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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 <drm/drmP.h>
  29. #include <drm/i915_drm.h>
  30. #include "i915_drv.h"
  31. #include "intel_bios.h"
  32.  
  33. #define SLAVE_ADDR1     0x70
  34. #define SLAVE_ADDR2     0x72
  35.  
  36. static int panel_type;
  37.  
  38. static void *
  39. find_section(struct bdb_header *bdb, int section_id)
  40. {
  41.         u8 *base = (u8 *)bdb;
  42.         int index = 0;
  43.         u16 total, current_size;
  44.         u8 current_id;
  45.  
  46.         /* skip to first section */
  47.         index += bdb->header_size;
  48.         total = bdb->bdb_size;
  49.  
  50.         /* walk the sections looking for section_id */
  51.         while (index < total) {
  52.                 current_id = *(base + index);
  53.                 index++;
  54.                 current_size = *((u16 *)(base + index));
  55.                 index += 2;
  56.                 if (current_id == section_id)
  57.                         return base + index;
  58.                 index += current_size;
  59.         }
  60.  
  61.         return NULL;
  62. }
  63.  
  64. static u16
  65. get_blocksize(void *p)
  66. {
  67.         u16 *block_ptr, block_size;
  68.  
  69.         block_ptr = (u16 *)((char *)p - 2);
  70.         block_size = *block_ptr;
  71.         return block_size;
  72. }
  73.  
  74. static void
  75. fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
  76.                         const struct lvds_dvo_timing *dvo_timing)
  77. {
  78.         panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
  79.                 dvo_timing->hactive_lo;
  80.         panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
  81.                 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
  82.         panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
  83.                 dvo_timing->hsync_pulse_width;
  84.         panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
  85.                 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
  86.  
  87.         panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
  88.                 dvo_timing->vactive_lo;
  89.         panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
  90.                 dvo_timing->vsync_off;
  91.         panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
  92.                 dvo_timing->vsync_pulse_width;
  93.         panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
  94.                 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
  95.         panel_fixed_mode->clock = dvo_timing->clock * 10;
  96.         panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
  97.  
  98.         if (dvo_timing->hsync_positive)
  99.                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
  100.         else
  101.                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
  102.  
  103.         if (dvo_timing->vsync_positive)
  104.                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
  105.         else
  106.                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
  107.  
  108.         /* Some VBTs have bogus h/vtotal values */
  109.         if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
  110.                 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
  111.         if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
  112.                 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
  113.  
  114.         drm_mode_set_name(panel_fixed_mode);
  115. }
  116.  
  117. static bool
  118. lvds_dvo_timing_equal_size(const struct lvds_dvo_timing *a,
  119.                            const struct lvds_dvo_timing *b)
  120. {
  121.         if (a->hactive_hi != b->hactive_hi ||
  122.             a->hactive_lo != b->hactive_lo)
  123.                 return false;
  124.  
  125.         if (a->hsync_off_hi != b->hsync_off_hi ||
  126.             a->hsync_off_lo != b->hsync_off_lo)
  127.                 return false;
  128.  
  129.         if (a->hsync_pulse_width != b->hsync_pulse_width)
  130.                 return false;
  131.  
  132.         if (a->hblank_hi != b->hblank_hi ||
  133.             a->hblank_lo != b->hblank_lo)
  134.                 return false;
  135.  
  136.         if (a->vactive_hi != b->vactive_hi ||
  137.             a->vactive_lo != b->vactive_lo)
  138.                 return false;
  139.  
  140.         if (a->vsync_off != b->vsync_off)
  141.                 return false;
  142.  
  143.         if (a->vsync_pulse_width != b->vsync_pulse_width)
  144.                 return false;
  145.  
  146.         if (a->vblank_hi != b->vblank_hi ||
  147.             a->vblank_lo != b->vblank_lo)
  148.                 return false;
  149.  
  150.         return true;
  151. }
  152.  
  153. static const struct lvds_dvo_timing *
  154. get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data,
  155.                     const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs,
  156.                     int index)
  157. {
  158.         /*
  159.          * the size of fp_timing varies on the different platform.
  160.          * So calculate the DVO timing relative offset in LVDS data
  161.          * entry to get the DVO timing entry
  162.          */
  163.  
  164.         int lfp_data_size =
  165.                 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
  166.                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
  167.         int dvo_timing_offset =
  168.                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
  169.                 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
  170.         char *entry = (char *)lvds_lfp_data->data + lfp_data_size * index;
  171.  
  172.         return (struct lvds_dvo_timing *)(entry + dvo_timing_offset);
  173. }
  174.  
  175. /* get lvds_fp_timing entry
  176.  * this function may return NULL if the corresponding entry is invalid
  177.  */
  178. static const struct lvds_fp_timing *
  179. get_lvds_fp_timing(const struct bdb_header *bdb,
  180.                    const struct bdb_lvds_lfp_data *data,
  181.                    const struct bdb_lvds_lfp_data_ptrs *ptrs,
  182.                    int index)
  183. {
  184.         size_t data_ofs = (const u8 *)data - (const u8 *)bdb;
  185.         u16 data_size = ((const u16 *)data)[-1]; /* stored in header */
  186.         size_t ofs;
  187.  
  188.         if (index >= ARRAY_SIZE(ptrs->ptr))
  189.                 return NULL;
  190.         ofs = ptrs->ptr[index].fp_timing_offset;
  191.         if (ofs < data_ofs ||
  192.             ofs + sizeof(struct lvds_fp_timing) > data_ofs + data_size)
  193.                 return NULL;
  194.         return (const struct lvds_fp_timing *)((const u8 *)bdb + ofs);
  195. }
  196.  
  197. /* Try to find integrated panel data */
  198. static void
  199. parse_lfp_panel_data(struct drm_i915_private *dev_priv,
  200.                             struct bdb_header *bdb)
  201. {
  202.         const struct bdb_lvds_options *lvds_options;
  203.         const struct bdb_lvds_lfp_data *lvds_lfp_data;
  204.         const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
  205.         const struct lvds_dvo_timing *panel_dvo_timing;
  206.         const struct lvds_fp_timing *fp_timing;
  207.         struct drm_display_mode *panel_fixed_mode;
  208.         int i, downclock;
  209.  
  210.         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
  211.         if (!lvds_options)
  212.                 return;
  213.  
  214.         dev_priv->lvds_dither = lvds_options->pixel_dither;
  215.         if (lvds_options->panel_type == 0xff)
  216.                 return;
  217.  
  218.         panel_type = lvds_options->panel_type;
  219.  
  220.         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
  221.         if (!lvds_lfp_data)
  222.                 return;
  223.  
  224.         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
  225.         if (!lvds_lfp_data_ptrs)
  226.                 return;
  227.  
  228.         dev_priv->lvds_vbt = 1;
  229.  
  230.         panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
  231.                                                lvds_lfp_data_ptrs,
  232.                                                lvds_options->panel_type);
  233.  
  234.         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
  235.         if (!panel_fixed_mode)
  236.                 return;
  237.  
  238.         fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
  239.  
  240.         dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
  241.  
  242.         DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
  243.         drm_mode_debug_printmodeline(panel_fixed_mode);
  244.  
  245.         /*
  246.          * Iterate over the LVDS panel timing info to find the lowest clock
  247.          * for the native resolution.
  248.          */
  249.         downclock = panel_dvo_timing->clock;
  250.         for (i = 0; i < 16; i++) {
  251.                 const struct lvds_dvo_timing *dvo_timing;
  252.  
  253.                 dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
  254.                                                  lvds_lfp_data_ptrs,
  255.                                                  i);
  256.                 if (lvds_dvo_timing_equal_size(dvo_timing, panel_dvo_timing) &&
  257.                     dvo_timing->clock < downclock)
  258.                         downclock = dvo_timing->clock;
  259.         }
  260.  
  261.         if (downclock < panel_dvo_timing->clock && i915_lvds_downclock) {
  262.                 dev_priv->lvds_downclock_avail = 1;
  263.                 dev_priv->lvds_downclock = downclock * 10;
  264.                 DRM_DEBUG_KMS("LVDS downclock is found in VBT. "
  265.                               "Normal Clock %dKHz, downclock %dKHz\n",
  266.                               panel_fixed_mode->clock, 10*downclock);
  267.         }
  268.  
  269.         fp_timing = get_lvds_fp_timing(bdb, lvds_lfp_data,
  270.                                        lvds_lfp_data_ptrs,
  271.                                        lvds_options->panel_type);
  272.         if (fp_timing) {
  273.                 /* check the resolution, just to be sure */
  274.                 if (fp_timing->x_res == panel_fixed_mode->hdisplay &&
  275.                     fp_timing->y_res == panel_fixed_mode->vdisplay) {
  276.                         dev_priv->bios_lvds_val = fp_timing->lvds_reg_val;
  277.                         DRM_DEBUG_KMS("VBT initial LVDS value %x\n",
  278.                                       dev_priv->bios_lvds_val);
  279.                 }
  280.         }
  281. }
  282.  
  283. /* Try to find sdvo panel data */
  284. static void
  285. parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
  286.                       struct bdb_header *bdb)
  287. {
  288.         struct lvds_dvo_timing *dvo_timing;
  289.         struct drm_display_mode *panel_fixed_mode;
  290.         int index;
  291.  
  292.         index = i915_vbt_sdvo_panel_type;
  293.         if (index == -2) {
  294.                 DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n");
  295.                 return;
  296.         }
  297.  
  298.         if (index == -1) {
  299.                 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
  300.  
  301.                 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
  302.                 if (!sdvo_lvds_options)
  303.                         return;
  304.  
  305.                 index = sdvo_lvds_options->panel_type;
  306.         }
  307.  
  308.         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
  309.         if (!dvo_timing)
  310.                 return;
  311.  
  312.         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
  313.         if (!panel_fixed_mode)
  314.                 return;
  315.  
  316.         fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
  317.  
  318.         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
  319.  
  320.         DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
  321.         drm_mode_debug_printmodeline(panel_fixed_mode);
  322. }
  323.  
  324. static int intel_bios_ssc_frequency(struct drm_device *dev,
  325.                                     bool alternate)
  326. {
  327.         switch (INTEL_INFO(dev)->gen) {
  328.         case 2:
  329.                 return alternate ? 66 : 48;
  330.         case 3:
  331.         case 4:
  332.                 return alternate ? 100 : 96;
  333.         default:
  334.                 return alternate ? 100 : 120;
  335.         }
  336. }
  337.  
  338. static void
  339. parse_general_features(struct drm_i915_private *dev_priv,
  340.                        struct bdb_header *bdb)
  341. {
  342.         struct drm_device *dev = dev_priv->dev;
  343.         struct bdb_general_features *general;
  344.  
  345.         general = find_section(bdb, BDB_GENERAL_FEATURES);
  346.         if (general) {
  347.                 dev_priv->int_tv_support = general->int_tv_support;
  348.                 dev_priv->int_crt_support = general->int_crt_support;
  349.                 dev_priv->lvds_use_ssc = general->enable_ssc;
  350.                 dev_priv->lvds_ssc_freq =
  351.                         intel_bios_ssc_frequency(dev, general->ssc_freq);
  352.                 dev_priv->display_clock_mode = general->display_clock_mode;
  353.                 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",
  354.                               dev_priv->int_tv_support,
  355.                               dev_priv->int_crt_support,
  356.                               dev_priv->lvds_use_ssc,
  357.                               dev_priv->lvds_ssc_freq,
  358.                               dev_priv->display_clock_mode);
  359.         }
  360. }
  361.  
  362. static void
  363. parse_general_definitions(struct drm_i915_private *dev_priv,
  364.                           struct bdb_header *bdb)
  365. {
  366.         struct bdb_general_definitions *general;
  367.  
  368.         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
  369.         if (general) {
  370.                 u16 block_size = get_blocksize(general);
  371.                 if (block_size >= sizeof(*general)) {
  372.                         int bus_pin = general->crt_ddc_gmbus_pin;
  373.                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
  374.                         if (intel_gmbus_is_port_valid(bus_pin))
  375.                                 dev_priv->crt_ddc_pin = bus_pin;
  376.                 } else {
  377.                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
  378.                                   block_size);
  379.                 }
  380.         }
  381. }
  382.  
  383. static void
  384. parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
  385.                           struct bdb_header *bdb)
  386. {
  387.         struct sdvo_device_mapping *p_mapping;
  388.         struct bdb_general_definitions *p_defs;
  389.         struct child_device_config *p_child;
  390.         int i, child_device_num, count;
  391.         u16     block_size;
  392.  
  393.         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
  394.         if (!p_defs) {
  395.                 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
  396.                 return;
  397.         }
  398.         /* judge whether the size of child device meets the requirements.
  399.          * If the child device size obtained from general definition block
  400.          * is different with sizeof(struct child_device_config), skip the
  401.          * parsing of sdvo device info
  402.          */
  403.         if (p_defs->child_dev_size != sizeof(*p_child)) {
  404.                 /* different child dev size . Ignore it */
  405.                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
  406.                 return;
  407.         }
  408.         /* get the block size of general definitions */
  409.         block_size = get_blocksize(p_defs);
  410.         /* get the number of child device */
  411.         child_device_num = (block_size - sizeof(*p_defs)) /
  412.                                 sizeof(*p_child);
  413.         count = 0;
  414.         for (i = 0; i < child_device_num; i++) {
  415.                 p_child = &(p_defs->devices[i]);
  416.                 if (!p_child->device_type) {
  417.                         /* skip the device block if device type is invalid */
  418.                         continue;
  419.                 }
  420.                 if (p_child->slave_addr != SLAVE_ADDR1 &&
  421.                         p_child->slave_addr != SLAVE_ADDR2) {
  422.                         /*
  423.                          * If the slave address is neither 0x70 nor 0x72,
  424.                          * it is not a SDVO device. Skip it.
  425.                          */
  426.                         continue;
  427.                 }
  428.                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
  429.                         p_child->dvo_port != DEVICE_PORT_DVOC) {
  430.                         /* skip the incorrect SDVO port */
  431.                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
  432.                         continue;
  433.                 }
  434.                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
  435.                                 " %s port\n",
  436.                                 p_child->slave_addr,
  437.                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
  438.                                         "SDVOB" : "SDVOC");
  439.                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
  440.                 if (!p_mapping->initialized) {
  441.                         p_mapping->dvo_port = p_child->dvo_port;
  442.                         p_mapping->slave_addr = p_child->slave_addr;
  443.                         p_mapping->dvo_wiring = p_child->dvo_wiring;
  444.                         p_mapping->ddc_pin = p_child->ddc_pin;
  445.                         p_mapping->i2c_pin = p_child->i2c_pin;
  446.                         p_mapping->initialized = 1;
  447.                         DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
  448.                                       p_mapping->dvo_port,
  449.                                       p_mapping->slave_addr,
  450.                                       p_mapping->dvo_wiring,
  451.                                       p_mapping->ddc_pin,
  452.                                       p_mapping->i2c_pin);
  453.                 } else {
  454.                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
  455.                                          "two SDVO device.\n");
  456.                 }
  457.                 if (p_child->slave2_addr) {
  458.                         /* Maybe this is a SDVO device with multiple inputs */
  459.                         /* And the mapping info is not added */
  460.                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
  461.                                 " is a SDVO device with multiple inputs.\n");
  462.                 }
  463.                 count++;
  464.         }
  465.  
  466.         if (!count) {
  467.                 /* No SDVO device info is found */
  468.                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
  469.         }
  470.         return;
  471. }
  472.  
  473. static void
  474. parse_driver_features(struct drm_i915_private *dev_priv,
  475.                        struct bdb_header *bdb)
  476. {
  477.         struct drm_device *dev = dev_priv->dev;
  478.         struct bdb_driver_features *driver;
  479.  
  480.         driver = find_section(bdb, BDB_DRIVER_FEATURES);
  481.         if (!driver)
  482.                 return;
  483.  
  484.         if (SUPPORTS_EDP(dev) &&
  485.             driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
  486.                 dev_priv->edp.support = 1;
  487.  
  488.         if (driver->dual_frequency)
  489.                 dev_priv->render_reclock_avail = true;
  490. }
  491.  
  492. static void
  493. parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
  494. {
  495.         struct bdb_edp *edp;
  496.         struct edp_power_seq *edp_pps;
  497.         struct edp_link_params *edp_link_params;
  498.  
  499.         edp = find_section(bdb, BDB_EDP);
  500.         if (!edp) {
  501.                 if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->edp.support) {
  502.                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel "
  503.                                       "supported, assume %dbpp panel color "
  504.                                       "depth.\n",
  505.                                       dev_priv->edp.bpp);
  506.                 }
  507.                 return;
  508.         }
  509.  
  510.         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
  511.         case EDP_18BPP:
  512.                 dev_priv->edp.bpp = 18;
  513.                 break;
  514.         case EDP_24BPP:
  515.                 dev_priv->edp.bpp = 24;
  516.                 break;
  517.         case EDP_30BPP:
  518.                 dev_priv->edp.bpp = 30;
  519.                 break;
  520.         }
  521.  
  522.         /* Get the eDP sequencing and link info */
  523.         edp_pps = &edp->power_seqs[panel_type];
  524.         edp_link_params = &edp->link_params[panel_type];
  525.  
  526.         dev_priv->edp.pps = *edp_pps;
  527.  
  528.         dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
  529.                 DP_LINK_BW_1_62;
  530.         switch (edp_link_params->lanes) {
  531.         case 0:
  532.                 dev_priv->edp.lanes = 1;
  533.                 break;
  534.         case 1:
  535.                 dev_priv->edp.lanes = 2;
  536.                 break;
  537.         case 3:
  538.         default:
  539.                 dev_priv->edp.lanes = 4;
  540.                 break;
  541.         }
  542.         switch (edp_link_params->preemphasis) {
  543.         case 0:
  544.                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
  545.                 break;
  546.         case 1:
  547.                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
  548.                 break;
  549.         case 2:
  550.                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
  551.                 break;
  552.         case 3:
  553.                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
  554.                 break;
  555.         }
  556.         switch (edp_link_params->vswing) {
  557.         case 0:
  558.                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_400;
  559.                 break;
  560.         case 1:
  561.                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_600;
  562.                 break;
  563.         case 2:
  564.                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_800;
  565.                 break;
  566.         case 3:
  567.                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_1200;
  568.                 break;
  569.         }
  570. }
  571.  
  572. static void
  573. parse_device_mapping(struct drm_i915_private *dev_priv,
  574.                        struct bdb_header *bdb)
  575. {
  576.         struct bdb_general_definitions *p_defs;
  577.         struct child_device_config *p_child, *child_dev_ptr;
  578.         int i, child_device_num, count;
  579.         u16     block_size;
  580.  
  581.         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
  582.         if (!p_defs) {
  583.                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
  584.                 return;
  585.         }
  586.         /* judge whether the size of child device meets the requirements.
  587.          * If the child device size obtained from general definition block
  588.          * is different with sizeof(struct child_device_config), skip the
  589.          * parsing of sdvo device info
  590.          */
  591.         if (p_defs->child_dev_size != sizeof(*p_child)) {
  592.                 /* different child dev size . Ignore it */
  593.                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
  594.                 return;
  595.         }
  596.         /* get the block size of general definitions */
  597.         block_size = get_blocksize(p_defs);
  598.         /* get the number of child device */
  599.         child_device_num = (block_size - sizeof(*p_defs)) /
  600.                                 sizeof(*p_child);
  601.         count = 0;
  602.         /* get the number of child device that is present */
  603.         for (i = 0; i < child_device_num; i++) {
  604.                 p_child = &(p_defs->devices[i]);
  605.                 if (!p_child->device_type) {
  606.                         /* skip the device block if device type is invalid */
  607.                         continue;
  608.                 }
  609.                 count++;
  610.         }
  611.         if (!count) {
  612.                 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
  613.                 return;
  614.         }
  615.         dev_priv->child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL);
  616.         if (!dev_priv->child_dev) {
  617.                 DRM_DEBUG_KMS("No memory space for child device\n");
  618.                 return;
  619.         }
  620.  
  621.         dev_priv->child_dev_num = count;
  622.         count = 0;
  623.         for (i = 0; i < child_device_num; i++) {
  624.                 p_child = &(p_defs->devices[i]);
  625.                 if (!p_child->device_type) {
  626.                         /* skip the device block if device type is invalid */
  627.                         continue;
  628.                 }
  629.                 child_dev_ptr = dev_priv->child_dev + count;
  630.                 count++;
  631.                 memcpy((void *)child_dev_ptr, (void *)p_child,
  632.                                         sizeof(*p_child));
  633.         }
  634.         return;
  635. }
  636.  
  637. static void
  638. init_vbt_defaults(struct drm_i915_private *dev_priv)
  639. {
  640.         struct drm_device *dev = dev_priv->dev;
  641.  
  642.         dev_priv->crt_ddc_pin = GMBUS_PORT_VGADDC;
  643.  
  644.         /* LFP panel data */
  645.         dev_priv->lvds_dither = 1;
  646.         dev_priv->lvds_vbt = 0;
  647.  
  648.         /* SDVO panel data */
  649.         dev_priv->sdvo_lvds_vbt_mode = NULL;
  650.  
  651.         /* general features */
  652.         dev_priv->int_tv_support = 1;
  653.         dev_priv->int_crt_support = 1;
  654.  
  655.         /* Default to using SSC */
  656.         dev_priv->lvds_use_ssc = 1;
  657.         dev_priv->lvds_ssc_freq = intel_bios_ssc_frequency(dev, 1);
  658.         DRM_DEBUG_KMS("Set default to SSC at %dMHz\n", dev_priv->lvds_ssc_freq);
  659.  
  660.         /* eDP data */
  661.         dev_priv->edp.bpp = 18;
  662. }
  663.  
  664. /**
  665.  * intel_parse_bios - find VBT and initialize settings from the BIOS
  666.  * @dev: DRM device
  667.  *
  668.  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
  669.  * to appropriate values.
  670.  *
  671.  * Returns 0 on success, nonzero on failure.
  672.  */
  673. int
  674. intel_parse_bios(struct drm_device *dev)
  675. {
  676.         struct drm_i915_private *dev_priv = dev->dev_private;
  677.         struct pci_dev *pdev = dev->pdev;
  678.         struct bdb_header *bdb = NULL;
  679.         u8 __iomem *bios = NULL;
  680.  
  681.         init_vbt_defaults(dev_priv);
  682.  
  683.         /* XXX Should this validation be moved to intel_opregion.c? */
  684.         if (dev_priv->opregion.vbt) {
  685.                 struct vbt_header *vbt = dev_priv->opregion.vbt;
  686.                 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
  687.                         DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",
  688.                                          vbt->signature);
  689.                         bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
  690.                 } else
  691.                         dev_priv->opregion.vbt = NULL;
  692.         }
  693.  
  694.         if (bdb == NULL) {
  695.                 struct vbt_header *vbt = NULL;
  696.                 size_t size;
  697.                 int i;
  698.  
  699.                 bios = pci_map_rom(pdev, &size);
  700.                 if (!bios)
  701.                         return -1;
  702.  
  703.                 /* Scour memory looking for the VBT signature */
  704.                 for (i = 0; i + 4 < size; i++) {
  705.                         if (!memcmp(bios + i, "$VBT", 4)) {
  706.                                 vbt = (struct vbt_header *)(bios + i);
  707.                                 break;
  708.                         }
  709.                 }
  710.  
  711.                 if (!vbt) {
  712.                         DRM_DEBUG_DRIVER("VBT signature missing\n");
  713.                         pci_unmap_rom(pdev, bios);
  714.                         return -1;
  715.                 }
  716.  
  717.                 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
  718.         }
  719.  
  720.         /* Grab useful general definitions */
  721.         parse_general_features(dev_priv, bdb);
  722.         parse_general_definitions(dev_priv, bdb);
  723.         parse_lfp_panel_data(dev_priv, bdb);
  724.         parse_sdvo_panel_data(dev_priv, bdb);
  725.         parse_sdvo_device_mapping(dev_priv, bdb);
  726.         parse_device_mapping(dev_priv, bdb);
  727.         parse_driver_features(dev_priv, bdb);
  728.         parse_edp(dev_priv, bdb);
  729.  
  730.         if (bios)
  731.                 pci_unmap_rom(pdev, bios);
  732.  
  733.         return 0;
  734. }
  735.  
  736. /* Ensure that vital registers have been initialised, even if the BIOS
  737.  * is absent or just failing to do its job.
  738.  */
  739. void intel_setup_bios(struct drm_device *dev)
  740. {
  741.         struct drm_i915_private *dev_priv = dev->dev_private;
  742.  
  743.          /* Set the Panel Power On/Off timings if uninitialized. */
  744.         if ((I915_READ(PP_ON_DELAYS) == 0) && (I915_READ(PP_OFF_DELAYS) == 0)) {
  745.                 /* Set T2 to 40ms and T5 to 200ms */
  746.                 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
  747.  
  748.                 /* Set T3 to 35ms and Tx to 200ms */
  749.                 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
  750.         }
  751. }
  752.