2 * Copyright (c) 2006 Intel Corporation
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18 * Eric Anholt <eric@anholt.net>
25 #include "psb_intel_drv.h"
26 #include "psb_intel_reg.h"
27 #include "psb_intel_bios.h"
30 static void *find_section(struct bdb_header *bdb, int section_id)
34 u16 total, current_size;
37 /* skip to first section */
38 index += bdb->header_size;
39 total = bdb->bdb_size;
41 /* walk the sections looking for section_id */
42 while (index < total) {
43 current_id = *(base + index);
45 current_size = *((u16 *)(base + index));
47 if (current_id == section_id)
49 index += current_size;
55 static void fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
56 struct lvds_dvo_timing *dvo_timing)
58 panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
59 dvo_timing->hactive_lo;
60 panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
61 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
62 panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
63 dvo_timing->hsync_pulse_width;
64 panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
65 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
67 panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
68 dvo_timing->vactive_lo;
69 panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
70 dvo_timing->vsync_off;
71 panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
72 dvo_timing->vsync_pulse_width;
73 panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
74 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
75 panel_fixed_mode->clock = dvo_timing->clock * 10;
76 panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
78 /* Some VBTs have bogus h/vtotal values */
79 if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
80 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
81 if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
82 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
84 drm_mode_set_name(panel_fixed_mode);
87 static void parse_backlight_data(struct drm_psb_private *dev_priv,
88 struct bdb_header *bdb)
90 struct bdb_lvds_backlight *vbt_lvds_bl = NULL;
91 struct bdb_lvds_backlight *lvds_bl;
93 void *bl_start = NULL;
94 struct bdb_lvds_options *lvds_opts
95 = find_section(bdb, BDB_LVDS_OPTIONS);
97 dev_priv->lvds_bl = NULL;
100 DRM_DEBUG("lvds_options found at %p\n", lvds_opts);
101 p_type = lvds_opts->panel_type;
103 DRM_DEBUG("no lvds_options\n");
107 bl_start = find_section(bdb, BDB_LVDS_BACKLIGHT);
108 vbt_lvds_bl = (struct bdb_lvds_backlight *)(bl_start + 1) + p_type;
110 lvds_bl = kzalloc(sizeof(*vbt_lvds_bl), GFP_KERNEL);
112 DRM_DEBUG("No memory\n");
116 memcpy(lvds_bl, vbt_lvds_bl, sizeof(*vbt_lvds_bl));
118 dev_priv->lvds_bl = lvds_bl;
121 /* Try to find integrated panel data */
122 static void parse_lfp_panel_data(struct drm_psb_private *dev_priv,
123 struct bdb_header *bdb)
125 struct bdb_lvds_options *lvds_options;
126 struct bdb_lvds_lfp_data *lvds_lfp_data;
127 struct bdb_lvds_lfp_data_entry *entry;
128 struct lvds_dvo_timing *dvo_timing;
129 struct drm_display_mode *panel_fixed_mode;
131 /* Defaults if we can't find VBT info */
132 dev_priv->lvds_dither = 0;
133 dev_priv->lvds_vbt = 0;
135 lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
139 dev_priv->lvds_dither = lvds_options->pixel_dither;
140 if (lvds_options->panel_type == 0xff)
143 lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
147 dev_priv->lvds_vbt = 1;
149 entry = &lvds_lfp_data->data[lvds_options->panel_type];
150 dvo_timing = &entry->dvo_timing;
152 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode),
155 fill_detail_timing_data(panel_fixed_mode, dvo_timing);
157 if (panel_fixed_mode->htotal > 0 && panel_fixed_mode->vtotal > 0) {
158 dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
159 DRM_DEBUG("Found panel mode in BIOS VBT tables:\n");
160 drm_mode_debug_printmodeline(panel_fixed_mode);
162 DRM_DEBUG("Ignoring bogus LVDS VBT mode.\n");
163 dev_priv->lvds_vbt = 0;
164 kfree(panel_fixed_mode);
170 /* Try to find sdvo panel data */
171 static void parse_sdvo_panel_data(struct drm_psb_private *dev_priv,
172 struct bdb_header *bdb)
174 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
175 struct lvds_dvo_timing *dvo_timing;
176 struct drm_display_mode *panel_fixed_mode;
178 dev_priv->sdvo_lvds_vbt_mode = NULL;
180 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
181 if (!sdvo_lvds_options)
184 dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
188 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
190 if (!panel_fixed_mode)
193 fill_detail_timing_data(panel_fixed_mode,
194 dvo_timing + sdvo_lvds_options->panel_type);
196 dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
201 static void parse_general_features(struct drm_psb_private *dev_priv,
202 struct bdb_header *bdb)
204 struct bdb_general_features *general;
206 /* Set sensible defaults in case we can't find the general block */
207 dev_priv->int_tv_support = 1;
208 dev_priv->int_crt_support = 1;
210 general = find_section(bdb, BDB_GENERAL_FEATURES);
212 dev_priv->int_tv_support = general->int_tv_support;
213 dev_priv->int_crt_support = general->int_crt_support;
214 dev_priv->lvds_use_ssc = general->enable_ssc;
216 if (dev_priv->lvds_use_ssc) {
217 dev_priv->lvds_ssc_freq
218 = general->ssc_freq ? 100 : 96;
224 * psb_intel_init_bios - initialize VBIOS settings & find VBT
227 * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
228 * to appropriate values.
230 * VBT existence is a sanity check that is relied on by other i830_bios.c code.
231 * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
232 * feed an updated VBT back through that, compared to what we'll fetch using
233 * this method of groping around in the BIOS data.
235 * Returns 0 on success, nonzero on failure.
237 bool psb_intel_init_bios(struct drm_device *dev)
239 struct drm_psb_private *dev_priv = dev->dev_private;
240 struct pci_dev *pdev = dev->pdev;
241 struct vbt_header *vbt = NULL;
242 struct bdb_header *bdb;
247 bios = pci_map_rom(pdev, &size);
251 /* Scour memory looking for the VBT signature */
252 for (i = 0; i + 4 < size; i++) {
253 if (!memcmp(bios + i, "$VBT", 4)) {
254 vbt = (struct vbt_header *)(bios + i);
260 DRM_ERROR("VBT signature missing\n");
261 pci_unmap_rom(pdev, bios);
265 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
267 /* Grab useful general definitions */
268 parse_general_features(dev_priv, bdb);
269 parse_lfp_panel_data(dev_priv, bdb);
270 parse_sdvo_panel_data(dev_priv, bdb);
271 parse_backlight_data(dev_priv, bdb);
273 pci_unmap_rom(pdev, bios);
279 * Destroy and free VBT data
281 void psb_intel_destroy_bios(struct drm_device *dev)
283 struct drm_psb_private *dev_priv = dev->dev_private;
284 struct drm_display_mode *sdvo_lvds_vbt_mode =
285 dev_priv->sdvo_lvds_vbt_mode;
286 struct drm_display_mode *lfp_lvds_vbt_mode =
287 dev_priv->lfp_lvds_vbt_mode;
288 struct bdb_lvds_backlight *lvds_bl =
291 /*free sdvo panel mode*/
292 if (sdvo_lvds_vbt_mode) {
293 dev_priv->sdvo_lvds_vbt_mode = NULL;
294 kfree(sdvo_lvds_vbt_mode);
297 if (lfp_lvds_vbt_mode) {
298 dev_priv->lfp_lvds_vbt_mode = NULL;
299 kfree(lfp_lvds_vbt_mode);
303 dev_priv->lvds_bl = NULL;