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         drm_i915_private_t *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         drm_i915_private_t *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         drm_i915_private_t *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         drm_i915_private_t *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         drm_i915_private_t *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         drm_i915_private_t *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         drm_i915_private_t *dev_priv = dev->dev_private;
 164         struct intel_crtc *intel_crtc = output->crtc->driver_private;
 165         struct drm_output *tmp_output;
 166
 167 #if 0 /* FIXME: Check for other outputs on this pipe */
 168         spin_lock(&dev->mode_config.config_lock);
 169         list_for_each_entry(tmp_output, &dev->mode_config.output_list, head) {
 170                 if (tmp_output != output && tmp_output->crtc == output->crtc) {
 171                         printk(KERN_ERR "Can't enable LVDS and another "
 172                                "output on the same pipe\n");
 173                         return false;
 174                 }
 175         }
 176         spin_lock(&dev->mode_config.config_lock);
 177 #endif
 178
 179         if (intel_crtc->pipe == 0) {
 180                 printk(KERN_ERR "Can't support LVDS on pipe A\n");
 181                 return false;
 182         }
 183
 184         /*
 185          * If we have timings from the BIOS for the panel, put them in
 186          * to the adjusted mode.  The CRTC will be set up for this mode,
 187          * with the panel scaling set up to source from the H/VDisplay
 188          * of the original mode.
 189          */
 190         if (dev_priv->panel_fixed_mode != NULL) {
 191                 adjusted_mode->hdisplay = dev_priv->panel_fixed_mode->hdisplay;
 192                 adjusted_mode->hsync_start =
 193                         dev_priv->panel_fixed_mode->hsync_start;
 194                 adjusted_mode->hsync_end =
 195                         dev_priv->panel_fixed_mode->hsync_end;
 196                 adjusted_mode->htotal = dev_priv->panel_fixed_mode->htotal;
 197                 adjusted_mode->vdisplay = dev_priv->panel_fixed_mode->vdisplay;
 198                 adjusted_mode->vsync_start =
 199                         dev_priv->panel_fixed_mode->vsync_start;
 200                 adjusted_mode->vsync_end =
 201                         dev_priv->panel_fixed_mode->vsync_end;
 202                 adjusted_mode->vtotal = dev_priv->panel_fixed_mode->vtotal;
 203                 adjusted_mode->clock = dev_priv->panel_fixed_mode->clock;
 204                 drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);
 205         }
 206
 207         /*
 208          * XXX: It would be nice to support lower refresh rates on the
 209          * panels to reduce power consumption, and perhaps match the
 210          * user's requested refresh rate.
 211          */
 212
 213         return true;
 214 }
 215
 216 static void intel_lvds_mode_set(struct drm_output *output,
 217                                 struct drm_display_mode *mode,
 218                                 struct drm_display_mode *adjusted_mode)
 219 {
 220         struct drm_device *dev = output->dev;
 221         drm_i915_private_t *dev_priv = dev->dev_private;
 222         struct intel_crtc *intel_crtc = output->crtc->driver_private;
 223         u32 pfit_control;
 224
 225         /*
 226          * The LVDS pin pair will already have been turned on in the
 227          * intel_crtc_mode_set since it has a large impact on the DPLL
 228          * settings.
 229          */
 230
 231         /*
 232          * Enable automatic panel scaling so that non-native modes fill the
 233          * screen.  Should be enabled before the pipe is enabled, according to
 234          * register description and PRM.
 235          */
 236         pfit_control = (PFIT_ENABLE | VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
 237                         VERT_INTERP_BILINEAR | HORIZ_INTERP_BILINEAR);
 238
 239         if (!IS_I965G(dev)) {
 240                 if (dev_priv->panel_wants_dither)
 241                         pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 242         }
 243         else
 244                 pfit_control |= intel_crtc->pipe << PFIT_PIPE_SHIFT;
 245
 246         I915_WRITE(PFIT_CONTROL, pfit_control);
 247 }
 248
 249 /**
 250  * Detect the LVDS connection.
 251  *
 252  * This always returns OUTPUT_STATUS_CONNECTED.  This output should only have
 253  * been set up if the LVDS was actually connected anyway.
 254  */
 255 static enum drm_output_status intel_lvds_detect(struct drm_output *output)
 256 {
 257         return output_status_connected;
 258 }
 259
 260 /**
 261  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
 262  */
 263 static int intel_lvds_get_modes(struct drm_output *output)
 264 {
 265         struct intel_output *intel_output = output->driver_private;
 266         struct drm_device *dev = output->dev;
 267         drm_i915_private_t *dev_priv = dev->dev_private;
 268         struct edid *edid_info;
 269         int ret = 0;
 270
 271         ret = intel_ddc_get_modes(output);
 272
 273         if (ret)
 274                 return ret;
 275
 276         /* Didn't get an EDID */
 277         if (!output->monitor_info) {
 278                 struct detailed_data_monitor_range *edid_range;
 279                 edid_info = kzalloc(sizeof(*output->monitor_info), GFP_KERNEL);
 280                 if (!edid_info)
 281                         goto out;
 282
 283                 edid_info->detailed_timings[0].data.other_data.type =
 284                         EDID_DETAIL_MONITOR_RANGE;
 285                 edid_range = &edid_info->detailed_timings[0].data.other_data.data.range;
 286
 287                 /* Set wide sync ranges so we get all modes
 288                  * handed to valid_mode for checking
 289                  */
 290                 edid_range->min_vfreq = 0;
 291                 edid_range->max_vfreq = 200;
 292                 edid_range->min_hfreq_khz = 0;
 293                 edid_range->max_hfreq_khz = 200;
 294                 output->monitor_info = edid_info;
 295         }
 296
 297 out:
 298         if (dev_priv->panel_fixed_mode != NULL) {
 299                 struct drm_display_mode *mode =
 300                         drm_mode_duplicate(dev, dev_priv->panel_fixed_mode);
 301                 drm_mode_probed_add(output, mode);
 302                 return 1;
 303         }
 304
 305         return 0;
 306 }
 307
 308 /**
 309  * intel_lvds_destroy - unregister and free LVDS structures
 310  * @output: output to free
 311  *
 312  * Unregister the DDC bus for this output then free the driver private
 313  * structure.
 314  */
 315 static void intel_lvds_destroy(struct drm_output *output)
 316 {
 317         struct intel_output *intel_output = output->driver_private;
 318
 319         intel_i2c_destroy(intel_output->ddc_bus);
 320
 321         if (output->driver_private)
 322                 kfree(output->driver_private);
 323 }
 324
 325 static const struct drm_output_funcs intel_lvds_output_funcs = {
 326         .dpms = intel_lvds_dpms,
 327         .save = intel_lvds_save,
 328         .restore = intel_lvds_restore,
 329         .mode_valid = intel_lvds_mode_valid,
 330         .mode_fixup = intel_lvds_mode_fixup,
 331         .prepare = intel_output_prepare,
 332         .mode_set = intel_lvds_mode_set,
 333         .commit = intel_output_commit,
 334         .detect = intel_lvds_detect,
 335         .get_modes = intel_lvds_get_modes,
 336         .cleanup = intel_lvds_destroy
 337 };
 338
 339 /**
 340  * intel_lvds_init - setup LVDS outputs on this device
 341  * @dev: drm device
 342  *
 343  * Create the output, register the LVDS DDC bus, and try to figure out what
 344  * modes we can display on the LVDS panel (if present).
 345  */
 346 void intel_lvds_init(struct drm_device *dev)
 347 {
 348         drm_i915_private_t *dev_priv = dev->dev_private;
 349         struct drm_output *output;
 350         struct intel_output *intel_output;
 351         struct drm_display_mode *scan; /* *modes, *bios_mode; */
 352
 353         output = drm_output_create(dev, &intel_lvds_output_funcs, "LVDS");
 354         if (!output)
 355                 return;
 356
 357         intel_output = kmalloc(sizeof(struct intel_output), GFP_KERNEL);
 358         if (!intel_output) {
 359                 drm_output_destroy(output);
 360                 return;
 361         }
 362
 363         intel_output->type = INTEL_OUTPUT_LVDS;
 364         output->driver_private = intel_output;
 365         output->subpixel_order = SubPixelHorizontalRGB;
 366         output->interlace_allowed = FALSE;
 367         output->doublescan_allowed = FALSE;
 368
 369         /* Set up the DDC bus. */
 370         intel_output->ddc_bus = intel_i2c_create(dev, GPIOC, "LVDSDDC_C");
 371         if (!intel_output->ddc_bus) {
 372                 dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
 373                            "failed.\n");
 374                 return;
 375         }
 376
 377         /*
 378          * Attempt to get the fixed panel mode from DDC.  Assume that the
 379          * preferred mode is the right one.
 380          */
 381         intel_ddc_get_modes(output);
 382
 383         list_for_each_entry(scan, &output->probed_modes, head) {
 384                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
 385                         dev_priv->panel_fixed_mode =
 386                                 drm_mode_duplicate(dev, scan);
 387                         break;
 388                 }
 389         }
 390
 391 #if 0
 392         /*
 393          * If we didn't get EDID, try checking if the panel is already turned
 394          * on.  If so, assume that whatever is currently programmed is the
 395          * correct mode.
 396          */
 397         if (!dev_priv->panel_fixed_mode) {
 398                 u32 lvds = I915_READ(LVDS);
 399                 int pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
 400                 struct drm_mode_config *mode_config = &dev->mode_config;
 401                 struct drm_crtc *crtc;
 402                 /* FIXME: need drm_crtc_from_pipe */
 403                 //crtc = drm_crtc_from_pipe(mode_config, pipe);
 404
 405                 if (lvds & LVDS_PORT_EN && 0) {
 406                         dev_priv->panel_fixed_mode =
 407                                 intel_crtc_mode_get(dev, crtc);
 408                         if (dev_priv->panel_fixed_mode)
 409                                 dev_priv->panel_fixed_mode->type |=
 410                                         DRM_MODE_TYPE_PREFERRED;
 411                 }
 412         }
 413
 414 /* No BIOS poking yet... */
 415         /* Get the LVDS fixed mode out of the BIOS.  We should support LVDS
 416          * with the BIOS being unavailable or broken, but lack the
 417          * configuration options for now.
 418          */
 419         bios_mode = intel_bios_get_panel_mode(pScrn);
 420         if (bios_mode != NULL) {
 421                 if (dev_priv->panel_fixed_mode != NULL) {
 422                         if (dev_priv->debug_modes &&
 423                             !xf86ModesEqual(dev_priv->panel_fixed_mode,
 424                                             bios_mode))
 425                         {
 426                                 xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
 427                                            "BIOS panel mode data doesn't match probed data, "
 428                                            "continuing with probed.\n");
 429                                 xf86DrvMsg(pScrn->scrnIndex, X_INFO, "BIOS mode:\n");
 430                                 xf86PrintModeline(pScrn->scrnIndex, bios_mode);
 431                                 xf86DrvMsg(pScrn->scrnIndex, X_INFO, "probed mode:\n");
 432                                 xf86PrintModeline(pScrn->scrnIndex, dev_priv->panel_fixed_mode);
 433                                 xfree(bios_mode->name);
 434                                 xfree(bios_mode);
 435                         }
 436                 }  else {
 437                         dev_priv->panel_fixed_mode = bios_mode;
 438                 }
 439         } else {
 440                 xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
 441                            "Couldn't detect panel mode.  Disabling panel\n");
 442                 goto disable_exit;
 443         }
 444
 445         /* Blacklist machines with BIOSes that list an LVDS panel without actually
 446          * having one.
 447          */
 448         if (dev_priv->PciInfo->chipType == PCI_CHIP_I945_GM) {
 449                 if (dev_priv->PciInfo->subsysVendor == 0xa0a0)  /* aopen mini pc */
 450                         goto disable_exit;
 451
 452                 if ((dev_priv->PciInfo->subsysVendor == 0x8086) &&
 453                     (dev_priv->PciInfo->subsysCard == 0x7270)) {
 454                         /* It's a Mac Mini or Macbook Pro.
 455                          *
 456                          * Apple hardware is out to get us.  The macbook pro has a real
 457                          * LVDS panel, but the mac mini does not, and they have the same
 458                          * device IDs.  We'll distinguish by panel size, on the assumption
 459                          * that Apple isn't about to make any machines with an 800x600
 460                          * display.
 461                          */
 462
 463                         if (dev_priv->panel_fixed_mode != NULL &&
 464                             dev_priv->panel_fixed_mode->HDisplay == 800 &&
 465                             dev_priv->panel_fixed_mode->VDisplay == 600)
 466                         {
 467                                 xf86DrvMsg(pScrn->scrnIndex, X_INFO,
 468                                            "Suspected Mac Mini, ignoring the LVDS\n");
 469                                 goto disable_exit;
 470                         }
 471                 }
 472         }
 473
 474 #endif
 475         return;
 476 }