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Diffstat (limited to 'drivers/gpu/drm/i915/intel_bios.c')
-rw-r--r--drivers/gpu/drm/i915/intel_bios.c193
1 files changed, 193 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
new file mode 100644
index 000000000000..4ca82a025525
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -0,0 +1,193 @@
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
34static void *
35find_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 */
61static void
62parse_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
114 drm_mode_set_name(panel_fixed_mode);
115
116 dev_priv->vbt_mode = panel_fixed_mode;
117
118 DRM_DEBUG("Found panel mode in BIOS VBT tables:\n");
119 drm_mode_debug_printmodeline(panel_fixed_mode);
120
121 return;
122}
123
124static void
125parse_general_features(struct drm_i915_private *dev_priv,
126 struct bdb_header *bdb)
127{
128 struct bdb_general_features *general;
129
130 /* Set sensible defaults in case we can't find the general block */
131 dev_priv->int_tv_support = 1;
132 dev_priv->int_crt_support = 1;
133
134 general = find_section(bdb, BDB_GENERAL_FEATURES);
135 if (general) {
136 dev_priv->int_tv_support = general->int_tv_support;
137 dev_priv->int_crt_support = general->int_crt_support;
138 }
139}
140
141/**
142 * intel_init_bios - initialize VBIOS settings & find VBT
143 * @dev: DRM device
144 *
145 * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
146 * to appropriate values.
147 *
148 * VBT existence is a sanity check that is relied on by other i830_bios.c code.
149 * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
150 * feed an updated VBT back through that, compared to what we'll fetch using
151 * this method of groping around in the BIOS data.
152 *
153 * Returns 0 on success, nonzero on failure.
154 */
155bool
156intel_init_bios(struct drm_device *dev)
157{
158 struct drm_i915_private *dev_priv = dev->dev_private;
159 struct pci_dev *pdev = dev->pdev;
160 struct vbt_header *vbt = NULL;
161 struct bdb_header *bdb;
162 u8 __iomem *bios;
163 size_t size;
164 int i;
165
166 bios = pci_map_rom(pdev, &size);
167 if (!bios)
168 return -1;
169
170 /* Scour memory looking for the VBT signature */
171 for (i = 0; i + 4 < size; i++) {
172 if (!memcmp(bios + i, "$VBT", 4)) {
173 vbt = (struct vbt_header *)(bios + i);
174 break;
175 }
176 }
177
178 if (!vbt) {
179 DRM_ERROR("VBT signature missing\n");
180 pci_unmap_rom(pdev, bios);
181 return -1;
182 }
183
184 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
185
186 /* Grab useful general definitions */
187 parse_general_features(dev_priv, bdb);
188 parse_panel_data(dev_priv, bdb);
189
190 pci_unmap_rom(pdev, bios);
191
192 return 0;
193}
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