linux-core/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_output *output, int mode)
  93 {
  94         struct drm_device *dev = output->dev;
  95
  96         if (mode == DPMSModeOn)
  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_output *output)
 105 {
 106         struct drm_device *dev = output->dev;
 107         struct drm_i915_private *dev_priv = dev->dev_private;
 108
 109         dev_priv->savePP_ON = I915_READ(LVDSPP_ON);
 110         dev_priv->savePP_OFF = I915_READ(LVDSPP_OFF);
 111         dev_priv->savePP_CONTROL = I915_READ(PP_CONTROL);
 112         dev_priv->savePP_CYCLE = I915_READ(PP_CYCLE);
 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_output *output)
 126 {
 127         struct drm_device *dev = output->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(LVDSPP_ON, dev_priv->savePP_ON);
 132         I915_WRITE(LVDSPP_OFF, dev_priv->savePP_OFF);
 133         I915_WRITE(PP_CYCLE, dev_priv->savePP_CYCLE);
 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_output *output,
 142                                  struct drm_display_mode *mode)
 143 {
 144         struct drm_device *dev = output->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_output *output,
 159                                   struct drm_display_mode *mode,
 160                                   struct drm_display_mode *adjusted_mode)
 161 {
 162         struct drm_device *dev = output->dev;
 163         struct drm_i915_private *dev_priv = dev->dev_private;
 164         struct intel_crtc *intel_crtc = output->crtc->driver_private;
 165         struct drm_output *tmp_output;
 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_output, &dev->mode_config.output_list, head) {
 175                 if (tmp_output != output && tmp_output->crtc == output->crtc) {
 176                         printk(KERN_ERR "Can't enable LVDS and another "
 177                                "output 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_output *output)
 215 {
 216         struct drm_device *dev = output->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_output *output)
 227 {
 228         struct drm_device *dev = output->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_output *output,
 239                                 struct drm_display_mode *mode,
 240                                 struct drm_display_mode *adjusted_mode)
 241 {
 242         struct drm_device *dev = output->dev;
 243         struct drm_i915_private *dev_priv = dev->dev_private;
 244         struct intel_crtc *intel_crtc = output->crtc->driver_private;
 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         pfit_control = (PFIT_ENABLE | VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 259                         VERT_INTERP_BILINEAR | HORIZ_INTERP_BILINEAR);
 260
 261         if (!IS_I965G(dev)) {
 262                 if (dev_priv->panel_wants_dither)
 263                         pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 264         }
 265         else
 266                 pfit_control |= intel_crtc->pipe << PFIT_PIPE_SHIFT;
 267
 268         I915_WRITE(PFIT_CONTROL, pfit_control);
 269 }
 270
 271 /**
 272  * Detect the LVDS connection.
 273  *
 274  * This always returns OUTPUT_STATUS_CONNECTED.  This output should only have
 275  * been set up if the LVDS was actually connected anyway.
 276  */
 277 static enum drm_output_status intel_lvds_detect(struct drm_output *output)
 278 {
 279         return output_status_connected;
 280 }
 281
 282 /**
 283  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 284  */
 285 static int intel_lvds_get_modes(struct drm_output *output)
 286 {
 287         struct drm_device *dev = output->dev;
 288         struct drm_i915_private *dev_priv = dev->dev_private;
 289         int ret = 0;
 290
 291         ret = intel_ddc_get_modes(output);
 292
 293         if (ret)
 294                 return ret;
 295
 296         /* Didn't get an EDID */
 297         if (!output->monitor_info) {
 298                 struct drm_display_info *dspinfo;
 299                 dspinfo = kzalloc(sizeof(*output->monitor_info), GFP_KERNEL);
 300                 if (!dspinfo)
 301                         goto out;
 302
 303                 /* Set wide sync ranges so we get all modes
 304                  * handed to valid_mode for checking
 305                  */
 306                 dspinfo->min_vfreq = 0;
 307                 dspinfo->max_vfreq = 200;
 308                 dspinfo->min_hfreq = 0;
 309                 dspinfo->max_hfreq = 200;
 310                 output->monitor_info = dspinfo;
 311         }
 312
 313 out:
 314         if (dev_priv->panel_fixed_mode != NULL) {
 315                 struct drm_display_mode *mode =
 316                         drm_mode_duplicate(dev, dev_priv->panel_fixed_mode);
 317                 drm_mode_probed_add(output, mode);
 318                 return 1;
 319         }
 320
 321         return 0;
 322 }
 323
 324 /**
 325  * intel_lvds_destroy - unregister and free LVDS structures
 326  * @output: output to free
 327  *
 328  * Unregister the DDC bus for this output then free the driver private
 329  * structure.
 330  */
 331 static void intel_lvds_destroy(struct drm_output *output)
 332 {
 333         struct intel_output *intel_output = output->driver_private;
 334
 335         intel_i2c_destroy(intel_output->ddc_bus);
 336         kfree(output->driver_private);
 337 }
 338
 339 static const struct drm_output_funcs intel_lvds_output_funcs = {
 340         .dpms = intel_lvds_dpms,
 341         .save = intel_lvds_save,
 342         .restore = intel_lvds_restore,
 343         .mode_valid = intel_lvds_mode_valid,
 344         .mode_fixup = intel_lvds_mode_fixup,
 345         .prepare = intel_lvds_prepare,
 346         .mode_set = intel_lvds_mode_set,
 347         .commit = intel_lvds_commit,
 348         .detect = intel_lvds_detect,
 349         .get_modes = intel_lvds_get_modes,
 350         .cleanup = intel_lvds_destroy
 351 };
 352
 353 /**
 354  * intel_lvds_init - setup LVDS outputs on this device
 355  * @dev: drm device
 356  *
 357  * Create the output, register the LVDS DDC bus, and try to figure out what
 358  * modes we can display on the LVDS panel (if present).
 359  */
 360 void intel_lvds_init(struct drm_device *dev)
 361 {
 362         struct drm_i915_private *dev_priv = dev->dev_private;
 363         struct drm_output *output;
 364         struct intel_output *intel_output;
 365         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 366         struct drm_crtc *crtc;
 367         u32 lvds;
 368         int pipe;
 369
 370         output = drm_output_create(dev, &intel_lvds_output_funcs, "LVDS");
 371         if (!output)
 372                 return;
 373
 374         intel_output = kmalloc(sizeof(struct intel_output), GFP_KERNEL);
 375         if (!intel_output) {
 376                 drm_output_destroy(output);
 377                 return;
 378         }
 379
 380         intel_output->type = INTEL_OUTPUT_LVDS;
 381         output->driver_private = intel_output;
 382         output->subpixel_order = SubPixelHorizontalRGB;
 383         output->interlace_allowed = FALSE;
 384         output->doublescan_allowed = FALSE;
 385
 386         /* Set up the DDC bus. */
 387         intel_output->ddc_bus = intel_i2c_create(dev, GPIOC, "LVDSDDC_C");
 388         if (!intel_output->ddc_bus) {
 389                 dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
 390                            "failed.\n");
 391                 return;
 392         }
 393
 394         /*
 395          * Attempt to get the fixed panel mode from DDC.  Assume that the
 396          * preferred mode is the right one.
 397          */
 398         intel_ddc_get_modes(output);
 399
 400         list_for_each_entry(scan, &output->probed_modes, head) {
 401                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
 402                         dev_priv->panel_fixed_mode =
 403                                 drm_mode_duplicate(dev, scan);
 404                         goto out; /* FIXME: check for quirks */
 405                 }
 406         }
 407
 408         /*
 409          * If we didn't get EDID, try checking if the panel is already turned
 410          * on.  If so, assume that whatever is currently programmed is the
 411          * correct mode.
 412          */
 413         lvds = I915_READ(LVDS);
 414         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
 415         crtc = intel_get_crtc_from_pipe(dev, pipe);
 416
 417         if (crtc && (lvds & LVDS_PORT_EN)) {
 418                 dev_priv->panel_fixed_mode = intel_crtc_mode_get(dev, crtc);
 419                 if (dev_priv->panel_fixed_mode) {
 420                         dev_priv->panel_fixed_mode->type |=
 421                                 DRM_MODE_TYPE_PREFERRED;
 422                         goto out; /* FIXME: check for quirks */
 423                 }
 424         }
 425
 426         /* If we still don't have a mode after all that, give up. */
 427         if (!dev_priv->panel_fixed_mode)
 428                 goto failed;
 429
 430         /* FIXME: probe the BIOS for modes and check for LVDS quirks */
 431 #if 0
 432         /* Get the LVDS fixed mode out of the BIOS.  We should support LVDS
 433          * with the BIOS being unavailable or broken, but lack the
 434          * configuration options for now.
 435          */
 436         bios_mode = intel_bios_get_panel_mode(pScrn);
 437         if (bios_mode != NULL) {
 438                 if (dev_priv->panel_fixed_mode != NULL) {
 439                         if (dev_priv->debug_modes &&
 440                             !xf86ModesEqual(dev_priv->panel_fixed_mode,
 441                                             bios_mode))
 442                         {
 443                                 xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
 444                                            "BIOS panel mode data doesn't match probed data, "
 445                                            "continuing with probed.\n");
 446                                 xf86DrvMsg(pScrn->scrnIndex, X_INFO, "BIOS mode:\n");
 447                                 xf86PrintModeline(pScrn->scrnIndex, bios_mode);
 448                                 xf86DrvMsg(pScrn->scrnIndex, X_INFO, "probed mode:\n");
 449                                 xf86PrintModeline(pScrn->scrnIndex, dev_priv->panel_fixed_mode);
 450                                 xfree(bios_mode->name);
 451                                 xfree(bios_mode);
 452                         }
 453                 }  else {
 454                         dev_priv->panel_fixed_mode = bios_mode;
 455                 }
 456         } else {
 457                 xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
 458                            "Couldn't detect panel mode.  Disabling panel\n");
 459                 goto disable_exit;
 460         }
 461
 462         /*
 463          * Blacklist machines with BIOSes that list an LVDS panel without
 464          * actually having one.
 465          */
 466         if (dev_priv->PciInfo->chipType == PCI_CHIP_I945_GM) {
 467                 /* aopen mini pc */
 468                 if (dev_priv->PciInfo->subsysVendor == 0xa0a0)
 469                         goto disable_exit;
 470
 471                 if ((dev_priv->PciInfo->subsysVendor == 0x8086) &&
 472                     (dev_priv->PciInfo->subsysCard == 0x7270)) {
 473                         /* It's a Mac Mini or Macbook Pro.
 474                          *
 475                          * Apple hardware is out to get us.  The macbook pro
 476                          * has a real LVDS panel, but the mac mini does not,
 477                          * and they have the same device IDs.  We'll
 478                          * distinguish by panel size, on the assumption
 479                          * that Apple isn't about to make any machines with an
 480                          * 800x600 display.
 481                          */
 482
 483                         if (dev_priv->panel_fixed_mode != NULL &&
 484                             dev_priv->panel_fixed_mode->HDisplay == 800 &&
 485                             dev_priv->panel_fixed_mode->VDisplay == 600)
 486                         {
 487                                 xf86DrvMsg(pScrn->scrnIndex, X_INFO,
 488                                            "Suspected Mac Mini, ignoring the LVDS\n");
 489                                 goto disable_exit;
 490                         }
 491                 }
 492         }
 493
 494 #endif
 495
 496 out:
 497         return;
 498
 499 failed:
 500         DRM_DEBUG("No LVDS modes found, disabling.\n");
 501         drm_output_destroy(output); /* calls intel_lvds_destroy above */
 502 }