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