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 <linux/i2c.h>
  31 #include "drmP.h"
  32 #include "drm.h"
  33 #include "drm_crtc.h"
  34 #include "drm_edid.h"
  35 #include "intel_drv.h"
  36 #include "i915_drm.h"
  37 #include "i915_drv.h"
  38
  39 /**
  40  * Sets the backlight level.
  41  *
  42  * \param level backlight level, from 0 to intel_lvds_get_max_backlight().
  43  */
  44 static void intel_lvds_set_backlight(struct drm_device *dev, int level)
  45 {
  46         struct drm_i915_private *dev_priv = dev->dev_private;
  47         u32 blc_pwm_ctl;
  48
  49         blc_pwm_ctl = I915_READ(BLC_PWM_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
  50         I915_WRITE(BLC_PWM_CTL, (blc_pwm_ctl |
  51                                  (level << BACKLIGHT_DUTY_CYCLE_SHIFT)));
  52 }
  53
  54 /**
  55  * Returns the maximum level of the backlight duty cycle field.
  56  */
  57 static u32 intel_lvds_get_max_backlight(struct drm_device *dev)
  58 {
  59         struct drm_i915_private *dev_priv = dev->dev_private;
  60
  61         return ((I915_READ(BLC_PWM_CTL) & BACKLIGHT_MODULATION_FREQ_MASK) >>
  62                 BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
  63 }
  64
  65 /**
  66  * Sets the power state for the panel.
  67  */
  68 static void intel_lvds_set_power(struct drm_device *dev, bool on)
  69 {
  70         struct drm_i915_private *dev_priv = dev->dev_private;
  71         u32 pp_status;
  72
  73         if (on) {
  74                 I915_WRITE(PP_CONTROL, I915_READ(PP_CONTROL) |
  75                            POWER_TARGET_ON);
  76                 do {
  77                         pp_status = I915_READ(PP_STATUS);
  78                 } while ((pp_status & PP_ON) == 0);
  79
  80                 intel_lvds_set_backlight(dev, dev_priv->backlight_duty_cycle);
  81         } else {
  82                 intel_lvds_set_backlight(dev, 0);
  83
  84                 I915_WRITE(PP_CONTROL, I915_READ(PP_CONTROL) &
  85                            ~POWER_TARGET_ON);
  86                 do {
  87                         pp_status = I915_READ(PP_STATUS);
  88                 } while (pp_status & PP_ON);
  89         }
  90 }
  91
  92 static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)
  93 {
  94         struct drm_device *dev = encoder->dev;
  95
  96         if (mode == DRM_MODE_DPMS_ON)
  97                 intel_lvds_set_power(dev, true);
  98         else
  99                 intel_lvds_set_power(dev, false);
 100
 101         /* XXX: We never power down the LVDS pairs. */
 102 }
 103
 104 static void intel_lvds_save(struct drm_connector *connector)
 105 {
 106         struct drm_device *dev = connector->dev;
 107         struct drm_i915_private *dev_priv = dev->dev_private;
 108
 109         dev_priv->savePP_ON = I915_READ(PP_ON_DELAYS);
 110         dev_priv->savePP_OFF = I915_READ(PP_OFF_DELAYS);
 111         dev_priv->savePP_CONTROL = I915_READ(PP_CONTROL);
 112         dev_priv->savePP_DIVISOR = I915_READ(PP_DIVISOR);
 113         dev_priv->saveBLC_PWM_CTL = I915_READ(BLC_PWM_CTL);
 114         dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
 115                                        BACKLIGHT_DUTY_CYCLE_MASK);
 116
 117         /*
 118          * If the light is off at server startup, just make it full brightness
 119          */
 120         if (dev_priv->backlight_duty_cycle == 0)
 121                 dev_priv->backlight_duty_cycle =
 122                         intel_lvds_get_max_backlight(dev);
 123 }
 124
 125 static void intel_lvds_restore(struct drm_connector *connector)
 126 {
 127         struct drm_device *dev = connector->dev;
 128         struct drm_i915_private *dev_priv = dev->dev_private;
 129
 130         I915_WRITE(BLC_PWM_CTL, dev_priv->saveBLC_PWM_CTL);
 131         I915_WRITE(PP_ON_DELAYS, dev_priv->savePP_ON);
 132         I915_WRITE(PP_OFF_DELAYS, dev_priv->savePP_OFF);
 133         I915_WRITE(PP_DIVISOR, dev_priv->savePP_DIVISOR);
 134         I915_WRITE(PP_CONTROL, dev_priv->savePP_CONTROL);
 135         if (dev_priv->savePP_CONTROL & POWER_TARGET_ON)
 136                 intel_lvds_set_power(dev, true);
 137         else
 138                 intel_lvds_set_power(dev, false);
 139 }
 140
 141 static int intel_lvds_mode_valid(struct drm_connector *connector,
 142                                  struct drm_display_mode *mode)
 143 {
 144         struct drm_device *dev = connector->dev;
 145         struct drm_i915_private *dev_priv = dev->dev_private;
 146         struct drm_display_mode *fixed_mode = dev_priv->panel_fixed_mode;
 147
 148         if (fixed_mode) {
 149                 if (mode->hdisplay > fixed_mode->hdisplay)
 150                         return MODE_PANEL;
 151                 if (mode->vdisplay > fixed_mode->vdisplay)
 152                         return MODE_PANEL;
 153         }
 154
 155         return MODE_OK;
 156 }
 157
 158 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
 159                                   struct drm_display_mode *mode,
 160                                   struct drm_display_mode *adjusted_mode)
 161 {
 162         struct drm_device *dev = encoder->dev;
 163         struct drm_i915_private *dev_priv = dev->dev_private;
 164         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
 165         struct drm_encoder *tmp_encoder;
 166
 167         /* Should never happen!! */
 168         if (!IS_I965G(dev) && intel_crtc->pipe == 0) {
 169                 printk(KERN_ERR "Can't support LVDS on pipe A\n");
 170                 return false;
 171         }
 172
 173         /* Should never happen!! */
 174         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, head) {
 175                 if (tmp_encoder != encoder && tmp_encoder->crtc == encoder->crtc) {
 176                         printk(KERN_ERR "Can't enable LVDS and another "
 177                                "encoder on the same pipe\n");
 178                         return false;
 179                 }
 180         }
 181
 182         /*
 183          * If we have timings from the BIOS for the panel, put them in
 184          * to the adjusted mode.  The CRTC will be set up for this mode,
 185          * with the panel scaling set up to source from the H/VDisplay
 186          * of the original mode.
 187          */
 188         if (dev_priv->panel_fixed_mode != NULL) {
 189                 adjusted_mode->hdisplay = dev_priv->panel_fixed_mode->hdisplay;
 190                 adjusted_mode->hsync_start =
 191                         dev_priv->panel_fixed_mode->hsync_start;
 192                 adjusted_mode->hsync_end =
 193                         dev_priv->panel_fixed_mode->hsync_end;
 194                 adjusted_mode->htotal = dev_priv->panel_fixed_mode->htotal;
 195                 adjusted_mode->vdisplay = dev_priv->panel_fixed_mode->vdisplay;
 196                 adjusted_mode->vsync_start =
 197                         dev_priv->panel_fixed_mode->vsync_start;
 198                 adjusted_mode->vsync_end =
 199                         dev_priv->panel_fixed_mode->vsync_end;
 200                 adjusted_mode->vtotal = dev_priv->panel_fixed_mode->vtotal;
 201                 adjusted_mode->clock = dev_priv->panel_fixed_mode->clock;
 202                 drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);
 203         }
 204
 205         /*
 206          * XXX: It would be nice to support lower refresh rates on the
 207          * panels to reduce power consumption, and perhaps match the
 208          * user's requested refresh rate.
 209          */
 210
 211         return true;
 212 }
 213
 214 static void intel_lvds_prepare(struct drm_encoder *encoder)
 215 {
 216         struct drm_device *dev = encoder->dev;
 217         struct drm_i915_private *dev_priv = dev->dev_private;
 218
 219         dev_priv->saveBLC_PWM_CTL = I915_READ(BLC_PWM_CTL);
 220         dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
 221                                        BACKLIGHT_DUTY_CYCLE_MASK);
 222
 223         intel_lvds_set_power(dev, false);
 224 }
 225
 226 static void intel_lvds_commit( struct drm_encoder *encoder)
 227 {
 228         struct drm_device *dev = encoder->dev;
 229         struct drm_i915_private *dev_priv = dev->dev_private;
 230
 231         if (dev_priv->backlight_duty_cycle == 0)
 232                 dev_priv->backlight_duty_cycle =
 233                         intel_lvds_get_max_backlight(dev);
 234
 235         intel_lvds_set_power(dev, true);
 236 }
 237
 238 static void intel_lvds_mode_set(struct drm_encoder *encoder,
 239                                 struct drm_display_mode *mode,
 240                                 struct drm_display_mode *adjusted_mode)
 241 {
 242         struct drm_device *dev = encoder->dev;
 243         struct drm_i915_private *dev_priv = dev->dev_private;
 244         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
 245         u32 pfit_control;
 246
 247         /*
 248          * The LVDS pin pair will already have been turned on in the
 249          * intel_crtc_mode_set since it has a large impact on the DPLL
 250          * settings.
 251          */
 252
 253         /*
 254          * Enable automatic panel scaling so that non-native modes fill the
 255          * screen.  Should be enabled before the pipe is enabled, according to
 256          * register description and PRM.
 257          */
 258         if (mode->hdisplay != adjusted_mode->hdisplay ||
 259             mode->vdisplay != adjusted_mode->vdisplay)
 260                 pfit_control = (PFIT_ENABLE | VERT_AUTO_SCALE |
 261                                 HORIZ_AUTO_SCALE | VERT_INTERP_BILINEAR |
 262                                 HORIZ_INTERP_BILINEAR);
 263         else
 264                 pfit_control = 0;
 265
 266         if (!IS_I965G(dev)) {
 267                 if (dev_priv->panel_wants_dither)
 268                         pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 269         }
 270         else
 271                 pfit_control |= intel_crtc->pipe << PFIT_PIPE_SHIFT;
 272
 273         I915_WRITE(PFIT_CONTROL, pfit_control);
 274 }
 275
 276 /**
 277  * Detect the LVDS connection.
 278  *
 279  * This always returns CONNECTOR_STATUS_CONNECTED.  This connector should only have
 280  * been set up if the LVDS was actually connected anyway.
 281  */
 282 static enum drm_connector_status intel_lvds_detect(struct drm_connector *connector)
 283 {
 284         return connector_status_connected;
 285 }
 286
 287 /**
 288  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 289  */
 290 static int intel_lvds_get_modes(struct drm_connector *connector)
 291 {
 292         struct drm_device *dev = connector->dev;
 293         struct intel_output *intel_output = to_intel_output(connector);
 294         struct drm_i915_private *dev_priv = dev->dev_private;
 295         int ret = 0;
 296
 297         ret = intel_ddc_get_modes(intel_output);
 298
 299         if (ret)
 300                 return ret;
 301
 302         /* Didn't get an EDID, so
 303          * Set wide sync ranges so we get all modes
 304          * handed to valid_mode for checking
 305          */
 306         connector->display_info.min_vfreq = 0;
 307         connector->display_info.max_vfreq = 200;
 308         connector->display_info.min_hfreq = 0;
 309         connector->display_info.max_hfreq = 200;
 310
 311         if (dev_priv->panel_fixed_mode != NULL) {
 312                 struct drm_display_mode *mode;
 313
 314                 mutex_unlock(&dev->mode_config.mutex);
 315                 mode = drm_mode_duplicate(dev, dev_priv->panel_fixed_mode);
 316                 drm_mode_probed_add(connector, mode);
 317                 mutex_unlock(&dev->mode_config.mutex);
 318
 319                 return 1;
 320         }
 321
 322         return 0;
 323 }
 324
 325 /**
 326  * intel_lvds_destroy - unregister and free LVDS structures
 327  * @connector: connector to free
 328  *
 329  * Unregister the DDC bus for this connector then free the driver private
 330  * structure.
 331  */
 332 static void intel_lvds_destroy(struct drm_connector *connector)
 333 {
 334         struct intel_output *intel_output = to_intel_output(connector);
 335
 336         if (intel_output->ddc_bus)
 337                 intel_i2c_destroy(intel_output->ddc_bus);
 338         drm_sysfs_connector_remove(connector);
 339         drm_connector_cleanup(connector);
 340         kfree(connector);
 341 }
 342
 343 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
 344         .dpms = intel_lvds_dpms,
 345         .mode_fixup = intel_lvds_mode_fixup,
 346         .prepare = intel_lvds_prepare,
 347         .mode_set = intel_lvds_mode_set,
 348         .commit = intel_lvds_commit,
 349 };
 350
 351 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 352         .get_modes = intel_lvds_get_modes,
 353         .mode_valid = intel_lvds_mode_valid,
 354         .best_encoder = intel_best_encoder,
 355 };
 356
 357 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 358         .save = intel_lvds_save,
 359         .restore = intel_lvds_restore,
 360         .detect = intel_lvds_detect,
 361         .fill_modes = drm_helper_probe_single_connector_modes,
 362         .destroy = intel_lvds_destroy,
 363 };
 364
 365
 366 static void intel_lvds_enc_destroy(struct drm_encoder *encoder)
 367 {
 368         drm_encoder_cleanup(encoder);
 369 }
 370
 371 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 372         .destroy = intel_lvds_enc_destroy,
 373 };
 374
 375
 376
 377 /**
 378  * intel_lvds_init - setup LVDS connectors on this device
 379  * @dev: drm device
 380  *
 381  * Create the connector, register the LVDS DDC bus, and try to figure out what
 382  * modes we can display on the LVDS panel (if present).
 383  */
 384 void intel_lvds_init(struct drm_device *dev)
 385 {
 386         struct drm_i915_private *dev_priv = dev->dev_private;
 387         struct intel_output *intel_output;
 388         struct drm_connector *connector;
 389         struct drm_encoder *encoder;
 390         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 391         struct drm_crtc *crtc;
 392         u32 lvds;
 393         int pipe;
 394
 395         intel_output = kzalloc(sizeof(struct intel_output), GFP_KERNEL);
 396         if (!intel_output) {
 397                 return;
 398         }
 399
 400         connector = &intel_output->base;
 401         encoder = &intel_output->enc;
 402         drm_connector_init(dev, &intel_output->base, &intel_lvds_connector_funcs,
 403                            DRM_MODE_CONNECTOR_LVDS);
 404
 405         drm_encoder_init(dev, &intel_output->enc, &intel_lvds_enc_funcs,
 406                          DRM_MODE_ENCODER_LVDS);
 407
 408         drm_mode_connector_attach_encoder(&intel_output->base, &intel_output->enc);
 409         intel_output->type = INTEL_OUTPUT_LVDS;
 410
 411         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
 412         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
 413         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 414         connector->interlace_allowed = false;
 415         connector->doublescan_allowed = false;
 416
 417
 418         /*
 419          * LVDS discovery:
 420          * 1) check for EDID on DDC
 421          * 2) check for VBT data
 422          * 3) check to see if LVDS is already on
 423          *    if none of the above, no panel
 424          * 4) make sure lid is open
 425          *    if closed, act like it's not there for now
 426          */
 427
 428         /* Set up the DDC bus. */
 429         intel_output->ddc_bus = intel_i2c_create(dev, GPIOC, "LVDSDDC_C");
 430         if (!intel_output->ddc_bus) {
 431                 dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
 432                            "failed.\n");
 433                 goto failed;
 434         }
 435
 436         /*
 437          * Attempt to get the fixed panel mode from DDC.  Assume that the
 438          * preferred mode is the right one.
 439          */
 440         intel_ddc_get_modes(intel_output);
 441
 442         list_for_each_entry(scan, &connector->probed_modes, head) {
 443                 mutex_lock(&dev->mode_config.mutex);
 444                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
 445                         dev_priv->panel_fixed_mode =
 446                                 drm_mode_duplicate(dev, scan);
 447                         mutex_unlock(&dev->mode_config.mutex);
 448                         goto out; /* FIXME: check for quirks */
 449                 }
 450                 mutex_unlock(&dev->mode_config.mutex);
 451         }
 452
 453         /* Failed to get EDID, what about VBT? */
 454         if (dev_priv->vbt_mode) {
 455                 mutex_lock(&dev->mode_config.mutex);
 456                 dev_priv->panel_fixed_mode =
 457                         drm_mode_duplicate(dev, dev_priv->vbt_mode);
 458                 mutex_unlock(&dev->mode_config.mutex);
 459                 if (dev_priv->panel_fixed_mode) {
 460                         dev_priv->panel_fixed_mode->type |=
 461                                 DRM_MODE_TYPE_PREFERRED;
 462                         drm_mode_probed_add(connector,
 463                                             dev_priv->panel_fixed_mode);
 464                         goto out;
 465                 }
 466         }
 467
 468         /*
 469          * If we didn't get EDID, try checking if the panel is already turned
 470          * on.  If so, assume that whatever is currently programmed is the
 471          * correct mode.
 472          */
 473         lvds = I915_READ(LVDS);
 474         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
 475         crtc = intel_get_crtc_from_pipe(dev, pipe);
 476
 477         if (crtc && (lvds & LVDS_PORT_EN)) {
 478                 dev_priv->panel_fixed_mode = intel_crtc_mode_get(dev, crtc);
 479                 if (dev_priv->panel_fixed_mode) {
 480                         dev_priv->panel_fixed_mode->type |=
 481                                 DRM_MODE_TYPE_PREFERRED;
 482                         goto out; /* FIXME: check for quirks */
 483                 }
 484         }
 485
 486         /* If we still don't have a mode after all that, give up. */
 487         if (!dev_priv->panel_fixed_mode)
 488                 goto failed;
 489
 490         /* FIXME: detect aopen & mac mini type stuff automatically? */
 491         /*
 492          * Blacklist machines with BIOSes that list an LVDS panel without
 493          * actually having one.
 494          */
 495         if (IS_I945GM(dev)) {
 496                 /* aopen mini pc */
 497                 if (dev->pdev->subsystem_vendor == 0xa0a0)
 498                         goto failed;
 499
 500                 if ((dev->pdev->subsystem_vendor == 0x8086) &&
 501                     (dev->pdev->subsystem_device == 0x7270)) {
 502                         /* It's a Mac Mini or Macbook Pro.
 503                          *
 504                          * Apple hardware is out to get us.  The macbook pro
 505                          * has a real LVDS panel, but the mac mini does not,
 506                          * and they have the same device IDs.  We'll
 507                          * distinguish by panel size, on the assumption
 508                          * that Apple isn't about to make any machines with an
 509                          * 800x600 display.
 510                          */
 511
 512                         if (dev_priv->panel_fixed_mode != NULL &&
 513                             dev_priv->panel_fixed_mode->hdisplay == 800 &&
 514                             dev_priv->panel_fixed_mode->vdisplay == 600) {
 515                                 DRM_DEBUG("Suspected Mac Mini, ignoring the LVDS\n");
 516                                 goto failed;
 517                         }
 518                 }
 519         }
 520
 521
 522 out:
 523         drm_sysfs_connector_add(connector);
 524         return;
 525
 526 failed:
 527         DRM_DEBUG("No LVDS modes found, disabling.\n");
 528         if (intel_output->ddc_bus)
 529                 intel_i2c_destroy(intel_output->ddc_bus);
 530         drm_connector_cleanup(connector);
 531         kfree(connector);
 532 }