drm/i915: Use the GM45 VGA hotplug workaround on G45 as well.
[linux-2.6] / 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 /* 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
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
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;
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                 }
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 }