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  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 <acpi/button.h>
  31. //#include <linux/dmi.h>
  32. #include <linux/i2c.h>
  33. #include <linux/slab.h>
  34. #include <drm/drmP.h>
  35. #include <drm/drm_crtc.h>
  36. #include <drm/drm_edid.h>
  37. #include "intel_drv.h"
  38. #include <drm/i915_drm.h>
  39. #include "i915_drv.h"
  40. //#include <linux/acpi.h>
  41.  
  42. /* Private structure for the integrated LVDS support */
  43. struct intel_lvds_connector {
  44.         struct intel_connector base;
  45.  
  46. //      struct notifier_block lid_notifier;
  47. };
  48.  
  49. struct intel_lvds_encoder {
  50.         struct intel_encoder base;
  51.  
  52.         u32 pfit_control;
  53.         u32 pfit_pgm_ratios;
  54.         bool pfit_dirty;
  55.  
  56.         struct intel_lvds_connector *attached_connector;
  57. };
  58.  
  59. static struct intel_lvds_encoder *to_lvds_encoder(struct drm_encoder *encoder)
  60. {
  61.         return container_of(encoder, struct intel_lvds_encoder, base.base);
  62. }
  63.  
  64. static struct intel_lvds_connector *to_lvds_connector(struct drm_connector *connector)
  65. {
  66.         return container_of(connector, struct intel_lvds_connector, base.base);
  67. }
  68.  
  69. static bool intel_lvds_get_hw_state(struct intel_encoder *encoder,
  70.                                     enum pipe *pipe)
  71. {
  72.         struct drm_device *dev = encoder->base.dev;
  73.         struct drm_i915_private *dev_priv = dev->dev_private;
  74.         u32 lvds_reg, tmp;
  75.  
  76.         if (HAS_PCH_SPLIT(dev)) {
  77.                 lvds_reg = PCH_LVDS;
  78.         } else {
  79.                 lvds_reg = LVDS;
  80.         }
  81.  
  82.         tmp = I915_READ(lvds_reg);
  83.  
  84.         if (!(tmp & LVDS_PORT_EN))
  85.                 return false;
  86.  
  87.         if (HAS_PCH_CPT(dev))
  88.                 *pipe = PORT_TO_PIPE_CPT(tmp);
  89.         else
  90.                 *pipe = PORT_TO_PIPE(tmp);
  91.  
  92.         return true;
  93. }
  94.  
  95. /**
  96.  * Sets the power state for the panel.
  97.  */
  98. static void intel_enable_lvds(struct intel_encoder *encoder)
  99. {
  100.         struct drm_device *dev = encoder->base.dev;
  101.         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
  102.         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
  103.         struct drm_i915_private *dev_priv = dev->dev_private;
  104.         u32 ctl_reg, lvds_reg, stat_reg;
  105.  
  106.         if (HAS_PCH_SPLIT(dev)) {
  107.                 ctl_reg = PCH_PP_CONTROL;
  108.                 lvds_reg = PCH_LVDS;
  109.                 stat_reg = PCH_PP_STATUS;
  110.         } else {
  111.                 ctl_reg = PP_CONTROL;
  112.                 lvds_reg = LVDS;
  113.                 stat_reg = PP_STATUS;
  114.         }
  115.  
  116.         I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
  117.  
  118.         if (lvds_encoder->pfit_dirty) {
  119.                 /*
  120.                  * Enable automatic panel scaling so that non-native modes
  121.                  * fill the screen.  The panel fitter should only be
  122.                  * adjusted whilst the pipe is disabled, according to
  123.                  * register description and PRM.
  124.                  */
  125.                 DRM_DEBUG_KMS("applying panel-fitter: %x, %x\n",
  126.                               lvds_encoder->pfit_control,
  127.                               lvds_encoder->pfit_pgm_ratios);
  128.  
  129.                 I915_WRITE(PFIT_PGM_RATIOS, lvds_encoder->pfit_pgm_ratios);
  130.                 I915_WRITE(PFIT_CONTROL, lvds_encoder->pfit_control);
  131.                 lvds_encoder->pfit_dirty = false;
  132.         }
  133.  
  134.         I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
  135.         POSTING_READ(lvds_reg);
  136.         if (wait_for((I915_READ(stat_reg) & PP_ON) != 0, 1000))
  137.                 DRM_ERROR("timed out waiting for panel to power on\n");
  138.  
  139.         intel_panel_enable_backlight(dev, intel_crtc->pipe);
  140. }
  141.  
  142. static void intel_disable_lvds(struct intel_encoder *encoder)
  143. {
  144.         struct drm_device *dev = encoder->base.dev;
  145.         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
  146.         struct drm_i915_private *dev_priv = dev->dev_private;
  147.         u32 ctl_reg, lvds_reg, stat_reg;
  148.  
  149.         if (HAS_PCH_SPLIT(dev)) {
  150.                 ctl_reg = PCH_PP_CONTROL;
  151.                 lvds_reg = PCH_LVDS;
  152.                 stat_reg = PCH_PP_STATUS;
  153.         } else {
  154.                 ctl_reg = PP_CONTROL;
  155.                 lvds_reg = LVDS;
  156.                 stat_reg = PP_STATUS;
  157.         }
  158.  
  159.         intel_panel_disable_backlight(dev);
  160.  
  161.         I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
  162.         if (wait_for((I915_READ(stat_reg) & PP_ON) == 0, 1000))
  163.                 DRM_ERROR("timed out waiting for panel to power off\n");
  164.  
  165.         if (lvds_encoder->pfit_control) {
  166.                 I915_WRITE(PFIT_CONTROL, 0);
  167.                 lvds_encoder->pfit_dirty = true;
  168.         }
  169.  
  170.         I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
  171.         POSTING_READ(lvds_reg);
  172. }
  173.  
  174. static int intel_lvds_mode_valid(struct drm_connector *connector,
  175.                                  struct drm_display_mode *mode)
  176. {
  177.         struct intel_connector *intel_connector = to_intel_connector(connector);
  178.         struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
  179.  
  180.         if (mode->hdisplay > fixed_mode->hdisplay)
  181.                 return MODE_PANEL;
  182.         if (mode->vdisplay > fixed_mode->vdisplay)
  183.                 return MODE_PANEL;
  184.  
  185.         return MODE_OK;
  186. }
  187.  
  188. static void
  189. centre_horizontally(struct drm_display_mode *mode,
  190.                     int width)
  191. {
  192.         u32 border, sync_pos, blank_width, sync_width;
  193.  
  194.         /* keep the hsync and hblank widths constant */
  195.         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
  196.         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
  197.         sync_pos = (blank_width - sync_width + 1) / 2;
  198.  
  199.         border = (mode->hdisplay - width + 1) / 2;
  200.         border += border & 1; /* make the border even */
  201.  
  202.         mode->crtc_hdisplay = width;
  203.         mode->crtc_hblank_start = width + border;
  204.         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
  205.  
  206.         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
  207.         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
  208.  
  209.         mode->private_flags |= INTEL_MODE_CRTC_TIMINGS_SET;
  210. }
  211.  
  212. static void
  213. centre_vertically(struct drm_display_mode *mode,
  214.                   int height)
  215. {
  216.         u32 border, sync_pos, blank_width, sync_width;
  217.  
  218.         /* keep the vsync and vblank widths constant */
  219.         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
  220.         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
  221.         sync_pos = (blank_width - sync_width + 1) / 2;
  222.  
  223.         border = (mode->vdisplay - height + 1) / 2;
  224.  
  225.         mode->crtc_vdisplay = height;
  226.         mode->crtc_vblank_start = height + border;
  227.         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
  228.  
  229.         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
  230.         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
  231.  
  232.         mode->private_flags |= INTEL_MODE_CRTC_TIMINGS_SET;
  233. }
  234.  
  235. static inline u32 panel_fitter_scaling(u32 source, u32 target)
  236. {
  237.         /*
  238.          * Floating point operation is not supported. So the FACTOR
  239.          * is defined, which can avoid the floating point computation
  240.          * when calculating the panel ratio.
  241.          */
  242. #define ACCURACY 12
  243. #define FACTOR (1 << ACCURACY)
  244.         u32 ratio = source * FACTOR / target;
  245.         return (FACTOR * ratio + FACTOR/2) / FACTOR;
  246. }
  247.  
  248. static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
  249.                                   const struct drm_display_mode *mode,
  250.                                   struct drm_display_mode *adjusted_mode)
  251. {
  252.         struct drm_device *dev = encoder->dev;
  253.         struct drm_i915_private *dev_priv = dev->dev_private;
  254.         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(encoder);
  255.         struct intel_connector *intel_connector =
  256.                 &lvds_encoder->attached_connector->base;
  257.         struct intel_crtc *intel_crtc = lvds_encoder->base.new_crtc;
  258.         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
  259.         int pipe;
  260.  
  261.         /* Should never happen!! */
  262.         if (INTEL_INFO(dev)->gen < 4 && intel_crtc->pipe == 0) {
  263.                 DRM_ERROR("Can't support LVDS on pipe A\n");
  264.                 return false;
  265.         }
  266.  
  267.         if (intel_encoder_check_is_cloned(&lvds_encoder->base))
  268.                         return false;
  269.  
  270.         /*
  271.          * We have timings from the BIOS for the panel, put them in
  272.          * to the adjusted mode.  The CRTC will be set up for this mode,
  273.          * with the panel scaling set up to source from the H/VDisplay
  274.          * of the original mode.
  275.          */
  276.         intel_fixed_panel_mode(intel_connector->panel.fixed_mode,
  277.                                adjusted_mode);
  278.  
  279.         if (HAS_PCH_SPLIT(dev)) {
  280.                 intel_pch_panel_fitting(dev,
  281.                                         intel_connector->panel.fitting_mode,
  282.                                         mode, adjusted_mode);
  283.                 return true;
  284.         }
  285.  
  286.         /* Native modes don't need fitting */
  287.         if (adjusted_mode->hdisplay == mode->hdisplay &&
  288.             adjusted_mode->vdisplay == mode->vdisplay)
  289.                 goto out;
  290.  
  291.         /* 965+ wants fuzzy fitting */
  292.         if (INTEL_INFO(dev)->gen >= 4)
  293.                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
  294.                                  PFIT_FILTER_FUZZY);
  295.  
  296.         /*
  297.          * Enable automatic panel scaling for non-native modes so that they fill
  298.          * the screen.  Should be enabled before the pipe is enabled, according
  299.          * to register description and PRM.
  300.          * Change the value here to see the borders for debugging
  301.          */
  302.         for_each_pipe(pipe)
  303.                 I915_WRITE(BCLRPAT(pipe), 0);
  304.  
  305.         drm_mode_set_crtcinfo(adjusted_mode, 0);
  306.  
  307.         switch (intel_connector->panel.fitting_mode) {
  308.         case DRM_MODE_SCALE_CENTER:
  309.                 /*
  310.                  * For centered modes, we have to calculate border widths &
  311.                  * heights and modify the values programmed into the CRTC.
  312.                  */
  313.                 centre_horizontally(adjusted_mode, mode->hdisplay);
  314.                 centre_vertically(adjusted_mode, mode->vdisplay);
  315.                 border = LVDS_BORDER_ENABLE;
  316.                 break;
  317.  
  318.         case DRM_MODE_SCALE_ASPECT:
  319.                 /* Scale but preserve the aspect ratio */
  320.                 if (INTEL_INFO(dev)->gen >= 4) {
  321.                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
  322.                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
  323.  
  324.                         /* 965+ is easy, it does everything in hw */
  325.                         if (scaled_width > scaled_height)
  326.                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_PILLAR;
  327.                         else if (scaled_width < scaled_height)
  328.                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_LETTER;
  329.                         else if (adjusted_mode->hdisplay != mode->hdisplay)
  330.                                 pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
  331.                 } else {
  332.                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
  333.                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
  334.                         /*
  335.                          * For earlier chips we have to calculate the scaling
  336.                          * ratio by hand and program it into the
  337.                          * PFIT_PGM_RATIO register
  338.                          */
  339.                         if (scaled_width > scaled_height) { /* pillar */
  340.                                 centre_horizontally(adjusted_mode, scaled_height / mode->vdisplay);
  341.  
  342.                                 border = LVDS_BORDER_ENABLE;
  343.                                 if (mode->vdisplay != adjusted_mode->vdisplay) {
  344.                                         u32 bits = panel_fitter_scaling(mode->vdisplay, adjusted_mode->vdisplay);
  345.                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
  346.                                                             bits << PFIT_VERT_SCALE_SHIFT);
  347.                                         pfit_control |= (PFIT_ENABLE |
  348.                                                          VERT_INTERP_BILINEAR |
  349.                                                          HORIZ_INTERP_BILINEAR);
  350.                                 }
  351.                         } else if (scaled_width < scaled_height) { /* letter */
  352.                                 centre_vertically(adjusted_mode, scaled_width / mode->hdisplay);
  353.  
  354.                                 border = LVDS_BORDER_ENABLE;
  355.                                 if (mode->hdisplay != adjusted_mode->hdisplay) {
  356.                                         u32 bits = panel_fitter_scaling(mode->hdisplay, adjusted_mode->hdisplay);
  357.                                         pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
  358.                                                             bits << PFIT_VERT_SCALE_SHIFT);
  359.                                         pfit_control |= (PFIT_ENABLE |
  360.                                                          VERT_INTERP_BILINEAR |
  361.                                                          HORIZ_INTERP_BILINEAR);
  362.                                 }
  363.                         } else
  364.                                 /* Aspects match, Let hw scale both directions */
  365.                                 pfit_control |= (PFIT_ENABLE |
  366.                                                  VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
  367.                                                  VERT_INTERP_BILINEAR |
  368.                                                  HORIZ_INTERP_BILINEAR);
  369.                 }
  370.                 break;
  371.  
  372.         case DRM_MODE_SCALE_FULLSCREEN:
  373.                 /*
  374.                  * Full scaling, even if it changes the aspect ratio.
  375.                  * Fortunately this is all done for us in hw.
  376.                  */
  377.                 if (mode->vdisplay != adjusted_mode->vdisplay ||
  378.                     mode->hdisplay != adjusted_mode->hdisplay) {
  379.                         pfit_control |= PFIT_ENABLE;
  380.                         if (INTEL_INFO(dev)->gen >= 4)
  381.                                 pfit_control |= PFIT_SCALING_AUTO;
  382.                         else
  383.                                 pfit_control |= (VERT_AUTO_SCALE |
  384.                                                  VERT_INTERP_BILINEAR |
  385.                                                  HORIZ_AUTO_SCALE |
  386.                                                  HORIZ_INTERP_BILINEAR);
  387.                 }
  388.                 break;
  389.  
  390.         default:
  391.                 break;
  392.         }
  393.  
  394. out:
  395.         /* If not enabling scaling, be consistent and always use 0. */
  396.         if ((pfit_control & PFIT_ENABLE) == 0) {
  397.                 pfit_control = 0;
  398.                 pfit_pgm_ratios = 0;
  399.         }
  400.  
  401.         /* Make sure pre-965 set dither correctly */
  402.         if (INTEL_INFO(dev)->gen < 4 && dev_priv->lvds_dither)
  403.                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
  404.  
  405.         if (pfit_control != lvds_encoder->pfit_control ||
  406.             pfit_pgm_ratios != lvds_encoder->pfit_pgm_ratios) {
  407.                 lvds_encoder->pfit_control = pfit_control;
  408.                 lvds_encoder->pfit_pgm_ratios = pfit_pgm_ratios;
  409.                 lvds_encoder->pfit_dirty = true;
  410.         }
  411.         dev_priv->lvds_border_bits = border;
  412.  
  413.         /*
  414.          * XXX: It would be nice to support lower refresh rates on the
  415.          * panels to reduce power consumption, and perhaps match the
  416.          * user's requested refresh rate.
  417.          */
  418.  
  419.         return true;
  420. }
  421.  
  422. static void intel_lvds_mode_set(struct drm_encoder *encoder,
  423.                                 struct drm_display_mode *mode,
  424.                                 struct drm_display_mode *adjusted_mode)
  425. {
  426.         /*
  427.          * The LVDS pin pair will already have been turned on in the
  428.          * intel_crtc_mode_set since it has a large impact on the DPLL
  429.          * settings.
  430.          */
  431. }
  432.  
  433. /**
  434.  * Detect the LVDS connection.
  435.  *
  436.  * Since LVDS doesn't have hotlug, we use the lid as a proxy.  Open means
  437.  * connected and closed means disconnected.  We also send hotplug events as
  438.  * needed, using lid status notification from the input layer.
  439.  */
  440. static enum drm_connector_status
  441. intel_lvds_detect(struct drm_connector *connector, bool force)
  442. {
  443.         struct drm_device *dev = connector->dev;
  444.         enum drm_connector_status status;
  445.  
  446.         status = intel_panel_detect(dev);
  447.         if (status != connector_status_unknown)
  448.                 return status;
  449.  
  450.         return connector_status_connected;
  451. }
  452.  
  453. /**
  454.  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
  455.  */
  456. static int intel_lvds_get_modes(struct drm_connector *connector)
  457. {
  458.         struct intel_lvds_connector *lvds_connector = to_lvds_connector(connector);
  459.         struct drm_device *dev = connector->dev;
  460.         struct drm_display_mode *mode;
  461.  
  462.         /* use cached edid if we have one */
  463.         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
  464.                 return drm_add_edid_modes(connector, lvds_connector->base.edid);
  465.  
  466.         mode = drm_mode_duplicate(dev, lvds_connector->base.panel.fixed_mode);
  467.         if (mode == NULL)
  468.                 return 0;
  469.  
  470.         drm_mode_probed_add(connector, mode);
  471.         return 1;
  472. }
  473.  
  474. static int intel_no_modeset_on_lid_dmi_callback(const struct dmi_system_id *id)
  475. {
  476.         DRM_INFO("Skipping forced modeset for %s\n", id->ident);
  477.         return 1;
  478. }
  479.  
  480. /* The GPU hangs up on these systems if modeset is performed on LID open */
  481. static const struct dmi_system_id intel_no_modeset_on_lid[] = {
  482.         {
  483.                 .callback = intel_no_modeset_on_lid_dmi_callback,
  484.                 .ident = "Toshiba Tecra A11",
  485.                 .matches = {
  486.                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  487.                         DMI_MATCH(DMI_PRODUCT_NAME, "TECRA A11"),
  488.                 },
  489.         },
  490.  
  491.         { }     /* terminating entry */
  492. };
  493.  
  494. #if 0
  495. /*
  496.  * Lid events. Note the use of 'modeset_on_lid':
  497.  *  - we set it on lid close, and reset it on open
  498.  *  - we use it as a "only once" bit (ie we ignore
  499.  *    duplicate events where it was already properly
  500.  *    set/reset)
  501.  *  - the suspend/resume paths will also set it to
  502.  *    zero, since they restore the mode ("lid open").
  503.  */
  504. static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
  505.                             void *unused)
  506. {
  507.         struct intel_lvds_connector *lvds_connector =
  508.                 container_of(nb, struct intel_lvds_connector, lid_notifier);
  509.         struct drm_connector *connector = &lvds_connector->base.base;
  510.         struct drm_device *dev = connector->dev;
  511.         struct drm_i915_private *dev_priv = dev->dev_private;
  512.  
  513.         if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
  514.                 return NOTIFY_OK;
  515.  
  516.         /*
  517.          * check and update the status of LVDS connector after receiving
  518.          * the LID nofication event.
  519.          */
  520.         connector->status = connector->funcs->detect(connector, false);
  521.  
  522.         /* Don't force modeset on machines where it causes a GPU lockup */
  523.         if (dmi_check_system(intel_no_modeset_on_lid))
  524.                 return NOTIFY_OK;
  525.         if (!acpi_lid_open()) {
  526.                 dev_priv->modeset_on_lid = 1;
  527.                 return NOTIFY_OK;
  528.         }
  529.  
  530.         if (!dev_priv->modeset_on_lid)
  531.                 return NOTIFY_OK;
  532.  
  533.         dev_priv->modeset_on_lid = 0;
  534.  
  535.         mutex_lock(&dev->mode_config.mutex);
  536.         intel_modeset_setup_hw_state(dev, true);
  537.         mutex_unlock(&dev->mode_config.mutex);
  538.  
  539.         return NOTIFY_OK;
  540. }
  541. #endif
  542.  
  543. /**
  544.  * 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. static void intel_lvds_destroy(struct drm_connector *connector)
  551. {
  552.         struct intel_lvds_connector *lvds_connector =
  553.                 to_lvds_connector(connector);
  554.  
  555.  
  556.         if (!IS_ERR_OR_NULL(lvds_connector->base.edid))
  557.                 kfree(lvds_connector->base.edid);
  558.  
  559.         intel_panel_destroy_backlight(connector->dev);
  560.         intel_panel_fini(&lvds_connector->base.panel);
  561.  
  562.         drm_sysfs_connector_remove(connector);
  563.         drm_connector_cleanup(connector);
  564.         kfree(connector);
  565. }
  566.  
  567. static int intel_lvds_set_property(struct drm_connector *connector,
  568.                                    struct drm_property *property,
  569.                                    uint64_t value)
  570. {
  571.         struct intel_connector *intel_connector = to_intel_connector(connector);
  572.         struct drm_device *dev = connector->dev;
  573.  
  574.         if (property == dev->mode_config.scaling_mode_property) {
  575.                 struct drm_crtc *crtc;
  576.  
  577.                 if (value == DRM_MODE_SCALE_NONE) {
  578.                         DRM_DEBUG_KMS("no scaling not supported\n");
  579.                         return -EINVAL;
  580.                 }
  581.  
  582.                 if (intel_connector->panel.fitting_mode == value) {
  583.                         /* the LVDS scaling property is not changed */
  584.                         return 0;
  585.                 }
  586.                 intel_connector->panel.fitting_mode = value;
  587.  
  588.                 crtc = intel_attached_encoder(connector)->base.crtc;
  589.                 if (crtc && crtc->enabled) {
  590.                         /*
  591.                          * If the CRTC is enabled, the display will be changed
  592.                          * according to the new panel fitting mode.
  593.                          */
  594.                         intel_set_mode(crtc, &crtc->mode,
  595.                                 crtc->x, crtc->y, crtc->fb);
  596.                 }
  597.         }
  598.  
  599.         return 0;
  600. }
  601.  
  602. static const struct drm_encoder_helper_funcs intel_lvds_helper_funcs = {
  603.         .mode_fixup = intel_lvds_mode_fixup,
  604.         .mode_set = intel_lvds_mode_set,
  605.         .disable = intel_encoder_noop,
  606. };
  607.  
  608. static const struct drm_connector_helper_funcs intel_lvds_connector_helper_funcs = {
  609.         .get_modes = intel_lvds_get_modes,
  610.         .mode_valid = intel_lvds_mode_valid,
  611.         .best_encoder = intel_best_encoder,
  612. };
  613.  
  614. static const struct drm_connector_funcs intel_lvds_connector_funcs = {
  615.         .dpms = intel_connector_dpms,
  616.         .detect = intel_lvds_detect,
  617.         .fill_modes = drm_helper_probe_single_connector_modes,
  618.         .set_property = intel_lvds_set_property,
  619.         .destroy = intel_lvds_destroy,
  620. };
  621.  
  622. static const struct drm_encoder_funcs intel_lvds_enc_funcs = {
  623.         .destroy = intel_encoder_destroy,
  624. };
  625.  
  626. static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
  627. {
  628.         DRM_INFO("Skipping LVDS initialization for %s\n", id->ident);
  629.         return 1;
  630. }
  631.  
  632. /* These systems claim to have LVDS, but really don't */
  633. static const struct dmi_system_id intel_no_lvds[] = {
  634.         {
  635.                 .callback = intel_no_lvds_dmi_callback,
  636.                 .ident = "Apple Mac Mini (Core series)",
  637.                 .matches = {
  638.                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
  639.                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
  640.                 },
  641.         },
  642.         {
  643.                 .callback = intel_no_lvds_dmi_callback,
  644.                 .ident = "Apple Mac Mini (Core 2 series)",
  645.                 .matches = {
  646.                         DMI_MATCH(DMI_SYS_VENDOR, "Apple"),
  647.                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini2,1"),
  648.                 },
  649.         },
  650.         {
  651.                 .callback = intel_no_lvds_dmi_callback,
  652.                 .ident = "MSI IM-945GSE-A",
  653.                 .matches = {
  654.                         DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
  655.                         DMI_MATCH(DMI_PRODUCT_NAME, "A9830IMS"),
  656.                 },
  657.         },
  658.         {
  659.                 .callback = intel_no_lvds_dmi_callback,
  660.                 .ident = "Dell Studio Hybrid",
  661.                 .matches = {
  662.                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
  663.                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio Hybrid 140g"),
  664.                 },
  665.         },
  666.         {
  667.                 .callback = intel_no_lvds_dmi_callback,
  668.                 .ident = "Dell OptiPlex FX170",
  669.                 .matches = {
  670.                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
  671.                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex FX170"),
  672.                 },
  673.         },
  674.         {
  675.                 .callback = intel_no_lvds_dmi_callback,
  676.                 .ident = "AOpen Mini PC",
  677.                 .matches = {
  678.                         DMI_MATCH(DMI_SYS_VENDOR, "AOpen"),
  679.                         DMI_MATCH(DMI_PRODUCT_NAME, "i965GMx-IF"),
  680.                 },
  681.         },
  682.         {
  683.                 .callback = intel_no_lvds_dmi_callback,
  684.                 .ident = "AOpen Mini PC MP915",
  685.                 .matches = {
  686.                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
  687.                         DMI_MATCH(DMI_BOARD_NAME, "i915GMx-F"),
  688.                 },
  689.         },
  690.         {
  691.                 .callback = intel_no_lvds_dmi_callback,
  692.                 .ident = "AOpen i915GMm-HFS",
  693.                 .matches = {
  694.                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
  695.                         DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
  696.                 },
  697.         },
  698.         {
  699.                 .callback = intel_no_lvds_dmi_callback,
  700.                 .ident = "AOpen i45GMx-I",
  701.                 .matches = {
  702.                         DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
  703.                         DMI_MATCH(DMI_BOARD_NAME, "i45GMx-I"),
  704.                 },
  705.         },
  706.         {
  707.                 .callback = intel_no_lvds_dmi_callback,
  708.                 .ident = "Aopen i945GTt-VFA",
  709.                 .matches = {
  710.                         DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"),
  711.                 },
  712.         },
  713.         {
  714.                 .callback = intel_no_lvds_dmi_callback,
  715.                 .ident = "Clientron U800",
  716.                 .matches = {
  717.                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
  718.                         DMI_MATCH(DMI_PRODUCT_NAME, "U800"),
  719.                 },
  720.         },
  721.         {
  722.                 .callback = intel_no_lvds_dmi_callback,
  723.                 .ident = "Clientron E830",
  724.                 .matches = {
  725.                         DMI_MATCH(DMI_SYS_VENDOR, "Clientron"),
  726.                         DMI_MATCH(DMI_PRODUCT_NAME, "E830"),
  727.                 },
  728.         },
  729.         {
  730.                 .callback = intel_no_lvds_dmi_callback,
  731.                 .ident = "Asus EeeBox PC EB1007",
  732.                 .matches = {
  733.                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
  734.                         DMI_MATCH(DMI_PRODUCT_NAME, "EB1007"),
  735.                 },
  736.         },
  737.         {
  738.                 .callback = intel_no_lvds_dmi_callback,
  739.                 .ident = "Asus AT5NM10T-I",
  740.                 .matches = {
  741.                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
  742.                         DMI_MATCH(DMI_BOARD_NAME, "AT5NM10T-I"),
  743.                 },
  744.         },
  745.         {
  746.                 .callback = intel_no_lvds_dmi_callback,
  747.                 .ident = "Hewlett-Packard HP t5740e Thin Client",
  748.                 .matches = {
  749.                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
  750.                         DMI_MATCH(DMI_PRODUCT_NAME, "HP t5740e Thin Client"),
  751.                 },
  752.         },
  753.         {
  754.                 .callback = intel_no_lvds_dmi_callback,
  755.                 .ident = "Hewlett-Packard t5745",
  756.                 .matches = {
  757.                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
  758.                         DMI_MATCH(DMI_PRODUCT_NAME, "hp t5745"),
  759.                 },
  760.         },
  761.         {
  762.                 .callback = intel_no_lvds_dmi_callback,
  763.                 .ident = "Hewlett-Packard st5747",
  764.                 .matches = {
  765.                         DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
  766.                         DMI_MATCH(DMI_PRODUCT_NAME, "hp st5747"),
  767.                 },
  768.         },
  769.         {
  770.                 .callback = intel_no_lvds_dmi_callback,
  771.                 .ident = "MSI Wind Box DC500",
  772.                 .matches = {
  773.                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
  774.                         DMI_MATCH(DMI_BOARD_NAME, "MS-7469"),
  775.                 },
  776.         },
  777.         {
  778.                 .callback = intel_no_lvds_dmi_callback,
  779.                 .ident = "Gigabyte GA-D525TUD",
  780.                 .matches = {
  781.                         DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
  782.                         DMI_MATCH(DMI_BOARD_NAME, "D525TUD"),
  783.                 },
  784.         },
  785.         {
  786.                 .callback = intel_no_lvds_dmi_callback,
  787.                 .ident = "Supermicro X7SPA-H",
  788.                 .matches = {
  789.                         DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
  790.                         DMI_MATCH(DMI_PRODUCT_NAME, "X7SPA-H"),
  791.                 },
  792.         },
  793.  
  794.         { }     /* terminating entry */
  795. };
  796.  
  797. /**
  798.  * intel_find_lvds_downclock - find the reduced downclock for LVDS in EDID
  799.  * @dev: drm device
  800.  * @connector: LVDS connector
  801.  *
  802.  * Find the reduced downclock for LVDS in EDID.
  803.  */
  804. static void intel_find_lvds_downclock(struct drm_device *dev,
  805.                                       struct drm_display_mode *fixed_mode,
  806.                                       struct drm_connector *connector)
  807. {
  808.         struct drm_i915_private *dev_priv = dev->dev_private;
  809.         struct drm_display_mode *scan;
  810.         int temp_downclock;
  811.  
  812.         temp_downclock = fixed_mode->clock;
  813.         list_for_each_entry(scan, &connector->probed_modes, head) {
  814.                 /*
  815.                  * If one mode has the same resolution with the fixed_panel
  816.                  * mode while they have the different refresh rate, it means
  817.                  * that the reduced downclock is found for the LVDS. In such
  818.                  * case we can set the different FPx0/1 to dynamically select
  819.                  * between low and high frequency.
  820.                  */
  821.                 if (scan->hdisplay == fixed_mode->hdisplay &&
  822.                     scan->hsync_start == fixed_mode->hsync_start &&
  823.                     scan->hsync_end == fixed_mode->hsync_end &&
  824.                     scan->htotal == fixed_mode->htotal &&
  825.                     scan->vdisplay == fixed_mode->vdisplay &&
  826.                     scan->vsync_start == fixed_mode->vsync_start &&
  827.                     scan->vsync_end == fixed_mode->vsync_end &&
  828.                     scan->vtotal == fixed_mode->vtotal) {
  829.                         if (scan->clock < temp_downclock) {
  830.                                 /*
  831.                                  * The downclock is already found. But we
  832.                                  * expect to find the lower downclock.
  833.                                  */
  834.                                 temp_downclock = scan->clock;
  835.                         }
  836.                 }
  837.         }
  838.         if (temp_downclock < fixed_mode->clock && i915_lvds_downclock) {
  839.                 /* We found the downclock for LVDS. */
  840.                 dev_priv->lvds_downclock_avail = 1;
  841.                 dev_priv->lvds_downclock = temp_downclock;
  842.                 DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
  843.                               "Normal clock %dKhz, downclock %dKhz\n",
  844.                               fixed_mode->clock, temp_downclock);
  845.         }
  846. }
  847.  
  848. /*
  849.  * Enumerate the child dev array parsed from VBT to check whether
  850.  * the LVDS is present.
  851.  * If it is present, return 1.
  852.  * If it is not present, return false.
  853.  * If no child dev is parsed from VBT, it assumes that the LVDS is present.
  854.  */
  855. static bool lvds_is_present_in_vbt(struct drm_device *dev,
  856.                                    u8 *i2c_pin)
  857. {
  858.         struct drm_i915_private *dev_priv = dev->dev_private;
  859.         int i;
  860.  
  861.         if (!dev_priv->child_dev_num)
  862.                 return true;
  863.  
  864.         for (i = 0; i < dev_priv->child_dev_num; i++) {
  865.                 struct child_device_config *child = dev_priv->child_dev + i;
  866.  
  867.                 /* If the device type is not LFP, continue.
  868.                  * We have to check both the new identifiers as well as the
  869.                  * old for compatibility with some BIOSes.
  870.                  */
  871.                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
  872.                     child->device_type != DEVICE_TYPE_LFP)
  873.                         continue;
  874.  
  875.                 if (intel_gmbus_is_port_valid(child->i2c_pin))
  876.                     *i2c_pin = child->i2c_pin;
  877.  
  878.                 /* However, we cannot trust the BIOS writers to populate
  879.                  * the VBT correctly.  Since LVDS requires additional
  880.                  * information from AIM blocks, a non-zero addin offset is
  881.                  * a good indicator that the LVDS is actually present.
  882.                  */
  883.                 if (child->addin_offset)
  884.                         return true;
  885.  
  886.                 /* But even then some BIOS writers perform some black magic
  887.                  * and instantiate the device without reference to any
  888.                  * additional data.  Trust that if the VBT was written into
  889.                  * the OpRegion then they have validated the LVDS's existence.
  890.                  */
  891.                 if (dev_priv->opregion.vbt)
  892.                         return true;
  893.         }
  894.  
  895.         return false;
  896. }
  897.  
  898. static bool intel_lvds_supported(struct drm_device *dev)
  899. {
  900.         /* With the introduction of the PCH we gained a dedicated
  901.          * LVDS presence pin, use it. */
  902.         if (HAS_PCH_SPLIT(dev))
  903.                 return true;
  904.  
  905.         /* Otherwise LVDS was only attached to mobile products,
  906.          * except for the inglorious 830gm */
  907.         return IS_MOBILE(dev) && !IS_I830(dev);
  908. }
  909.  
  910. /**
  911.  * intel_lvds_init - setup LVDS connectors on this device
  912.  * @dev: drm device
  913.  *
  914.  * Create the connector, register the LVDS DDC bus, and try to figure out what
  915.  * modes we can display on the LVDS panel (if present).
  916.  */
  917. bool intel_lvds_init(struct drm_device *dev)
  918. {
  919.         struct drm_i915_private *dev_priv = dev->dev_private;
  920.         struct intel_lvds_encoder *lvds_encoder;
  921.         struct intel_encoder *intel_encoder;
  922.         struct intel_lvds_connector *lvds_connector;
  923.         struct intel_connector *intel_connector;
  924.         struct drm_connector *connector;
  925.         struct drm_encoder *encoder;
  926.         struct drm_display_mode *scan; /* *modes, *bios_mode; */
  927.         struct drm_display_mode *fixed_mode = NULL;
  928.         struct edid *edid;
  929.         struct drm_crtc *crtc;
  930.         u32 lvds;
  931.         int pipe;
  932.         u8 pin;
  933.  
  934.         if (!intel_lvds_supported(dev))
  935.                 return false;
  936.  
  937.         /* Skip init on machines we know falsely report LVDS */
  938. //   if (dmi_check_system(intel_no_lvds))
  939. //       return false;
  940.  
  941.         pin = GMBUS_PORT_PANEL;
  942.         if (!lvds_is_present_in_vbt(dev, &pin)) {
  943.                 DRM_DEBUG_KMS("LVDS is not present in VBT\n");
  944.                 return false;
  945.         }
  946.  
  947.         if (HAS_PCH_SPLIT(dev)) {
  948.                 if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
  949.                         return false;
  950.                 if (dev_priv->edp.support) {
  951.                         DRM_DEBUG_KMS("disable LVDS for eDP support\n");
  952.                         return false;
  953.                 }
  954.         }
  955.  
  956.         lvds_encoder = kzalloc(sizeof(struct intel_lvds_encoder), GFP_KERNEL);
  957.         if (!lvds_encoder)
  958.                 return false;
  959.  
  960.         lvds_connector = kzalloc(sizeof(struct intel_lvds_connector), GFP_KERNEL);
  961.         if (!lvds_connector) {
  962.                 kfree(lvds_encoder);
  963.                 return false;
  964.         }
  965.  
  966.         lvds_encoder->attached_connector = lvds_connector;
  967.  
  968.         if (!HAS_PCH_SPLIT(dev)) {
  969.                 lvds_encoder->pfit_control = I915_READ(PFIT_CONTROL);
  970.         }
  971.  
  972.         intel_encoder = &lvds_encoder->base;
  973.         encoder = &intel_encoder->base;
  974.         intel_connector = &lvds_connector->base;
  975.         connector = &intel_connector->base;
  976.         drm_connector_init(dev, &intel_connector->base, &intel_lvds_connector_funcs,
  977.                            DRM_MODE_CONNECTOR_LVDS);
  978.  
  979.         drm_encoder_init(dev, &intel_encoder->base, &intel_lvds_enc_funcs,
  980.                          DRM_MODE_ENCODER_LVDS);
  981.  
  982.         intel_encoder->enable = intel_enable_lvds;
  983.         intel_encoder->disable = intel_disable_lvds;
  984.         intel_encoder->get_hw_state = intel_lvds_get_hw_state;
  985.         intel_connector->get_hw_state = intel_connector_get_hw_state;
  986.  
  987.         intel_connector_attach_encoder(intel_connector, intel_encoder);
  988.         intel_encoder->type = INTEL_OUTPUT_LVDS;
  989.  
  990.         intel_encoder->cloneable = false;
  991.         if (HAS_PCH_SPLIT(dev))
  992.                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
  993.         else if (IS_GEN4(dev))
  994.                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
  995.         else
  996.         intel_encoder->crtc_mask = (1 << 1);
  997.  
  998.         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
  999.         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
  1000.         connector->display_info.subpixel_order = SubPixelHorizontalRGB;
  1001.         connector->interlace_allowed = false;
  1002.         connector->doublescan_allowed = false;
  1003.  
  1004.         /* create the scaling mode property */
  1005.         drm_mode_create_scaling_mode_property(dev);
  1006.         drm_object_attach_property(&connector->base,
  1007.                                       dev->mode_config.scaling_mode_property,
  1008.                                       DRM_MODE_SCALE_ASPECT);
  1009.         intel_connector->panel.fitting_mode = DRM_MODE_SCALE_ASPECT;
  1010.         /*
  1011.          * LVDS discovery:
  1012.          * 1) check for EDID on DDC
  1013.          * 2) check for VBT data
  1014.          * 3) check to see if LVDS is already on
  1015.          *    if none of the above, no panel
  1016.          * 4) make sure lid is open
  1017.          *    if closed, act like it's not there for now
  1018.          */
  1019.  
  1020.         /*
  1021.          * Attempt to get the fixed panel mode from DDC.  Assume that the
  1022.          * preferred mode is the right one.
  1023.          */
  1024.         edid = drm_get_edid(connector, intel_gmbus_get_adapter(dev_priv, pin));
  1025.         if (edid) {
  1026.                 if (drm_add_edid_modes(connector, edid)) {
  1027.                         drm_mode_connector_update_edid_property(connector,
  1028.                                                                 edid);
  1029.                 } else {
  1030.                         kfree(edid);
  1031.                         edid = ERR_PTR(-EINVAL);
  1032.                 }
  1033.         } else {
  1034.                 edid = ERR_PTR(-ENOENT);
  1035.         }
  1036.         lvds_connector->base.edid = edid;
  1037.  
  1038.         if (IS_ERR_OR_NULL(edid)) {
  1039.                 /* Didn't get an EDID, so
  1040.                  * Set wide sync ranges so we get all modes
  1041.                  * handed to valid_mode for checking
  1042.                  */
  1043.                 connector->display_info.min_vfreq = 0;
  1044.                 connector->display_info.max_vfreq = 200;
  1045.                 connector->display_info.min_hfreq = 0;
  1046.                 connector->display_info.max_hfreq = 200;
  1047.         }
  1048.  
  1049.         list_for_each_entry(scan, &connector->probed_modes, head) {
  1050.                 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
  1051.                         DRM_DEBUG_KMS("using preferred mode from EDID: ");
  1052.                         drm_mode_debug_printmodeline(scan);
  1053.  
  1054.                         fixed_mode = drm_mode_duplicate(dev, scan);
  1055.                         if (fixed_mode) {
  1056.                                 intel_find_lvds_downclock(dev, fixed_mode,
  1057.                                                   connector);
  1058.                         goto out;
  1059.                 }
  1060.         }
  1061.         }
  1062.  
  1063.         /* Failed to get EDID, what about VBT? */
  1064.         if (dev_priv->lfp_lvds_vbt_mode) {
  1065.                 DRM_DEBUG_KMS("using mode from VBT: ");
  1066.                 drm_mode_debug_printmodeline(dev_priv->lfp_lvds_vbt_mode);
  1067.  
  1068.                 fixed_mode = drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
  1069.                 if (fixed_mode) {
  1070.                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
  1071.                         goto out;
  1072.                 }
  1073.         }
  1074.  
  1075.         /*
  1076.          * If we didn't get EDID, try checking if the panel is already turned
  1077.          * on.  If so, assume that whatever is currently programmed is the
  1078.          * correct mode.
  1079.          */
  1080.  
  1081.         /* Ironlake: FIXME if still fail, not try pipe mode now */
  1082.         if (HAS_PCH_SPLIT(dev))
  1083.                 goto failed;
  1084.  
  1085.         lvds = I915_READ(LVDS);
  1086.         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
  1087.         crtc = intel_get_crtc_for_pipe(dev, pipe);
  1088.  
  1089.         if (crtc && (lvds & LVDS_PORT_EN)) {
  1090.                 fixed_mode = intel_crtc_mode_get(dev, crtc);
  1091.                 if (fixed_mode) {
  1092.                         DRM_DEBUG_KMS("using current (BIOS) mode: ");
  1093.                         drm_mode_debug_printmodeline(fixed_mode);
  1094.                         fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
  1095.                         goto out;
  1096.                 }
  1097.         }
  1098.  
  1099.         /* If we still don't have a mode after all that, give up. */
  1100.         if (!fixed_mode)
  1101.                 goto failed;
  1102.  
  1103. out:
  1104.                 /*
  1105.                  * Unlock registers and just
  1106.                  * leave them unlocked
  1107.                  */
  1108.         if (HAS_PCH_SPLIT(dev)) {
  1109.                 I915_WRITE(PCH_PP_CONTROL,
  1110.                            I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
  1111.         } else {
  1112.                 I915_WRITE(PP_CONTROL,
  1113.                            I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
  1114.         }
  1115. //   dev_priv->lid_notifier.notifier_call = intel_lid_notify;
  1116. //   if (acpi_lid_notifier_register(&dev_priv->lid_notifier)) {
  1117. //       DRM_DEBUG_KMS("lid notifier registration failed\n");
  1118.  //      dev_priv->lid_notifier.notifier_call = NULL;
  1119. //   }
  1120.         drm_sysfs_connector_add(connector);
  1121.  
  1122.         intel_panel_init(&intel_connector->panel, fixed_mode);
  1123.         intel_panel_setup_backlight(connector);
  1124.  
  1125.         return true;
  1126.  
  1127. failed:
  1128.         DRM_DEBUG_KMS("No LVDS modes found, disabling.\n");
  1129.         drm_connector_cleanup(connector);
  1130.         drm_encoder_cleanup(encoder);
  1131.         if (fixed_mode)
  1132.                 drm_mode_destroy(dev, fixed_mode);
  1133.         kfree(lvds_encoder);
  1134.         kfree(lvds_connector);
  1135.         return false;
  1136. }
  1137.