Subversion Repositories Kolibri OS

Rev

Rev 2327 | Rev 2338 | Go to most recent revision | Blame | Compare with Previous | Last modification | View Log | Download | RSS feed

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