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
 149         if (t->type != V4L2_DV_BT_656_1120)
 150                 return false;
 151         if (t->type != dvcap->type ||
 152             bt->height < cap->min_height ||
 153             bt->height > cap->max_height ||
 154             bt->width < cap->min_width ||
 155             bt->width > cap->max_width ||
 156             bt->pixelclock < cap->min_pixelclock ||
 157             bt->pixelclock > cap->max_pixelclock ||
 158             (!(caps & V4L2_DV_BT_CAP_CUSTOM) &&
 159              cap->standards && bt->standards &&
 160              !(bt->standards & cap->standards)) ||
 161             (bt->interlaced && !(caps & V4L2_DV_BT_CAP_INTERLACED)) ||
 162             (!bt->interlaced && !(caps & V4L2_DV_BT_CAP_PROGRESSIVE)))
 163                 return false;
 164
 165         /* sanity checks for the blanking timings */
 166         if (!bt->interlaced &&
 167             (bt->il_vbackporch || bt->il_vsync || bt->il_vfrontporch))
 168                 return false;
 169         if (bt->hfrontporch > 2 * bt->width ||
 170             bt->hsync > 1024 || bt->hbackporch > 1024)
 171                 return false;
 172         if (bt->vfrontporch > 4096 ||
 173             bt->vsync > 128 || bt->vbackporch > 4096)
 174                 return false;
 175         if (bt->interlaced && (bt->il_vfrontporch > 4096 ||
 176             bt->il_vsync > 128 || bt->il_vbackporch > 4096))
 177                 return false;
 178         return fnc == NULL || fnc(t, fnc_handle);
 179 }
 180 EXPORT_SYMBOL_GPL(v4l2_valid_dv_timings);
 181
 182 int v4l2_enum_dv_timings_cap(struct v4l2_enum_dv_timings *t,
 183                              const struct v4l2_dv_timings_cap *cap,
 184                              v4l2_check_dv_timings_fnc fnc,
 185                              void *fnc_handle)
 186 {
 187         u32 i, idx;
 188
 189         memset(t->reserved, 0, sizeof(t->reserved));
 190         for (i = idx = 0; v4l2_dv_timings_presets[i].bt.width; i++) {
 191                 if (v4l2_valid_dv_timings(v4l2_dv_timings_presets + i, cap,
 192                                           fnc, fnc_handle) &&
 193                     idx++ == t->index) {
 194                         t->timings = v4l2_dv_timings_presets[i];
 195                         return 0;
 196                 }
 197         }
 198         return -EINVAL;
 199 }
 200 EXPORT_SYMBOL_GPL(v4l2_enum_dv_timings_cap);
 201
 202 bool v4l2_find_dv_timings_cap(struct v4l2_dv_timings *t,
 203                               const struct v4l2_dv_timings_cap *cap,
 204                               unsigned pclock_delta,
 205                               v4l2_check_dv_timings_fnc fnc,
 206                               void *fnc_handle)
 207 {
 208         int i;
 209
 210         if (!v4l2_valid_dv_timings(t, cap, fnc, fnc_handle))
 211                 return false;
 212
 213         for (i = 0; v4l2_dv_timings_presets[i].bt.width; i++) {
 214                 if (v4l2_valid_dv_timings(v4l2_dv_timings_presets + i, cap,
 215                                           fnc, fnc_handle) &&
 216                     v4l2_match_dv_timings(t, v4l2_dv_timings_presets + i,
 217                                           pclock_delta, false)) {
 218                         u32 flags = t->bt.flags & V4L2_DV_FL_REDUCED_FPS;
 219
 220                         *t = v4l2_dv_timings_presets[i];
 221                         if (can_reduce_fps(&t->bt))
 222                                 t->bt.flags |= flags;
 223
 224                         return true;
 225                 }
 226         }
 227         return false;
 228 }
 229 EXPORT_SYMBOL_GPL(v4l2_find_dv_timings_cap);
 230
 231 bool v4l2_find_dv_timings_cea861_vic(struct v4l2_dv_timings *t, u8 vic)
 232 {
 233         unsigned int i;
 234
 235         for (i = 0; v4l2_dv_timings_presets[i].bt.width; i++) {
 236                 const struct v4l2_bt_timings *bt =
 237                         &v4l2_dv_timings_presets[i].bt;
 238
 239                 if ((bt->flags & V4L2_DV_FL_HAS_CEA861_VIC) &&
 240                     bt->cea861_vic == vic) {
 241                         *t = v4l2_dv_timings_presets[i];
 242                         return true;
 243                 }
 244         }
 245         return false;
 246 }
 247 EXPORT_SYMBOL_GPL(v4l2_find_dv_timings_cea861_vic);
 248
 249 /**
 250  * v4l2_match_dv_timings - check if two timings match
 251  * @t1: compare this v4l2_dv_timings struct...
 252  * @t2: with this struct.
 253  * @pclock_delta: the allowed pixelclock deviation.
 254  * @match_reduced_fps: if true, then fail if V4L2_DV_FL_REDUCED_FPS does not
 255  *      match.
 256  *
 257  * Compare t1 with t2 with a given margin of error for the pixelclock.
 258  */
 259 bool v4l2_match_dv_timings(const struct v4l2_dv_timings *t1,
 260                            const struct v4l2_dv_timings *t2,
 261                            unsigned pclock_delta, bool match_reduced_fps)
 262 {
 263         if (t1->type != t2->type || t1->type != V4L2_DV_BT_656_1120)
 264                 return false;
 265         if (t1->bt.width == t2->bt.width &&
 266             t1->bt.height == t2->bt.height &&
 267             t1->bt.interlaced == t2->bt.interlaced &&
 268             t1->bt.polarities == t2->bt.polarities &&
 269             t1->bt.pixelclock >= t2->bt.pixelclock - pclock_delta &&
 270             t1->bt.pixelclock <= t2->bt.pixelclock + pclock_delta &&
 271             t1->bt.hfrontporch == t2->bt.hfrontporch &&
 272             t1->bt.hsync == t2->bt.hsync &&
 273             t1->bt.hbackporch == t2->bt.hbackporch &&
 274             t1->bt.vfrontporch == t2->bt.vfrontporch &&
 275             t1->bt.vsync == t2->bt.vsync &&
 276             t1->bt.vbackporch == t2->bt.vbackporch &&
 277             (!match_reduced_fps ||
 278              (t1->bt.flags & V4L2_DV_FL_REDUCED_FPS) ==
 279                 (t2->bt.flags & V4L2_DV_FL_REDUCED_FPS)) &&
 280             (!t1->bt.interlaced ||
 281                 (t1->bt.il_vfrontporch == t2->bt.il_vfrontporch &&
 282                  t1->bt.il_vsync == t2->bt.il_vsync &&
 283                  t1->bt.il_vbackporch == t2->bt.il_vbackporch)))
 284                 return true;
 285         return false;
 286 }
 287 EXPORT_SYMBOL_GPL(v4l2_match_dv_timings);
 288
 289 void v4l2_print_dv_timings(const char *dev_prefix, const char *prefix,
 290                            const struct v4l2_dv_timings *t, bool detailed)
 291 {
 292         const struct v4l2_bt_timings *bt = &t->bt;
 293         u32 htot, vtot;
 294         u32 fps;
 295
 296         if (t->type != V4L2_DV_BT_656_1120)
 297                 return;
 298
 299         htot = V4L2_DV_BT_FRAME_WIDTH(bt);
 300         vtot = V4L2_DV_BT_FRAME_HEIGHT(bt);
 301         if (bt->interlaced)
 302                 vtot /= 2;
 303
 304         fps = (htot * vtot) > 0 ? div_u64((100 * (u64)bt->pixelclock),
 305                                   (htot * vtot)) : 0;
 306
 307         if (prefix == NULL)
 308                 prefix = "";
 309
 310         pr_info("%s: %s%ux%u%s%u.%02u (%ux%u)\n", dev_prefix, prefix,
 311                 bt->width, bt->height, bt->interlaced ? "i" : "p",
 312                 fps / 100, fps % 100, htot, vtot);
 313
 314         if (!detailed)
 315                 return;
 316
 317         pr_info("%s: horizontal: fp = %u, %ssync = %u, bp = %u\n",
 318                         dev_prefix, bt->hfrontporch,
 319                         (bt->polarities & V4L2_DV_HSYNC_POS_POL) ? "+" : "-",
 320                         bt->hsync, bt->hbackporch);
 321         pr_info("%s: vertical: fp = %u, %ssync = %u, bp = %u\n",
 322                         dev_prefix, bt->vfrontporch,
 323                         (bt->polarities & V4L2_DV_VSYNC_POS_POL) ? "+" : "-",
 324                         bt->vsync, bt->vbackporch);
 325         if (bt->interlaced)
 326                 pr_info("%s: vertical bottom field: fp = %u, %ssync = %u, bp = %u\n",
 327                         dev_prefix, bt->il_vfrontporch,
 328                         (bt->polarities & V4L2_DV_VSYNC_POS_POL) ? "+" : "-",
 329                         bt->il_vsync, bt->il_vbackporch);
 330         pr_info("%s: pixelclock: %llu\n", dev_prefix, bt->pixelclock);
 331         pr_info("%s: flags (0x%x):%s%s%s%s%s%s%s%s%s%s\n",
 332                         dev_prefix, bt->flags,
 333                         (bt->flags & V4L2_DV_FL_REDUCED_BLANKING) ?
 334                         " REDUCED_BLANKING" : "",
 335                         ((bt->flags & V4L2_DV_FL_REDUCED_BLANKING) &&
 336                          bt->vsync == 8) ? " (V2)" : "",
 337                         (bt->flags & V4L2_DV_FL_CAN_REDUCE_FPS) ?
 338                         " CAN_REDUCE_FPS" : "",
 339                         (bt->flags & V4L2_DV_FL_REDUCED_FPS) ?
 340                         " REDUCED_FPS" : "",
 341                         (bt->flags & V4L2_DV_FL_HALF_LINE) ?
 342                         " HALF_LINE" : "",
 343                         (bt->flags & V4L2_DV_FL_IS_CE_VIDEO) ?
 344                         " CE_VIDEO" : "",
 345                         (bt->flags & V4L2_DV_FL_FIRST_FIELD_EXTRA_LINE) ?
 346                         " FIRST_FIELD_EXTRA_LINE" : "",
 347                         (bt->flags & V4L2_DV_FL_HAS_PICTURE_ASPECT) ?
 348                         " HAS_PICTURE_ASPECT" : "",
 349                         (bt->flags & V4L2_DV_FL_HAS_CEA861_VIC) ?
 350                         " HAS_CEA861_VIC" : "",
 351                         (bt->flags & V4L2_DV_FL_HAS_HDMI_VIC) ?
 352                         " HAS_HDMI_VIC" : "");
 353         pr_info("%s: standards (0x%x):%s%s%s%s%s\n", dev_prefix, bt->standards,
 354                         (bt->standards & V4L2_DV_BT_STD_CEA861) ?  " CEA" : "",
 355                         (bt->standards & V4L2_DV_BT_STD_DMT) ?  " DMT" : "",
 356                         (bt->standards & V4L2_DV_BT_STD_CVT) ?  " CVT" : "",
 357                         (bt->standards & V4L2_DV_BT_STD_GTF) ?  " GTF" : "",
 358                         (bt->standards & V4L2_DV_BT_STD_SDI) ?  " SDI" : "");
 359         if (bt->flags & V4L2_DV_FL_HAS_PICTURE_ASPECT)
 360                 pr_info("%s: picture aspect (hor:vert): %u:%u\n", dev_prefix,
 361                         bt->picture_aspect.numerator,
 362                         bt->picture_aspect.denominator);
 363         if (bt->flags & V4L2_DV_FL_HAS_CEA861_VIC)
 364                 pr_info("%s: CEA-861 VIC: %u\n", dev_prefix, bt->cea861_vic);
 365         if (bt->flags & V4L2_DV_FL_HAS_HDMI_VIC)
 366                 pr_info("%s: HDMI VIC: %u\n", dev_prefix, bt->hdmi_vic);
 367 }
 368 EXPORT_SYMBOL_GPL(v4l2_print_dv_timings);
 369
 370 struct v4l2_fract v4l2_dv_timings_aspect_ratio(const struct v4l2_dv_timings *t)
 371 {
 372         struct v4l2_fract ratio = { 1, 1 };
 373         unsigned long n, d;
 374
 375         if (t->type != V4L2_DV_BT_656_1120)
 376                 return ratio;
 377         if (!(t->bt.flags & V4L2_DV_FL_HAS_PICTURE_ASPECT))
 378                 return ratio;
 379
 380         ratio.numerator = t->bt.width * t->bt.picture_aspect.denominator;
 381         ratio.denominator = t->bt.height * t->bt.picture_aspect.numerator;
 382
 383         rational_best_approximation(ratio.numerator, ratio.denominator,
 384                                     ratio.numerator, ratio.denominator, &n, &d);
 385         ratio.numerator = n;
 386         ratio.denominator = d;
 387         return ratio;
 388 }
 389 EXPORT_SYMBOL_GPL(v4l2_dv_timings_aspect_ratio);
 390
 391 /** v4l2_calc_timeperframe - helper function to calculate timeperframe based
 392  *      v4l2_dv_timings fields.
 393  * @t - Timings for the video mode.
 394  *
 395  * Calculates the expected timeperframe using the pixel clock value and
 396  * horizontal/vertical measures. This means that v4l2_dv_timings structure
 397  * must be correctly and fully filled.
 398  */
 399 struct v4l2_fract v4l2_calc_timeperframe(const struct v4l2_dv_timings *t)
 400 {
 401         const struct v4l2_bt_timings *bt = &t->bt;
 402         struct v4l2_fract fps_fract = { 1, 1 };
 403         unsigned long n, d;
 404         u32 htot, vtot, fps;
 405         u64 pclk;
 406
 407         if (t->type != V4L2_DV_BT_656_1120)
 408                 return fps_fract;
 409
 410         htot = V4L2_DV_BT_FRAME_WIDTH(bt);
 411         vtot = V4L2_DV_BT_FRAME_HEIGHT(bt);
 412         pclk = bt->pixelclock;
 413
 414         if ((bt->flags & V4L2_DV_FL_CAN_DETECT_REDUCED_FPS) &&
 415             (bt->flags & V4L2_DV_FL_REDUCED_FPS))
 416                 pclk = div_u64(pclk * 1000ULL, 1001);
 417
 418         fps = (htot * vtot) > 0 ? div_u64((100 * pclk), (htot * vtot)) : 0;
 419         if (!fps)
 420                 return fps_fract;
 421
 422         rational_best_approximation(fps, 100, fps, 100, &n, &d);
 423
 424         fps_fract.numerator = d;
 425         fps_fract.denominator = n;
 426         return fps_fract;
 427 }
 428 EXPORT_SYMBOL_GPL(v4l2_calc_timeperframe);
 429
 430 /*
 431  * CVT defines
 432  * Based on Coordinated Video Timings Standard
 433  * version 1.1 September 10, 2003
 434  */
 435
 436 #define CVT_PXL_CLK_GRAN        250000  /* pixel clock granularity */
 437 #define CVT_PXL_CLK_GRAN_RB_V2 1000     /* granularity for reduced blanking v2*/
 438
 439 /* Normal blanking */
 440 #define CVT_MIN_V_BPORCH        7       /* lines */
 441 #define CVT_MIN_V_PORCH_RND     3       /* lines */
 442 #define CVT_MIN_VSYNC_BP        550     /* min time of vsync + back porch (us) */
 443 #define CVT_HSYNC_PERCENT       8       /* nominal hsync as percentage of line */
 444
 445 /* Normal blanking for CVT uses GTF to calculate horizontal blanking */
 446 #define CVT_CELL_GRAN           8       /* character cell granularity */
 447 #define CVT_M                   600     /* blanking formula gradient */
 448 #define CVT_C                   40      /* blanking formula offset */
 449 #define CVT_K                   128     /* blanking formula scaling factor */
 450 #define CVT_J                   20      /* blanking formula scaling factor */
 451 #define CVT_C_PRIME (((CVT_C - CVT_J) * CVT_K / 256) + CVT_J)
 452 #define CVT_M_PRIME (CVT_K * CVT_M / 256)
 453
 454 /* Reduced Blanking */
 455 #define CVT_RB_MIN_V_BPORCH    7       /* lines  */
 456 #define CVT_RB_V_FPORCH        3       /* lines  */
 457 #define CVT_RB_MIN_V_BLANK   460       /* us     */
 458 #define CVT_RB_H_SYNC         32       /* pixels */
 459 #define CVT_RB_H_BLANK       160       /* pixels */
 460 /* Reduce blanking Version 2 */
 461 #define CVT_RB_V2_H_BLANK     80       /* pixels */
 462 #define CVT_RB_MIN_V_FPORCH    3       /* lines  */
 463 #define CVT_RB_V2_MIN_V_FPORCH 1       /* lines  */
 464 #define CVT_RB_V_BPORCH        6       /* lines  */
 465
 466 /** v4l2_detect_cvt - detect if the given timings follow the CVT standard
 467  * @frame_height - the total height of the frame (including blanking) in lines.
 468  * @hfreq - the horizontal frequency in Hz.
 469  * @vsync - the height of the vertical sync in lines.
 470  * @active_width - active width of image (does not include blanking). This
 471  * information is needed only in case of version 2 of reduced blanking.
 472  * In other cases, this parameter does not have any effect on timings.
 473  * @polarities - the horizontal and vertical polarities (same as struct
 474  *              v4l2_bt_timings polarities).
 475  * @interlaced - if this flag is true, it indicates interlaced format
 476  * @fmt - the resulting timings.
 477  *
 478  * This function will attempt to detect if the given values correspond to a
 479  * valid CVT format. If so, then it will return true, and fmt will be filled
 480  * in with the found CVT timings.
 481  */
 482 bool v4l2_detect_cvt(unsigned frame_height,
 483                      unsigned hfreq,
 484                      unsigned vsync,
 485                      unsigned active_width,
 486                      u32 polarities,
 487                      bool interlaced,
 488                      struct v4l2_dv_timings *fmt)
 489 {
 490         int  v_fp, v_bp, h_fp, h_bp, hsync;
 491         int  frame_width, image_height, image_width;
 492         bool reduced_blanking;
 493         bool rb_v2 = false;
 494         unsigned pix_clk;
 495
 496         if (vsync < 4 || vsync > 8)
 497                 return false;
 498
 499         if (polarities == V4L2_DV_VSYNC_POS_POL)
 500                 reduced_blanking = false;
 501         else if (polarities == V4L2_DV_HSYNC_POS_POL)
 502                 reduced_blanking = true;
 503         else
 504                 return false;
 505
 506         if (reduced_blanking && vsync == 8)
 507                 rb_v2 = true;
 508
 509         if (rb_v2 && active_width == 0)
 510                 return false;
 511
 512         if (!rb_v2 && vsync > 7)
 513                 return false;
 514
 515         if (hfreq == 0)
 516                 return false;
 517
 518         /* Vertical */
 519         if (reduced_blanking) {
 520                 if (rb_v2) {
 521                         v_bp = CVT_RB_V_BPORCH;
 522                         v_fp = (CVT_RB_MIN_V_BLANK * hfreq) / 1000000 + 1;
 523                         v_fp -= vsync + v_bp;
 524
 525                         if (v_fp < CVT_RB_V2_MIN_V_FPORCH)
 526                                 v_fp = CVT_RB_V2_MIN_V_FPORCH;
 527                 } else {
 528                         v_fp = CVT_RB_V_FPORCH;
 529                         v_bp = (CVT_RB_MIN_V_BLANK * hfreq) / 1000000 + 1;
 530                         v_bp -= vsync + v_fp;
 531
 532                         if (v_bp < CVT_RB_MIN_V_BPORCH)
 533                                 v_bp = CVT_RB_MIN_V_BPORCH;
 534                 }
 535         } else {
 536                 v_fp = CVT_MIN_V_PORCH_RND;
 537                 v_bp = (CVT_MIN_VSYNC_BP * hfreq) / 1000000 + 1 - vsync;
 538
 539                 if (v_bp < CVT_MIN_V_BPORCH)
 540                         v_bp = CVT_MIN_V_BPORCH;
 541         }
 542
 543         if (interlaced)
 544                 image_height = (frame_height - 2 * v_fp - 2 * vsync - 2 * v_bp) & ~0x1;
 545         else
 546                 image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
 547
 548         if (image_height < 0)
 549                 return false;
 550
 551         /* Aspect ratio based on vsync */
 552         switch (vsync) {
 553         case 4:
 554                 image_width = (image_height * 4) / 3;
 555                 break;
 556         case 5:
 557                 image_width = (image_height * 16) / 9;
 558                 break;
 559         case 6:
 560                 image_width = (image_height * 16) / 10;
 561                 break;
 562         case 7:
 563                 /* special case */
 564                 if (image_height == 1024)
 565                         image_width = (image_height * 5) / 4;
 566                 else if (image_height == 768)
 567                         image_width = (image_height * 15) / 9;
 568                 else
 569                         return false;
 570                 break;
 571         case 8:
 572                 image_width = active_width;
 573                 break;
 574         default:
 575                 return false;
 576         }
 577
 578         if (!rb_v2)
 579                 image_width = image_width & ~7;
 580
 581         /* Horizontal */
 582         if (reduced_blanking) {
 583                 int h_blank;
 584                 int clk_gran;
 585
 586                 h_blank = rb_v2 ? CVT_RB_V2_H_BLANK : CVT_RB_H_BLANK;
 587                 clk_gran = rb_v2 ? CVT_PXL_CLK_GRAN_RB_V2 : CVT_PXL_CLK_GRAN;
 588
 589                 pix_clk = (image_width + h_blank) * hfreq;
 590                 pix_clk = (pix_clk / clk_gran) * clk_gran;
 591
 592                 h_bp  = h_blank / 2;
 593                 hsync = CVT_RB_H_SYNC;
 594                 h_fp  = h_blank - h_bp - hsync;
 595
 596                 frame_width = image_width + h_blank;
 597         } else {
 598                 unsigned ideal_duty_cycle_per_myriad =
 599                         100 * CVT_C_PRIME - (CVT_M_PRIME * 100000) / hfreq;
 600                 int h_blank;
 601
 602                 if (ideal_duty_cycle_per_myriad < 2000)
 603                         ideal_duty_cycle_per_myriad = 2000;
 604
 605                 h_blank = image_width * ideal_duty_cycle_per_myriad /
 606                                         (10000 - ideal_duty_cycle_per_myriad);
 607                 h_blank = (h_blank / (2 * CVT_CELL_GRAN)) * 2 * CVT_CELL_GRAN;
 608
 609                 pix_clk = (image_width + h_blank) * hfreq;
 610                 pix_clk = (pix_clk / CVT_PXL_CLK_GRAN) * CVT_PXL_CLK_GRAN;
 611
 612                 h_bp = h_blank / 2;
 613                 frame_width = image_width + h_blank;
 614
 615                 hsync = frame_width * CVT_HSYNC_PERCENT / 100;
 616                 hsync = (hsync / CVT_CELL_GRAN) * CVT_CELL_GRAN;
 617                 h_fp = h_blank - hsync - h_bp;
 618         }
 619
 620         fmt->type = V4L2_DV_BT_656_1120;
 621         fmt->bt.polarities = polarities;
 622         fmt->bt.width = image_width;
 623         fmt->bt.height = image_height;
 624         fmt->bt.hfrontporch = h_fp;
 625         fmt->bt.vfrontporch = v_fp;
 626         fmt->bt.hsync = hsync;
 627         fmt->bt.vsync = vsync;
 628         fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync;
 629
 630         if (!interlaced) {
 631                 fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync;
 632                 fmt->bt.interlaced = V4L2_DV_PROGRESSIVE;
 633         } else {
 634                 fmt->bt.vbackporch = (frame_height - image_height - 2 * v_fp -
 635                                       2 * vsync) / 2;
 636                 fmt->bt.il_vbackporch = frame_height - image_height - 2 * v_fp -
 637                                         2 * vsync - fmt->bt.vbackporch;
 638                 fmt->bt.il_vfrontporch = v_fp;
 639                 fmt->bt.il_vsync = vsync;
 640                 fmt->bt.flags |= V4L2_DV_FL_HALF_LINE;
 641                 fmt->bt.interlaced = V4L2_DV_INTERLACED;
 642         }
 643
 644         fmt->bt.pixelclock = pix_clk;
 645         fmt->bt.standards = V4L2_DV_BT_STD_CVT;
 646
 647         if (reduced_blanking)
 648                 fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING;
 649
 650         return true;
 651 }
 652 EXPORT_SYMBOL_GPL(v4l2_detect_cvt);
 653
 654 /*
 655  * GTF defines
 656  * Based on Generalized Timing Formula Standard
 657  * Version 1.1 September 2, 1999
 658  */
 659
 660 #define GTF_PXL_CLK_GRAN        250000  /* pixel clock granularity */
 661
 662 #define GTF_MIN_VSYNC_BP        550     /* min time of vsync + back porch (us) */
 663 #define GTF_V_FP                1       /* vertical front porch (lines) */
 664 #define GTF_CELL_GRAN           8       /* character cell granularity */
 665
 666 /* Default */
 667 #define GTF_D_M                 600     /* blanking formula gradient */
 668 #define GTF_D_C                 40      /* blanking formula offset */
 669 #define GTF_D_K                 128     /* blanking formula scaling factor */
 670 #define GTF_D_J                 20      /* blanking formula scaling factor */
 671 #define GTF_D_C_PRIME ((((GTF_D_C - GTF_D_J) * GTF_D_K) / 256) + GTF_D_J)
 672 #define GTF_D_M_PRIME ((GTF_D_K * GTF_D_M) / 256)
 673
 674 /* Secondary */
 675 #define GTF_S_M                 3600    /* blanking formula gradient */
 676 #define GTF_S_C                 40      /* blanking formula offset */
 677 #define GTF_S_K                 128     /* blanking formula scaling factor */
 678 #define GTF_S_J                 35      /* blanking formula scaling factor */
 679 #define GTF_S_C_PRIME ((((GTF_S_C - GTF_S_J) * GTF_S_K) / 256) + GTF_S_J)
 680 #define GTF_S_M_PRIME ((GTF_S_K * GTF_S_M) / 256)
 681
 682 /** v4l2_detect_gtf - detect if the given timings follow the GTF standard
 683  * @frame_height - the total height of the frame (including blanking) in lines.
 684  * @hfreq - the horizontal frequency in Hz.
 685  * @vsync - the height of the vertical sync in lines.
 686  * @polarities - the horizontal and vertical polarities (same as struct
 687  *              v4l2_bt_timings polarities).
 688  * @interlaced - if this flag is true, it indicates interlaced format
 689  * @aspect - preferred aspect ratio. GTF has no method of determining the
 690  *              aspect ratio in order to derive the image width from the
 691  *              image height, so it has to be passed explicitly. Usually
 692  *              the native screen aspect ratio is used for this. If it
 693  *              is not filled in correctly, then 16:9 will be assumed.
 694  * @fmt - the resulting timings.
 695  *
 696  * This function will attempt to detect if the given values correspond to a
 697  * valid GTF format. If so, then it will return true, and fmt will be filled
 698  * in with the found GTF timings.
 699  */
 700 bool v4l2_detect_gtf(unsigned frame_height,
 701                 unsigned hfreq,
 702                 unsigned vsync,
 703                 u32 polarities,
 704                 bool interlaced,
 705                 struct v4l2_fract aspect,
 706                 struct v4l2_dv_timings *fmt)
 707 {
 708         int pix_clk;
 709         int  v_fp, v_bp, h_fp, hsync;
 710         int frame_width, image_height, image_width;
 711         bool default_gtf;
 712         int h_blank;
 713
 714         if (vsync != 3)
 715                 return false;
 716
 717         if (polarities == V4L2_DV_VSYNC_POS_POL)
 718                 default_gtf = true;
 719         else if (polarities == V4L2_DV_HSYNC_POS_POL)
 720                 default_gtf = false;
 721         else
 722                 return false;
 723
 724         if (hfreq == 0)
 725                 return false;
 726
 727         /* Vertical */
 728         v_fp = GTF_V_FP;
 729         v_bp = (GTF_MIN_VSYNC_BP * hfreq + 500000) / 1000000 - vsync;
 730         if (interlaced)
 731                 image_height = (frame_height - 2 * v_fp - 2 * vsync - 2 * v_bp) & ~0x1;
 732         else
 733                 image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
 734
 735         if (image_height < 0)
 736                 return false;
 737
 738         if (aspect.numerator == 0 || aspect.denominator == 0) {
 739                 aspect.numerator = 16;
 740                 aspect.denominator = 9;
 741         }
 742         image_width = ((image_height * aspect.numerator) / aspect.denominator);
 743         image_width = (image_width + GTF_CELL_GRAN/2) & ~(GTF_CELL_GRAN - 1);
 744
 745         /* Horizontal */
 746         if (default_gtf) {
 747                 u64 num;
 748                 u32 den;
 749
 750                 num = ((image_width * GTF_D_C_PRIME * (u64)hfreq) -
 751                       ((u64)image_width * GTF_D_M_PRIME * 1000));
 752                 den = (hfreq * (100 - GTF_D_C_PRIME) + GTF_D_M_PRIME * 1000) *
 753                       (2 * GTF_CELL_GRAN);
 754                 h_blank = div_u64((num + (den >> 1)), den);
 755                 h_blank *= (2 * GTF_CELL_GRAN);
 756         } else {
 757                 u64 num;
 758                 u32 den;
 759
 760                 num = ((image_width * GTF_S_C_PRIME * (u64)hfreq) -
 761                       ((u64)image_width * GTF_S_M_PRIME * 1000));
 762                 den = (hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000) *
 763                       (2 * GTF_CELL_GRAN);
 764                 h_blank = div_u64((num + (den >> 1)), den);
 765                 h_blank *= (2 * GTF_CELL_GRAN);
 766         }
 767
 768         frame_width = image_width + h_blank;
 769
 770         pix_clk = (image_width + h_blank) * hfreq;
 771         pix_clk = pix_clk / GTF_PXL_CLK_GRAN * GTF_PXL_CLK_GRAN;
 772
 773         hsync = (frame_width * 8 + 50) / 100;
 774         hsync = DIV_ROUND_CLOSEST(hsync, GTF_CELL_GRAN) * GTF_CELL_GRAN;
 775
 776         h_fp = h_blank / 2 - hsync;
 777
 778         fmt->type = V4L2_DV_BT_656_1120;
 779         fmt->bt.polarities = polarities;
 780         fmt->bt.width = image_width;
 781         fmt->bt.height = image_height;
 782         fmt->bt.hfrontporch = h_fp;
 783         fmt->bt.vfrontporch = v_fp;
 784         fmt->bt.hsync = hsync;
 785         fmt->bt.vsync = vsync;
 786         fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync;
 787
 788         if (!interlaced) {
 789                 fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync;
 790                 fmt->bt.interlaced = V4L2_DV_PROGRESSIVE;
 791         } else {
 792                 fmt->bt.vbackporch = (frame_height - image_height - 2 * v_fp -
 793                                       2 * vsync) / 2;
 794                 fmt->bt.il_vbackporch = frame_height - image_height - 2 * v_fp -
 795                                         2 * vsync - fmt->bt.vbackporch;
 796                 fmt->bt.il_vfrontporch = v_fp;
 797                 fmt->bt.il_vsync = vsync;
 798                 fmt->bt.flags |= V4L2_DV_FL_HALF_LINE;
 799                 fmt->bt.interlaced = V4L2_DV_INTERLACED;
 800         }
 801
 802         fmt->bt.pixelclock = pix_clk;
 803         fmt->bt.standards = V4L2_DV_BT_STD_GTF;
 804
 805         if (!default_gtf)
 806                 fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING;
 807
 808         return true;
 809 }
 810 EXPORT_SYMBOL_GPL(v4l2_detect_gtf);
 811
 812 /** v4l2_calc_aspect_ratio - calculate the aspect ratio based on bytes
 813  *      0x15 and 0x16 from the EDID.
 814  * @hor_landscape - byte 0x15 from the EDID.
 815  * @vert_portrait - byte 0x16 from the EDID.
 816  *
 817  * Determines the aspect ratio from the EDID.
 818  * See VESA Enhanced EDID standard, release A, rev 2, section 3.6.2:
 819  * "Horizontal and Vertical Screen Size or Aspect Ratio"
 820  */
 821 struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait)
 822 {
 823         struct v4l2_fract aspect = { 16, 9 };
 824         u8 ratio;
 825
 826         /* Nothing filled in, fallback to 16:9 */
 827         if (!hor_landscape && !vert_portrait)
 828                 return aspect;
 829         /* Both filled in, so they are interpreted as the screen size in cm */
 830         if (hor_landscape && vert_portrait) {
 831                 aspect.numerator = hor_landscape;
 832                 aspect.denominator = vert_portrait;
 833                 return aspect;
 834         }
 835         /* Only one is filled in, so interpret them as a ratio:
 836            (val + 99) / 100 */
 837         ratio = hor_landscape | vert_portrait;
 838         /* Change some rounded values into the exact aspect ratio */
 839         if (ratio == 79) {
 840                 aspect.numerator = 16;
 841                 aspect.denominator = 9;
 842         } else if (ratio == 34) {
 843                 aspect.numerator = 4;
 844                 aspect.denominator = 3;
 845         } else if (ratio == 68) {
 846                 aspect.numerator = 15;
 847                 aspect.denominator = 9;
 848         } else {
 849                 aspect.numerator = hor_landscape + 99;
 850                 aspect.denominator = 100;
 851         }
 852         if (hor_landscape)
 853                 return aspect;
 854         /* The aspect ratio is for portrait, so swap numerator and denominator */
 855         swap(aspect.denominator, aspect.numerator);
 856         return aspect;
 857 }
 858 EXPORT_SYMBOL_GPL(v4l2_calc_aspect_ratio);
 859
 860 /** v4l2_hdmi_rx_colorimetry - determine HDMI colorimetry information
 861  *      based on various InfoFrames.
 862  * @avi: the AVI InfoFrame
 863  * @hdmi: the HDMI Vendor InfoFrame, may be NULL
 864  * @height: the frame height
 865  *
 866  * Determines the HDMI colorimetry information, i.e. how the HDMI
 867  * pixel color data should be interpreted.
 868  *
 869  * Note that some of the newer features (DCI-P3, HDR) are not yet
 870  * implemented: the hdmi.h header needs to be updated to the HDMI 2.0
 871  * and CTA-861-G standards.
 872  */
 873 struct v4l2_hdmi_colorimetry
 874 v4l2_hdmi_rx_colorimetry(const struct hdmi_avi_infoframe *avi,
 875                          const struct hdmi_vendor_infoframe *hdmi,
 876                          unsigned int height)
 877 {
 878         struct v4l2_hdmi_colorimetry c = {
 879                 V4L2_COLORSPACE_SRGB,
 880                 V4L2_YCBCR_ENC_DEFAULT,
 881                 V4L2_QUANTIZATION_FULL_RANGE,
 882                 V4L2_XFER_FUNC_SRGB
 883         };
 884         bool is_ce = avi->video_code || (hdmi && hdmi->vic);
 885         bool is_sdtv = height <= 576;
 886         bool default_is_lim_range_rgb = avi->video_code > 1;
 887
 888         switch (avi->colorspace) {
 889         case HDMI_COLORSPACE_RGB:
 890                 /* RGB pixel encoding */
 891                 switch (avi->colorimetry) {
 892                 case HDMI_COLORIMETRY_EXTENDED:
 893                         switch (avi->extended_colorimetry) {
 894                         case HDMI_EXTENDED_COLORIMETRY_OPRGB:
 895                                 c.colorspace = V4L2_COLORSPACE_OPRGB;
 896                                 c.xfer_func = V4L2_XFER_FUNC_OPRGB;
 897                                 break;
 898                         case HDMI_EXTENDED_COLORIMETRY_BT2020:
 899                                 c.colorspace = V4L2_COLORSPACE_BT2020;
 900                                 c.xfer_func = V4L2_XFER_FUNC_709;
 901                                 break;
 902                         default:
 903                                 break;
 904                         }
 905                         break;
 906                 default:
 907                         break;
 908                 }
 909                 switch (avi->quantization_range) {
 910                 case HDMI_QUANTIZATION_RANGE_LIMITED:
 911                         c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
 912                         break;
 913                 case HDMI_QUANTIZATION_RANGE_FULL:
 914                         break;
 915                 default:
 916                         if (default_is_lim_range_rgb)
 917                                 c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
 918                         break;
 919                 }
 920                 break;
 921
 922         default:
 923                 /* YCbCr pixel encoding */
 924                 c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
 925                 switch (avi->colorimetry) {
 926                 case HDMI_COLORIMETRY_NONE:
 927                         if (!is_ce)
 928                                 break;
 929                         if (is_sdtv) {
 930                                 c.colorspace = V4L2_COLORSPACE_SMPTE170M;
 931                                 c.ycbcr_enc = V4L2_YCBCR_ENC_601;
 932                         } else {
 933                                 c.colorspace = V4L2_COLORSPACE_REC709;
 934                                 c.ycbcr_enc = V4L2_YCBCR_ENC_709;
 935                         }
 936                         c.xfer_func = V4L2_XFER_FUNC_709;
 937                         break;
 938                 case HDMI_COLORIMETRY_ITU_601:
 939                         c.colorspace = V4L2_COLORSPACE_SMPTE170M;
 940                         c.ycbcr_enc = V4L2_YCBCR_ENC_601;
 941                         c.xfer_func = V4L2_XFER_FUNC_709;
 942                         break;
 943                 case HDMI_COLORIMETRY_ITU_709:
 944                         c.colorspace = V4L2_COLORSPACE_REC709;
 945                         c.ycbcr_enc = V4L2_YCBCR_ENC_709;
 946                         c.xfer_func = V4L2_XFER_FUNC_709;
 947                         break;
 948                 case HDMI_COLORIMETRY_EXTENDED:
 949                         switch (avi->extended_colorimetry) {
 950                         case HDMI_EXTENDED_COLORIMETRY_XV_YCC_601:
 951                                 c.colorspace = V4L2_COLORSPACE_REC709;
 952                                 c.ycbcr_enc = V4L2_YCBCR_ENC_XV709;
 953                                 c.xfer_func = V4L2_XFER_FUNC_709;
 954                                 break;
 955                         case HDMI_EXTENDED_COLORIMETRY_XV_YCC_709:
 956                                 c.colorspace = V4L2_COLORSPACE_REC709;
 957                                 c.ycbcr_enc = V4L2_YCBCR_ENC_XV601;
 958                                 c.xfer_func = V4L2_XFER_FUNC_709;
 959                                 break;
 960                         case HDMI_EXTENDED_COLORIMETRY_S_YCC_601:
 961                                 c.colorspace = V4L2_COLORSPACE_SRGB;
 962                                 c.ycbcr_enc = V4L2_YCBCR_ENC_601;
 963                                 c.xfer_func = V4L2_XFER_FUNC_SRGB;
 964                                 break;
 965                         case HDMI_EXTENDED_COLORIMETRY_OPYCC_601:
 966                                 c.colorspace = V4L2_COLORSPACE_OPRGB;
 967                                 c.ycbcr_enc = V4L2_YCBCR_ENC_601;
 968                                 c.xfer_func = V4L2_XFER_FUNC_OPRGB;
 969                                 break;
 970                         case HDMI_EXTENDED_COLORIMETRY_BT2020:
 971                                 c.colorspace = V4L2_COLORSPACE_BT2020;
 972                                 c.ycbcr_enc = V4L2_YCBCR_ENC_BT2020;
 973                                 c.xfer_func = V4L2_XFER_FUNC_709;
 974                                 break;
 975                         case HDMI_EXTENDED_COLORIMETRY_BT2020_CONST_LUM:
 976                                 c.colorspace = V4L2_COLORSPACE_BT2020;
 977                                 c.ycbcr_enc = V4L2_YCBCR_ENC_BT2020_CONST_LUM;
 978                                 c.xfer_func = V4L2_XFER_FUNC_709;
 979                                 break;
 980                         default: /* fall back to ITU_709 */
 981                                 c.colorspace = V4L2_COLORSPACE_REC709;
 982                                 c.ycbcr_enc = V4L2_YCBCR_ENC_709;
 983                                 c.xfer_func = V4L2_XFER_FUNC_709;
 984                                 break;
 985                         }
 986                         break;
 987                 default:
 988                         break;
 989                 }
 990                 /*
 991                  * YCC Quantization Range signaling is more-or-less broken,
 992                  * let's just ignore this.
 993                  */
 994                 break;
 995         }
 996         return c;
 997 }
 998 EXPORT_SYMBOL_GPL(v4l2_hdmi_rx_colorimetry);
 999
1000 /**
1001  * v4l2_get_edid_phys_addr() - find and return the physical address
1002  *
1003  * @edid:       pointer to the EDID data
1004  * @size:       size in bytes of the EDID data
1005  * @offset:     If not %NULL then the location of the physical address
1006  *              bytes in the EDID will be returned here. This is set to 0
1007  *              if there is no physical address found.
1008  *
1009  * Return: the physical address or CEC_PHYS_ADDR_INVALID if there is none.
1010  */
1011 u16 v4l2_get_edid_phys_addr(const u8 *edid, unsigned int size,
1012                             unsigned int *offset)
1013 {
1014         unsigned int loc = cec_get_edid_spa_location(edid, size);
1015
1016         if (offset)
1017                 *offset = loc;
1018         if (loc == 0)
1019                 return CEC_PHYS_ADDR_INVALID;
1020         return (edid[loc] << 8) | edid[loc + 1];
1021 }
1022 EXPORT_SYMBOL_GPL(v4l2_get_edid_phys_addr);
1023
1024 /**
1025  * v4l2_set_edid_phys_addr() - find and set the physical address
1026  *
1027  * @edid:       pointer to the EDID data
1028  * @size:       size in bytes of the EDID data
1029  * @phys_addr:  the new physical address
1030  *
1031  * This function finds the location of the physical address in the EDID
1032  * and fills in the given physical address and updates the checksum
1033  * at the end of the EDID block. It does nothing if the EDID doesn't
1034  * contain a physical address.
1035  */
1036 void v4l2_set_edid_phys_addr(u8 *edid, unsigned int size, u16 phys_addr)
1037 {
1038         unsigned int loc = cec_get_edid_spa_location(edid, size);
1039         u8 sum = 0;
1040         unsigned int i;
1041
1042         if (loc == 0)
1043                 return;
1044         edid[loc] = phys_addr >> 8;
1045         edid[loc + 1] = phys_addr & 0xff;
1046         loc &= ~0x7f;
1047
1048         /* update the checksum */
1049         for (i = loc; i < loc + 127; i++)
1050                 sum += edid[i];
1051         edid[i] = 256 - sum;
1052 }
1053 EXPORT_SYMBOL_GPL(v4l2_set_edid_phys_addr);
1054
1055 /**
1056  * v4l2_phys_addr_for_input() - calculate the PA for an input
1057  *
1058  * @phys_addr:  the physical address of the parent
1059  * @input:      the number of the input port, must be between 1 and 15
1060  *
1061  * This function calculates a new physical address based on the input
1062  * port number. For example:
1063  *
1064  * PA = 0.0.0.0 and input = 2 becomes 2.0.0.0
1065  *
1066  * PA = 3.0.0.0 and input = 1 becomes 3.1.0.0
1067  *
1068  * PA = 3.2.1.0 and input = 5 becomes 3.2.1.5
1069  *
1070  * PA = 3.2.1.3 and input = 5 becomes f.f.f.f since it maxed out the depth.
1071  *
1072  * Return: the new physical address or CEC_PHYS_ADDR_INVALID.
1073  */
1074 u16 v4l2_phys_addr_for_input(u16 phys_addr, u8 input)
1075 {
1076         /* Check if input is sane */
1077         if (WARN_ON(input == 0 || input > 0xf))
1078                 return CEC_PHYS_ADDR_INVALID;
1079
1080         if (phys_addr == 0)
1081                 return input << 12;
1082
1083         if ((phys_addr & 0x0fff) == 0)
1084                 return phys_addr | (input << 8);
1085
1086         if ((phys_addr & 0x00ff) == 0)
1087                 return phys_addr | (input << 4);
1088
1089         if ((phys_addr & 0x000f) == 0)
1090                 return phys_addr | input;
1091
1092         /*
1093          * All nibbles are used so no valid physical addresses can be assigned
1094          * to the input.
1095          */
1096         return CEC_PHYS_ADDR_INVALID;
1097 }
1098 EXPORT_SYMBOL_GPL(v4l2_phys_addr_for_input);
1099
1100 /**
1101  * v4l2_phys_addr_validate() - validate a physical address from an EDID
1102  *
1103  * @phys_addr:  the physical address to validate
1104  * @parent:     if not %NULL, then this is filled with the parents PA.
1105  * @port:       if not %NULL, then this is filled with the input port.
1106  *
1107  * This validates a physical address as read from an EDID. If the
1108  * PA is invalid (such as 1.0.1.0 since '0' is only allowed at the end),
1109  * then it will return -EINVAL.
1110  *
1111  * The parent PA is passed into %parent and the input port is passed into
1112  * %port. For example:
1113  *
1114  * PA = 0.0.0.0: has parent 0.0.0.0 and input port 0.
1115  *
1116  * PA = 1.0.0.0: has parent 0.0.0.0 and input port 1.
1117  *
1118  * PA = 3.2.0.0: has parent 3.0.0.0 and input port 2.
1119  *
1120  * PA = f.f.f.f: has parent f.f.f.f and input port 0.
1121  *
1122  * Return: 0 if the PA is valid, -EINVAL if not.
1123  */
1124 int v4l2_phys_addr_validate(u16 phys_addr, u16 *parent, u16 *port)
1125 {
1126         int i;
1127
1128         if (parent)
1129                 *parent = phys_addr;
1130         if (port)
1131                 *port = 0;
1132         if (phys_addr == CEC_PHYS_ADDR_INVALID)
1133                 return 0;
1134         for (i = 0; i < 16; i += 4)
1135                 if (phys_addr & (0xf << i))
1136                         break;
1137         if (i == 16)
1138                 return 0;
1139         if (parent)
1140                 *parent = phys_addr & (0xfff0 << i);
1141         if (port)
1142                 *port = (phys_addr >> i) & 0xf;
1143         for (i += 4; i < 16; i += 4)
1144                 if ((phys_addr & (0xf << i)) == 0)
1145                         return -EINVAL;
1146         return 0;
1147 }
1148 EXPORT_SYMBOL_GPL(v4l2_phys_addr_validate);