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.%02u (%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 /** v4l2_calc_timeperframe - helper function to calculate timeperframe based
 400  *      v4l2_dv_timings fields.
 401  * @t - Timings for the video mode.
 402  *
 403  * Calculates the expected timeperframe using the pixel clock value and
 404  * horizontal/vertical measures. This means that v4l2_dv_timings structure
 405  * must be correctly and fully filled.
 406  */
 407 struct v4l2_fract v4l2_calc_timeperframe(const struct v4l2_dv_timings *t)
 408 {
 409         const struct v4l2_bt_timings *bt = &t->bt;
 410         struct v4l2_fract fps_fract = { 1, 1 };
 411         unsigned long n, d;
 412         u32 htot, vtot, fps;
 413         u64 pclk;
 414
 415         if (t->type != V4L2_DV_BT_656_1120)
 416                 return fps_fract;
 417
 418         htot = V4L2_DV_BT_FRAME_WIDTH(bt);
 419         vtot = V4L2_DV_BT_FRAME_HEIGHT(bt);
 420         pclk = bt->pixelclock;
 421
 422         if ((bt->flags & V4L2_DV_FL_CAN_DETECT_REDUCED_FPS) &&
 423             (bt->flags & V4L2_DV_FL_REDUCED_FPS))
 424                 pclk = div_u64(pclk * 1000ULL, 1001);
 425
 426         fps = (htot * vtot) > 0 ? div_u64((100 * pclk), (htot * vtot)) : 0;
 427         if (!fps)
 428                 return fps_fract;
 429
 430         rational_best_approximation(fps, 100, fps, 100, &n, &d);
 431
 432         fps_fract.numerator = d;
 433         fps_fract.denominator = n;
 434         return fps_fract;
 435 }
 436 EXPORT_SYMBOL_GPL(v4l2_calc_timeperframe);
 437
 438 /*
 439  * CVT defines
 440  * Based on Coordinated Video Timings Standard
 441  * version 1.1 September 10, 2003
 442  */
 443
 444 #define CVT_PXL_CLK_GRAN        250000  /* pixel clock granularity */
 445 #define CVT_PXL_CLK_GRAN_RB_V2 1000     /* granularity for reduced blanking v2*/
 446
 447 /* Normal blanking */
 448 #define CVT_MIN_V_BPORCH        7       /* lines */
 449 #define CVT_MIN_V_PORCH_RND     3       /* lines */
 450 #define CVT_MIN_VSYNC_BP        550     /* min time of vsync + back porch (us) */
 451 #define CVT_HSYNC_PERCENT       8       /* nominal hsync as percentage of line */
 452
 453 /* Normal blanking for CVT uses GTF to calculate horizontal blanking */
 454 #define CVT_CELL_GRAN           8       /* character cell granularity */
 455 #define CVT_M                   600     /* blanking formula gradient */
 456 #define CVT_C                   40      /* blanking formula offset */
 457 #define CVT_K                   128     /* blanking formula scaling factor */
 458 #define CVT_J                   20      /* blanking formula scaling factor */
 459 #define CVT_C_PRIME (((CVT_C - CVT_J) * CVT_K / 256) + CVT_J)
 460 #define CVT_M_PRIME (CVT_K * CVT_M / 256)
 461
 462 /* Reduced Blanking */
 463 #define CVT_RB_MIN_V_BPORCH    7       /* lines  */
 464 #define CVT_RB_V_FPORCH        3       /* lines  */
 465 #define CVT_RB_MIN_V_BLANK   460       /* us     */
 466 #define CVT_RB_H_SYNC         32       /* pixels */
 467 #define CVT_RB_H_BLANK       160       /* pixels */
 468 /* Reduce blanking Version 2 */
 469 #define CVT_RB_V2_H_BLANK     80       /* pixels */
 470 #define CVT_RB_MIN_V_FPORCH    3       /* lines  */
 471 #define CVT_RB_V2_MIN_V_FPORCH 1       /* lines  */
 472 #define CVT_RB_V_BPORCH        6       /* lines  */
 473
 474 /** v4l2_detect_cvt - detect if the given timings follow the CVT standard
 475  * @frame_height - the total height of the frame (including blanking) in lines.
 476  * @hfreq - the horizontal frequency in Hz.
 477  * @vsync - the height of the vertical sync in lines.
 478  * @active_width - active width of image (does not include blanking). This
 479  * information is needed only in case of version 2 of reduced blanking.
 480  * In other cases, this parameter does not have any effect on timings.
 481  * @polarities - the horizontal and vertical polarities (same as struct
 482  *              v4l2_bt_timings polarities).
 483  * @interlaced - if this flag is true, it indicates interlaced format
 484  * @fmt - the resulting timings.
 485  *
 486  * This function will attempt to detect if the given values correspond to a
 487  * valid CVT format. If so, then it will return true, and fmt will be filled
 488  * in with the found CVT timings.
 489  */
 490 bool v4l2_detect_cvt(unsigned frame_height,
 491                      unsigned hfreq,
 492                      unsigned vsync,
 493                      unsigned active_width,
 494                      u32 polarities,
 495                      bool interlaced,
 496                      struct v4l2_dv_timings *fmt)
 497 {
 498         int  v_fp, v_bp, h_fp, h_bp, hsync;
 499         int  frame_width, image_height, image_width;
 500         bool reduced_blanking;
 501         bool rb_v2 = false;
 502         unsigned pix_clk;
 503
 504         if (vsync < 4 || vsync > 8)
 505                 return false;
 506
 507         if (polarities == V4L2_DV_VSYNC_POS_POL)
 508                 reduced_blanking = false;
 509         else if (polarities == V4L2_DV_HSYNC_POS_POL)
 510                 reduced_blanking = true;
 511         else
 512                 return false;
 513
 514         if (reduced_blanking && vsync == 8)
 515                 rb_v2 = true;
 516
 517         if (rb_v2 && active_width == 0)
 518                 return false;
 519
 520         if (!rb_v2 && vsync > 7)
 521                 return false;
 522
 523         if (hfreq == 0)
 524                 return false;
 525
 526         /* Vertical */
 527         if (reduced_blanking) {
 528                 if (rb_v2) {
 529                         v_bp = CVT_RB_V_BPORCH;
 530                         v_fp = (CVT_RB_MIN_V_BLANK * hfreq) / 1000000 + 1;
 531                         v_fp -= vsync + v_bp;
 532
 533                         if (v_fp < CVT_RB_V2_MIN_V_FPORCH)
 534                                 v_fp = CVT_RB_V2_MIN_V_FPORCH;
 535                 } else {
 536                         v_fp = CVT_RB_V_FPORCH;
 537                         v_bp = (CVT_RB_MIN_V_BLANK * hfreq) / 1000000 + 1;
 538                         v_bp -= vsync + v_fp;
 539
 540                         if (v_bp < CVT_RB_MIN_V_BPORCH)
 541                                 v_bp = CVT_RB_MIN_V_BPORCH;
 542                 }
 543         } else {
 544                 v_fp = CVT_MIN_V_PORCH_RND;
 545                 v_bp = (CVT_MIN_VSYNC_BP * hfreq) / 1000000 + 1 - vsync;
 546
 547                 if (v_bp < CVT_MIN_V_BPORCH)
 548                         v_bp = CVT_MIN_V_BPORCH;
 549         }
 550
 551         if (interlaced)
 552                 image_height = (frame_height - 2 * v_fp - 2 * vsync - 2 * v_bp) & ~0x1;
 553         else
 554                 image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
 555
 556         if (image_height < 0)
 557                 return false;
 558
 559         /* Aspect ratio based on vsync */
 560         switch (vsync) {
 561         case 4:
 562                 image_width = (image_height * 4) / 3;
 563                 break;
 564         case 5:
 565                 image_width = (image_height * 16) / 9;
 566                 break;
 567         case 6:
 568                 image_width = (image_height * 16) / 10;
 569                 break;
 570         case 7:
 571                 /* special case */
 572                 if (image_height == 1024)
 573                         image_width = (image_height * 5) / 4;
 574                 else if (image_height == 768)
 575                         image_width = (image_height * 15) / 9;
 576                 else
 577                         return false;
 578                 break;
 579         case 8:
 580                 image_width = active_width;
 581                 break;
 582         default:
 583                 return false;
 584         }
 585
 586         if (!rb_v2)
 587                 image_width = image_width & ~7;
 588
 589         /* Horizontal */
 590         if (reduced_blanking) {
 591                 int h_blank;
 592                 int clk_gran;
 593
 594                 h_blank = rb_v2 ? CVT_RB_V2_H_BLANK : CVT_RB_H_BLANK;
 595                 clk_gran = rb_v2 ? CVT_PXL_CLK_GRAN_RB_V2 : CVT_PXL_CLK_GRAN;
 596
 597                 pix_clk = (image_width + h_blank) * hfreq;
 598                 pix_clk = (pix_clk / clk_gran) * clk_gran;
 599
 600                 h_bp  = h_blank / 2;
 601                 hsync = CVT_RB_H_SYNC;
 602                 h_fp  = h_blank - h_bp - hsync;
 603
 604                 frame_width = image_width + h_blank;
 605         } else {
 606                 unsigned ideal_duty_cycle_per_myriad =
 607                         100 * CVT_C_PRIME - (CVT_M_PRIME * 100000) / hfreq;
 608                 int h_blank;
 609
 610                 if (ideal_duty_cycle_per_myriad < 2000)
 611                         ideal_duty_cycle_per_myriad = 2000;
 612
 613                 h_blank = image_width * ideal_duty_cycle_per_myriad /
 614                                         (10000 - ideal_duty_cycle_per_myriad);
 615                 h_blank = (h_blank / (2 * CVT_CELL_GRAN)) * 2 * CVT_CELL_GRAN;
 616
 617                 pix_clk = (image_width + h_blank) * hfreq;
 618                 pix_clk = (pix_clk / CVT_PXL_CLK_GRAN) * CVT_PXL_CLK_GRAN;
 619
 620                 h_bp = h_blank / 2;
 621                 frame_width = image_width + h_blank;
 622
 623                 hsync = frame_width * CVT_HSYNC_PERCENT / 100;
 624                 hsync = (hsync / CVT_CELL_GRAN) * CVT_CELL_GRAN;
 625                 h_fp = h_blank - hsync - h_bp;
 626         }
 627
 628         fmt->type = V4L2_DV_BT_656_1120;
 629         fmt->bt.polarities = polarities;
 630         fmt->bt.width = image_width;
 631         fmt->bt.height = image_height;
 632         fmt->bt.hfrontporch = h_fp;
 633         fmt->bt.vfrontporch = v_fp;
 634         fmt->bt.hsync = hsync;
 635         fmt->bt.vsync = vsync;
 636         fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync;
 637
 638         if (!interlaced) {
 639                 fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync;
 640                 fmt->bt.interlaced = V4L2_DV_PROGRESSIVE;
 641         } else {
 642                 fmt->bt.vbackporch = (frame_height - image_height - 2 * v_fp -
 643                                       2 * vsync) / 2;
 644                 fmt->bt.il_vbackporch = frame_height - image_height - 2 * v_fp -
 645                                         2 * vsync - fmt->bt.vbackporch;
 646                 fmt->bt.il_vfrontporch = v_fp;
 647                 fmt->bt.il_vsync = vsync;
 648                 fmt->bt.flags |= V4L2_DV_FL_HALF_LINE;
 649                 fmt->bt.interlaced = V4L2_DV_INTERLACED;
 650         }
 651
 652         fmt->bt.pixelclock = pix_clk;
 653         fmt->bt.standards = V4L2_DV_BT_STD_CVT;
 654
 655         if (reduced_blanking)
 656                 fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING;
 657
 658         return true;
 659 }
 660 EXPORT_SYMBOL_GPL(v4l2_detect_cvt);
 661
 662 /*
 663  * GTF defines
 664  * Based on Generalized Timing Formula Standard
 665  * Version 1.1 September 2, 1999
 666  */
 667
 668 #define GTF_PXL_CLK_GRAN        250000  /* pixel clock granularity */
 669
 670 #define GTF_MIN_VSYNC_BP        550     /* min time of vsync + back porch (us) */
 671 #define GTF_V_FP                1       /* vertical front porch (lines) */
 672 #define GTF_CELL_GRAN           8       /* character cell granularity */
 673
 674 /* Default */
 675 #define GTF_D_M                 600     /* blanking formula gradient */
 676 #define GTF_D_C                 40      /* blanking formula offset */
 677 #define GTF_D_K                 128     /* blanking formula scaling factor */
 678 #define GTF_D_J                 20      /* blanking formula scaling factor */
 679 #define GTF_D_C_PRIME ((((GTF_D_C - GTF_D_J) * GTF_D_K) / 256) + GTF_D_J)
 680 #define GTF_D_M_PRIME ((GTF_D_K * GTF_D_M) / 256)
 681
 682 /* Secondary */
 683 #define GTF_S_M                 3600    /* blanking formula gradient */
 684 #define GTF_S_C                 40      /* blanking formula offset */
 685 #define GTF_S_K                 128     /* blanking formula scaling factor */
 686 #define GTF_S_J                 35      /* blanking formula scaling factor */
 687 #define GTF_S_C_PRIME ((((GTF_S_C - GTF_S_J) * GTF_S_K) / 256) + GTF_S_J)
 688 #define GTF_S_M_PRIME ((GTF_S_K * GTF_S_M) / 256)
 689
 690 /** v4l2_detect_gtf - detect if the given timings follow the GTF standard
 691  * @frame_height - the total height of the frame (including blanking) in lines.
 692  * @hfreq - the horizontal frequency in Hz.
 693  * @vsync - the height of the vertical sync in lines.
 694  * @polarities - the horizontal and vertical polarities (same as struct
 695  *              v4l2_bt_timings polarities).
 696  * @interlaced - if this flag is true, it indicates interlaced format
 697  * @aspect - preferred aspect ratio. GTF has no method of determining the
 698  *              aspect ratio in order to derive the image width from the
 699  *              image height, so it has to be passed explicitly. Usually
 700  *              the native screen aspect ratio is used for this. If it
 701  *              is not filled in correctly, then 16:9 will be assumed.
 702  * @fmt - the resulting timings.
 703  *
 704  * This function will attempt to detect if the given values correspond to a
 705  * valid GTF format. If so, then it will return true, and fmt will be filled
 706  * in with the found GTF timings.
 707  */
 708 bool v4l2_detect_gtf(unsigned frame_height,
 709                 unsigned hfreq,
 710                 unsigned vsync,
 711                 u32 polarities,
 712                 bool interlaced,
 713                 struct v4l2_fract aspect,
 714                 struct v4l2_dv_timings *fmt)
 715 {
 716         int pix_clk;
 717         int  v_fp, v_bp, h_fp, hsync;
 718         int frame_width, image_height, image_width;
 719         bool default_gtf;
 720         int h_blank;
 721
 722         if (vsync != 3)
 723                 return false;
 724
 725         if (polarities == V4L2_DV_VSYNC_POS_POL)
 726                 default_gtf = true;
 727         else if (polarities == V4L2_DV_HSYNC_POS_POL)
 728                 default_gtf = false;
 729         else
 730                 return false;
 731
 732         if (hfreq == 0)
 733                 return false;
 734
 735         /* Vertical */
 736         v_fp = GTF_V_FP;
 737         v_bp = (GTF_MIN_VSYNC_BP * hfreq + 500000) / 1000000 - vsync;
 738         if (interlaced)
 739                 image_height = (frame_height - 2 * v_fp - 2 * vsync - 2 * v_bp) & ~0x1;
 740         else
 741                 image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
 742
 743         if (image_height < 0)
 744                 return false;
 745
 746         if (aspect.numerator == 0 || aspect.denominator == 0) {
 747                 aspect.numerator = 16;
 748                 aspect.denominator = 9;
 749         }
 750         image_width = ((image_height * aspect.numerator) / aspect.denominator);
 751         image_width = (image_width + GTF_CELL_GRAN/2) & ~(GTF_CELL_GRAN - 1);
 752
 753         /* Horizontal */
 754         if (default_gtf) {
 755                 u64 num;
 756                 u32 den;
 757
 758                 num = ((image_width * GTF_D_C_PRIME * (u64)hfreq) -
 759                       ((u64)image_width * GTF_D_M_PRIME * 1000));
 760                 den = (hfreq * (100 - GTF_D_C_PRIME) + GTF_D_M_PRIME * 1000) *
 761                       (2 * GTF_CELL_GRAN);
 762                 h_blank = div_u64((num + (den >> 1)), den);
 763                 h_blank *= (2 * GTF_CELL_GRAN);
 764         } else {
 765                 u64 num;
 766                 u32 den;
 767
 768                 num = ((image_width * GTF_S_C_PRIME * (u64)hfreq) -
 769                       ((u64)image_width * GTF_S_M_PRIME * 1000));
 770                 den = (hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000) *
 771                       (2 * GTF_CELL_GRAN);
 772                 h_blank = div_u64((num + (den >> 1)), den);
 773                 h_blank *= (2 * GTF_CELL_GRAN);
 774         }
 775
 776         frame_width = image_width + h_blank;
 777
 778         pix_clk = (image_width + h_blank) * hfreq;
 779         pix_clk = pix_clk / GTF_PXL_CLK_GRAN * GTF_PXL_CLK_GRAN;
 780
 781         hsync = (frame_width * 8 + 50) / 100;
 782         hsync = DIV_ROUND_CLOSEST(hsync, GTF_CELL_GRAN) * GTF_CELL_GRAN;
 783
 784         h_fp = h_blank / 2 - hsync;
 785
 786         fmt->type = V4L2_DV_BT_656_1120;
 787         fmt->bt.polarities = polarities;
 788         fmt->bt.width = image_width;
 789         fmt->bt.height = image_height;
 790         fmt->bt.hfrontporch = h_fp;
 791         fmt->bt.vfrontporch = v_fp;
 792         fmt->bt.hsync = hsync;
 793         fmt->bt.vsync = vsync;
 794         fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync;
 795
 796         if (!interlaced) {
 797                 fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync;
 798                 fmt->bt.interlaced = V4L2_DV_PROGRESSIVE;
 799         } else {
 800                 fmt->bt.vbackporch = (frame_height - image_height - 2 * v_fp -
 801                                       2 * vsync) / 2;
 802                 fmt->bt.il_vbackporch = frame_height - image_height - 2 * v_fp -
 803                                         2 * vsync - fmt->bt.vbackporch;
 804                 fmt->bt.il_vfrontporch = v_fp;
 805                 fmt->bt.il_vsync = vsync;
 806                 fmt->bt.flags |= V4L2_DV_FL_HALF_LINE;
 807                 fmt->bt.interlaced = V4L2_DV_INTERLACED;
 808         }
 809
 810         fmt->bt.pixelclock = pix_clk;
 811         fmt->bt.standards = V4L2_DV_BT_STD_GTF;
 812
 813         if (!default_gtf)
 814                 fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING;
 815
 816         return true;
 817 }
 818 EXPORT_SYMBOL_GPL(v4l2_detect_gtf);
 819
 820 /** v4l2_calc_aspect_ratio - calculate the aspect ratio based on bytes
 821  *      0x15 and 0x16 from the EDID.
 822  * @hor_landscape - byte 0x15 from the EDID.
 823  * @vert_portrait - byte 0x16 from the EDID.
 824  *
 825  * Determines the aspect ratio from the EDID.
 826  * See VESA Enhanced EDID standard, release A, rev 2, section 3.6.2:
 827  * "Horizontal and Vertical Screen Size or Aspect Ratio"
 828  */
 829 struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait)
 830 {
 831         struct v4l2_fract aspect = { 16, 9 };
 832         u8 ratio;
 833
 834         /* Nothing filled in, fallback to 16:9 */
 835         if (!hor_landscape && !vert_portrait)
 836                 return aspect;
 837         /* Both filled in, so they are interpreted as the screen size in cm */
 838         if (hor_landscape && vert_portrait) {
 839                 aspect.numerator = hor_landscape;
 840                 aspect.denominator = vert_portrait;
 841                 return aspect;
 842         }
 843         /* Only one is filled in, so interpret them as a ratio:
 844            (val + 99) / 100 */
 845         ratio = hor_landscape | vert_portrait;
 846         /* Change some rounded values into the exact aspect ratio */
 847         if (ratio == 79) {
 848                 aspect.numerator = 16;
 849                 aspect.denominator = 9;
 850         } else if (ratio == 34) {
 851                 aspect.numerator = 4;
 852                 aspect.denominator = 3;
 853         } else if (ratio == 68) {
 854                 aspect.numerator = 15;
 855                 aspect.denominator = 9;
 856         } else {
 857                 aspect.numerator = hor_landscape + 99;
 858                 aspect.denominator = 100;
 859         }
 860         if (hor_landscape)
 861                 return aspect;
 862         /* The aspect ratio is for portrait, so swap numerator and denominator */
 863         swap(aspect.denominator, aspect.numerator);
 864         return aspect;
 865 }
 866 EXPORT_SYMBOL_GPL(v4l2_calc_aspect_ratio);
 867
 868 /** v4l2_hdmi_rx_colorimetry - determine HDMI colorimetry information
 869  *      based on various InfoFrames.
 870  * @avi: the AVI InfoFrame
 871  * @hdmi: the HDMI Vendor InfoFrame, may be NULL
 872  * @height: the frame height
 873  *
 874  * Determines the HDMI colorimetry information, i.e. how the HDMI
 875  * pixel color data should be interpreted.
 876  *
 877  * Note that some of the newer features (DCI-P3, HDR) are not yet
 878  * implemented: the hdmi.h header needs to be updated to the HDMI 2.0
 879  * and CTA-861-G standards.
 880  */
 881 struct v4l2_hdmi_colorimetry
 882 v4l2_hdmi_rx_colorimetry(const struct hdmi_avi_infoframe *avi,
 883                          const struct hdmi_vendor_infoframe *hdmi,
 884                          unsigned int height)
 885 {
 886         struct v4l2_hdmi_colorimetry c = {
 887                 V4L2_COLORSPACE_SRGB,
 888                 V4L2_YCBCR_ENC_DEFAULT,
 889                 V4L2_QUANTIZATION_FULL_RANGE,
 890                 V4L2_XFER_FUNC_SRGB
 891         };
 892         bool is_ce = avi->video_code || (hdmi && hdmi->vic);
 893         bool is_sdtv = height <= 576;
 894         bool default_is_lim_range_rgb = avi->video_code > 1;
 895
 896         switch (avi->colorspace) {
 897         case HDMI_COLORSPACE_RGB:
 898                 /* RGB pixel encoding */
 899                 switch (avi->colorimetry) {
 900                 case HDMI_COLORIMETRY_EXTENDED:
 901                         switch (avi->extended_colorimetry) {
 902                         case HDMI_EXTENDED_COLORIMETRY_OPRGB:
 903                                 c.colorspace = V4L2_COLORSPACE_OPRGB;
 904                                 c.xfer_func = V4L2_XFER_FUNC_OPRGB;
 905                                 break;
 906                         case HDMI_EXTENDED_COLORIMETRY_BT2020:
 907                                 c.colorspace = V4L2_COLORSPACE_BT2020;
 908                                 c.xfer_func = V4L2_XFER_FUNC_709;
 909                                 break;
 910                         default:
 911                                 break;
 912                         }
 913                         break;
 914                 default:
 915                         break;
 916                 }
 917                 switch (avi->quantization_range) {
 918                 case HDMI_QUANTIZATION_RANGE_LIMITED:
 919                         c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
 920                         break;
 921                 case HDMI_QUANTIZATION_RANGE_FULL:
 922                         break;
 923                 default:
 924                         if (default_is_lim_range_rgb)
 925                                 c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
 926                         break;
 927                 }
 928                 break;
 929
 930         default:
 931                 /* YCbCr pixel encoding */
 932                 c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
 933                 switch (avi->colorimetry) {
 934                 case HDMI_COLORIMETRY_NONE:
 935                         if (!is_ce)
 936                                 break;
 937                         if (is_sdtv) {
 938                                 c.colorspace = V4L2_COLORSPACE_SMPTE170M;
 939                                 c.ycbcr_enc = V4L2_YCBCR_ENC_601;
 940                         } else {
 941                                 c.colorspace = V4L2_COLORSPACE_REC709;
 942                                 c.ycbcr_enc = V4L2_YCBCR_ENC_709;
 943                         }
 944                         c.xfer_func = V4L2_XFER_FUNC_709;
 945                         break;
 946                 case HDMI_COLORIMETRY_ITU_601:
 947                         c.colorspace = V4L2_COLORSPACE_SMPTE170M;
 948                         c.ycbcr_enc = V4L2_YCBCR_ENC_601;
 949                         c.xfer_func = V4L2_XFER_FUNC_709;
 950                         break;
 951                 case HDMI_COLORIMETRY_ITU_709:
 952                         c.colorspace = V4L2_COLORSPACE_REC709;
 953                         c.ycbcr_enc = V4L2_YCBCR_ENC_709;
 954                         c.xfer_func = V4L2_XFER_FUNC_709;
 955                         break;
 956                 case HDMI_COLORIMETRY_EXTENDED:
 957                         switch (avi->extended_colorimetry) {
 958                         case HDMI_EXTENDED_COLORIMETRY_XV_YCC_601:
 959                                 c.colorspace = V4L2_COLORSPACE_REC709;
 960                                 c.ycbcr_enc = V4L2_YCBCR_ENC_XV709;
 961                                 c.xfer_func = V4L2_XFER_FUNC_709;
 962                                 break;
 963                         case HDMI_EXTENDED_COLORIMETRY_XV_YCC_709:
 964                                 c.colorspace = V4L2_COLORSPACE_REC709;
 965                                 c.ycbcr_enc = V4L2_YCBCR_ENC_XV601;
 966                                 c.xfer_func = V4L2_XFER_FUNC_709;
 967                                 break;
 968                         case HDMI_EXTENDED_COLORIMETRY_S_YCC_601:
 969                                 c.colorspace = V4L2_COLORSPACE_SRGB;
 970                                 c.ycbcr_enc = V4L2_YCBCR_ENC_601;
 971                                 c.xfer_func = V4L2_XFER_FUNC_SRGB;
 972                                 break;
 973                         case HDMI_EXTENDED_COLORIMETRY_OPYCC_601:
 974                                 c.colorspace = V4L2_COLORSPACE_OPRGB;
 975                                 c.ycbcr_enc = V4L2_YCBCR_ENC_601;
 976                                 c.xfer_func = V4L2_XFER_FUNC_OPRGB;
 977                                 break;
 978                         case HDMI_EXTENDED_COLORIMETRY_BT2020:
 979                                 c.colorspace = V4L2_COLORSPACE_BT2020;
 980                                 c.ycbcr_enc = V4L2_YCBCR_ENC_BT2020;
 981                                 c.xfer_func = V4L2_XFER_FUNC_709;
 982                                 break;
 983                         case HDMI_EXTENDED_COLORIMETRY_BT2020_CONST_LUM:
 984                                 c.colorspace = V4L2_COLORSPACE_BT2020;
 985                                 c.ycbcr_enc = V4L2_YCBCR_ENC_BT2020_CONST_LUM;
 986                                 c.xfer_func = V4L2_XFER_FUNC_709;
 987                                 break;
 988                         default: /* fall back to ITU_709 */
 989                                 c.colorspace = V4L2_COLORSPACE_REC709;
 990                                 c.ycbcr_enc = V4L2_YCBCR_ENC_709;
 991                                 c.xfer_func = V4L2_XFER_FUNC_709;
 992                                 break;
 993                         }
 994                         break;
 995                 default:
 996                         break;
 997                 }
 998                 /*
 999                  * YCC Quantization Range signaling is more-or-less broken,
1000                  * let's just ignore this.
1001                  */
1002                 break;
1003         }
1004         return c;
1005 }
1006 EXPORT_SYMBOL_GPL(v4l2_hdmi_rx_colorimetry);
1007
1008 /**
1009  * v4l2_get_edid_phys_addr() - find and return the physical address
1010  *
1011  * @edid:       pointer to the EDID data
1012  * @size:       size in bytes of the EDID data
1013  * @offset:     If not %NULL then the location of the physical address
1014  *              bytes in the EDID will be returned here. This is set to 0
1015  *              if there is no physical address found.
1016  *
1017  * Return: the physical address or CEC_PHYS_ADDR_INVALID if there is none.
1018  */
1019 u16 v4l2_get_edid_phys_addr(const u8 *edid, unsigned int size,
1020                             unsigned int *offset)
1021 {
1022         unsigned int loc = cec_get_edid_spa_location(edid, size);
1023
1024         if (offset)
1025                 *offset = loc;
1026         if (loc == 0)
1027                 return CEC_PHYS_ADDR_INVALID;
1028         return (edid[loc] << 8) | edid[loc + 1];
1029 }
1030 EXPORT_SYMBOL_GPL(v4l2_get_edid_phys_addr);
1031
1032 /**
1033  * v4l2_set_edid_phys_addr() - find and set the physical address
1034  *
1035  * @edid:       pointer to the EDID data
1036  * @size:       size in bytes of the EDID data
1037  * @phys_addr:  the new physical address
1038  *
1039  * This function finds the location of the physical address in the EDID
1040  * and fills in the given physical address and updates the checksum
1041  * at the end of the EDID block. It does nothing if the EDID doesn't
1042  * contain a physical address.
1043  */
1044 void v4l2_set_edid_phys_addr(u8 *edid, unsigned int size, u16 phys_addr)
1045 {
1046         unsigned int loc = cec_get_edid_spa_location(edid, size);
1047         u8 sum = 0;
1048         unsigned int i;
1049
1050         if (loc == 0)
1051                 return;
1052         edid[loc] = phys_addr >> 8;
1053         edid[loc + 1] = phys_addr & 0xff;
1054         loc &= ~0x7f;
1055
1056         /* update the checksum */
1057         for (i = loc; i < loc + 127; i++)
1058                 sum += edid[i];
1059         edid[i] = 256 - sum;
1060 }
1061 EXPORT_SYMBOL_GPL(v4l2_set_edid_phys_addr);
1062
1063 /**
1064  * v4l2_phys_addr_for_input() - calculate the PA for an input
1065  *
1066  * @phys_addr:  the physical address of the parent
1067  * @input:      the number of the input port, must be between 1 and 15
1068  *
1069  * This function calculates a new physical address based on the input
1070  * port number. For example:
1071  *
1072  * PA = 0.0.0.0 and input = 2 becomes 2.0.0.0
1073  *
1074  * PA = 3.0.0.0 and input = 1 becomes 3.1.0.0
1075  *
1076  * PA = 3.2.1.0 and input = 5 becomes 3.2.1.5
1077  *
1078  * PA = 3.2.1.3 and input = 5 becomes f.f.f.f since it maxed out the depth.
1079  *
1080  * Return: the new physical address or CEC_PHYS_ADDR_INVALID.
1081  */
1082 u16 v4l2_phys_addr_for_input(u16 phys_addr, u8 input)
1083 {
1084         /* Check if input is sane */
1085         if (WARN_ON(input == 0 || input > 0xf))
1086                 return CEC_PHYS_ADDR_INVALID;
1087
1088         if (phys_addr == 0)
1089                 return input << 12;
1090
1091         if ((phys_addr & 0x0fff) == 0)
1092                 return phys_addr | (input << 8);
1093
1094         if ((phys_addr & 0x00ff) == 0)
1095                 return phys_addr | (input << 4);
1096
1097         if ((phys_addr & 0x000f) == 0)
1098                 return phys_addr | input;
1099
1100         /*
1101          * All nibbles are used so no valid physical addresses can be assigned
1102          * to the input.
1103          */
1104         return CEC_PHYS_ADDR_INVALID;
1105 }
1106 EXPORT_SYMBOL_GPL(v4l2_phys_addr_for_input);
1107
1108 /**
1109  * v4l2_phys_addr_validate() - validate a physical address from an EDID
1110  *
1111  * @phys_addr:  the physical address to validate
1112  * @parent:     if not %NULL, then this is filled with the parents PA.
1113  * @port:       if not %NULL, then this is filled with the input port.
1114  *
1115  * This validates a physical address as read from an EDID. If the
1116  * PA is invalid (such as 1.0.1.0 since '0' is only allowed at the end),
1117  * then it will return -EINVAL.
1118  *
1119  * The parent PA is passed into %parent and the input port is passed into
1120  * %port. For example:
1121  *
1122  * PA = 0.0.0.0: has parent 0.0.0.0 and input port 0.
1123  *
1124  * PA = 1.0.0.0: has parent 0.0.0.0 and input port 1.
1125  *
1126  * PA = 3.2.0.0: has parent 3.0.0.0 and input port 2.
1127  *
1128  * PA = f.f.f.f: has parent f.f.f.f and input port 0.
1129  *
1130  * Return: 0 if the PA is valid, -EINVAL if not.
1131  */
1132 int v4l2_phys_addr_validate(u16 phys_addr, u16 *parent, u16 *port)
1133 {
1134         int i;
1135
1136         if (parent)
1137                 *parent = phys_addr;
1138         if (port)
1139                 *port = 0;
1140         if (phys_addr == CEC_PHYS_ADDR_INVALID)
1141                 return 0;
1142         for (i = 0; i < 16; i += 4)
1143                 if (phys_addr & (0xf << i))
1144                         break;
1145         if (i == 16)
1146                 return 0;
1147         if (parent)
1148                 *parent = phys_addr & (0xfff0 << i);
1149         if (port)
1150                 *port = (phys_addr >> i) & 0xf;
1151         for (i += 4; i < 16; i += 4)
1152                 if ((phys_addr & (0xf << i)) == 0)
1153                         return -EINVAL;
1154         return 0;
1155 }
1156 EXPORT_SYMBOL_GPL(v4l2_phys_addr_validate);