1 /*
2 * Copyright (c) 2006 Intel Corporation
3 *
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.
7 *
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
11 * more details.
12 *
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.
16 *
17 * Authors:
18 * Eric Anholt <eric@anholt.net>
19 *
20 */
21 #include <drm/drmP.h>
22 #include <drm/drm.h>
23 #include "psb_drm.h"
24 #include "psb_drv.h"
25 #include "psb_intel_drv.h"
26 #include "psb_intel_reg.h"
27 #include "psb_intel_bios.h"
28
29
find_section(struct bdb_header * bdb,int section_id)30 static void *find_section(struct bdb_header *bdb, int section_id)
31 {
32 u8 *base = (u8 *)bdb;
33 int index = 0;
34 u16 total, current_size;
35 u8 current_id;
36
37 /* skip to first section */
38 index += bdb->header_size;
39 total = bdb->bdb_size;
40
41 /* walk the sections looking for section_id */
42 while (index < total) {
43 current_id = *(base + index);
44 index++;
45 current_size = *((u16 *)(base + index));
46 index += 2;
47 if (current_id == section_id)
48 return base + index;
49 index += current_size;
50 }
51
52 return NULL;
53 }
54
fill_detail_timing_data(struct drm_display_mode * panel_fixed_mode,struct lvds_dvo_timing * dvo_timing)55 static void fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
56 struct lvds_dvo_timing *dvo_timing)
57 {
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);
66
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;
77
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;
83
84 drm_mode_set_name(panel_fixed_mode);
85 }
86
parse_backlight_data(struct drm_psb_private * dev_priv,struct bdb_header * bdb)87 static void parse_backlight_data(struct drm_psb_private *dev_priv,
88 struct bdb_header *bdb)
89 {
90 struct bdb_lvds_backlight *vbt_lvds_bl = NULL;
91 struct bdb_lvds_backlight *lvds_bl;
92 u8 p_type = 0;
93 void *bl_start = NULL;
94 struct bdb_lvds_options *lvds_opts
95 = find_section(bdb, BDB_LVDS_OPTIONS);
96
97 dev_priv->lvds_bl = NULL;
98
99 if (lvds_opts) {
100 DRM_DEBUG("lvds_options found at %p\n", lvds_opts);
101 p_type = lvds_opts->panel_type;
102 } else {
103 DRM_DEBUG("no lvds_options\n");
104 return;
105 }
106
107 bl_start = find_section(bdb, BDB_LVDS_BACKLIGHT);
108 vbt_lvds_bl = (struct bdb_lvds_backlight *)(bl_start + 1) + p_type;
109
110 lvds_bl = kzalloc(sizeof(*vbt_lvds_bl), GFP_KERNEL);
111 if (!lvds_bl) {
112 DRM_DEBUG("No memory\n");
113 return;
114 }
115
116 memcpy(lvds_bl, vbt_lvds_bl, sizeof(*vbt_lvds_bl));
117
118 dev_priv->lvds_bl = lvds_bl;
119 }
120
121 /* Try to find integrated panel data */
parse_lfp_panel_data(struct drm_psb_private * dev_priv,struct bdb_header * bdb)122 static void parse_lfp_panel_data(struct drm_psb_private *dev_priv,
123 struct bdb_header *bdb)
124 {
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;
130
131 /* Defaults if we can't find VBT info */
132 dev_priv->lvds_dither = 0;
133 dev_priv->lvds_vbt = 0;
134
135 lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
136 if (!lvds_options)
137 return;
138
139 dev_priv->lvds_dither = lvds_options->pixel_dither;
140 if (lvds_options->panel_type == 0xff)
141 return;
142
143 lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
144 if (!lvds_lfp_data)
145 return;
146
147 dev_priv->lvds_vbt = 1;
148
149 entry = &lvds_lfp_data->data[lvds_options->panel_type];
150 dvo_timing = &entry->dvo_timing;
151
152 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode),
153 GFP_KERNEL);
154
155 fill_detail_timing_data(panel_fixed_mode, dvo_timing);
156
157 dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
158
159 DRM_DEBUG("Found panel mode in BIOS VBT tables:\n");
160 drm_mode_debug_printmodeline(panel_fixed_mode);
161
162 return;
163 }
164
165 /* Try to find sdvo panel data */
parse_sdvo_panel_data(struct drm_psb_private * dev_priv,struct bdb_header * bdb)166 static void parse_sdvo_panel_data(struct drm_psb_private *dev_priv,
167 struct bdb_header *bdb)
168 {
169 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
170 struct lvds_dvo_timing *dvo_timing;
171 struct drm_display_mode *panel_fixed_mode;
172
173 dev_priv->sdvo_lvds_vbt_mode = NULL;
174
175 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
176 if (!sdvo_lvds_options)
177 return;
178
179 dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
180 if (!dvo_timing)
181 return;
182
183 panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
184
185 if (!panel_fixed_mode)
186 return;
187
188 fill_detail_timing_data(panel_fixed_mode,
189 dvo_timing + sdvo_lvds_options->panel_type);
190
191 dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
192
193 return;
194 }
195
parse_general_features(struct drm_psb_private * dev_priv,struct bdb_header * bdb)196 static void parse_general_features(struct drm_psb_private *dev_priv,
197 struct bdb_header *bdb)
198 {
199 struct bdb_general_features *general;
200
201 /* Set sensible defaults in case we can't find the general block */
202 dev_priv->int_tv_support = 1;
203 dev_priv->int_crt_support = 1;
204
205 general = find_section(bdb, BDB_GENERAL_FEATURES);
206 if (general) {
207 dev_priv->int_tv_support = general->int_tv_support;
208 dev_priv->int_crt_support = general->int_crt_support;
209 dev_priv->lvds_use_ssc = general->enable_ssc;
210
211 if (dev_priv->lvds_use_ssc) {
212 dev_priv->lvds_ssc_freq
213 = general->ssc_freq ? 100 : 96;
214 }
215 }
216 }
217
218 /**
219 * psb_intel_init_bios - initialize VBIOS settings & find VBT
220 * @dev: DRM device
221 *
222 * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
223 * to appropriate values.
224 *
225 * VBT existence is a sanity check that is relied on by other i830_bios.c code.
226 * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
227 * feed an updated VBT back through that, compared to what we'll fetch using
228 * this method of groping around in the BIOS data.
229 *
230 * Returns 0 on success, nonzero on failure.
231 */
psb_intel_init_bios(struct drm_device * dev)232 bool psb_intel_init_bios(struct drm_device *dev)
233 {
234 struct drm_psb_private *dev_priv = dev->dev_private;
235 struct pci_dev *pdev = dev->pdev;
236 struct vbt_header *vbt = NULL;
237 struct bdb_header *bdb;
238 u8 __iomem *bios;
239 size_t size;
240 int i;
241
242 bios = pci_map_rom(pdev, &size);
243 if (!bios)
244 return -1;
245
246 /* Scour memory looking for the VBT signature */
247 for (i = 0; i + 4 < size; i++) {
248 if (!memcmp(bios + i, "$VBT", 4)) {
249 vbt = (struct vbt_header *)(bios + i);
250 break;
251 }
252 }
253
254 if (!vbt) {
255 DRM_ERROR("VBT signature missing\n");
256 pci_unmap_rom(pdev, bios);
257 return -1;
258 }
259
260 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
261
262 /* Grab useful general definitions */
263 parse_general_features(dev_priv, bdb);
264 parse_lfp_panel_data(dev_priv, bdb);
265 parse_sdvo_panel_data(dev_priv, bdb);
266 parse_backlight_data(dev_priv, bdb);
267
268 pci_unmap_rom(pdev, bios);
269
270 return 0;
271 }
272
273 /**
274 * Destroy and free VBT data
275 */
psb_intel_destroy_bios(struct drm_device * dev)276 void psb_intel_destroy_bios(struct drm_device *dev)
277 {
278 struct drm_psb_private *dev_priv = dev->dev_private;
279 struct drm_display_mode *sdvo_lvds_vbt_mode =
280 dev_priv->sdvo_lvds_vbt_mode;
281 struct drm_display_mode *lfp_lvds_vbt_mode =
282 dev_priv->lfp_lvds_vbt_mode;
283 struct bdb_lvds_backlight *lvds_bl =
284 dev_priv->lvds_bl;
285
286 /*free sdvo panel mode*/
287 if (sdvo_lvds_vbt_mode) {
288 dev_priv->sdvo_lvds_vbt_mode = NULL;
289 kfree(sdvo_lvds_vbt_mode);
290 }
291
292 if (lfp_lvds_vbt_mode) {
293 dev_priv->lfp_lvds_vbt_mode = NULL;
294 kfree(lfp_lvds_vbt_mode);
295 }
296
297 if (lvds_bl) {
298 dev_priv->lvds_bl = NULL;
299 kfree(lvds_bl);
300 }
301 }
302