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  * @cap - the v4l2_dv_timings_cap capabilities.
 485  * @timings - the resulting timings.
 486  *
 487  * This function will attempt to detect if the given values correspond to a
 488  * valid CVT format. If so, then it will return true, and fmt will be filled
 489  * in with the found CVT timings.
 490  */
 491 bool v4l2_detect_cvt(unsigned int frame_height,
 492                      unsigned int hfreq,
 493                      unsigned int vsync,
 494                      unsigned int active_width,
 495                      u32 polarities,
 496                      bool interlaced,
 497                      const struct v4l2_dv_timings_cap *cap,
 498                      struct v4l2_dv_timings *timings)
 499 {
 500         struct v4l2_dv_timings t = {};
 501         int v_fp, v_bp, h_fp, h_bp, hsync;
 502         int frame_width, image_height, image_width;
 503         bool reduced_blanking;
 504         bool rb_v2 = false;
 505         unsigned int pix_clk;
 506
 507         if (vsync < 4 || vsync > 8)
 508                 return false;
 509
 510         if (polarities == V4L2_DV_VSYNC_POS_POL)
 511                 reduced_blanking = false;
 512         else if (polarities == V4L2_DV_HSYNC_POS_POL)
 513                 reduced_blanking = true;
 514         else
 515                 return false;
 516
 517         if (reduced_blanking && vsync == 8)
 518                 rb_v2 = true;
 519
 520         if (rb_v2 && active_width == 0)
 521                 return false;
 522
 523         if (!rb_v2 && vsync > 7)
 524                 return false;
 525
 526         if (hfreq == 0)
 527                 return false;
 528
 529         /* Vertical */
 530         if (reduced_blanking) {
 531                 if (rb_v2) {
 532                         v_bp = CVT_RB_V_BPORCH;
 533                         v_fp = (CVT_RB_MIN_V_BLANK * hfreq) / 1000000 + 1;
 534                         v_fp -= vsync + v_bp;
 535
 536                         if (v_fp < CVT_RB_V2_MIN_V_FPORCH)
 537                                 v_fp = CVT_RB_V2_MIN_V_FPORCH;
 538                 } else {
 539                         v_fp = CVT_RB_V_FPORCH;
 540                         v_bp = (CVT_RB_MIN_V_BLANK * hfreq) / 1000000 + 1;
 541                         v_bp -= vsync + v_fp;
 542
 543                         if (v_bp < CVT_RB_MIN_V_BPORCH)
 544                                 v_bp = CVT_RB_MIN_V_BPORCH;
 545                 }
 546         } else {
 547                 v_fp = CVT_MIN_V_PORCH_RND;
 548                 v_bp = (CVT_MIN_VSYNC_BP * hfreq) / 1000000 + 1 - vsync;
 549
 550                 if (v_bp < CVT_MIN_V_BPORCH)
 551                         v_bp = CVT_MIN_V_BPORCH;
 552         }
 553
 554         if (interlaced)
 555                 image_height = (frame_height - 2 * v_fp - 2 * vsync - 2 * v_bp) & ~0x1;
 556         else
 557                 image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
 558
 559         if (image_height < 0)
 560                 return false;
 561
 562         /* Aspect ratio based on vsync */
 563         switch (vsync) {
 564         case 4:
 565                 image_width = (image_height * 4) / 3;
 566                 break;
 567         case 5:
 568                 image_width = (image_height * 16) / 9;
 569                 break;
 570         case 6:
 571                 image_width = (image_height * 16) / 10;
 572                 break;
 573         case 7:
 574                 /* special case */
 575                 if (image_height == 1024)
 576                         image_width = (image_height * 5) / 4;
 577                 else if (image_height == 768)
 578                         image_width = (image_height * 15) / 9;
 579                 else
 580                         return false;
 581                 break;
 582         case 8:
 583                 image_width = active_width;
 584                 break;
 585         default:
 586                 return false;
 587         }
 588
 589         if (!rb_v2)
 590                 image_width = image_width & ~7;
 591
 592         /* Horizontal */
 593         if (reduced_blanking) {
 594                 int h_blank;
 595                 int clk_gran;
 596
 597                 h_blank = rb_v2 ? CVT_RB_V2_H_BLANK : CVT_RB_H_BLANK;
 598                 clk_gran = rb_v2 ? CVT_PXL_CLK_GRAN_RB_V2 : CVT_PXL_CLK_GRAN;
 599
 600                 pix_clk = (image_width + h_blank) * hfreq;
 601                 pix_clk = (pix_clk / clk_gran) * clk_gran;
 602
 603                 h_bp  = h_blank / 2;
 604                 hsync = CVT_RB_H_SYNC;
 605                 h_fp  = h_blank - h_bp - hsync;
 606
 607                 frame_width = image_width + h_blank;
 608         } else {
 609                 unsigned ideal_duty_cycle_per_myriad =
 610                         100 * CVT_C_PRIME - (CVT_M_PRIME * 100000) / hfreq;
 611                 int h_blank;
 612
 613                 if (ideal_duty_cycle_per_myriad < 2000)
 614                         ideal_duty_cycle_per_myriad = 2000;
 615
 616                 h_blank = image_width * ideal_duty_cycle_per_myriad /
 617                                         (10000 - ideal_duty_cycle_per_myriad);
 618                 h_blank = (h_blank / (2 * CVT_CELL_GRAN)) * 2 * CVT_CELL_GRAN;
 619
 620                 pix_clk = (image_width + h_blank) * hfreq;
 621                 pix_clk = (pix_clk / CVT_PXL_CLK_GRAN) * CVT_PXL_CLK_GRAN;
 622
 623                 h_bp = h_blank / 2;
 624                 frame_width = image_width + h_blank;
 625
 626                 hsync = frame_width * CVT_HSYNC_PERCENT / 100;
 627                 hsync = (hsync / CVT_CELL_GRAN) * CVT_CELL_GRAN;
 628                 h_fp = h_blank - hsync - h_bp;
 629         }
 630
 631         t.type = V4L2_DV_BT_656_1120;
 632         t.bt.polarities = polarities;
 633         t.bt.width = image_width;
 634         t.bt.height = image_height;
 635         t.bt.hfrontporch = h_fp;
 636         t.bt.vfrontporch = v_fp;
 637         t.bt.hsync = hsync;
 638         t.bt.vsync = vsync;
 639         t.bt.hbackporch = frame_width - image_width - h_fp - hsync;
 640
 641         if (!interlaced) {
 642                 t.bt.vbackporch = frame_height - image_height - v_fp - vsync;
 643                 t.bt.interlaced = V4L2_DV_PROGRESSIVE;
 644         } else {
 645                 t.bt.vbackporch = (frame_height - image_height - 2 * v_fp -
 646                                       2 * vsync) / 2;
 647                 t.bt.il_vbackporch = frame_height - image_height - 2 * v_fp -
 648                                         2 * vsync - t.bt.vbackporch;
 649                 t.bt.il_vfrontporch = v_fp;
 650                 t.bt.il_vsync = vsync;
 651                 t.bt.flags |= V4L2_DV_FL_HALF_LINE;
 652                 t.bt.interlaced = V4L2_DV_INTERLACED;
 653         }
 654
 655         t.bt.pixelclock = pix_clk;
 656         t.bt.standards = V4L2_DV_BT_STD_CVT;
 657
 658         if (reduced_blanking)
 659                 t.bt.flags |= V4L2_DV_FL_REDUCED_BLANKING;
 660
 661         if (!v4l2_valid_dv_timings(&t, cap, NULL, NULL))
 662                 return false;
 663         *timings = t;
 664         return true;
 665 }
 666 EXPORT_SYMBOL_GPL(v4l2_detect_cvt);
 667
 668 /*
 669  * GTF defines
 670  * Based on Generalized Timing Formula Standard
 671  * Version 1.1 September 2, 1999
 672  */
 673
 674 #define GTF_PXL_CLK_GRAN        250000  /* pixel clock granularity */
 675
 676 #define GTF_MIN_VSYNC_BP        550     /* min time of vsync + back porch (us) */
 677 #define GTF_V_FP                1       /* vertical front porch (lines) */
 678 #define GTF_CELL_GRAN           8       /* character cell granularity */
 679
 680 /* Default */
 681 #define GTF_D_M                 600     /* blanking formula gradient */
 682 #define GTF_D_C                 40      /* blanking formula offset */
 683 #define GTF_D_K                 128     /* blanking formula scaling factor */
 684 #define GTF_D_J                 20      /* blanking formula scaling factor */
 685 #define GTF_D_C_PRIME ((((GTF_D_C - GTF_D_J) * GTF_D_K) / 256) + GTF_D_J)
 686 #define GTF_D_M_PRIME ((GTF_D_K * GTF_D_M) / 256)
 687
 688 /* Secondary */
 689 #define GTF_S_M                 3600    /* blanking formula gradient */
 690 #define GTF_S_C                 40      /* blanking formula offset */
 691 #define GTF_S_K                 128     /* blanking formula scaling factor */
 692 #define GTF_S_J                 35      /* blanking formula scaling factor */
 693 #define GTF_S_C_PRIME ((((GTF_S_C - GTF_S_J) * GTF_S_K) / 256) + GTF_S_J)
 694 #define GTF_S_M_PRIME ((GTF_S_K * GTF_S_M) / 256)
 695
 696 /** v4l2_detect_gtf - detect if the given timings follow the GTF standard
 697  * @frame_height - the total height of the frame (including blanking) in lines.
 698  * @hfreq - the horizontal frequency in Hz.
 699  * @vsync - the height of the vertical sync in lines.
 700  * @polarities - the horizontal and vertical polarities (same as struct
 701  *              v4l2_bt_timings polarities).
 702  * @interlaced - if this flag is true, it indicates interlaced format
 703  * @aspect - preferred aspect ratio. GTF has no method of determining the
 704  *              aspect ratio in order to derive the image width from the
 705  *              image height, so it has to be passed explicitly. Usually
 706  *              the native screen aspect ratio is used for this. If it
 707  *              is not filled in correctly, then 16:9 will be assumed.
 708  * @cap - the v4l2_dv_timings_cap capabilities.
 709  * @timings - the resulting timings.
 710  *
 711  * This function will attempt to detect if the given values correspond to a
 712  * valid GTF format. If so, then it will return true, and fmt will be filled
 713  * in with the found GTF timings.
 714  */
 715 bool v4l2_detect_gtf(unsigned int frame_height,
 716                      unsigned int hfreq,
 717                      unsigned int vsync,
 718                      u32 polarities,
 719                      bool interlaced,
 720                      struct v4l2_fract aspect,
 721                      const struct v4l2_dv_timings_cap *cap,
 722                      struct v4l2_dv_timings *timings)
 723 {
 724         struct v4l2_dv_timings t = {};
 725         int pix_clk;
 726         int v_fp, v_bp, h_fp, hsync;
 727         int frame_width, image_height, image_width;
 728         bool default_gtf;
 729         int h_blank;
 730
 731         if (vsync != 3)
 732                 return false;
 733
 734         if (polarities == V4L2_DV_VSYNC_POS_POL)
 735                 default_gtf = true;
 736         else if (polarities == V4L2_DV_HSYNC_POS_POL)
 737                 default_gtf = false;
 738         else
 739                 return false;
 740
 741         if (hfreq == 0)
 742                 return false;
 743
 744         /* Vertical */
 745         v_fp = GTF_V_FP;
 746         v_bp = (GTF_MIN_VSYNC_BP * hfreq + 500000) / 1000000 - vsync;
 747         if (interlaced)
 748                 image_height = (frame_height - 2 * v_fp - 2 * vsync - 2 * v_bp) & ~0x1;
 749         else
 750                 image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
 751
 752         if (image_height < 0)
 753                 return false;
 754
 755         if (aspect.numerator == 0 || aspect.denominator == 0) {
 756                 aspect.numerator = 16;
 757                 aspect.denominator = 9;
 758         }
 759         image_width = ((image_height * aspect.numerator) / aspect.denominator);
 760         image_width = (image_width + GTF_CELL_GRAN/2) & ~(GTF_CELL_GRAN - 1);
 761
 762         /* Horizontal */
 763         if (default_gtf) {
 764                 u64 num;
 765                 u32 den;
 766
 767                 num = ((image_width * GTF_D_C_PRIME * (u64)hfreq) -
 768                       ((u64)image_width * GTF_D_M_PRIME * 1000));
 769                 den = (hfreq * (100 - GTF_D_C_PRIME) + GTF_D_M_PRIME * 1000) *
 770                       (2 * GTF_CELL_GRAN);
 771                 h_blank = div_u64((num + (den >> 1)), den);
 772                 h_blank *= (2 * GTF_CELL_GRAN);
 773         } else {
 774                 u64 num;
 775                 u32 den;
 776
 777                 num = ((image_width * GTF_S_C_PRIME * (u64)hfreq) -
 778                       ((u64)image_width * GTF_S_M_PRIME * 1000));
 779                 den = (hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000) *
 780                       (2 * GTF_CELL_GRAN);
 781                 h_blank = div_u64((num + (den >> 1)), den);
 782                 h_blank *= (2 * GTF_CELL_GRAN);
 783         }
 784
 785         frame_width = image_width + h_blank;
 786
 787         pix_clk = (image_width + h_blank) * hfreq;
 788         pix_clk = pix_clk / GTF_PXL_CLK_GRAN * GTF_PXL_CLK_GRAN;
 789
 790         hsync = (frame_width * 8 + 50) / 100;
 791         hsync = DIV_ROUND_CLOSEST(hsync, GTF_CELL_GRAN) * GTF_CELL_GRAN;
 792
 793         h_fp = h_blank / 2 - hsync;
 794
 795         t.type = V4L2_DV_BT_656_1120;
 796         t.bt.polarities = polarities;
 797         t.bt.width = image_width;
 798         t.bt.height = image_height;
 799         t.bt.hfrontporch = h_fp;
 800         t.bt.vfrontporch = v_fp;
 801         t.bt.hsync = hsync;
 802         t.bt.vsync = vsync;
 803         t.bt.hbackporch = frame_width - image_width - h_fp - hsync;
 804
 805         if (!interlaced) {
 806                 t.bt.vbackporch = frame_height - image_height - v_fp - vsync;
 807                 t.bt.interlaced = V4L2_DV_PROGRESSIVE;
 808         } else {
 809                 t.bt.vbackporch = (frame_height - image_height - 2 * v_fp -
 810                                       2 * vsync) / 2;
 811                 t.bt.il_vbackporch = frame_height - image_height - 2 * v_fp -
 812                                         2 * vsync - t.bt.vbackporch;
 813                 t.bt.il_vfrontporch = v_fp;
 814                 t.bt.il_vsync = vsync;
 815                 t.bt.flags |= V4L2_DV_FL_HALF_LINE;
 816                 t.bt.interlaced = V4L2_DV_INTERLACED;
 817         }
 818
 819         t.bt.pixelclock = pix_clk;
 820         t.bt.standards = V4L2_DV_BT_STD_GTF;
 821
 822         if (!default_gtf)
 823                 t.bt.flags |= V4L2_DV_FL_REDUCED_BLANKING;
 824
 825         if (!v4l2_valid_dv_timings(&t, cap, NULL, NULL))
 826                 return false;
 827         *timings = t;
 828         return true;
 829 }
 830 EXPORT_SYMBOL_GPL(v4l2_detect_gtf);
 831
 832 /** v4l2_calc_aspect_ratio - calculate the aspect ratio based on bytes
 833  *      0x15 and 0x16 from the EDID.
 834  * @hor_landscape - byte 0x15 from the EDID.
 835  * @vert_portrait - byte 0x16 from the EDID.
 836  *
 837  * Determines the aspect ratio from the EDID.
 838  * See VESA Enhanced EDID standard, release A, rev 2, section 3.6.2:
 839  * "Horizontal and Vertical Screen Size or Aspect Ratio"
 840  */
 841 struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait)
 842 {
 843         struct v4l2_fract aspect = { 16, 9 };
 844         u8 ratio;
 845
 846         /* Nothing filled in, fallback to 16:9 */
 847         if (!hor_landscape && !vert_portrait)
 848                 return aspect;
 849         /* Both filled in, so they are interpreted as the screen size in cm */
 850         if (hor_landscape && vert_portrait) {
 851                 aspect.numerator = hor_landscape;
 852                 aspect.denominator = vert_portrait;
 853                 return aspect;
 854         }
 855         /* Only one is filled in, so interpret them as a ratio:
 856            (val + 99) / 100 */
 857         ratio = hor_landscape | vert_portrait;
 858         /* Change some rounded values into the exact aspect ratio */
 859         if (ratio == 79) {
 860                 aspect.numerator = 16;
 861                 aspect.denominator = 9;
 862         } else if (ratio == 34) {
 863                 aspect.numerator = 4;
 864                 aspect.denominator = 3;
 865         } else if (ratio == 68) {
 866                 aspect.numerator = 15;
 867                 aspect.denominator = 9;
 868         } else {
 869                 aspect.numerator = hor_landscape + 99;
 870                 aspect.denominator = 100;
 871         }
 872         if (hor_landscape)
 873                 return aspect;
 874         /* The aspect ratio is for portrait, so swap numerator and denominator */
 875         swap(aspect.denominator, aspect.numerator);
 876         return aspect;
 877 }
 878 EXPORT_SYMBOL_GPL(v4l2_calc_aspect_ratio);
 879
 880 /** v4l2_hdmi_rx_colorimetry - determine HDMI colorimetry information
 881  *      based on various InfoFrames.
 882  * @avi: the AVI InfoFrame
 883  * @hdmi: the HDMI Vendor InfoFrame, may be NULL
 884  * @height: the frame height
 885  *
 886  * Determines the HDMI colorimetry information, i.e. how the HDMI
 887  * pixel color data should be interpreted.
 888  *
 889  * Note that some of the newer features (DCI-P3, HDR) are not yet
 890  * implemented: the hdmi.h header needs to be updated to the HDMI 2.0
 891  * and CTA-861-G standards.
 892  */
 893 struct v4l2_hdmi_colorimetry
 894 v4l2_hdmi_rx_colorimetry(const struct hdmi_avi_infoframe *avi,
 895                          const struct hdmi_vendor_infoframe *hdmi,
 896                          unsigned int height)
 897 {
 898         struct v4l2_hdmi_colorimetry c = {
 899                 V4L2_COLORSPACE_SRGB,
 900                 V4L2_YCBCR_ENC_DEFAULT,
 901                 V4L2_QUANTIZATION_FULL_RANGE,
 902                 V4L2_XFER_FUNC_SRGB
 903         };
 904         bool is_ce = avi->video_code || (hdmi && hdmi->vic);
 905         bool is_sdtv = height <= 576;
 906         bool default_is_lim_range_rgb = avi->video_code > 1;
 907
 908         switch (avi->colorspace) {
 909         case HDMI_COLORSPACE_RGB:
 910                 /* RGB pixel encoding */
 911                 switch (avi->colorimetry) {
 912                 case HDMI_COLORIMETRY_EXTENDED:
 913                         switch (avi->extended_colorimetry) {
 914                         case HDMI_EXTENDED_COLORIMETRY_OPRGB:
 915                                 c.colorspace = V4L2_COLORSPACE_OPRGB;
 916                                 c.xfer_func = V4L2_XFER_FUNC_OPRGB;
 917                                 break;
 918                         case HDMI_EXTENDED_COLORIMETRY_BT2020:
 919                                 c.colorspace = V4L2_COLORSPACE_BT2020;
 920                                 c.xfer_func = V4L2_XFER_FUNC_709;
 921                                 break;
 922                         default:
 923                                 break;
 924                         }
 925                         break;
 926                 default:
 927                         break;
 928                 }
 929                 switch (avi->quantization_range) {
 930                 case HDMI_QUANTIZATION_RANGE_LIMITED:
 931                         c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
 932                         break;
 933                 case HDMI_QUANTIZATION_RANGE_FULL:
 934                         break;
 935                 default:
 936                         if (default_is_lim_range_rgb)
 937                                 c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
 938                         break;
 939                 }
 940                 break;
 941
 942         default:
 943                 /* YCbCr pixel encoding */
 944                 c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
 945                 switch (avi->colorimetry) {
 946                 case HDMI_COLORIMETRY_NONE:
 947                         if (!is_ce)
 948                                 break;
 949                         if (is_sdtv) {
 950                                 c.colorspace = V4L2_COLORSPACE_SMPTE170M;
 951                                 c.ycbcr_enc = V4L2_YCBCR_ENC_601;
 952                         } else {
 953                                 c.colorspace = V4L2_COLORSPACE_REC709;
 954                                 c.ycbcr_enc = V4L2_YCBCR_ENC_709;
 955                         }
 956                         c.xfer_func = V4L2_XFER_FUNC_709;
 957                         break;
 958                 case HDMI_COLORIMETRY_ITU_601:
 959                         c.colorspace = V4L2_COLORSPACE_SMPTE170M;
 960                         c.ycbcr_enc = V4L2_YCBCR_ENC_601;
 961                         c.xfer_func = V4L2_XFER_FUNC_709;
 962                         break;
 963                 case HDMI_COLORIMETRY_ITU_709:
 964                         c.colorspace = V4L2_COLORSPACE_REC709;
 965                         c.ycbcr_enc = V4L2_YCBCR_ENC_709;
 966                         c.xfer_func = V4L2_XFER_FUNC_709;
 967                         break;
 968                 case HDMI_COLORIMETRY_EXTENDED:
 969                         switch (avi->extended_colorimetry) {
 970                         case HDMI_EXTENDED_COLORIMETRY_XV_YCC_601:
 971                                 c.colorspace = V4L2_COLORSPACE_REC709;
 972                                 c.ycbcr_enc = V4L2_YCBCR_ENC_XV709;
 973                                 c.xfer_func = V4L2_XFER_FUNC_709;
 974                                 break;
 975                         case HDMI_EXTENDED_COLORIMETRY_XV_YCC_709:
 976                                 c.colorspace = V4L2_COLORSPACE_REC709;
 977                                 c.ycbcr_enc = V4L2_YCBCR_ENC_XV601;
 978                                 c.xfer_func = V4L2_XFER_FUNC_709;
 979                                 break;
 980                         case HDMI_EXTENDED_COLORIMETRY_S_YCC_601:
 981                                 c.colorspace = V4L2_COLORSPACE_SRGB;
 982                                 c.ycbcr_enc = V4L2_YCBCR_ENC_601;
 983                                 c.xfer_func = V4L2_XFER_FUNC_SRGB;
 984                                 break;
 985                         case HDMI_EXTENDED_COLORIMETRY_OPYCC_601:
 986                                 c.colorspace = V4L2_COLORSPACE_OPRGB;
 987                                 c.ycbcr_enc = V4L2_YCBCR_ENC_601;
 988                                 c.xfer_func = V4L2_XFER_FUNC_OPRGB;
 989                                 break;
 990                         case HDMI_EXTENDED_COLORIMETRY_BT2020:
 991                                 c.colorspace = V4L2_COLORSPACE_BT2020;
 992                                 c.ycbcr_enc = V4L2_YCBCR_ENC_BT2020;
 993                                 c.xfer_func = V4L2_XFER_FUNC_709;
 994                                 break;
 995                         case HDMI_EXTENDED_COLORIMETRY_BT2020_CONST_LUM:
 996                                 c.colorspace = V4L2_COLORSPACE_BT2020;
 997                                 c.ycbcr_enc = V4L2_YCBCR_ENC_BT2020_CONST_LUM;
 998                                 c.xfer_func = V4L2_XFER_FUNC_709;
 999                                 break;
1000                         default: /* fall back to ITU_709 */
1001                                 c.colorspace = V4L2_COLORSPACE_REC709;
1002                                 c.ycbcr_enc = V4L2_YCBCR_ENC_709;
1003                                 c.xfer_func = V4L2_XFER_FUNC_709;
1004                                 break;
1005                         }
1006                         break;
1007                 default:
1008                         break;
1009                 }
1010                 /*
1011                  * YCC Quantization Range signaling is more-or-less broken,
1012                  * let's just ignore this.
1013                  */
1014                 break;
1015         }
1016         return c;
1017 }
1018 EXPORT_SYMBOL_GPL(v4l2_hdmi_rx_colorimetry);
1019
1020 /**
1021  * v4l2_get_edid_phys_addr() - find and return the physical address
1022  *
1023  * @edid:       pointer to the EDID data
1024  * @size:       size in bytes of the EDID data
1025  * @offset:     If not %NULL then the location of the physical address
1026  *              bytes in the EDID will be returned here. This is set to 0
1027  *              if there is no physical address found.
1028  *
1029  * Return: the physical address or CEC_PHYS_ADDR_INVALID if there is none.
1030  */
1031 u16 v4l2_get_edid_phys_addr(const u8 *edid, unsigned int size,
1032                             unsigned int *offset)
1033 {
1034         unsigned int loc = cec_get_edid_spa_location(edid, size);
1035
1036         if (offset)
1037                 *offset = loc;
1038         if (loc == 0)
1039                 return CEC_PHYS_ADDR_INVALID;
1040         return (edid[loc] << 8) | edid[loc + 1];
1041 }
1042 EXPORT_SYMBOL_GPL(v4l2_get_edid_phys_addr);
1043
1044 /**
1045  * v4l2_set_edid_phys_addr() - find and set the physical address
1046  *
1047  * @edid:       pointer to the EDID data
1048  * @size:       size in bytes of the EDID data
1049  * @phys_addr:  the new physical address
1050  *
1051  * This function finds the location of the physical address in the EDID
1052  * and fills in the given physical address and updates the checksum
1053  * at the end of the EDID block. It does nothing if the EDID doesn't
1054  * contain a physical address.
1055  */
1056 void v4l2_set_edid_phys_addr(u8 *edid, unsigned int size, u16 phys_addr)
1057 {
1058         unsigned int loc = cec_get_edid_spa_location(edid, size);
1059         u8 sum = 0;
1060         unsigned int i;
1061
1062         if (loc == 0)
1063                 return;
1064         edid[loc] = phys_addr >> 8;
1065         edid[loc + 1] = phys_addr & 0xff;
1066         loc &= ~0x7f;
1067
1068         /* update the checksum */
1069         for (i = loc; i < loc + 127; i++)
1070                 sum += edid[i];
1071         edid[i] = 256 - sum;
1072 }
1073 EXPORT_SYMBOL_GPL(v4l2_set_edid_phys_addr);
1074
1075 /**
1076  * v4l2_phys_addr_for_input() - calculate the PA for an input
1077  *
1078  * @phys_addr:  the physical address of the parent
1079  * @input:      the number of the input port, must be between 1 and 15
1080  *
1081  * This function calculates a new physical address based on the input
1082  * port number. For example:
1083  *
1084  * PA = 0.0.0.0 and input = 2 becomes 2.0.0.0
1085  *
1086  * PA = 3.0.0.0 and input = 1 becomes 3.1.0.0
1087  *
1088  * PA = 3.2.1.0 and input = 5 becomes 3.2.1.5
1089  *
1090  * PA = 3.2.1.3 and input = 5 becomes f.f.f.f since it maxed out the depth.
1091  *
1092  * Return: the new physical address or CEC_PHYS_ADDR_INVALID.
1093  */
1094 u16 v4l2_phys_addr_for_input(u16 phys_addr, u8 input)
1095 {
1096         /* Check if input is sane */
1097         if (WARN_ON(input == 0 || input > 0xf))
1098                 return CEC_PHYS_ADDR_INVALID;
1099
1100         if (phys_addr == 0)
1101                 return input << 12;
1102
1103         if ((phys_addr & 0x0fff) == 0)
1104                 return phys_addr | (input << 8);
1105
1106         if ((phys_addr & 0x00ff) == 0)
1107                 return phys_addr | (input << 4);
1108
1109         if ((phys_addr & 0x000f) == 0)
1110                 return phys_addr | input;
1111
1112         /*
1113          * All nibbles are used so no valid physical addresses can be assigned
1114          * to the input.
1115          */
1116         return CEC_PHYS_ADDR_INVALID;
1117 }
1118 EXPORT_SYMBOL_GPL(v4l2_phys_addr_for_input);
1119
1120 /**
1121  * v4l2_phys_addr_validate() - validate a physical address from an EDID
1122  *
1123  * @phys_addr:  the physical address to validate
1124  * @parent:     if not %NULL, then this is filled with the parents PA.
1125  * @port:       if not %NULL, then this is filled with the input port.
1126  *
1127  * This validates a physical address as read from an EDID. If the
1128  * PA is invalid (such as 1.0.1.0 since '0' is only allowed at the end),
1129  * then it will return -EINVAL.
1130  *
1131  * The parent PA is passed into %parent and the input port is passed into
1132  * %port. For example:
1133  *
1134  * PA = 0.0.0.0: has parent 0.0.0.0 and input port 0.
1135  *
1136  * PA = 1.0.0.0: has parent 0.0.0.0 and input port 1.
1137  *
1138  * PA = 3.2.0.0: has parent 3.0.0.0 and input port 2.
1139  *
1140  * PA = f.f.f.f: has parent f.f.f.f and input port 0.
1141  *
1142  * Return: 0 if the PA is valid, -EINVAL if not.
1143  */
1144 int v4l2_phys_addr_validate(u16 phys_addr, u16 *parent, u16 *port)
1145 {
1146         int i;
1147
1148         if (parent)
1149                 *parent = phys_addr;
1150         if (port)
1151                 *port = 0;
1152         if (phys_addr == CEC_PHYS_ADDR_INVALID)
1153                 return 0;
1154         for (i = 0; i < 16; i += 4)
1155                 if (phys_addr & (0xf << i))
1156                         break;
1157         if (i == 16)
1158                 return 0;
1159         if (parent)
1160                 *parent = phys_addr & (0xfff0 << i);
1161         if (port)
1162                 *port = (phys_addr >> i) & 0xf;
1163         for (i += 4; i < 16; i += 4)
1164                 if ((phys_addr & (0xf << i)) == 0)
1165                         return -EINVAL;
1166         return 0;
1167 }
1168 EXPORT_SYMBOL_GPL(v4l2_phys_addr_validate);
1169
1170 #ifdef CONFIG_DEBUG_FS
1171
1172 #define DEBUGFS_FOPS(type, flag)                                        \
1173 static ssize_t                                                          \
1174 infoframe_read_##type(struct file *filp,                                \
1175                       char __user *ubuf, size_t count, loff_t *ppos)    \
1176 {                                                                       \
1177         struct v4l2_debugfs_if *infoframes = filp->private_data;        \
1178                                                                         \
1179         return infoframes->if_read((flag), infoframes->priv, filp,      \
1180                                    ubuf, count, ppos);                  \
1181 }                                                                       \
1182                                                                         \
1183 static const struct file_operations infoframe_##type##_fops = {         \
1184         .owner   = THIS_MODULE,                                         \
1185         .open    = simple_open,                                         \
1186         .read    = infoframe_read_##type,                               \
1187 }
1188
1189 DEBUGFS_FOPS(avi, V4L2_DEBUGFS_IF_AVI);
1190 DEBUGFS_FOPS(audio, V4L2_DEBUGFS_IF_AUDIO);
1191 DEBUGFS_FOPS(spd, V4L2_DEBUGFS_IF_SPD);
1192 DEBUGFS_FOPS(hdmi, V4L2_DEBUGFS_IF_HDMI);
1193
1194 struct v4l2_debugfs_if *v4l2_debugfs_if_alloc(struct dentry *root, u32 if_types,
1195                                               void *priv,
1196                                               v4l2_debugfs_if_read_t if_read)
1197 {
1198         struct v4l2_debugfs_if *infoframes;
1199
1200         if (IS_ERR_OR_NULL(root) || !if_types || !if_read)
1201                 return NULL;
1202
1203         infoframes = kzalloc(sizeof(*infoframes), GFP_KERNEL);
1204         if (!infoframes)
1205                 return NULL;
1206
1207         infoframes->if_dir = debugfs_create_dir("infoframes", root);
1208         infoframes->priv = priv;
1209         infoframes->if_read = if_read;
1210         if (if_types & V4L2_DEBUGFS_IF_AVI)
1211                 debugfs_create_file("avi", 0400, infoframes->if_dir,
1212                                     infoframes, &infoframe_avi_fops);
1213         if (if_types & V4L2_DEBUGFS_IF_AUDIO)
1214                 debugfs_create_file("audio", 0400, infoframes->if_dir,
1215                                     infoframes, &infoframe_audio_fops);
1216         if (if_types & V4L2_DEBUGFS_IF_SPD)
1217                 debugfs_create_file("spd", 0400, infoframes->if_dir,
1218                                     infoframes, &infoframe_spd_fops);
1219         if (if_types & V4L2_DEBUGFS_IF_HDMI)
1220                 debugfs_create_file("hdmi", 0400, infoframes->if_dir,
1221                                     infoframes, &infoframe_hdmi_fops);
1222         return infoframes;
1223 }
1224 EXPORT_SYMBOL_GPL(v4l2_debugfs_if_alloc);
1225
1226 void v4l2_debugfs_if_free(struct v4l2_debugfs_if *infoframes)
1227 {
1228         if (infoframes) {
1229                 debugfs_remove_recursive(infoframes->if_dir);
1230                 kfree(infoframes);
1231         }
1232 }
1233 EXPORT_SYMBOL_GPL(v4l2_debugfs_if_free);
1234
1235 #endif