drivers/media/v4l2-core/v4l2-dv-timings.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * v4l2-dv-timings - dv-timings helper functions
   4  *
   5  * Copyright 2013 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/types.h>
  10 #include <linux/kernel.h>
  11 #include <linux/errno.h>
  12 #include <linux/rational.h>
  13 #include <linux/videodev2.h>
  14 #include <linux/v4l2-dv-timings.h>
  15 #include <media/v4l2-dv-timings.h>
  16 #include <linux/math64.h>
  17 #include <linux/hdmi.h>
  18 #include <media/cec.h>
  19
  20 MODULE_AUTHOR("Hans Verkuil");
  21 MODULE_DESCRIPTION("V4L2 DV Timings Helper Functions");
  22 MODULE_LICENSE("GPL");
  23
  24 const struct v4l2_dv_timings v4l2_dv_timings_presets[] = {
  25         V4L2_DV_BT_CEA_640X480P59_94,
  26         V4L2_DV_BT_CEA_720X480I59_94,
  27         V4L2_DV_BT_CEA_720X480P59_94,
  28         V4L2_DV_BT_CEA_720X576I50,
  29         V4L2_DV_BT_CEA_720X576P50,
  30         V4L2_DV_BT_CEA_1280X720P24,
  31         V4L2_DV_BT_CEA_1280X720P25,
  32         V4L2_DV_BT_CEA_1280X720P30,
  33         V4L2_DV_BT_CEA_1280X720P50,
  34         V4L2_DV_BT_CEA_1280X720P60,
  35         V4L2_DV_BT_CEA_1920X1080P24,
  36         V4L2_DV_BT_CEA_1920X1080P25,
  37         V4L2_DV_BT_CEA_1920X1080P30,
  38         V4L2_DV_BT_CEA_1920X1080I50,
  39         V4L2_DV_BT_CEA_1920X1080P50,
  40         V4L2_DV_BT_CEA_1920X1080I60,
  41         V4L2_DV_BT_CEA_1920X1080P60,
  42         V4L2_DV_BT_DMT_640X350P85,
  43         V4L2_DV_BT_DMT_640X400P85,
  44         V4L2_DV_BT_DMT_720X400P85,
  45         V4L2_DV_BT_DMT_640X480P72,
  46         V4L2_DV_BT_DMT_640X480P75,
  47         V4L2_DV_BT_DMT_640X480P85,
  48         V4L2_DV_BT_DMT_800X600P56,
  49         V4L2_DV_BT_DMT_800X600P60,
  50         V4L2_DV_BT_DMT_800X600P72,
  51         V4L2_DV_BT_DMT_800X600P75,
  52         V4L2_DV_BT_DMT_800X600P85,
  53         V4L2_DV_BT_DMT_800X600P120_RB,
  54         V4L2_DV_BT_DMT_848X480P60,
  55         V4L2_DV_BT_DMT_1024X768I43,
  56         V4L2_DV_BT_DMT_1024X768P60,
  57         V4L2_DV_BT_DMT_1024X768P70,
  58         V4L2_DV_BT_DMT_1024X768P75,
  59         V4L2_DV_BT_DMT_1024X768P85,
  60         V4L2_DV_BT_DMT_1024X768P120_RB,
  61         V4L2_DV_BT_DMT_1152X864P75,
  62         V4L2_DV_BT_DMT_1280X768P60_RB,
  63         V4L2_DV_BT_DMT_1280X768P60,
  64         V4L2_DV_BT_DMT_1280X768P75,
  65         V4L2_DV_BT_DMT_1280X768P85,
  66         V4L2_DV_BT_DMT_1280X768P120_RB,
  67         V4L2_DV_BT_DMT_1280X800P60_RB,
  68         V4L2_DV_BT_DMT_1280X800P60,
  69         V4L2_DV_BT_DMT_1280X800P75,
  70         V4L2_DV_BT_DMT_1280X800P85,
  71         V4L2_DV_BT_DMT_1280X800P120_RB,
  72         V4L2_DV_BT_DMT_1280X960P60,
  73         V4L2_DV_BT_DMT_1280X960P85,
  74         V4L2_DV_BT_DMT_1280X960P120_RB,
  75         V4L2_DV_BT_DMT_1280X1024P60,
  76         V4L2_DV_BT_DMT_1280X1024P75,
  77         V4L2_DV_BT_DMT_1280X1024P85,
  78         V4L2_DV_BT_DMT_1280X1024P120_RB,
  79         V4L2_DV_BT_DMT_1360X768P60,
  80         V4L2_DV_BT_DMT_1360X768P120_RB,
  81         V4L2_DV_BT_DMT_1366X768P60,
  82         V4L2_DV_BT_DMT_1366X768P60_RB,
  83         V4L2_DV_BT_DMT_1400X1050P60_RB,
  84         V4L2_DV_BT_DMT_1400X1050P60,
  85         V4L2_DV_BT_DMT_1400X1050P75,
  86         V4L2_DV_BT_DMT_1400X1050P85,
  87         V4L2_DV_BT_DMT_1400X1050P120_RB,
  88         V4L2_DV_BT_DMT_1440X900P60_RB,
  89         V4L2_DV_BT_DMT_1440X900P60,
  90         V4L2_DV_BT_DMT_1440X900P75,
  91         V4L2_DV_BT_DMT_1440X900P85,
  92         V4L2_DV_BT_DMT_1440X900P120_RB,
  93         V4L2_DV_BT_DMT_1600X900P60_RB,
  94         V4L2_DV_BT_DMT_1600X1200P60,
  95         V4L2_DV_BT_DMT_1600X1200P65,
  96         V4L2_DV_BT_DMT_1600X1200P70,
  97         V4L2_DV_BT_DMT_1600X1200P75,
  98         V4L2_DV_BT_DMT_1600X1200P85,
  99         V4L2_DV_BT_DMT_1600X1200P120_RB,
 100         V4L2_DV_BT_DMT_1680X1050P60_RB,
 101         V4L2_DV_BT_DMT_1680X1050P60,
 102         V4L2_DV_BT_DMT_1680X1050P75,
 103         V4L2_DV_BT_DMT_1680X1050P85,
 104         V4L2_DV_BT_DMT_1680X1050P120_RB,
 105         V4L2_DV_BT_DMT_1792X1344P60,
 106         V4L2_DV_BT_DMT_1792X1344P75,
 107         V4L2_DV_BT_DMT_1792X1344P120_RB,
 108         V4L2_DV_BT_DMT_1856X1392P60,
 109         V4L2_DV_BT_DMT_1856X1392P75,
 110         V4L2_DV_BT_DMT_1856X1392P120_RB,
 111         V4L2_DV_BT_DMT_1920X1200P60_RB,
 112         V4L2_DV_BT_DMT_1920X1200P60,
 113         V4L2_DV_BT_DMT_1920X1200P75,
 114         V4L2_DV_BT_DMT_1920X1200P85,
 115         V4L2_DV_BT_DMT_1920X1200P120_RB,
 116         V4L2_DV_BT_DMT_1920X1440P60,
 117         V4L2_DV_BT_DMT_1920X1440P75,
 118         V4L2_DV_BT_DMT_1920X1440P120_RB,
 119         V4L2_DV_BT_DMT_2048X1152P60_RB,
 120         V4L2_DV_BT_DMT_2560X1600P60_RB,
 121         V4L2_DV_BT_DMT_2560X1600P60,
 122         V4L2_DV_BT_DMT_2560X1600P75,
 123         V4L2_DV_BT_DMT_2560X1600P85,
 124         V4L2_DV_BT_DMT_2560X1600P120_RB,
 125         V4L2_DV_BT_CEA_3840X2160P24,
 126         V4L2_DV_BT_CEA_3840X2160P25,
 127         V4L2_DV_BT_CEA_3840X2160P30,
 128         V4L2_DV_BT_CEA_3840X2160P50,
 129         V4L2_DV_BT_CEA_3840X2160P60,
 130         V4L2_DV_BT_CEA_4096X2160P24,
 131         V4L2_DV_BT_CEA_4096X2160P25,
 132         V4L2_DV_BT_CEA_4096X2160P30,
 133         V4L2_DV_BT_CEA_4096X2160P50,
 134         V4L2_DV_BT_DMT_4096X2160P59_94_RB,
 135         V4L2_DV_BT_CEA_4096X2160P60,
 136         { }
 137 };
 138 EXPORT_SYMBOL_GPL(v4l2_dv_timings_presets);
 139
 140 bool v4l2_valid_dv_timings(const struct v4l2_dv_timings *t,
 141                            const struct v4l2_dv_timings_cap *dvcap,
 142                            v4l2_check_dv_timings_fnc fnc,
 143                            void *fnc_handle)
 144 {
 145         const struct v4l2_bt_timings *bt = &t->bt;
 146         const struct v4l2_bt_timings_cap *cap = &dvcap->bt;
 147         u32 caps = cap->capabilities;
 148         const u32 max_vert = 10240;
 149         u32 max_hor = 3 * bt->width;
 150
 151         if (t->type != V4L2_DV_BT_656_1120)
 152                 return false;
 153         if (t->type != dvcap->type ||
 154             bt->height < cap->min_height ||
 155             bt->height > cap->max_height ||
 156             bt->width < cap->min_width ||
 157             bt->width > cap->max_width ||
 158             bt->pixelclock < cap->min_pixelclock ||
 159             bt->pixelclock > cap->max_pixelclock ||
 160             (!(caps & V4L2_DV_BT_CAP_CUSTOM) &&
 161              cap->standards && bt->standards &&
 162              !(bt->standards & cap->standards)) ||
 163             (bt->interlaced && !(caps & V4L2_DV_BT_CAP_INTERLACED)) ||
 164             (!bt->interlaced && !(caps & V4L2_DV_BT_CAP_PROGRESSIVE)))
 165                 return false;
 166
 167         /* sanity checks for the blanking timings */
 168         if (!bt->interlaced &&
 169             (bt->il_vbackporch || bt->il_vsync || bt->il_vfrontporch))
 170                 return false;
 171         /*
 172          * Some video receivers cannot properly separate the frontporch,
 173          * backporch and sync values, and instead they only have the total
 174          * blanking. That can be assigned to any of these three fields.
 175          * So just check that none of these are way out of range.
 176          */
 177         if (bt->hfrontporch > max_hor ||
 178             bt->hsync > max_hor || bt->hbackporch > max_hor)
 179                 return false;
 180         if (bt->vfrontporch > max_vert ||
 181             bt->vsync > max_vert || bt->vbackporch > max_vert)
 182                 return false;
 183         if (bt->interlaced && (bt->il_vfrontporch > max_vert ||
 184             bt->il_vsync > max_vert || bt->il_vbackporch > max_vert))
 185                 return false;
 186         return fnc == NULL || fnc(t, fnc_handle);
 187 }
 188 EXPORT_SYMBOL_GPL(v4l2_valid_dv_timings);
 189
 190 int v4l2_enum_dv_timings_cap(struct v4l2_enum_dv_timings *t,
 191                              const struct v4l2_dv_timings_cap *cap,
 192                              v4l2_check_dv_timings_fnc fnc,
 193                              void *fnc_handle)
 194 {
 195         u32 i, idx;
 196
 197         memset(t->reserved, 0, sizeof(t->reserved));
 198         for (i = idx = 0; v4l2_dv_timings_presets[i].bt.width; i++) {
 199                 if (v4l2_valid_dv_timings(v4l2_dv_timings_presets + i, cap,
 200                                           fnc, fnc_handle) &&
 201                     idx++ == t->index) {
 202                         t->timings = v4l2_dv_timings_presets[i];
 203                         return 0;
 204                 }
 205         }
 206         return -EINVAL;
 207 }
 208 EXPORT_SYMBOL_GPL(v4l2_enum_dv_timings_cap);
 209
 210 bool v4l2_find_dv_timings_cap(struct v4l2_dv_timings *t,
 211                               const struct v4l2_dv_timings_cap *cap,
 212                               unsigned pclock_delta,
 213                               v4l2_check_dv_timings_fnc fnc,
 214                               void *fnc_handle)
 215 {
 216         int i;
 217
 218         if (!v4l2_valid_dv_timings(t, cap, fnc, fnc_handle))
 219                 return false;
 220
 221         for (i = 0; v4l2_dv_timings_presets[i].bt.width; i++) {
 222                 if (v4l2_valid_dv_timings(v4l2_dv_timings_presets + i, cap,
 223                                           fnc, fnc_handle) &&
 224                     v4l2_match_dv_timings(t, v4l2_dv_timings_presets + i,
 225                                           pclock_delta, false)) {
 226                         u32 flags = t->bt.flags & V4L2_DV_FL_REDUCED_FPS;
 227
 228                         *t = v4l2_dv_timings_presets[i];
 229                         if (can_reduce_fps(&t->bt))
 230                                 t->bt.flags |= flags;
 231
 232                         return true;
 233                 }
 234         }
 235         return false;
 236 }
 237 EXPORT_SYMBOL_GPL(v4l2_find_dv_timings_cap);
 238
 239 bool v4l2_find_dv_timings_cea861_vic(struct v4l2_dv_timings *t, u8 vic)
 240 {
 241         unsigned int i;
 242
 243         for (i = 0; v4l2_dv_timings_presets[i].bt.width; i++) {
 244                 const struct v4l2_bt_timings *bt =
 245                         &v4l2_dv_timings_presets[i].bt;
 246
 247                 if ((bt->flags & V4L2_DV_FL_HAS_CEA861_VIC) &&
 248                     bt->cea861_vic == vic) {
 249                         *t = v4l2_dv_timings_presets[i];
 250                         return true;
 251                 }
 252         }
 253         return false;
 254 }
 255 EXPORT_SYMBOL_GPL(v4l2_find_dv_timings_cea861_vic);
 256
 257 /**
 258  * v4l2_match_dv_timings - check if two timings match
 259  * @t1: compare this v4l2_dv_timings struct...
 260  * @t2: with this struct.
 261  * @pclock_delta: the allowed pixelclock deviation.
 262  * @match_reduced_fps: if true, then fail if V4L2_DV_FL_REDUCED_FPS does not
 263  *      match.
 264  *
 265  * Compare t1 with t2 with a given margin of error for the pixelclock.
 266  */
 267 bool v4l2_match_dv_timings(const struct v4l2_dv_timings *t1,
 268                            const struct v4l2_dv_timings *t2,
 269                            unsigned pclock_delta, bool match_reduced_fps)
 270 {
 271         if (t1->type != t2->type || t1->type != V4L2_DV_BT_656_1120)
 272                 return false;
 273         if (t1->bt.width == t2->bt.width &&
 274             t1->bt.height == t2->bt.height &&
 275             t1->bt.interlaced == t2->bt.interlaced &&
 276             t1->bt.polarities == t2->bt.polarities &&
 277             t1->bt.pixelclock >= t2->bt.pixelclock - pclock_delta &&
 278             t1->bt.pixelclock <= t2->bt.pixelclock + pclock_delta &&
 279             t1->bt.hfrontporch == t2->bt.hfrontporch &&
 280             t1->bt.hsync == t2->bt.hsync &&
 281             t1->bt.hbackporch == t2->bt.hbackporch &&
 282             t1->bt.vfrontporch == t2->bt.vfrontporch &&
 283             t1->bt.vsync == t2->bt.vsync &&
 284             t1->bt.vbackporch == t2->bt.vbackporch &&
 285             (!match_reduced_fps ||
 286              (t1->bt.flags & V4L2_DV_FL_REDUCED_FPS) ==
 287                 (t2->bt.flags & V4L2_DV_FL_REDUCED_FPS)) &&
 288             (!t1->bt.interlaced ||
 289                 (t1->bt.il_vfrontporch == t2->bt.il_vfrontporch &&
 290                  t1->bt.il_vsync == t2->bt.il_vsync &&
 291                  t1->bt.il_vbackporch == t2->bt.il_vbackporch)))
 292                 return true;
 293         return false;
 294 }
 295 EXPORT_SYMBOL_GPL(v4l2_match_dv_timings);
 296
 297 void v4l2_print_dv_timings(const char *dev_prefix, const char *prefix,
 298                            const struct v4l2_dv_timings *t, bool detailed)
 299 {
 300         const struct v4l2_bt_timings *bt = &t->bt;
 301         u32 htot, vtot;
 302         u32 fps;
 303
 304         if (t->type != V4L2_DV_BT_656_1120)
 305                 return;
 306
 307         htot = V4L2_DV_BT_FRAME_WIDTH(bt);
 308         vtot = V4L2_DV_BT_FRAME_HEIGHT(bt);
 309         if (bt->interlaced)
 310                 vtot /= 2;
 311
 312         fps = (htot * vtot) > 0 ? div_u64((100 * (u64)bt->pixelclock),
 313                                   (htot * vtot)) : 0;
 314
 315         if (prefix == NULL)
 316                 prefix = "";
 317
 318         pr_info("%s: %s%ux%u%s%u.%u (%ux%u)\n", dev_prefix, prefix,
 319                 bt->width, bt->height, bt->interlaced ? "i" : "p",
 320                 fps / 100, fps % 100, htot, vtot);
 321
 322         if (!detailed)
 323                 return;
 324
 325         pr_info("%s: horizontal: fp = %u, %ssync = %u, bp = %u\n",
 326                         dev_prefix, bt->hfrontporch,
 327                         (bt->polarities & V4L2_DV_HSYNC_POS_POL) ? "+" : "-",
 328                         bt->hsync, bt->hbackporch);
 329         pr_info("%s: vertical: fp = %u, %ssync = %u, bp = %u\n",
 330                         dev_prefix, bt->vfrontporch,
 331                         (bt->polarities & V4L2_DV_VSYNC_POS_POL) ? "+" : "-",
 332                         bt->vsync, bt->vbackporch);
 333         if (bt->interlaced)
 334                 pr_info("%s: vertical bottom field: fp = %u, %ssync = %u, bp = %u\n",
 335                         dev_prefix, bt->il_vfrontporch,
 336                         (bt->polarities & V4L2_DV_VSYNC_POS_POL) ? "+" : "-",
 337                         bt->il_vsync, bt->il_vbackporch);
 338         pr_info("%s: pixelclock: %llu\n", dev_prefix, bt->pixelclock);
 339         pr_info("%s: flags (0x%x):%s%s%s%s%s%s%s%s%s%s\n",
 340                         dev_prefix, bt->flags,
 341                         (bt->flags & V4L2_DV_FL_REDUCED_BLANKING) ?
 342                         " REDUCED_BLANKING" : "",
 343                         ((bt->flags & V4L2_DV_FL_REDUCED_BLANKING) &&
 344                          bt->vsync == 8) ? " (V2)" : "",
 345                         (bt->flags & V4L2_DV_FL_CAN_REDUCE_FPS) ?
 346                         " CAN_REDUCE_FPS" : "",
 347                         (bt->flags & V4L2_DV_FL_REDUCED_FPS) ?
 348                         " REDUCED_FPS" : "",
 349                         (bt->flags & V4L2_DV_FL_HALF_LINE) ?
 350                         " HALF_LINE" : "",
 351                         (bt->flags & V4L2_DV_FL_IS_CE_VIDEO) ?
 352                         " CE_VIDEO" : "",
 353                         (bt->flags & V4L2_DV_FL_FIRST_FIELD_EXTRA_LINE) ?
 354                         " FIRST_FIELD_EXTRA_LINE" : "",
 355                         (bt->flags & V4L2_DV_FL_HAS_PICTURE_ASPECT) ?
 356                         " HAS_PICTURE_ASPECT" : "",
 357                         (bt->flags & V4L2_DV_FL_HAS_CEA861_VIC) ?
 358                         " HAS_CEA861_VIC" : "",
 359                         (bt->flags & V4L2_DV_FL_HAS_HDMI_VIC) ?
 360                         " HAS_HDMI_VIC" : "");
 361         pr_info("%s: standards (0x%x):%s%s%s%s%s\n", dev_prefix, bt->standards,
 362                         (bt->standards & V4L2_DV_BT_STD_CEA861) ?  " CEA" : "",
 363                         (bt->standards & V4L2_DV_BT_STD_DMT) ?  " DMT" : "",
 364                         (bt->standards & V4L2_DV_BT_STD_CVT) ?  " CVT" : "",
 365                         (bt->standards & V4L2_DV_BT_STD_GTF) ?  " GTF" : "",
 366                         (bt->standards & V4L2_DV_BT_STD_SDI) ?  " SDI" : "");
 367         if (bt->flags & V4L2_DV_FL_HAS_PICTURE_ASPECT)
 368                 pr_info("%s: picture aspect (hor:vert): %u:%u\n", dev_prefix,
 369                         bt->picture_aspect.numerator,
 370                         bt->picture_aspect.denominator);
 371         if (bt->flags & V4L2_DV_FL_HAS_CEA861_VIC)
 372                 pr_info("%s: CEA-861 VIC: %u\n", dev_prefix, bt->cea861_vic);
 373         if (bt->flags & V4L2_DV_FL_HAS_HDMI_VIC)
 374                 pr_info("%s: HDMI VIC: %u\n", dev_prefix, bt->hdmi_vic);
 375 }
 376 EXPORT_SYMBOL_GPL(v4l2_print_dv_timings);
 377
 378 struct v4l2_fract v4l2_dv_timings_aspect_ratio(const struct v4l2_dv_timings *t)
 379 {
 380         struct v4l2_fract ratio = { 1, 1 };
 381         unsigned long n, d;
 382
 383         if (t->type != V4L2_DV_BT_656_1120)
 384                 return ratio;
 385         if (!(t->bt.flags & V4L2_DV_FL_HAS_PICTURE_ASPECT))
 386                 return ratio;
 387
 388         ratio.numerator = t->bt.width * t->bt.picture_aspect.denominator;
 389         ratio.denominator = t->bt.height * t->bt.picture_aspect.numerator;
 390
 391         rational_best_approximation(ratio.numerator, ratio.denominator,
 392                                     ratio.numerator, ratio.denominator, &n, &d);
 393         ratio.numerator = n;
 394         ratio.denominator = d;
 395         return ratio;
 396 }
 397 EXPORT_SYMBOL_GPL(v4l2_dv_timings_aspect_ratio);
 398
 399 /*
 400  * CVT defines
 401  * Based on Coordinated Video Timings Standard
 402  * version 1.1 September 10, 2003
 403  */
 404
 405 #define CVT_PXL_CLK_GRAN        250000  /* pixel clock granularity */
 406 #define CVT_PXL_CLK_GRAN_RB_V2 1000     /* granularity for reduced blanking v2*/
 407
 408 /* Normal blanking */
 409 #define CVT_MIN_V_BPORCH        7       /* lines */
 410 #define CVT_MIN_V_PORCH_RND     3       /* lines */
 411 #define CVT_MIN_VSYNC_BP        550     /* min time of vsync + back porch (us) */
 412 #define CVT_HSYNC_PERCENT       8       /* nominal hsync as percentage of line */
 413
 414 /* Normal blanking for CVT uses GTF to calculate horizontal blanking */
 415 #define CVT_CELL_GRAN           8       /* character cell granularity */
 416 #define CVT_M                   600     /* blanking formula gradient */
 417 #define CVT_C                   40      /* blanking formula offset */
 418 #define CVT_K                   128     /* blanking formula scaling factor */
 419 #define CVT_J                   20      /* blanking formula scaling factor */
 420 #define CVT_C_PRIME (((CVT_C - CVT_J) * CVT_K / 256) + CVT_J)
 421 #define CVT_M_PRIME (CVT_K * CVT_M / 256)
 422
 423 /* Reduced Blanking */
 424 #define CVT_RB_MIN_V_BPORCH    7       /* lines  */
 425 #define CVT_RB_V_FPORCH        3       /* lines  */
 426 #define CVT_RB_MIN_V_BLANK   460       /* us     */
 427 #define CVT_RB_H_SYNC         32       /* pixels */
 428 #define CVT_RB_H_BLANK       160       /* pixels */
 429 /* Reduce blanking Version 2 */
 430 #define CVT_RB_V2_H_BLANK     80       /* pixels */
 431 #define CVT_RB_MIN_V_FPORCH    3       /* lines  */
 432 #define CVT_RB_V2_MIN_V_FPORCH 1       /* lines  */
 433 #define CVT_RB_V_BPORCH        6       /* lines  */
 434
 435 /** v4l2_detect_cvt - detect if the given timings follow the CVT standard
 436  * @frame_height - the total height of the frame (including blanking) in lines.
 437  * @hfreq - the horizontal frequency in Hz.
 438  * @vsync - the height of the vertical sync in lines.
 439  * @active_width - active width of image (does not include blanking). This
 440  * information is needed only in case of version 2 of reduced blanking.
 441  * In other cases, this parameter does not have any effect on timings.
 442  * @polarities - the horizontal and vertical polarities (same as struct
 443  *              v4l2_bt_timings polarities).
 444  * @interlaced - if this flag is true, it indicates interlaced format
 445  * @fmt - the resulting timings.
 446  *
 447  * This function will attempt to detect if the given values correspond to a
 448  * valid CVT format. If so, then it will return true, and fmt will be filled
 449  * in with the found CVT timings.
 450  */
 451 bool v4l2_detect_cvt(unsigned frame_height,
 452                      unsigned hfreq,
 453                      unsigned vsync,
 454                      unsigned active_width,
 455                      u32 polarities,
 456                      bool interlaced,
 457                      struct v4l2_dv_timings *fmt)
 458 {
 459         int  v_fp, v_bp, h_fp, h_bp, hsync;
 460         int  frame_width, image_height, image_width;
 461         bool reduced_blanking;
 462         bool rb_v2 = false;
 463         unsigned pix_clk;
 464
 465         if (vsync < 4 || vsync > 8)
 466                 return false;
 467
 468         if (polarities == V4L2_DV_VSYNC_POS_POL)
 469                 reduced_blanking = false;
 470         else if (polarities == V4L2_DV_HSYNC_POS_POL)
 471                 reduced_blanking = true;
 472         else
 473                 return false;
 474
 475         if (reduced_blanking && vsync == 8)
 476                 rb_v2 = true;
 477
 478         if (rb_v2 && active_width == 0)
 479                 return false;
 480
 481         if (!rb_v2 && vsync > 7)
 482                 return false;
 483
 484         if (hfreq == 0)
 485                 return false;
 486
 487         /* Vertical */
 488         if (reduced_blanking) {
 489                 if (rb_v2) {
 490                         v_bp = CVT_RB_V_BPORCH;
 491                         v_fp = (CVT_RB_MIN_V_BLANK * hfreq) / 1000000 + 1;
 492                         v_fp -= vsync + v_bp;
 493
 494                         if (v_fp < CVT_RB_V2_MIN_V_FPORCH)
 495                                 v_fp = CVT_RB_V2_MIN_V_FPORCH;
 496                 } else {
 497                         v_fp = CVT_RB_V_FPORCH;
 498                         v_bp = (CVT_RB_MIN_V_BLANK * hfreq) / 1000000 + 1;
 499                         v_bp -= vsync + v_fp;
 500
 501                         if (v_bp < CVT_RB_MIN_V_BPORCH)
 502                                 v_bp = CVT_RB_MIN_V_BPORCH;
 503                 }
 504         } else {
 505                 v_fp = CVT_MIN_V_PORCH_RND;
 506                 v_bp = (CVT_MIN_VSYNC_BP * hfreq) / 1000000 + 1 - vsync;
 507
 508                 if (v_bp < CVT_MIN_V_BPORCH)
 509                         v_bp = CVT_MIN_V_BPORCH;
 510         }
 511
 512         if (interlaced)
 513                 image_height = (frame_height - 2 * v_fp - 2 * vsync - 2 * v_bp) & ~0x1;
 514         else
 515                 image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
 516
 517         if (image_height < 0)
 518                 return false;
 519
 520         /* Aspect ratio based on vsync */
 521         switch (vsync) {
 522         case 4:
 523                 image_width = (image_height * 4) / 3;
 524                 break;
 525         case 5:
 526                 image_width = (image_height * 16) / 9;
 527                 break;
 528         case 6:
 529                 image_width = (image_height * 16) / 10;
 530                 break;
 531         case 7:
 532                 /* special case */
 533                 if (image_height == 1024)
 534                         image_width = (image_height * 5) / 4;
 535                 else if (image_height == 768)
 536                         image_width = (image_height * 15) / 9;
 537                 else
 538                         return false;
 539                 break;
 540         case 8:
 541                 image_width = active_width;
 542                 break;
 543         default:
 544                 return false;
 545         }
 546
 547         if (!rb_v2)
 548                 image_width = image_width & ~7;
 549
 550         /* Horizontal */
 551         if (reduced_blanking) {
 552                 int h_blank;
 553                 int clk_gran;
 554
 555                 h_blank = rb_v2 ? CVT_RB_V2_H_BLANK : CVT_RB_H_BLANK;
 556                 clk_gran = rb_v2 ? CVT_PXL_CLK_GRAN_RB_V2 : CVT_PXL_CLK_GRAN;
 557
 558                 pix_clk = (image_width + h_blank) * hfreq;
 559                 pix_clk = (pix_clk / clk_gran) * clk_gran;
 560
 561                 h_bp  = h_blank / 2;
 562                 hsync = CVT_RB_H_SYNC;
 563                 h_fp  = h_blank - h_bp - hsync;
 564
 565                 frame_width = image_width + h_blank;
 566         } else {
 567                 unsigned ideal_duty_cycle_per_myriad =
 568                         100 * CVT_C_PRIME - (CVT_M_PRIME * 100000) / hfreq;
 569                 int h_blank;
 570
 571                 if (ideal_duty_cycle_per_myriad < 2000)
 572                         ideal_duty_cycle_per_myriad = 2000;
 573
 574                 h_blank = image_width * ideal_duty_cycle_per_myriad /
 575                                         (10000 - ideal_duty_cycle_per_myriad);
 576                 h_blank = (h_blank / (2 * CVT_CELL_GRAN)) * 2 * CVT_CELL_GRAN;
 577
 578                 pix_clk = (image_width + h_blank) * hfreq;
 579                 pix_clk = (pix_clk / CVT_PXL_CLK_GRAN) * CVT_PXL_CLK_GRAN;
 580
 581                 h_bp = h_blank / 2;
 582                 frame_width = image_width + h_blank;
 583
 584                 hsync = frame_width * CVT_HSYNC_PERCENT / 100;
 585                 hsync = (hsync / CVT_CELL_GRAN) * CVT_CELL_GRAN;
 586                 h_fp = h_blank - hsync - h_bp;
 587         }
 588
 589         fmt->type = V4L2_DV_BT_656_1120;
 590         fmt->bt.polarities = polarities;
 591         fmt->bt.width = image_width;
 592         fmt->bt.height = image_height;
 593         fmt->bt.hfrontporch = h_fp;
 594         fmt->bt.vfrontporch = v_fp;
 595         fmt->bt.hsync = hsync;
 596         fmt->bt.vsync = vsync;
 597         fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync;
 598
 599         if (!interlaced) {
 600                 fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync;
 601                 fmt->bt.interlaced = V4L2_DV_PROGRESSIVE;
 602         } else {
 603                 fmt->bt.vbackporch = (frame_height - image_height - 2 * v_fp -
 604                                       2 * vsync) / 2;
 605                 fmt->bt.il_vbackporch = frame_height - image_height - 2 * v_fp -
 606                                         2 * vsync - fmt->bt.vbackporch;
 607                 fmt->bt.il_vfrontporch = v_fp;
 608                 fmt->bt.il_vsync = vsync;
 609                 fmt->bt.flags |= V4L2_DV_FL_HALF_LINE;
 610                 fmt->bt.interlaced = V4L2_DV_INTERLACED;
 611         }
 612
 613         fmt->bt.pixelclock = pix_clk;
 614         fmt->bt.standards = V4L2_DV_BT_STD_CVT;
 615
 616         if (reduced_blanking)
 617                 fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING;
 618
 619         return true;
 620 }
 621 EXPORT_SYMBOL_GPL(v4l2_detect_cvt);
 622
 623 /*
 624  * GTF defines
 625  * Based on Generalized Timing Formula Standard
 626  * Version 1.1 September 2, 1999
 627  */
 628
 629 #define GTF_PXL_CLK_GRAN        250000  /* pixel clock granularity */
 630
 631 #define GTF_MIN_VSYNC_BP        550     /* min time of vsync + back porch (us) */
 632 #define GTF_V_FP                1       /* vertical front porch (lines) */
 633 #define GTF_CELL_GRAN           8       /* character cell granularity */
 634
 635 /* Default */
 636 #define GTF_D_M                 600     /* blanking formula gradient */
 637 #define GTF_D_C                 40      /* blanking formula offset */
 638 #define GTF_D_K                 128     /* blanking formula scaling factor */
 639 #define GTF_D_J                 20      /* blanking formula scaling factor */
 640 #define GTF_D_C_PRIME ((((GTF_D_C - GTF_D_J) * GTF_D_K) / 256) + GTF_D_J)
 641 #define GTF_D_M_PRIME ((GTF_D_K * GTF_D_M) / 256)
 642
 643 /* Secondary */
 644 #define GTF_S_M                 3600    /* blanking formula gradient */
 645 #define GTF_S_C                 40      /* blanking formula offset */
 646 #define GTF_S_K                 128     /* blanking formula scaling factor */
 647 #define GTF_S_J                 35      /* blanking formula scaling factor */
 648 #define GTF_S_C_PRIME ((((GTF_S_C - GTF_S_J) * GTF_S_K) / 256) + GTF_S_J)
 649 #define GTF_S_M_PRIME ((GTF_S_K * GTF_S_M) / 256)
 650
 651 /** v4l2_detect_gtf - detect if the given timings follow the GTF standard
 652  * @frame_height - the total height of the frame (including blanking) in lines.
 653  * @hfreq - the horizontal frequency in Hz.
 654  * @vsync - the height of the vertical sync in lines.
 655  * @polarities - the horizontal and vertical polarities (same as struct
 656  *              v4l2_bt_timings polarities).
 657  * @interlaced - if this flag is true, it indicates interlaced format
 658  * @aspect - preferred aspect ratio. GTF has no method of determining the
 659  *              aspect ratio in order to derive the image width from the
 660  *              image height, so it has to be passed explicitly. Usually
 661  *              the native screen aspect ratio is used for this. If it
 662  *              is not filled in correctly, then 16:9 will be assumed.
 663  * @fmt - the resulting timings.
 664  *
 665  * This function will attempt to detect if the given values correspond to a
 666  * valid GTF format. If so, then it will return true, and fmt will be filled
 667  * in with the found GTF timings.
 668  */
 669 bool v4l2_detect_gtf(unsigned frame_height,
 670                 unsigned hfreq,
 671                 unsigned vsync,
 672                 u32 polarities,
 673                 bool interlaced,
 674                 struct v4l2_fract aspect,
 675                 struct v4l2_dv_timings *fmt)
 676 {
 677         int pix_clk;
 678         int  v_fp, v_bp, h_fp, hsync;
 679         int frame_width, image_height, image_width;
 680         bool default_gtf;
 681         int h_blank;
 682
 683         if (vsync != 3)
 684                 return false;
 685
 686         if (polarities == V4L2_DV_VSYNC_POS_POL)
 687                 default_gtf = true;
 688         else if (polarities == V4L2_DV_HSYNC_POS_POL)
 689                 default_gtf = false;
 690         else
 691                 return false;
 692
 693         if (hfreq == 0)
 694                 return false;
 695
 696         /* Vertical */
 697         v_fp = GTF_V_FP;
 698         v_bp = (GTF_MIN_VSYNC_BP * hfreq + 500000) / 1000000 - vsync;
 699         if (interlaced)
 700                 image_height = (frame_height - 2 * v_fp - 2 * vsync - 2 * v_bp) & ~0x1;
 701         else
 702                 image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
 703
 704         if (image_height < 0)
 705                 return false;
 706
 707         if (aspect.numerator == 0 || aspect.denominator == 0) {
 708                 aspect.numerator = 16;
 709                 aspect.denominator = 9;
 710         }
 711         image_width = ((image_height * aspect.numerator) / aspect.denominator);
 712         image_width = (image_width + GTF_CELL_GRAN/2) & ~(GTF_CELL_GRAN - 1);
 713
 714         /* Horizontal */
 715         if (default_gtf) {
 716                 u64 num;
 717                 u32 den;
 718
 719                 num = ((image_width * GTF_D_C_PRIME * (u64)hfreq) -
 720                       ((u64)image_width * GTF_D_M_PRIME * 1000));
 721                 den = (hfreq * (100 - GTF_D_C_PRIME) + GTF_D_M_PRIME * 1000) *
 722                       (2 * GTF_CELL_GRAN);
 723                 h_blank = div_u64((num + (den >> 1)), den);
 724                 h_blank *= (2 * GTF_CELL_GRAN);
 725         } else {
 726                 u64 num;
 727                 u32 den;
 728
 729                 num = ((image_width * GTF_S_C_PRIME * (u64)hfreq) -
 730                       ((u64)image_width * GTF_S_M_PRIME * 1000));
 731                 den = (hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000) *
 732                       (2 * GTF_CELL_GRAN);
 733                 h_blank = div_u64((num + (den >> 1)), den);
 734                 h_blank *= (2 * GTF_CELL_GRAN);
 735         }
 736
 737         frame_width = image_width + h_blank;
 738
 739         pix_clk = (image_width + h_blank) * hfreq;
 740         pix_clk = pix_clk / GTF_PXL_CLK_GRAN * GTF_PXL_CLK_GRAN;
 741
 742         hsync = (frame_width * 8 + 50) / 100;
 743         hsync = ((hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN) * GTF_CELL_GRAN;
 744
 745         h_fp = h_blank / 2 - hsync;
 746
 747         fmt->type = V4L2_DV_BT_656_1120;
 748         fmt->bt.polarities = polarities;
 749         fmt->bt.width = image_width;
 750         fmt->bt.height = image_height;
 751         fmt->bt.hfrontporch = h_fp;
 752         fmt->bt.vfrontporch = v_fp;
 753         fmt->bt.hsync = hsync;
 754         fmt->bt.vsync = vsync;
 755         fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync;
 756
 757         if (!interlaced) {
 758                 fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync;
 759                 fmt->bt.interlaced = V4L2_DV_PROGRESSIVE;
 760         } else {
 761                 fmt->bt.vbackporch = (frame_height - image_height - 2 * v_fp -
 762                                       2 * vsync) / 2;
 763                 fmt->bt.il_vbackporch = frame_height - image_height - 2 * v_fp -
 764                                         2 * vsync - fmt->bt.vbackporch;
 765                 fmt->bt.il_vfrontporch = v_fp;
 766                 fmt->bt.il_vsync = vsync;
 767                 fmt->bt.flags |= V4L2_DV_FL_HALF_LINE;
 768                 fmt->bt.interlaced = V4L2_DV_INTERLACED;
 769         }
 770
 771         fmt->bt.pixelclock = pix_clk;
 772         fmt->bt.standards = V4L2_DV_BT_STD_GTF;
 773
 774         if (!default_gtf)
 775                 fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING;
 776
 777         return true;
 778 }
 779 EXPORT_SYMBOL_GPL(v4l2_detect_gtf);
 780
 781 /** v4l2_calc_aspect_ratio - calculate the aspect ratio based on bytes
 782  *      0x15 and 0x16 from the EDID.
 783  * @hor_landscape - byte 0x15 from the EDID.
 784  * @vert_portrait - byte 0x16 from the EDID.
 785  *
 786  * Determines the aspect ratio from the EDID.
 787  * See VESA Enhanced EDID standard, release A, rev 2, section 3.6.2:
 788  * "Horizontal and Vertical Screen Size or Aspect Ratio"
 789  */
 790 struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait)
 791 {
 792         struct v4l2_fract aspect = { 16, 9 };
 793         u8 ratio;
 794
 795         /* Nothing filled in, fallback to 16:9 */
 796         if (!hor_landscape && !vert_portrait)
 797                 return aspect;
 798         /* Both filled in, so they are interpreted as the screen size in cm */
 799         if (hor_landscape && vert_portrait) {
 800                 aspect.numerator = hor_landscape;
 801                 aspect.denominator = vert_portrait;
 802                 return aspect;
 803         }
 804         /* Only one is filled in, so interpret them as a ratio:
 805            (val + 99) / 100 */
 806         ratio = hor_landscape | vert_portrait;
 807         /* Change some rounded values into the exact aspect ratio */
 808         if (ratio == 79) {
 809                 aspect.numerator = 16;
 810                 aspect.denominator = 9;
 811         } else if (ratio == 34) {
 812                 aspect.numerator = 4;
 813                 aspect.denominator = 3;
 814         } else if (ratio == 68) {
 815                 aspect.numerator = 15;
 816                 aspect.denominator = 9;
 817         } else {
 818                 aspect.numerator = hor_landscape + 99;
 819                 aspect.denominator = 100;
 820         }
 821         if (hor_landscape)
 822                 return aspect;
 823         /* The aspect ratio is for portrait, so swap numerator and denominator */
 824         swap(aspect.denominator, aspect.numerator);
 825         return aspect;
 826 }
 827 EXPORT_SYMBOL_GPL(v4l2_calc_aspect_ratio);
 828
 829 /** v4l2_hdmi_rx_colorimetry - determine HDMI colorimetry information
 830  *      based on various InfoFrames.
 831  * @avi: the AVI InfoFrame
 832  * @hdmi: the HDMI Vendor InfoFrame, may be NULL
 833  * @height: the frame height
 834  *
 835  * Determines the HDMI colorimetry information, i.e. how the HDMI
 836  * pixel color data should be interpreted.
 837  *
 838  * Note that some of the newer features (DCI-P3, HDR) are not yet
 839  * implemented: the hdmi.h header needs to be updated to the HDMI 2.0
 840  * and CTA-861-G standards.
 841  */
 842 struct v4l2_hdmi_colorimetry
 843 v4l2_hdmi_rx_colorimetry(const struct hdmi_avi_infoframe *avi,
 844                          const struct hdmi_vendor_infoframe *hdmi,
 845                          unsigned int height)
 846 {
 847         struct v4l2_hdmi_colorimetry c = {
 848                 V4L2_COLORSPACE_SRGB,
 849                 V4L2_YCBCR_ENC_DEFAULT,
 850                 V4L2_QUANTIZATION_FULL_RANGE,
 851                 V4L2_XFER_FUNC_SRGB
 852         };
 853         bool is_ce = avi->video_code || (hdmi && hdmi->vic);
 854         bool is_sdtv = height <= 576;
 855         bool default_is_lim_range_rgb = avi->video_code > 1;
 856
 857         switch (avi->colorspace) {
 858         case HDMI_COLORSPACE_RGB:
 859                 /* RGB pixel encoding */
 860                 switch (avi->colorimetry) {
 861                 case HDMI_COLORIMETRY_EXTENDED:
 862                         switch (avi->extended_colorimetry) {
 863                         case HDMI_EXTENDED_COLORIMETRY_OPRGB:
 864                                 c.colorspace = V4L2_COLORSPACE_OPRGB;
 865                                 c.xfer_func = V4L2_XFER_FUNC_OPRGB;
 866                                 break;
 867                         case HDMI_EXTENDED_COLORIMETRY_BT2020:
 868                                 c.colorspace = V4L2_COLORSPACE_BT2020;
 869                                 c.xfer_func = V4L2_XFER_FUNC_709;
 870                                 break;
 871                         default:
 872                                 break;
 873                         }
 874                         break;
 875                 default:
 876                         break;
 877                 }
 878                 switch (avi->quantization_range) {
 879                 case HDMI_QUANTIZATION_RANGE_LIMITED:
 880                         c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
 881                         break;
 882                 case HDMI_QUANTIZATION_RANGE_FULL:
 883                         break;
 884                 default:
 885                         if (default_is_lim_range_rgb)
 886                                 c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
 887                         break;
 888                 }
 889                 break;
 890
 891         default:
 892                 /* YCbCr pixel encoding */
 893                 c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
 894                 switch (avi->colorimetry) {
 895                 case HDMI_COLORIMETRY_NONE:
 896                         if (!is_ce)
 897                                 break;
 898                         if (is_sdtv) {
 899                                 c.colorspace = V4L2_COLORSPACE_SMPTE170M;
 900                                 c.ycbcr_enc = V4L2_YCBCR_ENC_601;
 901                         } else {
 902                                 c.colorspace = V4L2_COLORSPACE_REC709;
 903                                 c.ycbcr_enc = V4L2_YCBCR_ENC_709;
 904                         }
 905                         c.xfer_func = V4L2_XFER_FUNC_709;
 906                         break;
 907                 case HDMI_COLORIMETRY_ITU_601:
 908                         c.colorspace = V4L2_COLORSPACE_SMPTE170M;
 909                         c.ycbcr_enc = V4L2_YCBCR_ENC_601;
 910                         c.xfer_func = V4L2_XFER_FUNC_709;
 911                         break;
 912                 case HDMI_COLORIMETRY_ITU_709:
 913                         c.colorspace = V4L2_COLORSPACE_REC709;
 914                         c.ycbcr_enc = V4L2_YCBCR_ENC_709;
 915                         c.xfer_func = V4L2_XFER_FUNC_709;
 916                         break;
 917                 case HDMI_COLORIMETRY_EXTENDED:
 918                         switch (avi->extended_colorimetry) {
 919                         case HDMI_EXTENDED_COLORIMETRY_XV_YCC_601:
 920                                 c.colorspace = V4L2_COLORSPACE_REC709;
 921                                 c.ycbcr_enc = V4L2_YCBCR_ENC_XV709;
 922                                 c.xfer_func = V4L2_XFER_FUNC_709;
 923                                 break;
 924                         case HDMI_EXTENDED_COLORIMETRY_XV_YCC_709:
 925                                 c.colorspace = V4L2_COLORSPACE_REC709;
 926                                 c.ycbcr_enc = V4L2_YCBCR_ENC_XV601;
 927                                 c.xfer_func = V4L2_XFER_FUNC_709;
 928                                 break;
 929                         case HDMI_EXTENDED_COLORIMETRY_S_YCC_601:
 930                                 c.colorspace = V4L2_COLORSPACE_SRGB;
 931                                 c.ycbcr_enc = V4L2_YCBCR_ENC_601;
 932                                 c.xfer_func = V4L2_XFER_FUNC_SRGB;
 933                                 break;
 934                         case HDMI_EXTENDED_COLORIMETRY_OPYCC_601:
 935                                 c.colorspace = V4L2_COLORSPACE_OPRGB;
 936                                 c.ycbcr_enc = V4L2_YCBCR_ENC_601;
 937                                 c.xfer_func = V4L2_XFER_FUNC_OPRGB;
 938                                 break;
 939                         case HDMI_EXTENDED_COLORIMETRY_BT2020:
 940                                 c.colorspace = V4L2_COLORSPACE_BT2020;
 941                                 c.ycbcr_enc = V4L2_YCBCR_ENC_BT2020;
 942                                 c.xfer_func = V4L2_XFER_FUNC_709;
 943                                 break;
 944                         case HDMI_EXTENDED_COLORIMETRY_BT2020_CONST_LUM:
 945                                 c.colorspace = V4L2_COLORSPACE_BT2020;
 946                                 c.ycbcr_enc = V4L2_YCBCR_ENC_BT2020_CONST_LUM;
 947                                 c.xfer_func = V4L2_XFER_FUNC_709;
 948                                 break;
 949                         default: /* fall back to ITU_709 */
 950                                 c.colorspace = V4L2_COLORSPACE_REC709;
 951                                 c.ycbcr_enc = V4L2_YCBCR_ENC_709;
 952                                 c.xfer_func = V4L2_XFER_FUNC_709;
 953                                 break;
 954                         }
 955                         break;
 956                 default:
 957                         break;
 958                 }
 959                 /*
 960                  * YCC Quantization Range signaling is more-or-less broken,
 961                  * let's just ignore this.
 962                  */
 963                 break;
 964         }
 965         return c;
 966 }
 967 EXPORT_SYMBOL_GPL(v4l2_hdmi_rx_colorimetry);
 968
 969 /**
 970  * v4l2_get_edid_phys_addr() - find and return the physical address
 971  *
 972  * @edid:       pointer to the EDID data
 973  * @size:       size in bytes of the EDID data
 974  * @offset:     If not %NULL then the location of the physical address
 975  *              bytes in the EDID will be returned here. This is set to 0
 976  *              if there is no physical address found.
 977  *
 978  * Return: the physical address or CEC_PHYS_ADDR_INVALID if there is none.
 979  */
 980 u16 v4l2_get_edid_phys_addr(const u8 *edid, unsigned int size,
 981                             unsigned int *offset)
 982 {
 983         unsigned int loc = cec_get_edid_spa_location(edid, size);
 984
 985         if (offset)
 986                 *offset = loc;
 987         if (loc == 0)
 988                 return CEC_PHYS_ADDR_INVALID;
 989         return (edid[loc] << 8) | edid[loc + 1];
 990 }
 991 EXPORT_SYMBOL_GPL(v4l2_get_edid_phys_addr);
 992
 993 /**
 994  * v4l2_set_edid_phys_addr() - find and set the physical address
 995  *
 996  * @edid:       pointer to the EDID data
 997  * @size:       size in bytes of the EDID data
 998  * @phys_addr:  the new physical address
 999  *
1000  * This function finds the location of the physical address in the EDID
1001  * and fills in the given physical address and updates the checksum
1002  * at the end of the EDID block. It does nothing if the EDID doesn't
1003  * contain a physical address.
1004  */
1005 void v4l2_set_edid_phys_addr(u8 *edid, unsigned int size, u16 phys_addr)
1006 {
1007         unsigned int loc = cec_get_edid_spa_location(edid, size);
1008         u8 sum = 0;
1009         unsigned int i;
1010
1011         if (loc == 0)
1012                 return;
1013         edid[loc] = phys_addr >> 8;
1014         edid[loc + 1] = phys_addr & 0xff;
1015         loc &= ~0x7f;
1016
1017         /* update the checksum */
1018         for (i = loc; i < loc + 127; i++)
1019                 sum += edid[i];
1020         edid[i] = 256 - sum;
1021 }
1022 EXPORT_SYMBOL_GPL(v4l2_set_edid_phys_addr);
1023
1024 /**
1025  * v4l2_phys_addr_for_input() - calculate the PA for an input
1026  *
1027  * @phys_addr:  the physical address of the parent
1028  * @input:      the number of the input port, must be between 1 and 15
1029  *
1030  * This function calculates a new physical address based on the input
1031  * port number. For example:
1032  *
1033  * PA = 0.0.0.0 and input = 2 becomes 2.0.0.0
1034  *
1035  * PA = 3.0.0.0 and input = 1 becomes 3.1.0.0
1036  *
1037  * PA = 3.2.1.0 and input = 5 becomes 3.2.1.5
1038  *
1039  * PA = 3.2.1.3 and input = 5 becomes f.f.f.f since it maxed out the depth.
1040  *
1041  * Return: the new physical address or CEC_PHYS_ADDR_INVALID.
1042  */
1043 u16 v4l2_phys_addr_for_input(u16 phys_addr, u8 input)
1044 {
1045         /* Check if input is sane */
1046         if (WARN_ON(input == 0 || input > 0xf))
1047                 return CEC_PHYS_ADDR_INVALID;
1048
1049         if (phys_addr == 0)
1050                 return input << 12;
1051
1052         if ((phys_addr & 0x0fff) == 0)
1053                 return phys_addr | (input << 8);
1054
1055         if ((phys_addr & 0x00ff) == 0)
1056                 return phys_addr | (input << 4);
1057
1058         if ((phys_addr & 0x000f) == 0)
1059                 return phys_addr | input;
1060
1061         /*
1062          * All nibbles are used so no valid physical addresses can be assigned
1063          * to the input.
1064          */
1065         return CEC_PHYS_ADDR_INVALID;
1066 }
1067 EXPORT_SYMBOL_GPL(v4l2_phys_addr_for_input);
1068
1069 /**
1070  * v4l2_phys_addr_validate() - validate a physical address from an EDID
1071  *
1072  * @phys_addr:  the physical address to validate
1073  * @parent:     if not %NULL, then this is filled with the parents PA.
1074  * @port:       if not %NULL, then this is filled with the input port.
1075  *
1076  * This validates a physical address as read from an EDID. If the
1077  * PA is invalid (such as 1.0.1.0 since '0' is only allowed at the end),
1078  * then it will return -EINVAL.
1079  *
1080  * The parent PA is passed into %parent and the input port is passed into
1081  * %port. For example:
1082  *
1083  * PA = 0.0.0.0: has parent 0.0.0.0 and input port 0.
1084  *
1085  * PA = 1.0.0.0: has parent 0.0.0.0 and input port 1.
1086  *
1087  * PA = 3.2.0.0: has parent 3.0.0.0 and input port 2.
1088  *
1089  * PA = f.f.f.f: has parent f.f.f.f and input port 0.
1090  *
1091  * Return: 0 if the PA is valid, -EINVAL if not.
1092  */
1093 int v4l2_phys_addr_validate(u16 phys_addr, u16 *parent, u16 *port)
1094 {
1095         int i;
1096
1097         if (parent)
1098                 *parent = phys_addr;
1099         if (port)
1100                 *port = 0;
1101         if (phys_addr == CEC_PHYS_ADDR_INVALID)
1102                 return 0;
1103         for (i = 0; i < 16; i += 4)
1104                 if (phys_addr & (0xf << i))
1105                         break;
1106         if (i == 16)
1107                 return 0;
1108         if (parent)
1109                 *parent = phys_addr & (0xfff0 << i);
1110         if (port)
1111                 *port = (phys_addr >> i) & 0xf;
1112         for (i += 4; i < 16; i += 4)
1113                 if ((phys_addr & (0xf << i)) == 0)
1114                         return -EINVAL;
1115         return 0;
1116 }
1117 EXPORT_SYMBOL_GPL(v4l2_phys_addr_validate);