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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. #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.                 dev_priv->display_clock_mode = general->display_clock_mode;
  313.                 DRM_DEBUG_KMS("BDB_GENERAL_FEATURES int_tv_support %d int_crt_support %d lvds_use_ssc %d lvds_ssc_freq %d display_clock_mode %d\n",
  314.                               dev_priv->int_tv_support,
  315.                               dev_priv->int_crt_support,
  316.                               dev_priv->lvds_use_ssc,
  317.                               dev_priv->lvds_ssc_freq,
  318.                               dev_priv->display_clock_mode);
  319.         }
  320. }
  321.  
  322. static void
  323. parse_general_definitions(struct drm_i915_private *dev_priv,
  324.                           struct bdb_header *bdb)
  325. {
  326.         struct bdb_general_definitions *general;
  327.  
  328.         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
  329.         if (general) {
  330.                 u16 block_size = get_blocksize(general);
  331.                 if (block_size >= sizeof(*general)) {
  332.                         int bus_pin = general->crt_ddc_gmbus_pin;
  333.                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
  334.                         if (bus_pin >= 1 && bus_pin <= 6)
  335.                                 dev_priv->crt_ddc_pin = bus_pin;
  336.                 } else {
  337.                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
  338.                                   block_size);
  339.                 }
  340.         }
  341. }
  342.  
  343. static void
  344. parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
  345.                           struct bdb_header *bdb)
  346. {
  347.         struct sdvo_device_mapping *p_mapping;
  348.         struct bdb_general_definitions *p_defs;
  349.         struct child_device_config *p_child;
  350.         int i, child_device_num, count;
  351.         u16     block_size;
  352.  
  353.         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
  354.         if (!p_defs) {
  355.                 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
  356.                 return;
  357.         }
  358.         /* judge whether the size of child device meets the requirements.
  359.          * If the child device size obtained from general definition block
  360.          * is different with sizeof(struct child_device_config), skip the
  361.          * parsing of sdvo device info
  362.          */
  363.         if (p_defs->child_dev_size != sizeof(*p_child)) {
  364.                 /* different child dev size . Ignore it */
  365.                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
  366.                 return;
  367.         }
  368.         /* get the block size of general definitions */
  369.         block_size = get_blocksize(p_defs);
  370.         /* get the number of child device */
  371.         child_device_num = (block_size - sizeof(*p_defs)) /
  372.                                 sizeof(*p_child);
  373.         count = 0;
  374.         for (i = 0; i < child_device_num; i++) {
  375.                 p_child = &(p_defs->devices[i]);
  376.                 if (!p_child->device_type) {
  377.                         /* skip the device block if device type is invalid */
  378.                         continue;
  379.                 }
  380.                 if (p_child->slave_addr != SLAVE_ADDR1 &&
  381.                         p_child->slave_addr != SLAVE_ADDR2) {
  382.                         /*
  383.                          * If the slave address is neither 0x70 nor 0x72,
  384.                          * it is not a SDVO device. Skip it.
  385.                          */
  386.                         continue;
  387.                 }
  388.                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
  389.                         p_child->dvo_port != DEVICE_PORT_DVOC) {
  390.                         /* skip the incorrect SDVO port */
  391.                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
  392.                         continue;
  393.                 }
  394.                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
  395.                                 " %s port\n",
  396.                                 p_child->slave_addr,
  397.                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
  398.                                         "SDVOB" : "SDVOC");
  399.                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
  400.                 if (!p_mapping->initialized) {
  401.                         p_mapping->dvo_port = p_child->dvo_port;
  402.                         p_mapping->slave_addr = p_child->slave_addr;
  403.                         p_mapping->dvo_wiring = p_child->dvo_wiring;
  404.                         p_mapping->ddc_pin = p_child->ddc_pin;
  405.                         p_mapping->i2c_pin = p_child->i2c_pin;
  406.                         p_mapping->initialized = 1;
  407.                         DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
  408.                                       p_mapping->dvo_port,
  409.                                       p_mapping->slave_addr,
  410.                                       p_mapping->dvo_wiring,
  411.                                       p_mapping->ddc_pin,
  412.                                       p_mapping->i2c_pin);
  413.                 } else {
  414.                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
  415.                                          "two SDVO device.\n");
  416.                 }
  417.                 if (p_child->slave2_addr) {
  418.                         /* Maybe this is a SDVO device with multiple inputs */
  419.                         /* And the mapping info is not added */
  420.                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
  421.                                 " is a SDVO device with multiple inputs.\n");
  422.                 }
  423.                 count++;
  424.         }
  425.  
  426.         if (!count) {
  427.                 /* No SDVO device info is found */
  428.                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
  429.         }
  430.         return;
  431. }
  432.  
  433. static void
  434. parse_driver_features(struct drm_i915_private *dev_priv,
  435.                        struct bdb_header *bdb)
  436. {
  437.         struct drm_device *dev = dev_priv->dev;
  438.         struct bdb_driver_features *driver;
  439.  
  440.         driver = find_section(bdb, BDB_DRIVER_FEATURES);
  441.         if (!driver)
  442.                 return;
  443.  
  444.         if (SUPPORTS_EDP(dev) &&
  445.             driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
  446.                 dev_priv->edp.support = 1;
  447.  
  448.         if (driver->dual_frequency)
  449.                 dev_priv->render_reclock_avail = true;
  450. }
  451.  
  452. static void
  453. parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
  454. {
  455.         struct bdb_edp *edp;
  456.         struct edp_power_seq *edp_pps;
  457.         struct edp_link_params *edp_link_params;
  458.  
  459.         edp = find_section(bdb, BDB_EDP);
  460.         if (!edp) {
  461.                 if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->edp.support) {
  462.                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel "
  463.                                       "supported, assume %dbpp panel color "
  464.                                       "depth.\n",
  465.                                       dev_priv->edp.bpp);
  466.                 }
  467.                 return;
  468.         }
  469.  
  470.         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
  471.         case EDP_18BPP:
  472.                 dev_priv->edp.bpp = 18;
  473.                 break;
  474.         case EDP_24BPP:
  475.                 dev_priv->edp.bpp = 24;
  476.                 break;
  477.         case EDP_30BPP:
  478.                 dev_priv->edp.bpp = 30;
  479.                 break;
  480.         }
  481.  
  482.         /* Get the eDP sequencing and link info */
  483.         edp_pps = &edp->power_seqs[panel_type];
  484.         edp_link_params = &edp->link_params[panel_type];
  485.  
  486.         dev_priv->edp.pps = *edp_pps;
  487.  
  488.         dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
  489.                 DP_LINK_BW_1_62;
  490.         switch (edp_link_params->lanes) {
  491.         case 0:
  492.                 dev_priv->edp.lanes = 1;
  493.                 break;
  494.         case 1:
  495.                 dev_priv->edp.lanes = 2;
  496.                 break;
  497.         case 3:
  498.         default:
  499.                 dev_priv->edp.lanes = 4;
  500.                 break;
  501.         }
  502.         switch (edp_link_params->preemphasis) {
  503.         case 0:
  504.                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
  505.                 break;
  506.         case 1:
  507.                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
  508.                 break;
  509.         case 2:
  510.                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
  511.                 break;
  512.         case 3:
  513.                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
  514.                 break;
  515.         }
  516.         switch (edp_link_params->vswing) {
  517.         case 0:
  518.                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_400;
  519.                 break;
  520.         case 1:
  521.                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_600;
  522.                 break;
  523.         case 2:
  524.                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_800;
  525.                 break;
  526.         case 3:
  527.                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_1200;
  528.                 break;
  529.         }
  530. }
  531.  
  532. static void
  533. parse_device_mapping(struct drm_i915_private *dev_priv,
  534.                        struct bdb_header *bdb)
  535. {
  536.         struct bdb_general_definitions *p_defs;
  537.         struct child_device_config *p_child, *child_dev_ptr;
  538.         int i, child_device_num, count;
  539.         u16     block_size;
  540.  
  541.         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
  542.         if (!p_defs) {
  543.                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
  544.                 return;
  545.         }
  546.         /* judge whether the size of child device meets the requirements.
  547.          * If the child device size obtained from general definition block
  548.          * is different with sizeof(struct child_device_config), skip the
  549.          * parsing of sdvo device info
  550.          */
  551.         if (p_defs->child_dev_size != sizeof(*p_child)) {
  552.                 /* different child dev size . Ignore it */
  553.                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
  554.                 return;
  555.         }
  556.         /* get the block size of general definitions */
  557.         block_size = get_blocksize(p_defs);
  558.         /* get the number of child device */
  559.         child_device_num = (block_size - sizeof(*p_defs)) /
  560.                                 sizeof(*p_child);
  561.         count = 0;
  562.         /* get the number of child device that is present */
  563.         for (i = 0; i < child_device_num; i++) {
  564.                 p_child = &(p_defs->devices[i]);
  565.                 if (!p_child->device_type) {
  566.                         /* skip the device block if device type is invalid */
  567.                         continue;
  568.                 }
  569.                 count++;
  570.         }
  571.         if (!count) {
  572.                 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
  573.                 return;
  574.         }
  575.         dev_priv->child_dev = kzalloc(sizeof(*p_child) * count, GFP_KERNEL);
  576.         if (!dev_priv->child_dev) {
  577.                 DRM_DEBUG_KMS("No memory space for child device\n");
  578.                 return;
  579.         }
  580.  
  581.         dev_priv->child_dev_num = count;
  582.         count = 0;
  583.         for (i = 0; i < child_device_num; i++) {
  584.                 p_child = &(p_defs->devices[i]);
  585.                 if (!p_child->device_type) {
  586.                         /* skip the device block if device type is invalid */
  587.                         continue;
  588.                 }
  589.                 child_dev_ptr = dev_priv->child_dev + count;
  590.                 count++;
  591.                 memcpy((void *)child_dev_ptr, (void *)p_child,
  592.                                         sizeof(*p_child));
  593.         }
  594.         return;
  595. }
  596.  
  597. static void
  598. init_vbt_defaults(struct drm_i915_private *dev_priv)
  599. {
  600.         struct drm_device *dev = dev_priv->dev;
  601.  
  602.         dev_priv->crt_ddc_pin = GMBUS_PORT_VGADDC;
  603.  
  604.         /* LFP panel data */
  605.         dev_priv->lvds_dither = 1;
  606.         dev_priv->lvds_vbt = 0;
  607.  
  608.         /* SDVO panel data */
  609.         dev_priv->sdvo_lvds_vbt_mode = NULL;
  610.  
  611.         /* general features */
  612.         dev_priv->int_tv_support = 1;
  613.         dev_priv->int_crt_support = 1;
  614.  
  615.         /* Default to using SSC */
  616.         dev_priv->lvds_use_ssc = 1;
  617.         dev_priv->lvds_ssc_freq = intel_bios_ssc_frequency(dev, 1);
  618.         DRM_DEBUG_KMS("Set default to SSC at %dMHz\n", dev_priv->lvds_ssc_freq);
  619.  
  620.         /* eDP data */
  621.         dev_priv->edp.bpp = 18;
  622. }
  623.  
  624. /**
  625.  * intel_parse_bios - find VBT and initialize settings from the BIOS
  626.  * @dev: DRM device
  627.  *
  628.  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
  629.  * to appropriate values.
  630.  *
  631.  * Returns 0 on success, nonzero on failure.
  632.  */
  633. bool
  634. intel_parse_bios(struct drm_device *dev)
  635. {
  636.         struct drm_i915_private *dev_priv = dev->dev_private;
  637.         struct pci_dev *pdev = dev->pdev;
  638.         struct bdb_header *bdb = NULL;
  639.         u8 __iomem *bios = NULL;
  640.  
  641.         init_vbt_defaults(dev_priv);
  642.  
  643.         /* XXX Should this validation be moved to intel_opregion.c? */
  644.         if (dev_priv->opregion.vbt) {
  645.                 struct vbt_header *vbt = dev_priv->opregion.vbt;
  646.                 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
  647.                         DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",
  648.                                          vbt->signature);
  649.                         bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
  650.                 } else
  651.                         dev_priv->opregion.vbt = NULL;
  652.         }
  653.  
  654.         if (bdb == NULL) {
  655.                 struct vbt_header *vbt = NULL;
  656.                 size_t size;
  657.                 int i;
  658.  
  659.                 bios = pci_map_rom(pdev, &size);
  660.                 if (!bios)
  661.                         return -1;
  662.  
  663.                 /* Scour memory looking for the VBT signature */
  664.                 for (i = 0; i + 4 < size; i++) {
  665.                         if (!memcmp(bios + i, "$VBT", 4)) {
  666.                                 vbt = (struct vbt_header *)(bios + i);
  667.                                 break;
  668.                         }
  669.                 }
  670.  
  671.                 if (!vbt) {
  672.                         DRM_ERROR("VBT signature missing\n");
  673.                         pci_unmap_rom(pdev, bios);
  674.                         return -1;
  675.                 }
  676.  
  677.                 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
  678.         }
  679.  
  680.         /* Grab useful general definitions */
  681.         parse_general_features(dev_priv, bdb);
  682.         parse_general_definitions(dev_priv, bdb);
  683.         parse_lfp_panel_data(dev_priv, bdb);
  684.         parse_sdvo_panel_data(dev_priv, bdb);
  685.         parse_sdvo_device_mapping(dev_priv, bdb);
  686.         parse_device_mapping(dev_priv, bdb);
  687.         parse_driver_features(dev_priv, bdb);
  688.         parse_edp(dev_priv, bdb);
  689.  
  690.         if (bios)
  691.                 pci_unmap_rom(pdev, bios);
  692.  
  693.         return 0;
  694. }
  695.  
  696. /* Ensure that vital registers have been initialised, even if the BIOS
  697.  * is absent or just failing to do its job.
  698.  */
  699. void intel_setup_bios(struct drm_device *dev)
  700. {
  701.         struct drm_i915_private *dev_priv = dev->dev_private;
  702.  
  703.          /* Set the Panel Power On/Off timings if uninitialized. */
  704.         if ((I915_READ(PP_ON_DELAYS) == 0) && (I915_READ(PP_OFF_DELAYS) == 0)) {
  705.                 /* Set T2 to 40ms and T5 to 200ms */
  706.                 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
  707.  
  708.                 /* Set T3 to 35ms and Tx to 200ms */
  709.                 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
  710.         }
  711. }
  712.