drivers/gpu/drm/i915/intel_bios.c

   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 static void
  61 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
  62                         struct lvds_dvo_timing *dvo_timing)
  63 {
  64         panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
  65                 dvo_timing->hactive_lo;
  66         panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
  67                 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
  68         panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
  69                 dvo_timing->hsync_pulse_width;
  70         panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
  71                 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
  72
  73         panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
  74                 dvo_timing->vactive_lo;
  75         panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
  76                 dvo_timing->vsync_off;
  77         panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
  78                 dvo_timing->vsync_pulse_width;
  79         panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
  80                 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
  81         panel_fixed_mode->clock = dvo_timing->clock * 10;
  82         panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
  83
  84         /* Some VBTs have bogus h/vtotal values */
  85         if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
  86                 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
  87         if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
  88                 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
  89
  90         drm_mode_set_name(panel_fixed_mode);
  91 }
  92
  93 /* Try to find integrated panel data */
  94 static void
  95 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
  96                             struct bdb_header *bdb)
  97 {
  98         struct bdb_lvds_options *lvds_options;
  99         struct bdb_lvds_lfp_data *lvds_lfp_data;
 100         struct bdb_lvds_lfp_data_entry *entry;
 101         struct lvds_dvo_timing *dvo_timing;
 102         struct drm_display_mode *panel_fixed_mode;
 103
 104         /* Defaults if we can't find VBT info */
 105         dev_priv->lvds_dither = 0;
 106         dev_priv->lvds_vbt = 0;
 107
 108         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 109         if (!lvds_options)
 110                 return;
 111
 112         dev_priv->lvds_dither = lvds_options->pixel_dither;
 113         if (lvds_options->panel_type == 0xff)
 114                 return;
 115
 116         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 117         if (!lvds_lfp_data)
 118                 return;
 119
 120         dev_priv->lvds_vbt = 1;
 121
 122         entry = &lvds_lfp_data->data[lvds_options->panel_type];
 123         dvo_timing = &entry->dvo_timing;
 124
 125         panel_fixed_mode = drm_calloc(1, sizeof(*panel_fixed_mode),
 126                                       DRM_MEM_DRIVER);
 127
 128         fill_detail_timing_data(panel_fixed_mode, dvo_timing);
 129
 130         dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
 131
 132         DRM_DEBUG("Found panel mode in BIOS VBT tables:\n");
 133         drm_mode_debug_printmodeline(panel_fixed_mode);
 134
 135         return;
 136 }
 137
 138 /* Try to find sdvo panel data */
 139 static void
 140 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
 141                       struct bdb_header *bdb)
 142 {
 143         struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 144         struct lvds_dvo_timing *dvo_timing;
 145         struct drm_display_mode *panel_fixed_mode;
 146
 147         dev_priv->sdvo_lvds_vbt_mode = NULL;
 148
 149         sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 150         if (!sdvo_lvds_options)
 151                 return;
 152
 153         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 154         if (!dvo_timing)
 155                 return;
 156
 157         panel_fixed_mode = drm_calloc(1, sizeof(*panel_fixed_mode),
 158                                       DRM_MEM_DRIVER);
 159
 160         if (!panel_fixed_mode)
 161                 return;
 162
 163         fill_detail_timing_data(panel_fixed_mode,
 164                         dvo_timing + sdvo_lvds_options->panel_type);
 165
 166         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
 167
 168         return;
 169 }
 170
 171 static void
 172 parse_general_features(struct drm_i915_private *dev_priv,
 173                        struct bdb_header *bdb)
 174 {
 175         struct bdb_general_features *general;
 176
 177         /* Set sensible defaults in case we can't find the general block */
 178         dev_priv->int_tv_support = 1;
 179         dev_priv->int_crt_support = 1;
 180
 181         general = find_section(bdb, BDB_GENERAL_FEATURES);
 182         if (general) {
 183                 dev_priv->int_tv_support = general->int_tv_support;
 184                 dev_priv->int_crt_support = general->int_crt_support;
 185                 dev_priv->lvds_use_ssc = general->enable_ssc;
 186
 187                 if (dev_priv->lvds_use_ssc) {
 188                   if (IS_I855(dev_priv->dev))
 189                     dev_priv->lvds_ssc_freq = general->ssc_freq ? 66 : 48;
 190                   else
 191                     dev_priv->lvds_ssc_freq = general->ssc_freq ? 100 : 96;
 192                 }
 193         }
 194 }
 195
 196 /**
 197  * intel_init_bios - initialize VBIOS settings & find VBT
 198  * @dev: DRM device
 199  *
 200  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 201  * to appropriate values.
 202  *
 203  * VBT existence is a sanity check that is relied on by other i830_bios.c code.
 204  * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
 205  * feed an updated VBT back through that, compared to what we'll fetch using
 206  * this method of groping around in the BIOS data.
 207  *
 208  * Returns 0 on success, nonzero on failure.
 209  */
 210 bool
 211 intel_init_bios(struct drm_device *dev)
 212 {
 213         struct drm_i915_private *dev_priv = dev->dev_private;
 214         struct pci_dev *pdev = dev->pdev;
 215         struct vbt_header *vbt = NULL;
 216         struct bdb_header *bdb;
 217         u8 __iomem *bios;
 218         size_t size;
 219         int i;
 220
 221         bios = pci_map_rom(pdev, &size);
 222         if (!bios)
 223                 return -1;
 224
 225         /* Scour memory looking for the VBT signature */
 226         for (i = 0; i + 4 < size; i++) {
 227                 if (!memcmp(bios + i, "$VBT", 4)) {
 228                         vbt = (struct vbt_header *)(bios + i);
 229                         break;
 230                 }
 231         }
 232
 233         if (!vbt) {
 234                 DRM_ERROR("VBT signature missing\n");
 235                 pci_unmap_rom(pdev, bios);
 236                 return -1;
 237         }
 238
 239         bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 240
 241         /* Grab useful general definitions */
 242         parse_general_features(dev_priv, bdb);
 243         parse_lfp_panel_data(dev_priv, bdb);
 244         parse_sdvo_panel_data(dev_priv, bdb);
 245
 246         pci_unmap_rom(pdev, bios);
 247
 248         return 0;
 249 }