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/dmi.h>
  31 #include <linux/i2c.h>
  32 #include "drmP.h"
  33 #include "drm.h"
  34 #include "drm_crtc.h"
  35 #include "drm_edid.h"
  36 #include "intel_drv.h"
  37 #include "i915_drm.h"
  38 #include "i915_drv.h"
  39
  40 /**
  41  * Sets the backlight level.
  42  *
  43  * \param level backlight level, from 0 to intel_lvds_get_max_backlight().
  44  */
  45 static void intel_lvds_set_backlight(struct drm_device *dev, int level)
  46 {
  47         struct drm_i915_private *dev_priv = dev->dev_private;
  48         u32 blc_pwm_ctl;
  49
  50         blc_pwm_ctl = I915_READ(BLC_PWM_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
  51         I915_WRITE(BLC_PWM_CTL, (blc_pwm_ctl |
  52                                  (level << BACKLIGHT_DUTY_CYCLE_SHIFT)));
  53 }
  54
  55 /**
  56  * Returns the maximum level of the backlight duty cycle field.
  57  */
  58 static u32 intel_lvds_get_max_backlight(struct drm_device *dev)
  59 {
  60         struct drm_i915_private *dev_priv = dev->dev_private;
  61
  62         return ((I915_READ(BLC_PWM_CTL) & BACKLIGHT_MODULATION_FREQ_MASK) >>
  63                 BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
  64 }
  65
  66 /**
  67  * Sets the power state for the panel.
  68  */
  69 static void intel_lvds_set_power(struct drm_device *dev, bool on)
  70 {
  71         struct drm_i915_private *dev_priv = dev->dev_private;
  72         u32 pp_status;
  73
  74         if (on) {
  75                 I915_WRITE(PP_CONTROL, I915_READ(PP_CONTROL) |
  76                            POWER_TARGET_ON);
  77                 do {
  78                         pp_status = I915_READ(PP_STATUS);
  79                 } while ((pp_status & PP_ON) == 0);
  80
  81                 intel_lvds_set_backlight(dev, dev_priv->backlight_duty_cycle);
  82         } else {
  83                 intel_lvds_set_backlight(dev, 0);
  84
  85                 I915_WRITE(PP_CONTROL, I915_READ(PP_CONTROL) &
  86                            ~POWER_TARGET_ON);
  87                 do {
  88                         pp_status = I915_READ(PP_STATUS);
  89                 } while (pp_status & PP_ON);
  90         }
  91 }
  92
  93 static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)
  94 {
  95         struct drm_device *dev = encoder->dev;
  96
  97         if (mode == DRM_MODE_DPMS_ON)
  98                 intel_lvds_set_power(dev, true);
  99         else
 100                 intel_lvds_set_power(dev, false);
 101
 102         /* XXX: We never power down the LVDS pairs. */
 103 }
 104
 105 static void intel_lvds_save(struct drm_connector *connector)
 106 {
 107         struct drm_device *dev = connector->dev;
 108         struct drm_i915_private *dev_priv = dev->dev_private;
 109
 110         dev_priv->savePP_ON = I915_READ(PP_ON_DELAYS);
 111         dev_priv->savePP_OFF = I915_READ(PP_OFF_DELAYS);
 112         dev_priv->savePP_CONTROL = I915_READ(PP_CONTROL);
 113         dev_priv->savePP_DIVISOR = I915_READ(PP_DIVISOR);
 114         dev_priv->saveBLC_PWM_CTL = I915_READ(BLC_PWM_CTL);
 115         dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
 116                                        BACKLIGHT_DUTY_CYCLE_MASK);
 117
 118         /*
 119          * If the light is off at server startup, just make it full brightness
 120          */
 121         if (dev_priv->backlight_duty_cycle == 0)
 122                 dev_priv->backlight_duty_cycle =
 123                         intel_lvds_get_max_backlight(dev);
 124 }
 125
 126 static void intel_lvds_restore(struct drm_connector *connector)
 127 {
 128         struct drm_device *dev = connector->dev;
 129         struct drm_i915_private *dev_priv = dev->dev_private;
 130
 131         I915_WRITE(BLC_PWM_CTL, dev_priv->saveBLC_PWM_CTL);
 132         I915_WRITE(PP_ON_DELAYS, dev_priv->savePP_ON);
 133         I915_WRITE(PP_OFF_DELAYS, dev_priv->savePP_OFF);
 134         I915_WRITE(PP_DIVISOR, dev_priv->savePP_DIVISOR);
 135         I915_WRITE(PP_CONTROL, dev_priv->savePP_CONTROL);
 136         if (dev_priv->savePP_CONTROL & POWER_TARGET_ON)
 137                 intel_lvds_set_power(dev, true);
 138         else
 139                 intel_lvds_set_power(dev, false);
 140 }
 141
 142 static int intel_lvds_mode_valid(struct drm_connector *connector,
 143                                  struct drm_display_mode *mode)
 144 {
 145         struct drm_device *dev = connector->dev;
 146         struct drm_i915_private *dev_priv = dev->dev_private;
 147         struct drm_display_mode *fixed_mode = dev_priv->panel_fixed_mode;
 148
 149         if (fixed_mode) {
 150                 if (mode->hdisplay > fixed_mode->hdisplay)
 151                         return MODE_PANEL;
 152                 if (mode->vdisplay > fixed_mode->vdisplay)
 153                         return MODE_PANEL;
 154         }
 155
 156         return MODE_OK;
 157 }
 158
 159 static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
 160                                   struct drm_display_mode *mode,
 161                                   struct drm_display_mode *adjusted_mode)
 162 {
 163         struct drm_device *dev = encoder->dev;
 164         struct drm_i915_private *dev_priv = dev->dev_private;
 165         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
 166         struct drm_encoder *tmp_encoder;
 167
 168         /* Should never happen!! */
 169         if (!IS_I965G(dev) && intel_crtc->pipe == 0) {
 170                 printk(KERN_ERR "Can't support LVDS on pipe A\n");
 171                 return false;
 172         }
 173
 174         /* Should never happen!! */
 175         list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, head) {
 176                 if (tmp_encoder != encoder && tmp_encoder->crtc == encoder->crtc) {
 177                         printk(KERN_ERR "Can't enable LVDS and another "
 178                                "encoder on the same pipe\n");
 179                         return false;
 180                 }
 181         }
 182
 183         /*
 184          * If we have timings from the BIOS for the panel, put them in
 185          * to the adjusted mode.  The CRTC will be set up for this mode,
 186          * with the panel scaling set up to source from the H/VDisplay
 187          * of the original mode.
 188          */
 189         if (dev_priv->panel_fixed_mode != NULL) {
 190                 adjusted_mode->hdisplay = dev_priv->panel_fixed_mode->hdisplay;
 191                 adjusted_mode->hsync_start =
 192                         dev_priv->panel_fixed_mode->hsync_start;
 193                 adjusted_mode->hsync_end =
 194                         dev_priv->panel_fixed_mode->hsync_end;
 195                 adjusted_mode->htotal = dev_priv->panel_fixed_mode->htotal;
 196                 adjusted_mode->vdisplay = dev_priv->panel_fixed_mode->vdisplay;
 197                 adjusted_mode->vsync_start =
 198                         dev_priv->panel_fixed_mode->vsync_start;
 199                 adjusted_mode->vsync_end =
 200                         dev_priv->panel_fixed_mode->vsync_end;
 201                 adjusted_mode->vtotal = dev_priv->panel_fixed_mode->vtotal;
 202                 adjusted_mode->clock = dev_priv->panel_fixed_mode->clock;
 203                 drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);
 204         }
 205
 206         /*
 207          * XXX: It would be nice to support lower refresh rates on the
 208          * panels to reduce power consumption, and perhaps match the
 209          * user's requested refresh rate.
 210          */
 211
 212         return true;
 213 }
 214
 215 static void intel_lvds_prepare(struct drm_encoder *encoder)
 216 {
 217         struct drm_device *dev = encoder->dev;
 218         struct drm_i915_private *dev_priv = dev->dev_private;
 219
 220         dev_priv->saveBLC_PWM_CTL = I915_READ(BLC_PWM_CTL);
 221         dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
 222                                        BACKLIGHT_DUTY_CYCLE_MASK);
 223
 224         intel_lvds_set_power(dev, false);
 225 }
 226
 227 static void intel_lvds_commit( struct drm_encoder *encoder)
 228 {
 229         struct drm_device *dev = encoder->dev;
 230         struct drm_i915_private *dev_priv = dev->dev_private;
 231
 232         if (dev_priv->backlight_duty_cycle == 0)
 233                 dev_priv->backlight_duty_cycle =
 234                         intel_lvds_get_max_backlight(dev);
 235
 236         intel_lvds_set_power(dev, true);
 237 }
 238
 239 static void intel_lvds_mode_set(struct drm_encoder *encoder,
 240                                 struct drm_display_mode *mode,
 241                                 struct drm_display_mode *adjusted_mode)
 242 {
 243         struct drm_device *dev = encoder->dev;
 244         struct drm_i915_private *dev_priv = dev->dev_private;
 245         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
 246         u32 pfit_control;
 247
 248         /*
 249          * The LVDS pin pair will already have been turned on in the
 250          * intel_crtc_mode_set since it has a large impact on the DPLL
 251          * settings.
 252          */
 253
 254         /*
 255          * Enable automatic panel scaling so that non-native modes fill the
 256          * screen.  Should be enabled before the pipe is enabled, according to
 257          * register description and PRM.
 258          */
 259         if (mode->hdisplay != adjusted_mode->hdisplay ||
 260             mode->vdisplay != adjusted_mode->vdisplay)
 261                 pfit_control = (PFIT_ENABLE | VERT_AUTO_SCALE |
 262                                 HORIZ_AUTO_SCALE | VERT_INTERP_BILINEAR |
 263                                 HORIZ_INTERP_BILINEAR);
 264         else
 265                 pfit_control = 0;
 266
 267         if (!IS_I965G(dev)) {
 268                 if (dev_priv->panel_wants_dither || dev_priv->lvds_dither)
 269                         pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 270         }
 271         else
 272                 pfit_control |= intel_crtc->pipe << PFIT_PIPE_SHIFT;
 273
 274         I915_WRITE(PFIT_CONTROL, pfit_control);
 275 }
 276
 277 /**
 278  * Detect the LVDS connection.
 279  *
 280  * This always returns CONNECTOR_STATUS_CONNECTED.  This connector should only have
 281  * been set up if the LVDS was actually connected anyway.
 282  */
 283 static enum drm_connector_status intel_lvds_detect(struct drm_connector *connector)
 284 {
 285         return connector_status_connected;
 286 }
 287
 288 /**
 289  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 290  */
 291 static int intel_lvds_get_modes(struct drm_connector *connector)
 292 {
 293         struct drm_device *dev = connector->dev;
 294         struct intel_output *intel_output = to_intel_output(connector);
 295         struct drm_i915_private *dev_priv = dev->dev_private;
 296         int ret = 0;
 297
 298         ret = intel_ddc_get_modes(intel_output);
 299
 300         if (ret)
 301                 return ret;
 302
 303         /* Didn't get an EDID, so
 304          * Set wide sync ranges so we get all modes
 305          * handed to valid_mode for checking
 306          */
 307         connector->display_info.min_vfreq = 0;
 308         connector->display_info.max_vfreq = 200;
 309         connector->display_info.min_hfreq = 0;
 310         connector->display_info.max_hfreq = 200;
 311
 312         if (dev_priv->panel_fixed_mode != NULL) {
 313                 struct drm_display_mode *mode;
 314
 315                 mode = drm_mode_duplicate(dev, dev_priv->panel_fixed_mode);
 316                 drm_mode_probed_add(connector, mode);
 317
 318                 return 1;
 319         }
 320
 321         return 0;
 322 }
 323
 324 /**
 325  * intel_lvds_destroy - unregister and free LVDS structures
 326  * @connector: connector to free
 327  *
 328  * Unregister the DDC bus for this connector then free the driver private
 329  * structure.
 330  */
 331 static void intel_lvds_destroy(struct drm_connector *connector)
 332 {
 333         struct intel_output *intel_output = to_intel_output(connector);
 334
 335         if (intel_output->ddc_bus)
 336                 intel_i2c_destroy(intel_output->ddc_bus);
 337         drm_sysfs_connector_remove(connector);
 338         drm_connector_cleanup(connector);
 339         kfree(connector);
 340 }
 341
 342 static int intel_lvds_set_property(struct drm_connector *connector,
 343                                    struct drm_property *property,
 344                                    uint64_t value)
 345 {
 346         return 0;
 347 }
 348
 349 static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
 350         .dpms = intel_lvds_dpms,
 351         .mode_fixup = intel_lvds_mode_fixup,
 352         .prepare = intel_lvds_prepare,
 353         .mode_set = intel_lvds_mode_set,
 354         .commit = intel_lvds_commit,
 355 };
 356
 357 static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
 358         .get_modes = intel_lvds_get_modes,
 359         .mode_valid = intel_lvds_mode_valid,
 360         .best_encoder = intel_best_encoder,
 361 };
 362
 363 static const struct drm_connector_funcs intel_lvds_connector_funcs = {
 364         .dpms = drm_helper_connector_dpms,
 365         .save = intel_lvds_save,
 366         .restore = intel_lvds_restore,
 367         .detect = intel_lvds_detect,
 368         .fill_modes = drm_helper_probe_single_connector_modes,
 369         .set_property = intel_lvds_set_property,
 370         .destroy = intel_lvds_destroy,
 371 };
 372
 373
 374 static void intel_lvds_enc_destroy(struct drm_encoder *encoder)
 375 {
 376         drm_encoder_cleanup(encoder);
 377 }
 378
 379 static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
 380         .destroy = intel_lvds_enc_destroy,
 381 };
 382
 383 static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
 384 {
 385         DRM_DEBUG("Skipping LVDS initialization for %s\n", id->ident);
 386         return 1;
 387 }
 388
 389 /* These systems claim to have LVDS, but really don't */
 390 static const struct dmi_system_id intel_no_lvds[] = {
 391         {
 392                 .callback = intel_no_lvds_dmi_callback,
 393                 .ident = "Apple Mac Mini (Core series)",
 394                 .matches = {
 395                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 396                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
 397                 },
 398         },
 399         {
 400                 .callback = intel_no_lvds_dmi_callback,
 401                 .ident = "Apple Mac Mini (Core 2 series)",
 402                 .matches = {
 403                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 404                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
 405                 },
 406         },
 407         {
 408                 .callback = intel_no_lvds_dmi_callback,
 409                 .ident = "MSI IM-945GSE-A",
 410                 .matches = {
 411                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 412                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
 413                 },
 414         },
 415         {
 416                 .callback = intel_no_lvds_dmi_callback,
 417                 .ident = "Dell Studio Hybrid",
 418                 .matches = {
 419                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 420                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
 421                 },
 422         },
 423
 424         /* FIXME: add a check for the Aopen Mini PC */
 425
 426         { }     /* terminating entry */
 427 };
 428
 429 /**
 430  * intel_lvds_init - setup LVDS connectors on this device
 431  * @dev: drm device
 432  *
 433  * Create the connector, register the LVDS DDC bus, and try to figure out what
 434  * modes we can display on the LVDS panel (if present).
 435  */
 436 void intel_lvds_init(struct drm_device *dev)
 437 {
 438         struct drm_i915_private *dev_priv = dev->dev_private;
 439         struct intel_output *intel_output;
 440         struct drm_connector *connector;
 441         struct drm_encoder *encoder;
 442         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 443         struct drm_crtc *crtc;
 444         u32 lvds;
 445         int pipe;
 446
 447         /* Skip init on machines we know falsely report LVDS */
 448         if (dmi_check_system(intel_no_lvds))
 449                 return;
 450
 451         intel_output = kzalloc(sizeof(struct intel_output), GFP_KERNEL);
 452         if (!intel_output) {
 453                 return;
 454         }
 455
 456         connector = &intel_output->base;
 457         encoder = &intel_output->enc;
 458         drm_connector_init(dev, &intel_output->base, &intel_lvds_connector_funcs,
 459                            DRM_MODE_CONNECTOR_LVDS);
 460
 461         drm_encoder_init(dev, &intel_output->enc, &intel_lvds_enc_funcs,
 462                          DRM_MODE_ENCODER_LVDS);
 463
 464         drm_mode_connector_attach_encoder(&intel_output->base, &intel_output->enc);
 465         intel_output->type = INTEL_OUTPUT_LVDS;
 466
 467         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
 468         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
 469         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 470         connector->interlace_allowed = false;
 471         connector->doublescan_allowed = false;
 472
 473
 474         /*
 475          * LVDS discovery:
 476          * 1) check for EDID on DDC
 477          * 2) check for VBT data
 478          * 3) check to see if LVDS is already on
 479          *    if none of the above, no panel
 480          * 4) make sure lid is open
 481          *    if closed, act like it's not there for now
 482          */
 483
 484         /* Set up the DDC bus. */
 485         intel_output->ddc_bus = intel_i2c_create(dev, GPIOC, "LVDSDDC_C");
 486         if (!intel_output->ddc_bus) {
 487                 dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
 488                            "failed.\n");
 489                 goto failed;
 490         }
 491
 492         /*
 493          * Attempt to get the fixed panel mode from DDC.  Assume that the
 494          * preferred mode is the right one.
 495          */
 496         intel_ddc_get_modes(intel_output);
 497
 498         list_for_each_entry(scan, &connector->probed_modes, head) {
 499                 mutex_lock(&dev->mode_config.mutex);
 500                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
 501                         dev_priv->panel_fixed_mode =
 502                                 drm_mode_duplicate(dev, scan);
 503                         mutex_unlock(&dev->mode_config.mutex);
 504                         goto out;
 505                 }
 506                 mutex_unlock(&dev->mode_config.mutex);
 507         }
 508
 509         /* Failed to get EDID, what about VBT? */
 510         if (dev_priv->lfp_lvds_vbt_mode) {
 511                 mutex_lock(&dev->mode_config.mutex);
 512                 dev_priv->panel_fixed_mode =
 513                         drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
 514                 mutex_unlock(&dev->mode_config.mutex);
 515                 if (dev_priv->panel_fixed_mode) {
 516                         dev_priv->panel_fixed_mode->type |=
 517                                 DRM_MODE_TYPE_PREFERRED;
 518                         goto out;
 519                 }
 520         }
 521
 522         /*
 523          * If we didn't get EDID, try checking if the panel is already turned
 524          * on.  If so, assume that whatever is currently programmed is the
 525          * correct mode.
 526          */
 527         lvds = I915_READ(LVDS);
 528         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
 529         crtc = intel_get_crtc_from_pipe(dev, pipe);
 530
 531         if (crtc && (lvds & LVDS_PORT_EN)) {
 532                 dev_priv->panel_fixed_mode = intel_crtc_mode_get(dev, crtc);
 533                 if (dev_priv->panel_fixed_mode) {
 534                         dev_priv->panel_fixed_mode->type |=
 535                                 DRM_MODE_TYPE_PREFERRED;
 536                         goto out;
 537                 }
 538         }
 539
 540         /* If we still don't have a mode after all that, give up. */
 541         if (!dev_priv->panel_fixed_mode)
 542                 goto failed;
 543
 544 out:
 545         drm_sysfs_connector_add(connector);
 546         return;
 547
 548 failed:
 549         DRM_DEBUG("No LVDS modes found, disabling.\n");
 550         if (intel_output->ddc_bus)
 551                 intel_i2c_destroy(intel_output->ddc_bus);
 552         drm_connector_cleanup(connector);
 553         kfree(connector);
 554 }