drivers/video/videomodes.c

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