blob: fc28e2bbd5427e6030869724dfb9bd20b5797451 [file] [log] [blame]
Jesse Barnes79e53942008-11-07 14:24:08 -08001/*
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
Jesse Barnes37df9672009-02-23 15:36:42 -0800114 /* 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 Barnes79e53942008-11-07 14:24:08 -0800120 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
130static void
131parse_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 Høgsberg43565a02009-02-13 20:56:52 -0500144 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 Barnes79e53942008-11-07 14:24:08 -0800152 }
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 */
169bool
170intel_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}