drivers/video/videomodes.c

   1 /*
   2  * (C) Copyright 2004
   3  * Pierre Aubert, Staubli Faverges , <p.aubert@staubli.com>
   4  * Copyright 2011 Freescale Semiconductor, Inc.
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 /************************************************************************
  10   Get Parameters for the video mode:
  11   The default video mode can be defined in CONFIG_SYS_DEFAULT_VIDEO_MODE.
  12   If undefined, default video mode is set to 0x301
  13   Parameters can be set via the variable "videomode" in the environment.
  14   2 diferent ways are possible:
  15   "videomode=301"   - 301 is a hexadecimal number describing the VESA
  16                       mode. Following modes are implemented:
  17
  18                       Colors    640x480 800x600 1024x768 1152x864 1280x1024
  19                      --------+---------------------------------------------
  20                       8 bits |  0x301   0x303    0x305    0x161     0x307
  21                      15 bits |  0x310   0x313    0x316    0x162     0x319
  22                      16 bits |  0x311   0x314    0x317    0x163     0x31A
  23                      24 bits |  0x312   0x315    0x318      ?       0x31B
  24                      --------+---------------------------------------------
  25   "videomode=bootargs"
  26                    - the parameters are parsed from the bootargs.
  27                       The format is "NAME:VALUE,NAME:VALUE" etc.
  28                       Ex.:
  29                       "bootargs=video=ctfb:x:800,y:600,depth:16,pclk:25000"
  30                       Parameters not included in the list will be taken from
  31                       the default mode, which is one of the following:
  32                       mode:0  640x480x24
  33                       mode:1  800x600x16
  34                       mode:2  1024x768x8
  35                       mode:3  960x720x24
  36                       mode:4  1152x864x16
  37                       mode:5  1280x1024x8
  38
  39                       if "mode" is not provided within the parameter list,
  40                       mode:0 is assumed.
  41                       Following parameters are supported:
  42                       x       xres = visible resolution horizontal
  43                       y       yres = visible resolution vertical
  44                       pclk    pixelclocks in pico sec
  45                       le      left_marging time from sync to picture in pixelclocks
  46                       ri      right_marging time from picture to sync in pixelclocks
  47                       up      upper_margin time from sync to picture
  48                       lo      lower_margin
  49                       hs      hsync_len length of horizontal sync
  50                       vs      vsync_len length of vertical sync
  51                       sync    see FB_SYNC_*
  52                       vmode   see FB_VMODE_*
  53                       depth   Color depth in bits per pixel
  54                       All other parameters in the variable bootargs are ignored.
  55                       It is also possible to set the parameters direct in the
  56                       variable "videomode", or in another variable i.e.
  57                       "myvideo" and setting the variable "videomode=myvideo"..
  58 ****************************************************************************/
  59
  60 #include <common.h>
  61 #include <edid.h>
  62 #include <errno.h>
  63 #include <linux/ctype.h>
  64
  65 #include "videomodes.h"
  66
  67 const struct ctfb_vesa_modes vesa_modes[VESA_MODES_COUNT] = {
  68         {0x301, RES_MODE_640x480, 8},
  69         {0x310, RES_MODE_640x480, 15},
  70         {0x311, RES_MODE_640x480, 16},
  71         {0x312, RES_MODE_640x480, 24},
  72         {0x303, RES_MODE_800x600, 8},
  73         {0x313, RES_MODE_800x600, 15},
  74         {0x314, RES_MODE_800x600, 16},
  75         {0x315, RES_MODE_800x600, 24},
  76         {0x305, RES_MODE_1024x768, 8},
  77         {0x316, RES_MODE_1024x768, 15},
  78         {0x317, RES_MODE_1024x768, 16},
  79         {0x318, RES_MODE_1024x768, 24},
  80         {0x161, RES_MODE_1152x864, 8},
  81         {0x162, RES_MODE_1152x864, 15},
  82         {0x163, RES_MODE_1152x864, 16},
  83         {0x307, RES_MODE_1280x1024, 8},
  84         {0x319, RES_MODE_1280x1024, 15},
  85         {0x31A, RES_MODE_1280x1024, 16},
  86         {0x31B, RES_MODE_1280x1024, 24},
  87 };
  88 const struct ctfb_res_modes res_mode_init[RES_MODES_COUNT] = {
  89         /*  x     y  hz  pixclk ps/kHz   le   ri  up  lo   hs vs  s  vmode */
  90 #ifndef CONFIG_VIDEO_STD_TIMINGS
  91         { 640,  480, 60, 39721,  25180,  40,  24, 32, 11,  96, 2, 0, FB_VMODE_NONINTERLACED},
  92         { 800,  600, 60, 27778,  36000,  64,  24, 22,  1,  72, 2, 0, FB_VMODE_NONINTERLACED},
  93         {1024,  768, 60, 15384,  65000, 168,   8, 29,  3, 144, 4, 0, FB_VMODE_NONINTERLACED},
  94         { 960,  720, 80, 13100,  76335, 160,  40, 32,  8,  80, 4, 0, FB_VMODE_NONINTERLACED},
  95         {1152,  864, 60, 12004,  83300, 200,  64, 32, 16,  80, 4, 0, FB_VMODE_NONINTERLACED},
  96         {1280, 1024, 60,  9090, 110000, 200,  48, 26,  1, 184, 3, 0, FB_VMODE_NONINTERLACED},
  97 #else
  98         { 640,  480, 60, 39683,  25200,  48,  16, 33, 10,  96, 2, 0, FB_VMODE_NONINTERLACED},
  99         { 800,  600, 60, 25000,  40000,  88,  40, 23,  1, 128, 4, FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED},
 100         {1024,  768, 60, 15384,  65000, 160,  24, 29,  3, 136, 6, 0, FB_VMODE_NONINTERLACED},
 101         { 960,  720, 75, 13468,  74250, 176,  72, 27,  1, 112, 2, 0, FB_VMODE_NONINTERLACED},
 102         {1152,  864, 75,  9259, 108000, 256,  64, 32,  1, 128, 3, FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED},
 103         {1280, 1024, 60,  9259, 108000, 248,  48, 38,  1, 112, 3, FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED},
 104 #endif
 105         {1280,  720, 60, 13468,  74250, 220, 110, 20,  5,  40, 5, FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED},
 106         {1360,  768, 60, 11696,  85500, 256,  64, 17,  3, 112, 7, 0, FB_VMODE_NONINTERLACED},
 107         {1920, 1080, 60,  6734, 148500, 148,  88, 36,  4,  44, 5, FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED},
 108         {1920, 1200, 60,  6494, 154000,  80,  48, 26,  3,  32, 6, FB_SYNC_HOR_HIGH_ACT, FB_VMODE_NONINTERLACED},
 109 };
 110
 111 /************************************************************************
 112  * Get Parameters for the video mode:
 113  */
 114 /*********************************************************************
 115  * returns the length to the next seperator
 116  */
 117 static int
 118 video_get_param_len(const char *start, char sep)
 119 {
 120         int i = 0;
 121         while ((*start != 0) && (*start != sep)) {
 122                 start++;
 123                 i++;
 124         }
 125         return i;
 126 }
 127
 128 static int
 129 video_search_param (char *start, char *param)
 130 {
 131         int len, totallen, i;
 132         char *p = start;
 133         len = strlen (param);
 134         totallen = len + strlen (start);
 135         for (i = 0; i < totallen; i++) {
 136                 if (strncmp (p++, param, len) == 0)
 137                         return (i);
 138         }
 139         return -1;
 140 }
 141
 142 /***************************************************************
 143  * Get parameter via the environment as it is done for the
 144  * linux kernel i.e:
 145  * video=ctfb:x:800,xv:1280,y:600,yv:1024,depth:16,mode:0,pclk:25000,
 146  *       le:56,ri:48,up:26,lo:5,hs:152,vs:2,sync:0,vmode:0,accel:0
 147  *
 148  * penv is a pointer to the environment, containing the string, or the name of
 149  * another environment variable. It could even be the term "bootargs"
 150  */
 151
 152 #define GET_OPTION(name,var)                            \
 153         if(strncmp(p,name,strlen(name))==0) {           \
 154                 val_s=p+strlen(name);                   \
 155                 var=simple_strtoul(val_s, NULL, 10);    \
 156         }
 157
 158 int video_get_params (struct ctfb_res_modes *pPar, char *penv)
 159 {
 160         char *p, *s, *val_s;
 161         int i = 0;
 162         int bpp;
 163         int mode;
 164
 165         /* first search for the environment containing the real param string */
 166         s = penv;
 167
 168         p = env_get(s);
 169         if (p)
 170                 s = p;
 171
 172         /*
 173          * in case of the bootargs line, we have to start
 174          * after "video=ctfb:"
 175          */
 176         i = video_search_param (s, "video=ctfb:");
 177         if (i >= 0) {
 178                 s += i;
 179                 s += strlen ("video=ctfb:");
 180         }
 181         /* search for mode as a default value */
 182         p = s;
 183         mode = 0;               /* default */
 184
 185         while ((i = video_get_param_len (p, ',')) != 0) {
 186                 GET_OPTION ("mode:", mode)
 187                         p += i;
 188                 if (*p != 0)
 189                         p++;    /* skip ',' */
 190         }
 191
 192         if (mode >= RES_MODES_COUNT)
 193                 mode = 0;
 194
 195         *pPar = res_mode_init[mode];    /* copy default values */
 196         bpp = 24 - ((mode % 3) * 8);
 197         p = s;                  /* restart */
 198
 199         while ((i = video_get_param_len (p, ',')) != 0) {
 200                 GET_OPTION ("x:", pPar->xres)
 201                         GET_OPTION ("y:", pPar->yres)
 202                         GET_OPTION ("refresh:", pPar->refresh)
 203                         GET_OPTION ("le:", pPar->left_margin)
 204                         GET_OPTION ("ri:", pPar->right_margin)
 205                         GET_OPTION ("up:", pPar->upper_margin)
 206                         GET_OPTION ("lo:", pPar->lower_margin)
 207                         GET_OPTION ("hs:", pPar->hsync_len)
 208                         GET_OPTION ("vs:", pPar->vsync_len)
 209                         GET_OPTION ("sync:", pPar->sync)
 210                         GET_OPTION ("vmode:", pPar->vmode)
 211                         GET_OPTION ("pclk:", pPar->pixclock)
 212                         GET_OPTION ("pclk_khz:", pPar->pixclock_khz)
 213                         GET_OPTION ("depth:", bpp)
 214                         p += i;
 215                 if (*p != 0)
 216                         p++;    /* skip ',' */
 217         }
 218         return bpp;
 219 }
 220
 221 /*
 222  * Parse the 'video-mode' environment variable
 223  *
 224  * Example: "video-mode=fslfb:1280x1024-32@60,monitor=dvi".  See
 225  * doc/README.video for more information on how to set the variable.
 226  *
 227  * @xres: returned value of X-resolution
 228  * @yres: returned value of Y-resolution
 229  * @depth: returned value of color depth
 230  * @freq: returned value of monitor frequency
 231  * @options: pointer to any remaining options, or NULL
 232  *
 233  * Returns 1 if valid values were found, 0 otherwise
 234  */
 235 int video_get_video_mode(unsigned int *xres, unsigned int *yres,
 236         unsigned int *depth, unsigned int *freq, const char **options)
 237 {
 238         char *p = env_get("video-mode");
 239         if (!p)
 240                 return 0;
 241
 242         /* Skip over the driver name, which we don't care about. */
 243         p = strchr(p, ':');
 244         if (!p)
 245                 return 0;
 246
 247         /* Get the X-resolution*/
 248         while (*p && !isdigit(*p))
 249                 p++;
 250         *xres = simple_strtoul(p, &p, 10);
 251         if (!*xres)
 252                 return 0;
 253
 254         /* Get the Y-resolution */
 255         while (*p && !isdigit(*p))
 256                 p++;
 257         *yres = simple_strtoul(p, &p, 10);
 258         if (!*yres)
 259                 return 0;
 260
 261         /* Get the depth */
 262         while (*p && !isdigit(*p))
 263                 p++;
 264         *depth = simple_strtoul(p, &p, 10);
 265         if (!*depth)
 266                 return 0;
 267
 268         /* Get the frequency */
 269         while (*p && !isdigit(*p))
 270                 p++;
 271         *freq = simple_strtoul(p, &p, 10);
 272         if (!*freq)
 273                 return 0;
 274
 275         /* Find the extra options, if any */
 276         p = strchr(p, ',');
 277         *options = p ? p + 1 : NULL;
 278
 279         return 1;
 280 }
 281
 282 /*
 283  * Parse the 'video-mode' environment variable using video_get_video_mode()
 284  * and lookup the matching ctfb_res_modes in res_mode_init.
 285  *
 286  * @default_mode: RES_MODE_##x## define for the mode to store in mode_ret
 287  *   when 'video-mode' is not set or does not contain a valid mode
 288  * @default_depth: depth to set when 'video-mode' is not set
 289  * @mode_ret: pointer where the mode will be stored
 290  * @depth_ret: pointer where the depth will be stored
 291  * @options: pointer to any remaining options, or NULL
 292  */
 293 void video_get_ctfb_res_modes(int default_mode, unsigned int default_depth,
 294                               const struct ctfb_res_modes **mode_ret,
 295                               unsigned int *depth_ret,
 296                               const char **options)
 297 {
 298         unsigned int i, xres, yres, depth, refresh;
 299
 300         *mode_ret = &res_mode_init[default_mode];
 301         *depth_ret = default_depth;
 302         *options = NULL;
 303
 304         if (!video_get_video_mode(&xres, &yres, &depth, &refresh, options))
 305                 return;
 306
 307         for (i = 0; i < RES_MODES_COUNT; i++) {
 308                 if (res_mode_init[i].xres == xres &&
 309                     res_mode_init[i].yres == yres &&
 310                     res_mode_init[i].refresh == refresh) {
 311                         *mode_ret = &res_mode_init[i];
 312                         *depth_ret = depth;
 313                         return;
 314                 }
 315         }
 316
 317         printf("video-mode %dx%d-%d@%d not available, falling back to %dx%d-%d@%d\n",
 318                xres, yres, depth, refresh, (*mode_ret)->xres,
 319                (*mode_ret)->yres, *depth_ret, (*mode_ret)->refresh);
 320 }
 321
 322 /*
 323  * Find the named string option within the ',' separated options string, and
 324  * store its value in dest.
 325  *
 326  * @options: ',' separated options string
 327  * @name: name of the option to look for
 328  * @dest: destination buffer to store the value of the option in
 329  * @dest_len: length of dest
 330  * @def: value to store in dest if the option is not present in options
 331  */
 332 void video_get_option_string(const char *options, const char *name,
 333                              char *dest, int dest_len, const char *def)
 334 {
 335         const char *p = options;
 336         const int name_len = strlen(name);
 337         int i, len;
 338
 339         while (p && (i = video_get_param_len(p, ',')) != 0) {
 340                 if (strncmp(p, name, name_len) == 0 && p[name_len] == '=') {
 341                         len = i - (name_len + 1);
 342                         if (len >= dest_len)
 343                                 len = dest_len - 1;
 344                         memcpy(dest, &p[name_len + 1], len);
 345                         dest[len] = 0;
 346                         return;
 347                 }
 348                 p += i;
 349                 if (*p != 0)
 350                         p++;    /* skip ',' */
 351         }
 352         strcpy(dest, def);
 353 }
 354
 355 /*
 356  * Find the named integer option within the ',' separated options string, and
 357  * return its value.
 358  *
 359  * @options: ',' separated options string
 360  * @name: name of the option to look for
 361  * @def: value to return if the option is not present in options
 362  */
 363 int video_get_option_int(const char *options, const char *name, int def)
 364 {
 365         const char *p = options;
 366         const int name_len = strlen(name);
 367         int i;
 368
 369         while (p && (i = video_get_param_len(p, ',')) != 0) {
 370                 if (strncmp(p, name, name_len) == 0 && p[name_len] == '=')
 371                         return simple_strtoul(&p[name_len + 1], NULL, 10);
 372
 373                 p += i;
 374                 if (*p != 0)
 375                         p++;    /* skip ',' */
 376         }
 377         return def;
 378 }
 379
 380 /**
 381  * Convert an EDID detailed timing to a struct ctfb_res_modes
 382  *
 383  * @param t             The EDID detailed timing to be converted
 384  * @param mode          Returns the converted timing
 385  *
 386  * @return 0 on success, or a negative errno on error
 387  */
 388 int video_edid_dtd_to_ctfb_res_modes(struct edid_detailed_timing *t,
 389                                      struct ctfb_res_modes *mode)
 390 {
 391         int margin, h_total, v_total;
 392
 393         /* Check all timings are non 0 */
 394         if (EDID_DETAILED_TIMING_PIXEL_CLOCK(*t) == 0 ||
 395             EDID_DETAILED_TIMING_HORIZONTAL_ACTIVE(*t) == 0 ||
 396             EDID_DETAILED_TIMING_HORIZONTAL_BLANKING(*t) == 0 ||
 397             EDID_DETAILED_TIMING_VERTICAL_ACTIVE(*t) == 0 ||
 398             EDID_DETAILED_TIMING_VERTICAL_BLANKING(*t) == 0 ||
 399             EDID_DETAILED_TIMING_HSYNC_OFFSET(*t) == 0 ||
 400             EDID_DETAILED_TIMING_HSYNC_PULSE_WIDTH(*t) == 0 ||
 401             EDID_DETAILED_TIMING_VSYNC_OFFSET(*t) == 0 ||
 402             EDID_DETAILED_TIMING_VSYNC_PULSE_WIDTH(*t) == 0 ||
 403             /* 3d formats are not supported*/
 404             EDID_DETAILED_TIMING_FLAG_STEREO(*t) != 0)
 405                 return -EINVAL;
 406
 407         mode->xres = EDID_DETAILED_TIMING_HORIZONTAL_ACTIVE(*t);
 408         mode->yres = EDID_DETAILED_TIMING_VERTICAL_ACTIVE(*t);
 409
 410         h_total = mode->xres + EDID_DETAILED_TIMING_HORIZONTAL_BLANKING(*t);
 411         v_total = mode->yres + EDID_DETAILED_TIMING_VERTICAL_BLANKING(*t);
 412         mode->refresh = EDID_DETAILED_TIMING_PIXEL_CLOCK(*t) /
 413                         (h_total * v_total);
 414
 415         mode->pixclock_khz = EDID_DETAILED_TIMING_PIXEL_CLOCK(*t) / 1000;
 416         mode->pixclock = 1000000000L / mode->pixclock_khz;
 417
 418         mode->right_margin = EDID_DETAILED_TIMING_HSYNC_OFFSET(*t);
 419         mode->hsync_len = EDID_DETAILED_TIMING_HSYNC_PULSE_WIDTH(*t);
 420         margin = EDID_DETAILED_TIMING_HORIZONTAL_BLANKING(*t) -
 421                         (mode->right_margin + mode->hsync_len);
 422         if (margin <= 0)
 423                 return -EINVAL;
 424
 425         mode->left_margin = margin;
 426
 427         mode->lower_margin = EDID_DETAILED_TIMING_VSYNC_OFFSET(*t);
 428         mode->vsync_len = EDID_DETAILED_TIMING_VSYNC_PULSE_WIDTH(*t);
 429         margin = EDID_DETAILED_TIMING_VERTICAL_BLANKING(*t) -
 430                         (mode->lower_margin + mode->vsync_len);
 431         if (margin <= 0)
 432                 return -EINVAL;
 433
 434         mode->upper_margin = margin;
 435
 436         mode->sync = 0;
 437         if (EDID_DETAILED_TIMING_FLAG_HSYNC_POLARITY(*t))
 438                 mode->sync |= FB_SYNC_HOR_HIGH_ACT;
 439         if (EDID_DETAILED_TIMING_FLAG_VSYNC_POLARITY(*t))
 440                 mode->sync |= FB_SYNC_VERT_HIGH_ACT;
 441
 442         if (EDID_DETAILED_TIMING_FLAG_INTERLACED(*t))
 443                 mode->vmode = FB_VMODE_INTERLACED;
 444         else
 445                 mode->vmode = FB_VMODE_NONINTERLACED;
 446
 447         return 0;
 448 }