Jesse Barnes | 79e5394 | 2008-11-07 14:24:08 -0800 | [diff] [blame] | 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 "drmP.h" |
| 28 | #include "drm.h" |
| 29 | #include "i915_drm.h" |
| 30 | #include "i915_drv.h" |
| 31 | #include "intel_bios.h" |
| 32 | |
| 33 | |
| 34 | static void * |
| 35 | find_section(struct bdb_header *bdb, int section_id) |
| 36 | { |
| 37 | u8 *base = (u8 *)bdb; |
| 38 | int index = 0; |
| 39 | u16 total, current_size; |
| 40 | u8 current_id; |
| 41 | |
| 42 | /* skip to first section */ |
| 43 | index += bdb->header_size; |
| 44 | total = bdb->bdb_size; |
| 45 | |
| 46 | /* walk the sections looking for section_id */ |
| 47 | while (index < total) { |
| 48 | current_id = *(base + index); |
| 49 | index++; |
| 50 | current_size = *((u16 *)(base + index)); |
| 51 | index += 2; |
| 52 | if (current_id == section_id) |
| 53 | return base + index; |
| 54 | index += current_size; |
| 55 | } |
| 56 | |
| 57 | return NULL; |
| 58 | } |
| 59 | |
| 60 | /* Try to find panel data */ |
| 61 | static void |
| 62 | parse_panel_data(struct drm_i915_private *dev_priv, struct bdb_header *bdb) |
| 63 | { |
| 64 | struct bdb_lvds_options *lvds_options; |
| 65 | struct bdb_lvds_lfp_data *lvds_lfp_data; |
| 66 | struct bdb_lvds_lfp_data_entry *entry; |
| 67 | struct lvds_dvo_timing *dvo_timing; |
| 68 | struct drm_display_mode *panel_fixed_mode; |
| 69 | |
| 70 | /* Defaults if we can't find VBT info */ |
| 71 | dev_priv->lvds_dither = 0; |
| 72 | dev_priv->lvds_vbt = 0; |
| 73 | |
| 74 | lvds_options = find_section(bdb, BDB_LVDS_OPTIONS); |
| 75 | if (!lvds_options) |
| 76 | return; |
| 77 | |
| 78 | dev_priv->lvds_dither = lvds_options->pixel_dither; |
| 79 | if (lvds_options->panel_type == 0xff) |
| 80 | return; |
| 81 | |
| 82 | lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA); |
| 83 | if (!lvds_lfp_data) |
| 84 | return; |
| 85 | |
| 86 | dev_priv->lvds_vbt = 1; |
| 87 | |
| 88 | entry = &lvds_lfp_data->data[lvds_options->panel_type]; |
| 89 | dvo_timing = &entry->dvo_timing; |
| 90 | |
| 91 | panel_fixed_mode = drm_calloc(1, sizeof(*panel_fixed_mode), |
| 92 | DRM_MEM_DRIVER); |
| 93 | |
| 94 | panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) | |
| 95 | dvo_timing->hactive_lo; |
| 96 | panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay + |
| 97 | ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo); |
| 98 | panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start + |
| 99 | dvo_timing->hsync_pulse_width; |
| 100 | panel_fixed_mode->htotal = panel_fixed_mode->hdisplay + |
| 101 | ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo); |
| 102 | |
| 103 | panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) | |
| 104 | dvo_timing->vactive_lo; |
| 105 | panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay + |
| 106 | dvo_timing->vsync_off; |
| 107 | panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start + |
| 108 | dvo_timing->vsync_pulse_width; |
| 109 | panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay + |
| 110 | ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo); |
| 111 | panel_fixed_mode->clock = dvo_timing->clock * 10; |
| 112 | panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED; |
| 113 | |
Jesse Barnes | 37df967 | 2009-02-23 15:36:42 -0800 | [diff] [blame] | 114 | /* Some VBTs have bogus h/vtotal values */ |
| 115 | if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal) |
| 116 | panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1; |
| 117 | if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal) |
| 118 | panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1; |
| 119 | |
Jesse Barnes | 79e5394 | 2008-11-07 14:24:08 -0800 | [diff] [blame] | 120 | drm_mode_set_name(panel_fixed_mode); |
| 121 | |
| 122 | dev_priv->vbt_mode = panel_fixed_mode; |
| 123 | |
| 124 | DRM_DEBUG("Found panel mode in BIOS VBT tables:\n"); |
| 125 | drm_mode_debug_printmodeline(panel_fixed_mode); |
| 126 | |
| 127 | return; |
| 128 | } |
| 129 | |
| 130 | static void |
| 131 | parse_general_features(struct drm_i915_private *dev_priv, |
| 132 | struct bdb_header *bdb) |
| 133 | { |
| 134 | struct bdb_general_features *general; |
| 135 | |
| 136 | /* Set sensible defaults in case we can't find the general block */ |
| 137 | dev_priv->int_tv_support = 1; |
| 138 | dev_priv->int_crt_support = 1; |
| 139 | |
| 140 | general = find_section(bdb, BDB_GENERAL_FEATURES); |
| 141 | if (general) { |
| 142 | dev_priv->int_tv_support = general->int_tv_support; |
| 143 | dev_priv->int_crt_support = general->int_crt_support; |
Kristian Høgsberg | 43565a0 | 2009-02-13 20:56:52 -0500 | [diff] [blame] | 144 | dev_priv->lvds_use_ssc = general->enable_ssc; |
| 145 | |
| 146 | if (dev_priv->lvds_use_ssc) { |
| 147 | if (IS_I855(dev_priv->dev)) |
| 148 | dev_priv->lvds_ssc_freq = general->ssc_freq ? 66 : 48; |
| 149 | else |
| 150 | dev_priv->lvds_ssc_freq = general->ssc_freq ? 100 : 96; |
| 151 | } |
Jesse Barnes | 79e5394 | 2008-11-07 14:24:08 -0800 | [diff] [blame] | 152 | } |
| 153 | } |
| 154 | |
| 155 | /** |
| 156 | * intel_init_bios - initialize VBIOS settings & find VBT |
| 157 | * @dev: DRM device |
| 158 | * |
| 159 | * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers |
| 160 | * to appropriate values. |
| 161 | * |
| 162 | * VBT existence is a sanity check that is relied on by other i830_bios.c code. |
| 163 | * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may |
| 164 | * feed an updated VBT back through that, compared to what we'll fetch using |
| 165 | * this method of groping around in the BIOS data. |
| 166 | * |
| 167 | * Returns 0 on success, nonzero on failure. |
| 168 | */ |
| 169 | bool |
| 170 | intel_init_bios(struct drm_device *dev) |
| 171 | { |
| 172 | struct drm_i915_private *dev_priv = dev->dev_private; |
| 173 | struct pci_dev *pdev = dev->pdev; |
| 174 | struct vbt_header *vbt = NULL; |
| 175 | struct bdb_header *bdb; |
| 176 | u8 __iomem *bios; |
| 177 | size_t size; |
| 178 | int i; |
| 179 | |
| 180 | bios = pci_map_rom(pdev, &size); |
| 181 | if (!bios) |
| 182 | return -1; |
| 183 | |
| 184 | /* Scour memory looking for the VBT signature */ |
| 185 | for (i = 0; i + 4 < size; i++) { |
| 186 | if (!memcmp(bios + i, "$VBT", 4)) { |
| 187 | vbt = (struct vbt_header *)(bios + i); |
| 188 | break; |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | if (!vbt) { |
| 193 | DRM_ERROR("VBT signature missing\n"); |
| 194 | pci_unmap_rom(pdev, bios); |
| 195 | return -1; |
| 196 | } |
| 197 | |
| 198 | bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset); |
| 199 | |
| 200 | /* Grab useful general definitions */ |
| 201 | parse_general_features(dev_priv, bdb); |
| 202 | parse_panel_data(dev_priv, bdb); |
| 203 | |
| 204 | pci_unmap_rom(pdev, bios); |
| 205 | |
| 206 | return 0; |
| 207 | } |