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  1. /*
  2.  * Copyright © 2006 Intel Corporation
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person obtaining a
  5.  * copy of this software and associated documentation files (the "Software"),
  6.  * to deal in the Software without restriction, including without limitation
  7.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8.  * and/or sell copies of the Software, and to permit persons to whom the
  9.  * Software is furnished to do so, subject to the following conditions:
  10.  *
  11.  * The above copyright notice and this permission notice (including the next
  12.  * paragraph) shall be included in all copies or substantial portions of the
  13.  * Software.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20.  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21.  * SOFTWARE.
  22.  *
  23.  * Authors:
  24.  *    Eric Anholt <eric@anholt.net>
  25.  *
  26.  */
  27. #include <drm/drm_dp_helper.h>
  28. #include "drmP.h"
  29. #include "drm.h"
  30. //#include "i915_drm.h"
  31. #include "i915_drv.h"
  32. #include "intel_bios.h"
  33.  
  34. #include <syscall.h>
  35.  
  36. #define SLAVE_ADDR1     0x70
  37. #define SLAVE_ADDR2     0x72
  38.  
  39. static int panel_type;
  40.  
  41. static void *
  42. find_section(struct bdb_header *bdb, int section_id)
  43. {
  44.         u8 *base = (u8 *)bdb;
  45.         int index = 0;
  46.         u16 total, current_size;
  47.         u8 current_id;
  48.  
  49.         /* skip to first section */
  50.         index += bdb->header_size;
  51.         total = bdb->bdb_size;
  52.  
  53.         /* walk the sections looking for section_id */
  54.         while (index < total) {
  55.                 current_id = *(base + index);
  56.                 index++;
  57.                 current_size = *((u16 *)(base + index));
  58.                 index += 2;
  59.                 if (current_id == section_id)
  60.                         return base + index;
  61.                 index += current_size;
  62.         }
  63.  
  64.         return NULL;
  65. }
  66.  
  67. static u16
  68. get_blocksize(void *p)
  69. {
  70.         u16 *block_ptr, block_size;
  71.  
  72.         block_ptr = (u16 *)((char *)p - 2);
  73.         block_size = *block_ptr;
  74.         return block_size;
  75. }
  76.  
  77. static void
  78. fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
  79.                         const struct lvds_dvo_timing *dvo_timing)
  80. {
  81.         panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
  82.                 dvo_timing->hactive_lo;
  83.         panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
  84.                 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
  85.         panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
  86.                 dvo_timing->hsync_pulse_width;
  87.         panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
  88.                 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
  89.  
  90.         panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
  91.                 dvo_timing->vactive_lo;
  92.         panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
  93.                 dvo_timing->vsync_off;
  94.         panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
  95.                 dvo_timing->vsync_pulse_width;
  96.         panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
  97.                 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
  98.         panel_fixed_mode->clock = dvo_timing->clock * 10;
  99.         panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
  100.  
  101.         if (dvo_timing->hsync_positive)
  102.                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
  103.         else
  104.                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
  105.  
  106.         if (dvo_timing->vsync_positive)
  107.                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
  108.         else
  109.                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
  110.  
  111.         /* Some VBTs have bogus h/vtotal values */
  112.         if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
  113.                 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
  114.         if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
  115.                 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
  116.  
  117.         drm_mode_set_name(panel_fixed_mode);
  118. }
  119.  
  120. static bool
  121. lvds_dvo_timing_equal_size(const struct lvds_dvo_timing *a,
  122.                            const struct lvds_dvo_timing *b)
  123. {
  124.         if (a->hactive_hi != b->hactive_hi ||
  125.             a->hactive_lo != b->hactive_lo)
  126.                 return false;
  127.  
  128.         if (a->hsync_off_hi != b->hsync_off_hi ||
  129.             a->hsync_off_lo != b->hsync_off_lo)
  130.                 return false;
  131.  
  132.         if (a->hsync_pulse_width != b->hsync_pulse_width)
  133.                 return false;
  134.  
  135.         if (a->hblank_hi != b->hblank_hi ||
  136.             a->hblank_lo != b->hblank_lo)
  137.                 return false;
  138.  
  139.         if (a->vactive_hi != b->vactive_hi ||
  140.             a->vactive_lo != b->vactive_lo)
  141.                 return false;
  142.  
  143.         if (a->vsync_off != b->vsync_off)
  144.                 return false;
  145.  
  146.         if (a->vsync_pulse_width != b->vsync_pulse_width)
  147.                 return false;
  148.  
  149.         if (a->vblank_hi != b->vblank_hi ||
  150.             a->vblank_lo != b->vblank_lo)
  151.                 return false;
  152.  
  153.         return true;
  154. }
  155.  
  156. static const struct lvds_dvo_timing *
  157. get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data,
  158.                     const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs,
  159.                     int index)
  160. {
  161.         /*
  162.          * the size of fp_timing varies on the different platform.
  163.          * So calculate the DVO timing relative offset in LVDS data
  164.          * entry to get the DVO timing entry
  165.          */
  166.  
  167.         int lfp_data_size =
  168.                 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
  169.                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
  170.         int dvo_timing_offset =
  171.                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
  172.                 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
  173.         char *entry = (char *)lvds_lfp_data->data + lfp_data_size * index;
  174.  
  175.         return (struct lvds_dvo_timing *)(entry + dvo_timing_offset);
  176. }
  177.  
  178. /* Try to find integrated panel data */
  179. static void
  180. parse_lfp_panel_data(struct drm_i915_private *dev_priv,
  181.                             struct bdb_header *bdb)
  182. {
  183.         const struct bdb_lvds_options *lvds_options;
  184.         const struct bdb_lvds_lfp_data *lvds_lfp_data;
  185.         const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
  186.         const struct lvds_dvo_timing *panel_dvo_timing;
  187.         struct drm_display_mode *panel_fixed_mode;
  188.         int i, downclock;
  189.  
  190.         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
  191.         if (!lvds_options)
  192.                 return;
  193.  
  194.         dev_priv->lvds_dither = lvds_options->pixel_dither;
  195.         if (lvds_options->panel_type == 0xff)
  196.                 return;
  197.  
  198.         panel_type = lvds_options->panel_type;
  199.  
  200.         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
  201.         if (!lvds_lfp_data)
  202.                 return;
  203.  
  204.         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
  205.         if (!lvds_lfp_data_ptrs)
  206.                 return;
  207.  
  208.         dev_priv->lvds_vbt = 1;
  209.  
  210.         panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
  211.                                                lvds_lfp_data_ptrs,
  212.                                                lvds_options->panel_type);
  213.  
  214.         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
  215.         if (!panel_fixed_mode)
  216.                 return;
  217.  
  218.         fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
  219.  
  220.         dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
  221.  
  222.         DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
  223.         drm_mode_debug_printmodeline(panel_fixed_mode);
  224.  
  225.         /*
  226.          * Iterate over the LVDS panel timing info to find the lowest clock
  227.          * for the native resolution.
  228.          */
  229.         downclock = panel_dvo_timing->clock;
  230.         for (i = 0; i < 16; i++) {
  231.                 const struct lvds_dvo_timing *dvo_timing;
  232.  
  233.                 dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
  234.                                                  lvds_lfp_data_ptrs,
  235.                                                  i);
  236.                 if (lvds_dvo_timing_equal_size(dvo_timing, panel_dvo_timing) &&
  237.                     dvo_timing->clock < downclock)
  238.                         downclock = dvo_timing->clock;
  239.         }
  240.  
  241.         if (downclock < panel_dvo_timing->clock && i915_lvds_downclock) {
  242.                 dev_priv->lvds_downclock_avail = 1;
  243.                 dev_priv->lvds_downclock = downclock * 10;
  244.                 DRM_DEBUG_KMS("LVDS downclock is found in VBT. "
  245.                               "Normal Clock %dKHz, downclock %dKHz\n",
  246.                               panel_fixed_mode->clock, 10*downclock);
  247.         }
  248. }
  249.  
  250. /* Try to find sdvo panel data */
  251. static void
  252. parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
  253.                       struct bdb_header *bdb)
  254. {
  255.         struct lvds_dvo_timing *dvo_timing;
  256.         struct drm_display_mode *panel_fixed_mode;
  257.         int index;
  258.  
  259.         index = i915_vbt_sdvo_panel_type;
  260.         if (index == -1) {
  261.                 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
  262.  
  263.                 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
  264.                 if (!sdvo_lvds_options)
  265.                         return;
  266.  
  267.                 index = sdvo_lvds_options->panel_type;
  268.         }
  269.  
  270.         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
  271.         if (!dvo_timing)
  272.                 return;
  273.  
  274.         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
  275.         if (!panel_fixed_mode)
  276.                 return;
  277.  
  278.         fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
  279.  
  280.         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
  281.  
  282.         DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
  283.         drm_mode_debug_printmodeline(panel_fixed_mode);
  284. }
  285.  
  286. static int intel_bios_ssc_frequency(struct drm_device *dev,
  287.                                     bool alternate)
  288. {
  289.         switch (INTEL_INFO(dev)->gen) {
  290.         case 2:
  291.                 return alternate ? 66 : 48;
  292.         case 3:
  293.         case 4:
  294.                 return alternate ? 100 : 96;
  295.         default:
  296.                 return alternate ? 100 : 120;
  297.         }
  298. }
  299.  
  300. static void
  301. parse_general_features(struct drm_i915_private *dev_priv,
  302.                        struct bdb_header *bdb)
  303. {
  304.         struct drm_device *dev = dev_priv->dev;
  305.         struct bdb_general_features *general;
  306.  
  307.         general = find_section(bdb, BDB_GENERAL_FEATURES);
  308.         if (general) {
  309.                 dev_priv->int_tv_support = general->int_tv_support;
  310.                 dev_priv->int_crt_support = general->int_crt_support;
  311.                 dev_priv->lvds_use_ssc = general->enable_ssc;
  312.                 dev_priv->lvds_ssc_freq =
  313.                         intel_bios_ssc_frequency(dev, general->ssc_freq);
  314.         }
  315. }
  316.  
  317. static void
  318. parse_general_definitions(struct drm_i915_private *dev_priv,
  319.                           struct bdb_header *bdb)
  320. {
  321.         struct bdb_general_definitions *general;
  322.  
  323.         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
  324.         if (general) {
  325.                 u16 block_size = get_blocksize(general);
  326.                 if (block_size >= sizeof(*general)) {
  327.                         int bus_pin = general->crt_ddc_gmbus_pin;
  328.                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
  329.                         if (bus_pin >= 1 && bus_pin <= 6)
  330.                                 dev_priv->crt_ddc_pin = bus_pin;
  331.                 } else {
  332.                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
  333.                                   block_size);
  334.                 }
  335.         }
  336. }
  337.  
  338. static void
  339. parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
  340.                           struct bdb_header *bdb)
  341. {
  342.         struct sdvo_device_mapping *p_mapping;
  343.         struct bdb_general_definitions *p_defs;
  344.         struct child_device_config *p_child;
  345.         int i, child_device_num, count;
  346.         u16     block_size;
  347.  
  348.         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
  349.         if (!p_defs) {
  350.                 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
  351.                 return;
  352.         }
  353.         /* judge whether the size of child device meets the requirements.
  354.          * If the child device size obtained from general definition block
  355.          * is different with sizeof(struct child_device_config), skip the
  356.          * parsing of sdvo device info
  357.          */
  358.         if (p_defs->child_dev_size != sizeof(*p_child)) {
  359.                 /* different child dev size . Ignore it */
  360.                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
  361.                 return;
  362.         }
  363.         /* get the block size of general definitions */
  364.         block_size = get_blocksize(p_defs);
  365.         /* get the number of child device */
  366.         child_device_num = (block_size - sizeof(*p_defs)) /
  367.                                 sizeof(*p_child);
  368.         count = 0;
  369.         for (i = 0; i < child_device_num; i++) {
  370.                 p_child = &(p_defs->devices[i]);
  371.                 if (!p_child->device_type) {
  372.                         /* skip the device block if device type is invalid */
  373.                         continue;
  374.                 }
  375.                 if (p_child->slave_addr != SLAVE_ADDR1 &&
  376.                         p_child->slave_addr != SLAVE_ADDR2) {
  377.                         /*
  378.                          * If the slave address is neither 0x70 nor 0x72,
  379.                          * it is not a SDVO device. Skip it.
  380.                          */
  381.                         continue;
  382.                 }
  383.                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
  384.                         p_child->dvo_port != DEVICE_PORT_DVOC) {
  385.                         /* skip the incorrect SDVO port */
  386.                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it \n");
  387.                         continue;
  388.                 }
  389.                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
  390.                                 " %s port\n",
  391.                                 p_child->slave_addr,
  392.                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
  393.                                         "SDVOB" : "SDVOC");
  394.                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
  395.                 if (!p_mapping->initialized) {
  396.                         p_mapping->dvo_port = p_child->dvo_port;
  397.                         p_mapping->slave_addr = p_child->slave_addr;
  398.                         p_mapping->dvo_wiring = p_child->dvo_wiring;
  399.                         p_mapping->ddc_pin = p_child->ddc_pin;
  400.                         p_mapping->i2c_pin = p_child->i2c_pin;
  401.                         p_mapping->i2c_speed = p_child->i2c_speed;
  402.                         p_mapping->initialized = 1;
  403.                         DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d, i2c_speed=%d\n",
  404.                                       p_mapping->dvo_port,
  405.                                       p_mapping->slave_addr,
  406.                                       p_mapping->dvo_wiring,
  407.                                       p_mapping->ddc_pin,
  408.                                       p_mapping->i2c_pin,
  409.                                       p_mapping->i2c_speed);
  410.                 } else {
  411.                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
  412.                                          "two SDVO device.\n");
  413.                 }
  414.                 if (p_child->slave2_addr) {
  415.                         /* Maybe this is a SDVO device with multiple inputs */
  416.                         /* And the mapping info is not added */
  417.                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
  418.                                 " is a SDVO device with multiple inputs.\n");
  419.                 }
  420.                 count++;
  421.         }
  422.  
  423.         if (!count) {
  424.                 /* No SDVO device info is found */
  425.                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
  426.         }
  427.         return;
  428. }
  429.  
  430. static void
  431. parse_driver_features(struct drm_i915_private *dev_priv,
  432.                        struct bdb_header *bdb)
  433. {
  434.         struct drm_device *dev = dev_priv->dev;
  435.         struct bdb_driver_features *driver;
  436.  
  437.         driver = find_section(bdb, BDB_DRIVER_FEATURES);
  438.         if (!driver)
  439.                 return;
  440.  
  441.         if (SUPPORTS_EDP(dev) &&
  442.             driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
  443.                 dev_priv->edp.support = 1;
  444.  
  445.         if (driver->dual_frequency)
  446.                 dev_priv->render_reclock_avail = true;
  447. }
  448.  
  449. static void
  450. parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
  451. {
  452.         struct bdb_edp *edp;
  453.         struct edp_power_seq *edp_pps;
  454.         struct edp_link_params *edp_link_params;
  455.  
  456.         edp = find_section(bdb, BDB_EDP);
  457.         if (!edp) {
  458.                 if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->edp.support) {
  459.                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel "
  460.                                       "supported, assume %dbpp panel color "
  461.                                       "depth.\n",
  462.                                       dev_priv->edp.bpp);
  463.                 }
  464.                 return;
  465.         }
  466.  
  467.         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
  468.         case EDP_18BPP:
  469.                 dev_priv->edp.bpp = 18;
  470.                 break;
  471.         case EDP_24BPP:
  472.                 dev_priv->edp.bpp = 24;
  473.                 break;
  474.         case EDP_30BPP:
  475.                 dev_priv->edp.bpp = 30;
  476.                 break;
  477.         }
  478.  
  479.         /* Get the eDP sequencing and link info */
  480.         edp_pps = &edp->power_seqs[panel_type];
  481.         edp_link_params = &edp->link_params[panel_type];
  482.  
  483.         dev_priv->edp.pps = *edp_pps;
  484.  
  485.         dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
  486.                 DP_LINK_BW_1_62;
  487.         switch (edp_link_params->lanes) {
  488.         case 0:
  489.                 dev_priv->edp.lanes = 1;
  490.                 break;
  491.         case 1:
  492.                 dev_priv->edp.lanes = 2;
  493.                 break;
  494.         case 3:
  495.         default:
  496.                 dev_priv->edp.lanes = 4;
  497.                 break;
  498.         }
  499.         switch (edp_link_params->preemphasis) {
  500.         case 0:
  501.                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
  502.                 break;
  503.         case 1:
  504.                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
  505.                 break;
  506.         case 2:
  507.                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
  508.                 break;
  509.         case 3:
  510.                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
  511.                 break;
  512.         }
  513.         switch (edp_link_params->vswing) {
  514.         case 0:
  515.                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_400;
  516.                 break;
  517.         case 1:
  518.                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_600;
  519.                 break;
  520.         case 2:
  521.                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_800;
  522.                 break;
  523.         case 3:
  524.                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_1200;
  525.                 break;
  526.         }
  527. }
  528.  
  529. static void
  530. parse_device_mapping(struct drm_i915_private *dev_priv,
  531.                        struct bdb_header *bdb)
  532. {
  533.         struct bdb_general_definitions *p_defs;
  534.         struct child_device_config *p_child, *child_dev_ptr;
  535.         int i, child_device_num, count;
  536.         u16     block_size;
  537.  
  538.         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
  539.         if (!p_defs) {
  540.                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
  541.                 return;
  542.         }
  543.         /* judge whether the size of child device meets the requirements.
  544.          * If the child device size obtained from general definition block
  545.          * is different with sizeof(struct child_device_config), skip the
  546.          * parsing of sdvo device info
  547.          */
  548.         if (p_defs->child_dev_size != sizeof(*p_child)) {
  549.                 /* different child dev size . Ignore it */
  550.                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
  551.                 return;
  552.         }
  553.         /* get the block size of general definitions */
  554.         block_size = get_blocksize(p_defs);
  555.         /* get the number of child device */
  556.         child_device_num = (block_size - sizeof(*p_defs)) /
  557.                                 sizeof(*p_child);
  558.         count = 0;
  559.         /* get the number of child device that is present */
  560.         for (i = 0; i < child_device_num; i++) {
  561.                 p_child = &(p_defs->devices[i]);
  562.                 if (!p_child->device_type) {
  563.                         /* skip the device block if device type is invalid */
  564.                         continue;
  565.                 }
  566.                 count++;
  567.         }
  568.         if (!count) {
  569.                 DRM_DEBUG_KMS("no child dev is parsed from VBT \n");
  570.                 return;
  571.         }
  572.         dev_priv->child_dev = kzalloc(sizeof(*p_child) * count, GFP_KERNEL);
  573.         if (!dev_priv->child_dev) {
  574.                 DRM_DEBUG_KMS("No memory space for child device\n");
  575.                 return;
  576.         }
  577.  
  578.         dev_priv->child_dev_num = count;
  579.         count = 0;
  580.         for (i = 0; i < child_device_num; i++) {
  581.                 p_child = &(p_defs->devices[i]);
  582.                 if (!p_child->device_type) {
  583.                         /* skip the device block if device type is invalid */
  584.                         continue;
  585.                 }
  586.                 child_dev_ptr = dev_priv->child_dev + count;
  587.                 count++;
  588.                 memcpy((void *)child_dev_ptr, (void *)p_child,
  589.                                         sizeof(*p_child));
  590.         }
  591.         return;
  592. }
  593.  
  594. static void
  595. init_vbt_defaults(struct drm_i915_private *dev_priv)
  596. {
  597.         struct drm_device *dev = dev_priv->dev;
  598.  
  599.         dev_priv->crt_ddc_pin = GMBUS_PORT_VGADDC;
  600.  
  601.         /* LFP panel data */
  602.         dev_priv->lvds_dither = 1;
  603.         dev_priv->lvds_vbt = 0;
  604.  
  605.         /* SDVO panel data */
  606.         dev_priv->sdvo_lvds_vbt_mode = NULL;
  607.  
  608.         /* general features */
  609.         dev_priv->int_tv_support = 1;
  610.         dev_priv->int_crt_support = 1;
  611.  
  612.         /* Default to using SSC */
  613.         dev_priv->lvds_use_ssc = 1;
  614.         dev_priv->lvds_ssc_freq = intel_bios_ssc_frequency(dev, 1);
  615.         DRM_DEBUG("Set default to SSC at %dMHz\n", dev_priv->lvds_ssc_freq);
  616.  
  617.         /* eDP data */
  618.         dev_priv->edp.bpp = 18;
  619. }
  620.  
  621. /**
  622.  * intel_parse_bios - find VBT and initialize settings from the BIOS
  623.  * @dev: DRM device
  624.  *
  625.  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
  626.  * to appropriate values.
  627.  *
  628.  * Returns 0 on success, nonzero on failure.
  629.  */
  630. bool
  631. intel_parse_bios(struct drm_device *dev)
  632. {
  633.         struct drm_i915_private *dev_priv = dev->dev_private;
  634.         struct pci_dev *pdev = dev->pdev;
  635.         struct bdb_header *bdb = NULL;
  636.         u8 __iomem *bios = NULL;
  637.  
  638.     ENTER();
  639.  
  640.         init_vbt_defaults(dev_priv);
  641.  
  642.     /* XXX Should this validation be moved to intel_opregion.c? */
  643.         if (dev_priv->opregion.vbt) {
  644.                 struct vbt_header *vbt = dev_priv->opregion.vbt;
  645.                 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
  646.                         DRM_DEBUG_DRIVER("Using VBT from OpRegion: %20s\n",
  647.                                          vbt->signature);
  648.                         bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
  649.                 } else
  650.                         dev_priv->opregion.vbt = NULL;
  651.         }
  652.  
  653.         if (bdb == NULL) {
  654.                 struct vbt_header *vbt = NULL;
  655.                 size_t size;
  656.                 int i;
  657.  
  658.                 bios = pci_map_rom(pdev, &size);
  659.                 if (!bios)
  660.                         return -1;
  661.  
  662.                 /* Scour memory looking for the VBT signature */
  663.                 for (i = 0; i + 4 < size; i++) {
  664.                         if (!memcmp(bios + i, "$VBT", 4)) {
  665.                                 vbt = (struct vbt_header *)(bios + i);
  666.                                 break;
  667.                         }
  668.                 }
  669.  
  670.                 if (!vbt) {
  671.                         DRM_ERROR("VBT signature missing\n");
  672.             pci_unmap_rom(pdev, bios);
  673.                         return -1;
  674.                 }
  675.  
  676.                 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
  677.         }
  678.  
  679.         /* Grab useful general definitions */
  680.     parse_general_features(dev_priv, bdb);
  681.     parse_general_definitions(dev_priv, bdb);
  682.     parse_lfp_panel_data(dev_priv, bdb);
  683.     parse_sdvo_panel_data(dev_priv, bdb);
  684.     parse_sdvo_device_mapping(dev_priv, bdb);
  685.     parse_device_mapping(dev_priv, bdb);
  686.     parse_driver_features(dev_priv, bdb);
  687.     parse_edp(dev_priv, bdb);
  688.  
  689.     if (bios)
  690.         pci_unmap_rom(pdev, bios);
  691.  
  692.     LEAVE();
  693.  
  694.         return 0;
  695. }
  696.  
  697. /* Ensure that vital registers have been initialised, even if the BIOS
  698.  * is absent or just failing to do its job.
  699.  */
  700. void intel_setup_bios(struct drm_device *dev)
  701. {
  702.         struct drm_i915_private *dev_priv = dev->dev_private;
  703.  
  704.          /* Set the Panel Power On/Off timings if uninitialized. */
  705.         if ((I915_READ(PP_ON_DELAYS) == 0) && (I915_READ(PP_OFF_DELAYS) == 0)) {
  706.                 /* Set T2 to 40ms and T5 to 200ms */
  707.                 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
  708.  
  709.                 /* Set T3 to 35ms and Tx to 200ms */
  710.                 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
  711.         }
  712. }
  713.