          * Attempt to get the fixed panel mode from DDC.  Assume that the
 769          * preferred mode is the right one.
 770          */
 771         mutex_lock(&dev->mode_config.mutex);
 772         psb_intel_ddc_get_modes(connector, &lvds_priv->ddc_bus->adapter);
 773         list_for_each_entry(scan, &connector->probed_modes, head) {
 774                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
 775                         mode_dev->panel_fixed_mode =
 776                             drm_mode_duplicate(dev, scan);
 777                         goto out;       /* FIXME: check for quirks */
 778                 }
 779         }
 780
 781         /* Failed to get EDID, what about VBT? do we need this? */
 782         if (mode_dev->vbt_mode)
 783                 mode_dev->panel_fixed_mode =
 784                     drm_mode_duplicate(dev, mode_dev->vbt_mode);
 785
 786         if (!mode_dev->panel_fixed_mode)
 787                 if (dev_priv->lfp_lvds_vbt_mode)
 788                         mode_dev->panel_fixed_mode =
 789                                 drm_mode_duplicate(dev,
 790                                         dev_priv->lfp_lvds_vbt_mode);
 791
 792         /*
 793          * If we didn't get EDID, try checking if the panel is already turned
 794          * on.  If so, assume that whatever is currently programmed is the
 795          * correct mode.
 796          */
 797         lvds = REG_READ(LVDS);
 798         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
 799         crtc = psb_intel_get_crtc_from_pipe(dev, pipe);
 800
 801         if (crtc && (lvds & LVDS_PORT_EN)) {
 802                 mode_dev->panel_fixed_mode =
 803                     psb_intel_crtc_mode_get(dev, crtc);
 804                 if (mode_dev->panel_fixed_mode) {
 805                         mode_dev->panel_fixed_mode->type |=
 806                             DRM_MODE_TYPE_PREFERRED;
 807                         goto out;       /* FIXME: check for quirks */
 808                 }
 809         }
 810
 811         /* If we still don't have a mode after all that, give up. */
 812         if (!mode_dev->panel_fixed_mode) {
 813                 dev_err(dev->dev, "Found no modes on the lvds, ignoring the LVDS\n");
 814                 goto failed_find;
 815         }
 816
 817         /*
 818          * Blacklist machines with BIOSes that list an LVDS panel without
 819          * actually having one.
 820          */
 821 out:
 822         mutex_unlock(&dev->mode_config.mutex);
 823         drm_connector_register(connector);
 824         return;
 825
 826 failed_find:
 827         mutex_unlock(&dev->mode_config.mutex);
 828         psb_intel_i2c_destroy(lvds_priv->ddc_bus);
 829 failed_ddc:
 830         psb_intel_i2c_destroy(lvds_priv->i2c_bus);
 831 failed_blc_i2c:
 832         drm_encoder_cleanup(encoder);
 833         drm_connector_cleanup(connector);
 834 failed_connector:
 835         kfree(gma_connector);
 836 failed_encoder:
 837         kfree(gma_encoder);
 838 }
 839