Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/drivers/video/fbmon.c |
| 3 | * |
| 4 | * Copyright (C) 2002 James Simmons <jsimmons@users.sf.net> |
| 5 | * |
| 6 | * Credits: |
| 7 | * |
| 8 | * The EDID Parser is a conglomeration from the following sources: |
| 9 | * |
| 10 | * 1. SciTech SNAP Graphics Architecture |
| 11 | * Copyright (C) 1991-2002 SciTech Software, Inc. All rights reserved. |
| 12 | * |
| 13 | * 2. XFree86 4.3.0, interpret_edid.c |
| 14 | * Copyright 1998 by Egbert Eich <Egbert.Eich@Physik.TU-Darmstadt.DE> |
| 15 | * |
| 16 | * 3. John Fremlin <vii@users.sourceforge.net> and |
| 17 | * Ani Joshi <ajoshi@unixbox.com> |
| 18 | * |
| 19 | * Generalized Timing Formula is derived from: |
| 20 | * |
| 21 | * GTF Spreadsheet by Andy Morrish (1/5/97) |
| 22 | * available at http://www.vesa.org |
| 23 | * |
| 24 | * This file is subject to the terms and conditions of the GNU General Public |
| 25 | * License. See the file COPYING in the main directory of this archive |
| 26 | * for more details. |
| 27 | * |
| 28 | */ |
| 29 | #include <linux/tty.h> |
| 30 | #include <linux/fb.h> |
| 31 | #include <linux/module.h> |
Antonino A. Daplas | 5e518d7 | 2005-09-09 13:04:34 -0700 | [diff] [blame] | 32 | #include <video/edid.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #ifdef CONFIG_PPC_OF |
| 34 | #include <linux/pci.h> |
| 35 | #include <asm/prom.h> |
| 36 | #include <asm/pci-bridge.h> |
| 37 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include "edid.h" |
| 39 | |
| 40 | /* |
| 41 | * EDID parser |
| 42 | */ |
| 43 | |
| 44 | #undef DEBUG /* define this for verbose EDID parsing output */ |
| 45 | |
| 46 | #ifdef DEBUG |
| 47 | #define DPRINTK(fmt, args...) printk(fmt,## args) |
| 48 | #else |
| 49 | #define DPRINTK(fmt, args...) |
| 50 | #endif |
| 51 | |
| 52 | #define FBMON_FIX_HEADER 1 |
| 53 | #define FBMON_FIX_INPUT 2 |
| 54 | |
| 55 | #ifdef CONFIG_FB_MODE_HELPERS |
| 56 | struct broken_edid { |
| 57 | u8 manufacturer[4]; |
| 58 | u32 model; |
| 59 | u32 fix; |
| 60 | }; |
| 61 | |
| 62 | static struct broken_edid brokendb[] = { |
| 63 | /* DEC FR-PCXAV-YZ */ |
| 64 | { |
| 65 | .manufacturer = "DEC", |
| 66 | .model = 0x073a, |
| 67 | .fix = FBMON_FIX_HEADER, |
| 68 | }, |
| 69 | /* ViewSonic PF775a */ |
| 70 | { |
| 71 | .manufacturer = "VSC", |
| 72 | .model = 0x5a44, |
| 73 | .fix = FBMON_FIX_INPUT, |
| 74 | }, |
| 75 | }; |
| 76 | |
| 77 | static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff, |
| 78 | 0xff, 0xff, 0xff, 0x00 |
| 79 | }; |
| 80 | |
| 81 | static void copy_string(unsigned char *c, unsigned char *s) |
| 82 | { |
| 83 | int i; |
| 84 | c = c + 5; |
| 85 | for (i = 0; (i < 13 && *c != 0x0A); i++) |
| 86 | *(s++) = *(c++); |
| 87 | *s = 0; |
| 88 | while (i-- && (*--s == 0x20)) *s = 0; |
| 89 | } |
| 90 | |
| 91 | static int check_edid(unsigned char *edid) |
| 92 | { |
| 93 | unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4]; |
| 94 | unsigned char *b; |
| 95 | u32 model; |
| 96 | int i, fix = 0, ret = 0; |
| 97 | |
| 98 | manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@'; |
| 99 | manufacturer[1] = ((block[0] & 0x03) << 3) + |
| 100 | ((block[1] & 0xe0) >> 5) + '@'; |
| 101 | manufacturer[2] = (block[1] & 0x1f) + '@'; |
| 102 | manufacturer[3] = 0; |
| 103 | model = block[2] + (block[3] << 8); |
| 104 | |
| 105 | for (i = 0; i < ARRAY_SIZE(brokendb); i++) { |
| 106 | if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) && |
| 107 | brokendb[i].model == model) { |
| 108 | printk("fbmon: The EDID Block of " |
| 109 | "Manufacturer: %s Model: 0x%x is known to " |
| 110 | "be broken,\n", manufacturer, model); |
| 111 | fix = brokendb[i].fix; |
| 112 | break; |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | switch (fix) { |
| 117 | case FBMON_FIX_HEADER: |
| 118 | for (i = 0; i < 8; i++) { |
| 119 | if (edid[i] != edid_v1_header[i]) |
| 120 | ret = fix; |
| 121 | } |
| 122 | break; |
| 123 | case FBMON_FIX_INPUT: |
| 124 | b = edid + EDID_STRUCT_DISPLAY; |
| 125 | /* Only if display is GTF capable will |
| 126 | the input type be reset to analog */ |
| 127 | if (b[4] & 0x01 && b[0] & 0x80) |
| 128 | ret = fix; |
| 129 | break; |
| 130 | } |
| 131 | |
| 132 | return ret; |
| 133 | } |
| 134 | |
| 135 | static void fix_edid(unsigned char *edid, int fix) |
| 136 | { |
| 137 | unsigned char *b; |
| 138 | |
| 139 | switch (fix) { |
| 140 | case FBMON_FIX_HEADER: |
| 141 | printk("fbmon: trying a header reconstruct\n"); |
| 142 | memcpy(edid, edid_v1_header, 8); |
| 143 | break; |
| 144 | case FBMON_FIX_INPUT: |
| 145 | printk("fbmon: trying to fix input type\n"); |
| 146 | b = edid + EDID_STRUCT_DISPLAY; |
| 147 | b[0] &= ~0x80; |
| 148 | edid[127] += 0x80; |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | static int edid_checksum(unsigned char *edid) |
| 153 | { |
| 154 | unsigned char i, csum = 0, all_null = 0; |
| 155 | int err = 0, fix = check_edid(edid); |
| 156 | |
| 157 | if (fix) |
| 158 | fix_edid(edid, fix); |
| 159 | |
| 160 | for (i = 0; i < EDID_LENGTH; i++) { |
| 161 | csum += edid[i]; |
| 162 | all_null |= edid[i]; |
| 163 | } |
| 164 | |
| 165 | if (csum == 0x00 && all_null) { |
| 166 | /* checksum passed, everything's good */ |
| 167 | err = 1; |
| 168 | } |
| 169 | |
| 170 | return err; |
| 171 | } |
| 172 | |
| 173 | static int edid_check_header(unsigned char *edid) |
| 174 | { |
| 175 | int i, err = 1, fix = check_edid(edid); |
| 176 | |
| 177 | if (fix) |
| 178 | fix_edid(edid, fix); |
| 179 | |
| 180 | for (i = 0; i < 8; i++) { |
| 181 | if (edid[i] != edid_v1_header[i]) |
| 182 | err = 0; |
| 183 | } |
| 184 | |
| 185 | return err; |
| 186 | } |
| 187 | |
| 188 | static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs) |
| 189 | { |
| 190 | specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@'; |
| 191 | specs->manufacturer[1] = ((block[0] & 0x03) << 3) + |
| 192 | ((block[1] & 0xe0) >> 5) + '@'; |
| 193 | specs->manufacturer[2] = (block[1] & 0x1f) + '@'; |
| 194 | specs->manufacturer[3] = 0; |
| 195 | specs->model = block[2] + (block[3] << 8); |
| 196 | specs->serial = block[4] + (block[5] << 8) + |
| 197 | (block[6] << 16) + (block[7] << 24); |
| 198 | specs->year = block[9] + 1990; |
| 199 | specs->week = block[8]; |
| 200 | DPRINTK(" Manufacturer: %s\n", specs->manufacturer); |
| 201 | DPRINTK(" Model: %x\n", specs->model); |
| 202 | DPRINTK(" Serial#: %u\n", specs->serial); |
| 203 | DPRINTK(" Year: %u Week %u\n", specs->year, specs->week); |
| 204 | } |
| 205 | |
| 206 | static void get_dpms_capabilities(unsigned char flags, |
| 207 | struct fb_monspecs *specs) |
| 208 | { |
| 209 | specs->dpms = 0; |
| 210 | if (flags & DPMS_ACTIVE_OFF) |
| 211 | specs->dpms |= FB_DPMS_ACTIVE_OFF; |
| 212 | if (flags & DPMS_SUSPEND) |
| 213 | specs->dpms |= FB_DPMS_SUSPEND; |
| 214 | if (flags & DPMS_STANDBY) |
| 215 | specs->dpms |= FB_DPMS_STANDBY; |
| 216 | DPRINTK(" DPMS: Active %s, Suspend %s, Standby %s\n", |
| 217 | (flags & DPMS_ACTIVE_OFF) ? "yes" : "no", |
| 218 | (flags & DPMS_SUSPEND) ? "yes" : "no", |
| 219 | (flags & DPMS_STANDBY) ? "yes" : "no"); |
| 220 | } |
| 221 | |
| 222 | static void get_chroma(unsigned char *block, struct fb_monspecs *specs) |
| 223 | { |
| 224 | int tmp; |
| 225 | |
| 226 | DPRINTK(" Chroma\n"); |
| 227 | /* Chromaticity data */ |
| 228 | tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2); |
| 229 | tmp *= 1000; |
| 230 | tmp += 512; |
| 231 | specs->chroma.redx = tmp/1024; |
| 232 | DPRINTK(" RedX: 0.%03d ", specs->chroma.redx); |
| 233 | |
| 234 | tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2); |
| 235 | tmp *= 1000; |
| 236 | tmp += 512; |
| 237 | specs->chroma.redy = tmp/1024; |
| 238 | DPRINTK("RedY: 0.%03d\n", specs->chroma.redy); |
| 239 | |
| 240 | tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2); |
| 241 | tmp *= 1000; |
| 242 | tmp += 512; |
| 243 | specs->chroma.greenx = tmp/1024; |
| 244 | DPRINTK(" GreenX: 0.%03d ", specs->chroma.greenx); |
| 245 | |
| 246 | tmp = (block[5] & 3) | (block[0xa] << 2); |
| 247 | tmp *= 1000; |
| 248 | tmp += 512; |
| 249 | specs->chroma.greeny = tmp/1024; |
| 250 | DPRINTK("GreenY: 0.%03d\n", specs->chroma.greeny); |
| 251 | |
| 252 | tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2); |
| 253 | tmp *= 1000; |
| 254 | tmp += 512; |
| 255 | specs->chroma.bluex = tmp/1024; |
| 256 | DPRINTK(" BlueX: 0.%03d ", specs->chroma.bluex); |
| 257 | |
| 258 | tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2); |
| 259 | tmp *= 1000; |
| 260 | tmp += 512; |
| 261 | specs->chroma.bluey = tmp/1024; |
| 262 | DPRINTK("BlueY: 0.%03d\n", specs->chroma.bluey); |
| 263 | |
| 264 | tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2); |
| 265 | tmp *= 1000; |
| 266 | tmp += 512; |
| 267 | specs->chroma.whitex = tmp/1024; |
| 268 | DPRINTK(" WhiteX: 0.%03d ", specs->chroma.whitex); |
| 269 | |
| 270 | tmp = (block[6] & 3) | (block[0xe] << 2); |
| 271 | tmp *= 1000; |
| 272 | tmp += 512; |
| 273 | specs->chroma.whitey = tmp/1024; |
| 274 | DPRINTK("WhiteY: 0.%03d\n", specs->chroma.whitey); |
| 275 | } |
| 276 | |
| 277 | static int edid_is_serial_block(unsigned char *block) |
| 278 | { |
| 279 | if ((block[0] == 0x00) && (block[1] == 0x00) && |
| 280 | (block[2] == 0x00) && (block[3] == 0xff) && |
| 281 | (block[4] == 0x00)) |
| 282 | return 1; |
| 283 | else |
| 284 | return 0; |
| 285 | } |
| 286 | |
| 287 | static int edid_is_ascii_block(unsigned char *block) |
| 288 | { |
| 289 | if ((block[0] == 0x00) && (block[1] == 0x00) && |
| 290 | (block[2] == 0x00) && (block[3] == 0xfe) && |
| 291 | (block[4] == 0x00)) |
| 292 | return 1; |
| 293 | else |
| 294 | return 0; |
| 295 | } |
| 296 | |
| 297 | static int edid_is_limits_block(unsigned char *block) |
| 298 | { |
| 299 | if ((block[0] == 0x00) && (block[1] == 0x00) && |
| 300 | (block[2] == 0x00) && (block[3] == 0xfd) && |
| 301 | (block[4] == 0x00)) |
| 302 | return 1; |
| 303 | else |
| 304 | return 0; |
| 305 | } |
| 306 | |
| 307 | static int edid_is_monitor_block(unsigned char *block) |
| 308 | { |
| 309 | if ((block[0] == 0x00) && (block[1] == 0x00) && |
| 310 | (block[2] == 0x00) && (block[3] == 0xfc) && |
| 311 | (block[4] == 0x00)) |
| 312 | return 1; |
| 313 | else |
| 314 | return 0; |
| 315 | } |
| 316 | |
Antonino A. Daplas | 61ab790 | 2005-09-09 13:10:02 -0700 | [diff] [blame] | 317 | static void calc_mode_timings(int xres, int yres, int refresh, |
| 318 | struct fb_videomode *mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | { |
| 320 | struct fb_var_screeninfo var; |
| 321 | struct fb_info info; |
| 322 | |
Antonino A. Daplas | 61ab790 | 2005-09-09 13:10:02 -0700 | [diff] [blame] | 323 | memset(&var, 0, sizeof(struct fb_var_screeninfo)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | var.xres = xres; |
| 325 | var.yres = yres; |
| 326 | fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, |
| 327 | refresh, &var, &info); |
| 328 | mode->xres = xres; |
| 329 | mode->yres = yres; |
| 330 | mode->pixclock = var.pixclock; |
| 331 | mode->refresh = refresh; |
| 332 | mode->left_margin = var.left_margin; |
| 333 | mode->right_margin = var.right_margin; |
| 334 | mode->upper_margin = var.upper_margin; |
| 335 | mode->lower_margin = var.lower_margin; |
| 336 | mode->hsync_len = var.hsync_len; |
| 337 | mode->vsync_len = var.vsync_len; |
| 338 | mode->vmode = 0; |
| 339 | mode->sync = 0; |
| 340 | } |
| 341 | |
| 342 | static int get_est_timing(unsigned char *block, struct fb_videomode *mode) |
| 343 | { |
| 344 | int num = 0; |
| 345 | unsigned char c; |
| 346 | |
| 347 | c = block[0]; |
| 348 | if (c&0x80) { |
| 349 | calc_mode_timings(720, 400, 70, &mode[num]); |
| 350 | mode[num++].flag = FB_MODE_IS_CALCULATED; |
| 351 | DPRINTK(" 720x400@70Hz\n"); |
| 352 | } |
| 353 | if (c&0x40) { |
| 354 | calc_mode_timings(720, 400, 88, &mode[num]); |
| 355 | mode[num++].flag = FB_MODE_IS_CALCULATED; |
| 356 | DPRINTK(" 720x400@88Hz\n"); |
| 357 | } |
| 358 | if (c&0x20) { |
| 359 | mode[num++] = vesa_modes[3]; |
| 360 | DPRINTK(" 640x480@60Hz\n"); |
| 361 | } |
| 362 | if (c&0x10) { |
| 363 | calc_mode_timings(640, 480, 67, &mode[num]); |
| 364 | mode[num++].flag = FB_MODE_IS_CALCULATED; |
| 365 | DPRINTK(" 640x480@67Hz\n"); |
| 366 | } |
| 367 | if (c&0x08) { |
| 368 | mode[num++] = vesa_modes[4]; |
| 369 | DPRINTK(" 640x480@72Hz\n"); |
| 370 | } |
| 371 | if (c&0x04) { |
| 372 | mode[num++] = vesa_modes[5]; |
| 373 | DPRINTK(" 640x480@75Hz\n"); |
| 374 | } |
| 375 | if (c&0x02) { |
| 376 | mode[num++] = vesa_modes[7]; |
| 377 | DPRINTK(" 800x600@56Hz\n"); |
| 378 | } |
| 379 | if (c&0x01) { |
| 380 | mode[num++] = vesa_modes[8]; |
| 381 | DPRINTK(" 800x600@60Hz\n"); |
| 382 | } |
| 383 | |
| 384 | c = block[1]; |
| 385 | if (c&0x80) { |
| 386 | mode[num++] = vesa_modes[9]; |
| 387 | DPRINTK(" 800x600@72Hz\n"); |
| 388 | } |
| 389 | if (c&0x40) { |
| 390 | mode[num++] = vesa_modes[10]; |
| 391 | DPRINTK(" 800x600@75Hz\n"); |
| 392 | } |
| 393 | if (c&0x20) { |
| 394 | calc_mode_timings(832, 624, 75, &mode[num]); |
| 395 | mode[num++].flag = FB_MODE_IS_CALCULATED; |
| 396 | DPRINTK(" 832x624@75Hz\n"); |
| 397 | } |
| 398 | if (c&0x10) { |
| 399 | mode[num++] = vesa_modes[12]; |
| 400 | DPRINTK(" 1024x768@87Hz Interlaced\n"); |
| 401 | } |
| 402 | if (c&0x08) { |
| 403 | mode[num++] = vesa_modes[13]; |
| 404 | DPRINTK(" 1024x768@60Hz\n"); |
| 405 | } |
| 406 | if (c&0x04) { |
| 407 | mode[num++] = vesa_modes[14]; |
| 408 | DPRINTK(" 1024x768@70Hz\n"); |
| 409 | } |
| 410 | if (c&0x02) { |
| 411 | mode[num++] = vesa_modes[15]; |
| 412 | DPRINTK(" 1024x768@75Hz\n"); |
| 413 | } |
| 414 | if (c&0x01) { |
| 415 | mode[num++] = vesa_modes[21]; |
| 416 | DPRINTK(" 1280x1024@75Hz\n"); |
| 417 | } |
| 418 | c = block[2]; |
| 419 | if (c&0x80) { |
| 420 | mode[num++] = vesa_modes[17]; |
| 421 | DPRINTK(" 1152x870@75Hz\n"); |
| 422 | } |
| 423 | DPRINTK(" Manufacturer's mask: %x\n",c&0x7F); |
| 424 | return num; |
| 425 | } |
| 426 | |
| 427 | static int get_std_timing(unsigned char *block, struct fb_videomode *mode) |
| 428 | { |
| 429 | int xres, yres = 0, refresh, ratio, i; |
| 430 | |
| 431 | xres = (block[0] + 31) * 8; |
| 432 | if (xres <= 256) |
| 433 | return 0; |
| 434 | |
| 435 | ratio = (block[1] & 0xc0) >> 6; |
| 436 | switch (ratio) { |
| 437 | case 0: |
| 438 | yres = xres; |
| 439 | break; |
| 440 | case 1: |
| 441 | yres = (xres * 3)/4; |
| 442 | break; |
| 443 | case 2: |
| 444 | yres = (xres * 4)/5; |
| 445 | break; |
| 446 | case 3: |
| 447 | yres = (xres * 9)/16; |
| 448 | break; |
| 449 | } |
| 450 | refresh = (block[1] & 0x3f) + 60; |
| 451 | |
| 452 | DPRINTK(" %dx%d@%dHz\n", xres, yres, refresh); |
| 453 | for (i = 0; i < VESA_MODEDB_SIZE; i++) { |
| 454 | if (vesa_modes[i].xres == xres && |
| 455 | vesa_modes[i].yres == yres && |
| 456 | vesa_modes[i].refresh == refresh) { |
| 457 | *mode = vesa_modes[i]; |
| 458 | mode->flag |= FB_MODE_IS_STANDARD; |
| 459 | return 1; |
| 460 | } |
| 461 | } |
| 462 | calc_mode_timings(xres, yres, refresh, mode); |
| 463 | return 1; |
| 464 | } |
| 465 | |
| 466 | static int get_dst_timing(unsigned char *block, |
| 467 | struct fb_videomode *mode) |
| 468 | { |
| 469 | int j, num = 0; |
| 470 | |
| 471 | for (j = 0; j < 6; j++, block+= STD_TIMING_DESCRIPTION_SIZE) |
| 472 | num += get_std_timing(block, &mode[num]); |
| 473 | |
| 474 | return num; |
| 475 | } |
| 476 | |
| 477 | static void get_detailed_timing(unsigned char *block, |
| 478 | struct fb_videomode *mode) |
| 479 | { |
| 480 | mode->xres = H_ACTIVE; |
| 481 | mode->yres = V_ACTIVE; |
| 482 | mode->pixclock = PIXEL_CLOCK; |
| 483 | mode->pixclock /= 1000; |
| 484 | mode->pixclock = KHZ2PICOS(mode->pixclock); |
| 485 | mode->right_margin = H_SYNC_OFFSET; |
| 486 | mode->left_margin = (H_ACTIVE + H_BLANKING) - |
| 487 | (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH); |
| 488 | mode->upper_margin = V_BLANKING - V_SYNC_OFFSET - |
| 489 | V_SYNC_WIDTH; |
| 490 | mode->lower_margin = V_SYNC_OFFSET; |
| 491 | mode->hsync_len = H_SYNC_WIDTH; |
| 492 | mode->vsync_len = V_SYNC_WIDTH; |
| 493 | if (HSYNC_POSITIVE) |
| 494 | mode->sync |= FB_SYNC_HOR_HIGH_ACT; |
| 495 | if (VSYNC_POSITIVE) |
| 496 | mode->sync |= FB_SYNC_VERT_HIGH_ACT; |
| 497 | mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) * |
| 498 | (V_ACTIVE + V_BLANKING)); |
| 499 | mode->vmode = 0; |
| 500 | mode->flag = FB_MODE_IS_DETAILED; |
| 501 | |
| 502 | DPRINTK(" %d MHz ", PIXEL_CLOCK/1000000); |
| 503 | DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET, |
| 504 | H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING); |
| 505 | DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET, |
| 506 | V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING); |
| 507 | DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-", |
| 508 | (VSYNC_POSITIVE) ? "+" : "-"); |
| 509 | } |
| 510 | |
| 511 | /** |
| 512 | * fb_create_modedb - create video mode database |
| 513 | * @edid: EDID data |
| 514 | * @dbsize: database size |
| 515 | * |
| 516 | * RETURNS: struct fb_videomode, @dbsize contains length of database |
| 517 | * |
| 518 | * DESCRIPTION: |
| 519 | * This function builds a mode database using the contents of the EDID |
| 520 | * data |
| 521 | */ |
| 522 | static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize) |
| 523 | { |
| 524 | struct fb_videomode *mode, *m; |
| 525 | unsigned char *block; |
| 526 | int num = 0, i; |
| 527 | |
| 528 | mode = kmalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL); |
| 529 | if (mode == NULL) |
| 530 | return NULL; |
| 531 | memset(mode, 0, 50 * sizeof(struct fb_videomode)); |
| 532 | |
| 533 | if (edid == NULL || !edid_checksum(edid) || |
| 534 | !edid_check_header(edid)) { |
| 535 | kfree(mode); |
| 536 | return NULL; |
| 537 | } |
| 538 | |
| 539 | *dbsize = 0; |
| 540 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | DPRINTK(" Detailed Timings\n"); |
| 542 | block = edid + DETAILED_TIMING_DESCRIPTIONS_START; |
| 543 | for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) { |
| 544 | int first = 1; |
| 545 | |
Antonino A. Daplas | 14c8102 | 2005-11-07 01:00:53 -0800 | [diff] [blame] | 546 | if (!(block[0] == 0x00 && block[1] == 0x00)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | get_detailed_timing(block, &mode[num]); |
| 548 | if (first) { |
| 549 | mode[num].flag |= FB_MODE_IS_FIRST; |
| 550 | first = 0; |
| 551 | } |
| 552 | num++; |
| 553 | } |
| 554 | } |
Antonino A. Daplas | 14c8102 | 2005-11-07 01:00:53 -0800 | [diff] [blame] | 555 | |
| 556 | DPRINTK(" Supported VESA Modes\n"); |
| 557 | block = edid + ESTABLISHED_TIMING_1; |
| 558 | num += get_est_timing(block, &mode[num]); |
| 559 | |
| 560 | DPRINTK(" Standard Timings\n"); |
| 561 | block = edid + STD_TIMING_DESCRIPTIONS_START; |
| 562 | for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE) |
| 563 | num += get_std_timing(block, &mode[num]); |
| 564 | |
| 565 | block = edid + DETAILED_TIMING_DESCRIPTIONS_START; |
| 566 | for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) { |
| 567 | if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa) |
| 568 | num += get_dst_timing(block + 5, &mode[num]); |
| 569 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | |
| 571 | /* Yikes, EDID data is totally useless */ |
| 572 | if (!num) { |
| 573 | kfree(mode); |
| 574 | return NULL; |
| 575 | } |
| 576 | |
| 577 | *dbsize = num; |
| 578 | m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL); |
| 579 | if (!m) |
| 580 | return mode; |
| 581 | memmove(m, mode, num * sizeof(struct fb_videomode)); |
| 582 | kfree(mode); |
| 583 | return m; |
| 584 | } |
| 585 | |
| 586 | /** |
| 587 | * fb_destroy_modedb - destroys mode database |
| 588 | * @modedb: mode database to destroy |
| 589 | * |
| 590 | * DESCRIPTION: |
| 591 | * Destroy mode database created by fb_create_modedb |
| 592 | */ |
| 593 | void fb_destroy_modedb(struct fb_videomode *modedb) |
| 594 | { |
| 595 | kfree(modedb); |
| 596 | } |
| 597 | |
| 598 | static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs) |
| 599 | { |
| 600 | int i, retval = 1; |
| 601 | unsigned char *block; |
| 602 | |
| 603 | block = edid + DETAILED_TIMING_DESCRIPTIONS_START; |
| 604 | |
| 605 | DPRINTK(" Monitor Operating Limits: "); |
| 606 | for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) { |
| 607 | if (edid_is_limits_block(block)) { |
| 608 | specs->hfmin = H_MIN_RATE * 1000; |
| 609 | specs->hfmax = H_MAX_RATE * 1000; |
| 610 | specs->vfmin = V_MIN_RATE; |
| 611 | specs->vfmax = V_MAX_RATE; |
| 612 | specs->dclkmax = MAX_PIXEL_CLOCK * 1000000; |
| 613 | specs->gtf = (GTF_SUPPORT) ? 1 : 0; |
| 614 | retval = 0; |
| 615 | DPRINTK("From EDID\n"); |
| 616 | break; |
| 617 | } |
| 618 | } |
| 619 | |
| 620 | /* estimate monitor limits based on modes supported */ |
| 621 | if (retval) { |
| 622 | struct fb_videomode *modes; |
| 623 | int num_modes, i, hz, hscan, pixclock; |
| 624 | |
| 625 | modes = fb_create_modedb(edid, &num_modes); |
| 626 | if (!modes) { |
| 627 | DPRINTK("None Available\n"); |
| 628 | return 1; |
| 629 | } |
| 630 | |
| 631 | retval = 0; |
| 632 | for (i = 0; i < num_modes; i++) { |
| 633 | hz = modes[i].refresh; |
| 634 | pixclock = PICOS2KHZ(modes[i].pixclock) * 1000; |
| 635 | hscan = (modes[i].yres * 105 * hz + 5000)/100; |
| 636 | |
| 637 | if (specs->dclkmax == 0 || specs->dclkmax < pixclock) |
| 638 | specs->dclkmax = pixclock; |
| 639 | if (specs->dclkmin == 0 || specs->dclkmin > pixclock) |
| 640 | specs->dclkmin = pixclock; |
| 641 | if (specs->hfmax == 0 || specs->hfmax < hscan) |
| 642 | specs->hfmax = hscan; |
| 643 | if (specs->hfmin == 0 || specs->hfmin > hscan) |
| 644 | specs->hfmin = hscan; |
| 645 | if (specs->vfmax == 0 || specs->vfmax < hz) |
| 646 | specs->vfmax = hz; |
| 647 | if (specs->vfmin == 0 || specs->vfmin > hz) |
| 648 | specs->vfmin = hz; |
| 649 | } |
| 650 | DPRINTK("Extrapolated\n"); |
| 651 | fb_destroy_modedb(modes); |
| 652 | } |
| 653 | DPRINTK(" H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n", |
| 654 | specs->hfmin/1000, specs->hfmax/1000, specs->vfmin, |
| 655 | specs->vfmax, specs->dclkmax/1000000); |
| 656 | return retval; |
| 657 | } |
| 658 | |
| 659 | static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs) |
| 660 | { |
| 661 | unsigned char c, *block; |
| 662 | |
| 663 | block = edid + EDID_STRUCT_DISPLAY; |
| 664 | |
| 665 | fb_get_monitor_limits(edid, specs); |
| 666 | |
| 667 | c = block[0] & 0x80; |
| 668 | specs->input = 0; |
| 669 | if (c) { |
| 670 | specs->input |= FB_DISP_DDI; |
| 671 | DPRINTK(" Digital Display Input"); |
| 672 | } else { |
| 673 | DPRINTK(" Analog Display Input: Input Voltage - "); |
| 674 | switch ((block[0] & 0x60) >> 5) { |
| 675 | case 0: |
| 676 | DPRINTK("0.700V/0.300V"); |
| 677 | specs->input |= FB_DISP_ANA_700_300; |
| 678 | break; |
| 679 | case 1: |
| 680 | DPRINTK("0.714V/0.286V"); |
| 681 | specs->input |= FB_DISP_ANA_714_286; |
| 682 | break; |
| 683 | case 2: |
| 684 | DPRINTK("1.000V/0.400V"); |
| 685 | specs->input |= FB_DISP_ANA_1000_400; |
| 686 | break; |
| 687 | case 3: |
| 688 | DPRINTK("0.700V/0.000V"); |
| 689 | specs->input |= FB_DISP_ANA_700_000; |
| 690 | break; |
| 691 | } |
| 692 | } |
| 693 | DPRINTK("\n Sync: "); |
| 694 | c = block[0] & 0x10; |
| 695 | if (c) |
| 696 | DPRINTK(" Configurable signal level\n"); |
| 697 | c = block[0] & 0x0f; |
| 698 | specs->signal = 0; |
| 699 | if (c & 0x10) { |
| 700 | DPRINTK("Blank to Blank "); |
| 701 | specs->signal |= FB_SIGNAL_BLANK_BLANK; |
| 702 | } |
| 703 | if (c & 0x08) { |
| 704 | DPRINTK("Separate "); |
| 705 | specs->signal |= FB_SIGNAL_SEPARATE; |
| 706 | } |
| 707 | if (c & 0x04) { |
| 708 | DPRINTK("Composite "); |
| 709 | specs->signal |= FB_SIGNAL_COMPOSITE; |
| 710 | } |
| 711 | if (c & 0x02) { |
| 712 | DPRINTK("Sync on Green "); |
| 713 | specs->signal |= FB_SIGNAL_SYNC_ON_GREEN; |
| 714 | } |
| 715 | if (c & 0x01) { |
| 716 | DPRINTK("Serration on "); |
| 717 | specs->signal |= FB_SIGNAL_SERRATION_ON; |
| 718 | } |
| 719 | DPRINTK("\n"); |
| 720 | specs->max_x = block[1]; |
| 721 | specs->max_y = block[2]; |
| 722 | DPRINTK(" Max H-size in cm: "); |
| 723 | if (specs->max_x) |
| 724 | DPRINTK("%d\n", specs->max_x); |
| 725 | else |
| 726 | DPRINTK("variable\n"); |
| 727 | DPRINTK(" Max V-size in cm: "); |
| 728 | if (specs->max_y) |
| 729 | DPRINTK("%d\n", specs->max_y); |
| 730 | else |
| 731 | DPRINTK("variable\n"); |
| 732 | |
| 733 | c = block[3]; |
| 734 | specs->gamma = c+100; |
| 735 | DPRINTK(" Gamma: "); |
| 736 | DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100); |
| 737 | |
| 738 | get_dpms_capabilities(block[4], specs); |
| 739 | |
| 740 | switch ((block[4] & 0x18) >> 3) { |
| 741 | case 0: |
| 742 | DPRINTK(" Monochrome/Grayscale\n"); |
| 743 | specs->input |= FB_DISP_MONO; |
| 744 | break; |
| 745 | case 1: |
| 746 | DPRINTK(" RGB Color Display\n"); |
| 747 | specs->input |= FB_DISP_RGB; |
| 748 | break; |
| 749 | case 2: |
| 750 | DPRINTK(" Non-RGB Multicolor Display\n"); |
| 751 | specs->input |= FB_DISP_MULTI; |
| 752 | break; |
| 753 | default: |
| 754 | DPRINTK(" Unknown\n"); |
| 755 | specs->input |= FB_DISP_UNKNOWN; |
| 756 | break; |
| 757 | } |
| 758 | |
| 759 | get_chroma(block, specs); |
| 760 | |
| 761 | specs->misc = 0; |
| 762 | c = block[4] & 0x7; |
| 763 | if (c & 0x04) { |
| 764 | DPRINTK(" Default color format is primary\n"); |
| 765 | specs->misc |= FB_MISC_PRIM_COLOR; |
| 766 | } |
| 767 | if (c & 0x02) { |
| 768 | DPRINTK(" First DETAILED Timing is preferred\n"); |
| 769 | specs->misc |= FB_MISC_1ST_DETAIL; |
| 770 | } |
| 771 | if (c & 0x01) { |
| 772 | printk(" Display is GTF capable\n"); |
| 773 | specs->gtf = 1; |
| 774 | } |
| 775 | } |
| 776 | |
| 777 | static int edid_is_timing_block(unsigned char *block) |
| 778 | { |
| 779 | if ((block[0] != 0x00) || (block[1] != 0x00) || |
| 780 | (block[2] != 0x00) || (block[4] != 0x00)) |
| 781 | return 1; |
| 782 | else |
| 783 | return 0; |
| 784 | } |
| 785 | |
| 786 | int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var) |
| 787 | { |
| 788 | int i; |
| 789 | unsigned char *block; |
| 790 | |
| 791 | if (edid == NULL || var == NULL) |
| 792 | return 1; |
| 793 | |
| 794 | if (!(edid_checksum(edid))) |
| 795 | return 1; |
| 796 | |
| 797 | if (!(edid_check_header(edid))) |
| 798 | return 1; |
| 799 | |
| 800 | block = edid + DETAILED_TIMING_DESCRIPTIONS_START; |
| 801 | |
| 802 | for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) { |
| 803 | if (edid_is_timing_block(block)) { |
| 804 | var->xres = var->xres_virtual = H_ACTIVE; |
| 805 | var->yres = var->yres_virtual = V_ACTIVE; |
| 806 | var->height = var->width = -1; |
| 807 | var->right_margin = H_SYNC_OFFSET; |
| 808 | var->left_margin = (H_ACTIVE + H_BLANKING) - |
| 809 | (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH); |
| 810 | var->upper_margin = V_BLANKING - V_SYNC_OFFSET - |
| 811 | V_SYNC_WIDTH; |
| 812 | var->lower_margin = V_SYNC_OFFSET; |
| 813 | var->hsync_len = H_SYNC_WIDTH; |
| 814 | var->vsync_len = V_SYNC_WIDTH; |
| 815 | var->pixclock = PIXEL_CLOCK; |
| 816 | var->pixclock /= 1000; |
| 817 | var->pixclock = KHZ2PICOS(var->pixclock); |
| 818 | |
| 819 | if (HSYNC_POSITIVE) |
| 820 | var->sync |= FB_SYNC_HOR_HIGH_ACT; |
| 821 | if (VSYNC_POSITIVE) |
| 822 | var->sync |= FB_SYNC_VERT_HIGH_ACT; |
| 823 | return 0; |
| 824 | } |
| 825 | } |
| 826 | return 1; |
| 827 | } |
| 828 | |
| 829 | void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs) |
| 830 | { |
| 831 | unsigned char *block; |
Antonino A. Daplas | 475666d | 2005-11-07 01:00:46 -0800 | [diff] [blame] | 832 | int i, found = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | |
| 834 | if (edid == NULL) |
| 835 | return; |
| 836 | |
| 837 | if (!(edid_checksum(edid))) |
| 838 | return; |
| 839 | |
| 840 | if (!(edid_check_header(edid))) |
| 841 | return; |
| 842 | |
| 843 | memset(specs, 0, sizeof(struct fb_monspecs)); |
| 844 | |
| 845 | specs->version = edid[EDID_STRUCT_VERSION]; |
| 846 | specs->revision = edid[EDID_STRUCT_REVISION]; |
| 847 | |
| 848 | DPRINTK("========================================\n"); |
| 849 | DPRINTK("Display Information (EDID)\n"); |
| 850 | DPRINTK("========================================\n"); |
| 851 | DPRINTK(" EDID Version %d.%d\n", (int) specs->version, |
| 852 | (int) specs->revision); |
| 853 | |
| 854 | parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs); |
| 855 | |
| 856 | block = edid + DETAILED_TIMING_DESCRIPTIONS_START; |
| 857 | for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) { |
| 858 | if (edid_is_serial_block(block)) { |
| 859 | copy_string(block, specs->serial_no); |
| 860 | DPRINTK(" Serial Number: %s\n", specs->serial_no); |
| 861 | } else if (edid_is_ascii_block(block)) { |
| 862 | copy_string(block, specs->ascii); |
| 863 | DPRINTK(" ASCII Block: %s\n", specs->ascii); |
| 864 | } else if (edid_is_monitor_block(block)) { |
| 865 | copy_string(block, specs->monitor); |
| 866 | DPRINTK(" Monitor Name: %s\n", specs->monitor); |
| 867 | } |
| 868 | } |
| 869 | |
| 870 | DPRINTK(" Display Characteristics:\n"); |
| 871 | get_monspecs(edid, specs); |
| 872 | |
| 873 | specs->modedb = fb_create_modedb(edid, &specs->modedb_len); |
Antonino A. Daplas | 475666d | 2005-11-07 01:00:46 -0800 | [diff] [blame] | 874 | |
| 875 | /* |
| 876 | * Workaround for buggy EDIDs that sets that the first |
| 877 | * detailed timing is preferred but has not detailed |
| 878 | * timing specified |
| 879 | */ |
| 880 | for (i = 0; i < specs->modedb_len; i++) { |
| 881 | if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) { |
| 882 | found = 1; |
| 883 | break; |
| 884 | } |
| 885 | } |
| 886 | |
| 887 | if (!found) |
| 888 | specs->misc &= ~FB_MISC_1ST_DETAIL; |
| 889 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | DPRINTK("========================================\n"); |
| 891 | } |
| 892 | |
| 893 | /* |
| 894 | * VESA Generalized Timing Formula (GTF) |
| 895 | */ |
| 896 | |
| 897 | #define FLYBACK 550 |
| 898 | #define V_FRONTPORCH 1 |
| 899 | #define H_OFFSET 40 |
| 900 | #define H_SCALEFACTOR 20 |
| 901 | #define H_BLANKSCALE 128 |
| 902 | #define H_GRADIENT 600 |
| 903 | #define C_VAL 30 |
| 904 | #define M_VAL 300 |
| 905 | |
| 906 | struct __fb_timings { |
| 907 | u32 dclk; |
| 908 | u32 hfreq; |
| 909 | u32 vfreq; |
| 910 | u32 hactive; |
| 911 | u32 vactive; |
| 912 | u32 hblank; |
| 913 | u32 vblank; |
| 914 | u32 htotal; |
| 915 | u32 vtotal; |
| 916 | }; |
| 917 | |
| 918 | /** |
| 919 | * fb_get_vblank - get vertical blank time |
| 920 | * @hfreq: horizontal freq |
| 921 | * |
| 922 | * DESCRIPTION: |
| 923 | * vblank = right_margin + vsync_len + left_margin |
| 924 | * |
| 925 | * given: right_margin = 1 (V_FRONTPORCH) |
| 926 | * vsync_len = 3 |
| 927 | * flyback = 550 |
| 928 | * |
| 929 | * flyback * hfreq |
| 930 | * left_margin = --------------- - vsync_len |
| 931 | * 1000000 |
| 932 | */ |
| 933 | static u32 fb_get_vblank(u32 hfreq) |
| 934 | { |
| 935 | u32 vblank; |
| 936 | |
| 937 | vblank = (hfreq * FLYBACK)/1000; |
| 938 | vblank = (vblank + 500)/1000; |
| 939 | return (vblank + V_FRONTPORCH); |
| 940 | } |
| 941 | |
| 942 | /** |
| 943 | * fb_get_hblank_by_freq - get horizontal blank time given hfreq |
| 944 | * @hfreq: horizontal freq |
| 945 | * @xres: horizontal resolution in pixels |
| 946 | * |
| 947 | * DESCRIPTION: |
| 948 | * |
| 949 | * xres * duty_cycle |
| 950 | * hblank = ------------------ |
| 951 | * 100 - duty_cycle |
| 952 | * |
| 953 | * duty cycle = percent of htotal assigned to inactive display |
| 954 | * duty cycle = C - (M/Hfreq) |
| 955 | * |
| 956 | * where: C = ((offset - scale factor) * blank_scale) |
| 957 | * -------------------------------------- + scale factor |
| 958 | * 256 |
| 959 | * M = blank_scale * gradient |
| 960 | * |
| 961 | */ |
| 962 | static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres) |
| 963 | { |
| 964 | u32 c_val, m_val, duty_cycle, hblank; |
| 965 | |
| 966 | c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 + |
| 967 | H_SCALEFACTOR) * 1000; |
| 968 | m_val = (H_BLANKSCALE * H_GRADIENT)/256; |
| 969 | m_val = (m_val * 1000000)/hfreq; |
| 970 | duty_cycle = c_val - m_val; |
| 971 | hblank = (xres * duty_cycle)/(100000 - duty_cycle); |
| 972 | return (hblank); |
| 973 | } |
| 974 | |
| 975 | /** |
| 976 | * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock |
| 977 | * @dclk: pixelclock in Hz |
| 978 | * @xres: horizontal resolution in pixels |
| 979 | * |
| 980 | * DESCRIPTION: |
| 981 | * |
| 982 | * xres * duty_cycle |
| 983 | * hblank = ------------------ |
| 984 | * 100 - duty_cycle |
| 985 | * |
| 986 | * duty cycle = percent of htotal assigned to inactive display |
| 987 | * duty cycle = C - (M * h_period) |
| 988 | * |
| 989 | * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100 |
| 990 | * ----------------------------------------------- |
| 991 | * 2 * M |
| 992 | * M = 300; |
| 993 | * C = 30; |
| 994 | |
| 995 | */ |
| 996 | static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres) |
| 997 | { |
| 998 | u32 duty_cycle, h_period, hblank; |
| 999 | |
| 1000 | dclk /= 1000; |
| 1001 | h_period = 100 - C_VAL; |
| 1002 | h_period *= h_period; |
| 1003 | h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk); |
| 1004 | h_period *=10000; |
| 1005 | |
| 1006 | h_period = int_sqrt(h_period); |
| 1007 | h_period -= (100 - C_VAL) * 100; |
| 1008 | h_period *= 1000; |
| 1009 | h_period /= 2 * M_VAL; |
| 1010 | |
| 1011 | duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100; |
| 1012 | hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8; |
| 1013 | hblank &= ~15; |
| 1014 | return (hblank); |
| 1015 | } |
| 1016 | |
| 1017 | /** |
| 1018 | * fb_get_hfreq - estimate hsync |
| 1019 | * @vfreq: vertical refresh rate |
| 1020 | * @yres: vertical resolution |
| 1021 | * |
| 1022 | * DESCRIPTION: |
| 1023 | * |
| 1024 | * (yres + front_port) * vfreq * 1000000 |
| 1025 | * hfreq = ------------------------------------- |
| 1026 | * (1000000 - (vfreq * FLYBACK) |
| 1027 | * |
| 1028 | */ |
| 1029 | |
| 1030 | static u32 fb_get_hfreq(u32 vfreq, u32 yres) |
| 1031 | { |
| 1032 | u32 divisor, hfreq; |
| 1033 | |
| 1034 | divisor = (1000000 - (vfreq * FLYBACK))/1000; |
| 1035 | hfreq = (yres + V_FRONTPORCH) * vfreq * 1000; |
| 1036 | return (hfreq/divisor); |
| 1037 | } |
| 1038 | |
| 1039 | static void fb_timings_vfreq(struct __fb_timings *timings) |
| 1040 | { |
| 1041 | timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive); |
| 1042 | timings->vblank = fb_get_vblank(timings->hfreq); |
| 1043 | timings->vtotal = timings->vactive + timings->vblank; |
| 1044 | timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq, |
| 1045 | timings->hactive); |
| 1046 | timings->htotal = timings->hactive + timings->hblank; |
| 1047 | timings->dclk = timings->htotal * timings->hfreq; |
| 1048 | } |
| 1049 | |
| 1050 | static void fb_timings_hfreq(struct __fb_timings *timings) |
| 1051 | { |
| 1052 | timings->vblank = fb_get_vblank(timings->hfreq); |
| 1053 | timings->vtotal = timings->vactive + timings->vblank; |
| 1054 | timings->vfreq = timings->hfreq/timings->vtotal; |
| 1055 | timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq, |
| 1056 | timings->hactive); |
| 1057 | timings->htotal = timings->hactive + timings->hblank; |
| 1058 | timings->dclk = timings->htotal * timings->hfreq; |
| 1059 | } |
| 1060 | |
| 1061 | static void fb_timings_dclk(struct __fb_timings *timings) |
| 1062 | { |
| 1063 | timings->hblank = fb_get_hblank_by_dclk(timings->dclk, |
| 1064 | timings->hactive); |
| 1065 | timings->htotal = timings->hactive + timings->hblank; |
| 1066 | timings->hfreq = timings->dclk/timings->htotal; |
| 1067 | timings->vblank = fb_get_vblank(timings->hfreq); |
| 1068 | timings->vtotal = timings->vactive + timings->vblank; |
| 1069 | timings->vfreq = timings->hfreq/timings->vtotal; |
| 1070 | } |
| 1071 | |
| 1072 | /* |
| 1073 | * fb_get_mode - calculates video mode using VESA GTF |
| 1074 | * @flags: if: 0 - maximize vertical refresh rate |
| 1075 | * 1 - vrefresh-driven calculation; |
| 1076 | * 2 - hscan-driven calculation; |
| 1077 | * 3 - pixelclock-driven calculation; |
| 1078 | * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock |
| 1079 | * @var: pointer to fb_var_screeninfo |
| 1080 | * @info: pointer to fb_info |
| 1081 | * |
| 1082 | * DESCRIPTION: |
| 1083 | * Calculates video mode based on monitor specs using VESA GTF. |
| 1084 | * The GTF is best for VESA GTF compliant monitors but is |
| 1085 | * specifically formulated to work for older monitors as well. |
| 1086 | * |
| 1087 | * If @flag==0, the function will attempt to maximize the |
| 1088 | * refresh rate. Otherwise, it will calculate timings based on |
| 1089 | * the flag and accompanying value. |
| 1090 | * |
| 1091 | * If FB_IGNOREMON bit is set in @flags, monitor specs will be |
| 1092 | * ignored and @var will be filled with the calculated timings. |
| 1093 | * |
| 1094 | * All calculations are based on the VESA GTF Spreadsheet |
| 1095 | * available at VESA's public ftp (http://www.vesa.org). |
| 1096 | * |
| 1097 | * NOTES: |
| 1098 | * The timings generated by the GTF will be different from VESA |
| 1099 | * DMT. It might be a good idea to keep a table of standard |
| 1100 | * VESA modes as well. The GTF may also not work for some displays, |
| 1101 | * such as, and especially, analog TV. |
| 1102 | * |
| 1103 | * REQUIRES: |
| 1104 | * A valid info->monspecs, otherwise 'safe numbers' will be used. |
| 1105 | */ |
| 1106 | int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info) |
| 1107 | { |
| 1108 | struct __fb_timings timings; |
| 1109 | u32 interlace = 1, dscan = 1; |
| 1110 | u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax; |
| 1111 | |
| 1112 | /* |
| 1113 | * If monspecs are invalid, use values that are enough |
| 1114 | * for 640x480@60 |
| 1115 | */ |
| 1116 | if (!info->monspecs.hfmax || !info->monspecs.vfmax || |
| 1117 | !info->monspecs.dclkmax || |
| 1118 | info->monspecs.hfmax < info->monspecs.hfmin || |
| 1119 | info->monspecs.vfmax < info->monspecs.vfmin || |
| 1120 | info->monspecs.dclkmax < info->monspecs.dclkmin) { |
| 1121 | hfmin = 29000; hfmax = 30000; |
| 1122 | vfmin = 60; vfmax = 60; |
| 1123 | dclkmin = 0; dclkmax = 25000000; |
| 1124 | } else { |
| 1125 | hfmin = info->monspecs.hfmin; |
| 1126 | hfmax = info->monspecs.hfmax; |
| 1127 | vfmin = info->monspecs.vfmin; |
| 1128 | vfmax = info->monspecs.vfmax; |
| 1129 | dclkmin = info->monspecs.dclkmin; |
| 1130 | dclkmax = info->monspecs.dclkmax; |
| 1131 | } |
| 1132 | |
| 1133 | memset(&timings, 0, sizeof(struct __fb_timings)); |
| 1134 | timings.hactive = var->xres; |
| 1135 | timings.vactive = var->yres; |
| 1136 | if (var->vmode & FB_VMODE_INTERLACED) { |
| 1137 | timings.vactive /= 2; |
| 1138 | interlace = 2; |
| 1139 | } |
| 1140 | if (var->vmode & FB_VMODE_DOUBLE) { |
| 1141 | timings.vactive *= 2; |
| 1142 | dscan = 2; |
| 1143 | } |
| 1144 | |
| 1145 | switch (flags & ~FB_IGNOREMON) { |
| 1146 | case FB_MAXTIMINGS: /* maximize refresh rate */ |
| 1147 | timings.hfreq = hfmax; |
| 1148 | fb_timings_hfreq(&timings); |
| 1149 | if (timings.vfreq > vfmax) { |
| 1150 | timings.vfreq = vfmax; |
| 1151 | fb_timings_vfreq(&timings); |
| 1152 | } |
| 1153 | if (timings.dclk > dclkmax) { |
| 1154 | timings.dclk = dclkmax; |
| 1155 | fb_timings_dclk(&timings); |
| 1156 | } |
| 1157 | break; |
| 1158 | case FB_VSYNCTIMINGS: /* vrefresh driven */ |
| 1159 | timings.vfreq = val; |
| 1160 | fb_timings_vfreq(&timings); |
| 1161 | break; |
| 1162 | case FB_HSYNCTIMINGS: /* hsync driven */ |
| 1163 | timings.hfreq = val; |
| 1164 | fb_timings_hfreq(&timings); |
| 1165 | break; |
| 1166 | case FB_DCLKTIMINGS: /* pixelclock driven */ |
| 1167 | timings.dclk = PICOS2KHZ(val) * 1000; |
| 1168 | fb_timings_dclk(&timings); |
| 1169 | break; |
| 1170 | default: |
| 1171 | return -EINVAL; |
| 1172 | |
| 1173 | } |
| 1174 | |
| 1175 | if (!(flags & FB_IGNOREMON) && |
| 1176 | (timings.vfreq < vfmin || timings.vfreq > vfmax || |
| 1177 | timings.hfreq < hfmin || timings.hfreq > hfmax || |
| 1178 | timings.dclk < dclkmin || timings.dclk > dclkmax)) |
| 1179 | return -EINVAL; |
| 1180 | |
| 1181 | var->pixclock = KHZ2PICOS(timings.dclk/1000); |
| 1182 | var->hsync_len = (timings.htotal * 8)/100; |
| 1183 | var->right_margin = (timings.hblank/2) - var->hsync_len; |
| 1184 | var->left_margin = timings.hblank - var->right_margin - var->hsync_len; |
| 1185 | |
| 1186 | var->vsync_len = (3 * interlace)/dscan; |
| 1187 | var->lower_margin = (1 * interlace)/dscan; |
| 1188 | var->upper_margin = (timings.vblank * interlace)/dscan - |
| 1189 | (var->vsync_len + var->lower_margin); |
| 1190 | |
| 1191 | return 0; |
| 1192 | } |
| 1193 | #else |
| 1194 | int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var) |
| 1195 | { |
| 1196 | return 1; |
| 1197 | } |
| 1198 | void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs) |
| 1199 | { |
| 1200 | specs = NULL; |
| 1201 | } |
| 1202 | void fb_destroy_modedb(struct fb_videomode *modedb) |
| 1203 | { |
| 1204 | } |
| 1205 | int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, |
| 1206 | struct fb_info *info) |
| 1207 | { |
| 1208 | return -EINVAL; |
| 1209 | } |
| 1210 | #endif /* CONFIG_FB_MODE_HELPERS */ |
| 1211 | |
| 1212 | /* |
| 1213 | * fb_validate_mode - validates var against monitor capabilities |
| 1214 | * @var: pointer to fb_var_screeninfo |
| 1215 | * @info: pointer to fb_info |
| 1216 | * |
| 1217 | * DESCRIPTION: |
| 1218 | * Validates video mode against monitor capabilities specified in |
| 1219 | * info->monspecs. |
| 1220 | * |
| 1221 | * REQUIRES: |
| 1222 | * A valid info->monspecs. |
| 1223 | */ |
| 1224 | int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info) |
| 1225 | { |
| 1226 | u32 hfreq, vfreq, htotal, vtotal, pixclock; |
| 1227 | u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax; |
| 1228 | |
| 1229 | /* |
| 1230 | * If monspecs are invalid, use values that are enough |
| 1231 | * for 640x480@60 |
| 1232 | */ |
| 1233 | if (!info->monspecs.hfmax || !info->monspecs.vfmax || |
| 1234 | !info->monspecs.dclkmax || |
| 1235 | info->monspecs.hfmax < info->monspecs.hfmin || |
| 1236 | info->monspecs.vfmax < info->monspecs.vfmin || |
| 1237 | info->monspecs.dclkmax < info->monspecs.dclkmin) { |
| 1238 | hfmin = 29000; hfmax = 30000; |
| 1239 | vfmin = 60; vfmax = 60; |
| 1240 | dclkmin = 0; dclkmax = 25000000; |
| 1241 | } else { |
| 1242 | hfmin = info->monspecs.hfmin; |
| 1243 | hfmax = info->monspecs.hfmax; |
| 1244 | vfmin = info->monspecs.vfmin; |
| 1245 | vfmax = info->monspecs.vfmax; |
| 1246 | dclkmin = info->monspecs.dclkmin; |
| 1247 | dclkmax = info->monspecs.dclkmax; |
| 1248 | } |
| 1249 | |
| 1250 | if (!var->pixclock) |
| 1251 | return -EINVAL; |
| 1252 | pixclock = PICOS2KHZ(var->pixclock) * 1000; |
| 1253 | |
| 1254 | htotal = var->xres + var->right_margin + var->hsync_len + |
| 1255 | var->left_margin; |
| 1256 | vtotal = var->yres + var->lower_margin + var->vsync_len + |
| 1257 | var->upper_margin; |
| 1258 | |
| 1259 | if (var->vmode & FB_VMODE_INTERLACED) |
| 1260 | vtotal /= 2; |
| 1261 | if (var->vmode & FB_VMODE_DOUBLE) |
| 1262 | vtotal *= 2; |
| 1263 | |
| 1264 | hfreq = pixclock/htotal; |
Jon Smirl | 0a793b7 | 2005-07-27 11:46:03 -0700 | [diff] [blame] | 1265 | hfreq = (hfreq + 500) / 1000 * 1000; |
| 1266 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | vfreq = hfreq/vtotal; |
| 1268 | |
| 1269 | return (vfreq < vfmin || vfreq > vfmax || |
| 1270 | hfreq < hfmin || hfreq > hfmax || |
| 1271 | pixclock < dclkmin || pixclock > dclkmax) ? |
| 1272 | -EINVAL : 0; |
| 1273 | } |
| 1274 | |
Antonino A. Daplas | 5e518d7 | 2005-09-09 13:04:34 -0700 | [diff] [blame] | 1275 | #if defined(__i386__) |
| 1276 | #include <linux/pci.h> |
| 1277 | |
| 1278 | /* |
| 1279 | * We need to ensure that the EDID block is only returned for |
| 1280 | * the primary graphics adapter. |
| 1281 | */ |
| 1282 | |
| 1283 | const unsigned char *fb_firmware_edid(struct device *device) |
| 1284 | { |
| 1285 | struct pci_dev *dev = NULL; |
| 1286 | struct resource *res = NULL; |
| 1287 | unsigned char *edid = NULL; |
| 1288 | |
| 1289 | if (device) |
| 1290 | dev = to_pci_dev(device); |
| 1291 | |
| 1292 | if (dev) |
| 1293 | res = &dev->resource[PCI_ROM_RESOURCE]; |
| 1294 | |
| 1295 | if (res && res->flags & IORESOURCE_ROM_SHADOW) |
| 1296 | edid = edid_info.dummy; |
| 1297 | |
| 1298 | return edid; |
| 1299 | } |
| 1300 | #else |
| 1301 | const unsigned char *fb_firmware_edid(struct device *device) |
| 1302 | { |
| 1303 | return NULL; |
| 1304 | } |
| 1305 | #endif /* _i386_ */ |
| 1306 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | EXPORT_SYMBOL(fb_parse_edid); |
| 1308 | EXPORT_SYMBOL(fb_edid_to_monspecs); |
Antonino A. Daplas | 5e518d7 | 2005-09-09 13:04:34 -0700 | [diff] [blame] | 1309 | EXPORT_SYMBOL(fb_firmware_edid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1310 | EXPORT_SYMBOL(fb_get_mode); |
| 1311 | EXPORT_SYMBOL(fb_validate_mode); |
| 1312 | EXPORT_SYMBOL(fb_destroy_modedb); |